KR102131564B1 - sleeve and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a sleeve and a method of manufacturing the same. More specifically, the present invention may provide a sleeve manufacturing method comprising: a mixing step of mixing raw materials to prepare a mixture; a forming step of forming the mixture by shooting the same into a mold under an air pressure; a curing step of curing the formed mixture by spraying CO_2 gas thereto; a demolding step of demolding the cured mixture from the mold; and a drying step of drying the demolded mixture. In addition, the present invention may provide a sleeve manufactured thereby, which comprises a heating material, a curing material, and a weight-reducing material, wherein the heating material includes one or more from among silicon dioxide (SiO_2), Al powder, haematite (Fe_2O_3), and Al_2F_6; the curing material includes water glass and urea resin; and the weight-reducing material includes one or more from among rice husk ash (RHA), cenosphere, and water glass.

Description

Sleeve and its manufacturing method{sleeve and method of manufacturing the same}

The present invention relates to a sleeve and a method for manufacturing the same, and more specifically, by drying an existing wet process, it is possible to produce a product having an accurate dimension, as well as to increase heat generation or heat retention and productivity, reduce manufacturing cost, and reduce the manufacturing cost. Compared to the waste water is not generated, the working environment is improved, and a method for manufacturing the same.

Heated sleeves are used to prevent shrinkage defects in the production of cast steel castings.The design of the hot water on the upper part of the cast steel casting device and the heating sleeve placed on the hot water to delay the solidification of the hot water casting to prevent the shrinkage defects of the cast steel casting. Can be prevented.

Insulating sleeves are used to delay hot-press cooling in cast iron (mainly BCI) castings whose melting point is lower than that of cast steel, and the heating sleeve and the insulating sleeve can be manufactured in the same production process.

As an example, a utility model room 1981-0000246 bar insulation heat insulating sleeve has been disclosed.

Most of these conventional sleeves are manufactured using a manufacturing method in which water and raw materials are mixed with a curing agent (such as a thermosetting resin), molded, and then dried and cured at a high temperature.

However, when using the above manufacturing method, there is a problem that the productivity is low and the working environment is poor by using water, and drying time and power cost are high by drying at a high temperature.

In order to solve these problems, by developing air forming and gas curing without using water, the manufacturing cost is reduced through short drying at a low temperature and the production cost is reduced and the technology for manufacturing the sleeve and a method for manufacturing the same are developed. Did.

The present invention was devised to solve the above problems, and by drying the existing wet process, not only can the product of the correct dimensions be produced, but the process is made through air forming and gas curing without using water. The purpose is to provide a sleeve with improved productivity and heat generation or heat retention and an improved working environment because no waste water is generated compared to existing processes.

In order to solve the above problems, a sleeve manufacturing method according to a first embodiment of the present invention comprises a mixing step of mixing a raw material to prepare a mixture; A molding step of forming the mixture by shooting the mold with air pressure; A curing step of curing by spraying CO ₂ gas onto the molded mixture; It is possible to provide a sleeve manufacturing method comprising a demolding step of demolding the cured mixture from the mold and a drying step of drying the demolded mixture.

Here, the raw material is characterized in that it comprises a heating material, a feedstock, a curing raw material and a lightweight material.

In addition, the heating material is Al powder and Al ₂ F ₆ And one or more of silicon dioxide (SiO ₂ ) and hematite (Fe ₂ O ₃ ), and the hardened raw materials include soda silicate (Water Glass) and urea resin (Urea Resin). It is characterized in that it comprises at least one of Rice Husk Ash (RHA), Senosphere (Cenosphere) and pearlite (pearlite).

In addition, the mixing step is Al powder 20 ~ 26 parts by weight, Al ₂ F ₆ 2.5 ~ 3.5 parts by weight of silicon dioxide (SiO ₂₎ 20 ~ 26 parts by _weight, hematite _{(Fe 2 O 3) 20 ~} 26 parts by weight of silicic acid Water Glass 17~25 parts by weight, Urea Resin 2.5~3.5 parts by weight Rice Husk Ash (RHA) 4~6 parts by weight, Cenosphere 4~6 parts by weight, and pearlite 4 It is characterized by preparing a mixture by mixing ~6 parts by weight.

In addition, the drying step is characterized in that the molded mixture is dried at 100 ~ 120 ℃ for 30 minutes ~ 2 hours.

In addition, the raw material is characterized in that it further comprises a pitch-based (pitch-based) carbon fiber.

In addition, the mixing step is characterized in that to prepare a mixture by further mixing the pitch-based (pitch-based) carbon fiber 2.5 to 3.5 parts by weight.

In addition, the raw material is characterized in that it further comprises an acrylic emulsion.

In addition, after the demoulding step, may further include an injection step of spraying a mixture of urea on the surface of the demolded mixture.

In addition, the urea mixture is characterized in that it is prepared by mixing a urea resin (Urea Resin) and water in a weight ratio of 1:1.

In addition, the raw material of the sleeve manufacturing method according to the second embodiment of the present invention is characterized in that it comprises alumina, silica sand, soda silicate (Water Glass) and lightweight materials.

Here, the lightweight material is characterized in that it comprises at least one of Rice Husk Ash (RHA), Senosphere (Cenosphere) and pearlite (pearlite).

In addition, the mixing step is characterized in that the mixture is prepared by mixing 5 to 15 parts by weight of the alumina, 20 to 35 parts by weight of silica sand, 17 to 35 parts by weight of soda silicate, and 20 to 35 parts by weight of Rice Husk Ash (RHA). .

In addition, the sleeve according to the first embodiment of the present invention includes a heating material, a feedstock, a curing raw material and a lightweight material, wherein the heating raw material is Al powder and one or more of Al ₂ F ₆ , the feedstock comprises at least one of silicon dioxide (SiO ₂ ) and hematite (Fe ₂ O ₃ ), the hardened raw material is soda silicate (Water Glass) and Urea Resin (Urea Resin), the lightweight material may provide a sleeve comprising one or more of Rice Husk Ash (RHA), Senosphere (Cenosphere) and pearlite (pearlite).

In addition, the sleeve according to the second embodiment of the present invention includes alumina, silica sand, soda silicate (Water Glass) and a lightweight material, wherein the lightweight material is Rice Husk Ash (RHA), cenosphere (Cenosphere) and pearlite (pearlite). ) Can be provided.

According to the sleeve and its manufacturing method according to the present invention constituted as described above, by shooting the mixture with air pressure, molding it, and curing it through CO ₂ gas injection to manufacture the sleeve, it is possible to produce a product of the correct dimensions, thereby producing high productivity. Eggplant has an effect.

In addition, it has the effect of having a high heat retention or heat generation function through weight reduction.

In addition, soda silicate (Water Glass) coats the surface of the cured mixture, so it has an effect of having low hygroscopicity.

In addition, drying at a low temperature for a short time has an effect of reducing the drying time and cost.

In addition, since it has high impact resistance, it has an effect of preventing cracks from occurring inside the sleeve.

In addition, compared to the existing wet process, the wastewater is not generated and the working environment can be improved.

1 is a flow chart of a sleeve manufacturing method according to the first and second embodiments of the present invention.

Hereinafter, the description of the present invention with reference to the drawings is not limited to a specific embodiment, and various conversions may be applied and various embodiments may be provided. In addition, it should be understood that the contents described below include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention.

In the following description, terms such as first and second are terms used to describe various components, and are not limited in meaning to themselves, and are used only to distinguish one component from other components.

The same reference numerals used throughout this specification denote the same components.

The singular expression used in the present invention includes the plural expression unless the context clearly indicates otherwise. In addition, terms such as “include”, “have” or “have” described below are intended to designate the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. It should be interpreted and understood to not preclude the existence or addition possibility of one or more other features, numbers, steps, actions, components, parts or combinations thereof.

According to the present invention, a process is performed through air forming and gas curing without using water to improve the existing wet process, thereby making it dry, having high productivity, exothermic or thermal insulation, low hygroscopicity, and low manufacturing cost. It is intended to provide a sleeve and a method for manufacturing the improved working environment because it is reduced and does not generate wastewater compared to existing processes. Here, the sleeve may be a heat-generating sleeve and a heat-insulating sleeve, which will be described separately in the first and second embodiments according to the type of sleeve, respectively.

Hereinafter, a sleeve and a method for manufacturing the same according to a preferred embodiment of the present invention will be described in detail with reference to FIG. 1 attached.

1 is a flow chart of a sleeve manufacturing method according to the first and second embodiments of the present invention.

As shown in Figure 1, the sleeve manufacturing method according to the first embodiment of the present invention is a method of manufacturing a heating sleeve, mixing step (S100), forming step (S200), curing step (S300), demoulding step ( S400), a spraying step (S450) and a drying step (S500).

First, the mixing step (S100) is a step of mixing the raw materials to prepare a mixture, wherein the raw materials are heat generating raw materials for heating, feedstock supplying oxygen so that the heating raw materials can generate heat, curing raw materials for curing, brittleness It may contain a lightweight material for reducing, reducing the weight and improving heat generation.

Specifically, the heating material is Al powder and Al ₂ F ₆ And one or more of silicon dioxide (SiO ₂ ) and hematite (Fe ₂ O ₃ ), and the hardened raw materials include soda silicate (Water Glass) and urea resin (Urea Resin). It may contain, and the lightweight material comprises one or more of Rice Husk Ash (RHA), Senosphere (Cenosphere) and pearlite (pearlite), the raw material may be made, but it is most preferable to include all materials.

Al powder and Al ₂ F ₆ are exothermic when combined with oxygen, and can exert a heating function on the sleeve.

Here, Al powder is preferable to use No. 2 because the surface strength and product strength of the sleeve may vary depending on the particle size.

Silicon dioxide (SiO ₂ ) and hematite (Fe ₂ O ₃ ) may serve as a source for supplying oxygen so that the exothermic raw material can generate heat by combining with oxygen.

Soda silicate (Water Glass) can be hardened due to the reaction with CO ₂ gas to enhance the strength of the sleeve and lower the hygroscopicity.

Urea resin (Urea Resin) corresponds to a liquid thermosetting resin, it can increase the product strength of the sleeve.

Rice Husk Ash (RHA) occurs when rice chaff is generated during the rice cleaning process, and can be used to reduce the brittleness of the elongated sleeve by CO ₂ gas spray hardening, and it can improve light weight and heat generation. In this case, it is preferable to use a high carbon chaff having a carbon content of 40% or more in order to increase heat generation among chaff, high carbon chaff, and chaff chaff, but is not limited thereto. This is because the high carbon content promotes the exothermic reaction more, and the particle size is larger than other rice husks, so it has good exothermic properties and can further reduce the amount of urea resin used.

Cenosphere is a heat insulating material extracted from fly ash from a thermal power plant, and is mainly formed of silica and alumina, and is a lightweight inert inert sphere filled with air or an inert gas, and can be used to lighten the sleeve and improve heat generation. .

Pearlite (pearlite) is manufactured by expanding the ore at 2000°C or higher, and is a lightweight material with many voids and low specific gravity, and can be used to lighten the sleeve and improve heat generation.

Accordingly, in the mixing step (S100), a mixture may be prepared by mixing a heating material, a feed material, a curing material, and a light weighting material. 2.5 to 29.5 parts by weight of the heating material, 20 to 52 parts by weight of the feed material, and 19.5 to 28.5 parts by weight of the curing material. The mixture can be prepared by mixing 4 to 18 parts by weight of the part and the lighter material.

Preferably, Al powder 20 ~ 26 parts by weight, Al ₂ F ₆ 2.5 ~ 3.5 parts by weight of silicon dioxide (SiO ₂₎ 20 ~ 26 parts by _weight, hematite _{(Fe 2 O 3) 20 ~} 26 parts by weight of sodium silicate ( Water Glass) 17-25 parts by weight, Urea Resin 2.5~3.5 parts by weight Rice Husk Ash (RHA) 4-6 parts by weight, Cenosphere 4-6 parts by weight, and pearlite 4-6 The mixture may be prepared by mixing parts by weight.

More preferably, Al powder 23 parts by weight of Al ₂ F ₆ 3 parts by weight of silicon dioxide (SiO ₂₎ 23 parts by _weight, hematite (Fe ₂ O ₃₎ 23 parts by weight of sodium silicate (Water Glass) 17 parts by weight, Urea Resin (Urea Resin) 3 parts by weight Rice Husk Ash (RHA) 5 parts by weight, 5 parts by weight of cenosphere (Cenosphere) and 5 parts by weight of pearlite (pearlite) can be mixed to prepare a mixture.

In addition, in order to increase the surface strength of the sleeve of the present invention, it is preferable that soda silicate includes 16 to 22 parts by weight of Soda Silicate (Water Glass) 2 and 1 to 3 parts by weight of No. 3.

At this time, when the Al powder is less than 20 parts by weight, the heat generation function is insignificant, and when it exceeds 26 parts by weight, the heat generation effect is sufficiently exhibited, which may cause inefficiency.

In addition, when Al ₂ F ₆ is less than 2.5 parts by weight, the heat generation function is insignificant, and when it exceeds 3.5 parts by weight, a heat generation effect is sufficiently exhibited, which may cause inefficiency.

In addition, when silicon dioxide (SiO ₂ ) is less than 20 parts by weight, the heat generation function is insignificant, and when it exceeds 26 parts by weight, a heat generation effect is sufficiently exhibited, which may cause inefficiency.

In addition, when Fe ₂ O ₃ is less than 20 parts by weight, the heat generation function is insignificant, and when it exceeds 26 parts by weight, a problem of inefficiency may occur because the heating effect is sufficiently exhibited.

In addition, when the soda silicate (Water Glass) is less than 17 parts by weight, curing may not be achieved well and the effect of increasing hygroscopicity is negligible, and when it exceeds 25 parts by weight, curing is sufficiently made inefficient, resulting in problems of increasing weight. Can.

In addition, when the urea resin (Urea Resin) is less than 2.5 parts by weight, the effect of increasing the product strength is negligible, and when it exceeds 3.5 parts by weight, the product strength is sufficiently increased to cause inefficiency.

In addition, when Rice Husk Ash (RHA) is less than 4 parts by weight, the light weighting effect is negligible, and when it exceeds 6 parts by weight, the surface becomes weak and manufacturing cost may increase.

In addition, when the cenosphere (Cenosphere) is less than 4 parts by weight, the effect of improving light weight and heat generation is negligible, and when it exceeds 6 parts by weight, the surface becomes weak and manufacturing cost may increase.

In addition, when pearlite is less than 4 parts by weight, the effect of lightening and improving heat generation is negligible, and when it exceeds 6 parts by weight, the surface becomes weak and manufacturing cost may increase.

In addition, in the mixing step (S100), pitch-based carbon fibers may be further mixed into the mixture to prevent cracks in the interior of the sleeve.

More specifically, 2.5 to 3.5 parts by weight of pitch-based carbon fibers may be further mixed, and preferably 3 parts by weight of pitch-based carbon fibers may be further mixed.

Pitch-based carbon fibers have high impact resistance and can act as a binder to prevent cracks in the sleeve from occurring.

In addition, pitch-based carbon fibers have a lower cost compared to PAN-based carbon fibers having a similar effect, thereby reducing manufacturing costs.

At this time, if the pitch-based (pitch-based) carbon fiber is less than 2.5 parts by weight, the impact resistance increase effect is negligible, if it exceeds 3.5 parts by weight, there may be a problem that the manufacturing cost increases in preparation for the effect.

In addition, the mixing step (S100) may further mix the acrylic emulsion in the mixture to improve the impact resistance of the sleeve.

More specifically, 2.5 to 3.5 parts by weight of the acrylic emulsion is further mixed, and preferably 3 parts by weight of the acrylic emulsion can be further mixed.

The acrylic emulsion has impact resistance, and thus improves the impact resistance of the sleeve to prevent it from being broken.

At this time, when the acrylic emulsion is less than 2.5 parts by weight, the effect of improving impact resistance is negligible, and when it exceeds 3.5 parts by weight, there may be a problem that manufacturing cost increases in preparation for the effect.

Next, the forming step (S200) is a step of forming the mixture by shooting the mixture with air pressure.

In the related art, a sleeve is manufactured by vacuum forming using a vacuum pump of about 30 horsepower, and accordingly, a problem that productivity decreases frequently occurs.

However, the present invention has an effect of having a high productivity compared to a conventional manufacturing method by manufacturing a sleeve by shooting and molding a mixture with air pressure.

At this time, the air pressure may be 5kg to 6kg, more preferably 6kg. This is because when the air pressure is less than 5 kg, the strength of the product is weakly formed.

Next, the curing step (S300) is a step of curing by spraying CO ₂ gas to the molded mixture, and accordingly, the mixture molded by the mold may be cured.

Here, the CO ₂ gas injection time may be 3 to 7 seconds, and 5 seconds is preferred, but is not limited thereto, and the injection time may be increased depending on circumstances such as a case where the size of the manufactured sleeve is large.

Meanwhile, in such a case it is possible to increase the CO ₂ amount after increasing the injection time, can be from the upper side in step S300 to reduce the CO ₂ consumption and at the same time injecting the CO ₂ gas in the lower mold proceed as a vacuum Suction.

As described above, when the step S300 is performed, the amount of CO ₂ gas to be discarded is reduced, so that the amount of CO ₂ used is not only reduced, but also the curing efficiency can be improved to shorten the curing time.

Accordingly, curing is performed without a separate curing step, thereby reducing manufacturing time. At this time, a phenomenon in which the surface of the cured mixture is coated may be achieved.

More specifically, soda (Water Glass) reacts with CO ₂ gas sprayed on the surface to harden and coat the surface of the mixture, so that the sleeve has an effect of having low hygroscopicity.

Next, the demoulding step (S400) is a step of demolding the cured mixture from the mold.

Next, the spraying step (S450) is a step of spraying the urea mixture liquid on the surface of the demolded mixture, and it is possible to improve the surface strength of the sleeve, and such a S450 step is preferably included, but is not necessarily included Therefore, it can be selectively included and proceeded.

Here, the urea mixture may be prepared by mixing urea resin and water in a weight ratio of 1:1.

Conventionally, there is a limit in manufacturing a sleeve that satisfies both elements due to the inversely proportional characteristics of weight reduction and increase in surface strength for heat generation, but the present invention improves the surface strength through the S450 step as described above to generate heat through weight reduction. Even if the property is excellent, a sleeve with improved surface strength can be manufactured.

Next, the drying step (S500) is a step of drying the demolded mixture, and more specifically, the demolded mixture may be dried for 30 minutes to 2 hours at 100 to 120°C using hot air.

Preferably, the demolded mixture can be dried at 120° C. for 1 hour using hot air.

Conventionally, the sleeve is prepared by curing and drying for about 7 to 8 hours at a high temperature of about 150 to 170°C using hot air, but the present invention is to dry for 30 minutes to 2 hours at a low temperature of 100 to 120°C using hot air. Since it is possible, it has the effect of reducing the drying time and cost.

At this time, if the drying temperature is less than 100°C, curing may not be achieved because the urea resin is a liquid thermosetting resin, and if it exceeds 120°C, fuel is wasted and is inefficient.

In addition, when the drying time is less than 30 minutes, drying does not occur sufficiently, and when it exceeds 2 hours, a problem that the demolded mixture is sufficiently dried and inefficient may occur.

Through the above-described manufacturing method, a heating sleeve in the sleeve may be manufactured and provided.

The sleeve manufacturing method according to the second embodiment of the present invention includes a mixing step (S100), a molding step (S200), a curing step (S300), a demoulding step (S400), a spraying step (S450), and a drying step (S500). can do.

Here, the sleeve manufacturing method according to the second embodiment is a method of manufacturing a heat-insulating sleeve, and the heat-insulating sleeve is manufactured by using alumina and silica sand with high heat insulating properties together with a lightweight material, thereby more effectively insulating effect by generating an air layer and insulating function. Can appear. Thus, the raw materials used in the mixing step (S100) may include alumina, silica sand, soda silicate, and lightweight materials.

Here, the method of manufacturing the sleeve according to the second embodiment of the present invention is substantially the same as the method of manufacturing the sleeve according to the first embodiment of the present invention described above, except for the raw material that is mixed and prepared in the mixture in the mixing step (S100) Is formed.

Therefore, only the step S100 will be described in detail.

The mixing step (S100) of the sleeve manufacturing method according to the second embodiment of the present invention is a step of mixing the raw materials in the same manner as in the first embodiment to prepare a mixture, and the raw materials include alumina, silica sand, silicate soda and light weight raw materials can do.

Alumina and silica sand are materials with high thermal insulation, and can be used in thermal insulation sleeves so that the thermal insulation effect can be effectively exhibited by the air layer formed by the use of lightweight materials.

Soda silicate (Water Glass) can be hardened due to the reaction with CO ₂ gas to enhance the strength of the sleeve and lower the hygroscopicity.

The lightweight material is for reducing brittleness, reducing weight and improving heat retention, and may include one or more of Rice Husk Ash (RHA), Cenosphere, and pearlite.

Accordingly, in the mixing step (S100), a mixture of alumina, silica sand, silicate soda, and light weight raw material can be prepared. 5-15 parts by weight of alumina, 20-35 parts by weight of silica, 17-35 parts by weight of soda silicate, and lighter weight raw material The mixture can be prepared by mixing 20 to 35 parts by weight.

Preferably, a mixture can be prepared by mixing 5-15 parts by weight of alumina, 20-35 parts by weight of silica sand, 20-35 parts by weight of soda silicate, and 20-35 parts by weight of Rice Husk Ash (RHA), more preferably alumina The mixture can be prepared by mixing 10 parts by weight, 30 parts by weight of silica sand, 30 parts by weight of soda silicate, and 30 parts by weight of Rice Husk Ash (RHA).

In addition, in order to increase the surface strength of the sleeve of the present invention, it is preferable to include silicate soda 22 to 27 parts by weight of water silicate 2 and 3 to 8 parts by weight of 3, and water silicate. It is more preferable to include 25 parts by weight of No. 2 and 5 parts by weight of Soda Silicate (Water Glass).

At this time, if the alumina is less than 5 parts by weight, the thermal insulation function is insignificant, and when it exceeds 15 parts by weight, the effect of keeping warm appears sufficiently, which may cause inefficiency.

In addition, when the silica sand is less than 20 parts by weight, the thermal insulation function is insignificant, and when it exceeds 35 parts by weight, the thermal insulation effect is sufficiently exhibited, which may cause inefficiency.

In addition, if the soda silicate is less than 17 parts by weight, curing may not be achieved well and the effect of increasing hygroscopicity is negligible, and when it exceeds 35 parts by weight, curing may be sufficiently inefficient, resulting in problems of increasing weight.

In addition, when the light weight raw material is less than 20 parts by weight, the light weight effect is insignificant, and when it exceeds 35 parts by weight, the surface becomes weak and manufacturing cost may increase.

In addition, in the mixing step (S100), pitch-based carbon fibers may be further mixed into the mixture to prevent cracks in the interior of the sleeve.

More specifically, 2.5 to 3.5 parts by weight of pitch-based carbon fibers may be further mixed, and preferably 3 parts by weight of pitch-based carbon fibers may be further mixed.

Pitch-based carbon fibers have high impact resistance and can act as a binder to prevent cracks in the sleeve from occurring.

In addition, pitch-based carbon fibers have a lower cost compared to PAN-based carbon fibers having a similar effect, thereby reducing manufacturing costs.

At this time, if the pitch-based (pitch-based) carbon fiber is less than 2.5 parts by weight, the impact resistance increase effect is negligible, if it exceeds 3.5 parts by weight, there may be a problem that the manufacturing cost increases in preparation for the effect.

In addition, the mixing step (S100) may further mix the acrylic emulsion in the mixture to improve the impact resistance of the sleeve.

More specifically, 2.5 to 3.5 parts by weight of the acrylic emulsion is further mixed, and preferably 3 parts by weight of the acrylic emulsion can be further mixed.

The acrylic emulsion has impact resistance, and thus improves the impact resistance of the sleeve to prevent it from being broken.

At this time, when the acrylic emulsion is less than 2.5 parts by weight, the effect of improving impact resistance is negligible, and when it exceeds 3.5 parts by weight, there may be a problem that manufacturing cost increases in preparation for the effect.

As described above, the heating sleeve and its manufacturing method according to an embodiment of the present invention have the effect of having a high productivity since the mixture is shot by air pressure, molded, and cured through CO ₂ gas injection to produce the sleeve.

In addition, it has the effect of having a high heating function.

In addition, soda silicate (Water Glass) coats the surface of the cured mixture, so it has an effect of having low hygroscopicity.

In addition, drying at a low temperature for a short time has an effect of reducing the drying time and cost.

In addition, since it has high impact resistance, it has an effect of preventing cracks from occurring inside the sleeve.

In addition, compared to the existing wet process, the wastewater is not generated and the working environment can be improved.

Hereinafter, the present invention described above will be described in more detail with reference to experimental examples and examples. However, the present invention is not necessarily limited to these experimental examples and examples.

[ Experimental Example One] Soda silicate Content selection

In order to select the content of sodium silicate in the heating sleeve, the amount of soda silicate (13, 14, 15, 17, 19, 20 parts by weight) was varied to evaluate curability and lightness.

As a control group, RHA was excluded from the mixture, and RHA was used in the same experiment, except that carbonized rice husk was used instead of high-carbon rice husk, to evaluate curability and lightness.

Table 1 shows the results.

As can be seen from Table 1, when using high carbon rice husks, it was confirmed that the curability and light weight were good from 17 parts by weight of sodium silicate. Accordingly, it was determined that the content of sodium silicate is preferably 17 parts by weight or more, and is economical. Finally considering the phosphorus side, the sodium silicate content was finally selected as 17 parts by weight.

In addition, it was confirmed that it is desirable to add a high carbon chaff, considering both the curability, light weight, and sodium silicate content.

[ Experimental Example 2] Al powder particle size selection

In order to select the type of particle size of the Al powder used for the heat-generating sleeve, heat-generating sleeves were prepared by varying the Al powder types (No. 1, No. 2, No. 3), and the weight, surface strength, and product strength were measured.

Table 2 is a particle size distribution according to the type of Al powder particle size, the results are shown in Table 3.

As can be seen in Table 3, it was confirmed that the Al powder No. 2 was good in all aspects. In the case of using Al powder No. 1, the weight reduction effect was slightly higher than that of No. 2, but it was judged that the surface strength and product strength were poor, and thus it was judged to be unsuitable.

[ Experimental Example 3] Product formability and strength evaluation according to air pressure

In order to select the air pressure in the forming step, the mixture was shot in a mold with respective air pressures (3 kg, 4 kg, 5 kg, 6 kg), molded into a cylindrical shape, and then cured by spraying CO ₂ gas. After demolding the cured mixture from the mold, a sleeve was prepared by drying at 120° C. for 1 hour using hot air, and moldability and strength were evaluated.

At this time, the moldability was evaluated by observing whether the shape was well formed.

As a control, our product wet sleeve was used.

Table 4 shows the results.

As can be seen from Table 4, when molded with 3kg and 4kg air pressure, the shape was not well formed into a cylindrical shape and strength measurement was impossible, and when molded with 5kg and 6kg air pressure, the shape was also good It was confirmed that higher strength than the wet sleeve was measured with 2157N and 2169N, respectively. Accordingly, it was determined that it is desirable to harden at an air pressure of 5 kg or more in the forming step.

[ Experimental Example 4] CO ₂ Evaluation of curability according to gas input time

In order to select the CO ₂ gas input time in the curing step, the mixture was shot into a mold with 6 kg of air pressure, molded into a cylindrical shape, and then CO ₂ gas was hourly (3, 4, 5, 6, 7 seconds). And sprayed to cure. The molded mixture was demolded from the mold, and then dried at 120° C. for 1 hour using a hot air to prepare a sleeve, and curability was evaluated.

Table 5 shows the results.

As can be seen in Table 5, it was confirmed that the curing properties were poor at 3 seconds and 4 seconds, and good from 5 seconds. Accordingly, in the curing step, the CO ₂ gas injection time was selected to be 5 seconds or more, and considering the economical efficiency and workability, the most desirable time is considered to be 5 seconds.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it will be understood that the present invention may be implemented in other specific forms by those skilled in the art. Therefore, the above-described embodiment is illustrative in all respects and is not limiting.

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Claims (15)

A mixing step of mixing the raw materials to prepare a mixture;
A molding step of forming the mixture by shooting the mold with air pressure;
A curing step of curing by spraying CO ₂ gas onto the molded mixture;
Demolding step of demolding the cured mixture from the mold and
A drying step for drying the demolded mixture,
The raw material,
It includes heating materials, feedstocks, hardened raw materials, and lightweight materials,
The heating material,
Contains at least one of Al powder and Al ₂ F ₆ ,
The feedstock,
Silicon dioxide (SiO ₂ ) And hematite (Fe ₂ O ₃ ) It contains at least one of,
The curing raw material,
Contains soda silicate (Water Glass) and urea resin (Urea Resin),
The lightweight material,
Sleeve manufacturing method characterized in that it comprises at least one of rice husk ash (RHA), cenosphere (Cenosphere) and pearlite (pearlite).
delete delete According to claim 1,
The mixing step,
Al powder 20-26 parts by weight, Al ₂ F ₆ 2.5-3.5 parts by weight, silicon dioxide (SiO ₂ ) 20-26 parts by weight _, hematite (Fe ₂ O ₃ ) 20-26 parts by weight, soda silicate 17 ~25 parts by weight, urea resin (Urea Resin) 2.5~3.5 parts by weight Rice Husk Ash (RHA) 4-6 parts by weight, Senosphere (Cenosphere) 4-6 parts by weight, and pearlite 4-6 parts by weight Method for manufacturing a sleeve, characterized in that to prepare a mixture.
delete delete delete According to claim 1,
The drying step,
Sleeve manufacturing method characterized in that the molded mixture is dried for 30 minutes to 2 hours at 100 ~ 120 ℃.
According to claim 1,
The raw material,
Sleeve manufacturing method characterized in that it further comprises a pitch-based (pitch-based) carbon fiber.
The method of claim 9,
The mixing step,
Pitch-based sleeve manufacturing method characterized in that to prepare a mixture by further mixing 2.5 to 3.5 parts by weight of carbon fiber.
According to claim 1,
The raw material,
Sleeve manufacturing method characterized in that it further comprises an acrylic emulsion.
According to claim 1,
After the demoulding step,
A sleeve manufacturing method further comprising a spraying step of spraying a mixture of urea on the surface of the demolded mixture.
The method of claim 12,
The urea mixture,
Urea Resin (Urea Resin) and a sleeve manufacturing method characterized in that it is prepared by mixing water in a weight ratio of 1:1.
Heated raw materials, feedstocks, curing raw materials and lightweight materials include,
The heating material,
Contains at least one of Al powder and Al ₂ F ₆ ,
The feedstock,
Silicon dioxide (SiO ₂ ) And hematite (Fe ₂ O ₃ ) It contains at least one of,
The curing raw material,
Contains soda silicate (Water Glass) and urea resin (Urea Resin),
The lightweight material,
Sleeves comprising one or more of Rice Husk Ash (RHA), Cenosphere and Pearlite.
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