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汕头潮阳嘉文清通公司告诉您水性环氧清通固化剂的选择

固化剂的选择对制备水性环氧清通涂料至关重要。水性环氧涂料为多相体系,环氧树脂为分散相,固化剂为连续相(对水溶性固化剂而言)。中国环氧树脂行业协专家以为,其固化过程由扩散控制,固化反应首先在界面上发生,环氧颗粒表层的黏度逐渐增大,同时固化剂逐渐扩散到环氧树脂中,进一步使环氧树脂固化。环氧乳液颗粒粒径越小,固化则越接近完全;固化剂与环氧树脂相容性越好,固化剂越轻易向环氧清通内扩散,有利于固化。常用的水性固化剂有脂肪胺加成物、脂环胺加成物、聚酰胺、聚酰胺加成物等。脂肪胺加成物和脂环胺加成物合用期短、固化速度太快,环氧颗粒表层黏度上升过快。不利于固化剂向环氧颗粒深处扩散,固化不完全、漆膜机能不理想。聚酰胺固化剂与环氧树脂组分混溶性不好且存在诱导期,用聚酰胺树脂的加成物则可克服这一缺点。海内选用水溶性的聚酰胺加成物作为本体系的固化剂,该固化剂对湿混凝土基面的润湿性良好,能排开水固化。即使在较湿的基面也有很好的固化机能,解决了溶剂性环氧清通涂料湿面施工难题的题目。

石家庄叉车租赁

据中国环氧树脂行业协汕头潮阳管道清通会专家先容,当用与环氧基反应的固化剂时,环氧值高的环氧清通充分固化后的有效交联密度大。对侵蚀性介质通过涂膜有强的抵抗作用;环氧值低的环氧树脂则相反,但是过高的交联密度轻易使涂膜发脆,所以在环氧树脂组分中加入了活性稀释剂。活性稀释剂能降低漆料黏度,增加施工时固化剂组分与环氧树脂组分的易混匀性,使固化剂对环氧树脂的乳化功能更轻易施展,而且活性稀释剂本身又能直接介入与固化剂的反应不产生VOC。

水性环氧清通涂料正在得到越来越广泛的应用,作为清通涂料主导产品环氧树脂基的清通涂料的提高前辈品种,它的机能改进一直得到人们的正视,对成膜起重要作用的固化剂的选择研究近又有新成果。

The choice of curing agent on the preparation of waterborne epoxy floor coating is very important. Waterborne epoxy coatings for multiphase system, epoxy resin as the dispersed phase, curing agent for the continuous phase (for water-soluble curing agent). China epoxy resin industry association experts thought that the curing process is controlled by diffusion, curing reaction in the first place in the interface, the viscosity of epoxy particle surface increases gradually, at the same time curing agent gradually spread to the epoxy resin, to further make the epoxy resin curing. Curing epoxy emulsion particle size is smaller, the closer the completely; Curing agent has better compatibility with epoxy resin, curing agent, the more easily spread to epoxy resin, curing. Commonly used water curing agent have fatty amine adduct, alicyclic amine adduct, polyamide, polyamide adduct, etc. Aliphatic amine adduct and alicyclic amine adduct share period is short, fast curing rate, particle surface viscosity of epoxy rise too fast. Go against to epoxy curing agent particle diffusion depth, curing incomplete, film function is not ideal. Bad component mixing soluble polyamide curing agent with epoxy resin and induction period, with polyamide resin adduct can overcome this shortcoming. As the system of collecting with water soluble polyamide adduct curing agent, the curing agent of wet concrete base surface wettability is good, can discharge water curing. Even in the wet base also has a good function of curing, solved the solvent epoxy floor coating materials as the topic of the construction problems face wet.
According to the China epoxy resin industry association experts XianRong, when with the reaction of epoxy curing agent, epoxy value of high effective crosslinking density of the fully cured epoxy resin. By coating in corrosive media have a strong resistance; Low epoxy value of epoxy resin, by contrast, but high crosslinking density make the film easily brittle, so joined the active diluents in the epoxy resin composition. Reactive diluent can reduce paint viscosity, increase the construction curing agent ease of blending component with epoxy resin component, the function of curing agent for epoxy resin emulsion cast more easily, and active diluent itself can directly involved in the reaction of curing agent does not produce VOC.
Waterborne epoxy floor coatings are getting more and more widely used, as the dominant product of floor coating epoxy resin base floor coating improve predecessors variety, its function has been get people to face up to, to play a role in the film recently and achievements on the choice of curing agent.

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