JPS6367141A - Antistatic laminated sheet - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is applicable to electronics-related factories, clean rooms, operating rooms, clinical test rooms, computer rooms, telecommunications rooms, ship radio rooms, explosive factories, combustible materials warehouses, scientific This relates to anti-static laminated sheets used for floors in areas where damage is easily caused by static electricity and dust.

[Conventional technology]

Conventionally, conductive metal sheets such as aluminum or stainless steel, or conductive carbon powder, metal powder, short fibers, etc., have been kneaded into the floor surfaces in areas that are susceptible to damage from static electricity or dust. Synthetic resin sheets 1~ were used.

However, in the case of the former metal sheet, the sheet surface is hard and
Not only are there problems such as walking noise and vibration, but the entire seat is made of conductive metal, which makes it highly conductive, and there is a risk of electric shock due to electrical leakage from devices used on the floor. In addition, there were other problems such as being expensive and having poor workability.

On the other hand, in the case of the latter synthetic resin sheet, due to abrasion of the sheet surface, the kneaded carbon powder, metal powder, short fibers, etc. peel off from the sheet, and this turns into dust that adheres to, for example, semiconductors and is used in computers. This can cause problems such as malfunctions, and the metal powder and short fibers may deteriorate due to oxidation, resulting in the antistatic performance decreasing over time and the initial performance disappearing in a short period of time. Ta.

[Problem that the invention seeks to solve]

The present invention has been made against the background of the problems of the prior art, and has an antistatic function as a whole, a surface layer has an antistatic function, and a back layer has a conductive function. Moreover, it is an object of the present invention to provide an antistatic laminated sheet that has excellent durability and dust prevention properties.

[Means to solve the problem]

That is, the present invention has a volume resistivity of 1×10 on the surface side.
It has a dust-proof synthetic resin layer with a resistance of 4 to 1 x 10 I0 Ω・Cm, and a resistance value of 1 x 10° to 1 x 104 Ω on the back side.
・For antistatic use, characterized by having a conductive base material layer of cm, and having a volume resistivity value of 1 x 106 to 1 x 10 I0Ω・■ as a laminate having a synthetic resin layer and a base material layer. The present invention provides a laminated sheet.

Hereinafter, to explain the present invention in detail, the volume resistivity on the surface side of the antistatic laminated sheet is 1 x 106 to 1 x 1010.
The synthetic resin layer with excellent dust prevention properties of Ωcm is formed from a synthetic resin composition mixed with an antistatic plasticizer and/or an antistatic agent and/or a conductive substance. The thickness of is preferably 0.2 to 5 mm, and 0.
．． If it is less than 2R, the abrasion resistance is poor, while if it is more than 51, the sheet tends to warp toward the surface, and at the same time, the distance to the base layer becomes long, and the antistatic function of the resulting sheet deteriorates.

Further, this synthetic resin layer may be a single layer or a multi-layer. In the case of a multi-layer, the synthetic resin layer may be composed of, for example, the two most layered upper layers and an intermediate layer of a foam layer disposed below the upper layer. A printed layer containing a foaming inhibitor and/or a foaming accelerator may be interposed between the upper layer and the intermediate layer.

That is, before heating and expanding the intermediate layer, a foaming suppressor and/or a foaming accelerator that changes the decomposition temperature of the expanding agent blended in the composition of the intermediate layer is applied to the surface of the intermediate layer. Later, by laminating a top layer on these surfaces and then heating it to a temperature at which the expansion agent decomposes, the surface portion of the synthetic resin layer coated with the foaming suppressor and/or foaming accelerator is coated with this layer. It may be formed to have a thickness different from that of the rest of the sheet to give the sheet a three-dimensional design effect.

In this case, if the top layer is transparent or translucent, the design effect will be more effectively achieved when the intermediate layer and the printing layer containing the foaming inhibitor and/or foaming accelerator are colored. The thickness of this upper layer is 0.1 to 1
111I is preferred. This is because if the thickness is less than 0.1 m, the abrasion resistance is poor, while if it exceeds IN, the sheet tends to warp toward the surface and also becomes expensive.

Further, the intermediate layer may be a foamed layer as described above or a non-foamed layer, but if the resulting sheet is required to have cushioning properties, it is preferably the foamed layer.

Furthermore, this surface layer can also be made into a sheet with improved design by using colored synthetic resin chips that partially use conductive chips.

In addition, examples of the main synthetic resins constituting this synthetic resin layer include vinyl chloride resin, acrylic resin, vinyl acetate resin, polyethylene, polypropylene, and ethylene-based resin.
Examples include vinyl acetate copolymer resins and urethane resins, but vinyl chloride resins are preferred in terms of wear resistance and cost.

The vinyl chloride resin in the present invention refers to polyvinyl chloride resin, vinyl chloride and other monomers, such as ethylene, vinyl acetate, vinyl ether, maleic ester,
It also includes copolymers with (meth)acrylic acid, (meth)acrylic acid esters, acrylonitrile, urethane, etc., and mixtures of other polyvinyl chloride resins and other polymers.

In addition, antistatic plasticizers mixed into the synthetic resin layer include tributoxyethyl phosphate (manufactured by Ohana Kagaku ■, TBXP), butyl diglycol adipate (manufactured by Ohana Kagaku ■, BXA), Sansocizer C-1100 (manufactured by Ohana Kagaku ■, BXA), (manufactured by Shin Nippon Rikagaku ■), 5E-673, 5R-172, 5E
-871 (both manufactured by Riken Vitamin Oil ■) etc. are preferred, and general-purpose products such as dioctyl phthalate, dibutyl phthalate, butylbenzyl phthalate-1, dioctyl adipate, dioctyl phthalate, diisononyl phthalate, etc. are preferred depending on the desired volume resistivity value. It is used to replace part or all of the plasticizer in the synthetic resin, and the amount is preferably from 5 to 00 parts by weight per 100 parts by weight of the synthetic resin, and if it is less than 5 parts by weight, the resulting sheet will be charged On the other hand, if the amount exceeds 100 parts by weight, not only the antistatic function will not increase proportionally, but also the physical properties of the resulting sheet will deteriorate.

Furthermore, the antistatic agent mixed into the synthetic resin layer includes commonly used antistatic agents such as cationic, anionic, and nonionic antistatic agents, and the amount thereof is usually 100 parts by weight of the synthetic resin. On the other hand, it is preferably 0.2 to 10 parts by weight; if it is less than 0.2 parts by weight, the antistatic properties of the resulting sheet will decrease, while if it exceeds 10 parts by weight, not only will the antistatic properties not increase proportionally, but The physical properties of the resulting sheet also deteriorate.

Furthermore, as the conductive substance mixed into the synthetic resin layer, carbon powder, carbon short fibers, inorganic and organic powders or short fibers subjected to surface conductivity treatment [conductive calcium carbonate T13 (1-2500 (Nitto powder) (manufactured by), EC
-1, E(, -5 (all made by Maruo Riki Lucium),
Those whose electrical resistance does not decrease due to oxidation are preferred, such as Dentol WK-10O3 (manufactured by Otsuka Chemical Co., Ltd.) and Thunderon 5S-N (manufactured by Nippon Reina Sensai Kaisha).

The conductive powder at this time has a particle size of 0.5-L, 000
8m1 or conductive short fibers have a particle size of 1 to 600 μm,
The length is preferably in the range of 0.5 to 20 mm.

In addition, the amount of the conductive substance to be blended is preferably 50 parts by weight per 100 parts by weight of the synthetic resin, in order to prevent the generation of dust due to abrasion, for example, when used in the top layer of a multilayer structure.
It is not more than 5 parts by weight, more preferably 5 to 30 parts by weight,
In addition, when used as an intermediate layer in a multilayer structure, synthetic resin 1
The amount is preferably 2 parts by weight or more, more preferably 5 to 500 parts by weight.

The above compounding agents may be used alone or in combination of two or more.

In addition, compounding agents such as plasticizers, stabilizers, fillers, blowing agents, antifungal agents, and colorants may be added as necessary.

Next, as the base material layer on the back side of the antistatic laminated sheet, materials generally used as sheet base materials, such as natural animal or vegetable fibers, ashest, glass fiber, rock wool, pulp, synthetic Woven fabrics, non-woven fabrics, knitted fabrics, paper, etc. in which inorganic or organic fibers such as fibers are used alone or mixed as appropriate, are impregnated with a conductive resin liquid containing the above-mentioned conductive substances, and other paper-making methods are used. Conductive fibers,
A mixture of conductive powder, conductive-treated powder or fiber, or a woven fabric or knitted fabric made by weaving or knitting these conductive fibers or conductive-treated fibers can be used.

Among them, carbon fiber and carbon powder are used in this nonwoven fabric.
Paper (glass mixed paper, inorganic paper, glass fiber paper, etc.) mixed during papermaking is particularly suitable as a sheet base material in terms of dimensional accuracy and cost.

The thickness of this base material layer is usually preferably 0.1 to 2. If the thickness is less than 0.1, the sheet strength of the obtained sheet will be weak, while if it exceeds 2, the cost will increase. Become.

The total sheet thickness of the antistatic laminated sheet 1- consisting of these synthetic resin layers and base material layer is preferably 1 to 7 U, and when the thickness is less than IH, the thickness of the floor surface on which this sheet is laid is While the unevenness is easy to stand out, once you pass the 7 dragons, the sea i
・It becomes heavier and difficult to handle during installation,
It also increases costs.

When the laminated sheet of the present invention is used as a flooring material, it effectively removes static electricity from people working on it and various devices, and also eliminates the risk of electric shock due to electrical leakage from devices, etc. In addition, dust from the laminated sheet,
A highly safe flooring material that does not generate dust can be obtained.

Further, the synthetic resin layer on the surface side can be colored in a wide range of hues when a light-colored antistatic plasticizer, antistatic agent, or the like is mainly used.

In addition, in the case of a multi-layer structure, by incorporating a foaming inhibitor and/or a foaming accelerator into the printing layer interposed between the uppermost layer and the intermediate layer, the color and three-dimensional effect can be enhanced. It is highly decorative, and when colored in bright colors, it improves the lighting efficiency in the room and makes the room brighter.

Furthermore, when a flexible material is used as the base material, the laminated sheet of the present invention can be rolled up into a long length in combination with the synthetic resin layer of the surface layer, and is highly flexible and does not break even when folded. It also has excellent workability.

When constructing the laminated sheet of the present invention, metal foil is partially adhered to the joint between the sheets on the back side of the sheet, and further metal foil with a ground wire connected to the edge of the sheet is adhered to provide grounding. It is possible to install using a normal construction adhesive, or if the construction base is conductive such as concrete, it can be installed using a conductive adhesive or a combination of both. It is.

Furthermore, when laying the antistatic laminated sheet of the present invention, for example, in addition to using it in the form of a long sheet, it can be used in the form of tiles cut to a predetermined width using a general construction adhesive (synthetic rubber latex, acetic acid, etc.). By adhering to the floor surface of a raised floor using vinyl resin solvent-based, epoxy resin-based, acrylic emulsion-based, EVA emulsion-based, etc.) or conductive adhesive, it can also be used as a surface material for raised floor riverbeds. It is.

[Effect]

The antistatic laminated sheet I of the present invention has a dustproof synthetic resin layer with a volume resistivity of 1 x 104 to 1 x 1010 Ωcm on the front side, and a resistance value of 1 x 100 to 1 x 1010 on the back side. 1×
A conductive base material layer of 104 Ω is arranged, and the volume resistivity value as a laminate having a synthetic resin layer and a base material layer is I
], 06~IX] By setting the value to 0'°Ω・CIIl, the static electricity generated on the sheet itself and other parts is released in the horizontal and vertical directions and is efficiently eliminated, thus preventing the generation of static electricity and the sheet surface. The antistatic function of preventing dust from adhering to the sheet can be improved, and since no special means for electrically connecting the synthetic resin layer and the base material layer is required, the number of manufacturing steps can be reduced when manufacturing this sheet. Therefore, it is possible to reduce costs.

Furthermore, a multi-layered synthetic resin layer with so-called chemical embossing is highly decorative.

〔Example〕

Examples of the present invention will be described in detail below.

Example 1 The antistatic laminate sheet of Example 1 is made of conductive glass containing glass fiber, pulp, synthetic resin binder, etc., which is made by mixing 5% by weight of carbon fiber into a conductive base material (base material layer). Mixed paper (resistance value: 2.l x 102Ω・cm, thickness: 0.
45), and the foamable vinyl chloride resin paste (Tl) listed in Table 1 is applied to the surface of this conductive glass mixed paper.
was applied to a thickness of 0.6 mm, heated at 180°C for 1 minute to gel, and then a part of the pattern was printed with multicolor gravure using printing ink containing a foaming inhibitor. The surface of the sheet that has been processed and further subjected to this printing process.”
Second, after applying the transparent vinyl chloride resin paste (1) listed in Table 1 to a thickness of 0.4 mm,
The foamable polyvinyl chloride resin paste (TI) is heated at 210°C for 1 minute and 40 seconds to foam the printed pattern and the uneven pattern, resulting in a good overall thickness for decoration.2. It is a sheet of Omm.

This antistatic laminated sheet has a volume resistivity of 9.0.
× 10 11 Ω cm, and the resistance value is 5 × 10 6 Ω based on the static electricity safety guidelines of the Industrial Safety Research Institute of the Ministry of Labor,
Furthermore, the charge decay time (STATIC Decay Me
ter 406B: 5kv+, - application, 0% cut
off: According to FD/Method 406C)
The time was 0.03 seconds, which was excellent.

Table 1 Table 1-2 The volume resistivity value is 5M-1 manufactured by Toa Denpa Kogyo ■.
It was measured using a 0E type ultra-super insulation meter.

Moreover, the resistance value of the conductive base material is a value measured with a normal resistance meter. Furthermore, the resistance value of the synthetic resin layer is a value measured when each synthetic resin composition is processed into a sheet shape.

Example 2 The antistatic laminated sheet of Example 2 uses the same conductive base material and transparent vinyl chloride resin paste (I) as the antistatic laminated sheet of Example 1, and uses a new foamable vinyl chloride resin. The foamable vinyl chloride resin paste (III) listed in Table 2 was used in place of the paste (II), and it was made in the same manner as in Example 1 to give a good overall decorative appearance with a matching printed pattern and uneven pattern. Thickness 2. It is a laminated sheet of Omm.

This antistatic laminated sheet has a volume resistivity of 3.6.
x10”Ω・cm, resistance value is 2×106Ω based on the static electricity safety guidelines of the Industrial Safety Research Institute of the Ministry of Labor, and charge decay time is 0.
．． It showed good antistatic properties of 0.02 seconds.

a Table 2 Example 3 In addition to the same conductive base material as the antistatic laminate sheets of Examples 1 and 2, the antistatic laminate sheet of Example 3 also contains transparent materials listed in Table 3. foamable vinyl chloride resin paste) (rV) and foamable vinyl chloride resin paste)
(V) was used in the same manner as in Examples 1 and 2 to achieve a total thickness of 2. with good decorativeness and a matching printed pattern and uneven pattern. This is a laminated sheet of OU.

The antistatic laminated sheet No. 1 has a volume resistivity of 6.5X.
109Ω・Cm, the resistance value is 3X107Ω based on the static electricity safety guidelines of the Industrial Safety Research Institute of the Ministry of Labor, and the charge decay time is 0.
It had good antistatic properties of 0.04 seconds.

Table 3 Table 3-2 Example 4 The antistatic laminate sheet of Example 4 was coated with the colored vinyl chloride resin listed in Table 4 on the surface of the same conductive base material as the antistatic laminate sheet of Example 1. This is a laminated sheet with a total thickness of 1.5 mm, in which paste (VI) is applied to a thickness of one crane, heated at 200° C. for 2 minutes to gel, and colored in a pale solid color.

This antistatic laminated sheet has a volume resistivity of 4.0.
XIO'Ω・cm, resistance value based on the static electricity safety guidelines of the Industrial Safety Research Institute of the Ministry of Labor is 2X105Ω, charge decay time is 0
．． It had good antistatic properties of 0.02 seconds.

Table 4 Comparative Examples 1 to 3 The vinyl chloride resin paste compositions shown in Table 5 were combined as shown in Table 6 in the same manner as in Example 1 to achieve a total thickness with good decorativeness and a matching printed pattern and uneven pattern. A laminated sea 1- with 2.0 fins was obtained.

Table 6 shows the results of measuring the volume resistivity value, resistance value based on the static electricity safety guidelines of the Industrial Safety Research Institute of the Ministry of Labor, and charge decay time of this laminated sheet.

As is clear from these results, all of them have poor antistatic performance and are unsuitable for use in the field targeted by the present invention.

(The following are blank spaces) Table 5 Table 6 [Effects of the invention] As described above, the antistatic laminated sheet of the present invention has a dust-proof property with a volume resistivity of 1 x 106 to 1 x 1010 Ωcm on the surface side. A synthetic resin layer of is arranged, and a resistance (i 1
By arranging a conductive base material layer of X100 to IXIQ6Ω, and setting the volume resistivity value of the laminate having a synthetic resin layer and a base material layer to 1×106 to 1X1010Ω・cm, this sheet itself and the sheet Efficiently eliminates static electricity by dissipating it horizontally and vertically,
Therefore, it is possible to improve the antistatic function of preventing the generation of static electricity and the adhesion of dust to the sheet surface, and also to prevent dust generation. Since no special means are required, the number of manufacturing steps can be reduced in manufacturing this sheet, and therefore costs can be reduced.

In addition, a multi-layered synthetic resin layer subjected to so-called chemical embossing has excellent decorative properties in addition to antistatic properties, and is useful for applications such as flooring.

Patent applicant: Achilles Corporation Agent: Patent Attorney Takashi Shirai Voluntary writing of procedural amendments) October 15, 1986

Claims (1)

[Claims] (1) Volume resistivity value 1×10^6 to 1×10 on the surface side
It has a dust-proof synthetic resin layer of ＾1＾0Ω・cm, while the resistance value on the back side is 1×10＾0 to 1×10＾4Ω・cm.
The volume resistivity value of the laminate having a synthetic resin layer and a base material layer is 1×1.
An antistatic laminated sheet characterized by having a resistance of 0^6 to 1 x 10^1^0 Ω·cm.