JPS6114264B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is a blended yarn knitted fabric with excellent antistatic properties, especially a blended fabric that has the excellent gloss, texture, dyeability, and mechanical properties of polyamide fibers, and prevents static charging in a low-humidity atmosphere. Regarding yarn knitted fabrics. Traditionally, polyamide fibers have a low Young's modulus and lack the stiffness of a fabric, despite having many features such as silk-like luster, easy dyeing, and hygroscopicity in addition to excellent mechanical properties. Due to its poor acid resistance, as well as the fact that it easily gets charged and causes problems due to static electricity, which is a common drawback of synthetic fibers, many improvements are desired not only for outer clothing, but also for inner clothing such as underwear and socks. was. Polyamide fibers with improved charging properties are produced by treatment with antistatic agents such as various surfactants, as well as by mixing or copolymerizing a third component such as polyalkylene oxide, which imparts antistatic properties to the fibers themselves. Fibers made of improved polyamide polymers have been proposed, but the former has poor antistatic properties and durability, and the latter loses the aforementioned features of polyamide fibers, so they do not necessarily meet practical requirements. It could not be said that the characteristics were satisfied. Furthermore, not only these antistatic polyamide fibers but also conventional antistatic synthetic fibers, with the exception of fibers blended with or coated with conductive powder such as carbon black, cannot be used in relatively high humidity environments. Although it shows a certain level of antistatic or antistatic effect, it is said that it does not exhibit sufficient antistatic properties under low humidity conditions, especially at humidity conditions lower than 20°C and 30% RH. In view of the above-mentioned current situation, the present inventors have conducted extensive studies on knitted and woven fabric products that take advantage of the excellent features of polyamide fibers and prevent their electrostatic properties, and have discovered the present invention. That is, an object of the present invention is to provide an antistatic mixed yarn knitted fabric that reflects the features of polyamide fibers and improves its disadvantages of dimensional stability and wrinkle resistance. The other purpose is to maintain the appearance, feel (flexibility, drapability, resilience, elasticity), luster, etc. inherent to polyamide fibers, and to achieve a high degree of semi-permanence in low-humidity environments, which cannot be achieved with polyamide fibers alone. An object of the present invention is to provide an antistatic mixed yarn knitted fabric having antistatic properties. The object of the present invention is, as stated in the above claims, to
Modified polyethylene terephthalate or polyethylene, which has an electrical resistivity of 10 ¹² Ω/cm or less under the same temperature and humidity conditions, is added to the filament yarn, which has an electrical resistivity of 10 ¹⁰ Ω/cm or more and has the characteristics of a polyamide fiber. (Ethylene tele/Isophthalate) filament yarn at 20℃ and 30%RH.
This can be achieved by using a mixed yarn knitted fabric with a frictional charging voltage of 3000 volts or less. The polyamide filament yarn constituting the blended yarn of the present invention has silk-like luster (appearance), texture (feel), dyeability, and hygroscopicity, which are characteristics of polyamide fibers, and has electrical resistivity. is at least
10 ¹⁰ It is a filament yarn with excellent mechanical properties obtained from the above-mentioned polyamide copolymer containing nylon 6,66 and hexamethylene terephthalamide or isophthalamide as copolymer components, and has antistatic properties. There is no need to have one. However, the polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) filament yarn mixed with this polyamide filament yarn has an electrical resistivity of 10 ¹² Ω・cm or less under the above-mentioned temperature and humidity atmosphere. By blending polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) filament yarns that have such specific electrical resistance, we can create a blended fiber that exhibits sufficient antistatic properties even in a low-humidity atmosphere. This makes it possible to create yarn-knitted fabrics. Examples of the conductive polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) filament yarn include conductive polyester composites having a core component or coating of a polymer component containing conductive fine powder such as carbon black. Although fibers or coated fibers are known, such conductive fibers are unsuitable as a mixed yarn knitted fabric material for the purpose of the present invention because of their poor mechanical properties and significant coloration. be. That is, the polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) filament yarn used in the present invention has a strength of at least
2.5g/d, Young's modulus is 60g/d or more, elongation is 60%
It is necessary to maintain the characteristics of polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) fibers, which have the following properties and a boiling water shrinkage rate of 20% or less. Only by using (ethylene tele/isophthalate) filament yarn can it be possible to prevent the electrostatic properties of polyamide filament yarn and improve its dimensional stability, wrinkle resistance, etc. In other words, one of the features of the present invention is that a multifilament yarn obtained from known antistatic polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) is used to prevent static electricity on polyamide filament yarn. . Especially when modified with polyalkylene oxide, the electrical resistivity is 10 ⁷ to 10 ¹¹
Filament yarn of Ω cm is preferred. That is,
Even when mixed with outstanding antistatic polyamide fibers that have a conventional electrical resistivity of 10 ⁸ Ω・cm or less, the temperature at 20°C and 30% RH
Although it is not possible to obtain a fabric that exhibits a frictional charging voltage of ³⁰⁰⁰ volts or less in an atmosphere of By doing so, it is possible to easily obtain a mixed yarn knitted fabric having a frictional charging voltage of 3000 volts or less in the low-humidity atmosphere. Here, the frictional charging voltage of the present invention is JIS-L1094-
This value is measured according to the measurement method specified in 1980. In addition, the electrical resistivity is KAWAGUCHI・
Model VE-40 made by ELECTRIC WORKS,
This is a value measured using a GIGA・OHM・meter. The mixing ratio of polyamide filament yarn and polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) filament yarn constituting the mixed yarn of the present invention is such that the frictional charging voltage of the resulting mixed yarn or knitted fabric thereof is 20 The fibers are mixed so that the voltage is 3,000 volts or less at ℃ and 30%RH.From the viewpoint of antistatic properties of mixed yarn knitted fabrics, the proportion of polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) filament yarns should be adjusted. It is preferable to increase the number. However, when the blending ratio of polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) filament yarn increases, the characteristics of the polyamide fiber knitted fabric are difficult to be reflected in the resulting mixed yarn knitted fabric. The yarn is preferably composed of polyamide filament yarn in an amount of 30% to 70% by weight based on the weight of the mixed yarn. Furthermore, for the filament yarn components of polyamide and polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) constituting this mixed fiber yarn, it is preferable to select one in which the shrinkage rate of the former polyamide filament yarn is smaller than that of the latter.
By providing such a shrinkage difference, it is possible to create a mixed yarn knitted fabric that more clearly reflects the characteristics of polyamide fibers, and it is also possible to create a blend of polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) filament yarn. The fiber ratio can be increased, and it is possible to improve not only antistatic properties but also dimensional stability, wrinkle resistance, heat setting properties, etc., which are disadvantages of polyamide fibers. From this point of view, the difference in shrinkage rate between polyamide filament yarn and polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) filament yarn can be determined by treating it in boiling water for 30 minutes, drying it, and then treating it at 180°C for 3 minutes. The content should be in the range of 2 to 10%, preferably 4 to 7%. As mentioned above, the knitted fabric of the present invention can be made using a relatively easy manufacturing method, and has not only permanent and high antistatic properties, but also has excellent flexibility, drapability, resilience, dimensional stability, and bulkiness. It also has secondary effects such as wrinkle resistance. The present invention will be explained below with reference to Examples. Example 1 A nylon 6 thread of 50 denier (hereinafter abbreviated as D) and 17 filament (hereinafter abbreviated as F) with an electrical specific resistance of 10 ¹² Ω・cm or more and an electrical resistivity of 1.8×10 ¹⁰
In Ωcm, strength 4.5g/d, elongation 36%, Young's modulus
Antistatic polyethylene terephthalate yarns of 50D/18F with a boiling yield of 89g/d and 7% were drawn together and mixed using a normal compressed air turbulent jet nozzle to form a mixed fiber yarn (100D/35F). I made it. For comparison, we used a yarn (100D/34F) in which only 6 nylon yarns were mixed together in two yarns (100D/34F) and a mixed yarn (100D/36F) in which only two yarns of the same polyethylene terephthalate yarn were aligned. I made it. A jersey with the same structure was knitted using each of these mixed fiber yarns. Each knitted fabric was relaxed in hot water, dried, and set in a baking machine at 180°C for 30 seconds. After each knitted fabric was uniformly dyed with disperse dye, it was finished and set again at 180°C. For each of the obtained knitted fabrics, 20℃・30%RH
The frictional charging voltage with cotton cloth was measured, and the results shown in Table 1 were obtained.

[Table] From Table 1, it can be seen that the frictional charging voltage of the knitted fabric of the invention example is extremely low despite being under low humidity conditions, and its feel is also excellent. In the comparative example, the knitted fabric made only of polyamide yarn had a very high charging voltage and an unfavorable texture. It can be seen that although the knitted fabric made from polyethylene terephthalate yarn has a low electrostatic voltage as expected, it is still higher than the knitted fabric of the example of the present invention. Although the same polyethylene terephthalate yarn is used, it is an unexpected and surprising effect that the knitted fabric of the present invention, which is obtained from a blended yarn with polyamide yarn that does not have antistatic properties, has high antistatic properties. . Furthermore, the knitted fabric of the present invention was washed in a household two-tank electric washing machine, using household detergent (concentration 1.5 g/), bath ratio 1:30, bath temperature 40°C, and strong inversion for 15 minutes. One cycle of washing consisted of washing, dehydrating for 60 seconds, rinsing under running water for 5 minutes, dehydrating for 60 seconds, and air drying. When the charging voltage was measured after 10 cycles of washing, the frictional charging voltage under the same conditions was 2.0 kV, and the antistatic performance did not deteriorate at all. Example 2 Using poly(ethylene tele/isophthalate), which is a copolymerization of polyamide with nylon 6 and polyester with 10 mol% isophthalate, both polymers were supplied to separate hoppers of a composite spinning machine, and separate hoppers of the same spinneret were used. The yarn was spun out of the discharge hole to create a mixed fiber yarn at once. During spinning, an appropriate amount of polyethylene oxide-based antistatic agent is blended with the above copolyester to create a mixed fiber yarn of poly(ethylene tele/isophthalate) yarn (A) and polyamide-based yarn (B) with different electrical resistivities. Obtained. At this time, mixed yarns with different mixing ratios were also produced by changing the discharge amounts of both component polymers and the nozzles used. The fineness, number of filaments, and electrical resistivity (A) of these mixed yarns were measured and shown in Table 2.
The electrical resistivity in (B) is outside the capability of the measuring instrument (10 ¹⁶ Ω・
cm). A 27G tubular knitted fabric was made using this blended yarn. The knitted fabric is refined at 80℃ under relaxation,
After thoroughly washing with water and air drying, the temperature was set at 180°C. As in Example 1, the frictional charging voltage of this knitted fabric was measured and shown in Table 2 along with the qualitative feel, and the overall evaluation was entered. In addition, since it is a mixed fiber yarn, the electrical resistivity is measured using a separate yarn spun under the same conditions, and the yarn strength of (A) is measured by dividing the mixed yarn, and each yarn is 3.2 g. /
It was confirmed that the value was d or higher. Furthermore, the knitted fabric was unknitted, and a difference in heat shrinkage rate of 4.5% or more was observed between the two fabrics based on the difference in yarn length.

[Table] As is clear from Table 2, all of the knitted fabrics of the invention examples have a frictional charging voltage of 3 kV or less and a good texture, but the comparative examples have too high a charging voltage and a poor texture. I know it's not good. Example 3 Polyethylene terephthalate yarn with 50D/24F trilobal cross section and nylon 6 with 40D/13F trilobal cross section with electrical resistivity of 1.5 x 10 ¹⁰ Ωcm at 20°C and 30% RH. A mixed fiber yarn (90D/37F) was made by applying air pressure treatment to the yarn. Taffeta was woven using this mixed yarn as the warp yarn, and a mixed yarn of different conductive fibers listed in Table 3 as the weft yarn, but having the same fineness and number of filaments as the warp yarn. The conductive polyethylene terephthalate yarn used here had a strength of 4.6 g/d, an elongation of 35%, a Young's modulus of 92 g/d, and a boiling yield of 8%. This taffeta is relaxed in hot water and 180%
After medium heat setting in a baking machine at 100°C, dyeing with acid dye and scouring wash. After drying
A blue heathered fabric was obtained by finishing and setting at 180°C. The frictional charging voltage of each fabric having different weft yarns was measured under the same conditions as in Example 1, and is shown in Table 3. As is clear from Table 3, the charging voltage of the textile is
It can be seen that whether or not the polyamide yarn is antistatic, it is largely dependent on the antistatic performance of the polyethylene terephthalate yarn, and that its antistatic properties are excellent and high.

【table】

Claims (1)

[Claims] 1. A polyamide filament yarn having an electrical resistivity of at least 10 ¹⁰ Ω·cm at 20°C and 30% RH and an electrical resistivity of 10 ¹² Ω·cm under the temperature and humidity conditions.
Consists of a blended yarn in which the following polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) multifilament yarn is blended at 30% to 70% by weight based on the weight of the blended yarn, and at 20℃ and 30%
An antistatic mixed yarn knitted fabric with a frictional charging voltage of 3000 volts or less at RH. 2 Multifilament yarn of polyethylene terephthalate or poly(ethylene terephthalate/isophthalate) with a strength of at least 2.5 g/d and 60 g/d
The antistatic mixed yarn knitted fabric according to claim 1, which has a Young's modulus of d or more and a boiling water shrinkage rate of 20% or less.