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UV固化聚氨酯丙烯酸酯水性乳液的合成及应用
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摘要
为响应二十一世纪高效、节能、绿色和环保的时代主题,水性紫外光固化体系以其无毒性、无污染、无刺激性和生产安全等优点,在众多的固化体系中脱颖而出,是目前较为活跃的研究和开发领域。
     本文以甲苯二异氰酸酯(MDI)、聚醚二元醇(PO3114)、二羟甲基丙酸(DMPA)、丙烯酸羟乙酯(HEA)和三乙胺(TEA)为原料,通过三步法合成了亲水性优异,能进行紫外光固化的阴离子型水性聚氨酯丙烯酸酯(WPUA),并将其乳化制得水性PUA乳液。
     研究了水性聚氨酯丙烯酸酯树脂及其乳液的合成,确定了水性上光油和油墨的配方。讨论了光引发剂的种类和用量、中和剂种类、中和度、固含量以及反应物配比对光固化速度的影响,同时对光固化膜的性能进行了测定,并讨论了亲水基团含量、中和度、固含量和异氰酸指数(R值)对乳液性能的影响。
     结果表明:随亲水基团含量和中和度的提高,分子链亲水性增强,乳液粒径下降,乳液的分散性、稳定性均得到提高;在光固化性能方面,光引化剂优选Darocur4265,最佳用量为2%,中和度为80%时光固化速度最快;用NaOH作为中和剂时光固化速度快于三乙胺(TEA),但乳化不完全。反应物的最佳配比为n(TDI):n(PO3114):n(HEA): n(DMPA)=6:2:4:3;合成树脂的固化膜具有良好的耐水、耐溶剂和耐酸性,但耐强碱性较差。
     在上光油配方的合成中,随固含量的提高,粘度上升,固化膜的光泽度先增加,后略微下降,光固化时间先增加后减小,固含量在70%-80%之间最为合适;pH值太高,粘度降低,光泽度降低,pH值太低,碱性太弱,粘度太高,光泽度降低,pH值在8-9最为合适;在油墨配方的合成中,固含量越高,固化速度越快;颜料对光引发剂存在屏蔽作用;比热容较小的基材会加快光固化速度。
In response to the 21st century high efficiency,energy saving,green and environmental protection,water-borne UV curable system stands out in numerous curing system,with non- toxic,non-polluting,without excitant and production safety advantages,which is relatively active research and development fields.
     This paper introduce that an excellent hydrophilic and ionic UV-curing water-borne polyurethane acrylates (WPUA) was synthesized through the three-step synthesis method, with toluene disocyanate(TDI),polyether glycol(PO3114),dimethylol propionic acid(DMPA), hydroxyethyl acrylate(HEA) and triethylamine(TEA),which was made the water-borne poly- urethane acrylate emulsion.
     The water-borne polyurethane acrylates emulsion(WPUA),water-based polish oil and ink formulations were studied. Photoinitiators’type and dosage,neutralizer’s type,neutralization degree,solid content and the ratio of reactants were discussed on the speed of light curing, meanwhile the performance of light curing film was studied,and the content of hydrophilic groups,neutralization degree,solid content and the isocyanate index (R value) were discussed on the properties of emulsion.
     The results showed that:the molecular chain hydrophilic enhanced,emulsion particle size declined,the dispersion and stability improved with hydrophilic groups content and neu- tralization degree rising;In light-cured properties,Darocur4265 is the best photoinitiator,and optimum dosage is 2%,the light-cured speed is the fastest when neutralization degree is 80%;The light-cured speed with NaOH as neutralizer is faster than triethylamine (TEA), But not emulsified completely.For the best ratio of reactants is that:n(TDI):n(PO3114):n(HEA): n(DMPA)=6:2:4:3.The cured film of synthetic resin has good water, solvent and acid resis- tance,but alkali resistant is bad.
     In the determination of the polish oil formulation,when the solid content increased,the viscosity increased,the gloss of the cured film first increased,then decreased slightly,the light curing time increases firstly and then decreased,and solid content in the most appropriate is between 70 to 80 percent;The pH value is too high,viscosity reduced,gloss reduced,while pH value too low,alkaline weaken,viscosity higher,gloss reduced,The most appropriate pH value is 8-9.In the determination of ink formulations, the higher the solid content,the faster the cure; The pigment exist shield effect on light initiator;The base material that have smaller heat capacity will speed up the light-curing rate.
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