Double-coated microencapsulation expansion flame retardant natural rubber and preparation method thereof

Abstract

The invention discloses double-coated microencapsulation expansion flame retardant natural rubber and a preparation method thereof and relates to rubber and a preparation method thereof. The method comprises the following steps of: sequentially mixing a rubber matrix, stearic acid, zinc oxide, an accelerant, an anti-aging agent, carbon black, paraffin, double-coated microencapsulation ammonium polyphosphate / mesoporous molecular sieve MCM-41, pentaerythritol, ammonium polyphosphate and sulfur in an open mill, and performing microencapsulation on the ammonium polyphosphate and mesoporous molecular sieve MCM-41 by employing melamine resin-zinc borate double coating, so that the thermal stability of the rubber matrix is improved. The coating defect of the melamine resin layer can be filled through the outer zinc borate layer, so that the microencapsulation coating is complete. The outer zinc borate layer is a flame retardant and an inorganic matter, and the flame retardant property and the mechanical property are effectively improved. In addition, the mesoporous molecular sieve MCM-41 has the special catalysis and adsorption functions and is synergistic with the expansion type flame retardant, so that the flame retardant property and carbon layer stability of the composite material are further improved.

Description

technical field

[0001] The invention relates to a rubber and a preparation method thereof, in particular to a double-coated microencapsulated expansion flame-retardant natural rubber and a preparation method thereof. Background technique

[0002] Rubber products are widely used, but natural rubber and most synthetic rubbers are flammable or inflammable, which limits their application in materials requiring flame retardancy. For example, the sheathing of wires and cables, various rubber products used in the electrical industry, various rubber products used in automobiles and airplanes, and rubber sheets used in public places such as shopping malls and hospitals, the importance of flame retardant treatment for them is obvious.

[0003] Intumescent flame retardant is a new type of additive flame retardant that can generate a uniform carbon foam layer on the surface when the polymer is heated, heat insulation, oxygen insulation, smoke suppression, and prevent molten droplets. I...

Examples

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...

technical field

[0001] The invention relates to a rubber and a preparation method thereof, in particular to a double-coated microencapsulated expansion flame-retardant natural rubber and a preparation method thereof. Background technique

[0002] Rubber products are widely used, but natural rubber and most synthetic rubbers are flammable or inflammable, which limits their application in materials requiring flame retardancy. For example, the sheathing of wires and cables, various rubber products used in the electrical industry, various rubber products used in automobiles and airplanes, and rubber sheets used in public places such as shopping malls and hospitals, the importance of flame retardant treatment for them is obvious.

[0003] Intumescent flame retardant is a new type of additive flame retardant that can generate a uniform carbon foam layer on the surface when the polymer is heated, heat insulation, oxygen insulation, smoke suppression, and prevent molten droplets. I...

Examples

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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