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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

Inactive Publication Date: 2007-06-06
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the immaturity of domestic used tire retreading technology and insufficient tire sources, the use and development of retreading are hindered
The recovery cost of pyrolysis refining is high and the pollution is heavy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The present invention relates to modified rubber powder and its preparation process and use. Structurally, the modified rubber powder has alkyl group, alkenyl group, hydroxyl group, carboxyl group, nitrile group or amino group in the side chain or has side chain connected via double bond reaction to butadiene, polystyrene, vinyl acetate, acrylate, acrylonitrile or other compound. The modified rubber powder has the structural features of rubber retained and thus excellent mechanical performance, physical and chemical performance and machining performance. The introduction of functional group to the side chain results in obviously raised compatibility with other rubber material, plastic and other polymer material, easy grafting reaction and functional group chemical reaction for further modification. In addition, the performances may be regulated via altering the sort and amount of the introduced functional groups.

Description

technical field [0001] The invention relates to a modified rubber powder and its preparation method and application, which are applied in the fields of chemical industry and engineering technology. Background technique [0002] According to statistics, about 100 million tons of waste rubber are produced in the world every year. The country with the largest amount is the United States, followed by China, but the recycling rate is very low. A large amount of waste rubber such as various old tires, hoses, rubber sheets, and tapes , rubber shoes, etc. have not been utilized, resulting in a serious waste of resources. Since waste rubber is not easy to degrade, incineration will bring air pollution, so the increasing waste rubber has become a global problem, and the resulting "black pollution" has become a major social hazard, seriously affecting my country's sustainable development strategy . With the rapid development of the global economy and the format...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F253/00C08F291/02C08J3/12C08L75/04C08L95/00C09J11/06C09D7/12C09K3/10
Inventor 鄢国平梅黎黎王晓燕邓星亮
Owner WUHAN INSTITUTE OF TECHNOLOGY
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