JPH07166470A - Production of antistatic water-repellent knitted fabric - Google Patents

Abstract

PURPOSE:To obtain antistatic water-repellent knitted fabric having excellent appearance and improved water-repellent performance. CONSTITUTION:Yarn (yarn A in short) comprising non-conductive synthetic yarn having <5 denier fineness and <=15% shrinkage percentage in hot water is prepared. On the other hand, yarn comprising electrically-conductive yarn (yarn B in short) having <15 denier fineness and <=10% shrinkage percentage in hot water is prepared. Both the yarns are used and knitted by plaiting knitting in such a way that the yarn A is positioned on the surface side and the yarn B is placed on the back side. In the knitting, the weight ratio of the yarn A is 60.0-99.8wt.% and that of the yarn B is 0.2-40.0wt.%. The prepared knitted fabric, for example, is dyed and processed and provided with a water repellent. Since gray or black electrically-conductive yarn is arranged inside the yarn A, appearance on the surface of the prepared knitted fabric is hardly damaged and the surface of the knitted fabric is uniformly provided with the water repellent. The knitted yarn can be semipermanently provided with antistatic properties.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an antistatic water repellent knitted fabric which can be suitably used for clothes or clothing materials, and particularly has an excellent antistatic property and water repellency. The present invention relates to a method for producing a water-repellent knitted fabric.

[0002]

2. Description of the Related Art A knitted fabric made of synthetic fibers is prone to electrostatic damage due to friction between the fibers. Therefore, a method of applying an antistatic agent during dyeing of a knitted fabric is commonly used. However, the antistatic effect of this method is not permanent, and generally its performance is deteriorated by repeated washing, and after repeated washing for about 30 times, the antistatic agent attached to the fibers falls off. , Its antistatic effect disappears. On the other hand, in order to impart water repellency to a knitted fabric using synthetic fibers, generally, in the final finishing step of the dyeing process, a water repellent such as a fluorine-based or silicone-based agent is applied to the knitted fabric, and the dry heat treatment is performed. Is being done.

Thus, the so-called antistatic treatment and water repellent treatment of the post-processed products, which are carried out in the dyeing process, are usually carried out individually according to the purpose, and the antistatic property ( To have both antistatic property and water repellency,
Generally not done. This is because the surface of the knitted fabric must have good hygroscopicity in order to enhance the antistatic effect, and the water repellent treatment reduces the hygroscopicity. That is, a knitted fabric having both antistatic property and water repellency by using an antistatic agent and a water repellent has not been put to practical use.

For this reason, a method has been proposed in which a conductive fiber is used without using an antistatic agent, and a water repellent is added to a knitted fabric containing a small amount of the conductive fiber in a dyeing process. According to this method, it is considered that a knitted fabric having both high antistatic property and water repellency can be obtained. This is because the conductive fiber is used in place of the antistatic agent, so that the antistatic agent does not fall off due to repeated washing, and high-performance antistatic property can be exhibited. Further, since the conductive fiber is used, good antistatic property is exhibited regardless of the property of the knitted fabric surface, that is, even if the knitted fabric surface is water repellent.

However, the conductive fiber is generally obtained by kneading carbon fine particles or carbon black fine particles into the fiber and is colored gray or black, so that it is mixed with other fibers or other yarns. When the knitting is performed, the conductive fiber itself is colored, whereby a streak-like or heather-like pattern appears on the knitted fabric, which impairs the appearance. Further, the adhesion of the water repellent agent to the conductive fibers is less likely to adhere than the adhesion of the water repellent agent to other general synthetic fibers, or even if adhered, it is likely to fall off. Therefore, the surface of the knitted fabric becomes non-uniform in water repellency, and it is difficult to realize good water repellency as a whole. Furthermore, since the fineness of the conductive fibers is larger than that of synthetic fibers generally used, when mixed with synthetic fibers or knitted with synthetic fiber yarns, the texture of the obtained knitted fabric is lowered. There was also the drawback of doing so.

[0006]

Therefore, the present invention uses a generally used yarn made of non-conductive synthetic fibers and yarn made of conductive fibers to knit a knitted fabric by splicing. By doing so, the yarn made of the conductive fiber is positioned inside the stitch, and the conductive fiber is prevented from being exposed on the surface of the knitted fabric, thereby preventing the appearance from being damaged by the coloring of the conductive fiber. Provides a knitted fabric having both high performance water repellency and high performance anti-static property while preventing the deterioration of the adhesion of the water repellent on the surface of the knitted fabric and further preventing the deterioration of the feel of the knitted fabric surface. It is to try.

[0007]

That is, according to the present invention, the fineness is
A yarn made of non-conductive synthetic fibers having a hot water shrinkage of less than 5 denier and 15% or less (hereinafter referred to as "A yarn").
And a yarn made of conductive fibers having a fineness of less than 15 denier and a hot water shrinkage ratio of 10% or less (hereinafter referred to as “B yarn”), the A yarn is made to be the front side by splicing. Position it, B
The yarn is positioned on the back side, and the weight ratio of the A yarn is 60.0 to 99.8 wt% and the weight ratio of the B yarn is 0.2 to 40.
The present invention relates to a method for producing an antistatic water-repellent knitted fabric, which comprises knitting so that the content is 0% by weight, and a water-repellent agent is added to the obtained knitted fabric.

The yarn A used in the present invention is a yarn made of non-conductive synthetic fibers having a fineness of less than 5 denier and a hot water shrinkage of 15% or less. As the non-conductive synthetic fibers, polyester fibers, polyamide fibers, polyolefin fibers, polyacrylonitr fibers, etc., which have been generally used for clothing or the like, are used. That is, the non-conductive synthetic fibers referred to in the present invention are only those used to distinguish from the other conductive fibers, and are synthetic fibers that have been conventionally used for clothing and the like. It just means that. As the yarn, a multifilament yarn, spun yarn or the like is used. In particular, as the form of the multifilament yarn, a conventionally known form is used, but for example, a false twisted false twisted yarn, a knit / de / knit processed yarn, an air treated yarn, etc. Used.

In the present invention, the fineness of the non-conductive synthetic fiber is less than 5 denier. When the fineness exceeds 5 denier,
The texture of the obtained knitted fabric becomes coarse and hard, which is not preferable. The hot water shrinkage of the non-conductive synthetic fiber is 15% or less.
When the hot water shrinkage exceeds 15%, when the knitted fabric is subjected to dyeing processing, etc., the knitted fabric undergoes high shrinkage because it is placed under high temperature, causing wrinkles on the knitted fabric surface, Alternatively, it is difficult to obtain the desired properties, which is not preferable. Also, when the hot water shrinkage of the non-conductive synthetic fiber exceeds 15%,
The hot water shrinkage rate becomes too large as compared with the conductive fiber, and the conductive fiber positioned inside by the splicing knitting may be exposed on the knitted fabric surface, which is not preferable. Here, the method of measuring the hot water shrinkage ratio is as follows. That is, once fixing the fiber, apply an initial load of 1/10 (g / d) to the other end, measure 500 mm correctly and mark 2 points. Then, after taking an initial load and immersing it in boiling water for 30 minutes, it is taken out, lightly drained with absorbent paper or cloth, and naturally dried in a horizontal state. After that, the initial load is applied again, and the length between the two points is set to lmm. The above lmm measurement is performed 10 times each, and the shrinkage rate is calculated by the formula [(500-l) / 500] × 100, and the average value is used as the hot water shrinkage rate (%).

The B yarn used in the present invention is composed of conductive fibers having a fineness of less than 15 denier and a hot water shrinkage of 10% or less. As the conductive fiber, various conventionally known ones can be used, for example, metal fiber, carbon fiber,
A thermoplastic fiber containing conductive fine particles, a core-sheath type composite thermoplastic fiber containing conductive fine particles in the core portion and no conductive fine particles in the sheath portion, and the like can be used. The electric resistance value of these conductive fibers is generally 1 × 10 ⁹ Ω / cm or less. As the B yarn, a multifilament yarn, a spun yarn or the like is used. As the form of the multifilament yarn, a conventionally known form is used as in the case of the A yarn. For example, false twisted false twisted yarn, knit de knit processed yarn, Air-processed yarn or the like is used.

The fineness of the conductive fibers is less than 15 denier. When the fineness is more than 15 denier, when knitting with a splicing yarn, the conductive fibers to be located inside protrude to the outside, or the texture of the obtained knitted fabric becomes coarse and hard, which is not preferable. The hot water shrinkage of the conductive fiber is 10% or less. If the hot water shrinkage exceeds 10%, when the knitted fabric is subjected to dyeing processing, etc., the knitted fabric undergoes high shrinkage because it is placed under high temperature, causing wrinkles on the knitted fabric surface, Alternatively, it is difficult to obtain the desired properties, which is not preferable. The method of measuring the hot water shrinkage of the conductive fiber is the same as the method of measuring the hot water shrinkage of the non-conductive synthetic fiber described above.

Next, using the above-mentioned A yarn and B yarn,
Knitting is performed with the added yarn so that the A yarn is on the front side and the B yarn is on the back side (the inside of the stitch formed by the A yarn). By knitting with the added yarn, the A yarns are uniformly arranged on the front side and the B yarns are uniformly arranged on the back side. Specifically, in order to knit with added yarn knitting, the A yarn and the B yarn are separately and regularly arranged in the two-hole yarn feeder of the knitting machine so that the tension of the yarn and the entering angle of the yarn with respect to the knitting needle are made uniform. Do it. As the design of the splicing knit, a design such as a mock rodie, a mock Milano rib, a Milano rib, a double picket, and a tack reversible, which are a combination of double-sided knitting and flat knitting, is preferably used. The B yarn is preferably fed to the flat knitting portion.

A specific method of splicing yarn is carried out, for example, by using the yarn feeder shown in FIG. In FIG. 2, 1, 2
Indicates a yarn supplying yarn, and α and β indicate yarn supplying holes. When the B yarn is knitted inside the surface of the knitted fabric, 1 is used to feed the yarn into the yarn feeding hole β using the B yarn and 2 is used to feed into the yarn feeding hole α using the A yarn. Good. When knitting the B yarn inside the back surface of the knitted fabric, the A yarn is used for 1
The yarn may be fed to the yarn feeding device, and the B yarns may be used to feed the yarn to the yarn feeding hole α. Further, as the knitting structure of the added yarn knitting, for example, the structure shown in FIG. 1 can be adopted. FIG. 1 schematically shows the stitches, in which the solid line portion is the A yarn yarn and the broken line portion is the B yarn yarn. In FIG. 1, using the yarn stitches on 2F and 7F, B
We are supplying yarn.

When the A yarn and the B yarn are simply aligned and knitted without knitting with the added yarn as in the present invention, a reversal phenomenon occurs and the A yarn is uniformly arranged on the front side. It is difficult to do so, which is not preferable. In addition, a method of using the B yarn independently and using it for knots on both sides of the knitted fabric by both tuck knitting, and knitting inside the knitted fabric, or inserting into the knitted fabric by the inlay method, etc. Depending on the method, it may be possible to adopt a method in which the B yarn does not appear on the front side of the knitted fabric. It was a thing. That is, in these cases, in the knitted state of the knitted fabric, the B yarns are knitted in the knitted fabric, but when the dyeing process is performed, the B yarns made of the conductive fibers are formed on the surface of the knitted fabric. It jumps out. The reason for this is that, when knitting with both tucks, the only joining point of the B yarns is the tuck point, and the remaining sinker loops are easy to move. On the other hand, even when the inlay method is used, the B yarns This is because the B thread is easy to move because there is no joint point with. On the contrary,
When the B yarn is arranged inside the stitch of the A yarn by the added yarn, the B yarn is covered by the A yarn, the B yarn is hard to move, and the B yarn is It is hard to jump to the front side.

When the knitted fabric is knitted by the splicing yarn, the weight ratio of both yarns is such that the A yarn is 60 to 99.8% by weight and the B yarn is 0.2 to 40% by weight. . When the weight ratio of the A yarn is less than 60% by weight, a reversal phenomenon occurs during knitting of the added yarn or a knitting defect occurs, which makes it difficult to obtain a desired knitted fabric, which is not preferable. The weight ratio of the A thread is
When it exceeds 99.8% by weight, good antistatic property cannot be obtained, which is not preferable. On the other hand, when the weight ratio of the B yarn exceeds 40% by weight, the ratio of the conductive fiber having a relatively high rigidity becomes high, so that the texture becomes coarse and hard, or the conductive fiber is colored black or the like. If you choose
The obtained knitted fabric becomes grayish and it is difficult to realize a desired hue, which is not preferable. Weight ratio of B yarn is 0.2
If it is less than wt%, good antistatic property cannot be imparted, which is not preferable.

In many cases, the knitted fabric obtained by the above-mentioned method is subjected to a conventionally known dyeing process. During this dyeing process, the knitted fabric is placed under high temperature and therefore shrinks. In the present invention, the non-conductive synthetic fiber constituting the A yarn has a hot water shrinkage of 15% or less, and the conductive fiber constituting the B yarn has a hot water shrinkage of 10% or less. Because it has become
It is possible to prevent the B yarn from jumping to the surface of the knitted fabric due to the contraction of the yarn. Therefore, in the present invention, no problem occurs even if the dyeing process is performed at a high temperature, and the shrinking process may be performed by special heating.

Further, the knitted fabric is subjected to water repellent finish. The water repellent treatment may be performed simultaneously with the dyeing treatment when the dyeing treatment is performed, or may be performed separately (for example, after the dyeing treatment). When the shrinking process is performed, the shrinking process may be performed simultaneously with the shrinking process or separately (for example, after the shrinking process). This water repellent treatment is performed using a conventionally known water repellent agent. That is, a fluorine-based water repellent containing polytetrafluoroethylene, perfluorooctyl acrylate, etc. as a main component, a silicone water repellent containing dimethylpolysiloxane, methylhydroxysilosan, etc. as a main component,
A pyridinium salt-based water repellent such as stearamidomethylpyridinium chloride or octadecyloxymethylpyridinium chloride, an ethyleneurea-based water repellent, or the like can be used. Among these, it is particularly preferable to use a fluorine-based water repellent containing polytetrafluoroethylene or perfluorooctyl acrylate as a main component because good water repellency can be obtained.

The water repellent treatment is generally carried out by using an aqueous solution in which a water repellent is dispersed or dissolved in water, or a solvent solution in which a water repellent is dispersed or dissolved in a solvent such as perchlorethylene.
It is performed by giving it to the knitted fabric. As this aqueous solution or solvent solution, it is preferable to use one having good permeability to non-conductive synthetic fibers or conductive fibers. In particular,
When an aqueous solution is used, it is preferable to add a penetrant such as isopropyl alcohol, which does not reduce the water repellency, to the aqueous solution. As a method of applying the aqueous solution or the solvent solution, a known padding method, dipping method or the like can be adopted. When the padding method is adopted, 2 nip and 2 nip are used to improve the penetration of the water repellent in the aqueous solution and solvent solution.
It is preferable to use a method such as dipping. The amount of the water repellent attached to the knitted fabric is preferably about 0.5 to 10% by weight based on the weight of the knitted fabric. When the attached amount of the water repellent is 0.5% by weight or less, it tends to be difficult to obtain good water repellency. On the contrary, even if the amount of the water-repellent agent adhered exceeds 10% by weight, the improvement of the water-repellent property is saturated, and the further improvement of the water-repellent property cannot be expected. is there.

As described above, a knitted fabric having both high water repellency and high antistatic property can be obtained. Hereinafter, it will be described in more detail based on examples.

【Example】

Example As a yarn A, a false twisted yarn of polyester multifilament 75 denier / 36 filament was prepared. The fineness of the single filaments constituting this multifilament was 2.0 denier, and the hot water shrinkage rate was 6%. As the B thread, a multifilament 25 composed of a conductive core-sheath type composite fiber composed of a core portion and a sheath portion described below.
A denier / 2 filament was prepared. The fineness of the single filaments constituting this multifilament was 12.5 denier and the hot water shrinkage rate was 8%. The core of the conductive core-sheath composite fiber is titanium dioxide particles with a specific resistance of 5 Ω · cm.
65 parts by weight of stannic oxide-coated particles having a particle diameter of 0.2 μ and 35 parts by weight of polybutylene terephthalate having an intrinsic viscosity of 0.87 and a melting point of 235 ° C. are uniformly mixed. On the other hand, the sheath portion of the conductive core-sheath type composite fiber is obtained by copolymerizing 1 part by weight of ethylene terephthalate and 9 parts by weight of ethylene isophthalate, an intrinsic viscosity of 0.7.
1. Consists of 7.5% by weight of titanium dioxide pigment in a copolymer with a melting point of 231 ° C and a glass transition point of 65 ° C.

Using the yarns A and B described above, the knitted fabric was knitted by feeding yarns with the knitting structure shown in FIG. 1 and by the yarn feeding method shown below. That is, 1F, 3F, 4F, 5F, 6F, 8F, 9
Only the A thread was fed to F and 10F. On the other hand, 2F and 7F
2 to feed the A and B yarns to the yarn feeding hole β using the A yarn and the B feeding yarn α to the yarn feeding hole β using the yarn feeding port shown in FIG. Threaded As described above, the knitted fabric was knitted by the additional yarn knitting by the yarn feeding method. The above knitting was carried out using a double knitting machine LPJ-H type made by Fukuhara Seiki, and knitting with a shuttle diameter of 33 "and a gauge of 28G. In this case, the positional relationship of the B yarns in the knitted fabric is the A yarn on the back side of the knitted fabric. Inside the stitch line, and 2F and 7F
Since the yarn is fed in, it has a uniform arrangement like a fawn. The weight ratio of the A yarn and the B yarn in the knitted fabric was 95% by weight for the A yarn and 5% by weight for the B yarn.

The knitted fabric thus obtained was dyed by a commonly used dyeing processing method, washed with water and dried, and then subjected to water repellent processing by the following method. That is, Asahi Guard AG710
(Asahi Glass Co., Ltd., fluorine-based water repellent) 60g / l, isopropyl alcohol 50g / l immersed in a water bath, 2 nip 2 dip method, Asahi Guard AG710 to the fiber weight
2% by weight was applied and dried. The obtained antistatic water repellent knitted fabric had a width of 160 cm and a basis weight of 450 g / m. Further, as shown in Table 1, this antistatic water repellent knitted fabric had excellent antistatic properties and was highly water repellent.

Comparative Example In the Examples, 2F and 7F in which the A yarn and the B yarn are added are replaced with the A yarn and the B yarn, and a false twisted yarn of polyester multifilament 100 denier / 36 filament is used. A knitted fabric was knitted and dyed and water repellent processed in the same manner as in Example except that the yarn was fed by a usual method.
The resulting water repellent knitted fabric had a width of 160 cm and a basis weight of 450 g / m. The texture and water repellency of the water repellent knitted fabric were similar to those of the antistatic water repellent knitted fabric according to the example, but as shown in Table 1, the antistatic property was poor.

[0023]

[Table 1]

The evaluation method and measurement method of each item in Table 1 are as follows. 1) Charge amount: The charge amount is the tumbler method (JIS T-81
18). That is, the sample was put into a tumbler dryer in which a cotton cloth for rubbing was attached to the entire inner surface, and after operating at 60 ° C for 15 minutes, polyethylene gloves were put on the fingers and the sample was taken out, put into a Faraday cage, and put into a Faraday cage. Was measured. The charged charge amount was calculated from this potential by the following formula. That is, the amount of charge (coulomb) = [capacitor capacity (farad)] × [potential (volt)]
Is. Then, the charge amount is ranked in three levels,
◎, ○, × were assigned in the ascending order of the amount of charge. 2) Surface leakage resistance: The surface leakage resistance was obtained by gripping the both ends of the strip sample in the lengthwise direction with electrodes (grip interval was 1.5 cm) and using the following formula. That is, surface leakage resistance = measured voltage / current. However, the measurement voltage was set to 500 V in principle. Then, the values of the surface leakage resistance were ranked in three levels, and the order of ⊚, ◯, and × was ascending in the order of the surface leakage resistance. 3) Ash test: In the ash test, after rubbing the rubbing cotton cloth with the sample 10 times back and forth, the sample is brought closer to 4.5 cm above the cigarette ash. Then, the adhesion amount of ash was ranked in three stages, and the order of increasing adhesion amount was ◎, ○, ×. 4) HL: HL represents the number of times of washing, HL-0 is a sample without washing, HL-5 is 5 times washed with JIS L-0217 103 method, then washed once with hot water and dried, Humidified sample, also HL-50
Is a sample after 50 washes, and HL-100 is a sample after 100 washes. 5) Water-repellent performance: The water-repellent performance is a value measured according to the spray method (JIS L-1018).

[0025]

The antistatic water repellent knitted fabric obtained by the method according to the present invention described above has a conductive fiber inside the stitch of the A yarn made of a nonconductive synthetic fiber which is generally used. By arranging the stitches of the B yarn made of A to have a uniform surface appearance, it is as if the entire knitted fabric is composed of the A yarn made of the non-conductive synthetic fiber which is generally used. The effect of being visible and compensating for the gray or black defect of the conductive fiber constituting the B yarn, and preventing the appearance of the knitted fabric from being impaired is exerted. In particular, even when the knitted fabric is dyed into a light-colored hue, the gray or black color of the conductive fibers is unlikely to appear on the surface, and the appearance of the knitted fabric is less likely to be impaired.

Further, in the method according to the present invention, a water repellent is applied to a knitted fabric in which the stitches of the A yarns are located on the front side and the B yarns are located inside the stitches to impart water repellency. Since the processing is performed, the water repellent agent is likely to be uniformly attached to the surface of the knitted fabric, and a knitted fabric having uniform surface water repellency can be obtained. Because the yarn B is barely exposed on the surface of the knitted fabric, and the yarn A is uniformly exposed. Therefore, even when the yarn B is hard to attach the water repellent, This is because the water-repellent agent is evenly attached to the A yarn forming the surface of the knitted fabric.
Even when the B yarn having bad texture is used, the B yarn is barely exposed on the knitted fabric surface, and the A yarn is uniformly exposed. It is possible to prevent the deterioration of the quality.

Therefore, according to the present invention, both semipermanent antistatic property due to the conductive fiber and good water repellency that surface water repellency is uniform and high in performance are provided, and the texture is good. The effect that a favorable antistatic water repellent knitted fabric can be obtained is exhibited. Therefore, if the antistatic water repellent knitted fabric obtained by the method according to the present invention is used as sheets for the elderly, it is possible to prevent leakage of urine and prevention of static electricity that frequently occurs during the dry period. , Which can be preferably used.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a knitting structure used in the present invention.

FIG. 2 is a schematic view showing an example of a knitting method used in the present invention.

[Explanation of symbols] A A yarn B B yarn

Claims (1)

[Claims] 1. A yarn made of a non-conductive synthetic fiber having a fineness of less than 5 denier and a hot water shrinkage of 15% or less (hereinafter,
Say "A thread". ) And a conductive fiber having a fineness of less than 15 denier and a hot water shrinkage of 10% or less (hereinafter,
Say "B thread". ) And so that the A yarn is positioned on the front side and the B yarn is positioned on the back side by the splicing knitting, and the weight ratio of the A yarn is 60.0 to 99.8% by weight and the weight ratio of the B yarn is A method for producing an antistatic water repellent knitted fabric, which comprises knitting so as to be 0.2 to 40.0% by weight and adding a water repellent agent to the obtained knitted fabric.