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中山艾爾福德地坪工程有限公司告訴您水性環(huán)氧地坪固化劑的選擇

固化劑的選擇對制備水性環(huán)氧地坪涂料至關(guān)重要。水性環(huán)氧涂料為多相體系，環(huán)氧樹脂為分散相，固化劑為連續(xù)相(對水溶性固化劑而言)。中國環(huán)氧樹脂行業(yè)協(xié)專家以為，其固化過程由擴(kuò)散控制，固化反應(yīng)首先在界面上發(fā)生，環(huán)氧顆粒表層的黏度逐漸增大，同時(shí)固化劑逐漸擴(kuò)散到環(huán)氧樹脂中，進(jìn)一步使環(huán)氧樹脂固化。環(huán)氧乳液顆粒粒徑越小，固化則越接近完全；固化劑與環(huán)氧樹脂相容性越好，固化劑越輕易向環(huán)氧地坪內(nèi)擴(kuò)散，有利于固化。常用的水性固化劑有脂肪胺加成物、脂環(huán)胺加成物、聚酰胺、聚酰胺加成物等。脂肪胺加成物和脂環(huán)胺加成物合用期短、固化速度太快，環(huán)氧顆粒表層黏度上升過快。不利于固化劑向環(huán)氧顆粒深處擴(kuò)散，固化不完全、漆膜機(jī)能不理想。聚酰胺固化劑與環(huán)氧樹脂組分混溶性不好且存在誘導(dǎo)期，用聚酰胺樹脂的加成物則可克服這一缺點(diǎn)。海內(nèi)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機(jī)能，解決了溶劑性環(huán)氧地坪涂料濕面施工難題的題目。

據(jù)中國環(huán)氧樹脂行業(yè)協(xié)汕頭管道清通會專家先容，當(dāng)用與環(huán)氧基反應(yīng)的固化劑時(shí)，環(huán)氧值高的環(huán)氧地坪充分固化后的有效交聯(lián)密度大。對侵蝕性介質(zhì)通過涂膜有強(qiáng)的抵抗作用；環(huán)氧值低的環(huán)氧樹脂則相反，但是過高的交聯(lián)密度輕易使涂膜發(fā)脆，所以在環(huán)氧樹脂組分中加入了活性稀釋劑?；钚韵♂寗┠芙档推崃橡ざ?，增加施工時(shí)固化劑組分與環(huán)氧樹脂組分的易混勻性，使固化劑對環(huán)氧樹脂的乳化功能更輕易施展，而且活性稀釋劑本身又能直接介入與固化劑的反應(yīng)不產(chǎn)生VOC。

水性環(huán)氧地坪涂料正在得到越來越廣泛的應(yīng)用，作為地坪涂料主導(dǎo)產(chǎn)品環(huán)氧樹脂基的地坪涂料的提高前輩品種，它的機(jī)能改進(jìn)一直得到人們的正視，對成膜起重要作用的固化劑的選擇研究近又有新成果。

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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