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Aluminum phosphate coated silicon dioxide flame retardant and preparation method thereof, and flame-retardant epoxy resin composite material and preparation method thereof

A technology of silica and epoxy resin, which is applied in the field of flame retardant materials, can solve the problems of harsh production conditions of phosphorus-containing monomers, deterioration of dielectric properties and mechanical properties of composite materials, and complex preparation processes.

Pending Publication Date: 2022-05-13
GUIYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For bromine-containing flame retardants, the smoke and toxic gases released after combustion pose a threat to the environment and human health, hindering the use of such flame retardants; and phosphorus-containing flame retardants often contain phosphorus in the development and application process The production conditions of the monomer are relatively harsh, the preparation cost is high, the preparation process is relatively complicated, and the dielectric and mechanical properties of the composite material deteriorate.

Method used

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  • Aluminum phosphate coated silicon dioxide flame retardant and preparation method thereof, and flame-retardant epoxy resin composite material and preparation method thereof
  • Aluminum phosphate coated silicon dioxide flame retardant and preparation method thereof, and flame-retardant epoxy resin composite material and preparation method thereof

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preparation example Construction

[0028] The present invention further provides a method for preparing an aluminum phosphate-coated silica flame retardant described in the above technical scheme, comprising the following steps:

[0029] To provide a silica dispersion solution; the pH of the silica dispersion is 1.5 ~ 2.5;

[0030]Aluminum hydroxide, phosphoric acid and water are mixed, neutralization reaction is carried out to give an aluminum phosphate solution; the mass ratio of aluminum hydroxide and phosphoric acid is 5 ~ 25: 40 ~ 180;

[0031] The silica dispersion and aluminum phosphate solution were mixed to give a mixed solution;

[0032] In the mixed solution drop by drop added alkali solution, co-precipitation, to obtain aluminum phosphate coated silica flame retardant.

[0033] The present invention provides a silica dispersion. In the present invention, the pH of the silica dispersion is preferably 2. In the present invention, the preparation method of the silica dispersion preferably comprises: mixin...

Embodiment 1

[0052] In terms of the number of parts by weight, put 100 parts of dried silica (average particle size of 2 μm) into a beaker, add pure water to give 6wt% of the aqueous silica solution, and add 37wt% of the hydrochloric acid to adjust the pH of the aqueous silica solution of 2 under the stirring state to obtain a silica dispersion solution; 5 parts Al(OH) 3 and 40 servings H 3 PO 4 Added to the beaker, add 20 parts of water for stirring and dissolving, to obtain an aluminum phosphate solution; the aluminum phosphate solution is slowly added to the silica dispersion, reacted at a stirring rate of 120rpm for 30min, and then added ammonia drop by drop (mass concentration of 27%) to adjust the pH of the solution to 5, co-precipitation, the resulting system was vacuum filtered, the resulting solid substance was washed with pure water, dried at 60 ° C, and aluminum phosphate coated with silica flame retardant (SiO) was obtained 2 @AlPO 4 )。

[0053]The aluminum phosphate-coated silica...

Embodiment 2

[0060] In terms of the number of parts by weight, 100 parts of dried silica (average particle size is 2 μm) into a beaker, pure water was added to give 6wt% aqueous silica solution, and 37wt% hydrochloric acid was added to adjust the pH of the aqueous silica solution under the stirring state to obtain a silica dispersion solution; 17 parts Al(OH) was added. 3 and 130 servings H 3 PO 4 Added to the beaker, add 100 parts of pure water for stirring and dissolving, to obtain an aluminum phosphate solution; the aluminum phosphate solution is slowly added to the silica dispersion, reacted at a stirring rate of 120rpm for 30min, and then added ammonia water drop by drop (mass concentration of 27%) to adjust the pH value of the solution to 5, co-precipitation, the resulting system for vacuum filtering, the resulting solid material is washed with pure water, dried at 60 ° C, and aluminum phosphate coated with silica flame retardant is obtained.

[0061] The aluminum phosphate-coated silica...

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Abstract

The invention provides an aluminum phosphate coated silicon dioxide flame retardant and a preparation method thereof, and a flame-retardant epoxy resin composite material and a preparation method thereof, and relates to the technical field of flame-retardant materials. The aluminum phosphate coated silicon dioxide flame retardant provided by the invention comprises silicon dioxide particles and aluminum phosphate nanoparticles attached to the surfaces of the silicon dioxide particles. The aluminum phosphate coated silicon dioxide flame retardant provided by the invention is mixed and cured with epoxy resin, so that the flame retardant property of the epoxy resin composite material can be obviously improved; compared with a bromine-containing flame retardant and a phosphorus-containing flame retardant, the aluminum phosphate coated silicon dioxide flame retardant provided by the invention is safer and more environment-friendly, lower in preparation cost and simple in preparation process, and can avoid adverse effects on the mechanical properties of epoxy resin.

Description

Technical field [0001] The present invention relates to the technical field of flame retardant materials, specifically to a kind of aluminum phosphate coated silica flame retardant and preparation method thereof, flame retardant epoxy resin composite material and preparation method thereof. Background [0002] Epoxy resin is widely used in electrical equipment, aerospace and other fields. However, because epoxy resins are extremely flammable, there is a potential fire hazard. Therefore, it is of great significance to develop epoxy resin composites with excellent flame retardant properties. [0003] At present, the preparation of flame retardant epoxy resin composites mainly involves the following two aspects: (1) Mixing additive flame retardants in the curing molding process. (2) Introduce functional groups containing flame-retardant elements (such as bromine and phosphorus) into the molecular structure of epoxy resin. For bromine-containing flame retardants, the smoke and toxic...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K9/12C08K3/36C08K3/32C08L63/00
CPCC08K9/10C08K9/12C08K3/36C08K3/32C08L2201/02C08K2201/011C08K2003/327C08K2201/005C08L63/00
Inventor 王奎严伟黄伟江田琴杨春林涂春云
Owner GUIYANG UNIV
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