Low-temperature-resistant and abrasion-resistant polyurethane coating and preparation method thereof

Abstract

The invention relates to a low-temperature-resistant and abrasion-resistant polyurethane coating and a preparation method thereof. The low-temperature-resistant and abrasion-resistant polyurethane coating is prepared from, by weight, 45-60 parts of polyurethane matrix resin, 0.5-6 parts of low-temperature polyester polyols, 3-20 parts of surface modifier modified micron powder, 5-12 parts of curing agents, 30-50 parts of solvent and 0.5-3 parts of defoamer. The low-temperature-resistant performance of the obtained polyurethane coating can be excellent by adding the low-temperature-resistant polyurethane matrix resin on the basis that the strong adhesion, excellent room-temperature mechanical performance, good stability and other characteristics of original polyurethane coatings are retained, the hardness of the coating is improved by adding the micron powder, and accordingly the coating has excellent abrasion-resistant performance. The coating can be used for protection of aircraft, wind turbine blades and other facilities in a low-temperature environment.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a modified polyurethane coating with excellent low-temperature performance and wear resistance and a preparation method thereof. Background technique [0002] Polyurethane resin is one of the main types of coating base materials at the present stage. Polyurethane has a structure of soft and hard segment front-end copolymers. This unique structure makes polyurethane products have excellent comprehensive mechanical properties: good mechanical properties, aging resistance, oil resistance, hardness The adjustable range is large, and these excellent properties are unmatched by many other materials. Polyurethane coatings are generally used at temperatures above zero degrees Celsius, but for some areas in northern my country, the winter temperature is zero degrees or even below zero, which requires polyurethane coatings to have high low temperature flexibility. Adding speci...

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Problems solved by technology

Adding special polyols to modify polyurethane will not affect the original polyurethane structure, and at the same time, the original coating will have better low temperature resistance. Chinese patent CN101033368A provides a method for synthesizing ultra-low temperature polyurethane coatings using polyether polyols and toluene dicyanate , polyurethane has good low temperature resistance, but its cost is high and its mechanical properties are poor, which limits its application in low temperature environment

[0003] The polyurethane system filled with inorganic particles can obtain certain toughness, strength and hardness after curing. Chinese patent CN 105238253A discloses a kind of chlorinated paraffin, iron oxide red, nitrocellulose, carbon nanotubes, modified wollastonite, scale Shaped aluminum flakes, mica powder and graphite powder modified wear-resistant polyurethane coatings, but the cost of carbon nanotubes is high, and there are too many types of modified fillers, and the size of the particle materials is too small, and there may be problems in the concentration and dispersion in the original polyurethane, which leads to coatings The concentration of internal stress reduces the mechanical properties of the coating and affects the use of the coating. Therefore, it is imperative to develop a one-component modified polyurethane coating with good dispersion and low temperature resistance.

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