A kind of preparation method of closed cell agent and obtained product

Abstract

The invention provides a method for preparing a hole closing agent. The method includes the steps that 1, phthalic anhydride is added into toluene diisocynate, and stirring is carried out for reacting at the normal temperature, wherein the volumetric-mass ratio of the phthalic anhydride to the toluene diisocynate is 100 ml:4-8g; 2, polyethylene glycol 200 is added into the reaction system, the reaction temperature ranges from 65 DEG C to 75 DEG C, the temperature is kept 65-75 DEG C after the polyethylene glycol is added, the reaction is continuously carried out for 30-40 minutes, and the hole closing agent is obtained. According to the method, the phthalic anhydride and an assistant are added when the hole closing agent is prepared, and the hole opening problem of melamine foam is solved through active polyurethane. By means of the prepared hole closing agent, the hole opening rate of a melamine sponge can be effectively decreased, the toughness of the sponge is improved, product quality is improved, and the application range is expanded.

Description

technical field [0001] The invention belongs to the field of porous materials, and in particular relates to a cell-closing agent used for preparing foam resin. Background technique [0002] In recent years, melamine sponge, also known as melamine sponge, is a soft thermosetting foam with a nano-scale three-dimensional network cross-linked structure made of alkaline melamine formaldehyde resin through a special process of microwave foaming. Melamine sponge is a completely open-cell foam with an open cell rate of 99.9%, high flame retardant performance and low smoke density. It is a good thermal insulation, heat insulation, sound insulation, and lightweight material. It is widely used in the fields of architectural decoration, transportation vehicles, water ships, aerospace, electromechanical equipment, industrial sound-absorbing and thermal insulation (Wang Dongwei et al., Preparation, modification and performance research of melamine foam, Functional Materials, 2012, No. 24)...

AI Technical Summary

Problems solved by technology

The open-cell structure of melamine sponge foam has a high water absorption rate of 350%. After absorbing water, the weight of the foam increases, and the thermal insulation and sound insulation performance drops sharply. It is easier to breed bacteria in the cavity and cause mildew. Limited thermal insulation performance, limited application in thermal insulation

[0004] There is currently no cell-closing agent specifically for melamine sponges on the market