Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE An epoxy-silane oligomer (PGOPTS) was synthesized to modify styrene–acrylate latex for application in polymer cement waterproof coatings. The organic–inorganic co-crosslinking network, formed via epoxy ring-opening and silanol condensation, significantly enhances mechanical stability: the modified coatings show significantly fewer changes in tensile properties under harsh water, alkali, and thermal aging conditions.

ABSTRACT
Crosslinking modification of polymer emulsions is an effective approach to suppress swelling and improve coating durability. In this study, an epoxy-functional silane oligomer crosslinker (PGOPTS) was synthesized via a silane hydrolysis–condensation route using γ-(2,3-epoxypropoxy)propyltrimethoxysilane (GOPTS) as the monomer. A styrene–acrylate latex (SAL) crosslinked by PGOPTS was used, and the process variables were optimized using response surface methodology. Under the optimal conditions of 80.8°C reaction temperature, 0.58 wt% PGOPTS content, and 6.84 mol% tetrabutylammonium bromide (TBAB), the modified latex film exhibited a 35.70% reduction in water absorption and a 13.4° increase in water contact angle, indicating improved water resistance. The modified latex was further applied to polymer cement waterproof coatings. Silanol self-condensation and reactions with cement hydration products promoted the formation of an organic–inorganic co-crosslinked network. The resulting coating exhibited a 30.61% reduction in water absorption, a 14.2° increase in contact angle, and enhanced durability. This work demonstrates a practical crosslinking strategy for durable polymer cement waterproof coatings.