JPH05331772A - Production of high-density knitted fabric - Google Patents

Abstract

PURPOSE:To provide the subject knitted fabric clear in hue and high in color fastness. CONSTITUTION:A knitted fabric containing polyamide conjugate fibers is treated with a polyamide swelling agent to effect densification, and the resulting densified fabric is impregnated with a resin virtually not subject to dissolution or decomposition by polyamide dissolving agent, setting the resin on the fabric followed by dissolving and removing the polyamide with a polyamide dissolving agent, thus affording the objective high-density knitted fabric.

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 a high-density woven or knitted fabric, and more particularly to a method for producing a high-density woven or knitted fabric containing no polyamide and having a clear hue and high dyeing fastness.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a high-density woven or knitted material, there is a method of using a fiber made of a polymer which shrinks by heat or a method of compounding a fiber of a polyamide etc. which shrinks by a swelling agent. The latter method was used for densification.

However, in this latter method, the polyamide remains on the fabric after the swelling and shrinking steps,
When dyed, there are drawbacks that the hue becomes unclear and the dyeing fastness becomes low.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a method for producing a high-density woven or knitted fabric having a clear hue and high dyeing fastness. ..

[0005]

That is, according to the present invention, a woven or knitted material containing a polyamide composite fiber is treated with a swelling agent for polyamide to densify it, and is not substantially dissolved or decomposed by a polyamide dissolution treating agent. A process for producing a high-density woven or knitted fabric, which comprises impregnating and fixing a resin, and then dissolving and removing the polyamide with a polyamide dissolving treatment agent.

As the polyamide conjugate fiber used in the present invention, a conjugate yarn of polyamide and another polymer having a cross section as shown in FIG. 1 or 2 can be used. Here, the component A is a polyamide and the component B is another polymer. Alternatively, a mixed yarn of polyamide and other fibers having a cross section as shown in FIG. 3 or 4 is used. Here, the component A is a polyamide and the component B is another fiber. The polyamide content in the polyamide composite fiber is 5
It is preferably at least% by weight.

Here, polyamide means, for example, nylon 4, nylon 6, nylon 7, nylon 11, nylon 12, nylon 66, nylon 6,10, polymethaxylylene adipamide, polyparaxylylene decanamide,
Examples thereof include polybiscyclohexylmethane decanamide and copolyamides containing them.

Other polymers used for the conjugate yarns shown in FIGS. 1 and 2 are, for example, polyesters such as polyethylene terephthalate, polytetramethylene terephthalate, polyethyleneoxybenzoate, polypivalolactone or polyethylene, polypropylene. And the like.

Other fibers used in the mixed yarns shown in FIGS. 3 and 4 include, for example, synthetic fibers such as polyester fibers and polyacrylonitrile fibers, and natural fibers such as cotton, silk and wool. Be done.

Next, the woven or knitted material to be treated preferably contains 20% by weight or more of the above-mentioned polyamide composite fiber, and the content of the polyamide in the entire woven or knitted material is 1 to 35% by weight, particularly 10 to 25% by weight. A range is preferred. When the content of the polyamide is less than 1% by weight, sufficient shrinkage cannot be obtained and the densification of the woven or knitted fabric is insufficient, which is not preferable. If it exceeds 35% by weight, the density after removing the polyamide is low and it is not preferable. Examples of the fibers that compose the woven or knitted fabric together with the composite fibers include synthetic fibers such as polyester and polyacrylonitrile fibers, and natural fibers such as cotton, silk and wool.

Examples of polyamide swelling agents include benzyl alcohol, β-phenylethyl alcohol, phenol, m-cresol, formic acid, acetic acid and the like, which are suitably used as an aqueous solution or an aqueous emulsion thereof. Among them, the method of using benzyl alcohol as an aqueous emulsion is particularly suitable in terms of shrinkability and ease of handling. The concentration of the swelling agent is preferably 1.5% by weight or more in order to achieve sufficient shrinkage by swelling. If it exceeds 50% by weight, it becomes unstable in the case of an aqueous emulsion, it becomes very difficult to remove the swelling agent afterwards, and there is a possibility that components other than the polyamide component may be affected. From this viewpoint, the concentration is particularly preferably 3 to 30% by weight.

The woven or knitted material is treated with the swelling agent to densify it. The treatment itself is known. For example, it is preferable to leave the woven or knitted fabric in the treatment liquid containing the polyamide swelling agent as described above, or to squeeze it with a mangle or the like and leave it for about 5 to 20 minutes. ..

Next, the swelling-treated woven or knitted fabric is impregnated with a resin to fix the structure of the woven or knitted fabric.

The resin used here must be a resin which is not dissolved or decomposed by the polyamide dissolution treatment agent used for the subsequent dissolution and removal of the polyamide, for example, polyurethane resin, melamine resin, polyacrylic acid ester resin, etc. Chosen from. The resin is impregnated by applying a solution or emulsion containing the resin to the woven or knitted material by a method such as padding or spraying and impregnating the woven or knitted material. The resin impregnation amount is preferably 3 to 30% of the weight of the woven or knitted fabric. The method of fixing the resin is selected according to the properties of the resin. For example, as a dry method, a method of drying and heating at 100 to 140 ° C. can be performed. In the case of polyurethane resin, a wet method can also be used. By carrying out the treatment, it is possible to prevent the density of the woven or knitted material from being lowered due to subsequent dissolution and removal of the polyamide.

Next, the impregnated woven or knitted material is treated with a polyamide dissolution treating agent to dissolve and remove the polyamide. Examples of the polyamide dissolution treating agent used here include formic acid having a concentration of 70% or more, phenols having a concentration of 70% (liquid temperature of 65 ° C. or more), and the like. In the method of the present invention, the untreated product is left to immerse in the treatment liquid containing the polyamide dissolution treating agent as described above, or after immersing, it is squeezed and wound with a mangle or the like, and is left to rotate for about 5 to 20 minutes. After being left standing, the treatment liquid and water are washed in this order to dissolve and remove the polyamide. The temperature of the treatment liquid varies depending on the type of the polyamide dissolution treatment agent used, but is preferably 5 to 8
It is 0 ° C, and particularly preferably 10 to 50 ° C. When dipping and squeezing, the amount of the polyamide dissolution treating agent held by the cloth is preferably 1 to 50% by weight (based on the weight of the cloth).

As described above, according to the method of the present invention, after the resin is impregnated and fixed, the densification of the woven or knitted fabric can be maintained in order to dissolve and remove the polyamide, and the polyamide that has undergone swelling and shrinkage can be obtained. Since it does not contain it, it is possible to produce a high-density woven or knitted fabric having a clear hue and high dyeing fastness.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

[0018]

EXAMPLE A nylon 6 having a cross section as shown in FIG.
A twill weaving machine (2/2 twill) consisting of nylon 6 / polyethylene terephthalate (PET) conjugate yarn in which 33% of is combined with 18% benzyl alcohol emulsion (emulsifier: Nika Kagaku Sanmor BK20Con).
c. (Used 1.8%) was padded with 50% pickup, then wound and left for 10 minutes while idling. Subsequently, the fabric was washed with hot water at 90 ° C and then dried at 100 ° C.

In this way, the nylon 6 fibers were shrunk to increase the density.

Next, heat setting was carried out at 190 ° C. for about 1 minute, and then a jet wins dyeing machine was used to obtain the following dyeing recipe at a temperature of 130 ° C. (pressure of 2.8 kg / c).
m ² ), and a bath ratio of 1:26 was used for 60 minutes for dyeing.

<Dyeing Formula> Kayaron Polyester Scarlet RLSF (Disperse Dye): 5% by Weight (to Fabric Weight) Kayaron Polyester Rubin 3GLS (Disperse Dye): 5% by Weight (to Fabric Weight) Rincut (Phosphorus-free Organic Acid): 0.2 cc / l Nikkasansalt RM300 (non-ionic / anionic activator): 1 cc / l Subsequently, the following reduction cleaning formulation was used to obtain a temperature of 80 ° C. and a bath ratio of 1:
Reduction cleaning was performed at 26 for 30 minutes.

<Reducing and Washing Formulation> Hydrosulfite 2 g / l Caustic soda 1 g / l Amirazine D (nonionic activator) 0.5 g / l After that, the dyed cloth was covered with 15% polyether polyurethane resin (Crisbon 1836P). (Manufactured by Dainippon Ink and Chemicals, Inc.) was padded with a pickup of 60% and immediately washed with hot water at 40 ° C. to fix the polyurethane resin.

Subsequently, the treatment with formic acid having a concentration of 70% (normal temperature, bath ratio 1:26) for about 30 minutes was repeated three times in a Jetwins dyeing machine to dissolve and remove nylon 6. Then, it was thoroughly washed with water and then dried at 100 ° C.

The resulting fabric had a clear hue and the dyeing fastness was good as shown in Table 1. Further, the density of the cloth was sufficiently high, and a sufficient volume feeling was maintained.

[0025]

Comparative Example In the same manner as in the example, nylon 6 fibers were swelled using a twill weaving machine to densify.

Subsequently, after dyeing, the nylon 6 fibers in the woven fabric were dissolved and removed under the same conditions as in the example using formic acid having a concentration of 70% without being impregnated with the polyurethane resin, and dried. went.

As a result, the nylon 6 fibers in the structure of the woven fabric were removed, the structure became loose and the density became low, and it was not possible to manufacture a high-density woven fabric which maintained a sufficient volume feeling. The results are shown in Table 1.

[0028]

TABLE 1 Nylon 6 Nylon 6 lightfastness dissolve away before dissolving away after Kabon'a warp density weft density thickness warp density weft density thickness hue over click 40 o'clock (mm) (mm) between (grade) ───── ─────────────────────────────── Example 153 98 0.25 153 98 0.24 Vivid 5 Comparative example 153 98 0.25 150 95 0.19 Vivid 5 ──────────────────────────────────── Warp density, Weft density: Books / inch

[0029]

As described above, by using the method of the present invention, it is possible to produce a high density woven or knitted fabric having a clear hue and high dyeing fastness.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conjugate yarn composed of polyamide and another polymer, in which component A is polyamide and component B is another polymer.

FIG. 2 is a cross-sectional view of a conjugate yarn composed of polyamide and another polymer, where component A is polyamide and component B is another polymer.

FIG. 3 is a cross-sectional view of a mixed fiber yarn composed of polyamide and other fibers, in which component A is polyamide and component B is other fiber.

FIG. 4 is a cross-sectional view of a mixed fiber yarn composed of polyamide and other fibers, in which component A is polyamide and component B is other fiber.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location D03D 15/00 B 7199-3B E 7199-3B D06M 13/188

Claims (1)

[Claims] 1. A woven or knitted material containing a polyamide composite fiber is treated with a swelling agent for polyamide to densify it, and then impregnated and fixed with a resin which is not substantially dissolved or decomposed by a polyamide dissolution treating agent. A method for producing a high-density woven or knitted fabric, which comprises dissolving and removing polyamide with a polyamide dissolution treatment agent.