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Aqueous dispersion of high solid content fluorine-containing hydroxy polyacrylate and its preparation method and application

A technology of fluorine-containing hydroxyl polyacrylate and high solid content, applied in polyurea/polyurethane coatings, biocide-containing paints, antifouling/underwater coatings, etc., can solve the problem of reducing the hardness of the coating film and reducing the recoating of the coating film Solvent resistance and other issues, to achieve the effect of excellent solvent resistance, low VOC, good adhesion

Active Publication Date: 2020-09-25
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating film prepared by this technology has good aging resistance, but its fluorine-containing acrylic acid monomer is as high as 10-35%, which seriously reduces the hardness of the coating film, and at the same time reduces the recoatability of the coating film

Method used

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  • Aqueous dispersion of high solid content fluorine-containing hydroxy polyacrylate and its preparation method and application
  • Aqueous dispersion of high solid content fluorine-containing hydroxy polyacrylate and its preparation method and application
  • Aqueous dispersion of high solid content fluorine-containing hydroxy polyacrylate and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Preparation of high solid content fluorine-containing hydroxyl polyacrylate aqueous dispersion

[0041] In parts by mass, the raw material components and consumption are as follows in Table 1

[0042] Table 1

[0043]

[0044] Preparation: Under nitrogen protection, mix vinyl fluoride monomer, vinyl sulfonate monomer, acrylic monomer, initiator and chain transfer agent to prepare a mixed solution, add 10% of the mixed solution to the reactor, Stir and heat up to 70°C for 30 minutes, add the remaining mixture into the reactor within 4 hours, and keep it warm for 2 hours to obtain a fluorine-containing hydroxyl polyacrylate prepolymer; then lower the temperature to below 50°C, add a neutralizing agent for neutralization, and add water High-speed dispersion was carried out at 1000 rpm at 30°C to prepare an aqueous dispersion.

[0045] Performance of high solid content fluorine-containing hydroxyl polyacrylate aqueous dispersion: solid content is 45%, viscosity (25°...

Embodiment 2

[0057] (1) Preparation of high solid content fluorine-containing hydroxyl polyacrylate aqueous dispersion

[0058] In terms of parts by mass, the raw material components and consumption are as shown in Table 3

[0059] table 3

[0060]

[0061]

[0062] Preparation of vinyl fluoride monomer-modified polyacrylate: under nitrogen protection, mix vinyl fluoride monomer, vinyl sulfonate monomer, acrylic monomer, initiator and chain transfer agent to prepare a mixed solution, Add 10% mixed solution into the reactor, stir and raise the temperature to 75° C. for 30 minutes, add the remaining mixture into the reactor within 4 hours, and keep it warm for 1.5 hours to obtain a fluorohydroxypolyacrylate prepolymer. Then lower the temperature to below 50°C, add a neutralizing agent for neutralization, add water at 30°C and perform high-speed dispersion at 1500 rpm to obtain an aqueous dispersion.

[0063]Vinyl fluoride monomer-modified polyacrylate aqueous dispersion properties: s...

Embodiment 3

[0071] (1) Preparation of high solid content fluorine-containing hydroxyl polyacrylate aqueous dispersion

[0072] In parts by mass, the raw material components and consumption are as shown in Table 5

[0073] table 5

[0074]

[0075] Preparation of vinyl fluoride monomer modified polyacrylate: under nitrogen protection, vinyl fluoride monomer, vinyl silicon monomer, vinyl sulfonate monomer, acrylic monomer, initiator and chain transfer agent Mix to prepare a mixed solution, add 15% of the mixed solution to the reactor, stir and heat up to 75°C for 35 minutes, add the remaining mixture to the reactor within 5 hours, and keep it warm for 1.5 hours to obtain vinyl fluoride monomer-modified Polyacrylate prepolymer. Then lower the temperature to below 50°C, add a neutralizing agent for neutralization, add water at 30°C and perform high-speed dispersion at 2500 rpm to obtain an aqueous dispersion.

[0076] Vinyl fluoride monomer-modified polyacrylate aqueous dispersion prope...

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Abstract

Disclosed are a fluorine-containing hydroxyl polyacrylate aqueous dispersion with a high solid content, a preparation method therefor and the use thereof. The preparation method involves: under nitrogen protection, mixing a fluorine-containing vinyl monomer, a vinyl sulfonate monomer, an acrylic monomer, an initiator and a chain transfer agent to prepare a mixed solution, firstly adding 5-15% of the mixed solution to a reactor, stirring and heating same to 70-85ºC for reaction for 30-45 minutes, adding the remaining mixture to the reactor over 4-5.5 hours, and maintaining the temperature for 1-2 hours to obtain a fluorine-containing hydroxyl polyacrylate prepolymer; and then cooling same to 50ºC or less, adding a neutralizer for neutralization, and adding water for emulsification to obtain the product. The prepared fluorine-containing hydroxyl polyacrylate aqueous dispersion has the advantages of a high solid content, a low viscosity, a good hydrophilicity and good compatibility with a curing agent. A prepared aqueous two-component polyurethane coating film has the characteristics of a strong hydrophobicity, a high hardness, a good adhesion, a good flexibility, a good stain resistance and an excellent solvent resistance.

Description

technical field [0001] The invention relates to an aqueous dispersion of hydroxyl polyacrylate, in particular to an aqueous dispersion of high solid content, low viscosity, good hydrophilicity, and good compatibility with curing agents. The preparation method and application thereof belong to the field of fine chemical synthesis. Background technique [0002] Two-component waterborne polyurethane coatings (2K-WPU) have high performance and low VOC content, and are one of the most concerned varieties in the field of coatings in recent years. 2K-WPU contains polyisocyanate component and hydroxyl component. Among them, water-based hydroxyacrylic resin is a common hydroxyl component, which has the characteristics of good gloss, strong adhesion, and good film-forming properties, but it also has the disadvantages of hot stickiness, cold brittleness, and poor water resistance to the coating film. Waterborne hydroxyacrylic resin can be two kinds of hydroxyacrylic emulsion and hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/14C08F220/18C08F220/06C08F220/58C08F220/24C08F228/02C08F218/00C08F220/20C08F212/12C08F283/06C09D175/04C09D5/16
CPCC08F220/14C08F220/18C08F283/065C09D5/16C09D175/04C08F220/06C08F220/20C08F220/24
Inventor 瞿金清刘栋朱延安
Owner SOUTH CHINA UNIV OF TECH
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