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Starch-base styrene-acrylic emulsion and preparation method thereof

A starch-based styrene-acrylic emulsion and a technology of the styrene-acrylic emulsion are applied in the field of starch-based styrene-acrylic emulsion and its preparation, and can solve the problems of high cost, poor water resistance, and more foam, and achieve less foaming, high bonding strength, Good elasticity

Inactive Publication Date: 2019-03-19
浙江莱科新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The finished product of styrene-acrylic emulsion in the prior art has many foams, poor water resistance and high cost

Method used

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  • Starch-base styrene-acrylic emulsion and preparation method thereof
  • Starch-base styrene-acrylic emulsion and preparation method thereof
  • Starch-base styrene-acrylic emulsion and preparation method thereof

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preparation example Construction

[0022] On the other hand, the embodiment of the present invention also provides a kind of preparation method of starch-based styrene-acrylic emulsion, it comprises:

[0023] S1. Mix anionic starch and its derivatives with vegetable gum and heat up and cook.

[0024] Specifically, the anionic starch and its derivatives are prepared with water to a concentration of 20-40%, and then vegetable gum is added in an amount of 0.5-1.5%, and the temperature is raised to 90-95° C. and boiled for 0.5-1 hour.

[0025] S2, then lowering the temperature, adding the monomer mixture, initiator and internal crosslinking agent dropwise, and keeping warm.

[0026] Specifically, cool down the material obtained in step S1 to 80-85°C, then dropwise add the monomer mixture, initiator and internal crosslinking agent, drop the monomer mixture, initiator and internal crosslinking agent in 1-3 hours, and keep warm 0.5-2 hours.

[0027] Wherein, the monomer mixture may be mixed and dropped with the inte...

Embodiment 1

[0035] This embodiment provides a starch-based styrene-acrylic emulsion and a preparation method thereof.

[0036] In a four-neck flask with a condenser and a stirring paddle, add 195g of water, start stirring, add 87g of carboxylated starch, add 3.5g of Tianqing gum, heat up to 93°C and cook for 1 hour, then cool down to a material temperature of 85°C. Start to drop 3.5g of 5% potassium persulfate solution and a mixture of 60g of styrene, 4g of acrylic acid, 40g of butyl acrylate, and 3g of N-hydroxyacrylamide at the same time. The latter drops in 80 minutes, and the former drops in 85 minutes. , After dripping, it was kept at this temperature for 2 hours. Lower the temperature of the material to 58°C, adjust the pH value of the material to 7.5, add 4g of aziridine, keep it warm for 1 hour, lower the temperature of the material to 42°C, filter, and discharge the material to obtain the product.

[0037] Actual solid content: 50.2%, viscosity: 385mpa.s, pH value: 7.3

Embodiment 2

[0039] This embodiment provides a starch-based styrene-acrylic emulsion and a preparation method thereof.

[0040] In a four-neck flask with a condenser and a stirring paddle, add 198g of water, start stirring, add 80g of phosphate ester starch, add 4g of gum arabic, heat up to 95°C and cook for 1 hour, cool down to a material temperature of 83°C, and start Add dropwise the mixture of ammonium persulfate solution of 3g 3% concentration and 60g styrene, 3g methacrylic acid, 44g butyl acrylate, 4g acetoacetoxy ethyl methacrylate, the latter dripped in 75 minutes, the former in 80 Minutes drop, after dripping, keep warm at this temperature for 1.5 hours. Lower the temperature of the material to 55°C, adjust the pH of the material to 7.8, add 4g of pentaerythritol glycidyl ether, keep it warm for 1 hour, lower the temperature of the material to 45°C, filter, and discharge the material to obtain the product.

[0041] Actual solid content: 49.8%, viscosity: 425mpa.s, pH value: 7.5 ...

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Abstract

The invention relates to the field of styrene-acrylic emulsions and provides a starch-base styrene-acrylic emulsion and a preparation method thereof. The starch-base styrene-acrylic emulsion containsthe following components in percentage by mass: 10%-30% of anionic starch and a derivative of the anionic starch, 0.5%-1.5% of vegetable gum, 10%-30% of a monomer mixture, 0.2%-1.0% of an initiator, 0.5%-3% of an inner cross-linking agent, 0.1%-3% of an outer cross-linking agent, and 40%-70% of water. The preparation method comprises the following steps: mixing the anionic starch and the vegetablegum, heating for decoction, cooling, dropwise adding the monomer mixture, the initiator and the inner cross-linking agent, maintaining the temperature, and adjusting the pH value to 6-8; and coolingto the temperature below 60 DEG C, adding the outer cross-linking agent for generate cross-linking reaction, cooling, and filtering. According to the preparation method, the tenacity of the starch-base styrene-acrylic emulsion is improved, little bubble is produced in the preparation process, the production process is safe and controllable, and the prepared starch-base styrene-acrylic emulsion ishigh in bonding strength, good in tenacity, elasticity and water tolerance and low in cost.

Description

technical field [0001] The invention relates to the field of styrene-acrylic emulsions, in particular to a starch-based styrene-acrylic emulsion and a preparation method thereof. Background technique [0002] Styrene-acrylic emulsion is obtained by emulsion copolymerization of styrene and acrylate monomers. The finished product of styrene-acrylic emulsion in the prior art has many foams, poor water resistance and high cost. Contents of the invention [0003] The object of the present invention is to provide a starch-based styrene-acrylic emulsion, which has high bonding strength, good toughness, good elasticity, less foam and good water resistance. [0004] Another object of the present invention is to provide a method for preparing the above-mentioned starch-based styrene-acrylic emulsion, which has a safe and controllable production process, high bonding strength, good toughness, good elasticity, less foam and good water resistance. [0005] Embodiments of the present ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/06C08F220/18C08F220/58C08F220/28C08F212/12C08F222/02C08F2/26C08L25/14C08L25/16C08L3/06C08L3/04C08L5/00C08J3/24
CPCC08F2/26C08F212/08C08F212/12C08J3/246C08J2405/00C08J2403/06C08J2403/04C08J2325/14C08J2325/16C08F222/02C08F220/1804C08F220/58C08F220/06C08F220/283
Inventor 尹传猛
Owner 浙江莱科新材料科技有限公司
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