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Self-crosslinking silicone-acrylate copolymer emulsion and preparation method

A polymer emulsion, self-crosslinking technology, applied in the direction of coating, etc., can solve the problems of poor stability, poor stain resistance, etc., to improve product cost performance, excellent stain resistance, good reaction stability and storage stability Effect

Active Publication Date: 2013-01-30
建德市新安有机硅新材料研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor stability of the silicone-acrylic polymer emulsion and low silicon content resulting in poor water resistance and stain resistance of the coating film, the present invention provides a self-crosslinking silicone-acrylic polymer emulsion. The emulsion has good reaction and storage stability. The silicon content and functional group distribution of the colloidal particles gradually increase from 60-80% of the colloidal particle radius to the surface, giving full play to the role of the silicone chain segment and improving the cost performance of the product

Method used

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  • Self-crosslinking silicone-acrylate copolymer emulsion and preparation method
  • Self-crosslinking silicone-acrylate copolymer emulsion and preparation method
  • Self-crosslinking silicone-acrylate copolymer emulsion and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) The components of the self-crosslinking silicone acrylic polymer emulsion are shown in Table 1 below:

[0045]

[0046] (2) Mix the above-mentioned methyl methacrylate, butyl acrylate, 2-hydroxyethyl acrylate and vinyltriethoxysilane respectively to prepare monomer I, monomer II and monomer III;

[0047] (3) Preparation of seed emulsion: Add 80% of the above-mentioned deionized water, 70% of the mixture of SDS and AMPS, 60% of the mixture of potassium persulfate and sodium bisulfite, sodium bicarbonate, and propylene glycol to a thermometer equipped with , stirrer, feeding tube, and condensing reflux tube, stir and disperse for 15 minutes, wait for the temperature to rise to 68 ° C, drop the monomer I within 3 hours, and keep warm for 15 minutes after the dropping to make a seed emulsion ;

[0048] (4) Within 1.5 hours, slowly add monomer III to monomer II and keep stirring to mix evenly, then mix the mixture of monomer II and monomer III and the remaining deion...

Embodiment 2

[0052] (1) The components of the self-crosslinking silicone acrylic polymer emulsion are shown in Table 2 below:

[0053]

[0054] (2) The above-mentioned methyl methacrylate, ethyl methacrylate, butyl acrylate, pentyl acrylate, 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, γ-methacryloxypropyl Trimethoxysilane was mixed separately to make monomer I, monomer II and monomer III;

[0055] (3) Preparation of seed emulsion: 70% of the above mass of deionized water, 65% of the mass of the mixture of DBS and HAPS, 50% of the mass of the mixture of ammonium persulfate and potassium bisulfite, sodium bicarbonate, 1,4 butanediol Add it into the reaction kettle equipped with a thermometer, agitator, feeding tube, and condensing reflux tube, stir and disperse for 10 minutes, wait until the temperature rises to 65°C, drop the monomer I in 3.5 hours, and keep it warm for 20 minutes after the dropping is completed. Make seed emulsion;

[0056] (4) Within 2 hours, slowly add monome...

Embodiment 3

[0060] (1) The components of the self-crosslinking silicone acrylic polymer emulsion are shown in Table 3 below:

[0061]

[0062] (2) Mix the above-mentioned ethyl methacrylate, propyl methacrylate, butyl acrylate, 2-hydroxyethyl acrylate, 5-hydroxypentyl acrylate and vinyl tributoxysilane to make a mixed unit Body I, Mixed Monomer II and Mixed Monomer III;

[0063] (3) Preparation of seed emulsion: the above-mentioned 75% deionized water, LAS and AMPS-NH 4 60% of the mass of the mixture, 70% of the mass of the mixture of potassium persulfate and sodium bisulfite, potassium bicarbonate, and low molecular weight polyethylene glycol with a degree of polymerization of 400 are added to the reaction equipped with a thermometer, agitator, feeding tube, and condensing reflux tube In the kettle, stir and disperse for 20 minutes. When the temperature rises to 70 °C, add the mixed monomer I dropwise in 4 hours, and keep it warm for 30 minutes after the dropwise addition to make a s...

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Abstract

The invention relates to the organic compound technical field, which solves the problems of poor stability of the silicone-acrylate copolymer emulsion and poor water resistance and stain resistance performances of a film due to low silicon content. The invention relates to a self-crosslinking silicone-acrylate copolymer emulsion which comprises the following components by mass percentages: 10.0-30.0% of methacrylic acid alkylester, 15.0-30.0% of alkyl acrylate, 5-15% of organosiloxane, 0.5-2.5% of alkyl ester, 1.0-5.0% of organosilicone hydrolysis inhibitor, 0.5-2.0% of pH modifier, 0.5-2.0% of emulsifier, 0.5-1.0% of initiator and 40.0-60.0% of water. The emulsion good reaction and storage stability, the silicon content used for constituting colloidal particles and its functional group distribution is gradually increased from 60-80% of colloidal particle radius to the surface, the organosilicone segment function can fully performed, and the cost performance of product is enhanced.

Description

technical field [0001] The invention relates to the technical field of organic compounds, in particular to a self-crosslinking silicone acrylic polymer emulsion for building exterior walls and a preparation method thereof. Background technique [0002] With the development of high-rise and large-scale buildings, higher requirements are put forward for the weather resistance, stain resistance and scrub resistance of high-rise building coatings. Generally, the coating cycle of building exterior wall coatings is required to be at least Over 15 years. Acrylic resins usually have good weather resistance, gloss retention and good film-forming properties, but lack of cross-linking points on the linear molecules, making it difficult to form a three-dimensional network cross-linked coating film, resulting in poor high temperature resistance, easy sticking back at high temperatures, low temperature The coating film tends to be brittle and lacks elasticity. And, the general service l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/14C08F220/28C08F230/08C08F2/24C08F2/26C09D133/12C09D133/08
Inventor 裴勇兵吴连斌钟颖汤龙程陈遒蒋剑雄
Owner 建德市新安有机硅新材料研究所
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