KR20050070826A - Formed products made from rice-straw and a method of manufacturing them - Google Patents

Abstract

The present invention relates to a dry rice straw molded product mainly made of rice straw and rice starch, which are commonly available in rural areas, and a method of manufacturing the same, and has been used as a main raw material for electronic product packaging containers, disposable food containers, cosmetic containers, and the like. Compared to conventional styrofoam and plastic injection molding products, it is not only economical, but also applicable to the manufacture of various items such as seed seedlings, egg boards, and components of vehicle air cleaners, lightweight, high strength, excellent weather resistance and moisture resistance. The present invention relates to an environmentally friendly dry rice straw molded product and a method of manufacturing the same.

Description

Formed products made from rice-straw and a method of manufacturing them}

The present invention relates to a rice straw molded product and a method of manufacturing the same, and more specifically, rice straw and rice starch, which are commonly available at very low cost in rural areas, as main raw materials, such as electronic product packaging containers, disposable food containers, cosmetic containers, etc. Compared to the conventional styrofoam and plastic injection molding products that have been used as the main raw materials, it is not only economical, but also applicable to the production of various items such as seed seedlings, egg plates, and air cleaner components, and is lightweight and high in strength. The present invention relates to a dry rice straw molded product having excellent weather resistance and moisture resistance and an environmentally friendly method.

BACKGROUND ART In manufacturing containers for various daily necessities and products such as electronic packaging containers, disposable food containers, cosmetic packaging containers, seed seedlings, egg boards, synthetic resins such as styrofoam and plastics have been commonly used as raw materials.

In other words, these synthetic resins and plastic products are used for the packaging and transportation of a wide variety of products because of their light weight and wide application potential. It takes a lot of volume and costs a lot of treatment and disposal, there is a disadvantage that high heat, odor, harmful gases occur in the process.

In addition, the use of plastics or synthetic resins is not desirable for the international economy in Korea, where resources are not abundant, and the heat distortion coefficient is so large that the torsional shape occurs when the heat is applied, and the degree of expansion and contraction creates a gap between the joints. There is a weak problem.

In particular, as the interest in the environment has increased worldwide, and researches on how to recycle resources have been actively conducted, patent applications on recycling of waste resources have been increasing. For example, Korean patent application No. 1992 -13401 (filed on July 27, 1992) discloses a "manufacturing method for synthetic wood using waste resources". The manufacturing method according to the present invention uses waste resources to increase resource utilization and reduce environmental pollution. It has the advantage of preventing, but simply by crushing rice straw and sawdust, gluing it with urea resin adhesive and then compression molding, the composition of the synthetic wood produced by the manufacturing method is not as compact, as a raw material Various uneven shapes due to the rice straw and sawdust used are not superior in terms of thermoplastic and thermoforming and do not form a smooth outer surface It had a disadvantage that you can not impose the application of such a formation.

In addition, the present inventors in the domestic patent application No. 2002-52298, the environmentally friendly and economical constituent members of the air cleaner, that is, compared to the metal, plastic, and urethane which is a raw material for manufacturing the conventional air cleaner using the raw material recycled waste paper, namely Fixed caps and porous networks and methods of manufacturing the same have been disclosed. According to the present invention, the manufacturing method is immersed 120-180 parts by weight in 350-500 parts by weight of water, and 5-10 parts by weight of caustic soda to swell and homogenize to obtain a papermaking solution, paraffin wax, acrylic in the papermaking solution Amide, colloidal silica, and polyvinyl alcohol are added and mixed in a stirrer, and the mixed papermaking solution is transferred to a tank to immerse a molding die to absorb the papermaking solution, and to compress and dry it.

Following the development of environmentally friendly automotive components as described above, the present inventors have continued to research packaging containers and products made of various materials by applying a wider range of natural materials and methods, resulting in products using conventional styrofoam or plastic. Dry rice straw molded products that can be applied to various molded products such as electronic product containers, disposable food containers, cosmetic containers, seed seedlings, egg plates, vehicle air cleaner components by using rice straw as a main raw material The manufacturing method was invented.

An object of the present invention is to provide a rice straw molded product and its manufacturing method that can maximize the utilization of resources and prevent environmental pollution caused by styrofoam and plastic by manufacturing a variety of molded products using rice straw as a main raw material.

It is still another object of the present invention to provide various molded products using rice straw which is much more economical and easier to use than raw materials of conventional plastic and foamed styrofoam molded products, and a method of manufacturing the same.

It is still another object of the present invention to simplify the manufacturing process and to provide a variety of molded products of superior quality and economical methods thereof.

It is still another object of the present invention to provide various molded products using rice straw and a method of manufacturing the same, which have a high strength against external impact, and are significantly superior in flame retardancy, heat insulation, and sound insulation to conventional products.

Still another object of the present invention is to recycle various rice straws that do not cause environmental pollution due to biodegradation, to prevent acidification of soil, and to make various molded products using rice straws that contribute to environmental protection while maintaining compatibility with the environment. To provide.

It is still another object of the present invention to overcome various problems of environmentally harmful environmental hormones such as dioxins from plastics and styrofoam, which have been conventionally used in the manufacture of packaging containers for various products, and to provide various molded products using environmentally friendly rice straws and methods for manufacturing the same. To provide.

The configuration of the present invention for achieving the above object is as follows.

That is, the manufacturing method of the molded product using the rice straw according to the present invention, the raw material milling process to crush the rice straw into a pulverizer, and to dry the finely chopped starfish, which is boiled in water separately and then chopped and pulverized with a grinder; 300-500 parts by weight of rice straw powder and 35-50 parts by weight of wheat starch powder obtained by the material pulverization process were immersed in 3500-5000 parts by weight of the filtrate boiled the wood, 10-20 parts by weight of colloidal silica and poly Raw material solution preparation step of adding and stirring 35-50 parts by weight of vinyl alcohol (PVA); And a molding process of transferring the raw material solution to a tank and immersing the molding die so that the raw material solution is absorbed into the molding die, and compressing and drying the raw material solution.

Rice straw molded product according to the present invention is manufactured by the method as described above, such molded products are electronic container, disposable food container, cosmetic container, seed seedlings, egg plate, vehicle air cleaner components, as well as conventional As long as styrofoam, resin and plastic products have been used, there are a wide variety of applications.

Rice straw used in the present invention is readily available as rice straw discarded after harvesting rice at a farmhouse, and biodegradability, which is one of the characteristics of rice straw, prevents soil pollution and environmental pollution that occurs later, but rather composts to soil. It is an environmentally friendly material.

In addition, the locus used in the present invention has excellent biodegradability as a raw material of vegetable radish, and was conventionally used as a conventional grass due to its adhesiveness as well as food, which has various appearances as it is because of its slippery and slippery properties. Since it is difficult to use as a raw material of a molded article, in the present invention, the boiling starch is boiled sufficiently in boiling water, dried, and then powdered, and the filtrate, which has boiled the starfish, is used as a mixed medium of the whole molded product. Locust is also an environmentally friendly material that does not later cause soil and environmental pollution but rather composts into the soil.

In the raw material solution manufacturing process of the present invention, 17-33 parts by weight of calcium hydroxide (slaked lime) and 35-50 parts by weight of paraffin wax may be additionally added.

When described in detail step-by-step rice straw molded product according to the present invention and its manufacturing method as follows.

1. Material powdering process

Cut rice straw into 6-10 cm or less with a cutter.

Since rice straw has a smooth surface, in order to powder the rice straw cut into small pieces by 0.3 millimeter or less, a steel sheet made of stainless steel with a perforation hole of 0.3 mm or less is attached to the spout of the powder mill, and the rice straw passes through the steel sheet. To be powdered.

Locust is slippery, slippery and usually entangled, making it difficult to chop and powder in this state. Therefore, in the present invention, put the wood starch in boiling water, boil it sufficiently, dry the wood starch, dry it, and then cut the hard wood starch into the length of 3-5cm with a shredder and powder it into 0.3mm or less with a powder.

The filtrate obtained from the starfish is used in the following raw material solution manufacturing process.

In this case, the particles of rice straw and bamboo starch should be powdered to 0.3mm or less to have the dispersibility necessary when blending with the constituent solution of the molded product, so that they are well combined with the powder particles to make the tissue dense and cohesive with other components. It has excellent effect in tensile strength and durability, heat insulation and sound insulation effect.

2. Raw Material Solution Manufacturing Process

300-500 parts by weight of the rice straw powder and 35-50 parts by weight of the wheat starch powder are immersed in 3500-5000 parts by weight of the filtrate, which has been boiled out of the woodworm, and homogenized by stirring for 10-20 minutes with a stirrer.

10-20 parts by weight of colloidal silica was added to the homogenized stock solution and stirred for 10-20 minutes. The colloidal silica is added to the solidity of the shape while binding the particles well to increase the cohesive force and maintain the tensile strength and durability of the product, as an ultra-fine colloidal solution of silicic anhydride, in general, fine adsorption force in the fine space and strong adhesion, cotton weaving, It is variously used as a wool textile sizing agent, a catalyst, and the like. This also has the advantage of not causing environmental pollution.

Then add 35-50 parts by weight of polyvinyl alcohol to the homogenized stock solution and stir for 10-20 minutes. The polyvinyl alcohol is added to have a cohesive force with the mixed components to increase the tensile strength, durability and toughness to form a film on the surface of the molding, water-soluble in the synthetic polymer and white powder as interlocking, penetrability, tensile strength, tensile It has excellent strength, oil resistance, moisture permeability, and abrasion resistance such as surface coating, and is widely used. It is odorless and nontoxic, so it does not cause environmental pollution.

17-33 parts by weight of calcium hydroxide may be optionally added to the homogenized stock solution, and then stirred for 10-20 minutes with a stirrer. Calcium hydroxide may be added as a tissue binder of the product after molding. In general, it is a white alkaline powder with a bitter bitterness. It is used for construction, fertilizer, bleaching powder, pulp, papermaking, and prevention of acidification of soil for agrochemicals, calcium salts, hair loss agents, sugar refining, water softening, starch syrup, and food industry pharmaceuticals. It is used. It is not a harmful substance and does not cause environmental pollution.

In addition, 35-50 parts by weight of paraffin wax (dissolved in 50-80 parts of alcohol) may be optionally added to the homogenized stock solution, followed by stirring for 10-20 minutes. The paraffin wax is added for moisture proof of the product after molding, and generally used in the manufacture of candles, crayons, cosmetics, weaving, gloss, water repellent and the like. It is also not a hazardous substance and does not cause environmental pollution.

In addition, 10-15 parts by weight of the dye may be selectively added to the homogenized stock solution, followed by stirring for 5-10 minutes.

Calcium hydroxide, colloidal silica, polyvinyl alcohol, paraffin wax and dye added to the homogenized stock solution in the above process may be added to the stirrer at once and stirred. However, for ease of mixing process, it is most preferable to add and stir the additives in order.

3. Compression Process

The raw material solution prepared in the raw material solution manufacturing process is transferred to a tank, and then slowly dissociated so that the solution does not precipitate. An engraved mold having a 0.2 mm mesh is immersed in the raw material solution tank to absorb the raw material solution for 5 to 10 seconds.

Then, the immersed engraved mold was raised and compressed at 80-100 kgf / ㎠ pressure for 7-10 seconds with an embossed mold at a temperature of 100-120 ° C. to enhance the binding and tensile strength of the mixture and contained in the material through the pores. Inhale the moisture in the vacuum for 3-5 seconds.

The moldings in the intaglio molds are then sucked into the vacuum and transferred to the dryer while raising the embossing mold.

According to the prior art, molding was performed only at high temperature conditions of about 200-250 ° C. when compressing a resin product including polypropylene, but the present invention requires a relatively low temperature condition of 100-120 ° C. Silver is more economical than the prior art in terms of power consumption.

4. Drying process

The moldings are dried in a tunnel belt dryer at a temperature of 80-90 ° C.

The time, temperature and pressure conditions in the molding compression process and the drying process have been found by the inventors of the present invention to the optimum experimental conditions by experiment.

The appearance of the rice straw molded product according to the present invention is determined by a molding mold (mould), according to the use of the product electronic container, disposable food container, cosmetic container and packaging container, seed seedlings, egg plate, vehicle air cleaner composition The member can be used in various ways.

If the rice straw molded product according to the present invention and a manufacturing method thereof will be described in more detail with reference to Examples.

Example 1

The rice straw was cut to approximately 6-10 cm with a cutter. Then, a steel sheet made of 0.3 mm perforated hole stainless steel was attached to the spout of the powder machine, and the finely divided rice straw was passed through the steel sheet to obtain a powder having a diameter of 0.3 mm or less. This process was repeated to yield approximately 500 g of rice straw powder.

Meanwhile, 1.5 g of water was added to 50 g of entangled wood, and the mixture was boiled and heated until the volume of the whole wood solution became 1 l. The starfish was then picked up and dried in a dryer. The dried loach was very hard, and it was put into a shredder, cut into 3-5 cm, and powdered to less than 0.3 mm in the grinder. This process was repeated to obtain about 50 g of loot powder.

500 g of the rice straw powder and 50 g of the wheat starch powder were immersed in 5000 g of the filtrate from which the starfish was removed, followed by homogenization by stirring for 20 minutes with a stirrer.

30 g of calcium hydroxide was added to the homogenized stock solution and stirred for 20 minutes with a stirrer. Then, 20 g of colloidal silica was added and stirred for 20 minutes.

Then, 50 g of polyvinyl alcohol was added thereto and stirred for 20 minutes. Then, 50 g of paraffin wax dissolved in 75 g of alcohol was added, followed by stirring for 20 minutes.

Further, 12 g of a yellow dye was added to the raw material solution, followed by stirring for 10 minutes.

The raw material solution thus obtained was transferred to a tank, and then slowly dissociated so that the solution did not settle, and a disposable food container-shaped intaglio mold (mold) formed of a porous 2-5 mm space made of aluminum with a stainless steel space 0.2 mm inside. Immerse the mold with the net in the raw material solution tank to absorb the raw material solution for 10 seconds, raise the negative mold, and then press the embossed mold at 100-120 ℃ for 10 seconds at 90-100kgf / ㎠ pressure. It was compressed and inhaled for about 5 seconds in a vacuum to remove moisture contained in the material.

The moldings in the intaglio molds were then sucked into a vacuum and transferred to the dryer while the embossed molds were raised, and dried in a tunnel belt dryer at 80-90 ° C.

The disposable food container manufactured according to the present invention has a lighter weight, superior strength, smooth surface, and beautiful appearance than the disposable food container made of conventional styrofoam or plastic. In addition, raw materials are inexpensive and readily available, which is very economical in terms of manufacturing cost, and can greatly contribute to environmental conservation due to biodegradability.

In addition, the molded article according to the present invention was found to be superior in flame retardancy, heat insulation, and sound insulation as compared to conventional styrofoam and plastic products.

Example 2

The same manufacturing process as in Example 1 was carried out, but a porous net for air cleaner and a cap member shape were used as the molding die.

The porous net and cap member for air cleaner thus manufactured are lighter, more excellent in strength and durability than the conventional air cleaner component using urethane, metal or synthetic resin, and are much cheaper in manufacturing cost and environmentally friendly. The cleanliness by the test was also found to be excellent.

Example 3-6

The same manufacturing process as in Example 1 was performed, but a video camera packaging container, a cosmetic container, a seed seedling plate, and an egg plate were used as a molding frame.

The products thus produced are also superior in strength and durability in comparison with products using conventional plastics or synthetic resins, have no odor as in conventional plastics and styrofoam products, and are much more economical in terms of manufacturing cost.

The manufacturing method of the present invention is applicable to the production of a variety of products according to the shape of the mold as well as disposable food container, electronics container, cosmetic container, seed seedling or egg plate as in the above embodiment.

The present invention is to maximize the utilization of resources and to prevent environmental pollution by manufacturing a variety of molded products using rice straw as the main raw material.

In addition, compared to the raw material of the plastic and foamed styrofoam molded products, using a more economical and easy to use rice straw and simplify the manufacturing process, it is possible to provide a variety of molded products and a manufacturing method of superior quality more economically.

According to the present invention, it is possible to provide various environmentally friendly molded products having high strength, excellent flame retardancy, heat insulating property, and sound insulation, and which do not release environmental hormones such as dioxins, and methods for producing the same.

Claims (8)

Process the raw material powder to chop rice straw into powder with a grinder, and to dry separately the wood starch boiled in water, and then cut and powder into a grinder; 300-500 parts by weight of rice straw powder and 35-50 parts by weight of wheat starch powder obtained by the material pulverization process were immersed in 3500-5000 parts by weight of the filtrate boiled wood pellets, 10-20 parts by weight of colloidal silica and polyvinyl alcohol (PVA ) 35-50 parts by weight of the raw material solution preparation and stirring process; And a molding process of transferring the raw material solution to a tank and immersing a molding die so that the raw material solution is absorbed in the molding die, and compressing and drying the raw material solution. The method according to claim 1, wherein 17 to 33 parts by weight of calcium hydroxide and 35 to 50 parts by weight of paraffin wax are added and stirred in the raw material solution manufacturing process. The method of claim 1 or 2, wherein the rice straw powder is cut into 6-10 cm or less with a cutter and then powdered to a size of 0.3 mm or less. The method according to claim 1 or claim 2, wherein the wood pellets are obtained by boiling the tangled wood pellets in water, dried and dried, and then cutting the hard wood pellets into 3-5 cm or less with a shredder and powdering to 0.3 mm or less with a powder. Method for producing a molded product using the rice straw characterized in that. The method of claim 1 or 2, wherein 10-15 parts by weight of the dye is further added in the raw material solution manufacturing process. 300-500 parts by weight of rice straw powder and 35-50 parts by weight of wheat starch powder, 10-20 parts by weight of colloidal silica and 35-50 parts by weight of polyvinyl alcohol (PVA) were added and stirred to 3500-5000 parts by weight of the filtrate boiled woodworm A molded product using rice straw produced by compressing and drying the obtained raw material solution in a molding die. The molded article using rice straw according to claim 6, wherein 17-33 parts by weight of calcium hydroxide and 35-50 parts by weight of paraffin wax are further added to the raw material solution. The molded article according to claim 6, wherein the molded article is any one of an electronic container, a disposable food container, a cosmetic container or a packaging container, a seed seedling plate, an egg plate, and an air cleaner component.