KR101403289B1 - Incombustible insulation materials with vibration preventing in an extremely low temperature and manufacturing process of it - Google Patents

Abstract

The present invention relates to a non-combustible heat insulating material excellent in impact resistance at a cryogenic temperature and a method for producing the same, and more particularly, After the punching composite nonwoven fabric was manufactured, the polypropylene fibers contained in the needle punching composite nonwoven fabric were melted by using a heating apparatus at a temperature of 200 to 300 DEG C, the nonflammable aluminum thin film was placed on both surfaces of the needle punching composite nonwoven fabric , And is compacted to a thickness of 1.5 to 4.5 mm using a cooling roll having a temperature of 0 to 100 캜.
After the needle punching composite nonwoven fabric is formed, the orientation direction of the fibers in the composite nonwoven fabric is adjusted in the thickness direction through the hook needle. The glass fibers are A, C, E, S-glass, The thickness of the thin film is 5 to 300 mu m, and the thickness of the needle punching composite nonwoven fabric is 5 to 12 mm and the unit weight is 300 to 1,200 g / m < ^{2 &} gt ;.
The non-incombustible insulation material excellent in impact resistance at a cryogenic temperature produced by the production method of the present invention is basically made of a needle punching composite nonwoven fabric composed of a mixed composition of glass fiber and polypropylene fiber and heating the polypropylene at a melting temperature and time Even if the polypropylene fiber contained in the inner composite nonwoven fabric is squeezed by heating under pressure with a strong pressure, the composite nonwoven fabric in which the polypropylene is melted by heating is pressed against the surface of the composite nonwoven fabric, It is impossible to form a continuous phase matrix in which the propylene component can physically connect all the glass fibers in the composite nonwoven fabric and at the same time the glass fibers form a continuous phase and the polypropylene is connected in a non-continuous phase, Space to form and glass island Since the physical approach between the monofilaments is structured closer to that before the heating, the glassy phase behavior of the polypropylene at a temperature lower than the glass transition temperature does not appear even at a cryogenic temperature, and the inherent characteristics of the glass fiber laminate There are characteristics.
In addition, the non-flammable heat insulation material of the present invention exhibits excellent heat insulation due to the void space between the laminated fiber filaments and at the same time exhibits excellent low-temperature flexibility and impact characteristics. Further, the meta-aramid fiber, The aluminum foil on the surface and the low polypropylene content are excellent in that they can exhibit excellent flame retardancy even in a welding environment that can be encountered during the construction process .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an incombustible insulation material excellent in impact resistance at a cryogenic temperature and a method of manufacturing the incombustible insulation material,

The present invention relates to an incombustible insulation material excellent in impact resistance at a cryogenic temperature and a method for producing the same, and it is possible to provide a non-combustible insulation material which is free from a general heat insulation application which maintains or protects a pleasant environment from a hot environment in which a glass- The present invention relates to a heat insulating material having properties suitable for various types of cold storage applications that protect the low temperature environment of the room from external environment.

As the demand for room temperature gas fuels, which are more clean than the oil system energy that is commonly used, increases, the use of gas fuels such as butane, propane, and natural gas increases, and in such storage, transportation, And the need for heat insulation and protection for containers has been increasing, there has been actively developed suitable heat insulating materials, protective materials, storage containers, and the like. However, various auxiliary materials such as heat insulation, dustproof, fire retardant, and protection for securing stability in such a cryogenic condition have been used by supplementing cryogenic characteristics using conventional insulation materials, dustproof materials, fire retardant materials and protective materials.

In US Pat. No. 6,035,795 (patent: Mar. 14, 2000), a sandwich foam and a glass fiber reinforced composite material are proposed as a thermal insulation material for a tank of a liquefied natural gas carrier, It is difficult to expect a vibration-proof property that can be protected by an external impact in a cryogenic temperature state. Further, Korean Patent No. 10-0278364 (registered on October 18, 2000) A rigid polyurethane composition using a fiber reinforcing material for preventing shrinkage and maintaining a high degree of cure at a very low temperature is proposed in the urethane composition composed of polymeric methylene diphenyl diisocyanate having a functional group number of 2.6 to 3.0 in the polyol and is disclosed in U.S. Patent No. 10-0542145 : On January 1, 2006, water was used in place of the fluorocarbon type blowing agent, which is an environmentally harmful substance, and the use of the fiber reinforcing material The prior art will be both to secure a dimensional stability in the cryogenic propose a method to compensate and to, but however, it is difficult to expect a shock-resistant properties in addition to insulating properties.

In order to solve these problems, the non-combustible thermal insulation material excellent in impact resistance at the cryogenic temperature of the present invention has excellent thermal insulation characteristics at a very low temperature due to a small change in mechanical characteristics from high temperature to extremely low temperature, It should be stable to the flame generated in the welding process, and it should be excellent in anti-vibration property because the applied insulation is protected from external impact at cryogenic temperature. For this purpose, the brittleness should not increase rapidly even at a cryogenic temperature, and the brittleness at room temperature should be maintained. In particular, in order to be used as a thermal insulation material for a tank of a liquefied natural gas carrier, it is necessary to easily adjust the thickness of a heat insulation material suitable for a thin space to a desired thickness.

It is an object of the present invention to provide a glass fiber reinforced thermoplastic material which is excellent in nonflammability and which is based on ordinary felt-type glass fiber insulation which hardly changes form and characteristics from high temperature to extremely low temperature, And an additional third fibrous phase is used to impart impact prevention and anti-vibration characteristics, and excellent vibration damping properties, so that brittleness does not increase rapidly even at a cryogenic temperature, and the brittleness at room temperature is maintained. In particular, the present invention relates to a method of manufacturing a non-combustible thermal insulation material excellent in impact resistance at a cryogenic temperature, which utilizes both a superior surface flammability characteristic and a complementary countermeasure against a physical form that increases impact response characteristics due to a structural change of a fiber laminate, .

In order to achieve the above object, the present invention provides a method of manufacturing a non-combustible thermal insulation material excellent in impact resistance at a cryogenic temperature, the method comprising the steps of: 50 to 80% by weight of glass fibers; 10 to 40% by weight of polypropylene fibers; %, A polypropylene fiber contained in the needle punching composite nonwoven fabric is melted by using a heating apparatus at a temperature of 200 to 300 DEG C, a non-incombustible aluminum sheet is formed on both surfaces of the needle punching composite nonwoven fabric, The thin film is placed thereon and then pressed to a thickness of 1.5 to 4.5 mm using a cooling roll having a temperature of 0 to 100 캜.

After the needle punching composite nonwoven fabric is formed, the orientation direction of the fibers in the composite nonwoven fabric is adjusted in the thickness direction through the hook needle. The glass fibers are A, C, E, S-glass, The thickness of the thin film is 5 to 300 mu m, and the thickness of the needle punching composite nonwoven fabric is 5 to 12 mm and the unit weight is 300 to 1,200 g / m < ^{2 &} gt ;.

The non-incombustible insulation material excellent in impact resistance at a cryogenic temperature produced by the production method of the present invention is basically made of a needle punching composite nonwoven fabric composed of a mixed composition of glass fiber and polypropylene fiber and heating the polypropylene at a melting temperature and time Even if the polypropylene fiber contained in the inner composite nonwoven fabric is squeezed by heating under pressure with a strong pressure, the composite nonwoven fabric in which the polypropylene is melted by heating is pressed against the surface of the composite nonwoven fabric, It is impossible to form a continuous phase matrix in which the propylene component can physically connect all the glass fibers in the composite nonwoven fabric and at the same time the glass fibers form a continuous phase and the polypropylene is connected in a non-continuous phase, Space to form and glass island Since the physical approach between the monofilaments is structured closer to that before the heating, the glassy phase behavior of the polypropylene at a temperature lower than the glass transition temperature does not appear even at a cryogenic temperature, and the inherent characteristics of the glass fiber laminate There are characteristics.

In addition, the non-flammable heat insulation material of the present invention exhibits excellent heat insulation due to the void space between the laminated fiber filaments and at the same time exhibits excellent low-temperature flexibility and impact characteristics. Further, the meta-aramid fiber, The aluminum foil on the surface and the low polypropylene content are excellent in that they can exhibit excellent flame retardancy even in a welding environment that can be encountered during the construction process .

Hereinafter, a method of manufacturing a non-combustible thermal insulating material excellent in impact resistance at a cryogenic temperature according to the present invention will be described. It should be understood that the present invention is not limited to the above- And this does not mean that the technical idea and scope of the present invention are limited.

The method for producing a non-combustible insulation material excellent in impact resistance at a cryogenic temperature according to the present invention is characterized by comprising 50 to 80% by weight of a glass fiber which is excellent in incombustibility and hardly changes form and characteristics from high temperature to extremely low temperature, 10 to 40% by weight, and 0 to 10% by weight of meta-aramid fibers are formed, and then the polypropylene fibers contained in the needle punching composite nonwoven fabric are heated at a temperature of 200 to 300 ° C Melting nonwoven fabric, placing the incombustible aluminum thin film on both surfaces of the needle punching composite nonwoven fabric, and then pressing the mixture to a thickness of 1.5 to 4.5 mm using a cooling roll having a temperature of 0 to 100 캜.

The needle punching composite nonwoven fabric prior to hot pressing according to the present invention is manufactured from 50 to 80% by weight of glass fiber, 10 to 40% by weight of polypropylene fiber and 0 to 10% by weight of meta-aramid fiber, When a loop is formed in a hook needle process using a composite nonwoven fabric and then a hot pressing process is applied, excellent impact resistance characteristics can be obtained.

In the needle punched composite nonwoven fabric, when the glass fiber content is less than 50% by weight or the content of the polypropylene fiber is more than 40% by weight, it is difficult to have an excellent impact preventing property at an extremely low temperature, If the content of fibers is more than 80% by weight or the content of polypropylene is less than 10% by weight, it is difficult to form a desired thickness in the subsequent hot pressing step. In addition, the amount of the meta-aramid fiber which can be additionally used for improving the vibration damping property shows a certain degree of vibration-transmitting property even if only a small amount of the meta-aramid fiber is used in addition to the composite nonwoven fabric made of glass fiber. However, There is a disadvantage that the impact-preventing characteristic at a cryogenic temperature is lowered rather. However, in the present invention, when the meta-aramid fiber is not used, the unit weight (g / m < ² >) of the composite nonwoven fabric is increased in order to realize the heat insulating effect and the low- It has been studied that the thickness (mm) of the thin film or nonwoven fabric should be further increased (see Example 3 below).

The glass fiber that can be used in the present invention is not particularly limited and is mainly glass fiber, carbon fiber, carbon stabilized fiber, basalt fiber and silica fiber. Depending on the application, it may be subdivided into A, C, E, S, AR and the like, but E-glass fiber is preferably the best. The reason for this is that E-glass is advantageous in strength compared to glass fibers of other compositions and can exhibit high strength even with a small glass fiber content, contributing to weight reduction of the product.

For the above reasons, the glass fibers mainly used in the present invention were cut into 5 to 10 cm long glass fibers for the carding process for producing needle punching composite nonwoven fabric as E-glass fibers having a diameter of 7 to 20 μm, The fiber is preferably a long fiber type glass fiber for the strength characteristic. In the case of the short fiber, the fiber diameter is distributed and the strength is poor. It is difficult to adjust the fiber to a desired length for carding, A problem of deterioration may occur.

For reference, the glass fiber refers to glass in the form of fiber formed by molding very long and then quenched. Glass fibers are divided into short fibers used as insulating sound absorbing materials and long fibers used as various resin reinforcing materials according to their shapes and production methods. Generally, short fibers are used as glass wool, long fibers are used as glass fibers ). It is classified into A-Glass, C-Glass, E-Glass, S-Glass and AR-Glass depending on its composition. E-glass, which is the first of long fiber glass fibers, is evaluated as a material that has excellent stability at high temperature and low electric conductivity because of almost no alkali component. E-Glass has been used as a resin reinforcing agent to reinforce resin since the 1930s when thermosetting resin was developed. It has been used for various electrical and electronic products using electrical insulation, and also for aircraft parts requiring high strength.

In the present invention, the components usable as an organic material for holding the fiber phase constituting the inorganic fiber-based insulating material with a proper bonding force include polyethylene, polypropylene, EVA, polyvinyl chloride, thermoplastic polyurethane, low melting point polyester, polyamide, In the present invention, since the inorganic fiber-based heat insulating material is manufactured by the carding process, it is more effective to use the organic material having the fibrous shape of the same type, and the polypropylene fiber is most advantageous in the melt bonding property .

The polypropylene fiber used in the present invention is a conventional homopolypropylene component having a melting point of 170 DEG C and may be a copolypropylene having a slightly lower melting point. 6 to about 6 / cm, more preferably about 4 to about 5 / cm. In the case where the flameproofing treatment is small, the web formation is limited. When the flameproofing treatment is too small, Which is undesirable. The thickness of the fiber is preferably in the range of 5 to 10 denier, and most preferably in the range of 6 to 8 denier (D: in the case of denier, the yarn weight is 1 g and the yarn weight is 1 denier and 2 g is 2 denier per 90,000 m) . When the denier is 5 or less, the carding properties are deteriorated when mixed with glass fiber. When the denier is 10 or more, necessary polypropylene fibers are used and the low-temperature impact preventing property is lowered in the end use, It is necessary to have proper thickness. The length of the polypropylene fiber is preferably 40 to 70 mm. If the length is too short, the web formation is restricted. If the length is too long, it is difficult to obtain a uniform mixing degree.

The aramid fiber can be used as a third fiber component that can be used to supplement the vibration damping characteristics. The aramid is divided into a meta system and a para system depending on the structure. Since the structure does not require a particularly high strength, It is better to use aramid fiber.

The thickness of the meta-aramid fiber that can be used in the present invention is suitably from 0.9 to 5.0 dTex (dTex: decitex is 1 decitex and 2 gite 2 decitex) Even if the fibers are too thick, the number of fiber strands decreases at the same weight ratio, and it is difficult to achieve the effect of improving the vibration damping property. If the fibers are too thick, the carding property is different from other fibers. The length of the meta-aramid is suitably 40 to 70 mm, and the number of the crimp is preferably 3 to 6 / cm. In this case, if the fiber length is too short, the web formation is restricted. If the length is too long, It is difficult to obtain a degree of mixing. When the number of climbs is too small, there are restrictions on the formation of webs. If the number of climbs is too large, it may cause partial entanglement due to large frictional heat during needling.

When the fibrous raw material mixture as described above is determined, a needle punching nonwoven fabric should be prepared. In order to make the fibrous nonwoven fabric into a felt nonwoven fabric, the raw fiber is cut into about 50 to 100 mm, And then punched using a punching needle with protruding ears. The appropriate weight of the composite nonwoven fabric to be produced in the present invention is about 300 to 1,200 g / m ² , In this case, the thickness is 5 ~ 12mm, and it can be adjusted according to the application and the required performance. However, considering that the insulation is formed by heating and pressing to a thickness of 1.5 ~ 4.5mm, the thickness of the composite non- Of course, be set appropriately.

The needle punching nonwoven fabric thus made can be transferred directly to the heat pressing process for thickness processing, but if necessary, supplementary measures for the physical form can be additionally utilized to improve the effectiveness of the invention, using a hook needle The fiber orientation of the planes formed in the carding process may be oriented in the direction perpendicular to the thickness direction so as to exhibit better impact protection characteristics after the hot pressing process.

The needle punching nonwoven fabric manufactured as described above was made by melting a polypropylene fiber as a thermoplastic resin contained in a needle punching nonwoven fabric by using a heating apparatus at a temperature of 200 to 300 DEG C, placing a nonflammable aluminum thin film on the surface, The aluminum foil to be used is pure aluminum and preferably has a thickness of 5 to 300 mu m. The thickness of the aluminum foil is in the range of 5 to 300 mu m, If the thickness of the aluminum layer is less than 5 탆, it is difficult to sufficiently protect the flame or spark from the temperature of about 1,000 캜 at the time of the welding at the welding surface. If the thickness exceeds 300 탆, There is a concern.

If the heating temperature of the heating apparatus is less than 200 ° C, it takes a long time to melt the polypropylene resin in the composite nonwoven fabric and the heating time increases. When the heating temperature exceeds 300 ° C, There is a possibility that the physical properties of the heat insulating material are lowered. The lower temperature of the cooling roll can speed up the process speed. However, when the temperature of the cooling roll is less than 0 ° C, there is no problem in the characteristics of the heat insulating material, but an excessively low temperature is not necessary. , It takes a long time to solidify the molten polypropylene component, which is disadvantageous in that the process speed is lowered.

As described above, both surfaces of the needle punching nonwoven fabric are made of aluminum, which is excellent in incombustibility, and are pressed together while forming a thickness of 1.5 to 4.5 mm through hot pressing, thereby being able to maintain an excellent impact preventing property at a cryogenic temperature as well as a heat insulating property. It is possible to secure safety against fire caused by the fire, and to obtain a thin thickness necessary for the construction.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

[Example 1]

As shown in Table 1, E-glass fibers having a fiber thickness of 9.7 to 10.1 탆 were cut into a length of 50 to 70 mm, and 75% by weight of E-glass fibers having a melting point of 167 캜 and a length of 55 mm. Aramid fibers having a thickness of 2.2 dTex, a length of 51 mm, and a Cliffness of 4.5 yarns / cm 2 as a raw material as a raw material, a liquid antistatic agent Was treated at about 0.3 wt.% With respect to the raw fibers, and then a composite nonwoven fabric laminate before the needle punching of 1,000 g / m ² was produced through a series of openings, carding and cross lapping of the mixed fibers.

Using the needle punching composite nonwoven fabric thus prepared, an aluminum thin film having a thickness of 40 탆 was covered on the upper and lower sides, the polypropylene resin in the composite nonwoven fabric was melted through a heating roll having a temperature of 280 캜, , And various properties of the thus-prepared insulation were evaluated. The results are shown in Table 2. [Table 2] < EMI ID = 10.1 >

[Example 2] - [Example 10]

The heat insulating materials according to Examples 2 to 10 were modified as shown in [Table 1] below, and the composition of the composite nonwoven fabric and layer composition of Example 1 were changed as shown in [Table 2] ].

[Comparative Example 1] - [Comparative Example 10]

The heat insulating materials according to Comparative Examples 1 to 10 were modified as shown in Table 1 below and the compositions of the composite nonwoven fabric and the layers in Example 1 were subjected to the heat pressing step as shown in Table 2, ].

[Comparative Example 11] - [Comparative Example 12]

The heat insulating materials according to Comparative Example 11 and Comparative Example 12 were not made of the same composite nonwoven fabric as in Example 1, but in the case of Example 11, a polyethylene foam insulating material available in the market, and in Example 12, a polyurethane insulating sheet, The same heat insulation material as in Example 1 was used without heating and compression, and the results are shown in Table 2.

division Fiber mixing ratio (% by weight) Post-processing Weight
(g / m ² ) thickness
(mm) Organic matter Minerals AR Example 1 PP20 GF75 5 O 992 11.2 Example 2 PP30 GF60 10 O 976 12.0 Example 3 PP30 GF70 0 X 980 9.1 Example 4 PP20 GF75 5 X 1,012 8.9 Example 5 PP20 GF75 5 X 1,012 8.9 Example 6 PP20 GF75 5 X 1,012 8.9 Example 7 PP20 GF75 5 X 1,012 8.9 Example 8 PP20 GF75 5 O 687 8.1 Example 9 PP20 GF75 5 O 359 5.4 Example 10 PP20 S75 5 X 897 9.2 Comparative Example 1 PP50 GF45 5 X 950 10.4 Comparative Example 2 PP7 GF88 5 X 1,050 8.7 Comparative Example 3 PP20 GF60 20 X 970 9.1 Comparative Example 4 PP20 GF75 5 X 217 3.7 Comparative Example 5 PP20 GF75 5 X 1,582 15.7 Comparative Example 6 PP20 GF75 5 X 992 8.9 Comparative Example 7 PP20 GF75 5 X 992 8.9 Comparative Example 8 PP20 GF75 5 X 992 8.9 Comparative Example 9 PP20 GF75 5 X 992 8.9 Comparative Example 10 PP20 PET75 5 X 427 5.2 Comparative Example 11 - - - - - - Comparative Example 12 - - - - - -

PP: Polypropylene fiber (the following figures are% by weight)

GF: Glass fiber (the following figures are% by weight)

PET: Polyester staple fiber (the following figures are% by weight)

AR: meta-aramid fibers (the back numbers are% by weight)

Post-processing: A sample whose fiber orientation is increased in the thickness direction using a hook needle process

Weight: Cut the specimen to 200 * 200mm and measure its weight and convert it into g / m ²

Thickness: thickness of composite nonwoven fabric measured by dial gauge (mm)

division Aluminum Thin Film (㎛) Heat pressing condition Insulation properties heating
Temperature Cooling
Temperature Weight
(g / m ² ) thickness
(mm) nonflammable Low temperature
square Adiabatic Example 1 40 280 15 1,189 2.5 OK Undermine 0.035 Example 2 35 280 15 1,172 2.8 OK Undermine 0.036 Example 3 70 280 15 1,340 3.8 OK Undermine 0.035 Example 4 30 280 15 1,154 2.4 OK Undermine 0.037 Example 5 10 280 15 1,067 2.1 OK Undermine 0.035 Example 6 40 230 15 1,234 4.1 OK Undermine 0.034 Example 7 40 280 70 1,217 3.2 OK Undermine 0.035 Example 8 40 280 15 914 1.9 OK Undermine 0.037 Example 9 40 280 15 564 1.7 OK Undermine 0.039 Example 10 40 280 15 1,121 2.7 OK Undermine 0.035 Comparative Example 1 40 280 15 1,087 1.3 OK Destruction 0.047 Comparative Example 2 40 280 15 1,287 6.7 OK Undermine 0.034 Comparative Example 3 40 280 15 1,187 4.6 decomposition Undermine 0.035 Comparative Example 4 40 280 15 378 1.0 OK Destruction 0.052 Comparative Example 5 40 280 15 1,782 5.8 OK Undermine 0.037 Comparative Example 6 3 280 15 1,002 2.4 Combustion Undermine 0.036 Comparative Example 7 40 180 15 1,197 10.7 OK Undermine 0.036 Comparative Example 8 40 350 15 1,165 2.3 decomposition Undermine 0.035 Comparative Example 9 40 280 120 1,224 5.2 OK Undermine 0.035 Comparative Example 10 30 250 15 567 2.8 Combustion Undermine 0.048 Comparative Example 11 - - - 189 4.3 Combustion Destruction 0.045 Comparative Example 12 - - - 421 4.5 transform
decomposition Destruction 0.032

- Unit weight: Insulation molding specimen is cut to 200 * 200mm and the weight is measured and converted into g / m ²

- Thickness: Thickness (mm) measured by cutting insulation specimen to 200 * 200mm.

- Noncombustible: The torch flame using the general portable butane container was sprayed on the surface of the hot pressed test specimen for 10 seconds, and the change of the heat insulator was observed and evaluated.

OK: No change in shape without fire

Deformation: Fire does not stick, but appearance of product changes or distortion occurs

Disassembly: No fire, but combustible smoke

Burning: If it catches fire

- Low Temperature Dustproofing: Heat-pressed insulation is immersed in liquid nitrogen for 1 minute, taken out, placed on a slide glass for observation under a normal microscope with a thickness of 1.0 mm, and a steel ball having a weight of 100 g is dropped at a height of 30 cm to observe whether or not the slide glass is broken Respectively. In this case, when the flexibility is maintained at the cryogenic liquid nitrogen, the impact resistance can be exhibited and the slide glass can be prevented from breaking. If the flexibility is lost, the drop impact of the steel ball is transmitted to the slide glass to cause breakage. If the steel ball is dropped on the slide glass without any action, the slide glass will be destroyed even if the drop height is 5 cm.

- Thermal conductivity: Thermal conductivity measured in accordance with KS L 9016 (Unit: W / mK)

As shown in Table 2, the results of comparison between Examples 1 to 10 and Comparative Examples 1 to 12, which were tested with a non-combustible thermal insulating material having excellent impact resistance at a cryogenic temperature according to the present invention, (G / m ² ) and the thickness (mm) of the heat insulating material are comparatively smaller than those of the comparative example (except for Comparative Examples 11 and 12), the incombustibility, low temperature dustproofness, It was confirmed that the effect of improving the physical properties such as the uniformity was observed. It can be seen that Examples 1 to 10 are significantly better than Comparative Examples 11 and 12 which do not use the composite nonwoven fabric prepared in the present invention, in terms of incombustibility, low-temperature dustproofing property and heat insulation property.

Therefore, the non-flammable moisture-permeable and waterproof heat-reflecting and heat insulating material having excellent workability of the present invention can be variously substituted, modified and changed within the scope of the technical idea of the present invention, and can be used for various types of industrial facilities such as piping, It can be used as various environment-friendly functional materials which can be used as incombustible and adiabatic materials for airplanes, ships, automobiles, as well as facilities.

Claims (6)

A needle punching composite nonwoven fabric comprising 50 to 80% by weight of glass fiber, 10 to 40% by weight of polypropylene fiber and 0 to 10% by weight of meta-aramid fiber was prepared and then heated at a temperature of 200 to 300 ° C The polypropylene fibers contained in the needle punching composite nonwoven fabric were melted and the nonflammable aluminum foil was placed on both surfaces of the needle punching composite nonwoven fabric and then the aluminum foil was placed on both surfaces using a cooling roll having a temperature of 0 to 100 ° C The needle punching composite nonwoven fabric was pressed and formed into a thickness of 1.5 to 4.5 mm,
Wherein the fiber orientation direction in the composite nonwoven fabric is adjusted in the thickness direction through the hook needle after the needle punching composite nonwoven fabric is manufactured.
delete The method according to claim 1,
Wherein the glass fiber is one of A-glass, C-glass, E-glass, S-glass and silica fiber.
The method according to claim 1,
Wherein the aluminum thin film has a thickness of 5 to 300 占 퐉.
The method according to claim 1,
Wherein the needle punching composite nonwoven fabric has a thickness of 5 to 12 mm and a unit weight of 300 to 1,200 g / m ² , wherein the needle punching composite nonwoven fabric has excellent impact resistance at a cryogenic temperature.
A nonflammable thermal insulating material excellent in impact resistance at a cryogenic temperature, characterized by being molded by the manufacturing method according to any one of claims 1, 3, 4,