KR20190022593A - Bio plastic composition comprising wheat bran and Bio plastic film using therefrom - Google Patents

Abstract

The present invention relates to a bio-plastic composition containing wheat bran, which is a food by-product, and a bio-plastic pellet and a film using the same. More specifically, the present invention relates to: the bio-plastic composition containing wheat bran wherein physical properties of the composition are improved and physical properties of the bio-plastic film manufactured thereby are also improved, thereby enabling carbon reduction and replacing existing petroleum-derived plastic products; and the bio-plastic film using the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a bio-plastic composition including wheat bran and a bio-

The present invention relates to a bio-plastic composition including wheat bark, which is a by-product of food, and a bio-plastic pellet and a film using the bio-plastic composition, wherein the physical properties of the composition are improved and the physical properties of the bio- The present invention relates to a bio-plastic composition including a wheat bark and a bio-plastic film using the bio-plastic composition, which can replace petroleum-derived plastic products.

Plastics are high molecular weight materials with high molecular weight. As the molecular weight increases, it changes from gas to liquid and solid. In solid materials, fluidity is deteriorated as the molecular weight increases, but mechanical properties, heat resistance, etc. are improved and properties such as metals, wood, ceramics, and rubber can be used as one of the necessary materials in daily life. Plastic is molded by adding various modifiers, coloring agents, reinforcing materials, filling materials, and the like to the polymer material. Although the properties of plastics are determined by the chemical structure of synthetic resins such as PE, PP, and PVC, they can be modified by changing the properties depending on many factors. In the chemical structure, the main chain and side chain state, end group / terminal group, bridging, stereoregularity due to the molecular weight, molecular weight distribution, , The composition of the copolymer, and the like. In general, compounding is performed in the form of a pellet by adding various additives such as various kinds of additives, a reinforcing agent and a modifying agent to a polymer raw material and preparing a composition suitable for the purpose of use.

In recent years, the amount of plastic waste has increased exponentially with the increase in the amount of various plastics including films used as food packaging materials. In general, plastic wastes are treated by landfilling, incineration or recycling. However, if the waste is incinerated and buried after using petroleum-derived plastic products, toxic gas will be generated, causing air pollution, causing a shortage of landfill space and environmental pollution. Therefore, in order to solve such problems, research and development of eco-friendly plastics capable of reducing carbon have been actively carried out by utilizing natural raw materials using plant-derived by-products or fermentation techniques. However, when such a non-petroleum-derived plant-derived byproduct is used in the development of a plastic composition, the content of the petroleum-based plastic material is reduced and the carbon reduction effect is obtained. However, There is a problem that the physical properties are deteriorated.

In this regard, Korean Patent Laid-Open Publication No. 10-2014-0018004 discloses a composition for a sheet using biomass, Korean Patent Laid-Open Publication No. 10-2014-0094865 discloses a composition for a biomass film, 10-2013-0051840 discloses an eco-friendly bio-based pellet using plant biomass, but no bioplastic composition using a wheat bran has been disclosed.

Korean Patent Publication No. 10-2014-0018004 (published on August 26, 2015) Korean Patent Publication No. 10-2014-0094865 (published on July 31, 2015) Korean Patent Publication No. 10-2013-0051840 (published May 21, 2013)

It is an object of the present invention to provide a bioplastic composition containing a wheat bran containing a polyolefin resin, a whey protein, a wax, an inorganic filler and a surfactant in order to provide a bioplastic composition containing wheat bran.

It is another object of the present invention to provide a bio-plastic pellet and a film containing the bio-plastic composition.

In order to solve the above problems, the present invention provides a bio-plastic composition containing a polyolefin resin, a whey protein, a wax, an inorganic filler and a surfactant.

The polyolefin-based resin may be at least one selected from the group consisting of polyethylene (PE), polypropylene (PP), polybutylene and polymethylpentene.

The polyolefin resin in the composition may be contained in the composition in an amount of 40 to 70% by weight.

On the other hand, the size of the wheat blooms may be 5 to 30 탆, the uniformity of the grain size (PDI) may be 2 or less, and the wheat bloom may be 1 to 10%. And the wheat blood may be contained in the composition in an amount of 10 to 30% by weight.

Meanwhile, the wax may be at least one selected from paraffin wax, liquid paraffin wax, beeswax, mold wax, candelilla wax, polyethylene wax and polypropylene wax, and may be contained in the composition in an amount of 10 to 20% by weight.

The inorganic filler is at least one selected from the group consisting of calcium carbonate, silacar, mica, and talc, and may be included in the composition in an amount of 5 to 20% by weight.

The surfactant may also be selected from the group consisting of fatty acids such as stearic acid, myristic acid, palmitic acid, arachidic acid, oleic acid, linolenic acid and hardened fatty acids, glycerin, butylene glycol, propylene glycol, dipropylene glycol, pentylene glycol, hexylene glycol , Polyethylene glycol and sorbitol, and may be contained in an amount of 0.5 to 5% by weight in the composition.

Meanwhile, the composition may further comprise 10 to 30 parts by weight of a polyolefin-based resin per 100 parts by weight of the total composition.

The present invention also provides a bio-plastic pellet comprising the above composition.

The present invention also provides a bio-plastic film comprising the above composition. The film may further comprise a polyolefin-based resin.

On the other hand, the present invention provides a method for producing a bioplastic composition comprising the steps of: 1) preparing a bioplastic composition containing wheat bran by heating and mixing polyolefin resin, wheat bran, wax, inorganic filler and surfactant; and 2) And cutting and forming the pellet into pellets.

Particularly, the wheat bran can be subjected to classification and pulverization after pulverization before mixing.

The present invention also provides a method for producing a bio-plastic film comprising a polyolefin-based resin in addition to bio-plastic pellets produced by the above-described method.

The bioplastic composition of the present invention has a uniform physical property and a high dispersibility, so that it is possible to use conventional equipment in the production of a film, and there is an effect that holes are not generated at the time of production.

In addition, the bio-plastic film of the present invention has similar physical properties as existing plastic-based films, so that it is possible to use conventional facilities and to provide a bio-plastic film capable of reducing carbon.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a process for producing a pellet comprising a bioplastic composition including wheat bran of the present invention.
FIG. 2 is a photograph showing that a hole is formed when a film is produced using a composition in which the grain size of the grain is not uniform.
3 is a photograph showing the pellets and the film of the bio-plastic composition according to the wheat content.
FIG. 4 is a chart showing the average capacity according to the particle diameter when pulverized, classified and then classified.

The present invention provides a bioplastic composition containing a polyolefin resin, a wheat bran, a wax, an inorganic filler and other additives.

The polyolefin resin of the present invention may be at least one selected from among polyethylene (PE), polypropylene (PP), polybutylene and polymethylpentene, and preferably at least one selected from polyethylene (PE) and polypropylene , And most preferably polyethylene (PE).

The polyethylene may be at least one selected from linear low density polyethylene (LLDPE), low density polyethylene (LDPE) and high density polyethylene (HDPE). In addition, the polyethylene may be one produced by one or more catalysts selected from a metallocene catalyst and a Zeigler-Natta catalyst, but is preferably a catalyst prepared by using a metallocene catalyst . Unlike the Ziegler-Natta catalyst, the metallocene catalyst has a single active site, and the polymer structure can be precisely controlled by a single active site catalyst technique, so that a specific synthesis process can be freely implemented. In particular, M-PE refers to PE synthesized using a metallocene catalyst, and M-PE is superior in workability and quality to other PEs, and produces less bubbles and holes.

The polyolefin resin in the composition may be contained in the composition in an amount of 40 to 70% by weight. When the content is less than 40% by weight, the composition is not easily mixed, pellet processing is not easy, and the physical properties are not uniform during the production of the film. When it is contained in an amount of more than 70% by weight, the inherent color of the wheat in the composition is not maintained and the carbon reduction effect becomes insignificant. However, since the composition of the present invention includes the polyolefin resin within the above range, the composition maintains the inherent color of the wheat, so that bubbles of wheat are not generated during the manufacture of the film, and the same appearance and quality as those of the conventional plastic- .

The wheat bran of the present invention may be a by-product remaining after the production of flour in the biomass. Specifically, the wheat bran may be pulverized, classified, and undifferentiated.

The grain size may be 5 to 30 占 퐉, preferably 10 to 25 占 퐉. When the grain size is smaller than the above-mentioned range, the powder is blown and workability deteriorates, which affects the yield. The melt index (MI) of the composition is increased, and the hardness of the pellets produced by the composition is not constant. Using this, the film processability during film production is low and holes are generated, Tensile strength, elongation, etc.). In addition, the uniformity of the wheat grain is defined as PDI (polydipersity index). The PDI is expressed as the square of the mean of the standard deviation / diameter of the diameter. In the present invention, the PDI value of the wheat flock may be 2 or less, preferably 1.5 or less. If the wheat size uniformity is out of the above range, the compounding properties may be uneven and the dispersibility may be deteriorated. In the PDI range, powders smaller than 30 탆 can be formed to about 80%.

In addition, the wheat bran can have a moisture content of 1 to 10%. When the content of the wheat is lower than the above range, the processing method of the wheat is inefficient. If the content is larger than the range, the properties of the composition are poor and the degree of film processing is low.

The wheat bran can be contained in the composition in an amount of 10 to 30% by weight. If the amount is less than the above range, the inherent color of the wheat flour may not be maintained in the composition. If the flour content is more than the above range, the wheat flour of fine size is aggregated during the composition production process, Strength, elongation ratio, etc.) may be lowered and holes may be generated during manufacture. However, the composition of the present invention can provide the same appearance and quality as existing plastic-based films without the occurrence of bubbles in the production of the film while maintaining the inherent color of the wheat by including the wheat blood within the above range.

The wax of the present invention serves to link the wheat bark with the polyolefin resin and may be any one or more selected from among paraffin wax, liquid paraffin wax, bees wax, candelilla wax, polyethylene wax and polypropylene wax, But it is preferable to use polyethylene wax, and more preferably, one or two selected from low density polyethylene wax (LDPE WAX) and high density polyethylene wax (HDPE WAX) are mixed and used. The wax may be included in the composition in an amount of 10 to 20% by weight.

The inorganic filler of the present invention may be at least one selected from the group consisting of calcium carbonate, silacer, mica and talc, but is not limited thereto and preferably calcium carbonate (CaCO ₃ ) is preferably used. The inorganic filler may be included in the composition in an amount of 5 to 20% by weight. If the amount is less than the above range, the physical properties may be lowered and the production cost may be increased. If the amount is larger than the above range, the properties of the composition and the film may be deteriorated.

The surface active agent of the present invention can be used to coat the surface of the wheat and to mix well with waxes, polyolefins, etc., and to prevent burning of the wheat flour. The surfactant may be selected from the group consisting of stearic acid, myristic acid, palmitic acid, arachidic acid, But are not limited to, fatty acids such as linolenic acid and hardened fatty acids, and polyols such as glycerin, butylene glycol, propylene glycol, dipropylene glycol, pentylene glycol, hexylene glycol, polyethylene glycol and sorbitol. The surfactant may be included in the composition in an amount of 0.5 to 5% by weight. When the amount of the surfactant is less than 0.5% by weight, the effect of the surfactant is insignificant. When the amount exceeds 5% by weight, the film properties such as tensile strength are deteriorated.

The composition of the present invention may further comprise 10 to 30 parts by weight of a polyolefin-based resin after 100 parts by weight of the composition. The polyolefin-based resin may be the same as or different from the polyolefin-based resin contained in the composition, but it is preferable to use different ones to improve the physical properties. When the polyolefin resin is further included in the above range, the physical properties of the film can be improved.

The composition of the present invention may have a melt index (MI) of 1.5 to 10. If the melt index is lower or higher than the melting index (MI) range, the flowability of the composition may be too low or too high to be suitable for extrusion molding. In particular, when the melt index is more than 10, the composition tends to become tough and the film can not be produced.

The present invention can provide a bio-plastic pellet containing the composition.

The pellet comprising the composition is prepared by: 1) preparing a bioplastic composition by heating and mixing polyolefin resin, wheat bran, wax, inorganic filler and surfactant; and 2) extruding and cutting the bioplastic composition containing the wheat bran, The method comprising the steps of: (a) preparing a bio-plastic pellet containing wheat bran; Specifically, the wheat bran may be prepared by pre-mixing grinding, classifying and micronizing processes. The pulverizing process may be pulverized using a known pulverizing apparatus. The pulverizing process is to sort pulverized wheat blood by size. The undifferentiation process refers to collecting small-sized wheat blood that has passed through a sieve. Through the above process, a uniform fine-grain wheat bloom can be obtained.

Wherein the hardness of the pellets comprising the composition may be 94 to 98 or less. The hardness is measured by JIS-A, and when the pellets are out of the above hardness, the dispersibility is poor and the film formability is poor.

The bioplastic composition of the present invention has a uniform physical property and a high dispersibility, so that it is possible to use conventional equipment in the production of a film, and there is an effect that a hole is not generated at the time of production.

The present invention can provide a bio-plastic film containing the composition.

The film may have properties that can replace existing petroleum-derived plastic products. Specifically, the sealing strength of the film may be 0.3 to 1.4 kgf and the stamper strength may be 0.08 to 0.24 kgf. The stretching ratio of the film may be 300 to 750% in MD (mechanical direction), 250 to 900% in TD (transverse direction), tensile strength may be 0.4 to 1.5 kgf in MD (mechanical direction) Lt; / RTI > The above property range can be used for various packages such as zone packing, ton-back endothelium, and valve bag inlay.

The bio-plastic film of the present invention can be manufactured by mixing with a bio-plastic composition including wheat bran, a polyolefin resin and an additive, and melting and extruding or calendering with a Ti-die. In addition, the bioplastic film containing the polyolefin-based resin can be produced in addition to the bio-plastic pellets containing the wheat bran produced from the bio-plastic composition containing the wheat bark. Specifically, the polyolefin-based resin may be the same as or different from the polyolefin-based resin contained in the composition, but it is preferable to use different ones to improve the physical properties of the film.

The bio-plastic film of the present invention has properties similar to those of the conventional plastic-based film, so that the conventional equipment can be used, and carbon reduction is possible.

Hereinafter, the present invention will be described in more detail. The embodiments are only illustrative of the present invention, and the scope of the present invention is not limited to the scope of the embodiments.

<Examples>

1. Comparison of physical properties of bioplastic films including wheat blooms according to wheat size

Example 1: Preparation of compositions and films comprising 15 um, PDI = 1 powder of wheat flour

1) Manufacture of bioplastic composition containing wheat bran

The wheat bran was pulverized in an ACM pulverizer at 100 to 200 RPM to control the motor of the blade to automatically dry the pulverized pulverized pulp to a moisture content of 7% or less, and the pulverized pulverized powder was classified into 15 .mu.m and PDI = 1 powder (FIG. The powder in the above range is formed to have a powder of less than 30 탆 in an amount of about 90%. 50% by weight of polyethylene (LLDPE) in the form of pellets or powders, 10% by weight of calcium carbonate as an inorganic filler, 14% by weight of wax and 1% by weight of a surfactant were added to 25% The temperature was controlled so that the wheat blooms were not burned at ~ 200 ° C, and the mixture was heated and mixed to prepare a bioplastic composition containing wheat bloom. The mixture was extruded and cut to be processed into pellets.

2) Manufacture of bio-plastic film containing wheat bran

20% by weight of the prepared pellets and 80% by weight of petroleum-based PE blending (70% by weight of LLDPE and 10% by weight of LDPE) were mixed to prepare a film of Production Example 1 having a thickness of 50 탆.

COMPARATIVE EXAMPLE 1 Preparation of Composition and Film Containing Powder of Wheat with 70 탆 PDI = 3

70 탆 and PDI = 3 were produced and used in the same manner as in Example 1,

Experimental Example 1: Comparison of physical properties of bioplastic film including wheat bark according to the size of wheat flour

Tensile strength, elongation, sealing strength, and sting strength were measured to confirm the physical properties of the bio-plastic films of Example 1 and Comparative Example 1. The results are shown in Table 1.

Comparison of physical properties of bioplastic film including wheat bloom according to the size of wheat flour Item Example 1 Comparative Example 1 Wheat particles (탆, PDI)  15,1  70,3 Thickness (㎛) 50 50 Tensile strength (kgf, 15 mm) TD 1.01 0.34 MD 1.36 1.00 Elongation (%) TD 591 85 MD 522 348 Sealing strength (kgf) 0.77 0.66 Stubbing Strength (kgf) 0.14 0.12

As shown in Table 1, it was confirmed that the bio-plastic film of Example 1 had a higher tensile strength, elongation, sealing strength, and stiffness than the bio-plastic film of Comparative Example 1. [ That is, it can be confirmed that the physical properties of the bio-plastic film including wheat bran are improved when the grain-to-beow grain is 15 μm and the PDI = 1.

2. Comparison of physical properties of bio-plastic composition and film including wheat bark with wheat content

Examples 2 to 4: Preparation of a bio-plastic composition containing wheat bran at different wheat content

(LLDPE) in the form of pellets or powders was added to a powder of wheat powder having a size of 15 탆 and PDI = 1 produced by the same manufacturing method as in Example 1, 14 wt% of calcium carbonate and 1 wt% of wax were mixed with an inorganic filler To prepare a bioplastic composition containing wheat bran, and then processed into pellets. The content ratio of the polyethylene pellets in the pellet and the inorganic filler is shown in Table 2 below.

Comparative Example 2: Production of film containing no wheat bark

The composition of Comparative Example 2 was prepared in the same manner as in Examples 2 to 4 except that polyethylene alone was used without wheat blooms and inorganic fillers, and then the mixture was processed into pellets.

Composition of bioplastic composition including wheat bloom according to wheat content division Example 2 Example 3 Example 4 Wheat content 5% 15% 25% Polyethylene content 70% 60% 50% Mineral filler 15% 10% 10%

Experimental Example 2: Comparison of physical properties of bioplastic compositions including wheat bran with wheat flour content

Melt index (MI 190, 2.16 kg), hardness (JIS-A) and specific gravity of the composition or pellet of Comparative Example 2 containing no bioplastic composition or pellets and wheat bran of Examples 2 to 4, And the results are shown in Table 3.

Physical properties of bioplastic composition including wheat bran according to wheat content division Comparative Example 2 Example 2 Example 3 Example 4 MI (190 DEG C, 2.16 kg) 1.00 1.43 1.85 2.26 Hardness (JIS-A) 96.5 97.5 97.5 95 ~ 96 importance 1.213 1.044 1.035 1.046

Black spots were not generated in the preparation of the compositions of Examples 2 to 4, and the brown color was maintained. As shown in Table 3, the melt index of the compositions of Examples 2 to 4 tended to increase as the wheat flour content was increased, but all of the compositions showed appropriate values for film production even when compared with Comparative Example 2, The hardness of one pellet was also not much different from that of Comparative Example 2. [ The specific gravity was found to be smaller than that of Comparative Example 2 due to the inclusion of wheat blobs, but the appropriate values for the production of bioplastics including wheat bloom were shown.

Examples 5 to 7: Preparation of bioplastic film containing wheat bran according to wheat content

20% by weight of each of the compositions containing the wheat bran in Examples 2 to 4 and 80% by weight of petroleum-based PE blending (70% by weight of LLDPE and 10% by weight of LDPE) 7 film.

Experimental Example 3: Comparison of physical properties of bioplastic film including wheat bran with wheat flour content

The tensile strength, elongation, and sealing strength of the bio-plastic films of Examples 5 to 7 were measured, and the results are shown in Table 4.

Comparison of physical properties of bioplastic films including wheat bran according to wheat content Item Example 5 Example 6 Example 7 Wheat content in pellets 5% 15% 25% Thickness (㎛) 50 50 50 Tensile strength (kgf, 15 mm)
TD 1.60 1.08 0.65 MD 1.42 0.83 0.41 Elongation (%)
TD 552.97 452.72 318.48 MD 661.72 613.47 350.71 Sealing strength (kgf) 0.88 0.59 0.40 Stubbing Strength (kgf) 0.18 0.15 0.09

No bubbles of wheat were generated in the production of the films of Examples 5 to 7, the physical properties of the composition were uniform, and the dispersibility was high, so that the thickness variation of the film was within +/- 2%. As shown in Table 4, it was confirmed that the bio-plastic films of Examples 5 to 7 had adequate tensile strength, elongation, sealing strength, and stiffness for packaging.

3. Comparison of physical properties of bio-plastic composition and film including wheat bloom according to polyolefin resin

Examples 8 to 12: Preparation of bioplastic composition containing wheat bran according to polyolefin resin

A composition containing wheat bran was prepared by mixing polyethylene powder and catalyst in the form of pellets or powders and 1 wt.% Of calcium carbonate and wax and other additives as an inorganic filler in the wheat powder prepared in the same manner as in Example 1. The content ratios of wheat bran, polyethylene, mineral filler, wax and other additives are shown in Table 5 below.

Composition of bioplastic composition including wheat blood according to polyolefin resin division Example 8 Example 9 Example 10 Example 11 Example 12 Wheat content 5% 15% 25% 50% 30% Polyolefin resin 70% 60% 50% 35% 60% catalyst Metallocene Metallocene Metallocene Metallocene Ziggler-atta Calcium carbonate content 15% 10% 10% 10% 10% Wax 14% 14% 14% 14% 14% Other additives One% One% One% One% One%

Comparative Examples 3 and 4: Preparation of a bio-plastic composition containing no wheat bark

Comparative Example 3 (100% of polyolefin resin, metallocene catalyst) and 4 (polyolefin resin) using only polyethylene and a catalyst (metallocene catalyst and Ziegler-Natta catalyst) without wheat blooming in the same manufacturing methods as in Examples 8 to 12 100% resin, Ziegler-Natta catalyst) was prepared.

Experimental Example 3: Comparison of physical properties of bioplastic compositions including wheat bran according to polyolefin resin

In order to confirm whether the compositions of Examples 8 to 12, in which the wheat content and the polyolefin resin are different from the catalyst, are suitable for producing a bio-plastic film, the composition of Comparative Examples 3 and 4, which does not contain wheat bran, MI 190, 2.16 kg) and specific gravity were measured, and the results are shown in Table 6.

Physical properties of bioplastic composition including wheat bark according to polyolefin resin division Comparative Example 3 Example 8 Example 9 Example 10 Example 11 Comparative Example 4 Example 12 MI (190, 2.16 kg) 1.0 1.43 1.85 2.26 2.3 1.9 4.12 importance 0.921 1.044 1.035 1.046 1.05 0.922 1.088

As shown in Table 6, the melt index (MI) tends to increase as the wheat grain content increases and it is confirmed that the melt index (MI) is more uniform when the metallocene catalyst is used than when the Ziegler-Natta catalyst is used . However, all of the compositions of Examples 8 to 12 showed appropriate values for film production. Since the specific gravity of the compositions of Examples 8 to 12 was higher than those of Comparative Examples 3 and 4 because of the presence of wheat blooms, it showed appropriate values for the production of bioplastics containing wheat bran.

Examples 13 and 14: Preparation of bioplastic film containing wheat bran according to polyolefin resin

Using the metallocene catalyst instead of the composition containing the wheat blood and the Ziegler-Natta catalyst of Example 12, a composition containing wheat bran was prepared by the same method as in Example 12, and pellets were prepared from the composition. (LGH1030A) and 50% by weight of a bio-plastic film of Example 13 (Hanwha 3305) and 14 (LGSE1020A) after blending 80% by weight of petroleum-based PE blend (70% by weight of LLDPE and 10% by weight of LDPE) Respectively.

Comparative Example 5: Production of film not containing bio-plastic composition containing wheat bark

A film of Comparative Example 5 was prepared by mixing 100 wt% of petroleum-based PE (80 wt% of LLDPE and 20 wt% of LDPE) with the same preparation method as that of Examples 13 and 14 without using a bioplastic composition containing wheat bark .

Experimental Example 4: Comparison of Physical Properties of Bioplastic Film Containing Wheat Blood according to Polyolefin Resin

In order to confirm the physical properties of the bio-plastic films of Examples 13 and 14, the sealing strength was measured and the results are shown in Table 7.

Comparison of Physical Properties of Bioplastic Film with Wheat Bleached Polyolefin Resin division Sealing strength (kgf) Comparative Example 5 1.1368 Example 13 1.0082 Example 14 1.0315

As shown in Table 7, the bio-plastic films of Examples 13 and 14 had slightly lower sealing strength, sting strength, and elongation than Comparative Example 5, but showed appropriate values at the time of film processing, It is possible to confirm the effect of providing a bio plastic film which can be reduced.

4. Changes in physical properties due to the mixing of bioplastic composition and other materials including wheat blooms

Examples 15 to 17: Preparation of bioplastic film containing wheat bran further mixed with other materials

20 parts by weight of LLDPE was further mixed with 100 parts by weight of the composition containing the wheat bran in Example 4 to prepare a bioplastic composition, and pellets were prepared from the composition. 20% by weight of the pellets and 80% by weight of petroleum-based PE blending (70% by weight of LLDPE and 10% by weight of LDPE) were mixed to prepare a bioplastic film of Example 15 having a thickness of 50 탆. 20 and 20 parts by weight of LDPE and 20 parts by weight of M-PE were used instead of LLDPE to prepare bioplastic films of Examples 16 and 17, respectively.

Experimental Example 5: Comparison of physical properties of bioplastic film including wheat bran mixed with other materials

Sealing strength, sting strength and elongation were measured to confirm the physical properties of the bio-plastic films of Examples 15 to 17, and the results are shown in Table 8.

Comparison of physical properties of bioplastic films including wheat bran mixed with other materials Item Example 15 Example 16 Example 17 Furtherance 25% wheat flour 100 parts by weight + LLDPE 20 parts by weight 25% wheat flour 100 parts by weight + LDPE 20 parts by weight 25% wheat flour 100 parts by weight + M-PE 20 parts by weight Thickness (㎛) 50 50 50 Tensile strength (kgf, 15 mm) TD 0.89 0.88 0.80 MD 0.64 0.53 0.53 Elongation (%) TD 431.29 266.22 341.79 MD 416.04 532.47 324.47 Sealing strength (kgf) 0.57 0.64 0.58 Stubbing Strength (kgf) 0.14 0.11 0.12

As shown in Table 8, it was confirmed that tensile strength, sealing strength, puncture strength and elongation percentage of the bio-plastic films of Examples 15 to 17 were higher than those of Example 7. When other materials were mixed with the composition, It is possible to change it.

Claims (16)

1. A bio-plastic composition comprising a polyolefin resin, a wheat bran, a wax, an inorganic filler and a surfactant,
Wherein the wheat grain size is 10 to 25 占 퐉, the wheat grain size uniformity (PDI) is 2 or less,
The wax is contained in the composition in an amount of 14 to 20% by weight,
And a melt index (MI) of 1.43 to 10. The method according to claim 1,
Wherein the polyolefin-based resin further comprises at least one selected from the group consisting of polyethylene (PE), polypropylene (PP), polybutylene, and polymethylpentene. The method according to claim 1,
Wherein the polyolefin resin is contained in the composition in an amount of 40 to 70 wt%. The method according to claim 1,
Wherein the polyolefin-based resin comprises polyethylene produced under a metallocene catalyst. The method according to claim 1,
Wherein the wheat bran has a moisture content of 1 to 10% by weight or less. The method according to claim 1,
Wherein the wheat bran is contained in an amount of 10 to 30% by weight. The method according to claim 1,
Wherein the wax comprises at least one selected from paraffin wax, liquid paraffin wax, beeswax, mold wax, candelilla wax, polyethylene wax, and polypropylene wax. The method according to claim 1,
Wherein the inorganic filler is at least one selected from the group consisting of calcium carbonate, silacar, mica and talc,
Wherein the inorganic filler is contained in an amount of 5 to 20 wt% in the composition. The method according to claim 1,
The surfactant may be selected from the group consisting of fatty acids such as stearic acid, myristic acid, palmitic acid, arachidic acid, oleic acid, linolenic acid and hardened fatty acid, glycerin, butylene glycol, propylene glycol, dipropylene glycol, pentylene glycol, hexylene glycol, polyethylene Glycol, and sorbitol, and more preferably,
Wherein the surfactant is contained in an amount of 0.5 to 5% by weight. The method according to claim 1,
Wherein the composition further comprises 10 to 30 parts by weight of a polyolefin resin after 100 parts by weight of the composition. A bio-plastic pellet comprising the composition of claim 1. A bio-plastic film comprising the composition of claim 1. 13. The method of claim 12,
Wherein the film further comprises a polyolefin-based resin. A method for producing a pellet containing a bioplastic composition including wheat bark,
1) preparing a bio-plastic composition containing wheat bran by heating and mixing polyolefin resin, wheat bran, wax, inorganic filler and surfactant; And
2) molding into pellets;
A method for producing a bio-plastic pellet comprising:
Wherein the wheat grain size is 10 to 25 占 퐉, the wheat grain size uniformity (PDI) is 2 or less,
The wax is contained in the composition in an amount of 14 to 20% by weight,
Wherein the bioplastic composition has a melt index (MI) of 1.43 to 10. 15. The method of claim 14,
Wherein the wheat bran is subjected to pulverization, classifying and micronization before, during, and after heating and mixing. 15. The method of claim 14,
The method for producing a bio-plastic film according to claim 1, wherein the bio-plastic pellet comprises a polyolefin-based resin.

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