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src="/homes/images3/laifang.gif" align="absmiddle" width="20"></td> <td class="title">最q来?/td> <td width="50" ></td> </tr> </table> </td> </tr> <tr><td height="200" valign="top" align="center"> </td></tr> </table> </td> </tr> <tr><td height="10"></td></tr> </table> </td> <td width="10"></td> <td width="742" valign="top" align="center"> <table width="742" border="0" cellspacing="0" cellpadding="0"> <tr> <td class="solid-rw"> <table width="742" border="0" cellspacing="0" cellpadding="0"> <tr> <td height="32" class="center_bg"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="56" align="center"><img src=/homes/images/yuanchuang.gif border=0></td> <td width="567" align="left"><span class="title">马宏利:谈慢回ҎvlŞ成机?/span>   <font color=#999999>(2020/2/4 9:48:07)</font></td> <td width="119" style="font-family:'宋体';"><img src="/space/images/zhuanlan.jpg" align="absmiddle"> <a href="/space/blog_post.asp" class="link3">发表博文</a></td> </tr> </table> </td> </tr> <tr><td height="" valign="top" align="center"> <table width="98%" border="0" cellspacing="0" cellpadding="0" align="left"> <tr> <td height="8"></td> </tr> <tr><td align="center" height="100" valign="top"> <table width="99%" border="0" cellspacing="0" cellpadding="0" align="center"> <tr><td class=red_2 align=left></td></tr> <tr> <td align="left"> <table width="98%" border="0" cellspacing="0" cellpadding="0" align="center"> <tr> <td class="style_14_666666"> <div class="f401" id="f401"><p> <strong class="faqe"> </strong><strong class="faqe"><span style="color:#E53333;font-size:14px;">本篇义堂108马宏利原创Q{载必M聚义堂取得联p,q标明文章出处!q者必IӞ<br /></span><br /><br /><span style="font-size:14px;"> <b>一、引?/b></span> </strong> </p><p> <br />慢回Ҏvl自2000q前后进入我国后Q无论技术提升还是原料供应,都得C长的发展。当q有许多企业抓住了机会,也获取了相当丰厚的利润。慢回弹L技术日益成熟了Q市场需求却江河日下Q慢回弹L已经不是热点产品了,同行的关注力也大大下降了Q关于慢回弹L技术的讨论也日渐减了。冷清之ӞW者抛个务虚短文,用以打发疫情D的百无聊赖?/p><p> <span style="font-size:14px;"> <br />二?/span><span style="font-size:14px;"><strong class="faqe">慢回Ҏvl늉?/strong> </span> </p><p> <br />慢回Ҏvl늚典型特征是Q当l它施加和撤销外力Ӟ其Ş变过E与复原轨迹不像普通那样几乎瞬时、同步响应。尤其是q原Ӟ它是从受力核心点的最外边~vQ由外向里逐步恢复Q受力核心点最后恢复完成。h们依据慢回弹L的这个特性,开发出了许多缓冲制品、垫材,工艺品?/p><p> <br />慢回Ҏvl늚q个Ҏ能把不规则形状物体施加l它的压力分散^均,因此有零压力l늚叫法。同Ӟq反弹力能保持外物压在L上Ş成的几何形状Q也才有记忆l늚别称?/p><p> <strong class="faqe"><span style="font-size:14px;"> <br />三、慢回弹L的Ş成机?/span> </strong> </p><p> <br />众所周知Qvl|p醚多元醇和异氰酸酯ؓLQ再d必要的助剂制成?/p><p> <br />一般情况下Q用分子量比较大的聚醚多元?譬如分子?000?000以上?和聚合物多元?分子?0000?000以上?与异氰酸酯反应,制得的是回弹速度较快的vl,业内UCؓ<strong class="faqe">普通</strong>?/p><p> <br />而制备慢回弹LӞ几乎都是把高分子量聚醚多元醇/聚合物多元醇与低分子量聚醚多元醇(譬如分子?00及分子量550)搭配使用?/p><p> <br />通常Q我们把分子?000?000以上的聚醚和分子量ؓ550?00的聚醚؜合在一P与异氰酸酯反应制?strong>慢回Ҏvl?/strong>。聚醚与异氰酔R反应后,׃形成分子量大不{的链段。我们把高分子量聚醚与异氰酸酯反应生的物质UCؓ<strong class="faqe">软段</strong>Q把低分子量聚醚与异氰酸酯反应生的物质UCؓ<strong class="faqe">段</strong>。这些链D通过化学键和物理键结合在一P既相互缠l、堆U,又因位阻效应产生d的相分离?/p><p> <span style="color:#009900;"><br /><span style="color:#009900;"> <span style="color:#666666;">大家知道Q?/span></span><span style="color:#009900;"><span style="color:#666666;">高分子量聚醚gQ与异氰酔R反应交联密度低,因而YD分子内、分子间zdI间大,形变和恢复容易,是?/span><strong class="faqe"><span style="color:#666666;">软段zd?/span></strong><span style="color:#666666;">。而低分子量聚醚羟值高Q与异氰酔R反应交联密度大,分子内、分子间zdI间,形变与恢复难度大Q即</span><strong class="faqe"><span style="color:#666666;">段zd?/span></strong><span style="color:#666666;">?br /></span><br /><strong class="faqe"> <span style="color:#E53333;">软硬D늚如上Ҏ,</span></strong></span><strong class="faqe"><span style="color:#E53333;">加上聚合物内部轻微的相分,使得慢回Ҏvl在施加外力和撤销外力的过E中Q表现出软段和硬DŞ变与恢复不同步的现象。究其原因,</span><span style="color:#E53333;">是软段形变与恢复速度快,段形变与恢复速度慢。这是慢回Ҏvl늚形成机理?/span></strong></span><span style="color:#9933E5;"><span style="color:#E53333;"> </span></span> </p><p> <span style="color:#9933E5;"><span style="color:#E53333;"> </span></span> </p><p> <strong class="faqe"><span style="color:#9933E5;"> 熟悉慢回Ҏvl配方的技术h员都知道指数一定时Q?/span></strong><a href="//www.wopnyc.com.cn/service/index.asp" target="_blank"><strong class="faqe"><span style="color:#9933E5;">慢回弹聚?/span></strong></a><strong class="faqe"><span style="color:#9933E5;">量越大,L回弹速度慢Q慢回弹聚醚量越,L回弹速度快Q原因就在于此?/span></strong><span style="color:#9933E5;"> </span> </p><p> <br /><strong class="faqe"><span style="font-size:14px;"> </span><span style="font-size:14px;">四、应?/span><span style="font-size:14px;"> </span></strong> </p><p> <strong class="faqe"> <span style="color:#99BB00;"> <br />明确慢回Ҏvl늚形成机理Q就可以Ҏ客户需要,设计出合理的配方。譬如,客户要求L回弹速度要快Q就适当减少慢回弹聚醚用量,增加普通聚醚用量;客户要求Lļ度要高Q可以通过增加慢回弹聚醚用量,用白Ҏ代部分普通聚醚,提高TDI指数的方法满_戯求?</span></strong> </p><p> <br />对于慢回Ҏvl容?strong><span style="color:#99BB00;">闭孔</span></strong>的问题,也可以根据慢回弹L形成机理来解冟?strong><span style="color:#99BB00;">一般vl密度越高,容易闭孔;TDI指数高Q越Ҏ闭孔?/span></strong><span style="color:#99BB00;"> </span> </p><p> <br />生<strong class="faqe"><span style="color:#99BB00;">高密度慢回弹L</span></strong>Ӟ大都用分子量550、羟?06的聚醚,此时交联密度增加Q链D늼l、堆U紧密,相分ȝ度轻Q硬D占d因素Q导致闭孔率高。同PTDI指数高时Q交联密度增加了Q硬D|集中了,闭孔的們֐增加了。遇到这L问题Q可以通过<strong class="faqe"><span style="color:#99BB00;">提高</span></strong><a href="//www.wopnyc.com.cn/job/" target="_blank"><strong class="faqe"><span style="color:#99BB00;">开孔剂</span></strong></a><strong class="faqe"><span style="color:#99BB00;">的用?/span></strong>来解冟?/p><p> <br /><em><strong class="faqe">未涉及到的,有机会再聊,Ƣ迎同行指正Q?/strong></em><br /><br /><br /><span style="color:#337FE5;font-size:12px;"> </span><span class="faqe"><span style="color:#337FE5;font-size:12px;"> </span><strong class="faqe"><span style="color:#337FE5;font-size:12px;">本文作者:马宏利,</span><span style="color:#337FE5;font-size:12px;">88q毕业于青岛U技大学q?/span><span style="color:#337FE5;font-size:12px;">留校LQ?/span></strong></span><span class="faqe"><strong class="faqe"><span style="color:#337FE5;font-size:12px;">从事聚}酯材料研发?7q前往q东Q从事有机硅Q印染助剂研发与生?4qv在广东,江 Q江苏从事慢回弹聚醚与开孔剂销售与技术服务,关于慢回弹,水U慢回弹Q自由高回弹,模塑慢回弹,模塑高回弹,胀气Q垂直{品生产方面的问题可与他联p,手机P13687636150</span><br /><br /><span style="color:#006600;font-size:14px;">马宏利Y泡技术系列文章相关链接:</span><br /></strong><a target="_blank"><span style="font-size:14px;">?/span><span style="font-size:14px;">?/span><span style="font-size:14px;">谈慢回弹开孔剂?/span></a><br /><a target="_blank"><span style="font-size:14px;"><span style="color:#000000;"> </span>?/span><span style="font-size:14px;">再谈慢回弹开孔剂?/span></a><br /><a target="_blank"><span style="font-size:14px;"><span style="color:#000000;"> </span>?/span><span style="font-size:14px;">慢回Ҏvl配方中料的用?/span></a><br /><a target="_blank"><span style="font-size:14px;"><span style="color:#000000;"> </span>?/span><span style="font-size:14px;">慢回Ҏvl配方设计简论?/span></a><br /><a target="_blank"><span style="font-size:14px;"><span style="color:#000000;"> </span>?/span><span style="font-size:14px;">慢回Ҏvl发泡设备与工艺杂谈?/span></a><span style="font-size:14px;"> </span></span> </p></div> </td></tr></table> </td> </tr> <tr><td height="15" align="center"></td></tr> <tr><td height="5"></td></tr> <tr><td height="15" ></td></tr> <tr><td height="15"></td></tr> <tr> <td height="22" class="gray_999999"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr align="left"> <td width="1%"></td> <td width="42%">分类Q?a target='_blank' href=/publog/blog_all.asp?type=3>软应用</a></td> <td width="21%"></td> <td width="17%">评论Q?font class="red_2"></font>?/td> <td width="19%">览Q?font class="red_2"></font>?/td> </tr> </table> </td> </tr> <tr> <td height="22" class="gray_999999"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr align="left"> <td width="1%"></td> <td width="42%">关键词:<a href=/publog/blog_search.asp?type=1&KeyWord=%C2%FD%BB%D8%B5%AF target=_blank><u>慢回?/U></a> <a href=/publog/blog_search.asp?type=1&KeyWord=%BA%A3%C3%E0 target=_blank><u>L</U></a> <a href=/publog/blog_search.asp?type=1&KeyWord=%BB%FA%C0%ED target=_blank><u>机理</U></a> </td> <td width="7%"></td> <td width="50%" colspan="2"></td> </tr> </table> </td> </tr> <tr> <td height="22" class="gray_999999"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr 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