High-property long glass fiber reinforced nylon 66 composite material and preparation process thereof

Abstract

The invention relates to a high-property long glass fiber reinforced nylon 66 composite material and a preparation process thereof. The high-property long glass fiber reinforced nylon 66 composite material is prepared from the following raw materials by mass percent: 66.50%-80% of low-viscosity nylon, 20%-50% of special long glass fibers, 5%-8% of a compatilizer, 0.3%-1.0% of a special nylon 66 rheology modifier, 0.3%-0.5% of silicone powder and 0.3%-0.5% of calcium stearate. The preparation process comprises the main steps: manufacturing a special die and a special drying box; selecting liquid glue to bind glass fibers; weighing the nylon 66, the special nylon 66 rheology modifier, the silicone powder and calcium stearate; uniformly mixing; realizing a molten state under the effect of a single-screw extruder; feeding the molten mixture into a cavity of a die special for long glass production at a constant speed; immersing together with the long glass fibers which are dried and pulled into the cavity of the die; pulling out the immersed glass fibers under the traction of a tractor at the regular speed; feeding into a special granulator for granulation.

Description

technical field [0001] The invention relates to the field of plastic modified materials, and specifically discloses a high-performance long glass fiber reinforced nylon 66 composite material and a preparation process thereof. Background technique [0002] Short fiber-reinforced thermoplastic composites, or fiber-reinforced materials of the traditional concept, have greatly improved mechanical properties compared with unreinforced materials, and at the same time have the dual advantages of reducing material costs, so they are used for reinforcement modification of most materials. Such as polypropylene, nylon, polyphenylene sulfide, polyoxymethylene, PET, PBT, etc. However, the mixing of these materials adopts the process of twin-screw melt mixing, and the fibers are broken in a large number in the screw, and the length of the fibers retained in the product after molding is very small, and the effect of fiber reinforcement and modification is very limited. How to increase the...

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Problems solved by technology

However, the mixing of these materials adopts the process of twin-screw melt mixing. The fibers are broken in a large number in the screw, and the length of the fibers retained in the product after molding is very small, so the reinforcement and modification effect of the fibers is very limited.