Slurry for low-temperature hardening of porous ceramic body and method for manufacturing porous ceramic body using same

Abstract

Provided is a slurry for low-temperature hardening of a porous ceramic body, which contains a foaming agent, a binder, a cement powder and cellulose fibers. According to the slurry for low-temperature hardening of the porous ceramic body and the method for manufacturing the porous ceramic body using the slurry of the present invention, the porous ceramic body which maintains biocompatibility and osteoconductivity can be manufactured by low-temperature hardening, and stable pores are formed during foaming in the pore-forming step, so that the stability of the porous ceramic body is improved. And finally, the hardened porous body can achieve higher mechanical strength.

Description

Technical Field

[0001] The present invention relates to a slurry for low-temperature hardening of a ceramic porous body and a method for manufacturing a ceramic porous body using the slurry, and more particularly, to a slurry for low-temperature hardening of a ceramic porous body and a method for manufacturing a ceramic porous body using the slurry, which has the following characteristics. The method manufactures a ceramic porous body only through a cement hardening reaction without a high-temperature sintering process, thereby being very environmentally friendly. Background Art

[0002] A porous ceramic refers to a solid in which pores of various sizes are distributed in particles or among particles, and is also referred to as a "porous body, porous solid, or porous material".

[0003] Generally, the pore sizes of artificially manufactured ceramic porous bodies vary from about 1 μm to 10 mm, and the shapes are also diverse, and these characteristics vary depending on the manufacturing method.

[0004] According to the presence or absence of heat treatment, it can be divided into a sintered ceramic porous body and a non-sintered ceramic porous body. The most general ceramic porous bodies can be divided into a sintered particle aggregate type, a sponge type, a foam type, and a honeycomb type.

[0005] Depending on the substance of the ceramic porous body, the size and shape of the pores, it is used for various purposes such as a filter or diffusion filter, a medium catalytic monomer, a sound absorber, a DPF, a heat exchanger, a special heater, and a bone graft material or scaffold. In order to form pores of various sizes in the ceramic porous body, as shown in the following table, various pore formers are used.

[0006] A general method for manufacturing a ceramic porous body is to mix a certain amount of flux substance with ceramic particles controlled to a desired size, form them, and make the flux melt through high-temperature treatment to cause the ceramic particles to aggregate together, thereby manufacturing a porous body, or to compress and form ceramic particles of a desired particle size and then partially sinter them at a temperature lower than the sintering temperature to obtain a porous body.

[0007] The pores are generated by micropores existing inside the particles and macropores existing between the particles, and the size of the pores existing between the particles is related to the size of the raw material particles. The problem with this method is that it is difficult to effectively control the pore size and distribution of the porous body, and it is also difficult to increase the porosity to more than 50%.

[0008] On the other hand, for a bone graft material or scaffold, in order to induce more effective bone tissue regeneration than existing porous bodies, a porous body having bionic, biodegradable, a three-dimensionally interconnected porous structure, appropriate mechanical properties, bone formation induction, and bone conduction properties is required.

[0009] Mainly, methods such as the coral or sponge replication method, which is an existing method for manufacturing ceramic porous bodies, and the sacrificial template method using polymers and salts as templates are utilized. Recently, with the development of 3D printing technology, porous bodies with three-dimensional pore structures, pore sizes, shapes, and porosities can be manufactured as required. However, due to the high-temperature sintering process, the biocompatibility and osteoconductivity decrease, and thus the new bone regeneration is significantly lower than that of autologous bone or allogeneic bone.

[0010] In addition, due to the current development of 3D printing technology and low-temperature engineering technology, porous bodies with excellent biocompatibility can be manufactured. However, the technology of directly foaming ceramic slurries and the low-temperature hardening technology are more economical than the 3D printing technology, and the manufacturing process is also simpler. The problems with the existing technology that combines the direct foaming method and the low-temperature hardening process are that stable pores need to be formed during foaming, and the mechanical strength is low after sintering. To overcome these problems, first, it is necessary to improve the shape and stability of the pores in the wet porous body during the foaming of the ceramic slurry. Second, it is necessary to increase the technology for finally improving the mechanical strength of the porous body by replacing the existing high-temperature sintering or high-temperature high-pressure at room temperature.

[0011] Therefore, according to the current global environmental regulations and the requirements for excellent biocompatibility products, a technology is needed that can manufacture ceramic porous bodies that maintain biocompatibility and osteoconductivity through low-temperature hardening, compared to manufacturing methods including the existing high-temperature sintering process, and a slurry for low-temperature hardening of ceramic porous bodies that can form stable pores during the foaming in the pore formation step, and a method for manufacturing ceramic porous bodies using the slurry.

[0012] Prior Art Documents

[0013] Patent Documents

[0014] Korean Patent Publication No. 10-2016-0113594 (September 30, 2016) Summary of the Invention

[0015] An object of the present invention is to provide a slurry for low-temperature hardening of ceramic porous bodies and a method for manufacturing ceramic porous bodies using the slurry, which have the following characteristics: stable pores are formed during foaming in the pore formation step.

[0016] The problems to be solved by the present invention are not limited to the above-mentioned problems. For other problems not mentioned, those skilled in the art to which the present invention pertains can clearly understand from the following description.

[0017] According to a first aspect of the present invention for achieving the above object, there is provided a slurry for low-temperature hardening of ceramic porous bodies including foaming agents, cement powder, and cellulose fibers.

[0018] Preferably, the foaming agent is characterized in that it may be at least one of propyl gallate, butyl gallate, hexyl amine, butyric acid, lauryl betaine or coco-betaine.

[0019] Preferably, the binder is characterized in that it may be a hydrogel including one or more selected from alginate, carrageenan, agar, PVA, PVP, and PEO.

[0020] Preferably, it is characterized in that it may be a cement powder selected from apatite cement, type B apatite cement, octacalcium phosphate (OCP) cement or Portland cement of the cement powder.

[0021] According to the second aspect of the present invention for achieving the above object, there is provided a method for manufacturing a ceramic porous body having the following characteristics, the method comprising: a slurry manufacturing step of mixing a solution containing a cement powder and a binder to manufacture a slurry; a foaming agent adding step of adding a foaming agent to the slurry; a slurry manufacturing step for low-temperature hardening of a porous body of manufacturing a ceramic for low-temperature hardening of an air body by adding a cellulose fiber to the slurry added with the foaming agent; a foaming step of stirring the slurry for low-temperature hardening of the ceramic porous body to form pores; a preliminary porous body manufacturing step of pouring the slurry for low-temperature hardening of the ceramic porous body after the foaming step into a mold and then hardening the cement to manufacture a preliminary porous body; a crosslinking step of performing crosslinking to improve the mechanical strength of the spare porous body; and a drying step of drying the porous body manufactured by the crosslinking.

[0022] Preferably, the crosslinking step is characterized in that the prefabricated porous body is accommodated in a solution containing divalent or trivalent cations for carrying out.

[0023] Preferably, the prefabricated porous body manufacturing step is characterized in that it is carried out at 35 to 80 °C.

[0024] Preferably, the drying step is characterized in that it is carried out at 35 to 50 °C.

[0025] According to the slurry for low-temperature hardening of the ceramic porous body of the present invention and the manufacturing method of the ceramic porous body using the slurry, a ceramic porous body maintaining biocompatibility and osteoconductivity can be manufactured by low-temperature hardening, and stable pores can be formed during foaming in the pore formation step. Description of the Drawings

[0026] Figure 1Show the pore formation and porous body shape that vary with the amount of binder added at a certain P / L ratio (= 0.6) according to an embodiment of the present invention.

[0027] Figure 2 Show the comparison of the pore shape change and the fracture surface of the porous body with the addition amount of the foaming agent at a certain P / L ratio (= 0.6) and the amount of binder (= 1.0 wt%) according to an embodiment of the present invention.

[0028] Figure 3 It is a photograph showing the characteristics of the OCP porous body that vary with the P / L ratio in a slurry with a certain content of binder (1.0 wt% alginate) and foaming agent (0.5 wt% theobromine) according to an embodiment of the present invention.

[0029] Figure 4 It is a photograph showing the characteristics of the OCP porous body that vary with the content of the foaming agent in a slurry with a certain content of binder (1.0 wt% alginate) and P / L ratio according to an embodiment of the present invention. Detailed Description of the Invention

[0030] The foregoing and additional aspects are embodied by the embodiments described with reference to the accompanying drawings. It can be understood that as long as there is no other mention or contradiction among them, the constituent elements of each embodiment can be combined in various ways within the embodiment or with the constituent elements of other embodiments. The inventor should, in order to best explain his invention, interpret the terms used in this specification and the claims in accordance with the meaning and concept that conform to the recorded content or the proposed technical idea, based on the principle of appropriately defining the term concepts.

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments described herein and can be embodied in other forms. On the contrary, the embodiments introduced here are provided to thoroughly, completely and fully convey the idea of the present invention to those skilled in the art to which the present invention pertains. Throughout the specification, the same reference signs denote the same components. Components with the same or similar reference signs perform the same or similar functions, so the description can be omitted. For the components with the reference signs omitted from the description, reference can be made to the description of the components with the same or similar reference signs above.

[0032] To achieve the above object, the invention according to the first aspect provides a slurry for low-temperature hardening of a ceramic porous body, the slurry comprising a foaming agent, a binder, cement powder, and cellulose fiber.

[0033] Stable pores can be formed due to the inclusion of the foaming agent.

[0034] It can increase pore formation or stability due to the inclusion of a binder and can improve mechanical strength.

[0035] Due to the inclusion of the cement powder, the ceramic porous body can be manufactured through a cement hardening reaction and can be manufactured at a low temperature without a sintering step.

[0036] The ceramics made from the cellulose fiber can increase the shape and stability of pores. Specifically, by adding cellulose, the low mechanical strength and pore stability of the wet porous body, which has problems when directly foaming the existing ceramic slurry, are solved by a relatively simple method, and the results of improving mechanical strength and pore stability are also obtained in the cemented porous body.

[0037] Preferably, the foaming agent is characterized in that it can be at least one of propyl gallate, butyl gallate, hexyl amine, butyric acid, valeric acid, lauryl betaine or coco-betaine.

[0038] The foaming agent is characterized in that it can be at least one of propyl gallate, butyl gallate, hexyl amine, butyric acid, valeric acid, lauryl betaine or coco-betaine. Thus, through a surface treatment process that changes the surface of the cement particles from hydrophilic to hydrophobic, the hydrophilic part of the amphiphilic foaming agent adheres to the surface of the hydrophilic cement particles to form a layer, making the cement particles appear hydrophobic from the outside, which helps to form stable pores. At this time, any foaming agent can be used, but in the present invention, coco-betaine is used as the foaming agent.

[0039] Preferably, the addition amount of coco-betaine is 0.2 to 0.7 parts by weight relative to 100 parts by weight of the binder solution. Most preferably, 0.5 parts by weight is the most effective. When the addition amount of the foaming agent is less than 0.2% by weight, only part of the cement particles become hydrophobic, resulting in poor pore formation of the pores. When it exceeds 0.7 parts by weight, there are a large number of foaming agents that are not attached to the cement particles, so the stability of the porous body is significantly reduced, and cracks or collapses occur after drying.

[0040] Preferably, the binder is characterized in that it can be one or more hydrogels selected from alginate, carrageenan, agar, PVA, PVP, and PEO.

[0041] The binder is one or more hydrogels selected from alginate, carrageenan, agar, PVA, PVP, and PEO, so that the pore formation or stability of the pores of the moisture-containing porous body or the porous body after low-temperature hardening can be improved, and the mechanical strength can be improved.

[0042] In the present invention, Na-alginate is added to distilled water at a weight ratio of 1.0% as an adduct additive to prepare an adduct solution. The addition amount of Na-alginate can reach 0.5 to 2.0% relative to the weight of the cement powder, and preferably, the weight ratio is 1%. At this time, when no Na-alginate is added or the added content is less than 1%, the pore formation or stability of the pores significantly decreases, cracks appear after drying, and finally the porous body collapses due to low strength.

[0043] In addition, if the addition amount is more than 2.0%, due to a large amount of Na-alginate, it is possible to reduce osteoconduction or biocompatibility. In this example, the binder solution was made into octacalcium phosphate powder (α-TCP and NaH2PO4, refer to Patent Application No. 10-2021-0157523), and after adding it in an amount of P / L = 0.6, mixing was carried out. The mixing weight ratio (P / L ratio) of the cement powder and the binder solution varies slightly depending on the powder type, but when the octacalcium phosphate powder is mixed with the alginate solution, the mixing weight ratio is 0.2 to 0.9, preferably 0.5 to 0.7, and the effect is 0.6.

[0044] Preferably, it is characterized in that it can be one type of cement powder selected from the apatite cement, type B apatite cement, octacalcium phosphate (OCP) cement, or Portland cement of the cement powder. The cement powder refers to a compound other than H2O in the main raw materials and reactants, rather than the final substances in Table 1 below.

[0045] (Table 1)

[0046]

[0047]

[0048] In order to achieve the above object, according to a second aspect of the present invention for achieving the above object, there is provided a method for manufacturing a porous ceramic body having the following characteristics, the method comprising: a slurry manufacturing step of mixing a solution containing cement powder and a binder to manufacture a slurry; a foaming agent adding step of adding a foaming agent to the slurry; a slurry manufacturing step for low-temperature hardening of a porous body of manufacturing a ceramic for low-temperature hardening of an air body by adding cellulose fibers to the slurry to which the foaming agent has been added; a foaming step of stirring the slurry for low-temperature hardening of the porous ceramic body to form pores; a preliminary porous body manufacturing step of pouring the slurry for low-temperature hardening of the porous ceramic body after the foaming step into a mold and then hardening the cement to manufacture a preliminary porous body; a crosslinking step of performing crosslinking in order to improve the mechanical strength of the spare porous body; and a drying step of drying the porous body manufactured by the crosslinking.

[0049] Preferably, the crosslinking step is characterized in that the preliminary porous body may be included in a solution containing divalent or trivalent cations.

[0050] The crosslinking step is performed by immersing the preliminary porous body in a solution containing divalent or trivalent cations, thereby improving the mechanical properties of the porous body.

[0051] Preferably, the preliminary porous body manufacturing step is characterized in that it can be carried out at 35 to 80 °C.

[0052] The step of manufacturing the porous body system is carried out at 35 to 80 °C, so that the cement hardening reaction takes place at a relatively low temperature. Within this temperature range, the higher the temperature, the faster the hardening reaction occurs.

[0053] Preferably, the drying step is characterized in that it can be carried out at 35 to 50 °C. The drying step can increase the mechanical strength of the porous body hardened at a low temperature by being carried out at 35 to 50 °C.

[0054] Hereinafter, the present invention will be described in more detail by way of examples. However, it should not be construed that the present invention is limited by the following examples.

[0055] Example 1 - Manufacture of Slurry for Low-Temperature Hardening of Ceramic Porous Body

[0056] The manufacturing process of the slurry for low-temperature hardening of the porous ceramic body is as follows.

[0057] (1) A slurry manufacturing step of mixing a solution containing cement powder and a binder to manufacture a slurry:

[0058] In the step of mixing an aqueous solution containing a binder in the cement mixed powder, while adjusting the solution (L) ratio (P / L ratio) according to the weight (P) of the cement powder, the organic binder solution is mixed into the cement powder.

[0059] In the present invention, Na-alginate is added to distilled water at a weight ratio of 1.0% to make an adduct solution as an adduct additive. For the weight of the cement powder, the addition amount of Na-alginate can reach 0.5 to 2.0%, and preferably, the weight ratio is 1%. At this time, when Na-alginate is not added or the content is less than 1%, the pore formation or stability significantly decreases, and cracks appear after drying. Eventually, low strength leads to the collapse of the porous body. In addition, when the addition weight ratio is more than 2.0%, the osteoconduction or biocompatibility may be reduced due to a large amount of Na-alginate.

[0060] In this example, the stirring solution is added to the octacalcium phosphate powder (α-TCP and NaH2PO4) at a level of P / L = 0.6 and then mixed. The mixing weight ratio (P / L ratio) of the cement powder and the stirring solution varies slightly depending on the type of powder. When the octacalcium phosphate powder is mixed with the alginate solution, referring to Figure 1 , the mixing weight ratio is 0.2 to 0.9, preferably 0.5 to 0.7, and 0.6 is the most effective.

[0061] (2) Step of adding a foaming agent to the slurry:

[0062] Theobromine is used as the foaming agent. Referring to Figure 2 , preferably, the addition amount of the theobromine binder is 0.2 to 0.7 parts by weight relative to 100 parts by weight of the binder solution. Most preferably, 0.5 parts by weight is the most effective. When the addition amount of the foaming agent is less than 0.2 parts by weight, only part of the cement particles turn hydrophobic, resulting in poor pore formation of the gas pores. When it exceeds 0.7 parts by weight, there is a large amount of foaming agent that is not attached to the cement particles, so the stability of the formed porous body significantly decreases, and cracks or collapse phenomena occur after drying.

[0063] After the aqueous slurry is made with the solution of the additive and the foaming agent, it has a stable microporous shape and pore structure of the porous body, and the drying strength is good. When the content of the foaming agent is lower than the proposed mixing ratio (<0.2%), the air pores become smaller. When the content is higher (>0.9%), the air pore size increases due to high viscosity, resulting in the problem of weakened strength of the porous body. Therefore, it is crucial to adjust the foaming agent and the P / L ratio to obtain the required pore size and porosity (refer to Figure 3 ).

[0064] (3) Step of manufacturing a ceramic porous body low-temperature hardening slurry by adding cellulose fibers to the slurry of the foaming agent:

[0065] Cellulose fiber input step: Well-dispersed commercial micrometer- or nanometer-sized cellulose fibers are added to the slurry. At this time, the addition amount of cellulose can vary according to the cellulose fiber content in the commercial product, and the cellulose fiber content used in the present invention can be increased by 0.1 to 4.0 parts by weight. However, when in the range of 0.2 to 0.4 parts by weight, pores are formed while observing no caking phenomenon between the cellulose fibers. When deviating from the said range, pore collapse phenomenon is observed due to uneven dispersion, and thus the mechanical strength is reduced instead.

[0066] Example 2 - Manufacture of Ceramic Porous Body

[0067] (1) Foaming step of forming pores by stirring the slurry for low-temperature hardening of the ceramic porous body:

[0068] Stirring and foaming step: The slurry added with cellulose is stirred at room temperature using a stirrer to uniformly disperse the cellulose and form the desired pore size. Air is introduced into the slurry during stirring to form pores. This step is the foaming step of forming pores. The introduced air is hydrophobic and separates from water, and through surface treatment, hydrophobic cement particles adhere around the air droplets, resulting in the formation of a cement particle layer outside the air droplets. When pores are formed, the injection of air varies according to the stirring speed and time. Using this, the pore size, shape, and distribution can be easily adjusted. In the present invention, pores of about 500 to 700 micrometers in size are formed by stirring for 2 to 10 minutes. Preferably, it is carried out for 4 to 6 minutes, and most preferably, it is carried out for 5 minutes. That is, when carried out under the optimized foaming conditions, a ceramic porous body with pore shape stability and desired size and distribution can be obtained.

[0069] (2) Preliminary porous body manufacturing step of manufacturing a preliminary porous body by pouring the slurry for low-temperature hardening of the ceramic porous body after the foaming step into a mold and then hardening the cement:

[0070] The forming and cement reaction step is a process of pouring the foamed slurry into a required mold and hardening it through cement reaction in a thermo-hygrostat. In the present invention, in order to carry out the cement reaction, the temperature of the thermo-hygrostat is adjusted to 37 to 80 °C at a constant relative humidity (95% RT), and the reaction time is 2 to 6 hours. That is, under the constant humidity condition, preferably, the reaction temperature range is 37 to 80 °C, and the most preferably temperature is 70 °C, and the reaction time is 2 hours.

[0071] (3) Crosslinking step carried out to improve the mechanical strength of the preliminary porous body:

[0072] In the cross-linking step, after demolding the porous body after the cement reaction is completed, in order to enhance the strength of the porous body, a process of cross-linking Na-alginate by soaking it in a calcium ion solution. In the step of mixing cement powder and a stirrer solution, the organic stirrer solution contains Na-alginate at ) wt%. Washing the aluminate by soaking it in a heavy ion solution for cross-linking can improve the mechanical properties of the porous body. At this time, various divalent or trivalent ion solutions can be used. In this embodiment, calcium chloride (CaCl2) or calcium acetate (Ca(C2H3O2)2) is used as the calcium ion source to wash calcium with distilled water. Prepare a solution of calcium acetate to 6 wt%, preferably, prepare a 4 wt% solution for use. At this concentration, the cross-linking time is 2 to 10 minutes, preferably, carry out for 5 minutes at room temperature. If the calcium ion concentration is too low, sufficient cross-linking cannot be achieved. When cross-linking sufficiently, a higher compressive strength than the uncross-linked porous body can be obtained. After cross-linking, soak in distilled water for 24 hours, and then carry out cleaning.

[0073] (4) Step of drying the cross-linked standby porous body:

[0074] In the drying step, immerse the cement porous body cleaned after the cross-linking step in a dryer and dry at 40 °C for 24 hours. Although the mechanical strength of this cement porous body is lower than that of the body when manufactured by the high-temperature sintering method, it can be carried out by a low-temperature process, thus having the advantages of being able to carry bioactive substances or drugs, etc. In addition, it is characterized in that it can be applied to bone transplantation or scaffolds due to excellent biocompatibility and osteoconductivity, and can be machined.

[0075] Experimental Example

[0076] Figure 1 It is a graph showing the change in pore formation and porous body shape with the addition amount of the binder at a certain P / L ratio (=0.6) according to an embodiment of the present invention. Refer to Figure 1 , when the weight octacalcium phosphate mixed powder (α-TCP and NaH2PO4) is mixed in a constant mixing ratio with the amount of the alginate aqueous solution by weight at P / L = 0.6 and the addition amount of the foaming agent is constant at 0.5 wt%, and the content of alginate as the binder in its aqueous solution is different at 0.5 wt% and 1 wt% respectively, the 1.0 wt% aqueous solution shows excellent pore shape and drying strength.

[0077] Figure 2 It shows a comparison of the pore shape change and the fracture surface of the porous body with the addition amount of the foaming agent at a certain P / L ratio (=0.6) and the amount of the binder (=1.0 wt%) according to an embodiment of the present invention. Refer to Figure 2, when the octacalcium phosphate mixed powder has a certain amount of binder (=1.0 wt%) and P / L ratio (=0.6) by weight, when the blowing agent contents are 0.3 wt% and 0.5 wt% respectively, 0.5 wt% shows excellent pore shape and dry strength.

[0078] Figure 3 is a photograph showing the characteristics of OCP porous bodies varying with the P / L ratio in a slurry with a certain binder (alginate 1.0 wt%) content and blowing agent (theobromine 0.5 wt%) content according to an embodiment of the present invention. Refer to Figure 3 , from the upper - end figures in sequence are the optical micrograph of the dried octacalcium phosphate porous body after demolding, the micrograph of the fracture surface of the hardened OCP porous body, the scanning electron micrograph, and the x - ray diffraction analysis (XRD) results. The obtained results vary slightly at different P / L ratios. The biggest difference is the pore size and porosity of the OCP porous body. Under the condition of a high P / L ratio or liquid phase amount (0.7), small pores and low porosity are obtained. When the P / L ratio is 0.6, the desired pore size (about 200 to 400 μm) and porosity (>60%) are obtained. Here, the final phase of the OCP porous body finally hardened by the cement reaction is composed of OCP (>60%), HA (>20%) and other phases, and it can be confirmed that it is independent of the manufacturing conditions of the water slurry.

[0079] Figure 4 is a photograph showing the characteristics of OCP porous bodies varying with the blowing agent content in a slurry with a certain binder (alginate 1.0 wt%) content and P / L ratio according to an embodiment of the present invention. Refer to Figure 4 , from the upper - end figures in sequence are the optical micrograph of the dried octacalcium phosphate porous body after demolding, the optical micrograph of the fracture surface of the hardened OCP porous body, the scanning electron micrograph and the x - ray diffraction analysis (XRD) results. The obtained results vary slightly with different blowing agent addition amounts. The biggest difference is the pore size of the OCP porous body. Under the condition of a blowing agent addition amount of 0.4 wt%, a stable pore shape is obtained, but when the addition amount is 0.3 wt%, stable and slightly larger pores (about 300 to 500 μm) are obtained. Here, the final phase of the OCP porous body finally hardened by the cement reaction is composed of OCP (>60%), HA (>20%) and other phases, and it can be determined that it is independent of the manufacturing conditions of the water slurry.

[0080] The present invention has been illustrated by the embodiments with reference to the drawings, but is not limited thereto, and should be interpreted as including various modifications that those skilled in the art can derive from these. The claims are intended to cover these modifications.

Claims

1. A slurry for low-temperature hardening of a porous ceramic body, characterized in that, Comprising: A slurry for low-temperature hardening of a ceramic porous body including foaming agent, cement powder, and cellulose fiber.

2. The slurry for low-temperature hardening of a ceramic porous body according to claim 1, wherein: The foaming agent includes at least one of propyl gallate, butyl gallate, hexylamine, butyric acid, valeric acid, lauryl betaine, or theobromine.

3. The slurry for low-temperature hardening of a ceramic porous body according to claim 1, wherein: The binder is characterized in that it can be one or more hydrogels selected from alginate, carrageenan, agar, PVA, PVP, and PEO.

4. The slurry for low-temperature hardening of a ceramic porous body according to claim 1, wherein: One type of cement powder selected from apatite cement, B-type apatite cement, octacalcium phosphate (OCP) cement, or Portland cement of the cement powder.

5. A method for manufacturing a porous ceramic body, characterized in that, Comprising: A slurry manufacturing step of mixing a solution containing cement powder and a binder to manufacture a slurry; A foaming agent adding step of adding a foaming agent to the slurry: A slurry manufacturing step for low-temperature hardening of a porous body, adding cellulose fiber to the slurry added with the foaming agent to manufacture a ceramic for a slurry for low-temperature hardening of an air body; A foaming step of stirring the slurry for low-temperature hardening of the ceramic porous body to form pores; A preliminary porous body manufacturing step of pouring the slurry for low-temperature hardening of the ceramic porous body after the foaming step into a mold and then hardening the cement to manufacture a preliminary porous body; A crosslinking step of performing crosslinking to improve the mechanical strength of the spare porous body; And a drying step of drying the porous body manufactured by the crosslinking.

6. The slurry for low-temperature hardening of a ceramic porous body according to claim 5, wherein: The crosslinking step is performed by immersing the preliminary porous body in a solution of divalent or trivalent cations.

7. The slurry for low-temperature hardening of a ceramic porous body according to claim 5, wherein: The preliminary porous body manufacturing step is performed at 35 to 80 °C.

8. The slurry for low-temperature hardening of a ceramic porous body according to claim 5, wherein: The drying step is performed at 35 to 50 °C.

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