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Acrylic copolymer coagulant and method for preparing graft copolymer using same

A technology of acrylic copolymer and coagulant, applied in the field of acrylic copolymer coagulant, can solve the problems of deterioration of impact strength and surface gloss characteristics of ABS graft copolymer, decrease in productivity, etc., to improve latex stability, processability and appearance Excellent effect

Active Publication Date: 2021-10-12
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when acetic acid was used as a coagulant in the expansion, excessive aggregates were generated, and when the concentration of the butadiene rubber polymer latex was decreased to reduce the generation of aggregates, the productivity decreased
In order to solve these problems, there has been proposed a method of using an acrylic copolymer coagulant which is a copolymer of a carboxylic acid-based monomer and an acrylic monomer, but this method also suffers from deterioration of the impact strength and surface gloss characteristics of the ABS graft copolymer The problem

Method used

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  • Acrylic copolymer coagulant and method for preparing graft copolymer using same
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  • Acrylic copolymer coagulant and method for preparing graft copolymer using same

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preparation example Construction

[0067] 2. Preparation of Acrylic Copolymer Coagulant

[0068] The acrylic copolymer coagulant according to one embodiment of the present invention can be produced by a method comprising: providing a polymerization solution containing a monomer mixture containing a carboxylic acid monomer and an acrylic monomer represented by Chemical Formula 1, and a first emulsifier; and adding the first emulsifier into a reactor, and then performing polymerization while continuously feeding the polymerization solution.

[0069] The content of the carboxylic acid monomer unit in the monomer mixture may be the same as the content of the carboxylic acid monomer unit in the acrylic copolymer coagulant.

[0070] Meanwhile, the total amount of the first emulsifier and the second emulsifier may be 0.2 to 0.6 parts by weight or 0.3 to 0.5 parts by weight relative to 100 parts by weight of the monomer mixture. When the above range is satisfied, the average particle diameter of the acrylic copolymer ...

experiment example 1

[0105] The properties of the acrylic copolymer coagulants of Examples and Comparative Examples were evaluated by the methods described below, and the results are shown in the table.

[0106] (1) Average particle diameter (nm): Measured by a dynamic light scattering method using a Nicomp 380HPL instrument (manufactured by Nicomp).

[0107] (2) Weight-average molecular weight (g / mol): acrylic acid copolymer coagulant latex was dissolved in tetrahydrofuran (THF) with a concentration of 2 mg / ml, stirred for 12 hours, and filtered through a 45nm polytetrafluoroethylene filter, Measured by gel permeation chromatography (GPC) analysis.

[0108] (3) Polymerization conversion rate (%): By drying 1 g of acrylic copolymer coagulant latex in an oven set at 135° C. for 20 minutes, measure the solid content, and then divide the measured solid content by the theoretical solid content (target TSC) to determine.

experiment example 2

[0110] The physical properties of the second butadiene rubber polymer latexes of Examples and Comparative Examples were measured by the methods described below, and the results are shown in the table.

[0111] (4) Aggregation phenomenon: When the measured amount (ppm) of aggregates is 30,000 ppm or more, or when phase separation is visually observed during stirring of the second butadiene rubber polymer latex, it is determined that aggregation occurs .

[0112] (5) Average particle diameter (nm): Measured by a dynamic light scattering method using a Nicomp 380HPL instrument (manufactured by Nicomp).

[0113] (6) Particle size distribution: Measured by a dynamic light scattering method using a Nicomp 380HPL instrument (manufactured by Nicomp).

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Abstract

The present invention relates to an acrylic copolymer coagulant and a method for preparing a graft copolymer using same, the acrylic copolymer coagulant being a copolymerized product of a monomer mixture containing a carboxylic acid-based monomer and an acrylic monomer represented by chemical formula 1, wherein the content, X, of carboxylic acid-based monomer units in the acrylic copolymer coagulant satisfies equation 1 and the average particle diameter, Y, of the acrylic copolymer coagulant satisfies equation 2. According to the present invention, a graft copolymer having excellent impact strength, surface gloss, and processability can be prepared.

Description

technical field [0001] [Cross Reference to Related Application] [0002] This application claims priority and benefit from Korean Patent Application No. 10-2019-0089774 filed on July 24, 2019, the disclosure of which is incorporated herein by reference in its entirety. [technical field] [0003] The present invention relates to an acrylic copolymer coagulant and a method for preparing a graft copolymer using the acrylic copolymer coagulant, in particular to an acrylic copolymer coagulant whose composition and average particle diameter are adjusted within a specific range and A method for preparing a graft copolymer using the acrylic acid copolymer coagulant. Background technique [0004] Acrylonitrile-butadiene-styrene copolymer (hereinafter referred to as "ABS copolymer") is formed by graft copolymerization of a butadiene rubber polymer with styrene and acrylonitrile. [0005] Compared with existing high-impact polystyrene (HIPS), ABS copolymer exhibits excellent physic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F220/06C08F279/04C08F212/08C08F220/44C08L51/04C08L25/12C08C1/15
CPCC08F220/14C08F220/1802C08F279/04C08L51/04C08C1/15C08L2207/04C08F220/06C08F212/08C08F220/44C08L25/12C08F6/22C08C1/065C08F6/18
Inventor 田喜晶金建秀黃文子金亨俊金昶會蔡旼洙
Owner LG CHEM LTD
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