Phenol-formaldehyde resin modified, preparation method, and application in preparing pheol formaldehyde foam

A technology of phenolic resin and manufacturing method, which is applied in the application field of modified phenolic resin to prepare non-corrosion phenolic foam, which can solve the problems of foam performance becoming brittle, easy to corrode metal, and affecting use, and achieve no global greenhouse effect coefficient , good strength effect

Inactive Publication Date: 2005-01-12
厦门高特高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No. US4122045 patent uses borax to prepare non-corrosion phenolic foam plastics, but the foam performance becomes brittle and affects the use
There are many technologies related to the modification of phenolic resins, but basically they must be foamed and solidified under strong acid conditions. The pH value of the resulting phenolic foam plastics is 1.0 to 3.5, and they are easy to corrode metals when they absorb moisture during use. There have been many cases at home and abroad. example

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix 100 g of phenol, 100 g of formaldehyde, and 2 g of sodium hydroxide. After reacting at 80°C for 50 minutes, add 20 g of alumina, increase the temperature to 90°C, and react for 30 minutes, then add 10 g of urea, and continue to react at 90°C for 80 minutes; lower the temperature to 60°C, Add acid to neutralize to pH 6, dehydration to obtain modified phenolic resin, the viscosity is controlled at 10000cp / 25℃, and the solid content is 80%.

Embodiment 2

[0022] Mix 100g of phenol, 120g of formaldehyde, and 3g of potassium hydroxide. After reacting at 70°C for 40min, add 10g of aluminum hydroxide, heat to 85°C, react for 25min, add 2g of urea, and continue to react at 95°C for 100min; cool to 65°C , Add acid to neutralize to pH 7, dehydration to obtain modified phenolic resin, viscosity is controlled at 15000cp / 25℃, solid content is 85%.

Embodiment 3

[0024] Mix 100g of phenol, 150g of formaldehyde, and 2.5g of triethylamine. After reacting at 85°C for 45min, add 25g of calcium oxide, heat to 100°C, react for 15min, add 6g of dicyandiamide, and continue to react at 100°C for 20min; cool to At 70°C, add acid to neutralize to pH 6.5, dehydration to obtain modified phenolic resin, the viscosity is controlled at 20000cp / 25°C, and the solid content is 90%.

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PUM

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Abstract

The invention relates to a modified phenol-formaldehyde resin, its preparation method and application in preparation of non-corrosive phenolic foam. Its composition includes phenol, formaldehyde, basic catalyst, inorganic powder and solidification adjuvant, and its preparation method includes the following steps: firstly, mixing phenol, formaldehyde and basic catalyst, then adding inorganic powder, heating to make reaction, and adding solidification adjuvant, continuously reacting, cooling, adding acid to make neutralization and dehydrating; then mixing the modified phenol-formaldehyde resin, surfactant and foaming agent, the adding solidifying agent and baking so as to obtain the invented non-corrosive phenolic foam plastics. Its modification method is simple, the phenol-formaldehyde resin which can be foamed under the condition of weak acid can be obtained, finally the non-corrosive henolic foam plastics can be obtained, said resin can be well foamed, solidified when its pH is 4.0-6.0, and can be made into compact non-corrosive phenolic foam with good strength. It can use paraffins as foaming agent.

Description

Technical field [0001] The invention relates to a phenolic resin, especially a modified phenolic resin and its application in the preparation of non-corrosive phenolic foam. Background technique [0002] Phenolic foam produced with phenolic resin has the characteristics of low thermal conductivity, non-combustibility, low smoke toxicity and low value. Phenolic foam has a history of many years, and it is the best fireproof among thermal insulation foams. Despite these advantages, phenolic foam has not been widely used in the insulation market. The main reason is that people have cured phenolic foam under acidic conditions for a long time, and the residual acid will cause metal corrosion in the application. In addition, brittleness is also a serious problem of phenolic foam. In the 1980s, the phenolic foam color steel plate was a very popular building material in the United States. Later, it was discovered that the steel plate would be corroded and gradually withdrew from the marke...

Claims

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Application Information

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IPC IPC(8): C08G8/28C08J9/04
Inventor 汪坤明张均明杨成根林志祥
Owner 厦门高特高新材料有限公司
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