Generally, the rubber materials used for various components of the high temperature resistant conveyor belt include four kinds of covering rubber, buffer rubber, cloth layer rubbing glue, and cloth layer sticking glue.
The first kind: covering glue
High temperature resistant conveyor belts are subject to material impact, abrasion, microbial erosion, and various aging effects when used. Therefore, the cover rubber is required to have good tensile strength (≥18Mpa) and wear resistance (abrasion amount 0.8cm3 / 1.61Km), resistance to aging and biological erosion. In addition, it also requires good viscosity and other process performance. The formula design points are as follows: Baoding Huayue Tape Co., Ltd. raw rubber is mainly natural rubber or a suitable amount of styrene-butadiene rubber. The vulcanization system adopts the traditional coordination system of sulfur and accelerator. In the natural rubber formula, the amount of sulfur is about 2.5 parts by mass; in the styrene-butadiene rubber formula, the amount of sulfur is 1.5 to 2.0 parts by mass. The accelerator is generally used in combination with M and DM. The accelerator CZ, NOBS and other after-effect accelerators are suitable for rubber compounds containing styrene-butadiene rubber. Reinforcing agent can choose high wear-resistant carbon black, medium and super wear-resistant carbon black, etc., the dosage is 40 ~ 50 parts by mass. Softeners commonly used varieties of organic oil, heavy oil, pine tar, Gumaron resin and petroleum resin.
The second kind: buffer rubber
Conveyor belt buffer rubber between the cover rubber and the belt core layer can increase the adhesive force of the two, and can absorb and disperse the impact force of the conveyed materials and play a buffering role. The rubber compound is required to have good adhesion (adhesive force between adhesive and cloth ≥3.15N / mm), high elasticity, low heat generation, good heat dissipation and good process performance.
Raw rubber generally uses natural rubber and butadiene rubber in combination, with a rubber content of 50% to 55%. The vulcanization system should use low sulfur compound to improve the adhesion between the adhesive layer and the cloth layer. The accelerator uses M, DM, TMTD combination system. Carbon black is commonly used in combination with high wear resistance and semi-reinforced carbon black, and the amount should not be excessive, usually about 10 parts by mass. Softeners with better viscosity are selected, such as pine tar and solid Gumalon.
The third kind: rub glue
The main function of high temperature resistant conveyor belt rubbing glue is to bond the core canvas layer into a whole. It is required to have good adhesion to the core material (the adhesion strength between the cloth and the cloth is not less than 4.5N / mm), fatigue resistance (the number of times the cloth layer is flexed ≥ 25,000 times / full stripping), and there must be sufficient The plasticity (plasticity 0.5 ~ 0.6) and scorch resistance and other technological properties.
The fourth kind: raw rubber is mainly natural rubber, and 20-30 parts by mass of styrene-butadiene rubber is used, and the rubber content is about 50%. The vulcanization system is the same as the general sulfur and accelerator system. The accelerator is generally used in combination with M and DM, or a small amount of TMTD is added to speed up the vulcanization speed, but care should be taken to prevent scorching of the rubber compound. Carbon black should use semi-reinforcing carbon black or other soft carbon black, and the dosage is about 10 parts by mass. The rubbing compound mixed with styrene-butadiene rubber should increase the amount of Gumaron resin and petroleum resin, otherwise it will reduce the adhesion of the cloth layer.