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New uses of milled glass fiber

   milled glass fiber powder is made by grinding glass fiber precursor with hammer mill or ball mill. The average length of the fiber is 30-300 μ M. under the microscope, the cross-sectional area of the fiber is cylindrical. In China, milled glass fiber powder is usually calibrated by fiber length and fiber diameter. For example, emf-200 refers to the milled fiber with an average diameter of 11-13 μ m and an average length of 30-300 μ M.

   With the rapid development of science and technology, the application field of foreign milled glass fiber powder is expanding, and the annual output is also increasing. At present, there are more than 20 companies in production, of which the annual production capacity of OCF company in the United States reaches 3300 tons, which occupies a leading position in the international market.
At present, milled glass fiber powder is mainly used as high performance friction material in China.
The traditional filler of friction material is asbestos. However, it is reported that asbestos is carcinogenic. In recent years, the international market has resisted asbestos containing friction materials, which provides a broad market for milled glass fiber powder.
The milled glass fiber used as friction material is treated by surface chemical treatment to accelerate the penetration of resin and meet the requirements of special molding performance and product performance. There are three specifications of emf-200, emf-250 and emf-300. The corresponding fiber length ranges are 110-80 μ m, 80-50 μ m and 50-30 μ M.
The friction material with milled glass fiber powder not only has high friction coefficient, but also has durability and thermal stability. When it contacts with the close parts (such as rotor), it only produces slight noise and reduces the wear of the friction parts to the minimum.
This kind of high performance friction material can be widely used as brake pad and clutch plate of automobile, brake shoe of passenger and freight car, railway locomotive and various drilling rig, friction block of stamping equipment and engineering Mining machinery, and cone brake ring of hoisting machinery.
Milled glass fiber can also be used as functional filler of ABS plastics to modify ABS plastics and meet the requirements of plastic processing and product application performance.
When a factory is producing the parts such as the bottom plate and cover plate of the automatic washing machine, because it is made of pure ABS plastic, the surface of the bottom plate and the cover plate is seriously warped and deformed, the size of the parts is not stable, and the screw hole nail is slipping, so many finished products are scrapped because they can not be assembled. Later, milled glass fiber powder was used to fill ABS plastics, which made the plastic modified: the shrinkage rate was reduced from 1% to 2% to 0.4% to 0.5%. When the self tapping screw was screwed, there was no slippage and cracking. At the same time, the surface and parts made were flat, straight and warped. The processing performance of the plastic was good.
In addition, adding milled glass fiber powder into the laminate can improve the crack resistance and wear resistance of the laminate, reduce the shrinkage of the laminate, and improve the laminate strength. At the same time, it can improve the bending modulus and compression modulus of the laminate.
When the resin mixture of milled glass fiber powder is used in the mold, the defects on the outer surface can be leveled, the edges and corners of the mold structure can be rounded, and the reinforcing rib coated with glass cloth which is pre connected to the outside of the mold structure can also be rounded.
After cured with milled glass fiber powder reinforced resin, the hardness of the product is higher, and its thermal expansion performance is similar to that of hand laid FRP reinforced with glass cloth, and the product is not easy to crack.
The wet strength of the resin can be improved by using both surfactant and milled glass fiber powder in the resin system, which can reduce water absorption and increase the retention rate of wet strength.

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