Combined polyether, polyurethane raw material composition, polyurethane insulation material derived therefrom, preparation method and application thereof

Abstract

This application relates to a combined polyether, which is made of the following raw material components based on parts by weight: 40-60 parts of polyether polyol, 40-60 parts of polyester polyol, and 8-12 parts of catalyst , 2-3 parts of foam stabilizer, 15-18 parts of blowing agent, and 0.4-0.6 part of water; the hydroxyl value of the polyether polyol is 300-800mgKOH / g, and the viscosity at 25°C is 1000-30000mPa .s; the hydroxyl value of the polyester polyol is 250-350mgKOH / g, and the viscosity at 25°C is 2000-15000mPa.s. The present application also provides a polyurethane raw material composition comprising the above combined polyether, a polyurethane insulation material derived therefrom, and a method thereof. The application also provides the application of the polyurethane insulation material in the preparation of the insulation layer of the liquefied natural gas storage tank. The foaming reaction heat of the polyurethane thermal insulation material of this application is lower than 140°C, the volume change rate of the dimensional stability -180°C / 48h is less than -0.5%; the foam spraying density is 80-85kg / m 3 , the thermal conductivity is less than 22mw / m.k, and the insulation effect is good when the insulation layer is prepared on the liquefied natural gas tank. At the same time, it can prevent cracking and effectively resist external pressure resulting in foam damage.

Description

technical field [0001] The application relates to the technical field of polyurethane, specifically, the application relates to a combined polyether, a polyurethane raw material composition comprising the combined polyether, a polyurethane thermal insulation material derived from the polyurethane raw material composition, and the polyurethane thermal insulation material Preparation methods and applications. Background technique [0002] Natural gas is one of the three pillars of world energy, among which liquefied natural gas (LNG) has the advantage of high latent heat of vaporization. Under one atmospheric pressure, liquefied natural gas can release about 879J / kg of energy when it is transformed into a gaseous state at room temperature. Therefore, the significance of storing and transporting LNG is self-evident. However, the temperature of liquefied natural gas is relatively low, which can reach -165°C. Designing a material with low temperature resistance and good thermal...

AI Technical Summary

Problems solved by technology

[0005] The tank body insulation foam made by the spray foaming molding process has no cold bridge, can maximize the insulation effect, and is convenient to construct, and can meet the requirements of different shapes of tanks. However, due to the fast reaction speed of the spraying process, the The heat cannot be dissipated in time, which will cause problems such as heartburn inside the foam and overall cracking of the foam due to too high heat