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Redispersable acrylic ester polymer emulsion powder and preparation method thereof

A technology for redispersing latex powder and acrylate, applied in the field of acrylate polymer redispersible latex powder and its preparation, can solve the problem that latex powder has a great influence on film-forming properties, poor water resistance and ionic stability, and redispersion film-forming To ensure the re-dispersibility, improve water resistance, and avoid sticking

Inactive Publication Date: 2010-04-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

U.S. Patents USP5872189 (1999-2-16), USP6224981 (2001-5-1) made the emulsion into a soft core-hard shell structure, although the agglomeration and agglomeration of the latex particles were greatly reduced, but the latex powder formed at normal temperature Membrane properties are greatly affected by the glass transition temperature (Tg) of the shell
U.S. Patent USP705553 (1998-1-6) adopts a large number of functional monomers, and the redispersibility of latex powder can be improved, but its water resistance and ion stability are poor
The existing emulsion polymerization technology is used to prepare the acrylate emulsion for polymer latex powder, because the core-shell heterogeneous structure of latex particles leads to microphase separation, large particle size of latex, etc., so that the acrylic ester redispersible latex powder is dry. Disadvantages such as low yield, poor redispersion film-forming property, and poor water resistance

Method used

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  • Redispersable acrylic ester polymer emulsion powder and preparation method thereof
  • Redispersable acrylic ester polymer emulsion powder and preparation method thereof
  • Redispersable acrylic ester polymer emulsion powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The composition of acrylate polymer emulsion comprises methyl methacrylate, butyl acrylate, 2-hydroxyethyl acrylate, methacrylic acid, and its concrete component formula is as table 1:

[0038] Table 1

[0039]

[0040] The preparation method of acrylate polymer emulsion, its step is as follows:

[0041]a. Mix the above-mentioned quality of alkyl methacrylate, alkyl acrylate, hydroxyalkyl ester and methacrylic acid respectively to prepare mixed monomer I and mixed monomer II. According to the FOX formula, the Tg of the copolymer composed of the mixed monomer I is -21.9°C, and the Tg of the copolymer composed of the mixed monomer I is 36.5°C.

[0042] B, preparation of seed emulsion: join the above-mentioned quality 60% water, 50% emulsifier and 30% initiator in the reaction kettle equipped with thermometer, agitator, feeding pipe, condensing reflux pipe, stir and disperse for 15 minutes, wait The temperature was raised to 80° C., and 10% of the mass of the monomer ...

Embodiment 2

[0056] The composition of acrylate polymer emulsion includes methyl methacrylate, ethyl methacrylate, butyl acrylate, isooctyl acrylate, 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, acrylic acid, and its specific composition The allocation party is shown in Table 3:

[0057] table 3

[0058]

[0059] The preparation method of acrylate polymer emulsion, its step is as follows:

[0060] a. Mix the above mass parts of alkyl methacrylate, alkyl acrylate, hydroxyalkyl ester and methacrylic acid respectively to prepare mixed monomer I and mixed monomer II. According to the FOX formula, the Tg of the copolymer composed of the mixed monomer I is -39.5°C, and the Tg of the copolymer composed of the mixed monomer I is 49.8°C.

[0061] b. Preparation of seed emulsion: join the above-mentioned 70% water by mass, 40% emulsifier and 50% initiator into a reaction kettle equipped with a thermometer, agitator, feeding pipe, and condensing reflux pipe, stir and disperse for 10 minute...

Embodiment 3

[0074] The composition of acrylate polymer emulsion includes ethyl methacrylate, propyl methacrylate, ethyl acrylate, butyl acrylate, 2-hydroxyethyl acrylate, 5-hydroxypentyl acrylate, methacrylic acid, its specific The component formula is shown in Table 5:

[0075] table 5

[0076]

[0077] The preparation method of acrylate polymer emulsion, its step is as follows:

[0078] a. Mix the above mass parts of alkyl methacrylate, alkyl acrylate, hydroxyalkyl ester and methacrylic acid respectively to prepare mixed monomer I and mixed monomer II. According to the FOX formula, the Tg of the copolymer composed of the mixed monomer I is -32.0°C, and the Tg of the copolymer composed of the mixed monomer I is 43.7°C.

[0079] b. Preparation of seed emulsion: join the above-mentioned 80% water by mass, 60% emulsifier and 40% initiator into a reaction kettle equipped with a thermometer, agitator, feeding pipe, and condensing reflux pipe, stir and disperse for 20 minutes, When the t...

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Abstract

The invention discloses a redispersable acrylic ester polymer emulsion powder and a preparation method thereof. The preparation method comprises the following steps: adding 1-5 parts by mass of pH regulator to 70-80 parts by mass of acrylic ester polymer emulsion, stirring evenly and regulating the pH value to be 7-10; adding 15-30 parts by mass of drying aid, and stirring evenly to obtain spray drying emulsion; setting the drying inlet temperature and the drying outlet temperature of a spray dryer respectively to be 110-150 DEG C and 60-80 DEG C, and setting the feeding speed to be 20-60 rpm and the rotating speed of a pulverizer to be 200-400 rpm; starting up a feeding system; drying the drying emulsion, and then collecting powder; and filtering to obtain the redispersable acrylic ester polymer emulsion powder. The glass transition temperature of a polymer which is contained in the acrylic ester polymer emulsion and forms a colloidal particle and the distribution of a carboxyl functional group of the polymer are in progressive change from the center of the colloidal particle to the surface. The emulsion powder obtained by the preparation method has good redispersion stability, film formation and water resistance.

Description

technical field [0001] The invention relates to a redispersible latex powder, in particular to an acrylate polymer redispersible latex powder and a preparation method thereof. Background technique [0002] The redispersible polymer latex powder is obtained from the polymer matrix emulsion through drying and powdering technology. After dispersion with water, it can reproduce the regenerated emulsion with the same properties and similar uses as the original polymer emulsion. The research on redispersible latex powder began in 1934 with the polyvinyl acetate redispersible latex powder of German I.G.Farbenindustrie A.G. company. At present, the research on the preparation of redispersible latex powder is mainly concentrated in large companies in Germany, France and the United States, such as Hoechst AG in Germany, Wacker-Chemie Gmbh in Germany, Rhodia in France, Ebnother in Switzerland, and Natinonal in the United States. Starch and Air Products. Domestic research on redispers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08F220/18C08F220/14C08F220/28C08F220/06C08F2/26
Inventor 张心亚裴勇兵黄洪陈焕钦
Owner SOUTH CHINA UNIV OF TECH
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