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    提升环氧地坪漆漆膜的湿附着力的施工方法

    2019-09-01 08:36:43 无锡盛发地坪科技有限公司 阅读

    起屏蔽作用的环氧地坪漆底漆要具有优异的湿附着力,而且这种环氧地坪漆底漆要彻底地渗进环氧地坪表面的微细缝隙中。提高环氧地坪漆漆膜的湿附着力可以着重从以下几个方面进行。涂装前必须清洁环氧地坪表面,除去任何油污和盐。环氧地坪表面最好进行处理,生成磷酸盐膜,随后进行电泳涂底漆,环氧地坪漆漆膜则表现出优异的湿附着力。

    The shielding epoxy floor varnish primer should have excellent wet adhesion, and the epoxy floor varnish primer should penetrate into the tiny cracks on the surface of the epoxy floor thoroughly. Improving the wet adhesion of epoxy floor paint film can focus on the following aspects. The surface of the epoxy floor must be cleaned before painting, and any oil and salt must be removed. The surface of epoxy flooring is best treated to form phosphate film, followed by electrophoretic primer. The epoxy flooring paint film shows excellent wet adhesion. 要求环氧环氧地坪漆漆膜完整性好,否则腐蚀会从环氧地坪漆漆膜缺损处开始。地坪漆涂料黏度要尽量低,采用慢挥发和慢交联的涂料,以保证环氧地坪漆涂料在液态下停留足够长的时间,完全浸人工件表面的微孔中。如果可能的话,尽量采用烘烤底漆。

    It is required that the film integrity of epoxy floor paint is good, otherwise the corrosion will begin at the defect of the film. The viscosity of the floor paint should be as low as possible. The slow volatilization and slow cross-linking coatings are used to ensure that the epoxy floor paint stays in liquid for a long time and is completely immersed in the micro-pore of the surface of the workpiece. If possible, try to use baking primer.

    湿附着力要求环氧地坪漆涂层不仅强力地吸附在工件表面,且水透入漆膜时不被水解吸附。烘烤环氧地坪漆底漆通常防腐蚀较好,因为在较高温度下,树脂分子有更多机会在钢铁表面取向。氨基能够促进湿附着力,不易在钢铁表面被水排挤走。磷酸醋基也可以促进湿附着力,环氧树脂的磷酸醋能够提高地坪漆漆膜的附着力。

    Wet adhesion requires that the epoxy floor paint coating not only strongly adsorbs on the surface of the workpiece, but also is not adsorbed by hydrolysis when water penetrates the paint film. Baking epoxy floor varnish primers usually have better corrosion resistance, because at higher temperatures, resin molecules have more opportunities to orient on the surface of steel. Amino group can promote wet adhesion and is not easy to be squeezed out by water on the surface of steel. Phosphoric acid vinegar can also promote wet adhesion, and epoxy resin vinegar phosphate can improve the adhesion of floor paint film.

    树脂的抗皂化性要好。因为吸氧腐蚀在阴极产生氢氧根离子OH-,pH甚至会达到14,它催化诸如酷类基团的水解(皂化),降低漆膜的湿附着力。酞胺基团比醋类基团的耐水解(皂化)性好。环氧树脂的湿附着力和抗皂化性好,环氧树脂底漆比醇酸底漆表现出更大的抗皂化性,环氧一胺和环氧/酚醛底漆抗腐蚀性好,但环氧/酚醛底漆需要高温固化。

    The resin has good saponification resistance. OH-, which is produced by oxygen-absorbing corrosion at the cathode, can even reach a pH of 14. It catalyzes hydrolysis (saponification) of cool groups and reduces the wet adhesion of the paint film. The phthalamine group has better hydrolysis (saponification) resistance than the vinegar group. Epoxy resin has good wet adhesion and saponification resistance. Epoxy resin primer shows greater saponification resistance than alkyd primer. Epoxy monoamine and epoxy/phenolic primer have good corrosion resistance, but epoxy/phenolic primer needs high temperature curing.

    环氧地坪漆漆膜中应避免残留水溶性组分,否则易引起环氧地坪漆漆膜起泡。环氧地坪漆漆膜的残留溶剂若有亲水性溶剂,这种溶剂与地坪漆的干漆膜不相溶,作为分离相保留下来,导致环氧地坪漆漆膜起泡。底漆中不宜有氧化锌,氧化锌与水和二氧化碳反应,生成微溶于水的氢氧化锌和碳酸锌,导致地坪漆漆膜起泡。锌铬黄之类的钝化颜料,除非微溶于水,否则不能起作用,故其在地坪漆漆膜中的存在会导致起泡。

    Residual water-soluble components should be avoided in epoxy floor paint film, otherwise it is easy to cause foaming of epoxy floor paint film. If the residual solvent of epoxy floor paint film has hydrophilic solvent, the solvent is not compatible with the dry film of the floor paint, which is retained as the separation phase, resulting in foaming of the epoxy floor paint film. Zinc oxide should not be used in primer. Zinc oxide reacts with water and carbon dioxide to form zinc hydroxide and zinc carbonate which are slightly soluble in water, resulting in blistering of floor paint film. Passivation pigments such as zinc chrome yellow can not work unless they are slightly soluble in water, so their presence in floor paint film can lead to blistering.


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