JPH0616959Y2 - Base material for artificial leather - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention relates to a base material for artificial leather for suede or silver surface processing, and an object thereof is to obtain a base material for artificial leather which is very soft and has good processability. And

Conventional technology and its problems Conventionally, as a base material for synthetic leather based on a nonwoven fabric, 2 to
A synthetic fiber web of 3 denier nylon, polyester or the like is needle punched and then synthetic impregnated with a synthetic resin emulsion such as SBR, acryl or vinyl chloride by dry impregnation. On the other hand, a split fiber consisting of a plurality of resin components of 2-3 denier having a texture or feel similar to that of natural leather is spun by carding, needle-punched, and wet-impregnated with urethane resin to obtain the above composite. There is also seen a base material for artificial leather, which is obtained by dissolving and removing a part of the fiber to make it ultrafine. The texture of this artificial leather base material is well-received, but it has to be dissolved and extracted up to about half the volume of the composite fiber, which is very expensive because it requires a removal step with an organic solvent. There is.

In addition, in order to improve the texture after the wet impregnation of the urethane resin, water-soluble resin such as polyvinyl alcohol and carboxymethyl cellulose is pre-impregnated before the wet impregnation, and the supple artificial leather is dissolved and removed after the wet impregnation of the urethane resin. However, there is a problem that the effect is small unless the amount of the water-soluble resin attached is considerably increased.

There is a great difference in texture, feel, performance, price, etc. between these synthetic leathers and artificial leathers, and it is the current situation that no intermediate synthetic / artificial leathers are found.

Means for Solving the Problems The present invention is to provide a base material having a texture feeling intermediate between those of the base material for synthetic leather and the base material for artificial leather at a relatively low cost.

That is, a synthetic fiber web of 0.5 to 3 denier nylon, polyester or the like which can be carded is made into a non-woven fabric sheet having an apparent density of 0.15 to 0.30 g / cm ³ by nidol punching and then polyvinyl alcohol. , Carboxymethyl cellulose, polyacrylic acid, polyacrylamide, polyethylene oxide, aqueous solution resins such as polyethyleneimine, fluorine-based or silicon-based water and oil repellents are applied individually or partially in combination in a dotted manner, and the above water-soluble resin An artificial leather having a very soft texture was obtained by partially coating the fibers with a water and oil repellent and then wet impregnating the urethane resin. Further, the above water-soluble resin can be easily removed only by treating it with a conventional urethane wet impregnation method, and when the composite splittable fiber is used, a special extraction removal step using a solvent is not required. .

Next, the amount of the water-soluble polymer resin / water / oil repellent to be applied to the present invention is preferably 1 to 50%, and particularly 1 to 10% is sufficient when the fluorine-based water / oil repellent is applied alone. And
When the content is more than 10%, the texture is soft, but the feeling of unity between the fiber and the urethane resin is lost, and the falling of the fiber and the deterioration of physical properties such as tensile strength and tear strength are large, which is preferable. Further, the dot-like array pattern of the water-soluble polymer resin / water / oil repellent agent can be freely selected according to the intended use and purpose. That is, in the case of applications such as clothing that requires small shear stress and requires drapability, it is preferable to provide a regular array, and shoes that require dimensional stability and strength.
In the case of use such as a bag, it is preferable to give a random arrangement having no regularity. By the way, the distribution state of adhesion of the water-soluble polymer resin / water / oil repellent agent in the thickness direction of the needle punched nonwoven fabric sheet is related to the bending hardness after urethane wet impregnation, so-called strength of the waist, and changes as desired. It is possible to have

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an artificial leather substrate showing an embodiment of the present invention.

Web 1 made of mixed fiber of polyester fiber 0.8d × 38mm 30%, nylon fiber 0.8d × 51mm 70%, 7
The thickness of the needle punched non-woven fabric sheet subjected to needle punching 2 processing of 50 p / cm ³ was adjusted by a pair of heating rolls heated to 150 ° C., and the basis weight was 250 g / m ² , and the thickness was 1.
It is formed to 2 mm. Next, the needle punched non-woven fabric sheet is prepared by using a paste material having the following composition and a hole diameter of 0.3 mm to 0.7 mm.
The needle punched non-woven fabric sheet is subjected to a printing process through a screen roll having a random arrangement of 280 points / in ^{2 having} a random number and having a drying process,
As the sizing agent 3, a base material 4 for artificial leather having a basis weight of 300 g / m ² to which partially silicified polyvinyl alcohol and a fluorine-based water and oil repellent were attached in a dot shape was constructed.

Partially silicified polynyl alcohol UP-050 100 parts (Unitika Kasei Co., Ltd.) Fluorine-based water and oil repellent M-Guard 100 20 parts (Matsumoto Yushi-Seiyaku Co., Ltd.) Water 520 parts T.I. S = 30% Viscosity 20000 cps Next, FIG. 2 is a sectional view of a base material for artificial leather showing another embodiment of the present invention.

The needle punched non-woven fabric sheet of the above example was subjected to a printing process on the front and back sides through a screen roll which was regularly arranged on a straight line of 0.4 mm hole size and 720 points / in ² using the same sizing agent, followed by a drying step. After that, an artificial leather base material 4 having an upward basis weight of 300 g / m ² to which the sizing agent 3 was regularly attached was obtained.

Incidentally, in order to promote the penetration of the sizing agent into the needle punched nonwoven fabric sheet, by appropriately adding a penetrating agent, the texture and feel of the artificial leather become more remarkable.

For comparison, a needle punched nonwoven fabric sheet was impregnated with polyvinyl alcohol UP-050 and then dried to prepare a comparative example having an upward areal weight of 300 g / m ² .

Wet impregnation treatment was further performed on three of the invention products 1 and 2 and the comparative example to prepare an artificial leather adjusted to have the same adhesion amount (DPU = 100%) as the substrate weight.

The artificial leather made of the artificial leather base material 4 according to the present invention was further sliced into a half thickness to form an artificial leather used for clothing.

The following table shows the results of measuring the physical properties of each of the artificial leather obtained according to the present invention and the comparative example.

Effect of the Invention With the above configuration of the present invention, compared with the conventional artificial leather base material obtained by impregnating a water-soluble polymer resin, a soft artificial leather with a soft texture and waist is created. By combining various combinations of fiber blending, water-soluble resin / water / oil repellent, and dot-like resin application pattern, it is possible to provide artificial leather base material with desired texture / feel at low cost. It is a device that has.

[Brief description of drawings]

FIG. 1 and FIG. 2 are schematic cross-sectional views of a base material for artificial leather showing one embodiment of the present invention. 1 ... Web, 2 ... Needle punch, 3 ... Glue, 4 ... Base material for artificial leather

Claims (2)

[Scope of utility model registration request] 1. The number of needles to be driven is 500 to 1000 p / cm.
² , apparent density 0.15 to 0.30 g / cm ³ , fineness 0.5
Water-soluble resin / fluorine-based or silicone-based water / oil repellent agent may be individually or appropriately mixed on the surface of a denier to 3 denier synthetic fiber needle punched nonwoven fabric sheet to form dots in a regular or irregular pattern. A base material for artificial leather that is adhered. 2. The artificial model according to claim 1, wherein the spotted water-soluble resin / water- and oil-repellent agent is mixed and distributed throughout the thickness of the needle punched nonwoven fabric sheet and in the vicinity of the sheet surface. Base material for leather.