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Anti-scorching CR unvulcanized rubber capable of being stored for long time at room temperature, preparation method thereof and preparation method of anti-scorching agent

A long-term storage, unvulcanized technology, applied in the direction of organic chemistry, etc., can solve the problems of ozone resistance, oil resistance, poor fatigue resistance, no formulation and specific process methods, no mention of long-term storage of CR compound rubber, etc., to achieve strong Reduced elongation, excellent scorch safety, and good processability

Active Publication Date: 2022-01-14
ZHUZHOU TIMES RUIWEI ANTI VIBERATION EQUIP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not suitable for final rubber mixing and has obvious limitations. Manufacturers without rubber mixing equipment cannot evenly add the remaining small materials. In addition, it is not suitable for products that need to be made into semi-finished products (such as tapes, films, etc.) and stored for a long time.
[0005] Application number CN201310661911.4, an invention patent application named "a stable neoprene rubber", announced a neoprene rubber compound with certain stability, which avoids the occurrence of CR instability in a short period of time. Decomposition issues, thus avoiding waste, but the scorch resistance of the neoprene is not addressed, and the CR compound can be stored at room temperature for a long time
[0006] Application number CN201510630352.X, an invention patent application titled "a modified chloroprene rubber with combined use", discloses the use of NR to improve CR's poor cold resistance, sticking rollers during rubber mixing, easy scorch and high cost. However, NR It is a non-polar rubber, and its ozone resistance, oil resistance, and fatigue resistance are all worse than CR. It is not suitable for products with higher performance requirements, and it does not involve CR. The compound can be stored at room temperature for a long time
[0007] The papers "Neoprene rubber storage stability and processing scorch" and "Measures to avoid scorch during storage and use of neoprene rubber" only involve measures to avoid scorch during storage and processing of neoprene raw rubber, and do not involve specific The formula and specific process methods, not to mention the measures that CR compound rubber can be stored at room temperature for a long time

Method used

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  • Anti-scorching CR unvulcanized rubber capable of being stored for long time at room temperature, preparation method thereof and preparation method of anti-scorching agent
  • Anti-scorching CR unvulcanized rubber capable of being stored for long time at room temperature, preparation method thereof and preparation method of anti-scorching agent
  • Anti-scorching CR unvulcanized rubber capable of being stored for long time at room temperature, preparation method thereof and preparation method of anti-scorching agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This example is the production method of the anti-scorch agent. In the reaction vessel, add 2-mercaptobenzothiazole (0.21mol, 35.0 g), 3,5-dibromosalicylic acid (0.10 mol, 29.6 g), carbonic acid Sodium (0.3 mol, 31.8 g), sodium iodide (0.02 mol, 3.0 g) and ethanol solvent (5.0 mol, 288 mol) were reacted at 50-80°C for 24-48 h in a nitrogen atmosphere. After the reaction is finished, the solvent is spin-dried and vacuum-dried to obtain figure 1The shown 3,5-dibenzothiazole salicylic acid is referred to as DPNTS for short, and the reaction formula is as follows figure 2 shown.

Embodiment 2

[0038] The components and mass parts of the rubber compound are: 100 parts of neoprene rubber, 4 parts of high-activity magnesium oxide, 0.5 parts of stearic acid, 20 parts of carbon black, 30 parts of white carbon black, 1 part of coupling agent, and 15 parts of alkane oil Parts, 2 parts of zinc oxide by indirect method, 3 parts of dimorpholine disulfide, 0.5 parts of insoluble sulfur, 0.5 parts of N-oxydiethylene-2-benzothiazole sulfenamide, 0.6 parts of ethylene thiourea, functional type Anti-scorch agent 3,5-dibenzothiazole salicylic acid 0.2 parts, anti-sticking agent 2 parts.

[0039] The preparation process of the rubber material is as follows: the neoprene rubber is thinly passed on the open mill and then removed, put into the internal mixer or the open mixer, and then put into carbon black, white carbon black, coupling agent, functional anti-scorch agent, anti-scorch agent, etc. Roller sticky agent, after mixing for 12 minutes, discharge the glue, the temperature of t...

Embodiment 3

[0041] The components and mass parts of the rubber are: 75 parts of neoprene rubber, 25 parts of chlorinated polyethylene CM, 5 parts of magnesium oxide, 0.7 parts of stearic acid, 20 parts of calcium carbonate, 30 parts of white carbon black, coupling agent 2.0 parts of Si-69, 15 parts of naphthenic oil, 4 parts of indirect zinc oxide, 0.5 parts of functional anti-scorch agent 3,5-dibenzothiazole salicylic acid, 1,3-trimethylene-2-thiourea 0.3 parts, 2.0 parts of N,N'-m-phenylene bismaleimide, 0.3 parts of N-cyclohexyl-2-benzothiazole sulfenamide, 2 parts of antioxidant 1010.

[0042] The rubber preparation process is as follows: according to the ratio of 5-10 parts to 100 parts of chlorinated polyethylene, add naphthenic oil to chlorinated polyethylene powder and stir evenly, and pass it on the cold roll mill for more than 10 times until the film into uniform translucence, and the next sheet is ready for use; the neoprene raw rubber and the above-mentioned thin-passed film a...

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Abstract

The invention relates to anti-scorching CR unvulcanized rubber capable of being stored for a long time at room temperature, a preparation method thereof and a preparation method of an anti-scorching agent. The materials comprise raw rubber, a reinforcing filler, a plasticizer, a vulcanization accelerator, a coupling agent, an anti-aging agent, the anti-scorching agent, an active agent and a processing aid. The preparation method of the unvulcanized rubber comprises the steps of firstly, preparing the materials into a prefabricated rubber sheet; then adding the prefabricated rubber sheet into an internal mixer or an open mill, adding the active agent, the reinforcing filler, the plasticizer, the coupling agent, the anti-scorching agent, other processing aids and the like, mixing at low temperature, and discharging rubber to prepare a first section of rubber compound; and finally, standing and cooling the first section of rubber compound, adding the vulcanization accelerator and the anti-aging agent into an open mill for mixing, fully opening cooling water during open mixing, performing low-temperature thin passing, uniformly mixing, and batching off to obtain the final rubber compound. Through multi-aspect improvement, the generated rubber material not only has excellent scorching safety, but also can be stored for a long time.

Description

technical field [0001] The invention relates to a CR unvulcanized rubber and a preparation method thereof, in particular to a scorching-proof CR unvulcanized rubber which can be stored for a long time at room temperature and a preparation method thereof. Background technique [0002] Chloroprene rubber is a kind of polymer elastomer polymerized by 2-chloro-1,3 butadiene. It is one of the main varieties of synthetic rubber, and it is also an earlier developed synthetic rubber. As a general-purpose special rubber, in addition to the good physical properties of general rubber, it also has excellent heat resistance, weather resistance, oil resistance, flame retardancy, flex fatigue and chemical corrosion resistance, etc., and is widely used in manufacturing Rubber hoses, tapes, wires and cables, adhesives, printing rubber rollers, bridge bearings, coatings, flame-retardant conveyor belts, air ducts, corrosion-resistant linings, etc. [0003] Although neoprene rubber has excelle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L11/00C08L23/28C08L27/06C08K3/22C08K5/47B29B7/56B29B7/72B29B7/18B29B7/28C07D277/74
CPCC08K5/47C08K3/22C08L11/00B29B7/56B29B7/726B29B7/18B29B7/286C07D277/74C08K2003/2296C08K2003/222C08L23/286C08L27/06Y02T10/86
Inventor 黄良平谢竞慧余海文谭莲影张志广穆洪帅宋大龙刘权肖程远王雪飞
Owner ZHUZHOU TIMES RUIWEI ANTI VIBERATION EQUIP LTD
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