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Waterborne resin, preparation method of waterborne resin, and waterborne paint

A water-based resin and resin technology, applied in the direction of coating, etc., can solve the problems of poor pigment dispersion and encapsulation, poor wood permeability, etc., and achieve the effect of improving the gloss, dispersibility and encapsulation of the coating film

Inactive Publication Date: 2018-04-20
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this resin is also prepared by emulsion polymerization, and a large amount of emulsifier is added during the preparation process. In order to avoid foam during construction, and the migration of emulsifier causes the adhesion of the coating film to decrease, it is necessary to add a defoamer; and due to the molecular weight of the resin High (about hundreds of thousands), there are problems such as poor permeability to wood, poor dispersion and encapsulation of pigments, etc., need to add wetting agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The invention provides a kind of preparation method of waterborne resin, comprises the following steps:

[0025] (1) Self-crosslinking acrylic resin is provided, which contains self-crosslinking groups, the number average molecular weight of the self-crosslinking acrylic resin is 1000-10000, and the carboxyl content is more than 25 mgKOH / g;

[0026] (2) mixing the self-crosslinking acrylic resin in the step (1) with a neutralizer and water to obtain a water-based acrylic resin;

[0027] (3) The water-based acrylic resin obtained in the step (2) is mixed with an initiator and a non-hydrophilic unsaturated monomer, and the polymerization reaction obtains a core-shell structure water-based acrylic resin; the non-hydrophilic unsaturated monomer includes Acrylic acid monomers and / or styrene not containing carboxyl and amino groups; the shell layer of the core-shell structure is the self-crosslinking acrylic resin described in step (1), and the core layer of the core-shell st...

Embodiment 1

[0082] (1) First, methyl methacrylate, butyl acrylate, methacrylic acid and diacetone acrylamide (DAAM) are mixed according to the mass ratio of 75:10:10:5 to obtain a monomer mixture, add n-butanol, add Oily initiator TBPO and molecular weight regulator (alpha-methylstyrene linear dimer), the mass ratio of monomer mixture, n-butanol, initiator and molecular weight regulator is 100:25:5:3, at 120 By solution polymerization at ℃ for 180min, an acrylic resin with a carboxyl content of 65mgKOH / g and a number average molecular weight of 1000-10000 was synthesized;

[0083] Mix with triethylamine and neutralize to form a salt, add 300mL water to disperse, remove the organic solvent in vacuum at 60°C and -0.098MPa to obtain a water-based acrylic resin with a number average molecular weight of 6000, T g 80℃; solid content is 25%;

[0084] (2) Add a water-based initiator to the above-mentioned water-based acrylic resin, then add methyl methacrylate, butyl acrylate, and monomers conta...

Embodiment 2

[0088] (1) Put gelatin, water and molecular weight regulator (mercaptoethanol) into the reaction kettle, put in mixed monomers, stir at high speed for 1 hour, slowly heat up to 80°C, add oily initiator AIBN, react at 80°C for 2 hours; vacuumize Recover the unreacted monomer, centrifuge and dehydrate, and dry to obtain a solid resin;

[0089]Wherein, gelatin: water: molecular weight regulator: mixed monomer: initiator=1:56:0.2:40:3.0; mixed monomer is: methyl methacrylate: styrene: isooctyl acrylate: methacrylic acid: AAEM=60:18:10:6,T g =70°C, the molecular weight is 8000, and the acid value is 78mgKOH / g;

[0090] Add 25g of solid resin to 72g of aqueous solution containing 3.1g of N,N-dimethylethanolamine, heat it to 80°C to dissolve it completely, and the solid content is 25%;

[0091] (2) Add a water-based initiator to the above-mentioned water-based acrylic resin, then add ethyl acrylate, butyl acrylate, and monomers containing two unsaturated double bonds to polymerize ...

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Abstract

The invention provides a preparation method of a waterborne resin. The preparation method comprises the following steps: mixing a self-crosslinking acrylic resin with a neutralizing agent to obtain awaterborne acrylic resin, wherein the self-crosslinking acrylic resin contains a self-crosslinking group, the number-average molecular weight is 1000-10000, and the carboxyl group content is 25 mg KOHper gram; mixing with an initiator and a non-hydrophilic unsaturated monomer, conducting a polymerization reaction to obtain a core-shell structure waterborne acrylic resin; then mixing with the neutralizing agent, and mixing with a crosslinking agent to obtain the waterborne resin. The waterborne resin with certain molecular weight is prepared first as an emulsifying agent, no extra low-molecular-weight emulsifying agent is added, the foam caused in the construction and the reduction of the adhesive force of a paint film caused by the transferring of the emulsifying agent are avoided, as a resin shell layer in the waterborne resin is the low-molecular-weight water-soluble acrylic resin, the molecule has excellent motion performance, the permeability in the wood is good, the fullness of the paint film is high, the dispersibility and the wrapping property for a pigment are good, and the glossiness of the paint film of the waterborne resin is improved.

Description

technical field [0001] The invention relates to the technical field of water-based resin preparation, in particular to a water-based resin, a preparation method thereof and a water-based paint. Background technique [0002] The total output of China's coatings has ranked among the top in the world, and has made great progress in terms of variety, quality, and technical equipment. However, with the continuous enhancement of people's awareness of environmental protection, the coatings industry is facing unprecedented challenges, and more and more attention has been paid to the research of water-based coatings. At present, the water-based resins used in the fields of architectural coatings, glass coatings, wood coatings, plastic coatings and water-based inks mainly include the following: water-based polyurethane resin, water-based polyester resin, water-based epoxy resin and water-based acrylic resin; from the packaging type It can also be divided into one-component and two-co...

Claims

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Application Information

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IPC IPC(8): C08F265/06C08F220/14C08F220/18C08F220/06C08F220/58C08F222/14C08F289/00C08F212/08C08F220/28C08F285/00C08F222/20C08J3/24C09D151/00
CPCC09D151/003C08F220/14C08F265/06C08F285/00C08F289/00C08J3/24C08J2351/00C08F220/282C08F222/102C08F220/1804C08F220/06C08F220/58C08F220/1802C08F220/1808
Inventor 张继德段艳华
Owner HUNAN UNIV OF TECH
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