KR102597969B1 - Insulating tank with built-in direct heating type heater - Google Patents

Abstract

A thermal insulation tank with a built-in direct heating type heater according to the present invention includes a tank body storing a fluid to be heated; A through hole formed in at least one side of the tank body; A heater is inserted into the through hole and extends to the internal space of the tank body to heat the fluid to be heated.
According to the thermal insulation tank with a built-in direct heating heater according to the present invention, the fluid to be heated can be heated by inserting the heater into the through hole of the existing tank, thereby reducing production costs and excellent thermal efficiency through the direct heating method. Provides an effect that can guarantee.

Description

Insulating tank with built-in direct heating type heater}

The present invention relates to a thermal insulation tank with a built-in direct heating type heater. More specifically, in order to connect pipes, etc., a heater extended to a certain length is inserted into a through hole penetrated on one side of the tank body and then sealed. This relates to a thermal insulation tank that can be manufactured relatively inexpensively while ensuring excellent thermal efficiency by directly heating the fluid to be heated built into the tank body.

A so-called chemical tank or chemical tank refers to a tank that stores various liquid chemicals such as acids, alkalis, and solvents. Depending on the type of chemical substance, stability needs to be strengthened or storage conditions must be maintained under specific conditions. Conditions may be requested.

In particular, when chemicals need to be preserved at a temperature higher than room temperature, as well as when stored at a temperature higher than the external temperature in winter, there is a need to heat or keep the chemicals warm, and this is also called a thermal insulation tank.

A conventional thermal insulation tank is made by wrapping a reinforcing metal material on the top, then laminating metal layers such as steel plates and tin, and inserting a heating wire into the tank to ensure the thermal insulation of chemicals stored in the tank.

However, this structure has the problem of low thermal efficiency and unnecessary increase in maintenance costs because it is a method of heating the tank wall, that is, a method of heating chemicals indirectly rather than directly.

The thermal insulation cover of a fuel tank containing a heating wire, which is Korean Patent Publication No. 10-2006-0088514, is a means and method for insulating a normal fuel tank, and consists of glass fiber surrounded by a heating wire and wrapping it with an insulator to cover the inner surface of the thermal insulation cover of the fuel tank. It is disclosed that it is possible to block the cooling of the fuel inside the tank by constructing a thermometer that is contained (excreted) between the and the exterior surface, and is also excreted in order to sense the temperature of the fuel tank and transmit it as an electrical signal to the display unit.

However, according to the above technology, since the fuel is heated through a heating wire installed on the cover rather than the tank itself, the disadvantages of the above-mentioned problem, namely, lower thermal efficiency and the additional cost of installing the heating wire on the cover, can be pointed out.

Therefore, there is a need to develop a new and advanced thermal insulation tank that can maintain an appropriate temperature by directly heating the fluid stored in the tank through a more intuitive heater installation structure.

Korean Public Patent No. 10-2006-0088514

The present invention was developed to overcome the problems of the above technology. By using a through hole formed for piping connection as a heater installation means, unnecessary heater installation costs are reduced, and the heater directly heats the fluid stored in the tank. The main purpose is to provide a thermal insulation tank that can boast excellent thermal efficiency.

Another object of the present invention is to provide a heater with smart operation control functions such as automatic power control, operation control for a specific time by a timer, and temperature maintenance control according to temperature settings.

Another object of the present invention is to ensure the stability of the tank body by uniquely designing the structure of the heater so that it does not provide heat directly to the tank body.

An additional object of the present invention is to coat the inner peripheral surface of the through hole of the tank body into which the heater is inserted with a heat-resistant reinforcement agent that can prevent thermal deformation from occurring due to the heat of the heater or the heat of the heated fluid.

In order to achieve the above object, a thermal insulation tank with a built-in direct heating type heater according to the present invention includes a tank body storing a fluid to be heated; A through hole formed in at least one side of the tank body; A heater is inserted into the through hole and extends to the internal space of the tank body to heat the fluid to be heated.

In addition, the heater includes a controller located within the through hole to control the operation of the heating unit, a heating unit extending into the internal space and generating heat, and located between the controller and the heating unit, between the through hole and the internal space. It is characterized by including a reinforcing part that seals the boundary portion of the space, and a cap coupled to the outer end of the controller.

In addition, the inner peripheral surface of the through hole is characterized in that a heat-resistant reinforcement agent containing polybenzoxazine is coated.

According to the thermal insulation tank with a built-in direct heating heater according to the present invention,

1) It has the advantage of being able to heat the fluid to be heated by inserting a heater into the through hole of an existing tank, thereby reducing production costs and ensuring excellent thermal efficiency through direct heating.

2) By dividing the heating part of the heater extending inside the tank body into a part where the heating element is installed and a part where the heating element is not installed, the problem of direct heat transfer to the tank main body can be prevented.

3) Through various operation controls of the heater, it not only provides convenience in the thermal insulation environment of the fluid to be heated, but also provides

4) The inner surface of the through hole where the heater is inserted is coated with a separate reinforcing agent that can ensure excellent heat resistance, which has the effect of strengthening the stability of the heating and storage environment.

1 is a front view showing the overall appearance of the thermal insulation tank of the present invention.
Figure 2 is a plan view of Figure 1.
Figure 3 is a perspective view of Figure 1.
Figure 4 is a perspective view showing a flange fused to a through hole of a case.
Figure 5 is a cross-sectional view of the heater of the present invention.
Figure 6 is a conceptual diagram showing an embodiment of a heater equipped with a temperature controller.
Figure 7 is a flowchart showing the manufacturing steps of the heat-resistant strengthener of the present invention.
Figure 8 is a flowchart showing the manufacturing steps of the acidity regulator of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The accompanying drawings are not drawn to scale, and like reference numbers in each drawing refer to like elements.

Figure 1 is a front view showing the overall appearance of the thermal insulation tank of the present invention, and Figure 2 is a plan view of Figure 1.

As can be seen from Figures 1 and 2, the thermal insulation tank of the present invention includes a tank body storing a fluid to be heated.

The tank body 100 provides a basic space for storing fluid in an internal space in a cylindrical shape or in various other shapes, and can be manufactured to a height of several meters.

Referring to Figure 2, it can be seen that a cover 101 that can open and close the internal space is mounted on the upper surface of the tank body 100, and when the height of the tank body 100 reaches several meters, convenience of maintenance or repairs is provided. For this purpose, a ladder extending along the height direction of the tank main body 100 may be installed on one side of the tank main body 100.

This tank body 100 can store a fluid to be heated. In this case, the term 'fluid to be heated' refers to various liquid chemicals such as acids, alkalis, and solvents, and especially those that require heat retention to maintain an appropriate temperature. Due to the characteristic of requiring thermal insulation, the heating object heated by the heater 200, which will be described later, is defined as a fluid to be heated in the present invention.

When the fluid to be heated can have a temperature higher than room temperature, it is desirable to manufacture the tank body 100 from a material with heat resistance. Since the fluid to be heated is often made of drugs or chemicals, the tank of the present invention is used. It may also be named a chemical tank or chemical tank.

Materials with such heat resistance include metal materials such as stainless steel and carbon steel, as well as engineering plastic materials such as polypropylene (PP) and polyethylene (PE). In addition, depending on the type of fluid to be heated and the insulation temperature range, poly It may be made of a heat-resistant or flame-retardant material such as carbonate (PC) or ABS (Acrylonitrile Butadiene Styrene), or it may be made of dual materials, that is, the inner material is engineering plastic and the outer material is metal.

Figure 3 is a perspective view of Figure 1, and Figure 4 is a perspective view showing a flange fused to the through hole of the case.

A through hole 110 is formed through at least one side of the tank body 100 described above.

The through hole 110 is a hole into which a pipe can be generally connected to discharge the fluid to be heated stored in the tank body 100 to the outside. In the present invention, a plurality of such holes are formed in the tank body 100. In the manufactured state, at least one of these is used as a space where a heater 200, which will be described later, can be installed.

If two or more through holes 110 to which the heater 200 is coupled are formed, preferably each through hole 110 is penetrated with a height difference, and the heater 200 is coupled to each of them to heat the target. It can provide a basis for balanced heating of the upper and lower parts of the fluid.

It is possible that a ring-shaped flange 120 is fused to one outer side of the through hole 110.

The flange 120 serves as a coupling means for coupling with the pipe when the through hole 110 is formed for the purpose of coupling pipes. Of course, the through hole 110 of the present invention is used for coupling pipes. However, most through-holes 110 are often coupled with a flange 120 to be used for piping coupling purposes. In other words, the heater 200, which will be described later, is only coupled to a specific through-hole 110. This proves that not only can it be done, but it can also be easily coupled to the through hole 110 penetrated for pipe joining purposes.

This flange 120 can be coupled to a neck 111 that protrudes outward along the circumference of the through hole 110, and is coupled to the neck 111 by heat fusion to provide a closer coupling relationship. It is desirable to be For this purpose, the flange 120 can be made of polyethylene (PE), which is widely used as a heat-sealing material.

In addition, the flange 120 reduces the outer diameter of the through hole 110 and serves as a medium through which sealing materials can be combined (especially by fusion bonding) during finishing or sealing work for waterproofing after insertion of the heater 200. Can fulfill both roles.

The heater 200 of the present invention is inserted into the through hole 110 (via the flange in a structure in which a flange is mounted on the through hole) and heats the fluid to be heated in a state that extends to the internal space of the tank body 100. Provides functionality.

That is, the heater 200 of the present invention has a structure that extends in a straight line, so that it can have a shape as if it were plugged into one side of the tank body 100 and extended into its internal space.

This heater 200 can heat the fluid to be heated by receiving external power and applying this external power to a heating element mounted on the heater 200 so that the heating element generates heat.

This heater 200 can be made of various materials, but it is preferably made of stainless steel (SUS) for durability without rusting.

In addition, although not shown in the drawing, the gap or externally exposed portion of the through hole 110 where the heater 200 is inserted can be sealed to prevent the problem of the fluid to be heated leaking to the outside along the through hole 110. Of course it exists.

In summary, according to the thermal insulation tank with a built-in heater 200, when manufacturing an existing thermal insulation tank, a reinforcing metal material is wrapped around the upper part of the tank, then steel plates and tin are laminated, and a heat wire is inserted into the conventional indirect heating method. Unlike others, it intuitively heats the fluid to be heated directly, so it not only boasts excellent heat retention and thermal efficiency, but also has the characteristic of providing convenience of maintenance while being relatively inexpensive to manufacture.

Figure 5 is a cross-sectional view of the heater of the present invention.

As can be seen from FIG. 5 , the heater 200 may include a controller 210, a heating unit 220, a reinforcement unit 230, and a cap 240.

The basic function of controlling the operation of the heating unit 220 by receiving external power and applying power to the heating unit 220 while the controller 210 is in the form of a circular block (it can also be in the shape of a square block) is Of course, as will be explained later, it refers to a driving means that can additionally have heating time and heating temperature control functions.

The heating unit 220 extends a certain length into the internal space of the tank body 100 to provide a function of generating heat. As can be seen from FIG. 5, it can be formed of a plurality of heating tubes including a heating element. At this time, the heating tube is made of stainless steel to ensure durability and stability.

At this time, various known heating elements can be used as the heating element, and since this heating element is the same as the known heating element, a separate description will be omitted.

The reinforcement part 230 is a structure located between the controller 210 and the heating part 220 to seal the boundary between the through hole 110 and the internal space of the tank body 100. It has a diameter corresponding to the diameter and is tightly coupled to the through hole 110.

At this time, threads are formed on the inner peripheral surface of the through hole 110 and the outer peripheral surface of the reinforcement portion 230, and the two are threaded together to prevent the problem of being pushed outward from the through hole 110 due to the pressure of the fluid to be heated. .

This reinforcement portion 230 not only provides a sealing role to prevent the fluid to be heated from leaking outward through the gap between the controller 210 and the through hole 110, but is also made of stainless steel to prevent heat from the heating portion 220. Due to the easily occurring deformation, the through hole 110 cannot be properly sealed, thereby preventing the problem of fluid to be heated leaking out of the tank body 100.

The cap 240 is made of a cylindrical structure surrounding the controller 210 or a ring structure with a central portion penetrated, and the outer portion of the through hole 110 is sealed to provide waterproofing and protect the controller 210. can perform its role.

Figure 6 is a conceptual diagram showing an embodiment of a heater equipped with a temperature controller.

In addition, as can be seen from FIG. 6, the heater 200 includes a temperature controller 250, and correspondingly, the controller 210 of the heater 200 adjusts the temperature to the set temperature at which the user operates the temperature controller 250. It may include a function to control the heating temperature of the heating unit 220.

Additionally, the controller 210 of the heater 200 may include a function for controlling the operation on/off and setting the temperature at a set time in conjunction with a timer.

Furthermore, the heater 200 may be equipped with a temperature sensor that detects the temperature on the heating part 220, and in response, the controller 210 may be installed in the heating part (220) according to the temperature measured by the temperature sensor. 220) can provide a function to adjust the heating output.

In particular, when the heating element is mounted on the entire heating part 220 extending in the inner direction of the tank main body 100, the tank main body 100 made of plastic material is heated due to heating of the heating element near the inner wall of the tank main body 100. Since there may be a fatal problem that unnecessary melting or thermal deformation may occur, as can be seen from FIG. 2, it is preferable that the heating unit 220 is composed of a buffer tube 221 and a heating tube 222.

Specifically, the buffer pipe 221 is a pipe extending from the reinforcement portion 230 to the internal space of the tank main body 100 without the above-described heating element, and the heating pipe 222 is located at the end of the buffer pipe 221 to the tank main body 100. ) It is a pipe that extends further into the internal space of the pipe and actually provides a heating function by generating heat from the heating element while containing it.

That is, the heating element is not mounted on the buffer pipe 221, which is a pipe close to the wall of the tank main body 100, thereby protecting the tank main body 100, and the heating tube 222 penetrates relatively deeply into the internal space of the tank main body 100. It provides a function of ensuring stability while sufficiently ensuring the thermal efficiency of heating the fluid to be heated by generating heat only in ).

At this time, both the buffer tube 221 and the heating tube 222 may be made of the above-described stainless steel, and the lengths of both are set to be the same or similar to balance the protection of the tank body 100 and the heating function of the fluid to be heated. Let’s do it.

Furthermore, it is possible for the inner peripheral surface of the through hole 110 of the tank body 100 to be coated with a heat-resistant reinforcing agent containing polybenzoxazine.

In particular, the material of the tank body 100 around the through hole 110 is polyethylene (PE) with a softening temperature of 80 to 130 °C or polystyrene (PS) with a softening temperature of 70 to 115 °C. When manufactured from polymer plastics such as , it is more advantageous to apply the heat-resistant reinforcement agent described above.

Polybenzoxazine is a type of thermosetting resin and is known to have excellent heat resistance and flame suppression properties. Specifically, unlike thermoplastic polymers such as polyethylene and polypropylene, polybenzoxazine, a thermosetting resin, does not soften or melt even in the heat of the heating area or the heated fluid and undergoes a chemical cross-linking reaction that permanently establishes a solid structure, thereby demonstrating high thermal stability. It exhibits the property of being able to withstand temperatures of up to 300 to 400°C without the above-mentioned deterioration or softening.

That is, the inner peripheral surface of the through hole 110 is coated with a heat-resistant reinforcement agent containing polybenzoxazine to an appropriate thickness, so that not only the through hole 110 but also the tank body made of a thermoplastic material is damaged by the heat of the heating part or the fluid to be heated. It can provide the function of preventing denaturation, that is, strengthening heat resistance.

At this time, the heat-resistant strengthener of the present invention may further include additional compositions in addition to the polybenzoxazine described above. The steps for manufacturing this heat-resistant strengthener will be described in more detail as follows.

Figure 7 is a flowchart showing the manufacturing steps of the heat-resistant strengthener of the present invention.

Referring to FIG. 7, the heat-resistant strengthener of the present invention can be manufactured through the step of preparing polybenzoxazine (S21) and the step of completing the heat-resistant strengthener (S22).

(S21) Step of producing polybenzoxazine

First, 40 to 50 parts by weight of acetaldehyde, 30 to 40 parts by weight of aniline, and 20 to 30 parts by weight of Bisphenol A (BPA) are mixed at 100 to 130° C. for 30 to 60 minutes to form polybenzo. Produces oxazine.

Here, preferably, the polybenzoxazine of the present invention is an aniline-based material, and can be formed by reacting the amine group (-NH2) attached to aniline with the hydroxy group (-OH) attached to bisphenol A.

In other words, aniline provides a ring structure containing nitrogen and oxygen on both benzene rings, and bisphenol A provides a structure with two benzene rings attached to carbon 2 of propane.

Acetaldehyde is added as a solvent in the step of preparing polybenzoxazine, and also serves as a catalyst that can control the reaction rate between the above-mentioned amine group and hydroxy group.

(S22) Step of completing the heat-resistant strengthener

Next, 40 to 50 parts by weight of polybenzoxazine, 30 to 50 parts by weight of propylene glycol methyl ether acetate (PGMEA), silica, aluminum hydroxide, and lithium acetate. ) is mixed with 20 to 30 parts by weight of an acidity regulator containing and then dried under low pressure at 70 to 90°C and 0.01 to 0.05 bar for 3 to 5 hours.

Propylene Glycol Methyl Ether Acetate (PGMEA) is a substance with the molecular formula of C6H12O3, which has the property of dissolving and evenly dispersing the above-mentioned polybenzoxazine with better solubility and lower toxicity than ethyl ether. It is a solvent. Thereafter, the low-pressure dried heat-resistant strengthener can be obtained in powder form from which residual solvents and components have been removed.

The acidity regulator is added to lower the acidity of the heat-resistance enhancer to prevent a decrease in performance of the tank body 100, especially the area around the through hole 110, due to changes in acidity. The active ingredients include silica, aluminum hydroxide, It may contain lithium acetate, and a more detailed description will be provided later.

The heat resistance enhancer manufactured through this process serves to strengthen the heat resistance of the tank body 100 of the present invention, especially the area around the through hole 110, and stably inserts the heater 200 into the through hole 110 for a long period of time. ) provides an environment in which to use.

Furthermore, the acidity regulator of the present invention serves to lower the acidity of the heat resistance enhancer and prevent the non-heating fluid from being particularly acidic and a portion of the fluid flowing into the through hole 110 from causing a change in acidity in the area around the through hole 110. can be provided.

In addition, by assisting with the above-described heat-resistance strengthener, not only can constructability be further improved, but the problem of deterioration of rigidity and impact resistance due to deterioration occurring in the area around the through hole 110 due to the acidity of the fluid to be heated can be effectively prevented.

Furthermore, preferably, the acidity regulator of the present invention may further include additional compositions in addition to the silica, aluminum hydroxide, and lithium acetate described above. The steps for producing this acidity regulator are described in more detail as follows.

Figure 8 is a flowchart showing the manufacturing steps of the acidity regulator of the present invention.

8, the acidity regulator described above can be manufactured through the step of preparing mullite (S31), the step of preparing the intermediate material (S32), and the step of completing the acidity regulator (S33). there is.

(S31) Steps for producing mullite

First, 40 to 50 parts by weight of silica, 40 to 50 parts by weight of aluminum hydroxide, and 5 to 15 parts by weight of aluminum fluoride are heated at 900 to 1200°C for 1 to 3 hours and then pulverized. Manufactures mullite.

Silica and aluminum hydroxide are substances that form mullite by forming covalent bonds, and aluminum fluoride can play a role in controlling the speed of forming covalent bonds.

It is possible for alkali metals with low density to be adsorbed on mullite prepared in this way.

(S32) Preparing intermediate materials

Next, 30 to 40 parts by weight of mullite, 30 to 40 parts by weight of lithium acetate, and 30 to 40 parts by weight of purified water are mixed at 50 to 70° C. for 3 to 5 hours to prepare an intermediate material.

Lithium acetate plays the role of providing lithium to the acidity regulator and can simultaneously prevent the acidity regulator of the present invention from being excessively alkaline. As lithium ions are ionized from lithium acetate, they may be adsorbed on mullite. In this case, lithium ions may be adsorbed in the form of lithium hydroxide containing a hydroxyl group, thereby providing the function of alkalizing the acidified site.

(S33) Steps to complete the acidity regulator

Finally, 80 to 90 parts by weight of the intermediate material and 10 to 20 parts by weight of ethanol are pressed at 700 to 1000°C and 500 to 800 bar to complete the acidity regulator.

Ethanol is a highly volatile substance, and can serve to remove impurities or unreacted substances contained in the acidity regulator of the present invention. In addition, by going through the pressurization step, it is possible to doubly prevent unnecessary substances other than the active ingredients of the acidity regulator from remaining.

According to the acidity regulator of the present invention, durability is improved to prevent the problem of deterioration of the area around the through hole 110 due to partial inflow of the fluid to be heated, and according to experimental results to be described later, water permeability resistance is improved. By confirming that it can be retained, it was confirmed that unnecessary moisture remaining inside the through hole 110 can reduce the probability of electrical problems, such as short circuits, occurring when the heater 200 is driven.

Furthermore, it has the characteristic of being able to stably store unheated fluids vulnerable to changes in acidity in the tank body and expanding the range of heated fluids that can be stored in the tank body 100.

Hereinafter, in order to explain the physical properties of the heat-resistant strengthener of the present invention, the evaluation results of Examples and Comparative Examples will be compared and explained.

Examples consist of 1 to 3, and Comparative Example 1 is polyester that does not contain the heat-resistant strengthening agent of the present invention.

<Example 1>

1. Preparation of acidity regulator

45 g of silica, 45 g of aluminum hydroxide, and 10 g of aluminum fluoride were heated at 1000°C for 2 hours and then pulverized to prepare 100 g of mullite.

35 g of mullite, 35 g of lithium acetate, and 30 g of purified water were mixed at 60°C for 4 hours to prepare 100 g of an intermediate material.

100g of acidity regulator was prepared by pressurizing 85g of intermediate material and 15g of ethanol at 800°C and 700bar.

2. Preparation of heat-resistant strengthener

100 g of polybenzoxazine was prepared by mixing 45 g of acetaldehyde, 35 g of aniline, and 20 g of bisphenol A at 120°C for 50 minutes.

40 g of polybenzoxazine, 40 g of propylene glycol methyl ether acetate, and 20 g of the acidity regulator prepared through the process of step 1 above were mixed and dried under low pressure at 80°C and 0.03 bar for 4 hours to prepare 100 g of a heat resistance strengthener.

<Example 2>

1. Preparation of acidity regulator

100g of acidity regulator was prepared by mixing 25g of silica, 25g of aluminum hydroxide, and 50g of lithium acetate.

2. Preparation of heat-resistant strengthener

100 g of polybenzoxazine was prepared by mixing 45 g of acetaldehyde, 35 g of aniline, and 20 g of bisphenol A at 120°C for 50 minutes.

40 g of polybenzoxazine, 40 g of propylene glycol methyl ether acetate, and 20 g of the acidity regulator prepared through the process of step 1 above were mixed and dried under low pressure at 80°C and 0.03 bar for 4 hours to prepare 100 g of a heat resistance strengthener.

<Example 3>

1. Preparation of heat-resistant strengthener

100 g of polybenzoxazine was prepared by mixing 45 g of acetaldehyde, 35 g of aniline, and 20 g of bisphenol A at 120°C for 50 minutes.

<Comparative Example 1>

100g of polyester was prepared.

At this time, the composition of the heat resistance enhancer added in Examples 1 to 3 described above is shown in Table 1 below. Here, the unit of each value is weight%.

Here, heat-resistant enhancer 1 was added to Example 1, heat-resistant enhancer 2 was added to Example 2, and heat-resistant enhancer 3 was added to Example 3.

Heat Resistant Strengthener 1 Heat Resistant Strengthener 2 Heat Resistant Strengthener 3 silica 2.67 5 - aluminum hydroxide 2.67 5 - aluminum fluoride 0.59 - - lithium acetate 5.95 10 - Purified water 5.1 - - ethanol 3 - - acetaldehyde 18 18 45 aniline 14 14 35 Bisphenol A 8 8 20 Propylene glycol methyl ether acetate 40 40 -

In addition, the material mixing ratios of Examples 1 to 3 and Comparative Example 1 described above are shown in Table 2 below. Here, the unit of each value is weight%.

Example 1 Example 2 Example 3 Comparative Example 1 Ethylene vinyl acetate 60 60 60 60 Acrylic emulsion resin 20 20 20 20 Vinyl acetate resin 15 15 15 15 Vinyl acetate 3 3 3 5 Heat Resistant Strengthener 1 2 - - - Heat Resistant Strengthener 2 - 2 - - Heat Resistant Strengthener 3 - - 2 -

The prepared compositions of Examples 1 to 3 and Comparative Example 1 were applied to the surface of a structure measuring 1 m in width, 1 m in length, and 1 cm in thickness, dried, and then tested on the prepared samples.

[Experimental Example 3] Basic physical property test

1. Mechanical properties: To measure mechanical properties, tensile strength and elongation at breakage were measured according to ASTM D638 (50 mm/min).

2. Heat shielding performance (℃): After applying the sample on a 10 mm The temperature was measured. At this time, the lamp irradiation time was measured as an average of 4 hours because the steady-state state is generally reached in about 4 hours.

3. Water vapor transmission rate: Water vapor transmission rate was measured according to KS F 4936.

4. Permeability resistance: In accordance with KS F 4936, apply water pressure of 0.1 MPa for 1 hour, wipe lightly with filter paper for about 10 seconds, and check whether water is permeated into the bottom plate under the coating material and wet. Sex was measured.

Table 3 is a table showing the tensile strength, elongation, heat insulation performance, moisture permeability, and water permeability test results. tensile strength
(psi) elongation rate
(%) Heat insulation performance
(℃) moisture permeability Permeability resistance Example 1 1860 400 51 3.1 not pitched Example 2 1857 398 55 4.8 not pitched Example 3 1850 378 60 5.1 not pitched Comparative Example 1 1803 310 67 37 pitched

As shown in Table 3 above, it can be confirmed that Examples 1 to 3 of the present invention are significantly superior to Comparative Example 1 in tensile strength, elongation, heat insulation performance, moisture permeability, and water permeability resistance.

Furthermore, through comparative processing of Examples 1 to 3, it can be shown that Example 1, which consists of a mixed composition of various materials, has better performance than Examples 2 to 3.

[Experimental Example 4] Heat resistance test

1. Heat resistance: Each composition was left in an electric furnace at 300°C for 1 hour, and the heat resistance was measured by checking changes in surface color, strength, and adhesion.

Table 4 shows the heat resistance test results. Example 1 Example 2 Example 3 Comparative Example 1 No change in physical properties No change in physical properties No change in physical properties There is a change in physical properties

When described with reference to Table 4, it can be confirmed that Examples 1 to 3 of the present invention have superior heat resistance compared to Comparative Example 1.

As explained so far, the configuration and operation of the thermal insulation tank with a built-in direct heating type heater according to the present invention has been expressed in the above description and drawings, but this is only an example and the idea of the present invention is not reflected in the above description and drawings. It is not limited, and of course, various changes and modifications are possible without departing from the technical spirit of the present invention.

100: tank body 101: cover
110: Through hole 111: Neck
120: Flange 200: Heater
210: Controller 220: Heating unit
221: buffer tube 222: heating tube
230: reinforcement part 240: cap
250: Temperature controller

Claims (8)

A thermal insulation tank with a built-in direct heating heater,
A tank body storing the fluid to be heated;
A through hole formed in at least one side of the tank body;
a heater inserted into the through hole and extending to the internal space of the tank body to heat the fluid to be heated;
Including a heat-resistant strengthener coated on the inner peripheral surface of the through hole,
The heat resistance strengthener is,
40 to 50 parts by weight of acetaldehyde, 30 to 40 parts by weight of aniline, and 20 to 30 parts by weight of bisphenol A (BPA) are mixed at 100 to 130°C for 30 to 60 minutes to produce polybenzoxazine. manufacturing a;
40 to 50 parts by weight of the polybenzoxazine, 30 to 50 parts by weight of propylene glycol methyl ether acetate (PGMEA), silica, aluminum hydroxide, and lithium acetate. Characterized in that it is manufactured through the step of mixing 20 to 30 parts by weight of an acidity regulator containing and drying at low pressure for 3 to 5 hours at 70 to 90 ° C. and 0.01 to 0.05 bar to complete the heat resistance strengthener. According to clause 1,
The heater is,
A controller located in the through hole to control the operation of the heating unit,
A heating part extending into the internal space and generating heat from the heating element,
A reinforcing part located between the controller and the heating part to seal the boundary between the through hole and the internal space,
A thermal insulation tank, characterized in that it includes a cap coupled to the outer end of the controller. According to clause 2,
The controller is,
A thermal insulation tank characterized by including a function to control the operation on/off and set the temperature at a set time in conjunction with a timer. According to clause 2,
The heater is,
Includes a temperature sensor that detects temperature,
The controller is,
A thermal insulation tank, characterized in that it includes a function to adjust the heating output according to the temperature measured by the temperature sensor. According to clause 2,
The heating unit,
A buffer pipe extending from the reinforcement portion to the internal space without the heating element,
A thermal insulation tank extending further from the end of the buffer pipe into the internal space and including a heating tube that generates heat from the heating element while including the heating element. According to clause 1,
The acidity regulator,
40 to 50 parts by weight of silica, 40 to 50 parts by weight of aluminum hydroxide, and 5 to 15 parts by weight of aluminum fluoride are heated at 900 to 1200°C for 1 to 3 hours and then ground to obtain mullite ( Step of manufacturing mullite);
Preparing an intermediate material by mixing 30 to 40 parts by weight of mullite, 30 to 40 parts by weight of lithium acetate, and 30 to 40 parts by weight of purified water at 50 to 70°C for 3 to 5 hours;
Characterized in that it is manufactured through the step of pressurizing 80 to 90 parts by weight of the intermediate material and 10 to 20 parts by weight of ethanol at 700 to 1000 ° C. and 500 to 800 bar to complete the acidity regulator. delete delete