JP2002146632A - Conjugated fiber and nonwoven fabric comprising the same fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a conjugated fiber with a high yield during the production process for the conjugated fiber, having good processing characteristics and good adhesion when a nonwoven fabric is produced and excellent performances of a good (soft) touch feeling and the nonwoven fabric comprising the fiber. SOLUTION: This conjugated fiber comprises at least two components in which one component A which is a polyhexamethylene adipamide copolymerized with >=0.01 and <=10 wt.% of a lactam and containing an inert particle and the other component B is a polyamide polymer containing an insert particle. The conjugated fiber has an inert particle content (wt.%) in the components A and B satisfying the following conditions (1) and (2) and the nonwoven fabric uses the fiber. 0.1<=A/B<=10.0...(1) 0.05 wt.%<=A+B<=5 wt.%...(2).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a conjugate fiber and a non-woven fabric using the fiber.

[0002]

2. Description of the Related Art Conventionally, conjugate fibers have been produced from various fiber materials such as polyester, nylon, acrylic, polyethylene, and polypropylene, and have been researched and developed by various synthetic fiber companies and educational institutions (universities). .
However, the production process of the composite fiber is complicated and the productivity is not high as compared with the non-composite fiber mainly using only a single component polymer. In particular, the setting of conditions such as melting conditions and yarn cooling after spinning (chimney) in the spinning process is complicated compared to non-composite fibers because it handles multiple component polymers, and the production process requires more advanced technology. Has become. Non-woven fabrics can also be used as composite fibers, but they are widely used in the fields of clothing and sanitary materials and are often used in direct contact with the skin. You. However, since these are synthetic fibers, they are poor in texture and unpleasant to the touch as compared with natural fibers. The conjugate fiber is also widely used as a heat-bonding fiber, and a production method for producing the heat-bonding fiber by utilizing a difference in melting point between two components in the conjugate fiber is generally used. Conventionally, however, composite fibers have poor adhesion strength as adhesive fibers in performing thermal bonding, and furthermore, dyeability in post-processing and heat resistance and chemical resistance, which are accuracy of products, are not high. In addition, in the case of polyester and polyethylene, a low-melting point polymer having a melting point of 100 ° C. or less is used as the polymer on the sheath side, so that high-speed bonding workability at a low temperature is possible, but crimping in the stretching step is not performed. At the time, when high-temperature steam is applied, the polymer used on the sheath side has a low melting point, so that many single yarns are broken, the crimp imparting property is further deteriorated, and the yield in the fiber manufacturing process is low. There is. In addition, since the composite fiber has low crimp, a resinous hard mass called agglutination is formed under high-temperature steam, so that a high number of crimps cannot be expected. For this reason, low-crimped fibers are insufficiently entangled in terms of card passing property even when carding is performed in post-processing, and the card passing speed cannot be increased, and the productivity is not high.

[0003] Heat-bonding short-fiber nonwoven fabrics using composite fibers are used for various purposes such as agricultural and horticultural materials, daily life materials, medical and sanitary materials, civil engineering and construction materials, clothing, industrial materials, and the like. ing. In addition, in nonwoven fabrics for clothing and sanitary materials of coated papers for disposable diapers and absorbent articles for which the demand has been rapidly increasing in recent years, a soft and soft texture is required. In addition, the demand for non-woven fabrics for electrical and electronic equipment is expanding, and in this field, non-woven fabrics are required to have good chemical resistance and excellent water retention, and to be used for shoe insoles or shoe insoles. Even as a non-woven fabric, there is a demand for a stiffness and a soft and comfortable feeling when the shoes are worn for a long time.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite fiber having a high yield in the production process, a good processability in the production of a nonwoven fabric, excellent uniformity, and a good texture. It is an object of the present invention to provide a conjugate fiber which is good (soft) and excellent in dyeability and a nonwoven fabric using the fiber.

[0005]

To solve the above problems, the present invention has the following arrangement.

That is, one component A contains inert particles, a polyhexamethylene adipamide polymer in which lactam is copolymerized in an amount of 0.01% by weight or more and 10% by weight or less, and the other component B contains a polyamide containing inert particles. A conjugated fiber comprising at least two components of a polymer and having inert particles of A and B whose content (wt%) satisfies the following condition. A / B = 0.1 or more and 10.0 or less (1) A + B = 0.05 wt% or more and 5 wt% or less (2) A nonwoven fabric using the above-described composite fiber.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The conjugate fiber of the present invention comprises a polyhexamethylene adipamide polymer in which one component A contains inert particles and a lactam is copolymerized in an amount of 0.01 to 10 wt% and the other component. B comprises at least two components of a polyamide polymer containing inert particles, and A
And B are conjugate fibers in which the content (wt%) of inert particles satisfies the following conditions. A / B = 0.1 or more and 10.0 or less (1) A + B = 0.05 wt% or more and 5 wt% or less (2) In the present invention, the polyhexamethylene adipamide polymer of one component A is spun. It is necessary that the lactam is copolymerized from 0.01 wt% to 10 wt% from the viewpoints of stabilizing properties and fiber texture.
It is more preferable that the copolymerized copolymer be at least t% and at most 2 wt%. If the polymerization rate of the lactam is less than 0.01 wt%, the hand becomes hard, and if it exceeds 10 wt%, the spinnability deteriorates, which is not preferable.

In the present invention, the polyamide polymer refers to nylon 6, nylon 4/6, nylon 6/10, nylon 11, nylon 12, and the like. Among them, in view of spinnability, fiber texture, and fiber hygroscopicity during fiber production. To nylon 6 is preferred. Further, the difference in melting point between at least two component polymers according to the present invention is preferably 20 ° C. or more, more preferably 30 ° C. or more, from the viewpoint of thermal adhesion and fiber texture.

In the case of the core-sheath type fiber, it is preferable that the melting point of the polymer on the sheath side is lower than that of the core side because of good adhesiveness. Is preferably two.

In the present invention, the component A and the component B as inert particles contain silicon oxide such as titanium oxide, colloidal silica, wet silica, dry silica, kaolin, calcium carbonate, zirconia, etc. Titanium oxide is preferred in terms of spinnability and dyeability.

Regarding the content of the inert particles contained in the polymers A and B constituting the composite fiber of the present invention, the content of the inert particles contained in one component A and the content of the inert particles contained in the other component B Is in the range of 0.05 wt% to 5 wt% from the viewpoint of spinnability and fiber texture, and preferably 0.30 wt% to 1 wt%. If the sum of the inert particle contents is higher than 5 wt%, the hand becomes hard, and if the sum is lower than 0.05 wt%, the whiteness decreases and the dyeability deteriorates, which is not preferable.
Further, when the value A / B obtained by dividing the content of the inert particles contained in one component A by the content of the inert particles contained in the other component B is in the range of 0.1 to 10.0. The spinnability is stabilized, and the dyeability of the fiber is improved. It is more preferably 0.4 or more and 5.0 or less, and further preferably 0.8 or more and 1.2 or less. If this content is lower than 0.1, the adhesive strength is reduced when a non-woven fabric is produced from the fiber,
It is not preferable because the spinnability is significantly deteriorated in the spinning production process. Conversely, a value higher than 10.0 is not preferable because the card passing property is deteriorated.

The difference between the melting points of the at least two component polymers according to the present invention is preferably 20 ° C. or more, more preferably 30 ° C. or more, from the viewpoints of thermal adhesion and fiber texture. The number of components constituting the composite fiber of the present invention is preferably two.

With respect to the polymer configuration of the cross section of the single fiber of the conjugate fiber of the present invention, a core-sheath type or a side-by-side type is preferred from the viewpoint of thermal adhesion and fiber texture, and a core-sheath type is more preferred. Alternatively, it is preferable that the component is exposed on a part of the fiber surface. For example, a split type, a sea-island type, and a peel type are preferable.

The composition ratio of the polymer constituting the conjugate fiber of the present invention is preferably 30% or more and 70% or less, more preferably 40% or more and 60% or less, as the composition ratio of the polyhexamethylene adipamide polymer to the whole fiber from the viewpoint of fiber texture.
% Is more preferable. As the fiber form in the present invention, short fibers are desirable in terms of low cost and ease of processing, and the cut length of the fibers is preferably 90 mm or less. The fineness of the composite fiber of the present invention is preferably 0.01 dtex or more and 10.0 dtex or less, more preferably 3.0 dtex or more and 4.0 dtex or less. If it is less than 0.01 decitex, the process passability is deteriorated, which is not preferable. If it exceeds 10.0, the texture becomes hard, which is not preferable. When the conjugate fiber of the present invention is used for insole insole or non-sole insole, the most important factor is the fineness from the viewpoint of difficulty in stuffiness when wearing shoes for a long time and soft and soft comfort. Is 3.
It is preferably from 0 dtex to 4.0 dtex.

In the present invention, when producing a conjugate fiber,
The polymer is extruded using a die. From the viewpoint of spinning productivity, the number of die holes is preferably 10 or more and 5000 or less, more preferably 300 or more and 700 or less. The spinning speed is 100 m / min or more and 30 or more.
00m / min or less, preferably 700m / min or more and 1000
m / min or less is more preferable. The stretch ratio is preferably 2.0 times or more and 5.0 times or less, and more preferably 3.0 times or more and 4.0 times or less, from the viewpoints of stretchability and fiber texture.

In the present invention, spinning is performed to improve smoothness from the viewpoint of productivity and to prevent breakage due to friction.
It is preferable to apply an oil agent at at least two places during a fiber production process such as drawing, and the amount of oil applied to the fibers is preferably in the range of 0.10% to 0.60% from the viewpoint of adhesive strength. Further, as a method of applying the oil agent, it is preferable to use an application method in which the oil agent is charged into a bath with a roller called a spray or a process bath and the fibers are immersed. Further, from the viewpoint of card passing property, the number of crimps of the composite fiber of the present invention is 25
The range is preferably 10 or more and 20 or less per mm length.

The non-woven fabric using the conjugate fiber of the present invention is:
20g / m^TwoAbove, 200 g / m^TwoIs preferred,
More preferably 60 g / m^TwoMore than 120g / m^TwoBelow
is there. The basis weight is 200g / m^TwoHigher and heat bonding
The bonding efficiency of the nonwoven fabric
It is not preferable because the degree is lowered. 20g / m ^Two
Lower is preferable because the texture of the nonwoven fabric becomes hard
Absent. Thermal bonding temperature is 180 ° C or more and 250 ° C or less
190 ° C or higher and good texture
It is more preferable that the temperature is 10 ° C. or lower.

The method for producing a nonwoven fabric of the present invention can be produced according to a conventional method. Further, as the thermal bonding method, it is preferable to emboss the nonwoven fabric from the viewpoints of the appearance of the nonwoven fabric, the texture of the fiber, and the strength of the nonwoven fabric.

The nonwoven fabric of the present invention is used for agricultural and horticultural materials,
It can be used for daily life materials, medical hygiene materials, civil engineering and construction materials, clothing, industrial materials, and various other uses. It is preferable to use it for the insole insole or the nonwoven fabric for the insole. In the present invention, the composition ratio of the conjugate fiber in the entire nonwoven fabric is preferably 80% or more, and more preferably 100%, as a condition for satisfying the soft texture and the difficulty of stuffiness even if it is worn for a long time.

[0020]

EXAMPLES The present invention will be further described below with reference to examples. Examples 1-2, Examples 4-6 Lactam was copolymerized to obtain titanium oxide particles at 0.38 wt%.
N6 polymer, which is a polyamide containing added polyhexamethylene adipamide N66 polymer as a core component to an extruder-type melt spinning machine and melted at a spinning temperature of 290 ° C., and at the same time, 0.38 wt% of titanium oxide particles added. Is supplied as a sheath component to another extruder-type melt spinning machine and melted at 270 ° C.
It was spun from a triple concentric core-sheath spinneret with 600 3 mm spinning holes. In this case, the lactam copolymerization ratio to N66 polymer, which is polyhexamethylene adipamide, was set to 1.0 wt% for Examples 1 to 3,
In Example 4, the copolymerization ratio was 0.05 wt%, and in Example 5, the copolymerization ratio was 5.0 wt%. The spinning speed during the spinning was 1300 m / min (Example 1), 1000 m / min (Example 2), and 800 m / min (Examples 3 to 6). It was stored in a cylindrical container called. The undrawn yarn was drawn at 3.25 times, crimped, and then cut to a length of 38 mm to obtain a core-sheath conjugate fiber having thermal adhesiveness. The fineness was 1.3 dtex (Example 1), 1.8 dtex (Example 2), and 3.3 dtex (Examples 3 to 6). Example 3 A lactam was copolymerized to obtain 0.08% by weight of titanium oxide particles.
The added polyhexamethylene adipamide N66 polymer is supplied as a core component to an extruder-type melt spinning machine and melted at a spinning temperature of 290 ° C., and at the same time, a polycapramid polymer to which 0.16 wt% of titanium oxide particles is added is added. Except that it was a sheath component, the above Examples 1-2 and Examples 4-
A composite fiber was obtained in the same manner as in Example 6. Example 7 A fiber having a core-in-sheath cross-sectional shape in which N66 polymer which is polyhexamethylene adipamide copolymerized with 1.0 wt% of lactam as a core component and nylon 12 (N12) polymer which is a polyamide is a sheath component (fineness: (1.3 decitex)
Was obtained in the same manner as in Examples 1 to 5. Comparative Example 1 N66 polymer which is polyhexamethylene adipamide to which 0.01% by weight of titanium oxide particles was added was used as a core component (A).
A composite fiber was obtained in exactly the same manner as in Example 1 except that a polycapramid polymer containing 0.01 wt% of titanium oxide particles was used as a sheath component (B), except for the addition ratio of titanium oxide particles. Comparative Example 2 N66 polymer which is polyhexamethylene adipamide containing 15.00 wt% of titanium oxide particles was used as a core component (A), and a polycapramid polymer containing 15.00 wt% of titanium oxide particles was used as a sheath component (B). A composite fiber was obtained in exactly the same manner as in Example 1 except for the addition ratio of titanium oxide particles. Comparative Example 3 N66 polymer, which is a polyhexamethylene adipamide polymer containing 0.03 wt% of titanium oxide particles as a core component (A), and N6 polymer, a polyamide containing 0.002 wt% of titanium oxide particles, as a sheath component ( A composite fiber was obtained in exactly the same manner as in Example 1 except for the addition ratio of titanium oxide particles as B). Comparative Example 4 N66 polymer which is polyhexamethylene adipamide containing 0.001 wt% of titanium oxide particles was used as a core component (A), and a polycapramid polymer containing 0.03 wt% of titanium oxide particles was used as a sheath component (B). A composite fiber was obtained in exactly the same manner as in Example 1 except for the addition ratio of titanium oxide particles. Comparative Example 5 A polyethylene polymer containing 0.38% of titanium oxide added to a sheath was supplied to an extruder-type melt spinning machine and melted at a spinning temperature of 175 ° C., and at the same time, 0.38 w of titanium oxide was added.
The polyester polymer to which t% was added was supplied as a core component to another extruder-type melt spinning machine, and 300
C. and melted at a spinning speed of 1300 m / min from a concentric core-sheath die having 500 spinning holes with a diameter of 0.3 mm. Thereafter, it was stretched at 3.20 times, crimped, and then cut into a length of 38 mm to obtain a core-sheath composite fiber having a heat-adhesive property (fineness: 1.3 decitex). Comparative Example 6 A polyester having a low melting point copolyester containing 0.38% of titanium oxide added to the sheath and melted at a spinning temperature of 155 ° C. by feeding the extruder type melt spinning machine, and simultaneously 0.38% by weight of titanium oxide was added. The polymer is supplied as a core component to another extruder-type melt spinning machine and melted at 300 ° C. to form a spinning hole 6 having a diameter of 0.3 mm.
13 from 00 triple concentrically arranged core-sheath bases
It was spun at a spinning speed of 00 m / min. After that, 3.
After stretching by 20 times and applying crimp, the fiber was cut to a length of 38 mm to obtain a core-sheath type composite fiber (fineness: 1.3 dtex) having thermal adhesiveness. Comparative Example 7 A polycapramid polymer having a sheath portion added with 0.38% of titanium oxide was supplied to an extruder-type melt spinning machine and melted at a spinning temperature of 175 ° C., and at the same time, 0.3% of titanium oxide was added.
The polyester polymer to which 8 wt% was added was supplied as a sheath component to another extruder-type melt spinning machine, and 3
Both were melted at 00 ° C. and spun out from a triple concentric core-sheath spinneret with 600 spinning holes having a diameter of 0.3 mm.
At this time, a cylindrical cooling device to which cooling air having a length of 60 cm and a temperature of 7 ° C. is supplied at a speed of 60 m / min is installed immediately below the base to cool and solidify and apply a 1.8% oil solution. , 1
It was stored in a cylindrical container called a take-off can at a speed of 300 m / min. Thereafter, it was stretched at 3.20 times, crimped, and then cut into a length of 38 mm to obtain a core-sheath composite fiber having a heat-adhesive property (fineness: 1.3 decitex). Comparative Examples 8, 9 As a single component, a polyester polymer (Comparative Example 8),
The polycapramide polymers (Comparative Example 9) were supplied to separate extruder-type melt spinning machines, and spun from separate spinnerets. Other conditions such as the number of holes in the die are the same as those in the examples, and the subsequent stretching and cutting methods and conditions are the same as those in the examples and comparative examples 1 to 3, and a non-composite fiber having a single yarn fineness of 0.8 decitex is used. Obtained. Comparative Examples 10 to 12 In the same manner as in Examples 1 to 5, core-sheath composite fibers having thermal adhesiveness were obtained. However, the following conditions are different from those of the embodiment. The lactam copolymerization ratio with respect to N66 polymer, which is polyhexamethylene adipamide, was set to 0 wt% for Comparative Example 10 and 0.005 wt% for Example 11.
%, And Example 1 was 15.0 wt%. Comparative Example 13 A fiber having a core-in-sheath cross-sectional shape in which N66 polymer, which is polyhexamethylene adipamide copolymerized with 1.0% by weight of lactam, and a polyester as a sheath component (fineness: 1.
3 dtex) was obtained in the same manner as in Examples 1 to 5.

The fibers obtained in the above Examples and Comparative Examples were opened with a cotton batter and formed into a card-like web twice with a roller card machine. Thereafter, the layers were laminated to a basis weight of 100 g / m ² , and were thermally bonded to the examples and comparative examples at the temperatures shown in Table 1. In this case, as a method of performing the thermal bonding, the web was pressed and formed by heating with two rolls, one of which was a steel heating roll, and the other was of a paper roll. The surface of the heating roll used an embossed roll engraved from the viewpoint of good texture, adhesive strength and good density of the nonwoven fabric. As the paper roll, a roll made of an elastic body (surface, paper, etc.) and capable of adjusting the contact pressure of the emboss roll was used. The clearance and pressure of the roller at that time were adjusted to 0.05 mm and 5.5 kg / cm ² , and the speed was adjusted to 1.5 m / min to obtain a nonwoven fabric.

Table 1 shows the results of Examples and Comparative Examples.

The characteristics shown in Table 1 were obtained by the following methods. (1) Spinnability: The number of single yarn breaks immediately below the die with respect to the production amount of 1 t was measured. (2) Number of crimps: JIS standard L1015-7.12-1
The measurement was carried out according to the above method. (3) Yield (%): It was determined from (predetermined fiber production amount / amount of raw material polymer used to obtain the predetermined production amount) × 100. (4) Card passability: Good spinning without troubles such as web breakage, nep generation, and cylinder winding ◎: Excellent, with a maximum spinning speed of 130 to 140 m / min at which the above troubles occur ○: good, further 100
１３０: 130 m / min, represented by Δ: passable, and less than 100 m / min, ×: poor passage. (5) Dyeability: ambient temperature 20 ° C., relative humidity 55%, 1
The whole fiber was immersed for 5 seconds in a container containing a blue dye under atmospheric pressure, and the degree of dyeing was evaluated in the following four steps. ：: Very good dyeing ：: Good dyeing ：: Dyeing ×: Dyeing degree is weak (6) Texture: Ten non-woven fabrics were judged by tactile sensation with palm. ◎: All 10 persons judged that the texture was good. ：: 8 to 6 persons judged to be good. Δ: 5 to 3 persons judged to be good. ×: Two or less persons judged to be good. (7) Adhesive strength: A nonwoven fabric was cut into a width of 7 cm and a length of 22 cm, and measured at a gripping distance of 11 cm and an elongation speed of 20 cm / min. The adhesive strength was a value obtained by removing the tensile strength at break by the sample weight. (8) Heat resistance: The nonwoven fabric was cut into a width of 7 cm and a length of 22 cm, heated in a hot-air dryer at 150 ° C. for 5 minutes, and evaluated in the following four grades. ：: Almost no change in appearance ：: Slight discoloration △: Discoloration X: Severe discoloration or melting is observed (9) Chemical resistance: 10 samples of nonwoven fabric cut to 7 cm in width and 22 cm in length Each of them was immersed in a container containing an alkaline solution for 2 seconds, and then visually pulled up, and evaluated according to the following four grades. ◎: Almost no change in appearance 若干: Slight melting △: Clear melting X: Severe melting is observed (10) Overall judgment: Displayed in the following four stages. ◎: Excellent ○: Good △: Acceptable ×: Poor

[0024]

[Table 1]

[0025]

According to the present invention, spinnability, crimp imparting property,
A conjugate fiber having a good yield can be provided.

In the case of processing into a nonwoven fabric using the composite fiber of the present invention, it is easier to process than conventional composite fiber in both process passability and dyeability, and has good heat resistance, chemical resistance, adhesive strength, and texture. A nonwoven fabric excellent in the above.

Continued on front page F term (reference) 4L041 AA07 AA20 BA02 BA05 BA09 BA21 BA49 BA59 BC04 BC20 BD03 BD11 CA21 CA26 CA29 CB05 CB25 DD01 DD05 DD15 DD22 DD23 4L047 AA23 AA27 AA29 AB02 BA08 CB05 CB10

Claims (6)

[Claims] 1. A polyamide containing one component A containing inactive particles, a polyhexamethylene adipamide polymer in which lactam is copolymerized in an amount of 0.01 to 10% by weight and a component B containing inactive particles. The content of inert particles of A and B (w
(t%) satisfies the following condition. A / B = 0.1 or more and 10.0 or less ... (1) A + B = 0.05 wt% or more and 5 wt% or less ... (2) 2. The conjugate fiber according to claim 1, wherein the conjugate fiber is a core-sheath type conjugate fiber. 3. The conjugate fiber according to claim 1, wherein the conjugate fiber is a side-by-side type conjugate fiber. 4. The conjugate fiber according to claim 1, wherein component A or component B is exposed on a part of the fiber surface. 5. The conjugate fiber according to claim 1, wherein the inert particles are titanium oxide. 6. A non-woven fabric comprising the conjugate fiber according to any one of claims 1 to 5.