KR101955395B1 - Insulation multi-functional composite panel for construction - Google Patents

Abstract

A multifunctional insulating composite panel for construction is provided. A multifunctional composite panel according to an embodiment of the present invention comprises a core material formed by including a binder including a silicate-based component and an expansive mineral; An inner member attached to one surface or both surfaces of the core material; And a photocatalytic coating layer covering the outer surface of the inner member. According to this, heat resistance, antibacterial properties, air purification and self-cleaning characteristics are exhibited, and durability is maintained so that such properties can be maintained for a long time even in a harsh environment.

Description

{Insulation multi-functional composite panel for construction}

The present invention relates to a multifunctional composite panel for construction use, and more particularly, to a composite multifunctional composite panel having excellent heat resistance, antimicrobial property, air purification and self-cleaning properties, and excellent durability The present invention relates to a multifunctional composite panel for architectural use.

Generally, the term "perlite" refers to a property of expanding the volume by about 5 to 20 times when heated at about 1,000 ° C. as a mineral, and when formed into an expanded perlite board by the above-mentioned method, And excellent in heat insulation. Due to its porous property, it has excellent air-purifying and deodorizing effect, as well as excellent sound absorption and soundproofing effect. In addition, it absorbs moisture when it comes into contact with it and emits moisture when air is dried. It is known.

Such a perlite board is excellent in nonflammability, so that even if a fire occurs, it does not emit toxic gas and has a characteristic that it does not emit toxic gas, and absorbs radiation and electromagnetic waves including sound absorption and emits far infrared rays. In addition, it has excellent antimicrobial function and is known to have many useful effects such as excellent cutting performance by cutting using saw or cutting tool smoothly when formed.

However, it is difficult to maintain the incombustibility of the perlite and vermiculite, which are the raw materials of the inorganic insulating material, and the inorganic binder such as water glass, to form the insulating board It is difficult to maintain the shape thereof. In order to compensate the above problem, when the binder is added by adding a binder such as cement, there is a problem that the physical properties inherent in the above-mentioned expanded stone such as heat insulation are deteriorated.

Accordingly, it is advantageous to include the binder in an appropriate amount in the production of the heat insulating board, but even in such a case, the problem of swelling of the expanded stone is difficult to solve.

Meanwhile, the outer surface of the heat insulating board may be provided with subsidiary materials for manifesting different functions in the outer and inner interiors. When the surface of the heat insulating board is well crumbled and dust easily occurs, the subsidiary material easily peels off or cracks there is a problem.

Accordingly, it is an urgent need to develop a composite panel for construction that overcomes the above-mentioned problems.

Korean Patent Publication No. 2004-0023861

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a semiconductor device, which is capable of exhibiting thermal insulation, antibacterial property, air purification and self- And to provide a durable multi-functional insulation composite panel for construction.

In order to solve the above problems, the present invention provides a core material comprising a binder containing a silicate-based component and an expandable mineral; An inner member attached to one surface or both surfaces of the core material; And a photocatalytic coating layer covering the outer surface of the inner member.

According to an embodiment of the present invention, the intumescent mineral may include at least one of minerals of pearlite, obsidian, perlite, sandstone, pumice, vermiculite and shale.

The silicate-based component may be selected from the group consisting of polyoxyethylene octyl phenyl ether, polyethylene oxide, polypropylene oxide and polyethylene glycol in a solvent containing not less than 95% by weight of a lower alcohol having 1 to 4 carbon atoms. And then filtering the resultant solution by adding an alkali solution to the solution, followed by filtration. The nanosilicate powder may be prepared by, for example, dissolving an alkaline solution in an acidic solution under any one of the neutral surfactants.

The nanosilicate powder is prepared by adding 1 to 3 parts by weight of the neutral surfactant, 3 to 5 parts by weight of hydrochloric acid and 3 to 5 parts by weight of phosphoric acid as an acidic solution to 100 parts by weight of the tetraethyl orthosilicate, Deg.] C, and then dropwise adding sodium hydroxide solution or potassium hydroxide solution as the alkali solution, followed by filtration.

The binder may further comprise 40 to 70 parts by weight of sodium chloride, 20 to 30 parts by weight of sodium carbonate, and 5 to 20 parts by weight of aluminum hydroxide, based on 100 parts by weight of the silicate-based component. More preferably, the binder may include 5 to 10 parts by weight of aluminum hydroxide.

The silicate-based component may further include lithium silicate, and the lithium silicate may be added in an amount of 5 to 20 parts by weight based on 100 parts by weight of the nano-silicate powder, more preferably 10 to 20 parts by weight based on 100 parts by weight of the nano- 20 parts by weight.

In addition, the interior member may be any one or more interior or exterior interior members selected from the group consisting of HPM, LPM, aluminum, SUS, panel, and tile.

In addition, the photocatalytic coating layer coated on the inner member exhibits an air purifying function when the inner member is an inner interior member, and can manifest a self-purification function when the inner member is an outer interior member.

Also, the photocatalytic coating layer may be formed by applying a titanium dioxide colloid solution in which 1 to 5 wt% of titanium dioxide nanoparticles having anatase structure is dispersed and dried.

According to the present invention, the composite panel for construction is excellent in durability so that the properties such as heat insulation, antibacterial property, air purification and self-cleaning can be maintained in a harsh environment for a long time.

1 is a cross-sectional view of a composite panel according to an embodiment of the present invention.
2 is a photograph of a composite panel according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

1, a multifunctional insulating composite panel 100 according to an embodiment of the present invention includes a core 10 formed of a binder containing a silicate component and an expandable mineral, And a photocatalytic coating layer (31, 32) coated on the inner member (21, 22).

First, the core material 10 is formed through a binder with a mineral as a theme. The core material 10 includes a large number of pores through the inclusion of the expansive minerals to manifest flame retardancy, water resistance, heat insulation, sound absorption and the like. In addition, it does not generate smoke even in the event of a fire, thereby reducing the risk of harmful gas to the human body.

The intumescent mineral may be mined or synthesized by a known method, and expansive minerals conventionally used in the art can be used without limitation. For example, the intumescent mineral may include at least one of minerals such as perlite, obsidian, perlite, sandstone, pumice, vermiculite and shale. The inflatable mineral may be expanded by heat treatment. For example, the moisture content of the inflatable mineral may be at least 10% by selecting the basic constituent condition, and by heating the preheat temperature and the high temperature in the preheat furnace, Minerals can be obtained. At this time, although the expansion ratio may vary depending on the type of the specific mineral, it is preferably preheated at 250 to 350 ° C in a preheating furnace for 10 to 60 minutes, taken out of the furnace, cooled to room temperature in a drier, And expanding at a temperature of 1,100 to 1,300 DEG C for about 5 to 20 seconds to obtain an expandable mineral.

Binders that bind the above-mentioned expansive minerals to have a certain shape can be used as binders in heat insulating materials using known minerals. However, they exhibit improved inter-mineral bonding and mechanical strength, and are formed at room temperature and molded at a high temperature Which is environmentally friendly by suppressing the emission of carbon dioxide, and includes a silicate-based component for enhancing economy.

The silicate-based component is preferably selected from the group consisting of polyoxyethylene octylphenyl ether, polyethylene oxide, polypropylene oxide and polyethylene glycol in a solvent containing 95 wt% or more of a lower alcohol having 1 to 4 carbon atoms The nanosilicate powder may be prepared by hydrolyzing an acidic solution under any one of the selected neutral surfactants and then adding an alkali solution to the solution and filtering the mixture. 1 to 3 parts by weight of the neutral surfactant, 3 to 5 parts by weight of hydrochloric acid as the acidic solution and 3 to 5 parts by weight of phosphoric acid are added to 100 parts by weight of the tetraethyl orthosilicate, Followed by dropwise addition of sodium hydroxide solution or potassium hydroxide solution as the alkali solution, followed by filtration. When the tetraethyl orthosilicate compound is hydrolyzed with an alkali, a phenomenon in which the strength is lowered after curing may occur. In the present invention, a nanosilica solution is prepared by hydrolysis under acidic conditions other than alkali, and sodium hydroxide (NaOH) solution A potassium hydroxide (KOH) solution may be added dropwise to neutralize the pH, followed by filtration to produce a nanosilicate powder. The nanosilicate powder may be more advantageous in expressing the desired physical properties by satisfying the powder production conditions.

The core member 10, to which the expandable mineral is bonded and formed through the binder, is attached to one side or both sides of the interior members 21 and 22 described later. In the core member 10, It is difficult to attach the interior members 21 and 22, and even if they are attached, there is a problem that they can be easily peeled off. Further, when the core material is broken at a part of the mounting surfaces after the interior members 21 and 22 are attached, a clearance is generated between the core material and the interior member, and the clearance accelerates the cracking and peeling between the core material and the interior member There is a problem.

Accordingly, it is required that the core material 10 is suppressed to the maximum extent and the dust from which the minerals desorbed from the outer surface is minimized. In order to increase compatibility with the interior members described later, the binder according to one embodiment of the present invention As the silicate component, it further includes lithium silicate. More preferably, the lithium silicate is present in an amount of 5 to 20 parts by weight, more preferably 10 to 20 parts by weight, based on 100 parts by weight of the nano-silicate powder. If lithium silicate is contained in an amount of less than 5 parts by weight based on 100 parts by weight of the nano-silicate powder, it may be difficult to prevent dust or crumbling due to separation of the mineral particles located on the surface of the core material, It can be easily peeled off even if it is attached, and durability in a high temperature and high humidity environment can also be lowered. Further, if the lithium silicate is contained in an amount exceeding 20 parts by weight, the mechanical strength of the core material may be lowered, the interior member may not be easily adhered, and even if adhered, it may be easily peeled off and durability in a high temperature and high humidity environment And it may be difficult to fully manifest the desired properties such as the possibility of degradation.

The binder may further contain sodium chloride, sodium carbonate and aluminum hydroxide in addition to the silicate component. Preferably, the binder contains 40 to 70 parts by weight of sodium chloride, 20 to 30 parts by weight of sodium carbonate, 5 to 20 parts by weight. If any of the above components is unsatisfactory, it is difficult to attain desired physical properties such as deterioration of binding force with an interior member which will be described later due to a tendency of the mineral to easily desorb from the surface of the core.

Also, the binder may contain 5 to 10 parts by weight of the aluminum hydroxide relative to 100 parts by weight of the silicate component in order to improve the bonding strength with the interior member. If the amount of aluminum hydroxide exceeds 10 parts by weight, the increase in bonding force with the interior member is insignificant, and the content of sodium chloride and sodium carbonate mentioned above may be relatively small when the aluminum hydroxide is contained in an excessively large amount, which may weaken the mechanical strength of the core material .

In addition, the core 10 may further include fibers for enhancing mechanical strength, but the present invention is not limited thereto.

In addition, the core material 10 may contain 10 to 100 parts by weight, more preferably 50 to 100 parts by weight, of the binder with respect to 100 parts by weight of the expandable mineral.

Meanwhile, the core material 10 may be formed through a composition for core material, and the core material composition may include an expandable mineral and a binder, and may further include a solvent. The solvent may be used without limitation in the case of components which are easy to dissolve and / or disperse the expandable mineral, the binder and the blowing agent, and may be water, for example. The solvent may be included in an amount of 10 to 200 parts by weight based on 100 parts by weight of the expandable mineral, but is not limited thereto.

In addition, the thickness of the core 10 may be changed according to the intended use. Therefore, the present invention is not particularly limited thereto, and may be, for example, 50 to 350 mm.

Next, the interior members 21 and 22 attached to one or both surfaces of the above-described core member 10 will be described.

The interior members 21 and 22 may be a known interior material or exterior material, and any of them may be used. As an example of this, the interior member may be any one or more interior or exterior interior members selected from the group consisting of HPM, LPM, aluminum, SUS, panel, and tile.

The thickness of the interior members 21 and 22 may be 5 to 100 mm, but is not limited thereto.

Next, the photocatalytic coating layers 31 and 32 covering the outer surface of the above-described interior member exhibit air purification, self-purification and antibacterial functions, and the interior members 21 and 22 and / And functions to reduce the surface damage of the core material 10.

The photocatalytic coating layers 31 and 32 may be formed by applying a solution of titanium dioxide colloid in which 1 to 5 wt% of titanium dioxide nanoparticles having an anatase structure is dispersed and dried. The titanium dioxide colloid solution may be an aqueous or alcoholic titanium dioxide colloid solution, depending on the solvent used.

First, the aqueous titanium dioxide colloid solution is prepared by: A) dissolving and adding a titanium compound and a stabilizer to an alcohol sequentially; B) slowly adding the reacted solution to distilled water with stirring; C) neutralizing the resulting solution by adding a basic solution; And D) heating the solution at a temperature of 85 占 폚 or higher. The order of addition of the titanium compound and the stabilizer in the step A) may be added first. Further, it is possible to accelerate the hydrolysis reaction by adding a 40% aqueous solution of titanium tetrachloride in an amount of 0.01 to 2% by weight to the whole solution, after adding the titanium compound and before adding the stabilizer. At this time, a very vigorous exothermic reaction proceeds, and the reaction is carried out until sufficient heat is stopped while stirring. Stirring is continued for a sufficient time after adding distilled water in step B), preferably at room temperature for over 1 hour. In step C), the basic solution is slowly added while adjusting the pH of the solution to 6-8. If heated for more than 7 hours in step D), a clear and clear colloidal solution with anatase structure and titanium dioxide fine particles with a uniform size of less than 10 nm is dispersed.

Next, the alcoholic titanium dioxide colloid solution is prepared by: a) sequentially adding a titanium compound and a stabilizer to an alcohol to dissolve and react; b) neutralizing the resulting solution by adding a basic solution; c) heating the solution at a temperature of 75 DEG C or more for 7 hours or more.

The order of addition of the titanium compound and the stabilizer in the step a) may be added first. Also, before step b), 0.01 to 2% by weight of 40% aqueous solution of titanium tetrachloride may be added to the solution, or distilled water may be added to 2 to 10% by weight of the total solution to accelerate the hydrolysis reaction. The solution is also stirred for a sufficient time, preferably at least 1 hour, at ambient temperature. In step b), the pH of the solution is adjusted to 6-8 while slowly adding the basic solution. When heated for more than 7 hours in step c), a clear and clear colloidal solution is produced with anatase structure and titanium dioxide fine particles having a uniform size of less than 10 nm dispersed.

In the method for producing the aqueous or alcoholic titanium dioxide colloid solution, the heating step of steps D) and c) can be replaced by subjecting the hydrothermal reaction to a high temperature, high pressure reactor at a temperature of 120 ° C or higher for about 5 hours. When a colloidal solution is prepared by this hydrothermal reaction, a titanium dioxide colloid solution having a short reaction time and excellent structural crystallinity can be produced.

As a solvent, the alcohol which can be used may be a C1-C4 lower alcohol such as methanol, ethanol, propanol, isopropanol, butanol. When the titanium dioxide colloid solution is 100% by weight, the alcohol may be contained in the solvent in an amount of 1 to 50% by weight. If the amount of the alcohol is less than 1% by weight, the titanium dioxide colloid solution may be used as a solvent for diluting the titanium compound. When the amount of alcohol is more than 50% by weight, the solvent becomes alcohol, so that the above range is most appropriate. In the case of an alcohol system, when the amount of the titanium dioxide colloid solution is 100% by weight, the alcohol may be used in an amount of 50 to 90% by weight. If the amount of the alcohol is less than 50% by weight, If the alcohol content exceeds 90% by weight, the addition amount of the components such as the titanium compound and the distilled water is about 10% by weight, so that it does not exceed 90% by weight.

As the titanium compound, any known titanium compound can be used and can be appropriately selected depending on the solvent. However, when an inorganic titanium compound such as titanium tetrachloride or titanium sulfate is used, caustic soda is excessively added at the time of neutralization and the concentration of the salt in the solution is too high. Therefore, rather than using the inorganic titanium compound alone, It is preferable to use them in combination with the compound. Titanium (IV) ethoxide (titanium tetraethanolate), titanium (IV) methoxide, titanium (IV) stearate, (IV) isopropoxide (tetraisopropanol titanium) may be used as the catalyst, and more preferably, titanium (IV) isopropoxide may be used. The titanium compound is added in a concentration of 1 to 5% by weight in the resulting titanium dioxide colloid solution.

The stabilizer may be selected from the group consisting of an organic acid having an alcohol group and a ketone group, an organic acid having an alcohol group and an acetate group, and a salt thereof. Examples of the organic acids include glycolic acid and glycolic acid salts, organic acids and salts thereof having a structure similar to glycolic acid, oxalic acid and oxalic acid salts, or mixtures thereof. In addition, the stabilizing agent is added to the pentane diol, pentane-dione, butanediol, butanedione, alkyl acetoacetate, polyethylene glycols, cetyl trimethyl ammonium hydroxide, polyvinyl acetate, polyvinyl alcohol, trialkyl alcohol amines ((RO) ₃ N ) Or mixtures thereof. The amount of the stabilizer to be added may vary depending on the molecular weight of the stabilizer, and may be 0.1% by weight or more when the amount of the titanium dioxide colloid solution is generally 100% by weight. If it is less than 0.1% by weight, the stabilizing action is not sufficient and the particles may become large. Preferably, the stabilizer is added in an amount of 1 to 3% by weight, and if it exceeds 3% by weight, there is a fear of an increase in cost.

When the glycolic acid aqueous solution is used as the stabilizer, it is preferable to reduce the amount of the alkaline aqueous solution used for neutralization. When polyethylene glycol is used, the amount to be added is controlled depending on the molecular weight of polyethylene glycol. When the molecular weight is about 3000, about 0.1 to 2% by weight is added. When a mixture of polyethylene glycol and glycolic acid is used, glycolic acid is added and after sufficient reaction, polyethylene glycol is added to prevent precipitation. When polyvinyl acetate is used, it is added in an amount of about 0.1 to 2% by weight for a molecular weight of about 100,000, depending on the molecular weight. As the molecular weight of polyvinyl acetate increases, solubility is very small, so it is effective to use a polymer having a low molecular weight. When polyvinyl alcohol is used, the solubility of polyvinyl alcohol is lower than that of polyvinyl acetate. Therefore, if a low molecular weight polyvinyl alcohol is used and a little heat treatment is performed after the addition, the solubility increases and the stability of the resulting colloid solution is more effective.

As the basic solution used in the neutralization step, a solution of all the basic compounds is possible, and it is appropriately selected depending on the adhesion of the colloidal solution to be produced and the application to be used. Preferable examples include caustic soda, alkali metal basic compounds, ammonia, alkylammonium basic compounds, alkaline earth metal basic compounds, and polyvalent cationic basic compounds such as aluminum ions. In particular, ammonia acts as a strong Lewis base as a strong ligand to titanium ions, and thus has a great effect of preventing aggregation of titanium dioxide.

Since the amount of the basic solution added may vary depending on the type of the stabilizer, a pH meter is installed in the reaction tank to adjust the amount of the basic solution so that the pH is in the range of 6-8. In addition, in the neutralization step, water glass or sodium metasilicate may be added to neutralize the solution, instead of the basic solution. In this case, the resulting titanium dioxide colloid solution is more excellent in adhesion.

The titanium dioxide colloid solution may be reacted by adding an organic silicon compound, an aluminum compound, a zirconium compound, an iron compound or a mixture thereof in addition to the titanium compound. The organic silicon compound may be an organic compound having an alkoxy group, an organic silicon compound having an alkyl acetoacetate functional group, An organic silicon compound having a glycolide, an acetate group adjacent to an alcohol group, or a ketone group; An organosilicon compound having an ester group and an amine group; An organic silicon compound having a ketone group and an epoxy group, and the like. Examples of the aluminum compound include an aluminum acetate salt and an aluminum chloride salt.

In addition, the organosilicon compound is added in such a manner that the ratio of dispersed TiO ₂ : SiO ₂ or the like in the resulting colloid solution becomes 2: 1 or less (50% by weight or less based on the content of titanium dioxide). When an organic silicon compound or the like is added together with the titanium dioxide compound and hydrolyzed, the adhesion of the resulting colloid solution to the molded product is further improved.

In addition, the aqueous or alcoholic titanium dioxide colloid solution was cooled to room temperature, and then 1 mL was taken, diluted with water or alcohol (5 mL), and the ultraviolet absorption pattern was analyzed using an ultraviolet / visible ray spectroscope to determine the size and size of the nanoparticles Can be predicted.

The titanium dioxide colloid solution may be a neutral or transparent aqueous or alcoholic titanium dioxide colloid solution in which titanium dioxide nanoparticles are dispersed in an amount of 1 to 5 wt%. If the amount of the titanium dioxide nanoparticles dispersed in the solution is less than 1 wt%, an appropriate coating layer may not be formed at the time of coating. When the amount exceeds 5 wt%, the titanium dioxide nanocolloid dispersed in the solution may aggregate to increase the particle size. Do.

The titanium dioxide nanoparticles may have a uniform particle diameter of 10 nm or less.

The above-mentioned titanium dioxide colloid solution is coated on the outer surface of the core material to form a coating layer, and the coating can be carried out by a known coating method, for example, spraying, dipping, comma coater or the like. The coated titanium dioxide colloid solution may be dried at 20 to 30 ° C without additional heat treatment to form a coating layer or separate heat to form a coating layer.

The thickness of the photocatalytic coating layers 21 and 22 formed through the photocatalytic coating layers 21 and 22 may be 0.01 to 5 mm, but the present invention is not limited thereto.

Hereinafter, a method of manufacturing a composite panel according to an embodiment of the present invention will be described. The composite panel may be manufactured by independently manufacturing the core and the interior member, combining the core and the interior member through a post-process, or combining the interior member during the curing of the core. However, when they are independently manufactured and then joined together through a post-process, a separate binder should be interposed between the core and the interior member, but it may be unfavorable as a composite panel for building due to the side effect due to the binder, The desired properties may not be fully expressed.

Accordingly, it is preferable that the composite panel according to an embodiment of the present invention is manufactured by a method in which the composite panel is combined with the interior member during the curing process of the core. At this time, the photocatalytic coating layer may be provided on the core member before curing and may be placed on the core member before curing, or may be provided on the surface of the interior member after the uncoated interior member is combined with the core member .

Specifically, the above-mentioned composition for a core material may be injected into a desired mold, and then the interior member may be placed on the core material composition, and heat and / or pressure may be simultaneously or sequentially applied to integrate the core material and the interior member into a single panel . In the case of a composite panel having an interior member coupled to both sides of a core material, a lower interior member is disposed on the lower surface of the molding frame, a composition for core material is injected onto the upper portion of the lower interior member, It will be apparent that the present invention can be manufactured through a method in which

The composition for core material is in contact with the interior member before drying and curing and the bonding force is generated between the core member and the core member which is hardened as well as the expansive mineral due to the bonding agent in the composition for core member so that they can be integrated without a separate binder. In order to dry and cure the composition for core material, heat and / or pressure may be applied, more preferably both heat and pressure may be applied, and heat and pressure may be applied simultaneously or after the pressure is first applied, There is an advantage that the improved strength of the core / interior member and the mechanical strength of the core material can be manifested.

The heat may be applied at a temperature of preferably 50 to 150 ° C, more preferably 70 to 120 ° C, and the heat treatment time may be 5 to 60 minutes. However, the temperature and time of the applied heat are not limited thereto, and the processing time may be changed in an appropriate time according to the temperature of the applied heat.

In addition, the pressure may be 5 to 20 kg / mm ² , thereby increasing the density of the core material and advantageously exhibiting improved mechanical strength. However, the present invention is not limited to the above pressure, but may be changed in consideration of the thickness and density of the core material to be implemented.

The composite panel according to one embodiment of the present invention can be widely applied as a building material because it has heat insulation, antibacterial, air purification and self-purification functions.

The present invention will now be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Example 1 >

First, a nanosilicate powder was prepared to prepare a binder. Specifically, 100 g of tetraethyl orthosilicate was placed in a mixed solvent of 200 g of isopropyl alcohol and 5 g of water and 1.0 g of Triton X-100 (Sigma) was added while stirring at 25 DEG C, 3.0 g of phosphoric acid and 3.0 g of hydrochloric acid were added, After hydrolysis at 50 ° C, 10% by weight sodium hydroxide (NaOH) was adjusted to pH 7.5 from 7.0, and the mixture was left at 25 ° C for 10 minutes and filtered to obtain 28.0 g (yield: 97.2%) of white crystalline nano- . To 100 parts by weight of the prepared nanosilicate powder, 50 parts by weight of sodium chloride, 25 parts by weight of sodium carbonate and 8 parts by weight of aluminum hydroxide were mixed.

Then, 75 parts by weight of the binder and 90 parts by weight of water were mixed with 100 parts by weight of the mixed expandable mineral containing 50% by weight of pearlite and vermiculite as an expansive mineral, respectively, to prepare a composition for core material.

Thereafter, SUS, which is an interior member having a thickness of 10 mm, was placed on the lower side of a mold having a width of 40 cm and a height of 20 cm, and the prepared core composition was filled in a mold. Respectively. Thereafter, the mixture was molded at a pressure of 8 kg / mm ^{2 on} the upper and lower sides of the mold, dried in a drying furnace and dried at 80 ° C for 10 minutes to prepare a composite panel having a total thickness of about 10 cm.

Then, 6 g of glycolic acid was dissolved in 100 ml of ethanol as a coating solution for forming a photocatalytic coating layer on top of SUS as the interior member, and then 150 g of titanium tetraethanolate and 5 g of TEOS (TetraEthoxySilane) were dissolved. To this solution was added 2 mL of a 40% aqueous solution of titanium tetrachloride to carry out a hydrolysis reaction, then slowly added to 500 mL of distilled water with vigorous stirring, and stirring was continued at 25 ° C for 1 hour. To the resulting solution, a 3M aqueous sodium hydroxide solution was slowly added to the solution to adjust the pH of the solution to 7. The solution was heat treated at 85 ° C for 7 hours to produce a clear and clear colloidal solution. The resulting colloidal solution was applied to an upper part of SUS as an interior member and then dried in shade at 25 DEG C for 1 day to produce a composite panel for construction as shown in the following Table 1 in which a photocatalytic coating layer having a thickness of 0.08 mm was formed.

≪ Examples 2 to 7 >

A composite panel as shown in Table 1 below was prepared using the binder prepared in the same manner as in Example 1 except that lithium silicate powder was added to the silicate component of the binder in the same amount as shown in Table 1 below.

≪ Examples 8 to 13 >

The composite panel as shown in Table 2 below was prepared using the binder prepared in the same manner as in Example 1 except that the aluminum hydroxide content of the binder was changed as shown in Table 1 below.

≪ Comparative Example 1 &

Except that no binder was added, to prepare a composite panel for construction as shown in Table 2 below.

<Experimental Example>

The following properties of the composite panels according to Examples and Comparative Examples were measured and shown in Table 1 and Table 2.

1. Evaluation of brittle of core

The degree of shrinkage was measured by measuring the initial weight of each specimen, and then, only the core exposed on the four sides on which the interior member was not formed was given a force with a steel member After scratching lightly five times, the powder collected on the surface of the four sides of the core was collected by a brush and the weight of the collected powder was measured. The amount of dust measured was converted into a percentage of the initial weight and then averaged.

2. Evaluation of adhesion between inner member and core

The sections of the specimens were cut and evaluated for the degree of adhesion between the different substrates with the naked eye. As a result of naked eye evaluation, the length of the part where the interior member was lifted or peeled off was measured, and the measured total length was expressed as a percentage of the total length of the specimen cross section observed.

3. Evaluation of Durability of Composite Panels

The specimen was stored in a reliability chamber set at 85 ° C and 85% relative humidity for 30 days, and the cross section was cut to evaluate the degree of adhesion between the different substrates with the naked eye. As a result of naked eye evaluation, the length of the part where the interior member was lifted or peeled off was measured, and the measured total length was expressed as a percentage of the total length of the specimen cross section observed.

Example
One Example
2 Example
3 Example
4 Example
5 Example
6 Example
7 Binder
(Parts by weight) Silicate system Nano silicate 100 100 100 100 100 100 100 Lithium silicate 0 3 6 9 11 18 22 Sodium chloride 50 50 50 50 50 50 50 Sodium carbonate 25 25 25 25 25 25 25 Aluminum hydroxide 8 8 8 8 8 8 8 Composite panel Core material breakage (%) 30.8 14.5 5.8 5.5 2.1 2.4 4.8 Adhesion (%) 12.9 4.6 2.7 2.5 2.3 2.4 3.8 durability(%) 22.4 20.5 10.8 8.6 3.4 3.2 4.9

Example
8 Example
9 Example
10 Example
11 Example
12 Example
13 Comparative Example
One Binder
(Parts by weight) Silicate system Nano silicate 100 100 100 100 100 100 - Lithium silicate 11 11 11 11 11 11 - Sodium chloride 35 50 50 50 50 50 100 Sodium carbonate 25 15 25 25 25 25 50 Aluminum hydroxide 8 8 3 6 11 22 16 Composite panel Core material breakage (%) 13.6 15.6 14.1 6.6 6.4 10.8 68.2 Adhesion (%) 6.8 6.3 6.5 2.8 4.4 4.6 26.8 durability(%) 12.3 12.5 12.5 3.6 7.2 10.8 60.7

In Table 1 and Table 2, the contents of sodium chloride, sodium carbonate, and aluminum hydroxide in the binder among the binders in the examples are parts by weight based on 100 parts by weight of the silicate-based component, and in the case of Comparative Example 1, The content of sodium carbonate and aluminum hydroxide is expressed in parts by weight.

As can be seen from Tables 1 and 2 above,

In the case of Comparative Example 1 using a binder containing no silicate-based component, it can be seen that the core material is significantly inferior in brittleness, adhesion, and durability as compared with Examples.

Also, it can be seen that Examples 2 to 7 having lithium silicate among the Examples have a greater core brittle than Example 1. However, even in the case where lithium silicate is provided, it can be confirmed that Examples 3 to 6 within the preferred range of the present invention have fewer core bumps than Examples 2 and 7.

On the other hand, when any of the components of the binder in the form of sodium chloride, sodium carbonate and aluminum hydroxide is used in Examples 8, 9, 10 and 13, which are outside the preferred range of the present invention, compared with Example 5 using the same silicate- And durability are both lowered. Particularly, in Examples 10 and 13 in which the content of aluminum hydroxide is out of the preferable range of the present invention, the shrinkage of the core material is not better than that of Examples 3 and 11 and 12, have.

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 exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: core
21, 22: absence of interior
31, 32: photocatalyst coating layer

Claims (7)

Core material molded with a binder and an expandable mineral containing 40 to 70 parts by weight of sodium chloride, 20 to 30 parts by weight of sodium carbonate and 5 to 10 parts by weight of aluminum hydroxide based on 100 parts by weight of the silicate-based component;
An inner member attached to one surface or both surfaces of the core material; And
And a photocatalytic coating layer covering the outer surface of the inner member,
Wherein the silicate-based component is at least one selected from the group consisting of polyoxyethylene octylphenyl ether, polyethylene oxide, polypropylene oxide, and polyethylene glycol in a solvent containing 95 wt% or more of a lower alcohol having 1 to 4 carbon atoms Functional composite panel comprising 10 to 20 parts by weight of lithium silicate based on 100 parts by weight of the nanosilicate powder prepared by hydrolysis with an acidic solution under one neutral surfactant and then filtering the mixture with an alkali solution. delete delete delete The method according to claim 1,
Wherein the photocatalytic coating layer is formed by applying a solution of titanium dioxide colloid in which 1 to 5 wt% of titanium dioxide nanoparticles having an anatase structure is dispersed and dried. delete delete

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