KR102465290B1 - complex insulation and manufacturing method thereof - Google Patents

Abstract

A composite insulation material and a manufacturing method thereof are provided. The composite insulation material according to a preferred embodiment of the present invention is a composite insulation material in which a flame retardant sponge, a first adhesive member, a copper-coated nonwoven fabric, a second adhesive member, and a conductive sponge are sequentially stacked. The copper-coated nonwoven fabric includes a nonwoven fabric, and a copper coating layer formed on the surface of the nonwoven fabric. The copper coating layer of the copper-coated nonwoven fabric is in contact with the second adhesive member, and the copper coating layer may have a thickness of 5 to 55 nm when the basis weight of the nonwoven fabric of the copper-coated nonwoven fabric is 70 g/m^2. The composite insulation material of the present invention has excellent insulation performance, flame retardant performance, noise and vibration blocking performance, soundproofing performance, and durability.

Description

Composite insulation and manufacturing method thereof

The present invention relates to a composite insulating material and a manufacturing method thereof.

In general, fiber members such as glass wool and mineral wool to reduce the transmission of vibration and noise generated in automobiles, ships, interior and exterior walls of buildings, and internal and external piping of buildings to the outside and provide insulation effect. material), urethane foam, and foamable synthetic resins such as sponges are used.

However, in the case of these conventional dustproof, soundproofing and insulating materials, there have been cases where there have been restrictions in their use due to the generation of toxic substances or safety reasons. In particular, in the case of foamable synthetic resins such as urethane foams, because they are flammable, harmful toxic substances are generated during manufacturing or fire, and in the case of vitrified fibers such as glass wool, glass microfibers scatter when used due to low mechanical strength, and this causes work There was a sense of bitterness.

Republic of Korea Patent Publication No. 10-0752266 (published on August 20, 2007)

The present invention has been devised in consideration of the above points, and a composite insulation material having excellent thermal insulation performance, flame retardant performance, noise/vibration blocking performance, sound insulation performance, and durability in which such effects can be maintained for a long period of time and a manufacturing method thereof It is intended to provide

In addition, it is another object to provide a composite insulation material and a manufacturing method thereof that can also have antibacterial and antiviral effects.

In order to solve the above problems, the composite insulation of the present invention may be one in which a flame retardant sponge, a first adhesive member, a copper-coated nonwoven fabric, a second adhesive member and a conductive sponge are sequentially stacked.

In a preferred embodiment of the present invention, the copper-coated non-woven fabric includes a non-woven fabric and a copper-coated layer formed on the surface of the non-woven fabric.

In a preferred embodiment of the present invention, the copper coating layer of the copper-coated nonwoven fabric may be in contact with the second adhesive member.

In a preferred embodiment of the present invention, when the basis weight of the nonwoven fabric is 70 g/m 2 , the copper coating layer may have a thickness of 5 to 55 nm.

In a preferred embodiment of the present invention, the nonwoven fabric may include at least one selected from polypropylene fibers, polyethylene phthalate fibers, polybutylene phthalate fibers, nylon fibers, wood pulp fibers and glass fibers.

In a preferred embodiment of the present invention, the copper coating layer may include at least one selected from copper, copper (I) oxide, copper (II) oxide, copper (I) sulfide, and copper (II) sulfide.

On the other hand, the manufacturing method of the composite insulating material of the present invention is a first step of applying a first adhesive composition to one surface of a flame-retardant sponge, and laminating a copper-coated nonwoven fabric on the surface to which the first adhesive composition is applied, 2A second step of applying an adhesive composition and laminating a conductive sponge on the surface to which the second adhesive composition is applied to prepare a laminate, and curing the laminate to form a flame-retardant sponge, a first adhesive member, a copper-coated nonwoven fabric, 2 It may include a third step of manufacturing a composite insulating material in which the adhesive member and the conductive sponge are sequentially stacked.

In a preferred embodiment of the present invention, the copper-coated nonwoven fabric comprises the steps of (1) preparing a nonwoven fabric; and (2) forming a copper coating layer on the surface of the nonwoven fabric through a deposition method to produce a copper coated nonwoven fabric, wherein the copper coated nonwoven fabric has a basis weight of 70 g/m 2 , a copper coating layer may have a thickness of 5 to 55 nm.

The composite insulation material and the manufacturing method thereof according to the present invention have excellent thermal insulation performance, flame retardant performance, noise and vibration blocking performance, and sound insulation performance, and have durability that can be maintained for a long time even in harsh environments such as frequent vibrations. Therefore, it can be widely used in automobiles, ships, interior and exterior walls of buildings, and piping inside and outside buildings.

In addition, the composite insulation material and the method for manufacturing the same according to the present invention may also have antibacterial and antiviral effects by including the copper-coated nonwoven fabric.

1 is a cross-sectional view of a copper-coated nonwoven fabric according to a preferred embodiment of the present invention.
2 is a scanning electron microscope (SEM) image of a copper-coated nonwoven fabric according to a preferred embodiment of the present invention.
3 is a cross-sectional view of a copper-coated nonwoven fabric according to another preferred embodiment of the present invention.
4 is a view showing a vapor deposition machine for manufacturing a copper-coated nonwoven fabric according to a preferred embodiment of the present invention.
5 is a cross-sectional view of a composite insulating material according to a preferred embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar components throughout the specification.

5, the composite insulating material 100 of the present invention is a flame-retardant sponge 130, a first adhesive member 110, a copper-coated nonwoven fabric 10, a second adhesive member 120, and a conductive sponge 140 ) is sequentially laminated as a composite insulation 100, the copper-coated non-woven fabric 10 includes a non-woven fabric 30 and a copper coating layer 50 formed on the surface of the non-woven fabric 30, and a copper coating layer of the copper-coated non-woven fabric ( 50) may be in contact with the second adhesive member 120 .

First, referring to the copper-coated non-woven fabric 10, the copper-coated non-woven fabric of the present invention is a non-woven fabric 30 and copper coating layers 50 and 70 formed on the surface of the non-woven fabric 30, as shown in FIGS. ) is included. At this time, the copper coating layers (50, 70) is a nonwoven fabric ( As being formed on the surface of the 30), the surface of the nonwoven fabric 30 includes a surface located inside in addition to the surface exposed to the outside. Specifically, the nonwoven fabric 30 is an aggregate of fibers having pores on the outer surface and/or the inner surface, and the melt forming the copper coating layers 50 and 70 passes through the pores as well as the outer surface of the nonwoven fabric 30 . It penetrates into a portion of the inner surface of the nonwoven fabric 30 and a portion is cured. At this time, the molten material may be cured on only a portion of the inner surface of the nonwoven fabric 30 without blocking all of the internal pores of the nonwoven fabric 30 . In addition, the copper melt is cured to have a certain thickness on one surface of the nonwoven fabric 30 as described in FIG. 1 to form a copper coating layer 50, or has a certain thickness on both sides of the nonwoven fabric 30 as described in FIG. It can be cured to form the copper coating layers 50 and 70 .

The copper coating layer (50, 70) is in contact with microorganisms such as bacteria or viruses floating in the air before the nonwoven fabric 30, and disturbs the metabolism of microorganisms through the Oligodynamic Effect, It can produce antibacterial and antiviral effects. Through this, the copper-coated nonwoven fabric of the present invention may have antibacterial and antiviral properties.

Referring to FIG. 2 , in the nonwoven fabric 30 according to an embodiment of the present invention, a plurality of nonwoven fibers 31 are entangled with each other to form a wide plate structure. In this process, a ventilation hole 33 through which air passes is formed between the nonwoven fabric fibers 31 , and the nonwoven fabric 30 can pass external air through the ventilation hole 33 . At this time, the nonwoven fibers 31 constituting the nonwoven fabric 30 are thermoplastic fibers including at least one selected from polypropylene fibers, polyethylene phthalate fibers, polybutylene phthalate fibers, nylon fibers, wood pulp fibers and glass fibers. can

The nonwoven fabric 30 composed of such thermoplastic fibers may be manufactured by a thermal bonding method in which the nonwoven fabric fibers 31 are slightly melted through heat so that the nonwoven fabric fibers 31 have a mutual bonding force.

When the nonwoven fabric 30 is manufactured in a thermal bonding method, the surface of the nonwoven fabric fiber 31 is smoothly modified by heat, so that the metal material can be easily deposited when depositing a metal material such as copper even after the nonwoven fabric 30 production is completed. have.

On the other hand, the nonwoven fabric 30 may be made of mineral materials such as vegetable fibers or glass fibers such as wood pulp fibers, but is not limited thereto.

On the other hand, comprising at least one selected from copper, copper (I) oxide, copper (II) oxide, copper sulfide (I) and copper (II) sulfide constituting the copper coating layer 50 according to an embodiment of the present invention The composition may be formed by depositing on one or both surfaces of the nonwoven fibers 31 constituting the nonwoven fabric 30 .

In the copper coating layer 50 , the copper temperature or copper ions constituting the copper coating layer 50 may flow into the microorganisms, thereby destroying the internal structures and cell walls of the microorganisms through high reactivity.

The copper element or copper ion used in this process is very small, and the remaining copper element or copper ion remains in the copper coating layer 50 semi-permanently, thereby destroying microorganisms in contact with the outer surface of the copper coating layer 50 .

In addition, even if copper reacts with oxygen or sulfur in the air to become copper oxides or copper sulfides, copper ions also have antibacterial properties, so it can have antibacterial and antiviral properties continuously regardless of the presence or absence of oxidation.

Through this, the copper-coated nonwoven fabric of the present invention may have semi-permanent antibacterial performance.

On the other hand, as shown in Figure 2, in an embodiment of the present invention, the copper coating layer 50 does not block the ventilation hole 33 formed in the nonwoven fabric 30, but rather a part of the ventilation hole 33 on the inner surface of the It is deposited on the outer surface of the located nonwoven fiber 31 , and can destroy microorganisms in the air passing through the ventilation hole 33 .

On the other hand, in the copper-coated nonwoven fabric, when the basis weight of the nonwoven fabric is 70 g/m 2 , the copper coating layer may have a thickness of 5 to 55 nm, preferably 15 to 35 nm, and if the copper coating layer is less than 5 nm thick, copper Or, the bonding force between copper compounds is weakened, so that copper or copper compounds are separated from the copper coating layer and float in the air. do.

Meanwhile, in an embodiment of the present invention, when the copper coating layer 50 is made of copper metal, an electrode may be connected to the copper metal to form a voltage. The voltage applied to the copper coating layer 50 charges the dust passing through the vent hole 33 , and the charged dust adheres to the inner surface of the vent hole 33 by electromagnetic attraction.

Through this, in an embodiment of the present invention, the copper coating layer 50 may remove dust through electromagnetic attraction.

Additionally, the copper-coated nonwoven fabric of the present invention may further include a durability reinforcing layer on one surface of the copper coating.

The durability reinforcing layer may be a fabric obtained by weaving or knitting glass fibers, and specifically, may be a fabric in which glass fibers are twilled. In addition, when the copper-coated nonwoven fabric of the present invention has a basis weight of 70 g/m 2 , the durability-reinforced layer may have a thickness of 1 to 10 nm, preferably 3 to 7 nm, and if the thickness is less than 3 nm, the durability is strengthened The effect may be reduced, and there may be a problem in that the physical properties to be achieved in the present invention are reduced.

Meanwhile, the method of manufacturing a copper-coated nonwoven fabric according to an embodiment of the present invention may include a first step and a second step.

The first step may be to prepare a copper-coated nonwoven fabric. Specifically, the nonwoven fabric prepared in the first step may be composed of one or more thermoplastic plastic fibers selected from polypropylene fibers, polyethylene phthalate fibers, polybutylene phthalate fibers, and nylon fibers.

The nonwoven fabric made of a thermoplastic material allows the fibers to be bonded to each other through a thermal bonding process, and by modifying the surface of the fiber, copper or copper compound can be easily deposited on the outer surface of the nonwoven fabric.

Next, in the second step of the method for manufacturing a copper-coated nonwoven fabric of the present invention, a copper coating layer is formed on the surface of the nonwoven fabric prepared in the first step through a deposition method, thereby manufacturing a copper-coated nonwoven fabric.

Specifically, in the second step, the nonwoven fabric prepared in the first step and copper or a copper compound are put into the evaporator to prepare a copper-coated nonwoven fabric having a copper coating layer formed on the surface of the nonwoven fabric.

At this time, although it depends on the type of copper or copper compound, copper or copper compound may be deposited on the surface of the nonwoven fabric by preferably physical vapor deposition (PVD). In the physical vapor deposition method, a physical stimulus such as heat, electron beam, or high voltage is applied to copper or a copper compound to vaporize the constituents of the copper or copper compound, and then the vaporized particles can be attached to the surface of the nonwoven fabric.

4 is a view showing a vapor deposition machine for manufacturing a copper-coated nonwoven fabric according to a preferred embodiment of the present invention.

Among these, when copper, which is a metal, is used, a vacuum metallizing process may be preferably used. Referring to FIG. 4 , the metal vacuum deposition apparatus may include a cooling drum 1 , an unwinder 2 , a rewinder 3 , and a heat source 4 .

The cooling drum (1), the unwinder (2), and the rewinder (3) may have a non-woven fabric wound on them, and as the unwinder (2) rotates, the non-woven fabric is released and supplied, and the rewinder (3) rotates. As the nonwoven fabric is wound along, the nonwoven fabric is transported. At this time, the nonwoven fabric may be transferred along the surface of the cooling drum 1 disposed between the unwinder 2 and the rewinder 3 .

The heat source 4 may use any one of physical, chemical, induction heating, or electron beam heating method to melt the inputted copper into a copper molten state.

Specifically, the process of forming the copper coating layer on the surface of the nonwoven fabric using a vapor deposition machine is as follows.

Step 1 - First, remove or block the gas generated by burning moisture, dust, and chemical substances with low heat resistance contained in the non-woven fabric and substances that migrate, such as plasticizers, emulsifiers, or antibacterial agents.

Step 2 - In a low vacuum (760 10 ^-3 torr) state, moisture and other foreign substances contained in the inside of the evaporator shown in FIG. 4 and the nonwoven fabric are extracted.

Step 3 - Operate the DP pump to create a high vacuum (10 ^-3 ~ 10 ^-9 torr) in the upper and lower parts of the evaporator.

Step 4 - Operate the cryo-pump to bring the temperature inside the evaporator to a very low temperature (-240 ~ 280 ℃), and quickly freeze moisture and other foreign substances in the evaporator to collect the collision to create a high vacuum. keep it in

Step 5 - When the high vacuum state is stably maintained, heat the heat source at 1,800 ~ 1900℃ while wetting, dispersing, and scattering are evenly achieved while inputting copper into the heat source, open the heat sink and apply the The operation of depositing copper may proceed.

For example, the heat source 4 uses any one of physical, chemical, induction heating or electron beam heating methods to melt the input copper and spray it on the surface of the nonwoven fabric, thereby depositing copper on the surface of the nonwoven fabric, It is possible to manufacture a copper-coated nonwoven fabric having a copper coating layer formed thereon.

Such a metallizing process allows copper metal to be easily deposited on the surface of the nonwoven fabric, thereby preventing copper from being easily desorbed from the surface of the nonwoven fabric, and at the same time, forming a nanometer-scale copper coating layer. In addition, the copper coating layer does not block the ventilation hole of the nonwoven fabric, but rather forms a copper coating layer on a part of the inner surface of the ventilation hole, so that even air passing through the ventilation hole can have antibacterial and antiviral properties.

Through this, the manufacturing method of the copper-coated nonwoven fabric according to an embodiment of the present invention can make the nonwoven fabric have semi-permanent antibacterial performance.

Next, the flame-retardant sponge 130 is a layer that is in contact with the skin adhesion surfaces such as the application of the composite insulation material, for example, the ceiling of a car, the wall of a machine room of a ship, and the inner and outer walls of a building. In the case of a known flame retardant sponge used for insulation It can be used without limitation. The first flame-retardant sponge 130 may be dried by impregnating the sponge with a flame-retardant solution. A sponge having a flame retardant performance has the advantage of preventing the propagation of a flame when a fire occurs, and is advantageous in expressing effects such as heat insulation, sound insulation, and sound insulation according to the porous structure of the sponge itself. The thickness of the flame-retardant sponge 130 may be 0.5 ~ 150 mm, but is not limited thereto.

Next, each of the first adhesive member 110 and the second adhesive member 120 may include a known adhesive, for example, a polyurethane-based, acrylic-based, polyester-based, or epoxy-based adhesive. However, in order to have excellent weather resistance, especially water resistance, to prevent cracking or weakening of adhesive strength due to frequent vibration, etc., and to minimize deterioration of adhesive performance due to heat, a polyurethane-based adhesive component may be preferably included.

As the polyurethane-based adhesive component, a known component known to be excellent in water resistance and heat resistance may be used without limitation. However, in order to significantly express adhesion durability in an environment where external forces such as frequent vibration are constantly applied in addition to water resistance and heat resistance, preferably 50 to 70% by weight of diisocyanate containing 1,6-hexamethylene diisocyanate, and weight 30 to 50% by weight of a polyol component containing polyethylene glycol having an average molecular weight of 1200 to 1500 may include a polyurethane-based adhesive composition comprising a urethane prepolymer and polypropylene oxide triol produced by reaction.

At this time, the diisocyanate component forming the urethane prepolymer is methylenediphenyl diisocyante (MDI), p-phenylene diisocyanate (PPDI), toluene diisocyanate in addition to 1,6-hexamethylene diisocyanate. Isocyanate (toluene diisocyanate, TDI), 1,5-naphthalene diisocyanate (NDI), isophoron diisocyanate (IPDI), cyclohexylmethane diisocyanate (H12MDI), xy It may further include any one or more of Xylene diisocyanate (XDI), Norbornane diisocyanate (NBDI), and Trimethyl hexamethylene diisocyanate (TMDI), and more improved at high temperature In terms of the expression of adhesive performance, it is preferable to further include 1,5-naphthalene diisocyanate, more preferably 1,6-hexamethylene diisocyanate and 1,5-naphthalene diisocyanate 1:0.2 to 0.4 It is good to include by weight ratio. If the weight of 1,5-naphthalene diisocyanate is less than 0.2 weight ratio, it may be difficult to achieve the desired improved adhesion at high temperature, and if the weight of 1,5-naphthalene diisocyanate is provided in excess of 0.4 weight ratio There may be a problem that the first adhesive member 110 and/or the second adhesive member 120 formed by curing through a polyurethane-based adhesive component may be broken in a situation in which frequent vibration is applied.

The polyol forming the urethane prepolymer may include polyethylene glycol having a weight average molecular weight of 1200 to 1500. When the weight average molecular weight is less than 1200, adhesion and water resistance may be reduced, and when the weight average molecular weight exceeds 1500, the coating film It may be difficult to achieve the object of the present invention, such as lowering properties and lowering adhesion durability in an environment with vibration.

According to an embodiment of the present invention, the polyol may further include a polyester polyol. Polyester polyol may weaken water resistance, but has the advantage of further improving adhesion durability in a harsh environment where frequent vibrations are applied. The polyester polyol may be a poly(tetramethylene ether) glycol (PTMG) polycondensation of an ester product in which an acid component containing terephthalic acid and a diol component containing ethylene glycol, neopentyl glycol and trimethylol propane are reacted. .

In addition to terephthalic acid, the acid component may further include a known polyvalent carboxylic acid or an aliphatic polyvalent carboxylic acid, but the aliphatic polyvalent carboxylic acid may reduce water resistance, so it is preferable to include only the aromatic polyvalent carboxylic acid. Considering the cost, only terephthalic acid is used. it is preferable

In addition, the diol component includes 15 to 25 mol% of neopentyl glycol and 5 to 10 mol% of trimethylol propane based on the total moles of the diol component, and may include ethylene glycol as the balance. When neopentyl glycol and trimethylol propane satisfy the above content range, improved heat resistance and adhesion are expressed, and when the content is out of the range, it is difficult to achieve the desired level of heat resistance and adhesion, or there is a risk that the water resistance may be significantly reduced.

The acid component and the diol component are esterified in a molar ratio of 1: 0.9 to 1.1 to form an ester compound, and the formed ester compound is poly(tetramethylene ether) glycol (PTMG) and polycondensed to form a polyester polyol can do. In this case, poly(tetramethylene ether) glycol is preferably included in an amount of 20 to 30% by weight based on the weight of the ester compound. If the poly (tetramethylene ether) glycol is included in an amount of less than 20% by weight, water resistance may decrease, and if it exceeds 30% by weight, the adhesive strength is reduced, and there is a fear that the adhesive layer implemented by frequent vibration may be broken.

The above-described polyester polyol may be included in an amount of 15 to 25 parts by weight based on 100 parts by weight of polyethylene glycol. can be beneficial to

The above-described diisocyanate component and polyol component may be included in the urethane prepolymer in an amount of 50 to 70% by weight and 30 to 50% by weight, respectively, and the number average molecular weight of the prepared urethane prepolymer may be 3500 to 6000, through which the present invention It may be more advantageous to achieve the purpose. The diisocyanate component and the polyol component can be prepared as a urethane prepolymer using a known polymerization method used for preparing a polyurethane-based adhesive, so the present invention relates to a specific method, conditions, and catalyst that can be added during polymerization. do not limit In addition, the method for producing a polyester polyol among polyols may also be performed by a conventional method for producing polyester, and accordingly, in the present invention, detailed descriptions of specific methods, conditions, and catalysts that may be added during polymerization are omitted.

On the other hand, the above-mentioned urethane prepolymer is crosslinked with polypropylene oxide triol to form a polyurethane-based adhesive component. In contrast to crosslinking with other types of polyols, for example, propylene glycol, etc., adhesion durability in an environment where vibration and heat are applied It may be advantageous to express the desired effect of the present invention, etc. At this time, the urethane prepolymer and the polypropylene oxide triol may be included in a weight ratio of 1: 0.7 to 1.0, which may be more advantageous in achieving the object of the present invention. On the other hand, the crosslinking reaction can be carried out for 10 minutes to 10 hours at a temperature of 30 to 100° C., and the temperature conditions and time can be appropriately adjusted through the addition of a curing accelerator that promotes the crosslinking reaction. The curing accelerator is, for example, potassium oleate, tetra-2-ethyl-hexyltitanate, tin(IV) chloride (Tin(IV) chloride), iron(III) chloride (Iron(III) Chloride), dibutyltin dilaurate (DBTL), zinc-naphthenate (Zn-naphthenate), lead-naphthenate (Pb-naphthenate), cobalt-naphthenate (Conaphthenate), calcium-naphthenate (Ca-naphthenate), triethylamine (TEA), N-N-diethylcyclohexylamine (N,N-diethylcyclohexylamine), 2,6-dimethylmorphorine (2,6-dimethylmorphorine), triethylenediamine ( DABCO, triethylene diamine), dimethylamino ethyl adipate, diethylethanolamine, N,N-dimethylbenzyl amin, DBU(1,8-Diazabicyclo[5.4] .0]undec-7-ene), DBN (1,5-Diazabicyclo[4.3.0]non-5-ene), etc. can be used one or two or more kinds. In this case, the curing accelerator may be included in an amount of 5 to 10% by weight based on the total weight of the above-described urethane prepolymer and polypropylene oxide triol.

Finally, the conductive sponge 140 may be used without limitation in the case of a known conductive sponge having conductivity, and may have a surface resistance of 10 ² to 10 ⁷ ohm. In addition, the conductive sponge 140 may be thicker than the above-described flame-retardant sponge. The conductive sponge 140 may have a thickness of 0.5 to 200 mm, but is not limited thereto.

In the above, the present invention has been mainly described with respect to the embodiment, but this is only an example and does not limit the embodiment of the present invention. It can be seen that various modifications and applications not exemplified above are possible without departing from the scope. For example, each component specifically shown in the embodiment of the present invention can be implemented by modification. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Preparation Example 1: Preparation of copper-coated non-woven fabric

(1) A polypropylene (PP) resin was prepared as a composition for fiber formation, and the PP resin was extruded and spun through a spinneret to prepare short fibers. After that, the short fibers are stacked to form a web, and then the short fibers forming the web are bonded to each other by using a thermal bonding method of irradiating high heat to form a nonwoven fabric having a basis weight of 70 g/m2. prepared.

(2) The prepared nonwoven fabric and copper were put into the vapor deposition machine shown in FIG. 3 to form a copper coating layer having a thickness of 25 nm on one surface of the nonwoven fabric, thereby manufacturing a copper coated nonwoven fabric.

Preparation Example 2: Preparation of copper-coated nonwoven fabric

A copper-coated nonwoven fabric was prepared in the same manner as in Example 1. However, unlike Example 1, the copper coating layer was formed to have a thickness of 10 nm on one surface of the nonwoven fabric, to finally prepare a copper coated nonwoven fabric.

Preparation Example 3: Preparation of copper-coated non-woven fabric

A copper-coated nonwoven fabric was prepared in the same manner as in Example 1. However, unlike Example 1, the copper coating layer was formed to a thickness of 50 nm on one surface of the nonwoven fabric, and finally a copper coated nonwoven fabric was prepared.

Comparative Preparation Example 1: Preparation of nonwoven fabric

As a composition for forming fibers, a mixture of polypropylene (PP) resin and copper (I) oxide (CuO) powder was prepared and extruded and spun through a spinneret to prepare short fibers. At this time, a mixture of 5 wt% of copper (I) (CuO) powder based on the weight of polypropylene (PP) resin was used as a mixture. After that, the short fibers are stacked to form a web, and then the short fibers forming the web are bonded to each other by using a thermal bonding method of irradiating high heat to form a nonwoven fabric having a basis weight of 70 g/m2. prepared.

Experimental Example 1: Measurement of physical properties of copper-coated non-woven fabric

The physical properties of the copper-coated nonwoven fabric as follows were measured and shown in Table 1 below.

(1) Measurement of antibacterial level

The antibacterial degree of each of the copper-coated non-woven fabric prepared in Preparation Examples 1 to 3 and the copper-coated non-woven fabric prepared in Comparative Preparation Example 1 was measured in accordance with KS K 0693:2016 test standards, respectively.

* 1. Test strain:

Test bacteria ① : Staphylococcus aureus ATCC 6538 (Staphylococcus aureus)

Test bacteria ②: Escherichia coli ATCC 25992 (E. coli)

Test bacterium ③: Salmonella typhimurium KCTC 1925 (typhoid rat)

2. Concentration of inoculum solution:

Test bacteria ① : 1.7 × 10 ⁴ CFU/mL

Test bacteria ② : 1.7 × 10 ⁴ CFU/mL

Test bacteria ③ : 1.7 × 10 ⁴ CFU/mL

3. Control piece: standard comedon

4. Nonionic surfactant: Tween 80, 0.05% of inoculum solution added

(2) Measurement of mold resistance (mildew resistance)

The mold resistance of each of the copper-coated nonwoven fabric prepared in Preparation Examples 1 to 3 and the copper-coated nonwoven fabric prepared in Comparative Preparation Example 1 was measured in accordance with ASTM G21-15 test standards, respectively.

* 1. Test strain used:

Aspergillus brasiliensis ATCC 9642

Chaetomium globosum ATCC 6205

Penicillium funiculosum ATCC 11797

Trichoderma virens ATCC 9645

Aureobasidium pullulans ATCC 15233

2. Culture conditions: (28 ~ 30)℃, 85% R.H. or higher, 28 days

3. Measurement grade:

Grade 0: No Growth

Grade 1: Grows less than 10% on copper-coated non-woven fabric

Grade 2: Growing at 10-30% or less on copper-coated non-woven fabric

3rd grade: 30 ~ 60% or less growth on copper-coated non-woven fabric

Grade 4: Grows over 60% on copper-coated non-woven fabric

(3) Measurement of airborne virus reduction rate

The airborne virus reduction rate of each of the copper-coated non-woven fabric prepared in Preparation Examples 1 to 3 and the copper-coated non-woven fabric prepared in Comparative Preparation Example 1 was measured by applying the KOUVA AS 02:2019 test standard mutatis mutandis.

* 1. Test method: KOUVA AS 02: 2019, air purifier

2. Virus: Phi-X174 (ATCC 13706-B1)

3. Temperature: (23 ± 2)℃

4. Humidity: (50 ± 5)% R.H.

5. Test chamber: 60 m ³

6. Test time: 30 minutes

7. Operating air volume: single mode

(4) Determination of copper desorption

The mass of copper emitted from each of the copper-coated nonwoven fabric prepared in Preparation Examples 1 to 3 and the copper-coated nonwoven fabric prepared in Comparative Preparation Example 1 was analyzed using an inductively coupled plasma mass spectrometer, respectively.

division preparation example
One preparation example
2 preparation example
3 Comparative preparation example
One Antibacterial degree (%) Test bacteria ① 99.9 99.9 99.9 98.7 Test bacteria ② 99.9 99.9 99.9 98.5 Test bacteria ③ 99.9 99.9 99.9 97.4 fungal resistance 0 rating 0 rating 0 rating 1st grade Airborne virus reduction rate (%) 93.3 91.2 93.4 85.7 Mass of copper released (mg) 0 5 0 4

As shown in Table 1, it was confirmed that the high-coated nonwoven fabric prepared in Preparation Example 1 had a relatively high airborne virus reduction rate and a small amount of copper emission compared to the high-coated nonwoven fabric prepared in Preparation Example 2.

In addition, the high-coated nonwoven fabric prepared in Preparation Example 1 did not have a significant difference in virus reduction rate compared to the high-coated nonwoven fabric prepared in Preparation Example 3, but it was confirmed that the economic feasibility was significantly reduced due to doubling of the thickness of the copper coating layer.

Preparation Example 4: Preparation of polyurethane-based adhesive composition

First, a urethane prepolymer was prepared. Specifically, in a three-necked flask 35 parts by weight of polyethylene glycol having a weight average molecular weight of 1200 to 1500 was added, and then nitrogen gas was added. Next, 65 parts by weight of 1,6-hexamethylene diisocyanate was added, heated to about 63° C., stirred, and maintained for about 5 hours. Thereafter, the reaction was terminated when the isocyanate group was measured to be about 17.5%, thereby obtaining a urethane prepolymer having a number average molecular weight of about 4000.

Then, the prepared urethane prepolymer and polypropylene oxide triol are mixed in a weight ratio of 1: 0.8, and 1% by weight of triethylamine and 1% by weight of dibutyl tin dilaurate (DBTL) are further mixed based on the total weight of these, MEK was added as a solvent and stirred to prepare a polyurethane-based adhesive composition.

Example 1: Preparation of composite insulation

A flame-retardant sponge having a thickness of 100 mm and a conductive sponge having a thickness of 100 mm and a surface resistance of 10 ³ ohms were prepared, respectively.

The polyurethane-based adhesive composition prepared in Preparation Example 4 was applied to one side of the prepared flame-retardant sponge, and the copper-coated nonwoven fabric in Preparation Example 1 was laminated on the surface on which the polyurethane-based adhesive composition prepared in Preparation Example 4 was applied. After that, the polyurethane-based adhesive composition prepared in Preparation Example 4 is applied to one surface of the copper-coated nonwoven fabric prepared in Preparation Example 1, and the conductive sponge prepared in Preparation Example 4 is laminated on the surface coated with the polyurethane-based adhesive composition. sieve was prepared.

The prepared laminate was cured at a temperature of 40° C. for 8 hours to prepare a composite insulation material in which a flame retardant sponge, a first adhesive member, a copper-coated nonwoven fabric, a second adhesive member, and a conductive sponge were sequentially stacked (of a copper-coated nonwoven fabric). The copper coating layer was manufactured so as to be in contact with the second adhesive member).

Experimental Example 2: Measurement of physical properties of composite insulation

The physical properties of the composite insulating material as follows were measured and shown in Table 2 below.

(1) water resistance

After cutting the composite insulation material prepared in Example 1 into specimens each having a width and length of 10 cm, a specimen was prepared. Thereafter, the prepared specimens were left for 1000 hours at a humidity of 80RH% and a temperature of 80°C. Thereafter, 10 experts evaluated the adhesion state of each layer of the specimens, and counted the number of specimens in which delamination or partial lifting occurred. The larger the counted number, the worse the water resistance.

(2) Adhesive durability evaluation

After the composite insulation material prepared in Example 1 was applied to the surface to which frequent vibration and heat were applied, adhesion durability was evaluated. Specifically, the composite insulation material prepared in Example 1 was cut into specimens of 10 cm in width and length, respectively, and 100 specimens were prepared. Then, the flame-retardant sponge of each specimen is attached to the iron plate through which the generated vibration can be well propagated through an adhesive, and the adhesive used in this case was the polyurethane-based adhesive composition prepared in Preparation Example 4 used in Examples. After that, a PTC element and a vibrator were installed in the center of the steel plate and vibration was applied for 1000 hours. At this time, the PTC device was heated to about 60 ℃. After evaluation, 10 experts evaluated the adhesion state of each layer of the specimens or the adhesion state of the iron plate and the composite insulation material, and the number of specimens in which delamination or partial lifting occurred, or the number of specimens in which delamination or partial lifting occurred in the iron plate was counted. The larger the counted number, the worse the adhesion durability in an environment with vibration and heat.

(3) Measurement of thermal conductivity

Based on the test method of KS L 9016: 2010, the thermal conductivity of the composite insulation material prepared in Example 1 was measured.

(4) Measurement of sound absorption characteristics

Based on the test standards of KS F 2805:2014, ASTM C 423-17, the sound absorption characteristics (NRC) of the composite insulation material prepared in Example 1 were measured.

(5) Flame propagation measurement

Based on the FTP Code Annex1 PART5 flame propagation test standards, the flame propagation properties of the composite insulation material prepared in Example 1 were measured.

(6) Whether flammable or toxic gas is generated

Based on the FTP Code Annex1 PART2 flammability and toxic gas test standards, the flammability and toxic gas generation of the composite insulation material prepared in Example 1 was measured.

division Example 1 water resistance 3 Adhesive durability 17 Thermal conductivity (W/m·K) 0.023 NRC 0.9 flame propagation CFE (Kw/m2) Critical heat flux during extinguishing 49.5 Qt (MJ) total heat released -0.1 Qp (Kw) Highest heat dissipation rate 0 Combustion Particles not produced Whether flammable or toxic gas is generated Average value of optical density (Dm) less than 0.1 CO (ppm) less than 60 HCl (ppm) 0 HF (ppm) 0 NOx (ppm) 0 HBr (ppm) 0 HCN (ppm) 0 SO ₂ (ppm) 0

As can be seen in Table 2, it was confirmed that the composite insulation material prepared in Example 1 had excellent thermal insulation performance, flame retardant performance, noise and vibration blocking performance, sound insulation performance, and durability that these effects could be maintained for a long period of time.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

1: Cooling drum
2: Unwinder
3: Rewinder
4: heat source
10: copper-coated non-woven fabric
30: non-woven fabric
31: non-woven fiber
33: ventilation hole
50, 70: copper coating layer
100: composite insulation material
110: first adhesive member
120: second adhesive member
130: flame retardant sponge
140: conductive sponge

Claims (5)

As a composite insulation material in which a flame retardant sponge, a first adhesive member, a copper-coated nonwoven fabric, a second adhesive member and a conductive sponge are sequentially stacked,
The conductive sponge has a surface resistance of 10 ² to 10 ⁷ ohm,
Each of the first adhesive member and the second adhesive member includes a polyurethane-based adhesive component,
The polyurethane-based adhesive component includes a urethane prepolymer and polypropylene oxide triol in a weight ratio of 1: 0.7 to 1.0,
The urethane prepolymer is produced by reacting 50 to 70% by weight of 1,6-hexamethylene diisocyanate and 30 to 50% by weight of polyethylene glycol having a weight average molecular weight of 1200 to 1500,
The copper-coated non-woven fabric is a non-woven fabric; and a copper coating layer formed on the surface of the nonwoven fabric; Including, wherein the copper coating layer of the copper-coated non-woven fabric is in contact with the second adhesive member, and the copper-coated non-woven fabric has a basis weight of 70 g/m 2 , wherein the copper coating layer has a thickness of 15 to 35 nm. composite insulation material.
According to claim 1,
The nonwoven fabric is a composite insulation material comprising at least one selected from polypropylene fibers, polyethylene phthalate fibers, polybutylene phthalate fibers, nylon fibers, wood pulp fibers and glass fibers.
According to claim 1,
The copper coating layer is a composite insulation material comprising at least one selected from copper, copper (I) oxide, copper (II) oxide, copper (I) sulfide, and copper (II) sulfide.
delete A first step of applying a first adhesive composition to one surface of the flame-retardant sponge, and laminating a copper-coated nonwoven fabric on the surface to which the first adhesive composition is applied;
A second step of preparing a laminate by applying a second adhesive composition to one surface of the copper-coated nonwoven fabric, and laminating a conductive sponge having a surface resistance of 10 ² to 10 ⁷ ohm on the surface to which the second adhesive composition is applied; and
a third step of curing the laminate to prepare a composite insulating material in which a flame retardant sponge, a first adhesive member, a copper-coated nonwoven fabric, a second adhesive member, and a conductive sponge are sequentially stacked; including,
Each of the first adhesive member and the second adhesive member includes a polyurethane-based adhesive component,
The polyurethane-based adhesive component includes a urethane prepolymer and polypropylene oxide triol in a weight ratio of 1: 0.7 to 1.0,
The urethane prepolymer is produced by reacting 50 to 70% by weight of 1,6-hexamethylene diisocyanate and 30 to 50% by weight of polyethylene glycol having a weight average molecular weight of 1200 to 1500,
The copper-coated non-woven fabric is prepared by (1) step of preparing a non-woven fabric; and (2) forming a copper coating layer on the surface of the nonwoven fabric through a deposition method to produce a copper coated nonwoven fabric; Including, wherein the copper-coated nonwoven fabric has a basis weight of 70 g/m 2 , the copper coating layer has a thickness of 15 to 35 nm.

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