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Self-crosslinking type vinyl chloride copolymer emulsion and preparation method thereof

A vinyl chloride copolymerization and self-crosslinking technology, which is applied in coatings, anti-corrosion coatings, etc., can solve problems such as poor chemical resistance, unsatisfactory hydrolytic stability of formulated varnishes and paints, and hazards to human health and the natural environment , to achieve the effect of improving high temperature resistance, ensuring storage stability, and avoiding the phenomenon of anti-coarseness

Active Publication Date: 2019-02-22
WUXI HONGHUI NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional solvent-based alkyd resin coatings have disadvantages such as poor chemical resistance, low hardness, and poor weather resistance, and the organic solvent content of traditional alkyd resins is about 50%
These organic solvents will be discharged into the atmosphere during the construction stage and drying process, causing great harm to human health and the natural environment.
[0004] The relative molecular mass of water-based alkyd resin is lower than that of the corresponding solvent-based alkyd resin. In addition to the slow drying speed, the hardness, water resistance and solvent resistance of the paint film are poor. The hydrolytic stability is also unsatisfactory

Method used

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  • Self-crosslinking type vinyl chloride copolymer emulsion and preparation method thereof
  • Self-crosslinking type vinyl chloride copolymer emulsion and preparation method thereof
  • Self-crosslinking type vinyl chloride copolymer emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] 1. Total monomer embodiment

[0032]

[0033] 2. Example of Self-crosslinking Vinyl Chloride Copolymer Emulsion

[0034]

[0035] 3. Embodiment 1-9 and comparative example 1-3 are prepared according to the following method self-crosslinking type vinyl chloride copolymer emulsion, and its specific steps are as follows:

[0036] (1) monomer pre-emulsification

[0037] Weigh vinyl chloride, vinylidene chloride, acrylate, cross-linking monomer, and non-reactive emulsifier, put them into a pre-emulsification tank, and stir and emulsify for 1 hour at a stirring speed of not less than 200r / min to obtain pre-emulsified Monomer solution;

[0038] (2) Preparation and addition of additives: Take 70-160 parts of deionized water, reactive emulsifier, pH buffer, and glue-preserving agent, stir and dissolve fully, then add to step (1) pre-emulsification kettle; take initiator and dissolve in 10 -80 parts of water for standby;

[0039] (3) Reaction: by volume, first take 1 / 5 ...

preparation example 1

[0056] (1) monomer pre-emulsification

[0057] The total number of monomers is 100 parts, weigh 35% of vinyl chloride, 30% of vinylidene chloride, 24.7% of butyl acrylate, 10% of diacetone acrylamide, and 1 part of nonylphenol polyoxyethylene ether, and put them into the pre-emulsification kettle , under the condition that the stirring speed is 200r / min, stir and emulsify for 1h to obtain a pre-emulsified monomer solution;

[0058] (2) Preparation and addition of additives: Take 120 parts of deionized water, 0.5 part of allyl alkyl alcohol ether sulfate, 0.5 part of sodium bicarbonate, and 0.4 part of polyvinylpyrrolidone, stir and dissolve and then add the step ( 1) in the pre-emulsification kettle; get ammonium persulfate and dissolve it in 30 parts of water for subsequent use;

[0059] (3) Reaction: by volume, first take 1 / 5 of the pre-emulsified monomer in step (1) in the polymerization kettle, stir for 30-50 minutes and then heat up to 75±1°C, then add the dissolved mono...

preparation example 2

[0061] Others are the same as Preparation Example 1, except that the stirring speed in step (1) is 180r / min. Its vinyl chloride conversion rate is 97.2%, the emulsion particle size is 0.1-0.25μm, and the average molecular weight is 17.6×10 4 g / mol.

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Abstract

The invention belongs to the technical field of industrial coatings, and relates to self-crosslinking type vinyl chloride copolymer emulsion. The self-crosslinking type vinyl chloride copolymer emulsion is prepared from the following raw materials in parts by weight: 100 parts of a total monomer, 1-5 parts of an emulsifier, 0. 5-2 parts of a pH buffer, 0.05-0.5 part of an initiator and 80-230 parts of deionized water, wherein the total monomer consists of the following components in percentage by weight: 35-60% of vinyl chloride, 15-30% of vinylidene chloride, 5-25% of an acrylate monomer, 2-10% of a cross-linking monomer and 015-0.5% of an auxiliary. The invention provides a preparation method for preparing the self-crosslinking type emulsion by copolymerizing the vinylidene chloride, theacrylate and the crosslinking monomer with vinyl chloride as a main monomer; and according to the method, a polymer structure is adjusted through optimizing an emulsifier system and a polymerizationprocess so as to obtain the vinyl chloride copolymer emulsion which can effectively replace alkyd resins to be used in industrial anticorrosive coatings.

Description

technical field [0001] The invention relates to a preparation method of a self-crosslinking vinyl chloride copolymer emulsion, and mainly relates to a vinyl chloride copolymer emulsion used for metal anticorrosion coatings instead of alkyd resin. The invention belongs to the technical field of industrial coatings. Background technique [0002] Alkyd resin is the most important resin used in coatings, and its consumption has always occupied the first place in resins used in the coatings industry. Alkyd resin can be formulated with other resins to form a variety of metal anti-corrosion coatings with different properties. Because of its weather resistance, good adhesion, brightness, and plumpness, it is widely used in bridges and other buildings as well as machinery, vehicles, ships, aircraft, Meter etc. coating. [0003] Traditional solvent-based alkyd resin coatings have disadvantages such as poor chemical resistance, low hardness, and poor weather resistance, and the organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/06C08F214/08C08F220/14C08F220/18C08F220/20C08F2/26C08F2/30C09D127/06C09D5/08
CPCC09D127/06C08F2/26C08F2/30C08F214/06C09D5/08C08F214/08C08F220/1808C08F220/1804
Inventor 项洪伟李福增孙凌张义忠
Owner WUXI HONGHUI NEW MATERIALS TECH
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