As a kind of high-performance unsaturated resin, vinyl resin thickening properties of manufacturers has always been the research direction, this is because the unique application characteristics of BMC/SMC recognised by the majority of customers, especially with the BMC/SMC application in automobile parts, thickening type vinyl resin is the impact of the general higher unsaturated resin, It also has good creep resistance and fatigue resistance.These components include wheels, seats, heat dissipation frame, gate plate, engine valve sleeve, etc.Of course, thickened vinyl resins are widely used in electrical insulation, industrial pumps and valves, golf balls and so on.

    As a thickening vinyl resin, the resin is naturally required to have the following characteristics:

    Good wettability with reinforced materials and fillers;

    (2) initial low viscosity and rapid thickening characteristics;

    (3) Good mechanical properties, including toughness and fatigue resistance;

    (4) longer storage cycle;

    (5) lower curing exothermic peak and lower styrene volatilization.

    To use effect, in the synthesis of vinyl resin, the more common method is: the original introduction of acidic functional groups on vinyl ester molecule (carboxylic acids) and reusing the carboxyl and alkaline earth metal oxides, such as magnesium oxide, calcium oxide, etc.), but this method long thickening time, generally need a few days, the condition is sensitive to moisture content.Thus also developed another method, which USES isocyanate and polyol reaction to produce mesh structure, so as to achieve rapid thickening of the resin, this method is suitable for low pressure molding, stable viscosity control, low requirements for temperature and humidity, stored for a long period, at the same time products combined with the characteristics of high strength between the layers, at the same time also can use low acid value resin with excessive alcohol as thickening agent.