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    怎么选择合适水性环氧地坪固化剂?

    2018-11-04 06:33:42 无锡盛发地坪科技有限公司 阅读

    现在水性环氧地坪涂料越来越广泛的应用,作为环氧地坪涂料主导产品环氧树脂地坪涂料的先进品种,它的性能改进一直得到人们的重视,对成膜起重要作用的固化剂的选择最近又有新成果。据中国环氧树脂行业协会专家介绍,当用与环氧基反应的固化剂时,环氧值高的环氧树脂充分固化后的有效交联密度大。对腐蚀性介质通过涂膜有强的抵挡作用;环氧值低的环氧树脂则相反,但是过高的交联密度容易使涂膜发脆,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容易发挥,而且活性稀释剂本身又能直接参与与固化剂的反应不产生VOC。

    Nowadays, waterborne epoxy floor coatings are more and more widely used. As the leading product of floor coatings, the performance improvement of epoxy floor coatings has been paid attention to, and the selection of curing agents which play an important role in film formation has recently made new achievements. According to experts from China Epoxy Resin Industry Association, when curing agent reacting with epoxy group is used, the effective crosslinking density of epoxy resin with high epoxy value is high after fully curing. The epoxy resin with low epoxy value has the opposite effect, but it is easy to make the film brittle because of its high crosslinking density, so active diluent is added to the epoxy resin component. Active diluent can reduce the viscosity of paint, increase the mixability of curing agent components and epoxy resin components during construction, make the emulsifying function of curing agent to epoxy resin easier to play, and active diluent itself can directly participate in the reaction with curing agent without producing VOC. 

    水性环氧地坪

    Waterborne epoxy floor

    固化剂的选择对制备水性环氧地坪涂料至关重要。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认为,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,固化剂越容易向环氧树脂内扩散,有利于固化。

    The choice of curing agent is very important for the preparation of waterborne epoxy floor coatings. Waterborne epoxy coatings are multiphase systems, epoxy resins are dispersed phases, and curing agents are continuous phases (for water-soluble curing agents). Experts from China Epoxy Resin Industry Association believe that the curing process is controlled by diffusion. The curing reaction first occurs at the interface, and the surface viscosity of epoxy particles gradually increases. At the same time, the curing agent gradually diffuses into the epoxy resin, which further solidifies the epoxy resin. The smaller the particle size of epoxy emulsion, the closer the curing is; the better the compatibility between curing agent and epoxy resin, the easier the curing agent will diffuse into epoxy resin, which is beneficial to curing.

    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适用期短、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、漆膜性能不理想。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。国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性能,解决了溶剂性环氧地坪涂料湿面施工困难的问题。

    The commonly used waterborne curing agents are aliphatic amine adduct, alicyclic amine adduct, polyamide, polyamide adduct and so on. Aliphatic amine adduct and alicyclic amine adduct have short application period, too fast curing speed, and the surface viscosity of epoxy particles increases too fast. It is not conducive to the diffusion of curing agent to the depth of epoxy particles, incomplete curing and poor performance of film. The miscibility of polyamide curing agent and epoxy resin component is not good and there is induction period, which can be overcome by the adduct of polyamide resin. Water-soluble polyamide adduct is chosen as curing agent in China. The curing agent has good wettability on wet concrete base surface and can be cured by draining water. Even on wet base, it has good curing performance, which solves the problem of difficult construction of solvent epoxy floor coating on wet surface.


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