Ultraviolet-cured hydrophilic coating composition and preparation method thereof

Abstract

The invention relates to a highly-hydrophilic transparent ultraviolet-cured coating composition and a preparation method thereof. The ultraviolet-cured hydrophilic coating composition comprises light-cured resin, a polymerization monomer, a reactive diluent, a light initiator, an auxiliary and pigment. The preparation method comprises accurately weighing the light-cured resin according to a formula and pouring the light-cured resin into a mixing kettle, sequentially adding the polymerization monomer, the reactive diluent and the auxiliary into the mixing kettle, and stirring the mixture for 20-45 minutes; adding the light initiator into the mixing kettle, mixing for 15-35 minutes to obtain ultraviolet-cured hydrophilic coating, and storing the ultraviolet-cured hydrophilic coating away from the light; and when the ultraviolet-cured hydrophilic coating is used, adding the pigment and performing even mixing. The ultraviolet-cured hydrophilic coating composition can be coated on base materials of plastic, metal, glass and the like. An ultraviolet-cured coating has excellent hydrophilcity and good physical performance, adhesive force, hydrolytic resistance, salt fog resistance and alkali resistance.

Description

technical field [0001] The invention belongs to the technical field of ultraviolet light curing coatings, in particular to a transparent ultraviolet light curing coating composition with high hydrophilicity and a preparation method thereof. Background technique [0002] With the continuous improvement of people's living standards, the requirements for hydrophilicity in the industrial and living fields are increasing day by day, which has given birth to the application in wood, paper, plastic, leather, metal, glass, ceramics, optical fiber, printed circuit board, electronic component packaging, etc. Application on various substrates. Especially in air conditioner products, hydrophilic coatings have been well applied. With the successive promulgation of national energy conservation law and environmental protection law, air conditioners are constantly developing in the direction of miniaturization, light weight and high performance. The function and performance put forward hig...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN101914175A provides a preparation method of self-initiated UV curing amphiphilic polymer resin, which belongs to the UV curing (UV) technology without photoinitiator and photosensitive The technical field of polymer materials; the present invention bridges the photosensitive substance coumarin and amphiphilic acrylic resin through diisocyanate, endows the traditional acrylic resin with the ability to self-initiate UV curing, and obtains a self-initiating UV-curable amphiphilic polymer Resin; this kind of polymer resin can realize self-initiated photopolymerization, curing and crosslinking in a specific wavelength range without adding photoinitiator during use; it has good stability, low temperature fast curing ability and environmental friendliness, and can be used in Functional coatings, optoelectronic materials, photosensitive materials, microelectronic materials, biological materials and other fields; however, this coating needs to be stored away from light, and it is easy to generate gel

[0004] Chinese patent CN1869139A provides a UV-curable waterborne polyurethane acrylate coating resin and its preparation method, mainly using aromatic diisocyanate, polyethylene glycol, polyhydroxy Carboxylic acid, diol, hydroxyethyl methacrylate (or hydroxypropyl methacrylate), triethylamine and other raw materials, first drop polyethylene glycol into aromatic diisocyanate, and react to obtain polyurethane pre- polymer I; then polyhydroxy carboxylic acid is added to the polyurethane prepolymer I, and then dibasic alcohol is added dropwise, and the reaction obtains the polyurethane prepolymer II; then the hydroxyethyl methacrylate (or Hydroxypropyl methacrylate) is added dropwise to polyurethane prepolymer II to react to obtain polyurethane acrylate oligomer; add triethylamine to the oligomer to carry out salt-forming reaction, then add water, stir, and emulsify to obtain ultraviolet light Curing water-based polyurethane acrylate coating resin, this coating resin has excellent water solubility, good flexibility, fast light curing speed, and the stability of the emulsion diluted with water is very good; but the hydrophobic monomer of this coating Less, the hydrophilic performance cannot be continuously guaranteed, and the alkali resistance and salt spray resistance are poor

The resulting hydrophilic layer can absorb water and form a layer of water on the surface of the film without affecting the transparency; however, due to the swelling and softening of the coating after water absorption, the mechanical properties decrease; although the cross-linking of the coating can improve the mechanical properties, its Anti-fog performance will decrease

[0010] Japanese Patent JP H08-176466A (1996) provides a kind of anti-fog coating composition, it comprises a kind of metal oxide microparticle dispersion sol, a kind of Organosilicon compounds with epoxy groups or their partial hydrolysis products, and anionic surfactants containing at least one of sulphonates, sulphonates, phosphates or carbonates; however, it requires a precoat to Guaranteed adhesion; moreover, it is prone to cracks during thermoforming