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Preparation method of long raw bamboo fiber composite material

A technology for reinforcing composite materials and bamboo fibrils, which is applied in the chemical post-processing of fibers, plant raw materials, and fiber processing. , good mechanical properties

Inactive Publication Date: 2017-01-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this production process, the bamboo slices are degreened and yellowed, and made into thin bamboo slices. The process is cumbersome and does not make full use of the excellent mechanical properties of the bamboo green fibers.
Chinese patent CN 101607411A discloses a bamboo fiber-reinforced composite material and its manufacturing method, which adopts certain equipment to loosen the inner arc surface and outer arc surface of bamboo slices to remove bamboo green and bamboo yellow, and simultaneously make continuous bamboo fibers Interweaving the oriented fiber mat into a network, and then drying the fiber mat, sizing, forming a blank, and hot pressing. Although this method can prepare a bamboo fiber composite material with high strength, because the produced fiber is relatively thick, the fiber thickness is not good. Even and continuous crosslinking, it is easy to cause uneven distribution of resin in the fiber mat, resulting in uneven strength
Chinese patent CN 101642923A has announced a kind of manufacturing method of bamboo long fiber composite material, and its production process is raw material preparation, dipping, extraction, warm pressing, solidification and post-curing, and wherein bamboo chip has gone through degreening, deyellowing in the raw material preparation After treatment, it is made into bundled bamboo fiber, but the static bending strength of the composite material is only 140-160MPa, and the strength is low.
[0004] To sum up, at present, bamboo fiber composite materials generally have defects such as low strength, which is a problem that the current bamboo fiber composite material industry continues to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Cut the bamboo slices to a certain length, then put them into 40g / L NaOH solution and soak them at room temperature for 28 hours, take them out, rinse them with clean water, and boil them in a cooking container for 1 hour. Cut the boiled bamboo slices from the middle, divide them into two, and take the bamboo slices near the green bamboo to make composite materials. Part of the bamboo slices at the green part of the bamboo are rolled into bundles of bamboo fibers with a roller, and then repeatedly combed into single fibers with sharp and dense comb needles under unidirectional force to extract unidirectional bamboo fibers. Rinse the raw bamboo fiber with hot water to remove the colloid and other debris impurities on the surface of the bamboo fiber, and then put the fiber in an oven to dry. Arrange the unidirectional long bamboo raw fibers evenly along the width direction according to the size of the composite material, and use a sewing machine and polyester thread to se...

Embodiment 2

[0030] Cut the bamboo slices to a certain length, then put them into 50g / L NaOH solution and soak them at room temperature for 26 hours, take them out and rinse them with clean water repeatedly, and then boil them in a cooking vessel for 2 hours. Cut the boiled bamboo slices from the middle, divide them into two, and take the bamboo slices near the green bamboo to make composite materials. Part of the bamboo slices at the green part of the bamboo are rolled into bundles of bamboo fibers with a roller, and then repeatedly combed into single fibers with sharp and dense comb needles under unidirectional force to extract unidirectional bamboo fibers. Rinse the raw bamboo fiber with hot water to remove the colloid and other debris impurities on the surface of the bamboo fiber, and then put the fiber in an oven to dry. Arrange the unidirectional long bamboo raw fibers evenly along the width direction according to the size of the composite material, and use a sewing machine and polye...

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Abstract

The invention provides a preparation method of a long raw bamboo fiber composite material. The method comprises the following process flow: extraction of raw bamboo fiber, preparation of raw bamboo fiber felt, preparation of a resin substrate, gluing, hot pressing, and postcure. The density of the composite material is 1.1-1.3g / cm<3>, tensile strength is 200-285MPa, tensile modulus is 12-16GPa, bending strength is 250-360MPa, flexural modulus is 22-27GPa, and shearing strength is 15-30MPa. The composite material has the advantages of good mechanical properties, good performance of advantages of raw bamboo fibers, widened application fields of the raw bamboo fiber composite material, and wide development space.

Description

technical field [0001] The invention relates to the technical field of fiber-reinforced resin composite materials, in particular to a long bamboo fiber-reinforced unsaturated polyester composite material and a preparation method thereof. Background technique [0002] In recent years, with the development of the economy and the increase of the population, people's demand for daily life products has gradually increased, and the consumption of composite materials and wood has also increased accordingly, which has intensified the shortage of resources and the situation of environmental pollution has become increasingly severe. In order to better protect the environment and meet people's needs, green fiber-reinforced composite materials have become a research hotspot. my country is the country with the richest bamboo resources in the world and is known as the "Kingdom of Bamboo". At present, the natural bamboo forest area in the country is about 5 million hectares, and 500-600 m...

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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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/06C08L97/02D01B1/10D01C1/00B29C70/40
Inventor 王春红张青菊
Owner TIANJIN POLYTECHNIC UNIV