CN101698352A - 一种硬弹性聚丙烯膜的制备方法 - Google Patents

一种硬弹性聚丙烯膜的制备方法 Download PDF

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CN101698352A
CN101698352A CN200910185311A CN200910185311A CN101698352A CN 101698352 A CN101698352 A CN 101698352A CN 200910185311 A CN200910185311 A CN 200910185311A CN 200910185311 A CN200910185311 A CN 200910185311A CN 101698352 A CN101698352 A CN 101698352A
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temperature
polypropylene film
preparation
hard elastic
film
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单卫忠
薛志刚
薛峰
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JIANGSU SHENLONG VENTURE GROUP CO Ltd
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JIANGSU SHENLONG VENTURE GROUP CO Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92923—Calibration, after-treatment or cooling zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92933—Conveying, transporting or storage of articles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

本发明涉及一种硬弹性聚丙烯膜的制备方法，其特征在于该方法包括如下步骤：将等规度≥96％、密度为0.9±0.05g/cm3的挤出级聚丙烯树脂，在180-250℃温度下经挤出机平模口缝隙挤出，模口缝隙宽度1.5-3.0mm，然后经牵伸辊拉伸，拉伸速度为20-40m/min，拉伸比为1∶100-300，再经冷却辊冷却，冷却辊温度30-110℃，将冷却后的薄膜在120-150℃温度下退火5-60min。本发明硬弹性聚丙烯膜的制备方法制得的硬弹性聚丙烯膜弹性回复率高，可达95％以上。

Description

一种硬弹性聚丙烯膜的制备方法
(一)技术领域
本发明涉及一种硬弹性聚丙烯膜的制备方法，属于高分子化学技术领域。
(二)背景技术
微孔膜位于锂离子电池正极与负极之间，是锂离子电池的重要组成部分。微孔膜的主要作用是隔离电池的正、负极，使电池内的电子不能自由穿过；但能够让电解质液中的离子在正负极间自由通过。
聚丙烯可通过高速挤出，然后在适当的温度下热处理而获得一种硬弹性材料。要获得具有硬弹性的聚合物材料，关键是使聚合物分子链高度取向，然后热处理，获得垂直于挤出方向而又平行排列的片晶结构(排状片晶结构)。一般来讲，对于同一聚合物，结晶度越高，弹性回复率越高，其形成的硬弹性程度越高。基膜的硬弹性决定拉伸法制备聚烯烃微孔膜的微孔结构。
现有的硬弹性聚丙烯膜的弹性回复率低，弹性回复率仅为90％左右，造成微孔膜制备的工艺复杂、设备投资高。
(三)发明内容
本发明的目的在于克服上述不足，提供一种弹性回复率高的微孔硬弹性聚丙烯膜的制备方法。
本发明的目的是这样实现的：一种硬弹性聚丙烯膜的制备方法，其特征在于该方法包括如下步骤：
将等规度≥96％、密度为0.9±0.05g/cm3的挤出级聚丙烯树脂，在180-250℃温度下经挤出机平模口缝隙挤出，模口缝隙宽度1.5-3mm，然后经拉伸辊拉伸，其拉伸速度为20-40m/min，拉伸比为1∶100-300倍，再经冷却辊冷却，冷却辊温度30-110℃，将冷却后的薄膜在120-150℃温度下退火5-60min，制得硬弹性聚丙烯膜。
本发明的关键点在于：通过增加聚丙烯熔体拉伸比、降低熔体温度，使硬弹性PP膜片α片晶的质量(数量、体积、排列)和结晶度改善，使弹性回复率增加，拉伸强度增大，断裂伸长率降低。然后经过拉伸与退火处理，增加硬弹性PP膜的取向度，使结晶更加完善，随着退火温度的升高和退火时间的延长，硬弹性PP膜的熔点升高、片晶厚度和结晶度逐渐增加，弹性回复率逐渐增大，从而得到弹性回复率(ER100)可达95％以上的硬弹性聚丙烯膜。
(四)具体实施方式
实施例1：
将等规度≥96％、密度为0.9±0.05g/cm3的挤出级聚丙烯树脂，在180-250℃温度下经挤出机平模口缝隙挤出，模口缝隙宽度1.5mm，然后经拉伸速度为20m/min，拉伸比为1∶100，再经冷却辊冷却，冷却辊温度100℃，将冷却后的薄膜在120℃温度下退火20min，制得弹性回复率为95％的硬弹性聚丙烯膜。
实施例2：
将等规度≥96％、密度为0.9±0.05g/cm3的挤出级聚丙烯树脂，在180-250℃温度下经挤出机平模口缝隙挤出，模口缝隙宽度1.8mm，然后经拉伸，拉伸速度为20m/min，拉伸比为1∶150，再经冷却辊冷却，冷却辊温度80℃，将冷却后的薄膜在125℃温度下退火20min，制得弹性回复率为96％的硬弹性聚丙烯膜。
实施例3：
将等规度≥96％、密度为0.9±0.05g/cm3的挤出级聚丙烯树脂，在180-250℃温度下经挤出机平模口缝隙挤出，模口缝隙宽度2.0mm，然后经牵伸辊拉伸，拉伸速度为20m/min，拉伸比为1∶200，再经冷却辊冷却，冷却辊温度45℃，将冷却后的薄膜在125℃温度下退火5min，制得弹性回复率为97％的硬弹性聚丙烯膜。
实施例4：
将等规度≥96％、密度为0.9±0.05g/cm3的挤出级聚丙烯树脂，在180-250℃温度下经挤出机平模口缝隙挤出，模口缝隙宽度2.5mm，然后经拉伸速度为20m/min，拉伸比为1∶250，再经冷却辊冷却，冷却辊温度60℃，将冷却后的薄膜在130℃温度下退火5min，制得弹性回复率为96％的硬弹性聚丙烯膜。
实施例5：
将等规度≥96％、密度为0.9±0.05g/cm3的挤出级聚丙烯树脂，在180-250℃温度下经挤出机平模口缝隙挤出，模口缝隙宽度2.8mm，然后经拉伸速度为20m/min，拉伸比为1∶250再经冷却辊冷却，冷却辊温度90℃，将冷却后的薄膜在135℃温度下退火5min，制得弹性回复率为95.5％的硬弹性聚丙烯膜。
上述实施例中，使用的挤出机为串联式MHI挤出机；其通过大口径低产量、串通式MHI挤出机这一特殊的挤出条件；大直径、高精度的拉伸辊(直径达2.4米，温度控制精度为0.2℃)，实现熔融下高倍拉伸。

Claims (1)

1.一种硬弹性聚丙烯膜的制备方法，其特征在于该方法包括如下步骤：
将等规度≥96％、密度为0.9±0.05g/cm3的挤出级聚丙烯树脂，在180-250℃温度下经挤出机平模口缝隙挤出，模口缝隙宽度1.5-3mm，然后经拉伸辊拉伸，其拉伸速度为20-40m/min，拉伸比为1∶100-300倍，再经冷却辊冷却，冷却辊温度30-110℃，将冷却后的薄膜在120-150℃温度下退火5-60min。
CN200910185311A 2009-11-05 2009-11-05 一种硬弹性聚丙烯膜的制备方法 Pending CN101698352A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104861185A (zh) * 2015-04-28 2015-08-26 安徽美翔塑业有限公司 一种薄膜制作工艺
CN105419084A (zh) * 2015-11-23 2016-03-23 安徽松泰包装材料有限公司 一种硬弹性聚丙烯膜

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104861185A (zh) * 2015-04-28 2015-08-26 安徽美翔塑业有限公司 一种薄膜制作工艺
CN105419084A (zh) * 2015-11-23 2016-03-23 安徽松泰包装材料有限公司 一种硬弹性聚丙烯膜

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Application publication date: 20100428