A hydrophobic sio 2 Coated halogen-free intumescent flame retardant and its preparation method and application

Abstract

The invention discloses a hydrophobic SiO 2 Coated halogen-free intumescent flame retardant and its preparation method and application. The preparation method comprises: (1) obtaining a halogen-free intumescent flame retardant with a positive charge on the surface; (2) obtaining a nano-SiO with a negative charge on the surface 2 Collagen solution; (3) to obtain SiO 2 Coated halogen-free intumescent flame retardant; (4) obtain hydrophobic SiO 2 Encapsulated halogen-free intumescent flame retardant. The invention provides a simple preparation method of a hydrophobic halogen-free intumescent flame retardant, which can be carried out step by step, has strong operability, is beneficial to industrial production, and can effectively avoid the reaction of the halogen-free intumescent flame retardant in water-containing Existing in the system for a long time causes the problem of flame retardant dissolution loss.

Description

technical field [0001] The invention belongs to the technical field of flame retardants, and more specifically relates to a hydrophobic SiO 2 Coated halogen-free intumescent flame retardant and its preparation method and application. Background technique [0002] Typical representatives of intumescent halogen-free flame retardants are ammonium polyphosphate, melamine phosphate, melamine, etc., which have excellent properties such as low smoke, low toxicity, and high-efficiency flame retardancy, and are widely used in polymer resin materials. However, these expandable halogen-free flame retardants are all inorganic materials, which have poor compatibility with polymer resin materials. In addition, ammonium polyphosphate, melamine phosphate, and melamine have different degrees of solubility in water, are easy to hydrolyze, and have moisture absorption and migration. Penetration and other disadvantages greatly reduce its application field. [0003] Common modification methods...

AI Technical Summary

Problems solved by technology

Chinese patent CN101760049B discloses a preparation method of core-shell silica-coated ammonium polyphosphate, dispersing ammonium polyphosphate in an aqueous solution with a mass percentage of ethanol of 10-30%, adjusting the pH value, and then adding silicic acid dropwise Ester / ethanol solution, after fully reacting, add titanate coupling agent and borate coupling agent to the slurry for surface treatment to obtain silicon dioxide-coated ammonium polyphosphate, the ethanol aqueous solution used in this patent The proportion is very high, accounting for about 70-90%, and it takes a long time for the hydrolysis of ethyl orthosilicate. Ammonium polyphosphate always exists in the reaction system, and there will be a lot of dissolved in water, which will cause losses, and increase the difficulty of waste liquid separation and treatment.

In addition, the patent states that if the ethanol concentration is too high, coating will not occur, indicating that the patent cannot solve the problem of loss of ammonium polyphosphate due to dissolution in water by adjusting the amount of water

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