KR101327776B1 - Composition of insulation sheet resin having high thermal resistance and high tensil strength, insulation sheet containg the same and preparing method thereof - Google Patents

Abstract

The present invention relates to a resin composition for an insulation sheet, the insulation sheet including the same, and a manufacturing method thereof and, more specifically, to the resin composition for the insulation sheet with an optimum composition ratio for manufacturing the insulation sheet containing excellent thermal resistance and high tension strength. The insulation sheet according to the present invention has excellent thermal resistance, tension strength, and surface strength and is not only useful for household appliances such as a rice cooker, a refrigerator, an air conditioner, a hot blast heater, and a gas range, but also useful for adiabatic materials and insulation parts of portable electronic products.

Description

Composition of insulation sheet resin having high thermal resistance and high tensil strength, Insulation sheet containg the same and Preparing method

The present invention not only has excellent heat resistance, but also relates to a heat insulating sheet having a high tensile strength, a heat insulating sheet resin composition for producing the same, and a method of manufacturing the heat insulating sheet.

In general, insulation is made of glass fiber, which is rapidly cooled by spraying compressed air into the molten glass liquid through a nozzle of high temperature, lowered in the head drum, and then binder in the glass wool from the head drum. Injecting the agent and passing it through the drying chamber using a conveyor belt makes it possible to produce insulation.

The insulation manufactured as described above is used as a heat insulating material and a sound absorbing material. As the heat insulating material, when used in household appliances (electric rice cookers, refrigerators, air conditioners, microwave ovens, hot air heaters, gas stoves) or boilers, the glass powder comes into contact with the skin and becomes hot. Will be damaged. In addition, the existing heat insulator has a low heat insulation effect, so the heat insulation and heat insulation effect only appears when the thickness of the heat insulator and the heat insulating material is thick, so that the exterior is large and the necessary interior is inevitably formed.

Recently, due to the rapid development of IT technology, portable information devices such as notebook computers, mobile phones, PDAs, and mobile phones are becoming thin, small, light, high functional, and high quality. As a result, portable information devices become smaller and thinner, and many unit parts required for high functionality and high quality are mounted in a small space. Here, the importance of the thermal management of the components of the portable information device is gradually increasing. In other words, the portable information device is precise due to the improved performance, and thus generates a lot of heat during operation. However, due to the miniaturized size, high heat is transmitted from the heat generating part by reducing the separation distance between the heat generating part and the outer case or between the heat generating part and the other parts, thereby degrading the performance of the product and adversely affecting the human body.

That is, heat generated in the heat generating unit inside the portable information device is transferred to the hard disk drive or the external expansion terminal of the notebook computer, which causes a problem that may cause damage and malfunction of the components. In addition, if heat of a heat generating unit such as a printed circuit board equipped with a CPU in the portable information device is not effectively controlled, heat generated inside the device is transferred to the external case, in which case the external case of the portable information device and the user's body Because heat is delivered to the direct contact area, there is a problem that can cause discomfort to the user, as well as safety accidents when used for a long time.

In addition, the existing heat insulating material for use in portable electronics, information equipment had a problem of poor mechanical properties such as tensile strength.

Accordingly, the inventors of the present invention have completed the present invention by knowing the method of manufacturing a heat insulating sheet having improved mechanical properties such as tensile strength and surface strength and increasing the heat resistance, and the optimum composition and composition ratio of the heat insulating sheet resin composition used therein. Was done.

The present invention for solving the above problems is a sheet liquid containing glass short fibers and water (H ₂ O) having an average length of 1 m / m to 40 m / m and an average thickness of 1 to 20 ㎛; And an inorganic binder containing at least one selected from liquid silicon oxide (SiO ₂ ), powder airgel, and liquid airgel.

In addition, the present invention relates to a heat insulating sheet, it may be characterized in that it comprises a nonwoven fabric molded of the heat insulating sheet resin composition.

In addition, the present invention relates to a method for producing the heat insulating sheet, by mixing the heat insulating sheet resin composition to prepare a heat insulating sheet resin; Manufacturing a non-woven sheet by laminating the insulating sheet resin through a conveyor while maintaining thickness and smoothness; And removing moisture from the sheet.

In addition, the present invention is another method for producing the insulating sheet is prepared by mixing the glass fiber and water (H ₂ O) having an average length of 1 m / m ~ 40 m / m and an average thickness of 1 ~ 20 ㎛ Making; Further adding and stirring water to the sheet liquid to prepare a mixed stabilized sheet liquid; Stacking the sheet liquid through a conveyor to maintain thickness and smoothness, thereby preparing a sheet in the form of a nonwoven fabric; Applying an inorganic binder to the nonwoven fabric sheet by a spray method; And removing moisture from the sheet.

In addition, the present invention is another method for producing the insulating sheet is a sheet liquid by mixing the glass short fibers and water (H ₂ O) having an average length of 1 m / m ~ 40 m / m and an average thickness of 1 ~ 20 ㎛ Manufacturing; Preparing a sheet in the form of a nonwoven fabric by laminating sheet liquid through a conveyor to maintain thickness and smoothness; And applying an inorganic binder to the sheet by spraying the inorganic binder onto the nonwoven fabric sheet after removing moisture from the sheet in the nonwoven fabric form.

Insulation sheet made of the insulation sheet resin composition of the present invention has a very high heat resistance (or flame retardancy) of 900 ℃ or more, even if a fire occurs due to fire prevention as well as other causes, to prevent the fire from being transferred to the back of the product It has a significant delay effect, and there is almost no toxic gas, so it is possible to get time for human evacuation, which can reduce human injury, and also has high tensile strength, surface strength bar, electric rice cooker, refrigerator, air conditioner, microwave oven, It is very suitable to be used as insulation parts and insulation materials for portable electric and electronic products as well as home appliances such as hot air heaters and gas stoves, boilers and gas stoves.

1 is a schematic side view of an apparatus used for producing the thermal insulation sheet of the present invention by a wet method.
2 is a plan schematic view of an apparatus used for producing the thermal insulation sheet of the present invention by a wet method.

The term "sheet" used in the present invention is a concept including various processed (or molded) forms such as a general sheet form and a nonwoven form.

The term "sheet liquid" used in the present invention means a mixed liquid of glass short fibers and water, and "insulated sheet resin" means an inorganic binder is added to the sheet liquid and a mixed liquid.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a heat insulating sheet comprising a nonwoven fabric, wherein the heat insulating sheet resin composition used to prepare the sheet is a sheet liquid containing short glass fibers and water (H ₂ O); And an inorganic binder containing at least one selected from liquid silicon oxide (SiO ₂ ), powder airgel, and liquid airgel.

The short glass fiber has an average length of 1 m / m to 40 m / m, preferably 5 m / m to 30 m / m, more preferably 10 m / m to 30 m / m If the average length exceeds 40 m / m, there may be a problem such as difficulty in handling due to low density, it is preferable to use a glass short fiber having the average length. In addition, the glass short fiber is preferably used having an average thickness of 1 to 20 ㎛, preferably 5 to 15 ㎛, if the average thickness is less than 1 ㎛, the manufacturing is difficult and the unit cost is too expensive, If it exceeds 20 μm, there may be a problem of inferior dispersibility, so it is preferable to use glass short fibers having the average thickness.

In the heat insulating sheet resin composition of the present invention, the sheet liquid contains 10,000 to 40,000 parts by weight of water with respect to 100 parts by weight of the short glass fibers, preferably 15,000 to 35,000 parts by weight of water, more preferably It is good to include 15,000 ~ 30,000 parts by weight, if the water is less than 10,000 parts by weight of the other compositions are not mixed well and the viscosity is too high moldability, and when used in excess of 40,000 parts by weight of the composition is too low to form rather It is good to use it within the said range since there exists a problem of inferiority. In addition, the amount of water is an amount including the amount of water used for preparing the initial sheet liquid and the amount of water additionally added for mixing stability, and 50% of the amount of water may be added in the mixing and stabilization process. That is, after mixing 10,000 to 20,000 parts by weight of water and / or an inorganic binder to 100 parts by weight of glass short fibers to prepare a sheet liquid or heat insulating sheet resin, the sheet liquid or heat insulating sheet for stabilizing the sheet liquid or heat insulating sheet resin 90 to 110 parts by weight of water (which is equivalent to about 10,000 to 20,000 of water per 100 parts by weight of short glass fiber) may be further added and stirred to stabilize the mixture.

In the heat insulating sheet resin composition of the present invention, the inorganic binder is 10 to 100 parts by weight, preferably 10 to 50 parts by weight, more preferably 10 to 10 parts by weight of the inorganic binder with respect to 100 parts by weight of the short glass fibers. If the amount of the inorganic binder is less than 10 parts by weight, the binding strength of the short glass fibers may be reduced and the heat resistance may be reduced to less than 800 ° C. Due to the high cost, there may be a problem in economics, and because the amount is too much used, there may be a problem that other physical properties are reduced, so it is better to use within the above range.

In addition, the airgel may be used in the form of powder or liquid, and when using a powder-type airgel, airgel beads and / or airgel powder may be used, and the airgel particles (including beads and / or powder) have a density of 0.01. It is preferable to use a thing of ˜0.5 g / cm 3.

In addition, the heat insulation sheet resin composition of the present invention may further include other additives according to the use thereof, etc., in addition to the composition described above, such additives include a dispersant containing polyethylene oxide, polyethylene derivative or sulfuric acid; Antioxidants; Lubricant; And crosslinking agents; May be used.

Hereinafter, a method of manufacturing an insulation sheet using the insulation sheet resin composition will be described.

Insulation sheet of the present invention can be largely manufactured by three wet methods, 1) by mixing a sheet liquid and an inorganic binder to prepare an insulation sheet resin, and then molding it to produce a non-woven insulation sheet, 2 ) Forming sheet liquid into a nonwoven fabric in a molding machine, and then applying (or impregnating) an inorganic binder with a spray method before removing water, and preparing a nonwoven fabric insulating sheet, 3) mixing and stabilizing the sheet liquid, and then molding the sheet liquid. After molding and moisture removal in the form of a nonwoven fabric, there is a method of applying (or impregnated) the inorganic binder to the non-woven insulation sheet by the spray method.

The three methods will be described in more detail below.

Preparing a heat insulation sheet resin by mixing the heat insulation sheet resin composition of various forms described above; Forming a non-woven sheet by molding the insulating sheet resin; And removing the moisture from the sheet; can be prepared through the process comprising a heat insulating sheet of the present invention.

The preparing of the insulating sheet resin may further include adding 90 to 110 parts by weight of water based on 100 parts by weight of the insulating sheet resin to stabilize the mixing.

In the present invention, the composition, composition ratio and characteristics of the heat insulating sheet resin composition are the same as described above. In the step of preparing the insulating sheet resin by mixing the insulating sheet resin composition, the insulating sheet resin composition is added to the mixing tank 10 shown in FIGS. 1 and / or 2, and then mixed with the mixer 11. Then, the mixture mixed by the mixing process of the mixing tank 10 is pumped to the mixing stabilization tank through the filter 17 by using the pump 15, in which the glass short fibers in the filter 17. The impurities are removed and introduced into the mixed stabilization tank 20.

In addition, the step of stabilizing the mixing is carried out in the mixing stabilization tank 20, after further adding water to the mixed heat insulating sheet resin composition, and slowly mixed with a mixer 21 to stabilize. At this time, the additional amount of water is preferably added to the water corresponding to 90 to 110 parts by weight with respect to 100 parts by weight of the mixed insulating sheet resin composition.

In addition, the step of stabilizing the mixing is preferably 0 to 50 ℃, preferably 10 to 40 ℃, the mixing stability of the mixer at a stirring speed of 50 to 400 rpm / minute, if the stirring speed is less than 50 rpm / minute There may be a problem that the heat insulation sheet resin composition is agglomerated, there may be a problem that bubbles, such as when exceeding 400rpm / min it is preferable to perform the mixing stabilization step under the above conditions.

Next, the step of forming the mixed stabilized composition to form a sheet, the pumped to the molding machine 30 by the mixed stabilized composition to the molding machine 30 is forced to transfer to the forming pressure plate 31 of the molding machine 30 By the nonwoven fabric sheet.

The sheet formed by the molding press plate 31 is discharged in the form of a nonwoven fabric in a state similar to a sol, and the sheet is transferred to the drying chamber 40 while removing the water through the conveyor belt 32. Drying makes it possible to produce a fully sheeted solid insulation sheet. In addition, the drying time may be shortened by forcibly inhaling and discharging the moisture of the sheet discharged in the sol state by the vacuum suction unit 33 installed at the lower portion of the conveyor belt 32.

Referring to another method (2) of manufacturing the insulating sheet of the present invention, the step of preparing a sheet liquid by mixing the glass short fibers and water (H ₂ O); Further adding and stirring water to the sheet liquid to prepare a mixed stabilized sheet liquid; Manufacturing a non-woven sheet by laminating the insulating sheet resin through a conveyor to maintain thickness and smoothness; Applying an inorganic binder to the nonwoven fabric sheet by a spray method; And removing moisture of the sheet.

In addition, the inorganic binder may be used 10 to 100 parts by weight, preferably 10 to 50 parts by weight, more preferably 40 parts by weight with respect to 100 parts by weight of glass short fibers.

In addition, the method may further include drying after removing the moisture.

Here, the average length and thickness of the glass short fibers are the same as described above.

In the preparing of the sheet liquid, the sheet liquid is added to the mixing tank 10 and then mixed with the mixer 11. Then, the mixture mixed by the mixing process of the mixing tank 10 is pumped to the mixing stabilization tank through the filter 17 by using the pump 15, in which the glass short fibers in the filter 17. The impurities are removed and introduced into the mixed stabilization tank 20.

The mixing stabilization step is carried out in the mixing stabilization tank 20, after further adding water to the mixed sheet liquid, and slowly mixed with the mixer 21 to stabilize.

In addition, the step of stabilizing the mixing is preferably 0 to 50 ℃, preferably 10 to 40 ℃, the mixing stability of the mixer at a stirring speed of 50 to 400 rpm / minute, if the stirring speed is less than 50 rpm / minute There may be a problem that the heat insulation sheet resin composition is agglomerated, there may be a problem that bubbles, such as when exceeding 400rpm / min it is preferable to perform the mixing stabilization step under the above conditions.

Next, the step of forming the mixed stabilized composition to form a sheet, the pumped to the molding machine 30 by the mixed stabilized composition to the molding machine 30 is forced to transfer to the forming pressure plate 31 of the molding machine 30 By the nonwoven fabric sheet.

The sheet formed by the molding press plate 31 is discharged in the form of a nonwoven fabric in a state similar to a sol, and the sheet is transferred to the drying chamber 40 while removing the water through the conveyor belt 32. After drying, it is possible to prepare a heat insulating sheet in a solid sheet state.

At this time, the inorganic binder is applied (or impregnated) to the discharged nonwoven fabric at the same time as the discharge of the nonwoven fabric and the conveyance of the conveyor belt.

In addition, the drying time may be shortened by forcibly inhaling and discharging the moisture of the sheet discharged in the sol state by the vacuum suction unit 33 installed at the lower portion of the conveyor belt 32.

Another method (3) of manufacturing the insulating sheet of the present invention will be described in detail, comprising: preparing a sheet liquid by mixing short glass fibers and water (H ₂ O); Preparing a sheet in the form of a nonwoven fabric by laminating sheet liquid through a conveyor to maintain thickness and smoothness; And removing the moisture of the nonwoven fabric sheet and applying an inorganic binder to the sheet of the nonwoven fabric by spraying to apply the inorganic binder to the sheet.

The preparing of the sheet liquid may further include mixing and stabilizing the mixture by further adding 90 to 110 parts by weight of water based on 100 parts by weight of the insulating sheet resin.

In addition, the inorganic binder may be used 10 to 100 parts by weight, preferably 10 to 50 parts by weight, more preferably 40 parts by weight with respect to 100 parts by weight of glass short fibers.

In addition, the method may further include drying after applying.

Here, the average length and thickness of the glass short fibers are the same as described above.

The step of preparing the sheet liquid and the step of stabilizing the mixture can be carried out through the mixing tank 10, the mixed stabilization tank 20, as in the method for producing the insulating sheet of the present invention (method 1), When the mixed-stabilized sheet liquid is pumped to the molding machine 30 by the pump 25 and forcedly transferred, the sheet liquid is molded into a non-woven sheet or the like by the molding pressure plate 31 of the molding machine 30.

Then, after removing the water through the discharge conveyor belt 32 in a non-woven sheet form similar to the sol (sol) formed by the molding pressing plate 31, before the drying chamber 40 is transferred to the inorganic After the binder is applied (or impregnated) to the moisture-removed sheet, the binder is transferred to the drying chamber 40 and dried to prepare a thermally insulating sheet in a completely sheeted solid state. In addition, the drying time may be shortened by forcibly inhaling and discharging the moisture of the sheet discharged in the sol state by the vacuum suction unit 33 installed at the lower portion of the conveyor belt 32.

Insulating sheet of the non-woven fabric of the present invention prepared by the three methods described above is molded to a specific gravity of 100 ~ 200 K and an average thickness of 2 to 20 mm, preferably to a specific gravity of 120 to 150 K and an average thickness of 2 to 15 mm Molding is good, but if the specific gravity is less than 50K may have a problem of degradation of quality, excessive volume due to low density, may exceed the problem of unit cost, such as higher than 200K. In addition, if the average thickness is less than 2 mm, there may be a problem that the strength is not good, and if the average thickness exceeds 20 mm, it is disadvantageous to peeling, it is preferable to mold to have a specific gravity and the average thickness within the above range.

Insulating sheet of the present invention prepared in this way may have a heat resistance of at least 1,000 ℃, preferably 1,000 ℃ to 1,200 ℃ when measured according to the KS C IEC 60085 method. In addition, the thermal insulation sheet of the present invention may have a longitudinal direction of 350 ~ 430 N / ㎝, and a width direction 360 ~ 450 N / ㎝ when the tensile strength is 6 mm when measured by the KS F 4911 method.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail based on an Example. However, the scope of the present invention is not limited by the following examples.

[Example]

Example 1: Preparation of Resin for Heat Insulation Sheet

A sheet liquid was prepared by adding and mixing 100 parts by weight of short glass fibers having an average length of 25 m / m and an average thickness of 12 μm and 12,000 parts by weight of water to the mixing tank 10.

Next, 10 parts by weight of liquid silicon oxide (manufactured by Seyeon Trading Co., Ltd.) and 30 parts by weight of aerogel in powder form having a density of 0.2 g / cm 3 were added to 100 parts by weight of the short glass fibers, followed by stirring and mixing for 30 minutes with a blender. Insulation sheet resin was prepared.

Examples 2 to 4

To prepare a resin for a thermal insulation sheet in the same manner as in Example 1, to prepare a resin for a thermal insulation sheet so as to have a composition ratio as shown in Table 1 to Examples 2 to 4.

Example 5

In the same manner as in Example 1 to prepare a resin for insulating sheets, using an average length of 20 m / m, an average thickness of 8 ㎛ instead of glass short fibers having an average length of 25 m / m, average thickness 12 ㎛ , Example 5 was prepared to prepare a resin for a thermal insulation sheet to have a composition ratio as shown in Table 1.

Example 6

In the same manner as in Example 1 to prepare a resin for insulating sheets, using an average length of 30 m / m, an average thickness of 12 ㎛ instead of glass short fibers of average length 25 m / m, average thickness 12 ㎛ , Example 6 was prepared to prepare a resin for a thermal insulation sheet to have a composition ratio as shown in Table 1.

Comparative Example 1

Prepare resin for insulation sheet in the same manner as in Example 1, but using an average length of 50 m / m, an average thickness of 12 ㎛ instead of glass short fibers having an average length of 25 m / m, an average thickness of 12 ㎛ , Comparative Example 1 was prepared by preparing a resin for a thermal insulation sheet to have a composition ratio as shown in Table 1.

Comparative Example 2

In the same manner as in Example 1 to prepare a resin for insulating sheets, using an average length of 25 m / m, an average thickness of 12 ㎛ instead of glass short fibers having an average length of 25 m / m, the average thickness of 24 ㎛ , Comparative Example 2 was prepared by preparing a resin for heat insulating sheet to have a composition ratio as shown in Table 1.

Comparative Example 3 to Comparative Example 4

To prepare a resin for a thermal insulation sheet in the same manner as in Example 1, to prepare a resin for a thermal insulation sheet having a composition as shown in Table 1 to carry out Comparative Examples 3 to 4.

division
(Unit: wt%) Glass fiber water Liquid
Silicon oxide Aerogels Example 1 100 12,000 10 30 Example 2 100 12,000 20 40 Example 3 100 12,000 30 50 Example 4 100 12,000 50 30 Example 5 100 12,000 50 50 Example 6 100 12,000 10 5 Example 7 100 12,000 50 - Example 8 100 12,000 - 50 Comparative Example 1 100 12,000 10 30 Comparative Example 2 100 12,000 10 30 Comparative Example 3 100 12,000 5 - Comparative Example 4 100 12,000 - 5

Manufacturing example  One: Insulation sheet  Produce

The resin for the insulating sheet prepared in Example 1 was removed through the filter 17 to remove impurities in the glass short fibers, and then introduced into the mixed stabilization tank 20. Next, 12,000 parts by weight of water was added to the mixed stabilization tank based on 100 parts by weight of the resin for heat insulating sheet, and then mixed and stabilized for 5 hours while stirring at a stirring speed of 80 rpm per minute under 37 ° C.

Next, the mixed stabilized composition was transferred to the molding machine 30, and then molded (nonwoven fabric form) into a sol sheet by the molding press plate 31 of the molding machine 30.

Next, the sol sheet was transferred to the drying chamber 40 through the conveyor belt 32. At this time, the moisture of the sheet discharged in the sol state by the vacuum suction unit 33 installed at the bottom of the conveyor belt is forced. Inhaled and discharged, and then dried at 40 ° C. for 1 hour to prepare a thermally insulating sheet in the form of a solid sheet.

The prepared insulation sheet had a specific gravity of 125 K and an average thickness of 4 mm.

Preparation Examples 2 to 8 and Comparative Production Examples 1 to 4

Insulating sheets were prepared using the insulating sheet resins of Examples 2 to 8 and Comparative Examples 1 to 4 in the same manner as in Preparation Example 1, respectively. In addition, specific gravity and average thickness of the manufactured insulation sheet are shown in Table 2 below.

Production Example 9

The sheet liquid prepared in Example 1 was removed through the filter 17 to remove impurities in the glass short fibers, and then introduced into the mixed stabilization tank 20. Next, 98 parts by weight of water was added to the mixed stabilization tank with respect to 100 parts by weight of the sheet liquid, and then mixed and stabilized for 5 hours while stirring at a stirring speed of 80 rpm per minute under 37 ° C.

Next, after the mixed stabilized composition is transferred to the molding machine 30, the sheet liquid-containing component is discharged into a sol-like sheet by the molding press plate 31 of the molding machine 30. To 100 parts by weight of glass short fibers, 10 parts by weight of liquid silicon oxide (manufactured by Se-Yeon Corp.) and 30 parts by weight of aerogel in powder form having a density of 0.2 g / cm 3 were applied to the sheet discharged by the spray method.

Next, the inorganic binder-coated sol sheet was transferred to the drying chamber 40 while removing moisture through the conveyor belt 32, and at this time, the sol was vacuumed to the vacuum inhaler 33 installed at the bottom of the conveyor belt. The moisture of the sheet discharged in the state is forcibly sucked and discharged, and then dried at 40 ° C. for 1 hour to prepare a heat insulating sheet in a completely sheeted solid state.

The prepared insulation sheet had a specific gravity of 126 K and an average thickness of 4.8 mm.

Production Example 10

The sheet liquid prepared in Example 1 was removed through the filter 17 to remove impurities in the glass short fibers, and then introduced into the mixed stabilization tank 20. Next, 98 parts by weight of water was added to the mixed stabilization tank with respect to 100 parts by weight of the sheet liquid, and then mixed and stabilized for 5 hours while stirring at a stirring speed of 80 rpm per minute under 37 ° C.

Next, the mixed and stabilized sheet liquid was transferred to the molding machine 30, and then molded into a sol state sheet (nonwoven fabric form) by the molding press plate 31 of the molding machine 30.

Next, the sol sheet is transferred to the drying chamber 40 while removing moisture through the conveyor belt 32, and the sol sheet is transferred to the drying chamber through the conveyor belt before the inorganic chamber is added. Sprayed on, the inorganic binder was applied to the sheet.

At the same time, the suction of the sheet discharged in the sol state by the vacuum suction unit 33 installed at the bottom of the conveyor belt forcibly sucked and discharged, and then dried for 1 hour at 40 ℃ solid sheet insulation sheet Was prepared. The prepared insulating sheet had a specific gravity of 121 K and an average thickness of 4.3 mm.

In this case, the inorganic binder is a mixture of 10 parts by weight of liquid silicon oxide (manufactured by Seyeon Trading Co., Ltd.) and 30 parts by weight of aerogel in a powder form having a density of 0.2 g / cm 3 with respect to 100 parts by weight of glass short fibers as a sheet liquid-containing component. It was.

division Average weight Average thickness Production Example 1 125 K 4.0 mm Production Example 2 129 K 5.1 mm Production Example 3 138 K 5.0 mm Production Example 4 145 K 5.2 mm Production Example 5 168 K 4.8 mm Production Example 6 102 K 5.3 mm Production Example 7 130 K 4.5 mm Production Example 8 127 K 4.9 mm Production Example 9 126 K 4.8 mm Production Example 10 121 K 4.3 mm Comparative Preparation Example 1 94 K 15.9 mm Comparative Production Example 2 122 K 5.3 mm Comparative Production Example 3 58 K 6.1 mm Comparative Production Example 4 49 K 5.5 mm

Experimental Example  1: heat resistance measurement experiment

Measurement of the heat resistance of the insulating sheet prepared in Preparation Examples 1 to 8 and Comparative Preparation Examples 1 to 4 was performed by the following method, and the results are shown in Table 3 below. And heat resistance measurement was measured based on KS C IEC 60085 method.

Experimental Example 2 Tensile Strength Measurement Experiment

Tensile strength of the insulation sheet prepared in Preparation Examples 1 to 8 and Comparative Preparation Examples 1 to 4 was performed by the following method, and the results are shown in Table 3 below. Tensile strength was measured according to KS F 4911.

division Heat resistance (℃) Tensile Strength ( N / cm ) Longitudinal direction Width direction Production Example 1 1,008 384 397 Production Example 2 1,023 372 391 Production Example 3 1,038 369 390 Production Example 4 1,043 358 379 Production Example 5 1,068 405 414 Production Example 6 915 417 420 Production Example 7 950 405 414 Production Example 8 1,002 417 420 Production Example 9 1,010 371 390 Production Example 10 929 355 372 Comparative Preparation Example 1 939 302 325 Comparative Production Example 2 851 352 348 Comparative Production Example 3 798 358 369 Comparative Production Example 4 875 360 375

Looking at the experimental results of Table 3, it was confirmed that all of the heat insulating sheets of the embodiment had excellent tensile strength while having heat resistance of 900 ℃ or more. However, in comparison with Example 1, in Comparative Preparation Example 1 using 50 m / m short glass fibers having an average length of more than 40 m / m, the heat resistance was excellent, but the tensile strength was not good, and the average thickness was 20 μm. In Comparative Production Example 2 using short glass fibers having an average thickness of 24 μm exceeding, heat resistance and tensile strength were not good. This was due to the poor dispersibility of the short glass fibers, resulting in agglomeration of short glass fibers, resulting in heat resistance and tensile strength. I think it is not good. And, in Comparative Preparation Example 3 and Comparative Example 4 using an inorganic binder less than 10 parts by weight, the heat resistance was poor compared to the Example.

Insulation sheet of the present invention through the above examples and experimental examples has a very high heat resistance, tensile strength bar, electric rice cooker, refrigerator, air conditioner, microwave oven, hot air heater, gas stove, etc. requiring heat resistance and mechanical properties, In addition to heating products such as boilers and stoves, it is expected to be widely used as insulation parts and insulation materials for portable electric and electronic products.

10: mixing tank 11, 21: blender
15, 25: pump 17: strainer
20: mixed stabilization tank 30: molding machine
31: forming pressing plate 32: conveyor belt
33: vacuum inhaler 40: drying chamber

Claims (18)

A sheet liquid containing 10,000 to 40,000 parts by weight of water (H ₂ O) based on 100 parts by weight of short glass fibers having an average length of 1 m / m to 40 m / m and an average thickness of 1 to 20 μm; And
Inorganic binders containing at least one selected from liquid silicon oxide (SiO ₂ ), powder airgel and liquid airgel;
High heat resistance high tensile strength insulation sheet resin composition comprising a. delete The method of claim 1,
The heat resistant high tensile strength thermal insulation sheet resin composition comprising 100 to 100 parts by weight of the inorganic short fiber, based on 100 parts by weight of the short glass fibers. The method of claim 1,
Dispersants containing polyethylene oxide, polyethylene derivatives or sulfuric acid; Antioxidants; Lubricant; And crosslinking agents; Heat-resistant high tensile strength insulation sheet resin composition, characterized in that it further comprises an additive containing at least one selected from. A heat resistant high tensile strength heat insulating sheet, wherein the heat insulating sheet resin composition of any one of claims 1, 3 and 4 is molded. The method of claim 5, wherein the insulating sheet is in the form of a non-woven fabric,
Heat-resistant high tensile strength insulation sheet, characterized in that the specific gravity 100 ~ 200 K and the average thickness 2 ~ 20 mm. According to claim 5, wherein the total weight of the insulating sheet
5 to 30% by weight of an inorganic binder containing at least one selected from liquid silicon oxide (SiO ₂ ), powder airgel and liquid airgel,
Heat-resistant high tensile strength insulation sheet, characterized in that containing 1 to 3% by weight of water. The method according to claim 6,
Heat resistant high tensile strength insulation sheet, characterized in that the heat resistance 900 ℃ ~ 1,000 ℃ measured by the IEC 60085 method.
The method according to claim 6,
Insulation sheet, characterized in that in the longitudinal direction of 350 ~ 430 N / cm, the width direction 360 ~ 450 N / cm when the tensile strength is 6 mm when measured by the KS F 4911 method. Preparing a heat insulating sheet resin by mixing the heat insulating sheet resin composition of any one of claims 1, 3, and 4;
Manufacturing a non-woven sheet by laminating the insulating sheet resin through a conveyor while maintaining thickness and smoothness; And
Removing moisture from the sheet;
Method of manufacturing a thermal insulation sheet comprising a. The method of claim 10, wherein the preparing of the insulating sheet resin further comprises adding 90 to 110 parts by weight of water to 100 parts by weight of the insulating sheet resin to stabilize the mixture;
Method of manufacturing a thermal insulation sheet further comprising a. The method of claim 10,
The removing of the water further comprises the step of removing the water from the formed non-woven fabric sheet using a vacuum inhaler. Preparing a sheet liquid by mixing 10,000 to 40,000 parts by weight of water (H ₂ O) with respect to 100 parts by weight of short glass fibers having an average length of 1 m / m to 40 m / m and an average thickness of 1 to 20 μm;
Further adding and stirring water to the sheet liquid to prepare a mixed stabilized sheet liquid;
Preparing a sheet in the form of a nonwoven fabric by laminating sheet liquid through a conveyor to maintain thickness and smoothness;
Applying an inorganic binder to the nonwoven fabric sheet by a spray method; And
Removing moisture from the sheet;
Method of manufacturing a thermal insulation sheet comprising a. The method of claim 13, wherein the inorganic binder comprises 10 to 100 parts by weight based on 100 parts by weight of glass short fibers. The method of claim 13,
The step of removing the water is a step of removing the water from the molded non-woven sheet in the form of a vacuum inhaler; manufacturing method of a thermal insulation sheet further comprising a.
Preparing a sheet liquid by mixing 10,000 to 40,000 parts by weight of water (H ₂ O) with respect to 100 parts by weight of short glass fibers having an average length of 1 m / m to 40 m / m and an average thickness of 1 to 20 μm;
Preparing a sheet in the form of a nonwoven fabric by laminating sheet liquid through a conveyor to maintain thickness and smoothness; And
Removing moisture of the nonwoven fabric sheet and then applying an inorganic binder to the nonwoven fabric sheet by a spray method; And
Method of manufacturing a thermal insulation sheet comprising a. The method of claim 16, wherein the preparing of the sheet liquid further comprises adding 90 to 110 parts by weight of water to 100 parts by weight of the sheet liquid to stabilize the mixture;
Method of manufacturing a thermal insulation sheet further comprising a. 17. The method of claim 16,
The removal of the water is a method of manufacturing a thermal insulation sheet, characterized in that to remove the moisture from the non-woven fabric sheet using a vacuum inhaler.

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