Vinyl resin belongs to the category of unsaturated polyester resin. It is made of epoxy which refers to the ring-opening addition chemical reaction with methyl acrylate. That is, it retains the basic segment of epoxy resin and has good manufacturability of unsaturated polyester resin.
As an internationally recognized corrosion-resistant resin, vinyl resin is not only widely used in the field of chemical corrosion protection, but also has other applications, including automotive manufacturing. The thickening properties of vinyl resins have been the research direction of major manufacturers. This is because the application characteristics on BMC/SMC have been recognized by customers. With the application of BMC/SMC in auto parts, thickened vinyl resin can withstand higher impact force than general unsaturated resin, and has good creep resistance and fatigue resistance. Thickened vinyl ester resin is a resin that allows the curing process to be carried out in stages. It is used in prepregs or sheet molding compounds to allow the curing reaction to proceed to the first stage before hot press molding. The resin used must have chemical thickening properties, and can retain the unsaturation in the molecule, so that it can be crosslinked and cured during molding. To this end, acidic functional groups were introduced on the vinyl ester molecules for the thickening reaction. This kind of resin has better permeability to glass fiber than polyester resin, and has better fluidity, so that the pressure can be reduced during hot pressing, and the reaction speed is very fast in the second stage. This epoxy vinyl ester resin sheet molding compound can be used to mold structural parts, especially structural parts on automobiles to reduce weight. It is used in automobile parts such as wheels, seats, heat dissipation frames and engine valve sleeves.
When Ford Motor Co., Ltd. manufactures separate car seats, the main material is made of vinyl resin and pressed with 65% non-directional glass fiber. Its cost is only 75% of the steel seat, and the weight is the steel seat. 63%. In addition, due to its sufficient mechanical strength and stiffness, heat cycle resistance, and corrosion resistance, vinyl ester resins can better meet the requirements of high-quality FRP products. The integrated component of the front beam/transverse spring of the car is small but the structure is complex and can withstand high loads. Due to the high requirements for structural strength, stiffness, durability and suspension performance, glass fiber reinforced materials and vinyl are used Ester resin. The engine valve sleeves used in GM's main models and all engine valve sleeves of Chrysler Motors are manufactured using SMC and BMC, and the base resin mainly uses vinyl ester resins.
In recent years, with the increasing application of carbon fiber composite materials in automobiles, the European thermosetting resin composite resin company has introduced vinyl ester carbon fiber SMC (CF-SMC) for semi-structured and structural automotive parts that are not Class A surfaces. . The raw materials and molding equipment for the new vinyl ester carbon fiber products are provided by Ludwigshafen of Germany. The CF-SMC produced can provide excellent moldability, very light weight and high mechanical properties. The components are AtlacXP810 vinyl ester resin and dispersed large tow (48K) carbon fiber reinforcement.
At present, in my country, resin stamping dies have been successfully applied in the trial production of domestic cars. FAW Mould Manufacturing Center has designed and manufactured 12 sets of resin moulds, which are the stretching moulds for large and complicated inner and outer covering parts such as luggage, hood, front and rear left and right fenders. Its main feature is that the mold surface is based on the main model of CAD/CAM processing, which is cast and molded with high-strength resin and low shrinkage epoxy vinyl ester resin. The gap between the convex and concave molds is accurately controlled by imported special wax pieces, and the mold size accuracy is high. The manufacturing cycle can be shortened by 1/2-2/3, and the manufacturing cost of 12 sets of molds can be saved by about 10 million yuan. Resin punching mold technology has opened a way for the trial production and small batch production of cars in my country, which is a domestic initiative.
Domestic vinyl ester resins started production in the late 1970s, but due to higher product prices and insufficient popularity, the output is still small, and the promotion and application are still not ideal. The expanded application of vinyl resins in China stems from the result of a group of leading companies developing and applying overseas vinyl resin greases entering the Chinese market in the late 1990s. In recent years, the development of high-performance composite materials has driven the growth of vinyl resins. In the smelting chemical industry, precision high-energy electrical and electronic industry, sea, land and air transportation industry, energy conservation and emission reduction of traditional energy and renewable energy development, with unique properties, it has become an important matrix material in high-performance composite materials.
With the development of the automobile manufacturing industry, the use of high-performance materials has greatly improved the structure and performance of composite materials, improved the molding speed and manufacturing quality, and accelerated the practical process of composite materials in automobiles. The vinyl resin will also be increasingly used in automobile manufacturing