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Transparent acrylic ester impact-resisting modifier for PVC

A technology of acrylates and impact modifiers, which is applied in the field of transparent acrylates impact modifiers, and can solve the problems of not being able to use polyvinyl chloride, not being able to be used outdoors, and poor weather resistance.

Active Publication Date: 2008-06-04
SHANDONG RUIFENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2. MBS (methyl methacrylate-butadiene-styrene copolymer) is a graft copolymer of methyl methacrylate grafted with styrene-butadiene latex or butyl latex. This type of impact modifier is used for polystyrene Vinyl chloride (PVC) has good impact resistance, transparency, surface finish, etc.: its disadvantage is poor weather resistance, and its products are widely used in polyvinyl chloride (PVC) transparent products, but due to the unsaturated The butadiene component is easy to decompose by light, and its products cannot be used outdoors
[0005] 3. Impact-resistant ACR (acrylic ester copolymer) is a graft copolymer of methyl methacrylate grafted with acrylate elastomer. This type of impact modifier has better performance in polyvinyl chloride (PVC). Impact resistance, cold resistance, weather resistance, chemical resistance, surface finish, etc.: its disadvantage is that it cannot be used for poly Vinyl chloride (PVC) transparent products

Method used

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  • Transparent acrylic ester impact-resisting modifier for PVC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 50-70% soft water (the total amount of the emulsion is calculated as 100%), 1% (accounting for the total amount of polymerized monomers) sodium lauryl sulfate into a 3000L glass-lined kettle, start stirring, add butyl acrylate, benzene Ethylene and crosslinking agent ethylene glycol dimethacrylate, based on the amount of butyl acrylate and styrene as 100%, butyl acrylate is 50%, styrene is 50%, ethylene glycol dimethacrylate is 1% of the total amount of polymerized monomers in the core layer and 0.01% of the total amount of polymerized monomers in the core layer and the shell layer are added. ℃. After the exotherm is complete, keep the temperature at 80-85°C for 1 hour. Continue to add polymerized monomers methyl methacrylate and styrene to undergo emulsion polymerization grafting at 70-80 ° C to obtain a shell layer. Based on the total amount of polymerized monomers in the shell layer as 100%, methyl methacrylate is 50%. Styrene is 50%. The core layer polymerize...

Embodiment 2

[0023] The technical process is the same as in Example 1, except that the amount of sodium lauryl sulfate is 2% of the total polymerized monomers, the initiator adopts ammonium persulfate, and the consumption is 0.05% of the total polymerized monomers, and the crosslinking agent adopts Allyl methacrylate is used in an amount of 2% of the total amount of polymerized monomers in the core layer. The butyl acrylate in the core layer is 60%, the styrene is 40%, the methyl methacrylate in the shell layer is 40%, and the styrene is 60%. The monomer accounted for 10% of the total polymerized monomer. The pH of the emulsion was adjusted at 5 by acrylic acid.

Embodiment 3

[0025] The technical process is the same as in Example 1, except that the amount of sodium lauryl sulfate is 3% of the total polymerized monomer, the initiator adopts ammonium persulfate, and the consumption is 0.02% of the total polymerized monomer, and the crosslinking agent adopts The dosage of diallyl phthalate is 0.5% of the total amount of polymerized monomers in the core layer. The core layer is 70% butyl acrylate and 30% styrene. The methyl methacrylate in the shell layer is 50%, the styrene is 50%, the polymerized monomers in the core layer account for 80% of the total polymerized monomers, and the polymerized monomers in the shell layer account for 20% of the total polymerized monomers. Adjust the pH of the emulsion to 2.

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Abstract

The inventions relates to transparent type acrylic impact modifier used in PVC, which is core-shell structural copolymer. Crosslinking agent is added into the polymeric monomer butyl acrylate and the styrene to carry out emulsion polymerization, thus obtaining the core layer; the shell layer is obtained through continuous emulsion polymerization grafting reaction of polymeric monomer styrene and methyl methacrylate on the core layer. The core layer polymeric monomer accounts for 80-90 percent of total polymeric monomer, the polymeric monomer of the shell layer accounts for 10-20 percent of the total polymeric monomer and pH of emulsion is controlled between 2 and 7. The emulsifier and the pH of the emulsion are used for adjusting granulation size of the copolymer between 80-150nm so as to guarantee the uniform with the refractive index of the PVC, thereby the product has stress whitening resistance and transparency when is used in PVC. Besides having the property of MBS resin, the product also solves the weather resistant problem of the MBS resin and can be used in polyvinyl chloride PVC transparent exterior products.

Description

technical field [0001] The invention belongs to an impact modifier for polyvinyl chloride (PVC), in particular to a transparent acrylate impact modifier. Background technique [0002] The main varieties of impact modifiers for polyvinyl chloride (PVC) are CPE (chlorinated polyethylene), MBS (methyl methacrylate-butadiene-styrene copolymer), impact-resistant ACR (acrylic ester copolymer) things) etc. Its characteristics are: [0003] 1. CPE (chlorinated polyethylene) is a chlorinated product of high-density polyethylene. This type of impact modifier is used in polyvinyl chloride (PVC) to have good impact resistance, cold resistance, and chemical resistance. Sex, etc.: Its disadvantages are poor transparency and low tensile strength. It cannot be used in polyvinyl chloride (PVC) transparent products. [0004] 2. MBS (methyl methacrylate-butadiene-styrene copolymer) is a graft copolymer of methyl methacrylate grafted with styrene-butadiene latex or butyl latex. This type of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08F265/06C08F2/22
Inventor 赵圣宝孙锋赵立峰周学伟
Owner SHANDONG RUIFENG CHEM
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