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Cable coating method-based hemp fiber-reinforced thermoplastic composite material and preparation method thereof

A technology for enhancing thermoplastic and cable coating, which is applied in the field of production and preparation of hemp fiber composite materials, can solve the problems of limited strength of hemp fiber bundles, high cost, broken strips, etc., and achieves the effect of reducing restrictions and improving production efficiency

Inactive Publication Date: 2017-05-31
ZHEJIANG PRET NEW MATERIALS +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, hemp fiber raw materials need to be specially combed into bundles, the process is complicated, the cost is high, and it is not conducive to continuous production
Although the hemp fiber bundles are fully infiltrated by the thermoplastic resin with a certain viscosity by external force, the cohesion between the fibers is weak due to the overlapping of fibers of different lengths, resulting in limited strength of the hemp fiber bundles, which may cause fractures. Strip phenomenon, unable to adapt to high-speed production

Method used

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  • Cable coating method-based hemp fiber-reinforced thermoplastic composite material and preparation method thereof
  • Cable coating method-based hemp fiber-reinforced thermoplastic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 100 parts by weight of polypropylene, 1.35 parts by weight of antioxidant, 0.9 parts by weight of light stabilizer, 3 parts by weight of toughening agent and 0.1 part by weight of crosslinking agent are fed from the main feed port in proportion, and the aspect ratio is 45: 1. Melt, mix and disperse in a twin-screw extruder, extrude and granulate, and the processing temperature (from the feed port to the die head) is 150°C, 190°C, 200°C, 220°C, 230°C, 230°C, 230°C and 235°C, the host speed is 350rpm.

[0039] The 6 strands of ramie yarn 1 are respectively drawn out from the bobbins, subjected to the drying process, then arranged in parallel and merged into one strand to be introduced into the melt impregnation die head, covered and impregnated with melted modified polypropylene resin, the processing temperature is 230°C, and the drawing speed is 20m / min, the long ramie fiber reinforced pellets are prepared by pultrusion process, and the fiber weight content is about 30%....

Embodiment 2

[0041] 100 parts by weight of polypropylene, 1.35 parts by weight of antioxidant, 0.9 parts by weight of light stabilizer, 3 parts by weight of toughening agent and 0.1 part by weight of crosslinking agent are fed from the main feed port in proportion, and the aspect ratio is 45: 1. Melt, mix and disperse in a twin-screw extruder, extrude and granulate, and the processing temperature (from the feed port to the die head) is 150°C, 190°C, 200°C, 220°C, 230°C, 230°C, 230°C and 235°C, the host speed is 350rpm.

[0042] The 6 strands of flax yarn 1 are respectively drawn out from the bobbins, subjected to the drying process, and then arranged in parallel and merged into one strand to be introduced into the melt impregnation die head, covered and impregnated with melted modified polypropylene resin, the processing temperature is 230°C, and the pulling speed is The length is 20m / min, and the long flax fiber reinforced pellets are prepared by pultrusion process, and the fiber weight c...

Embodiment 3

[0044] 100 parts by weight of polypropylene, 1.35 parts by weight of antioxidant, 0.9 parts by weight of light stabilizer, 3 parts by weight of toughening agent and 0.1 part by weight of crosslinking agent are fed from the main feed port in proportion, and the aspect ratio is 45: 1. Melt, mix and disperse in a twin-screw extruder, extrude and granulate, and the processing temperature (from the feed port to the die head) is 150°C, 190°C, 200°C, 220°C, 230°C, 230°C, 230°C and 235°C, the host speed is 350rpm.

[0045] The 6 strands of sisal yarn 1 are respectively drawn out from the bobbin, subjected to the drying process, then arranged in parallel and merged into one strand to be introduced into the melt impregnation die, covered and impregnated with melted modified polypropylene resin, the processing temperature is 230°C, and the pulling The speed is 20m / min, and the long sisal fiber reinforced pellets are prepared by pultrusion process, and the fiber weight content is about 30...

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Abstract

The invention discloses a cable coating method-based hemp fiber-reinforced thermoplastic composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 10-30 parts of hemp yarns, 100 parts of thermoplastic resin, 2-5 parts of an antioxidant, 1-3 parts of a light stabilizer, 0-10 parts of a flexibilizer and 0.05-0.3 part of a cross-linking agent. The composite material has the beneficial effects that: compared with the prior art, an original hemp fiber bundle which is formed by lapping of single fibers which are different in length is divided into a few of bundles, so that certain twisting degree is given, the cohesive force among the fibers is improved and the requirements of a pultrusion technology on the tractive force of the yarns are met to improve the production efficiency. Meanwhile, the hemp yarns given with the twisting degree after being divided are combined into one strand to be guided into a melt immersion mold head in parallel, so that the weight ratio of the fibers of enhanced master batches is not affected, and limitation on the resin immersion effect through a twisting process is reduced as much as possible.

Description

technical field [0001] The invention belongs to the field of production and preparation of hemp fiber composite materials, and relates to a hemp long fiber reinforced thermoplastic composite material based on a cable covering method and a preparation method thereof. Background technique [0002] At present, there are two main processes for granulation of fiber-reinforced thermoplastic composites: (1) short fiber reinforcement: directly adding chopped fibers into a banbury mixer or twin-screw extruder for melt extrusion granulation; The shear force makes the fibers evenly and effectively dispersed in the matrix resin, effectively obtaining the effect of material toughening; (2) Long fiber reinforcement: Based on the foreign pultrusion process, the fibers and thermoplastic matrix resin are mixed into continuous fibers, and the fibers are pultruded The process is made into granulation. In order to improve the feasibility of the process and reduce the mixed knitting process of ...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L51/06C08L1/02C08K5/00C08K5/372C08K5/134C08K5/524C08K5/14C08J5/04B29B9/06B29C47/92B29C70/52B29C48/92
CPCC08L23/12B29B9/06B29C48/92B29C70/528B29C2948/9259B29C2948/92704C08J5/045C08J2323/12C08J2401/02C08L2205/03C08L2205/16C08L51/06C08L1/02C08K5/00C08K5/372C08K5/1345C08K5/524C08K5/14
Inventor 周楠婷张扬巩祥壮李宏张鹰张祥福周文
Owner ZHEJIANG PRET NEW MATERIALS