KR20100024123A - Sheet of wall papers having moisture absorption - Google Patents

Abstract

PURPOSE: Wallpaper on which moisture is easily adsorbed is provided to prevent discoloration or molds on the wallpaper, and to prevent a gap between the wallpaper and wall due to the moisture by the moisture being absorbed on the wallpaper. CONSTITUTION: Wallpaper on which moisture is easily adsorbed comprises inner paper improving a look of the wallpaper by printing a specific pattern and inner paper adhered on an inner side of outer paper. The inner paper is made with super absorbent resin and manufactured by electrospinning. The super absorbent resin is one component selected among polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin and chitosan resin. The average diameter of the microfiber is 30~1000 nm. The average weight of the microfiber is 0.5~10 g / m.

Description

Wallpaper of excellent moisture absorption {Sheet of wall papers having moisture absorption}

The present invention relates to a wallpaper, and more particularly to a wallpaper having excellent moisture absorption performance by adhering a microfiber aggregate made of a superabsorbent resin to an inner surface of a wallpaper which is commonly used to improve absorption of moisture supplied from the outside. will be.

Recently, with the improvement of living standards, interest in improving the living environment is increasing. The concept is that home is not only a normal resting place but also a comfortable and comfortable place. Along with this trend, interior products are also being upgraded. A simple example is wallpaper, which used to function only as a material for paving walls, but modern wallpaper is not only a means for paving walls but also seeks aesthetics and functionality.

For this reason, wallpaper having various functions such as fabric wallpaper, wallpaper with flame retardant function, wallpaper emitting far infrared rays, and wallpaper with antibacterial and deodorant function have been manufactured.

However, conventionally developed and used wallpaper has a very weak characteristics in common. Due to the moisture coming from the wall surface or the moisture flowing from the humid environment such as the rainy season, the wallpaper may not be stably attached to the wall surface and the floating phenomenon occurs. Not only that, the part that absorbs moisture is discolored and damages the aesthetic appearance, and mold is generated on the part, threatening human health.

In order to solve this problem, various dehumidifiers are installed, but once the dehumidifier absorbs moisture, it cannot be reused and takes up a separate space.

The present invention has been made to solve the above problems of the prior art, by attaching a light weight microfiber aggregate made of a superabsorbent polymer that can absorb moisture introduced from the outside to the inner surface of a conventionally used wallpaper The purpose of the present invention is not only to prevent the wallpaper from being lifted from the wall due to moisture, but also to provide a wallpaper having excellent moisture adsorption performance to prevent discoloration or mold generation of the wallpaper.

The wallpaper excellent in moisture absorption performance according to the present invention for solving the above problems is the outer surface to give a sense of aesthetic by printing a specific pattern, the polyacrylamide, polyacrylic acid, polymethacrylic acid, adhered to the inner surface of the outer surface, Consists of a superabsorbent polymer selected from polyethylene oxide, polyvinyl alcohol, gelatin, chitosan resin and made of microfiber aggregates produced by electrospinning, wherein the microfiber aggregates have an average diameter of 30 ~ It is 1000 nm, the average diameter of the pores is 10-1000 nm, and the average weight is 0.5-10 g / m <2>.

Wallpaper having excellent moisture adsorption performance of the present invention configured as described above is attached to the microfiber aggregate using a superabsorbent resin on the inner surface of the outer surface to absorb moisture flowing from the outside, so that the phenomenon of lifting, discoloration, mold occurrence of the wallpaper There is an advantage that can be suppressed.

In addition, since the microfiber aggregate is manufactured by the electrospinning method, it is possible not only to manufacture a wallpaper having excellent moisture adsorption performance without changing the weight and shape, but also to have a large surface area of the microfiber, so that it can quickly absorb a large amount of moisture. .

Hereinafter, with reference to the accompanying drawings an embodiment of a wallpaper having excellent water adsorption performance according to the present invention will be described in detail.

1 is a schematic diagram of an electrospinning apparatus used when manufacturing a wallpaper having excellent water adsorption performance according to the present invention, Figure 2 is an electron microscope of an ultrafine fiber assembly constituting a wallpaper of excellent water adsorption performance according to the present invention It is a photograph.

The wallpaper having excellent moisture adsorption performance according to the present invention is composed of the outer surface, and adhered to the inner surface of the outer surface and attached to the wall surface.

The outer paper gives a sense of aesthetic by printing a specific pattern.

It consists of the ultrafine fiber aggregates made of the superabsorbent polymer and produced by electrospinning.

The superabsorbent polymer is made of any one selected from polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, chitosan resin. In other words, the super absorbent polymer is a material that can easily absorb a large amount of moisture. Typically absorbs moisture up to 1 to 20 times its own weight and has the advantage that it can be reused because the moisture escapes during drying.

In addition, the microfiber aggregate is composed of a plurality of microfibers are combined, the microfibers have an average diameter of 30 ~ 1000nm, the average diameter of the pores formed between the microfibers, that is, the average diameter of the pores formed between the microfibers It is 10-1000 nm, and the average weight of a microfiber aggregate is 0.5-10 g / m <2>. The reason for forming the ultrafine fibers is that when the fibers themselves become microscopic, the surface area thereof becomes wider and many voids are formed between the microfine fibers, and the surface area and the pores facilitate the adsorption of moisture.

Electrospinning is a fiber manufacturing method that can produce ultra-fine fibers (also called 'nano fibers') having a diameter of several tens to hundreds of nm. The electrospinning method applies a high voltage of several thousand to tens of thousands of volts to the polymer solution to apply a tangential vector force exceeding the surface tension of the solvent to the polymer solution to form a fine polymer jet from the polymer solution. It is a method of spraying fine fibers of tens to hundreds of nanometers thick toward an object with opposite charge.

By using the electrospinning method, it is possible to produce a microfiber aggregate as shown in FIG. 2 consisting of nanofibers having a thickness of several tens to hundreds of nanometers from a polymer solution, and by using this, a high-functional garment, an ultra-precision filter, and a material for cell culture ( high performance products such as scaffold).

Here, the electrospinning method will be described in more detail with reference to FIG. 1.

The polymer solution stored in the polymer solution tank 1 is supplied to the nozzle 3 through the polymer solution supply pump 2. At this time, the nozzle 3 is subjected to a high voltage by the voltage transfer rod 5 electrically connected to the voltage generator 6, the collector 4 is a voltage transfer rod electrically connected to the voltage generator 6 ( 5), a high voltage with opposite charge to the nozzle 3 is applied.

The polymer solution supplied to the nozzle 3 is electrospun toward the collector 4 and volatilized into nanofibers, and the volatilized nanofibers are laminated on the collector 4 to form an ultrafine fiber assembly, that is, a nanofiber web. Manufacture. Specifically, the polymer solution supplied to the nozzle 3 has a higher stress in the normal vector direction than the surface tension of the polymer solution due to the high voltage applied to the nozzle 3 and the collector 4 to form a polymer jet. Done. The polymer jet is directed toward the collector 4 with the opposite charge and is maintained in the jet state from the nozzle 3 to a certain period, after which it is converted into nanofibers and volatilized and accumulated on the collector 4. .

On the other hand, the polymer solution is prepared by dissolving the super absorbent polymer in a specific solvent, but there is no limitation in the type of solvent. The concentration of the polymer solution can range from as low as 1% or less to as high as 50% or less.

In addition, a fibrous base, a nonwoven fabric, or a film may be positioned on the collector 4 and positioned on an upper surface, a lower surface, or a horizontal surface of the nozzle 3 to move at a constant linear velocity.

In addition, in the present invention, a method of bonding the polymer solution in which the superabsorbent polymer is dissolved to the outer surface of the microfiber aggregate and forming the aggregate by the electrospinning method and directly bonding the inner surface of the outer shell may be used. It is also possible to use a method of forming a microfiber aggregate and bonding it to the inside surface of the wallpaper using a conventional adhesive. Although the bonding method is not particularly limited, it is easy to directly bond the inside surface of the wallpaper while forming an aggregate by the electrospinning method, and there is an advantage of low manufacturing cost.

The excellent water adsorption performance according to the present invention configured as described above was prepared in the above various conditions and compared with the comparative example of the wallpaper produced in the range that does not correspond to the conditions and its performance.

Example 1

Polyacrylamide was dissolved in dimethylformamide (DMF) to have a concentration of 10% to prepare a polyacrylamide solution at 25 ° C. and used as a polymer solution.

The polyacrylamide solution stored in the polymer solution tank 1 is supplied to the nozzle 3 through the polymer solution supply pump 2 using the electrospinning device shown in FIG. 1 and positioned above the nozzle 3. After spraying toward the collector 4 to volatilize the microfibers (or nanofibers), the volatilized microfibers were laminated on the collector 4 to prepare a polyacrylamide microfiber aggregate. At this time, the inside surface of the wallpaper (commercially referred to as 'outside') on the collector 4 surface is directed downward so that the volatilized microfibers are directly stacked on the inside surface of the wallpaper to be a microfiber aggregate. do.

At this time, a voltage of 55,000 volts was applied to the nozzle 3 and the collector 4 by using a voltage generator 6 connected to an AC power source of 220 volts and 60 Hz. In addition, the space | interval of the nozzle 3 and the collector 4 was set to 20 cm.

Examples 2-4

It was prepared under the same conditions as in Example 1 except that the polymer and solvent type, the collector, and the voltage applied to the polymer solution and the interval between the nozzle and the collector were changed as shown in [Table 1].

TABLE 1

division Polymer type menstruum Voltage (volts) Nozzle-collector spacing (cm) Example 1 Polyacrylamide Dimethylformamide 55,000 20 Example 2 Polyacrylic acid Dimethylformamide 45,000 25 Example 3 Polyvinyl alcohol water 60,000 35 Example 4 Chitosan water 65,000 30

Example 5

Prepared under the same conditions as in Example 1, except that the microfiber aggregate was formed by the electrospinning method and attached to the inner surface of the outer surface using a conventional adhesive.

Comparative Example 1

Staple fibers composed of polyacrylamide are produced in a nonwoven sheet state using the needle punching method. The nonwoven fabric sheet thus produced is bonded to an inner surface of a commercially available wallpaper using an adhesive.

Comparative Example 2

The polyacrylamide powder was dissolved in dimethylformamide (DMF) to have a concentration of 10% to prepare a polyacrylamide solution at 25 ° C. and used as a polymer solution. The polymer solution thus prepared is applied to the inner surface of a commercially available wallpaper and then evenly applied.

TABLE 2

division Fiber Average Diameter (nm) Size of voids (nm) Average weight (g / ㎡) Water absorption Example 1 440 120 5.0 12 Example 2 320 475 5.7 9 Example 3 215 370 3.4 11 Example 4 530 240 2.9 8.5 Example 5 440 620 6.2 10 Comparative Example 1 2040 1400 50.1 7 Comparative Example 2 - 110 25.4 9

Here, the properties of Table 2 were evaluated by the following method.

(1) Fiber average diameter and pore average size of microfiber aggregate

The average diameter of the microfibers constituting the microfiber aggregate was magnified 5,000 times using a scanning electron microscope for any of five places of the microfiber aggregate, and the diameter of the fibers was directly measured. The diameter is measured and averaged.

The average size of the pores of the microfiber aggregate is measured according to ASTM F316-03 (Standard Test Methods for Pore Size Characteristics of Membrane Filters by Bubble Point and Mean Flow Pore Test).

(2) Weight per unit area of microfiber aggregate

The weight per unit area of the microfiber aggregate is evaluated according to JIS L 1096 (Testing methods for woven fabrics).

(3) Water adsorption amount of microfiber aggregate

The water adsorption amount of the microfiber aggregate was measured by measuring the weight (w1) of the sample of the microfiber aggregate cut into a size of 10 cm and 10 cm, and then 30 ml of water in a closed container of 50 cm in width, length, and height. It is put together with and the weight (w2) of the microfiber aggregate after standing for 24 hours is measured.

The water adsorption amount is calculated by the following equation.

Water absorption = (w2-w1) / w1

As can be seen from the above [Table 2], the microfiber aggregates of Examples 1 to 5 can be seen that the water adsorption amount is 8.5 to 12, which is higher than 7 or 9 of Comparative Examples 1,2. That is, it means that the microfiber aggregate according to the present invention absorbs a lot of moisture, and it is possible to prevent the wallpaper from being easily lifted or discolored from the wall even when a lot of moisture is supplied from the outside.

However, Comparative Example 2 has a relatively high moisture adsorption amount of 9, but in this case, the weight is 25.4 (g / ㎡) is quite heavy, it can be inferred that the transport or dosing process is not easy.

1 is a schematic view of an electrospinning apparatus used when producing a wallpaper having excellent moisture adsorption performance according to the present invention.

Figure 2 is an electron micrograph of the microfiber aggregate constituting the wallpaper of the excellent water adsorption performance according to the present invention.

<Explanation of symbols on main parts of the drawings>

1: Polymer solution tank 2: Polymer solution supply pump

3: nozzle 4: collector

5: voltage transfer rod 6: voltage generator

Claims (5)

It is composed of a certain pattern is printed on the outer surface to give a sense of aesthetic, and adhered to the inner surface of the outer surface, The wallpaper having excellent moisture adsorption performance, characterized in that the fine-fiber aggregate made of the superabsorbent resin and produced by the electrospinning method. The method according to claim 1, The superabsorbent polymer is excellent in water absorption performance, characterized in that made of any one selected from polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, chitosan resin. The method according to claim 1, The microfiber has excellent moisture adsorption performance, characterized in that the average diameter of 30 ~ 1000nm. The method according to claim 1 or 3, The microfiber aggregate has excellent moisture adsorption performance, characterized in that the average diameter of the pores of 10 ~ 1000nm. The method according to claim 4, The microfiber aggregate has an excellent water adsorption performance, characterized in that the average weight is 0.5 ~ 10g / ㎡.

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