Polyamide-modified melamine-formaldehyde precondensate, foam material and preparation method

Abstract

The invention provides a polyamide-modified melamine-formaldehyde precondensate, which belongs to the technical field of melamine-formaldehyde foam materials. The precondensed polymer is prepared by adjusting the pH value of the paraformaldehyde solution and then adding melamine, polyamide and modifier, monitoring the reaction process at the cloud point, stopping heating and cooling down rapidly after reaching the corresponding cloud point. The present invention also provides a polyamide-modified melamine-formaldehyde foam material, comprising 100 parts of polyamide-modified melamine-formaldehyde precondensate, 0.5-10 parts of surfactant, 2-15 parts of catalyst, and foaming 2-20 parts of agent, 0-5 parts of auxiliary agent and 0-30 parts of water. The invention uses polyamide to modify the melamine-formaldehyde foam material, which not only maintains the flame retardancy and thermal stability of the material, but also improves the tear toughness of the melamine-formaldehyde foam. The modification of the melamine-formaldehyde resin polycondensate by polyamide can improve the fluidity of the melamine-formaldehyde resin precondensate 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 precondensate, 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 retardancy, sound absorption, thermal insulation, non-toxic, and high temperature resistance. , health and safety, light weight and good secondary processing performance, it is a new material that is safe, environmentally friendly and energy-saving. The most important property of melamine-formaldehyde foam is its bulk flame retardancy, which can completely eliminate the fire safety hazards of traditional foam plastics. Melamine-formaldehyde foam is widely used in the fields of construction, vehicles, ships, aviation, electromecha...

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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