Modified rubber powder and its prepn and use
A technology for modifying rubber and rubber powder, which is applied in chemical instruments and methods, other chemical processes, building components, etc. It can solve the problems of high cost of thermal decomposition and refining, hindering the use and development of retreading, and immature retreading technology. To achieve the effect of improving traffic safety and reliability, improving road performance and prolonging service life
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Embodiment 1
[0018] Preparation of Modified Rubber Powder Containing Maleic Anhydride Groups in Side Chain
[0019] Add 100g of 80 mesh waste styrene-butadiene rubber powder into a three-necked flask, add 1000mL of xylene, stir in an oil bath at a constant temperature of 110°C for 1h, then add 2g of dibenzoyl peroxide (BPO) and 10g of maleic anhydride, and heat up to 130°C , finished after constant temperature stirring reaction 5h, filtered, and the product obtained was placed in a vacuum oven and dried to obtain 105 grams of modified rubber powder, and the grafting ratio of maleic anhydride in the modified rubber powder was 4.7%.
[0020] The obtained above-mentioned side chain containing maleic anhydride modified rubber powder is subjected to further hydrolysis, aminolysis or reaction with alcohol to obtain the corresponding carboxyl, amide or ester modified rubber powder.
Embodiment 2
[0022] Preparation of Modified Rubber Powder Containing Hydroxyl in Side Chain
[0023] Put 100 meshes and 100g of waste SBS rubber powder into a three-necked flask, add 1000mL of cyclohexane, seal it with 10mL of styrene, alternately evacuate and blow nitrogen three times, add 2mL of tetrahydrofuran with a syringe, place the flask in an ice-water bath, and fully stir Slowly add 2g of n-butyllithium with a syringe, shake it from time to time to remove harmful impurities in the system, until light yellow appears and does not fade within 5min, add 10mL of tetrahydrofuran solution of α-methylnaphthalenelithium with a syringe, where Containing 2 grams of α-methylnaphthalene lithium, the system immediately turns dark red and exothermic. After the system no longer exothermic, place it on a constant temperature magnetic stirrer at 35°C to continue the reaction for 1 hour;
[0024] Add an amount of ethylene oxide 5 times the amount of the initiator to the solution, the red color of th...
Embodiment 3
[0026] Preparation of modified rubber powder with carboxyl group in side chain
[0027] Add 100g of waste natural rubber powder of 60 meshes to a three-necked flask, add 1000mL of tetrahydrofuran, seal with 10mL of styrene, alternately evacuate and blow nitrogen three times, add 10mL of tetrahydrofuran with a syringe, place the flask in an ice-water bath, and slowly Slowly add 2g of n-butyllithium, shake it from time to time to remove harmful impurities in the system, until light yellow appears and does not fade within 5min, quickly add 10mL tetrahydrofuran solution of α-methylnaphthalenelithium with a syringe, which contains α - 2 grams of lithium methylnaphthalene, the system immediately turns dark red and exothermic rapidly, after the system is no longer exothermic, place it on a constant temperature magnetic stirrer at 35°C to continue the reaction for 1 hour;
[0028] Introduce carbon dioxide 5 times the amount of the initiator into the solution, the red color of the solu...
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