JPH0642158U - Heat-resistant antistatic sheet - Google Patents

Abstract

(57) [Abstract] [Purpose] Coloring is possible, volume resistance is 10 ⁸ Ω or less, excellent electrical performance, sheet does not penetrate with molten solder dropped during soldering work, the same volume from both front and back To obtain a heat resistant antistatic sheet for work having a resistance value. [Structure] A heat-resistant woven cloth is laminated on a colored antistatic thermoplastic synthetic resin sheet 1 having a volume resistance of 10 ⁸ to 10 ¹¹ Ω, and a texture is penetrated on the woven cloth 2. A conductive thermoplastic synthetic resin sheet 3 having a volume resistance of 10 ² to 10 ⁵ Ω added with a conductive material so as to be electrically connected to the sheet 1 is laminated on the sheet 3, and a volume resistance of 1 is added to the sheet 3.
A colored antistatic thermoplastic synthetic resin sheet 4 having a value of 0 ⁸ to 10 ¹¹ Ω or a flame-retardant colored antistatic sheet 5 is laminated to form a four-layer structure, and the volume resistance of this laminate is 10 ⁵ to 1
Heat antistatic sheet having a value of 0 ^8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an antistatic work sheet to be laid under an electronic component or precision device when soldering and repairing the electronic component or precision device in the field.

[0002]

[Prior art]

 In the past, when electronic parts or precision equipment failed, an antistatic thermoplastic synthetic resin sheet containing a large amount of antistatic agent was added to prevent malfunctions such as malfunction due to static electricity when repairing or inspecting these equipment. , They were laid under these devices for repair and inspection work.

[0003]

[Problems to be solved by the device]

 However, in the conventional antistatic thermoplastic synthetic resin sheet, when the soldering repair work, the accidentally dropped molten solder melts and penetrates the sheet and scratches or burns on the desk or work table. The resin adhered to the table and the work table was damaged and contaminated, which was not preferable.

Further, the volume resistance of the sheet has been improved to 10 by improving the performance of electronic parts and precision equipment.⁸Electrical performance below Ω is desired, but the sheet with an antistatic agent added has a volume resistance of 10 ⁸ It is difficult to obtain a performance of Ω or less, and since an antistatic agent is added in a large amount, the antistatic agent migrates to the surface and adheres to the device and is not preferable. Although the volume resistivity can be set low at low cost, it is not preferable for work because it is limited to black, and it is vulnerable to abrasion due to the addition of a large amount of carbon black, and the carbon particles are removed from the surface to float. It is not preferable because it adheres to equipment and causes contamination.

Furthermore, 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 layer is used during soldering work. Is not preferable because it causes the problem.

Therefore, there is a demand for a work sheet that can be colored and has excellent volumetric resistance of 10 ⁸ Ω or less and excellent electrical performance, and that the sheet does not penetrate with the molten solder dropped during the soldering work.

[0007]

[Means for Solving the Problems]

According to the present invention, a heat-resistant woven fabric is laminated on a colored antistatic sheet, a conductive sheet is laminated on the heat-resistant woven fabric, and a colored antistatic sheet is laminated on the conductive sheet. It aims to solve the problems and provide an antistatic sheet having excellent electrical performance, designability, and heat resistance. The means is to add an antistatic agent and an antistatic agent to obtain a volume resistance of 10 ⁸ to 10 Colored antistatic thermoplastic synthetic resin having a value of ¹¹ Ω A heat-resistant woven fabric is laminated on a sheet, and the colored antistatic thermoplastic synthetic resin sheet is electrically connected to the heat-resistant woven fabric by penetrating the texture. Conductive thermoplastic synthetic resin sheet having a volume resistance of 10 ² to 10 ⁵ Ω to which conductive materials such as conductive carbon black, conductive metal powder, conductive carbon fibers, and conductive metal fibers are added. Are laminated, and the conductive heat Sex synthetic resin sheet on a volume resistivity of adding an antistatic agent and the antistatic plasticizer colored antistatic thermoplastic synthetic resin sheet and reports open the layered laminate having a value of 10 ⁸ ~10 ¹¹ Ω 10 ^The structure has a value of ⁵ to 10 ⁸ Ω, and the same volume resistance value can be obtained from both front and back.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the constitution of the heat-resistant antistatic sheet of the present invention, wherein 1 and 4 are colored antistatic thermoplastic synthetic resin sheet layers to which an antistatic agent and an antistatic plasticizer are added, and 2 is a heat-resistant And 3 is a conductive thermoplastic synthetic resin sheet layer.

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

Colored antistatic thermoplastic synthetic resin sheet layers 1, 4, 5 are vinyl chloride resins such as vinyl chloride resin, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-urethane copolymer resin, polyethylene, polypropylene. , Ethylene-vinyl acetate copolymer resin, ethylene-acrylate copolymer resin, and other olefin resins, urethane resin and other soft thermoplastic synthetic resins, particularly preferably vinyl chloride resin. a volume resistivity of 10 ⁸ to 10 ¹¹ Omega values obtained as nonionic, cationic antistatic agent, and dibutoxy ethylene phthalate, Buchirujigu recall adipate, Purasaiza M-300L (Kyowa Hakko), AM903 (product Water chemistry) and other antistatic plasticizers are added, and dioctyl phthalate and dinonyl phthalate are added. To add flame retardant to the surface layer 5 by adding general-purpose plasticizers such as rate, stabilizers, colorants, etc., phosphoric ester type plasticizers such as tricresyl phosphite, trixylene phosphate, hydroxylation, etc. Hydroxides such as aluminum and magnesium hydroxide, and flame retardants such as antimony oxide are added, and sheets are formed into a sheet having a thickness of 0.1 to 1 mm by calender molding, extrusion molding and the like.

The conductive thermoplastic resin sheet layer 3 is made of powder of carbon, nickel, stainless steel, aluminum or the like so that the volume resistivity of the thermoplastic synthetic resin is 10 ² to 10 ⁵ Ωcm. Conductive materials such as short fibers or inorganic particles surface-treated with tin oxide, zinc oxide, nickel, etc. are added singly or two or more kinds in an amount of about 5 to 50%, and general-purpose plasticizers, stabilizers, etc. are added, and the same applies. It is made into a sheet with a thickness of 0.1 to 1 mm.

The heat-resistant woven fabric 2 is a woven fabric in which the raw yarns are composed of polyester fibers, aromatic polyamide fibers, glass fibers, and carbon fibers, and these raw yarns are entwined or plain woven in a single or mixed manner, and the density (book / inch) ) Is preferably 8 to 25 and the thickness is 0.2 to 0.5 mm. When the density is 7 or less, the dripping molten solder penetrates the sheet, which is not preferable, and when the density is 26 or more, the sheets do not bite well at the time of lamination and the conductive sheet layer is difficult to bond to the lower antistatic layer. This is not preferable, and in this case, it is necessary to apply a conductive adhesive or a conductive vinyl chloride paste to the woven fabric and then laminate them.

As described above, the present invention sequentially applies the heat resistant fiber 2, the conductive sheet 3, the antistatic agent and the antistatic plasticizer on the colored antistatic sheet 1 to which the antistatic agent and the antistatic plasticizer are added. The colored antistatic sheets 4 and 5 containing and are laminated and laminated by thermocompression bonding at a temperature of 180 to 200 ° C.

Next, a specific embodiment of the present invention will be described. Example 1 (Compounding with colored antistatic sheet) Vinyl chloride resin 100 parts by weight Dioctyl phthalate 25 parts by weight Dibutoxyethyl phthalate 20 parts by weight Berium stearate 1.5 parts by weight Zinc stearate 1.5 parts by weight 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 in a Henschel mixer at room temperature for 30 seconds. When mixed well, 1 part by weight of titanium oxide and 3 parts by weight of phthalocyanine blue were added as colorants, and the mixture was kneaded for 1 minute with a Banbury mixer heated to 150 ° C to gel the compound. A 0.45 mm-thick blue sheet was rolled using a calendar molding machine adjusted to a temperature of ° C.

(Combining 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 Keshchen black 30 parts by weight 20 parts by weight calcium carbonate

The vinyl chloride compound having the above composition is mixed and stirred in a Henschel mixer at room temperature for 30 seconds. Once mixed well, knead for 2 minutes in a Banbury mixer heated to 150 ° C to gelate the compound and then use a calender molding machine adjusted to a temperature of 180 ° C The black sheet was rolled.

On the colored antistatic sheet obtained as described above, the raw yarn is polyester fiber, the density (book / inch) is 19, and the plain weave cloth having a thickness of 0.33, the conductive sheet, the colored antistatic sheet. A heat resistant antistatic sheet of blue of 1.5 mm was obtained while heating and embossing at 190 ° C. while sequentially laminating the sheets.

The electrical performance of the sheet is excellent in that the volume resistance is 2.0 × 10 ⁶ Ω, the surface resistance is 3.0 × 10 ⁷ Ω, and the electrification voltage is 0 V. However, it stopped at the heat resistant fiber and did not penetrate.

Example 2 (Compounding a flame-retardant antistatic coloring sheet for 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 in a Henschel mixer at room temperature for 30 seconds. When mixed well, 1 part by weight of titanium oxide and 3 parts by weight of phthalocyanine blue were added as colorants, and the mixture was kneaded for 1 minute with a Banbury mixer heated to 150 ° C to gel the compound, and then 180 ° C. It was rolled into a 0.45 mm-thick blue sheet with a calendering machine adjusted to the above temperature. The flame retardancy of the sheet was measured according to JIS Z 2150 (flameproofing test of thin material), and the carbonized area after heating for 1 minute was 8 cm, after burning for 3 seconds after heating 0 seconds for afterflame 0 seconds, and dust 0 The carbonization area was 5 cm and flame retardancy was exhibited.

A laminated sheet similar to that of Example 1 was obtained by using the colored antistatic sheet, the conductive sheet and the polyester fiber woven cloth of Example 1 with the sheet as a surface layer. The electrical properties of the obtained sheet were excellent in that the volume resistance was 2.0 × 10 ⁶ Ω, the surface resistance was 3.0 × 10 ⁷ Ω, and the electrification voltage was 0 V. Molten solder was dropped on the sheet. However, it did not penetrate, and the number of burn marks was smaller than that of the sheet of Example 1. The antistatic sheet is cut into a predetermined size and used as a mat for soldering repair work.

[0024]

[Effect of device]

 The present invention interposes a conductive sheet layer between an antistatic sheet layer containing an antistatic agent and an antistatic plasticizer, and further, heat-resistant fibers are provided between the conductive sheet and the antistatic sheet. Since the conductive sheet and the antistatic sheet are electrically connected to each other, the conductive distance from the antistatic layer to the conductive layer is even and short, so the electrical performance from the front and back surfaces is the same and the antistatic property is excellent. It is an antistatic sheet with an excellent configuration that blocks fusion penetration of the sheet due to molten solder with heat-resistant fiber.Because the conductive layer is in the middle, detachment of conductive powder such as carbon black and short fibers There is no floating pollution due to. In addition, it can be arbitrarily colored and has excellent designability, and has excellent performance as a work mat for repairing electronic parts and precision equipment by soldering.

[Brief description of drawings]

FIG. 1 is a sectional view of a 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

Claims (4)

[Scope of utility model registration request] 1. 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, to which an antistatic agent or an antistatic plasticizer has been added. Conductive material such as conductive carbon black, conductive metal powder, conductive carbon fiber, conductive metal fiber, etc. on the flexible woven fabric so as to penetrate the weave and conduct with the colored antistatic thermoplastic synthetic resin sheet. The added volume resistance is 10 ² to 10 ⁵ Ω
Laminating conductive thermoplastic synthetic resin sheet having a value of
Furthermore, the volume resistance obtained by adding an antistatic agent or an antistatic plasticizer onto the conductive thermoplastic synthetic resin sheet is 10 ⁸ to 10
A heat-resistant antistatic sheet in which a colored antistatic thermoplastic synthetic resin sheet having a value of ¹¹ Ω is laminated, and the volume resistance of this laminate is 10 ⁵ to 10 ⁸ . 2. The heat-resistant antistatic sheet according to claim 1, wherein the upper layer 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 (books / inch) of 8 to 25.
The heat-resistant antistatic sheet according to claim 1, which is a glass fiber, a carbon fiber, a polyamide fiber, or a polyester fiber.