ZDEC EZ-80 Rubber Accelerator Sbr Carrier

Active raw material: Diethyldithiocarbamate.

Molecular formula£ºC10H20N2S4Zn

Package: 25kg / piece

Active content:80
Colour: White
Carrier: SBR
Density:1.3
Melting point:≥175¡æ
Proportion:1.35±0.05

Function: mainly used as overspeed accelerator for IR, NR, SBR, NBR, BR, EPDM and other rubber. This product is a good active agent for thiazole and sulfosamide accelerators. Alkaline accelerator can activate it and has good dispersion. It can improve the tensile strength and elasticity of vulcanizate. Antioxidants should be added to NR and IR to improve heat resistance. Suitable for white, bright and transparent products.

Application: tire, conveyor belt, seal, cable sheath and other industrial products as well as shoe products.

Storage: keep it in a dry and cool place, away from heat or direct sunlight, and seal the original package for one year.

Dosage: the general dosage is 0.5PHR-1.0PHR.

I. What is a Rubber Accelerator? What is the function?

rubber various accelerator masterbatches are also called vulcanization accelerators, referred to as accelerators. Any substance that can promote the activation of a vulcanizing agent, and accelerate the cross-linking reaction between vulcanizing agent and rubber molecules, so as to shorten the vulcanization time and reduce the vulcanization temperature is called a vulcanization accelerator.

The main role of the accelerator has the following 5.

• accelerate the speed of vulcanization
• shorten the vulcanization time
• reduce the vulcanization reaction temperature
• reduce the amount of vulcanizing agent
• improve the physical and mechanical properties of vulcanized rubber

Second, the classification and selection of accelerators

As there are many types of accelerators on the market, there are also many classifications, which can be classified from different angles. Here we introduce four common ways of classifying accelerators.

(A) by chemical structure classification

1, thiazole class: representative products M, DM, MZ, such in the rubber vulcanization process, will not produce carcinogenic nitrosamines, so the use of a wide range of products, but this type of accelerator also has its shortcomings, mainly allergic reactions are easily caused.

2, sub-sulfonamides: representative products TBBS, CZ, DZ, NOBS, NS. such additives are mainly developed by Monsanto, because of the fast vulcanization speed, there is no nitrosamines carcinogenic problems widely used. At present, it has become one of the world’s leading rubber accelerator species, and its total consumption accounts for about 35% of global accelerator consumption.

3、Thiuram class: representative products TMTD, TMTM, TETD, DPTT, etc. TMTD type accelerator is still used because of its good promotion effect and low price advantage, but because it is proved that in the use of rubber products as accelerators will produce strong carcinogenic nitrosamines, so there is a gradual replacement by more environmentally friendly zinc, nickel and other complex salt vulcanization accelerators. The trend.

4, dithiocarbamates: representative products ZBEC, ZDC, BZ, PZ, such products because of good coke resistance, safe operation, in the use of the process is not easy to produce carcinogenic nitrosamines, the use of a wide range of substances.

5, xanthates: representative products DIP, ZIX. such accelerators because of its rapid promotion speed and mainly used for room temperature latex vulcanization, compared with the vulcanizing agent of the autumnal class, also has the advantage of not producing carcinogenic substances such as nitrosamines. However, these accelerators are heavy in odor, polluting to the environment, and are toxic.

In addition to the 5 types, there is guanidine: representative products DPG, DOTG; thiourea: representative products ETU, DETU, DPTU; aldehyde amine: representative products H, 808, and so on.

(B) classification according to pH value

1、Acidic (type A): thiazole class, thiram class, dithiocarbamate class xanthate class.
2, alkaline (B type): hyposulfite class, thiourea class.
3、Neutral accelerator (N type): guanidine, aldehyde amine class.

(C) classification according to the speed of vulcanization promotion

1、Slow-speed grade: thiourea, aldehyde amine class, representative products ETU, DETU, H
2、Medium speed: guanidine, representative products DPG, DOTG
3、Quasi-speed class: thiazole, hypoxanthamide class M, DM, CZ, DZ, NOBS
4、Ultra-rapid grade: Tyuram class, representative products TMTD, TMTM, TETD
5, super speed grade: dithiocarbamates, xanthates, representative products PZ, ZDC, BZ

(D) according to the amount of market consumption or production to classify

The consumption or production is called large varieties, and the opposite is called small varieties.
1、Large varieties: thiazoles and hyposulfamates.
2、Small varieties: Tyuram, dithiocarbamates, thioureas, xanthates.

The above four types of classification is the current main classification, there are other classifications, not in one example.

On how to choose rubber accelerators, mainly from two aspects. One is the performance of the accelerator itself, such as thermal stability, too good stability is not conducive to the vulcanization of rubber, and stability is too poor to cause scorching. Second, the physical and mechanical properties of vulcanized rubber products, hardness, elasticity, tensile properties, friction properties, and thermal aging properties.

Usually two, three or more varieties are generally used. One can be the primary accelerator and the other the secondary accelerator. Ultimately, it depends on the product specifics.