Fluoro olefin copolymerization fluororesin with fluoric lateral group or fluoric branched chain

Abstract

The invention discloses a fluoro olefin copolymerization fluororesin with a fluoric lateral group or a fluoric branched chain, the resin is hexabasic copolymer which is formed by polymerizing fluoro olefin (trifluorochlor oethylene, tetrafluoroethylene), vinyl ether with a branched chain or a fluoric branched chain (lateral group) structure, alkyl vinyl ester, alkyl vinyl ether, hydroxyalkyl vinyl ether and olefine acid, the appearance of the fluoro olefin copolymerization fluororesin is colourless and faint yellow transparent liquid, the hydroxyl value (mgKOH / g) is 40-60, the acid value (mgKOH / g) is 6.5-13, dry resin fluorine content (%) is 35-45 percent, and the viscosity coefficient ((coating-4)25 DEG Cs) is 60-80. The fluoro olefin copolymerization fluororesin improves the solvent resistance of the fluorine coating, solves the technical problems of high-performance fluorine coating with good fluorine content and good dissolubility and constructability can not be synthesized originally and has the advantages of high fluorine content and low crystallinity.

Description

technical field [0001] The present invention relates to a fluoroolefin copolymerized fluororesin, in particular to a method of using ether polymer monomers with branched or fluorine-containing branched (side group) structures as main raw materials to carry out fluorine olefin and non-fluorine polymer monomers. Fluoroolefin copolymerized fluororesin prepared by multiple copolymerization reaction. Background technique [0002] Fluorine coatings (also known as fluorocarbon coatings) are emerging high-performance coatings with a durability of more than 20 years and outstanding stain resistance. Known as the "king of coatings", they are ideal exterior wall coatings . Its core substance is an organic fluoropolymer resin, which requires that the resin should first have sufficient fluorine content to ensure that the coating has good weather resistance and chemical resistance; at the same time, the resin has better molecular flexibility and low crystallinity, so that the resin has e...

AI Technical Summary

Problems solved by technology

[0005] The fluorine content of the fluorine coating resin synthesized with chlorotrifluoroethylene is low, and it is difficult to increase it. The fluorine resin with low fluorine content cannot take advantage of the high performance of the fluorine coating

Moreover, the resin pigment synthesized in the Japanese patent has poor dispersibility and low resistance to toluene solvent

Although the Chinese patent improves the wettability and dispersibility of fluororesin to paint pigments, the resistance to alcohol and other solvents is also reduced

However, tetrafluoroethylene is a "hard monomer". The more tetrafluoroethylene units in the molecular chain of a copolymer of tetrafluoroethylene and vinyl acetate and other monomers, the stronger the rigidity of the polymer chain, and the fluorine coating resin dissolves. The worse the property is, the fluorine coating will be easy to delaminate and the workability will be poor.

When the mole fraction of tetrafluoroethylene unit reaches 50%, the solubility and processability of fluorine coating resin are very poor

The existence of non-fluorine segment will inevitably affect the performance of fluorine coatings, and because the non-fluorine polymerization monomer used in the above method participates in polymerization, the distribution of tetrafluoroethylene monomer segment in the polymer will be uneven, which will also affect Resin properties