Weather resistant, impact resistant and economical PVC promoter

Abstract

The invention relates to a PVC auxiliary agent with good weathering resistance, shock resistance and economical efficiency, which is characterized in that: the PVC auxiliary agent is a copolymer with a nuclear shell structure, wherein, a nuclear layer of the PVC auxiliary agent is formed by emulsion polymerization of butyl acrylate, chlorinated polyethylene and 2-ethyl hexyl acrylate under the protection of a surfactant and nitrogen and through initiation of an initiator, and a core shell is formed by continuous emulsion polymerization and grafting reaction of methyl methacrylate on the nuclear layer. By adoption of the total weight of a monomer polymer as 100 percent, the butyl acrylate occupies 30 to 40 percent; the chlorinated polyethylene occupies 30 to 40 percent; the 2-ethyl hexyl acrylate occupies 15 to 35 percent; and the methyl methacrylate occupies 5 to 20 percent. The PVC auxiliary agent has superior shock resistance and weathering resistance and simultaneously has superior powder fluidity, and the shock resistance of the PVC auxiliary agent is higher than that of MBS and acrylic ester shock modifiers which are widely applied in the industry.

Description

technical field [0001] The invention belongs to a processing aid for PVC products, in particular to a PVC additive with excellent weather resistance, impact resistance and economical efficiency. Background technique [0002] Polyvinyl chloride (pvc) is a general-purpose plastic with excellent cost performance. The impact strength of PVC products is not very satisfactory. Although the impact strength of products can be improved by adding CPE, MBS or high-impact ACR resin, CPE The price is low, the output is large, the application range is wide, and it does not contain carbon-carbon double bonds, but the impact resistance of CPE products is limited; MBS cannot improve the UV resistance of polybutadiene due to its main component polybutadiene. The weather resistance of the product; although the high impact ACR resin has impressive weather resistance because it does not have carbon-carbon double bonds, it is limited by the price limit of the raw material market, and there are in...

AI Technical Summary

Problems solved by technology

[0002] Polyvinyl chloride (pvc) is a general-purpose plastic with excellent cost performance. The impact strength of PVC products is not very satisfactory. Although the impact strength of products can be improved by adding CPE, MBS or high-impact ACR resin, CPE The price is low, the output is large, the application range is wide, and it does not contain carbon-carbon double bonds, but the impact resistance of CPE products is limited; MBS cannot improve the UV resistance of polybutadiene due to its main component polybutadiene. The weather resistance of the product; although the high impact ACR resin has impressive weather resistance because it does not have carbon-carbon double bonds, it is limited by the price limit of the raw material market, and there are inevitably disadvantages of high prices ; and the processing performance of polyvinyl chloride itself is very poor, the plasticizing temperature is very close to the decomposition temperature, and various processing aids must be added to improve its processing performance