KR100609516B1 - Manufacturing Method of Corn-Stalk Plastic Material Compounded with Corn Stalk and Polymer Resins - Google Patents

Abstract

The present invention relates to a method of manufacturing cornstalk plastics using cornstalks, by mixing polymer resins and functional additives in cornstalk crushed products at an appropriate ratio, thereby improving the water resistance and physical strength characteristics significantly, thereby replacing the use of conventional plastics or wood. The present invention relates to a method of manufacturing environmentally friendly corncob plastic. In order to achieve the above object, the present invention provides a method for producing cornstalk plastic by mixing an appropriate amount of cellulose-containing corn flakes and thermoplastic and thermosetting resin, wherein the average size of the corn crushed powder is 0.1 to 10 mm in width and length. 30 to 80% by weight of crushed cornstalk to 0.1 to 10mm and 20 to 70% by weight of synthetic resin and 0.1 to 5% by weight of additives, followed by melt mixing in a reactor at 60 to 250 ° C, followed by injection or extrusion and It provides an environmentally friendly cornstalk plastic manufacturing method characterized in that the pressing and molding.

Cornwashed plastic, eco-friendly plastic, plastic and wood substitute

Description

Manufacturing method of Corn-Stalk Plastic Material Compounded with Corn Stalk and Polymer Resins}

The present invention relates to a method of manufacturing plastic using a corn cob, which comprises a corn cob crushed product as a main component, and various additives such as synthetic resin and a fluidizing agent are mixed in a proper ratio, and then heated, injected and pressed to produce a molded article. It aims at the manufacturing method of the corn cob used plastic.

In recent years, as the rapid development of the entire industry has led to an exponential increase in the development of materials for various uses, to meet this demand, pulp production technology using corn stoves, which have been abandoned in farms or used for feed, has been developed. This was developed. However, there is no technology to manufacture cornstalk plastic as a new material by using cornstalks as a by-product of this process as well as cornstalks that are cultivated in general farms, cut to a certain size, mixed with resins, and used as new materials. .

Corn cultivation covers an area of 140 million hectares worldwide, including 2800 million hectares in the US and 2600 million hectares in China. The cornstalks produced here are very vast and the reality is that this enormous natural resource is left undetected for this purpose. The price of corn as a raw material for corn is inexpensive compared to any material in the world. Roughly calculated, the cornstalk material is about 30,000 to 40,000 won per tonne crushed.

In view of this, it is considered that the use of corn cob as an environmentally friendly material obtained as a by-product of the production of corn eggs in farms around the world is very interesting in view of the infinity of the material, and its effective treatment method is Has been studied.

As described above, the cornstalk is collected and pulverized finely, and then mixed with general synthetic resins or waste plastics such as polyethylene, polyvinyl chloride, polypropylene or polyethylene terephthalate, and then mixed with appropriate amounts of various additives and fillers. It can be mixed and molded into various types of building materials, various boards, threads, blocks, various containers, plastic structures, and the like. In the case of various molded articles manufactured, increasing the amount of corn grind in order to increase the utilization of crushed corn grits, the strength of impact strength, tensile strength, compressive strength, etc. is slightly lowered and the water resistance is poor. As it can be used as building interior materials, noise absorbing materials, electromagnetic wave shielding materials, insulation materials, interior materials, etc., it is possible to manufacture materials for various uses by adding a polymer resin compound while the amount of corn is limited to 30 to 80%. There is also an advantage that can be significantly lowered.

The present invention relates to a method of manufacturing cornstalk plastics using cornstalks, by mixing polymer resins and functional additives in cornstalk crushed products at an appropriate ratio, thereby improving the water resistance and physical strength characteristics significantly, thereby replacing the use of conventional plastics or wood. The present invention relates to a method of manufacturing environmentally friendly corncob plastic. In order to achieve the above object, the present invention provides a method for producing cornstalk plastic by mixing an appropriate amount of cellulose-containing corn flakes and thermoplastic and thermosetting resin, wherein the average size of the corn crushed powder is 0.1 to 10 mm in width and length. 30 to 80% by weight of crushed cornstalk to 0.1 to 10mm and 20 to 70% by weight of synthetic resin and 0.1 to 5% by weight of additives, followed by melt mixing in a reactor at 60 to 250 ° C, followed by injection or extrusion and It is an environmentally friendly cornstalk plastic manufacturing technology characterized by pressing and molding.

The present invention for achieving the above object is a method for producing a plastic molded body by mixing corn cob and synthetic resin, the maize pulverized so that the size of the corn crushed product (width × length) is 0.1 ~ 10mm × 0.1 ~ 10mm 30 ~ 80 Method for producing an eco-friendly plastic molded article using a cornstalk, characterized in that by mixing the weight% and 20 to 70% by weight of the synthetic resin, melt-mixed in the reaction vessel at a temperature of 60 to 250 ℃, injection, extrusion, pressing, molding To provide.

The corn stalk used as the main raw material of the mixture to be mixed in the present invention is collected from the farm, dried, stored and then crushed to a certain size, and the main ingredient is composed of cellulose, and the characteristics of the pulp made by using the same are shown in the following table. great. Thus, corn cellulose, a component of corn plastic, serves as a support for structures such as reinforcing bars in the moldings and is also biodegradable. This is probably the first time domestically and internationally they have found an economical biodegradable alternative to plastic blends.

As shown in Table 1, the results of the pulp experiment using the corncob can be said to be successful.

The physical properties of pulp prepared with corncob showed very encouraging values. Perhaps it is the first time in Korea and abroad that it has found a substitute for economical pulp.

Therefore, as shown in Table 1 above, in the case of mixing corn stalks showing high strength at an appropriate ratio, even when the corn stalk content ratio is greatly increased to 30 to 80% by weight during manufacture of the plastic cornstalk, the wood pulp is mainly composed of coniferous wood pulp. Unlike the case where only waste is added, the strength is not lowered and strong water resistance can be exhibited even when contacted with moisture.

In the present invention, the content ratio of corn bran as described above is at least 30% by weight or more, but when the amount is too large, the amount of the resin, which is a binder, becomes relatively small, so that sufficient adhesion between the pulverized corn bran particles cannot be exhibited. Therefore, it is preferable not to exceed 80% by weight.

The corn crushed ground is preferably used by pulverizing in the form of a sea island or a chip of a certain size in order to increase the degree of kneading when mixing with the synthetic resin and to achieve a uniform mixing, the grain size of the corn crushed ground is 0.1 mm in the horizontal × vertical If the size exceeds 10mm, the uniformity of mixing cannot be achieved, and there is a problem in that the strength characteristics are deteriorated due to the lack of compactness, and in the case of more than 10mm, the mixing time becomes longer than necessary, so that the average size It is best to zoom by grinding so that it is 0.1 mm × 10 mm wide and 0.1 mm × 10 mm long.

The above-mentioned corn crushed ground can also be mixed and mixed with waste paper made of waste pulp cardboard, waste paper and other general pulp materials, which have been conventionally used. In this case, in order to obtain the effect of the present invention, It is preferable to maintain the proportion to 50% or more in order to obtain the effect aimed at in the present invention.

When the corn cellulose is mixed with a resin, it shows a remarkably superior affinity when compared with conventional waste paper, and can ultimately improve the strength characteristics of the manufactured molded article, wherein the resins added as binders are low density polyethylene. Thermoplastic resins such as resins, high density polyethylene resins, polypropylene resins, polyvinyl chloride resins, polystyrene resins, polyurea resins, polyurethane resins, epoxy resins, melamine-formaldehyde resins, phenol-formaldehyde resins, urea-formaldehyde resins Thermosetting resins such as these may be used alone or in combination, and it is preferable to use recycled resins as much as possible in consideration of resource recycling properties which are the original objects of the present invention.

In the present invention, in addition to the crushed cornstalks and resins mainly containing cornstalks, lubricants, antioxidants, and electromagnetic waves for improving flowability when mixing fillers and mixture particles and resins, which are commonly used as necessary, to further improve bonding properties. Functional additives such as absorbents or sunscreens may be added in an amount of 0.1 to 5% by weight based on the total weight as well as glass fiber or carbon fiber as a reinforcing material.

The filler may be calcium carbonate, calcium silicate, sodium silicate, carbon black, titanium white, white carbon, mica, lignin, quartz powder, slate powder, gypsum, fly ash, briquettes, volcanic ash, loess, etc. Zero includes maleic anhydride grafted polyolefin (MPO), stearic acid, mineral oil or silane, and antioxidants include alkylphenol compounds, amine compounds, quinone compounds, 2,6-t-butyl-p-cresol, etc. Examples thereof include salicylic acid ester or benzene acid ester.

After mixing the above-mentioned corn-flour crushed product, synthetic resin and respective functional additives, a process of mixing at a temperature of 120 to 250 ° C. is performed in order to give fluidity to the synthetic resin which is a binder in the reaction mixing tank. The process is preferably performed by separating the mixing process for uniform mixing and the dough process for improving the density.

When the mixture after completing the mixing process as described above is injected or filled into a mold of a desired shape and then pressure-molded, the mixture can be cooled, thereby producing an environmentally friendly corn-coated plastic molded object.

Hereinafter will be described in more detail through embodiments of the present invention.

<Example 1>

80kg of maize crushed ground with 1mm × 5mm chips, 1kg of additives, 10kg of recycled low density polyethylene resin, 10kg of melamine-formaldehyde resin and 2kg of stearic acid were placed in a 300 liter oil-heated supermixer and the temperature was 150 ℃. Mix for about 10 minutes while maintaining. Subsequently, the mixture was placed in a kneader and mixed and kneaded for about 30 minutes while maintaining a temperature of 150 ° C. to densify each mixed raw material, and the molten mixture thus prepared was subjected to a rate of 1 ton per hour at an extrusion temperature of 150 ° C. After extruded into a plate mold having a width × length × thickness of 500mm × 500mm × 20mm and pressurized the whole mold at a pressure of 250 tons for about 15 minutes and then cooled to prepare a corn-shaped plastic plastic corn.

The molded product thus prepared was measured in the tensile strength and the flexural strength according to the method defined in the following Experimental Example and are shown in Table 2 below.

Experimental Example

Tensile strength test: The corn-shaped plastic molded body prepared from the above example was manufactured by measuring the tensile property of plastics as defined in KS M 3006, and then loaded at a loading speed of 5 mm / min using a universal material tester manufactured by Shimachu, Japan. Tensile stress at maximum load was measured.

Flexural strength test: The corn-shaped plastic molded body manufactured from the above example was manufactured by the bending test method for building boards as defined in KS M 2263, and then loaded using a universal material tester manufactured by Shimachu, Japan at a loading speed of 5 mm / min. Fracture load was measured.

Water resistance test: The cornstalk plastic molded body prepared from the above example was prepared by the absorbance and boiling water absorption rate test method of plastics determined in KS M 3027, and then the weight was measured to 0.1 mg. After fully immersed in the water, measure the weight after 24 hours and substitute the following formula to measure the water absorption. If the water absorption is less than 2% and shows good water resistance, it is "O" and the water absorption exceeds 2%. In the case of "x".

Where M2 is the weight at absorption (mg) and M1 is the weight before absorption (mg).

<Examples 2 to 8>

The experiment was performed in the same manner as in Experiment 1, but the content ratio of the low density polyethylene resin, melamine-formaldehyde resin, additives, and corn flakes was changed as shown in Table 2 below.

<Comparative Examples 1 to 4>

In the same manner as in each Experiment 1, the addition amount of low-density polyethylene resin, melamine formaldehyde resin and stearic acid was changed as shown in Table 2 without additives

As can be seen from the results of Table 2, in Examples 1 to 8 of the present invention, the strength characteristics such as tensile strength and flexural strength were excellent, whereas the comparative example showed the maximum strength in tensile strength. It was found that the strength reduction of 1/10 or less and the flexural strength showed a maximum of about 1/4 or less. The water resistance was very poor in all the items, and the additives according to the present invention were added to the strength characteristics and moisture. It was confirmed that the resistance was greatly improved.

As described above, the present invention relates to a method of manufacturing cornstalk plastics made using cornstalk, which is mainly composed of crushed cornstalk and mixed with various additives such as resins and fluidizing agents in an appropriate ratio, followed by injection and The present invention relates to a method for producing a cornstalk plastic molded body using a method of pressing and manufacturing a molded body.

In particular, there is no way to make a plastic using a new material, which is cut to a certain size and then pulverized corncob discarded so far. As a result of this invention, the use of a year-round cornstalk, a by-product produced by farmers around the world, as an environmentally friendly material can increase farmers' incomes and, in view of the infinity of cornstalk materials containing many cellulose, It can be used as a very encouraging material for the protection of the global environment because it can be replaced with In addition, it is an environment-friendly and useful invention because it can be used as a building material, various boards, blocks, various containers, plastic structures, interior materials, noise absorbers, electromagnetic wave absorbers, heat insulating materials, interior materials, and the like.

Claims (4)

In the method of producing cornstalk plastic by mixing cornstalk and resin, lubrication with respect to 30 to 80% by weight of cornstalk and 20 to 70% by weight of synthetic resin crushed to an average size (width x length) of 0.1 to 10mm x 0.1 to 10mm A method for producing cornstalk plastics, characterized in that 0.1 to 5% by weight of an additive selected from an accelerator, an antioxidant, a sunscreen or a filler is mixed and melt-mixed in a reaction tank at 60 to 250 ° C, followed by injection, extrusion and press molding. The resin to be used is thermoplastic resin such as low density polyethylene resin, high density polyethylene resin, polypropylene resin, polyvinyl chloride resin, polystyrene resin, polyurea resin, polyurethane resin, epoxy resin, melamine-formaldehyde resin, etc. And thermosetting resins such as phenol-formaldehyde resins and urea-formaldehyde resins, wherein the resins can be used alone or in combination with virgin or waste resins. The additive of claim 1, wherein the additive is a maleic anhydride grafted polyolefin (MPO), stearic acid, mineral oil or silane as a lubrication accelerator, an alkylphenol compound, an amine compound, a quinone compound or 2,6-t-butyl-p as an antioxidant. -Cresol, salicylic acid ester or benzene acid ester as sunscreen, calcium carbonate, calcium silicate, sodium silicate, carbon black, titanium white, white carbon, mica, lignin, quartz powder, slate powder, gypsum, fly ash, briquette materials Corn plastic production method, characterized in that using ash or loess delete