Water-based finishing paint for plastics and preparation method and application thereof

Abstract

The invention relates to a water-based finishing paint for plastics and a preparation method and application thereof; the water-based finishing paint comprises a hydroxylated acrylic resin, a wetting agent, a flatting agent, a deforming agent, deionized water and an aliphatic polyisocyanate curing agent; the preparation method comprises the following steps of: firstly, weighing the hydroxylated acrylic resin according to a formula dosage, then adding the wetting agent, the flatting agent and the deforming agent under high-speed stirring, uniformly mixing and stirring, then adding the deionized water to dilute a mixture, slowly adding the aliphatic polyisocyanate curing agent under the stirring state, stirring till the raw materials are uniformly mixed, adjusting viscosity to be 13-22 seconds (testing under a 25-DEG C normal temperature by using an NK-2 IWATA cup), filtering, discharging, and preparing the water-based finishing paint for plastics; and when being applied, the water-based finishing paint for plastics is coated on a priming paint of a plastic shell such as a shell of a cell phone, a shell of a panel personal computer and the like. The water-based finishing paint is non-corrosive as water is used as a dispersion medium and solves the problem of difficulty to adhere of the water-based finishing paint by adopting the hydroxylated acrylic resin; and the large-batch production of the water-based finishing paint is easily realized, and the properties of the water-based finishing paint product are stable.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to water-based coating technology, in particular to a water-based topcoat for coating plastic materials and a preparation method and application thereof. Background technique [0002] At present, although oil-based coatings are the main coatings for plastics, the market for water-based coatings will continue to rise with the increasingly stringent environmental regulations and the gradual improvement of its own technology. Plastic water-based coatings that combine high performance and low VOC content have more Broad application prospects. The development of water-based plastic coatings is bound to be more in line with the requirements of the times, and will eventually replace oil-based coatings. [0003] The research on water-based plastic coatings in my country is very active, but the scale of real industrial production is still very small. Only a few fields such as automobiles,...

AI Technical Summary

Problems solved by technology

[0004] Water-based coatings use water as the dispersion medium and will not corrode the plastic substrate. It is very difficult to adhere to the plastic surface. It must be specially designed from the composition, structure and preparation method of the film-forming resin and water-based coatings. There are considerable technological differences. difficulty

[0005] At present, there are few water-based coatings that can be used for plastic casings such as mobile phone casings and tablet computer casings, and the application is limited to primers, because the comprehensive performance of water-based topcoats is relatively poor.