Preparation method of hydrophobic tannin modified polyphosphazene nano-material and application of hydrophobic tannin modified polyphosphazene nano-material in fireproof flame-retardant coating

Abstract

The invention belongs to the technical field of coatings and discloses a preparation method of a hydrophobic tannin modified polyphosphazene nano-material and application of the hydrophobic tannin modified polyphosphazene nano-material in a fireproof flame-retardant coating. The preparation method of the polyphosphazene nano-material comprises the following steps of: (1) preparing the polyphosphazene nano-material by a precipitation polymerization method: adding phosphonitrilic chloride trimer and vegetable tannin into acetonitrile, carrying out ultrasonic treatment, adding trimethylamine, carrying out ultrasonic treatment, carrying out centrifuging, cleaning precipitates, and drying the precipitates to obtain a product; and (2) carrying outsuper-hydrophobic modification: putting the obtained product into a metal salt solution, performing stirring, filtering and drying, putting an obtained product into an alcoholic solution of a long-chain mercaptan compound, performing stirring and filtering, washing anobtained product with alcohol, and drying the product to obtain the hydrophobic tannin modified polyphosphazene nano material. The polyphosphazene nano material is obtained by tannin modification through the precipitation polymerization method; the smoke suppression performance of the material is improved by utilizing the performance that tannin can be complexed with metal ions;and hydrophobic modification is performed on the material by adopting the long-chain alkyl compound, so that the water resistance of the material is improved.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a method for preparing a hydrophobic tannin-modified polyphosphazene nanometer material and its application in fire-resistant and flame-retardant coatings. Background technique [0002] Phosphorus and nitrogen elements in polyphosphazene molecules are both flame retardant elements. As a new organic and inorganic polymer material, the abundant phosphorus and nitrogen atoms in the main chain endow it with excellent halogen-free flame retardant properties. Adding it to the substrate will Reduce the heat release rate and smoke release, and the N produced during the combustion degradation process 2 , NH 3 Such as flame retardant, low toxicity, non-corrosive gas can reduce the concentration of flammable gas. In addition, the adjustable type and ratio of polyphosphazene molecular side groups make this polymer material have various other characteristics. In practical applications, peo...

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Problems solved by technology

[0003] Usually, the flame retardant content in the fireproof coating is high, the water resistance is poor, and the water resistance of the filler is also poor. The coating is easy to absorb water and makes the fireproof coating soft. The purpose of the present invention is to overcome the defect of poor water resistance of the fireproof coating and provide a Hydrophobic tannins modify polyphosphazene nanomaterials. The polyphosphazene nanomaterials are obtained by tannin modification by precipitation polymerization. The ability of tannins to complex with metal ions improves the smoke suppression of the material, further Use long-chain alkyl compounds to modify the material hydrophobically, which improves the water resistance of the material and can be used in water-based fireproof coatings