Plasticizer and preparation method thereof, composition for polyether waterproof coating, polyether waterproof coating and preparation method thereof

By preparing a modified polyether plasticizer in a silane-modified polyether waterproof coating, the problem of poor compatibility between the plasticizer and the system was solved, and the stability and weather resistance of the coating film under immersion conditions were improved.

CN121991335APending Publication Date: 2026-05-08KESHUN WATERPROOF TECH CO LTD
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Patent Information

Application Number
CN202511939129.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-22
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

In existing silane-modified polyether waterproof coatings, the plasticizer has poor compatibility with the system, which leads to easy precipitation and migration of the coating film under water immersion conditions, affecting the coating film performance.

Method used

A modified polyether plasticizer was prepared by grafting α,ω-dihydroxypolydimethylsiloxane with epoxide alkane under a protective atmosphere. This modified plasticizer was then used in conjunction with acryloyloxysilane to improve compatibility and plasticizing effect.

Benefits of technology

It improves the compatibility and weather resistance of coatings, solves the problem of plasticizer precipitation and migration under water immersion conditions, and enhances the tensile properties and weather resistance of coating films.

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Abstract

The invention relates to the field of building waterproofing, and discloses a plasticizer and a preparation method thereof, a composition for a polyether waterproof coating, the polyether waterproof coating and a preparation method of the polyether waterproof coating. The method for preparing the modified polyether plasticizer comprises the following steps: (1) in a protective atmosphere, in the presence of a base catalyst, stirring and mixing alpha, omega-dihydroxy polydimethylsiloxane and alkylene oxide to obtain an intermediate I; and (2) contacting and mixing a neutralizer with the intermediate I to obtain the modified polyether plasticizer, relative to 100 parts by weight of the alpha, omega-dihydroxy polydimethylsiloxane, the use amount of the base catalyst is 0.1 to 1 part by weight, the use amount of the alkylene oxide is 400 to 900 parts by weight, and the use amount of the neutralizer is 0.12 to 1.2 parts by weight. The silane modified polyether waterproof coating prepared from the modified polyether plasticizer provided by the invention has obviously better weather resistance.
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