The Research Of ACR Core Shell Emulsion Graft Copolymerization Of Vinyl Chloride Preparation Of High Impact PVC

High impact resistance PVC resins were developed to be prepared after comprehensive seed emulsion polymerization, vinyl chloride (VC) suspension polymerization and PVC processing technology in this paper.Research of emulsion polymerization:the polyacrylate resin(ACR) with core-shell structure was designed to prepare in different size, core-shell ratio, and monomer ratio. ACR emulsion nuclear layer monomer was mainly butyl acrylate (BA) with low glass transition temperature, acrylic acid ethyl ester (EA),2-ethyl acrylateester (2-EHA), and shell monomer was primarilymethyl methacrylate (MMA) with high glass transition temperature, cyclohexyl methyl acrylic acid (CHMA), styrene (ST), etc.Through investigation of the particle size of ACR, core-shell ratio and other factors, it is concluded that high impact resistance composite resin was synthetised under the condition of the ACR particle size 160?200 nm, core-shell ratio between 7/3?8/2, which is most conducive to VC suspension graft polymerizationt.Research of suspension polymerization:different categories of ACR emulsion in VC suspension system for graft polymerization respectively, through the adjustment of reaction temperature of suspension system, dispersing system, water oil ratio and mixing system, high impact resistance composite resin (ACR-g-VC) was prepared, whose regular performance was close to the requirement of national standard "GB/T 5761-2006". ACR-g-VC composite resin with optimal routine analysis indicators was obtained under the following conditions:t he ternary composite dispersed system with high alcoholysis PVA88, medium alcoholysis PVA80 and hydroxypropyl methyl cellulose (HPMC); dispersant/VC monomer was approximately 3.5-4.0 wt‰; water oil ratio between 1.8?2.0; stirring speed in 450-500 r/min.The processing and performance analysis of PVC:through the impact resistance analysis and characterization of the ACR-g-VC, it is demonstrated that notched impact strength was the highest when 8wt%-12wt% ACR was added into monomer.The characteristics and innovation of this subjects:1.The design of ACR emulsion formulation in advance, control for emulsion polymerization parameters and process, verify the accuracy of the formula design.2.Emulsion polymerization with reactive emulsifiers and traditional dispersant to reduce the effects of emulsifier on suspension polymerization system.3.Adjust the suspension polymerization system significantly, stabilize the polymerization system, and make further improvement on the mechanical properties of the ACR-g-PVC through the adjustment of particle size and size distribution.