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Silicon-fluorin acrylic acid ternary polymerization latex and method for preparation thereof

A technology of silicon-fluorine-acrylic acid ternary copolymer latex and terpolymer latex, which is applied in the field of chemical building materials, can solve the problems of not being able to meet the performance of building exterior wall coatings, not being able to promote the use of large areas, and limiting the application range of fluorine coatings, so as to improve the anti-corrosion Alkaline performance, easy control, and great operating flexibility

Inactive Publication Date: 2004-12-29
曹晓利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicone-acrylic latex coatings also have some limitations. For example, although their weather resistance, durability, and stain resistance are better than pure acrylic paints and styrene-acrylic coatings, the improvement is not obvious, especially for high-rise buildings and bridges that are not easy to maintain. Compared with repainted buildings, if the air quality is poor or in sandy weather, silicone acrylic latex coatings cannot meet the increasingly higher requirements for the performance of building exterior wall coatings.
Although fluorocarbon coatings have excellent performance and good weather resistance and stain resistance, fluorocarbon resins have low polarity, small intermolecular forces, and low mechanical strength. When used as a coating alone, its interaction with the substrate is very strong. Small, poor adhesion, low coating strength
In addition, fluororesin is expensive, construction requirements are high, and there are few varieties of water-based fluororesin
These have greatly limited the scope of application of fluorine coatings, making it impossible to promote the use of large areas.
[0003] Silicon fluoropropylene ternary copolymer latex, which is copolymerized with double bond-containing polymer (PVDF-HFP-TFE), organosilicon monomer, acrylate monomer and other auxiliary monomers and additives in a certain way, has Many excellent properties, such as high weather resistance, high stain resistance, self-cleaning property and outstanding rain erosion resistance, and good film-forming performance at room temperature, the prepared coating has good construction performance, easy to operate during use, and adheres to the base layer Strong focus, it is an ideal water-based exterior wall paint latex, and there is no report in this regard in China at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation:

[0034] 1. Heat up the pre-polymerized emulsion of organic fluorine to 50°C, stir, and use high-shear emulsification under the condition of oxygen protection, and then add 10% of the total amount of initiator to obtain activated organic fluorine seed latex;

[0035] 2. In the organic fluorine seed latex, gradually add acrylate monomer, organosilicon monomer and other modified monomers, and gradually add the mixed solution of emulsifier and initiator dissolved in deionized water (drop within 3 hours) Finish). The copolymerization reaction was carried out at 50°C while keeping the temperature, and the reaction time was 5 hours in total;

[0036] 3. Add ethylene glycol, adjust the pH value to 7-8 with sodium carbonate, and continue to keep warm for 0.5-1.0 hours to obtain ternary copolymerized silicon fluoroacrylic acid copolymer latex, the latex solid content is 45%.

[0037] performance

Embodiment 2

[0040] Preparation:

[0041] 1. Heat up the pre-polymerized emulsion of organic fluorine to 50°C, stir, and use high-shear emulsification under the protection of oxygen, then add 10% of the total amount of initiator to obtain activated organic fluorine seed latex;

[0042] 2. In the organic fluorine seed latex, gradually add acrylate monomers, organosilicon monomers and other modified monomers, and gradually add the mixed solution of emulsifier and initiator dissolved in deionized water at the same time (after 2 hours dropwise ). The copolymerization reaction was carried out at 50° C. for a total reaction time of 4 hours.

[0043] 3. Add ethylene glycol, adjust the pH value to 8-9 with sodium carbonate, and continue to keep warm for 0.5-1.0 hours to obtain ternary copolymerized silicone fluoroacrylic acid copolymer latex. The latex solids content is 48%.

[0044] performance

Embodiment 3

[0047] Preparation:

[0048] 1. Heat up the pre-polymerized emulsion of organic fluorine to 50°C, stir, and use high-shear emulsification under the condition of oxygen protection, then add 10% of the total amount of initiator to obtain activated organic fluorine seed latex;

[0049] 2. In the organic fluorine seed latex, gradually add acrylate monomers, organosilicon monomers and other modified monomers, and gradually add the mixed solution of emulsifier and initiator dissolved in deionized water at the same time (drop after 3 hours) ). The copolymerization reaction was carried out at 50°C while keeping the temperature, and the reaction time was 5 hours in total;

[0050] 3. Add ethylene glycol, adjust the pH value to 7-8 with sodium carbonate, and continue to keep warm for 0.5-1.0 hours to obtain ternary copolymerized silicone fluoroacrylic acid copolymer latex. The latex solids content is 45%.

[0051] performance

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Abstract

The present invention is one kind of ternary silicofluoroacrylic acid copolymer emulsion and its preparation process. Organic fluororic pre-polymer is emulsified and activated to prepare seed emulsion, and organic silicon compound and acrylic ester monomer are then added to perform copolymerization to obtain the ternary silicofluoroacrylic acid copolymer emulsion. The present invention has excellent weather resistance, durability, water resistance and antifouling property, and may be used as paint directly or as intermediate product for compounding other paint product.

Description

technical field [0001] The invention belongs to the technical field of chemical building materials, and relates to a ternary copolymer latex for preparing coatings, in particular to a ternary copolymer latex of organic silicon, organic fluorine and acrylate. The invention also relates to a method for preparing the latex. Background technique [0002] Acrylate polymer latex is often used as the main film-forming material for water-emulsion building exterior walls. The coatings prepared with it have many advantages, such as light resistance, scrub resistance, acid and alkali resistance, etc., but the water resistance and oil resistance of acrylate polymer latex coatings are poor, and the coating film is not resistant to dirt and has high temperature change. Sticky, low temperature and brittle disadvantages, especially its aging resistance is difficult to meet the requirements of exterior wall coatings, and the general service life is about five years. Although people improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/22C08F220/10
Inventor 曹晓利
Owner 曹晓利
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