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Preparation method and application of internal-external dual cross-linked core-shell structured acrylic acid emulsion

A technology of acrylic emulsion and core-shell structure, applied in the direction of coating, etc., can solve the difficult problems of hardness and minimum film forming temperature, development and application restrictions, loss of water-based paint, etc., to achieve VOC emissions and improve compactness , the effect of lowering the glass transition temperature

Inactive Publication Date: 2012-12-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, there are also disadvantages such as poor film-forming property, solvent resistance, hot stickiness and cold brittleness.
Although there are many modification measures, such as silicone self-crosslinking modified acrylic emulsion, design of core-shell structure and preparation of acrylic microemulsion, it is difficult to solve the contradiction between hardness and minimum film-forming temperature. Adding too much film-forming aid will greatly increase the content of volatile organic compounds, making it lose the meaning of water-based paint, so the development and application of acrylic emulsion are limited to a certain extent

Method used

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  • Preparation method and application of internal-external dual cross-linked core-shell structured acrylic acid emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of seed monomer: Mix 4 parts by mass of butyl acrylate, 2 parts by mass of methyl methacrylate, 0.1 part by mass of methacrylic acid, and 0.18 parts by mass of trimethylolpropane trimethacrylate to obtain a seed monomer body;

[0037] (2) Preparation of seed emulsion: Take 1.28 parts by mass of compound emulsifier, 0.06 parts by mass of potassium persulfate, dissolve in 60 parts by mass of deionized water, stir well and add to Put the funnel in a four-necked flask and place it in a constant temperature water bath, heat it to 80°C at a speed of 300 rpm, then reduce the speed to 200rmp, and pass the seed monomer through a constant pressure dropping funnel within 10 minutes Add it dropwise into a four-necked flask, and keep it warm for 15 minutes until there is no obvious reflux on the bottle wall to obtain a seed emulsion; the composite emulsifier is composed of 0.96 parts by mass of DSB and 0.32 parts by mass of OP-10;

[0038](3) Preparation of core lay...

Embodiment 2

[0041] (1) Preparation of seed monomers: Mix 8 parts by mass of butyl acrylate, 5.6 parts by mass of methyl methacrylate, 0.5 parts by mass of methacrylic acid, and 0.75 parts by mass of ethylene glycol dimethacrylate to obtain seed monomers;

[0042] (2) Preparation of seed emulsion: Take 1.7 parts by mass of compound emulsifier, 0.16 parts by mass of ammonium persulfate, dissolve in 80 parts by mass of deionized water, stir well and add to funnel in a four-necked flask, and placed in a constant temperature water bath, heated to 85 °C at a speed of 400 rpm, then reduced to 160 rpm, and the seed monomer was passed through a constant pressure dropping funnel in the Drop it into a four-neck flask within 15 minutes, and keep it warm for 20 minutes until there is no obvious reflux on the bottle wall to obtain a seed emulsion; the composite emulsifier consists of 0.85 parts by mass of DSB and 0.85 parts by mass of OP-10;

[0043] (3) Preparation of core layer emulsion: Take 72 part...

Embodiment 3

[0046] (1) Preparation of seed monomers: 6.15 parts by mass of butyl acrylate, 2.76 parts by mass of methyl methacrylate, 0.24 parts by mass of methacrylic acid, and 0.4 parts by mass of dipentaerythritol acrylate were uniformly mixed to obtain seed monomers;

[0047] (2) Preparation of seed emulsion: Take 1.5 parts by mass of compound emulsifier, 0.09 parts by mass of ammonium persulfate, dissolve in 80 parts by mass of deionized water, stir well and add to funnel in a four-necked flask, and placed in a constant temperature water bath, heated to 75°C at a speed of 400 rpm, then reduced to 220 rpm, and the seed monomer passed through a constant pressure dropping funnel in Drop it into a four-neck flask within 12 minutes, and keep it warm for 15 minutes until the bottle wall has no obvious reflux to obtain a seed emulsion; the composite emulsifier consists of 0.375 parts by mass of DSB and 1.125 parts by mass of OP-10;

[0048] (3) Preparation of core layer emulsion: Take 55.35...

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Abstract

The invention discloses a preparation method and application of internal-external dual cross-linked core-shell structured acrylic acid emulsion. The method employs a multi-step pre-emulsification and polymerization process for seed emulsion to prepare the acrylic acid emulsion and mainly comprises a first step of preparation of seed monomers, a second step of seed emulsion polymerization, a third step of core emulsion polymerization and a fourth step of shell emulsion polymerization; after polymerization is finished, the pH value of the emulsion is adjusted, and adipic dihydrazide is added so as to obtain the internal-external dual cross-linked core-shell structured acrylic acid emulsion. According to the invention, polymerization stability and minimum film-forming temperature of the core-shell structured acrylic acid emulsion prepared in the invention are greatly improved; the acrylic acid emulsion is applied in the field of water-borne wood paints and can improve the cross-linking degree, density and hardness of a paint film and reduce water absorption and a glass transition temperature of the paint film.

Description

technical field [0001] The invention belongs to the field of high molecular substance synthesis, relates to emulsion polymerization technology, in particular to a preparation method and application of an acrylic emulsion with internal and external double cross-linked core-shell structures. Background technique [0002] Acrylic emulsion is a general term for copolymers of various acrylic monomers and is widely used in various industries, especially in the wood coating industry. [0003] Wood lacquer not only has decorative and beautifying effects, but also has a protective effect on wood, which can prolong the service life of wood. However, most of the wood lacquers sold in the Chinese market are still solvent-based. These wood lacquer coatings contain a large amount of toxic organic volatiles. Seriously endanger the health of production and construction personnel, and pollute the atmosphere. With the increasing awareness of environmental protection, the use of solvent-based...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F220/14C08F220/06C08F220/28C08F222/14C08F220/58C08F2/30C08F2/26C08F4/30C08K5/25C09D133/08
Inventor 黄洪张静谢德龙司徒粤
Owner SOUTH CHINA UNIV OF TECH
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