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Full-rubber-powder elastomer material capable of being repeatedly processed and preparation method of full-rubber-powder elastomer material

An elastomer material and a technology for repeated processing, which is applied in the field of preparation of all rubber powder elastomer materials

Active Publication Date: 2021-07-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]Recycling of rubber has attracted much attention. Due to the formation of an irreversible three-dimensional covalent cross-linked network structure of traditional cross-linked rubber, most of them can only be incinerated and filled. buried
This kind of all-rubber powder elastomer material with repeated processing performance has not been reported in the field of waste rubber powder recycling, and has great development potential

Method used

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  • Full-rubber-powder elastomer material capable of being repeatedly processed and preparation method of full-rubber-powder elastomer material
  • Full-rubber-powder elastomer material capable of being repeatedly processed and preparation method of full-rubber-powder elastomer material
  • Full-rubber-powder elastomer material capable of being repeatedly processed and preparation method of full-rubber-powder elastomer material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) 40 mesh waste rubber powder and tetramethylpiperidine nitroxide free radical phosphite triester are according to the ratio of mass and number of 100:10 on the open mill and mixed evenly at room temperature to obtain the mixed rubber, and the mixed rubber was Thermal crosslinking at 140°C for 30 minutes, followed by cold pressing at room temperature for 5 minutes to obtain a full-rubber powder elastomer with repeatable processing properties.

[0029] (2) The repeated processing of the elastomer material is to heat the used all-rubber powder elastomer into powder on a 140°C open mill, and then open the mill at room temperature to produce sheets, and then place it on a flat vulcanizer at 140°C Heat cross-linking for 30 minutes, and finally cold pressing at room temperature for 5 minutes to obtain a full rubber powder elastomer that can be repeatedly processed. The repeated processing process is as follows: figure 1 shown.

[0030] (3) The tensile test experiment shows...

Embodiment 2

[0032] (1) 120 mesh waste rubber powder and 1,10-sebacic acid-4,4'-bis(1-oxidation-2,2,6,6-tetramethyl)piperidinate are prepared according to the ratio of parts by mass Mix 100:1 on an open mill at room temperature to obtain a compound rubber, heat crosslink the compound rubber at 120°C for 60 minutes, and then cold press it at room temperature for 5 minutes to obtain a full-rubber powder elastomer with repeatable processing properties.

[0033] (2) The repeated processing of the elastomer material is to heat the used all-rubber powder elastomer on a 120°C open mill to form a powder, and then roll out the sheet at room temperature, and then place it on a flat vulcanizer at 120°C Heat cross-linking for 60 minutes, and finally cold pressing at room temperature for 5 minutes to obtain a repeat-processed full rubber powder elastomer. The repeat process is as follows: figure 1 shown.

[0034] (3) The full-rubber powder elastic body obtained in Example 2 also has good mechanical stre...

Embodiment 3

[0036] (1) First synthesize a compound containing two stable nitroxide free radicals: dissolve 17.2g of 4-hydroxyl-2,2,6,6-tetramethylpiperidine-1-oxyl free radical in 20ml of toluene, drop slowly Add 11.1 g of isophorone diisocyanate, place the reaction at 80° C., and react for 8 hours under a nitrogen atmosphere to obtain a compound containing two stable nitroxide radicals.

[0037] (2) Mix the 10-mesh waste rubber powder and the synthesized compound containing two stable nitrogen-oxygen free radicals according to the ratio of mass and number of 100:15 on the open mill at room temperature to obtain the mixed rubber, and mix the mixed rubber at 180 Thermal crosslinking at ℃ for 30 minutes, and then cold pressing at room temperature for 5 minutes to obtain a full-rubber powder elastomer with repeatable processing properties.

[0038] (3) The infrared spectrogram of waste rubber powder, rubber compound in embodiment 3 and full rubber powder elastomer material in embodiment 3 is...

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Abstract

The invention discloses a full-rubber-powder elastomer material capable of being repeatedly processed and a preparation method of the full-rubber-powder elastomer material. The method comprises the specific steps of mixing waste vulcanized rubber powder with a modifier containing two or more stable nitroxide free radicals, and carrying out thermal crosslinking to obtain the full-rubber-powder elastomer material with repeated processing performance. The modifier containing two or more stable nitroxide free radicals is introduced into the waste vulcanized rubber powder, a thermally reversible alkoxy amine cross-linked structure can be formed at an interface through reaction with a rubber molecular chain in the rubber powder, and finally the full-rubber-powder elastomer material with repeated processing performance is obtained. The method is simple in process and suitable for existing rubber processing equipment, the prepared full-rubber-powder elastomer material has excellent mechanical properties and repeated processing efficiency, a new method is developed for recycling of waste vulcanized rubber powder, and the current time background of green development is met.

Description

technical field [0001] The invention relates to the field of waste rubber powder recycling, in particular to the activation and modification of waste rubber powder by stabilizing nitrogen oxide free radicals, forming a thermally reversible cross-linking structure in the material, and obtaining a full rubber with excellent mechanical properties and repeatable processing performance Preparation method of powder elastomer material. Background technique [0002] The recycling of rubber has always been a concern. Due to the formation of an irreversible three-dimensional covalent cross-linked network structure, traditional cross-linked rubber can only be disposed of by incineration and landfill. However, these unenvironmental disposal methods will seriously pollute the environment and affect the sustainable development process. With the enhancement of people's awareness of environmental protection and technological innovation, processing waste rubber into rubber powder can be use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L19/00C08K5/521C08K5/3435
CPCC08J3/247C08J2319/00C08K5/521C08K5/3435Y02W30/62
Inventor 王小萍胡长远骆岐明
Owner SOUTH CHINA UNIV OF TECH
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