What is Processing of rubber additives?

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1. Dispersant dispersants

It mainly improves the dispersibility of carbon black and other powders in rubber materials. They are mostly polymerized products of polymer fatty acid esters or mixtures with metal soaps. The combination of dispersant in the rubber material can speed up powder dispersion, prevent roll sticking, reduce scorch and shorten processing time. In addition to helping powder dispersion, the polymer fatty acid ester also has a plasticizing effect, and is beneficial for improving the fluidity of rubber materials.

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2. Homogenizer

The main function of the homogenizer is to solve the blending of polymers with different polarities and different viscosities. It is a mixture composed of low molecular resins with different polarities. Without affecting the mechanical properties and vulcanization properties of the rubber additives, the homogenizer not only improves the blending and stabilizing the phase structure of the polymer, but also has the functions of plasticizing, thickening and lubricating, which can improve the workability of the blend and reduce energy consumption. At the same time, it can also effectively improve the airtightness of tire lining rubber, and is a very effective processing aid.

3. Release agent Mold release agent

It is a kind of processing aid mainly used in the field of polymer molding and processing. Its main function is to make the demolding operation easy and prevent damage to the product caused by forcible removal. Mold release agents are generally divided into two types: external use and internal use. Traditional mold release agents are generally for external use, that is, applied to the surface of the mold cavity, and are customarily called isolating agents. The products mainly include talc powder, mica powder, soap, paraffin, PTFE and silicone oil, etc., which all have a certain mold release effect, but they are easy to leave mold scale and traces, corrosive to the mold, and expensive. Internal release agents are generally added in the form of additives during rubber refining, which is very convenient to use and is beneficial to the long-term maintenance of the mold. In addition, internal mold release agents also help the flow of rubber additives from China factory and reduce heat generation caused by intramolecular friction. They are truly multifunctional additives, so they are called “internal lubricants” abroad.

4. Plasticizer Plasticizer

It is a processing aid used to improve the processing performance of polymers and improve their flexibility or tensile properties. According to its mechanism of action, it can be divided into two categories: physical plasticizers and chemical plasticizers. It is customary to call physical plasticizers as softeners, and chemical plasticizers as plasticizers. The chemical plasticizer is added during the plastic production of raw rubber. Through chemical action, it not only improves the plasticizing effect, shortens the plasticizing time, and saves energy, but also has the advantages of small dosage, strong plasticizing power, and no influence on product performance. Physical plasticizer is used in rubber processing to improve the processing performance of rubber. Its addition can reduce the viscosity of mixed rubber, increase the plasticity of the cavity material, improve the dispersibility of carbon black and other compounding agent Chemicalbook, and improve the physical properties of vulcanized rubber.

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5. Adhesives Thickeners

It is a class of special additives that can improve the viscosity of raw rubber and unvulcanized adhesives. They are generally divided into two categories: cobalt salt and resin. Cobalt salt rubber adhesives include cobalt naphthanate, cobalt stearate, cobalt borate and cobalt silicate, etc., which are mainly used for bonding rubber to brass or galvanized metal, and are important raw materials for steel wire radial tires and other rubber-metal composite products. The main function of the tackifier is to improve the self-adhesive of rubber and the molding viscosity of the tire, so as to reduce the waste caused by manual painting of gasoline or glue due to the lack of adhesion of rubber, realize the linkage of tire production, and improve the production efficiency.

6. Coupling agent The coupling agent

It can effectively connect inorganic groups and organic polymers closely, so as to improve the processing performance and physical and mechanical properties of the rubber. There are many types of coupling agents. Currently, the most widely used are silane coupling agents and titanate coupling agents.

7. Reinforced polyester-reinforced resin

It is also known as reinforcement hardening resin, is used in China rubber additives materials that require high hardness, high reinforcement, and are difficult to produce due to excessive carbon black. Currently, phenolic resins are more commonly used. This resin not only has a strong interaction with carbon black and elastomers, so that rubber products obtain high mechanical properties, but also has the functions of thickening, plasticizing and softening.

8. Sprays sprays

It is usually divided into internal and external depending on where they are used on the outer tire. External sprays are divided into solvent type and water-based type. Since solvent-based external sprays are harmful to humans, they are now largely unused. The water-based external spraying agent gives tires good pigment identification ability, has flame retardancy, no pollution, can increase the cleaning cycle of the mold and reduce equipment investment, so it is widely used. The main function is to make the outer tire easy to remove the mold, facilitate the vulcanized capsule to be pulled out of the inner cavity of the outer tire, improve the quality of the tire inside and the appearance, and improve the product qualification rate.

9. Anti-coke agent & Anti-coke agent

It is an additive that vulcanizes early during storage and processing, and can significantly improve the storage stability and rolling safety of vulcanized rubber materials at high temperatures.

10. Other types of additives The rubber industry

in addition to demanding on the function and technical content of additives, also places higher demands on the environment and health. This is a characteristic of modern rubber processing technology, and the need for modern additives to win the market. New additives such as granulation, surface treatment and pre-dispersing show a new level of modern additives.

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