In industrial scenarios such as metallurgy, chemical engineering, and waste incineration, when transporting high-temperature materials (such as sintered ore, slag, and hot castings), ordinary conveyor belts may soften, crack, or even burn due to high temperatures. However, high-temperature resistant conveyor belts, with their special material design and structural optimization, have become the core equipment for such working conditions. The temperature tolerance of high-temperature resistant conveyor belts is not a fixed value, but presents a gradient distribution based on material differences, ranging from 100 ℃ to 1200 ℃. The realization of their temperature resistance performance is closely related to substrate selection, structural design, and application scenarios.

According to the temperature resistance level, high-temperature conveyor belts can be divided into three categories: medium temperature, high temperature, and ultra-high temperature. The suitable temperature for medium temperature conveyor belts is usually between 100 ℃ and 150 ℃. These products often use chloroprene rubber or nitrile rubber as cover rubber, and add heat-resistant fillers such as iron oxide and zinc oxide to maintain the stability of rubber molecular chains at high temperatures. The core is mostly made of polyester cotton canvas or nylon canvas, which can be treated with heat-resistant resin to prevent fiber degradation in humid and hot environments. Medium temperature conveyor belts are widely used for cooling and conveying after food baking, as well as hot air drying in fertilizer production. They can maintain a service life of more than 3 years when intermittently exposed to materials at 150 ℃.

The temperature resistance range of high-temperature conveyor belts has been extended to 150 ℃ -300 ℃, and its core technology lies in the upgrading of the substrate. EPDM (Ethylene Propylene Diene Monomer) is commonly used as the covering rubber. This type of rubber has a molecular structure without double bonds, and its heat oxidation resistance is increased by more than 50% compared to ordinary rubber. It can maintain good elasticity even when running continuously at 200 ℃. For scenarios that require contact with materials above 250 ℃, aramid fiber canvas is used as the core, which has much higher temperature resistance than traditional fibers and a strength loss rate of less than 10% at 300 ℃. The continuous casting billet transportation in the steel industry is a typical application case. High temperature conveyor belts need to withstand repeated temperature shocks from 300 ℃ to room temperature. Solid lubricants such as graphite powder are added to the surface of the covering rubber to reduce the adhesion and wear of hot materials on the belt body.

The ultra-high temperature conveyor belt is designed for extreme environments above 300 ℃ and can withstand up to 1200 ℃ of instantaneous high temperature. The structure of these products is significantly different from traditional conveyor belts, and the substrate is mostly made of stainless steel mesh belts or ceramic fiber composite materials. Stainless steel mesh belt is woven from 310S heat-resistant steel (containing 25% chromium and 20% nickel), which can maintain mechanical properties for a long time below 800 ℃. It is commonly used for conveying slag after garbage incineration; The ceramic fiber conveyor belt is made of aluminum silicate fiber cloth as the substrate, coated with a high-temperature curing coating on the surface, and can complete material transportation in kilns above 1000 ℃, such as the transportation of ceramic bodies during the firing process. It is worth noting that the temperature resistance of ultra-high temperature conveyor belts needs to distinguish between "continuous temperature" and "instantaneous temperature". For example, a certain type of ceramic conveyor belt can withstand an instantaneous high temperature of 1200 ℃, but the continuous operating temperature needs to be controlled below 800 ℃, otherwise the strength will decrease due to fiber oxidation.

The factors that affect the actual temperature resistance of high-temperature conveyor belts include not only the material itself, but also the material contact method and environmental conditions