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Polyacrylate redispersible latex powder and preparation method thereof

A technology of redispersing latex powder and polyacrylate, applied in the direction of coating, can solve the problems of limitation, poor water resistance of film, non-film forming, etc., and achieve the effect of reducing film forming temperature, good film forming performance and long storage period

Inactive Publication Date: 2014-11-19
广东杜威科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a patent to prepare redispersible polymer latex powder by designing and preparing emulsion with soft inside and hard outside to reduce adhesion during spray drying. At the same time, in order to meet the redispersibility of latex powder, a large amount of hydrophilic monomer is added to the shell layer; Although the prepared redispersible polymer latex powder has good fluidity and redispersibility, the water resistance of the film formed by the redispersion liquid is poor, and it does not form a film at low temperature, which limits the use of propylene ester redispersible latex powder. use

Method used

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  • Polyacrylate redispersible latex powder and preparation method thereof
  • Polyacrylate redispersible latex powder and preparation method thereof
  • Polyacrylate redispersible latex powder and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The composition of acrylate polymer emulsion includes methyl methacrylate, butyl acrylate, 2-hydroxyethyl acrylate, methacrylic acid, N-methylol acrylamide, sebacic acid dihydrazide, and its specific component formula Table 1 below:

[0052] Table 1

[0053]

[0054]

[0055] The preparation method of acrylate polymer emulsion, its step is as follows:

[0056] a. Mix the above-mentioned quality methyl methacrylate, butyl acrylate, 2-hydroxyethyl acrylate, methacrylic acid, and N-methylol acrylamide to prepare mixed monomer I and mixed monomer II. According to the FOX formula, the Tg of the copolymer composed of mixed monomer I = -21.8°C, and the Tg of the copolymer composed of mixed monomer II = 57.2°C.

[0057] b, preparation of seed emulsion: join the water accounting for 70% of the total mass of water, the emulsifier accounting for 50% of the total emulsifier quality and the initiator accounting for 45% of the initiator quality into the reactor, stir and disp...

Embodiment 2

[0070] The composition of acrylate polymer emulsion includes methyl methacrylate, butyl acrylate, isooctyl acrylate, 2-hydroxyethyl acrylate, acrylic acid, N-methylol acrylamide, adipic hydrazide, and its specific components The formula is as follows in Table 3:

[0071] table 3

[0072]

[0073]

[0074] The preparation method of acrylate polymer emulsion, its step is as follows:

[0075] a. Mix the above parts by mass of methyl methacrylate, butyl acrylate, isooctyl acrylate, 2-hydroxyethyl acrylate, acrylic acid, N-methylol acrylamide and adipic hydrazide to make a mixed unit Body I and Mixed Monomer II. According to the FOX formula, the Tg of the copolymer composed of mixed monomer I = -28.4°C, and the Tg of the copolymer composed of mixed monomer II = 67.6°C.

[0076] B, prepare seed emulsion: join the water that accounts for 75% of total water mass, the emulsifier that accounts for 55% of total emulsifier mass and the initiator that accounts for 40% of initiator...

Embodiment 3

[0089] The composition of the acrylate polymer emulsion includes ethyl methacrylate, propyl methacrylate, ethyl acrylate, butyl acrylate, 5-hydroxypentyl acrylate, methacrylic acid, N,N'-methylenebispropylene Amide, maleic hydrazide, its specific component formula is as follows table 5:

[0090] table 5

[0091]

[0092]

[0093] The preparation method of acrylate polymer emulsion, its step is as follows:

[0094] a. The ethyl methacrylate, propyl methacrylate, ethyl acrylate, butyl acrylate, 5-hydroxypentyl acrylate, methacrylic acid, N, N'-methylenebisacrylamide of the above mass parts and maleic hydrazide are mixed separately to make mixed monomer I and mixed monomer II. According to the FOX formula, the Tg of the copolymer composed of mixed monomer I = -23.2°C, and the Tg of the copolymer composed of mixed monomer II = 65.7°C.

[0095] b, preparation of seed emulsion: join the water accounting for 80% of the total mass of water, the emulsifier accounting for 60% o...

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Abstract

The invention discloses polyacrylate redispersible latex powder and a preparation method thereof. The preparation method comprises the following steps: adding 1-15 parts by weight of pH regulating agents to an emulsion which comprises 65-75 parts by weight of acrylic ester copolymers, uniformly stirring, regulating a pH value to 8-9, adding 15-20 parts by weight of drying aids, and uniformly stirring to obtain a spray drying mixture solution; preparing the polyacrylate redispersible latex powder by carrying out spray drying on the spray drying mixed solution, determining the inlet temperature of a spray dryer as 125-150 DEG C, controlling outlet temperature at 65-80 DEG C and rotating speed of a mistorizer at 21600-24000 rpm by regulating the feed speed, collecting dried powder, adding 2%-8% of anticaking agents, uniformly mixing and then filtering to obtain a final product. The polyacrylate redispersible latex powder disclosed by the invention has the advantages of high yield, low water content and good redispersible stability and especially has better film-forming property.

Description

technical field [0001] The invention relates to a redispersible latex powder, in particular to a polyacrylate redispersible latex powder and a preparation method thereof. Background technique [0002] The architectural latex paints currently used are composed of film-forming substances (polymers), pigments and fillers, additives and water, among which additives and water are used for the production and storage of coatings, accounting for more than half of the quality and price of coatings . Additives such as preservatives, thickeners, antifungal agents, and anti-sedimentation agents added to meet the storage and construction performance of paints are the main sources of environmental pollutants VOC brought by architectural paints. If architectural paints are made into dry powder, Add water and stir during use, and these additives can be omitted. The appearance of redispersible polymer latex powder makes dry powder architectural coatings possible without VOC pollution. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/08C08L33/12C08K3/34C08K3/26C08K3/36C08F220/14C08F220/18C08F220/28C08F220/58C08F2/26C08F2/30C08J3/12C09D133/08C09D133/12
Inventor 谢德龙廖慨张心亚王利宁
Owner 广东杜威科技有限公司
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