Anti-cracking PU white undercoat and preparation process thereof

Abstract

The invention discloses an anti-cracking PU white undercoat and a preparation process thereof. The preparation process comprises the steps of sequentially adding modified synthetic resin fat, organic bentonite slurry, a modified adhesive force aid and a defoaming agent into a dispersing cylinder, regulating the rotation speed to be 1000r / min, dispersing for 5-8 minutes until the mixture is uniformly dispersed, adding rutile titanium dioxide, regulating the rotation speed to be 1500r / min, dispersing for 15-20 minutes, then maintaining the rotation speed constant, sequentially adding zinc stearate, special coat preparing powder and talcum powder, dispersing for 10 minutes, regulating the rotation speed to be 1000r / min, sequentially adding a flatting agent, butanol acetate and a delaying agent, and dispersing for 5 minutes, so as to obtain the anti-cracking PU white undercoat. The anti-cracking PU white undercoat has excellent anti-cracking performance, is capable of adapting hostile, cold, hot, dry and wet environments, does not contain substances including benzene, methylbenzene and xylene and is environmentally friendly.

Description

technical field [0001] The invention relates to the field of preparation of an anti-cracking white primer, in particular to a PU anti-cracking white primer and a manufacturing process thereof. Background technique [0002] Polyurethane (PU) coatings are currently a more common type of coating, which can be divided into two-component polyurethane coatings and one-component polyurethane coatings. Two-component polyurethane topcoat paint is generally composed of isocyanate prepolymers (also known as low molecular carbamate ester polymers) and hydroxyl resins, commonly known as curing agent components and main agent components. There are many varieties of this type of coating, and the application range is also very wide. According to the difference of the hydroxyl group-containing components, it can be divided into acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane and other varieties. Generally, they have good mechanica...

AI Technical Summary

Problems solved by technology

[0003] At present, the PU white primer applied to wood coatings, due to the large seasonal climate difference between the south and the north, and in the process of changing the seasons, it is subjected to high temperature and high humidity in the south in summer and low temperature and low humidity in winter in the north. Under the test of harsh environmental conditions, cracks often appear in the PU white primer after construction, which affects the appearance of the furniture and shortens the service life of the PU white primer

[0004] In the Chinese patent with the application number "201310740823.3", an invention patent titled "a PU white primer and its flow coating method" is disclosed. The ingredients in the PU white primer mainly include castor oil modified short oil Alkyd resin, titanium dioxide, transparent powder and fumed silica and other components make the PU white primer in the invention effectively avoid the occurrence of broken screens and flashing screens during the construction process, and meet the requirements of curtain coating. To a certain extent It has the performance of anti-cracking. However, after the construction is hard and it is subjected to the test of harsh environment, cracking may occur

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