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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 fiber and the difficulty in adding the natural fiber when the natural fiber reinforced composite material is prepared by the extrusion molding method. Difficult dispersion in resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, the preparation of hemp (flax, ramie, jute, sisal, etc.) and polypropylene fiber pellets

[0025] 1) opening hemp (flax, ramie, jute, sisal, etc.) and cotton wool type polypropylene fibers, and mixing them in a ratio of 95 / 5 by mass to obtain mixed cotton;

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

[0027] 3) Heating and twisting the hemp / acrylic composite strip at the same time, controlling the temperature of the hemp / acrylic composite strip within the range of 165-175°C, and the twist within the range of (8±0.5) twist / m, so that the surface of the low-melting point fiber Melting plays the role of bonding, and then cooled and formed to obtain hemp / acrylic composite molding strips; finally, it is cut into hemp / acrylic fiber particles with a length of (7±0.5) mm.

[0028] The particles processed according to the conditions of this method are especially suita...

Embodiment 2

[0029] Embodiment 2, the preparation of cotton fiber and low melting point polyester fiber pellet

[0030] 1) opening cotton fibers and cotton-type low-melting point polyester fibers, and mixing them in a ratio of 5 / 95 by mass to obtain mixed cotton;

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

[0032] 3) Heating and twisting the cotton / low-melting point polyester composite strip at the same time, controlling the temperature of the cotton / low-melting point polyester composite strip within the range of 185-195°C, and the twist within the range of (10±0.5) twist / m, so that The low-melting-point fiber on the surface is melted to play a bonding role, and then cooled and formed to obtain 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 pa...

Embodiment 3

[0034] Embodiment 3, the preparation of bamboo fiber and polyethylene fiber pellet

[0035] 1) opening bamboo fibers and medium-length polyethylene fibers and mixing them in a ratio of 40 / 60 by mass to obtain blended cotton;

[0036] 2) combing the mixed cotton into slivers and drawing to obtain a bamboo fiber / ethylene composite strip with a linear density of (30 ± 1) g / m;

[0037] 3) Heating and twisting the bamboo fiber / ethylene fiber composite strip at the same time, controlling the temperature of the bamboo fiber / ethylene fiber composite strip within the range of 125-135°C, and the twist within the range of (10±0.5) twist / meter, The polyethylene fiber is melted to play a bonding role, and then cooled and formed to obtain a bamboo fiber / ethylene fiber composite strip; finally, it is cut into bamboo fiber / ethylene fiber composite particles with a length of (10±0.5) mm.

[0038] The particles processed according to the conditions of the method can be directly used to prepare...

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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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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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