A self-closing polymer cement waterproof coating

Abstract

The invention discloses a self-closing polymer cement waterproof coating. The self-closing polymer cement waterproof coating is formed by mixing powder and liquid at a weight ratio of 1:1; Calculated by parts, it consists of 45 parts of cement, 45 parts of quartz powder, 40 parts of filler and 10 parts of active masterbatch FLW. The liquid material, calculated by parts by weight, consists of 90 parts of acrylate emulsion, 0.5 parts of wetting agent SILCO WET 065, 5 parts of trimethylpentanediol diisobutyrate, 0.5 parts of silicone defoamer, 0.5-0.8 parts of water retaining agent and 20 parts of water; wherein the water retaining agent is alkyl biphenyl ether sulfonate salt, fatty alcohol polyoxyethylene ether sulfate or alkylphenol ether sulfosuccinate. The self-closing performance of the self-closing polymer cement waterproof coating film is 4 hours, the initial setting time is greater than 45 minutes, and the film has good bonding performance after coating, and the bonding 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.