High-efficiency flame-retardant modified melamino-formaldehyde foams and preparation method thereof

Abstract

The invention discloses high-efficiency flame-retardant modified melamino-formaldehyde foams. The high-efficiency flame-retardant modified melamino-formaldehyde foams are obtained by performing layer-by-layer self assembling through an alternating reaction formed by soaking or spraying of a positive electrolyte aqueous solution and a negative electrolyte aqueous solution based on a layer-by-layer self-assembling technology, and are deposited on the surface of a foam hold skeleton to form multiple layers of stable flame-retardant films, wherein the limit oxygen index is 35.5 to 46.5%; thermogravimetric residual weight at 700 DEG C and under nitrogen atmosphere is 26.7 to 32.8%; under the condition of cone calorimetric test with the power of 50 kW and in the process of from that the foam can be ignited to that the foam cannot be ignited, heat release peak value is 9.8 to 78.8 kW / m<2>; the foam is difficult to shrink at continuous high temperature of 750 DEG C. The flame-retardant films on the obtained melamino-formaldehyde foams have a strong adhesive force, are washable and have high flame-retardant efficiency and excellent flame-retardant performance. The thickness of each of the flame-retardant films is less than 2 microns, so other properties of the foams are not influenced. The high-efficiency flame-retardant modified melamino-formaldehyde foams are simple to prepare, environment-friendly, and easy for industrialized large-scale production.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant modification of melamine-formaldehyde foam, and in particular relates to a high-efficiency flame-retardant modified melamine-formaldehyde foam based on layer-by-layer self-assembly technology and a preparation method thereof. Background technique [0002] Building exterior wall insulation materials are mainly divided into inorganic insulation materials and organic insulation materials. Inorganic insulation materials mainly include: expanded perlite, rock wool, expanded vermiculite, diatomaceous earth, sepiolite powder and foam glass. According to the requirements of the national standard GB 8624-2006, even if the combustion grade of inorganic thermal insulation materials can reach Class A, that is to say, the fire performance is good, but there are problems such as high water absorption, difficult construction, large thermal conductivity, and unsatisfactory thermal insulation effects, whic...

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Problems solved by technology

But on the one hand, because melamine formaldehyde foam is mostly used in public places, road sound insulation, pipeline insulation, and railway shipping, and these places have been in contact with water for a long time, only water-soluble ammonium salts coated on the surface are used to treat the foam. The salt coating is soluble in water, so that the flame retardant coating will be washed off by water in the actual application process, resulting in the failure of the flame retardant modification. On the other hand, because the ammonium salt flame retardant coating is only physically adsorbed on the foam, the adhesion Poor, easy to fall off, so it will also lead to failure of flame retardant modification in the actual application process

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