JPS59100780A - Carpet excellent in anti-static property - 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 that causes less electric shock and has excellent antistatic performance.

Carpets using synthetic fibers as piles tend to generate static electricity, and anti-static measures are an important issue, especially in contract carpet applications. In service industries such as hotels and theaters, the static electricity generated after walking on carpets is dielectrically charged to the human body, and people are sensitive to the electric shock that occurs when this static electricity touches metal fittings such as doorknobs. However, carpets that generate static electricity are prohibited in offices, hospitals, schools, and kindergartens.

These days, the generation of static electricity, especially in computer rooms, is extremely disliked because it disrupts the precision of machines, and a high degree of anti-static properties are required.

As a way to prevent static electricity on synthetic fiber carpets,
Basically, the following four methods are common: (1) At the dyeing stage, the pile is sprayed with a banding-preventing substance.

(2) An antistatic substance is mixed at the stage of manufacturing fibers.

(3) Vj conductivity 1B such as metal fibers and metal plated fibers
< , lf# is mixed in the pile 1. (4) Metal particles, carbon particles, carbon fibers, etc. are dispersed in the backing latex.

However, in general, the methods of spraying antistatic substances onto piles or mixing antistatic agents into piles have the disadvantage that they cannot absorb enough moisture in dry areas, so the antistatic effect decreases. The method of mixing conductive fibers such as frozen metal fibers in the pile has the disadvantage that the hue of the pile changes and the appearance of the carpet is impaired. Various methods have been proposed for using conductive latex to which conductive substances have been added as a banking agent. It has been reported that the conductive properties of carpets can be improved by adding substances, but if the amount added is too large, the state of dispersion or adhesion cannot be made uniform, and the added fibrous conductive substances may spread to the back of the carpet. The latex clumps up in parts, creating periodic surface irregularities (marine ripples), which reduces the adhesion performance of the latex and causes the backing layer to become clumps during carpet handling.
・'It'if' causes cracks, etc., resulting in poor practical durability, and also falling off due to washing, reducing antistatic effect. Furthermore, since the conductive fibers added during the backing process adhere to the rollers, there is a drawback that it is impossible to reproduce and produce them as a commercial product. 8′
(As a preventative measure, apply latex to the gray fabric and blow air from countless small holes in the direction of movement of the base fabric and horizontally to the base fabric while it is still wet, or use a roll, slit, etc.) 47. The base fabric is passed through the backing layer at an angle to the direction of travel.
It also gives carbon fiber in the backing layer a two-way sword.”・
The carbon fibers are aligned in the pile yarn direction by shifting in the j direction (horizontal to the plane of the material), and then the backing layer is dried to fix the alignment. Method for improving conductivity (Japanese Patent Application Laid-Open No. 51-10
No. 2325) has been proposed, but it is not practical.

Also, it is possible to disperse metal particles, carbon particles, etc. into the backing latex as a conductive substance! , ri, 11
The technique of dispersing the particles evenly in the bag is difficult, and in order to provide a sufficient antistatic effect, it is necessary to mix A11 into the latex. It has the disadvantage of reducing adhesive performance, deteriorating durability, and reducing the antistatic effect due to getting stuck and falling off due to washing.Carpets that use synthetic fibers as pile material have a significant electrostatic potential on the human body at low temperatures.J, 71 ;l Add that.
;(The cause is generally the carpet, ・ji1 is '+'
It is believed that the main reason for this is that the backing layer that forms the carpet acts as an insulator, preventing the static electricity generated on the pile surface from being conducted to other areas through the back surface of the carpet. Therefore, by making the backing J + "j more electrified, the control of the carpet '11□: ('-1 + is improved, which is well known. The present invention Nagisa et al. V" As a result, the combined use of fiber #lf:-shaped conductive additives and granular conductive additives resulted in less pressure and improved compound stability compared to when each was used alone. The present invention was achieved by discovering that good !fil'ljj properties can be imparted to carpets using the same method and without the need for special coating conditions.

In the present invention, a pile-forming synthetic tAM ff1
(As I, any ultrafine fiber such as polyamide, polyester, polyolefin, polyacrylonitrile polymer, or a copolymer thereof can be used. Furthermore, a fiber generally called antistatic tfRRWE,
In other words, fibers that prevent static electricity by incorporating conductive substances such as carbon or stainless steel into the 1.2 pairs, or gold and 1', 1. *, There are also some that incorporate k4f at a certain rate.

Furthermore, these synthetic fibers may be blended with compounding agents that are usually added to the fibers themselves, such as polishing agents, colorants, plasticizers, fillers, etc.

Conductive additives added to latex --, ;r, i',
Carbon fibers or aluminum fibers are effective as cone-shaped materials, and carbon black is effective as granular materials. The fiber length of the fibrous conductive additive is desirably io or less.

If it exceeds io, the dispersion becomes too strong and phenomena such as entanglement of fibers occur, resulting in poor effectiveness. Asvector
1. If the weight is 90 to 50,075, if the value is off, a so-called balling phenomenon will occur.
It becomes difficult to handle <, +g glue. Carbon fiber lifting platform Moya & J, 9 From the point of view of ease of handling, the aspect ratio is 1.
02-5 x 103 is preferred. As for the granular isoelectric additive, it is suitable that it has a specific resistance of lo2Ωcm to 1o-6Ωm, a specific gravity of 3.0 or less, and an 8i5j diameter of 150μ or less. If the ratio jF exceeds 3.0,
It is difficult to disperse it in latex, and it cannot be effective unless it settles and separates over time. for example,
Carbon black, graphite, and aluminum may be used, but carbon black is preferred from the viewpoint of performance.

The amount of the specialized additive to be added is 0.3 to 0.9 parts (1-: part), aluminum (1-: parts) when the fiber-formed conductive additive is carbon fiber, per 100 parts by weight of the latex solid content. In the case of i-layer fiber, 2, 0-5, OjJi-iii part, granular he? j
It is preferable that the electric material has a diameter of 3.0 to 10.0. When the fibrous conductive additive is carbon fiber, the amount added is 0.
If the number of carbon blacks is less than 3 parts, the number of carbon black bars will increase to obtain sufficient conductivity (11), and the stability of the latex will be impaired. Also, in the case of aluminum fibers, it is necessary to add 3.0 parts or more for the same reason. When the amount of carbon fiber added exceeds 0.9 parts by weight and the amount of aluminum fiber added exceeds 5.0 parts by weight, it is difficult to disperse the L-shaped conductive additive. As a result, the stability of the latex is impaired, and the fibrous conductive additive added during backing processing cannot be reproducibly produced as a product due to the fibrous conductive additive added to the roller. Additives are 4 quintillion) (less than 1 part will have sufficient effect)
This is a problem because the stability of the latex will be impaired if it exceeds 10 parts.

The latex contained in the electrosensitive composition of the present invention includes:
Styrene-butadiene latex, methyl methacrylate-butadiene latex, acrylonitrile-
Synthetic rubber latex such as butadiene latex, polyisoprene latex, chloroprene latex, acrylic ester latex, urethane latex, vinyl acetate latex, ethylene-
Generally used for carpet processing such as vinyl acetate latex, ethylene-vinyl chloride latex, synthetic copolymer latex such as vinyl chloride latex, vinylidene chloride grass latex, polyethylene latex, natural rubber latex, etc. These latexes may be used singly or as a mixture.

Furthermore, if necessary, hardening agents, colorants, plasticizers,
11 agents, activators, fillers, etc. can be contained. Surrounding method for coating gray fabric with latex composition ← 11. Conventionally known methods, such as coating before use, etc., can also be used. A coating method using a coating machine is preferred. That is, the coating method differs from the conventional method in that sufficient antistatic properties can be obtained by using a method that is exactly the same as applying a conventional carpel adhesive.

The present invention will be explained below with reference to Examples. The antistatic performance in the examples was evaluated by the following method.

Volume resistivity: Using a super megohmmeter 5Ml0 type (Toa 1L Wave 5-4iLq), the carpets prepared in each of the -C1 Examples were heated at 20°C.
Immediately after being left in an atmosphere of 40% RH for 24 hours, the volume resistance was measured in the same atmosphere.

Human body electrostatic voltage: After drying the carpet for 1 liff at 70℃ 114<j, it was left in a test IFA room (20℃, 40cmRH) for 24 hours, and the human body electrostatic voltage was measured using the JISL1021 Stroll method. do.

Example 1 A thread of 1450 denier and 68 filament made of 100% nylon 66 was pressed to produce processed yarn (A), (A) alone or (A ) and antistatic thread nylon (belt Fcon 931
Using 120 denier, 3 filament, made by Kane SZ Tsu0 () (B), tufting was carried out using /8G tact technology, length 6 mm, number of stitches 16 per 5 cm, Tufted carpets with regular and antistatic yarns were obtained. This carpet was dyed with conventional acid dyes.

Latex for backing is chemical-free latex SB type L2
001 (Solid content) 100 parts, aoo part of CaC03 (SS #ao manufactured by Nitto Funka Kogyo ■), conductive filler (jf-: blending amount as described in Table 1), antifoaming agent (5H5561 manufactured by Tsukuri Resilicone Co., Ltd.) 0 .15 parts, dispersant (tripolyline r) (disodium) 0.5 parts, thickener, appropriate amount (Aron A-20F manufactured by Toagosei ■) were added, and the solid content was 7.
0% and a viscosity of 25,000 Cp" was used. 1.3 kg of the latex 6, carpella) lrn' was applied, and jute was used as the secondary base fabric, and it was dried with hot air at 135°C for 15 minutes. Volume resistance and human body electrostatic potential were measured using the carpet made in this way.The results were 0, as shown in Table 1, and the latex for conductive backing according to the present invention was coated. It is clear that this carpet has superior antistatic properties.

Example 2 A conductive additive was added to the carpet used in Example 1 using aluminum fiber (Tokyo Rope IAa>
'j-'4 Tuff Mic Fiber length 51u
1 diameter 30 μ) and carbon black (Ketjen black manufactured by Lion) were evaluated.The results are shown in Table 2. It is clear that the FL property is superior.

Claims (1)

[Scope of Claims] L: A carpet with excellent antistatic performance obtained by simultaneously containing a fibrous conductive additive and a granular conductive additive in the backing layer of a carpet made of synthetic fibers.Z: FaML-like conductive additive is an aspect. Ratio 102~5X103, fiber length 1
Patent iii' ■ Scope 1 which is carbon fiber of 0n or less
Carpet 3 with excellent antistatic performance as described in Section 3, the fibrous conductive additive has an aspect ratio of 90 to 500
A carpet 46 with excellent antistatic performance according to claim 1 of the invention claimed in Patent No. 511J, which is aluminum fiber with a fiber length of 10 ms or less.A carpet 46 with excellent antistatic performance according to claim 1, wherein the granular conductive additive is carbon black. Carpet with excellent antistatic performance