Recycled material for glass forming, method for producing recycled material for glass forming, method for producing glass, and glass

Abstract

To provide a recycled material for glass molding which can use a recycled material recycled as a material other than glass as a material for manufacturing glass, a method for manufacturing a recycled material for glass molding, a method for manufacturing glass, and glass.SOLUTION: A recycled material for glass molding is blended with a recycled material recycled from a material other than glass and is used for glass molding contains at least any one of a grain-derived recycled material containing a grain-derived silicon component composed of a silicon component derived from a grain, and a molding-derived recycled material containing a molding-derived calcium component that is a calcium component derived from a molding formed by blending a material containing an inorganic substance containing a calcium component and a thermoplastic resin at a predetermined blending ratio, as the recycled material.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a recycled material for glass molding, a method for manufacturing the recycled material for glass molding, a method for manufacturing glass, and glass.

Background Art

[0002] Conventionally, as disclosed in Non-Patent Document 1 and Non-Patent Document 2 below, glass bottles have been reused in the form of reuse or recycling. Specifically, as disclosed in Non-Patent Document 1, glass bottles can be reused in a form called reuse, in which the collected used bottles are washed and reused repeatedly. Also, as disclosed in Non-Patent Document 2, glass bottles can be reused in a form called recycling, in which cullet obtained by finely crushing used bottles is utilized to make glass products such as new bottles.

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Non-Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, as described above, in a form such as crushing a glass bottle into cullet and recycling it as a resource for forming glass products, used glass can be utilized to create glass products of new glass containers. However, in view of making effective use of limited resources, it is preferable to enable not only used glass but also materials other than glass to be utilized as materials for manufacturing glass.

[0005] Therefore, the present invention aims at providing a recycled material for glass molding that can be utilized as a material for manufacturing glass, which is recycled from materials other than glass, a method for manufacturing the recycled material for glass molding, a method for manufacturing glass, and the provision of glass.

Means for Solving the Problems

[0006] (1) The recycled material for glass molding of the present invention is a material in which a recycled material recycled from a material other than glass is blended and used for molding glass. As the recycled material, it contains a recycled material derived from a molded article formed by blending an inorganic substance containing a calcium component and a material containing a thermoplastic resin at a predetermined blending ratio, and contains a calcium component derived from the molded article, that is, a recycled material derived from the molded article containing the calcium component.

[0007] According to such a configuration, a recycled material containing a calcium component derived from a molded article formed using a cereal-derived silicon component derived from cereals or an inorganic substance containing a calcium component can be utilized as a material for manufacturing glass as a recycled material for glass molding. Therefore, according to the present invention, a recycled material recycled from a material other than glass can be provided as a recycled material for glass molding that can be utilized as a material for manufacturing glass.

[0008] Here, regardless of whether the calcium component is contained in the form of calcium carbonate or calcium oxide, if the amount of calcium can be accurately controlled, glass with no quality problems can be formed. However, calcium carbonate and calcium oxide have different calcium contents per unit weight. Therefore, in the recycled material for glass forming, when the calcium component derived from the molded product is a mixture of calcium carbonate and calcium oxide, if the raw materials for glass are formulated based on the weight of the calcium component derived from the molded product, there is a high possibility that significant variations will occur in the quality of the glass produced using this. Also, generally, in view of circumstances such as limestone (calcium carbonate) being used in the glass manufacturing process, it is preferable that the recycled material for glass forming contains the calcium component in a state where it can be used without problems at the glass manufacturing site.

[0009] (2) Based on such findings, it is advisable that the above-described recycled material for glass forming according to the present invention is characterized in that the recycled material derived from the molded product contains the calcium component as calcium carbonate.

[0010] According to such a configuration, even if the raw materials for glass are formulated based on the weight of the calcium component derived from the molded product, it is possible to appropriately adjust the calcium content per unit weight, and also at the glass manufacturing site where limestone (calcium carbonate) etc. are used in the glass manufacturing process, it is possible to provide a recycled material for glass forming that can be used without problems in place of part or all of limestone etc.

[0011] (3) The manufacturing method of the recycled material for glass forming according to the present invention is a manufacturing method of a recycled material for glass forming that is blended with a recycled material regenerated from a material other than glass and is used for glass forming, and includes a step of preparing, as part or all of the recycled material, a recycled material derived from a molded product, and the recycled material derived from the molded product contains a calcium component derived from a molded product formed by blending an inorganic substance containing a calcium component and a material containing a thermoplastic resin at a predetermined blending ratio.

[0012] According to the present invention, it is possible to produce a recycled material for glass molding that contains a calcium component derived from a molded article formed using an inorganic substance containing a calcium component and can be utilized as a material for producing glass. Therefore, according to the present invention, it is possible to produce a recycled material for glass molding that can be utilized as a material for producing glass using a recycled material recycled from a material other than glass.

[0013] (4) The method for producing the recycled material for glass molding of the present invention described above preferably includes a step of obtaining a recycled material derived from the molded article that contains a calcium component contained in the molded article as a calcium component derived from the molded article by heat-treating the molded article.

[0014] According to the production method of the present invention, in the step of obtaining a recycled material derived from the molded article, it is possible to obtain a recycled material derived from the molded article that contains a calcium component contained in the molded article as a calcium component derived from the molded article, and to produce a recycled material for glass molding. Therefore, according to the present invention, it is possible to provide a production method for producing a recycled material for glass molding using a recycled material recycled from a material other than glass.

[0015] (5) The method for producing the recycled material for glass molding of the present invention described above preferably is characterized in that in the step of obtaining a recycled material derived from the molded article, the thermoplastic resin contained in the molded article is removed by thermal decomposition by directly heating or indirectly heating the molded article.

[0016] According to the production method of the present invention, in the step of obtaining a recycled material derived from the molded article, by directly heating or indirectly heating the molded article, the thermoplastic resin contained in the molded article is removed by thermal decomposition, and the purity of the calcium component contained in the recycled material derived from the molded article can be increased.

[0017] Here, as described above, in the recycled material for glass forming, regardless of whether the calcium component is contained in the form of calcium carbonate or calcium oxide, if the amount of calcium can be accurately controlled, glass with no quality problems can be formed. However, when calcium carbonate and calcium oxide are mixed, if the raw materials for glass are prepared based on the weight of the calcium component derived from the molded product, there is a high possibility that the properties of the glass formed using this will vary. Also, in view of circumstances such as limestone (calcium carbonate) being used in the glass manufacturing process, it is preferable that a recycled material for glass forming containing the calcium component in the state of calcium carbonate can be manufactured.

[0018] Furthermore, in the manufacturing method according to the present invention, when the molded product to be processed contains a thermoplastic resin, it is preferable to sufficiently remove the thermoplastic resin.

[0019] (6) Based on such findings, the manufacturing method of the recycled material for glass forming of the present invention described above is characterized in that the calcium component contained in the molded product is calcium carbonate, and in the step of obtaining the recycled material derived from the molded product, the molded product is heated in a temperature range that is higher than the temperature at which the thermoplastic resin thermally decomposes and lower than the thermal decomposition temperature of calcium carbonate.

[0020] In the manufacturing method according to the present invention, a molded article containing calcium carbonate as a calcium component is used, and the molded article is heated in a temperature range lower than the thermal decomposition temperature of calcium carbonate. Therefore, in the glass-forming recycled material obtained by the manufacturing method according to the present invention, the thermal decomposition of calcium carbonate into calcium oxide is suppressed in the manufacturing process, and the calcium component can be obtained in the state of calcium carbonate. Further, in the manufacturing method according to the present invention, in the step of obtaining a recycled material derived from the molded article, the molded article is heated under conditions at a temperature higher than the temperature at which the thermoplastic resin thermally decomposes. Therefore, according to the manufacturing method according to the present invention, a recycled material for glass molding in a state where the thermoplastic resin constituting the molded article is sufficiently removed can be obtained. Therefore, according to the manufacturing method of the present invention, a recycled material for glass molding having a low content of thermoplastic resin and containing a calcium component in the state of calcium carbonate can be manufactured.

[0021] Here, as a result of intensive studies by the present inventors, when the molded article containing a calcium component contains a thermoplastic resin, in the process of forming the calcium component (calcium component derived from the molded article) by heat treatment, the thermoplastic resin burns, As a result, the temperature of the heat treatment atmosphere may rise significantly in a short time, and it may become difficult to control the temperature during the heat treatment. Furthermore, as a result of intensive studies by the present inventors, if a treatment of thermal decomposition by heating is performed in a state of a mixture of a grain or a grain-derived product containing a silicon component and a molded article containing a calcium component, even when the molded article contains a thermoplastic resin, The finding was obtained that the thermoplastic resin is slowly thermally decomposed and the temperature control becomes easy. Further, as a result of studies by the present inventors, it has been found that the silicon component derived from grains can be used as part or all of the silicon component used in the production of glass.

[0022] (7) Based on the above findings, the method for manufacturing a recycled material for glass molding according to the present invention is to directly or indirectly heat and pyrolyze a mixture obtained by mixing a grain containing a silicon component or a grain-derived product derived from the grain, an inorganic substance containing a calcium component, and a material containing a thermoplastic resin at a predetermined blending ratio, thereby obtaining a grain-derived recycled material containing a grain-derived silicon component composed of the silicon component derived from the grain, and a molded product-derived recycled material containing the calcium component contained in the molded product as a molded product-derived calcium component. The method is characterized by having a step of obtaining a mixed recycled material to form a recycled material for glass molding.

[0023] In the manufacturing method according to the present invention, a heat treatment for pyrolyzing by heating is performed on a mixture obtained by mixing a grain or a grain-derived product containing a silicon component and a molded product containing a calcium component. Therefore, in the manufacturing method according to the present invention, while the thermoplastic resin contained in the molded product is gently pyrolyzed, a mixed recycled material containing a silicon component (grain-derived silicon component) obtained from the grain or the grain-derived product and a calcium component (molded product-derived calcium component) obtained from the molded product can be formed as a recycled material for glass molding. Also, the grain-derived silicon component can be used as a substitute for part or all of the silicon component used in the manufacture of glass. Furthermore, in the manufacturing method according to the present invention, since the heat treatment is performed in a state where a grain or a grain-derived product containing a silicon component and a molded product containing a calcium component are blended at a predetermined blending ratio, the blending ratio of the grain-derived silicon component and the molded product-derived calcium component contained in the mixed recycled material can also be appropriately controlled. Therefore, according to the manufacturing method according to the present invention, it is easy to control the temperature during the heat treatment, and a mixed recycled material in which the grain-derived silicon component and the molded product-derived calcium component are blended at an appropriate blending ratio can be manufactured as a recycled material for glass molding.

[0024] (8) The manufacturing method of the recycled material for glass molding of the present invention described above is characterized in that in the step of obtaining the mixed recycled material, the object to be heat-treated is directly or indirectly heated in a temperature range higher than the higher temperature TL of the combustion temperature T1 of the carbon component formed by thermally decomposing the organic matter contained in the grain or grain-derived material and the thermal decomposition temperature T2 of the thermoplastic resin contained in the molded product.

[0025] According to the manufacturing method of the present invention, by setting the temperature range for directly or indirectly heating the object to be heat-treated, while suppressing the residual rate of the carbon component formed by the thermal decomposition of the organic matter contained in the grain or grain-derived material, the thermoplastic resin contained in the molded product can be sufficiently thermally decomposed.

[0026] (9) The manufacturing method of the recycled material for glass molding of the present invention described above is characterized in that the calcium component contained in the molded product is calcium carbonate, and in the step of obtaining the mixed recycled material, the object to be heat-treated is heat-treated in a temperature range lower than the thermal decomposition temperature of calcium carbonate.

[0027] According to the manufacturing method of the present invention, it is possible to suppress the decomposition of calcium carbonate contained in the molded product into calcium oxide, and manufacture a recycled material for glass molding containing calcium carbonate as a calcium component derived from the molded product. Therefore, according to the manufacturing method of the present invention, even at a glass manufacturing site that uses limestone (calcium carbonate) or the like in the glass manufacturing process, it is possible to manufacture a recycled material for glass molding that can be used without problems in place of part or all of limestone or the like.

Advantages of the Invention

[0028] According to the present invention, it is possible to provide a recycled material for glass molding that can utilize a recycled material regenerated from a material other than glass as a material for manufacturing glass, a manufacturing method of the recycled material for glass molding, and a manufacturing method of glass.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0030] Hereinafter, a recycled material for glass molding, a method for manufacturing a recycled material for glass molding, and a method for manufacturing glass according to an embodiment of the present invention will be described.

[0031] ≪Regarding the recycled material for glass molding≫ The recycled material for glass molding of the present embodiment is a recycled material regenerated from a material other than glass and is used for molding glass. The recycled material for glass molding of the present embodiment can be composed only of a recycled material derived from a molded product, or can include a calcium component different from the calcium component of the recycled material derived from the molded product, a recycled material different from the recycled material derived from the molded product, and the like.

[0032] [Recycled material derived from a molded product] The recycled material derived from a molded product is a recycled material containing a calcium component derived from a molded product created using an inorganic substance containing a calcium component as the calcium component derived from the molded product. The recycled material derived from a molded product can be the one that forms all of the calcium component in the recycled material for glass molding, or can be the one that forms a part of the calcium component in the recycled material for glass molding together with other calcium components (for example, limestone, calcium carbonate reagent, calcium oxide reagent, etc.).

[0033] The molded article serving as the raw material of the recycled material derived from the molded article contains an inorganic substance containing a calcium component, and in addition to the inorganic substance, a thermoplastic resin or the like is blended at a predetermined blending ratio. For the molded article serving as the raw material of the recycled material derived from the molded article, those having various compositions and forms containing an inorganic substance containing a calcium component can be selected. For the molded article serving as the raw material of the recycled material derived from the molded article, for example, in addition to calcium carbonate, a thermoplastic resin, a molding agent, etc. are included, and lime paper formed in a sheet shape can be preferably selected. The inorganic substance constituting the recycled material derived from the molded article is preferably composed of one or more selected from the group consisting of, for example, calcium carbonate, clay, silica, titanium oxide, talc, kaolin, and aluminum hydroxide. Further, the thermoplastic resin constituting the recycled material derived from the molded article can be, for example, polyolefin resins such as polypropylene, high-density polyethylene, and low-density polyethylene, vinyl resins such as polyvinyl chloride and polystyrene, polyester resins such as polyethylene terephthalate, recycled resins, etc. The above-mentioned thermoplastic resins may be used alone as one selected from these, or may be a mixture of two or more. Further, the auxiliary agent constituting the recycled material derived from the molded article is preferably one or more selected from, for example, lubricants, coupling agents, antioxidants, ultraviolet absorbers, coloring agents, pigments for coloring, fluidity improvers, dispersants, stabilizers, antistatic agents, flame retardants, etc.

[0034] [Composition of Recycled Material for Glass Molding] The recycled material for glass molding can be composed of a single recycled material derived from a molded article containing a calcium component derived from the molded article as part or all of the calcium component. Further, the recycled material for glass molding can be, for example, a mixed recycled material in which a recycled material different from the recycled material derived from the molded article is mixed with the recycled material derived from the molded article, such as a recycled material derived from grains containing a silicon component derived from grains, so that the silicon component derived from grains is included as part or all of the silicon component, and at the same time, the calcium component derived from the molded article is included as part or all of the calcium component.

[0035] Here, when the recycled material for glass forming is the above-described mixed recycled material, it is advisable to adjust the mixing ratio of the silicon component and the calcium component in the mixed recycled material in consideration of the mixing ratio of the silicon component and the calcium component contained in the raw materials for glass production, conditions such as the color of the glass to be produced, and the like.

[0036] <<Manufacturing Method of Recycled Material for Glass Forming>> Subsequently, a manufacturing method for manufacturing the above-described recycled material for glass forming will be described. The above-described recycled material for glass forming can be manufactured from a recycled material derived from a molded article by a manufacturing method exemplified below, using a molded article containing a calcium component as a raw material (this raw material will also be referred to as a "molded article-based raw material" hereinafter). Further, in addition to the molded article-based raw material, a mixture obtained by mixing a grain containing a silicon component or a grain-derived product derived from the grain as a raw material (this raw material will also be referred to as a "grain-based raw material" hereinafter) as a raw material (this raw material will also be referred to as a "mixed raw material" hereinafter), it is also possible to manufacture a recycled material for glass forming containing a grain-derived recycled material in addition to the molded article-derived recycled material. Hereinafter, (1) a manufacturing method for manufacturing a recycled material for glass forming from a molded article-based raw material (hereinafter, also referred to as a "manufacturing method of a recycled material derived from a molded article"), and (2) a manufacturing method for manufacturing a recycled material for glass forming from a mixed raw material (hereinafter, also referred to as a "manufacturing method of a mixed recycled material") will be described.

[0037] [(1) Manufacturing Method of Recycled Material Derived from Molded Article] The method for manufacturing a recycled material derived from a molded article includes, as part or all of the manufacturing process, a step of obtaining a recycled material derived from the molded article containing a calcium component derived from the molded article (step of obtaining a recycled material derived from the molded article) by heat-treating a molded article containing a calcium component (raw material of the molded article system). The method for manufacturing a recycled material derived from a molded article can obtain a recycled material derived from the molded article containing a calcium component contained in the molded article as a calcium component derived from the molded article by directly heating or indirectly heating the molded article to thermally decompose and remove the thermoplastic resin contained in the molded article. The direct heating of the raw material derived from the molded article may be performed, for example, by directly burning the raw material derived from the molded article in a combustion furnace. Also, the indirect heating of the raw material derived from the molded article may be performed, for example, by using a heat treatment apparatus such as a rotary kiln and setting conditions so that the temperature inside the furnace reaches a predetermined temperature to heat the raw material derived from the molded article.

[0038] In the method for manufacturing a recycled material derived from a molded article, when the calcium component contained in the raw material of the molded article system is calcium carbonate, it is preferable to heat the molded article in a temperature range that is higher than the temperature at which the thermoplastic resin thermally decomposes and lower than the thermal decomposition temperature of calcium carbonate. Thereby, it is possible to suppress the thermal decomposition of calcium carbonate into calcium oxide. As a result, the recycled material derived from the molded article obtained by the method for manufacturing a recycled material derived from a molded article can be treated as a material that can be used as a raw material for glass in the same manner as limestone used in the manufacturing process of glass.

[0039] [(2) Method for manufacturing a mixed recycled material] The method for manufacturing a mixed recycled material includes, as part or all of the manufacturing process, a step (mixed recycled material acquisition step) of forming a mixed recycled material containing a grain-derived recycled material containing a silicon component and a molded product-derived recycled material containing a calcium component as a recycled material for glass molding by directly heating or indirectly heating a mixture (mixed raw material) of a grain-derived raw material and a molded product-derived raw material as an object to be heat-treated and pyrolyzing it. The direct heating of the mixed recycled raw material may be performed, for example, by igniting the grain-derived raw material contained in the mixed recycled raw material in a combustion furnace or other methods to burn the mixed recycled raw material. Also, the indirect heating of the mixed recycled raw material may be performed, for example, by using a heat treatment device such as a rotary kiln and setting the conditions so that the temperature inside the furnace reaches a predetermined temperature to heat the mixed recycled raw material.

[0040] In the method for manufacturing a mixed recycled material, the heat treatment temperature when heat-treating the mixed raw material is set in a temperature range higher than the higher temperature TL among the combustion temperature T1 of the carbon component formed by pyrolyzing the organic matter contained in the grain-derived raw material and the thermal decomposition temperature T2 of the thermoplastic resin contained in the molded product-derived raw material. Thereby, while minimizing the remaining of the carbon component generated by heat-treating the grain-derived raw material, the thermoplastic resin contained in the molded product-derived raw material can be sufficiently pyrolyzed. As a result, a recycled material for glass molding mainly composed of a silicon component and a calcium component and having a minimum content of impurities such as a carbon component can be manufactured.

[0041] In addition, in the method for manufacturing a mixed recycled material, the heat treatment temperature when heat-treating the mixed raw materials is adjusted to be in a temperature range lower than the thermal decomposition temperature of calcium carbonate. Thereby, it is possible to suppress the calcium carbonate contained in the raw material derived from the molded product from being thermally decomposed into calcium oxide. Furthermore, in a temperature range higher than the thermal decomposition temperature of calcium carbonate, there is a concern that silicon oxide forming the silicon component in the recycled material for glass molding changes from an amorphous form to a crystallized one. Whether silicon oxide is in an amorphous form or a crystallized form does not significantly affect the manufacturing quality of glass. However, since crystallized silicon oxide raises concerns such as carcinogenicity, there is a problem that it is difficult to handle in the glass manufacturing process. Therefore, in the method for manufacturing a mixed recycled material, by setting the heat treatment temperature when heat-treating the mixed raw materials to be in a temperature range lower than the thermal decomposition temperature of calcium carbonate, crystallization of silicon oxide can be suppressed, and a recycled material for glass molding containing amorphous silicon oxide that is easy to handle in the glass manufacturing process can be manufactured.

Example

[0042] Subsequently, Example 1 related to the recycled material for glass molding according to an embodiment of the present invention and the manufacturing method of the recycled material for glass molding will be described. In this example, sample A and sample B were obtained by conducting a manufacturing test on the recycled material for glass molding by the method shown below.

[0043] ≪Regarding the manufacturing test of sample A≫ Sample A is a recycled material derived from a molded product manufactured by selecting lime paper as a molded product-based raw material and heat-treating it. As the lime paper, which is a molded product-based raw material, the product name LIMEX manufactured by TBM Co., Ltd. was selected. LIMEX contains approximately 60% calcium carbonate and approximately 40% polyolefin, which is a thermoplastic resin.

[0044] Here, as shown in FIG. 1, as a result of performing TG-DTA analysis on LIMEX, it was found that LIMEX starts to decompose a polyolefin-based thermoplastic resin at 392° C. or higher and catches fire and burns at 409° C. or higher in an air atmosphere. Further, it was found that when the temperature reaches 704° C. or higher, a decomposition reaction occurs in which calcium carbonate decomposes into calcium oxide. Based on the TG / DTA analysis results of LIMEX, the lower limit value of the heat treatment temperature during the production of sample A is preferably at or above any of the temperatures of the propylene gas generation temperature (243° C.), isobutene gas generation temperature (245° C.), or propane gas generation temperature (253° C.) generated by the decomposition of the polyolefin-based thermoplastic resin, and it was found that it is even more preferable to be 409° C. or higher at which the polyolefin-based thermoplastic resin catches fire. Further, it was found that the upper limit value of the heat treatment temperature during the production of sample A is preferably less than the temperature (704° C.) at which calcium carbonate undergoes a decarboxylation reaction due to thermal decomposition. Considering the safety factor against the thermal decomposition of calcium carbonate while reliably thermally decomposing the polyolefin-based thermoplastic resin, it was found that the heat treatment of sample A should be carried out in a temperature range of 409° C. or higher and 600° C. or lower, which is sufficiently lower than 704° C.

[0045] <<Regarding the production test of sample B>> Sample B is a sample produced by heat-treating a mixed raw material obtained by mixing rice husks, which are cereal-based raw materials, and lime paper, which is a molded product-based raw material. In the production test of sample B, the same lime paper (LIMEX) as that used in the production test of sample A above was used as the molded product-based raw material. Further, in the production test of sample B, the mixing ratio of rice husks and LIMEX was adjusted so that silicon dioxide and calcium carbonate would be blended at a predetermined blending ratio after heat treatment. Specifically, in the production test of sample B, rice husks and LIMEX were mixed at a mass ratio of 14.4:1 and heat-treated so that the blending ratio of silicon dioxide and calcium carbonate would be 100:27.

[0046] In the manufacturing test of Sample B, when setting the heating conditions of the mixed raw materials, considering the ignition temperature (409°C) of the polyolefin-based thermoplastic resin contained in the lime paper, which is the molded product-based raw material, the temperature (704°C) at which calcium carbonate undergoes a decarbonation reaction due to thermal decomposition, and the decomposition temperature (528°C) of the carbon component (carbon) generated during the heating of the grain-based raw material, heat treatment was performed with temperature control so that the temperature range was 528°C or higher and less than 704°C. As a result, Sample B in which silicon dioxide and calcium carbonate were mixed was able to be formed.

[0047] Regarding the decomposition temperature of the carbon component (carbon) generated during the heating of the grain-based raw material, an Ethica Star manufactured by M.I.T. Co., Ltd. was used, and a sample obtained by directly heat-treating rice husks by combustion (hereinafter also referred to as "primary heated product") was prepared, and the decomposition temperature was derived by performing TG-DTA analysis on the primary heated product. Specifically, when TG-DTA analysis was performed on the primary heated product, results as shown in Figure 2 were obtained. When analyzing the analysis results, a weight loss due to evaporation of moisture and the like was confirmed in the temperature range of approximately 102°C to 141°C, and a weight loss due to generation of carbon dioxide was confirmed in the temperature range of approximately 420°C to 528°C. Based on this analysis result, it was found that the primary heated product contains a carbon component (carbon) associated with the heat treatment of rice husks, and the decomposition temperature of the carbon component is around 528°C. Combining such findings and the findings obtained by the TG-DTA analysis related to LIMEX shown in Figure 1 described above, the above-described heating conditions were set.

Example

[0048] An example 2 will be described in which a verification test was conducted on whether the sample of the recycled material for glass molding manufactured in Example 1 above can be used in the manufacture of glass. The glass composition of the glass created in Example 2 resulted as shown in Table 1, and the glass properties were as shown in Table 2. Further, as a result of examining the color tone of the glass for each sample, results as shown in Table 3 were obtained.

[0049]

Table 1

[0050]

Table 2

[0051]

Table 3

[0052] Specifically, in Example 2, as the sample Y of the comparative example, transparent (flint) glass was prepared without using a recycled material for glass forming. Further, as sample X1, a recycled material for glass forming obtained by heat-treating a mixed raw material in which rice husk, which is a cereal-derived raw material, and LIMEX, which is a molded product-derived raw material, were mixed at a ratio of 14.4:1 was used to replace the total amounts of silicon dioxide and calcium carbonate required for preparing the sample Y of the comparative example. Also, in Example 2, as sample X2, glass using the recycled material for glass forming according to sample A of Example 1 above was prepared. When preparing sample X2, the total amount of calcium carbonate required for preparing the sample Y of the comparative example was replaced with the recycled material for glass forming according to sample A.

[0053] As a result of the above-described glass production test, it was found that both sample X1 and sample X2 using the recycled material for glass forming could be produced as glass, similar to the sample Y of the comparative example. Further, when examining the glass composition and glass properties of samples X1, X2, and sample Y, test results as shown in Table 1 and Table 2 were obtained.

[0054] Here, considering the test results in Table 1 and Table 2, first, regarding sample X1 containing a grain-derived raw material (rice husk) in addition to a molded product-derived raw material (LIMEX in this embodiment) as a raw material for the recycled material for glass molding, the glass composition was examined. As a result, it was found that in sample X1, the contents of silicon dioxide and calcium oxide were within the allowable ranges. Specifically, it was found that the glass related to sample X1 contained silicon dioxide in the range of 71.5% or more and 73.0% or less by mass ratio, and calcium oxide in the range of 10.5% or more and 13.0% or less by mass ratio. Further, when examining iron oxide (Fe2O3), although it tends to be higher compared to sample Y which is a comparative example, as shown in Table 3, it was confirmed that it is within the allowable range (0.09% or less by mass ratio) as a glass with a transparent (flint) color tone. Thus, the tendency for iron oxide to be higher in sample X1 is considered to be due to the inclusion of iron oxide derived from the grain-derived material (rice husk) as a raw material in the glass composition.

[0055] Also, when examining the glass composition of sample X1, it was found that the composition of sulfur trioxide (SO3) in sample X1 was sufficiently lower compared to sample Y related to the comparative example. As a result, in the recycled material for glass molding obtained by heat-treating a mixed raw material in which a grain-derived raw material (rice husk in this example) and a molded product-derived raw material (LIMEX in this example) are mixed, such as sample X1, the carbon component (carbon) is sufficiently reduced. As a result, the finding was obtained that the composition of sulfur trioxide (SO3) is also low in the glass using this. Reflecting this, as shown in Table 3, it was confirmed that the glass related to sample X1 has a tendency that the chromaticity Y and the dominant wavelength λd are slightly lower and the excitation purity Pe is slightly higher compared to sample Y related to the comparative example, and the color tone is in a greenish state. Also, the glass related to sample X1 was found to have a lower temperature (MPI / high-temperature viscosity) at which the viscosity becomes 10 2 [Poise] compared to sample Y related to the comparative example.

[0056] Regarding sample X2 containing a raw material derived from a molded product (LIMEX in this example) as a raw material for a recycled material for glass forming, when the glass composition was examined, it was found that the contents of silicon dioxide and calcium carbonate were within the allowable ranges. Specifically, the allowable range of the content of silicon dioxide is in the range of 71.5% or more and 73.0% or less by mass ratio, and the allowable range of the content of calcium oxide is in the range of 10.5% or more and 13.0% or less by mass ratio. In contrast, the glass of sample X2 had a silicon dioxide content of 71.84% by mass ratio and a calcium oxide content of 11.15% by mass ratio. Also, it was confirmed that the glass related to sample X2 had an iron oxide content of 0.027% and was within the allowable range (0.09% or less by mass ratio) as a transparent (flint) glass in terms of color tone.

[0057] In Example 2, in order to make the influence on the composition and properties of glass by substitution with the recycled material for glass forming remarkable, in each sample, all of either one or both of silicon dioxide and calcium carbonate required for preparing the sample Y of the comparative example were substituted with the recycled material for glass forming. Since both sample X1 and sample X2 have glass properties suitable for forming into glass, it became clear that the recycled material for glass forming of the present invention can be preferably used to make glass. Also, from the viewpoint of making a transparent (flint) glass, both sample X1 and sample X2 can be manufactured within an acceptable range. In particular, when sample X2 containing a raw material derived from a molded product (LIMEX in this example) was used as the recycled material for glass forming, it was found that a product comparable to the case where the recycled material for glass forming was not used could be manufactured. Therefore, as in Example 2, it was found that it is possible not only to substitute all of either one or both of silicon dioxide and calcium carbonate with the recycled material for glass forming, but also to substitute a part of either one or both of silicon dioxide and calcium carbonate with the recycled material for glass forming to form glass.

Industrial Applicability

[0058] The present invention is preferably applicable when recycled materials regenerated from materials other than glass are used for the production of glass.

Claims

1. A recycled material regenerated from a material other than glass, which is a recycled material for glass molding used in glass molding, As the recycled material, It includes a recycled material derived from a molded product containing an inorganic substance containing a calcium component and a material containing a thermoplastic resin blended at a predetermined blending ratio, and includes a calcium component derived from the molded product, The recycled material derived from the molded product contains a calcium component as calcium carbonate, The recycled material derived from the molded product is such that while the thermoplastic resin is removed by thermal decomposition, the calcium component derived from the molded product maintains the form of calcium carbonate, A recycled material for glass molding, characterized by the above.

2. A method for manufacturing a recycled material for glass molding, in which a recycled material regenerated from a material other than glass is blended and used in glass molding, As the recycled material, a step of preparing a recycled material derived from a molded product as part or all of it, A step of obtaining a recycled material derived from a molded product by heat-treating the molded product to obtain a recycled material derived from the molded product containing the calcium component contained in the molded product as a calcium component derived from the molded product, and includes, The recycled material derived from the molded product contains a calcium component derived from the molded product, which is a calcium component contained in a molded product formed by blending an inorganic substance containing a calcium component and a material containing a thermoplastic resin at a predetermined blending ratio, The calcium component contained in the molded product is calcium carbonate, In the step of obtaining the recycled material derived from the molded product, heating the molded product in a temperature range higher than the temperature at which the thermoplastic resin thermally decomposes and lower than the thermal decomposition temperature of calcium carbonate, A method for manufacturing a recycled material for glass molding, characterized by the above.

3. The step of obtaining the recycled material derived from the molded product removes the thermoplastic resin contained in the molded product by thermal decomposition by directly heating or indirectly heating the molded product, The method for manufacturing a recycled material for glass molding according to claim 2, characterized by the above.

4. A mixture obtained by mixing a grain containing a silicon component or a grain-derived product derived from the grain, an inorganic substance containing a calcium component, and a material containing a thermoplastic resin at a predetermined blending ratio is directly or indirectly heated and pyrolyzed as a heat treatment object, thereby obtaining a grain-derived recycled material containing a grain-derived silicon component composed of the silicon component derived from the grain, and a molded product-derived recycled material containing the calcium component contained in the molded product as a molded product-derived calcium component. A mixed recycled material acquisition step of forming a mixed recycled material containing the recycled material as a recycled material for glass molding is provided. The method for producing a recycled material for glass molding according to claim 2, characterized in that.

5. In the step of obtaining the mixed recycled material, the heat treatment object is directly or indirectly heated in a temperature range higher than the higher temperature TL of the combustion temperature T1 of the carbon component formed by pyrolyzing the organic matter contained in the grain or the grain-derived product and the thermal decomposition temperature T2 of the thermoplastic resin contained in the molded product. The method for producing a recycled material for glass molding according to claim 4, characterized in that.

6. The calcium component contained in the molded product is calcium carbonate, In the step of obtaining the mixed recycled material, the heat treatment object is heat-treated in a temperature range lower than the thermal decomposition temperature of calcium carbonate. The method for producing a recycled material for glass molding according to claim 4 or 5, characterized in that.

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