技术交流 › 金属材料论坛 › 多种注塑塑料性能分析（一）

HEATS 发表于 2010-9-12 16:34:49

多种注塑塑料性能分析（一）

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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.1pt; mso-char-indent-count: 2.0"><FONT size=2><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">1.ABS</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">丙烯腈<SPAN lang=EN-US>-</SPAN>丁二烯<SPAN lang=EN-US>-</SPAN>苯乙烯共聚物<SPAN lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></SPAN></B></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>典型应用范围<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>汽车<SPAN lang=EN-US>(</SPAN>仪表板，工具舱门，车轮盖，反光镜盒等<SPAN lang=EN-US>)</SPAN>，电冰箱，大强度工具<SPAN lang=EN-US>(</SPAN>头发烘干机，搅拌器，食品加工机，割草机等<SPAN lang=EN-US>)</SPAN>，电话机壳体，打字机键盘，娱乐用车辆如高尔夫球手推车以及喷气式雪撬车等。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注塑模工艺条件<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>干燥处理：<SPAN lang=EN-US>ABS</SPAN>材料具有吸湿性，要求在加工之前进行干燥处理。建议干燥条件为<SPAN lang=EN-US>80</SPAN>～<SPAN lang=EN-US>90</SPAN>℃下最少干燥<SPAN lang=EN-US>2</SPAN>小时。材料温度应保证小于<SPAN lang=EN-US>0.1%</SPAN>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>熔化温度：<SPAN lang=EN-US>210</SPAN>～<SPAN lang=EN-US>280</SPAN>℃；建议温度：<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="245" UnitName="℃"><SPAN lang=EN-US>245</SPAN>℃</st1:chmetcnv>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>模具温度：<SPAN lang=EN-US>25</SPAN>～<SPAN lang=EN-US>70</SPAN>℃。<SPAN lang=EN-US>(</SPAN>模具温度将影响塑件光洁度，温度较低则导致光洁度较低<SPAN lang=EN-US>)</SPAN>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注射压力：<SPAN lang=EN-US>500</SPAN>～<SPAN lang=EN-US>1000bar</SPAN>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注射速度：中高速度。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>化学和物理特性<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><FONT size=2><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">ABS</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">是由丙烯腈、丁二烯和苯乙烯三种化学单体合成。每种单体都具有不同特性：丙烯腈有高强度、热稳定性及化学稳定性；丁二烯具有坚韧性、抗冲击特性；苯乙烯具有易加工、高光洁度及高强度。从形态上看，<SPAN lang=EN-US>ABS</SPAN>是非结晶性材料。三种单体的聚合产生了具有两相的三元共聚物，一个是苯乙烯<SPAN lang=EN-US>-</SPAN>丙烯腈的连续相，另一个是聚丁二烯橡胶分散相。<SPAN lang=EN-US>ABS</SPAN>的特性主要取决于三种单体的比率以及两相中的分子结构。这就可以在产品设计上具有很大的灵活性，并且由此产生了市场上百种不同品质的<SPAN lang=EN-US>ABS</SPAN>材料。这些不同品质的材料提供了不同的特性，例如从中等到高等的抗冲击性，从低到高的光洁度和高温扭曲特性等。<SPAN lang=EN-US>ABS</SPAN>材料具有超强的易加工性，外观特性，低蠕变性和优异的尺寸稳定性以及很高的抗冲击强度。<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.1pt; mso-char-indent-count: 2.0"><FONT size=2><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">2.PA6</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">聚酰胺<SPAN lang=EN-US>6</SPAN>或尼龙<SPAN lang=EN-US>6<o:p></o:p></SPAN></SPAN></B></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>典型应用范围<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>由于有很好的机械强度和刚度被广泛用于结构部件。由于有很好的耐磨损特性，还用于制造轴承。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注塑模工艺条件<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>干燥处理：由于<SPAN lang=EN-US>PA6</SPAN>很容易吸收水分，因此加工前的干燥特别要注意。如果材料是用防水材料包装供应的，则容器应保持密闭。如果湿度大于<SPAN lang=EN-US>0.2%</SPAN>，建议在<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="80" UnitName="℃"><SPAN lang=EN-US>80</SPAN>℃</st1:chmetcnv>以上的热空气中干燥<SPAN lang=EN-US>16</SPAN>小时。如果材料已经在空气中暴露超过<SPAN lang=EN-US>8</SPAN>小时，建议进行<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="105" UnitName="℃"><SPAN lang=EN-US>105</SPAN>℃</st1:chmetcnv>，<SPAN lang=EN-US>8</SPAN>小时以上的真空烘干。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>熔化温度：<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>230~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="280" UnitName="℃">280<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>，对于增强品种为250~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="280" UnitName="℃">280<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>。<o:p></o:p></SPAN></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>模具温度：<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><FONT size=2><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">80~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="90" UnitName="℃">90<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>。模具温度很显著地影响结晶度，而结晶度又影响着塑件的机械特性。对于结构部件来说结晶度很重要，因此建议模具温度为80~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="90" UnitName="℃">90<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>。对于薄壁的，流程较长的塑件也建议施用较高的模具温度。增大模具温度可以提高塑件的强<SPAN lang=EN-US>度和刚度，但却降低了韧性。如果壁厚大于<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="3" UnitName="mm">3mm</st1:chmetcnv></SPAN></SPAN></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">，建议使用<SPAN lang=EN-US>20~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="40" UnitName="℃">40<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>的低温模具。对于玻璃增强材料模具温度应大于<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="80" UnitName="℃">80<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>。<o:p></o:p></SPAN></SPAN></SPAN></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注射压力：<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>一般在<SPAN lang=EN-US>750~1250bar</SPAN>之间<SPAN lang=EN-US>(</SPAN>取决于材料和产品设计<SPAN lang=EN-US>)</SPAN>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注射速度：<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>高速<SPAN lang=EN-US>(</SPAN>对增强型材料要稍微降低<SPAN lang=EN-US>)</SPAN>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>流道和浇口<SPAN lang=EN-US>:</SPAN>由于<SPAN lang=EN-US>PA6</SPAN>的凝固时间很短，因此浇口的位置非常重要。浇口孔径不要小于<SPAN lang=EN-US>0.5*t(</SPAN>这里<SPAN lang=EN-US>t</SPAN>为塑件厚度<SPAN lang=EN-US>)</SPAN>。如果使用热流道，浇口尺寸应比使用常规流道小一些，因为热流道能够帮助阻止材料过早凝固。如果用潜入式浇口，浇口的最小直径应当是<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue=".75" UnitName="mm"><SPAN lang=EN-US>0.75mm</SPAN></st1:chmetcnv>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>化学和物理特性<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><FONT size=2><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PA6</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">的化学物理特性和<SPAN lang=EN-US>PA66</SPAN>很相似，然而，它的熔点较低，而且工艺温度范围很宽。它的抗冲击性和抗溶解性比<SPAN lang=EN-US>PA66</SPAN>要好<SPAN lang=EN-US>,</SPAN>但吸湿性也更强。因为塑件的许多品质特性都要受到吸湿性的影响，因此使用<SPAN lang=EN-US>PA6</SPAN>设计产品时要充分考虑到这一点。为了提高<SPAN lang=EN-US>PA6</SPAN>的机械特性，经常加入各种各样的改性剂。玻璃就是最常见的添加剂，有时为了提高抗冲击性还加入合成橡胶，如<SPAN lang=EN-US>EPDM</SPAN>和<SPAN lang=EN-US>SBR</SPAN>等。对于没有添加剂的产品，<SPAN lang=EN-US>PA6</SPAN>的收缩率在<SPAN lang=EN-US>1%</SPAN>到<SPAN lang=EN-US>1.5%</SPAN>之间。加入玻璃纤维添加剂可以使收缩率降低到<SPAN lang=EN-US>0.3%(</SPAN>但和流程相垂直的方向还要稍高一些<SPAN lang=EN-US>)</SPAN>。成型组装的收缩率主要受材料结晶度和吸湿性影响。实际的收缩率还和塑件设计、壁厚及其它工艺参数成函数关系。<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.1pt; mso-char-indent-count: 2.0"><FONT size=2><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">3.PA12</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">聚酰胺<SPAN lang=EN-US>12</SPAN>或尼龙<SPAN lang=EN-US>12<o:p></o:p></SPAN></SPAN></B></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>典型应用范围<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>水量表和其他商业设备，电缆套，机械凸轮，滑动机构以及轴承等。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注塑模工艺条件<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>干燥处理：加工之前应保证湿度在<SPAN lang=EN-US>0.1%</SPAN>以下。如果材料是暴露在空气中储存，建议要在<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="85" UnitName="℃"><SPAN lang=EN-US>85</SPAN>℃</st1:chmetcnv>热空气中干燥<SPAN lang=EN-US>4~5</SPAN>小时。如果材料是在密闭容器中储存，那么经过<SPAN lang=EN-US>3</SPAN>小时温度平衡即可直接使用。 熔化温度：<SPAN lang=EN-US>240~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="300" UnitName="℃">300<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>；对于普通特性材料不要超过<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="310" UnitName="℃">310<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>，对于有阻燃特性材料不要超过<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="270" UnitName="℃">270<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>。<o:p></o:p></SPAN></SPAN></SPAN></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>模具温度：对于未增强型材料为<SPAN lang=EN-US>30~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="40" UnitName="℃">40<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>，对于薄壁或大面积元件为80~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="90" UnitName="℃">90<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>，对于增强型材料为90~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="100" UnitName="℃">100<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>。增加温度将增加材料的结晶度。精确地控制模具温度对PA12</SPAN></SPAN></SPAN></SPAN>来说是很重要的。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注射压力：最大可到<SPAN lang=EN-US>1000bar(</SPAN>建议使用低保压压力和高熔化温度<SPAN lang=EN-US>)</SPAN>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注射速度：高速<SPAN lang=EN-US>(</SPAN>对于有玻璃添加剂的材料更好些<SPAN lang=EN-US>)</SPAN>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>流道和浇口：对于未加添加剂的材料，由于材料粘性较低，流道直径应在<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="30" UnitName="mm"><SPAN lang=EN-US>30mm</SPAN></st1:chmetcnv>左右。对于增强型材料要求<SPAN lang=EN-US>5~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="8" UnitName="mm">8mm</st1:chmetcnv></SPAN>的大流道直径。流道形状应当全部为圆形。注入口应尽可能的短。可以使用多种形式的浇口。大型塑件不要使用小浇口，这是为了避免对塑件过高的压力或过大的收缩率。浇口厚度最好和塑件厚度相等。如果使用潜入式浇口，建议最小的直径为<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue=".8" UnitName="mm"><SPAN lang=EN-US>0.8mm</SPAN></st1:chmetcnv>。热流道模具很有效，但是要求温度控制很精确以防止材料在喷嘴处渗漏或凝固。如果使用热流道，浇口尺寸应当比冷流道要小一些。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>化学和物理特性<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><FONT size=2><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PA12</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">是从丁二烯线性，半结晶<SPAN lang=EN-US>-</SPAN>结晶热塑性材料。它的特性和<SPAN lang=EN-US>PA11</SPAN>相似，但晶体结构不同。<SPAN lang=EN-US>PA12</SPAN>是很好的电气绝缘体并且和其它聚酰胺一样不会因潮湿影响绝缘性能。它有很好的抗冲击性机化学稳定性。<SPAN lang=EN-US>PA12</SPAN>有许多在塑化特性和增强特性方面的改良品种。和<SPAN lang=EN-US>PA6</SPAN>及<SPAN lang=EN-US>PA66</SPAN>相比，这些材料有较低的熔点和密度，具有非常高的回潮率。<SPAN lang=EN-US>PA12</SPAN>对强氧化性酸无抵抗能力。<SPAN lang=EN-US>PA12</SPAN>的粘性主要取决于湿度、温度和储藏时间。它的流动性很好。收缩率在<SPAN lang=EN-US>0.5%</SPAN>到<SPAN lang=EN-US>2%</SPAN>之间，这主要取决于材料品种、壁厚及其它工艺条件。<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.1pt; mso-char-indent-count: 2.0"><FONT size=2><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">4.PA66</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">聚酰胺<SPAN lang=EN-US>66</SPAN>或尼龙<SPAN lang=EN-US>66<o:p></o:p></SPAN></SPAN></B></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>典型应用范围<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>同<SPAN lang=EN-US>PA6</SPAN>相比，<SPAN lang=EN-US>PA66</SPAN>更广泛应用于汽车工业、仪器壳体以及其它需要有抗冲击性和高强度要求的产品。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注塑模工艺条件<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>干燥处理：如果加工前材料是密封的，那么就没有必要干燥。然而，如果储存容器被打开，那么建议在<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="85" UnitName="℃"><SPAN lang=EN-US>85</SPAN>℃</st1:chmetcnv>的热空气中干燥处理。如果湿度大于<SPAN lang=EN-US>0.2%</SPAN>，还需要进行<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="105" UnitName="℃"><SPAN lang=EN-US>105</SPAN>℃</st1:chmetcnv>，<SPAN lang=EN-US>12</SPAN>小时的真空干燥。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>熔化温度：<SPAN lang=EN-US>260~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="290" UnitName="℃">290<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>。对玻璃添加剂的产品为275~<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="280" UnitName="℃">280<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>。熔化温度应避免高于<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="300" UnitName="℃">300<SPAN lang=EN-US><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv><SPAN lang=EN-US>。<o:p></o:p></SPAN></SPAN></SPAN></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>模具温度：建议<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="80" UnitName="℃"><SPAN lang=EN-US>80</SPAN>℃</st1:chmetcnv>。模具温度将影响结晶度，而结晶度将影响产品的物理特性。对于薄壁塑件，如果使用低于<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="40" UnitName="℃"><SPAN lang=EN-US>40</SPAN>℃</st1:chmetcnv>的模具温度，则塑件的结晶度将随着时间而变化，为了保持塑件的几何稳定性，需要进行退火处理。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注射压力：通常在<SPAN lang=EN-US>750~1250bar</SPAN>，取决于材料和产品设计。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>注射速度：高速<SPAN lang=EN-US>(</SPAN>对于增强型材料应稍低一些<SPAN lang=EN-US>)</SPAN>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>流道和浇口<SPAN lang=EN-US>:</SPAN>由于<SPAN lang=EN-US>PA66</SPAN>的凝固时间很短，因此浇口的位置非常重要。浇口孔径不要小于<SPAN lang=EN-US>0.5*t(</SPAN>这里<SPAN lang=EN-US>t</SPAN>为塑件厚度<SPAN lang=EN-US>)</SPAN>。如果使用热流道，浇口尺寸应比使用常规流道小一些，因为热流道能够帮助阻止材料过早凝固。如果用潜入式浇口，浇口的最小直径应当是<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue=".75" UnitName="mm"><SPAN lang=EN-US>0.75mm</SPAN></st1:chmetcnv>。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><FONT size=2>化学和物理特性<SPAN lang=EN-US>:<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><FONT size=2><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PA66</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">在聚酰胺材料中有较高的熔点。它是一种半晶体<SPAN lang=EN-US>-</SPAN>晶体材料。<SPAN lang=EN-US>PA66</SPAN>在较高温度也能保持较强的强度和刚度。<SPAN lang=EN-US>PA66</SPAN>在成型后仍然具有吸湿性，其程度主要取决于材料的组成、壁厚以及环境条件。在产品设计时，一定要考虑吸湿性对几何稳定性的影响。为了提高<SPAN lang=EN-US>PA66</SPAN>的机械特性，经常加入各种各样的改性剂。玻璃就是最常见的添加剂，有时为了提高抗冲击性还加入合成橡胶，如<SPAN lang=EN-US>EPDM</SPAN>和<SPAN lang=EN-US>SBR</SPAN>等。<SPAN lang=EN-US>PA66</SPAN>的粘性较低，因此流动性很好<SPAN lang=EN-US>(</SPAN>但不如<SPAN lang=EN-US>PA6)</SPAN>。这个性质可以用来加工很薄的元件。它的粘度对温度变化很敏感。<SPAN lang=EN-US>PA66</SPAN>的收缩率在<SPAN lang=EN-US>1%~2%</SPAN>之间，加入玻璃纤维添加剂可以将收缩率降低到<SPAN lang=EN-US>0.2%~1%</SPAN>。收缩率在流程方向和与流程方向相垂直方向上的相异是较大的。<SPAN lang=EN-US>PA66</SPAN>对许多溶剂具有抗溶性，但对酸和其它一些氯化剂的抵抗力较弱。<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p><FONT size=2>&nbsp;</FONT></o:p></SPAN></P>
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