JPH0653993B2 - Method for producing fibrillated knitted fabric - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a knitted fabric made of fine fiber by using a fibrillation method (division method), and more specifically, a polyamide and an easily dyeable polyester. It is a method for producing a fibrillated knitted fabric having excellent dying property as a fibril component.

(Prior Art) Conventionally, many attempts have been proposed to obtain a fiber structure having a suede-like appearance and a soft texture with a knitted or woven fabric made of a single yarn (fibril) having an extremely fineness.

One of them is a method in which a knitted or woven fabric obtained by using the fibrillated composite fiber is subjected to a heat treatment or a chemical treatment to divide the composite fiber into respective components to form a fiber structure.

As the fibrillated type composite fiber, one in which a plurality of types of high molecular weight polymers are joined is used, but generally, one in which polyamide and polyester are joined is used to swell and shrink the polyamide with a chemical agent to fibrillate Is being done. (Japanese Patent Publication No. 53-35633) However, since ordinary polyester must be dyed with a disperse dye under high temperature and high pressure, it causes contamination and deterioration of the polyamide component, and other fibers, especially silk.
It has a drawback that it cannot be mixed with natural protein fibers such as wool.

For this reason, in JP-A-61-108766, a polyester is used in which isophthalic acid is copolymerized and the concentration of metal sulfonate groups is 1.8 to 4.0 mol%, and dyeing is performed with a basic dye. It is disclosed that adjusting the concentration of isophthalic acid (metal sulfonate group) solves the problem that the introduction of the sulfo group increases the affinity with polyamide and makes it difficult to fibrillate.

(Problems to be Solved by the Invention) However, it is difficult to obtain a fully fibrillated knitted fabric by the method disclosed in the above-mentioned prior art because the method still has a high affinity with polyamide.

The present invention is to solve such a drawback, and it is sufficiently dyed at room temperature, and can be completely fibrillated by an ordinary fibrillation treatment, and does not deteriorate the fiber even in these steps, so that natural protein fibers such as silk and wool can be obtained. It is an object of the present invention to provide a fibrillated knitted fabric that can be mixed together.

MEANS FOR SOLVING THE PROBLEM The present invention relates to polyethylene terephthalate obtained by copolymerizing an isophthalic acid component having a metal sulfonate group, and one component does not completely include the other component in a cross section of polyamide and a single filament. A fibrillated type composite fiber which is joined in a shape along the longitudinal direction and has a fineness after division of 0.5 denier or less, and further, 6 to 20% by weight of copolymerized polyethylene terephthalate is reduced by an alkaline aqueous solution. A knitted or woven fabric comprising a polyamide swelling agent to fibrillate the composite fiber, or polyethylene terephthalate obtained by copolymerizing an isophthalic acid component having a metal sulfonate group, and a single filament of polyamide. One component completely contains the other in the cross section of 6 to 2 of a copolymerized polyethylene terephthalate obtained by applying an aqueous alkaline solution to fibrillated composite fibers which are joined together in the longitudinal direction in a non-shaped shape and have a fineness after division of 0.5 denier or less.
After the amount of 0% by weight is reduced, it is mixed with natural protein fibers for knitting, and then the knitted fabric is treated with a polyamide swelling agent to fibrillate the composite fiber.

The fibrillated composite fiber of the present invention is one in which a polyamide and a basic dye-dyeable polyester having a sulfonate group (hereinafter referred to as copolymerized PET) are joined. Copolymerized PET uses isophthalic acid having a metal sulfonate group, specifically sulfoisophthalic acid such as dimethylisophthalate and bis-2-hydroxyethylisophthalate, as a copolymerization component, and 80% or more of the constituent units thereof are used. A polyester such as ethylene terephthalate or tetramethylene terephthalate is copolymerized in an amount of about 2 to 5 mol%. Further, the copolymerized PET may be further copolymerized with a third component such as polyalkylene glycol. For example, if 5% to 15% by weight of polyethylene glycol having an average molecular weight of 500 to 4000 is copolymerized at room temperature. Can be dyed.

Examples of the polyamide include nylon 4, nylon 6, nylon 7, nylon 11, nylon 12, nylon 66, nylon 6/10, polymetaxylene adipamide, polyparaxylylene decanamide, polybiscyclohexylmethane decanamide, and the like. Examples thereof include copolyamides containing them, and nylon 6 and nylon 66 are preferable.

As for the shape of the composite fiber, as shown in FIGS. 1 (A) to (E), one component is joined along the longitudinal direction in a shape such that one component does not entirely include the other component in the cross section of the single filament. In particular, as shown in FIGS. 1 (C) to (E), those in which 4 to 8 radial-shaped polyamide components and a copolymerized PET component that complements the radial portions are joined are preferable. Further, both components cannot be provided with the soft texture as the object of the present invention unless they have a fineness of 0.5 denier or less after the fibrillation treatment described below.

The fibrillated composite fiber is reduced in weight by dissolving a part of the copolymerized PET component. An alkaline aqueous solution is usually used for the dissolution treatment, and examples thereof include caustic soda, caustic potash, and sodium metasilicate. The dissolution treatment should not be carried out to the entire amount of the copolymerized PET component or completely so that the adhesion with the polyamide is peeled off, and it is essential that the dissolution treatment is carried out at a weight reduction rate of 6 to 20% by weight. The alkali dissolution treatment may be carried out in the state of fibers or after weaving, but when mixed with natural protein fibers which are dissolved and deteriorated by alkali, the weight is reduced in advance at the fiber stage.

In knitting and weaving, other fibers may be used in addition to the fibrillated type composite fibers, as described above, but especially natural fibers,
When used in combination with wool or silk, it is preferable because both the soft feel of the ultrafine yarn obtained by fibrillation and the high-grade feel of natural fiber can be obtained. The mixing method may be any of mixed knitting, mixed weaving, mixed spinning, twisted yarn, and the like. In the case of mixed weaving, it is preferable to use natural fiber for the warp and composite fiber for the weft.

The fibrillation treatment is performed by causing the polyamide component to swell and shrink. Examples of the swelling agent for polyamide include benzyl alcohol, β-phenylethyl alcohol, phenol, m-cresol, formic acid, acetic acid, etc., and it is suitable to use as an aqueous solution or an aqueous emulsion. In particular, the method using an aqueous emulsion of benzyl alcohol is most suitable for the method of the present invention in view of shrinkability and fibrillation effect of the woven fabric and in that it is relatively easy to handle.

To make an aqueous emulsion of the above fibrillating agent, a surfactant is added to the fibrillating agent to obtain a light transmittance of 50%.
The surfactant may be emulsified and dispersed so that the amount is not more than about a certain degree, and the surfactant may be any of nonionic surfactants, cationic surfactants, anionic surfactants, amphoteric surfactants, and mixed types thereof.

The concentration of the fibrillating agent must be 1.5% by weight or more in order to obtain sufficient shrinkage and fibrillation effect.
If it exceeds 50% by weight, it becomes unstable in the case of an aqueous emulsion, and it becomes very difficult to remove the fibrillating agent afterwards. Further, if it exceeds 50% by weight, there is a risk of adversely affecting components other than the polyamide component. From this viewpoint, the concentration is preferably 2.5 to 20% by weight.

In the method of the present invention, it is preferable that the woven fabric to be treated is left in the treatment liquid containing the fibrillating agent as described above, or is squeezed with mangle after the immersion.

The temperature of the treatment liquid is preferably 5 to 80 ° C., and when dipping and squeezing, the amount of the fibrillating agent held by the cloth is 1 to
50 wt% (vs. fabric weight) is preferred. Generally, when the concentration of benzyl alcohol or phenylethyl alcohol is low (usually 5% or less), a method of soaking and then heating is suitable (particularly, a method of soaking in a liquid having a temperature of 40 ° C. or less and then raising it to 70 ° C. or more is preferable. It is valid). If it is 8% or more, the padding method is suitable.

Example 1 Example 1 66: Nylon and polyethylene terephthalate were mixed with 2.5 mol% of sulfoisophthalic acid and 7% by weight of polyethylene glycol (average molecular weight 600) to prepare a copolymerized PET of 1: 3 (volume ratio). The fibrillated composite filament (Fig. 1 (E)) melt-spun and spun at a ratio of 1% was cheese-wound and immersed in 2% caustic soda at 80 ° C for 10 minutes to allow it to stand, thereby reducing the amount of the copolymerized PET component by 16%. Let

Then, the reduced fibril type composite filament was knitted into a cylinder and dipped in a 9% benzyl alcohol emulsion (the temperature was raised to 80 ° C. in 30 minutes, and soaked for 20 minutes to leave it for fibrillation).

The resulting knitted fabric was very soft, plump and had a silky texture.

Example 2 The fibrillated composite filament of Example 1 was used in Example 1.
After the weight was reduced in the same manner as described above, a plain weave was woven using 48-count wool as a warp and a fibrillated composite filament as a weft.

25% benzyl alcohol, 2.5% emulsifier
After squeezing it so that the liquid retention rate is 100% and leaving it at room temperature for 2 hours, washing with water and drying, and examining the resulting fabric, it is very soft and plump and has a silky texture. Was to have.

Example 3 The fibrillated composite filament of Example 1 was used in Example 1.
After reducing the weight in the same manner as above, a plain woven fabric was woven using a 120 count silk as a warp and a fibrillated composite filament as a weft.

The plain woven fabric was immersed in an emulsion solution of 7% β-phenylethyl alcohol and 2% emulsifier, heated to 90 ° C. for 30 minutes, treated for 30 minutes as it was, washed with water and dried to examine the woven fabric.

The texture of the obtained fabric was soft and plump.

(Effects of the Invention) As described above, the fibrillated knitted fabric according to the present invention has a soft texture and elegant luster, and is extremely useful as a material for outer garments. It can be easily manufactured. Further, since the polyester portion is made of a cationic dyeable type at atmospheric pressure, it can be dyed at atmospheric pressure and can be mixed with protein fibers such as wool and silk.

[Brief description of drawings]

FIG. 1 is a schematic view showing a cross section of a fibrillated type composite fiber used in the present invention.

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Claims (2)

[Claims] 1. A polyethylene terephthalate copolymerized with an isophthalic acid component having a metal sulfonate group and a polyamide are formed in a cross section of a single filament so that one component does not completely include the other component along the longitudinal direction. A fibrillated type composite fiber which is spliced together and has a fineness of 0.5 denier or less after splitting, and which has a polyethylene terephthalate of 6-
A method for producing a fibrillated knitted fabric, which comprises treating a knitted fabric comprising 20% by weight of the conjugate fiber with a polyamide swelling agent to fibrillate the conjugate fiber. 2. A polyethylene terephthalate copolymerized with an isophthalic acid component having a metal sulfonate group and a polyamide have a shape in which one component does not completely include the other component in a cross section of a single filament along the longitudinal direction. An aqueous alkaline solution is applied to the fibrillated composite fibers that have been joined and have a fineness of 0.5 denier or less to reduce 6 to 20% by weight of the copolymerized polyethylene terephthalate, and then mixed with natural protein fibers for knitting. And then treating the knitted fabric with a polyamide swelling agent to fibrillate the composite fiber, thereby producing a fibrillated knitted fabric.