Small-particle-size carboxylic styrene-butadiene latex and its preparation method

A technology of carboxylated styrene-butadiene latex and small particle size, which can be used in coatings, paper coatings, textiles and papermaking, etc. It can solve the problems that the particle size of latex cannot be adjusted and affects the fluidity of latex, and achieves excellent mechanical stability and chemical stability. The effect of stability, good fluidity and simple process

Active Publication Date: 2012-11-21
WEIFANG LANLI NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of the latex synthesized by this scheme cannot be adjusted, which makes the particle size distribution of the latex concentrated, which affects the good fluidity, mechanical stability and chemical stability of the latex.

Method used

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  • Small-particle-size carboxylic styrene-butadiene latex and its preparation method
  • Small-particle-size carboxylic styrene-butadiene latex and its preparation method
  • Small-particle-size carboxylic styrene-butadiene latex and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A, raw material components of seed latex and preparation method thereof:

[0031] 1. seed latex comprises the raw material component of following parts by weight:

[0032] Soft water: 250-350 parts, Butadiene: 10-30 parts, Styrene: 70-90 parts, Composite emulsifier: 10-15 parts, Initiator: 0.2-1.2 parts, Molecular weight regulator: 0.1-0.6 parts, As well as electrolytes, chelating agents and pH buffers required for emulsion polymerization;

[0033] ②The preparation method of seed latex:

[0034] After evacuating the polymerization tank, put in the above soft water, compound emulsifier, molecular weight regulator, pH buffer, butadiene, styrene, and electrolyte and chelating agent required for emulsion polymerization. After heating up to 40-60°C, add initiator agent, react for 10-15 hours, react until the conversion rate reaches more than 98%, and then cool down to below 30°C to synthesize seed latex;

[0035] B, raw material components of carboxylated styrene-butadien...

Embodiment 2

[0044] The raw material components of the seed latex and the carboxylated styrene-butadiene latex and the preparation method thereof are similar to the above-mentioned embodiment 1, and are not repeated herein.

[0045]In the above-mentioned Example 2, the molecular weight regulator, compound emulsifier, unsaturated carboxylic acid, and functional monomers are all similar to those in Example 1, and will not be repeated here.

[0046] The small-diameter carboxylated styrene-butadiene latex prepared by the above-mentioned preparation method has a particle diameter of 80-100nm.

[0047] As one of the most optimized technical solutions, in the present embodiment 2, soft water is 310kg in the preparation of seed latex, and composite emulsifier is 11kg, and butadiene is 15kg, and styrene is 85kg, and initiator is 0.4kg, and reaction temperature The temperature is 48°C, and the reaction time is 14 hours; the preparation of carboxylated styrene-butadiene latex is 12kg of seed latex, a...

Embodiment 3

[0049] The raw material components of the seed latex and the carboxylated styrene-butadiene latex and the preparation method thereof are similar to those of the above-mentioned embodiment 1 or 2, and are not repeated herein.

[0050] In the above-mentioned embodiment 3, the molecular weight regulator, complex emulsifier, unsaturated carboxylic acid, and functional monomers are all similar to those in embodiment 1 or 2, and will not be repeated here.

[0051] The small-diameter carboxylated styrene-butadiene latex prepared by the above-mentioned preparation method has a particle diameter of 80-100nm.

[0052] As one of the most optimized technical solutions, in the present embodiment 3, soft water is 330kg in the preparation of seed latex, and composite emulsifier is 13kg, and butadiene is 22kg, and styrene is 78kg, and initiator is 0.7kg, and reaction temperature It was 55 DEG C, and the reaction time was 11 hours; the seed latex in the preparation of carboxylated styrene-buta...

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Abstract

The invention belongs to the technical field of seed emulsion polymerization, relates to a preparation of a high polymer material, and especially relates to a small-particle-size carboxylic styrene-butadiene latex and its preparation method. Technical problems comprising unadjustable particle size, bad mechanical stability, bad chemical stability and the like of latexes in the prior art are solved in the invention. The preparation method which adopts a seed emulsion polymerization technology and adopts butadiene and styrene as monomers comprises the following steps: adding soft water, a seed latex, an electrolyte, a chelating agent and a pH buffering agent; heating; adding functional monomers, unsaturated carboxylic acid, a molecular weight adjustment agent, a composite emulsifier and an initiator; degassing when the conversion rate reaches above 98%; cooling; and synthesizing the carboxylic styrene-butadiene latex. Compared with the prior art, the preparation method of the small-particle-size carboxylic styrene-butadiene latex has the advantages of realization of the adjustment of the particle size of the latex, and simple operation; and compared with present carboxylic styrene-butadiene latexes, the carboxylic styrene-butadiene latex prepared in the invention has the advantages of narrow monodispersion, good fluidity, excellent mechanical stability and excellent chemical stability.

Description

technical field [0001] The invention belongs to the technical field of seed emulsion polymerization, and relates to the preparation of polymer materials, in particular to a small-diameter carboxylated styrene-butadiene latex and a preparation method thereof. Background technique [0002] Emulsion polymerization uses water as a solvent, under the action of an emulsifier and with the help of mechanical stirring, the monomer is dispersed into an emulsion in water, and the polymerization reaction is initiated by an initiator. In recent years, with the development of emulsion polymerization technology, the use of synthetic latex has also been expanding, especially carboxylated styrene-butadiene latex, and its uses include paper coating, carpet back coating, fabric coating, shoe material bonding, etc. With the development of the paper industry, the speed of paper coating is getting faster and faster, and the solid content of the prepared coating is getting higher and higher. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F236/10C08F220/06C08F222/02C08F220/44C08F220/56C08F2/30C08F2/26D21H19/20
Inventor 周兆丰
Owner WEIFANG LANLI NEW MATERIAL CO LTD
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