Process of fabricating upcycling paper articles using waste paper and composition for fabricating upcycling paper articles

Abstract

Upcycled paper products are manufactured and processed by immersing shredded or ground waste paper in a liquid component, such as liquid grain resin, and molding a composition obtained by blending the shredded or ground waste paper immersed in the liquid component with additives such as liquid acrylic resin and inorganic powder and / or pigments. This enables the manufacturing and processing of environmentally friendly upcycled paper products with improved physical properties such as workability, aesthetics, water resistance, and strength.

Description

Technology Field

[0001] The present invention relates to a method for utilizing waste paper, and more specifically, to a method for manufacturing upcycled paper products with improved workability and physical properties by utilizing waste paper, and to a composition for manufacturing paper products. Background Technology

[0003] As industrialization progresses globally, the volume of products manufactured in industrial facilities and consumed is rapidly increasing. Furthermore, the consumption of energy sources required to operate these facilities for production is also rising. As the volume of products manufactured and processed in industrial facilities and factories increases, the amount of natural resources available for use in natural ecosystems decreases.

[0004] Due to such industrialization, issues of climate change, such as global warming, and the depletion of natural resources are emerging as challenges that must be urgently resolved not only in Korea but also across the entire world. Recognizing these problems, Korea is also establishing legal and institutional mechanisms to recycle waste consumed in industrial facilities and households.

[0005] In Korea, waste paper generated from households and offices is separated, collected, and compressed for recycling. However, the waste paper recycling market is currently in disarray due to domestic paper companies refusing to accept waste paper of poor quality and falling prices. Notably, even China, which was the largest importer of waste paper, is seeing a decrease in imports. Therefore, methods must be explored to move beyond the simple recycling of domestically generated or imported waste paper and utilize it to create new value-added products.

[0006] For waste paper recycling in Korea, the following processes are utilized: a dissociation process that breaks waste paper into small fiber particles by mixing it with water and chemicals; a sorting process that removes fine impurities (ink, adhesives) that have not been dissociated; a concentration process that imparts special functions to the raw material (controlling raw material concentration) by adding organic / inorganic chemical dyes; and a refining process that grinds the raw material to make it flexible.

[0007] However, recycling waste paper alone is not sufficient to utilize waste paper generated in homes or offices. Therefore, there is an increasing need for methods to mold and manufacture so-called upcycling products—which go beyond simple recycling of waste paper generated in homes or offices and transform it into products with new value by redesigning or changing the method of use—and to develop upcycling products through this process. Prior art literature

[0009] Republic of Korea Registered Patent No. 10-1740656 (Registered on May 26, 2017) The problem to be solved

[0010] The present invention is proposed to resolve the aforementioned conventional problems, and the objective of the present invention is to provide a method for manufacturing paper products capable of upcycling beyond simple recycling by utilizing waste paper, a composition for manufacturing paper products containing waste paper, and paper products containing waste paper.

[0011] Another objective of the present invention is to provide a method for manufacturing a paper product utilizing waste paper with improved workability in manufacturing and processing processes, a composition for manufacturing a paper product comprising waste paper, and a paper product comprising waste paper.

[0012] Another objective of the present invention is to provide a method for manufacturing a paper product using waste paper with improved aesthetic properties as well as physical properties such as water resistance and strength, a composition for manufacturing a paper product containing waste paper, and a paper product containing waste paper.

[0013] Finally, the present invention aims to provide a method for manufacturing paper products utilizing waste paper using an eco-friendly material, a composition for manufacturing paper products containing waste paper, and a paper product containing waste paper. means of solving the problem

[0015] According to one aspect of the present invention having the above objective, the present invention provides a method for manufacturing a paper product using waste paper, comprising the steps of: immersing shredded or ground waste paper in a liquid resin component comprising a liquid grain resin, wherein the shredded or ground waste paper is immersed in the liquid resin component at a ratio of 200 to 300 parts by weight of the liquid resin component to 100 parts by weight of the shredded or ground waste paper; obtaining a first composition by mixing an additive selected from a liquid acrylic resin; an inorganic powder, a pigment, and a combination thereof; obtaining a second composition by mixing the first composition with the liquid resin in which the shredded or ground waste paper is immersed, wherein the content of the liquid grain resin in the second composition, which is composed of the liquid acrylic resin and the liquid resin, is 25 to 40% by weight; and molding the second composition.

[0016] In another embodiment, in the immersion step, the liquid resin component may further include a liquid acrylic resin.

[0017] In the step of obtaining the second composition, the second composition may be formulated such that the content of the liquid grain resin in the total liquid component, which includes the liquid acrylic resin and the liquid grain resin, is 25 to 35 weight percent.

[0018] In one embodiment, the liquid grain resin may include liquid grain starch.

[0019] In the step of obtaining the second composition, the above can be mixed in a ratio of 3 to 6 parts by weight of the crushed or ground waste paper, 6 to 15 parts by weight of the liquid grain resin, 20 to 30 parts by weight of the liquid acrylic resin, and 55 to 65 parts by weight of the additive.

[0020] In another embodiment, in the step of obtaining the second composition, the mixture may be formulated in a ratio of 4 to 5 parts by weight of the crushed or ground waste paper, 9 to 13 parts by weight of the liquid grain resin, 24 to 28 parts by weight of the liquid acrylic resin, and 58 to 62 parts by weight of the additive.

[0021] The above forming step may include a mold forming step.

[0022] In another aspect, the present invention provides a composition for manufacturing a paper product using waste paper, comprising 3 to 6 parts by weight of shredded or ground waste paper, 6 to 15 parts by weight of liquid grain resin, 20 to 30 parts by weight of liquid acrylic resin, and 55 to 50 parts by weight of an additive selected from inorganic powder, pigments, and combinations thereof.

[0023] As an example, the inorganic powder may include mineral powder.

[0024] In another aspect, the present invention provides a paper product using waste paper manufactured using the method described above. Effects of the invention

[0026] In the present invention, collected waste paper is immersed in a liquid component containing a liquid grain resin, and a first composition comprising a liquid acrylic resin and an additive is mixed with the crushed or ground waste paper immersed in the liquid component, and then molded.

[0027] According to the present invention, paper products capable of upcycling can be manufactured and processed beyond simple recycling of waste paper.

[0028] In addition, the workability of the manufacturing and / or processing steps is improved, and paper products with excellent water resistance, strength, and aesthetic properties can be manufactured.

[0029] Furthermore, by immersing waste paper in a liquid component containing liquid grain resin, it is possible to manufacture upcycled paper products having a soft, matte appearance.

[0030] Furthermore, by applying natural grain resin when manufacturing paper products from waste paper, an eco-friendly process can be implemented, enabling the production of eco-friendly upcycled paper products.

[0031] It is expected that by applying the present invention, upcycled paper products with various shapes, ranging from small everyday items to large-sized boards, can be produced and utilized, possessing physical properties such as strength and water resistance suitable for interior materials. Brief explanation of the drawing

[0033] FIG. 1 is a flowchart schematically illustrating a process for manufacturing upcycled paper products using waste paper according to an exemplary embodiment of the present invention. FIG. 2 is a graph showing the results of evaluating workability when manufacturing paper products according to the content of waste paper and liquid resin when waste paper is immersed in liquid resin, according to an exemplary embodiment of the present invention. FIG. 3 is a graph showing the results of evaluating the aesthetics, water resistance, strength, and workability in the manufacturing process of a paper product according to the content of grain resin relative to the total liquid components included in the composition before molding, according to an exemplary embodiment of the present invention. FIGS. 4a to 4e are photographs showing the state of a paper product manufactured according to an exemplary embodiment of the present invention. Figures 5a to 5e are photographs showing the condition of paper products manufactured according to comparative examples, respectively. Specific details for implementing the invention

[0034] The present invention will be described in detail below through drawings attached where necessary.

[0035] The present invention relates to a method for manufacturing and processing environmentally friendly upcycled paper products with improved design, function, and workability by utilizing waste paper that is currently not being fully utilized, a composition for manufacturing upcycled paper products containing waste paper, and upcycled paper products containing waste paper.

[0036] FIG. 1 is a flowchart schematically illustrating a process for manufacturing upcycled paper products using waste paper according to an exemplary embodiment of the present invention.

[0037] As schematically illustrated in FIG. 1, a process for manufacturing paper products using waste paper may include a step of collecting and classifying waste paper (step S110), a step of processing the collected and classified waste paper into a shredded or ground form (step S120), a step of immersing the shredded or ground waste paper in a liquid resin containing grain resin (step S130), a step of obtaining a primary composition by mixing acrylic resin and additives (step S140), a step of obtaining a secondary composition by mixing the waste paper immersed in the liquid resin with the aforementioned primary composition (step S150), and a step of molding and / or processing the secondary composition (step S160).

[0038] Below, each process and step of manufacturing upcycled paper products using waste paper is explained in more detail.

[0040] [Waste Collection / Classification Stage]

[0041] First, waste paper that can be utilized for upcycling paper products is collected and classified (Step S110). Waste paper can be collected from waste treatment companies; specifically, waste paper can be collected through companies engaged in waste collection and transportation, etc., based on the waste treatment company status information from the Korea Waste Association.

[0042] Next, the collected waste paper is classified. In one exemplary embodiment, the collected waste paper may be classified according to whether or not it is coated, but is not limited thereto.

[0043] In one embodiment, in the case of uncoated waste paper, the ink dissolves during the processing, and a paper product with a background color can be obtained from the final manufactured paper product.

[0044] In addition, the thinner and more susceptible the waste paper is to moisture, or the longer it is immersed and exposed to liquid resin, the more the fibers of the waste paper are shredded and split during the processing, resulting in a natural pattern.

[0045] On the other hand, when coated waste paper is immersed for a short period in the liquid resin described below, the final paper product can be produced without the background color being stained, resulting in a white product, and can be produced and realized as a final paper product with a shape that maintains the original square paper shape and is not split.

[0047] [Waste Paper Processing Stage]

[0048] The collected and classified waste paper is processed into shredded or ground waste paper before being mixed or immersed with the liquid components described below (Step S120). In an exemplary embodiment, the waste paper processing process (Step S120) may include a first processing step in which the collected and classified waste paper is placed into a shredder and ground, and a second processing step in which the shredded waste paper processed in the first step is placed into a mixer or the like and ground. In one embodiment, through the second processing step, the waste paper may be ground to a size of 100 to 400 mesh or 20 to 100 mesh, but is not limited thereto.

[0049] Depending on the type and characteristics of the collected and classified waste paper, the processing step may be performed under different conditions. In one embodiment, shredded waste paper processed in the first stage using a shredder comes out uniformly in the shape of a rod. Therefore, the paper product obtained using the shredded waste paper to which the first stage processing was applied has a slightly hard appearance on the surface of the product.

[0050] On the other hand, when primary and secondary processing are applied, the paper layers that were attached in multiple layers are separated, increasing in volume, and the edge surfaces are ground, allowing for a more natural crushed shape.

[0051] In one exemplary embodiment, when the collected and classified waste paper has a width and length of about 15 cm or more, for example, a width and length of about 20 cm or more, a bar-shaped pattern may stand out, so it can be shredded by primary processing alone.

[0052] On the other hand, if the collected and classified waste paper has a width and length of less than approximately 15 cm, for example, a width and length of less than approximately 20 cm, it undergoes secondary processing after primary processing to be processed into shredded waste paper. Accordingly, upcycled paper products having various aesthetic shapes and patterns can be molded and produced by expressing the shredded and broken waste paper pattern. However, whether primary and secondary processing are performed is not limited to the size of the aforementioned waste paper.

[0053] [Step of immersing waste paper in liquid resin]

[0054] The shredded or ground waste paper obtained through processing is immersed in a liquid resin containing a liquid grain resin (step S130). The liquid acrylic resin has a sticky texture like glue, and when immersing the shredded or ground waste paper, if a sufficient amount of liquid acrylic resin is not used, the waste paper sticks together and clumps.

[0055] When shredded or ground waste paper obtained through processing is immersed in a synthetic resin other than liquid grain resin, such as an acrylic resin, the shrinkage of the acrylic resin covering the waste paper causes an embossing effect to form on the final paper product instead of a flat surface, resulting in an indented engraving phenomenon.

[0056] In addition, when shredded or ground waste paper is immersed in liquid acrylic resin and then an additive such as inorganic powder is mixed and stirred with the shredded or ground waste paper immersed in acrylic resin, a problem arises in that the inorganic powder has difficulty finely breaking up the clumped parts of the waste paper due to the waste paper.

[0057] Furthermore, when processed waste paper is directly mixed into a paste containing additives such as the liquid acrylic resin and inorganic powder described later, a problem arises where the waste paper clumps together.

[0058] In addition, when using acrylic resin sufficient to fully immerse shredded or ground waste paper, the overall consistency of the paste becomes thin, leading to the formation of many bubbles and requiring a long curing time, which results in reduced workability and process productivity.

[0059] On the other hand, when using an acrylic resin sufficient to fully immerse shredded or ground waste paper, the problem of the paper clumping occurs. Therefore, when shredded or ground waste paper is immersed in liquid acrylic resin, it is difficult to produce paper products that satisfy both workability and aesthetics.

[0060] Meanwhile, when shredded or ground waste paper is immersed in water and then mixed with a paste containing acrylic resin and additives, a large amount of air bubbles may be generated during the manufacturing process and the paste may become thin due to the water, making it difficult to mold into a paper product with desired physical properties.

[0061] In contrast, in the present invention, shredded or ground waste paper obtained by processing is immersed in a separate liquid component, and then mixed into a paste containing liquid acrylic resin and additives. The liquid component into which the shredded or ground waste paper is immersed comprises at least a liquid grain resin component.

[0062] When shredded or ground waste paper obtained through the waste paper processing process (step S120) is immersed in a liquid component containing liquid grain resin, stirring is possible without the waste paper clumping together, with almost no effect on the consistency of the paste. In other words, when manufacturing upcycled paper products, workability can be greatly improved by first immersing shredded or ground waste paper in a liquid component containing liquid grain resin.

[0063] In addition, by utilizing natural-derived liquid components, such as liquid grain resin, rather than synthetic resins like liquid acrylic resin, it is possible to manufacture upcycled paper products using waste paper in an environmentally friendly manner.

[0064] In one exemplary embodiment, in the process of immersing waste paper in a liquid component (step S130), the waste paper may be immersed in a ratio of 200 to 300 parts by weight of a liquid resin component to 100 parts by weight of shredded or ground waste paper obtained by processing. In other words, when immersing shredded or ground waste paper in the liquid component, the shredded or ground waste paper and the liquid component may be mixed in a weight ratio of 1:2 to 1:3, but the present invention is not limited thereto. Meanwhile, unless otherwise stated in this specification, the term "part by weight" refers to the weight ratio between the components being mixed.

[0065] In one exemplary embodiment, the liquid resin may be a water-based resin, such as a water-based grain resin. Unlike liquid acrylic resin, the liquid grain resin has a non-sticky and smooth texture and has the property of being less permeable to the waste paper and remaining as a coating on the surface of the waste paper. Even when using a relatively small amount of liquid grain resin compared to acrylic resin, it is possible to prevent the waste paper from clumping together simply by immersing the surface area of ​​the shredded or ground waste paper.

[0066] Unlike acrylic resin, liquid grain resin has low adhesion to processed waste paper, which can lead to defects where paper attached to the surface swells and detaches. Therefore, when immersing waste paper using only liquid grain resin, it is necessary to avoid immersing the paper in the resin for extended periods.

[0067] In addition, since uncoated waste paper is more prone to soaking than coated waste paper, the soaking time may be applied differently depending on the type of collected and classified waste paper. The defect rate can be reduced as the waste paper is separated into thinner layers through secondary processing in the waste paper processing step (step S120).

[0068] In another embodiment, the liquid resin may include other liquid resins that are water-based in addition to the water-based grain resin, such as liquid (e.g., water-based) acrylic resin. When waste paper is immersed in a liquid component containing liquid acrylic resin in addition to the liquid grain resin, the additionally added liquid acrylic resin adheres closely to the waste paper, thereby improving the workability of the process and the physical properties of the final paper product.

[0069] In this case, the product defect rate can be reduced by adjusting the stirring conditions so that the liquid acrylic resin paste is uniformly well mixed with the waste paper. Additionally, by applying a translucent liquid acrylic resin, it may be suitable for visually expressing patterns or designs of shredded or ground waste paper.

[0070] In one embodiment, the liquid grain resin used to immerse shredded or ground waste paper may be liquid grain starch. Various types of starch may be used as the liquid grain starch, and may be selected from the group consisting of, for example, rice starch, corn starch, potato starch, wheat starch, Takao starch, and combinations thereof, but is not limited thereto. In an exemplary embodiment, the liquid grain resin may include, but is not limited to, rice starch as a solid component, water as a liquid component, and salt acting as a preservative.

[0072] [Obtaining the first composition by combining acrylic resin and additives]

[0073] A first composition is obtained by mixing an acrylic resin and an additive separately from the process of immersing shredded or ground waste paper in a liquid resin component containing a liquid grain resin (step S130). If the liquid component contains only the liquid grain resin in which the shredded or ground waste paper is immersed, it may take a long time to dry the liquid component and the aesthetic properties may be degraded when expressing the pattern or design of the shredded or ground waste paper.

[0074] In addition, if only liquid acrylic resin is included as the liquid component, the additive may not be uniformly dispersed within the liquid component and may clump together. On the other hand, in the present invention, liquid grain resin is immersed in crushed or ground waste paper as the primary liquid component, and then liquid acrylic resin is mixed as the secondary liquid component so that the additive can be uniformly dispersed within the liquid component and upcycled paper products with various textures can be manufactured.

[0075] In an exemplary embodiment, the liquid acrylic resin included in the first composition may be an alkyl-substituted aqueous acrylic resin. As an example, the aqueous acrylic resin may be a ternary copolymer in which three types of acrylic monomers, namely methylmethacrylate (MMA), butylacrylate, and 2-ethylhexylacrylate (2-EHA), constitute a unit, or three types of aqueous acrylic resins synthesized from each of these acrylic monomers.

[0076] For example, among aqueous acrylic resins, it may include 40 to 50 parts by weight of an MMA-derived component, 5 to 10 parts by weight of a butyl acrylate-derived component, and 5 to 10 parts by weight of a 2-EHA-derived component, but is not limited thereto.

[0077] In another embodiment, the liquid acrylic resin may be a modified acrylic resin. For example, the liquid acrylic resin may contain acrylic powder and water. For example, the acrylic powder may contain an acrylamide and sodium acrylate copolymer, but is not limited thereto.

[0078] Meanwhile, in addition to the liquid acrylic resin, the first composition may include an additive selected from the group consisting of inorganic powder, a pigment which may be an acrylic pigment, and combinations thereof. For example, as an example of an additive included in the first composition, the inorganic powder may function as a filler. The inorganic powder may include mineral powder, and for example, the mineral powder may be selected from the group consisting of kaolin, wollastonite, metal oxide powder, metal salt particles, metal salt hydrate particles, non-metallic inorganic oxide powder, and combinations thereof, but is not limited thereto.

[0079] For example, mineral powder may include, but is not limited to, metal oxide powders such as kaolin and alumina (Al2O3), and non-metal inorganic oxide powders such as selenite (CaSO4·2H2O) and silica (SiO2). Additionally, as another example of an additive, pigments may include, but are not limited to, acrylic paints.

[0080] In one embodiment, the liquid acrylic resin and the additive in the first composition may be mixed in a weight ratio of 1:2 to 1:4, for example, 1:2.5 to 1:3.5, but are not limited thereto. The first composition mixed with the liquid acrylic resin and the additive may be stirred.

[0082] [Obtaining a second composition by combining waste paper / liquid resin and the first composition]

[0083] A primary composition is obtained by mixing crushed or ground waste paper immersed in a liquid component containing a liquid grain resin with a liquid acrylic resin and an additive to obtain a secondary composition (Step S150). Prior to the molding step (Step S160) described later, the secondary composition can be stirred to be converted into a dough-like secondary composition.

[0084] The secondary composition prior to molding includes a liquid acrylic resin as a liquid component, in addition to the aforementioned liquid grain resin. The translucent liquid acrylic resin, suitable for visually expressing patterns of shredded or ground waste paper, undergoes initial setting within one hour when used alone with inorganic powder; however, since the inorganic powder tends to clump, it must be stirred thoroughly. By utilizing the secondary composition containing the liquid acrylic resin, a glossy appearance can be achieved on the surface of the final paper product, appearing as if it were smoothly coated.

[0085] In addition, the drying time can be shortened by including liquid acrylic resin in addition to liquid grain resin, which requires a long drying time as a liquid component. Furthermore, by including liquid grain resin, additives such as inorganic powder can be uniformly dispersed within the liquid component without clumping, and the surface of the paper product can be realized in a matte form.

[0086] Furthermore, when used in combination with liquid acrylic components, it can prevent crushed or ground waste paper from clumping together without significantly affecting the concentration of the paste-type secondary composition.

[0087] In one exemplary embodiment, among the liquid components of the second composition consisting of a liquid acrylic resin and a liquid resin, the content of the liquid grain resin is 25 to 40 weight%, for example, 25 to 35 weight% or 25 to 30 weight%, and the content of the liquid acrylic resin is 60 to 75 weight%, for example, 65 to 75 weight% or 70 to 75 weight%, but is not limited thereto. By adjusting the content of the liquid components in the second composition in this way, an upcycled paper product with improved physical properties and aesthetic characteristics, such as workability, strength, and water resistance, can be manufactured.

[0088] In another embodiment, the second composition may comprise 3 to 6 parts by weight of crushed or ground waste paper, e.g., 4 to 5 parts by weight; 6 to 15 parts by weight of liquid grain resin, e.g., 9 to 13 parts by weight; 20 to 30 parts by weight of liquid acrylic resin, e.g., 24 to 28 parts by weight; and 55 to 65 parts by weight of an additive selected from inorganic powder, acrylic pigments, and combinations thereof, e.g., 58 to 62 parts by weight.

[0089] When the content of shredded or ground waste paper, liquid grain resin, liquid acrylic resin, and additives satisfies the aforementioned range, the workability of the process is significantly improved, and upcycled paper products with excellent physical and aesthetic properties can be manufactured and processed.

[0090] The second composition, which is a mixture of crushed or ground waste paper, liquid grain resin, liquid acrylic resin, and additives, can be transformed into a second composition in a dough-like state by stirring using a sieve and a stirrer.

[0092] [Molding / Processing of Secondary Composition]

[0093] The second composition in the form of dough is molded and processed (step S160) to finally mold and manufacture an upcycled paper product. In an exemplary embodiment, when molding the second composition, a mold molding process may be applied to process it into an upcycled paper product, but is not limited thereto.

[0094] In one embodiment, mold forming can be performed in the following manner. First, the second composition in a paste state is applied to the mold using a brush or the like to prevent surface bubbles. Next, the second composition in a paste state is poured into the mold, and internal bubbles are expelled using a vibrator. A transparent film is placed over the paste and rubbed evenly to remove bubbles and waste paper trapped in the edges of the mold. Once the surface is cured, the film is removed, the mold is demolded and dried, and the edges are sanded smoothly to finish. For example, drying can be performed at room temperature or using hot air drying.

[0095] According to the present invention, a method for manufacturing upcycled paper products using waste paper with improved physical properties and aesthetics, and significantly improved process workability, is provided, and an upcycled paper product is realized. Environmentally friendly upcycled paper products can be manufactured and processed by utilizing natural resources such as grain resin.

[0096] The upcycled paper product manufactured according to the present invention is similar to or superior to a brick in terms of strength. Furthermore, the upcycled paper product manufactured according to the present invention does not contain components harmful to the human body, such as asbestos, lead (Pb), cadmium (Cd), and mercury (Hg). Ultimately, through the present invention, it becomes possible to manufacture an environmentally friendly upcycled paper product that not only enhances aesthetics by clearly realizing various waste paper patterns and possesses excellent strength, but also does not contain components harmful to the human body.

[0097] The present invention will be explained below through exemplary embodiments, but the present invention is not limited to the technical concept described in the following embodiments.

[0099] [Experimental Example 1] Workability According to Ingredient Mixing Ratio · Evaluation of physical properties and aesthetics

[0100] The consistency of the paste, which consists of shredded or ground waste paper and additives dispersed in a liquid component, is critical. If the paste is too thin, numerous small air bubbles rise to the surface, degrading the aesthetics of the final paper product and prolonging the time required for initial setting. Conversely, if the paste is too thick, it becomes difficult to control the amount of paste dispensed into the mold during the molding process, leading to reduced workability. Furthermore, even when using a vibrator, hidden air bubbles cannot be expelled and become trapped on the surface, resulting in product defects. Additionally, this accelerated curing time acts as a disadvantage in cases requiring extensive processing time.

[0101] In addition, regarding the workability of the secondary composition, 1) the time required from immediately after molding until demolding is possible must be 2 hours or less, 2) the mixing process of each material must be easy, and 3) the concentration of the mixed resin must be suitable for work.

[0102] First, workability was evaluated based on the weight ratio between shredded or ground waste paper and liquid grain resin. The evaluation results are shown in Fig. 2. As shown in Fig. 2, when the mixing weight ratio of shredded or ground waste paper and liquid grain resin (rice starch) was 1:1, the amount of liquid grain resin was insufficient to completely immerse the surface of the shredded or ground waste paper. Consequently, when the shredded or ground waste paper was placed into a paste mixed with liquid acrylic resin and inorganic powder, clumping of the shredded or ground waste paper occurred. As a result, the amount of shredded or ground waste paper exposed on the surface of the final paper product was reduced.

[0103] On the other hand, when the mixing weight ratio between shredded or ground waste paper and liquid grain resin is 1:4 or higher, for example 1:5 or higher, the liquid grain resin component remains even after the entire surface of the shredded or ground waste paper is immersed. Consequently, an unnecessary liquid component is added in excess to the dough, which is a secondary composition, causing the consistency of the dough to become diluted and reducing workability.

[0104] However, when the mixing weight ratio between shredded or ground waste paper and liquid grain resin is 1:2 to 1:3, that is, when the content of liquid grain resin is 200 to 300 parts by weight based on 100 parts by weight of shredded or ground waste paper, the entire surface of the shredded or ground waste paper can be immersed, and the concentration of the paste, which is the final composition, is also maintained appropriately, thereby improving workability.

[0105] Meanwhile, regarding the aesthetics of upcycled paper products, 1) the pattern of shredded or ground waste paper must be clearly visible on the surface of the product, 2) there must be no bubbles or holes, and 3) there must be no pitting or detachment on the surface of the paper product.

[0106] Regarding the water resistance of paper products, 1) they must not absorb water, or even if they do, the durability of the paper product must not be affected, and 2) water must not stain the surface of the product or alter its appearance.

[0107] Regarding the strength of paper products, 1) they must meet the strength required for use after complete drying, 2) they must not be easily broken by an adult using normal force without the use of tools, and 3) they must not be damaged by light friction.

[0108] To test the water resistance of upcycled paper products, the paper products were immersed in a container of water for 24 hours, and it was evaluated whether components dissolved in the water or if the shape of the products changed.

[0109] The aesthetics, workability, water resistance, and strength of paper products manufactured by setting different amounts of liquid grain resin and liquid acrylic resin among the liquid components were evaluated. It was found that when the amount of liquid grain resin among the liquid components was 20 to 40 parts by weight, particularly 20 to 35 parts by weight, physical properties such as water resistance and strength, as well as aesthetics and workability, were improved.

[0110] More specifically, when the liquid component contained 0% by weight of liquid grain resin and 100% by weight of liquid acrylic resin, the crushed waste was clumped together or there was difficulty in stirring the inorganic powder, resulting in reduced workability. However, although the water resistance and strength were excellent due to the high water resistance of the acrylic resin, the paste attached to the surface shrank after drying, causing an indentation phenomenon.

[0111] Meanwhile, when the liquid components contain 15% by weight of liquid grain resin and 85% by weight of liquid acrylic resin, the 15% by weight of grain resin alone may not be sufficient to immerse shredded or ground waste paper. Therefore, shredded or ground waste paper was immersed in a liquid component composed of 15% by weight of grain resin and 15% by weight of acrylic resin based on the total liquid components, and the remaining 70% by weight of acrylic resin was mixed with additives to form a paste. Compared to when only pure liquid acrylic resin was applied, water resistance and strength were reduced, while aesthetics and workability were slightly improved.

[0112] In addition, when the liquid components were formulated with 50% by weight of liquid grain resin and 50% by weight of liquid acrylic resin, as the grain resin content increased, the consistency of the paste became thinner and the clumping of inorganic powder decreased, but the time required for initial setting increased, and the strength and water resistance of the product after full curing were significantly reduced. Furthermore, due to the opacity of the liquid grain resin, the pattern of the waste paper was largely obscured, and the aesthetics were also reduced.

[0113] When the liquid component consists solely of 100% liquid grain resin, the paste feels thick, like touching wet sand paste, rather than melting with inorganic powder. Although the waste paper does not clump together, a white matte surface appears after complete drying, and the waste paper pattern is mostly obscured. It breaks easily with an adult's hand and absorbs excessive water, resulting in reduced water resistance.

[0114] On the other hand, when the liquid component contains 25 to 40 weight percent of liquid grain resin and 60 to 75 weight percent of liquid acrylic resin, the workability is greatly improved as the liquid grain resin is thoroughly mixed with the shredded or ground waste paper, allowing the shredded or ground waste paper to be sufficiently immersed. When the amount of shredded or ground waste paper is increased, a pattern unique to shredded or ground waste paper is expressed on the surface of the paper product, and the aesthetics are greatly improved.

[0115] In addition, a paper product molded from a paste containing 25 to 40 weight percent of liquid grain resin in the liquid components did not melt or break when immersed in water for 24 hours. Furthermore, after the paper product was completely dried, it did not break easily, and its living strength was sufficiently satisfactory.

[0117] [Example 1] Molding of paper products using waste paper · manufacturing

[0118] Upcycled paper products were manufactured as follows from a second composition in the form of a paste, in which the content of grain resin among the total liquid components was 30% by weight. Waste paper purchased from the market was placed in a shredder for primary processing. 50g (4 parts by weight) of the processed waste paper was immersed in liquid grain resin (102g of rice starch, 20% by weight of the total liquid components) to obtain Material No. 1. 865g (61 parts by weight) of mineral powder was first stirred in a solution prepared by mixing 357g (25 parts by weight, 70% by weight of the total liquid components) of liquid acrylic resin and 51g of liquid grain resin (11 parts by weight of the total secondary composition, 10% by weight of the total liquid components if the grain resin used for immersing the waste paper is included), and then Material No. 1 obtained above was added and stirred to form a paste. Upcycled paper products were manufactured and processed by mold molding using the paste in the following manner.

[0119] First, the second composition in paste form was applied to the mold using a brush to prevent surface bubbles. Next, the second composition in paste form was poured into the mold, and internal bubbles were expelled using a vibrator. A transparent film was placed over the paste and rubbed evenly to remove bubbles and waste paper stuck in the edges of the mold. Once the surface hardened, the film was removed, the mold was demolded and dried, and the edges were sanded smoothly to finish. An upcycled paper product with improved workability and reduced bubble formation during processing was manufactured (Fig. 4a).

[0121] [Example 2] Molding of paper products using waste paper · manufacturing

[0122] An upcycled paper product was prepared as follows from a second composition in the form of a paste, in which the grain resin content was 30% by weight of the total liquid components. 75g (5 parts by weight) of shredded or ground waste paper was immersed in 153g (11 parts by weight, 30% by weight based on the total liquid components) of grain resin to obtain Material No. 1. 357g (25 parts by weight, 70% by weight based on the liquid components) of liquid acrylic resin and 865g (60 parts by weight) of mineral powder were pre-stirred, and then Material No. 1 was added and stirred. Subsequently, mold molding was performed in the same manner as in Example 1. The waste paper pattern was highly expressed even immediately after demolding, and the waste paper pattern was maintained even after drying, thereby improving aesthetics (Fig. 4a).

[0124] [Example 3] Molding of paper products using waste paper · manufacturing

[0125] An upcycled paper product was prepared as follows from a second composition in the form of a paste, in which the grain resin content was 40% by weight of the total liquid components. 75g (5 parts by weight) of shredded or ground waste paper was immersed in 204g (14 parts by weight, 40% by weight based on the total liquid components) of grain resin to obtain Material No. 1. 306g (21 parts by weight, 60% by weight based on the liquid components) of liquid acrylic resin, 865g (60 parts by weight) of acrylic paint and mineral powder were pre-stirred, and then Material No. 1 was added and stirred. Subsequently, molding was performed in the same manner as in Example 1. Compared to Comparative Example 17 described later, immersing waste paper in grain resin rather than using water prevented the waste paper from clumping and made the process easier. Since the waste paper did not break in the acrylic resin, smooth color expression was possible (Fig. 4a).

[0127] [Example 4] Molding of paper products using waste paper · manufacturing

[0128] An upcycled paper product was prepared as follows from a second composition in the form of a paste, in which the grain resin content of the total liquid components was 30% by weight. 140g (5 parts by weight) of shredded or ground waste paper was immersed in 306g (11 parts by weight, 30% by weight based on the total liquid components) of liquid grain resin to obtain Material No. 1. 714g (25 parts by weight, 70% by weight based on the liquid components) of liquid acrylic resin, 1730g (60 parts by weight) of acrylic paint and mineral powder were pre-stirred, and then Material No. 1 was added and stirred. Subsequently, mold molding was performed in the same manner as in Example 1. It was confirmed that a waste paper pattern was formed immediately after demolding (Fig. 4a).

[0130] [Example 5] Molding of paper products using waste paper · manufacturing

[0131] An upcycled paper product was prepared as follows from a second composition in the form of a paste, in which the grain resin content was 30% by weight of the total liquid components. 150g (5 parts by weight) of shredded or ground waste paper was immersed in 306g (11 parts by weight, 30% by weight based on the total liquid components) of liquid grain resin to obtain Material No. 1. 714g (25 parts by weight, 70% by weight based on the liquid components) of liquid acrylic resin, 8g of acrylic paint, and 1730g (60 parts by weight) of mineral powder were pre-stirred, and then Material No. 1 was added and stirred. Subsequently, molding was performed in the same manner as in Example 1. As the paste consistency was appropriate and the operation was performed with proficiency, the amount of material loss decreased, and workability was improved with a processing time of approximately 30 minutes. A waste paper pattern was visible immediately after demolding, and the waste paper pattern remained even after 24 hours (Fig. 4b).

[0133] [Example 6] Molding of paper products using waste paper · manufacturing

[0134] An upcycled paper product was prepared from a second composition in the form of a paste, in which the content of grain resin among the total liquid components was 30 wt%. The procedure of Example 5 was repeated except that the content of acrylic paint was changed to 9 g. A waste paper pattern was visible immediately after demolding, and the waste paper pattern remained even after 24 hours (Fig. 4b).

[0135] [Example 7] Molding of paper products using waste paper · manufacturing

[0136] An upcycled paper product was manufactured from a second composition in the form of a paste, in which the content of grain resin among the total liquid components was 30 wt%. The procedure of Example 5 was repeated, except that the type of processed waste paper was changed to double-sided paper and thin paper, and the content of acrylic paint was changed to 6 g. A waste paper pattern was visible immediately after demolding, and the waste paper pattern remained even after 24 hours (Fig. 4c).

[0138] [Example 8] Molding of paper products using waste paper · manufacturing

[0139] An upcycled paper product was prepared as follows from a second composition in the form of a paste, in which the content of grain resin among the total liquid components was 30 wt%. The procedure of Example 7 was repeated except that the content of acrylic paint was changed to 7 g. A waste paper pattern was visible immediately after demolding, and the waste paper pattern remained even after 24 hours (Fig. 4c).

[0141] [Example 9] Molding of paper products using waste paper · manufacturing

[0142] An upcycled paper product was manufactured from a second composition in the form of a paste, in which the content of grain resin among the total liquid components was 30% by weight. The procedure of Example 8 was repeated except that the content of mineral powder was changed to 1600g (accordingly, the content of acrylic resin in the second composition was 26 parts by weight and the content of mineral powder was 58 parts by weight). A paper product with a waste paper pattern exposed can be molded (Fig. 4d).

[0144] [Example 10] Molding of paper products using waste paper · manufacturing

[0145] An upcycled paper product was manufactured from a second composition in the form of a paste, in which the content of grain resin among the total liquid components was 30% by weight. After the first processing, the waste paper was ground in a mixer for a second processing step. 120g (4 parts by weight) of shredded or ground waste paper obtained by the second processing was immersed in 310g (11 parts by weight, 30% by weight based on the total liquid components) of liquid grain resin to obtain Material No. 1. 1600g (58 parts by weight) of mineral powder and 7g of yellow, 8g of green, and 5g of blue acrylic paints were each mixed into 710g (26 parts by weight, 70% by weight based on the liquid components) of liquid acrylic resin and stirred, after which Material No. 1 was added and stirred. Subsequently, mold molding was performed in the same manner as in Example 1.

[0146] As shredded or ground waste paper is used for secondary processing, the surface of the paper product, which is expressed in a uniform rectangular pattern, is transformed into a natural shredded paper appearance. When waste paper is processed for secondary processing, the volume of the waste paper increases, so the overall amount of the waste paper pattern does not decrease even if the amount of waste paper is reduced. In addition, by reducing the immersion time of the processed waste paper in the grain resin, the phenomenon of the multi-layered waste paper sticking to moisture and falling off can be prevented (Fig. 4e).

[0148] [Experimental Example 2] Physical properties of paper products and detection of components harmful to the human body

[0149] The strength of the paper product manufactured in Example 10 was measured, and whether it contained substances harmful to the human body was evaluated. The paper product manufactured in Example 10 was measured according to the KS F 4004: 2013 standard. For comparison, the strength of Type 1 bricks for load-bearing structures and Type 2 bricks for non-load-bearing structures was also measured. When measured according to the KS F 4004: 2013 standard, the compressive strength of the paper product manufactured in the example was 11 N / mm² 2 It was.

[0150] On the other hand, the compressive strength of Type 1 brick is 13 N / mm 2 The compressive strength of Type 2 bricks is 8 N / mm 2 The strength of the paper product manufactured according to the embodiment was similar to or superior to that of a brick. Therefore, it was confirmed that an upcycled paper product with very excellent strength can be realized through the present invention.

[0151] Whether the paper products manufactured in the examples contained components harmful to the human body was also measured. The asbestos content (%) in the upcycled paper products was measured according to the KS L 5300: 2009 standard. Chrysotile, brown asbestos, blue asbestos, tremolite asbestos, ecynolite asbestos, and anthophyllite asbestos were not detected in the paper products manufactured in the examples. In addition, the lead (Pb) content (mg / kg), cadmium (Cd) content (mg / kg), and mercury content (mg / kg) in the upcycled paper products were measured according to the EPA 3051A and 6010D (applied) standards, respectively. Pb, Cd, and Hg were not detected in the paper products manufactured in the examples. Therefore, it was confirmed that through the present invention, it is possible to manufacture upcycled paper products that do not contain components harmful to the human body, are environmentally friendly, and are work-friendly.

[0153] [Comparative Example 1] Molding of paper products using waste paper · manufacturing

[0154] A paper product was manufactured from a paste-like composition in which the grain resin content was 51% by weight of the total liquid components. Material No. 1 was obtained by immersing 20g (3 parts by weight) of primary processed waste paper in 120g (20 parts by weight, 51% by weight based on the total liquid components) of liquid grain resin. 116g (20 parts by weight, 49% by weight based on the liquid components) of acrylic resin and 330g (56 parts by weight) of mineral powder were added to Material No. 1 and stirred. Subsequently, molding was performed in the same manner as in Example 1. As the paste thinned, the waste paper pattern became invisible (Fig. 5a).

[0156] [Comparative Example 2] Molding of paper products using waste paper · manufacturing

[0157] An upcycled paper product was prepared as follows from a second composition in the form of a paste, in which the content of grain resin among the total liquid components was 25 wt%. The procedure of Comparative Example 1 was repeated, except that the content of the liquid grain resin was changed to 58 g (10 parts by weight, 25 wt% based on the total liquid components) and the content of the liquid acrylic resin was changed to 172 g (30 parts by weight, 75 wt% based on the liquid components). It was confirmed that the waste paper pattern disappeared as drying progressed (Fig. 5a).

[0159] [Comparative Example 3] Molding of paper products using waste paper · manufacturing

[0160] A paper product was manufactured from a composition in which the liquid component was 100% grain resin without using acrylic resin. Material No. 1 was obtained by immersing waste paper (3 parts by weight) in grain resin (40 parts by weight), and then mineral powder (57 parts by weight) was added to Material No. 1 and stirred. Subsequently, mold molding was performed in the same manner as in Example 1. It was confirmed that drying was slow and the strength of the paper product was weak due to the absence of acrylic resin, and that most of the waste paper pattern disappeared as it dried (Fig. 5a).

[0162] [Comparative Example 4] Molding of paper products using waste paper · manufacturing

[0163] A paper product was manufactured using a composition in which only grain resin was used as the liquid component and the waste paper was not immersed in the liquid. 250g (42 parts by weight) of grain resin was thoroughly mixed with 330g (55 parts by weight) of mineral powder, and then waste paper (3 parts by weight) was added and stirred. Subsequently, mold molding was performed in the same manner as in Example 1. Similar to Comparative Example 3, the drying time was slow and the waste paper pattern disappeared.

[0165] [Comparative Example 5] Molding of paper products using waste paper · manufacturing

[0166] A paper product was manufactured as follows from a second composition in the form of a paste, in which the grain resin content in the total liquid was 2 wt%. 20 g (3 wt%) of primary processed waste paper was immersed in 10 g (2 wt% based on the total liquid component) of liquid grain resin to obtain a primary material. 230 g (38 wt% based on the liquid component) of liquid acrylic resin, 350 g (57 wt%) of acrylic paint and mineral powder were added and stirred, after which the first material was added and stirred. Subsequently, mold forming was performed in the same manner as in Example 1. Since the grain resin content was low relative to the amount of waste paper, the waste paper clumped together, resulting in a small waste paper pattern. The paste became thinner overall (Fig. 5a).

[0168] [Comparative Example 6] Molding of paper products using waste paper · manufacturing

[0169] 20g of paper was immersed in 10g of liquid grain resin and 115g of liquid acrylic resin to obtain Material No. 1. Then, 350g of acrylic paint and mineral powder were added to the 115g of liquid acrylic resin and stirred first, and then Material No. 1 was added and stirred. Except for this, the procedure of Comparative Example 5 was repeated. Compared to the paper product of Comparative Example 5, the waste paper pattern increased relatively, but it appeared messy. Therefore, it was confirmed that the waste paper must be sufficiently immersed in the liquid to express the waste paper pattern without clumping.

[0171] [Comparative Example 7] Molding of paper products using waste paper · manufacturing

[0172] 100g (4 parts by weight) of shredded or ground waste paper was immersed in 500g (18.5 parts by weight) of liquid acrylic resin to obtain Material No. 1. 500g (18.5 parts by weight) of liquid acrylic resin was pre-stirred with 1600g (59 parts by weight) of mineral powder, and then Material No. 1 was added and stirred. Subsequently, molding was performed in the same manner as in Example 1. As the consistency of the paste became thin, a large number of bubbles were generated. Even after removing the bubbles by rubbing the surface of the mold with a transparent film, bubbles reappeared. The curing occurred rapidly, resulting in reduced workability.

[0174] [Comparative Example 8] Molding of paper products using waste paper · manufacturing

[0175] The procedure of Comparative Example 1 was repeated except that the content of primary processed waste paper was changed to 50g (3 parts by weight), the content of liquid grain resin to 144g (9 parts by weight, 25% by weight based on total liquid components), the content of liquid acrylic resin to 431g (27 parts by weight, 75% by weight based on liquid components), and the content of mineral powder to 1000g (62 parts by weight). When mixing the acrylic resin and mineral powder, a sieve was used so that the powder did not clump significantly, but the processing time increased. However, the strength decreased, and the paper product broke 3 days after molding (Fig. 5a).

[0176] [Comparative Example 9] Molding of paper products using waste paper · manufacturing

[0177] Substance No. 1 was obtained by immersing 50g (3 parts by weight) of waste paper in a solution in which 57g (4 parts by weight, 10% by weight based on total liquid components) of liquid grain resin and 58g (20% of total solution) of liquid acrylic resin were stirred. 460g of acrylic resin (acrylic resin content of 32 parts by weight in the total composition, total acrylic resin content of 90% by weight based on liquid components) and 1000g (62 parts by weight) of mineral powder were pre-stirred, after which Substance No. 1 was added and further stirred. Subsequently, molding was performed in the same manner as in Example 1. The mixture was thick, the paper clumped together, and the amount of liquid component in which the waste paper was immersed was small (Fig. 5a).

[0179] [Comparative Example 10] Molding and manufacturing of paper products using waste paper

[0180] Material No. 1 was obtained by immersing 50g (4 parts by weight) of waste paper in 102g of liquid grain resin (20% by weight based on total liquid components). 865g (61 parts by weight) of mineral powder was pre-stirred in a solution prepared by mixing 306g (22 parts by weight, 60% by weight based on total liquid components) and 102g of liquid grain resin (20% by weight based on total liquid components, total grain resin content is 14 parts by weight), and then Material No. 1 was added and stirred. Subsequently, molding was performed using the same method as in Example 1. During the process, a large number of air bubbles rose and the consistency of the paste became watery (Fig. 5b).

[0182] [Comparative Example 11] Molding and manufacturing of paper products using waste paper

[0183] 100% grain resin was used as the liquid component. Material No. 1 was obtained by immersing 20g (4 parts by weight) of waste paper in 250g (36 parts by weight) of liquid grain resin. 346g (61 parts by weight) of mineral powder was added to Material No. 1 and stirred. Subsequently, molding was performed in the same manner as in Example 1. Although the mineral powder was well dispersed, the binding strength was poor, and the waste paper pattern completely disappeared after drying. The background color appeared somewhat messy, there were many small micro-bubbles, and the strength was reduced.

[0185] [Comparative Example 12] Molding and manufacturing of paper products using waste paper

[0186] 60g (4 parts by weight) of waste paper was immersed in 255g of liquid acrylic resin (50% by weight based on total liquid components) to obtain Material No. 1. 865g (60 parts by weight) of mineral powder was added to a solution prepared by mixing 102g of liquid acrylic resin (20% by weight based on total liquid components, total liquid acrylic resin content is 25 parts by weight) and 153g of liquid grain resin (11 parts by weight, 30% by weight based on total liquid components), and stirred first, then Material No. 1 was added and stirred further. Subsequently, mold molding was performed in the same manner as in Example 1. When the waste paper was immersed in the acrylic resin, the paste felt sticky and the waste paper clumped together.

[0188] [Comparative Example 13] Molding and manufacturing of paper products using waste paper

[0189] Material No. 1 was obtained by immersing 60g (4 parts by weight) of waste paper in 255g of liquid acrylic resin (50% by weight based on total liquid components). 865g (60 parts by weight) of mineral powder was added to a solution prepared by mixing 153g of liquid acrylic resin (30% by weight based on total liquid components, total liquid acrylic resin content is 28 parts by weight) and 102g of liquid grain resin (7 parts by weight, 20% by weight based on total liquid components), and stirred first, after which Material No. 1 was added and stirred. Subsequently, mold molding was performed in the same manner as in Example 1. Similar to Comparative Example 12, the waste paper clumped together, and when the acrylic resin was not sufficiently immersed in the waste paper, the waste paper was crushed and fragmented.

[0191] [Comparative Example 14] Molding and manufacturing of paper products using waste paper

[0192] Solution No. 1 was obtained by mixing and stirring 5g of liquid grain resin (2 parts by weight, 5% by weight based on total liquid components) and 97g of liquid acrylic resin (34 parts by weight, 95% by weight based on total liquid components). 100g of waste paper (4 parts by weight) was mixed into 40g of Solution No. 1 (40% by weight of the total solution). ·Substance No. 2 was obtained by immersion. 173g (61 parts by weight) of mineral powder was pre-stirred in the remaining solution of No. 1, and then Substance No. 2 was added and stirred. Subsequently, molding was performed in the same manner as in Example 1. As the content of grain resin decreased, the waste paper clumped together; additionally, when the volume was insufficient when immersing the waste paper in the acrylic resin, the waste paper was shredded, resulting in a messy appearance due to dust. Furthermore, a problem occurred where the drying time became prolonged (Fig. 5b).

[0194] [Comparative Example 15] Molding and manufacturing of paper products using waste paper

[0195] Solution No. 1 was obtained by stirring 77g of liquid grain resin (5 parts by weight, 15% by weight based on total liquid components) and 77g of liquid acrylic resin (30% by weight based on total liquid components). Solution No. 2 was obtained by immersing 75g of waste paper (5 parts by weight) in Solution No. 1. 356g of liquid acrylic resin (total acrylic resin content 30 parts by weight, acrylic resin content 85% by weight based on total liquid components), 865g of acrylic paint and mineral powder (60 parts by weight) were pre-stirred, and then Material No. 2 was added and stirred. Subsequently, molding was performed in the same manner as in Example 1. A phenomenon occurred in which the waste paper clumped together slightly (Fig. 5b).

[0197] [Comparative Example 16] Molding and manufacturing of paper products using waste paper

[0198] Solution No. 1 was obtained by stirring 102g of liquid grain resin (7 parts by weight, 20% by weight based on total liquid components) and 102g of liquid acrylic resin (40% by weight based on total liquid components). Solution No. 1 was obtained by immersing 75g of waste paper (5 parts by weight) in Solution No. 1. 356g of liquid acrylic resin (total acrylic resin content 28 parts by weight, acrylic resin content 80% by weight based on total liquid components), 865g of acrylic paint and mineral powder (60 parts by weight) were pre-stirred, and then Material No. 2 was added and stirred. Subsequently, mold forming was performed in the same manner as in Example 1. Since the content of the grain resin was insufficient, the waste paper pattern almost disappeared (Fig. 5b).

[0200] [Comparative Example 17]

[0201] Water was used instead of grain resin. Solution No. 1 was obtained by stirring 20g of water (1 part by weight, 4% by weight based on liquid components) with 184g of liquid acrylic resin. Material No. 2 was obtained by adding 75g (5 parts by weight) of waste paper to Solution No. 1 and immersing it. 306g of liquid acrylic resin (total acrylic resin content 34 parts by weight, total acrylic resin content 96% by weight based on liquid components), 865g (60 parts by weight) of acrylic paint and mineral powder were pre-stirred, and then Material No. 2 was added and stirred further. Subsequently, molding was performed in the same manner as in Example 1. The waste paper was clumped together, and the surface color appeared rough due to the paper dust generated as the waste paper was broken by the acrylic resin (Fig. 5c).

[0203] [Comparative Example 18] Molding and manufacturing of paper products using waste paper

[0204] A stirrer was used when mixing the grain resin and the acrylic resin. Solution No. 1 was obtained by stirring 143g of grain resin (7 parts by weight, 20% by weight based on total liquid components) and 143g of liquid acrylic resin. Solution No. 1 was added to 105g (5 parts by weight) of waste paper and immersed to obtain Material No. 2. 1211g (60 parts by weight) of acrylic paint and mineral powder was pre-stirred with 428g of liquid acrylic resin (total liquid acrylic resin content 28 parts by weight, 80% by weight based on liquid components), and then Material No. 2 was added and stirred further. Subsequently, molding was performed using the same method as in Example 1. The mixture was too thick, resulting in the formation of large air bubbles (Fig. 5c).

[0206] [Comparative Example 19] Molding and manufacturing of paper products using waste paper

[0207] A paper product was molded using double-sided printed waste paper. Solution No. 1 was obtained by stirring 38g of liquid grain resin (3 parts by weight, 7% by weight based on total liquid components) and 115g of liquid acrylic resin. Solution No. 1 was added to 50g of waste paper (4 parts by weight) and immersed to obtain Material No. 2. 865g (61 parts by weight) of acrylic paint and mineral powder was pre-stirred with 357g of liquid acrylic resin (total liquid acrylic resin content was 33 parts by weight, 93% by weight based on liquid components), and then Material No. 2 was added and stirred further. Subsequently, molding was performed using the same method as in Example 1. The paper clumped together, and despite using double-sided printed waste paper, the pattern was no different from the existing one (Fig. 5c).

[0209] [Comparative Example 20] Molding and manufacturing of paper products using waste paper

[0210] The procedure of Comparative Example 19 was repeated, except that in Solution 1, the content of liquid grain resin was changed to 76g (5 parts by weight, 15% by weight based on total liquid components) and the content of liquid acrylic resin was changed to 76g, and then the liquid acrylic resin was changed to 358g (total liquid acrylic resin content was 30 parts by weight, 85% by weight based on total liquid components). The paste was somewhat runny and the amount of waste paper was small, and all waste paper patterns disappeared after drying (Fig. 5c).

[0212] [Comparative Example 21] Molding and manufacturing of paper products using waste paper

[0213] The procedure of Comparative Example 19 was repeated, except that in Solution 1, the content of liquid grain resin was changed to 76g (5 parts by weight, 15% by weight based on total liquid components), the content of liquid acrylic resin was changed to 76g, the waste paper content was changed to 60g (4 parts by weight), and then the liquid acrylic resin was changed to 358g (total liquid acrylic resin content was 30 parts by weight, 85% by weight based on total liquid components). Although the content of waste paper was increased, results similar to Comparative Example 20 were obtained (Fig. 5d).

[0215] [Comparative Example 22] Molding and manufacturing of paper products using waste paper

[0216] Solution No. 1 was obtained by adding 62g (4 parts by weight) of water to 188g of liquid acrylic resin and stirring. Substance No. 2 was obtained by adding Solution No. 1 to 75g (4 parts by weight) of waste paper and mixing. 865g of acrylic paint and mineral powder were pre-stirred in 322g of liquid acrylic resin (total liquid acrylic resin content 30 parts by weight), and then Substance No. 2 was added and stirred. As the paste became too runny, 180g of mineral powder was added. The pattern of the waste paper was less visible, and as the consistency of the paste thinned with the addition of water, small bubbles rose on the back and hardened (Fig. 5d).

[0218] [Comparative Example 23] Molding and manufacturing of paper products using waste paper

[0219] The procedure of Comparative Example 19 was repeated, except that in Solution 1, the content of liquid grain resin was changed to 77g (5 parts by weight, 15% by weight based on total liquid components), the content of liquid acrylic resin was changed to 77g, the waste paper content was changed to 75g (5 parts by weight), and then the liquid acrylic resin was changed to 356g (total liquid acrylic resin content was 30 parts by weight, 85% by weight based on total liquid components). Although workability was improved compared to Comparative Example 22, a problem occurred in that it took a long time (about 5 days) to completely dry (Fig. 5d).

[0220] Although the present invention has been described above based on exemplary embodiments and examples, the present invention is not limited to the technical concept described in the embodiments and examples. Rather, those skilled in the art to which the present invention pertains can easily devise various modifications and changes based on the aforementioned embodiments and examples. However, it is evident from the claims that all such modifications and changes fall within the scope of the present invention.

Claims

Claim 1 A step of immersing shredded or ground waste paper in a liquid resin component comprising a liquid grain resin, wherein the shredded or ground waste paper is immersed in the liquid resin component at a ratio of 200 to 300 parts by weight of the liquid resin component to 100 parts by weight of the shredded or ground waste paper; a liquid acrylic resin; A step of obtaining a first composition by blending an additive selected from inorganic powder, a pigment, and a combination thereof, wherein the liquid acrylic resin is a liquid acrylic resin in which three types of acrylic monomers, namely methyl methacrylate, butyl acrylate, and 2-ethylhexyl acrylate, constitute a unit unit and are a liquid acrylic resin in which three types of acrylic monomers are synthesized, respectively, from methyl methacrylate, butyl acrylate, and 2-ethylhexyl acrylate, and the inorganic powder is kaolin, wollastonite, alumina, or selenite; A method for manufacturing a paper product using waste paper, comprising: a step of mixing the first composition with a liquid resin in which the crushed or ground waste paper is immersed to obtain a second composition, wherein the content of the liquid grain resin in the liquid component consisting of the liquid acrylic resin and the liquid resin in the second composition is 25 to 40 weight%; and a step of molding the second composition. Claim 2 A method according to claim 1, wherein in the immersion step, the liquid resin component further comprises a liquid acrylic resin. Claim 3 A method according to claim 1, comprising the step of obtaining the second composition, wherein the content of the liquid grain resin in the total liquid component including the liquid acrylic resin and the liquid grain resin in the second composition is 25 to 35 weight%. Claim 4 In claim 1, the method wherein the liquid grain resin comprises liquid grain starch. Claim 5 A method according to claim 1, wherein the liquid acrylic resin and the additive in the first composition are mixed in a weight ratio of 1:2 to 1:

4. Claim 6 A method according to claim 1, wherein, in the step of obtaining the second composition, the mixture is formulated in the ratio of 3 to 6 parts by weight of the crushed or ground waste paper, 6 to 15 parts by weight of the liquid grain resin, 20 to 30 parts by weight of the liquid acrylic resin, and 55 to 65 parts by weight of the additive. Claim 7 A method according to claim 1, wherein the forming step comprises a mold forming step. Claim 8 A composition for manufacturing paper products using waste paper, comprising 3 to 6 parts by weight of shredded or ground waste paper, 6 to 15 parts by weight of liquid grain resin, 20 to 30 parts by weight of liquid acrylic resin, and 55 to 65 parts by weight of an additive selected from inorganic powder, pigment, and combinations thereof, wherein the liquid acrylic resin is a liquid acrylic resin that is a ternary copolymer in which three types of acrylic monomers, namely methyl methacrylate, butyl acrylate, and 2-ethylhexyl acrylate, constitute a unit, or is a liquid acrylic resin that is synthesized from three types of acrylic monomers, namely methyl methacrylate, butyl acrylate, and 2-ethylhexyl acrylate, respectively, and the inorganic powder is kaolin, wollastonite, alumina, or selenite. Claim 9 A composition according to claim 8, comprising 4 to 5 parts by weight of the crushed or ground waste paper, 9 to 13 parts by weight of the liquid grain resin, 24 to 28 parts by weight of the liquid acrylic resin, and 58 to 62 parts by weight of the additive. Claim 10 A paper product using waste paper manufactured using the method described in any one of claims 1 to 7.

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