Combined polyether, raw material composition, polyurethane foam as well as preparation method and application thereof

Abstract

The invention discloses combined polyether, a raw material composition, polyurethane foam as well as a preparation method and application thereof. The combined polyether comprises the following components in parts by weight: 100 parts of polyol, 1-4 parts of a surfactant, 0.3-1.3 parts of a chemical foaming agent, 1-3 parts of a catalyst, 15-30 parts of a flame retardant and 15-30 parts of a physical foaming agent, wherein polyol is a mixture of 40-60 parts of polyether polyol A, 20-40 parts of polyester polyol B and 10-20 parts of phthalic anhydride polyol. The foam has the advantages of excellent comprehensive property, low cost, a certain thermal insulation fire-retardant property and is simple in preparation method, safe to operate and wide in application range, high in construction and foam curing speed and short in time from mixing to foam molding curing ( only 10 minutes) and can be used in high-temperature, wind, cold and other 5-40 DEG C terrestrial environments.

Description

technical field [0001] The invention relates to a pouring type combined polyether for pipe joints, a polyurethane raw material composition, polyurethane foam, a preparation method and application thereof. Background technique [0002] Due to its high-quality thermal insulation performance, polyurethane rigid foam has a wider and wider range of applications, and has gradually been applied to the field of thermal insulation pipelines. These heat insulation pipes are all produced in the factory under set controllable conditions, and the pipe connection can only be carried out under the weather conditions of the construction site, and additional heat preservation work is still required after the welding of the joint is completed. [0003] At present, asphalt pouring joint technology is mainly used in China for thermal insulation pipeline connection. Asphalt pouring has certain defects. It needs to be heated at high temperature in the process of use, and the operation time is lon...

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Problems solved by technology

[0004] The invention overcomes the need for on-site heating and high temperature when asphalt pouring is used in the prior art for heat insulation and heat preservation pipeline connection, long operation time and poor operation safety, which easily lead to burns, and at the same time, the smell emitted by asphalt during the heating process is also harmful to the health of workers Great impact, and the filling effect at the head is not necessarily good, the workload of the construction site and the speed of laying pipelines are increased during the heating process; and the full-water open-cell rigid polyurethane foam used for subsea pipeline joints, on the one hand, is heat-conducting The coefficient is high, and a certain cold and heat bridge will be formed when it is connected with a pipeline with a good thermal insulation coefficient. The scope of application is not wide, the adaptability to extreme weather is poor, the operation tolerance is low under high temperature and low temperature conditions, and it is generally not flame retardant, so a combination of polyether, raw material composition, polyurethane foam and its Preparation method and application

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