JPS6034058Y2 - antistatic sewing thread - Google Patents

Description

[Detailed description of the invention] This invention relates to a sewing thread with good antistatic properties (antistatic properties).

When clothing, especially clothing made of non-hydrophilic fibers, is worn in winter or other low-humidity environmental conditions, static electricity is generated due to friction between the human body and the clothing, and between clothing and clothing. It is well known that storing electricity in a device causes various electrostatic problems.

Attempts have also been made to make clothing fabrics antistatic as a means of preventing static electricity generation in clothing.

In this method, the cloth, its constituent threads, and fibers are subjected to some kind of processing, so there are various restrictions on the use of the cloth, and the disadvantage is that it cannot be used for any type of clothing.

Furthermore, a method has been proposed for preventing electrostatic damage to clothing by making sewing thread antistatic.

For example, as shown in Japanese Utility Model Publication No. 50-41308, sewing thread mixed with conductive fibers made by adhering metal or conductive fine powder to the surface of organic fibers, or
For example, as shown in Japanese Utility Model Application No. 50-45454, spun sewing thread containing 0.25 to 10% of stainless steel short fibers is known.

However, these methods also have the disadvantage that the metal powder adhered to the surface of the conductive fibers is rubbed off by sewing machine needles and falls off during use as sewing thread.
However, due to the high hardness of stainless steel, it has the disadvantage of wearing out sewing needles and damaging the blades of sewing scissors, as well as reducing the flexibility of sewing thread.

The object of this invention is to eliminate the drawbacks of the prior art and provide a sewing thread that provides antistatic properties to clothing.

This invention consists of a fiber-forming polymer in which conductive linear polymers containing carbon grains are dispersed in a plurality of stripes in the direction of the fibers. It is an antistatic sewing thread containing 1% by weight to 2% by weight of short fibrous conductive organic fibers with a diameter of 10 to ICPΩ·even.

The organic conductive fiber used in this invention is a fiber-forming acrylonitrile polymer in which a substantially conductive linear polymer containing carbon black, such as a polyalkylene glycol derivative, is added in the fiber axial direction. A conductive organic synthetic fiber mixed and spun using a solution spinning method such that a plurality of fibers are dispersed in the fiber, and the electrical resistivity at 20°C and 30% RH is 1CPΩ・0 or less, preferably 103Ω・0 or less. 1
It is a fiber of up to 00Ω.

An example of a method for manufacturing such an organic conductive fiber is shown below.

That is, while stirring a solvent solution of the polyalkylene glycol derivative (for example, polyalkylene glycol grafted with acrylonitrile) using a mixer, carbon black is gradually added and mixed.

Next, this solution and a separately prepared solvent solution of polyacrylonitrile are mixed in a mixer to prepare a spinning dope.

The solvent used is preferably a common solvent for both polyalkylene glycol derivatives and polyacrylonitrile.

Examples include dimethylformamide and dimethylsulfoxide.

Care should be taken here to select the types of both polymers and solvents and their combination so that carbon black is not dispersed in the polyacrylonitrile side.

The obtained spinning dope is discharged from a spinneret into a coagulation chamber by conventional means.

The threads coagulated in the coagulation bath are made into fibers through processes such as drawing, washing with water, and drying and densification.

In this case, it is preferable to draw the coagulated yarn at a ratio of at least 3 times.

The coagulation bath may be any coagulable liquid of the spinning dope, but usually a mixed solvent of a good solvent and a poor solvent for the polymer is used.

In such organic conductive fibers, the conductive substance carbon black is dispersed in the fibers, so the carbon black does not fall off even when subjected to external friction or washing, and the antistatic effect is durable. It has excellent characteristics.

Furthermore, unlike those made of stainless steel, it has almost the same physical properties as ordinary synthetic fibers, so even if it is mixed into sewing thread, it will not wear out the blades of sewing machine needles or sewing scissors.

Figure 1 shows the dispersion state of carbon grains in the organic conductive fiber used in this invention, and is an enlarged view illustrating the state of linear polymer B containing carbon grains C in fiber-forming polymer A. FIG.

As shown in this figure, carbon grain C is mostly present in the fibers and is dispersed in the form of stripes along the fiber axis, so that it acts as a bark for highly conductive organic fibers.

If 100% of the organic conductive fiber of this invention is used to make a sewing thread, of course a sewing thread with sufficiently high conductivity can be obtained, but the strength as a sewing thread is not sufficient.

Therefore, in this invention, fibers normally used as sewing threads, such as cotton, polyester, nylon, porvinyl alcohol, rayon, etc., or blends of these,
By mixing this organic conductive fiber into the intersecting thread, all the characteristics of a sewing thread (for example, strength, Young's modulus, flexibility, pliability, shrinkability, color washability, and hue expression range) can be achieved. etc.) at a satisfactory level and has a high antistatic property.

FIG. 2 is an enlarged perspective view of an example of a sewing thread, and shows an example of a sewing thread in which a blended yarn of non-conductive ordinary fibers A' and organic conductive fibers B' is twisted together. '' is not limited to blended yarns, but may also be the blended yarns mixed with yarns of ordinary materials.

Effective antistatic properties cannot be exhibited unless the mixing ratio of organic conductive fibers to the total amount of sewing thread is 1% or more.

Furthermore, even if 20% or more is mixed in, not only will no further antistatic effect appear, but the hue of the sewing thread may darken.
Since negative factors such as a decrease in strength will increase, the mixing ratio of organic conductive fibers should be in the range of 1% to 20%.

Clothes sewn using the sewing thread of this invention exhibit excellent electrostatic spinnability as a whole.

Of course, it is necessary to use more than a certain amount of the sewing thread of this invention in the entire garment, but the rough guideline for this required amount is the amount of organic conductive fiber in the sewing thread of this invention for the entire garment. The weight percentage is 0.1% or more.

Clothes sewn in this manner have antistatic properties as a whole, even if the garment fabric is not specially subjected to charging treatment.

Figure 3 shows the sewing thread of this invention (polyester stable 9
0% and 10% of the organic conductive fibers)
is sewn at various intervals (from 10 cm to 0.5 cm), and is a graph showing the relationship between the mixing ratio of organic conductive fibers to the entire cloth and the frictional charging voltage of the cloth.

From Figure 3, if 0.1% or more of conductive fiber is mixed with the total amount of cloth, the frictional voltage of the cloth (in this case, 20
℃, 30% RH, cotton target cloth) was 3000V or less, indicating that it can exhibit antistatic effect as clothing.

Generally, the weight ratio of sewing thread used per garment is 0.
．． Since it is about 5% to 10%, in combination with the proportion of organic conductive fibers in the sewing thread of this invention, it is necessary to select conditions such that the conductive fibers account for 0.1% or more of the entire garment.

[Brief Description of the Drawings] Figure 1 is an explanatory diagram of the organic conductive fiber used in this invention, Figure 2 is an enlarged view showing an example of the sewing thread of this invention, and Figure 3 is an illustration of the organic conductive fiber of the polyester cloth. It is a graph showing the relationship between the proportion of fibers mixed in by sewing and the frictional charging voltage of the sewn cloth. A: fiber-forming polymer, B: linear polymer, C: carbon black, A' normal fiber, B': organic conductive fiber.

Claims (1)

[Scope of utility model registration request] A fiber-forming acrylonitrile-based polymer containing a conductive linear polymer containing carbon grains is dispersed in a plurality of stripes in the fiber axis direction.The electrical resistivity at 20°C and 30% RH is 10. An antistatic sewing thread containing 1% by weight to 2% by weight of short fibrous conductive organic fibers of ~1σΩ·a.