CN115595080A - 一种双面粘结型无初粘边框膜及其制备方法 - Google Patents
一种双面粘结型无初粘边框膜及其制备方法 Download PDFInfo
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Abstract
本发明涉及膜电极制备用边框膜技术领域,提供了一种双面粘结型无初粘边框膜及其制备方法,其中,一种双面粘结型无初粘边框膜,包括基材层,基材层的顶部及底部分别设置有热熔胶层,基材层顶部的热熔胶层上设置有离型膜层;离型膜层采用的是网格离型膜或哑光离型膜,离型膜层的材料厚度为50‑150um;热熔胶层采用的是聚烯烃类热熔胶、共聚酯热熔胶、聚酰胺热熔胶中的一种或几种混合,热熔胶层的厚度为10‑80um。本发明改善了目前质子膜与边框膜热压复合容易不良的工艺问题,同时制备的双面粘结型无初粘边框膜具有高内聚强度、高耐水解性和耐冷热冲击的性能。
Description
技术领域
本发明涉及膜电极制备用边框膜技术领域,尤其涉及一种双面粘结型无初粘边框膜及其制备方法。
背景技术
燃料电池是一种将存在于燃料与氧化剂中的化学能直接转化为电能的发电装置;燃料电池具有零排放、无振动噪音、负荷响应性好、高可靠度等优点;燃料电池通常可分为碱性燃料电池、磷酸型燃料电池、熔融碳酸盐燃料电池、固态氧化物燃料电池以及质子交换膜燃料电池等;其中,质子交换膜燃料电池能量转化效率高,可以在室温下快速启动,并且无电解水流失,寿命长,近年来发展迅速,越来越受到重视。
质子交换膜燃料电池的核心部件包括燃料电池第一面催化剂层、质子交换膜、第二面催化剂层、上边框、下边框和两面的气体扩散层;燃料电池膜电极制造过程通常包括催化剂的制浆、催化剂层的涂覆、边框的贴合、气体扩散层的涂布、气体扩散层的贴合;质子交换膜对温度和湿度很敏感,容易随环境温度和湿度的改变而变形,而边框除可以提高电极有效面积之外的膜强度来稳定膜电极尺寸外,还可以避免质子膜与极板的直接接触造成机械损伤而影响整个燃料电池使用寿命,故一种有效贴合的燃料电池膜电极边框可以大大提升燃料电池的运行可靠性和寿命。
现有技术中一般留白区域及催化层的周边一定尺寸的两侧是分别直接与上边框和下边框贴合用的,在边框贴合过程中,上下两层边框中往往有空气的存在,而边框胶带一般是采用不透气的PEN或PI膜作为基膜,然后在其单面涂覆压敏胶或热熔胶制成,此种单面胶带产品复合质子膜虽然能起到支撑边框的作用,但普通压敏胶或热熔胶的耐温性和耐老化性差,长期在水和防冻液浸泡下容易出现脱开分层问题,从而导致电芯产品损坏,此外压敏胶或热熔胶产品表面具有一定初粘性,在复合质子膜加工过程中不易对位,易造成热压复合偏斜等不良问题。
同时为了确保电堆中的燃料与氧化剂气体不发生泄露,不出现安全隐患且损耗电池性能,能够均匀分布到整个膜电极两侧表面上而又不产生混合直接发生化学反应,膜电极的密封技术就非常关键,如果密封不好,则会发生燃料气体和氧化剂气体的相互间的反应或是向燃料电池外部的渗漏,不但会降低电池的效率,甚至会发生爆炸,对用电设备及人员造成危害;现有技术中一些技术方案会设计相应的橡胶密封圈来起到相应的密封作用,但是随着电堆的单电池片数的增加,这种密封圈结构就会使装配过程变得十分复杂,且容易出现没有装配好的位置,降低电堆整体密封性能的问题。
因此,开发一种双面粘结型无初粘边框膜及其制备方法,改善质子膜与边框膜热压复合的工艺问题,同时具有高内聚强度、高耐水解性和耐冷热冲击,不但具有迫切的研究价值,也具有良好的经济效益和工业应用潜力。
发明内容
为了克服上述所指出的现有技术的缺陷,本发明提供一种双面粘结型无初粘边框膜及其制备方法,改善了目前质子膜与边框膜热压复合容易不良的工艺问题,同时制备的双面粘结型无初粘边框膜具有高内聚强度、高耐水解性和耐冷热冲击的性能。
为解决上述技术问题,本发明的技术方案是:
一种双面粘结型无初粘边框膜,包括基材层,所述基材层的顶部及底部分别设置有热熔胶层,所述基材层顶部的所述热熔胶层上设置有离型膜层,所述离型膜层、热熔胶层、基材层、热熔胶层共同构成四层结构的双面粘结型无初粘边框膜;
所述离型膜层采用的是网格离型膜或哑光离型膜,所述离型膜层的材料厚度为50-150um;
所述热熔胶层采用的是聚烯烃类热熔胶、共聚酯热熔胶、聚酰胺热熔胶中的一种或几种混合,所述热熔胶层的厚度为10-80um。
作为一种改进的方案,所述热熔胶层采用的是聚烯烃树脂与聚酰胺树脂,并添加抗氧剂混合制得,所述聚烯烃树脂、聚酰胺树脂及抗氧剂的混合比例为2:8:1-8:2:1。
作为一种改进的方案,所述聚烯烃树脂采用的是乙烯-丙烯共聚物、乙烯-丁烯-1共聚物、乙烯-4-甲基-1-戊烯共聚物、乙烯-己烯共聚物、乙烯-α-烯烃共聚物中的一种。
作为一种改进的方案,所述聚酰胺树脂采用的是PA6、PA66、PA1010、PA1212中的一种。
作为一种改进的方案,所述抗氧剂采用的是阻胺类抗氧剂、亚磷酸酯类抗氧剂中的一种或两种混合。
作为一种改进的方案,所述基材层采用的是PEN材料、PI材料、PPS材料、LCP材料中的一种。
一种双面粘结型无初粘边框膜的制备方法,包括以下步骤:
S1:将聚烯烃树脂、聚酰胺树脂和抗氧剂按比例称量相应重量,并投入到造粒设备的烘料机中进行干燥;
S2:步骤S1中投入烘料机中的物料干燥之后,通过造粒设备将聚烯烃树脂、聚酰胺树脂和抗氧剂混合熔融并挤出,制作成共混改性粒子;
S3:将步骤S2制得的共混改性粒子投入到挤出流延设备的烘料机中进行干燥,之后通过挤出流延设备将共混改性粒子熔融,并在基材层的表面挤出流延,经冷却牵引后表面贴合上离型膜,并进行收卷,由此制得离型膜层、热熔胶层、基材层的三层结构半成品;
S4:重复步骤S3,通过挤出流延设备在三层结构半成品的基材层另一表面挤出流延,经冷却牵引之后进行收卷,制得离型膜层、热熔胶层、基材层、热熔胶层的四层结构产品。
作为一种改进的方案,在步骤S2及步骤S3中,所述造粒设备及所述挤出流延设备的螺杆温度均为160~210℃,转速均为100~180rpm,挤出模头温度均为190~220℃。
作为一种改进的方案,在步骤S2及步骤S3中,所述造粒设备及所述挤出流延设备的螺杆直径为35mm,螺杆的长径比为40:1~60:1,挤出量为30~55kg/h。
采用了上述技术方案后,本发明的有益效果是:
通过采用聚烯烃树脂与聚酰胺树脂以及抗氧剂共混流延方式制得可以热激活的双面粘结型无初粘边框膜,未受热时,表面无粘性,方便与质子膜复合加工过程中模切及定位,同时,在与质子膜或双极板热压复合时具有优异的排气性,避免热压过程出现气泡问题,极大的提高膜电极电芯制程的良率和效率,在受热压合时,能够迅速提高粘结强度,不仅能够对膜电极起到补强和支撑的作用,同时另一面与双极板具有极高的粘结强度,能够起到密封缓冲作用,避免额外采用橡胶垫密封,影响装配效率及电堆整体密封性能的问题,通过采用PEN材料、PI材料、PPS材料或LCP材料作为基材,具有优秀的物理机械性能、气体阻隔性能、化学稳定性及耐热、耐紫外线、耐辐射等性能,确保边框膜产品具有优异的耐老化性。
综上,本发明提供一种双面粘结型无初粘边框膜及其制备方法,改善了目前质子膜与边框膜热压复合容易不良的工艺问题,同时制备的双面粘结型无初粘边框膜具有高内聚强度、高耐水解性和耐冷热冲击的性能。
附图说明
图1是双面粘结型无初粘边框膜的结构示意图;
图2是双面粘结型无初粘边框膜制备方法的流程图;
其中,在图中,各个数字标号分别指代如下的具体含义、元件和/或部件。
图中:1、基材层,2、热熔胶层,3、离型膜层,4、四层结构的双面粘结型无初粘边框膜。
具体实施方式
下面结合具体的实施例对本发明进一步说明。但这些例举性实施方式的用途和目的仅用来例举本发明,并非对本发明的实际保护范围构成任何形式的任何限定,更非将本发明的保护范围局限于此。
如图1所示,一种双面粘结型无初粘边框膜,包括基材层1,基材层1的顶部及底部分别设置有热熔胶层2,基材层1顶部的热熔胶层2上设置有离型膜层3,离型膜层3、热熔胶层2、基材层1、热熔胶层2共同构成四层结构的双面粘结型无初粘边框膜4;
离型膜层3采用的是网格离型膜或哑光离型膜,离型膜层3的材料厚度为50-150um,本发明中,离型膜层3采用的是网格离型膜材料;
热熔胶层2采用的是聚烯烃类热熔胶、共聚酯热熔胶、聚酰胺热熔胶中的一种或几种混合,热熔胶层2的厚度为10-80um;
基材层1采用的是PEN材料、PI材料、PPS材料、LCP材料中的一种,此类基材具有优秀的物理机械性能、气体阻隔性能、化学稳定性及耐热、耐紫外线、耐辐射等性能。
如图1所示,热熔胶层2采用的是聚烯烃树脂与聚酰胺树脂,并添加抗氧剂混合制得,聚烯烃树脂、聚酰胺树脂及抗氧剂的混合比例为2:8:1-8:2:1;
此外,热熔胶层2还可以采用聚烯烃树脂与共聚酯树脂并添加抗氧剂混合制得,所述聚烯烃树脂、共聚酯树脂及抗氧剂的混合比例为2:8:1-8:2:1;
其中,聚烯烃树脂采用的是乙烯-丙烯共聚物、乙烯-丁烯-1共聚物、乙烯-4-甲基-1-戊烯共聚物、乙烯-己烯共聚物、乙烯-α-烯烃共聚物中的一种,本发明中,聚烯烃树脂采用的是乙烯-α-烯烃共聚物以及醋酸乙烯含量为30%以下的乙烯-醋酸乙烯共聚物;
此外,聚烯烃树脂还可以采用20%-30%含量的乙烯-丙烯共聚物或乙烯-丁烯-1共聚物或乙烯-4-甲基-1-戊烯共聚物或乙烯-己烯共聚物;
聚酰胺树脂采用的是PA6、PA66、PA1010、PA1212中的一种,本发明中,聚酰胺树脂采用的是耐热性及耐水性更好的PA1212树脂,此外,也可以采用PA6或PA66等材质,同时,也可以采用PA1010的材质;
共聚酯树脂采用上海天洋熔融温度在130-180℃的共聚酯树脂胶粒,如PES-3115、PES-3116、PES-3140等中的一种;
抗氧剂采用的是阻胺类抗氧剂、亚磷酸酯类抗氧剂中的一种或两种混合,本发明中,抗氧剂采用的是2,6-二叔丁基对甲酚、四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯、2,2'-亚甲基双(4-甲基-6-叔丁基酚)中的一种或几种混合。
如图1-图2所示,一种双面粘结型无初粘边框膜的制备方法,包括以下步骤:
S1:将聚烯烃树脂、聚酰胺树脂和抗氧剂按比例称量相应重量,并投入到造粒设备的烘料机中进行干燥;
此外,也可以采用聚烯烃树脂、共聚酯树脂和抗氧剂按比例称量相应重量,并投入到造粒设备的烘料机中进行干燥
S2:步骤S1中投入烘料机中的物料干燥之后,通过造粒设备将聚烯烃树脂、聚酰胺树脂和抗氧剂混合熔融并挤出,制作成共混改性粒子;
此外,步骤S1中投入烘料机中的物料干燥之后,通过造粒设备将聚烯烃树脂、共聚酯树脂和抗氧剂混合熔融并挤出,制作成共混改性粒子
S3:将步骤S2制得的共混改性粒子投入到挤出流延设备的烘料机中进行干燥,之后通过挤出流延设备将共混改性粒子熔融,并在基材层1的表面挤出流延,经冷却牵引后表面贴合上离型膜,并进行收卷,由此制得离型膜层3、热熔胶层2、基材层1的三层结构半成品;
S4:重复步骤S3,通过挤出流延设备在三层结构半成品的基材层1另一表面挤出流延,经冷却牵引之后进行收卷,制得离型膜层3、热熔胶层2、基材层1、热熔胶层2的四层结构产品;
在步骤S2及步骤S3中,造粒设备及挤出流延设备的螺杆温度均为160~210℃,转速均为100~180rpm,挤出模头温度均为190~220℃;
在步骤S2及步骤S3中,造粒设备及挤出流延设备的螺杆直径为35mm,螺杆的长径比为40:1~60:1,挤出量为30~55kg/h;
在步骤S1及步骤S3中,干燥的温度均为100℃,干燥的时间均为4h。
综上,通过采用聚烯烃树脂与聚酰胺树脂以及抗氧剂共混流延方式制得可以热激活的双面粘结型无初粘边框膜,未受热时,表面无粘性,方便与质子膜复合加工过程中模切及定位,同时,在与质子膜或双极板热压复合时具有优异的排气性,避免热压过程出现气泡问题,极大的提高膜电极电芯制程的良率和效率,在受热压合时,能够迅速提高粘结强度,不仅能够对膜电极起到补强和支撑的作用,同时另一面与双极板具有极高的粘结强度,能够起到密封缓冲作用,避免额外采用橡胶垫密封,影响装配效率及电堆整体密封性能的问题,通过采用PEN材料、PI材料、PPS材料或LCP材料作为基材,具有优秀的物理机械性能、气体阻隔性能、化学稳定性及耐热、耐紫外线、耐辐射等性能,确保边框膜产品具有优异的耐老化性。
以下为不同参数下制得的双面粘结型无初粘边框膜:
实施例1:
将陶氏化学聚烯烃树脂INFUSE 9000与上海天洋聚酰胺树脂2173和抗氧剂1010,按重量比80/20/1称取后搅拌,并均匀加入到造粒设备的烘料机中干燥,干燥温度100℃,干燥时间为4h,造粒设备挤出温度为180℃,转速为120rpm,进行造粒,制备聚烯烃与聚酰胺共混改性粒子;
将制得的共混改性粒子加入到挤出流延设备的烘料机中,干燥时间为4h;挤出流延设备的温度为180℃,转速为120rpm,在25umPEN基材上挤出流延并与50um离型膜贴合,制得50um离型膜加20um热熔胶层2加25umPEN基材的半成品,在半成品的PEN基材另一面继续流延20um热熔胶层2,经挤压、冷却收卷即可制得双面粘结型无初粘边框膜产品,待熟化后分别测试对质子膜的粘着力、初粘性,溢胶性、90℃水煮1000h后粘着力,并填入表一中;
实施例2:
将陶氏化学聚烯烃树脂INFUSE 9000与上海天洋聚酰胺树脂2173和抗氧剂264,按重量比80/20/1称取后搅拌,并均匀加入到造粒设备的烘料机中干燥,干燥温度100℃,干燥时间为4h,造粒设备挤出温度为180℃,转速为120rpm,进行造粒,制备聚烯烃与聚酰胺共混改性粒子;
将制得的共混改性粒子加入到挤出流延设备的烘料机中,干燥时间为4h;挤出流延设备的温度为180℃,转速为120rpm,在25umPI基材上挤出流延并与50um离型膜贴合,制得50um离型膜加20um热熔胶层2加25umPI基材的半成品,在半成品的PI基材另一面继续流延20um热熔胶层2,经挤压、冷却收卷即可制得双面粘结型无初粘边框膜产品,之后,进行初粘力、热激活后粘着力、溢胶性及水煮状态下的粘着力的性能测试,待熟化后分别测试对质子膜的粘着力、初粘性,溢胶性、90℃水煮1000h后粘着力,并填入表一中;
实施例3:
将陶氏化学聚烯烃树脂INFUSE 9000与上海天洋聚酰胺树脂2173和抗氧剂1076,按重量比80/20/1称取后搅拌,并均匀加入到造粒设备的烘料机中干燥,干燥温度100℃,干燥时间为4h,造粒设备挤出温度为180℃,转速为120rpm,进行造粒,制备聚烯烃与聚酰胺共混改性粒子;
将制得的共混改性粒子加入到挤出流延设备的烘料机中,干燥时间为4h;挤出流延设备的温度为180℃,转速为120rpm,在25umPEN基材上挤出流延并与50um离型膜贴合,制得50um离型膜加10um热熔胶层2加25umPEN基材的半成品,在半成品的PEN基材另一面继续流延10um热熔胶层2,经挤压、冷却收卷即可制得双面粘结型无初粘边框膜产品,之后,进行初粘力、热激活后粘着力、溢胶性及水煮状态下的粘着力的性能测试,待熟化后分别测试对质子膜的粘着力、初粘性,溢胶性、90℃水煮1000h后粘着力,并填入表一中;
实施例4:
将陶氏化学聚烯烃树脂INFUSE 9000与上海天洋聚酰胺树脂2173和抗氧剂1010,按重量比75/25/1称取后搅拌,并均匀加入到造粒设备的烘料机中干燥,干燥温度100℃,干燥时间为4h,造粒设备挤出温度为180℃,转速为120rpm,进行造粒,制备聚烯烃与聚酰胺共混改性粒子;
将制得的共混改性粒子加入到挤出流延设备的烘料机中,干燥时间为4h;挤出流延设备的温度为180℃,转速为120rpm,在25umPEN基材上挤出流延并与50um离型膜贴合,制得50um离型膜加10um热熔胶层2加25umPEN基材的半成品,在半成品的PEN基材另一面继续流延10um热熔胶层2,经挤压、冷却收卷即可制得双面粘结型无初粘边框膜产品,之后,进行初粘力、热激活后粘着力、溢胶性及水煮状态下的粘着力的性能测试,待熟化后分别测试对质子膜的粘着力、初粘性,溢胶性、90℃水煮1000h后粘着力,并填入表一中;
实施例5:
将陶氏化学聚烯烃树脂INFUSE 9000与上海天洋聚酰胺树脂2173和抗氧剂1010,按重量比70/30/1称取后搅拌,并均匀加入到造粒设备的烘料机中干燥,干燥温度100℃,干燥时间为4h,造粒设备挤出温度为180℃,转速为120rpm,进行造粒,制备聚烯烃与聚酰胺共混改性粒子;
将制得的共混改性粒子加入到挤出流延设备的烘料机中,干燥时间为4h;挤出流延设备的温度为180℃,转速为120rpm,在25umPEN基材上挤出流延并与50um离型膜贴合,制得50um离型膜加20um热熔胶层2加25umPEN基材的半成品,在半成品的PEN基材另一面继续流延20um热熔胶层2,经挤压、冷却收卷即可制得双面粘结型无初粘边框膜产品,之后,进行初粘力、热激活后粘着力、溢胶性及水煮状态下的粘着力的性能测试,待熟化后分别测试对质子膜的粘着力、初粘性,溢胶性、90℃水煮1000h后粘着力,并填入表一中;
实施例6:
将陶氏化学聚烯烃树脂INFUSE 9000与上海天洋聚酰胺树脂2173和抗氧剂1010,按重量比75/25/1称取后搅拌,并均匀加入到造粒设备的烘料机中干燥,干燥温度100℃,干燥时间为4h,造粒设备挤出温度为180℃,转速为120rpm,进行造粒,制备聚烯烃与聚酰胺共混改性粒子;
将制得的共混改性粒子加入到挤出流延设备的烘料机中,干燥时间为4h;挤出流延设备的温度为180℃,转速为120rpm,在25umPEN基材上挤出流延并与50um离型膜贴合,制得50um离型膜加80um热熔胶层2加25umPEN基材的半成品,在半成品的PEN基材另一面继续流延80um热熔胶层2,经挤压、冷却收卷即可制得双面粘结型无初粘边框膜产品,之后,进行初粘力、热激活后粘着力、溢胶性及水煮状态下的粘着力的性能测试,待熟化后分别测试对质子膜的粘着力、初粘性,溢胶性、90℃水煮1000h后粘着力,并填入表一中;
实施例7:
将陶氏化学聚烯烃树脂INFUSE 9000与上海天洋共聚酯树脂PES-3140和抗氧剂1010,按重量比65/35/1称取后搅拌,并均匀加入到造粒设备的烘料机中干燥,干燥温度100℃,干燥时间为4h,造粒设备挤出温度为180℃,转速为120rpm,进行造粒,制备聚烯烃与共聚酯树脂共混改性粒子;
将制得的共混改性粒子加入到挤出流延设备的烘料机中,干燥时间为4h;挤出流延设备的温度为180℃,转速为120rpm,在25umPEN基材上挤出流延并与50um离型膜贴合,制得50um离型膜加20um热熔胶层2加25umPEN基材的半成品,在半成品的PEN基材另一面继续流延20um热熔胶层2,经挤压、冷却收卷即可制得双面粘结型无初粘边框膜产品,之后,进行初粘力、热激活后粘着力、溢胶性及水煮状态下的粘着力的性能测试,待熟化后分别测试对质子膜的粘着力、初粘性,溢胶性、90℃水煮1000h后粘着力,并填入表一中;
实施例8:
将陶氏化学聚烯烃树脂INFUSE 9000与上海天洋共聚酯树脂PES-3140和抗氧剂1076,按重量比45/55/1称取后搅拌,并均匀加入到造粒设备的烘料机中干燥,干燥温度100℃,干燥时间为4h,造粒设备挤出温度为180℃,转速为120rpm,进行造粒,制备聚烯烃与共聚酯树脂共混改性粒子;
将制得的共混改性粒子加入到挤出流延设备的烘料机中,干燥时间为4h;挤出流延设备的温度为180℃,转速为120rpm,在25umPEN基材上挤出流延并与50um离型膜贴合,制得50um离型膜加15um热熔胶层2加25umPEN基材的半成品,在半成品的PEN基材另一面继续流延15um热熔胶层2,经挤压、冷却收卷即可制得双面粘结型无初粘边框膜产品,之后,进行初粘力、热激活后粘着力、溢胶性及水煮状态下的粘着力的性能测试,待熟化后分别测试对质子膜的粘着力、初粘性,溢胶性、90℃水煮1000h后粘着力,并填入表一中;
表一:不同参数下制得的双面粘结型无初粘边框膜的性能测试结果
综上可得,本发明提供一种双面粘结型无初粘边框膜及其制备方法,改善目前质子膜与边框膜热压复合容易不良的工艺问题,同时制备的双面粘结型无初粘边框膜具有高内聚强度、高耐水解性和耐冷热冲击的性能。
应当理解,以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围,其均应涵盖在本发明的权利要求和说明书的范围当中。
Claims (9)
1.一种双面粘结型无初粘边框膜,其特征在于:包括基材层,所述基材层的顶部及底部分别设置有热熔胶层,所述基材层顶部的热熔胶层上设置有离型膜层,所述离型膜层、热熔胶层、基材层、热熔胶层共同构成四层结构的双面粘结型无初粘边框膜;
所述离型膜层采用的是网格离型膜或哑光离型膜,所述离型膜层的材料厚度为50-150um;
所述热熔胶层采用的是聚烯烃类热熔胶、共聚酯热熔胶、聚酰胺热熔胶中的一种或几种混合,所述热熔胶层的厚度为10-80um。
2.如权利要求1所述的一种双面粘结型无初粘边框膜,其特征在于:所述热熔胶层采用的是聚烯烃树脂与聚酰胺树脂,并添加抗氧剂混合制得,所述聚烯烃树脂、聚酰胺树脂及抗氧剂的混合比例为2:8:1-8:2:1。
3.如权利要求2所述的一种双面粘结型无初粘边框膜,其特征在于:所述聚烯烃树脂采用的是乙烯-丙烯共聚物、乙烯-丁烯-1共聚物、乙烯-4-甲基-1-戊烯共聚物、乙烯-己烯共聚物、乙烯-α-烯烃共聚物中的一种。
4.如权利要求2所述的一种双面粘结型无初粘边框膜,其特征在于:所述聚酰胺树脂采用的是PA6、PA66、PA1010、PA1212中的一种。
5.如权利要求2所述的一种双面粘结型无初粘边框膜,其特征在于:所述抗氧剂采用的是阻胺类抗氧剂、亚磷酸酯类抗氧剂中的一种或两种混合。
6.如权利要求2所述的一种双面粘结型无初粘边框膜,其特征在于:所述基材层采用的是PEN材料、PI材料、PPS材料、LCP材料中的一种。
7.一种双面粘结型无初粘边框膜的制备方法,其特征在于:包括以下步骤:
S1:将聚烯烃树脂、聚酰胺树脂和抗氧剂按比例称量相应重量,并投入到造粒设备的烘料机中进行干燥;
S2:步骤S1中投入烘料机中的物料干燥之后,通过造粒设备将聚烯烃树脂、聚酰胺树脂和抗氧剂混合熔融并挤出,制作成共混改性粒子;
S3:将步骤S2制得的共混改性粒子投入到挤出流延设备的烘料机中进行干燥,之后通过挤出流延设备将共混改性粒子熔融,并在基材层的表面挤出流延,经冷却牵引后表面贴合上离型膜,并进行收卷,由此制得离型膜层、热熔胶层、基材层的三层结构半成品;
S4:重复步骤S3,通过挤出流延设备在三层结构半成品的基材层另一表面挤出流延,经冷却牵引之后进行收卷,制得离型膜层、热熔胶层、基材层、热熔胶层的四层结构产品。
8.如权利要求7所述的一种双面粘结型无初粘边框膜的制备方法,其特征在于:在步骤S2及步骤S3中,所述造粒设备及所述挤出流延设备的螺杆温度均为160~210℃,转速均为100~180rpm,挤出模头温度均为190~220℃。
9.如权利要求7所述的一种双面粘结型无初粘边框膜的制备方法,其特征在于:在步骤S2及步骤S3中,所述造粒设备及所述挤出流延设备的螺杆直径为35mm,螺杆的长径比为40:1~60:1,挤出量为30~55kg/h。
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