External thermal-insulation environment-friendly composite polyether for delivering high-temperature media and preparation method thereof

Abstract

The invention relates to an external thermal-insulation environment-friendly composite polyether for delivering high-temperature media and a preparation method thereof, belonging to the field of synthesis of chemical industrial products. Water is used as a foaming agent. The composite polyether is prepared from the following components in parts by weight: 30-45 parts of polyether glycol A, 20-40 parts of polyether glycol B, 5-20 parts of polyether glycol C, 5-15 parts of polyester polyol, 3-5 parts of crosslinking agent, 2.0-4.0 parts of water, 2.0-4.0 parts of surfactant, 1.2-3.8 parts of catalyst, 2-3.5 parts of temperature resisting agent and 3-9 parts of viscosity breaker. The preparation method comprises the following steps: adding the polyether glycols and polyester polyol into a reaction kettle, and stirring; and adding the crosslinking agent, surfactant, catalyst, temperature resisting agent and viscosity breaker, mixing, and stirring. The invention enhances the ageing resistance of foam under high-temperature conditions, has the advantages of excellent high-temperature dimensional stability, environmental protection, environment friendliness, and can satisfy the requirements for long-term high-temperature delivery.

Description

technical field [0001] The invention belongs to the field of synthesis of chemical products, and in particular relates to an environment-friendly composite polyether for external heat preservation of pipelines conveying high-temperature media and a preparation method thereof. Background technique [0002] Polyurethane foam is currently the best of all thermal insulation materials, widely used in heating pipelines, petrochemical pipelines, transportation, refrigerator freezers, building insulation, aviation and military, and many other aspects. In my country, with the implementation of the country's western development policy, the popularization of urban central heating and the renovation of old cities, the insulation pipe industry has developed rapidly in recent years. Polyurethane rigid foam has now developed into the most widely used pipe insulation material in the country. , due to the long-term transport of high-temperature medium by polyurethane heating insulation pipe p...

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Problems solved by technology

In my country, with the implementation of the country's western development policy, the popularization of urban central heating and the renovation of old cities, the insulation pipe industry has developed rapidly in recent years. Polyurethane rigid foam has now developed into the most widely used pipe insulation material in the country. , due to the long-term transport of high-temperature medium by polyurethane heating insulation pipe products, the polyurethane foam will undergo heat aging over time. After aging, the thermal conductivity of the polyurethane foam will increase and the shear strength will decrease. At the same time, due to the constraints of the process, the polyurethane insulation pipe Most of them are buried in the ground. Due to the long-term work under high temperature conditions and the pressure of the soil, the deformation of the foam over time is relatively large, resulting in large creep deformation, which will gradually reduce the thickness of the insulation layer. The thermal conductivity and compressive strength will be reduced, and the thermal insulation performance of polyurethane foam will be significantly reduced, which will greatly affect the heating effect and cause waste of resources

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