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A kind of preparation method of cross-linked aqueous acrylic acid emulsion

A water-based acrylic emulsion technology, which is applied in the field of preparation of cross-linked water-based acrylic emulsion, can solve problems such as limited application, and achieve the effect of solving yellowing and good wear resistance

Active Publication Date: 2019-03-19
厦门市禾合科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a contradiction between low-temperature film-forming and high hardness in water-based acrylic resin coatings, which limits its wide application.

Method used

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  • A kind of preparation method of cross-linked aqueous acrylic acid emulsion

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, mix 100 parts of glutaraldehyde aqueous solution and 70 parts of methanol, adjust the pH value to 1-2 with dilute hydrochloric acid, reflux at 60°C for 1 hour, cool to room temperature, add 70 parts of 30% formaldehyde aqueous solution and 1 part of Na 2 CO 3 , heated up again to 90° C. for reflux for 2 hours, cooled down and discharged. Unreacted methanol and formaldehyde were distilled off under reduced pressure, and water was added to obtain a modified glutaraldehyde crosslinking agent with a concentration of 20%.

[0024] Add 140 parts of water, 1 part of sodium dodecylbenzenesulfonate, and 2 parts of OP-10 emulsifier into the pre-emulsification tank, start stirring, raise the temperature to 40-50°C, and evenly add 9 / 10 of acrylate mono Liquid mixture (106 parts of butyl acrylate, 86 parts of methyl methacrylate, 8 parts of methacrylic acid and 3.55 parts of acrylamide), dripping in 0.5~1h. Add 80 parts of water, 0.5 parts of sodium dodecylbenzene sulfonate...

Embodiment 2

[0026] First, mix 100 parts of glyoxal aqueous solution and 70 parts of methanol, adjust the pH value to 1-2 with dilute hydrochloric acid, reflux at 60°C for 1 hour, cool down to room temperature, add 70 parts of 30% formaldehyde aqueous solution and 1 part of Na 2 CO 3 , heated up again to 90° C. for reflux for 2 hours, cooled down and discharged. Unreacted methanol and formaldehyde were distilled off under reduced pressure, and water was added to obtain a modified glyoxal crosslinking agent with a concentration of 20%.

[0027] Add 140 parts of water, 0.75 parts of sodium lauryl sulfate, and 0.75 parts of OP-10 emulsifier into the pre-emulsification tank, start stirring, raise the temperature to 40-50°C, and evenly add 9 / 10 acrylate monomer dropwise to mix Liquid (113 parts of butyl methacrylate, 10 parts of methyl methacrylate, 10 parts of diethylene glycol diacrylate, 40 parts of styrene, 20 parts of methacrylic acid, 7 parts of acrylamide), drop in 0.5-1h . Add 80 par...

Embodiment 3

[0029] First, mix 100 parts of succinic dialdehyde aqueous solution and 70 parts of methanol, adjust the pH value to 1-2 with dilute hydrochloric acid, reflux at 60°C for 1 hour, cool to room temperature, add 70 parts of 30% formaldehyde aqueous solution and 1 part of Na 2 CO 3 , heated up again to 90° C. for reflux for 2 hours, cooled down and discharged. Unreacted methanol and formaldehyde were distilled off under reduced pressure, and water was added to obtain a modified succinaldehyde crosslinking agent with a concentration of 20%.

[0030] Add 140 parts of water, 0.6 parts of dodecyl diphenyl ether sulfonic acid disodium salt, 2.4 parts of TX-100 emulsifier into the pre-emulsification tank, start stirring, raise the temperature to 40-50°C, and evenly add 9 / 10 Acrylic monomer mixture (95 parts of butyl acrylate, 10 parts of hydroxyethyl acrylate, 10 parts of isobornyl methacrylate, 40 parts of methyl methacrylate, 30 parts of α-methylstyrene, 10 parts of acrylic acid , m...

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Abstract

The invention discloses a preparation method of a cross-linked water-based acrylic emulsion. It comprises the following steps: A, preparation of modified dialdehyde cross-linking agent; the general formula of said dialdehyde cross-linking agent is CHO-R-CHO, wherein R is a linear or branched alkyl group, or linear or branched The aryl group of chain; B, prepare the acrylate copolymer emulsion containing amino functional group; C, add the modified dialdehyde cross-linking agent that A step gains in the acrylate copolymer emulsion that B step gains, obtain cross-linked aqueous acrylic acid emulsion , the cross-linking reaction formula is: 2P‑NH 2 +CHO‑R‑CHO→P‑N=CH‑R‑CH=N‑P+H 2 O. The cross-linked coating film obtained by the invention has good abrasion resistance, chemical resistance, water resistance and tensile strength, and successfully solves the problem of yellowing.

Description

technical field [0001] The invention relates to a preparation method of cross-linked water-based acrylic emulsion. Background technique [0002] Due to its low VOC, water-based coatings are an important direction for the development of environmentally friendly coatings. Acrylic resin water-based coatings have attracted much attention due to their excellent weather resistance, acid and alkali resistance, and water resistance. However, there is a contradiction between low-temperature film-forming and high hardness in water-based acrylic resin coatings, which limits its wide application. In order to solve this problem, the most effective way is to introduce a cross-linking agent to make the molecules form a cross-linked structure. If the emulsion polymer film can form a cross-linked structure, it can not only improve the physical and chemical stability of the coating film, but also improve its tensile strength and wear resistance. Contents of the invention [0003] The obj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08K5/07C08L33/08C08L33/12C08L25/14C08F220/18C08F220/14C08F220/06C08F220/56C08F212/08C08F222/14C08F212/12C08F220/28C08F222/38
CPCC08F212/08C08F220/14C08F220/18C08J3/24C08K5/07C08J2333/08C08F220/1804C08L33/08C08L33/12C08L25/14C08F220/1812C08F220/06C08F222/385C08F220/56C08F222/102C08F220/281C08F220/58C08F220/1808C08F212/12
Inventor 高屹陈佳宁
Owner 厦门市禾合科技有限公司
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