Organic bentonite for composite flame retardants and preparation process thereof

Abstract

The invention provides a preparation process for an organic bentonite for composite flame retardants, which adopts sodium bentonite as a raw material to be mixed with composite organic cation surfactant. The preparation process is characterized in that: 3 to 4 parts of sodium hexametaphosphate is added into 300 to 500 parts of deionized water, 30 to 50 parts of sodium bentonite is then added, and after high-speed agitation, bentonite suspension solution is produced; 12 to 20 parts of composite organic cation surfactant is added into 120 to 200 parts of solvent, and after high-speed agitation, composite organic cation surface modifier solution is produced; under the state of high-speed agitation, the composite organic cation surface modifier solution is added into the bentonite suspension solution, ammonia is used for regulating the pH of the mixed solution to be 8 to 9, agitation is carried out under thermostatic waterbath of 75 DEG C to 85 DEG C for 2 hours, centrifugal separation is carried out after the temperature is cooled to the room temperature, and after vacuum drying under 80 DEG C to 90 DEG C and grinding, the organic bentonite for the composite flame retardants is prepared. The organic bentonite obtained by the method has good lipophilicity and a good flame-retardant effect, and can be applied in the modification of paint, ink and plastic, and while the dosage of other flame retardants is reduced and the cost is saved, the flame-retardant property and mechanical property of polymer can be enhanced as well.

Description

Technical field [0001] The invention belongs to the technical field of fine processing of bentonite, and specifically relates to a preparation method of organic bentonite for composite flame retardants. Background technique [0002] Bentonite is a non-metallic mineral with montmorillonite as the main component. The crystalline structure of montmorillonite is a 2:1 layered structure of two silicon-oxygen tetrahedrons and a layer of aluminum-oxygen octahedron, which has good expansibility. , Adsorption, adhesion, catalysis, thixotropy, suspension, cation exchange and large internal and external specific surface area, known as "universal" clay. my country is rich in bentonite resources, second only to the United States, ranking second in the world. Organobentonite is a deep processed product of bentonite. Due to its hydrophobic and lipophilic properties, it has good dispersibility, solubilization and emulsification in organic solvents, so it is widely used in plastics, paints, inks...

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Problems solved by technology

[0003] Existing at present about the report of organic bentonite preparation technology, as: 1, the patent No. is 00101420.X " production method of organic bentonite " adopts extrusion modification method, octadecyl quaternary ammonium salt is mixed with solvent, then adds into the material, extruded in a self-heating extruder to obtain organic bentonite, which has low investment, high efficiency, and is suitable for large-scale production. The disadvantage is that the organic matter content in the obtained organic bentonite is low, and the lipophilic effect is poor It is suitable for the application in the modification of polymer materials; 2. The patent No. 200710188484.7 "Preparation method of secondary intercalation organic bentonite" uses nickel nitrate, cobalt nitrate and other transition metal salts to treat sodium-based bentonite to form a transition metal ion intercalation layer, and then use hexadecyl trimethyl ammonium bromide to carry out secondary organic intercalation to form secondary organic intercalation. The advantage is that the obtained bentonite has a high degree of organicization. The disadvantage is that the preparation process is complicated, the cost is high, and it is not suitable for large-scale production. , and the flame retardant effect is not obvious in the modification of polymer materials; 3. Liu Zhe of Shenyang University of Technology and others used polyacrylamide and octadecyldimethylbenzyl ammonium chloride as modifiers to synthesize binary modified Organic bentonite, the obtained organic bentonite has better lipophilicity, but because the modifiers are all flammable organic substances, its flame retardancy is not significantly improved compared with inorganic bentonite

[0004] Organic bentonite is applied to high polymers, which can be compounded on the nanostructure to enhance the mechanical properties and barrier properties of high polymers. However, due to the better combustion performance of organic bentonite modifiers, the flame retardancy of organic bentonite The flame retardant properties of organic bentonite can not be significantly improved after being applied in polymers.

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