KR20110103272A - Bio composite materials comprising microalgae wastes and method for preparing the same - Google Patents

Abstract

The present invention relates to a bio-composite and a method for manufacturing the same, and more particularly, the bio-composite according to the present invention includes the microalgae by-products left after the extraction process to produce biodiesel from the microalgae. Since the biocomposite according to the present invention is excellent in environmentally friendly characteristics, dimensional stability, etc., it can be applied to various industrial articles.

Description

BIO COMPOSITE MATERIALS COMPRISING MICROALGAE WASTES AND METHOD FOR PREPARING THE SAME

The present invention relates to a bio-composite material and a method for manufacturing the same, and more particularly, to a bio-composite material and a method for manufacturing the same excellent in environmentally friendly properties, storage modulus, dimensional stability.

In general, polymer composites, which are widely used in the automobile and building industries, mostly use glass fiber as a reinforcement material. Glass fiber is causing harmful problems in terms of energy and environment because it is harmful to the human body and difficult to recycle. . Recently, in order to reduce the amount of glass fibers harmful to humans, bio-composites using natural fibers as reinforcement materials have been used.

Bio-composites are about 30% lighter than glass-fiber reinforced polymer composites, so when applied to automotive parts, they are high-tech new materials that can expect energy saving by improved fuel efficiency (1.6%). The wear rate of the machine is low and light, which can save 80% of production energy in the manufacturing process. In particular, natural fibers (about 5 won / g) are about one-fourth the price of glass fibers (20 won / g), and are lighter than glass fibers (density: 2.55 g / cm3), toughness and specific modulus. This is excellent. Biocomposites manufactured and used until recently are mostly cellulose-based reinforcing materials, which mainly use powders or fibers obtained from wood and natural fiber non-wood. However, cellulose-based reinforcing materials have various characteristics depending on the growth conditions, growth sites, growth periods, etc. of wood or natural fibers, and in particular, even one fiber may have a different composition and size at each site. In many cases, each part of the biocomposite material has different characteristics. In addition, there is a fear of side effects due to forest damage caused by the use of wood-based reinforcement, or the cultivation of non-wood-specific special plants such as flax, hemp, which is widely used as a reinforcement of the recent biocomposites.

Therefore, recently, researches for utilizing bio materials, which are eco-friendly materials, as high-functional materials have been actively conducted around the world.

The present invention is to provide a bio-composite material and a method for manufacturing the same excellent in environmentally friendly properties, dimensional stability.

The present invention provides a biocomposite material comprising microalgal by-products.

In addition,

1) preparing a microalgal by-product;

2) preparing a mixture by mixing the microalgae by-product and the polymer matrix; And

3) forming a bio-composite using the mixture

It provides a method for producing a bio-composite comprising a.

The present invention also provides an article comprising the biocomposite.

The bio-composite according to the present invention includes microalgae by-products as reinforcing materials, thereby exhibiting excellent eco-friendly properties, storage modulus, dimensional stability, and the like. The microalgae by-products are extracted from lipids to produce biodiesel from microalgae. Since the remaining by-products can be used, the by-products that have been conventionally treated as wastes can be easily utilized.

1 is a view showing a lipid extraction system of microalgae according to an embodiment of the present invention.
Figure 2 is a view showing the shape of the microalgae by-product according to an embodiment of the present invention.
3 is a view showing the elemental component analysis of the microalgae by-product according to an embodiment of the present invention.
Figure 4 is a diagram showing the thermal decomposition characteristics of microalgae by-products and red algae according to an embodiment of the present invention.
Figure 5 is the density of the microalgae by-product reinforcement bio composite material according to an embodiment of the present invention (natural fiber reinforcement 30 wt%, BRAF: red algae fiber, KE: kenaf fiber, HWP: hardwood pulp, Cotton: cotton pulp, micro algae: microalgae by-product).
6 is a view showing the density of the bio-composite material according to the change in the content of the microalgae by-product according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating (a) storage modulus and (b) tan δ of a polypropylene matrix, a microalgae by-product reinforced biocomposite, and a red algae fiber-reinforced biocomposite according to one embodiment of the present invention.
8 is a view showing the storage modulus at −30 ° C. of a polypropylene matrix, a microalgae by-product reinforced biocomposite, and a red algae fiber-reinforced biocomposite according to one embodiment of the present invention.
9 is a diagram illustrating (a) dimensional stability and (b) thermal expansion coefficient according to temperature increase of a polypropylene matrix, a microalgae by-product reinforced biocomposite and a red algae fiber reinforced biocomposite according to an embodiment of the present invention.
10 is a view showing (a) dimensional stability and (b) thermal expansion coefficient of the microalgae by-product reinforcement biocomposites according to the content of the reinforcing material according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail.

Bio-composites according to the invention is characterized in that it comprises microalgal by-products.

In recent years, research and development and practical use of algae as bioenergy, composite materials and carbon materials have been actively promoted. Algae grows quickly and can be artificially cultured and have useful biopolymers, which can be used to develop eco-friendly materials.

In particular, microalgae contain pigments such as chlorophyll, carotenoids, or phycobilins, and some of them are classified as plants or broadly classified as bacteria in the broader sense of plant growth and reproduction through photosynthesis. However, the variety and number of them are so diverse that they can be compared with ordinary microorganisms. These microalgae were considered to be low-use biomass that produce organic matter from inorganic materials by using solar energy, but now biofuels are being developed by using various natural resources. Is attracting attention as one of. In addition, microalgae can also be obtained in a variety of shapes, such as spheres depending on the species (species).

In general, microalgae grow faster than above-ground plants, produce higher living organisms, and have the potential to be an important bioindustrial material in that they can produce fresh, seawater, and other substances with specific physiological functions at high concentrations. have. In fact, industrial applications using microalgae are very diverse, including wastewater treatment, air pollution purification (carbon dioxide immobilization), aquaculture feed, health food materials, bioactive materials production, processing materials, and pharmaceutical materials.

In the biocomposite according to the present invention, the microalgae by-products may use the by-products remaining after the lipid extraction process to produce biodiesel from the microalgae, the microalgae by-products of the reinforcement in the bio-composite material Can play a role.

The biocomposite may include a polymer matrix in addition to the microalgal by-products.

The polymer matrix is not particularly limited, and may include biodegradable polymers, general purpose polymers, and the like known in the art. The biodegradable polymers include polylactic acid (PLA), polycaprolactone (PCL), a blend of PCL and starch, polybutylene succinate (PBS), and the like, which are decomposed by the action of microorganisms. In addition, the general purpose polymer may include polypropylene, polyethylene, polycarbonate, and the like, but is not limited thereto.

The polymer matrix may have a spherical shape, a cylinder shape, a powder shape, or the like, and may adjust the thickness of the biocomposite according to the content of the polymer matrix.

In the biocomposite according to the present invention, the contents of the microalgae by-products and the polymer matrix may be independently 1 to 70 wt%. When the content of the biomaterial in the biocomposite material is less than 1 wt%, a problem may occur in which it is difficult to expect a role as a reinforcing material for improving the environmentally friendly or mechanical properties as the biocomposite material, and when it exceeds 70 wt% Since the polymer matrix is not sufficiently wetted between the biomaterials, the interface adhesion properties may be deteriorated, thereby causing a problem that the mechanical properties of the biocomposite are deteriorated.

In addition, the method for producing a bio-composite according to the present invention comprises the steps of 1) preparing microalgae by-products; 2) preparing a mixture by mixing the microalgae by-product and the polymer matrix; And 3) forming a biocomposite using the mixture.

In the method for producing a bio-composite according to the present invention, the microalgae by-product of step 1) means a by-product remaining in addition to the lipids after the extraction process to produce biodiesel from the microalgae.

Step 1) may include drying the microalgae by-products to remove moisture in the microalgae by-products.

In the method of manufacturing a biocomposite according to the present invention, the polymer matrix of step 2) may include crushing the polymer matrix into powder in advance for effective mixing with the microalgal by-products. Since the detailed content of the polymer matrix is the same as described above, specific details thereof will be omitted.

In the method of manufacturing a bio-composite according to the present invention, step 3) is a step of forming a bio-composite using a mixture of microalgae by-products and a polymer matrix, and a method known in the art may be used. For example, the mixture may be placed in a metal mold and formed by a compression molding method, but is not limited thereto.

The present invention also provides an article comprising the biocomposite.

Bio-composites according to the present invention can exhibit excellent eco-friendly properties, storage modulus, dimensional stability, etc., it can be used in electrical and electronic component cases, automobile interior and exterior materials, building interior and exterior materials.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited thereto.

< Example >

Analysis of the microalgae components used in the present invention, the characteristics of the microalgae by-products were analyzed and a bio-composite material using the same as a reinforcing material was prepared. In addition, the thermal and mechanical properties of bio-composites using microalgae by-products as reinforcements were analyzed and compared with those of bio-composites using red algae fibers as reinforcements.

The microalgae used in this experiment were purchased from BioMist Technology (Korea) as Chlorella vulgaris sp. And stored in a 4 ° C refrigerator before the experiment. Carbohydrate, protein, chlorophyll, lipid content was analyzed by drying the microalgae stored in the refrigerator with a freeze dryer (FD5512, Ilsin, Korea) for at least 3 days.

1) Analysis method

Carbohydrates were analyzed according to the phenol-sulfuric acid method (Tatsuya et al., 2005) using glucose as a standard. After appropriately diluting the lyophilized microalgae, 250 μL of the microalgae solution was placed in a 5 mL glass jar and mixed by adding 250 μL of 5% (v / v) phenol. The glass bottle was placed in ice water, 1.25 mL of sulfuric acid was added to the mixture, and reacted for 30 minutes in an 80 ° C. constant temperature water bath. The reaction solution was cooled at room temperature for 10 minutes and quantified by measuring absorbance at 492 nm.

Proteins were extracted according to Wynne and Rhee (1986) method and analyzed by Bradford method (Bradford, 1976) using bovine serum albumin (Sigma, USA) as a standard. After properly diluting the lyophilized microalgae, 1 mL of the microalgae solution was centrifuged at 13,000 rpm for 10 minutes to remove the supernatant, 1N NaOH was added, and heated at 100 ° C. for 10 minutes to extract the protein. The reaction solution was cooled to room temperature and centrifuged at 13,000 rpm for 10 minutes to obtain a supernatant. The supernatant was quantified by reacting with a Bradford reagent (Pro-measureTM, iNtRON Biotechnology, Korea) and measuring absorbance at a wavelength of 595 nm.

Chlorophyll was analyzed by modifying the Richmond method (2004). After properly diluting the lyophilized microalgae, 1.0 mL of the microalgae solution was placed in a 1.7 mL Eppendorf tube and centrifuged at 13,000 rpm for 10 minutes to remove the supernatant. 1 mL of a 90% (v / v) methanol solution was added to the precipitate, mixed vigorously with a vortex mixer for 10 minutes, and reacted for 10 minutes in a 65 ° C thermostat. The reaction solution was left in a 4 ° C. refrigerator for 30 minutes and then centrifuged at 13,000 rpm for 10 minutes. The amount of chlorophyll was quantified by taking a supernatant and measuring absorbance at wavelengths of 649 nm and 665 nm, respectively.

Lipids were analyzed by soxhlet extraction (Gao et al., 2008). 30 g of lyophilized cells were placed in a cylindrical filter, lightly blocked with cotton wool, and then inserted into an extractor. 182 mL of chloroform-methanol (2: 1, vol / vol) was charged to a weighed receiver, connected to an extraction tube, and crude lipid was continuously extracted for more than 12 hours. The amount of crude oil was calculated by volatilizing the solvent remaining in the water phase using a rotary evaporator and measuring the weight difference. The microalgae by-products remaining after the extraction of the lipids were used for the production of bio-composites. The crude oil extraction system is shown in FIG. 1.

Fatty acid content and composition were analyzed by extracting lipids using Kochert method and then modified Lepage and Roy method. As a standard, a mixture of fatty acid methyl ester mixtures Mix RM3 and Mix RM5 (Supelco, USA) was used. About 50mL of the cell culture was collected and centrifuged at 4,000 rpm for 10 minutes using a high-speed centrifuge (Combi-514R, Hanil, Korea) to remove the supernatant, and then washed and centrifuged twice.

The cells were sufficiently dried for at least 4 days with a freeze dryer (FD5512, Ilsin, Korea). Into a glass tube with a Teflon stopper (11 mL, DH.GL28020, Daihan Scientific, Korea), weigh about 10 mg of dry cells weighed and inject 2 mL of chloroform-methanol (2: 1, vol / vol) for 10 minutes at room temperature. Mix with a test tube vortex mixer (Vorex Genius 3. Ika, Italy).

1 mL (500 μg / L) of chloroform, 1 mL of methanol, and 300 μl of sulfuric acid containing nonadecanoic acid as an internal standard were sequentially added to the glass tube, followed by mixing for 5 minutes. The tube was placed in a constant temperature water bath and reacted at 100 ° C for 10 minutes. After cooling to room temperature, 1 mL of distilled water was injected, mixed vigorously for about 5 minutes with a mixer, and centrifuged at 4,000 rpm for 5 minutes to separate layers. The lower layer (organic phase) was extracted with a disposable PP syringe (Norm-ject, Germany), filtered with a disposable 0.22㎛ PVDF syringe filter (Millex-Gv, Millipore, USA), and then gas chromatography with an automatic injector (Model 7890, Agilent, USA).

2) Analysis result of microalgae

The results of the component analysis of the microalga Chlorella vulgaris sp. Are shown in Table 1 below. Crude lipids were the most common at 25.9%, including 24.1% protein, 20.5% carbohydrate, and 7.7% fatty acid. In addition, the content of chlorophyll was analyzed to be 4.9%. Others were chlorophyll, protein, carbohydrates, and crude lipids, which are mainly impurities and minerals.

3) Characterization of microalgae by-products

Extraction of lipids from microalgae was used as basic data to confirm the possibility of use as a reinforcement material for bio-composites. The shape and thermal characteristics of microalgae by-products were analyzed using electron scanning microscope and thermal analyzer.

The shape of the microalgae by-products analyzed by the scanning electron microscope and the elemental components analyzed by EDAX are shown in FIGS. 2 and 3, respectively. Microalgae by-products have a spherical diameter of 10 ~ 100㎛, the extract is out of the appearance is not smooth appearance. Potassium, calcium, phosphorus, sulfur and magnesium were found in the skin of the microalgal by-products analyzed by EDAX.

Pyrolysis characteristics of microalgae by-products were measured by thermogravimetric analyzer (TGA Q-500, TA Instrument). The sample was made into a powder and placed in a platinum container for measuring TGA (Platinum pan) 20mg was measured at room temperature to 500 ℃ at 10 ℃ / min.

Pyrolysis characteristics of the microalgae by-products analyzed by TGA are shown in FIG. 4. Pyrolysis characteristics of microalgae by-products showed major pyrolysis peaks of microalgal by-products at moisture peaks below 100 ° C and at 225 ° C, 268 ° C and 323 ° C. Each peak can be thought of as a pyrolysis curve of sugars, proteins, chlorophyll and the like remaining after removing lipids from microalgae.

For reference, the pyrolysis characteristics of red algae were compared. Even in the case of red algae, when the extract was not completely removed, a wide pyrolysis peak was shown at 220 to 330 ° C., whereas the red algae fiber from which the extract was completely removed was a single pyrolysis peak at around 360 ° C. You can see that. Thus, the broad peaks in the microalgal by-products can be interpreted as being present without the various extracts being completely removed.

< Manufacturing example > Bio-composites using microalgae by-products Produce

We analyzed the feasibility of manufacturing lightweight bio-composites with environmentally friendly microalgae by-products. As the polymer matrix of the bio composite material, polypropylene (Polypropylene (PP), Kolon Glotech Co., Ltd.), which is a general-purpose polymer, was used. Polypropylene is in the form of a fiber having a length of 40 ~ 120㎜, in the present invention was used by chopping the polymer fibers (chopping) for excellent dispersion with the reinforcing material in the production of bio-composites. This cutting process not only effectively mixes the fibers, but also reduces the large volume of polypropylene fibers that are added when manufacturing the biocomposite.

Microalgae by-products were used after drying for at least 24 hours in a dryer at 100 ℃ to remove moisture. The shredded polypropylene fibers were mixed with the microalgal by-products using a domestic mixer, and then the mixture was placed in a metal mold to prepare a biocomposite by compression molding. Biocomposites were prepared by varying the microalgal by-product content to 20, 30, 40, 50 wt% and compared with those of red algae fiber reinforced polypropylene biocomposites.

Red algae fibers are extracted and bleached to remove mucus and form pulp (Bleached red algae fiber, BRAF) .They are dried at 100 ° C for 24 hours in a convection dry oven to remove moisture, and at home. Primary grinding was performed with a mixer. Although the primary crushed red algae fibers were dissociated to some extent compared to the initial stage, secondary grinding was performed by using a high speed grinder in the form of agglomeration. The high speed mill was operated for 30 to 60 seconds at a speed of 6,000 rpm. Cylindrical sieves are mounted around the inner rotor of the high speed mill to dissociate the fibers as well as to prevent the dissociated fibers from clumping together.

In the production method of the microalgae by-product and the red algae fiber-reinforced biocomposite using the polypropylene as a matrix, the mixture was placed in a metal mold, and the temperature was raised to about 3.8 ° C / min for 40 minutes from room temperature to 180 ° C. After the inside of the metal mold reaches 180 ° C., the matrix is sufficiently melted and maintained for 20 minutes to allow the resin to flow smoothly between the fibers, and after being pressurized at 1,000 psi (6.894 MPa) for 10 minutes to room temperature. Cooled. Biocomposite samples were prepared in 50 mm x 50 mm size. The prepared biocomposite was demolded in a metal mold and left at room temperature for at least 24 hours to prepare specimens for thermomechanical properties and mechanical analysis using precision cutters.

< Experimental Example > Characterization of Bio Composites

The density, thermomechanical and dimensional stability characteristics of polypropylene biocomposites with microalgae by-products and red algae fibers were investigated. In order to observe the thermomechanical properties of biocomposites, dynamic, thermal and thermal analysis and thermogravimetric analysis were analyzed.

1) density

The density of the biocomposite with the addition of the microalgae by-product as the 30 wt% reinforcement is shown in FIG. 5 in comparison with the density of the polypropylene matrix and other natural fiber reinforced biocomposites. Pure polypropylene has a density of 0.86 g / cm ³ and microalgal by-product reinforcement biocomposites are heavier than 0.87 g / cm ³ , which is the density of biocomposites with kenaf fibers as reinforcement, but red algae fibers, hardwood pulp, cotton It can be seen that it is relatively lighter than bio-composite with pulp as a reinforcing material.

In addition, the density change of the biocomposite material in which the content of the microalgae by-products was changed from 20 wt% to 50 wt% is shown in FIG. 6. As the content of the microalgal by-products increases, the density of the biocomposite also gradually increases. The biocomposite had a density of 1.04 g / cm ^{3 at} 50 wt% fiber input, which was about 17.3% higher than that of pure polypropylene matrix.

2) kinetic characteristics

The storage modulus and Tan δ of biocomposites were analyzed using a dynamic mechanical analyzer (DMA Q-800, TA Instrument). The size of each specimen was 35 mm long, about 11 mm wide, and about 2 mm thick, and measured at 5 ° C. per minute to −100 to 100 ° C.

Liquid nitrogen was used to cool the specimen down to -100 ° C or to 100 ° C, and the air bearing gauge was maintained between 60 and 65 psi for effective vibration. The test was conducted in single cantilever mode as a vertical form, and the frequency used was fixed at 1 Hz and the oscillation amplitude was kept at 0.2 mm. Before proceeding with the experiment, the position and compliance of the clamps were always corrected to obtain reliable results.

The storage modulus and tan δ at -30 ° C. to 100 ° C. of the biocomposite using the microalgae by-product as a reinforcement are shown in FIG. 7 in comparison with the polypropylene matrix and the red algae fiber reinforced biocomposite. In addition, the storage modulus at −30 ° C. was compared with FIG. 8. The storage modulus of the microalgae by-product reinforced biocomposites was similar to that of the polypropylene matrix, and the storage modulus of the red algae fiber-reinforced biocomposites was significantly higher than that of the pure polypropylene matrix.

Although tan δ of microalgae by-product reinforced biocomposites was lowered, the decrease was relatively smaller than that of red algae fiber reinforced biocomposites. Decreasing tan δ values mean that the reinforcing fibers effectively compensate for the damping of the polypropylene matrix itself. On the other hand, the glass transition temperature (Tg) values measured at tan δ were similar at lower temperatures than the polypropylene matrix in both the microalgae by-products or the red algae fiber reinforced biocomposites.

The damping phenomenon is a physical phenomenon in which the amplitude of dynamic vibration, noise, and alternating current decreases as energy decreases. The reason for the damping phenomenon is that it stops if the swing is not continuously pushed. There are various mechanical attenuation phenomena, which include friction that converts kinetic energy into heat, and when alternating current enters and exits the resonant electric circuit of a radio or television, electric resistance is generated and energy is reduced. . As such, the intrinsic attenuation of the matrix is reduced due to the addition of the reinforcing material, thereby greatly improving the inherent storage modulus of the matrix.

3) Dimensional stability

The thermal expansion behavior and the coefficient of thermal expansion (CTE) of biocomposites were analyzed using a Thermomechanical Analyzer (TMA Q-400, TA Instrument). The temperature was raised to 5 ° C./min from room temperature to 100 ° C., and the probe around which the degree of expansion of the specimen was measured was maintained in a nitrogen atmosphere of 100 ml / min. The specimens were prepared in a size of 7 mm, 7 mm, and 2 mm in thickness. In particular, the specimens were cut and stored in a desiccator to minimize moisture absorption at room temperature.

The thermal expansion characteristics of the biocomposite using the microalgae by-product as a reinforcing material are shown in FIG. 9 in comparison with the polypropylene matrix and the red algae fiber reinforced biocomposite. Figure 9 (a) is a linear representation of the change in the thickness of the bio-composite material from room temperature to 100 ℃, Figure 9 (b) is a comparison of the coefficient of thermal expansion reduction of the coefficient of thermal expansion is the dimensional stability of the temperature change This means improved.

When the content of microalgae by-product reinforcing material was 40 wt%, the dimensional stability of the biocomposite was similar to that of the red algae fiber-reinforced biocomposite, and it was analyzed that the dimensional stability was significantly higher than that of the polypropylene matrix. The thermal expansion coefficient of the biocomposite material was also reduced by 25 to 28% compared to the polypropylene matrix, improving dimensional stability. These results indicate that microalgae by-products and red algae fibers hold the thickness expansion of the polypropylene polymer matrix with increasing temperature, so that biocomposites are required for dimensional stability due to temperature changes. For example, it can be used effectively in the case of electrical and electronic parts.

The dimensional stability and thermal expansion coefficient of the biocomposite according to the change of the content of the microalgae reinforcement were compared to FIG. 10. As the content of microalgae increases, the dimensional stability of the biocomposite increases and the coefficient of thermal expansion decreases. When 50 wt% of the microalgal by-product reinforcement was added, the biocomposite had a 56.5% reduction in thermal expansion coefficient compared to the polypropylene polymer matrix.

From the above results, it can be seen that the bio-composite according to the present invention can easily utilize the by-products left after the extraction process to produce biodiesel from the by-products, that is, microalgae that were conventionally treated as waste. In addition, it can be seen that the bio-composite material according to the present invention can exhibit excellent eco-friendly properties, storage modulus, dimensional stability, etc., by including microalgae by-products as reinforcing materials.

Claims (10)

Biocomposites containing microalgal by-products. The method of claim 1,
The microalgae by-product is a bio-composite material characterized in that the microalgae by-products remaining after the lipid extraction process to produce biodiesel from the microalgae. The method of claim 1,
The microalgae by-product is a bio-composite comprising at least one pigment selected from the group consisting of chlorophyll, carotenoids and phycobilins. The method of claim 1,
The bio-composite material is characterized in that it further comprises a polymer matrix. The method of claim 1,
The polymer matrix is a group consisting of polylactic acid (PLA), polycaprolactone (PCL), a blend of polylactic acid (PCL) and starch, polybutylene succinate (PBS), polypropylene, polyethylene and polycarbonate Bio-composite comprising at least one selected from. 1) preparing a microalgal by-product;
2) preparing a mixture by mixing the microalgae by-product and the polymer matrix; And
3) forming a bio-composite using the mixture
Method for producing a bio-composite comprising a. The method of claim 6,
The step 1) further comprises the step of drying the microalgae by-products to remove moisture in the microalgae by-products. The method of claim 6,
Step 3) is a method for producing a bio-composite, characterized in that carried out by compression molding (compression molding). An article comprising the biocomposite of any one of claims 1 to 5. 10. The method of claim 9,
The article is an electrical and electronic component case, an automobile interior, exterior material or building interior, exterior material.

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