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Preparation method of fluorine-containing polyacrylate soap-free emulsion

A technology of polyacrylate and soap-free emulsion, applied in the direction of coating, etc., can solve the problems of limitation, easy flocculation, latex particle collision, etc., achieve the effects of improving stability and storage stability, overcoming easy migration, and improving adhesion

Inactive Publication Date: 2014-07-30
山西佳宇丰化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the fluorine-containing polyacrylate emulsion prepared by traditional emulsion polymerization, the small molecule emulsifier is attached to the surface of the latex particle by physical adsorption, and it is easily desorbed by the influence of the external environment, causing the latex particle to collide, causing the emulsion to have undesirable Electrolyte resistance, easy flocculation and other shortcomings; small molecule emulsifiers will migrate to the surface of the film during the film formation process, thereby affecting the adhesion, water repellency, oil repellency, compactness, smoothness and gloss of the coating film, making it more suitable for further application restricted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: 1) First, mix 63% of butyl acrylate, 27% of methyl methacrylate and 10% of hexafluorobutyl acrylate uniformly by mass percentage to prepare mixed monomers;

[0015] 2) Next, add the deionized water of 200% of mixed monomer quality, 4% emulsifier PAA-b-PHFBA (M n It is 2066, PDI is 1.31), 0.27% initiator ammonium persulfate, 1.2% sodium bicarbonate and 1 / 4 part of mixed monomers, nitrogen reaction while stirring for 30 minutes;

[0016] 3) Then the temperature of the mixture in step 2) was raised to 78°C, and the initiator ammonium persulfate aqueous solution of 0.53% of the mass of the mixed monomer was added by a peristaltic pump within 102 minutes and the remaining 3 / 4 part of the mixed monomer was added, and the monomer was added Finally, react at 85°C for 120 minutes to complete the reaction, cool down to 45°C, and discharge to obtain a fluorine-containing polyacrylate soap-free emulsion with a solid content of 24.48%, a conversion rate of 81.17%, and a l...

Embodiment 2

[0017] Example 2: 1) First, mix 60% of butyl acrylate, 30% of methyl methacrylate and 10% of hexafluorobutyl acrylate uniformly by mass percentage to prepare mixed monomers;

[0018] 2) Next, add the deionized water of 200% of mixed monomer quality, 3.5% emulsifier PAA-b-PHFBA (M n It is 2066, PDI is 1.31), 0.4% initiator ammonium persulfate, 1.26% sodium bicarbonate and 1 / 4 part of mixed monomer, nitrogen reaction while stirring for 30 minutes;

[0019] 3) Then heat up the mixture of step 2) to 80°C, and simultaneously add 0.8% initiator ammonium persulfate aqueous solution and the remaining 3 / 4 part of the mixed monomer with a peristaltic pump within 95 minutes, and the monomer is added Finally, react at 85°C for 120 minutes to complete the reaction, cool down to 45°C, and discharge to obtain a fluorine-containing polyacrylate soap-free emulsion with a solid content of 28.70%, a conversion rate of 95.79%, and a latex particle size of 77.62nm.

Embodiment 3

[0020] Example 3: 1) First, mix 48% butyl acrylate, 50% methyl methacrylate and 2% hexafluorobutyl acrylate uniformly by mass percentage to prepare mixed monomers;

[0021] 2) Next, add the deionized water of 200% of mixed monomer quality, 2% emulsifier PAA-b-PHFBA (M n 2805, PDI is 1.18), 0.5% initiator potassium persulfate, 1.31% sodium bicarbonate and 1 / 4 part of mixed monomer, nitrogen reaction while stirring for 30 minutes;

[0022] 3) Then the mixture in step 2) is warmed up to 82°C, and the initiator potassium persulfate aqueous solution with a mass of 0.84% ​​of the mixed monomer is added with a peristaltic pump within 87 minutes and the remaining 3 / 4 part of the mixed monomer is added, and the monomer is added Finally, react at 87°C for 100 minutes to complete the reaction, cool down to 45°C, and discharge to obtain a fluorine-containing polyacrylate soap-free emulsion with a solid content of 28.62%, a conversion rate of 95.50%, and a latex particle size of 138.3nm.

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Abstract

The invention relates to a preparation method of a fluorine-containing polyacrylate soap-free emulsion. According to the invention, the fluorine-containing polyacrylate soap-free emulsion is prepared by adopting an amphiphilic segmented copolymer polyacrylic acid-b-polyhexafluorobutyl acrylate (PAA-b-PHFBA) to substitute a routine emulsifier, and carrying out soap-free emulsion copolymerization on acrylate monomers, and can be applied to the leather field, the textile field, the coating field, the papermaking field, the adhesive field and the like. The compatibility of the hydrophobic segment of the used PAA-b-PHFBA and above prepolymerization monomers is good, so a problem of bad compatibility of fluorine-containing monomers is solved, thereby the stability of the emulsion polymerization process is substantially improved. Additionally, the PAA-b-PHFBA is anchored to emulsion particles in the emulsion polymerization, and the hydrophilic segment stretches into a water phase to stabilize the emulsion particles through an electrostatic effect and a steric hindrance effect, so the storage stability and the freeze-thaw resistance stability of the emulsion are improved, disadvantages of bad adhesion, bad water resistance and bad solvent resistance of films of common emulsions are overcome, and the mechanical properties, the adhesion and the abrasive resistance of the film of the emulsion are improved.

Description

technical field [0001] The invention relates to a preparation technology of a soap-free emulsion, in particular to a preparation method of a fluorine-containing polyacrylate soap-free emulsion. Background technique [0002] Fluorine-containing polyacrylate emulsion has good film-forming properties, excellent surface and optical properties, good chemical resistance and heat resistance, especially can endow polymer materials with low surface energy, and is widely used in coatings, textiles, leather, Papermaking, adhesives and photosensitive materials and other fields. In the fluorine-containing polyacrylate emulsion prepared by traditional emulsion polymerization, the small molecule emulsifier is attached to the surface of the latex particle by physical adsorption, and it is easily desorbed by the influence of the external environment, causing the latex particle to collide, causing the emulsion to have undesirable Electrolyte resistance, easy flocculation and other shortcomin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/18C08F220/14C08F220/22C08F2/24C09D133/08C09D133/12
Inventor 周建华张琳
Owner 山西佳宇丰化工科技有限公司
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