JPS59228040A - Carpet base cloth - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carpet base fabric, and more particularly to a carpet base fabric woven from conductive thermoplastic resin stretched tape yarns and having antistatic properties.

With the advent of tufted carpets in particular, carpets can now be produced at low cost and in large quantities, by planting piles of synthetic fibers such as acrylic fibers and Chiron fibers on a woven base fabric of stretched tape yarn of thermoplastic resin such as polypropylene. It is now widely used not only for household purposes, but also as flooring materials for buildings, offices, automobiles, railways, and other means of transportation. However, on the other hand, there are also increasing problems such as the generation and accumulation of static electricity due to contact friction, etc., which causes electric shock to the human body, and the generation of noise and damage to various equipment such as computers. .

Methods to solve these problems include weaving conductive fibers such as carbon fibers, metal fibers, and metal-plated fibers into the base fabric, mixing conductive substances into the backing material, and mixing antistatic agents into the pile material. There have been proposals for methods such as applying it to the skin. However, these methods have insufficient antistatic effects, and the former two methods have problems in terms of economy and the latter method has problems in terms of durability, so they do not fully meet market needs. The current situation is that no solution has been found.

In view of the above-mentioned current situation, the present invention was made with the purpose of providing a carpet base fabric, especially a tufted carpet base fabric, which can produce a carpet having excellent antistatic performance even in low humidity conditions. In detail below, the carpet base fabric of the present invention contains 10 to 30% by weight of carbon black having a specific surface area of 500 m'/2 or more on one or both surfaces with a thickness of at least 0.3 μm. O which is woven using a thermoplastic resin drawn tape yarn formed from a conductive thermoplastic resin composition in at least one of the warp and weft.The thermoplastic resin constituting the conductive thermoplastic resin composition in the present invention. Examples include polyethylene, polypropylene,
Polyolefins such as ethylene-propylene copolymer,
Examples include polyamide type and polyester type.

In addition, carbon black has a specific surface area of 500 r.
r? /f or more is essential, and the specific surface area is 5o
Orr? If it is less than /r, a carpet with sufficient antistatic performance cannot be obtained. Specific surface area is 500tr? Specific examples of carbon black of /V or higher include conductive furnace black, super conductive furnace black, and extra conductive furnace black. ) is preferred.

In the present invention, the specific surface area is measured by the most common BET method using nitrogen gas, and the details of the measurement method can be found, for example, in Maruzen ■, published on March 15, 1980. ``Chemistry Handbook Applied Edition (Revised 3rd Edition)'' No. 68
It is described on pages 8-689.

In order to prepare a conductive thermoplastic resin composition from the thermoplastic resin and the carbon black, a heat stabilizer, a light stabilizer, a pigment, a lubricant, an antiblocking agent, a flame retardant, etc. are further added as necessary. The melt-kneading may be carried out using a known method such as a Banbury extruder, a Roll extruder, a Flabender extruder, a twin-screw extruder, or the like.

At this time, 10-30% of the carbon black is added to the composition.
It is necessary to prepare it so that it contains % by weight. If the content of carbon black in the composition is less than 10% by weight, a carpet with sufficient antistatic performance cannot be obtained, and even if the content exceeds 30% by weight, control due to increase in the amount increases. This is because the effect of improving electrical performance is not recognized and this only results in economic disadvantage.

The thermoplastic resin stretched tape yarn in the present invention is obtained by generally uniaxially stretching the conductive thermoplastic resin composition by a known method using an oven, roll, hot plate, or the like. Further, the stretched tape yarn may be a laminate having a layer made of the conductive thermoplastic resin composition on one or both surfaces of the layer made of the thermoplastic resin; The layer is at least 3 sails
A thickness of μ is required. This is because if the thickness is less than 0.3 μm, a carpet with sufficient antistatic performance cannot be obtained. The stretched tape yarn made of this laminate can be produced by either a method in which the two are laminated by a known method such as sequential extrusion lamination, coextrusion lamination, or dry lamination before stretching, or a method in which both are laminated after being stretched individually. It can also be obtained by

In the present invention, [at least 0.3 on one or both surfaces]
Is the specific surface area of the part with a thickness of μ 500? F! The term "thermoplastic resin drawn tape yarn formed from a conductive thermoplastic resin composition containing 10 to 30% by weight of carbon black or more" has the same meaning as described above.

Note that this stretched tape yarn generally has a stretching ratio of 3 to 9 times and a fineness of about 250 to 1500 denier.

The carpet base fabric of the present invention is a sluzer type loom in which the thermoplastic resin stretched tape yarn is used in at least one of the warp and weft, and the number of threads per prefecture is about 12 to 30 per width of 2.54. It can be obtained by weaving using a water jet loom, a circular loom, or the like. In addition, in the carpet base fabric of the present invention, as described above, in addition to the case where the above-mentioned stretched tape yarn is used for the gold thread of at least one of the warp and weft threads, C is determined according to the required level of various uses. 1] This also includes the case where the drawn cheese yarn is used in a proportion of one in three or one in five and mixed with conventional drawn tape yarn.

The carpet manufactured using the carpet base fabric of the present invention described above has excellent antistatic performance that could not be achieved with conventionally known technology, especially antistatic performance that is not affected by the environment such as humidity. The effect is that the sustainability of the power training performance is excellent.

The present invention will be explained in more detail with reference to Examples below.

Examples 1 to 5, Comparative Examples 1 to 5 Carbon black manufactured by Lion Akzo with a specific surface area of too much and 7'r [Ketjenblack ECJ and polypropylene manufactured by Mitsubishi Yuka Co., Ltd. (melt flow rate 6-5y/1o)
) were melt-kneaded in a Banbury mixer, and the carbon black content was 9% by weight and 15% by weight using a pelletizer.
A pellet-shaped conductive thermoplastic resin composition containing 30% by weight was obtained. Similarly, specific surface area 520 m'/
Using V's 2-ion Akzo carbon black "Ketjenblack ECJ", carbon blank content 15
% composition by weight was obtained. Furthermore, the specific surface area is 220 m'/
A composition having a content of 30% by weight was obtained using Furnace Black [Palcan XC-72J] manufactured by Cabot Corporation in the United States.

Next, the above composition was placed in a 40g3 extruder, and polypropylene manufactured by Mitsubishi Yuka Co., Ltd. (Melt Flowray) was placed in a 901 extruder.
．． Of? 710 minutes) and coextrusion to obtain a sheet-like product having a total thickness of 40 μm and having a layer of the above-mentioned composition on one or both surfaces. By stretching this sheet-like material four times with a roll stretching machine, the thickness of the composition layer was reduced to 0 at 1000 denier.
．． Stretched tape yarns of 25μ, 0.5μ and 1μ were obtained. In addition, drawn chive yarns of 500 denier and 1000 denier without the above composition layer were prepared. The properties of the obtained thermoplastic resin-rolled yarn are shown in Table 1.

This drawn tape yarn is used to create a sluzer type loom.
Carpet base fabrics shown in Table 2 were woven.

A carpet was manufactured by planting nylon semi-worsted wool on this base fabric using taffeta (5/64 gauge) manufactured by Hankan Kogyo Co., Ltd. Table 2 shows the antistatic performance of the carpet.

(Margin below)

Claims (1)

[Claims] A portion of at least 0.3 μ thick on one or both surfaces is coated with carbon black having a specific surface area of 500 m'/f or more.
A carpet base fabric woven using a thermoplastic resin drawn tape yarn formed from a conductive thermoplastic resin composition containing 0 to 30% by weight in at least one of the warp and weft.