Method of preparation high surface activity rubber powder by waste tyre

A technology of high surface activity, waste tires, applied in the field of preparing high surface activity rubber powder from waste tires, can solve the problems of high energy consumption, high energy consumption and cost, low rubber powder activity in the production process, etc. The effect of high content of surface active groups and small particle size

Active Publication Date: 2005-03-23
SICHUAN UNIV
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Problems solved by technology

Liquid nitrogen refrigeration is widely used in foreign countries, and the compressed air expansion multi-stage segmental refrigeration process has also been developed in China to produce rubber powder. The common advantages of both are simple process, no pollution, and high yield of fine rubber powder, but the disadvantages are large investment, The energy consumption and cost are high. The production of each Kg of rubber powder requires 1.5-5Kg of liquid nitrogen. The fineness of the rubber powder produced by this method is less than 500μm, but the equipment investment is large, the energy consumption of the production process is as high as 1500kWh / t, and the activity of the rubber powder is higher than that at normal temperature. crushed low

Method used

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  • Method of preparation high surface activity rubber powder by waste tyre
  • Method of preparation high surface activity rubber powder by waste tyre
  • Method of preparation high surface activity rubber powder by waste tyre

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Embodiment

[0037] 1. Introduce circulating water into the cavity on the outer side of the static grinding disc of the disc-shaped mechanochemical reactor, the water temperature is 25±2°C, start the disc-shaped mechanochemical reactor, and control the speed at 30-35 rpm. Through the feeding port, add the clean tread rubber filaments (3-15mm in length, 0.5-1mm in width) obtained from discarded tires to remove the cords, reinforcing steel wires and sediment, and grind and pulverize them. Control the feeding speed to make the materials in the grinding table The residence time in the medium is between 30 and 40 seconds. The grinding process is as follows: (1) Under the static pressure of the grinding surface of 16000-18000kN, after 15 times of grinding, the rubber powder begins to agglomerate; The rubber powder is deagglomerated to obtain fine rubber powder. The specific surface area of ​​the obtained rubber powder is from 0.0073m before milling 2 / g increased to 7.23m 2 / g (measured by BE...

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Abstract

A process for preparing the rubber powder with high surface activity from the used tyre includes such steps as preparing the shreds or particles from used tyre, grinding by the 'millstone-shaped mechanico-chemical reactor' whose application number of Chinese patent is ZL95111258.9, and dispersing. It has high compatibility to polymer / rubber powder composite, asphalt and water-proof coiled material.

Description

1. Technical field [0001] The invention relates to a method for preparing high surface active rubber powder from waste tires, in particular to a method for preparing active rubber powder with large surface area and high content of oxygen-containing groups from crude waste rubber. The method provided by the invention is particularly suitable for the recycling of waste tire rubber and waste rubber products, and can also be used for recycling rubber leftovers, defective products and waste products produced in the production process. 2. Background technology [0002] With the development of the automobile industry, the generation of waste tires is increasing. The serious pollution of waste tires and other waste rubber products to the environment is a worldwide problem, and the "black pollution" mainly caused by waste tire rubber is attracting people's attention. [0003] The total output of tires in my country in 2003 reached 134 million, ranking third in the world (after the U...

Claims

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Application Information

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IPC IPC(8): B02C7/175
Inventor 卢灿辉王琪华正坤
Owner SICHUAN UNIV
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