WO2019114484A1

WO2019114484A1 - Carbon-fiber-reinforced composite material for making musical instrument, and preparation method therefor

Info

Publication number: WO2019114484A1
Application number: PCT/CN2018/115399
Authority: WO
Inventors: 李名敏; 关安南; 谭松; 陆子天; 黄明瑜; 夏超; 郑明嘉; 宁方林; 叶南飚; 钟锐; 刘可颖; 周汀沙; 周联峰
Original assignee: 金发科技股份有限公司; 广州市拿火信息科技有限公司
Priority date: 2017-12-12
Filing date: 2018-11-14
Publication date: 2019-06-20
Also published as: CN107955322B; CN107955322A

Abstract

Disclosed are a carbon-fiber-reinforced composite material for making a musical instrument, and a preparation method therefor, which relate to the field of materials. The carbon-fiber-reinforced composite material comprises, in parts by weight: 20-80 parts of an acrylonitrile-butadiene-styrene copolymer, 15-35 parts of carbon fibers, and 5-30 parts of an acrylonitrile-styrene copolymer. The preparation method comprises: mixing, in parts by weight, the acrylonitrile-butadiene-styrene copolymer and the acrylonitrile-styrene copolymer with an auxiliary agent to obtain a mixed material; and mixing the mixed material with the carbon fibers, and then extruding and pelletizing same. The carbon-fiber-reinforced composite material prepared by the method has higher specific strength, flexural modulus, and impact strength, enabling the musical instrument made therefrom to have good tone quality and quality, and also improving the production efficiency of the musical instrument.

Description

[Name of invention by ISA according to Rule 37.2] Carbon fiber reinforced composite material for manufacturing musical instrument and preparation method thereof

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 201711315233.0, entitled "Carbon Fiber Reinforced Composite Material for Manufacture of Musical Instruments and Preparation Method thereof", filed on December 12, 2017, the entire contents of which is incorporated herein by reference. This is incorporated herein by reference.

Technical field

The present application relates to the field of materials, and in particular to a carbon fiber reinforced composite material for manufacturing musical instruments and a preparation method thereof.

Background technique

Currently, the manufacturing process of musical instruments is mostly made of wood, such as guitar. The preparation process of the guitar is usually done by hand processing the specific wood to obtain the major parts, and then by hand bonding by glue, the efficiency is relatively low, the consistency is poor, and the wood materials used in the major parts have special requirements, and the source of the wood is limited. The price is high. For example, the most commonly used material for making panels is spruce. The quality of the panels produced is different. The back and side panels need to be hard and strong. Therefore, the commonly used woods are Brazilian rosewood, African rosewood, etc.; And maple is the most common neck wood; most wood guitar fingerboard materials use ebony or rosewood. In addition, because the wood is affected by the weather, too much moisture and too dry will make the acoustic guitar deformed, even a slight deformation will affect the sound quality of the guitar.

In addition, there are some plastic instruments on the market, still taking guitar as an example. These plastic guitars are basically electric guitars, which need to be played under the premise of power-on, otherwise the guitar will not make a sound. Due to the influence of the preparation materials of the musical instrument on its sound quality and volume, the existing thermoplastic materials are difficult to meet the needs of manufacturing musical instruments in terms of mechanical strength and flexibility. As a result, there are currently no thermoplastic materials on the market that can be directly used to make musical instruments and have excellent performance and sound.

Summary of the invention

A first object of the present application is to provide a carbon fiber reinforced composite material for manufacturing a musical instrument, which has high specific strength, flexural modulus and impact strength, and enables a musical instrument prepared therefrom to have good sound quality. And quality, while also improving the productivity of the instrument.

A second object of the present application is to provide a method for preparing the above carbon fiber reinforced composite material, which has a simple preparation process and is easy to industrially and continuously produce.

In order to achieve the above object of the present application, the following technical solutions are adopted:

A carbon fiber reinforced composite material for manufacturing musical instruments, which comprises, by weight:

20 to 80 parts of acrylonitrile-butadiene-styrene copolymer,

15 to 35 parts of carbon fiber and

The acrylonitrile-styrene copolymer is 5 to 30 parts.

A method for preparing the above carbon fiber reinforced composite material, comprising:

Mixing an acrylonitrile-butadiene-styrene copolymer, an acrylonitrile-styrene copolymer and an auxiliary agent in parts by weight to obtain a mixed material;

The mixed material is mixed with the carbon fibers and extruded and granulated.

Compared with the prior art, the beneficial effects of the present application include, for example:

The carbon fiber reinforced composite material provided by the present application has high specific strength, flexural modulus, impact strength and heat distortion temperature, thereby ensuring the sound quality and quality of the musical instrument prepared therefrom, for example, for preparing a guitar, a piano backboard, and a cymbal. And other instruments. This material can be used to integrally form the major parts of the instrument by an injection molding process, thereby replacing the traditional limitations of wood-made musical instrument parts, greatly improving the manufacturing efficiency of the instrument.

Detailed ways

The embodiments of the present application are described in detail below with reference to the embodiments, but those skilled in the art will understand that the following examples are only used to illustrate the present application and should not be construed as limiting the scope of the application. Those who do not specify the specific conditions in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are conventional products that can be obtained by commercially available purchase.

The present embodiment provides a carbon fiber reinforced composite material for manufacturing a musical instrument, which has high specific strength, flexural modulus, impact resistance and deformation temperature, and can ensure that a musical instrument prepared therefrom has good sound quality and has Excellent drop resistance and dimensional stability.

Although there are many kinds of thermoplastic materials in the prior art, the non-reinforced thermoplastic material has a low flexural modulus, and the guitar neck manufactured by the guitar neck cannot withstand the pulling force of the metal strings; and the guitar panel manufactured by the same The rigidity is poor, the resonance is not strong, the volume is small, and the sound quality is poor.

When the glass fiber reinforced thermoplastic material requires a high content of glass fiber, the flexural modulus of the material can be increased, but at the same time, the density of the injection molded part is large, the specific strength is small, and the injection molded part is added due to the addition of a large amount of glass fiber. The surface is rough and cannot be sprayed further.

In contrast, carbon fiber, which has a low density, and an equivalent amount of carbon fiber reinforced thermoplastic material, has a significantly better flexural modulus than a glass fiber reinforced thermoplastic material, so it is suitable to select a carbon fiber reinforced thermoplastic material. However, there are many types of carbon fiber reinforced thermoplastic materials, and the resins are crystalline and amorphous.

Usually, the instrument requires high dimensional stability of the material. If the dimensional stability of the material is not good, it will affect the quality of the instrument, for example, it will affect the tension of the metal string of the guitar, thus affecting the sound quality of the guitar. The carbon fiber-reinforced crystalline resin material is inferior in dimensional stability, and therefore a carbon fiber-reinforced amorphous resin material is preferable.

A variety of amorphous materials, such as polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), acrylonitrile-styrene copolymer (AS), polystyrene (PS) or polypropylene (PPE) and so on. General-purpose plastics are easier to injection-molded than engineering plastics, and the molding temperature is also low. Since the integrally formed musical instrument parts are large, general-purpose plastics with good fluidity are preferred. Commonly used carbon fiber reinforced ABS materials have problems such as insufficient flexural modulus, warpage, surface floating fibers, and no spraying, which do not meet the requirements for the preparation of musical instruments.

Based on the above analysis, the carbon fiber reinforced composite material for manufacturing musical instruments provided by the present application includes, by weight:

Acrylonitrile-butadiene-styrene copolymer (ABS resin) 20 to 80 parts,

15 to 35 parts of carbon fiber,

Acrylonitrile-styrene copolymer (AS resin) 5 to 30 parts.

Further, the carbon fiber reinforced composite material comprises: 30 to 70 parts of ABS resin, 20 to 30 parts of carbon fiber, and 10 to 25 parts of AS resin, by weight;

Or, by weight, the carbon fiber reinforced composite material comprises: 40 to 60 parts of ABS resin, 23 to 28 parts of carbon fiber, and 15 to 20 parts of AS resin;

Alternatively, the carbon fiber reinforced composite material comprises, by weight, 45 to 55 parts of ABS resin, 24 to 26 parts of carbon fiber, and 17 to 18 parts of AS resin.

Further, the carbon fibers are chopped carbon fibers, and the chopped carbon fibers have a diameter of 5 to 10 μm, or 6 to 9 μm, or 7 to 8 μm. The fraction and diameter of the chopped carbon fiber affect the flexural modulus and density of the material, which affects the specific strength of the material.

Further, the number average molecular weight of the acrylonitrile-styrene copolymer is from 18,000 to 22,000.

Further, it further comprises 0.2 to 0.6 parts by weight of the antioxidant and 0.4 to 0.8 parts of the lubricant; or 0.3 to 0.5 parts of the antioxidant and 0.5 to 0.7 parts of the lubricant; or, the antioxidant is 0.4 parts and 0.6 parts of lubricant.

Among them, the antioxidant includes n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and tris[2.4-di-tert-butylphenyl]phosphite. More preferably, the antioxidant comprises, by weight: β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid n-octadecyl alcohol ester 0.1-0.3 part and three [2.4-two Tert-butylphenyl]phosphite 0.1-0.3 parts.

Among them, the lubricant includes zinc stearate and ethylene bis stearamide. More preferably, the lubricant comprises, by weight, 0.2 to 0.4 parts of zinc stearate and 0.2 to 0.4 parts of ethylene bisstearamide.

The embodiment further provides a method for preparing the above carbon fiber reinforced composite material, which comprises:

Step S1: The acrylonitrile-butadiene-styrene copolymer, the acrylonitrile-styrene copolymer and the auxiliary agent are mixed in parts by weight to obtain a mixed material.

Among them, the additives are antioxidants and lubricants.

More specifically, the premix is mixed, that is, the acrylonitrile-butadiene-styrene copolymer, the acrylonitrile-styrene copolymer and the auxiliary agent are added into the premixer in parts by weight, and mixed for 3 to 5 minutes to obtain A homogeneous mixture.

Step S2: After mixing the mixture with carbon fibers, extrusion granulation is carried out.

Further, the step comprises: kneading and melting the mixture at 200 to 230 ° C, mixing with carbon fibers, kneading and melting at 180 to 220 ° C, extruding and granulating, and cooling at 25 to 45 ° C. .

Further, the carbon fiber reinforced composite material is prepared by an extruder. In order to increase the dispersibility of the components, the screw length to diameter ratio of the extruder is 46 to 50:1, or 47 to 49:1.

Further, the temperature setting of the extruder includes: T1 zone (80-120 ° C), T2 zone (180-220 ° C), T3 zone (180-220 ° C), T4 zone (180-230 ° C), T5 zone ( 190～230°C), T6 area (180～220°C), T7 area (170～210°C), T8 area (170～210°C), T9 area (170～210°C), T10 area (170～210°C) , T11 area (180 ~ 220 ° C), T12 area (180 ~ 220 ° C); the temperature of the nose area is 190 ~ 230 ° C.

The carbon fiber reinforced composite material prepared by this method has high specific strength, flexural modulus, and heat distortion temperature, thereby ensuring the sound quality of the instrument prepared therefrom, and can be used for preparing a guitar, a piano backboard, or a cymbal. This material can be used to integrally form the major parts of the instrument through the injection molding process, thereby replacing the traditional restrictions on the preparation of musical instrument parts from wood, greatly improving the manufacturing efficiency of the instrument.

For example, using the carbon fiber reinforced composite to prepare a guitar:

The guitar is composed of a panel, a neck, a back side panel, a sound beam, a side strip, an adjustment rod, and the like. Through the carbon fiber reinforced composite material provided by the present application, the injection molding and the auxiliary gas assisted molding process are used to integrally form the side plate, the back plate, the head and the neck parts, thereby avoiding bonding with glue. The process, and because of the high flexural modulus of the composite (19000 MPa), the adjustment of the support rod is not required to ensure that the guitar does not deform under the tension of the strings, and the traditional wooden guitar neck must be provided with a metal support rod. Prevent deformation.

The traditional acoustic guitar panel and the sound beam are separated and then glued together. Through the carbon fiber reinforced composite material of the present application, the process of injection molding and auxiliary gas assisted molding can be used to integrally prepare the panel and the sound beam.

Therefore, the guitar is prepared by using the carbon fiber reinforced composite material, and only one injection molding process is required to obtain the integral guitar panel sound beam portion and the guitar body portion (including the guitar back plate, the side plate and the neck), and then the glue is used. Bond the two parts to get the guitar.

Therefore, the use of this carbon fiber reinforced composite material to prepare the guitar can not only break through the limitations of the traditional wooden guitar material, but also reduce the guitar preparation process, reduce the complicated manual work, greatly improve the guitar production efficiency, and also ensure The consistency of guitar quality. At the same time, compared to the existing electric guitar, this guitar made of carbon fiber reinforced composite has a unique sound quality, and its volume and acoustic performance are higher than that of a wooden guitar, and it can be played without power. In addition, the guitar molded by this carbon fiber reinforced composite material has a smooth appearance and can be sprayed; and since the heat distortion temperature of the carbon fiber reinforced composite material is as high as 100 ° C, the humidity of 15-85% does not affect its performance, so Make sure that guitars made from this carbon fiber reinforced composite have a wide range of operating temperatures and humidity.

The features and performance of the present application are further described in detail below with reference to the embodiments:

Preparation method of carbon fiber reinforced composite material:

a. acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene copolymer and auxiliary agent are mixed in parts by weight to obtain a mixed material; wherein the auxiliary agent includes: β-(3,5-di-tert-butyl) 0.2 parts of n-octadecyl alcohol of 4-hydroxyphenyl)propionate, 0.2 parts of tris[2.4-di-tert-butylphenyl]phosphite, 0.3 parts of zinc stearate and ethylene bisstearamide 0.3 Share.

b. The mixture is kneaded and melted at 200 to 230 ° C, mixed with chopped carbon fibers, kneaded and melted at 180 to 220 ° C, extruded and granulated, and cooled at 25 to 45 ° C, that is, Got it.

The performance of the carbon fiber reinforced composite material provided by the present application was evaluated in conjunction with performance test data.

(1) According to the above method for preparing a carbon fiber reinforced composite material, carbon fiber reinforced composite materials are prepared according to the group distribution ratios shown in Table 1, and performance tests are performed according to ISO standards to investigate the effect of the number of carbon fibers on the properties of the composite material. The results are as described in Table 1:

Table 1. Effect of the fraction of carbon fiber on the properties of composites

It can be seen from Table 1 that the carbon fiber fraction mainly affects the flexural modulus and density of the material, thereby affecting the specific strength of the material. The specific strength of the material affects the resonance of the guitar panel and the body, which affects the volume and sound quality of the guitar. The higher the intensity, the greater the volume. At the same time, the flexural modulus affects the tensile strength of the guitar neck. The higher the flexural modulus, the greater the tensile force against the strings, and the less likely the neck is to deform.

The comparison shows that the specific strength of the material in Comparative Example 1 is too low, the resonance effect is very weak, the bass cannot be produced, and the high pitch is not complete. In addition, the flexural modulus of the material in Comparative Example 1 was too low to resist the tensile force of the strings.

(2) According to the preparation method of the above carbon fiber reinforced composite material, the carbon fiber reinforced composite material is prepared according to the group distribution ratio described in Table 2, and the performance test is carried out according to the ISO standard, and the influence of the fraction of ABS on the properties of the composite material is investigated. The results are as described in Table 2:

Table 2. Effect of the number of ABS on the properties of composites

It can be seen from Table 2 that the number of parts of ABS mainly affects the notched impact properties of the material, thereby affecting the impact toughness of the material. The higher the ABS content, the higher the notched impact strength of the material, indicating that the impact resistance of the material is enhanced, but the addition of ABS will reduce the specific strength of the material, so the suitable ABS fraction ranges from 25 to 80 parts.

(3) According to the preparation method of the above carbon fiber reinforced composite material, the carbon fiber reinforced composite material is prepared according to the group distribution ratio described in Table 3, and the performance test is performed according to the ISO standard, and the influence of the number of parts of AS on the performance of the composite material is investigated. The results are as described in Table 3:

Table 3. Effect of the number of parts of AS on the properties of composites

It can be seen from Table 3 that the number of parts of AS mainly affects the fluidity and glossiness of the material during melt injection molding, and the fluidity is good. When the guitar shape is injected, the parts can easily fill the mold cavity, but the AS is added. After more, the impact strength of the material will be reduced. After the material of Comparative Example 2 was melted, the fluidity was poor, and when the guitar type was injection molded, it could not be filled; and the gloss of the injection molded part was poor, and it was impossible to spray paint, and eventually the guitar could not be manufactured. The material of Comparative Example 3, because the notch strength is too low, so that it cannot be tested, the guitar is made, and the guitar is broken when it hits, and the guitar cannot be manufactured. Therefore, the suitable range for AS is 5 to 30 parts.

(4) According to the preparation method of the above carbon fiber reinforced composite material, the carbon fiber reinforced composite material was prepared according to the group distribution ratio described in Table 4, and the performance test was carried out according to the ISO standard, and the influence of the molecular weight of the AS on the properties of the composite material was investigated. As described in Table 4:

Table 4. Effect of molecular weight of AS on properties of composites

It can be seen from the comparison of AS of different molecular weights in Table 4 that the molecular weight of AS affects the fluidity and glossiness of the material during melt injection molding, and the fluidity is good. When the guitar type is molded, the parts can be easily filled with the mold cavity. However, the molecular weight of AS is too high to improve the fluidity and gloss of the material. Too low will make the material very brittle, so the suitable molecular weight range is 18,000-22000.

(5) Using the carbon fiber reinforced composite material prepared in Example 1, using an injection molding process and an auxiliary gas assisted molding process, respectively, an integral molded guitar panel sound beam portion and a guitar body portion (including a guitar back) are obtained through two injection molding processes. Plate, side plate and neck), then glue the two parts to get a 38-inch guitar, compared with the commercially available 38-inch wooden guitar, the results are shown in Table 5:

Table 5. Guitar performance comparison

Since the volume of the guitar is proportional to the flexural modulus and specific strength of the material, the higher the flexural modulus, the greater the specific strength and the greater the volume of the guitar. As can be seen from Table 5, the guitar prepared by the carbon fiber reinforced composite material provided in the present Example 1 has a sound sustaining sound superior to a commercially available acoustic guitar at the same size, and has a wider use temperature and humidity.

While the present invention has been illustrated and described with reference to the embodiments of the present invention, it will be understood that many other modifications and changes can be made without departing from the spirit and scope of the application. Accordingly, it is intended to embrace in the appended claims

Claims

A carbon fiber reinforced composite material for manufacturing an musical instrument, characterized in that the carbon fiber reinforced composite material comprises, by weight:

20 to 80 parts of acrylonitrile-butadiene-styrene copolymer,

15 to 35 parts of carbon fiber and

The acrylonitrile-styrene copolymer is 5 to 30 parts.
The carbon fiber reinforced composite material according to claim 1, wherein the carbon fibers are chopped carbon fibers.
The carbon fiber reinforced composite material according to claim 2, wherein the chopped carbon fiber has a diameter of 5 to 10 μm.
The carbon fiber reinforced composite material according to claim 1, wherein the acrylonitrile-styrene copolymer has a number average molecular weight of from 18,000 to 22,000.
The carbon fiber reinforced composite material according to claim 1, wherein the carbon fiber reinforced composite material further comprises 0.2 to 0.6 parts by weight of the antioxidant and 0.4 to 0.8 parts by weight of the lubricant.
The carbon fiber reinforced composite material according to claim 5, wherein said antioxidant comprises n-octadecanol of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and three At least one of [2.4-di-tert-butylphenyl]phosphite.
The carbon fiber reinforced composite material according to claim 5, wherein the lubricant comprises at least one of zinc stearate and ethylene bis stearamide.
A method for preparing a carbon fiber reinforced composite material according to any one of claims 1 to 7, characterized in that it comprises:

Mixing the acrylonitrile-butadiene-styrene copolymer, the acrylonitrile-styrene copolymer and an auxiliary agent in parts by weight to obtain a mixed material;

The mixed material is mixed with the carbon fibers and extruded and granulated.
The method for preparing a carbon fiber reinforced composite material according to claim 8, wherein the step of extruding the granulation after mixing the mixed material with the carbon fiber comprises: mixing the mixture at 200 to 230 ° C After melting and melting, it is mixed with the carbon fibers, kneaded and melted at 180 to 220 ° C, extruded and granulated, and cooled at 25 to 45 ° C.
The method for preparing a carbon fiber reinforced composite material according to claim 9, wherein the carbon fiber reinforced composite material is prepared by an extruder, and the temperature setting of the extruder comprises: a temperature in the T1 region of 80 to 120 °C, T2 zone temperature is 180-220 °C, T3 zone temperature is 180-220 °C, T4 zone temperature is 180-230 °C, T5 zone temperature is 190-230 °C, T6 zone temperature is 180-220 °C, T7 zone temperature The temperature is 170-210 °C, the temperature in the T8 zone is 170-210 °C, the temperature in the T9 zone is 170-210 °C, the temperature in the T10 zone is 170-210 °C, the temperature in the T11 zone is 180-220 °C, and the temperature in the T12 zone is 180-220 °C. And the temperature in the nose area is 190 to 230 °C.