Composite fiber modified nylon material and preparation method thereof

Abstract

The invention discloses a composite fiber modified nylon material and a preparation method thereof. The composite fiber modified nylon material comprises the following components in percentage by weight: 50% to 70% of nylon, 29% to 50% of composite fibers, 1% to 20% of addition agent, wherein the composite fibers comprise glass fibers and polyimide fibers; the percentage by weight of the glass fibers to polyimide fibers is (1 to 9) to 1. Composite fiber is formed by the glass fibers and the polyimide fibers so as to modify the nylon. Therefore, the modified nylon material which has the advantages of strong intensity, excellent stability and excellent fatigue resistance is obtained, the defects that products are easy to deform and warp due to glass fibers are overcome by the polyimide fibers, the glass fibers enable the usage amount of the polyimide fibers to be reduced, and the cost is reduced. The preparation method mainly comprises two steps: mixing and performing melt extrusion, the technology is simple, complex equipment is not required to be added, the cost is low, the performance of composite high polymer materials is improved, and the composite fiber modified nylon material is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of engineering plastics, and in particular relates to a composite fiber modified nylon material and a preparation method thereof. Background technique [0002] With the miniaturization of automobiles, the high performance of electronic and electrical equipment, and the acceleration of the lightweight of mechanical equipment, the demand for nylon (PA) will greatly increase. In particular, as a structural material, PA has high requirements for its strength, heat resistance, and cold resistance. However, pure PA materials have the disadvantages of strong polarity, strong hygroscopicity, and poor dimensional stability. [0003] It has been reported that adding about 30% glass fiber to PA will significantly improve the mechanical properties, dimensional stability, heat resistance and aging resistance of PA, among which the fatigue strength is 2.5 times that before adding glass fiber . However, in the molding p...

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Problems solved by technology

However, in the molding process of glass fiber reinforced PA, due to poor fluidity, higher injection pressure, injection speed and injection temperature are required; in addition, because the glass fiber will be oriented along the flow direction during the injection molding process, it will cause mechanical properties and shrinkage. The ratio is enhanced in the orientation direction, resulting in easy deformation and warping of the product; if the proportion of glass fiber added is large, it will also cause greater wear on the plasticizing components of the injection molding machine

[0004] It is also reported that PA is enhanced by adding other high-performance fibers, such as polyimide fibers. Since the price of polyimide fibers is not advantageous, the production cost of modified PA is relatively high.

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