Carboxylated polyvinyl acetate The copolymer of vinyl acetate and crotonic acid brings a dual breakthrough in low shrinkage performance and process adaptability to SMC technology.

The brand-new carboxylated polyvinyl acetate product – vinyl acetate and crotonic acid copolymer brings dual breakthroughs to the SMC process, namely low shrinkage performance and process adaptability.

• Precise adaptation to SMC process: The carboxylated modified structure retains the compatibility of polyvinyl acetate with the SMC system, while enhancing the bonding strength with inorganic fillers through carboxyl groups. It balances hydrophilic properties with moisture resistance in molding processes, solving the problems of easy delamination and poor fluidity of common low shrinkage agents.
• Benchmarking against imported quality: Equivalent in performance to Wacker VINNAPAS C501, it matches key indicators such as shrinkage control, surface finish, and mechanical property retention in SMC products, making it a direct replacement that reduces procurement costs for enterprises.
• Strong process compatibility: Good flowability optimizes the spreadability of SMC paste, reduces bubble residuals during molding, and enhances the molding efficiency and pass rate of products. It is suitable for various high-end SMC products such as automotive parts and electrical insulation parts.

In the field of SMC (Sheet Molding Compound) molding, low-shrinkage agents are one of the core additives that determine the precision and surface quality of products. Traditional polyvinyl acetate-based low-shrinkage agents often face issues such as the contradiction between hydrophilicity and process moisture resistance, as well as insufficient flow and spreading properties, which restrict the molding efficiency of high-end SMC products.

Addressing industry pain points, Nitchen Group has launched a new carboxylated polyvinyl acetate product – vinyl acetate and crotonic acid copolymer. With precise molecular structure design, it brings dual breakthroughs in low shrinkage performance and process adaptability to the SMC process.

By introducing carboxyl functional groups into the polyvinyl acetate (PVAc) backbone, this product not only retains the excellent compatibility of PVAc with SMC resin systems but also enhances the interfacial bonding with inorganic fillers such as aluminum trihydrate (ATH) and calcium carbonate. Its hydrophilic properties optimize the wettability of the paste, while the hydrogen bonding between the carboxyl groups and the matrix resin effectively suppresses uneven shrinkage during molding, ensuring that the linear shrinkage rate of the product is stably controlled within 0.1%. This fully meets the precision requirements for high-end products such as automotive exterior parts and electrical insulation components.

Compared to the imported similar product Wacker VINNAPAS C501, our carboxylated polyvinyl acetate achieves comprehensive matching in key performance: under the molding conditions of 150°C/10MPa, the surface finish of the product can reach Ra0.8μm, the retention rate of mechanical properties exceeds 95%, and the flow distance is increased by 15% compared to ordinary PVAc, making it more suitable for the filling requirements of complex cavity molds. Enterprises can directly replace imported products without adjusting existing formulas and process parameters, and the procurement cost can be reduced by 20%-30%.

Good process compatibility is also one of the core advantages of the product. Whether it is high-filler filling system or thin-walled product molding, this product can effectively reduce bubble residue and corner shortages, raising the product qualification rate to over 98%. At the same time, the product exhibits excellent thermal stability, showing no decomposition under high-temperature molding conditions of 180°C, providing reliable support for continuous production.

As a local enterprise specializing in the research and development of composite material additives, we not only offer products with performance comparable to imported ones, but also tailor modification solutions according to customers’ specific process requirements. From formula optimization to on-site technical support, we provide a comprehensive solution for SMC product enterprises.