Preparation method of BMC mould pressing resin

Abstract

The invention relates to a preparation method of BMC mould pressing resin. The preparation method comprises the following steps: feeding materials according to a feeding sequence; after the feeding isfinished, adding corresponding auxiliary agents and small materials, slowly opening a heating oil valve, and starting to raise the temperature; heating a first material to effluent, slowly heating from the temperature of the effluent, introducing nitrogen in the heating process, sampling, measuring the acid value, and cooling; after the material is cooled, adding a second material and an auxiliary agent; after the second material is fed, heating to discharge water, keeping the temperature for reaction after discharging water, heating and keeping the temperature, introducing nitrogen in the heating process, keeping the temperature, and measuring the acid value; after the acid value reaches the standard and the polyester 150 DEG C lamina viscosity reaches the standard, starting vacuum pumping, cooling after the product is detected to be qualified, adding JQ and PQ hydroquinone, continuing to cool the material, and diluting; adding DQ and T50 small materials in advance before dilution; and cooling after dilution, adding copper naphthenate, carrying out vacuum dehydration, continuing cooling, sampling, detecting, filtering after the product is detected to be qualified, and packaging.Compared with the prior art, the quality stability of the BMC mould pressing resin is improved, and the strength and hardness of the BMC mould pressing resin are improved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of BMC molding resin. Background technique [0002] Unsaturated polyester resin (Unsaturated Polyester Resins, referred to as UPR) is a linear polymer compound with multifunctional groups. It has polyester chain bonds and unsaturated double bonds on its backbone main chain, and each end of the macromolecular chain has Carboxyl and hydroxyl groups, the biggest advantage of using unsaturated polyester resin is that its diluent will undergo copolymerization and crosslinking reaction with the double bond on the main chain when it is finally used, so the solvent volatilization is less during use, so it belongs to the environment. Protecting a class of products, the product is often used as a matrix in the field of SMC / BMC products. BMC block molding compound, also known as unsaturated polyester glass fiber reinforced molding compound, its main raw materi...

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Problems solved by technology

[0002] Unsaturated polyester resin (Unsaturated Polyester Resins, referred to as UPR) is a linear polymer compound with multifunctional groups. It has polyester chain bonds and unsaturated double bonds on its backbone main chain, and each end of the macromolecular chain has Carboxyl and hydroxyl groups, the biggest advantage of using unsaturated polyester resin is that its diluent will undergo copolymerization and crosslinking reaction with the double bond on the main chain when it is finally used, so the solvent volatilization is less during use, so it belongs to the environment. Protecting a class of products, the product is often used as a matrix in the field of SMC / BMC products. BMC block molding compound, also known as unsaturated polyester glass fiber reinforced molding compound, its main raw materials are chopped glass fiber, unsaturated Polyester resin, fillers and various additives are fully mixed into lump prepreg, which belongs to one of thermosetting molding materials. It is mainly used in electrical appliances, motors, automobiles, construction, daily necessities and other fields. Although the molding material has been continuously developed and improved for decades, the batch quality of the product is still unstable, and the tensile strength, bending strength and bus hardness are not high, so it is necessary to make improvements

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