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Preparation method of oxidized crosslinking type waterborne acrylic emulsion

A water-based acrylic, oxidative cross-linking technology, applied in the direction of coating, can solve the problems of poor water resistance and solvent resistance of the coating film, low gloss of the coating film, hot sticking and cold brittleness of the coating film, etc. Effect of gloss, improved dryness and water resistance

Inactive Publication Date: 2018-04-24
SHANGHAI HUAYI FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Water-based acrylic coatings have fast drying, good weather resistance, excellent gloss and color retention, good storage stability, and relatively low price. They are most commonly used in water-based industrial coatings. However, there are still water-based acrylic industrial coatings on the market. The following disadvantages: 1. Water-based acrylic coatings have poor permeability to the substrate, which makes the adhesion between the film and the substrate worse after film formation; 2. Water-based acrylic coatings mainly rely on physical film formation, and the water resistance and Poor solvent resistance and poor anti-rust performance; 3. The coating film has low gloss and poor fullness; 4. The phenomenon of "hot stickiness and cold brittleness" of the coating film is serious

Method used

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  • Preparation method of oxidized crosslinking type waterborne acrylic emulsion
  • Preparation method of oxidized crosslinking type waterborne acrylic emulsion
  • Preparation method of oxidized crosslinking type waterborne acrylic emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The acrylic resins A1-A3 with high hydroxyl value were prepared, and the formulations are shown in Table 1.

[0021] According to the data in Table 1, the method of one-time feeding is adopted, styrene and allyl alcohol are put into the autoclave, and 3% of the total weight of dicumyl peroxide is added as the initiator, at 135 ~ 145 ° C The polymerization is carried out in an autoclave for 1.5 to 3 hours to obtain an acrylic resin A with a high hydroxyl value.

[0022] Table 1 prepares the formula unit of acrylic resin A1~A3 with high hydroxyl value: parts by weight

[0023]

Embodiment 2

[0025] Materials B1-B4 were prepared, and the formulations are shown in Table 2.

[0026] According to the data in Table 2, in the case of nitrogen protection, the acrylic resin A with high hydroxyl value and the air-drying vegetable oil fatty acid were esterified at 240-250°C for 6-7 hours until the acid value was less than 5mgKOH / g until material B is obtained.

[0027] Formulation unit of table 2 preparation materials B1~B4: parts by weight

[0028] raw material name

Embodiment 3

[0030] Materials C1-C4 were prepared, and the formulations are shown in Table 3.

[0031] According to the data in Table 3, react material B with maleic anhydride at 120-130° C. for 4-5 hours, and then dilute with co-solvent to obtain material C.

[0032] Formulation unit of table 3 preparation materials C1~C4: parts by weight

[0033] raw material name

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Abstract

The invention relates to a preparation method of oxidized crosslinking type waterborne acrylic emulsion, wherein the method includes steps of a), preparing acrylic resin A with high hydroxyl value, wherein the hydroxyl value is 120-260 mgKOH / g; b), performing esterification reaction on acrylic resin A with high hydroxyl value and air-seasoning plant oil fatty acid under the temperature of 240-250DEG C until the acid value is less than 5mg KOH / g, and so as to obtain a material B; c), reacting the material B with maleic anhydride at 120-130 DEG C for 4-5 hours; then diluting it by cosolvent toobtain a material C; d), neutralizing the material C by ammonium hydroxide with concentration of 25%, adjusting the pH value of the material system to 8-9 so as to obtain a material D; e), diluting the material D by deionized water and then adding initiator; dropwise adding (methyl) propylene ester or vinyl monomer; performing free radical polymerization reaction to obtain the oxidized crosslinking type waterborne acrylic emulsion. The waterborne coating prepared by the emulsion is featured by quick drying, high gloss, good water resistance, good adhesive force and high hardness.

Description

technical field [0001] The invention relates to a preparation method of an oxidation-crosslinking water-based acrylic emulsion, and the water-based acrylic emulsion can be used to prepare water-based industrial coatings. Background technique [0002] Water-based acrylic coatings have fast drying, good weather resistance, excellent gloss and color retention, good storage stability, and relatively low price. They are most commonly used in water-based industrial coatings. However, there are still water-based acrylic industrial coatings on the market. The following disadvantages: 1. Water-based acrylic coatings have poor permeability to the substrate, which makes the adhesion between the film and the substrate worse after film formation; 2. Water-based acrylic coatings mainly rely on physical film formation, and the water resistance and Poor solvent resistance and poor anti-rust performance; 3. The coating film has low gloss and poor fullness; 4. The phenomenon of "hot stickines...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F257/02C08F220/18C08F222/14C09D151/00
CPCC09D151/003C08F257/02C08F222/102C08F220/1804
Inventor 赵其中刘卫峰
Owner SHANGHAI HUAYI FINE CHEM CO LTD