Preparation and properties of surface modified GO modified amine-free waterborne polyurethane-acrylate emulsion

doi:10.16085/j.issn.1000-6613.2019-1120

Abstract

Abstract:

A waterborne polyurethane-acrylate emulsion (WPUA) prepolymer was synthesized using isophorone diisocyanate (IPDI), polycaprolactone diol (PCL) and methyl methacrylate as main raw materials. The graphene oxide was intercalated with dodecyltrimethylammonium bromide to mechanically blend the modified product with the prepolymer, and the carboxylic acid type hydrophilic chain extender and the sulfonic acid type hydrophilic group were simultaneously introduced. The self-emulsification method was used to synthesize solvent-free, zero VOC-modified waterborne polyurethane-acrylate composite emulsion (DTGO/WPUA), and then the amount of modified graphene oxide (DTGO) was studied, and the composite emulsion and film were tested and characterized. The results indicated that the DTGO composite modified waterborne polyurethane coatings showed good mechanical properties and heat resistance. When the amount of DTGO was 0.8%, the tensile strength of the composite film was increased to 48.5MPa compared to the unmodified waterborne polyurethane film, and the thermal decomposition temperature was increased by 21℃.

Key words: waterborne polyurethane-acrylate, graphene oxide, intercalation modification, mechanical blending, thermal decomposition

摘要：

以异佛尔酮二异氰酸酯（IPDI）、聚己内酯二元醇（PCL）、甲基丙烯酸甲酯（MMA）为主要原料，合成水性聚氨酯-丙烯酸酯乳液（WPUA）预聚体，利用十二烷基三甲基溴化铵对氧化石墨烯进行插层改性，改性产物与预聚体进行机械共混，同时引入羧酸型亲水扩链剂和磺酸型亲水扩链剂，采用自乳化法合成无溶剂、零VOC型改性的水性聚氨酯-丙烯酸酯复合乳液（DTGO/WPUA），研究改性氧化石墨烯（DTGO）用量，并对复合乳液和胶膜进行测试和表征。研究结果表明：DTGO复合材料改性水性聚氨酯涂料表现出较好的力学性能和耐热性。当DTGO用量为质量分数0.8%时，相比未改性的水性聚氨酯胶膜，复合胶膜拉伸强度提高到48.5MPa，热分解温度提高21℃。

关键词: 水性聚氨酯-丙烯酸酯, 氧化石墨烯, 插层改性, 机械共混, 热分解

CLC Number:

TQ323.8

Xiaojuan LAI,Yinyin ZHANG,Jiahui LIU,Lei WANG. Preparation and properties of surface modified GO modified amine-free waterborne polyurethane-acrylate emulsion[J]. Chemical Industry and Engineering Progress, 2020, 39(4): 1389-1395.

赖小娟,张引引,刘佳慧,王磊. 表面修饰GO改性无胺型水性聚氨酯-丙烯酸酯乳液制备与性能[J]. 化工进展, 2020, 39(4): 1389-1395.

Figures/Tables 10

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编号	乳液外观	贮存稳定性（＞30d）	胶膜状态
DTGO/WPUA-0%	透明蓝光	稳定	光滑平整、柔软
DTGO/WPUA-0.3%	浅黑	稳定	光滑平整、柔软
DTGO/WPUA-0.6%	浅黑	稳定	光滑平整、稍硬
DTGO/WPUA-0.8%	浅黑	稳定	光滑平整、较硬
DTGO/WPUA-1%	浅黑出现沉淀	不稳定	不成膜

编号	乳液外观	贮存稳定性（＞30d）	胶膜状态
DTGO/WPUA-0%	透明蓝光	稳定	光滑平整、柔软
DTGO/WPUA-0.3%	浅黑	稳定	光滑平整、柔软
DTGO/WPUA-0.6%	浅黑	稳定	光滑平整、稍硬
DTGO/WPUA-0.8%	浅黑	稳定	光滑平整、较硬
DTGO/WPUA-1%	浅黑出现沉淀	不稳定	不成膜

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