CN106519442A - 一种聚丙烯注塑发泡方法 - Google Patents

一种聚丙烯注塑发泡方法 Download PDF

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CN106519442A
CN106519442A CN201610989390.9A CN201610989390A CN106519442A CN 106519442 A CN106519442 A CN 106519442A CN 201610989390 A CN201610989390 A CN 201610989390A CN 106519442 A CN106519442 A CN 106519442A
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polypropylene
foaming
temperature
masterbatch
injection molding
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张达明
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Wuxi Mingsheng Strong Blower Co Ltd
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Abstract

本发明公开了一种聚丙烯注塑发泡方法，包括：(1)将偶氮二甲酰胺、ZnO和硬脂酸锌混合均匀，得到复合发泡剂；(2)将复合发泡剂与低密度聚乙烯按照质量比7:3～8:2混合均匀，在同向双螺杆挤出机上挤出造粒，得到发泡母粒；(3)将复合发泡剂、发泡母粒与聚丙烯树脂以(2‑5):(5‑10):100的重量比混合均匀，以注塑成型工艺制备发泡聚丙烯。本发明采用发泡母粒制备发泡聚丙烯，聚丙烯先熔融，随后母粒中的偶氮二甲酰胺在熔融的聚丙烯中分散均匀，分解形成泡核并长大定型为泡孔，从而制得聚烯烃制品中发泡均匀，孔径大小一致。

Description

一种聚丙烯注塑发泡方法
技术领域
本发明涉及发泡技术领域，尤其涉及一种聚丙烯注塑发泡方法。
背景技术
聚合物发泡材料是指以聚合物为基础而其内部具有无数泡孔的材料，也可以视为以气体为填料的复合材料。其具有密度低、隔热隔音性能好、比强度高等特点。在家庭日用品、交通工具、绝缘材料、包装材料、阻燃材料、电器、运动设施、电子产品等行业被广泛应用。高性能的发泡材料则在军事、航空航天等尖端领域发挥重要作用。
自20世纪70年代以来，作为仅次于PE和聚氯乙烯(PVC)的第三大通用塑料聚丙烯(PP)逐渐进入了发泡研究者的视野，PP发泡材料不仅具有许多优异的性能，而且可回收再利用，在自然环境下可降解。
利用其优良的耐热性、卫生性、热绝缘性和良好的环境效应，PP发泡材料可在包装、汽车、绝缘、建筑等领域发挥重要作用，并且具有取代其它发泡材料的趋势。因此，近年来许多国家大力发展PP发泡材料，但是，由于PP是一种半结晶性聚合物，可以发泡的温度区间(统称发泡温度区间)窄，仅为4℃，发泡难度大。
发明内容
本发明的目的在于提出一种聚丙烯注塑发泡方法，能够使得系聚丙烯发泡效果良好，孔径均匀。
为达此目的，本发明采用以下技术方案：
一种聚丙烯注塑发泡方法，包括：
(1)将偶氮二甲酰胺、ZnO和硬脂酸锌于100-120℃下干燥，然后将其按照质量比1:(0.08-0.3):(0.01-0.05)混合均匀，得到复合发泡剂；
(2)将复合发泡剂与低密度聚乙烯按照质量比7:3～8:2混合均匀，在同向双螺杆挤出机上挤出造粒，得到发泡母粒；螺杆I段温度为110℃，II和III段为120℃，IV段为125℃，机头温度为120℃，熔体温度为110℃；
(3)将复合发泡剂、发泡母粒与聚丙烯树脂以(2-5):(5-10):100的重量比混合均匀，以注塑成型工艺制备发泡聚丙烯，其熔体温度为185-195℃，模具温度为60-70℃，注塑压力为68-75MPa，保压压力为80-85MPa，注射速度为58-65g/s，冷却时间为20-30min。
本发明采用发泡母粒制备发泡聚丙烯，聚丙烯先熔融，随后母粒中的偶氮二甲酰胺在熔融的聚丙烯中分散均匀，分解形成泡核并长大定型为泡孔，从而制得聚烯烃制品中发泡均匀，孔径大小一致。
具体实施方式
下面通过具体实施方式来进一步说明本发明的技术方案。
实施例1
一种聚丙烯注塑发泡方法，包括：
(1)将偶氮二甲酰胺、ZnO和硬脂酸锌于100℃下干燥，然后将其按照质量比1:0.08:0.01混合均匀，得到复合发泡剂；
(2)将复合发泡剂与低密度聚乙烯按照质量比7:3混合均匀，在同向双螺杆挤出机上挤出造粒，得到发泡母粒；螺杆I段温度为110℃，II和III段为120℃，IV段为125℃，机头温度为120℃，熔体温度为110℃；
(3)将复合发泡剂、发泡母粒与聚丙烯树脂以2:5:100的重量比混合均匀，以注塑成型工艺制备发泡聚丙烯，其熔体温度为185℃，模具温度为60℃，注塑压力为68MPa，保压压力为80MPa，注射速度为58g/s，冷却时间为20min。
实施例2
一种聚丙烯注塑发泡方法，包括：
(1)将偶氮二甲酰胺、ZnO和硬脂酸锌于120℃下干燥，然后将其按照质量比1:0.3:0.05混合均匀，得到复合发泡剂；
(2)将复合发泡剂与低密度聚乙烯按照质量比8:2混合均匀，在同向双螺杆挤出机上挤出造粒，得到发泡母粒；螺杆I段温度为110℃，II和III段为120℃，IV段为125℃，机头温度为120℃，熔体温度为110℃；
(3)将复合发泡剂、发泡母粒与聚丙烯树脂以5:10:100的重量比混合均匀，以注塑成型工艺制备发泡聚丙烯，其熔体温度为195℃，模具温度为70℃，注塑压力为75MPa，保压压力为85MPa，注射速度为65g/s，冷却时间为30min。
实施例3
一种聚丙烯注塑发泡方法，包括：
(1)将偶氮二甲酰胺、ZnO和硬脂酸锌于110℃下干燥，然后将其按照质量比1:0.1:0.03混合均匀，得到复合发泡剂；
(2)将复合发泡剂与低密度聚乙烯按照质量比7:3混合均匀，在同向双螺杆挤出机上挤出造粒，得到发泡母粒；螺杆I段温度为110℃，II和III段为120℃，IV段为125℃，机头温度为120℃，熔体温度为110℃；
(3)将复合发泡剂、发泡母粒与聚丙烯树脂以3:8:100的重量比混合均匀，以注塑成型工艺制备发泡聚丙烯，其熔体温度为190℃，模具温度为65℃，注塑压力为70MPa，保压压力为80MPa，注射速度为60g/s，冷却时间为20min。
实施例1-3采用发泡母粒制备发泡聚丙烯，聚丙烯先熔融，随后母粒中的偶氮二甲酰胺在熔融的聚丙烯中分散均匀，分解形成泡核并长大定型为泡孔，从而制得聚烯烃制品中发泡均匀，孔径大小一致。

Claims (1)

1.一种聚丙烯注塑发泡方法，包括：
(1)将偶氮二甲酰胺、ZnO和硬脂酸锌于100-120℃下干燥，然后将其按照质量比1:(0.08-0.3):(0.01-0.05)混合均匀，得到复合发泡剂；
(2)将复合发泡剂与低密度聚乙烯按照质量比7:3～8:2混合均匀，在同向双螺杆挤出机上挤出造粒，得到发泡母粒；螺杆I段温度为110℃，II和III段为120℃，IV段为125℃，机头温度为120℃，熔体温度为110℃；
(3)将复合发泡剂、发泡母粒与聚丙烯树脂以(2-5):(5-10):100的重量比混合均匀，以注塑成型工艺制备发泡聚丙烯，其熔体温度为185-195℃，模具温度为60-70℃，注塑压力为68-75MPa，保压压力为80-85MPa，注射速度为58-65g/s，冷却时间为20-30min。
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CN107141781A (zh) * 2017-06-06 2017-09-08 常州大学 一种ldpe/pa6共混发泡材料及其制备方法
PL422891A1 (pl) * 2017-09-15 2019-03-25 Ust-M Spółka Z Ograniczoną Odpowiedzialnością Sposób wytwarzania antybakteryjnych korpusów filtrów zwłaszcza do filtrowania wody

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CN101560307A (zh) * 2009-05-19 2009-10-21 四川大学 二步挤出成型制备低密度聚丙烯泡沫型材或珠粒的方法
CN102888015A (zh) * 2011-07-21 2013-01-23 中国石油化工股份有限公司 一种复合发泡剂及用其制备的聚丙烯发泡材料

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CN101560307A (zh) * 2009-05-19 2009-10-21 四川大学 二步挤出成型制备低密度聚丙烯泡沫型材或珠粒的方法
CN102888015A (zh) * 2011-07-21 2013-01-23 中国石油化工股份有限公司 一种复合发泡剂及用其制备的聚丙烯发泡材料

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107141781A (zh) * 2017-06-06 2017-09-08 常州大学 一种ldpe/pa6共混发泡材料及其制备方法
PL422891A1 (pl) * 2017-09-15 2019-03-25 Ust-M Spółka Z Ograniczoną Odpowiedzialnością Sposób wytwarzania antybakteryjnych korpusów filtrów zwłaszcza do filtrowania wody

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