Double-coated microencapsulation expansion flame retardant natural rubber and preparation method thereof
A technology of microencapsulation and natural rubber, applied in microcapsule preparation, microsphere preparation and other directions, can solve the problems of easy agglomeration, material performance decline, flame retardancy of composite materials and limitation of mechanical properties, etc. Excellent flame retardant performance and remarkable intumescent flame retardant effect
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[0026] Example 1:
[0027] Weigh 4.5g of melamine, 7.0g of 37% aqueous formaldehyde solution, 0.5g of sodium carbonate and 35.0mL of distilled water and add them to a 500mL three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, turn on stirring, heat up to 80°C, and keep warm. After 1 h of reaction, 46.2 g of a colorless and transparent aqueous solution of melamine prepolymer was obtained, with a content of about 10%.
[0028] Weigh 40g of APP, 2g of 50% compound dispersant aqueous solution, 100mL of distilled water and 100ml of ethanol into a 500mL beaker, crush and disperse it with an emulsifier for 30min, pour it into a 500mL three-necked flask, and slowly add the above melamine prepolymer under stirring at room temperature. 45 mL of aqueous solution, 1.2 g of boric acid, 5% hydrochloric acid was added dropwise to pH 4-5, then slowly heated to 75 °C for 2 h, the melamine resin was cured on the surface of APP and MCM-41 particles to form a film. A...
Example Embodiment
[0030] Example 2:
[0031] Weigh 4.5g of melamine, 7.0g of 37% aqueous formaldehyde solution, 0.5g of sodium carbonate and 35.0mL of distilled water and add them to a 500mL three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, turn on stirring, heat up to 80°C, and keep warm. After 1 h of reaction, 46.2 g of a colorless and transparent aqueous solution of melamine prepolymer was obtained, with a content of about 10%.
[0032] Weigh 39 g of APP, 1 g of nano-mesoporous molecular sieve MCM-41, 2 g of a 50% aqueous solution of compound dispersant, 100 mL of distilled water and 100 mL of ethanol into a 500 mL beaker, crush and disperse with an emulsifying machine for 30 minutes, and pour it into a 500 mL three-necked flask. Slowly add 45 mL of the above-mentioned melamine prepolymer aqueous solution and 1.2 g of boric acid under stirring, add 5% hydrochloric acid dropwise until the pH is 4-5, then slowly heat to 75 °C, keep the reaction for 2 hours, and th...
Example Embodiment
[0034] Example 3:
[0035] Weigh 4.5g of melamine, 7.0g of 37% aqueous formaldehyde solution, 0.5g of sodium carbonate and 35.0mL of distilled water and add them to a 500mL three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, start stirring, heat up to 80°C, and keep the temperature at 80°C. After 1 h of reaction, 46.2 g of a colorless and transparent aqueous solution of melamine prepolymer was obtained, with a content of about 10%.
[0036] Weigh 30 g of APP, 10 g of nano-mesoporous molecular sieve MCM-41, 2 g of a 50% aqueous solution of compound dispersant, 100 mL of distilled water and 100 mL of ethanol into a 500 mL beaker, crush and disperse with an emulsifying machine for 30 minutes, and pour it into a 500 mL three-necked flask. Slowly add 45 mL of the above-mentioned melamine prepolymer aqueous solution and 1.2 g of boric acid under stirring, add 5% hydrochloric acid dropwise until the pH is 4-5, then slowly heat to 75 °C, keep the reaction...
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