KR100939994B1 - Method for producing a conductive fireproofing sheet and access-floor panel including the same - Google Patents

Abstract

PURPOSE: A manufacturing method of a conductive non-combustible sheet and a two-layered floor material including the sheet are provided to offer good conductivity and noncombustibility on a sheet by including a molded sheet which is processed with a hot high-pressure press. CONSTITUTION: A conductive non-combustible sheet(50) are manufactured by successively laminating a conductive non-woven sheet(10), a glass fiber sheet or a magnesium board(20), a conductive melamine faced sheet(30), and a protection sheet(40). The sheets are molded by a hot high-pressure press with the pressure of 50~80 kg/cm^2 in 125~130°C for 20 ~ 25 minutes. The glass fiber sheet is manufactured by dipping the glass fiber paper on phenol resin. A two-layered floor material includes a conductive combustible sheet, a particle board, and a conductive non-combustible sheet.

Description

Method for producing a conductive fireproofing sheet and access-floor panel including the same}

The present invention relates to a method for producing a conductive non-combustible sheet having an antistatic function and a double bottom material including the sheet, and more particularly, to a conductive melamine decorative plate including a kraft paper impregnated with a phenol resin containing carbon black and a non-combustible sheet. The present invention relates to a method for manufacturing a conductive non-combustible sheet manufactured by molding a glass fiber sheet or a magnesium board by a hot press and a double bottom material including the sheet.

In general, a floor finishing system that is applied in order not to expose floor wiring materials to an office building, a computer room or a clean room is called a "double floor material".

The current building and fire laws regulate the use of non-flammable, semi-non-flammable, and flame-retardant materials for the interior and interior materials used in the building.To prevent the spread of fire and to protect the life of the building, it is necessary to make fire prevention compartments. Fire doors require the installation of fire doors and are required by law to use materials that can withstand fire for 30 minutes or an hour.

The standards and performance test methods according to these legal regulations are based on the Korean Industrial Standard KS F2271 (Test method for flame retardant performance of building) for finishing and interior materials, flame retardant class 1 (non-flammable materials), flame retardant class 2 (semi-combustible materials), It is determined to satisfy the performance standards of flame retardant class 3 (flame retardant materials).

This is a regulation adopted by most countries around the world as well as Korea, but there may be some differences depending on the contents, but the regulations to use the one that meets the performance standards are almost the same. This is to prevent the spread of flames and to protect the safety of life and property from toxic gases generated during combustion in preparation for a fire.

Korean Laid-Open Patent Publication No. 2005-31198 discloses a non-flammable composition for a plate of a double bottom material including stone powder, a flame retardant resin for curing, an organic fiber or an inorganic fiber, and a fly ash or a bottom ash, and a method for manufacturing a double floor material using the same. Is disclosed.

In addition, as office automation and computerization become more popular, double flooring materials with conductive functions are used to protect programs from static electricity in computer control rooms, office spaces, air control rooms and banks.

Korean Laid-Open Patent Publication No. 2002-7750 discloses a conductive melamine decorative plate in which a melamine resin is mixed with a conductive material and an additive to impregnate and dried, and the registered utility model publication No. 20-0432873 is environmentally friendly, conductive properties and static electricity. Disclosed is a conductive double floor material having excellent prevention performance and a well-formed printed pattern.

As described above, although both the antistatic function and the flame retardant performance are required in the double floor material, there is no example in which a double floor material having both the antistatic function and the flame retardant performance has been developed.

Accordingly, the present inventors have endeavored to develop a double floor material having both antistatic and flame retardant functions. As a result, the conductive melamine decorative plate and the non-combustible glass fiber sheet or magnesium board are formed by hot pressing to form a hot conductive press. It was confirmed that the non-combustible double floor material can be produced and completed the present invention.

Accordingly, it is an object of the present invention to provide a method for producing a conductive non-combustible sheet having an antistatic function.

It is also an object of the present invention to provide a double bottom material comprising a conductive non-flammable sheet having an antistatic function.

In order to achieve the above object, in the present invention, the conductive non-woven fabric sheet, glass fiber sheet or magnesium board, conductive melamine decorative plate and protective paper sheet are stacked in order from 20 to 50 to 80 kg / cm 2 at a pressure of 125 to 130 ° C. Molded by hot (HOT) high pressure pressing for 25 minutes, the glass fiber sheet provides a conductive non-combustible sheet prepared by impregnating the glass fiber paper in the phenol resin.

In addition, as a double bottom material including the conductive non-combustible sheet, the conductive non-combustible sheet, the particle board and the conductive non-combustible sheet are sequentially stacked, and a ground rod penetrating the particle board so that upper and lower conductive non-combustible sheets are connected to the particle board. Provides perforated double floors.

As the double floor material including the conductive non-combustible sheet, the iron plate, the particle board and the conductive non-combustible sheet are sequentially stacked, and a ground rod penetrating the particle board is connected to the particle board so that the conductive non-combustible sheet on the upper side and the iron plate on the lower side are perforated. To provide double flooring.

In addition, the present invention after laminating the conductive non-woven fabric sheet, glass fiber sheet or magnesium board, conductive melamine decorative plate and protective paper sheet in order from below, hot for 20 to 25 minutes at a pressure of 50 ~ 80 kg / ㎠ at 125 ~ 130 ℃ High pressure pressing, the glass fiber sheet provides a method for producing a conductive non-combustible sheet prepared by impregnating the glass fiber paper in the phenol resin.

The conductive melamine decorative plate may include kraft paper impregnated with a phenol resin containing conductive carbon black; It provides a method for producing a conductive non-combustible sheet, characterized in that the conductive printed pattern paper impregnated with a melamine resin or a phenol resin.

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The double flooring material according to the present invention was excellent in both conductivity and non-combustibility by including a melamine decorative plate having excellent conductivity and a sheet made of a glass fiber sheet or magnesium board having excellent non-combustibility in a hot press.

The present invention after placing a conductive non-woven fabric sheet, glass fiber sheet or magnesium board, conductive melamine decorative plate and protective paper sheet in sequence from below to hot (HOT) for 20 to 25 minutes at a pressure of 50 ~ 80 kg / ㎠ at 125 ~ 130 ℃ It relates to a method for producing a conductive non-combustible sheet by high pressure pressing. At this time, when the molding temperature is lower than 125 ° C, the molding is not performed properly, and when it exceeds 130 ° C, carbon, which is a conductive material, burns. In addition, when the molding pressure is less than 50 kg / ㎠ the molding is not made properly, when the exceeding 80 kg / ㎠ broken or broken. If the molding time is less than 20 minutes, the molding is not performed properly, and if the molding time is more than 25 minutes, the sheet is broken or broken.

The conductive nonwoven sheet used in the present invention can be easily selected and used by those skilled in the art for commercial products or those commonly used in the field of the present invention. The conductive carbon black is inserted into a string and printed in a net or mesh form to realize excellent conductive performance. Usually, the unit basis weight of the nonwoven fabric is various, but in order to obtain the best electrically conductive effect, it is preferable that it is 40 g / m <2> -60 g / m <2>.

In the present invention, a commercially available glass fiber sheet or a magnesium board can be used as the nonflammable member. For example, a glass fiber sheet impregnated with a phenol resin (40%) may be used, but is not limited thereto.

The conductive melamine decorative plate used in the present invention can be easily selected and used by those skilled in the art for commercially available products or those commonly used in the field of the present invention, and more specifically, kraft impregnated with a phenol resin containing conductive carbon black. Paper and a conductive printed paper impregnated with a melamine resin or a phenol resin on the upper surface thereof can be used. For example, kraft paper impregnated with a phenolic resin containing conductive carbon black may include 47 to 53 wt% of kraft pulp and 45 to 48 wt% of phenol resin solids, wherein the content of conductive carbon black is 2 to 8 It is preferable that it is weight% and a unit basis weight is 160-250 g / m <2>. In addition, in the conductive printed pattern paper impregnated with a melamine resin or phenol resin, the melamine resin or phenol resin has a solid content of 55 to 60 wt%, and the unit basis weight of the conductive printed pattern paper impregnated with the melamine resin or phenol resin is 60 to It is preferable that it is 120 g / m <2>. The conductive printed pattern is connected to the conductive material in the form of a continuous line in the form of a net or mesh.

The protective sheet used in the present invention can be easily selected and used by those skilled in the art for commercially available products or those commonly used in the field of the present invention, in order to increase the wear resistance of the conductive melamine decorative plate and to protect the printed pattern layer. Transparent surface protective paper (transparent paper) is laminated on the conductive printed pattern paper. The transparent paper is a conductive material printed on the transparent paper using a printing cylinder manufactured by engraving into a net or mesh form, preferably impregnated with melamine resin, and the unit basis weight is preferably 20 to 40 g / m 2. .

The conductive non-flammable sheet of the present invention manufactured by the above method, as shown in Figure 1, the conductive nonwoven fabric sheet 10, the non-flammable member (glass fiber sheet or magnesium board) 20, the conductive melamine decorative plate 30 in order from the bottom ) And the protective sheet 40, but is not limited thereto. The conductive non-combustible sheet according to the present invention preferably has a total thickness of less than 1 mm.

The present invention also relates to a double bottom material comprising a conductive non-combustible sheet prepared by the above method.

In one embodiment of the present invention, the double floor according to the present invention is composed of a conductive non-combustible sheet, a particle board and a conductive non-combustible sheet in order from the bottom, as shown in Figure 2, so that the upper and lower conductive non-combustible sheet is connected A plurality of ground rods penetrating the particle board are bored in the particle board.

Double flooring according to the present invention can be produced by a conventional method well known in the art, the ground rod is preferably less than 6 mm in diameter, using a copper pipe of 35 to 38 mm in length, but is not limited thereto. .

The particle board can be easily selected and used by those skilled in the art for commercially available products or those commonly used in the field of the present invention. Here, the particle board forms the basis of the interior surface material and can maintain its shape and strength. The thickness of the particle board can be variously controlled, and the strength and smoothness of the particle board together with the material adhered to both sides is maintained. In consideration of the side, it may be preferable to have a thickness of about 20 ~ 35 mm, but this is not particularly limited.

In another embodiment of the present invention, the double floor according to the present invention, as shown in Figure 3, consisting of an iron plate, a particle board and a conductive non-combustible sheet of 0.10 ~ 0.16 mm thickness in order from the bottom, the conductive non-combustible sheet of the upper A plurality of ground rods penetrating the particle board are drilled in the particle board so that the lower and iron plates are connected to each other.

Hereinafter, the content of the present invention will be described in more detail through examples and test examples. These examples are provided only for understanding the contents of the present invention, and the scope of the present invention is not limited to these examples, and modifications, substitutions, and insertions commonly known in the art may be performed. This is also included in the scope of the present invention.

Example 1 Manufacture of Conductive Nonflammable Sheet

Net-shaped conductive nonwoven sheet 10 (meltec, carbon treated nonwoven fabric), glass fiber sheet or magnesium board 20 (fiber Korea, glass fiber), conductive melamine decorative plate 30 (meltec, Inc.) Melamine cosmetic sheet (HPL)) and the protective paper sheet 40 are sequentially laminated, and then thermally cured by hot (HOT) high pressure press for 20 to 25 minutes at a pressure of 50 to 80 kg / cm2 at 125 to 130 ° C. The conductive non-combustible sheet 50 of Example 1 was prepared.

Comparative Example 1

Net-shaped conductive nonwoven sheet 10 (meltec, carbon treated nonwoven fabric), glass fiber sheet or magnesium board 20 (fiber Korea, glass fiber), conductive melamine decorative plate 30 (meltec, Inc.) Melamine cosmetic sheet (HPL)) and the protective paper sheet 40 were sequentially laminated and thermally cured by hot (HOT) high pressure press for 25 minutes at a pressure of 70 kg / cm 2 at 135 ° C. It could not be manufactured.

Comparative Example 2

Net-shaped conductive nonwoven sheet 10 (meltec, carbon treated nonwoven fabric), glass fiber sheet or magnesium board 20 (fiber Korea, glass fiber), conductive melamine decorative plate 30 (meltec, Inc.) Melamine cosmetic sheet (HPL)) and the protective paper sheet 40 were sequentially laminated, and then thermally cured by hot (HOT) high pressure press for 25 minutes at a pressure of 70 kg / cm 2 at 120 ° C., but molding was not performed properly.

Comparative Example 3

Net-shaped conductive nonwoven fabric sheet 10 (Meltec Co., Ltd., carbon treated nonwoven fabric), glass fiber sheet or magnesium board 20 (Fiber Korea Co., Ltd., Glass Fiber Co., Ltd.), conductive melamine decorative plate 30 (Meltec Co., Ltd.) After laminating the melamine cosmetic sheet (HPL) and the protective paper sheet 40 in sequence, the thermosetting was performed by hot (HOT) high pressure press at a pressure of 48 kg / cm 2 at 125 ° C. for 25 minutes, but molding was not performed properly.

[Comparative Example 4]

Net-shaped conductive nonwoven sheet 10 (meltec, carbon treated nonwoven fabric), glass fiber sheet or magnesium board 20 (fiber Korea, glass fiber), conductive melamine decorative plate 30 (meltec, Inc.) Melamine cosmetic sheet (HPL)) and protective paper sheet 40 were sequentially laminated and thermally cured by hot (HOT) high pressure press for 25 minutes at a pressure of 85 kg / cm 2 at 125 ° C, but the sheet was not finished and was broken or broken. .

[Comparative Example 5]

Net-shaped conductive nonwoven sheet 10 (meltec, carbon treated nonwoven fabric), glass fiber sheet or magnesium board 20 (fiber Korea, glass fiber), conductive melamine decorative plate 30 (meltec, Inc.) Melamine cosmetic sheet (HPL)) and the protective paper sheet 40 were sequentially laminated, and then thermally cured by hot (HOT) high pressure press for 18 minutes at a pressure of 70 kg / cm 2 at 125 ° C, but molding was not performed properly.

Comparative Example 6

Net-shaped conductive nonwoven fabric sheet 10 (meltec, carbon treated nonwoven fabric), glass fiber sheet or magnesium board 20 (fiber Korea, glass fiber), conductive melamine decorative board 30 (meltech Co., Ltd.) , Laminated with melamine cosmetic sheet (HPL) and protective paper sheet 40, and then thermally cured by hot (HOT) high pressure press for 30 minutes at a pressure of 70 kg / ㎠ at 125 ℃, the sheet is not finished broken or cracked lost.

Example 2 Preparation of Double Flooring

A copper pipe 61 having a diameter of 4 mm and a length of 35 mm was perforated to penetrate the particle board 60.

After laminating the conductive non-combustible sheet 50 of Example 1, the particle board 60 in which the copper pipe 61 was perforated, and the conductive non-combustible sheet 50 of Example 1, in turn, a pressure of 35 kg / cm 2 at room temperature 15 minutes by hot (HOT) high pressure pressing to complete the double flooring material 70 of Example 2.

Example 3 Preparation of Double Flooring

A copper pipe 61 having a diameter of 4 mm and a length of 35 mm was perforated to penetrate the particle board 60.

After laminating the iron plate 80, the MDF particle board 60 in which the copper pipe 61 was drilled from the bottom, and the conductive non-combustible sheet 50 of Example 1 were sequentially stacked, hot for 15 minutes at a pressure of 35 kg / cm 2 at room temperature. High pressure pressing to complete the double bottom material 90 of Example 3.

[Test Example 1]

Evaluation of the heat release test, antistatic, water resistance and wear resistance of the double flooring manufactured in Example 1 and commercially available double flooring was performed as follows, and the results are shown in Table 1 below.

Evaluation item Conductive Nonflammable Sheet of Example 1 heat emission Total released calories less than 8 MJ / ㎡ 5.02 Within 10 seconds the maximum heat release rate exceeds 200 kw / ㎡ 0.0 sec There should be no harmful cracks, holes, or melting in fire prevention through the test body. clear Antistatic Resistance: should be 10 ⁴ ~ 10 ⁶ 10 ⁴ to 10 ⁶ Water resistance No problem to use anywhere in the room without change or change of surface caused by moisture clear Abrasion Resistance (Scratch Resistance) Surface strength 8H equivalent strength, resistant to scratches and impact Good

As shown in the results of Table 1, the conductive non-combustible sheet according to the present invention was confirmed to be excellent in water resistance and wear resistance as well as antistatic and flame retardant effect.

1 is a cross-sectional view of a conductive non-combustible sheet prepared in Example 1 according to the present invention.

Figure 2 is a cross-sectional view of the double floor material prepared in Example 3 according to the present invention.

3 is a cross-sectional view of the double floor covering prepared in Example 4 according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: conductive nonwoven sheet 20: nonflammable member

30: conductive melamine decorative plate 40: protective sheet

50: conductive non-flammable sheet 60: particle board

61: copper pipe (ground rod) 70: double bottom

80: iron plate 90: double floor

Claims (6)

Conductive nonwoven fabric sheet, glass fiber sheet or magnesium board, conductive melamine decorative plate and protective paper sheet are sequentially stacked, and formed by hot pressing at a pressure of 50 to 80 kg / ㎠ at 125 to 130 ° C for 20 to 25 minutes. , The glass fiber sheet is a conductive non-combustible sheet, characterized in that prepared by impregnating the glass fiber paper phenol resin. A double bottom material comprising the conductive non-combustible sheet according to claim 1, The conductive non-combustible sheet, the particle board, and the conductive non-combustible sheet are sequentially stacked, and a double bottom material having a ground rod penetrating through the particle board to connect the upper and lower conductive non-combustible sheets to the particle board. A double bottom material comprising the conductive non-combustible sheet according to claim 1, An iron plate, a particle board, and a conductive non-combustible sheet are sequentially stacked, and a double bottom material having a ground rod penetrating through the particle board to connect the upper conductive non-combustible sheet and the lower iron plate to the particle board. Laminating conductive non-woven fabric sheet, glass fiber sheet or magnesium board, conductive melamine decorative board and protective paper sheet in order from the bottom, and hot pressing high pressure for 20-25 minutes at 125 ~ 130 ℃ with 50 ~ 80 kg / ㎠ pressure. , The glass fiber sheet is a method of producing a conductive non-combustible sheet, characterized in that prepared by impregnating the glass fiber paper phenol resin. The method of claim 4, wherein the conductive melamine decorative plate is kraft paper impregnated with a phenol resin containing conductive carbon black; A method for producing a conductive non-combustible sheet, characterized in that the conductive printed pattern paper impregnated with a melamine resin or a phenol resin is laminated. delete

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