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Relationship between curing time, temperature and accelerator

Excellent formula should choose the best upper limit which is most suitable for rubber vulcanization temperature, the least amount of accelerator and the shortest vulcanization time. These three main aspects are considered.

At present, there are many rubber factory processes in China to produce molded products with a thickness of less than 8MM. The use of four DM-M --- TMTD-D accelerators is an excellent formula. His advantages are flat vulcanization curve and scorch Long time, easy to control and difficult to spray frost.

DM as the first accelerator is determined by the entire vulcanization process, and the amount of DM is the most among the four accelerators, and it is determined by some physical properties of rubber. Under normal circumstances, it should not increase or decrease.

A smaller amount of M can increase the vulcanization speed and is used as a second accelerator. In the vulcanization process, it and DM both inhibit each other and activate each other. This combination plays a key role in controlling the vulcanization rate. And it is a plasticizer, which is beneficial to the plasticization of rubber molecules.

TMTD is the third accelerator. It is a super-accelerator for accelerating the vulcanization speed. The general dosage is not more than 10% of DM. Accelerator D itself is a medium-speed accelerator. Vulcanization speed is not fast when single use, generally used for thick products. However, it is an alkaline accelerator, which can be activated quickly when used in combination with DM and M, and the vulcanization speed is immediately accelerated. As an auxiliary accelerator, it is mainly used as an activator to control the vulcanization speed. Generally does not exceed 20% of DM. It is adjusted together with TMTD when regulating sulfur speed.

TMTD decomposes M at high temperatures to rapidly activate D / DM. The solubility of different accelerators in rubber is different. The combined use of such multiple accelerators can reduce the amount of single accelerator. It plays a key role in controlling the blooming of accelerators in rubber products. It also greatly facilitates the adjustment of the vulcanization speed. Different physical properties, different scorch, different vulcanization time, use different accelerators. Blindly increasing the vulcanization temperature to speed up the vulcanization is the most stupid way.

With the best vulcanization temperature and reasonable use of accelerators, formulas with fast vulcanization speed and good physical properties can still be designed. In daily production, if you want to pursue rapid vulcanization below 1 to 5 minutes, you can use M / H or M The combined use of / TS requires DM / D / TMTD for general scorch and faster sulfur speeds below 3 minutes, and DM / M / TMTD for 4-5 minutes or less. Similar combinations are endless. The optimal vulcanization time is not arbitrary. It is calculated based on the thickness of the product and the vulcanization temperature. I do n’t talk about it in the calculation formula book. It can also be estimated by practical experience. More than 6MM can be calculated as T90 + (m-6) minutes. In addition to producing an excellent product, a reasonable and excellent formula is required. It is equally important in terms of curing time, temperature, pressure and production process factors.