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(1) Prevent the products from generating air bubbles during the vulcanisation process and improve the densification of the rubber material. The moisture and other volatile substances contained in the rubber during vulcanisation, as well as the hydrogen sulphide gas that may be formed during the vulcanisation reaction, will be volatilised and escaped at high temperatures, resulting in air bubbles in the rubber. If the vulcanisation pressure is greater than the internal pressure of the rubber may produce the escape of the vulcanisation pressure, it can prevent the production of air bubbles and improve the densification of the rubber.
(2) so that the rubber is easy to flow and fill the mould cavity. In order to produce a clear pattern, full of products, the rubber must be able to flow and fill the mould cavity. Especially the rubber in the uncrosslinked state of the vulcanisation induction period, the role of vulcanisation pressure is more obvious.
(3) Improve the densification of the rubber and improve the adhesion between the rubber and the skeleton material. During vulcanisation, with the increase of vulcanisation pressure, the depth of rubber penetration into the cloth layer increases, thus improving the adhesion between rubber and cloth layer and the flexural properties of the products.
(4) Helps to improve the physical and mechanical properties of vulcanised rubber. Tests show that, with the increase of vulcanisation pressure, some physical and mechanical properties of vulcanised rubber such as strength, fatigue resistance, wear resistance and other corresponding improvement. However, too high vulcanising pressure on the performance of rubber will also be unfavourable, this is because high pressure, like high temperature, will accelerate the thermal degradation of rubber molecules, but make the performance of the rubber material decline. Excessive pressure is also very demanding on the equipment, causing more damage to the equipment and higher power costs. Vulcanisation pressure should be selected according to the formulation of the compound, plasticity of the compound, product structure and process. The general principle is that the plasticity of the rubber material is large, the vulcanising pressure should be small; the product is thick, the number of layers, the structure is complex, the vulcanising pressure should be small.
The general principle is that the plasticity of the rubber is large, the vulcanising pressure should be small; thick products, more layers, complex structure, vulcanising pressure; thin products, vulcanising pressure should be low, or even available at room temperature vulcanisation.
(2) so that the rubber is easy to flow and fill the mould cavity. In order to produce a clear pattern, full of products, the rubber must be able to flow and fill the mould cavity. Especially the rubber in the uncrosslinked state of the vulcanisation induction period, the role of vulcanisation pressure is more obvious.
(3) Improve the densification of the rubber and improve the adhesion between the rubber and the skeleton material. During vulcanisation, with the increase of vulcanisation pressure, the depth of rubber penetration into the cloth layer increases, thus improving the adhesion between rubber and cloth layer and the flexural properties of the products.
(4) Helps to improve the physical and mechanical properties of vulcanised rubber. Tests show that, with the increase of vulcanisation pressure, some physical and mechanical properties of vulcanised rubber such as strength, fatigue resistance, wear resistance and other corresponding improvement. However, too high vulcanising pressure on the performance of rubber will also be unfavourable, this is because high pressure, like high temperature, will accelerate the thermal degradation of rubber molecules, but make the performance of the rubber material decline. Excessive pressure is also very demanding on the equipment, causing more damage to the equipment and higher power costs. Vulcanisation pressure should be selected according to the formulation of the compound, plasticity of the compound, product structure and process. The general principle is that the plasticity of the rubber material is large, the vulcanising pressure should be small; the product is thick, the number of layers, the structure is complex, the vulcanising pressure should be small.
The general principle is that the plasticity of the rubber is large, the vulcanising pressure should be small; thick products, more layers, complex structure, vulcanising pressure; thin products, vulcanising pressure should be low, or even available at room temperature vulcanisation.
