Ammonium polyphosphate/SiO2 composite aerogel flame-retardant reinforced timber and preparation method thereof

Abstract

The invention discloses an ammonium polyphosphate / SiO2 composite aerogel flame-retardant reinforced timber which comprises a timber and an ammonium polyphosphate / SiO2 composite aerogel in timber pores. The invention also discloses a preparation method of the flame-retardant reinforced timber, which comprises the following steps: pretreating the timber with microwaves to form new flow channels in the timber, thereby enhancing the timber permeability; hydrolyzing the previously prepared ammonium polyphosphate and silicon source by pressure dipping treatment, and introducing the generated uniform sol solution into the timber; and carrying out condensation reaction and normal-pressure drying to generate the ammonium polyphosphate / SiO2 composite aerogel in the timber pore structure in situ. The ammonium polyphosphate / SiO2 composite aerogel flame-retardant reinforced timber has favorable flame-retardant and smoke-inhibition functions, and can effectively prevent the flame retardant from loss. The composite aerogel in the timber pores has the effect of enhancing wear resistance and corrosion resistance. The method can be widely used in flame retardancy, reinforcement and corrosion resistance of the solid wood or composite wood, has the advantages of feasible technical process, cheap raw materials and favorable effect, and is worthy of popularization.

Description

technical field [0001] The invention relates to the technical field of improving wood properties such as flame retardancy and reinforcement, specifically a kind of ammonium polyphosphate / SiO produced in situ in wood 2 Composite airgel type flame retardant reinforced wood and its preparation method. Background technique [0002] Wood is widely used and loved in furniture making, interior decoration and construction. However, wood is flammable and can easily start a fire. According to reports, 21% of fires are caused by fibrous materials such as wood, and more than 70% of residential fires are caused by flammable wood materials. Therefore, the research on the flame retardancy of wood has become a topic of common concern. Studies have shown that reducing the flammability of wood and inhibiting the generation of smoke and poisonous gas during the combustion process will help the safe evacuation of people in the fire and can minimize fire losses. [0003] Composite flame retar...

AI Technical Summary

Problems solved by technology

Among them, the use of surface-coated flame-retardant layer not only affects the decoration of wood, but also has limited flame-retardant effect, which cannot meet the requirements of flame-retardant grade.

The problem with the impregnation treatment is that it is difficult to introduce flame retardants into the wood and retain them in the interior of the solid wood for a long time, resulting in short fire-retardant effects and poor effects

This is mainly due to the fact that water-soluble flame retardants are mostly used in wood impregnation flame retardants, so depolymerization reactions will occur in humid environments or under the action of acid and alkali, which will not only migrate and affect decoration, but also easily dissolve in water and lose

In addition, just using a single flame retardant to impregnate the wood is difficult to achieve the required level of flame retardancy. At the same time, a large amount of smoke will be generated, which will easily cause casualties in the fire

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