KR20190035979A - Manufacturing method of inorganic heat insulating board using magnesium sulfate inorganic binder and Inorganic heat insulating board manufactured by this - Google Patents

Abstract

The present invention can provide a method for manufacturing an inorganic heat insulating board using magnesium sulfate inorganic binder, which comprises: (a) a step of stirring to manufacture a mixture by adding magnesium sulfate to water and heating; (b) a mixing step for manufacturing an inorganic binder by adding a silicate solution to the mixture manufactured; (c) a primary molding step in which magnesium oxide is added to the inorganic binder and kneaded; (d) a secondary molding step for enhancing heat insulating performance by mixing pearlite with the inorganic heat insulating material manufactured by the primary molding; and (e) a drying step in which the inorganic heat insulating material manufactured by the secondary molding is put into a mold, pressurized and dried at room temperature. Further, the inorganic heat insulating board manufactured by the manufacturing method can be provided. It is possible to improve durability and realize thermal properties compared with conventional inorganic binders.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for manufacturing an inorganic heat insulating board using magnesium sulfate inorganic binder, and an inorganic heat insulating board using the inorganic insulating board,

The present invention relates to a method of manufacturing an inorganic heat insulating board using a magnesium sulfate inorganic binder and an inorganic heat insulating board manufactured thereby. More specifically, by manufacturing an inorganic binder with magnesium sulfate, it is possible to improve durability as compared with existing inorganic binders, The present invention relates to a method for manufacturing an inorganic insulating board using a magnesium sulfate inorganic binder that enables the implementation of the characteristics of the inorganic insulating board.

In general, in order to improve the standard of living, to upgrade the knowledge industry, and to respond to the rapidly changing environment of the information society, it is necessary to enlarge, modernize and functionalize buildings according to the absolute need of the residential space. And it is an inevitable reality.

Therefore, research and efforts have been continued to develop materials that satisfy both lightweight, fireproof, soundproofing, and insulation and insulation of building materials. In response to this demand, porous construction materials are being developed in various fields .

Although the building materials developed so far have been applied to styrofoam, urethane, asbestos, gypsum board or the like, the above-mentioned building materials have problems in that they are not all lightweight, incombustible, soundproof, and heat insulation.

First, the Urethane products made of the styrofoam and urethane have excellent warm-keeping ability to protect the outside cold air and the inner heat to the outside due to the air inside, while the hot air in the summer is cut off, There is a problem in that the room is cooled by the temperature difference inside. However, there is a problem with relatively low heat. In case of fire, toxic gas is spouted and the damage is very high. Urethane foam also has lower ignition rate than styrofoam. There is a problem of being discharged, and the weight is heavy.

The gypsum board used for indoor walls, partitions, ceilings, etc., is also excellent in heat resistance and durability. It is a plate-like integral interior material sandwiched between two sheets of paper (or other fiber materials) It is a kind.

However, since the gypsum board is heavy in weight and is not excellent in stretchability and strength, it is sharply reduced in use due to problems such as being crumbled, and the use of inorganic board using expanded vermiculite, expanded perlite and inorganic binder is rapidly increasing to be.

However, all of the conventional inorganic boards use liquid sodium silicate (water glass) as the main component of the inorganic binder and various reinforcing materials are used here. The liquid sodium silicate (water glass) has good initial adhesion but is very vulnerable to moisture, The water reacts with moisture in the air or water to produce sodium hydroxide, which is changed to hydrophilic, and the strength is rapidly weakened by moisture.

In order to compensate for this, sodium silicate (water glass) is required to form a stable salt by reacting with sulfuric acid, nitric acid or phosphoric acid, so that the use of liquid sodium silicate (water glass) It is necessary to use various reinforcing materials for adhesion or strength reinforcement, so that the manufacturing process of the inorganic binder is difficult and the manufacturing cost is increased.

In order to solve the above problems, the present invention provides a method for manufacturing an inorganic heat insulating board using magnesium sulfate inorganic binder which improves durability and realizes high thermal properties compared to existing inorganic binders by producing an inorganic binder with magnesium sulfate And an inorganic heat insulating board manufactured thereby.

According to a first aspect of the present invention, there is provided a method of manufacturing an inorganic heat insulating board using magnesium sulfate inorganic binder according to the first embodiment of the present invention, comprising the steps of: (a) stirring magnesium sulfate in water and heating to prepare a mixture; (b) adding a silicate solution to the mixture to prepare an inorganic binder; (c) primary molding step in which magnesium oxide is added to the inorganic binder and kneaded; (d) a secondary molding step for increasing the heat insulating performance by mixing pearlite with the inorganic heat insulating material manufactured by the primary molding; And (e) a drying step of placing the inorganic heat insulating material produced by the secondary molding in a mold, followed by pressing and drying at room temperature.

In the step (a), the mixing ratio of magnesium sulfate to water is 10 wt.%: 100 wt.% To 30 wt.%: 100 wt.%.

The step (a) is characterized in that magnesium sulfate and water are stirred at 50 to 80 ° C.

In addition, the step (b) may further include mixing the pellet solution with the silicate solution, and the pellet solution may include pine rosin, an organic solvent, and a dispersing agent.

In the step (b), the starch solution may be further mixed with the silicate solution, and the starch solution may include gelatinized starch and a dispersant.

In the step (b), 5 to 10 wt.% Of the silicate solution is mixed with respect to the total wt.% Of the mixture.

The step (b) is characterized in that the mixture and the silicate solution are mixed at 50 to 80 ° C.

In the step (c), 60 to 90 wt.% Of the magnesium oxide is mixed with respect to the total wt.% Of the inorganic binder.

The step (d) is characterized in that 5 to 20 wt.% Of the pearlite is mixed with respect to the total wt.% Of the inorganic heat insulating material.

In the step (d), an organic acid salt may be further mixed with the organic acid salt, such as pearlite, and the organic acid salt may be prepared by mixing an organic acid and a base compound and then performing a neutralization reaction.

Also, the step (d) may further include blending the blast furnace slag fine powder with the pearlite.

Further, the step (d) may further include mixing natural oil after mixing the pearlite.

Further, in the step (e), the inorganic heat insulating material produced by the secondary molding is put into a mold, pressed at a pressure of 1 to 3 MPa, and then dried at room temperature.

In addition, the inorganic heat insulating board according to the first embodiment of the present invention comprises 60 to 90 wt.% Of magnesium oxide and 5 to 20 wt.% Of perlite, based on the total wt.% Of the inorganic binder, , 10 to 30 wt.% Of magnesium sulfate, and 5 to 10 wt.% Of a silicate solution.

The method of manufacturing the inorganic heat insulating board using the magnesium sulfate inorganic binder according to the embodiment of the present invention and the inorganic heat insulating board manufactured thereby can improve the durability as compared with the conventional inorganic binder by using the magnesium sulfate, Implementation can be enabled.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart schematically showing a method of manufacturing an inorganic heat insulating board using a magnesium sulfate inorganic binder according to a first embodiment of the present invention; FIG.
Fig. 2 is a photograph of a sample of the inorganic heat-insulating board manufactured in Examples 1 to 4 of the present invention. Fig.

The present invention is capable of various modifications and various forms, and specific embodiments will be described in detail in the following description. It is to be understood, however, that this invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "comprises" or "having" is intended to indicate that there is a combination of features, numbers, steps, components, etc. described in the specification, Steps, components or the like in any way whatsoever without departing from the spirit and scope of the invention.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is a flowchart schematically showing a method of manufacturing an inorganic heat insulating board using a magnesium sulfate inorganic binder according to a first embodiment of the present invention.

1, a method for manufacturing an inorganic heat insulating board using magnesium sulfate inorganic binder according to a first embodiment of the present invention includes a stirring step (S10) of adding magnesium sulfate to water and heating to prepare a mixture, (S20) of adding a silicate solution to the inorganic binder to produce an inorganic binder, a primary molding step (S30) of kneading magnesium oxide into the inorganic binder produced, mixing the pearlite with the inorganic heat insulating material produced by the primary molding A secondary molding step S40 for increasing the heat insulating performance, and a drying step S50 for heating the inorganic insulating material manufactured by the secondary molding into a mold and pressing the molding at a normal temperature.

First, in step S10 (stirring step), the mixture can be prepared by adding magnesium sulfate to water and melting by heating.

Here, the mixing ratio of magnesium sulfate to water is preferably 10 wt.%: 100 wt.% To 30 wt.%: 100 wt.%.

If the magnesium sulfate is less than 10 wt.% With respect to 100 wt.% Of water, the strength after the formation of the inorganic heat insulating board is weak and it can not be used as a building or industrial heat insulating board. If the magnesium sulfate exceeds 30 wt.%, The strength of the board is strong, but the weight of the inorganic heat insulating board can be heavy, and there is a disadvantage in that it is not efficient because the effect of increasing the strength is less than the weight.

In addition, magnesium sulfate and water can be stirred at 50 to 80 캜, and a water bath method can be used.

At this time, the temperature of the hot water may be from 50 to 80 ° C. When the water temperature is lower than 50 ° C, the time for dissolving magnesium sulfate may be prolonged, and it is preferable to stir at the temperature of the hot water bath not exceeding 80 ° C.

In step S20 (mixing step), an inorganic binder may be prepared by adding a silicate solution to the mixture prepared in step S10 and mixing the mixture. At this time, the silicate solution may be added to the inorganic binder to increase the adhesive strength.

The silicate solution is an aluminum silicate containing 73% of silicon oxide (SiO2), 17% of aluminum oxide (Al2O33), 5% of potassium oxide (K2O), 3% of sodium oxide (Na20) ≪ / RTI >

Here, for the total wt.% Of the mixture, 5 to 10 wt.% Of the silicate solution can be mixed.

At this time, if the silicate solution is less than 5 wt.% With respect to the total wt.% Of the mixture, the effect of increasing the adhesive strength may be insignificant.

When the silicate solution is added to the mixture, the silicate is gelled. Therefore, it is necessary to redeposit the silicate solution to form an aqueous solution. When the amount exceeds 10 wt.%, It takes a long time to redissolve the gelation, There is a problem that it is not solved.

Further, the mixture and the silicate solution can be mixed at 50 to 80 캜, and a water bath method can be used. This is to solve the gelation of the silicate solution.

At this time, the temperature of the hot water may be 50 to 80 ° C. If the temperature of the hot water is progressed at this temperature, it may take a long time to change into the form of an aqueous solution by eliminating the gelation of the silicate solution.

That is, when the temperature of water is less than 50 ° C, the time for dissolving the gelation of the silicate solution may be prolonged. When the temperature exceeds 80 ° C, the water may evaporate to cause gelation and curing.

In step S20 (mixing step), the silicate mixed solution may be further mixed.

The pine juice may include rosin, an organic solvent, and a dispersant, which can be liquefied by dissolving the rosin in an organic solvent and mixing the dispersant.

Song Jin (Pine Resin) is a balsam that is secreted when a tree of pine tree is damaged and is also called a pine tree.

Such rosin can be obtained, for example, by scarring the tree of the pine tree. Pine rosin is a colorless transparent liquid at the time it is secreted from the tree, but has the property of being thin and sticky over time. Such rosin is known to comprise 70-75 wt.% Of rosin, 18-22 wt.% Of turpentine, and 5-7 wt.% Of water or other impurities. The rosin is composed of the components as described above, and it is possible to provide a rosin having excellent water resistance and moisture resistance. The rosin can be obtained by, for example, purchasing rosin circulated in the art or by filtering the rosin obtained by cutting off the roots of the pine tree to remove suspended solids and the like.

As the organic solvent, a solvent capable of dissolving the rosin may be used. The organic solvent may include at least one of an alcohol, an ether solvent, an ester solvent, an aromatic solvent, and a ketone solvent.

That is, an alcohol such as methanol, ethanol, propanol, butanol, pentanol, or hexanol may be used as the organic solvent; Ether solvents such as dimethyl ether, diethyl ether, methyl ethyl ether, dipropyl ether, methyl propyl ether, ethyl propyl ether, dibutyl ether, methyl butyl ether, ethyl butyl ether or propyl butyl ether; Ester solvents such as ethyl acetate and the like; Aromatic solvents such as benzene, toluene, xylene or naphtha; And a ketone-based solvent such as acetone, methyl ethyl ketone or methyl isobutyl ketone may be used alone or in combination. However, since this is only an embodiment of the present invention, have.

By mixing the dispersant into the pine juice, the mixture of water and the organic solvent of the pine juice can be mixed.

By adding such a pouring solution to the mixture, the waterproofing and moisture-proofing properties can be obtained, and the strength of the inorganic heat-insulating board to be produced can be improved. That is, the manufactured inorganic heat-insulating board can be resistant to humidity such as mold prevention.

In addition, the pine juice may contain 200 wt.% To 500 wt.% Of an organic solvent and 3 to 5 wt.% Of a dispersant, based on 100 wt.

As described above, when the 100% by weight of the rosin is dissolved in the organic solvent of 200% by weight to 500% by weight, the inorganic heat insulating board having high strength can be produced by pilling.

It is most preferable that 15 to 20 wt.% Of the pine juice is mixed with respect to the total wt.% Of the mixture in terms of strength improvement and moisture-proofing effect.

Further, in step S20 (mixing step), the starch solution may be further mixed after the silicate mixing.

The starch solution may comprise gelatinized starch and a dispersant.

That is, when the gelatinized starch and the dispersing agent are mixed, cross-linking is performed, and the viscosity and fluidity of the inorganic heat insulating material produced by adding the starch solution thus prepared to the mixture can be improved. Accordingly, it is easy to insert the inorganic heat insulating material in accordance with the frame, and cracks and cracks can be prevented during curing.

In addition, viscosities can be imparted so that each mixture can be mixed well with one another.

It is most preferable that 5 to 10 wt.% Of the starch solution is mixed with respect to the total wt.% Of the mixture in terms of strength improvement and moisture-proofing effect.

At this time, if the starch solution is less than 5 wt.% Based on the total wt.% Of the mixture, the effect of improving the fluidity of the inorganic heat insulating material is insignificant. If the starch solution exceeds 10 wt.%, Lt; / RTI >

In step S30 (primary molding step), magnesium oxide is added to the inorganic binder produced in step S20 and kneaded to produce an inorganic heat insulating material.

Here, 60 to 90 wt.% Of magnesium oxide may be mixed with respect to the total wt.% Of the inorganic binder.

If the magnesium oxide is less than 60 wt.% Based on the total wt.% Of the inorganic binder, the strength after the formation of the inorganic heat insulating board is weak. If the magnesium oxide exceeds 90 wt.%, The effect of increasing the weight is not exhibited.

In step S40 (secondary molding step), pearlite may be mixed with the inorganic heat insulating material produced in step S30. Perlite can be mixed with inorganic thermal insulation materials to reduce manufacturing costs while reducing the weight of inorganic insulation materials.

Here, 5 to 20 wt.% Of pearlite may be mixed with respect to the total wt.% Of the heat insulating material.

When the pearlite content is less than 5 wt.%, The effect of weight reduction by pearlite addition is insignificant. When the pearlite content exceeds 20 wt.%, The effect of weight reduction by pearlite is increased. However, The strength of the board is remarkably lowered.

In step S40 (secondary molding step), an organic acid salt such as pearlite may be further mixed with the inorganic heat insulating material.

The organic acid salt can be prepared by mixing an organic acid and a base compound through a neutralization reaction, and is added to an inorganic binder to have a corrosion inhibiting effect.

The organic acid may include one of acetic acid, formic acid, fumaric acid, oxalic acid, and succinic acid.

The base compound may comprise one of sodium hydroxide, calcium hydroxide and potassium hydroxide.

Here, 10 to 15 wt.% Of the organic acid salt may be mixed with respect to the total wt.% Of the inorganic heat insulating material.

In this case, when the organic acid salt is less than 10 wt.% With respect to the total wt.% Of the inorganic heat insulating material, the effect of preventing the corrosion by adding the organic acid salt is insignificant.

Further, in step S40 (secondary molding step), a blast furnace slag fine powder such as pearlite may further be mixed with the inorganic heat insulating material.

Blast furnace slag fine powders contain calcium hydroxide (CaOH ₂ ) and latent hydraulic materials as a by-product of iron smelting in the furnace. Such blast furnace slag fine powder can be mixed with an inorganic heat insulating material and react with an alkaline substance to improve the long-term strength of the inorganic heat insulating board to be produced.

Here, 5 to 15 wt.% Of blast furnace slag fine powder can be mixed with respect to the total wt.% Of the inorganic heat insulating material.

In this case, when the blast furnace slag powder is less than 5 wt.% Based on the total wt.% Of the inorganic heat insulating material, the effect of improving the long term strength by adding the blast furnace slag is insignificant. If the blast furnace slag exceeds 15 wt.%, May occur.

Further, in step S40 (secondary molding step), natural oil may be further mixed after mixing pearlite, organic acid salt, and blast furnace slag into the inorganic heat insulating material.

That is, by adding the natural oil to the inorganic insulating material, the viscosity of the inorganic insulating material can be adjusted and the fluidity can be controlled.

This makes it possible to easily insert the inorganic heat insulating material in conformity with the shape of the mold, and to prevent cracks and cracks during curing.

Natural oils are selected from the group consisting of avocado oil, castor oil, canola oil, Chinese wood oil, coffee oil, cottonseed or cottonoil, Corn oil, germ oil, Japanese wood oil, jojobaoil, kaya oil, linseed oil, macadamia nut oil, nut oil, olive oil, peanut oil, perilla oil, persic oil, rapeseed oil, rice bran oil, sesame seeds, Sesame seed oil, safflower oil, sasanqua oil, sunflower oil, soybean oil, tea seed oil, tsubaki oil, wheat seed oil, Wheat germ oil, olive pomace oil, green tea seed oil, neem oil, walnut oil, But are not limited to, evening primrose oil, lanolin (woolfat) oil, calendula oil, rosehip seed oil, coconut oil, maize oil, mustard oil, kukui nut oil, tamanu oil, palm plein oil, babassu oil, palm oil, borage oil, Palm kernel oil, apricot kernel oil, grapeseed oil, poppyseed oil, argan oil, flaxseed oil, almond oil, But are not limited to, almond oil, hazelnut oil, hemp seed oil, pumpkinseed oil, triglycerol, glyceryl trioctanoate, Glyceryl triisopalmitate, fish oils, herring oil, salmon oil, sardine oil (s sharkliver oil, whale oil, egg yolk oil, lard oil, mink oil, neatsfoot oil, tallow oil, oil, turtle oil, EMU oil, and ostrichoil, but not limited thereto, both vegetable and animal oils can be used.

Here, 3 to 7 wt.% Of natural oil can be mixed with respect to the total wt.% Of the heat insulating material.

If the amount of natural oil is less than 5 wt.% Based on the total wt.% Of the inorganic heat insulating material, it may be difficult to insert the inorganic heat insulating material in accordance with the shape of the mold. Problems may occur in curing and physical properties.

In step S50 (drying step), the inorganic heat insulating material produced by the secondary molding may be put into a mold, dried and then dried at room temperature.

That is, an inorganic heat insulating material manufactured by a secondary molding is put into a frame corresponding to the shape to be made, and the inorganic insulating board is manufactured by pressing at a pressure of 3 MPa to form a shape and drying at room temperature.

At this time, the pressing time may be maintained for 30 to 1 hour to form the shape. Since the amount of magnesium sulfate is small at the time of pressurization, the minimum pressure must be maintained.

As described above, the inorganic heat-insulating board can be manufactured by the method of manufacturing the inorganic heat-insulating board using the magnesium sulfate inorganic binder according to the first embodiment of the present invention.

The inorganic heat insulating board manufactured by the above-described manufacturing method comprises 60 to 90 wt.% Of magnesium oxide and 5 to 20 wt.% Of perlite, based on the total wt.% Of the inorganic binder, and the inorganic binder is 100 wt.% , 10 to 30 wt.% Of magnesium sulfate and 5 to 10 wt.% Of a silicate solution.

As described above, the method for manufacturing the inorganic heat insulating board using the magnesium sulfate inorganic binder according to the embodiment of the present invention and the inorganic heat insulating board manufactured by the method can produce the inorganic binder with magnesium sulfate, And enable the implementation of high thermal properties.

Hereinafter, the present invention will be described in more detail with reference to Examples.

However, the following examples are illustrative of the present invention, and the contents of the present invention are not limited by the following examples.

[ Example ]

[Example 1]

20 g of magnesium sulfate, 100 g of distilled water and 10 g of a silicate solution were mixed and stirred. Then, the mixture was mixed with 60 g of magnesium oxide and 10 g of expanded perlite, stirred until they were all kneaded, And then heated and pressurized at 150 DEG C for 1 hour to manufacture an inorganic heat insulating board.

[Example 2]

An inorganic heat insulating board was prepared in the same manner as in Example 1, except that the amount of magnesium oxide in Example 1 was changed from 70 g to 60 g.

[Example 3]

An inorganic heat insulating board was prepared in the same manner as in Example 1, except that the amount of magnesium oxide in Example 1 was changed from 80 g to 60 g.

[Example 4]

An inorganic heat insulating board was prepared in the same manner as in Example 1, except that the amount of magnesium oxide in Example 1 was changed from 90 g to 60 g.

[Comparative Example 1]

An inorganic heat insulating board was prepared in the same manner as in Example 1, except that the amount of magnesium sulfate in Example 1 was changed to 5 g instead of 20 g.

[Comparative Example 2]

An inorganic heat insulating board was prepared in the same manner as in Example 1, except that the amount of magnesium oxide in Example 1 was changed from 50 g to 60 g.

[Comparative Example 3]

An inorganic heat insulating board was prepared in the same manner as in Example 1, except that the amount of expanded pearlite was changed from 30 g to 10 g.

The following tests were carried out on the inorganic heat-insulating boards prepared in Examples 1 to 4.

[ Experimental Example  One: Of the inorganic insulation board  Thermal conductivity measurement]

The thermal conductivity of the inorganic heat-insulating board manufactured in Examples 1 to 4 was measured. For the measurement of the thermal conductivity, 50 X 50 X 10 (mm) thermal conductivity samples were prepared using the cutter on the inorganic heat insulating boards manufactured in Examples 1 to 4 above.

The thus prepared inorganic insulating board samples were measured by a hot-disk method and the results are shown in Table 1 below.

Measuring temperature (캜) Thermal conductivity (W / mK) Example 1 25 0.08155 Example 2 25 0.08644 Example 3 25 0.08958 Example 4 25 0.08920

As can be seen from Table 1, when the amount of magnesium oxide added is increased, the strength of the heat insulating board is increased, but the thermal conductivity is slightly increased, so that the heat insulating performance is slightly reduced.

From the results of Example 3 and Example 4, it can be seen that the addition amount of magnesium oxide does not affect the thermal conductivity more than the ratio of Example 3.

The following tests were conducted on the inorganic heat insulating boards manufactured in Examples 1 to 4 and Comparative Examples 1 to 3.

[ Experimental Example  2: Of the inorganic insulation board  Strength and impact resistance measurement]

The bending strength (according to KS L5114-03 standard) and the bending strength (according to KS F 3054-96) of the cement and concrete fields of the inorganic heat insulating boards prepared in Examples 1 to 4 and Comparative Examples 1 to 3 were measured, And impact resistance (according to KS F 3054-96) were measured and are shown in Table 2 below.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Flexural strength 30.1 30.2 31.2 32.1 18.2 17.5 17.3 Bending strength 221.5 221.9 223.4 224.5 132.2 127.4 119.9 Impact resistance clear clear clear clear Weak crack Slightly cracked Slightly cracked

As can be seen from the above Table 2, it can be seen that Examples 1 to 4 are much stronger in flexural strength, bending strength and impact resistance than Comparative Examples 1 to 3.

Having described specific portions of the present invention in detail, those skilled in the art will appreciate that these specific descriptions are only for the preferred embodiment and that the scope of the present invention is not limited thereby. It will be obvious. It is therefore intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

Claims (14)

(a) stirring step of adding magnesium sulfate to water and heating to prepare a mixture;
(b) adding a silicate solution to the mixture to prepare an inorganic binder;
(c) primary molding step in which magnesium oxide is added to the inorganic binder and kneaded;
(d) a secondary molding step for increasing the heat insulating performance by mixing pearlite with the inorganic heat insulating material manufactured by the primary molding; And
(e) a drying step of placing the inorganic heat insulating material produced by the secondary molding in a mold, and pressing the dried inorganic insulating material at a room temperature, and drying the magnesium inorganic binder.
The method according to claim 1,
The step (a)
Wherein the mixing ratio of magnesium sulfate to water is 10 wt.%: 100 wt.% To 30 wt.%: 100 wt.%.
The method according to claim 1,
The step (a)
And stirring the magnesium sulfate and water at 50 to 80 ° C to produce an inorganic insulating board.
The method according to claim 1,
The step (b)
And 5 to 10 wt.% Of the silicate solution is mixed with respect to the total wt.% Of the mixture. The method of manufacturing an inorganic heat insulating board using the magnesium sulfate inorganic binder.
The method according to claim 1,
The step (b)
And mixing the mixture with the silicate solution at 50 to 80 캜. The method of manufacturing the inorganic insulating board using the magnesium sulfate inorganic binder.
The method according to claim 1,
The step (b)
After mixing the silicate solution, the feed solution is further mixed,
The above-
A method for manufacturing an inorganic heat insulating board using magnesium sulfate inorganic binder, comprising the steps of:
The method according to claim 1,
The step (b)
After mixing the silicate solution, the starch solution is further mixed,
The starch solution,
A method for manufacturing an inorganic heat insulating board using magnesium sulfate inorganic binder, which comprises gelatinized starch and a dispersant.
The method according to claim 1,
The step (c)
Wherein the magnesium oxide inorganic binder is mixed with 60 to 90 wt.% Of the magnesium oxide with respect to the total wt.% Of the inorganic binder.
The method according to claim 1,
The step (d)
Wherein the pearlite is mixed in an amount of 5 to 20 wt.% With respect to the total wt.% Of the inorganic heat insulating material.
The method according to claim 1,
The step (d)
The organic acid salt is further mixed with the pearlite,
The organic acid salt,
Wherein the inorganic binder is prepared by mixing an organic acid and a base compound and neutralizing the mixture.
The method according to claim 1,
The step (d)
And further mixing the blast furnace slag fine powder as in the case of the pearlite.
The method according to claim 1,
The step (d)
And mixing the natural oil with the natural oil after mixing the pearlite. The method of manufacturing the inorganic heat insulating board using the magnesium sulfate inorganic binder.
The method according to claim 1,
The step (e)
Wherein the inorganic heat insulating material produced by the secondary molding is put into a mold and pressed at a pressure of 1 to 3 MPa and dried at room temperature.
Wherein the inorganic binder comprises 60 to 90 wt.% Of magnesium oxide and 5 to 20 wt.% Of perlite, based on 100 wt.% Of water, and 10 to 30 wt.% Of magnesium sulfate, 5 to 10 wt.% Of a solution.

Images