Aqueous two-component wood varnish and application thereof

Abstract

The invention discloses an aqueous two-component wood varnish and application thereof. The aqueous two-component wood varnish mainly comprises a main agent and a curing agent. The main agent comprises the following components in percentage by mass: 60-80% of emulsion containing hydroxyl polymer, large than 0 and less than or equal to 6% of polycarbodiimide cross-linking agent. The curing agent mainly comprises the following component in percentage by mass: 80-85% of water dispersible polyisocyanate. By adopting double cross-linking, a varnish film with sensory effect and final performance better than that of a one-component aqueous self-crosslinking paint and an ordinary two-component aqueous paint is obtained; the varnish has the advantages of quick varnish film drying speed, quick performance improving speed, excellent varnish film performance and small dosage of aqueous isocyanate. The aqueous two-component aqueous varnish can be used as surface paint in match with the one-component priming paint which is excellent in initial water resisting property and quick in hardness improvement, thereby achieving the coating effect and performance of the conventional two-component aqueous paint at lower cost.

Description

technical field [0001] The invention belongs to the field of water-based paint, and in particular relates to a water-based two-component wood varnish and its application. Background technique [0002] Coating is a very important functional material for national economic construction and national defense security. Its main function is to decorate, protect or give new appearance or function to materials, such as giving beautiful colors to utensils, and isolating the damage of substrates by ultraviolet rays, water or other media , or provide special functions such as electromagnetic shielding, absorption and reflection of infrared rays. According to statistics, in 2013, the annual output of China's coatings has exceeded 13 million tons, ranking first in the world, and the annual growth rate of coatings production is higher than the growth rate of GDP. my country has become the largest country in the production and consumption of coatings in the world. With the enhancement of p...

AI Technical Summary

Problems solved by technology

CN102796448A discloses a water-based two-component white gloss varnish, which solves the problem of foaming in the thick coating of the two-component white gloss varnish

The polyisocyanate curing agent mainly reacts with the hydroxyl groups in the polymer, and the polyethylenimine mainly reacts with the carboxyl groups in the polymer. Therefore, if a single curing agent is used, there will inevitably be a large number of residual hydroxyl groups or carboxyl groups, which will adversely affect the performance of the paint film.

[0026] (3) A large number of cross-linking reactions occur during the curing and film-forming process of two-component coatings, so it takes a certain amount of time to increase the performance of the paint film. The time for the performance of the paint film to rise is too long, which affects the production efficiency of the factory and increases labor costs and Time costs

[0027] (4) Most of the core technologies of water-based isocyanate curing agents used in two-component water-based wood coatings are mastered by foreign-funded companies, and the source mainly relies on imports. The high price leads to high overall costs of two-component water-based wood coating

Images