JPH0284550A - Production of fibrillated knit or woven fabric - Google Patents

Abstract

PURPOSE:To obtain the subject knit or woven fabric dyeable at normal temperature by knititing or weaving a fibrillated conjugate fiber composed of a specific modified PET and a polyamide after reducing the weight of a part of the modified PET and treating the knit or woven fabric with a polyamide-swelling agent. CONSTITUTION:The fibrillated conjugate fiber (having a fineness of <=0.5de after splitting) is composed of a PET copolymerized with isophthalic acid component having a metal sulfonate group and a polyamide joined with each other in longitudinal direction in a state not to completely encircle a component with the other component in the cross-section of the fiber. The fiber is subjected to weight-reduction with an alkaline aqueous solution to dissolve a part of the copolymerized PET component. The treated knit or woven fabric is fibrillated with a polyamide-swelling agent. Since the fiber can be completely fibrillated without deteriorating the fiber, it can be blended with silk, wool, etc.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for producing knitted fabrics made of fine yarns using a fibrillation method (splitting method), and more specifically, a method for producing knitted fabrics made of fine yarns using a fibrillation method (splitting method). This is a method for producing fibrillated knitted fabrics having excellent dyeability as fibril components.

(Prior Art) Many patents have been proposed in the past that feature fiber structures that have a suede-like appearance and a soft texture made of knitted or nonwoven fabrics made of extremely fine single filaments (fibrils).

One of them is the polarized i obtained using fibrillated composite m-fibers.
There is a method of subjecting a fabric or nonwoven fabric to heat treatment or chemical treatment to divide the composite fiber into each component to obtain a fibrous structure.

The fibril supratype composite! A-fibers are made by bonding multiple types of high molecular weight polymers together, but generally polyamides and polyesters are bonded together and the polyamide is swollen and contracted with a chemical to form fibrils. There is. (Kibun No. 53-35633) However, since ordinary polyester must be dyed using disperse dyes under high temperature and high pressure, it may contaminate and deteriorate the polyamide component, and may cause damage to other fibers, especially silk, etc.
It has the disadvantage that it cannot be mixed with natural protein fibers such as wool.

For this reason, Japanese Patent Application Laid-Open No. 108786/1986 discloses that isophthalic acid is copolymerized to reduce the concentration of metal sulfonate groups to 1.
．． Using polyester with a molarity of 8 to 4.0, it is dyed with a basic dye and isophthalic acid (metal sulfonate) is introduced, which increases its affinity with polyamide and makes it difficult to fibrillate. basis)
It is disclosed that the problem can be solved by adjusting the a degree.

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

The present invention is a method for decomposing such defects, and is suitable for natural protein fibers such as silk and wool, which can be sufficiently dyed at room temperature, can be completely fibrillated by ordinary fibrillation treatment, and do not deteriorate AM even in these processes. The object of the present invention is to provide a fibrillated m-woven fabric that can be mixed with both.

(Means for Solving the Problems) The present invention provides a cross section of polyethylene terephthalate copolymerized with an isophthalic acid component having a metal sulfonate group, a polyamide, and a single filament, in which one component completely covers the other component. Fibrillar type composite A fibers that are joined along the longitudinal direction in a shape that does not include the fibers and have a fineness of 0.5 denier or less after splitting, and in addition, a part of the copolymerized polyethylene terephthalate has been reduced by an aqueous alkaline solution. A knitted fabric made of composite A fibers is treated with a polyamide swelling agent to fibrillate the composite M pongee, or polyethylene terephthalate copolymerized with an isophthalic acid component having a metal sulfonate group;
The polyamide is joined along the longitudinal direction in a shape in which one component does not completely encompass the other component in the cross section of a single filament, and the fibril-type composite A fiber has a fineness of 0.6 denier or less after splitting. After reducing a part of the copolymerized polyethylene terephthalate by applying an alkaline aqueous solution, knitting and weaving it by mixing it with natural protein fiber, and then treating the m-woven fabric with a polyamide swelling agent to fibrillate the composite *a. It is characterized by:

The superfibrillar composite W4 fiber of the present invention is made of polyamide and a basic dye-dyeable polyester having a sulfonate group (
(hereinafter referred to as copolymerized PET).

Copolymerized PET uses isophthalic acid having a metal sulfide group as a copolymerization component, and sulfoisophthalic acids such as dimethyl isophthalate and bis-2-hydroxyethyl isophthalate are used as A-isomers, and these constitute 80% of the constituent units.
The above is copolymerized with a polyester such as ethylene terephthalate or tetramethylene terephthalate 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 about 5 to 15 Nji% of polyethylene glycol with an average molecular weight of about 1500 to 4000 is copolymerized, Dyeing becomes possible.

Examples of polyamides include nylon 4 and nylon 8.
, nylon 7, nylon 11, nylon 12, nylon 68, nylon 6-10, polymethaxylene adipamide, polyparaxylylene decanamide, polybiscyclohexylmethanedecanamide, and copolyamides containing these as components. Nylon 6 and nylon 6G are preferred.

The shape of the composite fiber is one in which one component does not completely encompass the other component in the cross section of a single filament, as shown in Figure 1 (4) to (g), and is joined along the longitudinal direction. In particular, as shown in FIG. Unless the components have a fineness of 0.5 denier or less after being subjected to the fibrillation treatment described below, the soft texture that is the object of the present invention cannot be obtained.

Such fibrillated composite fibers are reduced in weight by dissolving a portion of the copolymerized PET component. In the dissolution treatment, an alkaline aqueous solution is usually used, and examples thereof include caustic soda, caustic potash, metasilicate powder, and the like. The dissolution treatment should not be carried out on the entire amount of the copolymerized PET component, nor should it be carried out so completely that the adhesive with the polyamide comes off, and it is preferable that the weight loss rate be 4 to 20% by weight. Further, the alkali dissolution treatment may be carried out in the fiber state or after knitting or weaving, but when used in combination with natural protein fibers which are degraded by dissolution by alkali, the weight should be reduced in advance at the fiber stage.

As mentioned above, other fibers may be used for the fibrillated composite material during knitting, but natural fibers,
When mixed with wool, silk, etc., both the soft texture of fibrillated ultrafine fibers and the luxurious texture of natural frost fibers can be obtained, which is preferable. Mixing methods include interlacing, knitting and weaving, mixed fibers,
Any material such as blended yarn or twisted yarn may be used, but in the case of mixed weaving, it is preferable to use natural aMI for the warp and composite TBT 16 for the weft.

The fibrillation treatment is carried out by subjecting the polyamide component to a swelling capacity of 1. Swelling agents for polyamide include benzyl alcohol, β-phenylethyl alcohol, phenol, m-cresol, am, acetic acid, etc., and are suitable for use in the form of an aqueous solution or an aqueous emulsion.

Particularly, among the above methods, the method using an aqueous emulsion of benzyl alcohol is most suitable for the method of the present invention in terms of the shrinkability of the fabric and the fibrillation effect, and also because the handling is relatively balanced33.

To make an aqueous emulsion of the above fibrillating agent, a surfactant is added to the fibrillating agent to achieve a light transmittance of 50%.
The surfactant may be a nonionic surfactant, a cationic surfactant, an anionic surfactant, an amphoteric surfactant, or a mixture thereof.

The concentration of the fibrillating agent needs to be at least 1.6% by weight in order to obtain sufficient shrinkage and fibrillating effects.
If it exceeds 50% by weight, the aqueous emulsion becomes unstable and subsequent removal of the fibrillating agent becomes extremely difficult. Furthermore, if it exceeds 50 iLtIb, there is a risk of adversely affecting components other than the polyamide component. From this point of view, the concentration is preferably 2.5 to 20% by weight.

In the method of the present invention, it is preferable to leave the fabric to be treated immersed in a treatment liquid containing the fibrillating agent as described above, or to squeeze the fabric using a mangle or the like after dipping.

The temperature of the treatment liquid is preferably 6 to 80°C, and when the fabric is immersed and squeezed, the amount of fibrillating agent retained by the fabric is 1
~50% by weight (based on fabric Mm) is preferred. Generally, when the concentration of benzyl alcohol or phenylethyl alcohol is low (usually 5% or less), heating after immersion is suitable (especially at 10°C after immersing in a liquid with a temperature of 40°C or less).
(It is effective to raise the temperature above this level.) If it is 8% or more, the padding method is suitable.

(Example) Example 1 Nylon 66 and polyethylene terephthalate were mixed with 2.5 moles of sulfoisophthalic acid, and polyethylene glycol (
Average molecule! A fibrillated composite filament (Fig. 1 (E)) prepared by melt spun spun copolymerized PET (1800) with 71 ffis at a ratio of 1:3 (soaking ratio) was wrapped in cheese, and was soaked in 2% caustic soda. By soaking and leaving at 80°C for 10 minutes, the copolymerized PET component
The weight was reduced by 6%.

After that, the fibril-type composite filament (MM)
Strain it and soak it in 8% pendyl alcohol emulsion (heat up to 80°C in 30 minutes and leave it for 20 minutes).
Fibrillation was performed by dipping for a minute and leaving it for a while.

The obtained knitted fabric was extremely soft and fluffy, and had a silk-like texture.

Example 2 The fibrillated composite filament of Example 1 was
After reducing the weight to 100% by weight, a plain woven fabric was woven using No. 48 wool for the warp and fibril-type composite filament 1 for the weft.

The plain fabric was soaked in 26 bags of benzyl alcohol and an emulsion solution containing 25% emulsifier, squeezed out to a liquid retention rate of 100%, left at room temperature for 2 hours, washed with water and dried, and the resulting fabric was examined. However, it was extremely soft and fluffy, and had a texture similar to silk.

Example 3 The fibrillated composite filament of Example 1 was
After reducing the weight in the same manner as above, plain weaving was carried out using 120 count silk for the warp and fibrillated composite filament for the weft.

After immersing the nuclear material in an emulsion solution containing 1% β-phenylethyl alcohol and 2% emulsifier, the temperature was raised to 80°C for 30 minutes, the same treatment was carried out for 30 minutes, and the fabric was then washed with water and dried. Examined.

The texture of the obtained fabric was soft and fluffy (effect of the invention).As described above, the fibrillated a-fiber structure according to the present invention has the following properties:
It has a soft texture and an elegant luster, and is extremely useful as a material for outer clothing, and the present invention allows such a material to be easily produced industrially.

In addition, since the polyester part uses a material that can be dyed with normal pressure cations, it can be dyed with 1ζ normal pressure, and can be dyed with proteins such as wool and silk. Mixed woven products with im are possible.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a cross section of a fibrillated composite fiber used in the present invention. 1st (A) (B) (C) (D) (E) -33

Claims (2)

[Claims] (1) Polyethylene terephthalate copolymerized with an isophthalic acid component having a metal sulfonate group and polyamide are bonded along the longitudinal direction in a shape in which one component does not completely encompass the other component in the cross section of a single filament. A knitted fabric made of a fibrillated composite fiber with a fineness of 0.5 denier or less after splitting, in which a part of the copolymerized polyethylene terephthalate has been reduced by an alkaline aqueous solution, is treated with a polyamide swelling agent. and fibrillating the composite fiber. (2) Polyethylene terephthalate copolymerized with an isophthalic acid component having a metal sulfonate group and polyamide are joined along the longitudinal direction in a shape in which one component does not completely encompass the other component in the cross section of a single filament. After applying an alkaline aqueous solution to fibrillated composite fibers with a fineness of 0.5 denier or less after splitting to reduce a portion of the copolymerized polyethylene terephthalate, the fibers are mixed with natural protein fibers and knitted, and then knitted fabrics are obtained. A method for producing a fibrillated knitted fabric, which comprises treating the composite fiber with a polyamide swelling agent to fibrillate the composite fiber.