CN105754536A - 一种透明抗静电压敏胶 - Google Patents

一种透明抗静电压敏胶 Download PDF

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CN105754536A
CN105754536A CN201610134737.1A CN201610134737A CN105754536A CN 105754536 A CN105754536 A CN 105754536A CN 201610134737 A CN201610134737 A CN 201610134737A CN 105754536 A CN105754536 A CN 105754536A
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赵健
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Zhangjiagang Ruima New Material Co Ltd
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Abstract

本发明公开了一种透明抗静电压敏胶，所述的压敏胶中各组分的重量份数如下：多元醇和多异氰酸酯的混合物1000重量份，催化剂0.8重量份，扩链剂5～30重量份，交联剂120～200重量份，抗静电剂10～50重量份，所述的多元醇和多异氰酸酯的混合物中异氰酸酯基与羟基的摩尔比为1.95～2：1；本发明生产的压敏胶其整体透明，光学性能好，同时产品本身具有较好的抗静电性；且本发明涉及的添加剂中不含任何重金属离子，在精密电子行业广泛应用。

Description

一种透明抗静电压敏胶
技术领域
本发明涉及压敏胶的生产技术领域，尤其涉及一种透明、抗静电压敏胶。
背景技术
压敏胶是胶粘剂领域里一个重要的独立分支，由于具有干粘性和永久粘性。其特点是粘之容易，揭去不难，剥而不损。压敏胶因使用方便，用途广泛，故发展异常迅速，国内外近几年的增长速度都在10%以上。压敏胶制品表面与其他物体摩擦时会引起电荷分离而产生静电。在溶剂型压敏胶涂布时，静电产生的火花会引起燃烧爆炸，或压敏产品应用于精密电子产品生产过程中，静电造成击穿会带来巨大损失。常用的方法是在压敏胶配方中加入导电物质，将胶的表面层电阻降低到106Ω～1011Ω，从而减少在加工或使用过程中的静电积累。
常规的抗静电剂如炭黑或石墨以及它们的混合物，在采用这两种抗静电剂生产的压敏胶不仅会造成胶面变色，而且产品的导电性差，胶面抗静电效果一般。
同时金属粉末类型的压敏胶抗静电剂在添加后必然会导致胶面变色，无法用于透明且要求抗静电的产品。且添加前需考虑到金属粉末或金属粒子的形貌，粒径及其分布，工艺较为复杂。而当设计达到某一电阻率时，还需考虑对压敏胶粘性造成的下降等因素。即使不考虑胶面的变色，采用镀金属的填料来达到抗静电改性的目的，常常会由于改性填料的不稳定，压敏胶的抗静电性在加工和使用过程中出现损失等缺点。
专利CN201310654380.6公开了一种防静电压敏胶保护膜及其制备方法，该方法生产的压敏胶保护膜具有较好的抗静电性能，同时不影响保护膜本身的剥离力，但是该方法生产的压敏胶保护膜中添加了相关的金属添加剂，金属添加剂的用量过多后，不仅会影响压敏胶的透明性，其最终的产品在应用过程中很容易产生导电效应，不能应用于电子行业。
专利CN201210292417.0公开了一种防静电自排气保护胶带及其制备方法，该发明生产的压敏胶具有较好的抗静电性能和热稳定性，且具有自排气的功能；但是本发明的配方中也含有铂金催化剂，该催化剂不仅使用成本较高，而且会影响压敏胶的透明性和抗静电性能。
发明内容
针对上述存在的问题，本发明目的在于提供一种具有抗静电功能，胶体透明，适用于精密电子行业的压敏胶。
为了达到上述目的，本发明采用的技术方案如下：一种透明抗静电压敏胶，所述的压敏胶中各组分的重量份数如下：多元醇和多异氰酸酯的混合物1000重量份，催化剂0.8重量份，扩链剂5～30重量份，交联剂120～200重量份，抗静电剂10～50重量份，所述的多元醇和多异氰酸酯的混合物中异氰酸酯基与羟基的摩尔比为1.95～2：1。
本发明所述的多元醇为聚酯二元醇或聚醚二元醇中的一种。
低分子量的多元醇不能单独作为聚氨酯压敏胶的羟基组分，通常体系粘弹性不足，无法制成压敏胶。合成压敏胶可采用分子主链上含有酯基，在端基上具有羟基的大分子二元醇，分子量在500～3000，优选2000。其内聚能大，可作为良好的压敏胶原料之一。此外，主链结构上含有醚键，端基带有羟基的二元醇的齐聚物，分子量在3000～5000，优选3000。可提供胶黏剂体系的低粘度和优良的加工性，也是良好的压敏胶原料之一。
本发明所述的多异氰酸酯为六亚甲基二异氰酸酯（HDI）、异佛尔酮二异氰酸酯(IPDI)中的一种或者两种以任意比例的混合物。目标制品的透明无色要求，需避免采用芳香族异氰酸酯。本发明选用脂肪族二异氰酸酯，如六亚甲基二异氰酸酯（HDI）、异佛尔酮二异氰酸酯(IPDI)中的一种或者两种以任意比例的混合物。也可采用二环己基甲烷二异氰酸酯，三甲基六甲叉二异氰酸酯和二聚酸二异氰酸酯等。
本发明所述的催化剂为二桂酸二丁基锡，所述的扩链剂为三羟甲基丙烷，所述的交联剂为氨基树脂，所述的抗静电剂为三氟甲磺酸锂。
本发明所述的压敏胶需要在溶剂中反应，所述的溶剂为醋酸丁酯和环己酮的混合物，溶剂中醋酸丁酯与环己酮的重量比为1:1。聚氨酯溶剂通常以酯类为最多，因其溶解力强，挥发速度适中，毒性较低。
本发明提供一种透明抗静电压敏胶的生产方法，其生产方法如下：
1）将相应重量的多元醇、异氰酸酯和溶剂加入反应釜中，在N2的保护下混合均匀；
2）将步骤1）的产品升温至50℃，加入相应重量的催化剂反应2h，降温至60℃，加入相应重量的扩链剂，在80℃下反应3小时，得到压敏胶A组分；
3）将步骤2）得到的压敏胶A组分中加入溶剂进行稀释，稀释后溶质的质量分数为18～24%，接着加入相应重量的交联剂和抗静电剂，混合均匀；
4）将步骤3）中得到产品进行涂布操作；
5）涂布操作后，将步骤4）的产品在120℃下保温1min，再经60℃下熟化48h，将溶剂挥发，最终制得具有抗静电性的压敏胶。
本发明所述的步骤1）的操作过程中，溶剂的用量与多元醇和多异氰酸酯的混合物的重量相同。
本发明所述的步骤4）的涂布操作中，涂布量为10～30g/m2。
本发明的优点在于：本发明生产的最终压敏胶产品，其整体透明，光学性能好，同时产品本身具有较好的抗静电性；涉及的添加剂中不含任何重金属离子，在精密电子行业广泛应用；本发明的压敏胶的生产方法简单，方便控制和调控，最终产生产的产品的综合性能优秀，应用范围广，实用效果好。
具体实施方式
下面结合具体实施方式对本发明作进一步详细的描述。
实施例1：一种透明抗静电压敏胶，所述的压敏胶中各组分的重量份数如下：聚酯二元醇和六亚甲基二异氰酸酯的混合物1000g，异氰酸酯基与羟基的摩尔比为1.95:1，催化剂二桂酸二丁基锡0.8g，扩链剂三羟甲基丙烷5g，交联剂氨基树脂120g，抗静电剂三氟甲磺酸锂10g。
实施例1的产品性能：初粘力20～30(g/25mm)；180度SS表面剥离30～40(g/25mm)；表面电阻1011(Ω)。
实施例2：一种透明抗静电压敏胶，所述的压敏胶中各组分的重量份数如下：聚醚二元醇和异佛尔酮二异氰酸酯的混合物1000g，异氰酸酯基与羟基的摩尔比为2：1，催化剂二桂酸二丁基锡0.8g，扩链剂三羟甲基丙烷30g，交联剂氨基树脂200g，抗静电剂三氟甲磺酸锂50g。
实施例2的产品性能：初粘力2～5(g/25mm)；180度SS表面剥离3～5(g/25mm)；表面电阻108(Ω)。
实施例3：一种透明抗静电压敏胶，所述的压敏胶中各组分的重量份数如下：聚酯二元醇、聚醚二元醇和六亚甲基二异氰酸酯的混合物1000g，异氰酸酯基与羟基的摩尔比为1.96:1，催化剂二桂酸二丁基锡0.8g，扩链剂三羟甲基丙烷15g，交联剂氨基树脂150g，抗静电剂三氟甲磺酸锂25g。
实施例3的产品性能：初粘力5～10(g/25mm)；180度SS表面剥离10～15(g/25mm)；表面电阻1010(Ω)。
实施例4：一种透明抗静电压敏胶，所述的压敏胶中各组分的重量份数如下：聚酯二元醇、异佛尔酮二异氰酸酯和六亚甲基二异氰酸酯的混合物1000g，异氰酸酯基与羟基的摩尔比为1.98:1，催化剂二桂酸二丁基锡0.8g，扩链剂三羟甲基丙烷20g，交联剂氨基树脂180g，抗静电剂三氟甲磺酸锂45g。
实施例4的产品性能：初粘力10～20(g/25mm)；180度SS表面剥离20～30(g/25mm)；表面电阻109(Ω)。
实施例5：一种透明抗静电压敏胶，所述的压敏胶中各组分的重量份数如下：聚酯二元醇、聚醚二元醇、异佛尔酮二异氰酸酯和六亚甲基二异氰酸酯的混合物1000g，异氰酸酯基与羟基的摩尔比为1.98:1，催化剂二桂酸二丁基锡0.8g，扩链剂三羟甲基丙烷25g，交联剂氨基树脂160g，抗静电剂三氟甲磺酸锂35g。
实施例5的产品性能：初粘力10～16(g/25mm)；180度SS表面剥离16～20(g/25mm)；表面电阻109(Ω)。
实施例6：配方对比试验，采用相同的生产方法，将本发明的实施例1-5进行对比试验，具体的实验结果如下表所示：（下表中各项物理指标的测试方法均采用国标测试方法测得）
透明抗静电压敏胶配方对比试验
从上表中可以看出，-NCO基团与-OH基团的比例直接影响反应故从中产品的粘性，当其处于1.95～2：1时，最终产品的粘性较好，抗静电性能优秀；而在对比例1中，当-NCO基团与-OH基团的比例中，-NCO基团的用量低于1.95:1时，生产过程中的反应体系无粘性，导致最终产品无法进行；同时在对比例2中，当-NCO基团与-OH基团的比例中，-NCO基团的用量高于2:1时，生产过程中的体系粘度过大，最终导致反应无法进行下去。
实施例7：本发明提供一种透明抗静电压敏胶的生产方法，其生产方法如下：
1）将相应重量的多元醇、异氰酸酯和溶剂加入反应釜中，溶剂的用量与多元醇和多异氰酸酯的混合物的重量相同，在N2的保护下混合均匀。
2）将步骤1）的产品升温至50℃，加入相应重量的催化剂反应2h，降温至60℃，加入相应重量的扩链剂，在80℃下反应3小时，得到压敏胶A组分。
3）将步骤2）得到的压敏胶A组分中加入溶剂进行稀释，稀释后溶质的质量分数为18～24%，接着加入相应重量的交联剂和抗静电剂，混合均匀。
4）将步骤3）中得到产品进行涂布操作；涂布克数为10～30g/m3。
5）涂布操作后，将步骤4）的产品在120℃下保温1min，再经60℃下熟化48h，将溶剂挥发，最终制得具有抗静电性的压敏胶。
实施例8：采用实施例1中的配方，对该配方的生产方法在相同条件下进行对比试验，得到的实验结果如下表所示：
将溶剂的稀释量适当增大，不影响胶水的粘性和抗静电性，当稀释浓度过大时，如低于18%时，则最终产品的粘度下降，影响压敏胶的粘黏性能；而当稀释浓度不足，如30%时，由于体系粘度过大，抗静电剂分散不良，造成制品抗静电性受到影响。因此本发明的生产方法中选用18～24%的稀释浓度，即可保证良好的体系粘度，便于添加剂的均匀分散和涂布工艺的稳定控制，又可以节能降耗，减少排放。
需要说明的是，上述仅仅是本发明的较佳实施例，并非用来限定本发明的保护范围，在上述实施例的基础上所做出的等同变换均属于本发明的保护范围。

Claims (8)

1.一种透明抗静电压敏胶，其特征在于，所述的压敏胶中各组分的重量份数如下：多元醇和多异氰酸酯的混合物1000重量份，催化剂0.8重量份，扩链剂5～30重量份，交联剂120～200重量份，抗静电剂10～50重量份，所述的多元醇和多异氰酸酯的混合物中异氰酸酯基与羟基的摩尔比为1.95～2:1；
所述的多元醇为聚酯二元醇、聚醚二元醇中的一种。
2.根据权利要求1所述的透明抗静电压敏胶，其特征在于，所述的聚酯二元醇的分子量优选为500～3000，所述的聚醚二元醇的分子量优选为3000～5000。
3.根据权利要求1所述的透明抗静电压敏胶，其特征在于，所述的多异氰酸酯为六亚甲基二异氰酸酯（HDI）、异佛尔酮二异氰酸酯(IPDI)中的一种或者两种以任意比例的混合物。
4.根据权利要求1所述的透明抗静电压敏胶，其特征在于，所述的催化剂为二桂酸二丁基锡，所述的扩链剂为三羟甲基丙烷，所述的交联剂为氨基树脂，所述的抗静电剂为三氟甲磺酸锂。
5.根据权利要求1所述的透明抗静电压敏胶，其特征在于，所述的压敏胶需要在溶剂中反应，所述的溶剂为醋酸丁酯和环己酮的混合物，溶剂中醋酸丁酯与环己酮的重量比为1:1。
6.一种根据权利要求1-5所述的透明抗静电压敏胶的生产方法，其特征在于，所述的生产方法如下：
1）将相应重量的多元醇、异氰酸酯和溶剂加入反应釜中，在N2的保护下混合均匀；
2）将步骤1）的产品升温至50℃，加入相应重量的催化剂反应2h，降温至60℃，加入相应重量的扩链剂，在80℃下反应3小时，得到压敏胶A组分；
3）将步骤2）得到的压敏胶A组分中加入溶剂进行稀释，稀释后溶质的质量分数为18～24%，接着加入相应重量的交联剂和抗静电剂，混合均匀；
4）将步骤3）中得到产品进行涂布操作；
5）涂布操作后，将步骤4）的产品在120℃下保温1min，再经60℃下熟化48h，将溶剂挥发，最终制得具有抗静电性的压敏胶。
7.根据权利要求6所述的透明抗静电压敏胶的生产方法，其特征在于，所述的步骤1）的操作过程中，溶剂的用量与多元醇和多异氰酸酯的混合物的重量相同。
8.根据权利要求6所述的透明抗静电压敏胶的生产方法，其特征在于，所述的步骤4）的涂布操作中，涂布克数为10～30g/m2。
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