Yuan Lei's Little Knowledge | Application of Wet Mica Powder in Rubber

Release time:

2024-06-19 14:42

Yuan Lei's Little Knowledge | Application of Wet Mica Powder in Rubber

Wet mica powder is widely used, not only in coatings but also in rubber. Below, the editor will take you to understand the application of wet mica in rubber.

Improving the airtightness of rubber

The airtightness of rubber is the primary performance for many rubber products, such as inner tubes, balloons, and many life-saving equipment. To improve the airtightness of rubber, in addition to processing and coating processes, it mainly depends on the properties of the rubber itself and its fillers. The better the density of rubber, the better the anti permeability of the product. Of course, this type of adhesive is expensive, and there is a cost issue here. Therefore, using functional filler wet mica powder has a low cost and good effect, and its significance is particularly important.

The barrier effect of wet mica powder makes it difficult for harmful substances to enter the material, and after entering, it is difficult to diffuse, migrate, and penetrate. The principle is similar to that of coatings, that is, parallel oriented mica powder crystals block the passage of gas, which is very important for the inner tube of tires, the inner liner of balls, and many life-saving equipment. In terms of specifications, there is no strict requirement for fineness or whiteness, but a perfect sheet-like structure is required.

In short, after adding wet mica powder to the rubber, the airtightness will be greatly improved.

Improving the physical and mechanical properties of rubber

The addition of high aspect ratio fillers (wet mica powder) to rubber significantly improves its impact resistance, mechanical strength, and morphological stability. Wet mica powder can also change the friction characteristics of rubber, and different uses have different effects, such as increasing the friction coefficient or improving lubrication performance (such as wipers).

After adding high aspect ratio fillers, the physical properties such as elastic modulus of rubber are greatly improved, which is very important for materials such as rubber.

Insulation performance

Mica has extremely high resistance, and it is widely known to use mica powder to improve the insulation performance of materials. One of the uses of rubber is as an insulation material for wires and cables, and the use of wet mica powder is an important means. It should be mentioned that cables used in mines, tunnels, and similar situations need to be insulated in case of fire. A special type of insulation material has been developed abroad, which is composed of silicone rubber and mica powder. This type of insulation material is converted into a ceramic like substance at high temperatures in a fire, retaining good insulation performance and mechanical strength, which can keep the cable insulated in the event of a fire. It should also be mentioned that the iron content will reduce the insulation performance of mica, and dry mica powder is generally not suitable for insulation materials.

Shock absorption and sound insulation effect

Many sound insulation and vibration reduction materials use rubber to change the physical properties such as viscoelasticity of the material, forming an ideal effect. The wet mica powder with a large diameter to thickness ratio can change a series of physical moduli of the material. Furthermore, the energy reflection between chips also absorbs and weakens this energy. Based on this, the damping pads used in vehicles and household appliances are often mixed with mica powder. Similarly, many other vibration and sound insulation materials also use wet mica powder.

Release agents in rubber molding and vulcanization

In many cases, rubber molding and vulcanization do not use metal molds or similar molds, and the performance of the release agent directly affects production. For example, the use of airbags in tire molding and vulcanization, if high-performance release agents are not used, will inevitably cause adhesion between the product and the mold, which not only damages the mold but also causes a large number of defective products, posing a great threat to production.

This type of release agent often uses materials such as lubricating grease, organic silicon, and organic fluorine. Due to the indispensable role played by solid lubricants, modern release agents of this type are generally added with mica powder. Wet mica powder has a perfect sheet-like crystal shape, with extremely thin chips that have extremely high covering and isolation capabilities on the surface of the mold. Moreover, the surface of wet mica powder chips is extremely smooth, which can effectively prevent adhesion between materials. The purity of wet mica powder is high, causing extremely low levels of harmful impurities in the bonding between rubber and molds, making it very suitable. Impurities such as quartz, feldspar, and other mineral powders, which have no sheet-like structure and rough surfaces, are one of the important reasons for the difficulty in demolding. Another reason for the difficulty in demolding caused by dry mica powder is that the surface of the mica particles themselves is very rough, causing adhesion. After adding wet mica powder, a channel for gas discharge is formed between the rubber and the mold to prevent gas retention in this gap, thereby improving the appearance of the product.

Similarly, wet mica powder is also a key component of high-end lubricants. Wet mica powder can inhibit the migration of rubber additives within the rubber.

The application of wet mica powder in rubber goes far beyond this. By fully utilizing the unique properties of wet mica powder, many valuable new rubber products can be developed, forming many valuable application technologies.

Wet mica powder,Mica powder,rubber,application,Insulation performance

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