Polyamide modified melamine-formaldehyde prepolycondensate and foam material, and preparation methods thereof

Abstract

The invention provides a polyamide modified melamine-formaldehyde prepolycondensate, and belongs to the technical field of melamine-formaldehyde foam materials. The prepolycondensate is prepared through a method comprising the following steps: adjusting the pH value of a paraformaldehyde solution, heating the paraformaldehyde solution, adding melamine, polyamide and a modifier, performing a cloudpoint monitoring reaction progress, and performing heating stopping and rapid cooling after a corresponding cloud point is reached. The invention also provides a polyamide modified melamine-formaldehyde foam material. The foam material comprises 100 parts of the polyamide modified melamine-formaldehyde prepolycondensate, 0.5-10 parts of a surfactant, 2-15 parts of a catalyst, 2-20 parts of a foaming agent, 0-5 parts of an assistant and 0-30 parts of water. A melamine-formaldehyde foam material is modified with polyamide, so the flame retardancy and the thermal stability of the material are kept, and the tear toughness of the melamine-formaldehyde foam is improved. Modification of the melamine-formaldehyde resin polycondensate with polyamide can improve the fluidity of the melamine-formaldehyde resin prepolycondensate and reduce the difficulty of industrial production.

Description

technical field [0001] The invention belongs to the technical field of melamine-formaldehyde foam materials, in particular to a polyamide-modified melamine-formaldehyde precondensation polymer, a foam material and a preparation method. Background technique [0002] Melamine-formaldehyde foam, also known as melamine formaldehyde foam, is a low-density, high-porosity foam plastic with melamine-formaldehyde resin as the main raw material. It has excellent flame retardant, sound absorption, thermal insulation, non-toxic, high temperature resistance. , health and safety, light weight and good secondary processing performance, is a new material that is safe, environmentally friendly and energy-saving. The most important property of melamine-formaldehyde foam is that it is flame-retardant on the body, which can completely eliminate the fire safety hazard of traditional foam plastics. Melamine-formaldehyde foam is widely used in construction, vehicles, ships, aviation, mechanical a...

AI Technical Summary

Problems solved by technology

Although this method can to a certain extent solve the problem that the toughness of the modified melamine formaldehyde resin foam is reduced while the toughness is improved, the preparation process of the modifier is complicated and the post-treatment process is cumbersome, which is not conducive to large-scale production.

[0006] CN 101735555A discloses "highly flexible melamine-formaldehyde foam material and its preparation method". The method is to modify the melamine-formaldehyde foam by polyvinyl alcohol (PVA) and other substances, which has achieved certain effects, but its preparation process is complicated , The production cost is high, and because the added modifier increases the combustible components in the melamine-formaldehyde foam, it will inevitably lead to a decrease in the flame retardancy of the melamine foam

Patent CN104277416A discloses that polyvinyl acetal modified melamine resin, surfactant, foaming agent and curing agent are mixed and stirred before foaming, which reduces the slag drop rate of foamed plastics and improves the flexibility of foamed plastics. However, the addition of polyvinyl acetal will reduce the thermal stability and flame retardancy of the foam

[0007] Although these technologies have solved some problems in a certain aspect, the prepared melamine foam still has problems such as poor mechanical properties, especially poor tear resistance, brittleness, powder drop, and complicated preparation process.

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