KR100758646B1 - Composition for production biogradable molded articles, method for production paste, sheet and molded articles using the same - Google Patents

Abstract

A method for preparing a paste for an environmentally friendly biodegradable molded product, a method for preparing a plated material for a biodegradable molded product by using the paste, and a method for preparing a biodegradable molded product by using the plated material are provided to obtain a sufficient mechanical strength and to supply raw materials stably. A paste is prepared by (S1) mixing at least one natural material powder selected from wheat, starch, rice, glutinous rice, potato, corn, tapioca and sweet potato and 1-15 times weight of water of 0-80 deg.C; (S2) heating the mixture with stirring at 60-150 deg.C; (S3) mixing 1-50 wt% of the obtained one with 1-50 wt% of at least one vegetable starch powder selected from wheat, starch, rice, glutinous rice, potato, corn, tapioca and sweet potato and 1-50 wt% of at least one vegetable fiber powder selected from sugar cane, rice straw, barley straw, reed, wheat stalk, corn stalk, coconut, grass and cotton; and (S4) pasting the obtained mixture.

Description

Composition for production biogradable molded articles, method for production paste, sheet and molded articles using the same}

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

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

The present invention relates to a method for manufacturing a biodegradable molded article, a plate-like material and a molded article, respectively, and more specifically, a biodegradable molded article for manufacturing a biodegradable molded article, a plate material and a molded article each of which improves the mechanical strength of the biodegradable natural materials It relates to a manufacturing method of.

Environmental hormones that are harmful to the human body are inherent in plastic molded articles that are commonly used in daily life. Environmental hormone is a generic term for substances that enter the body of an animal or human and interfere with or disrupt the action of hormones. Scientifically, it is called an endocrine disruptor. The name of environmental hormone is because the chemical structure of environmental hormone is similar to that of biological hormones, so it acts as if it is a natural hormone in the body. When these environmental hormones enter the human body, they cause fatal problems for human health such as reproductive dysfunction, disruption of sex ratio, imbalance of hormone secretion, impaired immune function, increased breast cancer or prostate cancer. In addition, countries around the world now legally prohibit the use of substances that produce environmental hormones for certain household products, especially baby products. Although awareness of environmental hormones and awareness of their side effects are not common in Korea, interest in them will soon increase in Korea, and therefore, the use of molded products made of environmental hormone-inducing substances that are currently used involuntarily Is restrained, even certain to be banned.

In addition, most of the various household goods, construction materials, and packaging materials that are currently used are manufactured using wood, steel, plastics, etc., and these products have a great problem in post-processing, that is, disposal after the end of their useful life. have. In particular, when molded plastic wastes of various plastic materials are left in the natural world, since their original form is maintained without decay for decades to hundreds of years, serious problems related to waste disposal are generated. In particular, when these waste products are removed by the incineration method, there is a problem that not only emits air pollutants but also generates carcinogens such as dioxins in the natural world, thereby causing a vicious cycle of damaging human health.

In addition, in the case of biodegradable molded articles that have been recently researched, there is a problem in that sufficient strength is not realized, and as a substitute for conventional plastic products or paper products, there is a limit. Therefore, strength is maintained while maintaining biodegradability. Efforts have been made to produce reinforced molded articles, and the invention has been devised under this technical background.

The technical problem to be solved by the present invention is that the use of the various problems described above, namely, various conventional living containers or building supplies, has a problem in releasing environmental hormones from these materials, pollution of the natural environment, disposal of the waste, etc. There is a technical problem to propose an alternative material that can secure the strength enough to replace the existing materials, such as wood, steel, plastic materials, etc. that directly threaten human health. It is an object of the present invention to provide a method for manufacturing each of the dough, plate-like material and molded article for producing a biodegradable molded article that can achieve the technical problem.

The composition for producing a biodegradable molded article according to the present invention for achieving the technical problem to be achieved by the present invention, wheat, starch, rice, glutinous rice, potato, corn and sweet potato selected from one or two or more natural material powder and the weight of the natural material powder Gelatinized water obtained by mixing the water of 0 to 80 ℃ corresponding to the amount of 1 to 15 times of, and stirring and heating it; Vegetable starch powder; And a vegetable fibrous material powder, comprising the composition, wherein each of the fodder, vegetable starch powder, and vegetable fibrous material powder is characterized in that it is composed in an amount of 1 to 50% by weight based on the total weight of the composition.

Dough manufacturing method for producing a biodegradable molded article according to the present invention for achieving the technical problem to be achieved by the present invention, (S1) wheat, starch, rice, glutinous rice, potatoes, corn and sweet potato selected one or two or more natural powder ; And a first step of first mixing water at 0 to 80 ° C. in an amount of 1 to 15 times the weight of the natural material powder; (S2) a second step of modifying the mixture obtained by the first mixing step by stirring and heating to a hoge; (S3) Mixing a predetermined vegetable starch powder and a vegetable fiber powder to the hobhide, wherein each component of the composition consisting of the second step of the hobhwa, vegetable starch powder and vegetable fiber powder is the total weight of the composition A third step of sequentially or simultaneously mixing the second to be included in an amount of 1 to 50% by weight; And (S4) kneading for imparting viscoelasticity to the mixture obtained in the third step.

The plate-like material manufacturing method for producing a biodegradable molded article according to the present invention for achieving the technical problem to be achieved by the present invention, (S5) rolling the dough for producing a biodegradable molded article prepared according to the steps (S1) to (S4) described above Rolling; (S6) drying the rolled result; And (S7) forming a coating layer on the dried resultant upper surface.

Biodegradable molded article manufacturing method according to the present invention for achieving the technical problem to be achieved by the present invention, the pre-heating step of preliminarily applying heat to the plate-shaped material prepared according to the (S8) step (S5) described above (S8) ; And (S9) compression molding the preheated plate-like material.

Hereinafter, the present invention will be described in detail with reference to examples, and detailed description will be made with reference to the accompanying drawings in order to help understanding of the present invention. However, embodiments according to the present invention can be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

Gelatinization, the core of mechanical strength, refers to a phenomenon in which starch particles are destroyed at a temperature of about 60 to 150 ° C., and the surface is expanded by being surrounded by moisture in the dough. Starch is a carbohydrate made from carbonic acid gas and water by photosynthesis, and is mainly composed of di-saccharides and very small amounts of mono-saccharides. Although these carbohydrates are an important energy source for many operations, most carbohydrates obtained from mature wheat are polysaccharide starch, which is composed of about 70% of the weight of flour to form the backbone of the product. The modified fodder according to the present invention plays a role of maximizing the viscoelasticity of the natural material with the function of reinforcing the network structure of the cellulose-containing.

Biodegradable molded article manufacturing composition according to the present invention for achieving the technical problem to be achieved by the present invention is a natural material powder mixed with water of 0 to 80 ℃ corresponding to the amount of 1 to 15 times the weight of the natural material powder Thereafter, the mixture is stirred and heated to prepare a modified hodge, which is prepared by mixing vegetable starch powder and vegetable fiber powder. At this time, the content of each of the hydrate, vegetable starch powder and the vegetable fiber powder is 1 to a total weight of the composition consisting of the natural matter powder and water mixed with the modified hydrate, vegetable starch powder and vegetable fiber powder. Use an amount equal to 50% by weight.

It is preferable that titanium dioxide is further added to the hobide in an amount of 1 to 20% by weight based on the weight of the natural material powder. These additives can improve the viscosity of the luxury product, it may be expressed a white pigment function. Regarding the numerical range of the added titanium dioxide content, when the lower limit is not reached, the effect of the addition is not achieved, and when the upper limit is exceeded, the functional expression is proportional to the addition. It is not desirable because it is not supported.

With respect to the numerical range for the natural powder content, if the lower limit is less than the lower limit, the viscosity of the luxury product is thinned during the formation of a hydrate, so that the composition is less than the required viscosity of the composition due to the increase of flowability during kneading. It is not preferable because it exceeds the upper limit, the viscosity is high, it is not possible to smooth mixing operation during mixing, it is not preferable because the bonding strength of the plate material is significantly reduced due to the generation of excessive heat during the kneading process.

With respect to the numerical range for the water content, when the lower limit is not reached, it is not preferable because a sufficient blending with the natural material powder is not achieved. If the upper limit is exceeded, the mixture is too thin to secure proper viscosity. It is not desirable because it can not. On the other hand, in relation to the numerical range for the temperature of the water used, if the lower limit or the upper limit is exceeded, it is not preferable because the required viscosity is not achieved because the gelatinization is performed at a temperature lower than the gelatinization temperature of the natural powder.

In relation to the numerical range for the vegetable starch powder content, if the lower limit is less than the content of gluten (gluten) which is a protein that makes the viscosity is less than the required viscosity, the binding force of the plate material formed In addition, it is not preferable because it can not be made into a plate-shaped material of a continuous form remarkably falling off, if the upper limit is exceeded, the flexibility of the plate-like material is reduced due to excessive gluten input, brittleness to the plate material when the drying process It is not preferable because the phenomenon which is given and broken occurs.

Regarding the numerical range for the vegetable fiber powder content, when it falls below the lower limit, since the matrix organization of the plate material is not sufficiently formed, it is not preferable because the formation of the plate material becomes impossible. In case of exceeding the upper limit, it is not preferable to cause separation of raw materials because the binding force of the fiber increases when the dough is formed due to excessive matrix structure formation.

The natural material powder is preferably wheat, starch, rice, glutinous rice, potato, corn, tapioca and sweet potato powder of one or two or more selected materials. The vegetable starch powder is preferably wheat, glutinous rice, rice, barley, corn, potatoes, sweet potatoes and tapioca selected one or two or more material powder. The vegetable fibrous material powder is preferably one or two or more material powders selected from sugar cane, rice straw, barley straw, reed, wheat straw, corn stalk, coconut, grass, wild grass and cotton wool.

1 is a process flowchart for explaining a method for producing a biodegradable molded article using the composition for producing a biodegradable molded article according to the present invention in step (S1 to S9).

(S1) Natural powder and water mixed <first step>

After mixing the water of 0 to 80 ℃ corresponding to the amount of 1 to 15 times the weight of the natural material powder to the natural material powder according to the above, and stirred and heated to prepare a modified hodge. At this time, attention should be paid to the content of the natural powder and water and the temperature range of the water to satisfy the above-mentioned numerical range. In particular, when the temperature of the water used in the mixing process of the first step is out of the required range, attention must be paid because the viscosity of the luxury product may not be sufficiently provided. In the first step, when titanium dioxide is further added in an amount of 1 to 20% by weight based on the weight of the natural material powder, the viscosity improvement function and the white pigment function may be expressed as necessary.

(S2) heating step for denatured cargo <second step>

In the second step (S2), the heating proceeds for the modification of the luxury product is preferably performed for 5 to 30 minutes while maintaining the temperature conditions of 60 to 150 ℃. After the mixing of the first step is completed, stirring and heating may be performed to achieve gelatinization at optimum conditions. The maintenance of the heating temperature and the heating time is an important factor for securing the physical properties of the gelatinous water, and thus maintaining these conditions. Particular attention is to be paid to. In particular, when the heating time is prolonged, a temperature difference between the heating part and the heating part may occur depending on the amount of luxury water, and the phenomenon in which the cargo is located near the heating part may be carbonized. On the other hand, as a method for maintaining the gelatinization temperature and shortening the heating time, it is preferable to use a method of bringing hot vapor or hot air into contact with or injecting into the vapor.

(S3) Mixture of fodder and vegetable starch powder and vegetable fiber powder <3rd step>

The starch powder and vegetable fibrous material powder are mixed and weighed into the modified hod cargo through the second step. In this case, the content of each of the hobhide, vegetable starch powder and the vegetable fiber powder is an amount corresponding to 1 to 50% by weight relative to the total weight of the composition consisting of the hobbi, vegetable starch powder and vegetable fiber powder. Used. On the other hand, the particle size of the natural material powder or vegetable starch powder is more preferably about the size of 200 wire mesh, and the particle size of the vegetable fiber material powder is more preferably 0.1 to 5 mm.

(S4) Mixture Dough <Step 4>

Kneading is performed to impart a predetermined viscoelasticity to the mixture obtained by the third step. Since the kneading process is a close factor with the impart viscoelasticity, attention is required to control the kneading time. In the kneading process, the kneading time is the minimum time for making the starch powder into the highest viscosity just before gelatinization. If this time is exceeded, the kneading time is carbonized and the viscosity falls extremely. To give proper dough time can be said to be the core of the kneading process. Temperature conditions and the physical strength of the dough during the kneading is also an important factor, which must be given to various conditions in conjunction with the amount of dough produced per hour. If the kneading process is performed rapidly, separation of fiber and vegetable starch may occur, and the vegetable starch may not be made into an optimal viscosity state. On the contrary, if the kneading time is too long, the physical properties of the kneading are lowered due to the change in the moisture state due to the rise of the kneading temperature. Therefore, the optimum kneading time should be carried out within the range of the surface temperature of the resulting dough does not exceed 100 ℃.

(S5) Dough rolling rolling step <the fifth step>

Rolling rolling process is performed to manufacture the dough obtained through the fourth step into a sheet. The rolling process can maximize the viscoelasticity of the dough, thereby acting to enable free form deformation in the subsequent molding process. On the other hand, since the viscoelasticity may change due to the ambient temperature in the process of the dough is transformed into a plate-like material, it is preferable to proceed within a short time. This rolling process is carried out by arranging the rolling rollers, and putting the dough, this rolling rollers were arranged in series.

(S6) plate material drying step <sixth step>

The drying process of the sixth step (S6) is preferably carried out sequentially by dividing into two drying sections, that is, the first drying section and the second drying section, the heating method and the heating temperature accordingly. The first drying section is dried by the indirect heating method, the heating temperature is preferably 50 to 130 ℃, the second drying section is dried by the direct heating method, the heating temperature is 50 to It is preferable if it is 140 degreeC. In relation to the numerical range of the heating temperature of the first drying section indirect heating method, if the lower limit value is not reached, the surface temperature of the plate material rapidly rises by the direct heating method dryer of the second drying section, It is not preferable because only the surface is dried so that the moisture inside the plate can not be dried, and if the upper limit is exceeded, the surface of the plate is rapidly dried in the first drying section. It is not desirable to achieve the required drying rate of the plate material formed through the second drying section because the movement is significantly reduced, and in relation to the numerical range for the heating temperature of the second drying section (direct heating method), If the lower limit is not reached, the plate material is formed at a moisture content higher than the required moisture content in the compression molding step. Since the post-deformation of the finished product is a problem, it is not preferable, and when the upper limit is exceeded, the surface of the plate-like material is foamed and carbonization is also generated, which is not preferable.

On the other hand, after the sixth step after the further including the calendaring process, it is also possible to proceed to the seventh step of the next scheduled process. This calendering process is an additional process for the purpose of preventing the surface state from being unevenly deformed while the sheet-like plate material is shrunk through the rolling rolling process, and to keep the surface smooth. The amount of moisture impregnated in the various components of the plate material itself may vary according to the ambient temperature or humidity conditions, and in particular, during the drying process, the shrinkage of the plate material may be a factor depending on the drying rate or drying amount. Therefore, efforts to improve the productability through the calendering process will be a desirable measure.

(S7) coating layer forming step <seventh step>

After the drying process of the sixth step (S6), the step of forming a coating layer on the surface of the plate-like material for the purpose of improving product quality. The coating layer may be formed by applying a coating agent, or may be formed by attaching a film that can be used as a coating layer. As an example according to the former method, a wax-based coating agent, for example, paraffin wax, microwax, synthetic wax and any one or two or more coatings selected from natural wax may be formed by applying to the upper surface of the plate-like material. On the other hand, as an example according to the latter method, formed by attaching a functional film layer, such as a biodegradable material, a photodegradable material, a thermally decomposable material, and a film layer made of any one selected from engineering plastics on the upper surface of the plate material. You may.

(S8) Plate material preheating step (8th step)

The preheating step of the seventh step (S7) is preferably proceeded to have a temperature of 40 to 150 ℃. This preheating step is a process of providing ductility to the hard properties of the plate material after the process of the previous step is completed. Regarding the numerical range for the preheating temperature of the preheating step, if the lower limit is not reached, the desired soft addition effect is not expressed, and if the upper limit is exceeded, the plate material may be carbonized and the product is defective. It is undesirable because it can act as a factor.

(S9) compression molding step <ninth step>

The compression molding step of the ninth step (S9) is preferably carried out under a temperature condition of 3 to 180 ℃ and a pressure condition of 20 to 350 kg / ㎠. The temperature condition is a physical condition for adding ductility to the plate member to be molded, and the pressure condition is a physical condition added to remove a restoring force to be restored to the original plate member. . Regarding the numerical ranges for the temperature and pressure related to the compression molding condition, when the temperature falls below the lower limit or exceeds the upper limit, carbonization and brittleness occur, which is not preferable.

The process of the first step (S1) to the fourth step (S1) relates to the manufacturing method of the dough for producing a biodegradable molded article according to the present invention, the process of the first step (S1) to the seventh step (S7) It relates to a method for producing a plate-like material for producing a biodegradable molded article according to the present invention, the process of the first step (S1) to the ninth step (S9) relates to a method for producing a biodegradable molded article according to the present invention.

Example (1-3)

Biodegradable molded article manufacturing composition having a composition according to the invention was set to have a composition as shown in Table 1 below. In Examples 1 to 3 having the same composition as shown in Table 1 below, a plate-like material was manufactured using the method (S1 to S7) according to the above. On the other hand, it is apparent that the person skilled in the art can easily carry out the process according to the above description in the case of manufacturing the compression molded article by following the steps S8 and S9 using the resultant.

Classification (Content Unit: Weight%) Example One 2 3 A freight Natural powder 4.17 35 4.28 39 4.37 43 water 30.83 34.72 38.63 Vegetable starch powder 35 30 25 Vegetable fiber powder 30 31 32

Tensile strength, compressive strength, and elongation rate of the plate material manufactured using the composition according to Example 1 of the present invention were measured as follows, and the plate material of the paper material as a target of comparison is shown in Table 2 below.

Tensile strength and elongation in Table 2 were measured according to the Korean Industrial Standard (KSM 3006), respectively, and the compressive strength was measured using a universal testing machine (Intron 6027).

Evaluation item Plate-like material according to Example 1 Paper Plate (Comparative Example) Tensile Strength (㎏ / ㎠) 54.18 3.6 Compressive strength (㎏f) 196.53 14 Elongation (%) horizontal 0.99 - Vertical 2.4 -

As can be seen from Table 2, the tensile strength of the plate material according to Example 1 has a strong tensile strength of about 18 times compared to the paper plate material set in the comparative example, the compressive strength It can be seen that even 14 times stronger. On the other hand, in the case of the embodiment according to the present invention, although a small degree of elongation is present, it can be seen that the deformation is easily generated without tearing in the molding process in the future. On the other hand, in the case of manufacturing a molded article by the compression molding process, it is preferable in the manufacture of a molded article in that the ductility increases as the pre-heating of the prepared plate-like material increases, thereby increasing the elongation rate and can be accompanied by a suitable shape deformation.

Optimal embodiments of the present invention described above have been disclosed. Although specific terms have been used herein, they are used only for the purpose of describing the present invention in detail to those skilled in the art and are not intended to limit the scope of the present invention as defined in the claims or the claims.

According to the present invention, all of the components of the composition itself are materials that can be secured in nature, and by using no additives other than these materials, stable supply and demand of raw materials are possible, as well as the manufacturing process, and the conventional plastic Compared to the products, it is eco-friendly, harmless to human body, and has the advantage that price competitiveness can be sufficiently guaranteed.

Claims (20)

delete delete (S1) wheat, starch, rice, glutinous rice, potatoes, corn, tapioca and sweet potato selected from one or two or more natural material powder and water of 0 to 80 ℃ which is an amount of 1 to 15 times the weight of the natural material powder; First step; (S2) a second step of heating and modifying the mixture obtained in the first step while heating for 5 to 30 minutes at a temperature condition of 60 to 150 ℃ while stirring; (S3) vegetable starch powder and sugar cane, rice straw, barley straw, reed, wheat straw, corn stalk which are one or two or more ingredients powder selected from wheat, glutinous rice, rice, barley, corn, potato, sweet potato and tapioca Mixing the vegetable fiber powder, which is one or two or more material powders selected from coconut, grass, wild grass and cotton wool, each component of the composition consisting of the above-mentioned curd, vegetable starch powder and vegetable fiber powder Sequentially mixing at the same time or at the same time so as to be included in an amount of 1 to 50% by weight; And (S4) a fourth step of kneading to give viscoelasticity to the mixture obtained in the third step; biodegradable molded article manufacturing method for producing a biodegradable molded article comprising a. The method of claim 3, In the first step (S1) biodegradable molded article manufacturing method for producing a biodegradable molded article, characterized in that to produce a hoge further added 1 to 20% by weight of titanium dioxide relative to the weight of the natural material powder. (S5) a fifth step of rolling and rolling the dough for producing a biodegradable molded article prepared according to claim 3 or 4; (S6) a sixth step of drying the rolled result; And (S7) a seventh step of forming a coating layer on the upper surface of the dried result; biodegradable molded article manufacturing method for producing a molded product characterized in that it comprises a. The method of claim 5, In the drying process of the sixth step (S6), the biodegradable molded article for manufacturing, characterized in that the first drying section and the second drying section by separating the drying section and the heating method and heating temperature by sequentially heating and drying Method of manufacturing plate material. The method of claim 6, The first drying section is indirect heating method at a temperature condition of 50 to 130 ℃, the second drying section is a plate for producing a biodegradable molded article, characterized in that the direct heating method at a temperature condition of 50 to 140 ℃. Merchant manufacturing method. The method of claim 5, Method of producing a plate-like material for producing a biodegradable molded article, characterized in that further comprising a calendering process in the middle of the drying process of the sixth step (S6). The method of claim 5, The coating layer of the seventh step (S7) is a plate-like material manufacturing method for producing a biodegradable molded article, characterized in that formed by applying a wax-based coating agent. The method of claim 10, The wax-based coating agent, paraffin wax, microwax, synthetic wax and natural wax, any one or two or more of the coating agent selected from the above. The method of claim 5, The coating layer of the seventh step (S7), the plate-like material manufacturing method for producing a biodegradable molded article to be formed by attaching a functional film layer on the upper surface of the resultant of the sixth step (S6). The method of claim 11, The functional film layer is a plate-like material manufacturing method for producing a biodegradable molded article, characterized in that the film layer made of any one material selected from biodegradable material, photodegradable material, thermally decomposable material and engineering plastics. (S8) an eighth step of preheating the plate material prepared according to claim 5; And (S9) a biodegradable molded article manufacturing method characterized in that it comprises a; ninth step of compression molding the preheated plate-like material. The method of claim 14, The eighth step (S8), the biodegradable molded article manufacturing method characterized in that to proceed to have a temperature of 40 to 150 ℃. The method of claim 14, The ninth step (S9), the biodegradable molded article manufacturing method characterized in that the progress to the temperature conditions of 3 to 180 ℃ and pressure conditions of 20 to 350 kg / ㎠. delete delete delete delete delete

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