KR101956011B1 - A molded product having micro powder of cellulose - Google Patents

Abstract

A molded product according to the present invention, by mixing a cellulose micropowder having paper as a raw material into a thermoplastic resin composition at a predetermined ratio or more, can increase the addition amount of cellulose micropowder and reduce the use of environmentally harmful substances. In addition, compared to resin molded products comprising a biodegradable resin and paper, the molded product can satisfy mechanical properties and is able to perform injection molding without any restrictions, thereby being able to mass produce and be applied to various products. The molded product according to the present invention can be widely used for products such as flooring materials, furniture, frames of electronic products, internal components of automobiles, a bath cover, toilet wall materials, a kitchen member, beverage wares, various dishes except for beverage, containers, packages, and hollow bodies.

Description

[0001] The present invention relates to a molded product containing micro powder of cellulose,

More particularly, the present invention relates to a resin molded article which can be injection-molded without any restriction by increasing the addition amount of cellulose fine powder by mixing a thermoplastic resin composition with a cellulose fine powder having paper raw materials as raw materials, .

With the development of industry since industrialization, synthetic resins such as paper of various kinds and uses have been produced and supplied. As a result, the amount of pulp paper residue generated as a by-product in the process of producing newsprint paper, wallpaper, plain paper, various paper pulp and paper produced after use has also increased sharply, resulting in problems of disposal of pulp pulp and cost problems and environmental problems Is emerging.

Therefore, studies on an economical and environmentally friendly treatment method for recovering and using pulp pulp have been actively conducted, and researches for producing a synthetic resin or resin composite composition which is environmentally friendly, cost saving and improved in performance by using pulp pulp Is continuing.

However, since the resin composite composition using the pulp pulp decreases the fluidity as the pulp pulp ratio is increased, the processability is deteriorated, and in particular, the pulp pulp itself has poor physical properties, so that the properties, There is a problem that it is reduced compared to a general resin composite composition.

Particularly, pulp pulp is difficult to mix with synthetic resin due to pulverization between pulps. Korean Patent Laid-Open No. 10-2006-0110500 discloses a method in which pulp pulp and synthetic resin are separately pulverized separately, and synthetic pulp and additives are mixed and heated to the pulverized pulp pulp and extruded to suppress generation of static electricity between the pulp pulp Is known.

However, despite these numerous studies, it is true that the resin composite composition recycled from waste pulp is not as good as its properties and properties than the resin composite composition without pulp pulp.

Particularly, the reason why the physical properties and properties of the resin composite composition using pulp pulp are greatly reduced is due to the hydrophilicity of cellulose, which is the main component of the pulp. Since the hydrophilicity of the composition itself is high, the moisture content of the composition is largely changed according to the humidity in the atmosphere, resulting in a significant deterioration of the mechanical properties of the molded article.

Korean Patent Publication No. 10-2006-0110500 (October 25, 2006)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in an effort to solve the above-mentioned problems, and an object of the present invention is to provide a thermoplastic resin composition which is capable of increasing the addition amount of cellulose fine powder and reducing the use of environmentally harmful substances by mixing cellulose fine powder, , And to provide a resin molded article which can satisfy the mechanical properties and can be injection-molded without any restrictions.

The present invention relates to a molded article containing a cellulose fine powder.

One aspect of the present invention relates to a cellulose micropowder having an average particle size of 10 to 50 占 퐉, an apparent specific gravity of 0.25 to 0.35 kg / l, and a water content of 2 to 6% by weight; One or more thermoplastic resins selected from the group consisting of polyethylene, polypropylene, polyester, polylactic acid, thermoplastic elastomer, polystyrene, and acetylonitrile-butadiene-styrene copolymer resin; And an additive; and a molded article containing the cellulose fine powder.

In the present invention, the molded article is characterized by containing 40 to 60% by weight of cellulose fine powder, 30 to 50% by weight of a thermoplastic resin and 5 to 10% by weight of an additive, wherein the thermoplastic resin is at least one selected from the group consisting of polyethylene, polypropylene, And 10 to 40 parts by weight of a thermoplastic elastomer relative to 100 parts by weight of any one or more general polymers selected from polyolefins, polystyrene, and polystyrene.

The thermoplastic elastomer may be at least one selected from the group consisting of styrene-butadiene, styrene-isoprene, styrene-butadiene-styrene, styrene-isoprene-styrene, styrene- (ethylene-butylene), styrene- (ethylene- (Styrene), styrene (ethylene-propylene) -styrene, styrene- (ethylene-butylene) -styrene- (ethylene-butylene) - (ethylene-propylene) -styrene, wherein the additive is selected from the group consisting of an internal lubricant, a bulking agent, an inorganic particle, a pigment, a plasticizer, a heat stabilizer, an antioxidant, a light stabilizer, scavengers, dyes, fragrances, optical brighteners and flame retardants.

The molded product had a mass flow rate of 0.2 to 1.5 g / 10 min measured at 230 캜 / 2.16 kg, a water content of 0.5 wt% or less, and a specific gravity of 1.125 to 1.160 g / cm 3 as measured by ISO 1133 The cellulose fine powder is characterized in that one or a plurality of papers selected from printing paper, writing paper, printed paper, information paper, wrapping paper, sanitary papermaking paper, and magazine paper are made into fine powders as raw materials.

The molded article according to the present invention can increase the addition amount of cellulose fine powder and reduce the use of environmentally harmful substances by mixing the cellulose fine powder having the paper raw material as raw material in the thermoplastic resin composition at a predetermined ratio or more, It is possible to satisfy the mechanical properties as well as injection molding without any restrictions, and it is advantageous in mass production and application to various products.

The molded article according to the present invention can be used for various purposes such as flooring, furniture, an electronic product frame, an automobile interior part, a bathtub cover, a toilet wall, a kitchen member, Can be widely used.

Hereinafter, the molded article containing the cellulose fine powder according to the present invention will be described in more detail through specific examples or examples. It should be understood, however, that the invention is not limited thereto and that various changes and modifications may be made without departing from the spirit and scope of the invention.

Unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Also, the singular forms as used in the specification and the appended claims are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The molded article containing the cellulosic powder according to the present invention,

A cellulose fine powder having an average particle size of 10 to 50 占 퐉, an apparent specific gravity of 0.25 to 0.35 kg / l, and a water content of 2 to 6% by weight; One or more thermoplastic resins selected from the group consisting of polyethylene, polypropylene, polyester, polylactic acid, thermoplastic elastomer, polystyrene, and acetylonitrile-butadiene-styrene copolymer resin; And additives.

In the present invention, the cellulose fine powder is obtained by pulverizing various kinds of materials containing cellulose as a main component, and specifically, pulp, paper or paper fiber made of a large number of tree species can be used. Examples of these are broadly classified into softwoods and hardwoods, and typical softwood species include a variety of spruce (e.g., Sitka Spruce), fir (Douglas < (R) > (Douglas fir), various hemlock (American hemlock), tamarack, larch, various pines (Southern pine, White pine, , And Caribbean pine), cypress and redwood, or a mixture thereof. Examples of typical gypsum species are ash, aspen, cottonwood, basswood, birch, beech, chestnut, rubber tree gum, elm, eucalyptus, maple oak, poplar, and sycamore, or a mixture thereof.

In the present invention, it is more preferable to use paper dust generated as the cellulose fine powder as well as pulp, paper, and the like. This is caused largely when the roller milling operation or the dryer blading operation is performed in the papermaking process or when the workplace blowing cleaning is performed. By removing the pulp in the chip state during the papermaking process, the impurities are effectively removed, It is easy to control the moisture content of the cellulose fine powder.

The grip may be at least one of virgin paper and paper powders produced during the production of old paper, or a mixture thereof. You can use newspapers or magazine notices, printing notices, packing notices, corrugated cardboard notices, and OA notices. As virgin paper, it is also possible to use paper or paper that is produced when it is made. As the paper powder, a powder of a cellulose-based material obtained by pulverizing pulp with pulverizing process using at least one of a hardwood pulp and a softwood pulp may be used have. The pulp may be a mechanical pulp, a chemical mechanical pulp, a semi-chemical pulp, or a chemical pulp. It is preferable to use chlorine and those which do not contain a fluorescent whitening agent as the paper or pulp. If the species or pulp contains chlorine or fluorescent bleaching agent, remove chlorine and dechlorinating bleach to remove chlorine and fluorescent bleaching agent.

In the present invention, the cellulose fine powder can be prepared by pulverizing and drying the thus-obtained phage. Specifically, the grinding step is a step of grinding fine powder having a uniform particle diameter through a preliminary grinding step and a fine grinding step. First, the grinding is processed into a paper powder having a size of several tens of micrometers to a few hundreds of micrometers. The jaw crusher, the gyratory crusher, the cone crusher, the hammer crusher, and the roll crusher can be used as the coarse grinder.

Next, the pulverized phage can be finely pulverized through the coarse grinder. At this time, the mean particle size of the fine pulverized phage is preferably 50 占 퐉 or less, more preferably 10 to 50 占 퐉. When the average particle size of the phage is less than 10 탆, it is difficult to control the water content, and the particles are aggregated by moisture in the air and are not uniformly dispersed in the thermoplastic resin to be described later. They are present in the form of fine particles in the thermoplastic resin and the mechanical properties of the sheet may be greatly deteriorated.

As the coarse grinder, a ball mill, a medium stirring mill, and a roller mill may be used. As the ball mill, a rolling ball mill, a vibrating ball mill, a star ball mill, and a tower ball mill can be used. As the medium agitating mill, an agitating mill, an annular mill may be used. Centrifugal roller mill or hydraulic roller mill can be used as the roller mill.

The pulverized phage can be dried to adjust the water content to a certain range, thereby completing the cellulose fine powder.

The drying method includes both a hot and cold drying method and a rotary separation type dewatering method in which the material is washed and dried in a container after washing, and the phage dried or rotary separation type phage is mixed with a phosphorus pentoside white powder It is also possible to put it in a certain amount of container and place it in a well-ventilated place at regular intervals to dry it so that moisture is absorbed.

In the present invention, it is preferable that the apparent specific gravity and the water content of the cellulose fine powder are adjusted to a certain range through the above-described process. Specifically, the cellulose fine powder preferably has an apparent bulk density of 0.25 to 0.35 kg / l and a moisture content of 2 to 6% by weight. When the apparent specific gravity of the cellulose fine powder is less than the above range, back pressure may occur due to the pressure of steam generated in the raw material mixing process. If the apparent specific gravity of the cellulose fine powder is less than the above range, the frequency of aggregation of the cellulose fine powder increases, The physical properties of the final product may be deteriorated or the error range of the physical properties may be widened. If the moisture content of the cellulose fine powder is less than the above range, the generation of static electricity may increase and the productivity of the secondary product may be greatly reduced. If the water content is above the range, the mechanical properties of the product may be greatly reduced.

The cellulose fine powder may be contained in an amount of 40 to 60% by weight based on 100% by weight of the whole composition. When the content of the cellulose fine powder is less than 40% by weight, it is difficult to achieve the object of phage recycling. When the cellulose fine powder is added in an amount exceeding 60% by weight, the mechanical properties of the secondary molded product may be greatly reduced during the production of the secondary molded product using the pellets.

In the present invention, the thermoplastic resin is selected from polyethylene, polypropylene, polyester, polylactic acid, thermoplastic elastomer, polystyrene, and acetylonitrile-butadiene-styrene copolymer resin to mix with the cellulose fine powder to maintain the shape of the pellets. Or the like.

The thermoplastic resin is more preferably a mixture of a polypropylene and a thermoplastic elastomer. Mixing of such compositions can exhibit and maintain excellent flexibility and exhibit improved mechanical properties.

The polypropylene resin may be a polypropylene polymer or a copolymer of polypropylene and an aliphatic alpha-olefin or aromatic olefin. Wherein the aliphatic alpha-olefins and aromatic olefins may have from 2 to 20 carbon atoms, preferably from 2 to 8 carbon atoms.

For example, the polypropylene resin may be a polypropylene polymer or a copolymer of propylene and at least one olefin selected from the group consisting of ethylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene, As another example, at least one selected from the group consisting of polypropylene polymer, polypropylene copolymer, propylene-alpha-olefin copolymer, propylene-ethylene copolymer, propylene-butene copolymer and propylene-ethylene-butene copolymer is used . Where the copolymer may be a random or block copolymer.

The polypropylene resin preferably satisfies rigidity and impact resistance, and at the same time, satisfies a specific range of physical properties in order to satisfy moldability such as flowability. Specifically, the melt index measured by ASTM D1238 is 0.5 to 10 g / 10 min, the density measured by ASTM D792 is 0.8 to 1.0 g / cm 3, the heat distortion temperature (HDT) measured by ASTM D648 is 100 to 100 g / 125 캜. In the above range, the above-described mechanical properties such as rigidity and impact resistance, moldability such as flowability and flexibility can be satisfied, which is preferable.

The thermoplastic elastomer is dispersed in the polypropylene resin to improve flexibility, crystallinity and moldability. Part of the styrene elastomer can be produced by dynamic crosslinking.

Examples of the thermoplastic elastomer include styrene-butadiene, styrene-isoprene, styrene-butadiene-styrene, styrene-isoprene-styrene, styrene- (ethylene- Styrene- (ethylene-propylene) -styrene- (ethylene-propylene) -styrene, styrene- (ethylene-butylene) -styrene- (ethylene-butylene) -Ethylene- (ethylene-propylene) -styrene, etc. These may be used alone or in combination of two or more.

The thermoplastic resin may further comprise at least one stabilizer, if necessary. The stabilizer reduces the surface tackiness of the polypropylene resin or the thermoplastic elastomer, so that it is easy to maintain the shape of the pellet and the workability can be improved.

In the present invention, the thermoplastic resin preferably comprises 10 to 40 parts by weight of a thermoplastic elastomer in 100 parts by weight of one or more general polymers selected from polyethylene, polypropylene, polyester, polylactic acid and polystyrene. When the thermoplastic elastomer is added in an amount of less than 10 parts by weight, the flexibility and elasticity of the thermoplastic resin may be lowered and the moldability may be deteriorated. When the thermoplastic elastomer is added in an amount exceeding 40 parts by weight

The stabilizer may include a polyethylene wax. The polyethylene wax may include a low molecular weight polyethylene wax obtained by polymerizing or copolymerizing ethylene and a low molecular weight polyethylene wax obtained by thermally decomposing the polymer or copolymer.

Specifically, the weight average molecular weight of the polyethylene wax may be 10,000 or less, more preferably 2,000 to 9,000, and the melting point may be 135 to 150 ° C. The polyethylene wax may have a density measured according to JIS K7112 standard of 800 kg / m 3 to 1,000 kg / m 3.

The stabilizer may be added in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the thermoplastic resin. If it is added in an amount of less than 0.1 part by weight, the effect of improving the physical properties upon addition of the stabilizer is insufficient. If the addition amount exceeds 5 parts by weight, the viscosity may decrease and the moldability may be lowered.

The thermoplastic resin may be added in an amount of 30 to 50% by weight based on 100% by weight of the total composition. When the amount of the cellulose fine powder is less than 30% by weight, the addition of the cellulose fine powder may be excessive and the mechanical properties of the molded product may be deteriorated. When the amount is more than 50% by weight, the amount of the cellulose fine powder may be decreased.

In the present invention, the additive is added in order to complement the mechanical-chemical properties of the thermoplastic resin and the fine cellulosic powder described above. The additive is selected from the group consisting of internal lubricants, antistatic agents, inorganic particles, pigments, plasticizers, heat stabilizers, antioxidants, , A sans scavenger, a dye, a flavor, an optical brightener, and a flame retardant.

In the present invention, the internal lubricant is added in order to increase the fluidity of the composition to facilitate processing and is selected from the group consisting of a metal stearate lubricant, an amide lubricant, a paraffin lubricant, and an ester lubricant . Examples of commercially available lubricants include Hi-Lube (Shinwon Chemical), Mg-St (Songwon), Ca-St (Songwon), Zn-St (Songwon), and AX-71 (ADEKA).

In the present invention, the anticaking agent is for suppressing the eye phenomenon occurring on the mold die. Examples of commercially available anticaking agents include L-1000 (Mitsubishi).

In the present invention, the inorganic particles are used in order to increase the heat resistance, extinction resistance, impact resistance, dimensional stability, and the like of the composition and enable complicated injection molding. The inorganic particles are used in the form of a master batch Can be added.

The polymeric resin contained in the inorganic particles may be used without limitation as long as it has physical properties similar to those of the thermoplastic resin. Specifically, low density polyethylene (LDPE), medium density polyethylene, high density polyethylene or linear low density polyethylene (LLDPE) can be used.

The inorganic particles to be mixed with the polymer resin are not limited to the types as long as they are conventionally added in the art for the above purpose, and examples thereof include titanium dioxide (TiO ₂ ), calcium carbonate (CaCO ₃ ), carbon black and the like .

When the inorganic particles are added in the form of a master batch, it is preferable to add 30 to 80 parts by weight of inorganic particles to 100 parts by weight of the polymer resin, but the present invention is not limited thereto.

In the present invention, the plasticizer is used for improving the moldability at high temperature by increasing the thermoplasticity of the composition. The plasticizer is selected from the group consisting of phthalate plasticizer, aliphate plasticizer, trimellitate plasticizer, a polyester plasticizer, an epoxy plasticizer, a phosphate plasticizer and a glycol plasticizer may be used.

In the present invention, the antioxidant is used for preventing oxidation of the composition, and a phosphorus-based antioxidant, a phenol-based antioxidant or the like may be used. Examples of the phosphorus antioxidant include tris (2,4-di-t-butylphenyl) phosphite or bis (4,2,4-di-tert-butylphenyl) pentaerythritol diphosphite. The phenolic antioxidant may be thiodiethylene bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate or octadecyl-3- (3,5- Hydroxyphenyl) propionate, and the like. These may be used alone or in combination of two or more.

In the present invention, the heat stabilizer and the light stabilizer are used for suppressing pyrolysis of the compositions. One or more of the heat stabilizers and the light stabilizers may be added in the group consisting of a horseshoe light stabilizer, a benzotriazole light absorber, and a benzophenone light absorber.

In the present invention, the optical brightener is used for increasing the transparency of the secondary molded product and suppressing the development of a blue color tone when the secondary molded product is produced using the composition. Examples of the optical brightener include bis- (benzoxazolyl) Based brightener, a bis- (benzoxazolyl) naphthalene-based brightener, a bis- (benzoxazolyl) thiophene brightener, a coumarin brightener and a pyrazoline brightener, and the like.

In the present invention, the flame retardant is one or more selected from melamine orthophosphate, melamine pyrophosphate, melamine polyphosphate, ammonium polyphosphate, and ammonium polyphosphate to improve the flame retardancy of the composition.

The additive according to the present invention may further contain adjuvants such as a scavenger, a pigment, a dye and a fragrance in addition to the above-mentioned components, and the amount of the additive can be freely adjusted within a range that does not impair the object of the present invention .

In the present invention, the production method of the molded body is not limited. For example, the composition is weighed to a predetermined ratio, and homogeneously mixed using a Henschel mixer or the like. The mixture is put into a kneader equipped with a hopper, a cylinder, and the like, and the mixture is homogenized at a temperature of 100 to 200 ° C. Then, it is preferable to feed it continuously to the feeder of the extruder and pelletize it.

In the present invention, it is preferable that the molded article has a melt flow index of 0.2 to 1.5 g / 10 min measured at a load of 230 DEG C and a load of 2.16 kg according to ASTM-D1238. When the flow index of the molded product is less than 0.2, a sheet having a thickness of 0.4 mm or less can not be produced. When the flow index is more than 1.5, a sheet having a thickness of 0.3 mm can be produced.

The molded product preferably has a water content of 0.5 wt% or less, more preferably 0.001 to 0.5 wt%, and a specific gravity of 1.125 to 1.160 g / cm 3 as measured by ISO 1133. The water content of the molded product is preferably as low as possible, so it is preferable to seal it with the external environment so as to maintain a low water content as much as possible. If the water content exceeds 0.5% by weight, property deterioration and perforation may occur during sheet production.

Also, considering the specific gravity of paper powder (1.13 g / ㎤), the specific gravity can not be lowered below 1.125 considering that the total raw material ratio contains more than 50% of paper powder. If the specific gravity is less than 1.125, the content of the paper powder may be lowered. If the specific gravity is more than 1.160, the paper powder content may be increased and the physical properties may be lowered. Drawdown may occur in the vacuum forming process, which is a post-process of the sheet production, and it may be difficult to produce the final product.

The secondary molded article using the molded article containing the fine cellulosic powder of the present invention is obtained by molding the molded article of the present invention into a pellet by the same molding method as the conventionally known plastic resin molding method. Examples of secondary molded articles formed by the molded article of the present invention include films, cups, dishes, food trays, bowls, combs, wound bobbins, hangers, calendar holders, and toothbrushes.

Hereinafter, the molded article containing the cellulose fine powder according to the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the following examples and comparative examples are merely examples for explaining the present invention in more detail, and the present invention is not limited by the following examples and comparative examples.

The physical properties of the specimens prepared through the following examples and comparative examples were measured as follows.

(Melt flow rate, specific gravity)

Was measured at 230 占 폚 / 2.16 kg based on ISO 1133 (melt mass flow and melt volume flow of thermoplastic).

(Water content)

The water content was measured by adding water (5 g) to a water content meter and heating at 100 ° C for 10 minutes.

(Apparent density)

Measured according to KS M ISO 60: 2002 (Measurement of apparent density).

(Mechanical properties-tensile strength, tensile elastic modulus, elongation)

And measured according to JIS K7113 (tensile test method).

(Flexural strength, flexural modulus)

And measured according to JIS K7203 (method for measuring flexural properties of hard plastic).

(IZOD impact strength)

ASTM D256 (Izod impact test on composite material).

(Secondary molded article properties)

(1) Mechanical properties - Tensile yield strength, tensile fracture strength, tensile fracture elongation, elasticity ratio: Measured according to JIS K6251 (tensile stress-strain test of thermoplastic material).

Specific gravity: The specific gravity was measured according to ASTM D792 (specific gravity and density test of the molded product).

(Example 1)

First, glutathione (MAPKA, ERI) was prepared as a cellulose fine powder. (J-640, manufactured by Hyosung Co., Ltd.) as a thermoplastic resin and an internal lubricant (Ca-St, identity as an additive) as an additive. (Polyethylene resin, 70% by weight of TiO ₂ , polyethylene resin, PNP company) were mixed as inorganic particles, and the composition ratio thereof was 50% by weight of cellulose fine powder (manufactured by Mitsubishi K.K.) 45% by weight of a thermoplastic resin, and 5% by weight of an additive mixture. This was put in an extruder and pelletized to obtain a molded article containing a cellulose fine powder.

(Example 2)

In Example 1, an elastomer resin in which polypropylene and a thermoplastic elastomer (Versify 3401, manufactured by Dow Chemical Co., Ltd.) were mixed with a thermoplastic resin was used in the production of a molded article. At this time, the mixing ratio was such that 30 parts by weight of the thermoplastic resin was added to 100 parts by weight of the polypropylene, and the amount of the total thermoplastic resin added was the same as in Example 1. A molded body was produced with the same composition and method except for the above contents.

(Example 3)

The molded article was prepared in the same manner as in Example 1 except for containing 55% by weight of cellulose fine powder and 38% by weight of thermoplastic resin.

(Comparative Example 1)

The molded article was prepared in the same manner as in Example 3 except that the apparent specific gravity of the cellulose fine powder was adjusted to 0.22 kg / l.

(Comparative Example 2)

The molded article was prepared in the same manner as in Example 3 except that the apparent specific gravity of the cellulose fine powder was adjusted to 0.37 kg / l.

(Comparative Example 3)

The molded article was prepared in the same manner as in Example 3 except that the water content of the cellulose fine powder was adjusted to 1.5 wt%.

(Comparative Example 4)

A shaped body was prepared in the same manner as in Example 3 except that the water content of the cellulose fine powder was adjusted to 6.5 wt%.

(Example 4)

A sheet was produced using the molded body produced in Example 3 above. The molded product had a melt mass flow of 1.0 g / 10 min, a water content of 0.3 wt% measured at 230 ° C / 2.16 kg, and a specific gravity of 1.35 g / cm 3 measured according to ISO 1133. The sheet had a thickness of 0.5 mm After the laminate was made into a sheet shape, a polypropylene (HB240T, Hyosung Corporation) film molded to 0.25 mm in thickness on both sides was laminated. The laminated sheet was biaxially stretched by adjusting the elongation to 40%.

(Example 5)

A sheet was prepared in the same manner as in Example 4, except that the water content of the composition was adjusted to 0.05 wt% in the production of a molded article.

(Comparative Example 5)

The sheet was prepared in the same manner as in Example 4 except that the melt flow rate of the composition (HI828, Hanwha total) was changed to 1.55 by replacing polypropylene in the production of a molded article.

(Comparative Example 6)

A sheet was prepared in the same manner as in Example 4, except that the water content of the composition was adjusted to 0.55 during the production of the molded article.

(Comparative Example 7)

A sheet was prepared in the same manner as in Example 4, except that the specific gravity of the composition was adjusted to 1.15 during the production of a molded article.

(Comparative Example 8)

A sheet was prepared in the same manner as in Example 4, except that the specific gravity of the composition was adjusted to 1.75 during the production of the molded article.

[Table 1]

[Table 2]

(In Table 2, MD is the machine direction and TD is the transverse direction.)

As shown in Table 1, the pellets produced according to the present invention satisfy the mechanical properties even though they contain cellulose fine powder. Particularly, in Example 3, which changed the content of the cellulose fine powder and the thermoplastic resin, the flexural modulus was somewhat lower than that of Example 1, but the impact strength and elongation were much higher.

On the other hand, in Comparative Example 1 in which the apparent specific gravity was decreased, the cellulose fine powder was aggregated with each other due to an increase in the average particle size of the cellulose fine powder, and the elongation was greatly decreased. In Comparative Example 2 in which the apparent specific gravity was increased, Due to the back pressure, it was not extruded properly.

Also, in Comparative Examples 3 and 4 in which the moisture content of the cellulose fine powder exceeded the standard value, all of the flexural modulus and the impact strength were excessively decreased, and it was found that it was difficult to secure the mechanical properties even if it was made into a secondary product.

It can be seen that when the sheet is produced using the pellets produced according to the present invention, desired physical properties are secured in terms of tensile strength, elongation, and elasticity. In particular, in Example 5 in which the water content of the composition was adjusted to 0.05 wt%, it was found that the cause of defects occurring during extrusion of the sheet hardly occurred, such as warpage and lifting of the sheet, and thus it has the most excellent mechanical properties.

On the other hand, in Comparative Example 5 in which the melt mass flow was controlled to 1.55, the stretchability was not so difficult to use due to the increase in crystallinity of the sheet. In Comparative Example 6 in which the water content of the composition was out of the range, But the elongation rate was remarkably decreased. Comparative Examples 7 and 8 in which the specific gravity of the composition was adjusted to a specific range also exhibited physical properties such that the increase or decrease in crystallinity affected the mechanical properties of the entire sheet and made it too hard or too soft to be used as a final product.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined by the following claims. It will be understood that the invention may be modified and varied without departing from the scope of the invention.

Claims (7)

A cellulose fine powder having an average particle size of 10 to 50 占 퐉, an apparent specific gravity of 0.25 to 0.35 kg / l, and a water content of 2 to 6% by weight;
Thermoplastic resin; And
additive;
/ RTI >
Wherein the thermoplastic resin comprises 10 to 40 parts by weight of a thermoplastic elastomer relative to 100 parts by weight of any one or more general polymers selected from polyethylene, polypropylene, polyester, polylactic acid and polystyrene. .
The method according to claim 1,
Wherein the molded article comprises 40 to 60% by weight of a cellulose fine powder, 30 to 50% by weight of a thermoplastic resin and 5 to 10% by weight of an additive.
delete The method according to claim 1,
The thermoplastic elastomer may be selected from the group consisting of styrene-butadiene, styrene-isoprene, styrene-butadiene-styrene, styrene-isoprene-styrene, styrene- (ethylene- Styrene- (ethylene-propylene) -styrene- (ethylene-propylene) -styrene, styrene- (ethylene-butylene) -styrene- (ethylene- (Ethylene-propylene) -styrene. The molded article containing the cellulose fine powder according to claim 1 or 2,
The method according to claim 1,
The additive is any one or more selected from an internal lubricant, an antistatic agent, an inorganic particle, a pigment, a plasticizer, a heat stabilizer, an antioxidant, a light stabilizer, a sans cabin, a dye, a flavor, A molded article containing the fine cellulose powder.
The method according to claim 1,
The molded article has a mass flow rate of 0.2 to 1.5 g / 10 min measured at 230 캜 / 2.16 kg, a water content of 0.5 wt% or less, and a specific gravity of 1.125 to 1.160 g / cm 3 as measured by ISO 1133 By mass of the cellulose fine powder.
The method according to claim 1,
Wherein the cellulose fine powder is one or a plurality of papers selected from a printing paper, a writing paper, a printing paper, an information paper, a wrapping paper, a sanitary papermaking paper, and a magazine paper as fine powders as a raw material.