Fluorosurfactants free of PFOA and its salts

Abstract

The invention discloses a fluorine-containing surfactant free of perfluorooctanoic acid and its salts. The fluorine-containing surfactant is composed of perfluoroolefin, oxygen and a third monomer at a temperature of 0-20°C and a pressure of 0.1-0.5Mpa After continuous feeding, it is prepared by photooxidation, hydrolysis, and salt formation. The third monomer is an alkene or alkyne containing at least one non-fluorine atom. The fluorine-containing surfactant involved in the present invention is based on The C-O-C ether bond structure is a fluoropolymer with the main structure. It can be seen from the indicators that this fluorosurfactant does not contain perfluorooctanoic acid and its salts with an 8-carbon straight chain structure, and is easily decomposed in nature. And it has been proven to be harmless to the human body, the peroxide value satisfies 0.001-1%, the surface tension satisfies 10-30mN / m, has the amphiphilic structure of surfactant, is suitable for continuous industrial production, and has high product yield and high product yield. The advantages of small fluctuations in quality.

Description

technical field [0001] The invention relates to a fluorine-containing surfactant free of perfluorooctanoic acid and its salt, specifically relates to a fluorine-containing polymer used as a surfactant, and belongs to the field of organic compound synthesis. Background technique [0002] Fluoropolymer is a special basic material with high added value, and its development is closely related to the use requirements of cutting-edge scientific fields such as military, aviation, aerospace and nuclear industries. However, based on the existing problems in the production of fluoropolymers in China, we know that the quality factor of fluoropolymers produced by domestic enterprises is relatively low at present, which cannot meet the market demand. The production is mainly based on low-end polymer fluorine-containing products. Such as: PTFE emulsion, PTFE powder, etc., especially high value-added products such as perfluoroether rubber and fluoroether oil still need to be imported, so t...

AI Technical Summary

Problems solved by technology

However, in the actual application process, we know that the chemical characteristics of the product cannot be characterized by any molecular chain or group in its structural formula, and any change in any molecular chain, group or substituent in the structural formula may cause The properties of products vary greatly, especially in large-scale industrial production, even if the small features or defects of products are not shown in the laboratory preparation process, they are very likely to be magnified in large-scale industrial production. Therefore, in modern In industrial production, qualitative testing of products is not only the only standard for testing product qualification, but also an important indicator for testing product preparation process. Only when industrial products meet the technical requirements can industrial production be guaranteed not to be eliminated by the market

Images