A kind of composite flame retardant, preparation method and application thereof

Abstract

The invention discloses composite flame retardant. The composite flame retardant comprises polysilicic acid aluminum dihydrogen phosphate solution and nitrogen-phosphorus flame retardant solution, wherein the mass ratio of the nitrogen-phosphorus flame retardant solution to the polysilicic acid aluminum dihydrogen phosphate solution is 100: (20-50). The invention further discloses a preparation method of the composite flame retardant; the preparation method comprises the following steps: the nitrogen-phosphorus flame retardant solution and the polysilicic acid aluminum dihydrogen phosphate solution are separately prepared, and are evenly mixed; the invention further discloses the use of the composite flame retardant; and the use comprises the following steps: the first vacuum dipping treatment and the second normal-temperature and normal-pressure dipping treatment are performed for woods by using the composite flame retardant; and then the drying treatment is performed for the woods. The composite flame retardant can achieve remarkable effects of flame retardance and smoke suppression.

Description

technical field [0001] The invention relates to the field of flame retardant materials, in particular to a composite flame retardant, a preparation method and an application thereof. Background technique [0002] With the continuous reduction of natural forest resources in our country, the continuous increase of fast-growing forests and the implementation of the policy of banning natural forests and restricting the cutting of large-diameter timber issued by the state, the utilization of fast-growing timber is becoming more and more extensive. As a combustible material, timber must be processed Flame retardant treatment can be used for actual production and application. Although traditional halogen-containing flame retardants have superior performance, they have been criticized in terms of environmental protection because they produce a large amount of harmful gases when burned. Inorganic nitrogen-phosphorus flame retardants are widely used because of their advantages such a...

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Problems solved by technology

However, its disadvantage is that it is easy to absorb moisture, has poor weather resistance and stability, and is easy to lose in an environment with high humidity.

[0004] The invention patent application with the application number 201280037362.7 discloses a water-based flame retardant composition comprising phosphoric acid, ammonia, diammonium hydrogen phosphate, ammonium sulfate, urea and a complexing agent. A protective layer and / or foam of a flame retardant, the thermal protection layer prevents the fire from penetrating into the wood, thereby keeping the wood tissue intact, but the raw material of this flame retardant contains ammonium sulfate, which can cause the formation of toxic gases during combustion The output is increased, and the complexing agent only improves the stability of the flame retardant, and does not help the flame retardant and smoke suppression performance of the flame retardant

[0005] The invention patent application with the application number 200910075032.7 discloses a kind of anti-loss and high-efficiency flame-retardant wood, which contains a composite of carbonate or acid carbonate and oxide sol, wherein the oxide sol includes SiO 2 Sol, Al 2 o 3 Sol, SiO 2 / Al 2 o 3 Composite sol or transition metal oxide sol or rare earth oxide sol, the use of inorganic flame retardants and oxide sols together overcomes the shortcomings of poor stability and easy loss of inorganic flame retardants to a certain extent, but due to the large particle size of the sol , the depth of impregnation treatment of wood is not enough, and the flame retardant performance of wood is not improved much

[0006] Silicon and aluminum compounds themselves have flame retardant and smoke suppression properties, but their flame retardant efficiency is not high, and the cost is high, so they are usually not used alone, but as additives to nitrogen and phosphorus flame retardants, added in solid form to improve The performance of flame retardants, but there are also problems of easy moisture absorption and poor stability

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