A kind of production method of normal temperature fluorine-free foaming neutral phenolic foam

Abstract

The invention relates to a method for producing normal temperature CFC (Chloro Flouro Carbon)-free neutral phenolic froth-foam, which adopts the following raw materials and comprises the following steps of: (1) preparing phenol, industrial paraformaldehyde, oxalic acid, hydrochloric acid and water; (2) performing a heat preservation reaction; (3) preparing phenol, industrial paraformaldehyde, sodium hydroxide, urea and water; (4) adding the raw materials in the step (3) into a reaction kettle to heat; (5) dehydrating; (6) adding the raw materials in the step (2) into a stirring tank; (7) adding the raw materials in the step (5) into the stirring tank; and (8) adding a curing agent and pouring the mixture into a die to carry out normal temperature foaming to obtain the product. In the method, a CFC-free foaming agent is adopted, so that the ozone layer cannot be damaged; and the acidity-alkalinity of a foam body is neutral, so the product has no corrosivity and has better anti-breakingcapacity, longer service life and wider application range.

Description

technical field [0001] The invention belongs to the technical field of macromolecular organic compounds, and in particular relates to a production method of fluorine-free foaming neutral phenolic foam at normal temperature. Background technique [0002] Phenolic foam is a new type of non-combustible fireproof insulation material with low raw material price and simple production process. In recent years, this material has been used more and more in central air-conditioning ducts, wall insulation, petrochemical pipeline insulation, aerospace equipment, etc., and its application range has become wider and wider. This kind of phenolic foam material is generally formed by foaming thermosetting phenolic resin. Its defect is that when the phenolic resin is foamed, it needs to be kept warm at about 70°C, which is difficult to implement on site; secondly, the curing agent added when the phenolic resin is foamed is organic acid or Inorganic acid has strong acidity. Once mixed with wa...

AI Technical Summary

Problems solved by technology

This kind of phenolic foam material is generally formed by foaming thermosetting phenolic resin. Its defect is that when the phenolic resin is foamed, it needs to be kept warm at about 70°C, which is difficult to implement on site; secondly, the curing agent added when the phenolic resin is foamed is organic acid or Inorganic acid has strong acidity. Once mixed with water or water vapor, it will pollute the environment, corrode metals, and leave potential safety hazards; third, the traditional technology uses fluorine-containing foaming agents for foaming, which are harmful to the ozone layer. It has a destructive effect; fourth, the molecular rigidity of phenolic resin is large, which often leads to the brittleness of the generated phenolic foam and the low strength, which needs to be toughened and modified

However, ordinary toughening methods will lead to a decrease in the fire resistance of phenolic resins, or lead to poor compatibility of resins and difficult processing.

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