Conveyor belt according to their use can be divided into general, special properties of conveyor belt, fire-retardant conveyor belt, rope belt and so on. Rubber formula design of its main points are as follows:
(A) General Conveyor Belt
General conveyor belt used in a variety of components, including rubber covered plastic, cushioning rubber, cloth, wipe rubber layer, fabric layer of paste rubber of four.
1, covering rubber
The impact by the use of materials, wear and micro-erosion, as well as various aging effects. Therefore requested to cover the adhesive has good tensile strength (≥ 18Mpa) and abrasion (wear volume ≤ 0.8cm3/1.61Km), anti-aging, anti-biological erosion. In addition, the viscosity and so requires a good technological properties, formulation design features are as follows:
Raw rubber with natural rubber-based or used the right amount of styrene butadiene rubber, including rubber rate was controlled at 50% ~ 55%. Curing system using sulfur accelerator systems of traditional tie. In natural rubber formulations, sulfur amount of about 2.5 phr; in styrene-butadiene rubber formulations, sulfur dosage is 1.5 to 2.0 phr. Commonly used accelerator M, DM, and use, Accelerator CZ, NOBS and other accelerant for the rubber-containing styrene-butadiene rubber compound. Reinforcing agent can choose a high abrasion carbon black, super-abrasion furnace black, etc., the dosage of 40 to 50 phr. Softeners are often used in a variety of oil, heavy oil, pine tar, coumarone resin and petroleum resin.
2, buffer rubber
Glue in glue and cover the buffer zone between the core layer can increase the adhesion between the two, and to absorb and disperse impact transportation of materials, have a dampening effect. Require rubber with good adhesion (adhesion plastic and cloth ≥ 3.15N/mm), elasticity, heat a small, heat is good, a good process performance.
Commonly used natural rubber, raw rubber butadiene rubber and used, including plastic rate of 50% ~ 55%. With the appropriate use of low sulfur curing system to improve the adhesive layer and the adhesion between the fabric layers. Accelerant use of M, DM, TMTD and use system. Common high abrasion carbon black and semi-reinforcing carbon black and used, dosage should not be too much, usually about 10 phr. Softeners use viscosifying better varieties, such as pine tar, coumarone and so solid.
3, wiping the glue
The main role of the eraser is to canvas with a core layer of adhesive as a whole. Require core material with good adhesion properties (adhesion between the fabric and the fabric strength of not less than 4.5N/mm), resistance to fatigue (cloth layer flex frequency ≥ 2.5 million / Full stripping), and sufficient The plasticity (plastic-degree 0.5 ~ 0.6) and anti-scorch properties of such processes.
Raw rubber with natural rubber-based, and use 20 to 30 phr SBR, including plastic rate of 50% or so. Sulfur curing system with the general to promote the agent system. Promoters commonly used M and DM and use, or by adding a small amount of TMTD, to speed up the cure rate, but to pay attention to prevent the rubber scorch. Should use semi-reinforcing carbon black carbon black or other soft carbon black, dosage of about 10 phr. Mixed with styrene-butadiene rubber eraser should be appropriately increased coumarone resin and petroleum resin amount, otherwise it will reduce the fabric layer adhesion.
4, paste adhesive
Basic and eraser similar difference is that with rubber eraser slightly higher rate than more, while the slightly smaller degree of more plastic, plastic with 0.4 to 0.5 degrees is better.
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