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Preparation method of polyurethane prepolymer-toughened modified phenolic foam plastic

A technology of polyurethane prepolymer and phenolic foam, which is applied in the field of preparation of polyurethane prepolymer toughened and modified phenolic foam, can solve the problems of high brittleness of phenolic foam, low viscosity of phenolic resin, and easy pulverization, etc., to achieve Good flame retardancy, improved toughness, and improved compressive strength

Inactive Publication Date: 2014-10-08
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Technical problem to be solved: In order to solve the shortcomings of phenolic foam plastics in the prior art, such as high brittleness, easy pulverization, low strength and poor toughness, the present invention provides A method for preparing polyurethane prepolymer toughened and modified phenolic foam plastics. The prepared phenolic foam has the advantages of less slag dropping and high toughness. At the same time, the phenolic resin used in the present invention has low viscosity and is compatible with polyurethane prepolymers. good, easy to mix well

Method used

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  • Preparation method of polyurethane prepolymer-toughened modified phenolic foam plastic

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Embodiment 1

[0030] (1) Preparation of toughening agent polyurethane prepolymer: firstly, the polyether oxide propylene glycol (PPG 2000) was vacuumized at 110 °C for 2 h to remove moisture, and 85 g of dehydrated polyether oxide propylene glycol (PPG 2000) 2000) was added dropwise into 32 g of diphenylmethane diisocyanate (MDI), reacted for 2 h at 75 ° C, and then added 1.2 g of chain extender 1,4-butanediol and reacted for 30 min to prepare the toughening agent polyurethane preprepared polymer with an isocyanate content of 4.5 %.

[0031] (2) Toughened phenolic foam: adjust 100 parts of basic resole phenolic resin to pH 7.0 with phosphoric acid in parts by mass (Kg), and then add 6 parts of toughening agent polyurethane prepolymerization prepared in step (1) to the resin Body, 6 parts of surfactant Tween-80, 8 parts of foaming agent petroleum ether and 12 parts of composite acid curing agent (wherein the mass ratio of phosphoric acid, p-toluenesulfonic acid, concentrated sulfuric acid an...

Embodiment 2

[0039] (1) Preparation of toughening agent polyurethane prepolymer: First, vacuumize polyethylene glycol (PEG 6000) at 110 °C for 2 h to remove moisture, then add 300 g of dehydrated polyethylene glycol (PEG 6000) dropwise Add 26 g of diphenylmethane diisocyanate (MDI), react at 60 ° C for 3 h, then add 3.3 g of chain extender ethylene glycol and react for 40 min to prepare a toughening agent polyurethane prepolymer, wherein the isocyanate content is 2.5%;

[0040] (2) Toughened phenolic foam: adjust 100 parts of basic resole phenolic resin to pH 7.0 with sulfuric acid in parts by mass (Kg), then add 9 parts of toughening agent polyurethane prepolymer and 4 parts of surfactant to the resin Nonylphenol polyoxyethylene ether, 7 parts of blowing agent n-pentane and 16 parts of composite acid curing agent (wherein the mass ratio of phosphoric acid, p-toluenesulfonic acid, concentrated sulfuric acid and water is 0.2:0.3:2.4:1), to obtain Foaming system;

[0041] (3) The foaming s...

Embodiment 3

[0048] (1) Preparation of toughening agent polyurethane prepolymer: firstly, polyethylene adipate (number average molecular weight 710) was vacuumized at 110 °C for 2 h to remove moisture, and 71 g of dehydrated polyethylene adipate Ethylene glycol ester (number average molecular weight 710) was added dropwise to 87 g of 1,6-hexamethylene diisocyanate (HDI), reacted at 70°C for 2.5 h, and then added 8.0 g of chain extender glycerol for 20 min to prepare the chain extender Toughener polyurethane prepolymer with an isocyanate content of 10.5%.

[0049] (2) Toughened phenolic foam: adjust 100 parts of basic resole phenolic resin to pH 7.0 with hydrochloric acid in parts by mass (Kg), then add 12 parts of toughening agent polyurethane prepolymer and 11 parts of surfactant to the resin Fatty acid methyl ester ethoxylate series, 9 parts of foaming agent dichloromethane and 18 parts of compound acid curing agent (the mass ratio of phosphoric acid, p-toluenesulfonic acid, concentrated...

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Abstract

The invention relates to a preparation method of polyurethane-prepolymer-toughened modified phenolic foam plastic, which comprises the following steps: vacuumizing and dehydrating polyalcohol, dropwisely adding the polyalcohol into isocyanate to react in a nitrogen atmosphere, and adding a chain extender to react; regulating an alkaline A-stage phenol formaldehyde resin with acid according to parts by mass, adding a toughener polyurethane prepolymer, a surfactant, a foaming agent 1 and a curing agent into the resin to obtain a foamed system; and stirring uniformly the foamed system at room temperature, and heating to cure and form to obtain the polyurethane-prepolymer-modified flame-retardant phenol formaldehyde foam thermal-insulation material. The phenol formaldehyde foam has the advantages of less shedding, high toughness and the like; and the adopted phenol formaldehyde resin has the advantages of low viscosity and favorable compatibility with the polyurethane prepolymer, and can be easily mixed uniformly.

Description

[0001] technical field [0002] The invention relates to a toughening method of phenolic foamed plastics, in particular to a preparation method of polyurethane prepolymer toughened and modified phenolic foamed plastics. [0003] Background technique [0004] Phenolic foam, as the most promising new type of thermal insulation material, is a foam prepared by curing at a certain temperature after uniform mixing of expandable phenolic resin, surfactant, curing agent, foaming agent and other additives. Phenolic foam has a high closed cell rate and a rigid structure of benzene rings. It has the advantages of heat insulation, light weight, flame retardancy, dimensional stability and chemical corrosion resistance. It is widely used in the construction industry, food refrigeration and other fields. However, phenolic foam also has some disadvantages, such as poor toughness and easy pulverization, which seriously limit the popularization and application of phenolic foam. Toughening an...

Claims

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Application Information

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IPC IPC(8): C08J9/14C08L61/06C08L75/08C08L75/06C08G18/76C08G18/66C08G18/48C08G18/42C08G101/00
Inventor 陈日清刘娟丁海阳王春鹏储富祥
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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