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Richon glad to introduce thiuram accelerators are a very important class of accelerators. It includes thiuram monosulfide, thiuram disulfide and thiuram polysulfide. Among them, thiuram disulfide and thiuram polysulfide can release active sulfur or sulfur-containing free radicals at standard vulcanization temperatures, so they can be used as vulcanizing agents.
The thiuram accelerator has a thiuram derivative with the general structural formula (R, R'are alkyl, aryl, cycloalkyl, etc.; x = 1 to 6). Including thiuram monosulfide, thiuram disulfide and thiuram polysulfide. It is an acidic super accelerator with activity between dithiocarbamate and thiazole accelerators. It is generally used as a second accelerator to increase the vulcanization speed and vulcanization degree of thiazole and sulfenamide accelerators. . Disulfide and polysulfide thiuram can release active sulfur at standard vulcanization temperatures, and can be used as a sulfur donor in sulfur-free vulcanization systems.
Representative varieties are tetramethylthiuram monosulfide (TMTM), tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide (TETD), tetramethylthiuram disulfide ( DPTT) and so on.
Dalian Richon Chemical Co., Ltd. can provide you with TMTD (TT), TETD, TMTM, TRA (DPTT), TiBTD, TBzTD, TBTD, these thiuram accelerators.
TMTD is a general-purpose accelerator for natural rubber and synthetic rubber. It is also widely used as a fungicide and seed soaking agent in agriculture. Rubber accelerator TMTD is an excellent second accelerator for thiazole accelerators. It can also be used with other accelerators as an accelerator for continuous vulcanization of rubber particles. Usually it can also be used with accelerator MBT (M). In this case, it can be used with butyl rubber. The vulcanization is basically similar. The accelerator is mainly used in the manufacture of tires, inner tubes, rubber shoes, medical supplies, cables, industrial rubber products, etc. It is used as a fungicide and insecticide in agriculture, and can also be used as a lubricant additive.
2. TMTM (TS)
TMTM is a green and environmentally friendly rubber vulcanization accelerator. It can be used not only as a vulcanizing agent, but also as an effective activator for thiazole and sulfenamide accelerators. It has the function of a secondary accelerator and makes the dispersion of thiazole and sulfenamide more good, and the product is transparent. . It is widely used in natural rubber, diene synthetic rubber, isobutyl rubber, ternary isopropyl rubber, W-type chloroprene rubber. It can be used to prepare wires, cables, rubber boots, Toys, transparent products, waterproof cloth, medical rubber products, gloves, etc.
3. DPTT(TRA)
DPTT is a white or gray-yellow powder. It is soluble in carbon disulfide, chloroform and carbon tetrachloride, but insoluble in water. It can be used for natural rubber, diene synthetic rubber, butyl rubber, EPDM rubber, chlorosulfonated polyethylene and latex. Free sulfur can be decomposed by heating, and it can also be used as a vulcanizing agent. The effective sulfur content is 25% of its weight. When used as a vulcanizing agent, this product is relatively safe at operating temperature, and the vulcanized rubber has excellent heat resistance and aging resistance. This product is easy to disperse in dry rubber and water. No pollution. Generally used in the manufacture of heat-resistant products, cables, etc.
4. TBzTD
The rubber accelerator TBzTD is to replace TMTD, mainly because thiuram accelerators are prone to produce carcinogenic nitrosamines, while diphenylnitrosamines are not carcinogenic. It is used as an accelerator or secondary accelerator for NR, SBR, EPDM, NBR systems. It is safer and has a longer anti-scorch time than TMTD. It is sometimes used as a PVC rubber vulcanization inhibitor.
DalianRichon Chemical Co., Ltd. provides a domestic 2021 TMTD price trend chart.
Dalian Richon note recently TMTD’s price increased very sharply because raw materials’ price up so much.
Author: MYJ – Dalian Richon Chem Co., Ltd.
Dated: 2021-08-26
Sulphonamide Rubber Accelerators
Richon note new type promoters for tire Tire compound usually uses secondary sulphonamide promoters as main promoters, and guanidine or Thiuram as auxiliary promoters, which can make the vulcanized rubber get good mechanical properties and make the tire get good performance.
1.Introduction
This is a late acting accelerator, which is acidic. It has the characteristics of long coking time and great vulcanization activity. Degree of vulcanization of a vulcanized adhesive
Relatively high, excellent physical and mechanical properties, aging resistance is quite good. The compound has a wide vulcanization flatness. Due to the development and extensive application of synthetic rubber and the promotion and application of high dispersion furnace carbon black, special demand for good delay of the accelerator.
Therefore, this kind of accelerator occupies a very important position, and has become the fastest developing and the most promising type of accelerator in recent years.
2.Feature
1) it has tardive, long burning time, fast vulcanization speed, flat vulcanization curve, and good comprehensive properties of vulcanized rubber.
2) it should be cooperated with furnace carbon black, which has full security and is conducive to the full fluidity of pressing, calendering and molding rubber.
3) Suitable for high temperature rapid vulcanization of synthetic rubber and vulcanization of thick products.
4) With acid accelerator (TT), the formation of activated sub sulphonamide sulfide system, can reduce the amount of accelerator.
5) In general, the induction period of sulphonamide promoters is related to the size and quantity of the groups connected with the amine group.
3.Category
Among the various accelerators used in the world at present, Sulphonamides are the main ones, among which CBS(CZ), NOBS(MBS/MOR), TBBS(NS), DCBS(DZ), CBBS, TBSI and OTOS are widely used, most of which are derivatives of mercaptan benzothiazole. Among them, Dalian Richon can provide the following products：
CBS(CZ), NOBS(MBS/MOR), TBBS(NS),DCBS(DZ),CBBS,TBSI.
4.Product introduction
1)CBS(CZ):
Properties: A slight odor. Soluble in benzene, chloroform, carbon disulfide; Insoluble in water.
Application: A medium fast primary accelerator suitable for NR, IR, SBR, NBR, HR and EPDM. An outstanding delayed action accelerator. Be top effective and safe when used at ordinary processing temperatures, causing no scorches. Vulcanized show excellent physical property and quick complete. Usually used alone, when activated by D, TT and TS.
Appearance:Grayish-white powder/oiled powder/ granular.
Picture: granular for reference.
Properties: Light yellow or orange granular. No poison with a little odor of ammonia. Soluble in benzene, acetone. chloroform, insoluble in water and acid, alkali with lower concentration.
Application: An excellent delayed accelerator. The performance is similar as CZ with better scorch safety Widely used in NR, IR, SBR, NBR and EPDM. Can be used alone or with other vulcanization accelerators such as thiurams, guanidines and dithiocarbamates to improve the activity. Mainly used in manufacture of tires, shoes and belts.
Appearance:Light yellow or orange granular.
Picture: granular for reference.
3) TBBS(NS)
Properties: Without foul odor, but with bitter taste, easily soluble in benzene, carbon tetrachloride.
ethylene chloride; soluble in gasoline, ethylacetate, ethanol, acetone; insoluble in water.
Application: The product posses the best scorching quality of sulphonamides type accelerators. Its scorching quality in natural rubber is better than DIBS, the operating safety is much better. Mainly used in manufacturing of tires, rubber belts and shock absorber.
Appearance:Light yellow powder/ oiled powder/granular.
Picture: powder for reference.
4) DCBS(DZ)
Properties: Light yellow or light pink powder (granular) with taste bitter. Soluble Acetone Organic liquids, including fats and oils, insoluble in water.
Application: DCBS is a sulphonamide accelerator with excellent anti-scorching property and delayed onset of cure. It is compatible with natural and synthetic rubbers, suitable for radial ply tire, rubber belts and shock absorber, etc. Particularly it produces good adhesion to metal.
Appearance:Light yellow or light pink powder/oiled powder/granular
Picture: granular for reference
5) CBBS
Properties: Gray to white powder.
Application: CBBS is nitrosamines free products in application, showing longer scorch safety, better anti-reversion curing, lower curing speed, higher modulus and lower HBU of NR and diene rubbers than the standard CBS. To replace DCBS for the tire steel cord bonding compounds show excellent heat resistance and service durability. Suitable for tires, belts, hoses, and other TRG articles.
Appearance: Gray to white powder
Picture: powder for reference
6) TBSI
Properties: Off-white crystalline powder. Soluble in alcohol, partly soluble in diethyl ether, insoluble in water.
Application: TBSI can obtain good scorch safety and lower vulcanization rate, and show good curing reversion resistance. It can also replace primary amine accelerator TBBS and scorching retarder CTP blend and be used alone. It can improve adhesive performance between rubber and steel cord, and also improve storage stability of rubber compounds; it can replace NOBS which is carcinogenic. It can be applied to all the diene rubbers, especially thick section rubber products with high requirements on reversion resistance.
Appearance:Off-white crystalline powder
Picture: powder for reference
7) OTOS
Properties: White to gray powder, partly soluble in water.
Application: OTOS is a fast curing accelerator for natural and synthetic rubber. Especially suitable for tire, rubber shoes, hose etc. It’s non-staining but will cause slight discoloration in white or light colored compounds.
Appearance:White to gray powder
Picture: powder for reference
Author: MYJ – Dalian Richon Chem Co., Ltd.
Dated: 2021-07-26
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The price of rubber additives continued to decline during the week. At present, the market price of accelerator CBS in North China is around 21,500 rmb/ton, the market price of rubber antioxidant 6PPD in Jiangsu is around 27,000 rmb/ton, Richon feel main customers’ feedback is price down. During the week, the price of benzenamine showed a downward trend. As of this Thursday, the price of Benzenamine in North China was 9400 rmb/ton. In terms of accelerators, the price of Benzenaminefell during the week, which was bad for the price of accelerators. At the same time, under the influence of the continued weak downstream demand for accelerators, the prices of mainstream accelerators continued to be low. During the week, under the influence of weak demand and stricter policy supervision, the accelerator enterprise installations continued to restrict production or the situation of parking. Some parking enterprises in Shandong and Henan regions restarted their installations, but still maintained production restrictions. During the week, the accelerators market transactions were still weak, and downstream procurement was relatively cautious. In terms of antioxidants, the prices of MIBK and benzenamine continued to decline during the week, which is negative for the prices of antioxidants. At the same time, under the influence of the continued weak downstream demand, antioxidants still show a mismatch of supply and demand, and the prices of 4020, 4010NA and other brands continue to maintain a narrow consolidation trend. During the week, the anti-aging agent enterprise installations in some areas were shut down for maintenance. Market Forecast Richon believe In the short term, the price of rubber additives may still be on the rise. On the one hand, the price of benzenamine, the raw material of additives, is still expected to rise, which is good for the price of rubber additives; on the other hand, downstream companies start or further increase their demand for rubber additives, thereby supporting the price of rubber additives. |
Author: GXG from Dalian Richon Chem Co., Ltd.
Dated: 2021-07-16