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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Embodiment 1
[0027] Weigh 4.5g of melamine, 7.0g of 37% formaldehyde solution, 0.5g of sodium carbonate and 35.0mL of distilled water into a 500mL three-neck flask equipped with a stirrer, thermometer and reflux condenser, start stirring, raise the temperature to 80°C, and keep warm After 1 hour of reaction, 46.2 g of a colorless and transparent melamine prepolymer aqueous solution 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, pulverize and disperse with an emulsifier for 30min, then pour into a 500mL three-necked flask, slowly add the above-mentioned melamine prepolymerization under stirring at room temperature 45mL aqueous solution, 1.2g boric acid, 5% hydrochloric acid was added dropwise until the pH was 4-5, then slowly heated to 75°C, and kept for 2 hours, the melamine resin solidified and formed a film on the surface of APP and MCM-41 particles. A...
Embodiment 2
[0031] Weigh 4.5g of melamine, 7.0g of 37% formaldehyde solution, 0.5g of sodium carbonate and 35.0mL of distilled water into a 500mL three-neck flask equipped with a stirrer, thermometer and reflux condenser, start stirring, raise the temperature to 80°C, and keep warm After 1 hour of reaction, 46.2 g of a colorless and transparent melamine prepolymer aqueous solution was obtained, with a content of about 10%.
[0032] Weigh 39g of APP, 1g of nano-mesoporous molecular sieve MCM-41, 2g of 50% compound dispersant aqueous solution, 100mL of distilled water and 100ml of ethanol into a 500mL beaker, pulverize and disperse with an emulsifier for 30min, then pour it into a 500mL three-necked flask, and store at room temperature Slowly add 45mL of the above-mentioned melamine prepolymer aqueous solution and 1.2g of boric acid under stirring, add dropwise 5% hydrochloric acid until the pH is 4-5, then slowly heat to 75°C, keep the temperature for 2 hours, and the melamine resin is in APP...
Embodiment 3
[0035] Weigh 4.5g of melamine, 7.0g of 37% formaldehyde solution, 0.5g of sodium carbonate and 35.0mL of distilled water into a 500mL three-neck flask equipped with a stirrer, thermometer and reflux condenser, start stirring, raise the temperature to 80°C, and keep warm After reacting for 1 hour, 46.2 g of a colorless and transparent melamine prepolymer aqueous solution with a content of about 10% was obtained.
[0036] Weigh 30g of APP, 10g of nano-mesoporous molecular sieve MCM-41, 2g of 50% compound dispersant aqueous solution, 100mL of distilled water and 100ml of ethanol into a 500mL beaker, pulverize and disperse with an emulsifier for 30min, then pour into a 500mL three-necked flask at room temperature Slowly add 45mL of the above-mentioned melamine prepolymer aqueous solution and 1.2g of boric acid under stirring, add dropwise 5% hydrochloric acid until the pH is 4-5, then slowly heat to 75°C, keep the temperature for 2 hours, and the melamine resin is in APP and MCM-41...
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