Cross-linking type fluorine-containing acrylic resin

Abstract

The invention relates to a crosslinking type fluorine-containing acrylic resin, which is obtained by the heating and polymerization of more than one acrylic acid type monomer under initiator. The invention is characterized in that: the amount of each monomer applied in polymerization reaction is according to weight portions: methyl methacrylate 5-10 portions, alkyl acrylate monomer 10-20 portions, functional acrylic acid monomer 5-10 portions, fluorine-containing acrylic monomer 10-25 portions, organic solvent 40-60 portions; the fluorine-containing acrylic monomer is either or both of trifluoroethyl methacrylate and trifluoroethyl acrylate; the content of the fluorine-containing acrylic monomer takes 20-50 percent of the total weight of all monomer applied in the polymerization reaction. The resin can be crossingly cured at normal temperature and low medium temperature and has the wide application. Coating produced with the resin, comprehensive performance of which is close to fluorocarbon coatings maintains performance price ratio advantage of the acrylic resin.

Description

technical field [0001] The invention relates to a cross-linked fluorine-containing acrylic resin. More specifically, the present invention relates to a cross-linked fluorine-containing acrylic resin that maintains the cost performance advantage of acrylic resin, is low in price, and has the same overall performance as fluorocarbon resin. Background technique [0002] The unique fluorine-carbon bond in the molecular structure of fluorocarbon resin endows the fluorocarbon resin coating with excellent properties such as ultra-long weather resistance, chemical corrosion resistance, stain resistance and self-cleaning property. However, traditional fluorocarbon resins (such as Teflon series fluorocarbon resins and polyvinylidene fluoride resins) have high crystallinity, poor solubility, and poor adhesion to the substrate. The selection of raw materials such as pigments and fillers has special requirements, which limits the use and promotion of fluorocarbon resins. The recently d...

AI Technical Summary

Problems solved by technology

However, traditional fluorocarbon resins (such as Teflon series fluorocarbon resins and polyvinylidene fluoride resins) have high crystallinity, poor solubility, and poor adhesion to the substrate. There are special requirements for the selection of raw materials such as pigments and fillers, which limits the use and promotion of fluorocarbon resins

The recently developed cross-linked fluorocarbon resins, such as copolymer resins of fluoroolefins and vinyl ethers or vinyl esters (referred to as FEVE resins), are formed by copolymerization of chlorotrifluoroethylene or tetrafluoroethylene with vinyl monomers. The main advantages It has excellent weather resistance and expands the application range of fluorocarbon resin coatings; the disadvantage is that the copolymerization reaction to form the resin requires high pressure, and at the same time, the choice of comonomer types is poor. The weather resistance of fluorocarbon resin coatings is equivalent to that of ordinary acrylic resin coatings, but its price is much more expensive than acrylic resin coatings. In addition, the selectivity of solvents in use is also limited

The Chinese patent application with the application number 200510021181.7 is a one-component thermoplastic fluorocarbon coating, in which the fluorine-containing acrylic resin is synthesized from a fluorine-containing trifluoroethyl methacrylate monomer with a mass percentage of less than 10%. Calculated from the molecular weight of trifluoroethyl methacrylate of 168, the content of fluorine atoms in the resin is about 3%. It is difficult for the coating prepared by it to substantially achieve the performance similar to that of fluorocarbon resin coatings. In addition, the thermoplastic fluorine The limitations of the inherent properties of carbon resins, especially resins that are less resistant than thermosetting resins

Although it has been applied in helicopter skin coatings, since the amount of the fluorine-containing monomer hexafluorobutyl methacrylate used accounts for 5-15% of the total amount of synthetic monomers, it is difficult to control the molecular chain of the polymer. The section provides an effective "shielding protection" effect, and the weather resistance and stain resistance of the resin cannot be fully manifested; the fluorine-containing monomer used and other acrylate monomers used for copolymerization have a large difference in the competition rate (Q-e value) , is not conducive to the formation of ideal resins with alternating structures; the ester alkoxy part in the isobornyl methacrylate monomer structure is a huge non-polar bicycloalkyl group, and the space of the huge bicycloalkyl group The steric hindrance effect, the influence on the reactivity rate during free radical polymerization, will cause the molecular structure of the polymer to be unbalanced, so the fluorine-modified acrylic resin of this application is easy to form fluorine-containing monomers in the polymer molecule The two ends of the chain segment are enriched, and the middle part is a "dumbbell-shaped" molecular structure that is exposed and has no "shielding protection" of fluorine-containing monomers

Therefore, the application uses hexafluorobutyl (meth)acrylate as a fluorine-containing monomer, and the synthesized fluorine-modified acrylic resin is used for industrial coatings, and the paint film has excellent performance in medium corrosion resistance, weather resistance, and stain resistance. , especially in terms of the durability of the paint film, it is difficult to meet the actual requirements