Natural fiber granulating process for preparing composite materials

A technology of natural fibers and synthetic fibers, applied in the direction of coating, etc., can solve the problems of difficult fiber dispersion and natural fiber feeding, and achieve the effects of accurate measurement of addition, avoiding equipment damage, and uniform distribution

Active Publication Date: 2010-04-14
THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the natural fiber is granulated by the method of the present invention, it is added into the extruder in the form of pellets, which solves the difficulty in feeding the natural

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1. Preparation of hemp (flax, ramie, jute, sisal, etc.) and polypropylene fiber pellets

[0025] 1) Open hemp (flax, ramie, jute, sisal, etc.) and cotton-wool polypropylene fibers, and mix them at a mass ratio of 95 / 5 to obtain mixed cotton;

[0026] 2) Combing the mixed cotton into slivers and draws to obtain a hemp / C composite sliver with a linear density of (10±1) g / m;

[0027] 3) Heat and twist the hemp / acrylic composite strip at the same time, control the temperature of the hemp / acrylic composite strip in the range of 165-175℃, and the twist in the range of (8±0.5) twists / meter, so that the surface of the fiber has a low melting point. Melting plays the role of bonding, and then cools and forms a hemp / propylene composite molding strip; finally, it is cut into hemp / propylene fiber particles with a length of (7±0.5) mm.

[0028] The particles processed according to the conditions of the method are particularly suitable for the preparation of natural fiber composite m...

Example Embodiment

[0029] Example 2: Preparation of cotton fiber and low-melting polyester fiber pellets

[0030] 1) The cotton fiber and cotton-type low-melting polyester fiber are opened and mixed in a mass ratio of 5 / 95 to obtain mixed cotton;

[0031] 2) Combing the mixed cotton into slivers and draws to obtain a cotton / low melting point polyester composite sliver with a linear density of (15±1) g / m;

[0032] 3) Heat and twist the cotton / low melting point polyester composite strip at the same time, and control the temperature of the cotton / low melting point polyester composite strip within the range of 185-195℃, and the twist within the range of (10±0.5) twists / meter, so that The low-melting-point fibers on the surface are melted to play a bonding role, and then cooled to form a cotton / low-melting-point polyester composite strip; finally, it is cut into cotton / low-melting-point polyester composite particles with a length of (10±0.5) mm.

[0033] The particles processed under the conditions of the me...

Example Embodiment

[0034] Example 3 Preparation of bamboo fiber and ethylene fiber pellets

[0035] 1) The bamboo fiber and the medium-length ethylene fiber are opened and mixed according to the mass ratio of 40 / 60 to obtain mixed cotton;

[0036] 2) Combing the mixed cotton into strips and draws to obtain a bamboo fiber / polyethylene composite strip with a linear density of (30±1) g / m;

[0037] 3) Heat and twist the bamboo fiber / polyethylene fiber composite strip at the same time, control the temperature of the bamboo fiber / polyethylene fiber composite strip in the range of 125-135℃, and the twist in the range of (10±0.5) twists / meter. The ethylene fiber is melted for bonding, and then cooled to form a bamboo fiber / polyethylene fiber composite strip; finally, it is cut into bamboo fiber / polyethylene fiber composite particles with a length of (10±0.5) mm.

[0038] The particles processed under the conditions of the method can be directly used in the extrusion method to prepare composite materials without...

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PUM

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Abstract

The invention discloses a natural fiber granulating process for preparing composite materials. The natural fiber granulating process comprises steps as follows: (1) opening natural fibers and low-melting fibers and mixing the natural fibers with the low-melting fibers in mass ratio of 95/5-5/95 so as to obtain blend fibers, wherein the melting point of the low-melting fiber is lower than 200 DEG C; (2), carding and drawing the blend fibers obtained from the step (1) to form natural fiber tops; (3) simultaneously heating and twisting the natural fiber tops obtained from the step (2), obtaining natural fiber formed tops by cooling and forming, and finally obtaining natural fiber granules via cutting. After the natural fibers are granulated by aid of the process, granulated natural fibers are fed into an extrusion machine, and then problems of difficulty of feeding of the natural fibers and difficulty of dispersing fibers in resin when preparing natural fiber reinforced composite materials by adopting the extrusion molding are resolved.

Description

technical field [0001] The present invention relates to a process for pelletizing natural fibers for the preparation of composite materials. Background technique [0002] Glass fiber reinforced composite materials have been widely used in the production of industrial and daily products, but the use of glass fiber for resin reinforcement also exposes many shortcomings. First of all, glass fiber is brittle and easy to break during processing, and the fiber length-to-diameter ratio cannot be very large, so the reinforcement effect is limited; secondly, glass fiber will cause greater wear and tear on the equipment during processing, making the update cycle of equipment components short; in addition , glass fiber will also bring health threats to operators; finally, glass fiber is not degradable, and its products will pollute the environment relatively large after being discarded. [0003] Recently, natural fiber-reinforced composites have become a new field of composites resear...

Claims

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Application Information

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IPC IPC(8): B29B9/00B29B9/16
Inventor 严自力张华张建春郝新敏马天李军
Owner THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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