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Method for synthesizing expandable phenolic resin

A technology of phenolic resin and synthesis method, which is applied in the field of thermal insulation materials, can solve the problems of poor compatibility of polyurethane prepolymers, and achieve the effects of easy temperature control, strong operability and good compatibility

Inactive Publication Date: 2012-06-20
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor compatibility between ordinary expandable phenolic resin and polyurethane prepolymer, and provide a kind of expandable phenolic resin with good compatibility with polyurethane, low viscosity, high solid content, simple operation process and low pollution. The synthetic method of permanent phenolic resin, the expandable phenolic resin obtained by this synthetic method can directly react with polyurethane prepolymer to prepare tough, non-pulverizing phenolic / polyurethane foam

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Add 1 part of phenol, 0.02 part of zinc oxide and 1.1 part of paraformaldehyde to the flask equipped with a stirring paddle, a thermometer and a reflux condenser.

[0023] 2) Turn on the stirring paddle, heat to 75°C, react at constant temperature for 60 minutes, and then continue to heat up to 85°C.

[0024] 3) After reacting at a constant temperature of 85°C for 120 minutes, stop heating and end the experiment.

[0025] The obtained expandable phenolic resin has good compatibility with polyurethane without phase separation; the viscosity of the phenolic resin is 2.45 Pa.S, and the solid content is 82.37%.

Embodiment 2

[0027] 1) Add 1 part of phenol, 0.02 parts of magnesium oxide, and 1.4 parts of paraformaldehyde to the flask equipped with a stirring paddle, a thermometer and a reflux condenser.

[0028] 2) Turn on the stirring paddle, heat to 80°C, react at constant temperature for 60 minutes, and then continue to heat up to 85°C.

[0029] 3) After reacting at a constant temperature of 85°C for 90 minutes, stop heating and end the experiment.

[0030] The obtained expandable phenolic resin has good compatibility with polyurethane and no phase separation phenomenon; the viscosity of the phenolic resin is 2.27 Pa.S, and the solid content is 83.91%.

Embodiment 3

[0032] 1) Add 1 part of phenol, 0.010 parts of ammonia water, 0.015 parts of barium hydroxide and 1.6 parts of paraformaldehyde to the flask equipped with a stirring paddle, a thermometer and a reflux condenser.

[0033] 2) Turn on the stirring paddle, heat to 81°C, react at constant temperature for 60 minutes, and then continue to heat up to 93°C.

[0034] 3) After reacting at a constant temperature of 93°C for 60 minutes, stop heating and end the experiment.

[0035] The obtained expandable phenolic resin has good compatibility with polyurethane and no phase separation phenomenon; the viscosity of the phenolic resin is 2.03 Pa.S, and the solid content is 82.65%.

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Abstract

The invention discloses a method for synthesizing an expandable phenolic resin, and belongs to the field of heat insulating materials. The method comprises the following steps of: adding phenol, a catalyst and paraformaldehyde into a reactor, wherein the mass ratio of the paraformaldehyde to the phenol is 1.1-1.9:1 and the mass ratio of the catalyst to the phenol is 0.01-0.04:1; stirring, heatingthe mixture to 70 to 85 DEG C and performing an isothermal reaction for 30 to 90 minutes; and continuously performing the isothermal reaction at the temperature of between 80 and 95 DEG C for 30 to 150 minutes and then stopping the reaction. The phenolic resin prepared by the method has the advantages of high compatibility with polyurethane, low viscosity and high solid content. The method has the advantages of simple operation process and low pollution.

Description

technical field [0001] The invention relates to a synthesis method of expandable phenolic resin with good compatibility with polyurethane, low viscosity, high solid content, simple operation process, low pollution, relatively mild reaction with polyurethane prepolymer and high expansion ratio, belonging to The field of thermal insulation materials. Background technique [0002] Phenolic resin is a synthetic resin obtained by polycondensation of phenol and formaldehyde. It is the first artificially synthesized polymer compound and the earliest synthetic resin in the world to achieve industrial production. It has a history of more than 100 years. Due to its easy availability of raw materials, low price, simple production process and equipment, and the cured product has excellent mechanical properties, heat resistance, cold resistance, electrical insulation, dimensional stability, molding processability, flame retardancy and low smoke , so it has become an indispensable materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/10C08G18/54C08G101/00
Inventor 程珏文振广许亮
Owner BEIJING UNIV OF CHEM TECH
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