Method for preparing isocyanate terminated polyether/phenolic resin foamed plastic

A technology of terminal isocyanate and phenolic resin, which is applied in the field of foam insulation materials, can solve the problems of poor compatibility of phenolic resin, achieve the effects of improving poor heat resistance, solving poor toughness, and simple operation process

Inactive Publication Date: 2010-11-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is to provide a method for preparing isocyanate-terminated polyether/phenolic resin foam by a physical blowing agent, adopting isocyanate-terminated polyether (polyurethane prepolymer) to replace traditional curing agent (acid), and expandable phenolic resin Form a two-component system to prepare a brand-new foam. In the system, a physical blowing agent is used, and organic/inorganic acids are no longer used as a blowing agent. There are

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024]1) Weigh 20 parts of alkaline expandable phenolic resin (water content 4.9%, viscosity 2.8Pa.S, 25°C) in a container, add 2.0 parts of Tween 60 and 0.3 parts of HFCs in turn, mix and stir for 30s to obtain a composition. Score A;

[0025] 2) take by weighing 48 parts of isocyanate-terminated polyether prepolymers as component B;

[0026] 3) Pour component B into component A, stir mechanically for 10s, pour it into a mold for foaming, and obtain an isocyanate-terminated polyether / phenolic resin foam insulation material.

[0027] The obtained foam is dense and uniform, the surface of the foam is not pulverized, and the volume stability is good; the density of the foam material is 109.24Kg / m2 3 , the bending strain is 21% when the yield point is reached, the maximum bending stress is 0.42MPa, and the mass loss rate is 2.47% after baking for 2 hours at 150 °C.

Example Embodiment

[0028] Example 2

[0029] 1) Weigh 20 parts of alkaline expandable phenolic resin (water content 3.5%, viscosity 0.9Pa.S, 25°C) in the container, add 1.8 parts of Tween 80, 0.5 parts of cyclopentane in turn, mix and stir for 45s, Make it evenly mixed to obtain component A;

[0030] 2) Weigh 40 parts of isocyanate-terminated polyether prepolymers as component B;

[0031] 3) Pour component B into component A, stir mechanically for 15 s, pour it into a mold for foaming, and obtain an isocyanate-terminated polyether / phenolic resin foam insulation material.

[0032] The obtained foam is dense and uniform, the surface of the foam is not pulverized, and the volume stability is good; the density of the foam material is 89.11Kg / m2 3 , the bending strain is 22% when it reaches the yield point, the maximum bending should be 0.35MPa, and the mass loss rate is 3.12% after baking for 2 hours at 150 °C.

Example Embodiment

[0033] Example 3

[0034] 1) Weigh 40 parts of alkaline expandable phenolic resin (water content 6.7%, viscosity 4.8Pa.S, 25°C) in the container, add 4.5 parts of silicone oil and 1.5 parts of n-pentane in turn, mix and stir for 65s to make it Mix evenly to obtain component A;

[0035] 2) Weigh 78 parts of isocyanate-terminated polyether prepolymers as component B;

[0036] 3) Pour component B into component A, stir mechanically for 12s, pour it into a mold for foaming, and obtain an isocyanate-terminated polyether / phenolic resin foam insulation material.

[0037] The obtained foam is dense and uniform, the surface of the foam is not pulverized, and the volume stability is good; the density of the foam material is 80.37Kg / m2 3 , the bending strain is 25% when the yield point is reached, the maximum bending stress is 0.32MPa, and the mass loss rate is 3.91% after baking for 2 hours at 150 °C.

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Abstract

The invention discloses a method for preparing isocyanate terminated polyether/phenolic resin foamed plastic and belongs to the field of foam heat insulating materials. The method comprises the following steps of: adding a surfactant and a foaming agent into special expandable phenolic resin to form a component A; and uniformly mixing and stirring the component A and an isocyanate terminated polyether pre-polymer serving as a component B; pouring the mixture into a mold; and foaming and curing the mixture at normal temperature, wherein the mass ratio of -NCO contained in the isocyanate terminated polyether pre-polymer to the expandable phenolic resin is 0.1-0.6:1; the foaming agent is a physical foaming agent of which the boiling point is low; the -NCO group content of the isocyanate terminated polyether pre-polymer is between 18.5 and 19.5 mass percent; and the viscosity of the isocyanate terminated polyether pre-polymer is between 0.15 and 0.65 Pa.S at the temperature of 25 DEG C. The speed of the reaction of the phenolic resin and an isocyanate group is stable and foam density is appropriate (between 56 and 109 kg/m<3>) and can be adjusted through the using amount of the foaming agent.

Description

technical field [0001] The invention specifically relates to a method for preparing an isocyanate-terminated polyether / phenolic resin two-component system foam thermal insulation material by using a physical foaming agent with simple process, strong operability, no corrosion, heat resistance, non-pulverization and good toughness, It belongs to the field of foam insulation materials. Background technique [0002] Phenolic foam has received much attention in the past two decades due to its excellent characteristics in terms of thermal insulation, flame retardancy, low smoke during combustion, low toxicity and dimensional stability, and has been widely used as thermal insulation materials and sound insulation materials. , packaging materials, building decoration materials and super absorbent materials, etc. [Wang Junxiao, Liu Xinmin, Pan Jiongxi, Wang Hongwu. Research on the properties of rigid phenolic foam for sandwich panels [J]. Modern Plastics Processing and Application, 2...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08J9/14C08G18/78C08G18/54C08G18/10C08G101/00
Inventor 程珏文振广许亮
Owner BEIJING UNIV OF CHEM TECH
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