JPS63105191A - Synthetic leather of suede tone and production thereof - Google Patents

Abstract

PURPOSE:To obtain the titled synthetic leather having excellent tear strength and burst strength without requiring reinforcement through backing, by napping the surface layer face of warp fabric substrate made into a specific knitting construction with polyamide multifilament yarn and forming a porous resin layer on the napped face. CONSTITUTION:Polyamide yarn satisfying total deniers of 50-100d numbers is used to produce warp fabric consisting of a surface side knitted by racked stitch having four or five needles, a middle side knitted by racked stitch in different directions by the use of the two yarns with three or less needles, respectively and a back side by a front reed, a middle reed and a back reed. Filament yarn set in the front reed is napped, the napped surface is impregnated with a resin and a porous resin layer is formed to give suede-like synthetic leather having >=3.0kg tear strength and >=15kg/cm burst strength. The leather is suitable as a reinforcing material for high-quality sport shoes.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to suede-like synthetic leather and a method for producing the same, and more specifically, it has a tear strength of 3.0 kg or more and a burst strength of 1.
The present invention relates to a suede-like high-strength synthetic leather having a weight of 5 kg/crA or more and suitable for use as reinforcing members in high-grade sports shoes, particularly for front legs, eyelets, heels, etc., and a method for producing the same.

Conventional technology Traditionally, suede-like synthetic leather is produced by raising knitted or woven fabrics made of polyester synthetic fiber threads, polyamide synthetic fiber threads, etc., and using this as a base material, the raised surface is impregnated with resin. After forming a porous layer, the surface thereof is subjected to a grinding process such as puffing or skiving.

However, the conventional synthetic leather as described above is not suitable for use in high-end sports. That is, the synthetic leather used for high-class sports has a tear strength of 3.0 kg or more, preferably 4.0 kg or more, and a burst strength of 15 kg/c+A or more, preferably 20 kg/
Although it is known from experience that having a+1 is essential, conventional synthetic leathers such as those described above do not have such strength. To achieve this, conventionally, the above-mentioned strength has been obtained by pasting woven, knitted, or non-woven fabrics, etc., as a backing on the back side of synthetic leather, which increases the number of processing steps and increases the product price. I have no choice but to.

Furthermore, since conventional synthetic leather has a large difference in elongation in the longitudinal and lateral directions, it has directional properties when cut appropriately, resulting in poor workability and processability.

In addition, in recent years, there has been a strong demand for clearly colored designs for sports, but synthetic leather based on knitted or woven fabrics made of polyester threads has poor dyeability. Unable to meet the above requirements.

The present invention was made to solve the above-mentioned problems with conventional synthetic leather, and it satisfies the above-mentioned strength requirements without reinforcement with a backing. , high-strength suede-like synthetic leather that can be dyed vividly and robustly.
In particular, tear strength: 3.0 kg or more, burst strength: 15 kg/
The present invention relates to a suede-like synthetic leather having a size of cm2 or more and suitable for use as a reinforcing member in high-end sports, and a method for producing the same.

Means for Solving the Problems The suede-like synthetic leather according to the present invention has a raised surface on the front side.
It is made of polyamide multifilament yarn with a waving width of 4 or 5 needles, raised, and formed into a porous layer by resin processing, and the inside and back sides are made of polyamide multifilament yarn. Thread 2
Each book is knitted with 3 stitches or less in different directions, and has a tear strength of 3.0 kg or more and a burst strength of 15 kg/c.
m2 or more.

In addition, in accordance with the present invention, such synthetic leather can be produced using a polyamide multifilament yarn with a total denier of 50 to 100 deniers using a threading machine with three layers. Sa≧Hack reed, and the middle reed and hack reed are knitted in different directions, and the front reed is knitted with a width of . or 5 stitches to form a warp knitted fabric, Next, the polyamide multifilament threads placed on the front side of this warp knitted fabric are brushed and impregnated with resin to form a porous layer.
It can be manufactured by grinding its surface.

The present invention will be explained in detail below.

The warp fabric made of polyamide multifilament yarn used as the base material of the suede-like synthetic leather according to the present invention is
It is a warp-knitted fabric made by a warp knitting machine with three reeds, and the hem is created by the front reed, middle reed, and back reed! rJl weave, and the front raised surface has 4 multifilament threads.
It has a demand Ml weave which is knitted with swing knitting having a swing width of needles or 5 needles, and two multifilament yarns on the middle side and back side have a swing width of middle side ≧ back side, and each has a swing width of 3 needles or 5 needles.
It has a knitting structure that is knitted in different directions below the needles.

In the present invention, the swing width means the number of crossing needles, as shown in FIG. 1, and kQ Mi as shown in FIG.
The swing width in N'S is multifilament yarn a
It starts from 1, winds needle A and reaches 0,
Next, wind the needle from crossing 3 to reach 4, then start again from crossing 1 and wind needle A to reach 0.
This process is repeated to form a knitted structure, so 1-
This is the 4-stitch swing width expressed as 0/3-4. Similarly, the stitch width in the knitting structure shown in FIG. 2 is a five-stitch stitch width expressed as 1-0/4-5. These stitch widths are referred to as closed stitch widths, but in the present invention, the stitch width may be four stitches or five stitch widths, which are referred to as open stitch widths.

For example, FIG. 3 shows a 4jl swing width of the opening expressed as O-1/4-3.

In the present invention, the knitting structure of the front reel has a width of 4 stitches or 5 stitches. When the swing width is less than 4 stitches, for example, in swing knitting knitting such as 1-0/2-3 or 0-1/3-2, the multifilament yarn arranged in the front is raised. When I do this, the nap does not stand up well. Therefore, even if such a raised surface is impregnated with resin and made into a porous layer, the resulting synthetic leather will have a small fiber layer (and a large resin layer, so it will not have a suede-like appearance, which will reduce the appearance and commercial value. On the other hand, if the swing width exceeds 5 stitches, for example, in the swing knitting of 1-015-6 (closed stitch) or 0-115-6 (open stitch), the front side Since there are too many fiber layers, when this is raised, there will be too many naps and the yarn layer will be too thick.Therefore, the raised surface is processed to contain a resin,
Even if a foam layer is formed, it is difficult to obtain synthetic leather having a foam layer with a homogeneous surface, and pinholes may occur on the surface.

In the present invention, in order for the synthetic leather to have the required strength, the total denier of the polyamide multifilament yarn used for knitting the warp knitted fabric that is the base material, and the It is necessary for the flat M1 weave to satisfy predetermined conditions.

First, the polyamide multifilament yarn used for knitting the warp knitted fabric has a total denier of 50 to 100.
It must be denier.

That is, if the total denier number is less than 50 deniers, the above-mentioned required strength cannot be imparted even by the knitting according to the present invention.On the other hand, if the total denier number exceeds 100 deniers, as shown in FIG. Similarly, since the knitted fabric density, expressed as the number of courses x the number of wells in the knitted fabric, becomes coarser,
Even the knitting according to the invention cannot provide the above-mentioned required strength.

Next, the width of the knitting structure of the middle reed and the back reed satisfies the condition that the front reed > the middle reed ≧ the back reed, and the knitting structures of the middle reed and the back reed are in opposite directions. It is necessary to knit with the same width. This is because if the swing widths of the front reed, middle reed, and back reed do not satisfy the above conditions, the resulting warp knitted fabric will have significantly poor napping properties. In order to satisfy the condition of the above-mentioned stitch width, as mentioned above, the stitch width in the front reel knitting m weave is 4 stitches or 5 stitches, so in the present invention, for example, the middle recess is 1-0/1-0/5 stitches. 2-3 or 0-1/3
-2, etc., and the hack reed can be set to 1-2/1-0, etc. On the other hand, when the knitting structures of the middle reed and the hack reed have the same direction of amplitude, the multifilament yarns are aligned with almost no crossing, so it is particularly difficult to provide the predetermined tearing strength. Therefore, in the present invention, the middle and back klMi weaves are knitted with swing widths in different directions.

The noodle fabric knitted in the above manner is scoured and relaxed in accordance with conventional methods, dyed and dried, and the multifilament threads placed on the front sash are brushed. The high-strength suede-like synthetic leather according to the present invention can be obtained by forming a resin porous layer on the raised surface of the knitted fabric by a conventionally known method, such as a wet method or a dry method. Of course, the knitted fabric may be raised first and then refined and relaxed. The resin used here is not particularly limited, but for example,
Polyurethane resins and polyvinyl chloride resins are preferably used.

Effects of the Invention As described above, the synthetic leather according to the present invention is made of polyamide multifilament yarn having a predetermined total denier so that the front side, middle side, and back side have a predetermined number of stitch widths and a predetermined stitch width direction. It is knitted with a swing knit, the front side is raised, and a porous resin layer is formed on this raised surface, so it has a tear strength of 3.0 kg or more and a burst strength of 15 +r/
It has cn1 or more, and therefore can be suitably used as a reinforcing member for sports shoes without backing.

Furthermore, since the synthetic leather according to the present invention has the above-mentioned knitting structure, the difference in elongation in the longitudinal and lateral directions, that is, the directionality is small, and therefore, for example, it has poor workability and processability in shoe manufacturing. Furthermore, since the base material is made of knitted fabric, no fraying occurs at the cut edges, making it possible to manufacture sports shoes with an excellent appearance. In addition, the synthetic leather according to the present invention has multifilament yarns made of polyamide-based synthetic fibers, so it can be dyed vividly, and
Dyed synthetic leather has excellent abrasion fastness.

disaster practice rotation The present invention will be explained below with reference to Examples.

Example 1 As yarns, polyamide synthetic fiber multifilament yarns of 70 denier x 24 filaments on the front side, 50 denier x 10 filaments on the middle side, and 70 denier x 24 filaments on the hack side were used to create a knitted structure. Front receptacle 1-0/3-4 (stitch width 4 stitches),
As shown in Figure 4, the middle reel 1-0/2-3 (
3 stitches), as shown in Figure 5, back reed 1-2
/1-0 (stitch width: 2 stitches), using a Karl Mayer Keisei machine (28 gauge x 130 inches A tV knitted fabric with 40 courses and 40 wells was manufactured.

This was scoured, relaxed, dyed, dried, and the multifilament threads arranged in the front sash were brushed according to a conventional method.

Next, 100 parts by weight of a dimethylformamide solution containing 30% by weight of polyester urethane elastomer, 4 parts by weight of pigment, and 7 parts by weight of dimethylform were applied to the raised side of the raised knitted fabric.
A resin solution consisting of 60 parts by weight of Midium and 6 parts by weight of water was applied at a rate of 1000 g/m using a doctor knife, and then immersed in a water bath adjusted to a bath temperature of 20°C for 5 minutes.
The urethane resin was wet-formed and formed into a foamed porous layer.

Thereafter, after washing with hot water at a temperature of 50 to 60°C, the water was removed from the resin layer, and the resin layer was dried at 120°C for 10 minutes to a thickness of 1.
A synthetic leather of 5 x m was obtained. Next, the surface is #120
After rough cutting with a huffing machine equipped with mesh sandpaper, finish grinding was performed with #180 mesh sandpaper to obtain suede-like synthetic leather of the present invention with a thickness of 1.4**.

Example 2 100 parts by weight of polyvinyl chloride base resin, 80 parts by weight of plasticizer dioctyl phthalate, 4 parts by weight of pigment, 3 parts by weight of barium/zinc stabilizer, and an azo-based stabilizer were added to the raised side of the raised knitted fabric obtained in Example 1. After applying and impregnating a paint consisting of 3 parts by weight of a foaming agent at a rate of 400 g/rd using a doctor knife, the coating was heated and foamed at 190°C for 2 minutes to a thickness of 1.
81 synthetic leathers were obtained.

Next, the surface is roughly roughened with a puff machine equipped with #120 mesh sandpaper, and then finish ground with #180 mesh sandpaper to achieve a thickness of 1.5 mm according to the present invention.
Obtained 4 dragon suede-like synthetic leather.

Comparative Example 1 Using the same yarn as in Example 1, the knitting structure was made into a front 1-
0/3-4 (stitch width 4 stitches), middle reas 1-0/2
-3 (stitch width 3 stitches), back reed 1-0/1-2 (
A warp knitted fabric with a finish density of 60 courses x 40 wells was produced with a swing width of 2 stitches) and the swing widths of the middle reed and back reed in the same direction, and after being brushed by the same process as in Example 1, A suede-like synthetic leather was obtained by the same dry method as in Example 2.

Comparative Example 2 As yarns, polyamide synthetic fiber multifilament yarn of 70 denier x 24 filaments on the front side and 70 denier x 24 filaments on the back side was used, and the knitting structure was changed to 1-0/4- on the front side. 5 (stitch width: 4 stitches), back sash l-2/1-0 (stitch width: 2 stitches)
A warp knitted fabric with a density of 60 courses x 40 wells was manufactured with different direction swing widths. After this was brushed and finished by the same treatment as in Example 1, a suede-like synthetic leather was obtained by the same dry method as in Example 2.

Table 1 shows the physical properties of each of the synthetic leathers obtained as described above. The tear strength is measured according to JIS K-
6172 method, and the bursting strength can also be measured by
Each method was based on the method of SL-1018A.

The suede-like synthetic leather according to the present invention has a tear strength of 4 kg.
It has a bursting strength of 20 kg/cn1 or more, and a difference in elongation (vertical direction - horizontal direction) of 15% or less.

On the other hand, the synthetic leather according to Comparative Example 1 obtained in the same manner as Example 1 except that the width of the middle reed and the back reed were in the same direction in knitting X and weaving, the tear strength was in the direction The weight is less than 3.0 kg, and the bursting strength is 20
less than kg/ca. Furthermore, the difference in elongation reaches 30%. In addition, as an example of traditional synthetic leather,
Comparative example 2 where the knitting structure is front and back.
Synthetic leather has a tear strength of 3 kg or more and a burst strength of 2
It does not meet the requirement of 0 kg/crA or more, and the difference in elongation is large.

[Brief explanation of the drawing]

Figures 1 to 5 are knitting diagrams each showing the swing width in swing knitting. In the figures, the numbers indicate the crossing numbers, a indicates the multifilament yarn, A, B
, C and D indicate crossing needles. Patent Applicant Band - Kagaku Co., Ltd. Figure 1 Lae, Shi Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) The raised surface on the front side is made of polyamide multifilament yarn knitted with a swing width of 4 or 5 needles, raised, and formed into a porous layer by resin processing. The middle and back sides are made of two polyamide multifilament yarns knitted in different directions with 3 needles or less each, and have a tear strength of 3.0 kg or more and a burst strength of 15 kg/cm^2 or more. Features suede-like synthetic leather. (2) Total denier 50-1 on a 3-ply warp knitting machine
00 denier polyamide multifilament yarn is set so that the swing width of each reel is set as front reel > middle reel ≧ back reel, and the swinging directions of the middle reel and back reel are different directions, and the front reel is A warp-knitted fabric is created by knitting with a swing width of 4 or 5 stitches, and then the polyamide multifilament yarn arranged on the front of this warp-knitted fabric is raised, and resin is applied to the raised surface. 3. Tear strength characterized by impregnating the material to form a porous layer and grinding the surface. A method for producing suede-like synthetic leather having a weight of 0 kg or more and a bursting strength of 15 kg/cm^2 or more.