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Method for preparing isocyanate terminated polyether/phenolic resin foamed plastic

A phenolic resin foam and isocyanate-terminated technology, applied in the field of foam insulation materials, can solve problems such as poor compatibility of phenolic resins, and achieve the effects of improving poor heat resistance, solving poor toughness and stable reaction speed

Inactive Publication Date: 2012-07-04
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 few side reactions and the reaction is easy to control; special expandable phenolic resin is used to solve the problem. The problem of poor compatibility between the polyurethane prepolymer and the bulk phenolic resin is solved, and the reaction speed between the phenolic resin and the isocyanate group is stable, and the prepared foam density is moderate, at 56kg / m 3 -109kg / m 3 Among them, the foam has good temperature resistance, toughness and non-chalking characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0025] 2) Weigh 48 parts of isocyanate-terminated polyether prepolymer as component B;

[0026] 3) Pour component B into component A, mechanically stir for 10 seconds, pour 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 / m 3 , when the yield point is reached, the bending strain is 21%, the maximum bending stress is 0.42MPa, and the mass loss rate is 2.47% after baking at 150°C for 2 hours.

Embodiment 2

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

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

[0031] 3) Pour component B into component A, stir mechanically for 15 seconds, pour 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 / m 3 , when the yield point is reached, the bending strain is 22%, the maximum bending should be 0.35MPa, and the mass loss rate is 3.12% after baking at 150°C for 2 hours.

Embodiment 3

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

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

[0036] 3) Pour component B into component A, mechanically stir for 12 seconds, pour 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 / m 3 , when the yield point is reached, the bending strain is 25%, the maximum bending stress is 0.32MPa, and the mass loss rate is 3.91% after baking at 150°C for 2 hours.

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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 insulation material by using a physical foaming agent with simple process, strong operability, no corrosion, heat resistance, no pulverization, and good toughness. The invention belongs to the field of foam insulation materials. Background technique [0002] Phenolic foam plastic has been paid more attention in the past two decades due to its excellent characteristics of heat insulation, flame retardancy, low smoke generation, low toxicity and dimensional stability, and has been widely used as heat insulation materials and sound insulation materials. , packaging materials, building decoration materials and high water-absorbing materials, etc. 29-31; Ma Xiaoxiong, He Bin, Hu Xinyuan, Yang Yong. Preparation and performance evaluation of phenolic foam for anti-accident packaging boxes [J]. Engineering Plastics, 2008, 36...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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