There are a wide variety of Rubber Processing Additive, but the production process is basically the same. The basic process of Rubber Processing Additive with general solid rubber as raw materials includes: plastic refining, mixing, calendering, pressing, forming and vulcanization of 6 basic processes. Of course, raw material preparation, finished finishing, inspection packaging and other basic processes are also indispensable. The process of rubber processing is mainly to solve the contradiction between plastic and elastic properties. Through a variety of technological means, so that elastic rubber into a plastic plastic rubber, and then add a variety of additives made of semi-finished products, and then through the vulcanization of plastic semi-finished products have become high elasticity, physical and mechanical properties of good Rubber Processing Additive.
1. The main raw material for Rubber Processing Additive is the basic material, and raw materials are grown in tropical, subtropical rubber tree on the tree by artificially cut the bark collected.
2. A variety of coordination agents are intended to improve the performance of Rubber Processing Additive and add auxiliary materials.
3. Fiber materials (cotton, hemp, wool and a variety of man-made fibres, synthetic fibres and metal materials, steel wire) is used as a rubber product skeleton material to enhance mechanical strength, limited product variants. In the raw material preparation process, the ingredients must be accurately weighed according to the formula. In order to make the raw rubber and the coordination agent can mix evenly, the material needs to be processed. The raw rubber should be baked in the 60--70℃ drying room and then cut gum, broken into small pieces, with a block of agent. such as paraffin, stearic acid, rosin, etc. to be crushed. If the powder contains mechanical impurities or coarse particles need to be filtered to remove liquid such as pine tar, Coumarone needs heating, melting, evaporation of water, filter impurities, the coordination agent to be dry or easy to caking, mixing if not dispersed uniform vulcanization when the bubble will affect product quality.
The rubber is flexible and lacks the necessary plasticity in processing, so it is not easy to process. In order to improve its plasticity, it is necessary to carry on the plastic refining of the rubber, so that in the mixing agent will easily disperse evenly in the raw rubber, at the same time in the calendering, molding process will also help improve the permeability of the plastic material infiltration into the fiber fabric and molding mobility. The process of degrading the long chain molecule of the rubber to form plasticity is called plasticizing. There are two kinds of methods of rubber and plastic refining, such as mechanical and thermoplastic. Mechanical plastic refining is at a low temperature through the mechanical extrusion and friction of the role of plastic smelting machine to shorten the molecular degradation of long chain rubber from high elastic state to plastic state. Hot-plastic smelting is to the raw rubber into the hot compressed air under the action of heat and oxygen to shorten the long chain molecule degradation to obtain plasticity.
In order to adapt to different conditions of use, to obtain a variety of different performance, but also to improve the performance of Rubber Processing Additive and reduce costs must be in the raw materials to add different additives. Mixing is the process of mixing the rubber with the mixture, placing the mixture in the rubber mixing machine, and dispersing the mixture completely and evenly in the raw rubber by mechanical mixing. Mixing is an important process in the production of Rubber Processing Additive, if mixing uneven can not give full play to the role of rubber and coordination agents affect the performance of products. After mixing the rubber material that people call mixing rubber it is to manufacture a variety of semi-finished materials, commonly known as Rubber Processing Additive are usually sold as a commodity buyers can use the rubber material directly processing molding, vulcanization made of the required Rubber Processing Additive. According to the different formula? The mixed rubber has a series of different grades and varieties of performance. Provide a choice.
In the production process of Rubber Processing Additive, the use of calender or press out of a variety of shapes, different sizes of the process? called forming. The Molding method has
1. Calendering Molding
It is suitable for making simple flake and plate-like products. It is the process of mixing rubber through the calender into a certain shape, a certain size of the film is called Calendering molding. Some Rubber Processing Additive? such as tires, blankets, hose and other textile fiber materials used must be coated with a thin layer of glue on the fiber is also called adhesive or rub glue? The gelatinize process is usually done on the calender. The purpose of fiber material drying and dipping before calendering is to reduce the water content of the fiber material so as to avoid evaporation and foaming of moisture. And to improve the temperature of the fiber material to ensure the quality of calendering process. Dipping is the necessary process before the adhesive is used to improve the bonding properties of the fiber material and the binder.
2. Press out Molding
For more complex Rubber Processing Additive? such as tire tread, rubber hose, metal wire surface plastic coating needs to be produced by pressing out the molding method. It is to put a certain plastic mixing rubber into the extruder hopper inside the screw extrusion through a variety of mouth also known as a model for continuous modeling method. Before pressing out, the adhesive must be preheated to make the rubber material soft and easy to extrude to obtain a smooth surface and accurate size.
can also use the molding method to make some shape complex such as leather bowl, sealing ring of Rubber Processing Additive? With the help of the molding yin, yang Mold will be placed in the mold of plastic heating molding.