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

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...

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