KR101162562B1 - Non-inflammably Highly Efficient Heat Insulator and Method for Preparing the Same - Google Patents

Abstract

The present invention relates to a non-combustible high-performance heat insulating material having a superior non-combustible performance and heat insulating performance compared to the conventional organic and inorganic heat insulating material, and more particularly, to amorphous silica powder, organic fiber alone or mixed of organic fibers and inorganic fibers. The fiber-reinforced fiber, radiation shielding additives and reinforcing materials were mixed dry and molded into a press to wrap the molded product with PE film or heat-shrink film on 6 sides to improve the strength and handleability of the insulation. In addition to improving the shortcomings of the non-combustible inorganic insulation (treatment of stinging, odors, etc.), the excellent insulation performance reduces the total thickness of the wall compared to the existing organic and inorganic insulation materials to ensure a wide interior space. , Resistant to moisture (moisture) when applying film with moisture resistance, and legal standard for construction (saving energy of buildings) Series basis) of omitting the process bangseupcheung incombustible high-performance insulation can reduce the sigongbi and to a method of manufacturing the same.
This non-combustible high-performance insulation is an insulation that can be effectively used not only in the interior and exterior walls of the building but also in refrigerated warehouses, LNG carriers and many other industrial fields with excellent insulation performance than conventional oil and inorganic insulation.

Description

Non-inflammable High Performance Insulator and Method for Preparing the Same {Non-inflammably Highly Efficient Heat Insulator and Method for Preparing the Same}

The present invention relates to a non-combustible high-performance heat insulating material for building materials and a method for manufacturing the same, more specifically, amorphous silica powder, organic fibers alone or mixed with organic fibers and inorganic fibers mixed with reinforcing fibers, radiation shielding additives and reinforcing materials dry After molding, the molded product was wrapped on a six-sided surface with a heat-shrink film selected from PE, LLDPE, PP, PVC, PET, etc. to improve the strength and handleability of the insulating material. Not only did it improve the disadvantages (handling, deterioration of handling, etc.), but also it has excellent heat insulating performance, which can reduce the total thickness of the wall compared to the existing organic and inorganic insulation materials to secure a wide indoor interior space. When the film is applied, it is resistant to moisture (hygroscopicity), and the construction cost is omitted by omitting the moisture barrier layer process, which is a legal standard (construction of energy saving design of building). It relates to a non-combustible high-performance insulation and a method of manufacturing the same that can be saved. This non-combustible high-performance insulation is an insulation that can be effectively used not only in the interior and exterior walls of the building but also in refrigerated warehouses, LNG carriers and many other industrial fields with better insulation performance than conventional oil and inorganic insulation.

Insulation performance standards of domestic insulation materials are classified into four grades (A, B, C, and D) according to the thermal conductivity performance according to the classification of insulation materials specified in Building Energy Saving Design Standard.

The non-combustible high performance heat insulating material of the present invention exhibits a high performance of 0.025 W / mK or less, which is superior to those of the highest grade 'ga' (heat conductivity value of 0.034 W / mK or less) grade whose thermal conductivity is classified above. It is a heat insulating material and is characterized by taking a very stable structure against fire as a non-combustible material.

Insulation material using silica powder has excellent thermal insulation performance and excellent incombustibility by minimizing heat transfer due to very small particles of silica and a large space between particles.

Silica powder has a very excellent thermal insulation performance, it is very difficult to have a board or a plate-like form due to the amorphous, very light powder form, even if the board form has a disadvantage that it is difficult to handle easily during transportation or processing.

The manufacturing method for the heat insulator disclosed in US Patent US03962014 refers to a method for forming and molding by inserting a heat insulating material such as silica powder into a package made of glass fiber. However, the above method has a disadvantage that the silica powder is counted from the glass fiber packaging, or the strength of the finished product is weak, so that handling and handling are very poor during transportation and work, and are very vulnerable to moisture (hygroscopicity). In addition, the application area is limited to the heater area and the like, the scope of application is limited.

The manufacturing method for the heat insulating molded product disclosed in International Patent WO2004 / 007394A1 refers to a method of producing a mixed molding using an inorganic binder, sodium silicate (aka water glass). However, according to the patent, a lot of drying time and process are required for manufacturing, and the density after drying is very high (600kg / m 3 or more), and the thermal conductivity is also relatively high, so that the function as a heat insulating material using silica powder is inferior. have.

The heat insulating material and its manufacturing method disclosed in Korean Patent Publication No. 10-2008-0076777 prevent the breakage during conveyance or processing of the heat insulating material, and adhere the nonwoven fabric or the like with an organic thickener to the press-molded silica powder compact to increase the adhesive strength of the coating material. It is mentioned how to prepare by drying. However, the manufacturing method according to the patent has a disadvantage that the non-woven fabric bonded to the heat insulating molded body may be damaged even if the silica molded body formed by the press is not peeled off. In addition, in order to prevent the molded body from being damaged by pressure molding at a high density (240 kg / m 3), there is a disadvantage in that the thermal conductivity is increased. In addition, the patent has a disadvantage that can not be applied to concrete walls and other moist places where water is very vulnerable to moisture.

Therefore, a heat insulating material using silica powder having excellent heat insulating performance and excellent incombustibility is required to develop a low density non-combustible high performance heat insulating material including not only excellent thermal conductivity but also low density, improved handling strength, and hygroscopic resistance.

The inventors of the present invention, as a result of research efforts to solve the various problems of the heat insulating material using the silica powder, PE film (Polyethylene), LLDPE (Linear Low-density polyethylene), etc. Using the heat-shrink film of the six-side wrapping (wrap 1-2 times) wrap the molded article (1 ~ 2 times) to improve the strength and hygroscopic resistance of the silica powder insulation material to complete the invention of the low-density non-combustible high-performance heat insulating material.

The present invention is based on the non-combustible performance of the main properties such as high-performance insulation, improved handling and hygroscopicity is improved, as well as excellent insulation performance than conventional oil and inorganic insulation, as well as freezing warehouse, LNG carrier and Its purpose is to provide a high performance insulation that can be effectively used in many other industries.

In order to achieve the above object, the present invention, 40 to 99% by weight of silica powder, 0.5 to 20% by weight of organic fiber alone or reinforcing fiber mixed with organic fibers and inorganic fibers, radiation shielding additives and 0 to 50% by weight of the reinforcing material After dry mixing and press-molding, it provides a non-flammable high-performance heat insulating material characterized in that the six-side wrapping (wrapping) (1-2 times) with a shrink film such as PE film or LLDPE film.

The present invention also comprises the steps of: a) 40 to 99% by weight of silica powder, 0.5 to 20% by weight of reinforcing fibers, 0 to 50% by weight of radiant heat shielding additives and reinforcing materials in a dry or undried dry mixer; b) the reinforcing fibers are mixed with the organic fibers alone or dry mixed with organic fibers and inorganic fibers; c) press molding the mixed raw material by mold press molding or roller press molding; d) wrapping the press-formed product once or twice; And e) PE film packaging in step d) is to wrap the press-molded product with a PE film and the heat-sealing peeling finish, wrapping with a shrink film such as LLDPE and shrink wrapping using a shrink wrap machine; including It provides a method for producing a non-combustible high performance insulation.

This non-combustible high-performance insulation is an insulation that can be effectively used not only in the interior and exterior walls of the building but also in refrigerated warehouses, LNG carriers and many other industrial fields with excellent insulation performance than conventional oil and inorganic insulation.

 The present invention is a silica heat insulating material containing amorphous silica, reinforcing fibers, radiation heat shielding additives and reinforcing materials at a consistent point, silica powder 40 ~ 99% by weight, organic fibers alone or mixed fibers of organic fibers and inorganic fibers 0.5 ~ 20% by weight, radiant heat shield additive and 0-50% by weight of reinforcement materials are mixed dry, and after press molding, 6-side wrapping wrap (1 ~ 2 times) with shrink film such as PE film or LLDPE It relates to a non-combustible high performance insulation.

The present invention will be described in detail as follows.

The present invention, in the conventional silica heat insulating material using the silica powder, using an inorganic binder that has been generally applied, and instead of press molding at a high density, molded at a low density without a binder to wrap six-side wrapping with a shrink film such as PE film or LLDPE By providing excellent physical properties such as strength, hygroscopicity and light weight, and to provide a non-flammable high-performance insulation material that can be effectively used not only in the building interior / exterior walls, but also in refrigerated warehouses, LNG carriers and many other industrial fields.

The silica powder used in the present invention is an amorphous, very light powder with very small basic particles, a spherical shape, a large surface area, a characteristic surface characteristic, and a high purity silicon compound. The average diameter of the spherical basic particles is 5 to 50 nm. It has a size and has a large surface area due to the small particles, the value of which is in the form of a powder ranging from 40 to 400 m 2 / g.

Silica powder is used 40 to 99% by weight in the total composition of the silica insulation. If the amount is less than 40% by weight, the thermal conductivity value measured according to the thermal conductivity measurement method of KS L 9016 thermal insulation material becomes 0.026W / mK or more, so that the thermal insulation performance is deteriorated. There is a problem in moldability that the shape of the edge portion of the molded body is lowered.

The following effects can be obtained by appropriately adding the silica powder as described above.

The silica powder used in the present invention has a very small particle size and a large space between particles, thereby minimizing heat transfer by gas, and the size of heat transfer by silica itself is very small as amorphous silica. In other words, in general porous fibrous insulation materials, heat transfer may occur due to collision of gas molecules, but insulators using silica powder are dispersed in spaces between fine particles, so that gas molecules in fine pores have an average free stroke (the first collision of particles and the second Since the collision does not occur in the air due to the average distance between collisions, it has an advantageous structure for heat insulation and heat shielding, and thus it is possible to produce an excellent heat insulation performance.

As the reinforcing fiber used in the present invention, an organic fiber alone or a mixed fiber of an organic fiber and an inorganic fiber is used, and a fiber having a diameter of 1 to 100 μm and a length of 6 to 40 mm is used, and the inorganic fiber uses a ceracic fiber, Organic synthetic fibers use fibers such as PAN, PVA, PP, and the like.

Reinforcing fibers use from 0.5 to 20% by weight. If the amount is less than 0.5% by weight, there is a problem in that the strength expression effect and formability by the reinforcing fiber is lowered, and when it exceeds 20% by weight, the thermal conductivity value measured based on the method of measuring the thermal conductivity of the KS L 9016 thermal insulation material is relatively high. Since this becomes 0.026 W / mK or more, there exists a problem that heat insulation performance falls. In addition, when the fiber length of less than 6 mm is used, the reinforcing effect of the fiber is inferior, and when the fiber length of 40 mm or more is used, the fiber is difficult to disperse during dry mixing with silica powder, and the agglomeration of the fiber itself occurs. A problem arises in that moldability deteriorates.

The reinforcing fibers are evenly dispersed to form an integrated bond with the silica powder aggregate to exhibit the primary formability and strength enhancing effect of the present heat insulating material, and inorganic fibers and organic synthetic fibers may be used alone or in combination.

Radiation shielding additives and reinforcing materials used in the present invention is an opaque agent, the opaque agent has the advantage of blocking the radiant heat by scattering the radiant heat. Radiant heat shield additives and reinforcing materials use talc, silicon carbide, iron oxide, zirconium oxide, graphite and the like, and 0 to 50% by weight of the total composition of the insulation. When the heat insulator is used at room temperature, it is not necessary to add the radiation shielding additive, but the amount of the heat insulator does not exceed 50% by weight when heat insulation is required, especially when radiant heat is required. When it exceeds 50% by weight, the thermal conductivity value measured based on the thermal conductivity measurement method of KS L 9016 thermal insulation material becomes 0.026W / mK or more, and thus there is a problem that thermal insulation performance is deteriorated. In addition, talc, silicon carbide, iron oxide, zirconium oxide, graphite, and the like also give a function as a reinforcing material that the heat insulating material can have a certain strength as a building material.

In the six-side wrapping packaging used in the present invention, PE film or a heat-shrink film selected from LLDPE, PE, PP, PVC, PET is used, and in the heat insulating material requiring moisture resistance, the moisture permeability of the film is 30 g / 24 hours A film having a moisture permeability of not more than 2 m 2 or of not more than 0.28 g / m 2 · h · mmHg is used. Wrapping is carried out once or twice. PE film packaging wraps the silica insulation molded body with PE film and seals it with heat adhesion. Shrink film packaging such as LLDPE wraps the silica insulation molded body with the shrink film such as LLDPE and shrink wraps using a shrink wrap machine.

Six-side wrapping wrapped with heat-shrink film selected from PE, LLDPE, PP, PVC, PET to improve the physical properties such as bending strength, hygroscopicity, light weight. In addition, when using a moisture-permeable film, it satisfies the 'Energy-saving Design Standards for Buildings' moisture-proof floor standard and omits the process of installing a moisture-proof film when installing insulation on the inner wall of a building, thereby reducing the construction period and reducing labor costs when applying the construction site. Can be imported.

Hereinafter, the present invention will be specifically described based on Examples and Comparative Examples, but the present invention is not limited to Examples or Comparative Examples.

Examples 1-5 and Comparative Examples 1-5

Next, the silica insulating material was manufactured by dry mixing the ingredients and contents as shown in Table 1 and Table 2, and the manufacturing method was based on the method described in the detailed description of the present invention.

[Measurement of properties]

The physical properties of the silica insulation prepared according to Examples 1 to 5 and Comparative Examples 1 to 5 were measured by the following methods, and the results are shown in Tables 1 and 2, respectively.

 <Measurement method>

1.density

The density was measured based on KS M 3808 and calculated by the following equation.

2. Flexural Strength (Bending Strength)

Flexural strength was measured based on KS M 3808 and calculated by the following equation.

The specimens shall use specimens wrapped in six sides.

W: Maximum load (N)

ℓ: Distance between points (cm)

b: test piece butterfly (cm)

h: test piece thickness (cm)

 3. Hygroscopicity

 Hygroscopicity test was measured according to ASTM C 1104, it was calculated through the following equation.

As the test piece, a six-side wrapped packaged test piece having moisture resistance was used.

4. Thermal conductivity

Thermal conductivity test was measured according to KS L 9016.

5. Formability

The moldability was judged by the visual inspection of the silica thermal insulation plate to determine the molding state of the finished product by determining the defects such as the surface state.

6. Dimension

Dimensions of thickness, length, butterfly, and the like were measured according to KS M 3808.

7. Flame retardant performance

Flame retardant performance was measured in accordance with KS F ISO 1182 (non-flammability test method of building materials) and KS F 2271 (gas hazard test) according to the flame retardant performance standard of building interior finishing materials (Notice No. 2006-476 of Ministry of Construction and Transportation). .

division Example 1 Example 2 Example 3 Example 4 Example 5 Ingredient
(weight%) Silica powder 92 65 80 48 98 Inorganic fiber 8 5 - 17 - Organic Synthetic Fiber - 11 8 - 2 Radiant heat shield additive 0 19 12 35 0 system 100 100 100 100 100 Packing PE film packing - - 1 time 1 time - Shrink Film Packaging 1 time Episode 2 - - Episode 2 Properties Density (㎏ / ㎥) 200 202 203 205 195 Flexural strength (N / ㎠) 20 23 20 20 22 Hygroscopicity (V%) 0.8 0.6 0.8 0.8 0.6 Thermal Conductivity (W / mK) 0.021 0.023 0.022 0.024 0.021 Formability Good Good Good Good Good Flame retardant performance Nonflammable Material Nonflammable Material Nonflammable Material Nonflammable Material Nonflammable Material

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Ingredient
(weight%) Silica powder 36 99.5 45 88 70 Inorganic fiber 6 0.3 - 12 14 Organic Synthetic Fiber 10 - 0.1 - 12 Radiant heat shield additive 48 0.2 54.9 0 4 system 100 100 100 100 100 Packing PE film packing 1 time - - - - Shrink Film Packaging - Episode 2 1 time - Episode 2 Properties Density (㎏ / ㎥) 216 195 214 198 202 Flexural strength (N / ㎠) 22 17 13 8 23 Hygroscopicity (V%) 0.8 0.6 0.8 3.7 0.6 Thermal Conductivity (W / mK) 0.027 0.021 0.026 0.021 0.026 Formability Good Bad usually Good Good Flame retardant performance Nonflammable Material Nonflammable Material Nonflammable Material Nonflammable Material Nonflammable Material

 &Lt; Examples and Comparative Examples &

As shown in Table 1 and Table 2, the silica heat insulating material was prepared in the form of a combination of varying the content of the composition, the method and the number of packaging.

As described above, when the content of the silica powder is increased, the thermal conductivity of the manufactured silica insulation material is lowered, and the thermal insulation performance is improved. As the content of the radiation shielding additive and the fiber is increased, the thermal conductivity value is increased and the thermal insulation performance is lowered. Indicates.

Silica heat insulating materials prepared by Examples 1 to 5 all exhibited high performance heat insulating performance of 0.025W / mK or less, and the density was maintained within 200 kg / m 3.

In the case of the film packaging, as shown in the examples, the bending strength of the two-packing compared to the first-packing resulted in a result of about 10% or more improvement, and the moisture absorption rate also showed a result of about 20% improvement. However, in the case of film packaging, even when packaging once, it exhibits excellent moisture absorption and heat insulating performance compared to the existing inorganic insulating material.

When the content of the silica powder was used at 40% or less as in Comparative Example 1, the thermal conductivity value was increased, resulting in a decrease in thermal insulation performance. In order to obtain a low thermal conductivity value in a high-performance heat insulating material, it is necessary to add a certain amount of silica powder, and also when the content of the radiation shielding additive (opaque agent) and the reinforcing fiber exceeds the scope of the present invention (Comparative Example 3, Comparative Example) 5) It can be seen that the thermal insulation performance is lowered.

When the content of the silica powder in the present invention exceeds 99% by weight, as shown in Comparative Example 2, the thermal conductivity value is very good, but the molding quality of the insulation product is not satisfied, and as shown in Comparative Example 3, the content of the radiation shielding additive Even when the range of the present invention was exceeded, the molding quality was somewhat reduced.

As shown in Comparative Example 2, Comparative Example 3, and Comparative Example 4, it was confirmed that the film packaging occupies a considerable part in the flexural strength expression rather than the reinforcing effect by the reinforcing fiber content. Of course, it was found that the flexural strength, that is, the handling strength, appeared due to the proper content of the film packaging and the reinforcing fiber.

As shown in Comparative Example 4, when the six-side film packaging is not applied to the silica heat insulating material, there is a problem in that the bending strength is lowered, and the moisture absorption rate is about 6 times higher than that of the heat insulating material packed twice as a film. The quality may be deteriorated and may be a cause of an increase in construction cost because additional moisture proof layer construction must be additionally carried out in the insulation construction.

Flame retardant performance was expressed as non-combustible material performance as shown in the previous section of the Examples and Comparative Examples.

Therefore, in order to make a plate insulation material that has excellent heat insulation performance and non-combustible performance, but is difficult to be molded by dry molding or plate-shaped and handled in various industries, silica powder is 40 to 99% by weight, organic fiber Shrink film selected from PE, PP, PVC, PET, containing 0.5 ~ 20% by weight of reinforcing fiber made of mixed fiber of organic or inorganic fiber and 0 ~ 50% by weight of radiant heat blocking additive (opaque agent). It is possible to secure the quality of non-combustible high-performance insulation materials such as high-performance insulation performance, improved handling strength, and excellent performance as non-combustible materials by improving the formability and low thermal conductivity by applying 6-side wrapping wrap (1 ~ 2 times). I could confirm it.

As described above in detail the specific parts of the present invention, for those skilled in the art, these specific descriptions are only preferred embodiments, which are not intended to limit the scope of the present invention. Will be obvious. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

Claims (6)

Heat shrink film after dry mixing and press molding 40 ~ 99% by weight of silica powder, 0.5 ~ 20% by weight of reinforcing fiber made of organic fiber alone or mixed fiber of organic fiber and inorganic fiber, 0 ~ 50% by weight of radiant heat blocking additive and reinforcing material Non-flammable, high-performance insulation material characterized in that the wrapper (wrapping) 6 times (1 ~ 2 times), the thermal conductivity value is less than 0.025W / mK.
According to claim 1, wherein the silica powder is a spherical amorphous high-purity silicon compound, non-flammable, high performance, characterized in that the spherical basic particles of the powder form of 5 ~ 50 nm, specific surface area 40 ~ 400 m 2 / g insulator.
The fiber according to claim 1, wherein the reinforcing fiber is an organic fiber alone or a mixed fiber of an organic fiber and an inorganic fiber, and is a fiber having a diameter of 1 to 100 µm and a length of 6 to 40 mm, and includes glass fiber, ceramic fiber, PAN, Nylon, PVA, Non-flammable, high performance insulation material, characterized in that the fiber selected from PP.
The non-combustible high performance insulator according to claim 1, wherein the radiation shielding additive and the reinforcing agent are selected from talc, silicon carbide, iron oxide, zirconium oxide, and graphite as an opaque agent.
According to claim 1, wherein the six-side wrapping (Wrapping) packaging using a heat-shrink film selected from PE, LLDPE, PP, PVC, PET, moisture permeability 30 g / ㎡ or less per 24 hours or water vapor transmission coefficient of 0.28 g / ㎡ A non-flammable, high performance insulating material characterized by using a film having a moisture resistance of? h? mmHg or less.
In the method of manufacturing a non-combustible high performance insulation,
(a) introducing all the raw materials of claim 1 to a dry mixer in a dry or undry state;
(b) reinforcing fibers by mixing organic fibers alone or by adding organic fibers and inorganic fibers together;
(c) press molding the mixed raw material by mold press molding or roller press molding;
(d) wrapping the press-molded product once or twice;
(e) wrapping with a heat shrink film selected from PE, LLDPE, PP, PVC, PET in step (d) and shrink wrapping using a shrink wrap machine; Or wrapping the press-formed product with a PE film and sealing finishing by heat bonding.