A kind of injection molding method of long glass fiber reinforced nylon 66 material

Abstract

An injection moulding method of long glass fiber reinforced nylon 66 materials comprises the steps of raw material preparing, mixing, raw material dehumidifying, injection moulding, cooling forming and workpiece tempering in sequence. In the step of injection moulding, mixed particle materials which are subjected to dehumidifying in the second step are placed to an injection moulding machine for melting, the portion between the tail end of the injection moulding machine to a jetting mouth is divided into five sections of temperature grades, temperature is controlled between 210-320 DEG C, so that the mixed particle materials are molten, then glue jetting is carried out slowly in a one-section or subsection mode through the injection moulding machine, the molten materials are added into a product mould in an injection-moulding mode, and the mould for injection moulding is kept under the constant temperature of 120 DEG C. According to the injection moulding method of the long glass fiber reinforced nylon 66 materials, under the situation that cost is not changed greatly, the fatigue resistance of a product is improved, and the service life of the product is prolonged. Meanwhile, according to the material formula used in the scheme, product tenacity can be effectively improved, and surface effect is good.

Description

technical field [0001] The invention relates to the technical field of composite material manufacturing, in particular to an injection molding method of long glass fiber reinforced nylon 66 material. Background technique [0002] At present, glass fiber reinforced nylon 66 composite materials are widely used in sports and leisure equipment, electronic devices, auto parts and other fields due to their low cost, good formability and high mechanical properties. Injection molding process is one of the main production methods of this kind of composite material. Most of the pellets used in this method are short glass fiber pellets. Without reinforcement, the mechanical properties of the product are not high. Long glass fiber reinforced nylon 66 has better reinforcement effect and dimensional stability, and the manufactured products have better rigidity, tensile strength, bending resistance, impact resistance and fatigue resistance, and longer service life, and can be applied to s...

AI Technical Summary

Problems solved by technology

Long glass fiber reinforced nylon 66 pellets are difficult to control the injection molding process due to the long fiber length and poor melt fluidity

[0003] When long glass fiber reinforced nylon 66 pellets are used instead of short glass fiber pellets for injection molding, the fluidity of the melt becomes poor, the long glass fibers are easy to break in the cavity, and floating fibers and delamination are prone to occur during the injection molding process. , the surface quality of the prepared product is poor, and the product is easily deformed

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