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A kind of reprocessable sulfur vulcanized rubber and preparation method thereof
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A technology of repeated processing and sulfur vulcanization, which is applied in the field of rubber materials, can solve the problems of poor mechanical properties and difficult practical application prospects, and achieve the effects of high performance retention rate, low cost and simple process
Active Publication Date: 2021-09-28
SOUTH CHINA UNIV OF TECH +1
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At present, people have successfully synthesized chemically crosslinked and thermoplastically processable elastomers by using dynamic covalent bonds such as boronate exchange, disulfide exchange, olefin metathesis, and DA reactions as crosslinks, but these elastomers generally require Multi-step synthesis and poor mechanical properties, it is difficult to have practical application prospects
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Embodiment example 1
[0029] (1) The butyryl rubber, white carbon black, coupling agent Si69, and thiol salts are sequentially mixed into the mesh for 10 minutes, and the initial temperature is 50 ° C to obtain a mixed glue;
[0030] (2) In the open mill, rubber activator zincoxide, stearic acid, anti-aging agent 4010NA, accelerator Cz, accelerator DM, and sulfur sequentially, the kneading time is 8 minutes. ;
[0032] (4) The vulcanized rubber was frozen to 80 mesh particles, and then hot for 30 minutes at 150 ° C for 30 minutes to give another rubber.
[0033] Different sulfonium salts are selected and the sulfonium salt is added, comparisons and 6 embodiments are prepared according to the above methods of the present invention. The specific formulation of the comparative sample and the embodiment is shown in Table 1 below, and each of the substances in the table is g.
[0034] Table 1
[0035]
[0036] The tensile strength and elong...
Embodiment example 2
[0041] (1) Put rubber, carbon black, alkylationreagent or sulfonium salt into the open mill for 8 minutes to obtain a mixture;
[0042] (2) In the open mill, rubber activator zincoxide, stearic acid, anti-aging agent 4020, accelerator NS, and sulfur sequentially added to the above-mentioned kneading glue, and the kneading time is 5 minutes.
[0043] (3) Vulcanization is performed at a positive vulcanization time at 143 ° C;
[0044] (4) The sulfurized rubber is frozen to rubber particles having a particle diameter of 2 mm, and then heat for 45 minutes at 150 ° C for 45 minutes to obtain a retracted rubber;
[0045] (5) The rewiring rubber obtained by the nth cycle was pulverized to 2 mm of particles (N> 0), and then hot for 45 minutes at 150 ° C to give the Nort + 1 Raw rubber.
[0046] The isoprene is a substrate, and the different vulcanization systems are selected; the alkylation reagent or a sulfide salt is used in accordance with the above method of the present invention, t...
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Abstract
The invention discloses a reprocessable sulfur vulcanized rubber and a preparation method thereof. The method comprises blending raw rubber, filler, coupling agent, sulfonium salt or alkylating agent to obtain compound rubber, adding vulcanizationpackage and anti-aging agent, and then vulcanizing to obtain the reprocessable sulfur vulcanized rubber. The present invention is by adding sulfonium salt in the rubber material of sulfurvulcanization, or carries out alkylation reaction to generate sulfonium salt by adding alkylating agent and C-S cross-linking bond in rubber crosslinking network, utilizes sulfonium salt and The alkylation exchange reaction between the C‑S crosslinks realizes the rearrangement of the topology of the rubber crosslinking network, making the crosslinked rubber material reprocessable repeatedly. The reprocessed rubber has a high performance retention rate and can be repeatedly processed. This method is simple and is suitable for sulfur crosslinked rubber materials commonly used in the rubber industry. It does not require additional rubber peptizers. It is used in the recycling of sulfur vulcanized rubber. have important prospects.
Description
Technical field [0001] The present invention relates to the field of rubber materials, and more particularly to a repeatable processed sulfur vulcanized rubber and a preparation method thereof. Background technique [0002] The rubber covalent bond cross-linking is a prerequisite for high elasticity, excellent mechanical properties and good environmental stability, but covalent bonding leads to rubber difficult to repeat processing and reuse. Due to the lack of lack of rubber resources and environmental protection awareness, the recovery of cross-linking rubber materials is concerned by the researchers of the world. At present, most of the waste rubber can only be used as a thermal energy utilization or pulverized to make rubber powder for building materials (plastic runway, asphalt pavement, etc.), resulting in resource waste and environmental pollution; and some waste rubber Under physical and chemistry, the desulfurization is cut off the crosslinking bond to obtain a regenerat...
Claims
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