CN110423549A - 水性聚氨酯环氧硅烷涂料及其制备方法 - Google Patents
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Abstract
本发明涉及聚氨酯涂料技术领域,具体涉及一种水性聚氨酯环氧硅烷涂料及其制备方法。本发明所述的水性聚氨酯环氧硅烷涂料,由以下质量份数的原料组成:A组分:聚四氢呋喃醚二醇100‑200份,甲苯‑2,4‑二异氰酸酯20‑100份,紫外线吸收剂1‑5份,防沉剂1‑10份,防结皮剂1‑10份,增塑剂1‑10份;B组分:环氧树脂50‑100份,硅烷偶联剂2‑10份,小分子醇类2‑15份,润湿分散剂5‑15份;A组分与B组分的混合质量比为1:1‑3。本发明的水性聚氨酯环氧硅烷涂料的涂膜耐腐蚀、硬度高、耐水性好、粘结力强,且具有良好的机械强度,解决了水性聚氨酯涂料的涂膜硬度差、耐水性差的问题。
Description
技术领域
本发明涉及聚氨酯涂料技术领域,具体涉及一种水性聚氨酯环氧硅烷涂料及其制备方法。
背景技术
传统的溶剂型双组分聚氨酯涂料因为具有优秀的物理力学性能和耐化学品性能,在高端建筑涂料领域中有广泛的应用。传统的溶剂型双组分聚氨酯涂料因为具有优秀的物理力学性能和耐化学品性能,在高端建筑涂料领域中有广泛的应用。而水性聚氨酯涂料以水为分散介质,最大限度地减少了有机溶剂(VOC)和有害空气污染物(HAP)的排放。经过多年发展,水性双组分聚氨酯涂料已经将高性能和低VOC相结合,成为当前涂料研究的热点和发展方向。
水性双组分聚氨酯涂料由含-OH基的水性多元醇和含-NCO基的多异氰酸酯固化剂组成。在设计涂料配方时,不仅要考虑固化后涂膜的性能指标,也需要充分考虑到现场施工的可操作性。理想的涂料产品应该兼具以下优良性能:(1)满足用户的功能需要;(2)优异的外观;(3)方便施工,易于混合,有足够长的可操作时间和比较短的表干时间,能够适应滚涂、喷涂等多种施工方法;(4)低毒或无毒,不易燃,能保障施工及使用安全;(5)适用面较宽,优异耐候及耐水性能等。合理选择成膜物是聚氨酯涂料实现高性能的前提。
将环氧树脂和聚氨酯同时用于制备水性涂料,能够显著改善水性涂料的各项性能。
专利CN109651922中公开了一种水性聚氨酯增韧水性环氧树脂防腐涂料及其制备方法,将制备好的水性聚氨酯和水性环氧树脂按一定比例混合,提高了水性涂料的韧性。但是该技术方案只是将两种水性涂料进行混合,并未将聚氨酯和环氧树脂进行相互改性,以获得更加优异的涂膜性能。
专利CN105238245中公开了一种环氧树脂改性的水性聚氨酯阻燃涂料及其制备方法,在制备水性聚氨酯乳液时加入环氧树脂,对水性聚氨酯乳液进行改性,提高了涂膜的硬度和耐水性。专利CN108707414中公开了一种环氧树脂改性聚氨酯防水涂料及其制备方法,利用聚二甲基硅氧烷、环氧树脂、聚氨酯相互交联改性,提高涂膜的结构稳定性和力学性能。以上研究均是用环氧树脂对聚氨酯进行改性,但是由于乳液相容性的限制,环氧树脂的加入量较少,未能明显改善涂膜的硬度、韧性和耐水性。
此外,现有技术大多是针对水性单组份聚氨酯涂料进行改性研究,关于水性双组分聚氨酯涂料的改性还鲜有报道。
发明内容
针对现有技术的不足,本发明的目的是提供一种水性聚氨酯环氧硅烷涂料,该涂料的涂膜耐腐蚀、硬度高、耐水性好、粘结力强,且具有良好的机械强度,解决了水性聚氨酯涂料的涂膜硬度差、耐水性差的问题;本发明还提供其制备方法。
本发明所述的水性聚氨酯环氧硅烷涂料,由A、B两组分组成;
A组分由以下质量份数的原料组成:
B组分由以下质量份数的原料组成:
A组分与B组分的混合质量比为1:1-3。
聚四氢呋喃醚二醇的分子量为250-3000。
紫外线吸收剂为紫外线吸收剂UV-327。
防沉剂优选为德谦WT-202。德谦WT-202是缔合型聚氨酯增稠剂,可提供水性体系良好的增稠及优异的流动、流平性,且对涂膜的耐水性、光泽影响小。
防结皮剂为甲乙酮肟。
增塑剂为植物酯环保增塑剂,由苏州伊格特化工有限公司生产。
环氧树脂为双酚A型环氧树脂,优选型号为E-55、E-51、E-44、E-12或E-06。
硅烷偶联剂为乙烯基三乙氧基硅烷、乙烯基三甲氧基硅烷或乙烯基三(β-甲氧乙氧基)硅烷。
小分子醇类为丙二醇、乙二醇或二乙二醇。
润湿分散剂优选为润湿分散剂WRS-2206。WRS-2206是一种氟改性的纤维素高分析化合物,具有优异的润滑性及表面流动与分散性能,与树脂的相溶性好,还具有防尘、防挂流的作用。
本发明所述的水性聚氨酯环氧硅烷涂料的制备方法,步骤如下:
(1)A组分:将聚四氢呋喃醚二醇在氮气保护下升温至110℃,脱水至水分含量低于0.02wt%,降温至80-100℃加入甲苯-2,4-二异氰酸酯(TDI)、紫外线吸收剂、防沉剂、防结皮剂和增塑剂,在80-100℃下反应2-3h,得到A组分,A组分的NCO质量含量为3-8%;
(2)B组分:将环氧树脂、硅烷偶联剂、小分子醇类和润湿分散剂在70℃条件下搅拌混合,得到B组分;
(3)将A组分和B组分按质量比1:1-3混合,得到水性聚氨酯环氧硅烷涂料。
与现有技术相比,本发明有以下有益效果:
本发明采用聚氨酯预聚体作为A组分,其含有的-NCO与B组分中小分子醇、环氧树脂中含有的-OH进行反应,固化得到涂膜,将聚氨酯和环氧树脂的优良特性进行结合,解决了水性聚氨酯涂料的涂膜硬度差、耐水性差的问题,制备的涂膜耐腐蚀、硬度高、耐水性好、粘结力强,且具有良好的机械强度。
具体实施方式
以下结合实施例对本发明做进一步说明,但本发明的保护范围不仅限于此,该领域专业人员对本发明技术方案所作的改变,均应属于本发明的保护范围内。
实施例1
(1)A组分:将100g聚四氢呋喃醚二醇(分子量250)加入三口烧瓶中,在氮气保护下升温至110℃,脱水至水分含量低于0.02wt%,降温至80℃,加入85gTDI、1g紫外线吸收剂UV-327、1g德谦WT-202、1g甲乙酮肟、1g植物酯环保增塑剂,在80℃下反应2h,得到A组分(NCO质量含量3.9%);
(2)B组分:将50g环氧树脂E-55、2g乙烯基三乙氧基硅烷、2g丙二醇、5g润湿分散剂WRS-2206在70℃条件下搅拌混合2h,得到B组分;
(3)将A组分和B组分按1:1混合,得到水性聚氨酯环氧硅烷涂料。
实施例2
(1)A组分:将150g聚四氢呋喃醚二醇(分子量1000)加入三口烧瓶中,在氮气保护下升温至110℃,脱水至水分含量低于0.02wt%,降温至90℃,加入34.5gTDI、1.5g紫外线吸收剂UV-327、3g德谦WT-202、3g甲乙酮肟、5g植物酯环保增塑剂,在90℃下反应2.5h,得到A组分;(NCO质量含量3.0%);
(2)B组分:将70g环氧树脂E-51、5g乙烯基三甲氧基硅烷、3g乙二醇、10g润湿分散剂WRS-2206在70℃条件下搅拌混合2.5h,得到B组分;
(3)将A组分和B组分按1:2混合,得到水性聚氨酯环氧硅烷涂料。
实施例3
(1)A组分:将200g聚四氢呋喃醚二醇(分子量3000)加入三口烧瓶中,在氮气保护下升温至110℃,脱水至水分含量低于0.02wt%,降温至100℃,加入27.5gTDI、2g紫外线吸收剂UV-327、4g德谦WT-202、4g甲乙酮肟、8g植物酯环保增塑剂,在100℃下反应3h,得到A组分;(NCO质量含量6.0%);
(2)B组分:将100g环氧树脂E-44、10g乙烯基三(β-甲氧乙氧基)硅烷、10g二乙二醇、15g润湿分散剂WRS-2206在70℃条件下搅拌混合3h,得到B组分;
(3)将A组分和B组分按1:3混合,得到水性聚氨酯环氧硅烷涂料。
对比例1
购买市售产品防水涂料SPUA-352。
将实施例1-3和对比例的产品进行性能测试,测试结果如表1所示:
表1实施例1-3和对比例的产品性能测试结果
Claims (10)
1.一种水性聚氨酯环氧硅烷涂料,其特征在于:由A、B两组分组成;
A组分由以下质量份数的原料组成:
B组分由以下质量份数的原料组成:
A组分与B组分的混合质量比为1:1-3。
2.根据权利要求1所述的水性聚氨酯环氧硅烷涂料,其特征在于:聚四氢呋喃醚二醇的分子量为250-3000。
3.根据权利要求1所述的水性聚氨酯环氧硅烷涂料,其特征在于:紫外线吸收剂为紫外线吸收剂UV-327;防沉剂为德谦WT-202;防结皮剂为甲乙酮肟。
4.根据权利要求1所述的水性聚氨酯环氧硅烷涂料,其特征在于:增塑剂为植物酯环保增塑剂。
5.根据权利要求1所述的水性聚氨酯环氧硅烷涂料,其特征在于:环氧树脂为双酚A型环氧树脂。
6.根据权利要求1所述的水性聚氨酯环氧硅烷涂料,其特征在于:硅烷偶联剂为乙烯基三乙氧基硅烷、乙烯基三甲氧基硅烷或乙烯基三(β-甲氧乙氧基)硅烷。
7.根据权利要求1所述的水性聚氨酯环氧硅烷涂料,其特征在于:小分子醇类为丙二醇、乙二醇或二乙二醇。
8.根据权利要求1所述的水性聚氨酯环氧硅烷涂料,其特征在于:润湿分散剂优选为润湿分散剂WRS-2206。
9.一种权利要求1-8任一项所述的水性聚氨酯环氧硅烷涂料的制备方法,其特征在于,步骤如下:
(1)A组分:将聚四氢呋喃醚二醇在氮气保护下升温至110℃,脱水至水分含量低于0.02wt%,降温至80-100℃加入甲苯-2,4-二异氰酸酯(TDI)、紫外线吸收剂、防沉剂、防结皮剂和增塑剂,在80-100℃下反应2-3h,得到A组分;
(2)B组分:将环氧树脂、硅烷偶联剂、小分子醇类和润湿分散剂在70℃条件下搅拌混合,得到B组分;
(3)将A组分和B组分按质量比1:1-3混合,得到水性聚氨酯环氧硅烷涂料。
10.根据权利要求9所述的水性聚氨酯环氧硅烷涂料的制备方法,其特征在于:A组分的NCO质量含量为3-8%。
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