CN114133909A - 一种聚氨酯压敏胶保护膜及其制备方法 - Google Patents
一种聚氨酯压敏胶保护膜及其制备方法 Download PDFInfo
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Abstract
本发明涉及压敏胶保护膜技术领域,特别是涉及一种聚氨酯压敏胶保护膜的制备方法,包括如下步骤:S1、制备双羟基硅烷偶联剂;S2、制备双羟基硅烷偶联剂扩链的聚氨酯压敏胶;S3、制备双羟基硅烷偶联剂扩链的聚氨酯压敏胶保护膜。本发明提供一种聚氨酯压敏胶保护膜,其具有180℃剥离力稳定、耐水解、耐高温的特点。
Description
技术领域
本发明涉及压敏胶保护膜技术领域,特别是涉及一种聚氨酯压敏胶保护膜及其制备方法。
背景技术
在保护膜用压敏胶领域,胶粘剂的类型大致可分三类:聚丙烯酸酯类、聚氨酯类及有机硅类,三者进行对比:聚丙烯酸酯分子链主链为C-C单键,耐候性较好,但对温度敏感,“热粘冷脆”,用作保护膜时,为了追求低剥离力,往往添加大量的交联剂,使聚合物储能模量过高,导致保护膜有粉屑;硅胶类胶粘剂的耐温、耐候性较好,但其价格相对昂贵,限制了其进一步应用;聚氨酯类分子主链为软硬段交替的-(A-B)n-型嵌段结构,相比普通自由基聚合得到的分子链无规的聚丙烯酸酯,聚氨酯分子结构更明确,且由于含有聚醚的C-O-C结构,分子链更加柔软,克服了聚丙烯酸酯刮擦有粉屑的弊病,同时又比硅胶具备价格优势。然而,聚氨酯类压敏胶不免也存在一些缺陷,由于其分子结构中含有大量的氨基甲酸酯结构,导致其易水解,由其制作的保护膜在高温高湿环境中(85℃,85%RH)容易出现白雾或有油状物析出,残留在被保护材料表面,失去“保护”这一概念。
在现有方法中,往往通过物理共混一些碳化二亚胺类水解稳定剂,抑制水解,这样一来,却影响了聚氨酯压敏胶的其他性能,例如涂膜的外观发黄、有异味。
发明内容
为解决上述技术问题,本发明提供一种聚氨酯压敏胶保护膜,其具有180℃剥离力稳定、耐水解、耐高温的特点。
本发明还提供一种聚氨酯压敏胶保护膜的制备方法。
本发明采用如下技术方案:
一种聚氨酯压敏胶保护膜的制备方法,包括如下步骤:
S1、制备双羟基硅烷偶联剂:将多元醇、含异氰酸酯基团的硅烷偶联剂、催化剂I加到反应容器中,升温到50℃~70℃,机械搅拌,反应5~10小时,得到双羟基硅烷偶联剂;
S2、制备双羟基硅烷偶联剂扩链的聚氨酯压敏胶:将溶剂、多元醇、二异氰酸酯、步骤S1制备的双羟基硅烷偶联剂加入反应容器中,抽真空通氮气循环3次后置于油浴锅中70℃~80℃反应;反应结束后,得到分子主链为氨基甲酸酯结构,侧链含活性硅氧烷基团的聚氨酯压敏胶;
S3、制备双羟基硅烷偶联剂扩链的聚氨酯压敏胶保护膜:将催化剂II、固化剂加入到步骤S2制备的聚氨酯压敏胶中,搅拌均匀,经涂布装置均匀涂布在50μm PET膜上,然后再经过80℃-120℃程序升温装置烘烤2min,后期60℃熟化三天,制得聚氨酯压敏胶保护膜。
对上述技术方案的进一步改进为,在所述步骤S1中,所述多元醇为三羟甲基丙烷、三羟甲基三丙烯酸酯、丙三醇、三乙醇胺、聚酯三元醇、聚醚三元醇中的一种或几种;所述含异氰酸酯基团的硅烷偶联剂为3-异氰酸酯基丙基三甲氧基硅烷、3-异氰酸酯基丙基三乙氧基硅烷、3-异氰酸酯基丙基甲基二甲氧基硅烷、3-异氰酸酯基丙基甲基二乙氧基硅烷中的一种或几种。
对上述技术方案的进一步改进为,在所述步骤S1中,所述催化剂I为咪唑、2-甲基咪唑、三甲胺、三乙胺中的一种或几种。
对上述技术方案的进一步改进为,在所述步骤S1中,所述多元醇与含异氰酸酯基团的硅烷偶联剂的摩尔比为1:1;所述催化剂I的用量为多元醇与含异氰酸酯基团硅烷偶联剂的质量总量的0.1%~0.3%。
对上述技术方案的进一步改进为,在所述步骤S2中,所述溶剂为乙酸乙酯、乙酸丁酯、环己烷、甲苯中的一种或几种;所述溶剂的用量为聚氨酯压敏胶粘剂的质量总量的10%~50%。
对上述技术方案的进一步改进为,在所述步骤S2中,所述多元醇为聚酯二元醇、聚醚二元醇、聚四氢呋喃、三羟甲基丙烷、三羟甲基三丙烯酸酯、丙三醇、三乙醇胺、聚酯三元醇、聚醚三元醇、二羟甲基丙酸中的一种或几种;所述二异氰酸酯为六亚甲基二异氰酸、异佛尔酮二异氰酸酯、氢化苯基甲烷二异氰酸酯中的一种或几种。
对上述技术方案的进一步改进为,在所述步骤S2中,所述多元醇、双羟基硅烷偶联剂、二异氰酸酯中的官能团摩尔比为1.1~2;所述双羟基硅烷偶联剂占羟基组分摩尔总量的0.5%-10%。
对上述技术方案的进一步改进为,在所述步骤S3中,所述催化剂II为二月桂酸丁基锡、辛酸亚锡、二醋酸二丁基锡中的一种或几种。
对上述技术方案的进一步改进为,在所述步骤S3中,所述固化剂为乙酰丙酮铝、全醚化氨基树脂、多异氰酸酯中的一种或几种。
一种聚氨酯压敏胶保护膜,所述聚氨酯压敏胶保护膜使用上述的制备方法制得。
本发明的有益效果为:
本发明从分子结构设计出发,在聚氨酯压敏胶分子链上引入活性硅氧烷基团,其与水分可反应形成致密的Si-O-Si交联结构,阻挡水分对聚氨酯分子主链的水解,同时Si-O键高的键能增强了聚氨酯的耐热性,使本发明制备的聚氨酯压敏胶保护膜具有180℃剥离力稳定、耐水解、耐高温的特点。
具体实施方式
为更好地理解本发明,下面结合实施例对本发明作进一步说明,但是本发明的实施方式不限于此。
一种聚氨酯压敏胶保护膜的制备方法,包括如下步骤:
S1、制备双羟基硅烷偶联剂:将多元醇、含异氰酸酯基团的硅烷偶联剂、催化剂I加到反应容器中,升温到50℃~70℃,机械搅拌,反应5~10小时,得到双羟基硅烷偶联剂;
S2、制备双羟基硅烷偶联剂扩链的聚氨酯压敏胶:将溶剂、多元醇、二异氰酸酯、步骤S1制备的双羟基硅烷偶联剂加入反应容器中,抽真空通氮气循环3次后置于油浴锅中70℃~80℃反应;反应结束后,得到分子主链为氨基甲酸酯结构,侧链含活性硅氧烷基团的聚氨酯压敏胶;
S3、制备双羟基硅烷偶联剂扩链的聚氨酯压敏胶保护膜:将催化剂II、固化剂加入到步骤S2制备的聚氨酯压敏胶中,搅拌均匀,经涂布装置均匀涂布在50μm PET膜上,然后再经过80℃-120℃程序升温装置烘烤2min,后期60℃熟化三天,制得聚氨酯压敏胶保护膜。
在所述步骤S1中,所述多元醇为三羟甲基丙烷、三羟甲基三丙烯酸酯、丙三醇、三乙醇胺、聚酯三元醇、聚醚三元醇中的一种或几种;所述含异氰酸酯基团的硅烷偶联剂为3-异氰酸酯基丙基三甲氧基硅烷、3-异氰酸酯基丙基三乙氧基硅烷、3-异氰酸酯基丙基甲基二甲氧基硅烷、3-异氰酸酯基丙基甲基二乙氧基硅烷中的一种或几种。
在所述步骤S1中,所述催化剂I为咪唑、2-甲基咪唑、三甲胺、三乙胺中的一种或几种。
在所述步骤S1中,所述多元醇与含异氰酸酯基团的硅烷偶联剂的摩尔比为1:1;所述催化剂I的用量为多元醇与含异氰酸酯基团硅烷偶联剂的质量总量的0.1%~0.3%。
在所述步骤S2中,所述溶剂为乙酸乙酯、乙酸丁酯、环己烷、甲苯中的一种或几种;所述溶剂的用量为聚氨酯压敏胶粘剂的质量总量的10%~50%。
在所述步骤S2中,所述多元醇为聚酯二元醇、聚醚二元醇、聚四氢呋喃、三羟甲基丙烷、三羟甲基三丙烯酸酯、丙三醇、三乙醇胺、聚酯三元醇、聚醚三元醇、二羟甲基丙酸中的一种或几种;所述二异氰酸酯为六亚甲基二异氰酸、异佛尔酮二异氰酸酯、氢化苯基甲烷二异氰酸酯中的一种或几种。
在所述步骤S2中,所述多元醇、双羟基硅烷偶联剂、二异氰酸酯中的官能团摩尔比(OH/NCO)为1.1~2;所述双羟基硅烷偶联剂占羟基组分摩尔总量的0.5%-10%。
在所述步骤S3中,所述催化剂II为二月桂酸丁基锡、辛酸亚锡、二醋酸二丁基锡中的一种或几种。
在所述步骤S3中,所述固化剂为乙酰丙酮铝、全醚化氨基树脂、多异氰酸酯中的一种或几种。
一种聚氨酯压敏胶保护膜,所述聚氨酯压敏胶保护膜使用上述的制备方法制得。
实施例1
(1)含双羟基硅烷偶联剂的制备
向装有温度计、搅拌桨的三口烧瓶中加入三羟甲基丙烷8.00g(0.059mol),3-异氰酸酯基丙基三甲氧基硅烷12.22g(0.059mol),催化剂咪唑0.04g,机械搅拌,油浴升温到70℃反应。利用傅里叶变换红外光谱仪监测3-异氰酸酯基丙基三甲氧基硅烷的转化率,反应至红外光谱中波数在2270cm-1附近NCO的红外伸缩振动峰消失,得到双羟基硅烷偶联剂。
(2)双羟基硅烷偶联剂扩链的聚氨酯压敏胶的制备
向装有温度计、搅拌桨的三口烧瓶中加入聚丙二醇(平均M=2000)50.00g(0.025mol),(1)制备的双羟基硅烷偶联剂0.5g(0.0014mol),六亚甲基二异氰酸酯2.22g(0.0132mol),甲苯52.72g,抽真空通氮气循环3次后置于80℃油浴锅中反应,利用二正丁胺滴定法监测六亚甲基二异氰酸酯的转化率,当其转化率达理论值后,结束反应,得固含量为50%的透明粘稠液体。
(3)双羟基硅烷偶联剂扩链的聚氨酯压敏胶保护膜的制备
称取(2)制备的聚氨酯压敏胶50g,固化剂多异氰酸酯(HDI三聚体)5g,催化剂辛酸亚锡0.05g,搅拌混合均匀,经涂布装置均匀涂布在50umPET膜上,然后再经过80℃-120℃程序升温装置烘烤2min,后期60℃熟化三天,制得聚氨酯压敏胶保护膜。
实施例2
(1)含双羟基硅烷偶联剂的制备
向装有温度计、搅拌桨的三口烧瓶中加入聚醚303(三官能度聚丙二醇,平均M=300)30g(0.1mol),3-异氰酸酯基丙基三乙氧基硅烷24.7g(0.1mol),催化剂三乙胺0.16g,机械搅拌,油浴升温到70℃反应。利用傅里叶变换红外光谱仪监测3-异氰酸酯基丙基三甲氧基硅烷的转化率,反应至红外光谱中波数在2270cm-1附近NCO的红外伸缩振动峰消失,得到双羟基硅烷偶联剂。
(2)双羟基硅烷偶联剂扩链的聚氨酯压敏胶的制备
向装有温度计、搅拌桨的三口烧瓶中加入聚丙二醇(平均M=1000)50.00g(0.05mol),(1)制备的双羟基硅烷偶联剂2.50g(0.0045mol),异佛尔酮二异氰酸酯8.00g(0.036mol),甲苯60.50g,抽真空通氮气循环3次后置于80℃油浴锅中反应,利用二正丁胺滴定法监测异佛尔酮二异氰酸酯的转化率,当其转化率达理论值后,结束反应,得固含量为50%的透明粘稠液体。
(3)双羟基硅烷偶联剂扩链的聚氨酯压敏胶保护膜的制备
称取(2)制备的聚氨酯压敏胶50g,固化剂全醚化氨基树脂5g,催化剂二月桂酸丁基锡0.05g,搅拌混合均匀,经涂布装置均匀涂布在50umPET膜上,然后再经过80℃-120℃程序升温装置烘烤2min,后期60℃熟化三天,制得聚氨酯压敏胶保护膜。
比较例1
聚氨酯压敏胶的制备
向装有温度计、搅拌桨的三口烧瓶中加入聚丙二醇(平均M=1000)50.00g(0.05mol),异佛尔酮二异氰酸酯7.41g(0.033mol),甲苯57.41g,抽真空通氮气循环3次后置于80℃油浴锅中反应,利用二正丁胺滴定法监测异佛尔酮二异氰酸酯的转化率,当其转化率达理论值后,结束反应,得固含量为50%的透明粘稠液体。
聚氨酯压敏胶保护膜的制备
称取上述制备的聚氨酯压敏胶50g,固化剂全醚化氨基树脂5g,催化剂二月桂酸丁基锡0.05g,搅拌混合均匀,经涂布装置均匀涂布在50umPET膜上,然后再经过80℃-120℃程序升温装置烘烤2min,后期60℃熟化三天,制得聚氨酯压敏胶保护膜。
下面分别对实施例1、2,比较例1进行180℃剥离力(GB/T 2792-2014)、高温高湿试验(样品贴合玻璃板后,置于温度85℃,湿度85%三天,撕下保护膜,检查玻璃板表面是否有析出物或起白雾),相关数据如下表1所示:
表1
样品 | 180℃剥离力(g/25mm) | 高温高湿试验 |
实施例1 | 2.45 | 外观洁净 |
实施例2 | 2.39 | 外观洁净 |
比较例1 | 8.68 | 油状物析出 |
本发明从分子结构设计出发,在聚氨酯压敏胶分子链上引入活性硅氧烷基团,其与水分可反应形成致密的Si-O-Si交联结构,阻挡水分对聚氨酯分子主链的水解,同时Si-O键高的键能增强了聚氨酯的耐热性,使本发明制备的聚氨酯压敏胶保护膜具有180℃剥离力稳定、耐水解、耐高温的特点。
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对本发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。
Claims (10)
1.一种聚氨酯压敏胶保护膜的制备方法,其特征在于,包括如下步骤:
S1、制备双羟基硅烷偶联剂:将多元醇、含异氰酸酯基团的硅烷偶联剂、催化剂I加到反应容器中,升温到50℃~70℃,机械搅拌,反应5~10小时,得到双羟基硅烷偶联剂;
S2、制备双羟基硅烷偶联剂扩链的聚氨酯压敏胶:将溶剂、多元醇、二异氰酸酯、步骤S1制备的双羟基硅烷偶联剂加入反应容器中,抽真空通氮气循环3次后置于油浴锅中70℃~80℃反应;反应结束后,得到分子主链为氨基甲酸酯结构,侧链含活性硅氧烷基团的聚氨酯压敏胶;
S3、制备双羟基硅烷偶联剂扩链的聚氨酯压敏胶保护膜:将催化剂II、固化剂加入到步骤S2制备的聚氨酯压敏胶中,搅拌均匀,经涂布装置均匀涂布在50μm PET膜上,然后再经过80℃-120℃程序升温装置烘烤2min,后期60℃熟化三天,制得聚氨酯压敏胶保护膜。
2.根据权利要求1所述的聚氨酯压敏胶保护膜的制备方法,其特征在于,在所述步骤S1中,所述多元醇为三羟甲基丙烷、三羟甲基三丙烯酸酯、丙三醇、三乙醇胺、聚酯三元醇、聚醚三元醇中的一种或几种;所述含异氰酸酯基团的硅烷偶联剂为3-异氰酸酯基丙基三甲氧基硅烷、3-异氰酸酯基丙基三乙氧基硅烷、3-异氰酸酯基丙基甲基二甲氧基硅烷、3-异氰酸酯基丙基甲基二乙氧基硅烷中的一种或几种。
3.根据权利要求1所述的聚氨酯压敏胶保护膜的制备方法,其特征在于,在所述步骤S1中,所述催化剂I为咪唑、2-甲基咪唑、三甲胺、三乙胺中的一种或几种。
4.根据权利要求1所述的聚氨酯压敏胶保护膜的制备方法,其特征在于,在所述步骤S1中,所述多元醇与含异氰酸酯基团的硅烷偶联剂的摩尔比为1:1;所述催化剂I的用量为多元醇与含异氰酸酯基团硅烷偶联剂的质量总量的0.1%~0.3%。
5.根据权利要求1所述的聚氨酯压敏胶保护膜的制备方法,其特征在于,在所述步骤S2中,所述溶剂为乙酸乙酯、乙酸丁酯、环己烷、甲苯中的一种或几种;所述溶剂的用量为聚氨酯压敏胶粘剂的质量总量的10%~50%。
6.根据权利要求1所述的聚氨酯压敏胶保护膜的制备方法,其特征在于,在所述步骤S2中,所述多元醇为聚酯二元醇、聚醚二元醇、聚四氢呋喃、三羟甲基丙烷、三羟甲基三丙烯酸酯、丙三醇、三乙醇胺、聚酯三元醇、聚醚三元醇、二羟甲基丙酸中的一种或几种;所述二异氰酸酯为六亚甲基二异氰酸、异佛尔酮二异氰酸酯、氢化苯基甲烷二异氰酸酯中的一种或几种。
7.根据权利要求1所述的聚氨酯压敏胶保护膜的制备方法,其特征在于,在所述步骤S2中,所述多元醇、双羟基硅烷偶联剂、二异氰酸酯中的官能团摩尔比为1.1~2;所述双羟基硅烷偶联剂占羟基组分摩尔总量的0.5%-10%。
8.根据权利要求1所述的聚氨酯压敏胶保护膜的制备方法,其特征在于,在所述步骤S3中,所述催化剂II为二月桂酸丁基锡、辛酸亚锡、二醋酸二丁基锡中的一种或几种。
9.根据权利要求1所述的聚氨酯压敏胶保护膜的制备方法,其特征在于,在所述步骤S3中,所述固化剂为乙酰丙酮铝、全醚化氨基树脂、多异氰酸酯中的一种或几种。
10.一种聚氨酯压敏胶保护膜,其特征在于,所述聚氨酯压敏胶保护膜使用如权利要求1-9任一项所述的制备方法制得。
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CN118325520B (zh) * | 2024-03-27 | 2024-10-25 | 佛山市顺德区冠叶建材实业有限公司 | 一种pvc管材用高强度胶黏剂的制备方法 |
CN118126659A (zh) * | 2024-05-06 | 2024-06-04 | 迪马新材料科技(苏州)有限公司 | 压敏胶及其制备方法和压敏胶制品 |
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