Method for preparing crosslinking waterborne acrylic emulsion

A technology of water-based acrylic acid and acrylate, 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: 2017-02-22
厦门市禾合科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a contradiction between low-temperature film-forming and high h

Method used

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  • Method for preparing crosslinking waterborne acrylic emulsion

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Example Embodiment

[0022] Example 1

[0023] First, mix 100 parts of glutaraldehyde aqueous solution and 70 parts of methanol, adjust the pH to 1-2 with dilute hydrochloric acid, reflux for 1 hour at 60°C, cool to room temperature, add 70 parts of 30% formaldehyde aqueous solution and 1 part of Na 2 CO 3 , The temperature is raised again to 90 ℃ and refluxed for 2h, and the temperature is discharged. The unreacted methanol and formaldehyde were removed by distillation 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 dodecylbenzene sulfonate and 2 parts of OP-10 emulsifier into the pre-emulsification tank, turn on the stirring, heat up to 40~50℃, and evenly add 9 / 10 of the acrylate monomer dropwise. The body mixture (106 parts of butyl acrylate, 86 parts of methyl methacrylate, 8 parts of methacrylic acid and 3.55 parts of acrylamide), drip in 0.5-1h. Add 80 parts of water,...

Example Embodiment

[0025] Example 2

[0026] First, mix 100 parts of glyoxal aqueous solution and 70 parts of methanol, adjust the pH 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 , The temperature is raised again to 90 ℃ and refluxed for 2h, and the temperature is discharged. The unreacted methanol and formaldehyde were removed by distillation 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, turn on the stirring, heat up 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), 0.5~...

Example Embodiment

[0028] Example 3

[0029] First, mix 100 parts of succinaldehyde aqueous solution and 70 parts of methanol, adjust the pH to 1-2 with dilute hydrochloric acid, reflux for 1 hour at 60°C, cool to room temperature, add 70 parts of 30% formaldehyde aqueous solution and 1 part of Na 2 CO 3 , The temperature is raised again to 90 ℃ and refluxed for 2h, and the temperature is discharged. The unreacted methanol and formaldehyde were removed by distillation 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 sulfonate disodium salt and 2.4 parts of TX-100 emulsifier into the pre-emulsification tank, turn on the stirring, heat up to 40-50℃, and add 9 / 10 evenly Acrylate 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 p...

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Abstract

The invention discloses a method for preparing crosslinking waterborne acrylic emulsion. The method comprises the following steps that A, a modified dialdehyde crosslinking agent is prepared, wherein the general formula of the dialdehyde crosslinking agent is CHO-R-CHO, R is an alkyl group of a linear chain or branched chain or an aryl group of a linear brain or branched chain; B, acrylate copolymer emulsion containing amino functional groups is prepared; C, the modified dialdehyde crosslinking agent obtained in the step A is added into the acrylate copolymer emulsion obtained in the step B, the crosslinking waterborne acrylic emulsion is obtained, and the crosslinking reaction equation is 2P-NH2+CHO-R-CHO-P-N=H-R-CH=N-P+H2O. An obtained crosslinking film has good abrasion resistance, chemical resistance, water resistance and tensile strength, and the problem of yellowing is successfully solved.

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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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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