JPS58203177A - Artificial leather for belt or string and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-strength artificial leather with excellent flexibility and bending properties suitable for belts and strings, and a method for producing the same.

Conventionally, one person [leather has been used in a wide variety of ways, just like natural leather. However, it is not necessarily a suitable material for high-strength belts and strings. For belts with relatively wide belts, for example, the
As proposed in the above publication, a belt which was satisfactory to some extent was obtained by stretching at artificial wave 4 and high temperature F.

However, these leather belts have sufficient cutting strength and low strength at low elongation to be used for narrow belts or strings with a narrow width of, for example, 0.51 to 3 (about 11).

In other words, there was a drawback that the deformation was large under so-called low loads, in which the ship would be pushed off the coast by a small force. Therefore, in order to increase the cutting strength and the strength at low elongation, artificial leather was
Attempts were also made to increase the apparent density by applying high pressure) (7), but although it did meet the physical property values for belts, it lacked flexibility and bendability, making it difficult to use for narrow width belts. It was not suitable as a material for cords or laces.Also, even if high-density artificial leather was made by increasing the apparent density during the manufacturing process of artificial leather, it deformed significantly under low loads or had poor flexibility and Due to drawbacks such as insufficient flexibility, artificial leather suitable for narrow belts and strings has not been obtained.

An object of the present invention is to provide artificial leather with excellent visibility and flexibility, which is particularly suitable for narrow belts and strings.

That is, the artificial leather suitable for belts and strings of the present invention is made of ultrafine fibers with a single fineness of o, 6 dr or less or ultra #AM
A fiber sheet in which a visible resin is contained in a fiber-entangled nonwoven fabric composed of jC fibrous fibers, or a sheet having a coating layer of a polymer mainly composed of an elastic polymer on at least one side of the fiber sheet, Its apparent density is 0.5-0.80g/
d, the strength required for 10 buns is 15 to 170 g/d, and the cutting strength of one of them is at least 150 til/d;
It has physical properties of elongation of 50 to 80%.

In the artificial leather suitable for belts and strings of the present invention, the fiber sheet serving as the base material has a single fineness of 0. A fiber sheet containing a visible resin in a fiber-entangled nonwoven fabric made of ultrafine fibers of Bdr or less or bundled fibers of these ultrafine fibers, or at least one surface of the fiber sheet is coated with a polymer mainly composed of an elastic polymer. It has a layer added to it.

The sheet manufacturing method of the present invention comprises combining at least two types of polymers having different chemical or physical properties in a fiber cross-sectional form, at least one type of polymer and the other type of polymer as a dispersion medium component (B). Fibers obtained by spinning to form a dispersed component (A) or fibers obtained by spinning a plurality of element components (C) joined by an element component (D) of another type of polymer. By dissolving the dispersion medium component (B) or element component (D) e in a solvent, the dispersion component (mu) or element component (C) becomes fM fine fiber bundle fibers with a single fineness o or adr or less. (hereinafter referred to as extracted fibers), at least one type of polymer forms a plurality of bonding components with other types of polymers, and by physical and/or chemical actions such as heat and force, the fibers are Fibers that are separated into ultrafine fibers of sdr or more to form bundled fibers (hereinafter referred to as split fibers) or single fibers obtained by spinning or drawing with a single fineness of O, adr or more F
Fine fibers, these extracted fibers, split fibers, or fine fibers are used to make an entangled nonwoven fabric, and in the extracted fibers or split fibers, a solvent is used before or after incorporating the polymer into the entangled nonwoven fabric. The B component or the D component is dissolved or decomposed and removed, and in the case of split fibers, at least about half of the I'll fibers are made into ultra-fine fibers by the process of separating them into each component. The entangled nonwoven fabric is impregnated with a solution, dispersion, or composition of a polymer mainly composed of an elastomeric polymer, and the polymer is coagulated within the entangled nonwoven fabric using a wet or dry method to form ultrafine fibers or ultrafine fibers. The base material is a non-woven fabric in which axial fiber bundle fibers are entangled, and the elastic polymer is entirely contained in a biopolymer.
This base material may be subjected to slicing, puffing, etc., as well as fluffing treatment, if necessary. Further, during the production of the base material, a porous layer coating or a non-porous layer coating of a polymer mainly composed of an elastic polymer may be formed on at least one surface of the fiber sheet. Furthermore, if necessary, the surface of the coating may be subjected to finishing treatments such as coloring, embossing, dyeing, and finishing.5 These fiber sheets are so-called ordinary artificial leather sheets, and these sheets are generally The hanging density is small,
The strength required for 10 strokes is inappropriate for strings and narrow-width belts. Therefore, in the present invention, the total width of this sheet is 0.
．． It is cut into a narrow width of about 5 to 50011cm (t-, 1chi)'' shape, and heated at a temperature below the melting point at which at least one of the materials constituting the sheet '1 becomes soft, preferably at 17
In a hot air oven at 0°C to 200'C, stretch the tapered sheet by 10% to 100% in the longitudinal direction for 5 minutes to 2 minutes.
A method of continuous heat stretching and fixing for 0 minutes is used, and by this method the apparent density is 0.50 to 0.809/d, 10
The strength required for cutting is 15 to 170 kq/cd, and the strength required for cutting is at least 150 to 9/l-
4. A product with satisfactory elongation of 50 to 80% can be obtained. If this performance is not fully satisfied, not only will the strength for strings and narrow belts be insufficient, but the material will also be easily deformed, particularly prone to fraying, making it unsuitable. On the other hand, if the temperature exceeds the melting point and the material becomes excessively rigid, the strength will increase, but the flexibility will decrease, making it impossible to obtain the desired ρ[flexibility] for belts and strings. disadvantages arise.

The fibers constituting the sheet of the present invention are polyester/L/ such as polyethylene terephthalate or its copolymer,
Made of various polyamides, heat-resistant polyolefins of polypropylene, polyacrylonitrile or its copolymers, cellulose rust conductors, recycled natural fibers, oil-insulating polymers of #A fineness U, adrl: l'j, preferably Ultrafine fibers of 0.3 dr ~ 0.0005 dr are bundled and the fineness of the bundled fibers is II + ~ 2
0 dr, or in the case of single fibers, 'JAR degree o, adr below F, preferably -o, s dr ~ mouth, 0
It is a 1 dr fine fiber.

In addition, the flexible resin contained in the woven fabric is one or two resins selected from soft segments such as polynitride diol, polyether diol, polyester ether diol, and polycaprolactone diol. One or two selected from diisocyanate and diol or polyol, diamine or polyamine
A polyurethane elastomer obtained by reacting with a chain extender of #M or higher, or a polynisdel elastomer obtained by reacting a "L soft segment with a compound such as bisphenol A" and a chain extender, polyalkyl acrylate,
It is an elastic polymer made of one or two types of bran selected from synthetic rubber, natural rubber, etc. If necessary, these elastic polymers may contain fillers such as inelastic polymers, animal/vegetable fine powders, inorganic substances, organic substances, etc., colorants, etc.

Further, as the elastic polymer used for the surface coating layer, polyurethane elastomer, polynysdel elastomer, etc.
In addition to these, examples include crosslinked polyurethane elastomers, oxidizable polyvinyl oxides, and plasticized polyamides.

Next, embodiments of the present invention will be described with reference to examples, but the present invention is not limited to these examples. Note that all parts and percentages in the examples are by weight unless otherwise specified.

Example 1 Ultrafine fiber with average fineness of approximately 09 025 dr is IF79
60 originally bundled microfiber bundled fibers form a needle bunch entangled nonwoven fabric, and the entangled nonwoven fabric contains a polyester diol diol diphenylmethane diisocyanate and ethylene glycol. /
Polyurethane nilast marker porous and fiber 100%
A pile material sheet containing 68g to 68g of
This artificial leather has a porous coating layer of polycarbonate yarn polyurethane fstomer on its side.This artificial leather has an apparent degree of 0.429/d and a strength required for 10% elongation of 6.6. kg,/cd, f was moderately 114%.

This artificial leather was cut into a door shape with a total width of 11 mm.
It was stretched by 35% in a hot air heating oven at 180-C and heat treated for 5 minutes. The resulting tape narrowed to about 6.8 sheaths in width and became a string. This item has an apparent density of 0.69/
The strength required for elongation of 1.10% was 79 kg/d, and the elongation at break was 48%, making the artificial leather suitable for use as laces for goop and athletic shoes with excellent bending resistance.

For comparison, all of the tapes listed in L were stretched in the same hot air heating oven at a temperature of 160'C, but could not be sufficiently heat-set.
The elongation was large and the properties as a string could not be obtained. Stretched at 210"C becomes rigid and +st
It did not have flexibility and was not suitable for strings.

Example 2 Non-porous polyurethane is coated on both sides of a base sheet composed of polyurethane efstomer contained in an entangled nonwoven fabric made of 50 ultrafine fibers with an average fineness of about 0.1 dr. Artificial leather gold coated with elastomer, cut into a tape shape with a width of 10 cm, 170°
The material obtained by stretching 70% in a hot air heating furnace of C and heat setting for 3 minutes has an apparent density of 0.71 g/d, a strength required for 10 rapid elongation of 109 kg/cd, and a cutting elongation. The sheet was suitable for a narrow belt with 35 strokes and had excellent bending resistance.

Example 5 The artificial leather of Example 1 was cut into a tape with a full width of 5aIl, stretched for 17 seconds in a hot air heating oven at 190°C, and heat-treated for 10 minutes. 26
．． 5kg/d, cutting elongation 71 响, cutting strength 25
It weighed 5 kg and was suitable as a driving belt for a sewing machine.

Patent applicant: RiRashi Co., Ltd. Agent: Ken Honda, patent attorney

Claims (1)

[Claims] 1. Fiber sheet containing resin in fiber-entangled nonwoven fabric or F! A belt straddle-like article formed from a sheet having a coating layer made entirely of an elastic polymer on at least one side of the fiber sheet, the apparent density of which is 0.50.
~0.80g/c4.Strength required for 10% elongation is 15~
170 匈/d, and the cutting strength is at least 1 sO
Artificial leather for belts and strings with excellent flexibility and elongation of 30 to 80%. 2. The artificial leather according to claim 1, wherein the fiber-entangled non-woven fabric is composed of ultrafine fibers having a single fineness of o and adr or less or bundled fibers of the ultrafine fibers. 6. The artificial leather according to claim 1, wherein the elastic polymer is polyurethane elastomer or polyester elastomer. 4. The sheet metal is composed of a fiber sheet in which a resin is contained in a fiber-entangled nonwoven fabric, or a sheet having at least one surface of the fiber sheet coated with a polymer N'fil- made of elastic polymer #+ as a living body. Under heating conditions below the softening point and melting point of at least one of the materials, the i' is 10 to 1 in the length direction.
00f Stretching and heat setting for belts and strings [Leather manufacturing method.