Preparation method of acrylic emulsion for construction sealant

A technology of acrylic emulsion and sealing paste, which is applied in the direction of chemical instruments and methods, adhesive types, and other chemical processes, and can solve problems such as unsuitability, aging performance, water resistance, and alkali resistance, etc., to achieve water resistance And the effect of strong toughness, strong adhesion and excellent performance

Inactive Publication Date: 2016-03-23
GUILIN HEXIN WATERPROOF DECORATION MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since these copolymers contain styrene structural units with poor aging properties or vinyl acetate copolymers with less than ideal water resistance and alkali resistance, they are used as base materials for water resistance, aging resistance, stability and It is obviously not suitable for the preparation of building sealants with high requirements such as high adhesion

Method used

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  • Preparation method of acrylic emulsion for construction sealant

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Effect test

Embodiment 1

[0018] (1) Preparation of pre-emulsion: the composite emulsifier made of 2g sodium dodecylbenzene sulfonate and 1g nonylphenol polyoxyethylene ether is added to 40g butyl acrylate, 33g methyl methacrylate, 2g acrylic acid In the prepared mixed solution, adjust its pH to 6 with sodium hydroxide, raise the temperature to 60°C in the reactor for emulsification, and add 150g of deionized water dropwise, emulsify for 30min after the dropwise addition, cool down, and pour it into into the beaker;

[0019] (2) Preparation of seed emulsion: Weigh 2g potassium persulfate and 0.2g sodium bicarbonate to make 20mL solution, add to the pre-emulsion and mix evenly, and add 60mL of the emulsion into the reactor, stir at a medium speed, and heat up to 75°C, react for 1 hour to obtain seed emulsion;

[0020] (3) Emulsion polymerization: Add the remaining emulsion liquid dropwise into the seed emulsion within 2 hours to carry out emulsion polymerization reaction, add 0.1 g of potassium persulf...

Embodiment 2

[0022] (1) Preparation of pre-emulsion: the compound emulsifier that 2.4g sodium dodecylbenzene sulfonate and 1.2g nonylphenol polyoxyethylene ether is made into joins by 46g butyl acrylate, 38g methyl methacrylate, In the mixture made of 2.2g of acrylic acid, adjust the pH to 6.5 with sodium hydroxide, raise the temperature in the reactor to 65°C and stir for emulsification, and add 155g of deionized water dropwise, emulsify for 35min after the dropwise addition, and cool down. Pour it into a beaker;

[0023] (2) Preparation of seed emulsion: Weigh 2.3g of potassium persulfate and 0.23g of sodium bicarbonate to make 23mL solution, add it to the pre-emulsion and mix evenly, and add 60mL of the emulsion into the reactor, stir at a medium speed, and heat up to 76°C, react for 1 hour to obtain seed emulsion;

[0024] (3) Emulsion polymerization: drop the remaining emulsion into the seed emulsion within 2 hours for emulsion polymerization, add 0.1g of potassium persulfate / 10mL of...

Embodiment 3

[0026] (1) Preparation of pre-emulsion: the compound emulsifier that 2.6g sodium dodecylbenzene sulfonate and 1.3g nonylphenol polyoxyethylene ether is made into joins by 50g butyl acrylate, 41g methyl methacrylate, In the mixture made of 2.4g of acrylic acid, adjust the pH to 6.2 with sodium hydroxide, raise the temperature in the reactor to 62°C and stir for emulsification, and add 160g of deionized water dropwise, emulsify for 40min after the dropwise addition, and cool down Pour it into a beaker;

[0027] (2) Preparation of seed emulsion: Weigh 2.5g of potassium persulfate and 0.25g of sodium bicarbonate to make 25mL solution, add it to the pre-emulsion and mix evenly, and add 60mL of the emulsion into the reactor, stir at a medium speed, and heat up to 78°C, and react for 1 hour to obtain a seed emulsion;

[0028] (3) Emulsion polymerization: drop the remaining emulsion into the seed emulsion within 2 hours for emulsion polymerization, add 0.1 g of potassium persulfate / 1...

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Abstract

The invention provides a method for preparing acrylic emulsion through adopting a semi-continuous seed emulsion polymerization method and copolymerizing acrylic acid or methacrylic acid with ester compounds thereof. The acrylic emulsion has relatively high viscosity, strong bonding force, good stability and water resistance, relatively high toughness and good performances, so that the acrylic emulsion is a very ideal base material for preparing a construction sealant.

Description

technical field [0001] The invention relates to the technical field of sealing paste, in particular to a method for preparing an acrylic emulsion for building sealing paste. Background technique [0002] Acrylate emulsion is the product of emulsion polymerization of acrylate or methacrylate and other vinyl monomers. At present, domestically, there are mainly vinyl acetate-(meth)acrylate copolymer emulsions and styrene-(meth)acrylate copolymer emulsions. Since these copolymers contain styrene structural units with poor aging properties or vinyl acetate copolymers with less than ideal water resistance and alkali resistance, they are used as base materials for water resistance, aging resistance, stability and It is obviously not suitable for the preparation of building sealants with high requirements such as high adhesion. Contents of the invention [0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for preparin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F220/06C08F2/26C08F2/30C09J133/12C09K3/10
CPCC08F2/26C08F2/30C08F220/14C09J133/12C09K3/1006C09K2003/1081C08F220/1804C08F220/06
Inventor 黄志强王继发刘泓铭
Owner GUILIN HEXIN WATERPROOF DECORATION MATERIAL
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