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Preparation method of phenolic resin foam modified by cyanate ester resin

A technology of phenolic resin foam and base phenolic resin, which is applied in the field of resin foam preparation, can solve the problems of high thermal conductivity and limited application range, and achieve the effects of low thermal conductivity, good heat resistance and low moisture content

Active Publication Date: 2017-01-11
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN 104327451A discloses an aromatic polyester polyol as a toughening agent modified phenolic foam and its preparation method, the invention adds aromatic polyester polyol as an internal toughening agent to modify the phenolic foam in the phenolic resin foaming process The toughness of resin and phenolic foam has been significantly improved, the comprehensive mechanical properties are good, and the foaming rate is easy to control, but the thermal conductivity is high, which limits its application range. At present, there is no modification of cyanate-based phenolic resin in the patent field involved. Based on the various superior properties of cyanate-based phenolic resins, the present invention relates to a cyanate-based phenolic resin-modified expandable phenolic resin foam and its preparation method

Method used

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  • Preparation method of phenolic resin foam modified by cyanate ester resin

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Embodiment 1

[0025] The present invention is a phenolic resin foam modified by cyanate-based resin and a preparation method thereof, comprising the following steps:

[0026] (1) Set the temperature of the water bath at about 60°C, add 100 parts of phenol into a three-necked flask equipped with a thermometer and a magnetic rotor, then add 1 part of sodium hydroxide and stir evenly for about 5 minutes to activate the phenol, and then divide into batches Add 40 parts of paraformaldehyde, control the addition within half an hour, and keep warm for half an hour after all the addition is completed to make the paraformaldehyde fully react. After fully reacting, gradually increase the temperature to 90°C, keep the constant temperature for about one and a half hours, use acetic acid to adjust the pH to 7-8, and cool the synthesized phenolic resin for 24 hours to obtain the basic expandable phenolic resin.

[0027] (2) Add 10 parts of Span and 8 parts of n-pentane to 100 parts of the expandable phen...

Embodiment 2

[0029] The present invention is a phenolic resin foam modified by cyanate-based resin and a preparation method thereof, comprising the following steps:

[0030] (1) Set the temperature of the water bath at about 60°C, add 100 parts of phenol into a three-necked flask equipped with a thermometer and a magnetic rotor, then add 1 part of sodium hydroxide and stir evenly for about 5 minutes to activate the phenol, and then divide into batches Add 50 parts of paraformaldehyde, control the addition within half an hour, and keep warm for half an hour after all the addition is completed to make the paraformaldehyde fully react. After fully reacting, gradually increase the temperature to 90°C, keep the constant temperature for about one and a half hours, use acetic acid to adjust the pH to 7-8, and cool the synthesized phenolic resin for 24 hours to obtain the basic expandable phenolic resin.

[0031] (2) Add 8 parts of Tween-80 and 10 parts of n-pentane to 100 parts of the expandable ...

Embodiment 3

[0033] The present invention is a phenolic resin foam modified by cyanate-based resin and a preparation method thereof, comprising the following steps:

[0034] (1) Set the temperature of the water bath at about 60°C, add 100 parts of phenol into a three-necked flask equipped with a thermometer and a magnetic rotor, then add 1 part of sodium hydroxide and stir evenly for about 5 minutes to activate the phenol, and then divide into batches Add 45 parts of paraformaldehyde, control the addition within half an hour, and keep warm for half an hour after all the addition is completed to make the paraformaldehyde fully react. After fully reacting, gradually increase the temperature to 90°C, keep the constant temperature for about one and a half hours, use acetic acid to adjust the pH to 7-8, and cool the synthesized phenolic resin for 24 hours to obtain the basic expandable phenolic resin.

[0035] (2) Add 10 parts of Tween-80 and 88 parts of n-pentane to 100 parts of the expandable...

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Abstract

The invention relates to a resin foam preparation method, in particular to a preparation method of phenolic resin foam modified by cyanate ester resin. The phenolic resin foam modified by the cyanate ester resin comprises a phenolic compound, an aldehyde compound, a modifying agent, a catalyst, a surfactant and a foaming agent. The preparation method has the advantages that since cyanate-ester thermoplastic phenolic resin which is highly resistant to heat, low in water absorption rate and moisture content, capable of achieving an intrinsic toughening effect, beneficial to increase of percentage of close area and excellent in mechanical property is added into a foaming process of expandable phenolic resin by serving as the modifying agent, the modified phenolic resin foam is of low heat conductivity coefficient, high resistance to heat, high percentage of close area, high dimensional stability and excellent mechanical properties and can be widely applied to the fields of heat insulation and heat preservation of buildings, internal and external fireproof wallboards, central air-conditioning air tube heat preservation materials and aerospace.

Description

technical field [0001] The invention relates to a preparation method of resin foam, in particular to a preparation method of cyanate-based resin-modified phenolic resin foam. Background technique [0002] Phenolic foam is a new type of fire-resistant, fire-resistant and low-smoke thermal insulation material. It is a closed-cell rigid foam made of phenolic resin with flame retardant, smoke suppressant, foaming agent, curing agent and other additives. Its most prominent features are flame retardant, low smoke, and high temperature disparity resistance. Phenolic foam has rich sources of raw materials, low price, simple production and processing, and wide range of products. However, the poor toughness of phenolic foam and the high open cell ratio of the foam limit its application. [0003] Cyanate-based phenolic resin is a phenolic resin derivative formed by novolac resin as the backbone, and the phenolic hydroxyl group is replaced by a cyanate functional group. Under the acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/10C08L61/14C08J9/14
CPCC08J9/141C08J2203/14C08J2361/06C08J2461/14C08L61/06C08L2201/08C08L2203/14C08L61/14
Inventor 葛铁军王成城王佳唐恺鸿徐志华
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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