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Heat-sensitive copolymer latex, preparation method and application thereof

A copolymer latex, heat-sensitive technology, applied in the direction of textiles and papermaking, coating, paper coating, etc., can solve the problems of unstable polymerization reaction, poor hand feeling of impregnated products, large amount of emulsifier, etc., and achieve resilience and dimensional stability Excellent performance, excellent storage stability, moderate glass transition temperature

Active Publication Date: 2012-06-06
NANTONG TENGLONG CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the above-mentioned patents, U.S. Patent US 5629047 uses a low-temperature (5°C) emulsion polymerization route, the reaction time is long, the conversion rate is not high, unreacted monomer needs to be recovered, and the proportion of conjugated diene monomer in the polymerization formula is low, and the copolymer The glass transition temperature is high, and the hand feeling of the impregnated product is not good; the German patent Ger1243394 uses an anionic and nonionic composite emulsification system, the amount of emulsifier is large, the latex thermal performance is poor, and the polymerization temperature is low, and the conversion rate is low (for 90%), needs to reclaim the operations such as unreacted monomer, and production efficiency is not high; Chinese patent publication number CN1640899 directly adds heat-sensitive nonionic polymer and zinc oxide cross-linking agent when synthesizing latex, makes polymerization unstable, And it is easy to appear condensation in latex storage
[0005] Based on the above technical situation, the present invention develops an improved heat-sensitive copolymer latex to overcome the long reaction time of the above-mentioned patents, unstable polymerization reaction, poor hand feeling of dipped products, poor heat-sensitive performance of latex, and easy to occur during latex storage. Condensate Defects

Method used

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  • Heat-sensitive copolymer latex, preparation method and application thereof
  • Heat-sensitive copolymer latex, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In the reactor, add 135wt% of water, 2.75wt% of sodium lauryl sulfate, 3.0wt% of methacrylic acid, 15wt% of styrene, 0.4wt% of tertiary-dodecanethiol, 0.4wt% of EDTA, and Block 0.32wt%, butadiene 17wt%, stir and heat up to 50°C, add initiator potassium persulfate 0.40wt%, carry out polymerization for about 1.5 hours, then continuously add water 15% within 2.75 to 3 hours, dodecane A mixture of 0.25wt% sodium disulfate, 30wt% styrene and 35wt% butadiene is polymerized for 6.5-7.5 hours, and the reaction is terminated.

[0048] The emulsion was neutralized to pH 7.0 with ammonia water, and the final latex solid content was 39.7%.

[0049] According to the heat sensitivity test, the heat sensitive temperature of the heat sensitive complex is 48°C, and the heat sensitive coagulum is tight and has high strength. The properties of impregnated artificial leather base cloth are shown in Table 2.

[0050] The impregnated cardboard has moderate hand feeling, high strength, and ...

Embodiment 2

[0052] In the reactor, add water 135wt%, sodium lauryl sulfate 3.5wt%, methacrylic acid 3.5wt%, acrylonitrile 15wt%, tert-dodecyl mercaptan 0.3wt%, EDTA 0.2wt%, butanedi Alkene 15wt%, stir and heat up to 50°C, add initiator potassium persulfate 0.60wt%, carry out polymerization for about 1.5 hours, then add water 15% continuously within 2.75 to 3 hours, sodium lauryl sulfate 0.50wt%, The mixture of 31 wt% acrylonitrile and 35.5 wt% butadiene was polymerized for 6.5-7.5 hours, and the reaction was terminated.

[0053] The emulsion was neutralized to pH 7.0 with ammonia water, and the final latex solid content was 39.4%.

[0054] According to the heat sensitivity test, the heat sensitive temperature of the heat sensitive complex is 45°C, and the heat sensitive coagulum is tight and has high strength. The impregnated base fabric has a moderate hand feel. The properties of impregnated artificial leather base cloth are shown in Table 2. The properties of impregnated paperboard a...

Embodiment 3

[0056] In the reactor, add water 135wt%, sodium lauryl sulfate 3.25wt%, methacrylic acid 2.0wt%, acrylic acid 1.0wt%, styrene 15wt%, tert-dodecyl mercaptan 0.32wt%, chlorination 0.02wt% potassium, 0.30wt% diaobaite, 0.05wt% EDTA, 15wt% butadiene, stir and heat up to 50°C, add initiator potassium persulfate 0.30wt%, carry out polymerization for about 1.5 hours, then 2. The mixture of 15% water, 0.25wt% sodium lauryl sulfate, 32wt% styrene and 35wt% butadiene was added continuously within 75 hours, and the reaction was terminated after polymerization for 6.5-7.5 hours.

[0057] The emulsion was neutralized to pH 7.0 with ammonia water, and the final latex solid content was 39.7%.

[0058] According to the heat sensitivity test, the heat sensitive temperature of the heat sensitive complex is 47°C, the heat sensitive coagulated matter is compact and has high strength; the impregnated base fabric has moderate hand feeling. The properties of the impregnated artificial leather base ...

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Abstract

The invention relates to heat-sensitive copolymer latex, a preparation method and an application thereof. The polymeric monomer is in mass percentage as follows: 40 percent to 75 percent of aliphatic conjugate diolefin monomer of C4 to C5, 20 percent to 50 percent of vinyl unsaturated monomer and 1.5 percent to 10 percent of unsaturated carboxylic acid or unsaturated amide monomer or mixture thereof. The preparation method comprises a prereaction stage, a continuous polymerzation stage and a post treatment stage as well as the application in the field of non-woven dipped articles or paperboard dipped articles. The invention has the advantages that: two-stage polymeric technique which has simple technique, stable reaction process, short reaction time and high polymerization conversion rateis adopted; the polymerization formula does not adopt a non-ionic emulsifying agent, and improves the heat-sensitive property of products, the heat-sensitive freezing point of the latex is lower; theglass transition temperature of the glass heat-sensitive copolymer is moderate, and the dipped product has good hand feeling and is compact, and has excellent resilience, size stability and higher strength; and the heat-sensitive complex of the latex has excellent storing stability.

Description

【Technical field】 [0001] The invention relates to the technical field of carboxyl copolymer latex, in particular to a thermosensitive copolymer latex and its preparation method and application. 【Background technique】 [0002] Impregnated non-woven fabrics and fiber products (cardboard) made of latex or latex complexes are the main raw materials for imitation leather, leather goods, and leather shoes, and are widely used as linings for shoes and hats. Industrial gloves, inner linings of suitcases and bags, artificial leather base fabrics, midsoles and toe caps for shoes, etc. Among them, the role of the adhesive is to improve the shape and dimensional stability of the product, improve the strength, stiffness and increase some other characteristics of the product. The performance of the adhesive largely determines the intrinsic quality of the final product, among which the heat sensitivity of the latex is the most important factor affecting the performance of the product. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/10C08F236/12C08F2/26D06M15/693D21H19/22
Inventor 米普科许胜刘敏姚烨范玲婷卫鹏刘伟
Owner NANTONG TENGLONG CHEM TECH CO LTD