Preparation method of transparent anionic aqueous polyurethane polymer high-light coating

Abstract

The invention discloses a preparation method of a transparent anionic aqueous polyurethane polymer high-light coating. A terminated isocyanate group prepolymer is prepared from diisocyanate, low-polymer polyol and small molecular alcohol to neutralize an isocyanate terminated prepolymer, a water dispersed isocyanate terminated prepolymer is formed in water, the isocyanate terminated prepolymer is subjected to chain extension by reaction with active hydroxyl chain extenders to prepare a stable aqueous polyurethane polymer, and auxiliaries are added as required and regulated to obtain the aqueous polyurethane coating. The prepared aqueous polyurethane coating is transparent and colorless in appearance, solid content is 40%, light reaches up to 100-120, a dry film is transparent, skin feeling is smooth, and the coating is low in temperature and free from crystallization after long-time placement and has excellent alkaline water resistance and solvent resistance. Moreover, as the coating is simple in manufacturing process, raw materials are easily purchased, the coating has quite high economical practicability, the situation of high-performance expensive coatings difficultly accepted by the market is solved, and environmental pollution is greatly reduced as all the used raw materials are environmentally friendly in specification.

Description

technical field [0001] The invention relates to a preparation method of surface coating polymers of various substrates such as rubber, plastic, fiber, leather, paper, etc., which are used for protection or decoration, increase the performance of materials, and increase the added value of materials. It belongs to the field of polymers, coatings, water-based polyurethanes, and polymer synthetic materials. Background technique [0002] As we all know, packaging finishing, which is closely related to our lives, is accompanied by every step in the growth of the coating field, including the coating and modification of the surface of substrates such as paper, plastic, fiber, cotton, plastic, rubber, leather, etc., involving people's daily life Food and beverage packaging, medical and health care, daily necessities, even industrial supplies, and national defense. With the enhancement of people's awareness of environmental protection, the reduction of VOC content in the atmosphere i...

AI Technical Summary

Problems solved by technology

[0004] At present, the water-based polyurethane system is used as a high-gloss coating, the solid content is only 20-35%, and the viscosity is like a paste, which limits the application range of high solid content and low viscosity

The gloss is generally around 80-90°, the yellowing resistance level is 3-4, and the temperature resistance is 120°C and it will turn yellow in 1-2 hours, even with sticky aging. The conventional method is to add 1-5% during the use of the resin The curing agent is used to improve heat resistance, but this will increase the production process and increase the production cost, which is not conducive to wide practical application

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