Composition for cured body, cured body, and method for producing the composition for cured body

Abstract

The present invention provides a hardening composition, a hardened body, and a method for producing the hardened composition, which make effective use of eggshells and reduce the environmental burden caused by the extraction of natural resources. [Solution] The hardened body composition comprises slaked lime and / or quicklime derived from eggshells, fine aggregate containing celben derived from ceramics, fibrous material containing fibers, and a binder. This makes it possible to effectively utilize eggshells and reduce the environmental burden caused by the extraction of natural resources.

Description

Technical Field

[0001] The present invention relates to a composition for a cured body, a cured body, and a method for producing a composition for a cured body.

Background Art

[0002] Conventionally, a cured body obtained by curing a composition for a cured body has been known. For example, in Patent Document 1, in terms of solid content conversion, slaked lime is contained at 50% by weight or more, aggregate is 20 to 44% by weight, wheat fiber is 1 to 20% by weight, and an ethylene-vinyl acetate-based or acrylic-based polymer is contained at 5 to 15% by weight. A composition for a cured body is described in which the average particle diameter of the polymer is 0.5 μm or more and titanium oxide is not contained.

[0003] Further, in Patent Document 2, a cured body is described which mainly consists of lime, fine aggregate, and kneading water, the lime is quicklime and / or slaked lime, the fine aggregate is sand and bamboo chips pulverized into fibrous form, and the weight ratio of bamboo chips to lime is 40 to 80%, and the weight ratio of bamboo chips to sand is 10 to 30%.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The hardening composition described in Patent Document 1 contains 50% by weight or more of slaked lime on a solid content basis. The hardening body described in Patent Document 2 contains quicklime and / or slaked lime. Quicklime is produced by calcining limestone at a predetermined temperature. Slaked lime is produced by scalding quicklime with water. Therefore, according to the technologies described in Patent Documents 1 and 2, it is necessary to mine limestone, which is the raw material for the hardening composition or the hardening body. Recently, the environmental burden caused by limestone mining has become a problem.

[0006] Furthermore, with regard to aggregates related to Patent Document 1 and fine aggregates related to Patent Document 2, if natural minerals are used, the environmental burden due to mining becomes a problem, similar to limestone.

[0007] On the other hand, eggshells, which are discharged as a by-product of the production process at liquid egg manufacturing plants and hatcheries, are designated as industrial waste due to their animal and plant residue. Therefore, the disposal of eggshells is a significant economic burden for businesses. Furthermore, securing landfill space for industrial waste has recently become a problem. For these reasons, there is a desire to effectively utilize eggshells that have previously been disposed of as industrial waste.

[0008] This invention was made in view of the above background, and aims to provide a hardened material composition, a hardened material, and a method for producing the hardened material composition that effectively utilize eggshells and reduces the environmental burden caused by the extraction of natural resources. [Means for solving the problem]

[0009] A first aspect of the present invention is: Slaked lime and / or quicklime derived from eggshells, Fine aggregate containing celben derived from ceramics, Fiber-containing materials, The composition for curing includes a binder.

[0010] A second aspect of the present invention is: The above-mentioned composition for curing is present in the cured body.

[0011] A third aspect of the present invention is: A method for producing the above-mentioned cured body composition, Quicklime is produced by heating the eggshells at a temperature between 750°C and 1300°C. By mixing the aforementioned quicklime with water and scalding it, slaked lime is produced. The fine aggregate is produced by crushing ceramics, The transfer paper comprises a base material, an adhesive layer formed on the surface of the base material, and a paint layer formed on the side of the adhesive layer opposite to the base material, from which the paint layer is peeled off. The fibrous material is generated by defibrating the transfer paper from which the paint layer has been peeled off. The present invention relates to a method for producing a hardened body composition, comprising mixing the slaked lime and / or quicklime, the fine aggregate, the fibrous material, and the binder. [Effects of the Invention]

[0012] According to the first to third aspects of the present invention, it is possible to obtain a hardened material composition, a hardened material, and a method for producing a hardened material composition that effectively utilize eggshells and reduce the environmental burden caused by the extraction of natural resources. [Brief explanation of the drawing]

[0013] [Figure 1] The main flow of the manufacturing process for the cured body composition according to this embodiment. [Figure 2] A flowchart of the slaked lime and / or quicklime production process according to this embodiment. [Figure 3] A flowchart of the fine aggregate manufacturing process according to this embodiment. [Figure 4] A flowchart of the fibrous material manufacturing process according to this embodiment. [Figure 5] This is a cross-sectional view showing a state in which the hardened body composition according to this embodiment has been formed on one side of a gypsum board. [Modes for carrying out the invention]

[0014] The following describes this embodiment. In this specification, the lower and upper limit values of a numerical range can be arbitrarily combined (hereinafter, omitted).

[0015] The cured body according to this embodiment is obtained by curing a composition for a cured body. The composition for a cured body and the cured body according to this embodiment can be widely applied to any use, such as an adhesive use for bonding building materials such as tiles and bricks, and a coating material use for coating the surface of a wall material.

[0016] The composition for a cured body according to this embodiment includes slaked lime and / or quicklime derived from eggshells, fine aggregate containing serpen derived from ceramics, fibrous material containing fibers, and a binder.

[0017] Slaked lime (Ca(OH)2) and / or quicklime (CaO) cures by reacting with carbon dioxide in the air. Slaked lime and / or quicklime continues to cure by absorbing carbon dioxide in the air even after the moisture has dried.

[0018] The composition for a cured body may contain one or both of slaked lime and quicklime. From the viewpoints of suppressing heat generation due to the reaction with water during the preparation of the composition for a cured body and handling properties, slaked lime can be preferably used. However, only quicklime may be used.

[0019] The slaked lime and / or quicklime according to this embodiment is derived from eggshells. Derived from eggshells means that after firing the eggshells at a predetermined temperature to produce quicklime, slaked lime is produced by mixing the quicklime and water and digesting them. However, unreacted quicklime that has not completely chemically changed may remain in the composition for a cured body.

[0020] Eggshells can be recycled from waste eggshells discharged from factories that process chicken eggs, such as liquid egg production plants and hatcheries. However, eggshells are not limited to chicken eggs; eggshells from other birds, such as quail, may also be used. Eggshells may be used with the eggshell membrane still attached, or with the membrane removed beforehand. There are no particular limitations on the method for removing the eggshell membrane from the eggshells; any method can be used, such as using a jet mill, using a difference in specific gravity in water, or dissolving only the eggshell membrane.

[0021] In this embodiment, eggshells are calcined at a temperature of 750°C to 1300°C. This removes the eggshell membrane adhering to the eggshells and chemically converts the calcium carbonate (CaCO3), a component of eggshells, into quicklime. Temperatures below 750°C are undesirable because the chemical conversion of calcium carbonate into quicklime becomes difficult. Temperatures above 1300°C are also undesirable because they increase manufacturing costs and cause the melting of calcium oxide, etc.

[0022] Eggshells disintegrate during the manufacturing process of the hardening body composition. Furthermore, during the slag generation process, the quicklime reacts with water and becomes finely powdered. Therefore, it is not always necessary to crush the eggshells. However, the eggshells may be crushed, either before or after calcination. By crushing, a relatively fine powder of slaked lime and / or quicklime can be obtained. The particle size of the eggshells is not limited. However, if the eggshells are crushed beforehand depending on the intended use, the method is not particularly limited; for example, a jet mill, ball mill, stamp mill, fret mill, grinder, etc., can be used.

[0023] By using eggshells as a raw material for slaked lime and / or quicklime, the environmental burden of limestone mining can be reduced. Furthermore, since eggshells contain fewer transition metal-derived impurities compared to mined limestone, the whiteness of the hardened body composition and the hardened body can be improved.

[0024] Furthermore, by using eggshells as a raw material for slaked lime and / or quicklime, the economic burden of disposing of eggshells can be reduced. Additionally, the need to secure landfill space for eggshell disposal is reduced, thus mitigating the environmental impact.

[0025] Fine aggregate suppresses the occurrence of cracks in the hardened body by suppressing shrinkage that occurs when the hardened body dries. The fine aggregate according to this embodiment includes celben derived from ceramics. Cerben derived from ceramics means using celben produced by crushing ceramics. The ceramics are not particularly limited, and crushed earthenware and / or porcelain can be used. That is, the celben may consist only of crushed earthenware, or only of crushed porcelain, or both of crushed earthenware and porcelain. The earthenware and / or porcelain may be colored or uncolored and plain. When using celben produced by crushing plain earthenware and / or porcelain, the whiteness of the hardened body composition and the hardened body can be improved.

[0026] By using bone china as a raw material for fine aggregate, the whiteness of the hardened body composition and the hardened body can be further improved. This is thought to be because it does not reduce the whiteness of slaked lime and / or quicklime compared to using natural minerals as fine aggregate. However, the definition of bone china is based on JIS S2401.

[0027] The method for crushing ceramics is not particularly limited; for example, a jet mill, ball mill, stamp mill, fret mill, or grinder can be used. The particle size range of Cellben is not particularly limited. When the particle size range of Cellben is 0.04 or more and less than 0.08 mm, a glossy, smooth surface can be formed on the hardened body. When the particle size range of Cellben is 0.5 or more and less than 0.7 mm, a matte, rough surface can be formed on the hardened body. Furthermore, when the particle size range of Cellben is 1.0 or more and less than 3.5 mm, a surface with intentionally added irregularities and roughness can be formed on the hardened body.

[0028] When the particle size range of Cellben is less than 3.5 mm, it is preferable because the coatability is improved. However, when the particle size range of Cellben exceeds 3.5 mm, the curing composition and cured body can be applied to applications where coatability to wall surfaces does not need to be considered, such as bonding stacked roof tiles together.

[0029] By crushing ceramics and then sieving them, fine aggregate with a desired particle size distribution can be produced. This allows the surface of the hardened body to be formed into a shape corresponding to the particle size range. As a result, a hardened body with superior design qualities can be obtained compared to when natural minerals are used as fine aggregate.

[0030] Furthermore, by using ceramics as a raw material for fine aggregate, the environmental impact can be reduced compared to mining natural minerals.

[0031] Furthermore, by using discarded ceramics resulting from firing defects, those with cracks, chips, or damage, or those that have discolored due to long-term use, as raw materials for fine aggregate, the economic burden and environmental impact associated with the disposal of discarded ceramics can be reduced.

[0032] The fibrous material has the effect of preventing shrinkage of the hardened material and reinforcing the hardened material. The fibers included in the fibrous material are not particularly limited, and any fiber can be appropriately selected. The fibers may be natural fibers such as hemp or straw, synthetic fibers such as vinylon fibers, polypropylene fibers, polyester fibers, polyethylene terephthalate fibers, acrylic fibers, or aramid fibers, non-metallic fibers such as glass fibers or carbon fibers, metallic fibers, or fibers obtained by defibrating paper.

[0033] The paper to be defibrated is not particularly limited; it can be Japanese paper or Western paper. Suitable paper for defibration is the base material of transfer paper used for painting on ceramics. Transfer paper comprises a base material, an adhesive layer formed on the surface of the base material, and a paint layer formed on the side of the adhesive layer opposite the base material. The base material is made of paper. The adhesive layer is preferably water-soluble.

[0034] Traditionally, the base material of transfer paper was discarded in the transfer paper painting technique commonly used in the ceramics manufacturing industry. Therefore, by creating a fibrous material using the base material of transfer paper, it becomes possible to reuse the base material, thereby reducing the environmental impact of discarding the base material.

[0035] Furthermore, since the paper used as the base material for the transfer paper has high whiteness, the whiteness of the curing body composition and the cured body can be improved.

[0036] When decorating ceramics, the transfer paper is immersed in water for a predetermined time, then the base material and the paint layer are separated, and the paint layer is applied to the surface of the ceramic. In this embodiment, a fibrous material is generated by defibrating the base material that has been separated from the paint layer.

[0037] The substrate may or may not have a residual adhesive layer. A residual adhesive layer is preferable because it improves the moisture retention of the cured body composition. This improves the plasticity when the cured body composition is mixed with water for use. The adhesive that constitutes the adhesive layer is not particularly limited; for example, dextrin, starch, polyvinyl alcohol, etc., can be used.

[0038] The binder is not particularly limited and may contain one or more selected from natural seaweeds such as sea lettuce and seaweed, cellulosic water-soluble polymers such as methylcellulose, carboxymethylcellulose, and hydroxyethylcellulose, starch-based water-soluble polymers such as cationized guar gum, alginic acid-based water-soluble polymers such as sodium alginate, and vinyl-based water-soluble polymers such as carboxyvinyl polymer and polyvinyl alcohol.

[0039] From the viewpoint of coating properties, the composition for the cured body preferably contains: slaked lime and / or quicklime: 2 parts by mass or more and less than 96 parts by mass; fine aggregate: 2 parts by mass or more and less than 96 parts by mass; fibrous material: 1 part by mass or more and less than 20 parts by mass; and binder: 1 part by mass or more and less than 15 parts by mass. A detailed explanation follows below.

[0040] In the composition for hardened bodies, the content of slaked lime and / or quicklime is preferably 2 parts by mass or more and less than 96 parts by mass, more preferably 7 parts by mass or more and less than 77 parts by mass, and even more preferably 10 parts by mass or more and less than 65 parts by mass, from the viewpoint of coating properties.

[0041] In the composition for cured bodies, the content of fine aggregate is preferably 2 parts by mass or more and less than 96 parts by mass, more preferably 20 parts by mass or more and less than 90 parts by mass, and even more preferably 30 parts by mass or more and less than 85 parts by mass, from the viewpoint of coating properties. Furthermore, a fine aggregate content of 85 parts by mass or more is preferable because it improves the Mohs hardness of the cured body after curing.

[0042] In the composition for cured bodies, the content of fibrous material is preferably 1 part by mass or more and less than 20 parts by mass, more preferably 1 part by mass or more and less than 15 parts by mass, and even more preferably 2 parts by mass or more and less than 10 parts by mass, from the viewpoint of coating properties.

[0043] In the composition for cured bodies, the binder content is preferably 1 part by mass or more and less than 15 parts by mass, more preferably 2 parts by mass or more and less than 13 parts by mass, and even more preferably 3 parts by mass or more and less than 11 parts by mass, from the viewpoint of coating properties.

[0044] The wall material to which the hardening composition is applied is not particularly limited and can be applied to the surface of any wall material, such as earthen walls, stone walls, tiles, bricks, gypsum boards, cement, mortar, and concrete.

[0045] The composition for curing the hardened body may also contain an aqueous solvent. The amount of aqueous solvent is arbitrary and should be adjusted according to the intended use of the hardened body or the surface properties of the hardened body after curing, so that the hardened body can achieve the desired fluidity. When the composition for curing the hardened body contains an aqueous solvent, the composition ratios of the above-mentioned components may also be expressed as the composition ratio of each component on a solid weight basis.

[0046] As aqueous solvents, water, aqueous liquid miscibles (for example, aqueous solutions of admixtures or emulsion-type polymers) can be used. Aqueous solvents may contain additives such as preservatives.

[0047] The uses of the cured body composition and cured body according to this embodiment are not particularly limited. The cured body composition and cured body according to this embodiment can be suitably used, for example, as a substitute for plaster in building materials, coatings, etc.

[0048] By using eggshells as a raw material for slaked lime and / or quicklime, waste ceramics as a raw material for fine aggregate, and waste transfer paper as a raw material for fibrous material, the main components of the hardened body composition and the hardened body can be derived from recycled materials. This reduces the environmental burden when disposing of eggshells, waste ceramics, and waste transfer paper.

[0049] Next, a composition for cured bodies and a method for manufacturing cured bodies will be described. However, the method for manufacturing cured bodies is not limited to the following description.

[0050] Figure 1 shows the main flow of the manufacturing process for the hardened body according to this embodiment. When the manufacturing of the hardened body composition and the hardened body is started, the manufacturing process of slaked lime and / or quicklime is carried out (S1). Next, the manufacturing process of fine aggregate is carried out (S2). Next, the manufacturing process of fibrous material is carried out (S3). Next, the manufacturing process of binder is carried out (S4). Next, the process of mixing solids such as slaked lime and / or quicklime, fine aggregate, fibrous material, and binder is carried out (S5). This produces the hardened body composition. Next, an aqueous solvent is mixed into the manufactured hardened body composition (S6). The hardened body composition mixed with the aqueous solvent may be coated onto a desired object or used to bond desired objects together. The hardened body composition mixed with the aqueous solvent hardens as the water evaporates and dries.

[0051] Figure 2 shows a flowchart of the process (S1) for producing slaked lime and / or quicklime. When the process (S1) for producing slaked lime and / or quicklime is performed, the eggshells are crushed using a jet mill, ball mill, stamp mill, fret mill, grinder, etc. (S11). The eggshells may have the eggshell membrane attached or the eggshell membrane may be removed. However, if the eggshells are not to be crushed, step S11 may be omitted.

[0052] Next, the eggshells are calcined at a temperature between 750°C and 1300°C (S12). The calcination of the eggshells can be carried out by known means such as an electric furnace or a gas furnace. Quicklime is produced by calcining the eggshells.

[0053] However, the process of crushing the eggshells may be carried out after the process of calcining the eggshells.

[0054] Next, the generated quicklime is slaked by mixing it with water, chemically converting the quicklime into slaked lime (S13). At this time, the quicklime may be completely converted into slaked lime, or some of the quicklime may remain. The step of slaked lime may also be omitted. Thus, slaked lime and / or quicklime are produced.

[0055] Figure 3 shows a flowchart of the process (S2) for manufacturing fine aggregate. When the process (S2) for manufacturing fine aggregate is executed, the ceramic is crushed (S21). The ceramic can be crushed using known methods such as a jet mill, ball mill, stamp mill, fret mill, or grinder. Waste ceramic can be suitably used as the ceramic. The ceramic may be colored or plain. When bone china is selected as the ceramic, it is preferable because it improves the whiteness of the hardened body composition and the hardened body.

[0056] Next, the crushed ceramics are sieved using a sieve (S22). The crushed ceramics are sieved using a sieve with a predetermined mesh size. This allows for the production of fine aggregate with a desired particle size range. By selecting fine aggregate with a desired particle size range, the surface condition of the hardened body can be altered. Thus, fine aggregate is produced.

[0057] Figure 4 shows a flowchart of the fibrous material manufacturing process (S3). Once the fibrous material manufacturing process (S3) is executed, the paint layer is removed by immersing the transfer paper in water (S31). This process is performed in the process of painting on the surface of ceramics.

[0058] The substrate from which the paint layer has been removed is recovered. The recovered substrate is defibrated by being placed in water or an aqueous solvent and stirred (S32). After the substrate is defibrated, a fibrous material is produced by evaporating the water or aqueous solvent. The substrate may or may not have a glue layer remaining. If a glue layer remains on the substrate, the fibrous material contains the material that constitutes the glue layer. [Examples]

[0059] (Example 1) Next, Example 1 will be described. Eggshells with attached eggshell membranes were calcined at 1000°C for 10 hours using an electric or gas furnace. This produced quicklime. The quicklime was slaked by adding water and stirring. This yielded slaked lime.

[0060] Cellben was produced by crushing bone china using a ball mill or the like. The bone china could be defective products such as those with firing defects or molding defects, or discarded products that had been damaged or chipped during use. In Example 1, colored bone china was used. Fine aggregate with a particle size range of 0.5 to 0.7 mm was produced by sieving the Cellben. Specifically, the fine aggregate that passed through a 22-mesh sieve and remained on a 35-mesh sieve was used.

[0061] The substrate from which the paint layer had been removed was immersed in water and stirred to dissolve the fibers. Then, it was dried to evaporate the water, generating a fibrous material.

[0062] As the binder, we used PVA-220 manufactured by Kuraray Co., Ltd. The binder in this Example 1 contains polyvinyl alcohol (PVA).

[0063] As described above, 96 parts by mass of slaked lime derived from eggshells, 2 parts by mass of fine aggregate with a particle size range of 0.5 to 0.7 mm, 1 part by mass of fibrous material derived from transfer paper, and 1 part by mass of binder containing PVA were weighed and placed into a mixing device such as a trommel or ball mill, and then a predetermined amount of water was added and mixed.

[0064] (Examples 2 to 18) Examples 2 to 18 were prepared in the same manner as in Example 1, except that eggshell-derived slaked lime, fine aggregate with a particle size range of 0.5 to 0.7 mm, fibrous material derived from transfer paper, and a binder containing PVA were weighed according to the formulations shown in Table 1.

[0065] (Comparative Example 1) Comparative Example 1 used Plaster Co., Ltd.'s "Shikkui Uma~ku Nureru White". The hardened body of Comparative Example 1 contained 61 parts by mass of slaked lime, 35 parts by mass of fine aggregate derived from natural stone, 2 parts by mass of fibrous material, and 2 parts by mass of binder. The slaked lime in Comparative Example 1 is derived from limestone. That is, limestone is heated to produce quicklime, which is then slaked with water. The type of natural stone constituting the fine aggregate is unknown. The particle size distribution of the fine aggregate is also unknown. The fibrous material is unknown. The binder is unknown. Comparative Example 1 was prepared in the same manner as in Example 1, except for the above.

[0066] (Comparative Example 2) Comparative Example 2 is 100% Organic Plaster DIY NURI manufactured by Tagawa Sangyo Co., Ltd. 2 Natural white was used. The hardened body according to Comparative Example 2 contains 53 parts by mass of slaked lime, 44 parts by mass of fine aggregate derived from natural stone, 1.5 parts by mass of fibrous material, and 1.5 parts by mass of binder. The slaked lime according to Comparative Example 1 is derived from limestone. That is, limestone is heated to produce quicklime, which is then slaked with water. The type of natural stone constituting the fine aggregate is unknown. The particle size distribution of the fine aggregate is also unknown. The fibrous material is unknown. The binder is unknown. Comparative Example 2 was prepared in the same manner as in Example 1, except for the above.

[0067] (Comparative Example 3 to Comparative Example 6) Comparative Examples 3 to 6 were prepared in the same manner as in Example 1, except that eggshell-derived slaked lime, fine aggregate with a particle size range of 0.5 to 0.7 mm, fibrous material derived from transfer paper, and a binder containing PVA were weighed according to the formulations shown in Table 1.

[0068] (Method for evaluating the presence or absence of cracks and delamination) The prepared hardened material was applied to one side of a 9.5 mm thick gypsum board manufactured by Chiyoda Ute Co., Ltd., to a thickness of 2 to 4 mm using a Topman Kanete stainless steel thin trowel (240 mm). After 24 hours or more had passed for drying and hardening, the surface of the hardened material was visually inspected to determine if any cracks or peeling had occurred. The results of Examples 1 to 18 are summarized in Table 1, and the results of Comparative Examples 1 to 6 are summarized in Table 2.

[0069] (Whiteness measurement method) The whiteness of the cured material applied to gypsum board was measured using a Color meter ZE6000 manufactured by Nippon Denshoku Industries Ltd., in accordance with JIS Z 8722 and ASTM E 313. The results of Examples 1 to 18 are summarized in Table 1, and the results of Comparative Examples 1 to 6 are summarized in Table 2.

[0070] (Method for evaluating the height of the protrusion) Figure 5 shows a state in which a hardened body 20 has been formed on one surface 11 of a gypsum board 10. As shown in Figure 5, protrusions 21 derived from the fine aggregate may be formed on the surface of the hardened body 20 formed on one surface 11 of the gypsum board 10. As an indicator of the surface condition of the hardened body 20, the protruding height of the protrusions 21 is measured as follows. First, the thickness T is measured between the other surface 12 of the gypsum board 10 that is not coated with the hardened body 20 and the apex of the protrusion 21 of the hardened body 20. Next, the thickness t is measured between the other surface 12 of the gypsum board 10 and the surface of the hardened body 20 in which the protrusions 21 have not been formed. The height of the protrusion 21 is obtained by subtracting the thickness t from the thickness T. The results of Examples 1 to 18 are summarized in Table 1, and the results of Comparative Examples 1 to 6 are summarized in Table 2.

[0071] (Mohs hardness scale) The Mohs hardness of the hardened surface of a gypsum board coating was measured. Mohs hardness is a method of measuring hardness by setting standard minerals with hardness levels from 1 to 10, rubbing the standard material against the material being measured, and determining whether or not scratches are left. As standard materials for Mohs hardness, talc was used for Mohs hardness level 1, gypsum for Mohs hardness level 2, calcite for Mohs hardness level 3, fluorite for Mohs hardness level 4, apatite for Mohs hardness level 5, orthoclase for Mohs hardness level 6, quartz for Mohs hardness level 7, topaz for Mohs hardness level 8, corundum for Mohs hardness level 9, and diamond for Mohs hardness level 10. The results of Examples 1 to 18 are summarized in Table 1, and the results of Comparative Examples 1 to 6 are summarized in Table 2.

[0072] [Table 1]

[0073] [Table 2]

[0074] Comparative Examples 1 and 2 use slaked lime derived from limestone, along with fine aggregate derived from natural stone. In contrast, Examples 1 to 18 use slaked lime derived from eggshells, along with fine aggregate derived from waste ceramics. As a result, the hardened body compositions of Examples 1 to 18 can reduce the environmental burden related to waste disposal compared to Comparative Examples 1 and 2.

[0075] Furthermore, in Examples 1 to 18, no cracks or peeling were observed on the surface of the hardened material formed on the surface of the gypsum board, whereas in Comparative Examples 3 to 6, cracks and peeling were observed on the surface of the hardened material formed on the surface of the gypsum board. This indicates that Examples 1 to 18 have superior coating properties on gypsum board compared to Comparative Examples 3 to 6.

[0076] The cured body compositions according to Examples 1 to 18 contain: slaked lime and / or quicklime: 2 parts by mass or more and less than 96 parts by mass; fine aggregate: 2 parts by mass or more and less than 96 parts by mass; fibrous material: 1 part by mass or more and less than 20 parts by mass; and binder: 1 part by mass or more and less than 15 parts by mass. As a result, it can be seen that the coatability on the surface of the wall material is improved. Thus, the cured body compositions containing the components according to the above composition can be suitably used as coating material compositions to be applied to the surface of wall materials.

[0077] Furthermore, the whiteness of Examples 1-3 and 11-15 (94.98-96.33) was found to be higher than that of Comparative Example 1 (94.96). This is thought to be due to the use of bone china as the fine aggregate and the use of transfer paper as the fibrous material. In the case of Comparative Examples 3-6, the whiteness could not be measured because cracks and peeling occurred in the hardened body after coating the surface of the gypsum board.

[0078] Furthermore, it was found that the Mohs hardness of Examples 1 to 18 (4 to 6) was greater than that of Comparative Examples 1 to 2 (3). This is thought to be due to the use of celben, derived from ceramics, as the fine aggregate. In the case of Comparative Examples 3 to 6, it was not possible to measure the Mohs hardness because cracks and delamination occurred in the hardened material after coating the surface of the gypsum board.

[0079] (Examples 19-23 and 25-34) Examples 19 to 23 and Examples 25 to 34 were prepared in the same manner as Example 1, except that the binder containing eggshell-derived slaked lime, fine aggregate, fibrous material derived from transfer paper, and PVA was weighed according to the formulations shown in Table 3, and the particle size range of the fine aggregate was set to the range shown in Table 3.

[0080] (Example 24) Example 24 was prepared in the same manner as Example 1, except that eggshell-derived slaked lime, fine aggregate, fibrous material derived from transfer paper, and a binder containing PVA were weighed according to the formulation shown in Table 3, the particle size range of the fine aggregate was set to the range shown in Table 3, and Bond Woodworking Bond manufactured by Konishi Co., Ltd. was used as the binder. The binder in Example 24 contains polyvinyl acetate. Polyvinyl acetate is an example of a carboxyvinyl polymer.

[0081] (Grain size range of fine aggregate) Fine aggregates within the particle size ranges shown in Table 3 were prepared by sieving the crushed plain bone china (Celven) using a sieve. For the particle size range of 1.0-3.5 mm, the fine aggregate that passed through a 6-mesh sieve and remained on a 14-mesh sieve was used. For the particle size range of 0.5-0.7 mm, the fine aggregate that passed through a 22-mesh sieve and remained on a 35-mesh sieve was used. For the particle size range of 0.04-0.08 mm, the fine aggregate that passed through a 200-mesh sieve and remained on a 350-mesh sieve was used.

[0082] Examples 19 to 24 were prepared using fine aggregate with a particle size range of 1.0-3.5 mm, as described above; Examples 25 to 29 were prepared using fine aggregate with a particle size range of 0.5-0.7 mm; and Examples 30 to 34 were prepared using fine aggregate with a particle size range of 0.04-0.08 mm.

[0083] [Table 3]

[0084] As shown in Table 3, for Examples 19 to 24, where the particle size range of the fine aggregate was 1.0-3.5 mm, the height of the protrusions formed on the surface of the hardened material was between 1.20 mm and 1.59 mm. By using fine aggregate within the above particle size range, it is possible to form a hardened material with a surface that intentionally has irregularities and roughness.

[0085] As shown in Table 3, for Examples 25 to 29, where the particle size range of the fine aggregate was 0.5-0.7 mm, the height of the protrusions on the hardened body formed on the surface of the gypsum board ranged from 0.38 mm to 0.88 mm. By using fine aggregate within the above particle size range, it is possible to form a matte, rough surface on the hardened body.

[0086] As shown in Table 3, for Examples 30 to 34, where the particle size range of the fine aggregate was 0.04-0.08 mm, the height dimension of the protrusions formed on the surface of the hardened body was 0.00 mm. By using fine aggregate within the above particle size range, a glossy, smooth surface can be formed on the hardened body.

[0087] As described above, by appropriately setting the particle size range of the fine aggregate, a hardened body having a desired surface condition can be obtained.

[0088] (Examples 35-37) Examples 35 to 37 were prepared in the same manner as in Example 1, except that eggshell-derived slaked lime, fine aggregate, fibrous material derived from transfer paper, and a binder containing PVA were weighed according to the formulations shown in Table 4, and the particle size range of the fine aggregate was set to the range shown in Table 4.

[0089] [Table 4]

[0090] Example 35 contains 24 parts by mass of fibrous material. Therefore, the cured body according to Example 35 exhibits suppressed shrinkage and improved strength due to the fibrous material. No cracks or delamination occurred on the surface of the cured body according to Example 35. However, because some of the fibrous material was exposed from the surface of the cured body, a smooth surface was not formed. Therefore, Example 35 is suitable for applications where the formation of a smooth surface is not required, such as adhesive applications for bonding building materials like roof tiles and bricks.

[0091] Example 36 contains 18 parts by mass of binder. Therefore, Example 36 has improved water retention, resulting in improved workability during coating. Cracks occurred on the surface of the cured body according to Example 36. This is thought to be due to the shrinkage of the binder, which caused cracks to form on the surface of the cured body. Example 36 can also be suitably used for bonding building materials such as roof tiles and bricks.

[0092] Example 37 contains fine aggregate with a particle size range of 3.5–6.5 mm. For the 3.5–6.5 mm particle size range, the fine aggregate that passed through a 3-mesh sieve and remained on a 6-mesh sieve was used. In Example 37, the particles of the fine aggregate were too coarse, so it could not be applied to gypsum board. However, Example 37 can still be suitably used for adhesive applications, such as bonding building materials like roof tiles and bricks.

[0093] The present invention is not limited to the embodiments described above, and can be applied to various embodiments without departing from its spirit. [Explanation of symbols]

[0094] 10: Gypsum board, 20: Hardened body, 21: Protrusion

Claims

1. Slaked lime and / or quicklime derived from eggshells, Fine aggregate containing celben derived from ceramics, Fiber-containing materials, A composition for curing, comprising a binder.

2. The aforementioned Cellben is derived from bone china, and is the cured body composition according to claim 1.

3. The fibrous material is a fibrous material derived from transfer paper, The aforementioned transfer paper is Substrate and The adhesive layer formed on the surface of the substrate, The adhesive layer comprises a paint layer formed on the side opposite to the substrate, The fibrous material comprises a component derived from the base material, as described in claim 1 or 2, for use in a cured body composition.

4. The cured body composition according to claim 3, wherein the fibrous material comprises an adhesive derived from the adhesive layer of the transfer paper.

5. The composition for cured body is The slaked lime and / or quicklime: 2 parts by mass or more and less than 96 parts by mass, The fine aggregate: 2 parts by mass or more and less than 96 parts by mass, The fibrous material: 1 part by mass or more and less than 20 parts by mass, The aforementioned binder: 1 part by mass or more and less than 15 parts by mass, A composition for cured bodies according to claim 1, comprising:

6. The cured body composition according to claim 1, wherein the particle size range of the Cellben is 0.04 mm or more and less than 0.08 mm.

7. The cured body composition according to claim 1, wherein the particle size range of the Cellben is 0.5 mm or more and less than 0.7 mm.

8. The cured body composition according to claim 1, wherein the particle size range of the Cellben is 1.0 mm or more and less than 3.5 mm.

9. Furthermore, the composition for cured bodies according to claim 1, further comprising an aqueous solvent.

10. A cured body obtained by curing the composition for cured bodies described in claim 9.

11. A method for producing the cured body composition according to claim 1, Quicklime is produced by heating the eggshells at a temperature of 750°C to 1300°C. By mixing the aforementioned quicklime with water and scalding it, slaked lime is produced. The fine aggregate is produced by crushing ceramics, The transfer paper comprises a base material, an adhesive layer formed on the surface of the base material, and a paint layer formed on the side of the adhesive layer opposite to the base material, from which the paint layer is peeled off. The fibrous material is generated by defibrating the transfer paper from which the paint layer has been peeled off. A method for producing a hardened body composition, comprising mixing the slaked lime and / or quicklime, the fine aggregate, the fibrous material, and the binder.

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