CN112574685A - 曲面玻璃制程或出货用复合pe保护膜及制备方法 - Google Patents

曲面玻璃制程或出货用复合pe保护膜及制备方法 Download PDF

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CN112574685A
CN112574685A CN202011421747.6A CN202011421747A CN112574685A CN 112574685 A CN112574685 A CN 112574685A CN 202011421747 A CN202011421747 A CN 202011421747A CN 112574685 A CN112574685 A CN 112574685A
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许燕萍
许燕玲
刘一鸣
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Jiangsu Polytechnic College of Agriculture and Forestry
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Abstract

本发明公开了一种曲面玻璃制程或出货用复合PE保护膜及制备方法，复合PE保护膜，包括PE基材层，所述PE基材层下表面设置有光学级亚克力胶层，先通过三层共挤工艺将基材表层、基材芯层和基材涂布层一体制成复合基材层，再通过涂布工艺将调配好的胶水涂布于基材层表面，烘干卷曲后获得成品。本发明兼顾耐高温和柔软易贴的特点，可以在3D曲面玻璃贴合时很好对曲面部分实现全覆盖，良率高，制备方法简单，效率高。

Description

曲面玻璃制程或出货用复合PE保护膜及制备方法
技术领域
本发明涉及保护膜及制备方法，具体涉及一种曲面玻璃制程或出货用复合PE保护膜及制备方法。
背景技术
从智能手机推入市场后，大屏触控、玻璃材质手感就逐渐引领消费市场潮流，盖板玻璃逐渐成为智能手机、平板电脑、智能手表、可穿戴智能产品、车载面板等终端交互设备的重要组成部分。从最初的2D平面玻璃，到2.5D弧边玻璃，经IPHONE创办人贾伯斯构思3D曲面玻璃发展蓝图后，开启了发展趋势，相继有厂商投入3D产品各种成型技术研发，材料大厂如美国CORNING、德国SCHOTT、日本NEG、日本AGC也相继开发出适合模造成型用的玻璃材料，不断改善玻璃硬度与耐刮伤等脆弱问题。时至今日3D曲面玻璃已逐渐成为主流消费电子产品标配，2019IFA展览上，瀑布屏手机又一次出现在了大众的视野中更是将3D曲面玻璃提升到一个新的高度，瀑布屏的特色就是超大的弯折角度(OPPO为88°)，这在给消费者提供惊艳的视觉震撼的同时，对相关生产制造环节也提出了更高的要求。
盖板玻璃在制程和出货时为有效保护表面不被污染或划伤，通常会在表面贴上一层保护膜，要求易贴易撕无残留，剥离力通常在20g/25mm以下，出货过程可能会涉及到集装箱高温运输，要求保护膜70度下无形变及气泡出现。
2D平面玻璃和2.5D弧边玻璃的表面保护解决方案通常采用PET保护膜，这类保护膜具有抗刮耐高温易模切加工等特点而得到广泛应用，但因为材质本身偏硬，在3D曲面玻璃贴合时无法很好对曲面部分实现全覆盖，良率较低，需要在后段模组贴合工序前对玻璃清洗后再进行贴合，对成本和效率都有较大影响。
发明内容
发明目的：本发明的目的是提供一种曲面玻璃制程或出货用复合PE保护膜及制备方法，解决现有PET保护膜材质偏硬，在3D曲面玻璃贴合时无法很好对曲面部分实现全覆盖、良率较低的问题。
技术方案：本发明所述的曲面玻璃制程或出货用复合PE保护膜，包括PE基材层，所述PE基材层下表面设置有光学级亚克力胶层。
为了保证耐温和柔软性，所述PE基材层从上至下包括基材表层，基材芯层和基材涂布层，所述基材表层的厚度为10-50微米，所述基材芯层的厚度为20-100微米，所述基材涂布层的厚度为10-50微米。
所述基材表层和基材涂布层的材料成分包括聚乙烯、聚丙烯和聚四氟乙烯，其其重量比分别为52～65％、35～42％、3～6％。
所述基材芯层的材料为聚烯烃塑性体。
所述光学级亚克力胶层由胶水涂布在基材层表面经烘干而形成，胶水包括重量比15％-30％的丙烯酸酯类粘着剂、重量比70％-85％的乙酸乙酯和重量比1％-8％的异氰酸酯类固化剂。
所述丙烯酸酯类粘着剂包括重量比30-35％的丙烯酸共聚物、重量比34-37％的乙酸乙酯、重量比28-33％的甲苯和重量比2-4％的甲醇。
异氰酸酯固化剂能够充分结合亚克力胶水中的亲水基团，使交联反应之后的成品不具备亲水性能，进而确保贴合被贴物后不会吸附环境中游离的水分子，集聚在被贴物表面产生污染，所述异氰酸酯类固化剂为六亚甲基二异氰酸酯，异氰酸酯基团的重量占比为20％-25％。
本发明所述的曲面玻璃制程或出货用复合PE保护膜的制备方法，包括以下步骤：
(1)分别将基材表层、基材芯层和基材涂布层的原料混合均匀，倒入料桶中，由吸料机自动抽入到高温熔化管道；
(2)在挤出机中经过高温熔融塑化后通过环形模头挤成膜管，由压缩空气将其吹胀冷却定型后制成基材层；
(3)对基材涂布层进行表面电晕处理，处理后涂布层表面电晕值42dyn以上，确保后工序涂胶不会残胶；
(4)将基材膜装上涂布机，将调配好光学级亚克力胶层的胶水倒入胶槽，采用网纹辊涂布方式涂布，在基材膜表面涂覆胶水，经烘道烘干后卷曲获得复合PE保护膜。
有益效果：本发明兼顾耐高温和柔软易贴的特点，可以在3D曲面玻璃贴合时很好对曲面部分实现全覆盖，良率高，制备方法简单，效率高。
附图说明
图1是本发明复合膜的结构示意图。
具体实施方式
下面结合附图对发明进行进一步说明。
如图1所示，曲面玻璃制程或出货用复合PE保护膜，包括PE基材层A，PE基材层下表面设置有光学级亚克力胶层4，保护膜的厚度为40-150微米，光学级亚克力胶层的厚度为1-5微米，PE基材层从上至下包括基材表层1，基材芯层2和基材涂布层3，基材表层的厚度为10-50微米，基材芯层的厚度为20-100微米，基材涂布层的厚度为10-50微米，基材表层和基材涂布层的材料成分包括聚乙烯、聚丙烯和聚四氟乙烯，其重量比分别为52～65％、35～42％、3～6％，基材芯层的材料为为聚烯烃塑性体，光学级亚克力胶层由胶水涂布在基材层表面经烘干而形成，胶水包括重量比15％-30％的丙烯酸酯类粘着剂、重量比70％-85％的乙酸乙酯和重量比1％-8％的异氰酸酯类固化剂，丙烯酸酯类粘着剂包括重量比30-35％的丙烯酸共聚物、重量比34-37％的乙酸乙酯、重量比28-33％的甲苯和重量比2-4％的甲醇，异氰酸酯类固化剂为六亚甲基二异氰酸酯，异氰酸酯基团的重量占比为20％-25％。先通过三层共挤工艺将基材表层1、基材芯层2和基材涂布层3一体制成复合基材层，再通过涂布工艺将调配好的胶水涂布于基材层表面，烘干卷曲后获得成品本发明的主体材料是聚乙烯、聚丙烯和聚烯烃塑性体，聚乙烯提供基础的柔韧性，聚丙烯改善耐温性能，聚烯烃塑性体同时改善柔韧性和耐温性能。聚四氟乙烯作为添加剂进一步改善耐温性能，光学级亚克力胶层确保贴合到3D曲面玻璃后易贴易撕无残留。
制备本发明的曲面玻璃制程或出货用复合PE保护膜时包括以下步骤：
(1)分别将基材表层、基材芯层和基材涂布层的原料混合均匀，倒入料桶中，由吸料机自动抽入到高温熔化管道；
(2)在挤出机中经过高温熔融塑化后通过环形模头挤成膜管，由压缩空气将其吹胀冷却定型后制成基材层；
(3)对基材涂布层进行表面电晕处理，处理后涂布层表面电晕值42dyn以上，确保后工序涂胶不会残胶；
(4)将基材膜装上涂布机，将调配好光学级亚克力胶层的胶水倒入胶槽，采用网纹辊涂布方式涂布，在基材膜表面涂覆胶水，经烘道烘干后卷曲获得复合PE保护膜。
将所制备的保护膜贴合于5.8寸3D曲面玻璃，经70度4小时后，无污染，无残胶起雾、无形变气泡产生，高温后剥离力<20g/25mm，将本发明制备的复合保护膜与100％PE基材和PET膜进行性能测试，测试数据结果如下表所示：
表1性能测试数据结果对比
序号 基材名称 厚度um 常温贴合性 耐候性/50℃*4H 耐候性/70℃*4H
1 100％PE基材 50 良好 良好 形变，有气炮
2 本发明复合膜 50 良好 良好 良好
3 PET基材 50 良好 翘曲，有气泡 翘曲，有气泡
由上表可知，纯PE基材产品高温70度后耐温性能不达标，PET基材耐温性能达标但是因为基材柔软度不够，贴合后有气泡产生，本发明的复合膜耐温性和柔软性能好，外观无形变和气泡。

Claims (8)

1.一种曲面玻璃制程或出货用复合PE保护膜，其特征在于，包括PE基材层，所述PE基材层下表面设置有光学级亚克力胶层。
2.根据权利要求1所述的曲面玻璃制程或出货用复合PE保护膜，其特征在于，所述PE基材层从上至下包括基材表层，基材芯层和基材涂布层，所述基材表层的厚度为10-50微米，所述基材芯层的厚度为20-100微米，所述基材涂布层的厚度为10-50微米。
3.根据权利要求2所述的曲面玻璃制程或出货用复合PE保护膜，其特征在于，所述基材表层和基材涂布层的材料成分包括聚乙烯、聚丙烯和聚四氟乙烯，其重量比分别为52～65％、35～42％、3～6％。
4.根据权利要求1所述的曲面玻璃制程或出货用复合PE保护膜，其特征在于，所述基材芯层的材料为为聚烯烃塑性体。
5.根据权利要求1所述的曲面玻璃制程或出货用复合PE保护膜，其特征在于，所述光学级亚克力胶层由胶水涂布在基材层表面经烘干而形成，胶水包括重量比15％-30％的丙烯酸酯类粘着剂、重量比70％-85％的乙酸乙酯和重量比1％-8％的异氰酸酯类固化剂。
6.根据权利要求5所述的曲面玻璃制程或出货用复合PE保护膜，其特征在于，所述丙烯酸酯类粘着剂包括重量比30-35％的丙烯酸共聚物、重量比34-37％的乙酸乙酯、重量比28-33％的甲苯和重量比2-4％的甲醇。
7.根据权利要求5所述的曲面玻璃制程或出货用复合PE保护膜，其特征在于，所述异氰酸酯类固化剂为六亚甲基二异氰酸酯，异氰酸酯基团的重量占比为20％-25％。
8.如权利要求1所述的曲面玻璃制程或出货用复合PE保护膜的制备方法，其特征在于，包括以下步骤：
(1)分别将基材表层、基材芯层和基材涂布层的原料混合均匀，倒入料桶中，由吸料机自动抽入到高温熔化管道；
(2)在挤出机中经过高温熔融塑化后通过环形模头挤成膜管，由压缩空气将其吹胀冷却定型后制成基材层；
(3)对基材涂布层进行表面电晕处理，处理后涂布层表面电晕值42dyn以上，确保后工序涂胶不会残胶；
(4)将基材膜装上涂布机，将调配好光学级亚克力胶层的胶水倒入胶槽，采用网纹辊涂布方式涂布，在基材膜表面涂覆胶水，经烘道烘干后卷曲获得复合PE保护膜。
CN202011421747.6A 2020-12-08 2020-12-08 曲面玻璃制程或出货用复合pe保护膜及制备方法 Pending CN112574685A (zh)

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