Preparation of nano silicone-acrylate core shell type composite latex for latex paints

A technology for latex coatings and composite emulsions, applied in coatings and other directions, can solve the problems of difficult cost and performance unification, poor emulsion stability, complex preparation process, etc., to ensure yield, stable polymerization process, and ensure compatibility. Effect

Inactive Publication Date: 2010-12-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the above-mentioned shortcomings, this type of preparation method also has poor emulsion stability and is prone to produce two types of latex particles, polyacry

Method used

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  • Preparation of nano silicone-acrylate core shell type composite latex for latex paints
  • Preparation of nano silicone-acrylate core shell type composite latex for latex paints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] I. Monomer pre-emulsification

[0040]The three-necked flask is heated to 40°C in a water bath, and the emulsifier and the core monomer of the core layer monomer (accounting for 40wt% of the total monomer) or shell layer monomer consumption (accounting for 60wt% of the total monomer) of 0.6wt% are added or Deionized water with an amount of 35wt% shell monomer, after emulsification and dissolving uniformly, add the active monomer dropwise at a speed of 1.5g / min, after the dropwise addition, stir at a high speed of 400rpm for 30min, then stir at a low speed for 5min. Stop, the operation is completed, and the stable pre-emulsion of the core layer or the shell layer is obtained.

[0041] II. Seed emulsion polymerization

[0042] Heat the three-necked flask in a water bath to 50°C, add all the remaining amount of emulsifier and deionized water, after the emulsification and dissolution are uniform, add 30wt% of the core layer pre-emulsion, stir for 20min, add 30wt% of the to...

Embodiment 2

[0048] I. Monomer pre-emulsification

[0049] The three-necked flask water bath is heated to 42 ℃, adds the emulsifying agent of 0.7wt% emulsifier and core layer monomer or the shell layer monomer consumption (accounting for 57wt% of total monomer) of core layer monomer (accounting for total monomer 43wt%) or Deionized water with an amount of 38wt% shell monomer, after emulsification and dissolving uniformly, add the active monomer dropwise at a constant speed of 1.5g / min. Stop, the operation is completed, and the stable pre-emulsion of the core layer or the shell layer is obtained.

[0050] II. Seed emulsion polymerization

[0051] Heat the three-necked flask in a water bath to 52°C, add all the remaining amount of emulsifier and deionized water, after the emulsification and dissolution are uniform, add 33wt% of the core layer pre-emulsion, stir for 20min, add 30wt% of the total amount of the initiator to initiate After stirring for 20 minutes, adjust the temperature to 77°...

Embodiment 3

[0057] I. Monomer pre-emulsification

[0058] The three-necked flask water bath is heated to 44 ℃, adds the emulsifying agent of 0.8wt% emulsifier and core layer monomer (accounting for 46wt% of total monomer) or shell layer monomer consumption (accounting for total monomer 54wt%) or Shell monomer dosage 41wt% deionized water, after emulsification and dissolving evenly, add active monomer dropwise at a constant speed of 1.5g / min, after dropwise addition, stir at high speed of 460rpm for 30min, then stir at low speed for 5min. Stop, the operation is completed, and the stable pre-emulsion of the core layer or the shell layer is obtained.

[0059] II. Seed emulsion polymerization

[0060] Heat the three-necked flask in a water bath to 54°C, add all the remaining emulsifier and deionized water, after the emulsification and dissolution are uniform, add 36wt% of the core layer pre-emulsion, stir for 20min, then add 30wt% of the initiator aqueous solution After stirring for 20 minu...

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Abstract

The invention relates to a preparation method of nano silicone-acrylate core shell type composite latex for latex paints. The preparation method solves the problem that latex paints prepared from the common latex is insufficient to meet the demands of people at the performance aspects of water resistance, weather resistance, pollution resistance and the like, and simultaneously reduces the restraint degrees of a region domain and a time and season domain for latex construction. In the preparation method, active organic silicon and acrylate monomers are mainly used as raw materials, and then the nano silicone-acrylate core shell type composite latex using polyacrylate as a core and using silicone-acrylate composite resin as a shell is synthesized by adopting a monomer pre-emulsifying process and a seed semi-continuous latex polymerization method, so that the preparation method has the advantages of stable polymerization process and convenient large-scale production. When used for preparing the latex paints of outer walls, the synthesized latex can greatly improve all performance of the latex paints, also solve the conflicts between the lowest film-forming temperature and film hardness and simultaneously realize the unification of the cost and the performance.

Description

technical field [0001] The invention relates to the preparation of a water-based paint, in particular to a preparation method of a nanoscale core-shell silicon-acrylic composite emulsion that can be used for exterior wall latex paints. Background technique [0002] With the increasingly tight supply of energy and people's increasing emphasis on environmental protection and safety, architectural latex coatings have developed rapidly in recent years. Today, with the development of large-scale and large-scale buildings, people have higher and higher requirements for architectural coatings, especially in terms of weather resistance, stain resistance and water resistance of architectural coatings. At the same time, in order to achieve high water resistance and high stain resistance in architectural coatings, the main film-forming substance-polyacrylate is mostly developed in the direction of high hardness, which will inevitably affect the minimum film-forming temperature of the c...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/18C08F220/06C08F212/08C08F230/08C08F220/28C08F2/30C09D133/12C09D133/08C09D133/10C09D133/02C09D125/14
Inventor 马建中王华金鲍艳吕斌
Owner SHAANXI UNIV OF SCI & TECH
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