JP2592862Y2 - Heat resistant antistatic sheet - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic work sheet laid under electronic components and precision equipment when soldering and repairing electronic components and precision equipment on site.

[0002]

2. Description of the Related Art Conventionally, when an electronic component or a precision device breaks down, a large amount of an antistatic agent is added when repairing or inspecting such a device in order to prevent a malfunction such as a malfunction due to static electricity. Repair and inspection work was performed by laying a plastic synthetic resin sheet under these devices.

[0003]

However, in the case of a conventional antistatic thermoplastic synthetic resin sheet, when soldering is repaired, the molten solder dropped by mistake melts through the sheet and burns to a desk or a work table. Scratches, etc., and the adhesion of the melted resin damage and contaminate the desk and the work table, which is not preferable.

Further, it is desired that the sheet has an electrical performance of 10 ⁸ Ω or less due to the improvement of the performance of electronic parts and precision equipment. However, the sheet to which an antistatic agent is added has a volume resistance of 10 ⁸ Ω or less. It is difficult to obtain the performance of the above, and since a large amount of the antistatic agent is added, the antistatic agent migrates to the surface and adheres to the device to cause contamination. Although the volume resistivity can be set low at cost, it is not preferable for work because it is limited to black, and because of the addition of a large amount of carbon black, it is susceptible to abrasion, and carbon particles are removed from the surface and float,
Undesirably, it adheres to equipment and causes contamination.

[0005] Further, a laminate comprising a colored antistatic sheet layer having an antistatic agent added to the surface layer and a conductive sheet layer having carbon black added to the back surface has good electrical performance, but the above-mentioned laminate is required during the soldering operation. It is not preferable because it causes problems.

Therefore, coloring is possible and the volume resistance is 10 ^8.
There is a demand for a work sheet which is excellent in electrical performance of Ω or less and does not penetrate the sheet by molten solder dropped in the soldering work.

[0007]

According to the present invention, a heat-resistant woven fabric is laminated on a colored antistatic sheet, a conductive sheet is formed on the heat-resistant woven cloth, and a colored antistatic sheet is further formed on the conductive sheet. Solving the above problems by laminating the conductive sheets, and providing an antistatic sheet having excellent electrical performance, design properties, and heat resistance, the means is to add an antistatic agent and an antistatic agent. A heat-resistant woven fabric is laminated on a colored antistatic thermoplastic synthetic resin sheet having a volume resistance of 10 ⁸ to 10 ¹¹ Ω, and the colored antistatic material is pierced through the texture on the heat-resistant woven fabric. A conductive material such as conductive carbon black, conductive metal powder, conductive carbon fiber, or conductive metal fiber has a volume resistance of 10 ² to 10 ⁵ Ω so as to be conductive with the conductive thermoplastic synthetic resin sheet. Laminated conductive thermoplastic synthetic resin sheets Was further laminated colored antistatic thermoplastic synthetic resin sheet volume resistivity of adding an antistatic agent and the antistatic plasticizer conductive thermoplastic synthetic resin sheet has a value of 10 ⁸ to 10 ¹¹ Omega 10 ⁵ ~
The structure has a value of 10 ⁸ Ω, and the same volume resistance can be obtained from both sides.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the structure of the heat-resistant antistatic sheet of the present invention. Reference numerals 1 and 4 denote a colored antistatic thermoplastic synthetic resin sheet layer containing an antistatic agent and an antistatic plasticizer.
Reference numeral 2 denotes a heat-resistant woven fabric, and reference numeral 3 denotes a conductive thermoplastic synthetic resin sheet layer.

FIG. 2 shows the structure of the flame-retardant heat-resistant antistatic sheet of the present invention, 1 is a colored antistatic thermoplastic synthetic resin sheet layer, 2 is a heat-resistant woven cloth, and 3 is a conductive sheet. The thermoplastic synthetic resin sheet layer 5 is a colored flame-retardant antistatic thermoplastic synthetic resin sheet layer to which an antistatic agent and an antistatic plasticizer are added.

The colored antistatic thermoplastic synthetic resin sheet layers 1, 4, and 5 are made of vinyl chloride resin such as vinyl chloride resin, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-urethane copolymer resin, polyethylene, polypropylene, or the like. An olefin resin such as an ethylene-vinyl acetate copolymer resin or an ethylene-acrylate copolymer resin, a soft thermoplastic synthetic resin such as a urethane resin, particularly preferably a vinyl chloride resin, and a volume resistance to these synthetic resins. Rate 1
0 ⁸ to 10 ¹¹ Omega values obtained as nonionic, cationic antistatic agent, and dibutoxy ethylene phthalate, butyl diglycol adipate, Purasaiza M-
An antistatic plasticizer such as 300L (Kyowa Hakko) and AM903 (Sekisui Chemical) is added, and a general-purpose plasticizer such as dioctyl phthalate and dinonyl phthalate, a stabilizer, a coloring agent, and the like are further added. To make it flame-retardant, add a phosphate plasticizer such as tricresyl phosphate and trixylene phosphate, a hydroxide such as aluminum hydroxide or magnesium hydroxide, or a flame retardant such as antimony oxide, and calender molding 0.1-1mm thick by extrusion molding
It is made into a sheet.

The conductive thermoplastic resin sheet layer 3 has a volume resistivity of 10 ² to 10 ⁵ Ω with respect to the above-mentioned thermoplastic synthetic resin.
cm or powder such as carbon, nickel, stainless steel, aluminum or short fiber or tin oxide,
A single or two or more conductive materials such as inorganic particles surface-treated with zinc oxide, nickel or the like are added in an amount of about 5 to 50%, and a general-purpose plasticizer and a stabilizer are added.
It is made into a sheet with a thickness of about 1 mm.

[0013] The heat-resistant woven fabric 2 is made of a polyester fiber,
A woven fabric composed of aromatic polyamide fiber, glass fiber, and carbon fiber, woven and plain woven with these yarns alone or as a mixture, having a density (books / inch) of 8 to 25 and a thickness of 0 to 25.
2 to 0.5 mm is preferred. When the density is 7 or less, it is not preferable that the molten solder penetrates the sheet, and when the density is 26 or more, the bite of the sheet at the time of lamination is poor and the conductive sheet layer is difficult to join with the lower antistatic layer. In this case, it is necessary to laminate the woven fabric after applying a conductive adhesive or conductive vinyl chloride paste to the woven fabric.

As described above, the present invention provides a heat-resistant fiber 2, a conductive sheet 3, an antistatic agent and an antistatic plasticizer on a colored antistatic sheet 1 to which an antistatic agent and an antistatic plasticizer are added. The colored antistatic sheet 4 or 5 to which the above is added is laminated, and then heat-pressed at a temperature of 180 to 200 ° C. to be laminated and integrated.

Next, a specific embodiment of the present invention will be described. Example 1 (compounding colored antistatic sheet) 100 parts by weight of vinyl chloride resin 25 parts by weight of dioctyl phthalate 20 parts by weight of dibutoxyethyl phthalate 1.5 parts by weight of beryllium stearate 1.5 parts by weight of zinc stearate Polyoxyethylene alkyl ether 1.0 parts by weight Calcium carbonate 20 parts by weight

The vinyl chloride compound having the above composition is mixed and stirred at room temperature for 30 seconds using a Henschel mixer. When sufficiently mixed, 1 part by weight of titanium oxide and 3 parts by weight of phthalocyanine blue were added as colorants and kneaded for 1 minute with a Banbury mixer heated to 150 ° C. to gel the compound, and then 180 ° C. Was rolled into a 0.45 mm-thick blue sheet by a calendering machine adjusted to the above temperature.

(Containing conductive sheet) Vinyl chloride resin 100 parts by weight Dioctyl phthalate 60 parts by weight Lead stearate 2 parts by weight Barium stearate 0.5 parts by weight Dibasic stearate 0.3 parts by weight Keshichen black 30 parts by weight Parts calcium carbonate 20 parts by weight

The vinyl chloride compound having the above composition is mixed and stirred at room temperature for 30 seconds using a Henschel mixer. After mixing sufficiently, knead the mixture for 2 minutes with a Banbury mixer heated to 150 ° C. to gel the compound,
0.4mm with a calendering machine adjusted to a temperature of ℃
Rolled into a black sheet of thickness.

On the colored antistatic sheet obtained as described above, a plain woven cloth, a conductive sheet, and a colored antistatic sheet having a yarn density of (polyester) of 19 and a thickness of 0.33 with a polyester fiber as the original yarn. Were sequentially heated at 190 ° C. while embossing to obtain a 1.5 mm blue heat-resistant antistatic sheet.

The electrical performance of the sheet is such that the volume resistance is 2.0
× 10 ⁶ Ω, surface resistance 3.0 × 10 ⁷ Ω, charged voltage 0
V showed excellent performance, and molten solder was dropped on the sheet, but stopped at the heat-resistant fiber and did not penetrate.

Example 2 (Incorporation of flame-retardant antistatic colored sheet on the surface layer) Vinyl chloride resin 100 parts by weight Tricresyl phosphate 22 parts by weight Dibutoxyethyl phthalate 20 parts by weight Barium stearate 1.5 parts by weight Zinc stearate 1 0.5 parts by weight Polyoxyethylene alkyl ether 1.0 parts by weight Aluminum hydroxide 20 parts by weight

The vinyl chloride compound having the above composition is mixed and stirred at room temperature for 30 seconds using a Henschel mixer. When sufficiently mixed, 1 part by weight of titanium oxide and 3 parts by weight of phthalocyanine blue were added as colorants and kneaded for 1 minute with a Banbury mixer heated to 150 ° C. to gel the compound. It was rolled into a 0.45 mm thick blue sheet by a calendering machine adjusted to the temperature. As a result of measuring the flame retardancy of the sheet according to JIS Z 2150 (flame resistance test for thin materials), the carbonization area after heating for 1 minute was 8 cm, the after-flame after heating for 3 seconds, the after-flame was 0 seconds, and the residual dust was 0.
In seconds, the carbonized area showed a flame retardancy of 5 cm.

Using the sheet as the surface layer, the same laminated sheet as in Example 1 was obtained using the colored antistatic sheet, conductive sheet and woven fabric of polyester fiber of Example 1. The electrical performance of the obtained sheet was such that the volume resistance was 2.0 × 10 ⁶ Ω,
The sheet exhibited excellent performance with a surface resistance of 3.0 × 10 ⁷ Ω and a charged voltage of 0 V. The molten solder was dropped on the sheet, but did not penetrate, and the burn marks were smaller than those of the sheet of Example 1. Cut the antistatic sheet to a predetermined size,
Used as a mat for soldering repair work.

[0024]

According to the present invention, a conductive sheet layer is interposed between an antistatic sheet layer to which an antistatic agent and an antistatic plasticizer are added, and a heat-resistant fiber is added between the conductive sheet and the antistatic sheet. By interposing the conductive sheet and the antistatic sheet between the conductive layers, the conductive distance from the antistatic layer to the conductive layer becomes uniform and short, so that the electrical performance from the front and back surfaces is the same, It is an antistatic sheet with an excellent configuration that blocks the melt penetration of the sheet by molten solder with heat-resistant fiber, and because the conductive layer is in the middle,
There is no floating contamination due to detachment of conductive powder such as carbon black or short fibers. Further, it can be arbitrarily colored and has excellent design properties, and has excellent performance as a work mat for repairing electronic parts and precision equipment by soldering.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the heat-resistant antistatic sheet of the present invention.

FIG. 2 is a sectional view of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Colored antistatic thermoplastic synthetic resin sheet layer 2 ... Heat resistant woven fabric 3 ... Conductive thermoplastic synthetic resin sheet layer 4 ... Colored antistatic thermoplastic synthetic resin sheet layer 5 ... Flame retardant colored antistatic heat Plastic synthetic resin sheet layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) B32B 1/00-35/00 E04F 15/00-15/22 D06N 3/00-3/18

Claims (4)

(57) [Scope of request for utility model registration] 1. A heat-resistant woven fabric laminated on a colored antistatic thermoplastic synthetic resin sheet having a volume resistivity of 10 ⁸ to 10 ¹¹ Ω to which both an antistatic agent and an antistatic plasticizer are added. A conductive carbon black, a conductive metal powder, a conductive carbon fiber, and the like, on the heat-resistant woven fabric so as to penetrate the texture and conduct with the colored antistatic thermoplastic synthetic resin sheet.
A conductive thermoplastic synthetic resin sheet having a volume resistance of 10 ² to 10 ⁵ Ω to which a conductive material such as a conductive metal fiber is added is laminated, and further, an antistatic is formed on the conductive thermoplastic synthetic resin sheet. A colored antistatic thermoplastic synthetic resin sheet having a value of 10 < ⁸ > to 10 < ¹¹ > [Omega] to which both the agent and the antistatic plasticizer are added is laminated, and the volume resistance of the laminate is 10 < ⁵ > to 10 <10>. A heat-resistant antistatic sheet having a value of ⁸ . 2. The heat-resistant antistatic sheet according to claim 1, wherein the upper layer of the colored antistatic thermoplastic synthetic resin sheet is flame-retardant. 3. The conductive sheet according to claim 1, wherein the resin constituting the antistatic thermoplastic synthetic resin sheet and the conductive thermoplastic resin sheet is a vinyl chloride resin. 4. The heat-resistant woven fabric has a density (book / inch) of 8 to 25.
The heat-resistant antistatic sheet according to claim 1, wherein the sheet is a glass fiber, a carbon fiber, a polyamide fiber, or a polyester fiber.