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Room temperature self-crosslinking styrene-acrylic emulsion and preparation technique thereof

A styrene-acrylic emulsion and self-crosslinking technology, which is applied in the field of polymer emulsion, can solve the problems of short storage period, unstable crosslinking active groups, and low crosslinking degree, and achieve long storage period and high crosslinking degree , prepare simple effects

Inactive Publication Date: 2011-04-20
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The self-crosslinking emulsion prepared by the above-mentioned crosslinking chemical reaction generally has prominent problems such as unstable crosslinking active groups, short storage period or low crosslinking degree.

Method used

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  • Room temperature self-crosslinking styrene-acrylic emulsion and preparation technique thereof
  • Room temperature self-crosslinking styrene-acrylic emulsion and preparation technique thereof
  • Room temperature self-crosslinking styrene-acrylic emulsion and preparation technique thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1) Synthesis of styrene-acrylic polymer emulsion P-C1 with active chlorine side groups

[0033] ① Mix 4g of ethyl acrylate (EA), 0.48g of styrene (St), 0.24g of chlorovinyl acetate (CVA), 0.725g of octylphenol polyoxyethylene ether (OP-10), 0.725g of dodecyl sulfate Sodium (SDS), 0.24g pH buffer NaHCO 3 After mixing with 34.59g deionized water, under nitrogen protection and stirring conditions, pre-emulsification at room temperature for 30 minutes;

[0034] ② Heat the obtained pre-emulsion to 70°C, add potassium persulfate (KPS) aqueous solution (containing KPS 0.12g, 6g water), after blue light appears in the system, add 37.16g ethyl acrylate and 4.36g styrene dropwise at the same time Mixed monomer with 2.18g vinyl chloroacetate and KPS aqueous solution (containing KPS 0.165g, water 8.25g), the dropwise addition time is 2h, after the dropwise addition, continue to react under nitrogen protection and stirring conditions at 70 ° C for 5 hour, add KPS aqueous solution ...

Embodiment 2

[0041] 1) Synthesis of styrene-acrylic polymer emulsion P-C2 with active chlorine side groups

[0042] ① Combine 2.3g isooctyl acrylate (OA), 3g styrene, 0.3g vinyl chloroacetate, 2.33g sodium lauryl sulfate, 0.5g pH buffer NaHCO 3 After mixing with 23.64g deionized water, under nitrogen protection and stirring conditions, pre-emulsification at room temperature for 30 minutes;

[0043] ② Heat the obtained pre-emulsion to 60°C, add potassium persulfate aqueous solution (containing 0.12g KPS, 6g water), and after the blue light appears in the system, dropwise add 20.86g isooctyl acrylate, 28.84g styrene and 2.94g The mixed monomer of g vinyl chloroacetate and KPS aqueous solution (containing KPS 0.16g, water 8.25g) were added dropwise for 2 hours. After the dropwise addition, the reaction was continued at 70°C for 5 hours under nitrogen protection and stirring conditions. KPS aqueous solution (containing KPS 0.01g, water 0.75g) was added, and kept at 80°C for 2 hours, then cool...

Embodiment 3

[0050] 1) Synthesis of styrene-acrylic polymer emulsion P-C3 with active chlorine side groups

[0051] ① Mix 3.4g of ethyl acrylate, 1g of styrene, 0.1g of chloromethylated styrene (CMSt), 0.9g of octylphenol polyoxyethylene ether, 0.9g of sodium lauryl sulfate, 0.22g of pH buffer NaHCO 3 After mixing with 32.29g of deionized water, under nitrogen protection and stirring conditions, pre-emulsification at room temperature for 30 minutes;

[0052] ② Heat the obtained pre-emulsion to 40°C, add potassium persulfate aqueous solution (including KPS 0.225g, water 10g), after blue light appears in the system, add 30.6g ethyl acrylate, 9g styrene and 1.14 chloromethane dropwise at the same time The mixed monomer of base styrene and KPS aqueous solution (containing KPS 0.2g, water 9g) were added dropwise for 1h. After the dropwise addition, the reaction was continued at 70°C for 4 hours under nitrogen protection and stirring conditions, and KPS was added. Aqueous solution (containing K...

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Abstract

The invention relates to a room temperature self-crosslinking styrene-acrylic emulsion and a preparation technique thereof, belonging to the field of polymer emulsion. The polymerization formulation of the room temperature self-crosslinking styrene-acrylic emulsion comprises the following components with the mass percentage: 40-45% of non-functional monomer, 0.3-3.5% of functional monomer, 0.2-0.45% of initiator, 0.8-1.7% of emulsifying agent, 0.2-0.6% of pH buffering agent and the rest of de-ionized water. The invention adopts emulsion polymerization technology to respectively prepare styrene-acrylic polymer emulsion with active chlorine pendant group and styrene-acrylic polymer emulsion with tertiary amine pendant group and then the two emulsions are mixed together at the room temperature according to the mass ratio of 1:10-10:1, so that the room temperature self-crosslinking styrene-acrylic emulsion can be obtained. The room temperature self-crosslinking styrene-acrylic emulsion has the advantages of high degree of cross linking, good storage stability and the like, and the tensile strength of film coating reaches more than 10MPa. The room temperature self-crosslinking styrene-acrylic emulsion has wide application value in the aspects such as paint, bonding agent, acrylate rubber, etc.

Description

technical field [0001] The invention belongs to the field of polymer emulsions, in particular to a room temperature self-crosslinking styrene-acrylic emulsion and a preparation process thereof. Background technique [0002] At present, most of the emulsion polymers are thermoplastic, so there are still some problems in their anti-adhesion, stain resistance, solvent resistance and heat resistance. During emulsion polymerization, functional groups that can realize cross-linking are introduced, so that the obtained polymer emulsion is cross-linked when film-forming and drying after coating, forming a three-dimensional network structure, which overcomes the above shortcomings and better meets the requirements of use. Water-based self-crosslinking coatings are one of the development directions of coatings and one of the hot spots of current development and research. Taking into account the construction environment of the coating, energy saving and ease of use and other factors, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/18C08F220/14C08F212/08C08F218/08C08F212/14C08F220/34C08F226/06C08F2/24
Inventor 陈晓农高闪任芳苏志强石淑先兰岚
Owner BEIJING UNIV OF CHEM TECH