阅读说明：本技术 一种用于乐器竹纤维材料的纤维板制备方法 (Preparation method of fiberboard for musical instrument bamboo fiber material ) 是由 李刚 于 2018-06-11 设计创作，主要内容包括：本发明提供了一种用于乐器竹纤维材料的纤维板制备方法,包括以下步骤：1)将竹子等天然植物纤维进行氧化、脱糖预处理,制得的连续竹天然纤维；2)将表面改性后的连续竹天然纤维浸渍合成树脂胶黏剂；3)将浸渍合成树脂的竹纤维在模具中进行模压成型,成型固化温度为合成树脂胶黏剂的热固化峰温度,热固化成型后制得植物纤维增强复合材料。本发明提供的一种用于乐器竹纤维材料的纤维板制备方法,生产成本低,力学性能好,声学性能好。(The invention provides a preparation method of a fiberboard for a musical instrument bamboo fiber material, which comprises the following steps: 1) carrying out oxidation and desugarization pretreatment on natural plant fibers such as bamboos to prepare continuous bamboo natural fibers; 2) impregnating the continuous bamboo natural fiber subjected to surface modification with a synthetic resin adhesive; 3) and carrying out compression molding on the bamboo fiber impregnated with the synthetic resin in a mold, wherein the molding curing temperature is the thermosetting peak temperature of the synthetic resin adhesive, and carrying out thermosetting molding to obtain the plant fiber reinforced composite material. The preparation method of the fiberboard for the musical instrument bamboo fiber material provided by the invention has the advantages of low production cost, good mechanical property and good acoustic property.)

1. a preparation method of a fiberboard for musical instrument bamboo fiber materials is characterized by comprising the following steps:

1) Carrying out oxidation and desugarization pretreatment on natural plant fibers such as bamboos to prepare continuous bamboo natural fibers;

2) impregnating the continuous bamboo natural fiber subjected to surface modification with a synthetic resin adhesive;

3) and carrying out compression molding on the bamboo fiber impregnated with the synthetic resin in a mold, wherein the molding curing temperature is the thermosetting peak temperature of the synthetic resin adhesive, and carrying out thermosetting molding to obtain the plant fiber reinforced composite material.

2. The preparation method of the fiberboard for the musical instrument bamboo fiber material as claimed in claim 1, wherein the step 1) comprises the following specific steps:

selecting bamboo species including preferably Phyllostachys pubescens and Sagittaria sagittifolia;

Softening the bamboo, namely placing the bamboo chips in a cooking pool, and injecting a softening liquid into the pool to ensure that the bamboo chips are completely immersed by the softening liquid;

And (2) mechanical splitting, namely treating according to preset parameters, taking out and cleaning the soaked bamboo chips, putting the bamboo chips into a normal-pressure cooking container for cooking for 1 hour, taking out the cooked bamboo chips, splitting the bamboo chips at the thickness part of the bamboo chips from the middle into two parts along the longitudinal direction of the bamboo chips by adopting a bamboo fiber splitting device, wherein the parts close to the bamboo green parts are collectively called bamboo green parts, the parts close to the bamboo yellow parts are collectively called bamboo yellow parts, then respectively rolling the separated bamboo green parts and bamboo yellow parts by using compression rollers, splitting and dispersing the connected fiber bundles by physical and mechanical actions, repeatedly carding the rolled fibers into continuous fibers by using the device under unidirectional acting force, uniformly arranging the unidirectional long bamboo fibers along the same direction, and sewing the bamboo fibers into a uniform unidirectional fiber felt with a certain width by using a sewing machine and polyester threads.

3. the method for preparing the fiberboard for musical instrument bamboo fiber material according to claim 1, wherein the synthetic resin adhesive in the step 2) can be a matrix resin such as phenolic resin, epoxy resin, vinyl resin and unsaturated resin, preferably phenolic resin and epoxy resin adhesive;

the preparation method of the phenolic resin adhesive comprises the following components in parts by weight: 70-80 parts of phenolic resin, 2-3 parts of anti-aging agent, 3-4 parts of dispersing agent, 3-5 parts of compatilizer, 0.5-1.5 parts of plasticizer, 4-6 parts of flame retardant, 0.5-1 part of accelerator and 9-12 parts of filler;

the phenolic resin comprises thermosetting phenolic resin prepared by using an alkaline catalyst, the content of free aldehyde is not more than 5 percent of the solid of the resin, the phenolic resin is preferably prepared by phenol and formaldehyde (37 percent or 50 percent solution), and 15 percent of the amount of phenol can be replaced by cresol, xylenol and polyphenyl phenol;

The filler comprises clay with the grain diameter of 1000-4000 meshes, talcum powder, white oxide powder, calcite and silicon carbide, and the talcum powder and the silicon carbide with the grain diameter of 2000-3000 meshes are preferred.

4. The method for preparing the fiberboard for the musical instrument bamboo fiber material according to claim 3, wherein the anti-aging agent is anti-aging agent 264 or anti-aging agent 4010, the dispersant is sodium hexametaphosphate, the compatilizer is MBS, the plasticizer is acetic acid bis stearamide, and the flame retardant is octabromodiphenylethane.

5. the method for preparing a fiberboard for musical instrument bamboo fiber materials as claimed in claim 3, wherein the steps of the synthetic resin adhesive are as follows: adding half of phenolic resin, an anti-aging agent, a plasticizer and a flame retardant into a stirring kettle, uniformly stirring to obtain a component A, adding the other half of phenolic resin, a curing agent, a compatilizer, an accelerator and SEBS into the stirring kettle according to the formula, heating to 80 ℃, stirring for 30 minutes to obtain a component B, adding the component B and a dispersing agent into the component A, and uniformly stirring to obtain the phenolic resin adhesive.

6. The preparation method of the fiberboard for the musical instrument bamboo fiber material as claimed in claim 1, wherein the specific implementation steps of the step 3) are as follows:

Uniformly coating a certain proportion of phenolic resin adhesive on each prepared layer of unidirectional bamboo fiber felt by a hand pasting process, and parallelly arranging each layer of bamboo fiber felt coated with the phenolic resin adhesive according to a certain angle to prepare unidirectional fiber board blanks; then placing the unidirectional fiber board blank into a hydraulic press mold, cold-pressing at room temperature for 5min under a certain pressure condition to enable the resin to uniformly permeate into the fiber felt, and then taking out the mold; then moving the die into a hydraulic press with a certain temperature, and carrying out 5M pressure for 30min; then, the temperature is raised to 80 ℃,5M pressure is applied for 90min, and after the hot pressing is finished, the pressure is maintained for 60-180min, and then the composite material can be taken out; and finally, placing the prepared composite material for 24 hours, and then placing the composite material into a 95 ℃ oven to be dried for 2 hours to finish post-curing.

Technical Field

the invention relates to the technical field of musical instrument materials, in particular to a preparation method of a fiberboard for a musical instrument bamboo fiber material.

Background

Along with the improvement of living standard, the requirement of people on living quality is relatively increased, music is an art reflecting the emotion of real life of human beings, and the music can be used for mastering temperament and performance and is pleasing to the eyes, and the enjoyment of hearing is not brought to people. Particularly, the national advocates and promotes the quality education, the music quality education is generally developed, and the demand for musical instruments is more and more, and the musical instruments refer to instruments which can play tone colors by various methods, can generate musical tones and can recreate music art. Musical instruments include national musical instruments and western musical instruments, which are produced differently from general industrial products, and require not only a product to be modeled with a reasonable and elegant appearance but also good acoustic qualities including timbre, music and a prescribed intonation height, thereby having very strict requirements on materials. Most of the existing good musical instruments (plucking, bowstring, etc.) must be made of special wood by special processes, resulting in very high cost and high price. Even so, with the scarcity of precious wood, many of the woods traditionally used in musical instrument manufacturing have been banned from felling or shipping. Such as brazilian rose, honduras mahogany, and the like. At present, instruments such as guitars and violins made of artificial materials are also emerging, and carbon fiber materials are often used.

the natural fiber composite material is a green environment-friendly composite material which is formed by processing and molding pretreated natural fibers and a resin matrix through related processes and has a novel composite structure and excellent comprehensive performance. Because of the reproducibility and the absorbability to the environment of the plant fiber, the natural fiber composite material is a green and environment-friendly material with great development prospect and has wide market prospect and good economic and social benefits. Bamboo is the second forest resource in the world except wood, and bamboo has the characteristics of high strength, good toughness, high hardness and the like compared with wood due to quick growth, quick update, wide distribution and high yield, so that the bamboo is an ideal raw material for structural materials and fiber materials and is applied to the building industry, the handicraft industry, the agriculture and the fishery. With the global emphasis on recyclable materials, bamboo is widely used as a green material that grows fast and does not occupy arable land. Research on natural bamboo fibers has been carried out in japan for many years, and in 1988, ToyoPress co ltd, japan, developed a system for effectively splitting bamboo into fibers, and the produced bamboo fibers can be used for fiber-reinforced composites instead of glass fibers. The heat tide of the domestic development of natural bamboo fiber is continuous, and the preparation of the bamboo fiber is also broken through. A bamboo bundle fiber is made by removing cyan from 12-18 months old Sagittaria sagittifolia in a Langzhou cotton textile mill, repeatedly rolling with gears, incompletely degumming, spinning on cotton spinning equipment, and trial spinning in 2000 to obtain yarn. In 2005, Yao wen bin, Zhang mu et al, university of agriculture and forestry in Zhejiang, proposed a preparation technology of bamboo fiber splitting by cracking on the basis of preliminarily disclosing a bamboo thermal-mechanical coupling splitting mechanism.

at present, bamboo fibers have the condition of industrial production, natural bamboo fiber composite materials are paid attention to by people due to the specific advantages of the natural bamboo fiber composite materials, the application of the natural bamboo fibers in fiber reinforced composite materials is gradually expanded, but the potential advantages of the natural bamboo fibers are not fully exerted. Compared with synthetic fibers, the natural bamboo fibers have the advantages of high strength, good rigidity and other excellent performances, and also have the performances of antibiosis, deodorization, sound insulation, moisture absorption and the like, and have the characteristics of nature, greenness, environmental protection, degradability and the like, so that the natural bamboo fibers are inevitably the preferred materials in the industries of automobiles, buildings and the like.

In natural fiber composites, the fibers are dispersed as reinforcement in a resin matrix and serve the primary load-bearing function. The used plant fiber mainly comprises cellulose, hemicellulose and lignin, contains a large amount of hydrophilic groups, namely hydroxyl groups, and has strong polarity, the composite matrix resin is usually nonpolar and non-hydrophilic polyolefin resin, and the conventional wood-plastic composite material is mainly formed by compounding the plant fiber and the resin matrix; because hydrogen bonds can be formed among hydroxyl groups, and the plant fibers have strong interaction, the dispersion of the plant fibers in a resin matrix is extremely poor, and uniform dispersion is difficult to achieve; when the temperature of the forming processing is higher, the plant filler is easy to degrade and discolor, and meanwhile, the polymer matrix material is also thermally degraded. Therefore, the existing wood-plastic composite material is difficult to meet the requirements of musical instrument materials. With the shortage of rare wood, the chopping or transportation of wood which is traditionally applied to the manufacture of musical instruments is forbidden, and how to develop a synthetic material which imitates the performance and the shape of wood and meets the acoustic performance requirements of musical instruments becomes an urgent need for the development of modern musical instrument materials. The invention combines the characteristics of synthetic resin and natural fiber, invents a composite material of natural fiber reinforced synthetic resin matrix and a preparation technology thereof, the invented natural fiber reinforced composite material not only has the appearance and mechanical property of wood, but also can meet the acoustic property of musical instruments, and the natural fiber reinforced composite material is required to replace the traditional solid wood and is applied to the preparation of traditional musical instruments such as violins, koto and the like.

disclosure of Invention

The invention aims to solve the problems in the background technology, and provides a preparation method of a fiberboard for a musical instrument bamboo fiber material, which is low in production cost, good in mechanical property and good in acoustic property.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

A preparation method of a fiberboard for musical instrument bamboo fiber materials comprises the following steps:

1) carrying out oxidation and desugarization pretreatment on natural plant fibers such as bamboos to prepare continuous bamboo natural fibers;

2) Impregnating the continuous bamboo natural fiber subjected to surface modification with a synthetic resin adhesive;

3) And carrying out compression molding on the bamboo fiber impregnated with the synthetic resin in a mold, wherein the molding curing temperature is the thermosetting peak temperature of the synthetic resin adhesive, and carrying out thermosetting molding to obtain the plant fiber reinforced composite material.

as an improvement, the step 1) comprises the following specific steps:

selecting bamboo species including preferably Phyllostachys pubescens and Sagittaria sagittifolia;

Softening the bamboo, namely placing the bamboo chips in a cooking pool, and injecting a softening liquid into the pool to ensure that the bamboo chips are completely immersed by the softening liquid;

And (2) mechanical splitting, namely treating according to preset parameters, taking out and cleaning the soaked bamboo chips, putting the bamboo chips into a normal-pressure cooking container for cooking for 1 hour, taking out the cooked bamboo chips, splitting the bamboo chips at the thickness part of the bamboo chips from the middle into two parts along the longitudinal direction of the bamboo chips by adopting a bamboo fiber splitting device, wherein the parts close to the bamboo green parts are collectively called bamboo green parts, the parts close to the bamboo yellow parts are collectively called bamboo yellow parts, then respectively rolling the separated bamboo green parts and bamboo yellow parts by using compression rollers, splitting and dispersing the connected fiber bundles by physical and mechanical actions, repeatedly carding the rolled fibers into continuous fibers by using the device under unidirectional acting force, uniformly arranging the unidirectional long bamboo fibers along the same direction, and sewing the bamboo fibers into a uniform unidirectional fiber felt with a certain width by using a sewing machine and polyester threads.

As an improvement, the synthetic resin adhesive in step 2) may be a matrix resin such as phenolic resin, epoxy resin, vinyl resin, unsaturated resin, and the like, preferably phenolic resin and epoxy resin adhesive;

The preparation method of the phenolic resin adhesive comprises the following components in parts by weight: 70-80 parts of phenolic resin, 2-3 parts of anti-aging agent, 3-4 parts of dispersing agent, 3-5 parts of compatilizer, 0.5-1.5 parts of plasticizer, 4-6 parts of flame retardant, 0.5-1 part of accelerator and 9-12 parts of filler;

The phenolic resin comprises thermosetting phenolic resin prepared by using an alkaline catalyst, the content of free aldehyde is not more than 5 percent of the solid of the resin, the phenolic resin is preferably prepared by phenol and formaldehyde (37 percent or 50 percent solution), and 15 percent of the amount of phenol can be replaced by cresol, xylenol and polyphenyl phenol;

The filler comprises clay with the grain diameter of 1000-4000 meshes, talcum powder, white oxide powder, calcite and silicon carbide, and the talcum powder and the silicon carbide with the grain diameter of 2000-3000 meshes are preferred.

as an improvement, the anti-aging agent is anti-aging agent 264 or anti-aging agent 4010, the dispersing agent is sodium hexametaphosphate, the compatilizer is MBS, the plasticizer is acetic acid bis stearamide, and the flame retardant is octabromodiphenylethane.

As an improvement, the synthetic resin adhesive comprises the following steps: adding half of phenolic resin, an anti-aging agent, a plasticizer and a flame retardant into a stirring kettle, uniformly stirring to obtain a component A, adding the other half of phenolic resin, a curing agent, a compatilizer, an accelerator and SEBS into the stirring kettle according to the formula, heating to 80 ℃, stirring for 30 minutes to obtain a component B, adding the component B and a dispersing agent into the component A, and uniformly stirring to obtain the phenolic resin adhesive.

as an improvement, the specific implementation steps of the step 3) are as follows:

Uniformly coating a certain proportion of phenolic resin adhesive on each prepared layer of unidirectional bamboo fiber felt by a hand pasting process, and parallelly arranging each layer of bamboo fiber felt coated with the phenolic resin adhesive according to a certain angle to prepare unidirectional fiber board blanks; then placing the unidirectional fiber board blank into a hydraulic press mold, cold-pressing at room temperature for 5min under a certain pressure condition to enable the resin to uniformly permeate into the fiber felt, and then taking out the mold; then moving the die into a hydraulic press with a certain temperature, and carrying out 5M pressure for 30min; then, the temperature is raised to 80 ℃,5M pressure is applied for 90min, and after the hot pressing is finished, the pressure is maintained for 60-180min, and then the composite material can be taken out; and finally, placing the prepared composite material for 24 hours, and then placing the composite material into a 95 ℃ oven to be dried for 2 hours to finish post-curing.

the invention has the beneficial effects that:

The invention not only keeps the appearance and the mechanical property of wood, but also can meet the acoustic property of musical instruments, replaces the traditional solid wood, is applied to preparing traditional musical instruments such as violins, koto and the like, and the prepared phenolic resin adhesive has the advantages of good heat resistance, high bonding strength, good aging resistance, excellent electrical insulation, low price, easy use, large polarity, strong bonding force, large rigidity, water resistance, oil resistance, chemical medium resistance and mould resistance; the production cost is low.

Detailed Description

The invention is illustrated below by means of specific examples, without being restricted thereto.