RUBBER VULCANIZING ACCELERATOR TMTD (TT)

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Tianjin
Payment Terms:
TT OR LC
Min Order Qty:
25 m.t.
Supply Capability:
12000 m.t./month

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Product Description:

RUBBER VULCANIZING ACCELERATOR TMTD(TT) 

 

Chemical Name : Tetramethyl thiuram disulfide
 Molecular Formula: C6H12N2S4
 Molecular Weight: 240.43
CAS NO. : 137-26-8
Executive standardHG/T 23342007 
Specification: 


Item 

Index

First-class products

Acceptable end-product

Appearance
(Visual inspection)


White, light gray powder or granular 

 Initial M.P, oC             ≥ 

142.0

140.0

Loss on drying, %          ≤ 

0.30

0.30

Ash, %                        ≤ 

0.30

0.30

Residues on 150μm sieve, %                           ≤ 

0.00

0.10

Properties: White, light gray powder or granular. The density is 1.29. Soluble in benzene, acetone, chloroform, CS2 partly soluble in alcohol, diethyl ether, CCI4 insoluble in water, gasoline and alkali with lower concentration. Meeting hot water becomes to dimethylamine  ammonium and CS2. Be sensitive to skin and pneogaster

Application: Can be used as a single accelerator, as a secondary accelerator or as a sulphur donor in most sulphur-cured elastomers. Scorchy and gives fast cure rates. Produces an excellent vulcanisation plateau with good heat aging and compression set resistance in sulphurless and EV cure systems Good color retention is obtained in non-black vulcanisation. A valuable secondary accelerator for EPDM. May be used as a retarder in the vulcanisation of polychloroprene rubber with ETU and also be used as bactericide and pesticide

Packaging: 25kg plastic woven bag, paper with plastic film bag, kraft paper bag.

Storage: The product should be stored in the dry and cooling place with good ventilation, avoiding exposure of the packaged product to direct sunlight. The validity is 2 years.

Note: The product could be ultrafine powder based on customer accurate requirement.

 

 


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Q:About the catalyst?
Catalysts are not used/destroyed in any reactions, it merely speeds up the process by lowering the reaction activation energy. It functions by being able to weaken or break the required bonds necessary in the chemical reaction (thus lowering activation energy) through temporary and weak bonding to form a complex. In this case the H2O2 molecule will bind with the MnO2 molecule due to the complimentary sites (thus forming a complex) to weaken the bonds for decomposition, but after decomposition the products (oxygen and water molecules) break off from the catalyst (as there are no more complementary sites with them) thus the catalyst will not be destroyed.
Q:Chemical reaction in the presence of catalyst for the reaction are carried out a high life
Theoretically are carried out, but some of the reaction is relatively slow, so we classified it as non-response, the catalyst is only to speed up or slow down the reaction rate of the reaction itself does not affect the reaction. I'm on high school.
Q:how heterogeneous catalyst work?
The Reduction Catalyst The reduction catalyst is the first stage of the catalytic converter. It uses platinum and rhodium to help reduce the NOx emissions. When an NO or NO2 molecule contacts the catalyst, the catalyst rips the nitrogen atom out of the molecule and holds on to it, freeing the oxygen in the form of O2. The nitrogen atoms bond with other nitrogen atoms that are also stuck to the catalyst, forming N2. For example: 2NO =N2 + O2 or 2NO2 =N2 + 2O2 The Oxidization Catalyst The oxidation catalyst is the second stage of the catalytic converter. It reduces the unburned hydrocarbons and carbon monoxide by burning (oxidizing) them over a platinum and palladium catalyst. This catalyst aids the reaction of the CO and hydrocarbons with the remaining oxygen in the exhaust gas. For example: 2CO + O2 =2CO2
Q:What is the effect of increasing the amount of catalyst added to a solution?
A catalyst works by providing the optimal conditions for a reaction to occur, so the more there is, the more contact it has with the reactant/s, so the more there is, the faster the reaction will take place, until there is a point where there are too many catalyst sites for the number of reactant molecules, so it doesn't speed it up any further past that point, if it's a relatively slow reaction it may slow the process by diluting the solution too much with useless catalyst sites, but generally the reaction rate will reach a point where it will not become any faster, and stay at that maximum speed. less catalyst does mean less speed though, as the catalyst sites have more work to do. hope this helps.
Q:Before and after the reaction, the chemical properties and quality of the water did not change, and the water was the catalyst
Dry aluminum powder and iodine does not react, there is water to react.
Q:Does the nature and quality of the catalyst itself change before and after the chemical reaction?
No, but in some cases it may produce catalyst poisoning
Q:Pls help me define a catalyst.?
In chemistry and biology, catalysis is the acceleration (increase in rate) of a chemical reaction by means of a substance, called a catalyst, that is itself not consumed by the overall reaction. The word is derived from the Greek noun κατάλυσις, related to the verb καταλύειν, meaning to annul or to untie or to pick up. A catalyst provides an alternative route of reaction where the activation energy is lower than the original chemical reaction. Catalysts participate in reactions but are neither reactants nor products of the reaction they catalyze. An exception is the process of autocatalysis where the product of a reaction helps to accelerate the same reaction. They work by providing an alternative pathway for the reaction to occur, thus reducing the activation energy and increasing the reaction rate. More generally, one may at times call anything that accelerates a reaction, without itself being consumed or changed, a catalyst (for example, a catalyst for political change). A good example of a catalyst is in the disproportionation of hydrogen peroxide. Hydrogen peroxide reacts to give water and oxygen gas by itself: 2 H2O2 → 2 H2O + O2 Usually, this reaction is slow. On the addition of manganese dioxide to a dilute solution of hydrogen peroxide, an effervescence is observed, and much oxygen, detectable by a glowing splint, is evolved. The manganese dioxide may be recovered, and re-used indefinitely, thus it is a catalyst — it is not consumed by the reaction. A promoter is an accelerator of catalysis, but not a catalyst by itself. An inhibitor inhibits the working of a catalyst.
Q:What is the difference between the conditions in the iron as a catalyst can not be reacted with toluene to produce tribromotoluene?
The concentrated bromine water is a bromine aqueous solution and the liquid bromine is pure bromine. Only liquid bromine can produce tribromotoluene, and to add iron powder as a catalyst, and the main production is to lead bromotoluene and p-bromotoluene, tribromotoluene this content is very small.
Q:Why can some catalysts be reused in (chemistry)?
Because the catalyst in the chemical reaction before and after the quality and chemical properties have not changed, so in the chemical reaction can be reused.
Q:Catalyst - Can it decrease the rate of a reaction?
no, by defintion the catalyst speeds up the reaction.

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