KR101658610B1 - The composition for insulation - Google Patents

Abstract

The present invention relates to a heat insulating composition, and more particularly, to a heat insulating composition which comprises silicate, calcium carbonate, magnesium oxide and aragonite, Heat resistance, heat resistance, and little change due to light or other chemical substances.

Description

{The composition for insulation}

The present invention relates to a heat insulating composition, and more particularly, to a heat insulating composition which comprises silicate, calcium carbonate, magnesium oxide and aragonite, Heat resistance, heat resistance, and little change due to light or other chemical substances.

Insulation material is a material to cover the outside of the part to be kept at a constant temperature and to reduce the heat loss or the inflow of heat to the outside. It is divided into the insulation material of 500 ℃ to 100 ℃, the insulation material of 500 ℃ to 1,100 ℃ and the refractory insulation material of 1,100 ℃ or higher. It is made porous so as to reduce the thermal conductivity.

The heat insulating material is preferably a material having a small thermal conductivity, but most of the thermal conductivity is not so small that the material is made porous and the heat insulating property of air in the pores is utilized.

Insulation materials can be classified into organic materials and inorganic materials.

As the organic material, carbonized cork, cellulose, polyester, aramid, polypropylene, polyamide, foamed styrene, foamed polyurethane, foamed urea, foamed polyethylene, foamed rubber and the like are used. , Ceramic fiber, glass wool, mineral wool, and the like are used.

This can be seen from the existing literature as follows.

Insulating materials including organic materials are disclosed in Japanese Patent No. 4,308,877 and Korean Patent No. 1,223,785. Japanese Patent No. 4,308,877 discloses a heat insulating material comprising cellulose fiber, a natural adhesive agent and shell calcium, which is produced by spraying water with the above material placed in a space of an architectural structural member, and an adhesive is adhered to the cellulosic fiber and solidified It is difficult to separate the cellulose fiber and the adhesive from each other, so that it is difficult to reuse the cellulose fiber, and there are problems such as generation of harmful substances in the case of fire or incineration. In addition, Korean Patent No. 1,223,785 discloses an invention relating to a double-layered heat insulating structure including a flame retardant panel and a rigid polyurethane foam, which requires a cost for a site construction facility, which is expensive and a toxic gas is generated in a fire .

Insulation materials including inorganic materials are disclosed in European Patent No. 2,290,164 and Japanese Patent No. 3,376,742. European Patent No. 2,290,164 is an invention relating to a heat insulating material including mineral wool and a binder. In order to improve the flame retardant performance of a heat insulating material, the amount of mineral wool should be increased and the density should be increased. When the density of mineral wool is increased, There is a difficulty in production efficiency such that erosion may occur when the product is transported in the workplace. In addition, Japanese Patent No. 3,376,742 discloses an insulating material containing inorganic fibers, inorganic fillers of mineral powders, and hydrocarbon solvents. Among the inorganic fibers, rock wool and glass fibers stimulate the skin of the human body, , It does not completely decompose at a high temperature, so that it does not completely remove the stress that causes volume change by acting on the covering material in the case of fire.

Most commonly used insulation materials include calcium silicate heat insulator, heat insulation ceramics, and Aerogel insulation.

Calcium silicate insulation is mainly composed of tobermolite (5CaO · 6SiO ₂ · 5H ₂ O) or zonentrite (6CaO · 6SiO ₂ · H ₂ O) produced by hydrothermal reaction of quartzite, silica, silica and diatomaceous earth with lime It is a molded body composed of calcium silicate hydrate and asbestos. Because it is light and has excellent heat insulation, it is used for building materials and so on. Ceramic insulation is a ceramics used to prevent the conduction of heat and has a high heat resistance property and is not easily deformed. Typically, it is made of diatomaceous earth, pearlite, etc., or a bubble glass heated by mixing a blowing agent with a glass powder. Ceramics is a solid material that has been heat treated at a high temperature after molding inorganic nonmetal raw materials. Among these ceramics, a common feature of ceramics used as an insulating material is that it has an effect of insulation because a very small number of holes are drilled to prevent heat transfer due to bubbles. Typical ceramic thermal insulation materials include diatomaceous earth and pearlite, which are natural raw materials, and bubble glass, which is heated by mixing a blowing agent with glass powder. Compared to previously used corks and foamed polystyrenes, they have higher heat resistance and are not easily deformed.

However, calcium silicate insulation and ceramic insulation have limitations in heat insulation, making it difficult to apply them to places or objects requiring high thermal insulation effects.

Aeroglue insulation is light and has good thermal insulation and is used in Mars Robot (Sozerner) and so on, but it is expensive.

Japanese Patent No. 4,308,877 (May 15, 2009) Korean Patent No. 1,223,785 (2013.01.11) European Patent No. 2,290,164 (Apr. 25, 2012) Japanese Patent No. 3,376,742 (December 2002)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a heat insulating composition which is harmless to human body and low in price, It is an object of the present invention to provide an adiabatic composition which does not generate toxic gas including Aragonite and has a high fire resistance and heat insulation property.

Another object of the present invention is to provide a thermal insulation composition which is easy to apply and easily applicable to various product groups.

According to a preferred embodiment of the present invention, the heat insulating composition comprises 10 to 100 parts by weight of calcium carbonate, 5 to 50 parts by weight of magnesium oxide, 1 to 30 parts by weight of aragonite, and 0.01 to 10 parts by weight of an inorganic binder, And the like.

Further, the heat insulating composition of the present invention is characterized by further comprising dolomite, cristobalite or a mixture thereof.

Further, the heat insulating composition of the present invention is characterized by further comprising zirconium oxide.

In the heat insulating composition of the present invention, the inorganic binder is selected from among potassium silicate, lithium silicate, alumina silicate, calcium silicate, sodium silicate, calcium sulfate, silica sol, alumina sol, magnesium phosphate, cement, gypsum, clay and clay One or two or more of them.

INDUSTRIAL APPLICABILITY The heat insulating composition of the present invention does not generate a toxic gas upon combustion and has a high fire resistance and heat insulating property.

Silical, calcium carbonate, magnesium oxide and aragonite, which are the heat insulating compositions of the present invention, do not have a risk of deterioration as a stable mixed composition.

In addition, it can be used for building insulation for apartments, apartment houses, buildings, factories, etc., industrial insulation materials such as refrigerators, freezers, freezing warehouses, refrigerators, industrial sites, insulation materials for ships such as LNG and LPG, It can be easily applied to various fields such as supplies.

Hereinafter, the present invention will be described in detail with reference to examples of the present invention. It will be apparent to those skilled in the art that these embodiments are merely illustrative of the present invention in order to more particularly illustrate the present invention and that the scope of the present invention is not limited by these embodiments .

The heat insulating composition of the present invention includes inorganic materials such as Silimate, Calcium carbonate, Magnesium oxide, Aragonite and an inorganic binder.

The silica, silicate, calcium carbonate, magnesium oxide and aragonite may be mixed and agitated in powder form. If the diameter of each inorganic material is 2,000 mesh or more, It is preferably 2,000 mesh or less.

The chemical formula of Silimate contained in the heat insulating composition of the present invention is Al ₂ SiO ₅ , which is homogeneous (homogeneous image) with Hwangjusu or Namyeongseok, is stable at higher temperature and higher pressure than Hwangyu stone, The heat insulating performance can be improved by fixing carbon dioxide in the heat insulating composition of the present invention.

The sillicite has a hardness of 6.5 to 7 and a specific gravity of about 3.2 and may be colorless or white to gray.

The formula of the calcium carbonate contained in the heat insulating composition of the present invention may be CaCO ₃ with a specific gravity of about 2.93.

The calcium carbonate can be carbon dioxide generated and adhered to the heat insulating composition of the present invention, so as to lower the thermal conductivity.

Examples of the method for generating carbon dioxide include, but are not limited to, a heating method (see Chemical Formula 1) and a method for allowing an acid to act (see Chemical Formula 2).

Formula 1

CaCO ₃ → CaO + CO ₂ ↑

(2)

CaCO ₃ + 2HCl → CaCl ₂ + H ₂ O + CO ₂ ↑

If the amount of the calcium carbonate is less than 10 parts by weight, the adhesion of the calcium carbonate to an object such as facilities having a high temperature on the outer surface is insufficient. When the amount of the calcium carbonate exceeds 100 parts by weight, the density becomes extremely high, . Accordingly, the calcium carbonate may be contained in an amount of preferably 10 to 100 parts by weight, more preferably 30 to 70 parts by weight, and most preferably 40 to 60 parts by weight based on 100 parts by weight of the silicate.

The magnesium oxide contained in the heat insulating composition of the present invention may be MgO having a specific gravity of 3.2 to 3.7, a high temperature type of 800 ° C or less and a low temperature type of 400 ° C or less, 2800 占 폚, the heat-resistant temperature is high and the heat-resistance can be excellent.

The magnesium oxide may be produced by calcination of magnesium carbonate or magnesium hydroxide and a method of producing magnesium chloride by lime and heat treatment. However, the present invention is not limited thereto.

The magnesium oxide may be contained in an amount of preferably 5 to 50 parts by weight, more preferably 20 to 40 parts by weight, based on 100 parts by weight of the silicate of the present invention as a filler.

The Aragonite formula contained in the heat insulating composition of the present invention is CaCO ₃ , a mineral belonging to the orthorhombic system having a crystal structure such as olivine, having a hardness of 3.5 to 4 and a specific gravity of about 2.9.

In addition, it plays a role of generating carbon dioxide like calcium carbonate, and it can also serve to fix carbon dioxide like sill.

The aragonite may be contained in an amount of preferably 1 to 30 parts by weight, more preferably 5 to 20 parts by weight, based on 100 parts by weight of the silicate of the present invention.

The inorganic binder of the present invention may contain 0.01 to 10 parts by weight, more preferably 0.1 to 5 parts by weight, based on 100 parts by weight of silicate.

The inorganic binder is not particularly limited but may be selected from the group consisting of potassium silicate, lithium silicate, alumina silicate, calcium silicate, sodium silicate, calcium sulfate, silica sol, alumina sol, magnesium phosphate, cement, gypsum, clay, It is preferable to include two or more species.

The heat insulating composition of the present invention may further comprise dolomite, cristobalite or a mixture thereof.

The chemical composition of the dolomite is 1: 1 of calcium carbonate and magnesium carbonate, and CaCO ₃ .MgCO ₃ is a refractory raw material.

The cristobalite is one of quartz, composed of silica or silicon dioxide, and the formula is a mineral mainly composed of SiO ₂ . (Quartz) at a temperature of 573 DEG C or higher, trimerite at a temperature of 870 DEG C or higher, and cristobalite at a temperature of 1470 DEG C or higher at a temperature of 573 DEG C or lower And the cristobalite can fix carbon dioxide to improve the heat insulating property.

The dolomite and cristobalite may be contained in an amount of preferably 1 to 20 parts by weight, more preferably 5 to 15 parts by weight, based on 100 parts by weight of the sillimeter.

The heat insulating composition of the present invention may further include zirconium oxide.

The zirconium oxide is a material for improving the stability of the heat insulating composition of the present invention in the mixed powder form, and may be contained in an amount of preferably 0.5 to 10 parts by weight, more preferably 1 to 5 parts by weight May be included.

The heat insulating composition of the present invention is useful as a heat insulation material for buildings such as apartment buildings, apartment buildings, buildings, factories, refrigerators, freezers, refrigerator warehouses, refrigerators, industrial sites, insulation materials for ships such as LNG and LPG, It can be easily applied to various fields such as sports goods such as sports goods.

Hereinafter, the present invention will be described in more detail by way of examples. However, these embodiments are for illustrative purposes only and the invention is not limited thereto.

Example 1

1. Mixing of inorganic materials

100 parts by weight of sillicite having an average particle size of about 1,000 mesh each of inorganic materials, 50 parts by weight of calcium carbonate, 30 parts by weight of magnesium oxide and 10 parts by weight of aragonite were mixed together.

2. Preparation of inorganic binders

0.4 parts by weight of an inorganic binder obtained by mixing a lithium silicate solution and a liquid potassium silicate at a volume ratio of 1: 1 was added to the inorganic material to obtain a mixture.

Then, the mixture was stirred in a stirrer at 3,000 rpm for 10 minutes to be reacted, and pressed to produce a heat insulating material (300 x 300 x 10 mm).

Example 2

In the same manner as in Example 1, 10 parts by weight of dolomite and 10 parts by weight of cristobalite were further added to prepare a heat insulating material in "1. Mixing of inorganic materials".

Example 3

In the same manner as in Example 2, except that 2 parts by weight of zirconium oxide was further contained in "1. Mixing of Inorganic Materials" to produce a heat insulating material.

The contents of the compositions prepared according to Examples 1, 2 and 3 are summarized in Table 1 below.

Example 1 Example 2 Example 3 Sill 100 100 100 Calcium carbonate 50 50 50 Magnesium oxide 30 30 30 Aragonite 10 10 10 Dolomite - 10 10 Cristobalite - 10 10 Zirconium oxide - - 2 Inorganic binder 0.4 0.4 0.4

≪ Measurement of physical properties &

The physical properties of the heat insulator prepared according to Examples 1, 2 and 3 were measured by the following methods, and the results are shown in Table 2 below.

1. Thermal conductivity

The thermal conductivity was measured at 20 ± 5 ° C according to KS L 9016.

2. Density

The density was measured according to KS M 3808 and calculated using the following formula 1.

[Formula 1]

Density (kg / m ³ ) = W (dry weight) / V (volume)

3. Moisture permeability coefficient

The moisture permeability coefficient was calculated by the moisture permeability coefficient per 25 mm thickness.

4. Flexural strength (flexural strength)

The flexural strength was measured in accordance with KS M 3808 and calculated using the following formula.

[Formula 2]

Bending strength (N / cm ² ) = 3Wl / 2bh ²

W: Maximum load (N)

l: Distance between points (cm)

b: Specimen thickness (cm)

5. Compressive strength

The compressive strength was measured according to KS F 2405.

6. Combustion measurement temperature

The combustion measurement temperature is a temperature measured at about 1,200 ° C.

division Example 1 Example 2 Example 3 Thermal conductivity (W / mK) 0.024 to 0.026 0.023 to 0.025 0.023 to 0.026 Density (Kg / m ³ ) 146 147 149 Moisture permeability coefficient (ng / m ² sPa) 35 36 35 Flexural Strength (N / cm ² ) 47 48 49 Compressive strength (N / cm ² ) 42 43 45 Combustion nonflammable nonflammable nonflammable Emission of harmful gas during combustion All (none) All (none) All (none)

As shown in Table 2, the heat insulating composition of the present invention has a low thermal conductivity and a high fire resistance of 0.025 w / m · K or less, and has excellent heat insulation and fire resistance that do not generate toxic gases due to incombustibility upon combustion.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. . Accordingly, the true scope of the present invention is to be determined by the following claims.

Claims (4)

With respect to 100 parts by weight of sillimanite,
30 to 70 parts by weight of calcium carbonate, 20 to 40 parts by weight of magnesium oxide, 5 to 20 parts by weight of aragonite, 5 to 20 parts by weight of dolomite, 5 to 20 parts by weight of cristobalite, 1 to 5 parts by weight of zirconium oxide, And 10 parts by weight of the composition.
delete delete The method according to claim 1,
Wherein the inorganic binder includes one or more selected from among potassium silicate, lithium silicate, alumina silicate, calcium silicate, sodium silicate, calcium sulfate, silica sol, alumina sol, magnesium phosphate, cement, gypsum, clay and clay Wherein the thermoplastic resin is a thermoplastic resin.