Preparation method of toughening-modified phenolic resin and phenolic foam

Abstract

The invention provides a preparation method of a toughening-modified phenolic resin and phenolic foam. The preparation method of the phenolic resin comprises the following steps: adding phenol and an alkali catalyst into a reaction kettle, heating to 65-75 DEG C while stirring, and adding a mixture 1, wherein the mol ratio of phenol to alkali catalyst to mixture 1 is 24.6:(0.03-0.09):(16-26.8). The preparation method of the phenolic foam comprises the following step: adding toughener-containing mineral inorganic powder capable of adsorbing and degrading free formaldehyde and free phenol in the resin, a foaming agent, a curing agent and a foam stabilizer into the prepared phenolic resin, thereby obtaining the phenolic foam. The phenolic resin prepared by the method provided by the invention has the advantages of high toughness, favorable flame retardancy, low contents of free formaldehyde and free phenol, and no waste water discharge in the production process. The phenolic resin foam prepared by the method provided by the invention has the advantages of low heat conductivity coefficient, high percentage of close area, favorable toughness, high oxygen index (up to higher than 50), no cracking, no shedding, no dropping, low smoke and no toxicity.

Description

technical field [0001] The invention relates to a preparation method of toughened modified phenolic resin and phenolic foam, and belongs to the technical field of preparation methods of phenolic resin and phenolic foam. Background technique [0002] In the existing process, the use of liquid formaldehyde to produce phenolic resin must adopt a dehydration process. Although the cost is low, it produces a large amount of wastewater containing phenol and aldehyde, which increases the high cost of wastewater treatment in the later stage. If it is discharged without treatment, it will be harmful to the environment and Damage to groundwater resources. Although the use of paraformaldehyde (solid) to produce phenolic resin solves the problem of wastewater discharge, the cost increases by 10%-20%, and a large amount of water needs to be added simultaneously, resulting in waste of water resources. The produced phenolic foam has high thermal conductivity, low closed cell rate, poor tou...

AI Technical Summary

Problems solved by technology

Although the use of paraformaldehyde to produce phenolic resin solves the problem of wastewater discharge, the cost increases, and a large amount of water needs to be added at the same time, resulting in waste of water resources