怎麼選擇合適水性环氧地坪固化劑？

現在水性环氧地坪塗料越來越廣泛的應用，作為环氧地坪塗料主導產品环氧樹脂地坪塗料的先進品種，它的性能改進一直得到人們的重視，對成膜起重要作用的固化劑的選擇最近又有新成果。據中國环氧樹脂行業協會專傢介紹，當用與环氧基反應的固化劑時，环氧值高的环氧樹脂充分固化後的有效交聯密度大。對腐蝕性介質通過塗膜有強的抵擋作用；环氧值低的环氧樹脂則相反，但是過高的交聯密度容易使塗膜發脆，所以在环氧樹脂組分中加入瞭活性稀釋劑。活性稀釋劑能降低漆料黏度，增加施工時固化劑組分與环氧樹脂組分的易混勻性，使固化劑對环氧樹脂的乳化功印花地坪能更容易發揮，而且活性稀釋劑本身又能直接參與與固化劑的反應不產生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环氧地坪 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
固化劑的選擇對制備水性环氧地坪塗料至關重要。水性环氧塗料為多相體系，环氧樹脂為分散相，固化劑為連續相(對水溶性固化劑而言)。中國环氧樹脂行業協專傢認為，其固化過程由擴散控制，固化反應首先在界面上發生，环氧顆粒表層的黏度逐漸增大，同時固化劑逐漸擴散到环氧樹脂中，進一步使环氧樹脂固化。环氧乳液顆粒粒徑越小，固化則越接近完全；固化劑與环氧樹脂相容性越好，固化劑越容易向环氧樹脂內擴散，有利於固化。
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.
常用的水性固化劑有脂肪胺加成物、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適用期短、固化速度太快，环氧顆粒表層黏度上升過快。不利於固化劑向环氧顆粒深處擴散，固化不完全、漆膜性能不理想。聚酰胺固化劑與环氧樹脂組分混溶性不好且存在誘導期，用聚酰胺樹脂的加成物則可克服這一缺點。國內選用水溶性的聚酰胺加成物作為本體系的固化劑，該固化劑對濕混凝土基面的潤濕性良好，能排開水固化。即使在較濕的基面也有很好的固化性能，解決瞭溶劑性环氧地坪塗料濕面施工困難的問題。
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.