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A kind of preparation method of plastic rubber powder

A rubber powder and plasticity technology, which is applied in the field of plastic rubber powder preparation, can solve the problems of low crushing efficiency, large rubber powder particles, and damage to rubber molecular chains, and achieve long processing time, good plasticity, and reduced internal friction.

Active Publication Date: 2021-06-29
TIANTAI KUNRONG RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing recycling technologies on the market include normal temperature method and low temperature method. The normal temperature method has low crushing efficiency, low production capacity, and is easy to agglomerate, and the particles of rubber powder are large, so it is impossible to prepare fine rubber powder. Waste rubber powder generally only reaches 40-60 mesh, it is difficult to produce fine or fine rubber powder above 180 mesh, and it is extremely difficult to produce fine rubber powder above 200 mesh
The low temperature method uses liquid nitrogen, which needs to freeze waste tires to minus 175 degrees. The investment in low temperature treatment equipment is large, and the operating cost is very high. Too low temperature will also destroy the molecular chain of rubber, so that the quality of the prepared rubber powder is not good. high

Method used

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  • A kind of preparation method of plastic rubber powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] S1: Cut waste tires into small pieces, remove dust and pollutants on the surface by ultrasonic cleaning in deionized water for 15 minutes at room temperature; remove oil stains on the surface by ultrasonic cleaning with 5wt% NaOH solution for 30 minutes at room temperature; remove metal impurities by magnetic separation, and After crushing, 3-5cm pretreated rubber particles are obtained;

[0025] S2: Add the pretreated rubber particles described in step S1 to a hydrogen peroxide solution with a mass concentration of 10%, control the solid-to-liquid ratio to 1:10, adjust the pH to 1.8 with acetic acid and keep it, and stir for 40 minutes at room temperature , to obtain surface-modified rubber particles after filtering and draining;

[0026] S3: Disperse the surface-modified rubber particles described in step S2 in the ethanol solution, control the solid-to-liquid ratio to 1:15, stir and react at a temperature of 50°C for 15 minutes; then add trimethylacetic anhydride, th...

Embodiment 2

[0030] S1: Cut waste tires into small pieces, remove dust and pollutants on the surface by ultrasonic cleaning in deionized water for 20 minutes at room temperature; remove oil stains on the surface by ultrasonic cleaning with 5wt% NaOH solution for 40 minutes at room temperature; remove metal impurities by magnetic separation, and After crushing, 3-5cm pretreated rubber particles are obtained;

[0031] S2: Add the pretreated rubber particles described in step S1 to the hydrogen peroxide solution with a mass concentration of 15%, control the solid-to-liquid ratio to 1:20, adjust the pH to 2.2 with acetic acid and keep it, and stir for 70 minutes at room temperature , to obtain surface-modified rubber particles after filtering and draining;

[0032] S3: Disperse the surface-modified rubber particles described in step S2 in the ethanol solution, control the solid-to-liquid ratio to 1:25, stir and react at a temperature of 80°C for 35 minutes; then add trimethylacetic anhydride, ...

Embodiment 3

[0036] S1: Cut waste tires into small pieces, remove dust and pollutants on the surface by ultrasonic cleaning in deionized water for 20 minutes at room temperature; remove oil stains on the surface by ultrasonic cleaning with 5wt% NaOH solution for 30 minutes at room temperature; remove metal impurities by magnetic separation, and After crushing, 3-5cm pretreated rubber particles are obtained;

[0037] S2: Add the pretreated rubber particles described in step S1 to a hydrogen peroxide solution with a mass concentration of 15%, control the solid-to-liquid ratio to 1:15, adjust the pH to 2.0 with acetic acid and keep it, and stir for 55 minutes at room temperature , to obtain surface-modified rubber particles after filtering and draining;

[0038] S3: Disperse the surface-modified rubber particles described in step S2 in the ethanol solution, control the solid-to-liquid ratio to 1:20, stir and react at a temperature of 65°C for 25 minutes; then add trimethylacetic anhydride, the ...

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Abstract

The invention provides a method for preparing plastic rubber powder, comprising the following steps: coarsely crushing waste tires to obtain pretreated rubber particles; adding hydrogen peroxide solution, adjusting the pH to 1.8-2.2 and maintaining it, and stirring at room temperature for reaction, After filtering and draining, surface-modified rubber particles are obtained; disperse the surface-modified rubber particles in an ethanol solution, and stir at a controlled temperature; then add trimethylacetic anhydride, and stir at a controlled temperature; add a silane coupling agent, and continue the reaction for 1‑3h ; After cooling down to room temperature, freeze the obtained rubber particles at a temperature of minus 90°C to minus 80°C, crush and sieve to obtain 200‑400 mesh rubber powder; add the above rubber powder to ethanol, acetyl tributyl citrate, Dihexyl azelate, antioxidant 702 and attapulgite were stirred and reacted at a temperature of 80-120°C at a rate of 500-1000r / min for 2-4h; cooled and filtered to obtain plastic rubber powder.

Description

technical field [0001] The invention relates to the technical field of rubber powder preparation, in particular to a method for preparing plastic rubber powder. Background technique [0002] With the increase of car ownership, the amount of waste tires is rapidly increasing. A large amount of waste tire rubber not only takes up space, but also causes great pollution and harm to the social environment because it is difficult to degrade naturally in nature; waste tires are prepared into rubber powder , Recycling and turning waste into treasure has practical significance for green development and environmental improvement. [0003] Waste tire fine rubber powder is one of the ways to recycle and comprehensively utilize waste tires. Mesh below 40 can be used as the main raw material of regenerated rubber; mesh 60-100 can be used as an additive to replace part of the original rubber; at the same time, it can improve the aging resistance of rubber products. At present, the existi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L19/00C08L67/02C08K13/04C08K7/26C08K5/103C08K5/13C08C19/04C08C19/00C08C19/25
CPCC08C19/00C08C19/04C08C19/25C08K5/103C08K5/13C08K7/26C08K13/04C08L19/003C08L2207/24C08L67/02
Inventor 孔永胜孔祥荣许琦
Owner TIANTAI KUNRONG RUBBER CO LTD
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