Self-closing type polymer cement waterproof coating

Abstract

The invention discloses a self-closing type polymer cement waterproof coating. The self-closing type polymer cement waterproof coating is prepared by mixing a powder material and a liquid material at a weight ratio of 1:1, wherein the powder material comprises the following components in parts by weight: 45 parts of cement, 45 parts of quartz powder, 40 parts of filler and 10 parts of active master batch FLW and the liquid material comprises the following components in parts by weight: 90 parts of acrylic emulsion, 0.5 part of wetting agent SILCOWET065, 5 parts of trimethyl pentanediol diisobutyrate, 0.5 part of silicone antifoaming agent, 0.5-0.8 part of water-retaining agent and 20 parts of water, wherein the water-retaining agent is alkyl biphenyl ether sulfonate, fatty alcohol polyoxyethylene ether sulfate or alkyl phenol ether sulfosuccinate ester salt. The self-closing time of the self-closing type polymer cement waterproof coating film is 4 hours, the initial setting time is more than 45 minutes, after coating is applied, the self-closing type polymer cement waterproof coating has good adhesive properties and the adhesive strength is 0.7MPa.

Description

technical field [0001] The invention relates to a self-closing polymer cement waterproof coating. Background technique [0002] Self-closing (self-healing) polymer cement waterproof coating is a functional polymer cement waterproof coating with self-sealing (self-healing) performance after the coating film is cracked by external force. Its representative product is PARATEX invented by Ozeki Chemical Co., Ltd. of Japan. At present, some domestic enterprises have successfully developed related products (see ZL201010137870.5, ZL201110225371.6) and started to promote their use. Its healing mechanism is generally through plugging and healing through the formation of water permeable crystals. The self-closing property is expressed by the self-sealing (self-healing) time of the cracks in the coating film under specified conditions. In order to adapt to the higher self-healing requirements of waterproofing projects and achieve better practical effects (that is, shorten the self-h...

AI Technical Summary

Problems solved by technology

However, in practical engineering applications, the construction effect of self-closing polymer cement waterproof coatings is often unsatisfactory, mainly because the addition of active substances will cause the two components of the coating to quickly solidify after mixing, shorten the construction time, and the coating is difficult to self-flow. Ping, such as the self-closing (self-repairing) polymer cement waterproof coating product of the applicant (see ZL201110225371.6). When the active masterbatch accounts for 4% of the powder by weight, the self-closing property is 7 hours, and the initial setting time 40 minutes, the setting time of the coating basically matches the construction time; when the active masterbatch accounts for about 7% by weight of the powder, the self-closing property is 4 hours, and the initial setting time is 15 minutes, that is, the self-repairing effect is greatly improved. However, the setting time of the paint does not match the construction time, so the coating cannot be self-leveling

If the setting time is increased by increasing the amount of water, the mechanical properties of the coating film will be greatly affected; Due to its large molar mass, it needs to be added in a large amount, which leads to a series of performance degradation of the coating film and the effect is not good.