8. How does the structural nature of carbon black affect the properties of the rubber compound
Carbon black is produced by thermal decomposition of hydrocarbon compounds. When the raw material is natural gas (whose components are dominated by aliphatic hydrocarbons), a six-membered ring of carbon is formed; when the raw material is heavy oil (with a high content of aromatic hydrocarbons), the six-membered ring of carbon is already contained, and it is further dehydrogenated and condensed to form polycyclic aromatic compounds, thus generating a hexagonal mesh structure of carbon atoms on the level of the level of the 3-5 overlap becomes a crystal.

9. Why carbon black affects the burn-in properties of rubber compound
The structure of carbon black affects the burning time of the rubber: high structural burning time is short; the smaller the particle size of carbon black, the shorter the burning time. Surface properties of carbon black particles on the charring effect: mainly refers to the oxygen content of the surface of carbon black, high oxygen content, low PH value, acidic, such as groove black, charring time is longer. The dosage of carbon black on the charring time: the dosage can significantly shorten the charring time is to increase the generation of carbon black combined with the tendency of rubber more to promote charring. Carbon black in different vulcanization systems have different effects on the burning time of rubber Menni.

10. What is one-stage mixing and what is two-stage mixing?
One-stage mixing is to add the plasticizing rubber and all kinds of cooperating agents (for some cooperating agents which are not easy to be dispersed or in small amount can be made into masterbatch beforehand) one by one according to the requirement of the process procedure, that is to say, to do the mixing of the masterbatch rubber in the refining machine, and then to add sulphur or other vulcanizing agents and some super-promoters which are not suitable to be added into the refining machine in the film pressing machine.

11. Why should the film be cooled before storage?
The temperature of the film cut from the press is very high, if it is not cooled down immediately, it will be easy to produce early vulcanization, and it will also stick to the glue, which will cause trouble to the next process.

12. Why control the temperature of sulfur in the 100 ℃ below
This is because the mixing of rubber in the addition of sulfur and accelerator, if the temperature exceeds 100 ℃, it is easy to cause early vulcanization of rubber (i.e., scorching). In addition, at high temperatures sulfur dissolved in the rubber, cooling sulfur condensation on the surface of the rubber, resulting in frost, and will cause uneven dispersion of sulfur.

13. Why should the rubber mixing film be parked for a certain period of time before use?
After cooling the rubber mixing film is stored for four purposes: (1) so that the rubber material to restore fatigue, relax the mixing of mechanical stress; (2) reduce the shrinkage of the rubber material; (3) so that the matching agent continues to diffuse in the process of parking, to promote the uniformity of the dispersion; (4) so that the rubber and the carbon black between the rubber and the further generation of bonded rubber, to improve the effect of reinforcement.

14. Why should the dosing sequence and pressurizing time be strictly implemented?
The dosing sequence and pressurizing time are important factors affecting the mixing quality. Segment dosing can improve the mixing efficiency and increase its uniformity, and the dosing order of some chemicals has its own special regulations, so it is necessary to strictly implement the segment dosing. Pressurization time is too short rubber and chemicals can not be fully friction pinch, resulting in uneven mixing; such as pressurization time is too long and make the mixing room temperature is too high, affecting the quality, but also reduce efficiency. Therefore, the pressurization time must be strictly enforced.