JP7370640B2 - Method for producing cellulose acetate composition and its production system - Google Patents

Description

The present invention relates to a technology for producing cellulose acetate compositions for use in biodegradable plastics.

Cellulose acetate is attracting attention as a biodegradable plastic because its components are naturally occurring and decompose in soil and seawater. Although cellulose acetate itself does not have thermoplasticity, it can be heat-molded using an appropriate plasticizer.

Patent No. 6599197

However, it has been pointed out that the heat-molded cellulose acetate composition described above has inferior mechanical properties compared to common general-purpose plastics. Further, cellulose acetate is hydrolyzed to have a low molecular weight, and is finally decomposed into carbon dioxide and water. However, it has been pointed out that the biodegradation rate of cellulose acetate in nature is slow, and it may be difficult to meet the certification standards for biodegradable plastics. For this reason, cellulose acetate does not have sufficient functional conditions when biodegradable plastics are used to replace the uses that have traditionally been performed by general-purpose plastics.

The present invention was made in consideration of these circumstances, and the purpose is to provide a technology for producing a cellulose acetate composition that has sufficient functionality as a biodegradable plastic that can replace the uses that have been used by general-purpose plastics. do.

In the method for producing a cellulose acetate composition according to the present invention, a step of mixing a liquid plasticizer while stirring cellulose acetate granules and adjusting the temperature to a range of 40°C to 70°C by frictional heat to produce a first mixture; , a step of mixing the first mixture and a filler to produce a second mixture, and a step of setting and kneading the second mixture at a temperature that causes viscous flow.

The present invention provides a technology for producing a cellulose acetate composition that has sufficient functionality as a biodegradable plastic that can replace the uses traditionally used by general-purpose plastics.

1 is a schematic diagram of a production system for a cellulose acetate composition according to a first embodiment of the present invention. FIG. 2 is a schematic diagram of a production system for a cellulose acetate composition according to a second embodiment of the present invention. 1 is a flowchart illustrating a method for producing a cellulose acetate composition according to an embodiment of the present invention. A table showing comparative examples and examples in which the effects of this embodiment were confirmed.

(First embodiment)
Embodiments of the present invention will be described below based on the accompanying drawings. FIG. 1 is a schematic diagram of a cellulose acetate composition manufacturing system 10a (10) (hereinafter simply referred to as "manufacturing system 10a") according to a first embodiment of the present invention. In this way, the manufacturing system 10a includes the first mixing container 11 that mixes the liquid plasticizer 26 while stirring the granules of cellulose acetate 25 to produce the first mixture 21, and the first mixture 21 and the filler 27. The second mixing container 12 mixes the second mixture 22 to produce the second mixture 22, and the kneader 30 sets the second mixture 22 at a temperature that causes viscous flow and kneads the second mixture 22.

In the first embodiment, first, cellulose acetate 25 and a plasticizer 26 are mixed to form a first mixture 21, and then a filler 27 is mixed to form a second mixture 22. This makes it possible to mix cellulose acetate 25, plasticizer 26, and filler 27 as comparative examples at the same time, or to mix cellulose acetate 25 and filler 27 before mixing plasticizer 26. In comparison, a cellulose acetate composition with excellent functionality can be obtained.

Further, in the first embodiment, the first mixture 21 and the second mixture 22 are mixed in separate mixing containers 11 and 12, respectively. However, the present invention is not limited to this form, and the filler 27 may be added to the mixing container in which the first mixture 21 is produced, and the second mixture 22 may be produced in the same mixing container.

Cellulose acetate 25 is commonly obtained, and varieties with a degree of acetylation of 60 or less, preferably between 49 and 60 are preferred. Further, in order to adjust the basic physical properties and moldability of the composition to a preferable level, multiple types of cellulose acetate 25 may be used in combination. This cellulose acetate 25 is supplied from the first supply container 15 to the first mixing container 11 . The supply method from the first supply container 15 includes a batch method in which cellulose acetate 25 is intermittently supplied in unit quantities that are processed at a time in the first mixing container 11, and a method in which the supply speed of cellulose acetate 25 is controlled. There is a continuous method in which the water is supplied continuously.

This cellulose acetate 25 is preferably in the form of granules with an average particle size in the range of 0.1 mm to 1.0 mm. If the average particle size is smaller than 0.1 mm, handling becomes difficult, and the granules fly up, resulting in a decrease in workability. In addition, if this maximum particle size is larger than 1 mm, the specific surface area of the cellulose acetate 25 supplied to the first mixing container 11 becomes small, and the plasticizer 26 introduced does not sufficiently wet the granules of the cellulose acetate 25. They may separate without any problem. However, the average particle size of cellulose acetate 25 applied to the present invention is not limited to the above range.

The plasticizer 26 includes phthalate esters, trimellitate esters, aliphatic dibasic acid esters, phosphate esters, acetate esters, ricinoleate esters, sulfonamide radical dibasic acid esters, and citric acid esters. Although any ester type can be used, acetate ester type and citric acid ester type are preferable. These plasticizers can be used alone or in combination depending on the purpose. Furthermore, in order to adjust the basic physical properties and moldability of the composition to desirable ones, a plurality of these plasticizers 26 may be used in combination. The blending amount of these plasticizers 26 is adjusted so that the plasticizer 26 is contained in a range of 10 to 100 parts by weight, preferably 20 to 40 parts by weight, per 100 parts by weight of cellulose acetate 25.

When the above-mentioned batch method is used, the plasticizer 26 is added in a unit amount to be processed at one time with the output end 18 of the first mixing container 11 closed. In this case, after supplying the entire unit amount of cellulose acetate 25, the plasticizer 26 may be added while operating the first mixing container 11, or the cellulose acetate 25 may be supplied and the cellulose acetate may be added while operating the first mixing container 11. It is conceivable to do this at the same time as the input of 25.

In addition, when the plasticizer 26 is fed in the continuous method described above, the cellulose acetate 25 is fed while the first mixing container 11 is operated with the output end 18 of the first mixing container 11 open, and the supply rate is adjusted. and cellulose acetate 25 whose charging speed was adjusted are simultaneously charged. Note that it is preferable to spray the plasticizer 26 into the first mixing container 11 from the viewpoint of generating a uniform first mixture 21 by using the sprayer 16, but it is preferable to let it flow down from a pipe (not shown) instead of spraying it. You can.

The first mixing container 11 is not particularly limited, and a mixer such as a tumbler mixer, Henschel mixer, ribbon mixer, or kneader can be used. The rotational speed of the stirring blade in the first mixing container 11 is preferably 200 rpm or more, preferably 400 rpm or more, and more preferably 500 rpm or more. By realizing such high-speed rotation, the cellulose acetate 25 can be heated by the frictional heat of kinetic energy without providing a heating means in the first mixing container 11 (of course, a heating means may be provided). Can be done. The temperature at this time is adjusted to a range of 40°C to 70°C, preferably 50°C to 60°C. Thereby, the viscosity of the plasticizer 26 can be lowered, the wettability can be improved, and the plasticizer 26 can be evenly and evenly dispersed in the cellulose acetate 25.

The filler 27 is broadly classified into mineral-based (inorganic) fillers, biomass-based inorganic fillers, biomass-based organic fillers, and biodegradable resin fillers. Among these, mineral-based (inorganic) fillers include talc, charcoal, silica, mica, and the like. The particle size distribution of these particles is preferably 5 μm to 150 μm. Fine particles smaller than 5 μm and coarse particles larger than 150 μm have a negative effect on compound performance.

Examples of the biomass-based inorganic filler include eggshells and seashells. The thin film that adheres to eggshells contains proteins and amino acids, and when these amino acids decompose under heat, hydrogen sulfide gas is generated during manufacturing and molding. For this reason, it is desirable to remove the thin film from the eggshell before use. Examples of biomass-based organic fillers include wood powders such as cedar, cypress, bamboo, and coffee grounds, industrially separated cellulose powder, cellulose fiber, hemicellulose powder, nanocellulose powder, and modified lignin. These also preferably have a particle size distribution of 5 μm to 150 μm. Examples of the biodegradable resin filler include PBS (polybutylene succinate), PBAT (polybutylene adipate terephthalate), and PHBH (poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)). These fillers can be used alone or in combination.

These fillers 27 are supplied from the second supply container 17 to the second mixing container 12 . The amount of the filler 27 is adjusted so that the filler 27 is included in the range of 10 to 300 parts by weight per 100 parts by weight of the cellulose acetate 25. If the amount of filler 27 is less than 10 parts by weight, the biodegradation rate as a biodegradable plastic will not be sufficiently ensured. If the amount of filler 27 is more than 300 parts by weight, the continuity of the matrix phase of cellulose acetate 25 cannot be maintained.

In the case of the above-mentioned batch method, with the output end 19 of the second mixing container 12 closed, the filler 27 is supplied from the second supply container 17 to the first mixing container 10 by the unit amount to be processed at one time. The first mixture 21 is added from

In addition, in the case of the above-mentioned continuous method, while operating the second mixing container 12 with the output end 19 of the second mixing container 12 open, the filler 27 whose supply rate is adjusted and the filler 27 whose input speed is adjusted are used. 1 and mixture 21 at the same time. The second mixing container 12 stirs the charged first mixture 21 and filler 27 and sends out the generated second mixture 22 to the kneading machine 30 .

In another embodiment, when the filler 27 is added to the mixing container in which the first mixture 21 is produced and the second mixture 22 is produced in the same mixing container, the frictional heat generated when the first mixture 21 is produced is As a result, the moisture contained in the filler 27 can be removed and the second mixture 22 effectively dried can be produced.

The second mixing container 12 contains known additives such as flame retardants, flame retardant aids, stabilizers (antioxidants, ultraviolet absorbers, heat stabilizers, light stabilizers, etc.), colorants, antistatic agents, and lubricants. , an anti-blocking agent, a dispersant, an antibacterial agent, a deodorant, etc. may be added to the second mixture 22. However, it is desirable that the amount of these additives be such that the basic performance of the cellulose acetate composition is maintained in a well-balanced manner. Further, the order in which these additives are mixed into the first mixture 21 can be before, after, or simultaneously with the filler 27.

Among these, examples of antioxidants include phenol-based and phosphite-based antioxidants. These can be used alone or in combination. Examples of the dispersant include metal soaps and waxes, with zinc stearate and magnesium stearate being particularly preferred. Examples of deodorants include epoxidized soybean oil and epoxidized linseed oil. These deodorants make cellulose acetate odorless by absorbing acetic acid generated during hydrolysis. Epoxidized soybean oil also has the effect of improving fluidity when melted.

The kneading machine 30 includes a charging means 31, a driving means 32, a kneading means 33, a dehydrating means 34, and a granulating means 35. Here, the kneading means 33 is composed of a cylinder forming the outside and a screw (not shown) that rotates inside the cylinder by the driving force of the driving means 32. Here, the cylinder and screw are set at a temperature in the range of 120° C. to 250° C. at which the first mixture 21 flows viscous.

The second mixture 22 is charged into the charging means 31 from the second mixing container 12 . Then, the introduced second mixture 22 is heated and kneaded by a screw that rotates inside the cylinder, the first mixture 21 becomes viscous fluid, and the filler 27 is uniformly distributed in the matrix of the viscous fluid while being suppressed from re-agglomerating. It will become dispersed.

When the viscous fluid of the second mixture 22 passes through the dehydration means 34, the closed system is switched to an open system and the water contained therein is vaporized and removed. This dehydration means 34 can be configured with an opening that opens the second mixture 22 to atmospheric pressure. Furthermore, a pressure reducer may be provided to reduce the internal pressure of the kneader 30 to promote vaporization of water. Removal of water has the effect of suppressing hydrolysis of the cellulose acetate composition.

The second mixture 22 is discharged from the most downstream of the kneading means 33 in a state in which a dispersed phase of the fine filler 27 is uniformly formed in the matrix phase of the first mixture 21 (cellulose acetate 25 and plasticizer 26). do. The discharged kneaded body of the second mixture 22 is branched into bundles in the granulating means 35, cooled and solidified, and then cut into pellet-shaped cellulose acetate compositions.

This pellet-like cellulose acetate composition is reheated and melted in an injection molding machine (not shown), and then injected into a mold to form a bulk molded product, or subjected to stretching processing (e.g., inflation method, calendar processing method). , T-die method, blowing method, etc.) to make a film-like molded product, or foamed to make a foam molded product, and serves as a raw material for manufacturing general polymer processed molded products.

In FIG. 1, a continuous kneader 30 such as a single-screw or multi-screw extruder is illustrated, but a batch-type kneader such as a kneader or a Banbury mixer may also be used. The kneader 30 may be appropriately employed as long as it can perform stirring (kneading) while adjusting the closed space to a temperature at which the first mixture 21 flows viscous.

A method for producing a cellulose acetate composition according to an embodiment of the present invention will be described based on the flowchart in FIG. 3 (see FIG. 1 as appropriate). First, a liquid plasticizer 26 is mixed with the granulated cellulose acetate 25 while stirring in the first mixing container 11 to generate a first mixture 21 (S11). Next, the first mixture 21 and the filler 27 are mixed in the second mixing container 12 to generate a second mixture 22 (S12). Then, the second mixture 22 is kneaded by the kneader 30 set at a temperature that causes viscous flow (S13).

This kneaded body is cooled and solidified to produce a cellulose acetate composition cut into pellets (S14). Then, the pellets are reheated and melted using an injection molding machine, and then injected into a mold to produce a molded product (S15).

(Second embodiment)
FIG. 2 is a schematic diagram of a manufacturing system 10b (10) showing a second embodiment of the method for manufacturing a cellulose acetate composition according to the present invention. A method for producing a cellulose acetate composition according to the second embodiment will be described with reference to the flowchart in FIG. 3. Note that in FIG. 2, parts having the same configuration or function as those in FIG.

In the method for producing a cellulose acetate composition according to the second embodiment, first, a granular body of cellulose acetate 25 is directly charged from a supply container 15 to a charging means 31 of a kneader 30, and while being stirred by this kneader 30, a liquid is formed. A plasticizer 26 is mixed to produce a first mixture 21 (S11). Note that this liquid plasticizer 26 is injected into the kneading machine 30 by a pump. In this step, cellulose acetate 25 is set at a temperature at which it becomes viscous and fluid, and is kneaded with plasticizer 26.

Next, the filler 27 is put into the kneader 30, and the first mixture 21 and the filler 27 are mixed to produce the second mixture 22 (S12). Note that this filler 27 is injected into the kneading machine 30 by a pump. Then, in the kneader 30, the second mixture 22 is set at a temperature that causes viscous flow and kneaded (S13). In this way, the granules of cellulose acetate 25, the liquid plasticizer 26, and the filler 27 are charged in this order from upstream to downstream of the kneader 30.

Next, the granulating means 35 cools and solidifies the kneaded body to produce a cellulose acetate composition cut into pellets (S14). Then, the pellets are reheated and melted using an injection molding machine, and then injected into a mold to produce a molded product (S15). Note that when a deodorant is added in the method for producing a cellulose acetate composition according to the second embodiment, it is desirable to add the deodorant downstream of the filler 27.

FIG. 4 is a table showing comparative examples and examples in which the effects of this embodiment were confirmed. Note that Examples 1 to 10 correspond to the first embodiment, and Example 11 corresponds to the second embodiment.

(Comparative example 1)
The cellulose acetate 25 used was a product of Daicel Corporation with a degree of acetylation of 55%. The blending amount of the plasticizer 26 is 42 parts by weight of triacetin alone or a mixture of triacetin and acetyl tributyl citrate per 100 parts by weight of cellulose acetate. Further, the additives were added in an amount of 0.3 parts by weight of a phenolic antioxidant, 0.3 parts by weight of a phosphite antioxidant, and 1.0 parts by weight of Zn stearate as a dispersant. The formulation of Comparative Example 1 does not contain filler 27, unlike Comparative Example 2 and Examples described later.

That is, the cellulose acetate composition according to Comparative Example 1 (see FIG. 1) is prepared by mixing a liquid plasticizer 26 while stirring granules of cellulose acetate 25 in a first mixing container 11 to produce a first mixture 21. The first mixture 21 is kneaded in a kneader 30 at a temperature at which it becomes viscous and fluid. Therefore, in Comparative Example 1, there is no step of producing the second mixture 22 in which the filler 27 is mixed.

Specifically, a first mixture 21 of cellulose acetate 25 and a plasticizer 26 is produced using a high-speed mixer set at 500 rpm/min as the first mixing container 11 . Furthermore, the first mixture 21 and additives were mixed using a ribbon blender, which is a low-speed mixer set at 120 rpm/min. As the extruder 30, CK70HT (screw diameter 70 mm, L/D=44) manufactured by Taiwanese manufacturer CKF was used. The screw rotation speed was set at 300 to 600 rpm, and the extrusion temperature was set at 190-200-200-200-200-210-210°C (dice) from the charging means 31.

The kneaded body discharged from the extruder 30 is molded into pellets, cooled, reheated in an injection molding machine, melted, and then injected into a mold to obtain various basic properties (MFR, tensile strength, flexural modulus). , impact strength) were prepared. The deodorizing effect was evaluated through human sensory testing. The basic performance of the cellulose acetate composition of Comparative Example 1 is as shown in FIG.

(Comparative example 2)
In Comparative Example 2, 65 parts by weight of talc is further added to the composition of Comparative Example 1 as filler 27. That is, the cellulose acetate composition according to Comparative Example 2 will be described with reference to FIG. The three fillers 27 are mixed together. Then, the resulting mixture is kneaded in a kneader 30 at a temperature that causes viscous flow. Therefore, in Comparative Example 2, there is no step of preferentially mixing the cellulose acetate 25 and the liquid plasticizer 26 to generate the first mixture 21.

The basic performance of the test piece prepared using the cellulose acetate composition of Comparative Example 2 is clearly inferior to that of the Examples described below. Therefore, various tests (MFR, tensile strength, flexural modulus, impact strength) were not conducted.

(Example 1)
In Example 1, the method for producing a cellulose acetate composition according to the first embodiment of the present invention was applied to the same composition as Comparative Example 2. Specifically, a first mixture 21 of cellulose acetate 25 and a plasticizer 26 is produced using a high-speed mixer set at 500 rpm/min as the first mixing vessel 11 . Then, a second mixture 22 of the first mixture 21, filler 27, and additives is produced using a ribbon blender, which is a low-speed mixer set at 120 rpm/min, as the second mixing container 12. The extruder 30 is the same as that described in Comparative Example 1. Regarding the basic performance of the cellulose acetate composition of Example 1, an improvement in flexural modulus compared to Comparative Example 1 was observed.

(Example 2)
In Example 2, 2.0 parts by weight of epoxidized soybean oil is further added to the composition of Example 1 as an additional deodorant. Then, the same method for producing a cellulose acetate composition as in Example 1 is applied so that this epoxidized soybean oil is also mixed together to produce the second mixture 22. Regarding the basic performance of the cellulose acetate composition of Example 2, improvements in MFR and deodorizing effect were observed compared to Example 1 due to the inclusion of epoxidized soybean oil.

(Example 3) (Example 4) (Example 5) (Example 6) (Example 7) (Example 8)
Example 3-8 had the same composition as Example 2, but instead of talc, 65 parts by weight of charcoal (Example 3), 65 parts by weight of eggshell (Example 4), and 30 parts by weight of cedar wood powder (Example 3) were used. Example 5), 30 parts by weight of cypress wood flour (Example 6), 30 parts by weight of bamboo powder (Example 7), and 30 parts by weight of cellulose powder (Example 8) are blended as the filler 27. The method for producing the cellulose acetate composition is the same as in other Examples. Regarding the basic performance of the cellulose acetate compositions of Examples 1-8, at least the flexural modulus was improved compared to Comparative Example 1 due to the inclusion of various fillers 27.

In the eggshells in Example 4, coarse eggshells were removed using a screen mesh (80 mesh to 100 mesh). When eggshells are used as the filler 27, the amino acids contained therein are thermally decomposed and hydrogen sulfide is generated during manufacturing and molding, but this is deodorized by its deodorizing function.

The wood flour of Example 5 is cedar flour from Toyama Prefecture, and has a moisture content of 10% with a 50 mesh pass. The wood flour of Example 6 is cypress flour from Toyama Prefecture, and has a moisture content of 10% with a 50 mesh pass. The wood flour of Example 7 is bamboo flour from Fukui Prefecture, and has a moisture content of 10% with a 50 mesh pass. Regarding Examples 5, 6, and 7, the water contained in the wood flour can be removed and dried using the frictional heat generated when the cellulose acetate 25 and the plasticizer 26 are stirred and mixed.

As the cellulose powder in Example 8, KC Flock; W400Y, a product of Nippon Paper Industries Co., Ltd., is used. Fine powder grade: moisture: 7% or less, ash: 0.3% or less, apparent specific gravity: 0.4 g/ml or more, pH: 5.0 to 7.5, whiteness: 80 or more, average particle size: 24 μm, 400 mesh pass, 90 wt% or more. By blending cellulose powder as the filler 27, an increase in the filling amount, a significant improvement in tensile strength and heat distortion temperature (numeric display omitted) were observed, and dimensional stability was also improved in the injection molded product.

(Example 9) (Example 10)
In Examples 9-10, 20 parts by weight of PBS (Example 9) and 20 parts by weight of PHBH (Example 10) are further blended into the composition of Example 2 as additional biodegradable resins. The method for producing the cellulose acetate composition is the same as in other examples. Here, PBS (polybutylene succinate) is used in the following grades: FZ71PM, MFR: 22g/10min, density: 1.26, flexural modulus: 630MPa, tensile strength: 30MPa, tensile elongation 30%, MTT/PTT. , PHBH (poly(3-hydroxybutyrate-CO-3-hydroxyhexanoate)) is used grade: X151A, MFR: 3g/10min, density: 1.19, flexural modulus: 850MPa, manufactured by I am using Kaneka products.

Regarding the basic performance of the cellulose acetate compositions of Examples 9-10, an improvement in impact strength was observed compared to Comparative Example 1 and other Examples due to the inclusion of the biodegradable resin.

(Example 11)
In Example 11, the method for producing a cellulose acetate composition according to the second embodiment of the present invention was applied to the same composition as Comparative Example 2 (and Example 2). The extruder 30 is the same as that described in Comparative Example 1. 100 parts by weight of cellulose acetate is directly charged into the kneader 30 from the charging means 31. Next, 42 parts by weight of triacetin as a plasticizer 26 is directly charged into the kneading machine 30 using a quantitative injection system downstream from the position where cellulose acetate is introduced.

Furthermore, downstream of the injection position of the plasticizer 26, 65 parts by weight of talc as the filler 27 is directly fed into the kneading machine 30 using a quantitative feeder. Then, downstream of the injection position of the filler 27, 2.0 parts by weight of epoxidized soybean oil as a deodorizer is directly introduced into the kneading machine 30 using a metering injection system. Regarding the basic performance of the cellulose acetate composition of Example 11, improvements in MFR and flexural modulus were observed compared to Comparative Example 1, and improvements in MFR, tensile strength, and impact strength were also observed compared to Example 2.

DESCRIPTION OF SYMBOLS 10 (10a, 10b)... Manufacturing system (manufacturing system) for cellulose acetate composition, 11... First mixing container, 12... Second mixing container, 15... Supply container, 16... Sprayer, 17... Supply container, 18... Output End, 19... Output end, 21... First mixture, 22... Second mixture, 25... Cellulose acetate, 26... Plasticizer, 27... Filler, 30... Kneader, 31... Input means, 32... Drive means, 33 ...Kneading means, 34... Dehydration means, 35... Granulation means.

Claims (8)

In a first mixing container, a step of mixing a liquid plasticizer while stirring cellulose acetate granules and adjusting the temperature to a range of 40 ° C. to 70 ° C. by frictional heat to produce a first mixture;
mixing the first mixture and a filler in a second mixing container separate from the first mixing container to produce a second mixture;
A step of charging the second mixture into a charging means provided upstream of an extrusion type kneader and kneading it at a temperature that causes viscous flow;
Switching the closed system of the kneading machine to an open system using a dehydrating means to vaporize and remove the water contained therein, and discharging the viscous flowing second mixture from the most downstream of the kneading machine. A method for producing a cellulose acetate composition comprising: In the method for producing a cellulose acetate composition according to claim 1,
A method for producing a cellulose acetate composition, comprising mixing the plasticizer while spraying it to produce the first mixture. In the method for producing a cellulose acetate composition according to claim 1 or 2,
The method for producing a cellulose acetate composition, wherein the filler is at least one mineral filler selected from the group of talc, charcoal, silica, and mica. In the method for producing a cellulose acetate composition according to claim 1 or 2 ,
The method for producing a cellulose acetate composition, wherein the filler is at least one biomass-based inorganic filler selected from the group of eggshells and seashells. In the method for producing a cellulose acetate composition according to claim 1 or 2 ,
The filler is at least one wood-based powder selected from the group of cedar, cypress, bamboo and coffee grounds, or the group of industrially separated cellulose powder, cellulose fiber, hemicellulose powder, nanocellulose powder and modified lignin. A method for producing a cellulose acetate composition comprising at least one biomass-based organic filler selected from. In the method for producing a cellulose acetate composition according to claim 1 or 2 ,
The method for producing a cellulose acetate composition, wherein the filler is at least one biodegradable resin filler selected from the group of PBS, PBAT, and PHBH. In the method for producing a cellulose acetate composition according to any one of claims 1 to 6,
A method for producing a cellulose acetate composition, wherein at least one of epoxidized soybean oil and epoxidized linseed oil is blended as an additive when producing the second mixture. a first mixing container that mixes a liquid plasticizer while stirring cellulose acetate granules and adjusts the temperature to a range of 40°C to 70°C using frictional heat to produce a first mixture;
a second mixing container that is separate from the first mixing container and mixes the first mixture and a filler to produce a second mixture;
an extrusion-type kneader for kneading the second mixture by charging the second mixture into a charging means provided upstream and setting the temperature to a temperature at which it becomes viscous and fluid;
Dehydration means for switching the closed system of the kneading machine to an open system on the upstream side of discharging from the most downstream of the kneading machine to vaporize and remove water contained in the viscous flowing second mixture; A system for producing a cellulose acetate composition, comprising:

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