Melamine formaldehyde resin for foam, preparation method of melamine formaldehyde resin foam

Abstract

The invention discloses preparation methods of melamino-formaldehyde resin for foam and melamino-formaldehyde resin foam, wherein the preparation method of melamino-formaldehyde resin for foam comprises the steps as follows: 1), an organic solvent is taken as a solvent, an amine compound is taken as a catalyst, phosphate compounds and polysiloxane compound are taken as raw reaction materials, a phosphorus containing polysiloxane modifying agent is synthesized under the protection of nitrogen, insoluble salts are filtered and removed after the reaction is finished, and the solvent and unreacted objects are removed through reduced pressure distillation, so that the phosphorus containing polysiloxane modifying agent is obtained; and 2), melamine and a formaldehyde solution are put into a reaction kettle in proportion for reaction, the modifying agent in step 1) is added in a mass proportion after the solution becomes clarified, and after the reaction is performed continuously for 0.5-3 hours, the cooling is performed to obtain a product. With the adoption of the melamino-formaldehyde resin foam produced by the modified melamino-formaldehyde resin prepared by the invention, the problem that the flame retardant property is reduced while the toughness of the toughened and modified melamino-formaldehyde resin foam is improved is effectively solved.

Description

technical field [0001] The invention relates to a preparation method of melamine formaldehyde resin for foam, belonging to the field of polymer materials. [0002] The present invention also relates to a method for preparing melamine-formaldehyde resin foam based on the above-mentioned melamine-formaldehyde resin for foam. Background technique [0003] Melamine foam is a kind of flame retardant foam plastic made by special foaming process based on melamine formaldehyde resin. It has excellent flame retardancy, heat insulation, thermal stability, sound absorption, safety and sanitation and good secondary processability, and can be widely used in construction, machinery, chemical industry, transportation and other fields. [0004] The curing of melamine formaldehyde resin is achieved through cross-linking of methylene or dimethylene ether bonds, because there are triazine rings with a large steric hindrance at both ends of the methylene, and multiple methylene and triazine ri...

AI Technical Summary

Problems solved by technology

[0004]The curing of melamine formaldehyde resin is achieved through cross-linking of methylene or dimethylene ether bonds, because the steric hindrance at both ends of methylene is very large Triazine rings, and multiple methylene groups are interlaced with triazine rings, so the melamine-formaldehyde resin foam prepared by using unmodified melamine-formaldehyde resin has problems such as high brittleness, easy powder drop, and low compressive strength, which limits the Application of melamine formaldehyde resin foam

Patent CN 101735555A improves the flexibility of melamine-formaldehyde resin foam by adding polyols in melamine-formaldehyde resin prepolymer, but because the modifier added increases the combustible components in melamine-formaldehyde resin foam, it will inevitably lead to the failure of melamine-formaldehyde resin foam Decreased flame retardancy

Patent CN 102086270 improves the tear strength and tensile properties of the foam by adding alcohol amine compounds to the melamine formaldehyde resin prepolymer, but does not analyze the flame retardancy of the prepared melamine formaldehyde resin foam