耐热输送带在使用过程覆盖胶的配方

Formula for covering adhesive in use of heat resistant conveyer belt

1、主要原材料丁苯橡胶(SBR)，供应耐热输送带，；炭黑N330，氧化锌，三水耐热输送带，促进剂NOBS和TMTD，硫黄，防老剂RD和BLE，

1, the main raw materials of styrene butadiene rubber (SBR), the supply of heat resistant conveyor belt, black N330, Zinc Oxide, Sanshui; heat resistant conveyor belt, accelerator NOBS and TMTD, sulfur, antioxidant RD and BLE,

2、普通输送带覆盖胶通常以天然橡胶为主，并用少量SBR。耐热输送带覆盖胶通常采用SBR，对于要求较高的输送带可采用三元乙丙橡胶(EPDM)。根据生产经验和用户使用情况，EP—DM覆盖胶耐热氧老化性能很好，但炭化层形成速度较慢，且覆盖胶与带芯结合不好。SBR覆盖胶耐热氧老化性能较好，炭化层形成速度较快，因此确定覆盖胶主体材料为SBR。

2, ordinary conveyor belt cover is usually based on natural rubber, with a small amount of SBR. SBR is usually used for heat resistant conveyor belt covering, and three ethylene propylene rubber (EPDM) can be used for high required conveyor belts. According to the production experience and user's usage, the EP DM covering rubber has good heat and oxygen aging performance, but the carbonization layer is formed slowly, and the covering rubber is not well combined with the core. The heat - oxygen aging property of SBR covering adhesive was better, and the carbonization layer was formed faster. Therefore, the main material of covering adhesive was SBR.

3．硫化体系采用普通硫黄硫化体系，阻燃耐热输送带，胶料中含有较多的多硫键，使胶料在热氧老化阶段性能下降过快，没等形成炭化层就失去使用价值。而采用硫黄给予体，胶料中单硫键和双硫键占90以上，胶料热氧老化阶段性能下降不大，能够形成炭化层。硫黄和促进剂TMTD用量对覆盖胶性能的影响如从表1可以看出，当硫黄和促进剂TMTD用量分别为0．2和2．3份时，覆盖胶综合物理性能较好，炭化层寿命最长。此外，为使炭化层龟裂均匀，还应提高胶料的导热性能，因此适当提高氧化锌用量，通过试验确定氧化锌用量为l9份。

3. vulcanization system using conventional sulfur curing system, flame retardant and heat resistant conveyor belt, multi disulfide containing more rubber, the rubber material performance in hot oxygen aging stage fell too fast, no other form of charring layer will lose value. The sulfur donor, rubber single disulfide bonds and disulfide bonds accounted for more than 90, the rubber thermal oxidative aging stage performance drops slightly, can form the charring layer. Sulfur and accelerator effect of TMTD dosage on the cover properties as seen from table 1, when the sulfur and accelerator TMTD were 0.2 and 2.3, better comprehensive physical properties of rubber cover, the charring layer has the longest life. In addition, in order to make the carbonization layer crack even, the thermal conductivity of the rubber should also be improved. Therefore, the amount of Zinc Oxide should be increased appropriately, and the Zinc Oxide dosage should be L9 parts.