Impact modifier applied to PVC bellow

Abstract

The invention provides an impact modifier for PVC bellows. The impact modifier is characterized in that the impact modifier is a core-shell structure copolymer; a core shell of the impact modifier is formed through the emulsion polymerization of butyl acrylate and neopentylglycol diacrylate, which is initiated by an initiator in the presence of surfactant and nitrogen; methyl methacrylate and ethyl acrylate are used for proceeding with emulsion polymerization grafting reaction on the core layer, so as to form a shell layer of the impact modifier, wherein the total weight of polymeric monomer is counted as 100 percent, the butyl acrylate accounts for 40 to 50 percent; the neopentylglycol diacrylate accounts for 1 to 5 percent; the ethyl acrylate accounts for 40 to 45 percent; and the methyl methacrylate accounts for 4 to 15 percent. The impact modifier grafts the neopentylglycol diacrylate in the core layer, so as to ensure that the obtained PVC bellows can have better weather resistance and impact resistance, excellent adjustable processability and powder fluidity, and reduces production cost at the same time, thereby having excellent economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of polymer material emulsion polymerization graft copolymerization. In particular, it relates to an impact modifier applied to PVC corrugated pipes. Background technique [0002] Polyvinyl chloride (PVC) is a general-purpose plastic with excellent cost performance. Among them, the PVC resin used in the corrugated pipe production industry has the advantages of convenient processing, many specifications, corrosion resistance, good flexibility and flexible connection, and can transport solid powder. Many materials such as liquids are widely used in various fine and traditional chemical industries, but the impact strength of polyvinyl chloride bellows is not very satisfactory, especially the flexibility of many different equipment used to connect different equipment with mechanical moving parts Connection, after the mechanical and repeated movement between the moving parts, the bellows are prone to breakage, fo...

AI Technical Summary

Problems solved by technology

[0002] Polyvinyl chloride (PVC) is a general-purpose plastic with excellent cost performance. Among them, the PVC resin used in the corrugated pipe production industry has the advantages of convenient processing, many specifications, corrosion resistance, good flexibility and flexible connection, and can transport solid powder. Many materials such as liquids are widely used in various fine and traditional chemical industries, but the impact strength of polyvinyl chloride bellows is not very satisfactory, especially the flexibility of many different equipment used to connect different equipment with mechanical moving parts Connection, after the mechanical and repeated movement between the moving parts, the bellows are prone to breakage, forcing the equipment to stop to replace the bellows conveying parts, which affects the continuous and smooth process. For this reason, people invented CPE, MBS or high impact ACR Resin is used to improve the impact strength of products in order to reduce the frequent interruption of the process flow. Among them, CPE is cheap, has a large output, and has a wide range of applications, and it does not contain carbon-carbon double bonds, but the impact resistance of CPE products is limited; MBS is due to its own The main component polybutadiene has poor UV resistance, so MBS cannot improve the weather resistance of the product; although the high-impact ACR resin has impressive weather resistance due to the lack of carbon-carbon double bonds, it can be used at low temperatures. Under certain conditions, the improvement of impact strength is extremely limited, and is limited by the price limit of the raw material market, and there are inevitably disadvantages of high prices.