A kind of high-strength crack-resistant external wall elastic putty powder and its preparation method

Abstract

The invention relates to the technical field of building materials, and specifically discloses a high-strength crack-resistant outer wall elastic putty powder, which is prepared by mixing the following raw materials in parts by weight: 600-700 parts of quartz sand, 300-400 parts of gray cement, and putty powder Add 30 to 50 parts of masterbatch; the putty powder masterbatch is composed of the following raw materials in parts by weight: 1.5 to 2.5 parts of palm fiber, 25 to 40 parts of redispersible latex powder, 3 to 3 parts of hydroxypropyl methylcellulose 5 parts, 0.3-0.6 parts of starch ether, 1.5-2.5 parts of polypropylene short fiber, 0.8-1.2 parts of hydrophobic agent, and 0.3-0.6 parts of water reducing agent. At the same time, the invention also discloses a preparation method of the high-strength crack-resistant elastic putty powder for exterior walls. When the putty powder is used to paint exterior walls, it can obviously improve the crack resistance of the wall coating. The bonding force of the base layer is stronger and it is not easy to fall off.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a high-strength crack-resistant outer wall elastic putty powder and a preparation method thereof. Background technique [0002] Putty powder is a kind of building decoration material. It is a kind of base material used for wall repair and leveling, which lays a good foundation for the next decoration. Putty on wall can be divided into two kinds according to its application: putty on inner wall and putty on outer wall. Putty on outer wall can resist wind, blowing and sun, so it has good gelation, high strength and low environmental index. The comprehensive index of putty in the inner wall is good, and it is hygienic and environmentally friendly. Therefore, the putty in the inner wall is not for external use, and the putty for outer wall is not for internal use. [0003] Conventional putty is composed of gypsum or cement base, so rough surfaces are easier to bond firmly...

AI Technical Summary

Problems solved by technology

Crack resistance is an evaluation index of wall putty coating, which requires the material itself to have certain elasticity or plasticity. When micro-cracks occur in the base layer of the wall surface, the putty coating will undergo elastic or plastic deformation under the action of external force. No cracks appear on the surface. The main components of the existing putty powder are heavy calcium (or talcum powder), gray calcium, etc., but due to the problems in its formula itself, the crack resistance of the putty coating is not good when it is applied. It is very ideal. In order to enhance the crack resistance of putty in the prior art, it is generally used to increase the amount of adhesives such as cement or rubber powder, but the effect has not been substantially improved.

At the same time, most of the putty powders on the existing market contain harmful ingredients such as benzene, toluene, acetone, alcohols, etc., even if their content in a few high-grade putty powder products is only slightly lower than the national standard (or added deodorant), However, they are not conducive to health and are not environmentally friendly; putty powder generally needs to pass through an intermediate medium (such as an interface agent) to combine well with the inorganic building wall matrix, and the formed putty coating also has easy aging and falling off, poor weather resistance, Not fireproof and water resistant and low cost performance

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