JPH02277890A - Leather-like sheet - Google Patents

Abstract

PURPOSE:To provide a leather-like sheet balanced in the thickness, flexibility, rigidity and others thereof by integrating a web comprising specific polyester fibers having a latent spontaneous elongating property with a web comprising specified denier fibers and having a specific density and subsequently allowing the polyester fibers to exhibit the spontaneous elongating property. CONSTITUTION:A web comprising latent spontaneously elongating polyester fibers having a spontaneous elongating property of at least 5% on heating at 180 deg.C in a tension-free state and a woven or knitted fabric comprising filaments or spun yarns having a total deniers of 30-200 deniers and having a woven fiber density or knitted fiber density of 15-80 fiber/inch are superimposed upon each other and subsequently subjected to a needle-punching process to give a mutually interlaced, integrated fabric, followed by treating the fabric at a temperature causing the spontaneous elongation of the polyester fibers to give a fibrous substrate generated the spontaneous elongating property, which is treated with a polymer elastomer such as a polyurethane to provide a leather- like sheet having balanced thickness, flexibility, rigidity and flexural fatigue strength suitable for uses. The sheet is used for the wide fields such as shoes and furnitures.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has abundant flexibility and appropriate difficulty in stretching,
This invention relates to a leather-like sheet material that satisfies processability and practicality for processing shoes, furniture, chairs, etc.

[Conventional technology]

As a leather-like sheet-like material, it can be made to have an appropriate thickness to satisfy processing requirements or practical requirements, such as flexibility, bending fatigue strength, and difficulty in elongation, in a balanced manner, and to meet the suitability of the application. It is necessary.

However, when conventional nonwoven fabrics are used as base fabrics for leather-like sheets, if they have good flexibility, they become easy to stretch, and if they are difficult to stretch, they become hard, and it is difficult to balance both properties.

In addition, when using woven or knitted fabrics, although it is easy to achieve stretchability, it is difficult to obtain thick sheet-like products such as those for shoes, and the appearance is unsatisfactory, such as fibers fraying at the cut ends. there were.

It is also known to overlap woven or knitted fabrics and webs to form a single body, but this eliminates the disadvantages of using only woven or knitted fabrics with ordinary fibers, but it is difficult to I didn't get anything.

[Problems to be Solved by the Invention] The present invention has been made against the background of the above-mentioned problems of the prior art. The purpose of the present invention is to provide a leather-like sheet-like material having well-balanced properties.

[Means for Solving the Problems] The present invention provides a web consisting primarily of latent spontaneously extensible polyester fibers having a spontaneous extensibility of at least 5% when heated to 180°C under no tension, and a web comprising a web consisting primarily of latent spontaneously extensible polyester fibers having a total denier of 30°C.
A latent spontaneously extensible polyester fiber, which is formed by intertwining and integrating a woven or knitted fabric made of ~200 denier long fibers or spun yarn with a weaving density or knitting density of 15 to 80 fibers/inch, respectively. The present invention provides a leather-like sheet material based on a fibrous base material that exhibits spontaneous extensibility.

In order to achieve the present invention, first, 180'
A web is made consisting primarily of latent spontaneously extensible polyester fibers having a spontaneously extensible property of at least 5% when heated to C.C. As a latent spontaneously extensible fiber that satisfies this condition, for example, a polyester having fiber-forming ability mainly composed of polyethylene terephthalate is spun using a known method, and the resulting undrawn yarn is stretched at a stretching ratio of 60°C in hot water. 2
．． It can be obtained by further processing and drying the stretched material at 0 to 2.7 times in hot water at 70°C.

The web can be created by opening the polyester staple fibers using a normal card or the like, and then using a random univer or crosslayer.

The woven fabric and knitted fabric used for the fibrous base material of the present invention have a total denier of 30 to 200 deniers, preferably 50 to 1
Synthetic fibers made of 50 denier long fibers or spun fibers,
It is made of natural fibers or a mixture of these fibers,
In addition, for woven fabrics, the number of warp and weft fibers per inch, and for knitted fabrics, the number of well and course fibers per inch (in the present invention,
(defined as "weaving density" or "knitting density" respectively) is 15 to 80 wood/inch. Total denier is 50
If the denier is less than 1, the fibers will be thin and lack strength;
If it exceeds 0.00 denier, the fibers are too large and the stitches of the woven or knitted fabric tend to appear on the web, which is not preferable.

In addition, if the weaving density or knitting density is less than 15 threads/inch, the strength of the woven or knitted fabric is insufficient, and the weave is too coarse, making it easy to see the weave or stitches.On the other hand, if the weaving density exceeds 80 threads/inch, The knitting density is too dense, making it difficult to remove entanglements with web fibers.

To overlap a web and a woven or knitted fabric, the woven or knitted fabric may be placed inside the web or placed on one side of the web, but the textures or stitches may appear on the surface of the web. It is preferable to adjust the weight of the web so that it does not.

The method of entangling the web and woven or knitted fabric is as follows:
The needle punching method, jet water flow method, etc. can be used. In order to achieve the purpose of the present invention, it is necessary that the woven fabric or knitted fabric and the web are integrated without peeling, and the degree of entanglement caused by needle punching, jet water flow, etc. It is desirable to take enough according to the situation.

In addition, in the entanglement treatment, if the entanglement treatment/processing is performed mainly from the web side, there is less cutting of the woven fabric or knitted fabric by needle punching, jet water flow, etc., and therefore the decrease in strength is smaller. Also, when a woven or knitted fabric is placed on one side of the web, the fluff of the web due to the entanglement process creates a texture.
Preferably in order to make the stitches less visible, the web obtained by entangling and integrating with the woven or knitted fabric is then heat-treated at a temperature at which the spontaneous elongation properties of the latent spontaneously elongated polyester fibers can be expressed, and then or simultaneously the surface is Apply heat and pressure to smooth it.

In the present invention, the web made of polyester fibers having latent spontaneous elongation is used in combination with a woven or knitted fabric.The reason why the web made of polyester fibers having latent spontaneous elongation is used is that by developing spontaneous elongation, the free fiber length is lengthened by spontaneous elongation between entangled points. This is because it is possible to obtain a leather-like sheet material that is highly soft. Ordinary fibers that do not have spontaneous extensibility do not have this effect.

This spontaneous extensibility is required to be at least 5%, preferably 10 to 20% when heated to 180°C under no tension. In addition, a web made only of spontaneously extensible polyester fibers is highly soft, but has a long free fiber length and tends to stretch easily, so it is possible to overcome this drawback by using it in combination with a woven or knitted fabric. I can do it.

In order to produce a leather-like sheet using the fibrous base material made of the web and woven fabric or knitted fabric thus obtained, the fibrous base material is treated with a polymeric elastic material. Examples of elastomer polymers include polyurethane resins, polyurea resins, synthetic rubbers, vinyl chloride resins, and polyacrylic resins. These polymeric elastomers are solidified in the substrate.

This fibrous base material is made of crosslinkable silicone containing hydrogen polysiloxane etc. before being treated with a polymeric elastomer.
It can be treated in advance with a fluorine-based treatment agent containing a perfluoroalkyl group.

Note that the weight ratio of the fibrous base material and the polymeric elastic body is not particularly limited, but usually per 100 parts by weight of the fibrous base material,
The polymeric elastic body is 10 to 150 parts by weight, preferably 30 to 150 parts by weight.
It is about 100 parts by weight.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples.

Note that parts and percentages in the examples are based on weight unless otherwise specified.

Further, the physical properties described in the following examples were measured by the following method.

(i) Constant Load Elongation A test piece with a width of 8 cm and a length of 15 cm is held at intervals of marked lines of 10 cm, a load of 10 kg is applied to this, and the elongation between the marked lines is measured after 10 minutes.

(ii) After the measurement of constant load set (i), the load is released, and 10 minutes later, the elongation between the marked lines is measured, and this elongation is taken as the constant load set.

(in) seam strength Lay the original fabrics with a width of 2.5 cm and a length of 10 cm face-to-face, and attach polyester sewing thread (20
stitch distance 1.8 to 2.0 with a No. 14 oval needle.
It is expressed as the seam breaking strength when measured at a distance of 10c11 between chucks and an elongation speed of 100%/min with the seam part at the center after sewing at 0.

(iv) Seam fatigue A piece similar to the seam strength measurement piece described above was created, a load of 3 kg was applied to it, the opening of the seam was measured when repeated fatigue was applied 3,000 times, and this length was determined. Display the cabinet.

(v) Flexural fatigue strength Using a JIS K6505.5-2-5 testing machine 5.
The state is expressed after surrendering 000 times.

Example 1 Polyethylene terephthalate (35°C, intrinsic viscosity 0.6 measured in orthochlorophenol) was spun at 280°C, and the resulting undrawn yarn was stretched 2.6 times in warm water at 60°C. Thereafter, it was subjected to shrinkage treatment in hot water at 70°C, treated with an oil agent, and then cut to obtain short fibers with a single yarn denier of 1.5 deniers and a cut length of 5111I11. The spontaneous elongation rate of this fiber at 180°C under no tension was 15%.

Approximately 200 g of this fiber with card and random webber
/n'f web.

Next, four 120 denier/150 filament multifilaments made of polyethylene terephthalate were
00T/m of twist, 40 twists/twist each
This plain woven fabric was layered under the web, and needle punching was performed from the web side to entangle the plain woven fabric and the web. After soaking it in water,
It was vacuum dehydrated and immersed in a solution containing an aqueous dispersion of hydrogen polysiloxane (Boron MNK, manufactured by Shin-Etsu Chemical) and zinc acetate as a catalyst, and the amount of adhesion in terms of siloxane was 0.3%.
After adjusting the wet pickup so that
A woven nonwoven fabric (fibrous base material) of 8 ma+ was obtained.

Next, a dimethylformamide solution of polyurethane resin (manufactured by Dainippon Ink & Chemicals, Grisbon C-3930) was added.
C, concentration 30%) to 100 parts of carbon black, 3 parts of polyethylene oxide modified polysiloxane (manufactured by Dainippon Ink & Chemicals ■, Crisbon Assister N0IO)
A fibrous base material is impregnated with a solution (impregnating stock solution) prepared by adding 1.5 parts of dimethylformamide and 200 parts of dimethylformamide, and then 800 g of a wet solution having the same composition as the impregnating stock solution and a concentration of 17.5% is added to the surface of the material. After immersing in a water bath containing 10% dimethylformamide for 30 minutes, washing with water to remove the solvent, coat the surface with polyurethane resin (manufactured by Dainippon Ink & Chemicals, Crisbon NY-320).
) based black paint gravure about 20g in solid form
/nf coating film was formed, and a kerf pattern was embossed to obtain a sheet.

The obtained sheet had stopped elongating, had good recovery under constant load, and was suitable for lining vehicle seats, furniture, etc.

The results are shown in Table 1.

Comparative Example 1 The same web used in Example 1 was used, except that it was not overlaid with a plain weave fabric made of polyethylene terephthalate.
A sheet was prepared in exactly the same manner as in Example 1.

The obtained sheet was molded into a vehicle seat in the same manner as in Example 1, and a repeated load test was performed. As a result, elongation occurred and the machined seams opened, which was not desirable as a vehicle seat. The results are shown in Table 1. Example 2 Instead of the plain weave used in Example 1, a fabric made of polyester filaments (multifilament of 72 denier/60 filaments) and woven with 40 wool/inch x 28 courses/inch was used. A cloth was used, laminated with the same web as in Example 1, and treated in the same manner as in Example 1 to obtain a sheet.

The obtained sheet had an anti-elongation effect and a good elongation recovery rate under constant load, and was suitable as a coating material for vehicle seats and the like.

The results are shown in Table 1.

Example 3 Instead of the plain woven fabric used in Example 1, a spun yarn (total denier 175 denier) made from polyester short fibers (single yarn 1.5 denier) was used, with a warp of 27 yarns/inch and a weft of 2.
A plain woven fabric of 4 threads/inch was produced, and this and the web produced in Example 1 were overlapped and treated in the same manner as in Example 1 to obtain a sheet.

The obtained sheet had no elongation, had a good recovery rate under constant load, and was suitable as a covering material for vehicle seats and the like. The results are shown in Table 1.

Comparative Example 2 Instead of the plain woven fabric used in Example 3, the same polyester short fibers were used to create a coarse plain woven fabric with warp and weft of 10 fibers/inch each, and the same web as that used in Example 1 was created. Then, the same procedure as in Example 1 was repeated to obtain a sheet.

The surface of the obtained sheet had a somewhat conspicuous lattice pattern of unevenness and had an unfavorable appearance.

The results are shown in Table 1.

Comparative Example 3 Instead of the plain woven fabric used in Example 3, a plain woven fabric with a warp and weft of 120 threads/inch x 90 threads/inch was created using polyethylene terephthalate spun yarn (total denier 5 denier), and this was carried out. Layer needle punching was attempted with the web prepared in Example 1, but the fabric density was too high and it was difficult to remove the entanglement of fibers, resulting in an excessive punching load, which was not desirable.

The results are shown in Table 1.

(Margin below) Table 1 Comparative Example 4 An example using polyethylene terephthalate fiber (single yarn 1.5 denier, cut length 51 nm) that does not have spontaneous extensibility instead of the spontaneously extensible polyester fiber used in Example 1. A sheet was created using the same method as in step 1. The obtained sheet had a lot of bone, lacked softness, and did not have sufficient texture.

〔Effect of the invention〕

The leather-like sheet material of the present invention has a thickness, flexibility, difficulty in stretching, and bending fatigue strength in a well-balanced manner suitable for the intended use, and can be widely used in shoes, furniture, chairs, etc.

Patent applicant Teijin Cordley Ltd. Agent: Patent Attorney Takashi Shirai Table 1 (continued)

Claims (3)

[Claims] (1) At least 5 when heated to 180°C under no tension
A web consisting mainly of latent spontaneously extensible polyester fibers having a spontaneously extensible property of 30 to 20%
A woven or knitted fabric made of 0 denier long fibers or spun yarn with a weaving density or knitting density of 15 to 80 fibers/inch, respectively, are intertwined and integrated, and the latent spontaneously extensible polyester fiber is A leather-like sheet material based on a fibrous base material that exhibits spontaneous extensibility. (2) The leather-like sheet material according to claim 1, wherein the fibrous base material is treated with an elastic polymer. (3) Claim 1 in which the fibrous base material is subjected to an entanglement treatment mainly from the web side, and is heat-treated at a temperature at which the latent spontaneously extensible polyester fibers exhibit spontaneously extensible properties.
or the leather-like sheet-like material described in 2.