JP2002339164A - High-elongation polyamide fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-elongation percentage polyamide fiber advantageous in terms of cost because of needing no after-processing, and to provide a nonwoven fabric having a sufficiently high elongation percentage using the polyamide fiber. SOLUTION: This high-elongation percentage polyamide fiber is characterized by consisting mainly of a nylon 6 resin and containing 1-20 wt.% of a nylon 610 resin and/or nylon 612 resin; wherein the respective relative viscosities of the nylon 610 resin and the nylon 612 resin are higher than that of the nylon 6 resin by >=0.5. A nonwoven fabric comprising the high-elongation percentage polyamide fiber is also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a polyamide fiber having a high elongation.

[0002]

2. Description of the Related Art Conventionally, polyamide fibers have been widely used mainly for clothing. However, it is difficult to obtain a sufficiently satisfactory elongation with a fiber using a nylon 6 resin, a nylon 66 resin, or the like, which is a typical polyamide fiber. In addition, since the elongation of the fiber itself is low, the elongation of a nonwoven fabric made of these polyamide fibers is never sufficient.

Various proposals have been made to improve the elongation of polyamide fibers. Specifically, a method of solvent-treating or heat-treating a semi-drawn or undrawn polyamide fiber (for example, Japanese Patent Application Laid-Open No. 52-740)
No. 18), the stretched polyamide fiber has a carbon number of 1 to 1.
(3) a method of treating with n-alcohol (for example,
Japanese Patent Application Laid-Open No. H08-66181), a method for producing a thick and thin processed yarn having a cross-sectional area that varies along the fiber axis direction.
No. 9472), a method of disposing two kinds of polyamides having different viscosities in a side-by-side type to form a latent crimped yarn (for example, JP-A-2000-27031).

[0004] However, these methods have problems such as inferior dimensional stability and necessity of post-processing and a special production method because undrawn yarn is used.

[0005]

DISCLOSURE OF THE INVENTION The present invention is advantageous in terms of cost without the need for post-processing, is easy to manufacture, and can provide a nonwoven fabric having sufficient elongation when used for a nonwoven fabric. It is an object of the present invention to provide a high elongation polyamide fiber.

[0006]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, by combining a specific nylon resin, it is possible to obtain a polyamide fiber having a significantly improved elongation. It was found that the obtained effects were different due to the difference in relative viscosity between the resins, and the present invention was reached.

That is, the present invention comprises a nylon 6 resin as a main component, contains 1 to 20% by weight of a resin selected from a nylon 610 resin and / or a nylon 612 resin, and has a relative viscosity of less than that of the nylon 6 resin. A high elongation polyamide fiber characterized in that the relative viscosity of nylon 610 resin and nylon 612 resin is higher by 0.5 or more, and a nonwoven fabric made of the polyamide fiber.

The nylon 6 resin, nylon 610 resin, and nylon 612 resin are -OC (CH ₂ ) ₆ NH, respectively.
_{-, - NH (CH 2)} 6 NHOC (CH 2) 8 CO -, - NH (CH 2) 6 NHOC (CH 2)
_A polyamide resin composed of repeating units of ₁₀ CO-. Hereinafter, the present invention will be described in detail. The relative viscosity of the nylon 6 resin used in the present invention is not particularly limited, but in order to obtain long fibers by a conventional melt spinning method, the relative viscosity is preferably 2.0 to 4.0 from the viewpoint of productivity. Those in the range are preferably used.

The relative viscosity of the nylon 610 resin and the nylon 612 resin used in the present invention is preferably higher than the relative viscosity of the nylon 6 resin by 0.5 or more.
It is more preferable that the value is 0 or more. Nylon 610 resin,
When the relative viscosity of the nylon 612 resin is within the above range,
A sufficient elongation improvement effect can be obtained. In addition, nylon 61
The upper limits of the relative viscosities of the No. 0 resin and the nylon 612 resin are not particularly limited, but from the viewpoint of productivity, 6.0 or less is preferably used in order to obtain long fibers by a conventional melt spinning method.

In the present invention, nylon 6 as a main component is used.
The content of the resin selected from nylon 610 resin and / or nylon 612 resin is 1 to 20 w
t% is preferred, more preferably 3 to 15 wt%, and particularly preferably 3 to 10 wt%. Nylon 6
10 resin or nylon 612 resin
-20 wt% may be contained, or both may be contained simultaneously and the total may be 1-20 wt%. Nylon 6
When the content of the resin selected from the No. 10 resin and / or the nylon 612 resin is in the above range, no yarn breakage occurs and a polyamide fiber having a sufficient elongation can be stably obtained.

In the present invention, the reason why the above-described excellent effects are obtained is not necessarily clear, but a resin selected from nylon 610 resin and / or nylon 612 resin having a relative viscosity higher than that of nylon 6 resin by 0.5 or more is provided. Is 1 to
It is presumed that by containing 20 wt%, the stretch orientation of the nylon 6 resin is suppressed, and a polyamide fiber having a low modulus and a high elongation is obtained. Such a suppressing effect on the stretching orientation may have a large effect on the relative viscosity and the content of the nylon resin to be contained, and it may be preferable that the nylon resin having a high relative viscosity is appropriately dispersed in the nylon 6 resin. Inferred.

Further, in the present invention, other nylon resins may be added to the above-mentioned nylon 610 resin and nylon 612 resin according to required properties such as moldability, heat resistance, toughness, surface properties and the like. As other nylon resins,
For example, a nylon 4 resin, a nylon 11 resin, a nylon 12 resin, a nylon 66 resin, a nylon 46 resin, and a mixture or a copolymer thereof are exemplified.

Further, the high elongation polyamide fiber of the present invention may contain other commonly used additives such as an impact modifier such as various elastomers, a crystal nucleating agent, and the like, as long as the object of the present invention is not impaired. Tinting inhibitor, hindered phenol,
Antioxidants such as hindered amines, release agents such as ethylenebisstearylamide and higher fatty acid esters, heat-resistant agents such as copper compounds represented by copper halides, epoxy compounds, plasticizers, lubricants, weathering agents, flame retardants, coloring An additive such as an agent can be added.

In the present invention, the cross-section of the high elongation polyamide fiber may be a circular or elliptical shape, a polygonal shape such as a triangle or a square, a flat cross-section or a hollow cross-sectional shape, and the fineness is not particularly limited, and the required characteristics are not particularly limited. Can be set as desired. Also, regarding the form of the fiber, monofilament,
Any form such as multifilament or staple may be used.

The high elongation polyamide fiber of the present invention is obtained by a known method, and there is no particular limitation on the production method. The polyamide fiber is mainly composed of nylon 6 resin, and is made of nylon 610 resin and / or nylon. What is necessary is just to contain a predetermined amount of resin selected from 612 resin, for example, it is obtained by the following method. The fibers may be formed by melt spinning using a commonly used spinneret. Nylon 610
In order to contain resin and / or nylon 612 resin,
There are a method of forming a masterbatch into nylon 6 resin, a method of mixing by dry blending, and the like, but it is preferable to employ a dry blend method from the viewpoint of cost. Then, the spun yarn is subjected to stretching or heat treatment after cooling, and is wound up. At this time, either a two-step method in which the spun yarn is once wound and then stretched and heat-treated, or a one-step method in which the spun yarn is stretched and heat-treated without winding once, may be adopted.

Further, the high elongation polyamide fiber of the present invention may be provided with other usual post-processing such as a flame retardant, a deodorant, an antibacterial agent, an acaricide, etc. within a range not to impair the object of the present invention. Or dyeing, water-repellent processing, moisture-permeable waterproofing processing, or the like. The high elongation polyamide fiber of the present invention may be knitted or woven alone or in combination with other fibers. As a method of mixing with other fibers, mixed fiber, plying, ply twisting, weaving,
Various methods such as knitting and blending can be used.

The high elongation polyamide fiber of the present invention has an elongation at break of up to 200%, which is equal to or more than 2.5 times that of a normal polyamide fiber. It can be widely used for various applications that have been unusable. In addition, the high elongation polyamide fiber obtained by the present invention has a low modulus, and the modulus at 20% elongation is about half that of the conventional polyamide fiber, so that processing with a small deformation stress becomes possible. .

The method for producing the nonwoven fabric comprising the high elongation polyamide fiber of the present invention is not particularly limited. For example, when manufacturing a non-woven fabric using the high elongation polyamide fiber of the present invention, a step of forming a fiber into a sheet and forming a web, and a step of bonding or tangling the fibers in the web to form a cloth. May be performed in two steps or in one step.

Either a short fiber or a long fiber may be used as the fiber constituting the web, and the forming method may be a dry method such as carding or air lay, a wet method such as papermaking, or a spun bond method. Any method such as a direct spinning method represented by a melt blow method may be used. Furthermore, as a method of bonding or intertwining the web, a thermal bonding method such as a chemical bonding method of bonding the fibers in the web using an adhesive, a calendering method, a through air heating method, a needle punching method, a hydroentangling method Any method such as a mechanical bonding method such as a stitch bonding method or a stitch bonding method may be used.

Above all, the nonwoven fabric obtained by the spun bond method is made by directly forming long fibers into webs without passing through short fibers, so that the fabric strength is high and the short fibers do not fall off due to breakage of the bonding portion. Because of its high physical properties, high productivity, and many advantages over card-type short-fiber nonwoven fabrics, it has been used in a wide range of applications, mainly in sanitation, civil engineering, construction, agriculture and horticulture. It is suitable as a nonwoven fabric made of a high elongation polyamide fiber.

The shape, form, and basis weight of the non-woven fabric comprising the high elongation polyamide fiber of the present invention can be arbitrarily set according to the required characteristics. It should be noted that the nonwoven fabric made of the high elongation polyamide fiber of the present invention can be subjected to printing, dyeing, coating processing, and the like, and there is no problem even if different types of materials, manufacturing methods, and products are combined.

The nonwoven fabric comprising the high elongation polyamide fiber of the present invention can be widely used in applications where conventional polyamide nonwoven fabrics are used. For example, apparel applications such as apparel members, disposable apparel, shoe materials, protective use such as protective clothing and protective supplies, medical use such as surgical gowns, masks and haptic base fabrics, roofing, tuft carpet base fabrics, dew condensation prevention sheets Such as architectural uses, civil engineering applications such as reinforcing materials, protective materials, repair materials for underground pipes, vehicle interiors such as automobile interiors and automobile parts, emergency supplies, cleaning supplies, sanitary uses such as towels, carpets, furniture components, Furniture / interior use such as wallpaper, wiper use such as wet wiper and cleaning material, filter use such as air filter, bag filter, electret filter, bedding use such as futon, futon bag, pillow cover, sticky sheet, grass proof Agricultural and horticultural applications such as seats and horticultural planters, artificial leather base fabric, synthetic leather base fabric, PVC leather base fabric, etc. Of artificial leather such base fabric applications, storage products, packaging materials, living materials applications such as kitchen utensils, electrical material, or the like industrial materials applications such as product material, equipment member.

In particular, the nonwoven fabric made of the high elongation polyamide fiber of the present invention has a low modulus and a high elongation at break, so that it is suitable as an advanced molded member accompanied by large elongation and complicated shape deformation. For example, car interior materials such as door trims, ceiling molding materials, sheet lining cloth, etc., food filter bags such as green tea, black tea, coffee, etc., and volatile medicine containers such as insect repellents, fragrances and the like can be mentioned.

[0024]

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto. In addition, the measuring method, the evaluation method, etc. are as follows. (1) Relative viscosity A 98% sulfuric acid was used as a solvent, and the relative viscosity was measured with an Ostwald viscometer at a concentration of 1 g / dl and a temperature of 25 ° C.

(2) Yarn strength and elongation Using a Tensilon STM101 manufactured by Toyo Baldwin Co., twisting was performed twice / 50 mm at a gripping interval of 100 mm, and the yarn was elongated at a pulling speed of 200 mm / min. Was converted to a unit fineness to obtain strength, and an average value of five measurements was obtained.

Further, the average value of the elongation at the time of cutting obtained in the same manner was defined as the elongation. (3) Strong elongation of non-woven fabric Using Autograph AGS-5G type manufactured by Shimadzu Corporation,
A sample having a width of 3 cm is gripped at an interval of 100 mm and a pulling speed of 2
The nonwoven fabric was stretched at 00 mm / min, and the obtained load at the time of cutting was defined as the strength. Ten measurements were performed in each of the vertical (MD) direction and the horizontal (CD) direction of the nonwoven fabric, and the total average value was obtained.

Further, the total average value of the elongation ratio at the time of cutting obtained in the same manner was defined as the elongation. Example 1 Nylon 6 resin having a relative viscosity of 2.5 was mixed with nylon 610 resin having a relative viscosity of 3.4 by dry blending so as to have a content of 5 wt%, and supplied to a conventional melt spinning apparatus. . Next, the mixture is melt-mixed uniformly at 270 ° C., melt-spun from a spinneret having a circular cross-section spinning hole, taken up at a speed of 4000 m / min, and 1.95 dtex.
Was obtained. Table 1 shows the yarn strength and elongation of this polyamide fiber. The elongation was as high as 210%.

Example 2 A polyamide fiber was obtained in the same manner as in Example 1 except that the content of the nylon 610 resin was 3 wt%. Table 1 shows the yarn strength and elongation of this polyamide fiber. The elongation was as high as 192%. [Example 3] In Example 1, except that the content of nylon 610 resin was mixed so as to be 10 wt%.
A polyamide fiber was obtained in the same manner as in Example 1. Table 1 shows the yarn strength and elongation of this polyamide fiber. The elongation was as high as 215%.

Example 4 A polyamide fiber was obtained in the same manner as in Example 1, except that the content of the nylon 610 resin was changed to 20 wt%. Table 1 shows the yarn strength and elongation of this polyamide fiber. The elongation was as high as 134%. Example 5 A polyamide fiber was obtained in the same manner as in Example 1 except that nylon 610 resin having a relative viscosity of 5.2 was used. Table 1 shows the yarn strength and elongation of this polyamide fiber. The elongation was as high as 207%.

Example 6 A polyamide fiber was prepared in the same manner as in Example 1 except that the relative viscosity of the nylon 6 resin was 3.2 and the relative viscosity of the nylon 610 resin was 4.1. Obtained. Table 1 shows the yarn strength and elongation of this polyamide fiber. The elongation was as high as 147%.

Example 7 In Example 1, nylon 612 having a relative viscosity of 3.2 was used instead of nylon 610 resin.
A polyamide fiber was obtained in the same manner as in Example 1 except that a resin was used. Table 1 shows the yarn elongation of this polyamide fiber.
Shown in The elongation was 107%, which was rather high.

[Examples 8 and 9] The polyamide fiber obtained in Example 1 was spread and dispersed to form a web, and was subjected to partial thermocompression bonding between an embossing roll and a flat roll to obtain 10 g.
/ M ² (Example 7) and 40 g / m ² (Example 8) were prepared. Table 1 shows the strength and elongation of the nonwoven fabric. The obtained nonwoven fabric had high elongation.

Comparative Example 1 A polyamide fiber was obtained in the same manner as in Example 1, except that the nylon 6 resin was changed to 100 wt%. Table 1 shows the yarn strength and elongation of this polyamide fiber. The elongation was 77%. Comparative Example 2 A polyamide fiber was obtained in the same manner as in Example 1, except that the amount of the nylon 610 resin was changed to 100 wt%. Table 1 shows the yarn strength and elongation of this polyamide fiber. The elongation was 77%.

Comparative Example 3 A polyamide fiber was obtained in the same manner as in Example 1, except that nylon 610 resin having a relative viscosity of 2.5 was used. Table 1 shows the yarn strength and elongation of this polyamide fiber. [Comparative Examples 4 and 5] The polyamide fiber obtained in Comparative Example 1 was spread and dispersed to form a web, and partially thermocompression-bonded between an emboss roll and a flat roll, and 10 g / m ² (Example 7). , And 40 g / m ² (Example 8). Table 1 shows the strength and elongation of the nonwoven fabric.
The obtained nonwoven fabric had lower elongation than the nonwoven fabrics obtained in Examples 8 and 9.

[0035]

[Table 1]

[0036]

Industrial Applicability The high elongation polyamide fiber of the present invention does not require post-processing, is advantageous in cost, and has high elongation. Further, the nonwoven fabric made of the high elongation polyamide fiber of the present invention has a sufficiently high elongation and can be suitably used for applications requiring high elongation.

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Claims (2)

[Claims] Claims: 1. A composition mainly composed of a nylon 6 resin,
A resin selected from nylon 610 resin and / or nylon 612 resin is contained in an amount of 1 to 20 wt%, and the relative viscosity of nylon 610 resin and nylon 612 resin is higher than the relative viscosity of nylon 6 resin by 0.5 or more. Characteristic high elongation polyamide fiber. 2. A non-woven fabric comprising the high elongation polyamide fiber according to claim 1.