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Preparation method and application of water-based fluoropolymer emulsion

A polymer emulsion, water-based technology, applied in the direction of coating, etc., can solve the problems of high raw material price, slow polymerization speed, high polymerization temperature, etc., and achieve good chemical and mechanical stability, good corrosion resistance, and simple process Effect

Inactive Publication Date: 2007-03-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has been found in use that the emulsion polymerization of the aqueous fluoropolymer emulsion carried out by the above-mentioned emulsifier and initiator has disadvantages such as high raw material price, slow polymerization speed, high polymerization temperature and poor chemical stability of the product, which restricts it to a certain extent. Popularization and Application of Waterborne Fluoropolymer Emulsion

Method used

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  • Preparation method and application of water-based fluoropolymer emulsion
  • Preparation method and application of water-based fluoropolymer emulsion
  • Preparation method and application of water-based fluoropolymer emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add 330g (0.66mol) nonylphenol polyoxyethylene ether (OP-10), 3.7g p-toluenesulfonic acid and 1.8g hydroquinone into a three-necked flask, stir and heat up to 60°C, add 43.2 g (0.6mol) of acrylic acid, continue to heat up to 120°C for reaction, after refluxing for 3-4 hours, raise the temperature to about 140°C and keep for 1h. Then the temperature was lowered to 120° C., and most of the unreacted acid and by-product water were removed by distillation under reduced pressure. Add 200g of 5% NaOH solution to neutralize p-toluenesulfonic acid, hydroquinone and unreacted acrylic acid remaining in the system, then wash with deionized water for 3 to 5 times, and stand at 80°C for 1 to 3 hours. Layer the system. Remove the moisture in the upper layer, and dehydrate it with anhydrous sodium sulfate for 2-3 hours to obtain the macromonomer polyoxyethylene acrylate.

Embodiment 2

[0058] (1) Add vinyl isobutyl ether, hydroxybutyl vinyl ether, undecylenic acid and nonylphenol polyoxyethylene acrylate into the flask according to the formula in Table 1, Example 2, then add 70g of deionized water, and perfluorooctanoic acid Ammonium and nonylphenol polyoxyethylene ether (OP-7), high-speed stirring pre-emulsification for 1 hour, to obtain a pre-emulsion, set aside;

[0059] (2) Dissolve 1g of sodium bicarbonate in 5g of water for subsequent use; Dissolve 1g of ammonium persulfate in 5g of water for subsequent use; Dissolve 0.5g of sodium bisulfite in 5g of water to obtain ammonium persulfate solution and sodium bisulfite respectively solution and sodium bicarbonate solution for later use.

Embodiment 3

[0062] By the formula of example 3 in table 1, first two steps adopt the same method of embodiment 2 to prepare pre-emulsion and ammonium persulfate solution, sodium bisulfite solution and sodium bicarbonate solution. Step 3 proceeds as follows:

[0063] Add sodium bicarbonate solution and sodium bisulfite solution to a 1L high-pressure reactor equipped with a stirring and constant temperature device, degas and fill with N 2 After airing and degassing were repeated three times, the pre-emulsion was added to the reactor, and ammonium persulfate aqueous solution and 25g deionized water were added, and stirring was started; Chlorotrifluoroethylene, the polymerization reaction starts and the exothermic temperature of the reaction rises to 22-25°C. After 24 hours of constant temperature reaction, the reaction ends; after the unreacted gas is extracted, the material is discharged to obtain a water-based fluorine-containing resin.

[0064] The properties of the resulting emulsion ar...

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Abstract

The present invention relates to preparation process of water thinned fluoric polymer emulsion for paint. The preparation process is one emulsion copolymerization process with trifluorochloro ethylene, alkyl vinyl ether or vinyl acetate, hydroxyl butyl vinyl ether, undecylenic acid and polyoxyethylene acrylate as monomers, non-ionic emulsifier NP and anionic ammonium perfluoro octoate as composite emulsifier, and composition of ammonium persulfate or potassium persulfate and sodium bisulfite as redox initiation system. The polymerization may be completed in room temperature and is simple, and the product has excellent chemical stability, mechanical stability and mechanical performance. The emulsion has relatively high fluorine content, so that the prepared paint has excellent corrosion resistance, weather resistance and antifouling performance.

Description

technical field [0001] The invention relates to a fluorine-containing polymer emulsion, a preparation method thereof, and the application of the emulsion in paint base materials. Background technique [0002] Water-based fluorine-containing polymer emulsion for coatings is a kind of special polymer material that has developed extremely rapidly in recent years, and is mainly used as a coating base material. It is characterized by excellent corrosion resistance, weather resistance, stain resistance, and excellent comprehensive mechanical properties. It can be used as anti-corrosion coating, architectural decoration coating, etc. [0003] The preparation process of water-based fluoropolymer emulsion for coatings can be divided into three categories: shear emulsification, post-emulsification and emulsion polymerization. [0004] The shear emulsification method is to disperse the fluorine-containing resin powder, emulsifier, thickener and water prepared by other methods at high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/24C08F2/22C09D127/12
Inventor 王国建倪永刘琳
Owner TONGJI UNIV
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