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Modified phenolic resin, preparation method and refractory material containing modified phenolic resin

A technology of phenolic resin and refractory material, applied in the field of modified phenolic resin and its preparation, and refractory material, can solve the problems of improving heat resistance, improve the bonding strength, and reduce the amount of formaldehyde. Effect

Inactive Publication Date: 2020-05-01
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon residue of the phenol-based phenolic resin commonly used at present is about 60%, and the heat resistance needs to be improved.

Method used

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  • Modified phenolic resin, preparation method and refractory material containing modified phenolic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Add 30g of papermaking waste, 70g of phenol, and 2g of oxalic acid catalyst into the reactor;

[0029] 2) Raise the temperature to 60°C and add 50g of formaldehyde dropwise to the reaction kettle, and keep warm at 90°C for 3h after adding;

[0030] 3) Vacuum dehydration is carried out under reduced pressure of 0.09MPa, the vacuum is released when the temperature is 100°C, and the reaction is stirred for 3 hours;

[0031] 4) Carry out dehydration under reduced pressure again to obtain a modified phenolic resin for refractory materials.

[0032] 5) Prepare a refractory material using the obtained phenolic resin.

[0033] The refractory preparation steps are as follows:

[0034] Mix 40 parts of magnesia-calcium sand and 20 parts of alumina first to obtain a premix, add the premix and 3 parts of papermaking waste modified phenolic resin obtained in Example 1 and mix for 5 minutes, then add 7 parts of carbon Mix the raw material for 30 minutes to obtain the mixed mater...

Embodiment 2

[0036] 1) Add 40g of papermaking waste, 60g of phenol, and 4g of hydrochloric acid catalyst into the reactor;

[0037] 2) Raise the temperature to 70°C and add 50g of formaldehyde dropwise to the reactor, and keep warm at 100°C for 4 hours after adding;

[0038] 3) Vacuum dehydration is carried out under reduced pressure of 0.09MPa, the vacuum is released when the temperature is 110°C, and the reaction is stirred for 2 hours;

[0039] 4) Carry out dehydration under reduced pressure again to obtain the phenolic resin for refractory materials.

[0040] 5) Prepare a refractory material using the obtained phenolic resin.

[0041] The refractory preparation steps are as follows:

[0042] Mix 50 parts of magnesia-calcium sand and 30 parts of alumina first to obtain a premix, add the premix and 6 parts of papermaking waste modified phenolic resin obtained in Example 2 to the mixer and mix for 5 minutes, then add 15 parts of carbon Mix the raw material for 30 minutes to obtain the ...

Embodiment 3

[0044] 1) Add 50g of papermaking waste, 50g of phenol, and 7g of phosphoric acid catalyst into the reactor;

[0045] 2) Raise the temperature to 85°C and add 50g of formaldehyde dropwise to the reactor, and keep warm at 120°C for 2 hours after adding;

[0046] 3) Vacuum dehydration is carried out under reduced pressure of 0.09MPa, the vacuum is released when the temperature is 130°C, and the reaction is stirred for 1 hour;

[0047] 4) Carry out dehydration under reduced pressure again to obtain the phenolic resin for refractory materials.

[0048] 5) Prepare a refractory material using the obtained phenolic resin.

[0049] The refractory preparation steps are as follows:

[0050] Mix 75 parts of magnesia-calcium sand and 50 parts of alumina first to obtain a premix, add the premix and 9 parts of papermaking waste modified phenolic resin obtained in Example 3 and mix for 5 minutes, then add 18 parts of carbon Mix the raw material for 30 minutes to obtain the mixed material, ...

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Abstract

The invention discloses a preparation method for modified phenolic resin used for a refractory material. The preparation method comprises the following steps: adding papermaking wastes, phenol and anacid catalyst into a reaction kettle, and carrying out blending; carrying out heating, then dropwise adding aldehyde into the reaction kettle, and after the aldehyde is added, carrying out full reaction; carrying out dehydrating in vacuum, releasing the vacuum when a temperature is 100-130 DEG C, and continuing the reaction; and carrying out dehydrating again under reduced pressure so as to obtainthe phenolic resin used for the refractory material. The invention further provides the refractory material. The refractory material comprises the following components in parts by weight: 40-75 partsof magnesia-calcium sand, 20-50 parts of aluminum oxide, 7-18 parts of carbon and 3-9 parts of the modified phenolic resin. The modified phenolic resin provided by the invention has the following advantages: the papermaking wastes are adopted for chemically modifying the phenolic resin, so the heat resistance of the resin is effectively improved; meanwhile, the carbon residue rate and the bondingstrength of the resin are improved; and the high-temperature strength of the prepared refractory material is higher than the high-temperature strength of conventional phenolic resin.

Description

technical field [0001] The invention relates to the technical field of phenolic resin application, in particular to a modified phenolic resin, a preparation method thereof, and a refractory material containing the modified phenolic resin. Background technique [0002] Phenolic resin is the earliest industrially produced synthetic resin in the world. Its excellent flame retardancy, electrical properties and insulation properties are widely used in composite materials, coatings, foam materials, adhesives, inks and other fields. In addition, phenolic resin is used in a very large amount in refractory binders, especially because of its high carbon residue rate and temperature resistance. [0003] As a binder for refractory materials, it is required that the resin has high temperature resistance and thermal stability, and has a high residual carbon rate after carbonization, so as to ensure the strength of the material at high temperature. However, the carbon residue of the pheno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C04B35/66
CPCC08G8/28C04B35/66C04B2235/3208C04B2235/3206C04B2235/3217C04B2235/422C04B2235/96C04B2235/77
Inventor 施晓旦孙海强郑璐
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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