JP2007146092A - Composition for producing biodegradable molded product and method for production of paste, plate form material and molded product using the composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition for producing a biodegradable molded product, and a method for production of a paste, a plate form material and a molded product using the composition. <P>SOLUTION: The composition contains a glutinous material prepared by mixing, stirring and heating one or more natural material powder selected from a group consisting of wheat, starch, rice, glutinous rice, potato, corn, tapioca and sweet potato, and water at 0-80°C of a 1-15 fold amount relative to the powder, vegetable starch material powder and vegetable fibrous material powder. Each one of the glutinous material, vegetable starch material powder and vegetable fibrous material powder is contained at 1-50 wt.%, respectively, relative to the whole weight of the composition. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a composition for producing a biodegradable molded article and a method for producing a paste, a plate-like material and a molded article using the composition, and more specifically, the mechanical strength of a natural material having biodegradability. The present invention relates to a composition for producing a biodegradable molded article that has been selected, and a paste, a plate-like material, and a method for producing a molded article using the composition.

  Environmental plastics that are harmful to the human body are inherent in plastic molded products that are widely used in daily life. Environmental hormone is a general term for substances that enter the body of animals or humans and interfere with or disturb the action of hormones, and is scientifically referred to as an endocrine disrupter. The reason why it was named environmental hormone is that the chemical structure of environmental hormone resembles that of biological hormones, so it often works as if it were a natural hormone in the body. When these environmental hormones flow into the human body, they are fatal to human health, such as abnormal reproductive function, disruption of sex ratio balance, imbalance in hormone secretion, inhibition of immune function, increased breast cancer or prostate cancer. The use of substances that can generate environmental hormones has been reduced, and the use of substances that generate environmental hormones is now legal in certain countries around the world. Forbidden. Until now, awareness of environmental hormones and awareness of their side effects have not been universalized in Korea, but interest in this will soon increase in Korea, so environmental hormones that are currently used voluntarily. The use of articles made with this inducer is expected to be restrained and thus forbidden.

  At the same time, most of the various daily necessities, building materials, and packaging materials that are currently used are manufactured using wood, iron, plastic materials, etc., and post-processing after the end of the service life of these products. That is, there is a big problem in disposal. In particular, when wastes of various plastic material molded products are left in the natural world, the original shape is maintained without being spoiled for several decades to several hundreds of years, so that a serious problem regarding waste disposal has occurred. In particular, when these waste products are removed by the incineration method, a vicious cycle that eventually harms human health continues by generating carcinogens such as dioxin as well as releasing air pollution sources. There's a problem.

  In addition, in the case of biodegradable molded products presented in recent research, there is a problem that sufficient strength is not realized, and the limit as a substitute for conventional plastic products or paper products has risen. Has been. Therefore, efforts have been made to produce molded articles with enhanced strength while maintaining biodegradability, and the present invention has been devised under such a technical background.

  The technical problem to be solved by the present invention is to solve the above-mentioned problems, that is, when using various conventional living containers and building supplies, release of environmental hormones from these materials, pollution of the natural environment, waste thereof It can be replaced by conventional materials that directly threaten human health, such as interior and exterior materials made of wood, iron, and plastic materials. There is a technical problem in presenting an alternative material that can ensure strength, and a composition for manufacturing a biodegradable molded article that can achieve such a technical problem, and manufacture of a paste, a plate-like material, and a molded article using the composition. It is an object of the present invention to provide a method.

  The composition for producing a biodegradable molded article according to the present invention for achieving the technical problem to be solved by the present invention is one selected from wheat, starch, rice, glutinous rice, potato, corn and sweet potato Alternatively, gelatinized material obtained by mixing two or more natural material powders and water at 0 to 80 ° C. corresponding to 1 to 15 times the weight of the natural material powders, followed by stirring and heating. And a vegetable starch material powder and a vegetable fiber material powder to form a composition, and each of the gelatinized product, the vegetable starch material powder, and the vegetable fiber material powder comprises the above composition It is characterized in that it is composed with a content of 1 to 50% by weight relative to the total weight.

  In order to achieve the technical problem to be solved by the present invention, the method for producing a biodegradable molded article paste according to the present invention comprises (S1) wheat, starch, rice, glutinous rice, potato, corn and sweet potato. Primary mixing of the selected one or more natural powders and water of 0 to 80 ° C., which is 1 to 15 times the weight of the natural powder, (S2) A step of stirring and heating the mixture obtained in the primary mixing step to modify the gelatinized product, and (S3) the gelatinized product with a predetermined vegetable starch material powder and vegetable fiber material powder, Secondary or sequential so that each component of the composition comprising gelatinized material, vegetable starch material powder and vegetable fiber material powder is contained in an amount of 1 to 50% by weight relative to the total weight of the composition. And (S4) obtained in the secondary mixing step. A step of kneading to give a viscoelastic mixture, characterized in that the advancing contain.

  In order to achieve the technical problem to be solved by the present invention, a method for producing a biodegradable molded product for producing a plate-like material according to the present invention was manufactured according to the steps (S5) (S1) to (S4) described above. A step of rolling the biodegradable molded product paste, (S6) a step of drying the rolled and rolled product, and (S7) a step of forming a coating layer on an upper surface of the dried product. It is characterized by progressing including.

  In order to achieve the technical problem to be solved by the present invention, a method for producing a biodegradable molded product according to the present invention comprises: The method includes a preheating step of applying heat and a step (S9) of compression-molding the preheated plate-like material.

  Hereinafter, the present invention will be described in detail by way of examples, and will be described in detail with reference to the accompanying drawings in order to facilitate understanding of the present invention. However, the embodiments according to the present invention can be modified in various other forms, and the scope of the present invention should not be construed to be limited to the embodiments described in detail below. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.

  The gelatinization phenomenon, which can be said to be a point of mechanical strength, refers to a phenomenon in which starch particles are broken at a temperature of about 60 to 150 ° C. and the surface is expanded by being surrounded by moisture contained in the paste. Starch is usually a carbohydrate, made from carbon dioxide and water by photosynthesis, and is mainly composed of di-saccharide and a very small amount of mono-saccharide. Although such carbohydrates are important energy sources in various actions, many carbohydrates obtained from ripened wheat are starches that are polysaccharides, accounting for about 70% of the weight of flour. Forms the product framework. The modified gelatinized material according to the present invention serves to maximize the viscoelasticity of natural materials as well as to reinforce the network structure of the cellulose-containing material.

  The composition for producing a biodegradable molded article according to the present invention for achieving the technical problem to be solved by the present invention corresponds to an amount of 1 to 15 times the weight of the natural material powder in the natural material powder. After mixing water at 0 to 80 ° C., a gelatinized material modified by stirring and heating is prepared, and a vegetable starch material powder and a vegetable fiber material powder are mixed and prepared. At this time, the contents of the gelatinized material, the vegetable starch material powder, and the vegetable fiber material powder are the same as those of the gelatinized material and vegetable starch material modified by mixing the natural material powder and water. An amount corresponding to 1 to 50% by weight relative to the total weight of the composition comprising the powder and the powder of plant fiber material is used.

  It is desirable that titanium dioxide is further added to the gelatinized material in a content of 1 to 20% by weight with respect to the weight of the natural material powder. Such an additive component can improve the viscosity of the gelatinized product, and can also exhibit a white pigment function. Regarding the numerical range of the content of titanium dioxide to be added, if the lower limit is not reached, the effect of the addition cannot be achieved, and this is not desirable. Is not desirable.

  Regarding the numerical range of the content of the natural material powder, if the above lower limit is not reached, the viscosity of the gelatinized product is lowered when the gelatinized product is produced, and the viscosity of the composition is reduced to increase the flowability when kneaded. It is not desirable because a composition that does not reach the upper limit is produced, and if the above upper limit is exceeded, the viscosity increases and smooth mixing work is impossible when mixing, and excessive heat is generated during kneading, resulting in the This is not desirable because the bond strength is significantly reduced.

  Regarding the numerical range of the water content, when the lower limit is not reached, it is not desirable that sufficient blending with natural powder is made, and when the upper limit is exceeded, too thin blending is achieved. This is not desirable because proper viscosity cannot be secured. On the other hand, regarding the numerical range of the temperature of the water used, the viscosity required for gelatinization at a temperature lower than the gelatinization temperature of the natural material powder when the lower limit is not reached or exceeds the upper limit. Is not desirable because it is not implemented.

  Regarding the numerical range of the content of the vegetable starch material powder, when the lower limit is not reached, the content of gluten, which is a protein that gives viscosity, is insufficient, so that the necessary viscosity is not reached and formed. It is not desirable because it can not be formed into a continuous plate-like material because the bonding force of the plate-like material is also significantly reduced, and when the above upper limit is exceeded, flexibility is reduced when forming the plate-like material due to excessive gluten addition Then, after the drying process, the plate-like material is brittle and breaks.

  Regarding the numerical range of the content of the powder of the plant fiber material, when the lower limit is not reached, the matrix organization of the plate material is not sufficiently formed, so that it may be generated in the form of the plate material. This is not desirable because it becomes impossible, and when the above upper limit is exceeded, the binding force of the fibers increases when kneading due to the formation of an excessive matrix structure, so that a separation phenomenon of raw materials occurs, which is undesirable.

The natural material powder is preferably a powder of one or more materials selected from wheat, starch, rice, glutinous rice, potato, corn, tapioca and sweet potato. The vegetable starch material powder is preferably a powder of one or more materials selected from wheat, glutinous rice, rice, wheat, corn, potato, sweet potato and tapioca. The vegetable fiber material powder is a powder of one or more materials selected from among sugar cane, rice straw, straw, straw, wheat stalk, corn stalk, coconut, pasture, wild grass and cotton. Is desirable.
FIG. 1 is a process flow chart for explaining a method for producing a biodegradable molded article using the composition for producing a biodegradable molded article according to the present invention step by step (S1 to S9).

(S1) Mixing of natural powder and water <first stage>
After mixing the natural material powder as described above with water of 0 to 80 ° C. corresponding to 1 to 15 times the weight of the natural material powder, the mixture is stirred and heated to prepare a modified gelatinized product. . At this time, attention is required so that the content of the natural material powder and water and the temperature range of the water satisfy the above-described numerical ranges. In particular, when the temperature of the water used in the mixing process in the first stage is out of the required range, attention is required because there is a possibility that the viscosity of the gelatinized material may not be sufficiently achieved. In the first stage, if necessary, titanium dioxide may be further added in an amount of 1 to 20% by weight based on the weight of the natural material powder, so that the function of improving viscosity and the function of white pigment can be expressed. .

(S2) Heating step for gelatinization modification <second step>
The heating applied for denaturation of the gelatinized product in the second stage (S2) is preferably performed for 5 to 30 minutes while maintaining a temperature condition of 60 to 150 ° C. The gelatinization phenomenon can occur under optimum conditions by stirring and heating after the first stage of mixing is completed, and maintaining the heating temperature and heating time is to ensure the physical properties of the gelatinized product. Because it is an important factor, special attention is required to maintain these conditions. In particular, if the heating time is longer, depending on the amount of gelatinized material, a phenomenon occurs in which the gelatinized material located in the vicinity of the heating unit is carbonized while a temperature difference between the heating unit and the distant region occurs. . On the other hand, as a method for shortening the heating time while maintaining the gelatinization temperature, it is desirable to use a method in which high-temperature steam or hot air is brought into contact with the gelatinized material or injected into the gelatinized material.

(S3) Mixing of gelatinized material, vegetable starch material powder and vegetable fiber material powder <third stage>
An appropriate amount of vegetable starch material powder and vegetable fiber material powder are weighed and mixed with the gelatinized material modified through the second step. At this time, the contents of the gelatinized product, the vegetable starch material powder, and the vegetable fiber material powder are the contents of the gelatinized material, the vegetable starch material powder, and the vegetable fiber material powder. An amount corresponding to 1 to 50% by weight relative to the total weight was used. On the other hand, the particle size of the powder of the natural material or the vegetable starch material is more preferably about 200 wire mesh, and the particle size of the powder of the vegetable fiber material is preferably 0.00. If it is about 1-5 mm, it is still more desirable.

(S4) Kneading the mixture <4th stage>
In order to give a predetermined viscoelasticity to the mixture obtained by the third step, kneading is performed. Since the above kneading process is a factor closely related to imparting viscoelasticity, attention is required to adjust the kneading time. In the above kneading process, the kneading time is the minimum time for making the starch material powder have the maximum viscosity just before gelatinization. If this time is exceeded, carbonization occurs and the viscosity drops drastically. Therefore, it can be said that giving appropriate kneading time is a point in the kneading process. During kneading, temperature conditions and physical strength of kneading are also important factors, but this should give various conditions in relation to the amount of paste produced per hour. When the kneading process proceeds rapidly, a separation phenomenon between the fiber and the vegetable starch material occurs, and the vegetable starch material cannot be brought into an optimum viscous state. On the other hand, if the kneading time is too long, the physical properties of the paste deteriorate due to a change in the moisture state due to an increase in kneading temperature. Therefore, the optimum kneading time should be applied so that the surface temperature of the produced paste does not exceed 100 ° C.

(S5) Roll rolling stage of paste <fifth stage>
In order to manufacture the paste obtained through the fourth step into a sheet, a rolling rolling process is performed. The viscoelasticity of the paste can be maximized by the rolling process, which allows free form deformation in the molding process to be performed in the future. On the other hand, since the viscoelasticity can be changed by the ambient temperature or the like in the process of transforming the paste into a plate-like material, it is desirable to proceed within a short time. In such a rolling process, a rolling roller is arranged and a paste is put in, and a plurality of such rolling rollers are arranged in series.

(S6) Drying stage of plate-like material <Sixth stage>
The drying process of the sixth step (S6) is preferably performed sequentially in two drying sections with different heating methods and heating temperatures, that is, a first drying section and a second drying section. The first drying section is dried by an indirect heating method, and the heating temperature is desirably 50 to 130 ° C., and the second drying section is dried by a direct heating method, and the heating temperature is 50 to 140. Desirable if it is ° C. Regarding the numerical range of the heating temperature in the first drying section (indirect heating method), when the lower limit is not reached, the surface temperature of the plate material is rapidly increased by the direct heating method dryer in the second drying section. This is undesirable because only the surface of the plate-like material is dried and moisture inside the plate-like material cannot be dried. When the upper limit is exceeded, the surface of the plate-like material is rapidly dried in the first drying section. Therefore, the movement of moisture between the outside and inside of the plate-like material is remarkably lowered, and the required drying rate of the plate-like material composed through the second drying zone cannot be achieved. With regard to the numerical range of the heating temperature of the direct heating method), if the above lower limit is not reached, a plate-like material is formed with a moisture content higher than the required moisture content in the compression molding stage, and post-deformation of the finished product after the molding operation Because it becomes a problem Mashiku without undesirable because the surface of the plate-shaped member also occurs carbonization phenomenon comes to foam when exceeding the above upper limit.

  On the other hand, after further including the calendaring process after the sixth stage, the following seventh stage, which is a planned subsequent process, can be performed. Such a calendering process is performed for the purpose of preventing the surface state from being deformed unevenly while the plate-like material in the sheet state is contracted through the rolling rolling process, and keeping the surface smooth. It is a process. The amount of moisture contained in the various powder material components that make up the plate material can vary depending on the ambient temperature and humidity conditions, especially during the course of the drying process. Therefore, efforts to improve product quality through the calendering process is a desirable measure.

(S7) Coating layer formation stage <Seventh stage>
After proceeding with the drying process of the sixth step (S6), a step of forming a coating layer on the surface of the plate-like material is advanced for the purpose of improving product quality. Such a coating layer can be formed by a method of applying a coating agent or by a method of attaching a film that can be used as a coating layer. As an example of the former method, a wax-based coating agent, for example, one or more selected from paraffin wax, microwax, synthetic wax and natural wax is applied to the upper surface of the plate-like material. Can be formed. On the other hand, as an example of the latter method, a functional film layer, for example, a biodegradable substance, a photodegradable substance, a thermally decomposable substance, or an engineering plastic is selected on the upper surface of the plate-like material. It can be formed by a method of attaching the manufactured film layer.

(S8) Preheating stage of plate-like material <8th stage>
Desirably, the preheating stage proceeds to have a temperature of 40-150 ° C. Such a preheating stage is a process of imparting softness to the hard properties of the plate-like material after the above-described process is completed. Regarding the numerical range of the preheating temperature in the preheating stage, if the lower limit is not reached, the desired softness imparting effect is not exhibited, which is not desirable. It is undesirable because it works as a cause of failure.

(S9) Compression molding stage <9th stage>
It is desirable that the compression molding stage proceeds under a temperature condition of 3 to 180 ° C. and a pressure condition of ²⁰ to 350 kg / cm ² . The above temperature condition is a physical condition for adding flexibility to the plate material to be molded, and the above pressure condition is a restoring force that the product that has been molded is restored to the original plate material. Is a physical condition to be added to remove Regarding the numerical ranges of temperature and pressure related to the compression molding conditions, if the lower limit is not reached or the upper limit is exceeded, carbonization and brittleness are generated, which is not desirable.

  The process from the first stage (S1) to the fourth stage (S1) relates to a method for producing a biodegradable molded article paste according to the present invention, and includes the first stage (S1) to the seventh stage (S7). ) Relates to a method for producing a plate material for producing a biodegradable molded article according to the present invention, and the processes of the first stage (S1) to the ninth stage (S9) are the biodegradable molded article according to the present invention. It is related with the manufacturing method.

Examples 1-3
The composition for producing a biodegradable molded article having the composition according to the present invention was set so as to have the composition shown in Table 1 below. In Examples 1 to 3 having compositions classified as shown in Table 1 below, plate-like materials were manufactured using the method (S1 to S7) described above. On the other hand, it is obvious that those skilled in the art can easily carry out the subsequent steps (S8 and S9) using the resulting product to produce a compression molded product by proceeding according to the above description.

  The tensile strength, compressive strength, and elongation rate of the plate-like material produced using the composition according to Example 1 of the present invention were measured as follows, and the measured values of the paper-like plate-like material as comparison targets. Is shown in Table 2 below.

  The tensile strength and elongation in Table 2 below were measured according to the Korean Industrial Standard (KSM3006), and the compressive strength was measured using a universal material testing machine (Intron 6027).

  As can be confirmed through Table 2, the tensile strength in the case of the plate-like material according to Example 1 has a tensile strength about 18 times that of the paper-like plate-like material set as the comparative example. It can be seen that the compression strength is about 14 times stronger. On the other hand, in the case of the embodiment according to the present invention, although it is a small degree, since there is a certain degree of elongation, it retains flexibility so that the deformation of the form can easily occur without tearing in the subsequent molding process. I understand that. On the other hand, when a molded product is manufactured by advancing the compression molding process, it can be accompanied by an appropriate shape deformation while increasing the elongation rate as the flexibility increases while preheating the prepared plate-like material. Suitable for the production of molded products.

  The preferred embodiment of the present invention described above has been disclosed. Certain terms have been used herein to merely serve the purpose of explaining the invention in detail to those skilled in the art, and are intended to limit the meaning and scope of the invention as defined in the claims. It was not used to limit.

  According to the present invention, the components themselves of the composition are all materials that can be secured from nature, and it is possible to stably receive raw materials by using no other additives besides these materials. Compared to conventional plastic products, it is more environmentally friendly and harmless to the human body.

  Further, the following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the invention. The present invention should not be construed as being limited to the matters described in the drawings.

FIG. 1 is a process flow chart for explaining a method for producing a molded article using the composition for producing a biodegradable molded article according to the present invention.

Claims (20)

Corresponds to 1 to 15 times the weight of one or more natural powders selected from wheat, starch, rice, glutinous rice, potato, corn, tapioca and sweet potato After mixing water at 0 to 80 ° C., the gelatinized material obtained by stirring and heating this,
Plant starch powder,
A composition comprising plant fiber material powder,
Each of the gelatinized product, the vegetable starch material powder and the vegetable fiber material powder is composed of 1 to 50% by weight relative to the total weight of the composition. Composition for manufacture.   The composition for producing a biodegradable molded article according to claim 1, wherein titanium dioxide is further added to the gelatinized material in a content of 1 to 20% by weight based on the weight of the powder of the natural material. object.   2. The vegetable starch material powder is a powder of one or more materials selected from wheat, glutinous rice, rice, wheat, corn, potato, sweet potato and tapioca. A composition for producing a biodegradable molded article according to 1.   The vegetable fiber material powder is a powder of one or more materials selected from among sugar cane, rice straw, straw, straw, wheat stalk, corn stalk, coconut, pasture, wild grass and cotton. The composition for producing a biodegradable molded article according to claim 1, wherein: 0 to 1 to 15 times the weight of one or more natural powders selected from wheat, starch, rice, glutinous rice, potato, corn, tapioca and sweet potato A first stage of mixing water at ~ 80 ° C;
A second stage in which the mixture obtained in the first stage is stirred and heated to denature into a gelatinized product;
Each of the components of the composition comprising the gelatinized material, the powder of the vegetable starch material and the powder of the vegetable fiber material, and the gelatinized material, the powder of the vegetable starch material, and the powder of the vegetable fiber material are included. A third stage of secondary mixing sequentially or simultaneously so as to be contained at a content of 1 to 50% by weight relative to the total weight of the composition;
And a fourth step of kneading to give viscoelasticity to the mixture obtained in the third step.   The method for producing a paste for producing a biodegradable molded article according to claim 5, wherein in the first step, 1 to 20% by weight of titanium dioxide is further added to the weight of the natural material powder.   The method for producing a paste for producing a biodegradable molded article according to claim 6, wherein the second stage of stirring heating is performed for 5 to 30 minutes while maintaining a temperature condition of 60 to 150 ° C.   The plant starch powder used in the third stage is a powder of one or more materials selected from wheat, glutinous rice, rice, wheat, corn, potato, sweet potato and tapioca. The manufacturing method of the paste for biodegradable molded article manufacture of Claim 6 characterized by these.   The vegetable fiber material powder used in the third step is one selected from sugar cane, rice straw, straw, straw, wheat stalk, corn stalk, coconut, pasture, wild grass and cotton. The method for producing a paste for producing a biodegradable molded article according to claim 6, wherein the paste is a powder of two or more materials. A fifth stage of rolling and rolling the biodegradable molded article paste produced according to claim 4 or claim 5;
A sixth stage of drying the rolled and rolled product;
And a seventh step of forming a coating layer on the upper surface of the dried product, and a method for producing a plate-like material for producing a biodegradable molded article.   The drying process of the sixth step is performed by heating and drying sequentially by dividing the drying section into a first drying section and a second drying section and different heating methods and heating temperatures. The manufacturing method of the plate-shaped material for biodegradable molded article manufacture of description.   The first drying section is performed by an indirect heating method at a temperature condition of 50 to 130 ° C, and the second drying section is performed by a direct heating method at a temperature condition of 50 to 140 ° C. A method for producing a plate-like material for producing a biodegradable molded product.   The method for producing a plate-like material for producing a biodegradable molded article according to claim 10, further comprising a calendering step during the course of the drying process of the sixth stage.   The method for producing a plate-like material for producing a biodegradable molded article according to claim 10, wherein the seventh coating layer is formed by applying a wax-based coating agent.   The biodegradation according to claim 14, wherein the wax-based coating agent is one or more selected from paraffin wax, microwax, synthetic wax, and natural wax. For producing a plate-like material for producing a molded article.   The plate for manufacturing a biodegradable molded article according to claim 10, wherein the coating layer of the seventh stage is formed by attaching a functional film layer to the upper surface of the resultant product of the sixth stage. A method of manufacturing the material.   The functional film layer is a film layer manufactured as any one material selected from a biodegradable material, a photodegradable material, a heat decomposable material, and an engineering plastic. The manufacturing method of the plate-shaped material for biodegradable molded article manufacture as described in 2. An eighth stage of preheating the plate-like material manufactured according to claim 10;
And a ninth step of compression-molding the preheated plate-like material.   The method for producing a plate-like material for producing a biodegradable molded article according to claim 18, wherein the eighth step is performed so as to have a temperature of 40 to 150 ° C. The method according to claim 18, wherein the ninth step is performed under a temperature condition of 3 to 180 ° C and a pressure condition of ²⁰ to 350 kg / cm ² .

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