Yuan Lei's Little Knowledge | (II) of Inorganic Fillers Commonly Used in Tire Rubber

Release time:

2024-01-29 09:34

Inorganic fillers commonly used in tire rubber

Tire is one of the main branches in the field of rubber. In tire rubber, the amount of rubber filler has accounted for more than 2/3 of the amount of tire rubber formula, so rubber filler is the most important compound material in tire rubber composition. At present, the tire rubber commonly used functional filler has the following:

1 Calcium sulfate

At present, calcium sulfate is mainly used for rubber modification in the form of calcium sulfate whiskers. Calcium sulfate whiskers are readily available and inexpensive, and can effectively reduce costs. Therefore, calcium sulfate whisker modified rubber has high cost performance and is particularly suitable for use as high-performance large and medium-sized truck tire sidewall rubber, which can effectively improve the environmental stress resistance of tires and make tires not easy to crack.



2 Graphite

Due to the high thermal conductivity and low friction coefficient of graphite, its heat generation in isoprene rubber vulcanizates is small. This ensures that the compound has good fatigue resistance. Isoprene rubber has good physical and mechanical properties, widely used in tire tread rubber, carcass rubber and sidewall rubber, therefore, graphite filled isoprene rubber as tire rubber can generally improve the fatigue resistance of tire products.



3 Carbon fiber

Carbon fiber as a filler can be used in many parts of the tire system, such as the sidewall, tread and bead, and its role is also different. Pneumatic tires generally have sidewalls, and it has been conventionally desired that the sidewalls have good bending fatigue resistance, scuffing resistance, and abrasion resistance. A variety of discontinuous (non-woven) fibers have been used to increase the stiffness and modulus of vulcanized rubber. At present, the bead core material used is usually steel wire or steel wire rope strand, but there are also patents in which carbon fiber is used instead of steel wire.



4 Carbon nanotubes

The unique structure of carbon nanotubes (CNTs) makes it have excellent properties such as ultra-high strength, great toughness, unique electrical conductivity and thermal conductivity. As a reinforcing agent, it can greatly improve the mechanical properties of composite materials. It can provide excellent reinforcement for rubber matrix and improve its fatigue resistance. Its thermal conductivity, tear resistance and wear resistance are excellent. Therefore, CNTs are used to fill rubber composite materials, it is of great significance to prepare tires with low rolling resistance.



5 Glass fiber

Glass fiber for rubber reinforcement is generally made of glass (I. e., alkali-free glass). If high strength is required, S glass (I. e., high strength glass) can be used. Generally, glass yarns for tires are treated with monofilaments using resorcinol formaldehyde latex as a binder to prevent mutual wear between monofilaments. Glass fiber reinforced tires are now widely used in cars and will be widely used in trucks in the future.



6 Other fillers

At present, the research on rubber fillers other than traditional fillers is mainly focused on environmentally friendly substances, such as starch, cellulose and lignin; functional substances, such as magnetic powder and metal methacrylate; waste recycling substances, such as rubber powder.

Tire, rubber, filler, with, performance, present, calcium sulfate, glass, use

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