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Multilayer rubber copolymer with excellent bleaching-resistant property and preparation method thereof

A technology of graft copolymer and aromatic compound, which is applied in the field of impact modifier and its preparation, can solve the problems of reducing whitening resistance, reducing impact strength, improving whitening resistance, etc., and achieves whitening resistance and impact strength Good results

Active Publication Date: 2011-04-20
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method to improve the whitening resistance is to add a large amount of crosslinking monomer to the latex or reduce the particle size, but the above method will reduce the impact strength; and to increase the particle size or reduce the content of the crosslinking monomer in order to improve the impact strength, it will cause micropores Resistant to bleaching
[0005] In addition, the existing patent (Korean Patent Application No. 2007-0021894) uses it as an impact modifier for PVC resin through the preparation method of latex, which can improve the color characteristics and low-temperature impact strength of PVC resin, but does not improve The method of bleaching resistance will be explained

Method used

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  • Multilayer rubber copolymer with excellent bleaching-resistant property and preparation method thereof

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preparation example Construction

[0016] The present invention is used for the preparation method of the SB type latex of MBS type graft copolymer, comprising:

[0017] (1) Conjugated diene monomers and ethylenically unsaturated aromatic compound monomer mixtures accounting for 25 to 75% by weight of the total monomer mixture used for preparation, and based on 100 parts by weight of the above-mentioned total monomer mixture , 0.2 to 5.0 parts by weight of the cross-linking monomer undergoes emulsion polymerization, thereby preparing the step of the first SB type latex;

[0018] (2) To the above-mentioned first SB type latex, emulsion polymerize 25 to 75% by weight of the remaining monomer mixture, and based on 100 parts by weight of the total monomer mixture, 0.01 to 5.0 parts by weight of the crosslinking monomer, thereby preparing the second Step 2 for SB type latex.

[0019] Preferably, in the reaction of the above-mentioned (1) step, the conjugated diene monomer and the ethylenically unsaturated aromatic ...

Embodiment 1

[0033] (Preparation of SB Latex)

[0034] The weight % of the following compounds is based on 100 weight % of the whole monomer mixture used to prepare the SB type latex, and the parts by weight are based on 100 weight parts of the above-mentioned whole monomer mixture.

[0035] In a 120-liter high-pressure polymerization vessel equipped with an agitator, first add 200 parts by weight of ion-exchanged water, 0.5 parts by weight of a buffer solution as an additive, 1.2 parts by weight of potassium oleate, 0.0047 parts by weight of ethylenediaminetetrasodium acetate, 0.003 parts by weight of ferrous sulfate, 0.02 parts by weight of sodium formaldehyde sulfoxylate and 0.1 parts by weight of dicumyl hydroperoxide.

[0036] As the first step, 30% by weight of butadiene, 20% by weight of styrene, and 1.0 part by weight of divinylbenzene were added to the above mixture, and polymerized at 35°C; When it is more than 90%, as the second step, add 45% butadiene, 5.0% by weight of styren...

Embodiment 2

[0046] Same as above-mentioned Example 1, the only difference is that when polymerizing the above-mentioned SB latex, 45% by weight of butadiene and 25% by weight of styrene are added as the first step; 30% by weight of butadiene is added as the second step.

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Abstract

The present invention provides a multilayer rubber copolymer having excellent bleaching-resistant property and the preparation method thereof. Specifically, the invention relates to preparation method of latex (which belongs to SB category) of ethylene unsaturated aromatic compound and conjugated diene monomer, wherein the latex is applicable to preparation of impact modifier applied to PVC having excellent bleaching-resistant property. The impact modifier is graft copolymer (which belongs to MBS category) of methyl crylic acid alkyl ester, conjugated diene monomer and ethylene unsaturated aromatic compound. When emulsion polymerization is conducted in butadiene monomer, aromatic vinyl monomer or the mixture of them, the content of crosslinked monomers is adjusted through two steps, so asto provide multilayer latex. The invention provides the preparation method of graft copolymer prepared by latex and the preparation method of PVC resin compound including the graft copolymer. When the graft copolymer of MBS category prepared by the latex of SB category prepared by the method in the present invention is used as impact modifier of PVC resin, the bleaching resistance and impact resistance can be improved.

Description

technical field [0001] The invention relates to an impact modifier for polyvinyl chloride (hereinafter referred to as "PVC") resin and a preparation method thereof, in particular to an alkyl (meth)acrylic acid used as an impact modifier for PVC resin A graft copolymer of ester-conjugated diene monomer-ethylenically unsaturated aromatic compound (hereinafter referred to as "MBS") and a preparation method thereof. Background technique [0002] It is known that the physical properties of MBS-based graft copolymers are affected by the content of each grafted monomer, the polymerization method, the content and particle size of latex used as a matrix, and the like. In order to improve the impact strength, the content and particle size of the latex used as the matrix are usually increased, but when the above-mentioned latex is used in PVC resin, as the particle size of the graft copolymer particles used for the impact modifier increases, its light scattering The resistance is also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/10C08F236/06C08F236/08C08F236/18C08F212/36C08F279/06C08L27/06C08L51/06
Inventor 金伦皞金建秀金正训金炯陈
Owner LG CHEM LTD