Resin solution for preparing melamine formaldehyde resin foam plastics and preparation method thereof

Abstract

The invention discloses resin solution for preparing melamine formaldehyde resin foam plastics and a preparation method thereof. The preparation method for melamine formaldehyde resin solution comprises the following steps: adding weak-acid-strong-alkali salts into the resin solution, and evenly mixing to prepare the melamine formaldehyde resin solution, wherein the resin solution is a reaction product of melamine and formaldehyde. The melamine formaldehyde resin solution has good storage stability, and has shelf life of above 72 hours when preparing the melamine formaldehyde resin foam plastics so as to greatly facilitate preparing the melamine formaldehyde resin foam plastics. Experiments show that the melamine formaldehyde resin flexible foam plastics prepared from the melamine formaldehyde resin solution have good mechanical property, physiochemical performance and flame resistance.

Description

technical field [0001] The invention relates to a resin solution for preparing melamine-formaldehyde resin foam plastics. Background technique [0002] Melamine foam plastic is a new type of foam plastic with high opening rate and three-dimensional network structure. It has excellent sound absorption performance, flame retardant performance, heat insulation performance, moisture and heat resistance stability, safety and sanitation and secondary processing performance. [0003] Foams made from melamine-formaldehyde resins have better heat resistance, flame retardancy, and insulation than polystyrene and polyurethane foams. Melamine-formaldehyde resin foam can be used as flame-retardant and sound-absorbing materials for buildings and vehicles, and has the functions of light weight, convenient operation, flame-retardant and noise reduction. [0004] To prepare melamine-formaldehyde foamed plastics, melamine-formaldehyde resin (MF resin for short) must first be prepared. At pre...

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Problems solved by technology

[0004] To prepare melamine-formaldehyde foamed plastics, melamine-formaldehyde resin (MF resin for short) must first be prepared. At present, the chemical composition of MF resin used to prepare melamine-formaldehyde foamed plastics is polymethylolmelamine, because polymethylolmelamine has reactivity , It is easy to further react and gel during storage. Therefore, when melamine formaldehyde resin is used to prepare foamed plastics, the resin has a short service life, usually only 4-5 hours, which brings great inconvenience to production.

[0005] Although the aqueous solution of melamine-formaldehyde resin can be spray-dried to make powdered MF resin, which can solve the storage problem of MF resin, but when preparing melamine-formaldehyde foamed plastics, it is still necessary to dissolve the powdery MF resin into a solution, because MF There are inevitably a small amount of gel particles in the powder. During the dissolution process, these gel particles cannot be dissolved again, but are dispersed in the MF aqueous solution. In the process of preparing foam plastics, once these particles cannot be removed, these undissolved Particles in the foam will cause local breakage of the foam, or even collapse of the foam