JP4618649B2 - Acetylcellulose resin composition - Google Patents

Description

  The present invention relates to an acetyl cellulose resin composition, and in particular, can be widely applied to the field of molding materials formed by melt molding by injection molding, extrusion molding, profile extrusion molding, blow molding, film / sheet molding, The present invention relates to a biodegradable or low environmental load acetylcellulose resin composition.

Synthetic resins synthesized from petroleum raw materials are represented by polyethylene, polypropylene, polystyrene, vinyl chloride, polyester, polyamide and the like, and are widely used from daily necessities to industrial products. The convenience and economy of these synthetic resins have greatly supported our lives, and synthetic resins are the foundation of the petrochemical industry.
Therefore, the production volume of synthetic resin produced in Japan reaches about 15 million tons per year, and about 1/3 of it is discarded. Waste disposal by incineration and landfill is no longer possible. Has reached. In recent years, movements such as resource recovery and recycling have become active, and with the addition of synthetic resin to the Containers and Packaging Recycling Bill enacted in 2000, powerful and efficient recovery and reuse of synthetic resin Is expected to be required. However, in view of the huge amount of synthetic resin produced, it is difficult to recycle, such as being used for applications that are difficult to recover, and it is unlikely that it can be fully recovered and reused.
Synthetic resin products that dissipate in the natural environment are becoming more and more prominent year by year, which has become a major social problem, such as an increase in the need to protect wild animals and the destruction of the living environment.

Such environmental problems are getting closer year by year, and the environment agency and other governments and local governments need to take full-scale measures.
In the synthetic resin market, there is an active movement for degradability in the natural environment, and a biodegradable resin is developed that eventually decomposes even if dumped outdoors. On the other hand, materials closer to nature are demanded from measures against toxic gases generated during the incineration of synthetic resins, and the demand for biodegradable resins is also increasing from some of the measures for incineration.

Biodegradable resins are resins that can be decomposed by microorganisms in soil, seawater, rivers, and lakes. Besides the demand for direct contact with the natural environment, it is not efficient to recycle synthetic resin waste, Deployment to costly applications is expanding rapidly. Biodegradable resins are increasingly recognized for their value in terms of measures against dissipated waste, and their use is expected to expand further in the future.
Currently, the construction of commercial compost is progressing in various places, and on the other hand, the sale of household compost for individual consumers has started, and development of biodegradable materials is expected in various places. In addition, the Ministry of International Trade and Industry established a practical application study committee, and the movement toward the promotion of biodegradable materials has become active. Furthermore, globally, it is predicted that a significant part of the demand for synthetic resins with annual production of 100 million tons will be occupied by biodegradable resins, and the 21st century is truly a full-scale biodegradable market. Is expected to spread.
As biodegradable materials and environmentally low load materials that are currently in practical use, aliphatic polyesters, modified starches, polylactic acids, various composite materials using these resins as matrices, polymer alloys, and the like are known.

In recent years, it was discovered that acetyl cellulose resin has a biodegradable function, but acetyl cellulose resin can be handled at a lower cost than other biodegradable resins and has no dependence on petroleum resources. The demand is expected to expand rapidly. The acetyl cellulose resin used as such a biodegradable material is disclosed in the following publicly known documents.
JP-A-4-142344 JP-A-6-49275 JP-A-9-241425

  However, the acetyl cellulose resin has several problems in obtaining a molded product by being melt processed by various molding methods like a general-purpose synthetic resin. For example, the melting point of the acetyl cellulose resin is around 280 ° C., which is higher than the decomposition point, and a large amount of plasticizer must be mixed in order to lower the melting point to a temperature suitable for melt processing. However, the acetyl cellulose resin not only changes the melting behavior as the degree of acetyl group substitution changes, but also slightly changes the compatibility with the plasticizer. Accordingly, there is no acetyl cellulose resin plasticizer that is optimal for all acetyl group substitution ranges. Moreover, when a plasticizer is blended in a large amount, moldability is lowered. Furthermore, unlike ordinary synthetic resins, there are many problems in melt processing, such as being susceptible to thermal degradation by pelletizing to obtain a composition, and being prone to generate stimulating acetic acid gas during melting. .

As plasticizers having good compatibility with acetylcellulose resins, phthalate plasticizers such as dimethyl phthalate (DMP), diethyl phthalate (DEP), and dibutyl phthalate (DBP) are generally known. However, although phthalate plasticizers are excellent in compatibility with acetylcellulose resins, they have a strong irritating odor due to gas generated by volatilization and decomposition of plasticizers when melted. There is a problem in the working environment such as the plasticizer separated from the composition floating on the surface of the cooling water tank into which the composition is charged.
As other plasticizers, polyethylene glycol, polypropylene glycol and the like are common as examples of glycol plasticizers. These glycol plasticizers are inferior in plasticizing ability of acetyl cellulose resin, and cannot be mixed in large quantities, and there are problems such as separation of acetyl cellulose and plasticizer in the compound manufacturing work and the melt molding process. is there. In addition, there is a problem in that in order to obtain a uniform and smooth molded product, the melt stability is insufficient and the molded product cannot be melted uniformly, resulting in a melt fracture (unevenness on the molded product surface) on the surface of the molded product. Further, the plasticizer bleeds out on the surface of the molded product due to the influence of environmental humidity and temperature.

In addition, a phosphate ester plasticizer represented by triphenyl phosphate (TPP) is also used, but in order to plasticize and stabilize, a considerably large amount of mixing is required, and like a glycol plasticizer, There is a problem to melt uniformly.
Furthermore, as an aliphatic plasticizer, for example, adipic acid ester is used because it has a biodegradation function. However, it is generally incompatible with acetylcellulose resin and is used only for adipic acid ester having a considerably low molecular weight. Can not do it. Moreover, even when used for low molecular weight adipic acid esters, it cannot be mixed in a large amount, lacks in melt stability of the composition, cannot be melted uniformly, and it is difficult to obtain a stable molded product.
Furthermore, triacetylglycerides obtained by acetylating three hydroxyl groups, so-called triacetin, are also known as plasticizers. However, when triacetin alone is used as a plasticizer, a considerably large amount of mixing is required to obtain processing stability, and there is a problem that the physical properties of the composition are deteriorated.
Furthermore, the compatibility of the acetyl cellulose resin with the plasticizer varies depending on the degree of acetyl group substitution. Therefore, when a single known plasticizer listed above is used for an acetyl cellulose resin having a wide range of acetyl group substitution, there is a limit to improving melt processability, and acetyl cellulose having a wide range of acetyl group substitution. It is difficult to obtain a melt-molded product made of a resin.

  On the other hand, when a specific glycerin derivative is added as a plasticizer to an acetyl cellulose resin, a resin composition having excellent processability can be obtained. However, when this resin composition is injection-molded, if a molding machine subject to any restrictions, such as a molding machine with a small screw driving force, a molding machine with a large screw compression ratio, or a molding machine with a small L / D, is used. There is a problem that stability is poor and molding cannot be performed stably. When extrusion molding is performed, molding may be difficult if a molding machine with restrictions such as a molding machine with a small screw driving force and a molding machine with a small die open area is used. For example, when molding is performed with an extrusion molding machine for vinyl chloride resin, there is a problem that the motor load becomes high and molding cannot be performed, and the discharge amount cannot be increased.

  The present invention solves the above-mentioned problems of the prior art, is particularly excellent in injection molding, extrusion molding, and profile extrusion molding, is biodegradable or low environmental load type, and uses wood flour as an organic filler. An object of the present invention is to provide an acetylcellulose resin composition from which a molded article having a wood-like texture can be obtained.

The present invention relates to (A) 100 parts by weight of acetyl cellulose resin having a biodegradable acetyl group substitution degree of 1.9 to 2.9, and (B) a plasticizer represented by the following general formula (1) and (C) 5 to 100 parts by weight of a plasticizer represented by the following general formula (2) [However, (B): (C) blending ratio = 1 to 99% by weight: 99 to 1% by weight, (B) + (C) = 100 wt%], and (D) wood flour, rice husk flour, refined pulp, straw, paper, cotton, rayon sufu, cellulose and 100 parts by weight of the total amount of components (A) to (C) It relates acetyl cellulose resin composition, characterized by containing a combination of 5 to 200 parts by weight per 100 parts by weight of the total amount of at least one organic filler selected from the coconut husk powder (a) ~ (C) component .

CH ₂ ^{-O-R 1}
｜
CH—O—R ² (1)
｜
CH ₂ ^{-O-R 3}
(The formula ^R 1 to R ³ are the same or different and are an acyl group of 8 to 14 acyl group and / or carbon atoms having 2 carbon atoms, at least one of which is an acyl group of 8 to 14 carbon atoms .)

CH ₂ ^{-O-R 4}
｜
CH-O-R ⁵ (2)
｜
CH ₂ ^{-O-R 6}
(In the above formula, R ^{4 to} R ⁶ are the same or different and are a hydrogen atom and / or an acyl group having 2 carbon atoms, at least one of which is an acyl group having 2 carbon atoms.)

The acetyl cellulose resin composition of the present invention was further selected from (E) propylene glycol monostearate, stearic acid, and metal soap with respect to 100 parts by weight of the total amount of the components (A) to (C) . It is preferable to contain 0.01 to 5 parts by weight of at least one lubricant. Moreover, it is preferable that the said (D) component processed by the surface treating agent which consists of at least 1 sort (s) chosen from the group of a silane coupling agent, a titanium coupling agent, and a fatty acid (metal salt).

According to the present invention, it is a biodegradable or environmentally low-load resin that does not emit toxic gas even when incinerated, and is suitable for injection molding, extrusion molding, profile extrusion molding, blow molding, film / sheet molding, etc. An acetylcellulose resin composition suitable as a resin composition that can be provided can be provided.
In particular, as the organic filler, the use of wood flour and the like, moldability well enhanced, is also the cost of high biodegradable resin, and even higher moldings designability texture of wood tone Can be obtained.

Acetyl cellulose resin can be said to be a low environmental load polymer material because it has lower calorie calorie than ordinary synthetic resin and does not generate toxic decomposition gas.
As the acetyl cellulose resin in the present invention, a normal acetyl cellulose resin can be used. For example, purified cotton linter or high-purity wood pulp is used as a raw material. As an industrial process for producing an acetyl cellulose resin, a mixed acid method, a methylene chloride method, a benzene method, and the like are known, but a mixed acid method is generally used, and a cellulose raw material is pretreated, acetylated (acetylation reaction). ), Saponification ripening reaction, and obtained through washing / purification / dehydration / drying steps.
The degree of acetylation is adjusted by controlling the hydrolysis conditions in the deacetylation reaction performed in the aging reaction step, and an acetyl cellulose resin having the desired degree of acetyl group substitution is obtained.

  The acetyl group substitution degree of the acetyl cellulose resin in the present invention is 1.9 to 2.9, preferably 1.9 to 2.6, and more preferably 2.0 to less than 2.5. When it is less than 1.9 or exceeds 2.9, the production productivity is remarkably reduced.

The plasticizer used in the present invention is a glycerin derivative, and (B) at least one plasticizer selected from the group of compounds represented by the general formula (1), and (C) the general formula ( At least one plasticizer selected from the compound group represented by 2) is used at a composition ratio that is a blending ratio within a specific range.
The component (B) is a glycerin derivative having at least one acyl group having 8 to 14 carbon atoms, and the component (C) is a glycerin derivative having at least one acyl group having 2 carbon atoms.
Examples of the component (B) include monocapryl diacetyl glyceride, monolauryl diacetyl glyceride, dilauryl monoacetyl glyceride and the like.
(B) A component can be used individually by 1 type or in combination of 2 or more types.
Examples of the component (C) include acetyl monoglyceride and triacetyl glyceride.
(C) A component can be used individually by 1 type or in combination of 2 or more types.
The blending ratio of the above component (B): component (C) is (B) + (C) = 100 wt%, 1 to 99 wt%: 99 to 1 wt%, preferably 5 to 95 wt%: 95 to 5 wt%, more preferably 10 to 90 wt%: 90 to 10 wt%. When the blending ratio of the component (B) and the component (C) is outside the above range, there are problems such as difficulty in processing stability of the compound and molding stability of the molded product, and wide processing of the acetylcellulose resin composition. It is difficult to respond to the situation.

  The total amount of the component (B) and the component (C) is 5 to 100 parts by weight, preferably 10 to 80 parts by weight, and more preferably 20 to 60 parts by weight with respect to 100 parts by weight of the acetylcellulose resin. If the blending amount is less than 5 parts by weight, it cannot be processed unless the processing temperature is raised during mixing, kneading and molding, the thermal deterioration of the resin is accelerated, the coloring becomes stronger, and the acetic acid gas Is likely to occur. On the other hand, if the amount exceeds 100 parts by weight, compound productivity is reduced because mixing with the resin takes a long time when the plasticizer is mixed with the acetylcellulose resin, and the appearance and dimensionality of the molded product are adjusted depending on the processing conditions. It becomes difficult.

Next, in the present invention, (D) the organic filler enhances the molding processability, gives the resulting molded article a design appearance such as a wood texture, and also reduces the cost of the biodegradable resin. is there. As the (D) organic fillers, wood powder, chaff powder, purified pulp, straw, paper, cotton, Reyo Nsu off, cellulose and coconut husk powder is used. Furthermore, if necessary, these are processed with at least one surface treatment agent selected from the group of silane coupling agents, titanium coupling agents and fatty acids (metal salts), or a small amount thereof. Examples thereof include organic fillers containing a white inorganic pigment. In consideration of moldability, cost merit and the like, wood powder is particularly preferable.
The addition amount of this (D) organic type filler is 5-200 weight part with respect to 100 weight part of total amounts of (A)-(C) component. Considering the wood texture and moldability, 15 to 110 parts by weight is preferable. If it is less than 5 parts by weight, the desired moldability and wood texture cannot be obtained. On the other hand, if it exceeds 200 parts by weight, the manufacturability and moldability of pellets become difficult.

Next, (E) lubricant is polyethylene wax, oxidized polyethylene wax, fatty acid wax, glycol fatty acid ester wax, glycerin fatty acid ester wax, fatty acid ester wax, citrate ester wax, montan acid ester wax, montan acid partially saponified ester Examples thereof include wax and dipentaerythritol ester wax. Any of them can be used, but those having biodegradability, those derived from natural products, and those not derived from fossil resources are preferable. In addition, although a general polyethylene wax as a lubricant is effective in reducing the motor load of the extruder during molding, it may deteriorate the appearance and transparency of the molded product. In addition, glycerin monostearate is effective in reducing the motor load of the extruder and is excellent in appearance and transparency of the molded product, but even a small amount of addition may cause blooming. On the other hand, propylene glycol monostearate, stearic acid, and metal soap are particularly preferable, and the effect of a lubricant can be obtained, so that no trouble occurs.
The propylene glycol monostearate, stearic acid, and metal soap can be used in combination.
The addition amount of this (E) lubricant is 0.01-5 weight part with respect to 100 weight part of total amounts of (A)-(C) component. In consideration of moldability and the like, 0.01 to 3 parts by weight is preferable. If it is less than 0.01 parts by weight, the desired moldability cannot be obtained, while if it exceeds 5 parts by weight, there are problems such as bloom.

  The resin composition of this invention can also use (E) component together with (A)-(D) component. For example, when (D) wood powder is added in a small amount (for example, in the case of 20 parts by weight or less) to give a wood texture, the addition of the component (E) suppresses an increase in torque at the time of extrusion, and is excellent A moldable composition is obtained. Furthermore, by blending an appropriate amount of (E), a composition having always excellent moldability can be obtained regardless of the amount of (D) added.

  In the acetylcellulose resin composition of the present invention, organic and inorganic fillers containing other polymer materials may be optionally added as long as the effects of the present invention are not impaired. Since the composition of the present invention is particularly intended for biodegradability and low environmental load, organic additives such as arbitrarily added polymer materials have biodegradable properties or are harmless to nature. Is preferable. For example, examples of the polymer material include aliphatic polyester, microbial polyester, polycaprolactone, polylactic acid, modified starch, and polyesteramide. Examples of the colorant include bengara, carbon black, and titanium oxide. Inorganic fillers such as calcium carbonate, talc, mica, calcium silicate, and silica derived from natural ores, special fillers such as barium sulfate and metal powder can be added as appropriate according to the purpose. .

  The resin composition of the present invention can be directly melt-molded after the components (A) to (D) or the components (A) to (E) are melt-kneaded. However, it is preferably a method of molding after forming a pellet compound which is a normal secondary processing raw material form, and when mixing various fillers other than the acetyl cellulose resin and the plasticizer, various components are uniformly pre-dispersed. The stability of the resin composition can be obtained.

  As a mixer used in the processing of the pellet-like compound, a blender for the purpose of preliminary dispersion, distribution, and diffusion mixing is used as the preliminary mixer. Typical examples of the blender include a ribbon blender, a Henschel mixer (super mixer), a tumbler mixer, a tumble mixer, and an air blender. These premixers are selected according to the type of plasticizer and auxiliary material to be filled and the diffusion level, but for mixing the acetylcellulose resin and the plasticizer mixture, a ribbon blender or a Henschel mixer is desirable, and A blender that can heat the composition with water vapor, electricity, or the like is preferable.

  When the resin composition of the present invention is produced, a premixer is used to add a plasticizer, an organic filler and / or a lubricant to the acetylcellulose resin, and the resulting composition is preferably 60 ° C to 160 ° C. When blended by heating up to 70 ° C, more preferably 70 to 140 ° C, uniform mixing of the plasticizer and the resin is facilitated, and moisture contained in the resin or wood flour can be removed, thereby improving productivity. While improving, the stability with respect to the melt processing of a resin composition improves. If the hot-up temperature is less than 60 ° C., the plasticizer composition is not sufficiently uniformly mixed, resulting in stickiness, hindering the supply to the kneader, impeding productivity, and melting the resin composition. May be non-uniform. On the other hand, when the hot-up temperature exceeds 160 ° C., the resin melts in the premixer and forms a lump, which again cannot be supplied to the kneader.

  Next, although it is a melt kneader, generally a single screw, a twin screw extruder, a Banbury type, a roll type, etc. are mentioned. These can also be selected according to the form, purpose, and productivity of the composition, and melt-kneaded to produce the composition of the present invention. Pelletization can be done by any method, but it is possible to cut the molten composition after taking it into a plate shape, or to create pellets with a die cutter while extruding the molten resin composition from a die into a string shape. A cutting method is preferred.

The resin composition of the present invention is melted in each molding machine, and can be molded by various molding machines such as injection molding, extrusion molding including profile extrusion, blow molding, calendar molding, vacuum molding, emboss molding, film / sheet molding, etc. Is possible. The molding machine may have a general specification that is usually used. It can also be molded by a molding machine used for the purpose of molding PVC.
For example, in the case of injection molding, a general injection molding machine can be used. In general, when a pellet-like compound is used, the finished product is good and the physical performance is stable. Thus, the resin composition of this invention can select a shaping | molding method according to a use.

  In any molding process, care must be taken in moisture absorption of raw materials, and pre-drying and moisture absorption countermeasures during molding are important. In other words, it is desirable to store the pellets obtained by the hot-cut method in an aluminum bag or the like, and form them immediately after opening.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further more concretely, this invention is not limited at all by these Examples. In addition, unless otherwise indicated, the part and% in an Example are a weight part and weight%.

Sample preparation (A) component;
As the acetyl cellulose resin, Daicel Chemical Industries, Ltd., the type having an acetyl group substitution degree of 2.1 (A-1) and the type 2.4 (A-2) were used.
(B) component;
Monocapryl diacetylglyceride manufactured by Riken Vitamin Co., Ltd. was used.
(C) component;
(C-1) Monoacetylglyceride manufactured by Riken Vitamin Co., Ltd. was used.
(C-2) Triacetin (triacetylglyceride) manufactured by Daihachi Chemical Co., Ltd. was used.
(D) component;
Wood powder 120M (average particle size = 120 μm) manufactured by Obayashi Kogyo Co., Ltd. was used.
(E) component;
(E-1) Propylene glycol monostearate manufactured by Riken Vitamin Co., Ltd. was used.
(E-2) New Nippon Rika Co., Ltd. product and stearic acid were used.

Sample preparation method As a premixer, a Henschel mixer was used to mix resin, plasticizer, wood powder, lubricant, and the like at a predetermined ratio, and stirring was performed until the composition temperature reached 100 ° C. As a kneading machine, a melt-kneading was performed at a cylinder setting temperature of 180 to 200 ° C., a screw rotation speed of 40 rpm, and a feeder rotation speed of 10 rpm using a screw diameter 65 mm different direction twin screw extruder (motor capacity: 25 KW). While extruding the molten resin composition from a die in a string shape, a pellet compound was produced by a hot cut method in which pellets were produced with a die cutter.

Premixing workability The fluidity of the composition during heating and stirring using a premixer was evaluated. The evaluation criteria are as follows.
Good: The resin powder in the composition is uniformly mixed with a plasticizer and other additives.
Normal: The composition is slightly agglomerated, but can be supplied to the kneader. Poor: The composition melts and agglomerates and is non-uniform, or mixing of the resin powder and the plasticizer mixture is difficult. It is impossible to supply to the kneading machine because it occurs. In addition, since kneading | mixing and pellet preparation cannot be performed when it is inferior, evaluation of kneading | mixing workability | operativity, a molded article external appearance, etc. could not be performed.

The pellet manufacturability was evaluated from the uniformity of melting of the composition during the melt-kneading operation using the kneader, the load of the kneader operating motor, and the appearance of the obtained pellet. The evaluation criteria are as follows.
Good kneading and melting stability : The state in which the composition is uniformly melted and kneaded Normal: The kneaded composition has a slight melting defect, but the pellet can be produced.
Best load of kneading motor : The motor load of the twin screw extruder is stable at less than 45A, and the pellet can be manufactured even if the rotation speed of the feeder is increased to 15 rpm.
Good: Stable when the motor load of the twin screw extruder is less than 45A.
Large: A state in which the motor load of the twin-screw extruder is 45A or more and less than 60A, and it is necessary to limit the material supply amount (when the feeder rotation speed needs to be 8 rpm or less).
Extra large: When the motor load of the twin-screw extruder is 60A or more, making pellets difficult.
Pellet appearance good: A state where a stable and uniform pellet can be obtained Normal: A state where the pellet size is slightly different, but a stable pellet can be obtained Defect: A state where a pellet cannot be obtained stably

The injection molding was performed using an injection molding machine with a clamping pressure of 80 t, a cylinder set temperature of 160 to 200 ° C., and a mold set temperature of 40 ° C. The injection moldability was evaluated by workability at the time of molding and the appearance of the obtained molded product by a film gate type plate (width 6 × length 6 × thickness 0.3 cm). The evaluation criteria are shown below.
Best injection molding : Cylinder hopper side temperature is 160 ° C, injection pressure is less than 50% of the maximum pressure, and stable molding is possible Good: Cylinder hopper side temperature is 180 ° C, injection pressure is maximum Stable molding with less than 80% setting against pressure Defective: Cylinder hopper side temperature is 180 ° C, injection pressure is 80% or less setting, stable molding is not possible.
Good appearance of injection molded product : When there is no abnormality on the surface of the molded product.
Defect: When the surface of the molded product is visually colored, or there are flash marks, uneven gloss, or irregularities.

Extrusion was carried out using a 20 mm single-screw extruder, extruded at a cylinder set temperature of 190 ° C. to 210 ° C. using a tape-shaped die at a screw rotation speed of 10 rpm and 20 rpm, and evaluated for workability and appearance of the molded product. The evaluation criteria are shown below.
Extrudability best: A state in which the extrusion load (torque) is lower than 5 kg / cm 2 at a screw rotation speed of 20 rpm and can be stably molded.
Good: The extrusion load (torque) is lower than 5 kg / cm 2 at a screw rotation speed of 10 rpm, and the mold can be stably molded.
Poor: Extrusion load (torque) exceeds 5 kg / cm 2 at a screw speed of 10 rpm.
Extruded product appearance is good: When there is no abnormality on the surface of the product by visual inspection.
Normal: When the surface of the molded product has a slight melt fracture, but can be used depending on the application.
Defect: When the surface of the molded product has melting unevenness and melt fracture visually.

Examples 1-7
According to the formulation of Table 1, resin compositions were prepared and evaluated. The results are shown in Table 1. All the examples were particularly excellent in pellet productivity, injection moldability, and extrusion moldability, and could be easily molded by a PVC molding machine.

Example 8
98 parts by weight of pellets produced by adding 2 parts by weight of titanium oxide as a colorant to the formulation of Example 5 and 2 parts by weight of pellets produced by adding 2 parts by weight of Bengala as a colorant to the formulation of Example 1 When extrusion molding was carried out after dry blending, the wood grain pattern was expressed in the molded product, and a molded product with a wood texture with particularly high design was obtained.

Example 9
Using a Henschel mixer, the blended formulation of Example 5 was subjected to a stirring operation until the composition temperature reached 100 ° C., and the powdery formulation obtained was directly injection molded and extruded. It was particularly excellent in injection moldability and extrusion moldability, and could be easily molded by a PVC molding machine.

Example 10
According to the formulation of Example 5, the blended formulation was stirred using a Henschel mixer until it reached 50 ° C. As a kneading machine, melt kneading was performed at a cylinder set temperature of 180 to 200 ° C., a screw rotation speed of 40 rpm, and a feeder rotation speed of 10 rpm using a twin screw extruder with a screw diameter of 65 mm. While extruding the molten resin composition from a die in a string shape, a pellet compound was produced by a hot cut method in which pellets were produced with a die cutter. When producing a pellet compound, poor melting was observed, and although some foaming phenomenon was observed in the pellet compound, pellet production was possible. Although both extrusion molding and injection molding are possible, a slight foaming phenomenon was observed in the molded product.

Comparative Examples 1-4
Resin compositions were prepared and evaluated according to the formulation of Table 2. The results are shown in Table 2. Comparative Examples 1 to 4 are examples in which the (D) organic filler and (E) lubricant of the present invention are not blended, and although pellet production and molding are possible, in pellet production, discharge (production per time) The amount) is small compared to the examples, the moldability is also inferior to the examples, and the product productivity is limited.

Claims (2)

(A) With respect to 100 parts by weight of acetyl cellulose resin having a biodegradable acetyl group substitution degree of 1.9 to 2.9, (B) a plasticizer represented by the following general formula (1) and (C) 5 to 100 parts by weight of a plasticizer represented by the general formula (2) [However, (B) :( C) blending ratio = 1 to 99% by weight: 99 to 1% by weight, (B) + (C) = 100 wt%], and (D) wood flour, rice husk flour, refined pulp, straw, paper, cotton, rayon sufu, cellulose, and coconut powder relative to 100 parts by weight of the total amount of components (A) to (C) acetyl cellulose resin composition, characterized by containing a combination of 5 to 200 parts by weight per 100 parts by weight of the total amount of the selected at least one organic filler (a) ~ (C) component.

CH ₂ ^{-O-R 1}
｜
CH—O—R ² (1)
｜
CH ₂ ^{-O-R 3}
(The formula ^R 1 to R ³ are the same or different and are an acyl group of 8 to 14 acyl group and / or carbon atoms having 2 carbon atoms, at least one of which is an acyl group of 8 to 14 carbon atoms .)

CH ₂ ^{-O-R 4}
｜
CH-O-R ⁵ (2)
｜
CH ₂ ^{-O-R 6}
(In the above formula, R ^{4 to} R ⁶ are the same or different and are a hydrogen atom and / or an acyl group having 2 carbon atoms, at least one of which is an acyl group having 2 carbon atoms.)
Furthermore, with respect to 100 parts by weight of the total amount of the components (A) to (C) , at least one lubricant selected from (E) propylene glycol monostearate, stearic acid and metal soap is added in an amount of 0.01 to 5 The acetyl cellulose resin composition according to claim 1, comprising parts by weight.