KR20040048230A - Manufacturing method for environment protective artificial leather - Google Patents

Abstract

PURPOSE: A manufacturing method of artificial leather being environmentally friendly is characterized by using environmentally friendly water dispersion polyurethane resin, reducing a production cost and increasing productivity. CONSTITUTION: Artificial leather is obtained by the steps of: dipping a base material(2) into a water dispersion polyurethane resin(3) to get about 50% of moisture content; passing the material through a dryer(5); smoothing a coated layer with a steam drum(6) to manufacture a dipped fabric(2a); coating an upper side of the dipped fabric(2a) with the water dispersion polyurethane resin mixed with a thickener on 0.5-1.5mm of thickness with a coater(7) to manufacture a coated fabric(2b); coagulating the coated fabric(2b) through a steam chamber(8) having 70-200deg.C; drying the coagulated fabric(2b) with a first dryer(18); smoothing a coated layer with a steam drum(17); and then drying the fabric with a second dryer(18a).

Description

Manufacturing method for environment protective artificial leather

The present invention relates to an environmentally friendly artificial leather manufacturing method capable of manufacturing synthetic leather (synthetic leather) widely used in shoes, bags, miscellaneous goods, sports goods, etc. More specifically, the substrate (non-woven fabric, woven fabric, etc.) 1 To impregnate and dry the secondary water-dispersed polyurethane resin to make impregnated cloth, and then, to provide a method of manufacturing artificial leather by coating the water-dispersed polyurethane resin with high viscosity to make a coated cloth and coagulating with steam. In particular, it is to provide a new artificial leather manufacturing method that can be manufactured in an environment-friendly and cheap.

In general, in order to manufacture artificial leather, artificial leather is manufactured using oil-based resins composed of 70% DMF and 30% polymer in nonwoven fabrics.

Among the oil-based resins used in the composition of the existing artificial leather, DMF is very toxic and environmentally invasive composition has been said that the use of such DMF should be actively refrained.

In addition, the existing artificial leather manufacturing apparatus is not only expensive, but also has a high space occupancy rate of the apparatus and requires a large number of workers, thereby limiting the manufacturing cost.

In order to solve the above problems, the inventors of the present invention have completed the development of 'artificial leather manufacturing method' which can manufacture artificial leather at low cost using environmentally-friendly water-dispersed polyurethane resin, and applied for a prior patent application (application number: 10-2001-0040535)

Not satisfied with the above patent application, the method has been improved and the method defects that hinder the mass production that can produce artificial leather have been continuously explored and developed.

Accordingly, the present invention is to provide an environmentally friendly artificial leather manufacturing method that can more effectively manufacture artificial leather using a substrate such as a water-dispersible polyurethane resin, nonwoven fabric, woven fabric,

The present invention particularly impregnated and coated the water-dispersed polyurethane resin on the nonwoven fabric first, and then smoothing the coating surface, and after coating the water-dispersed polyurethane resin with high viscosity secondly after steam solidification and drying and smoothing after drying and smoothing operation The present invention has been completed with the technical problem of the invention in providing a method for manufacturing artificial leather completed by the method.

1 is a schematic view showing an embodiment of the artificial leather manufacturing method provided by the present invention

In block diagram

Figure 2 of the steam chamber for steam solidification process of the artificial leather manufacturing method of the present invention

Section shown composition

3 is a steam chamber for steam solidification process of the artificial leather manufacturing method of the present invention

Cross-sectional view showing composition

■ Explanation of symbols used in main part of drawing ■

1: artificial leather manufacturing apparatus 2: base material

2a: impregnated cloth 2b: coated cloth

3: water dispersion polyurethane resin 4: impregnation tank

5: dryer 6: steam drum

7: coater 8: steam chamber

9: steam barrier plate 9a: opening

10: steam chamber 11: steam spray chamber

12: steam jet 12a: steam jet

13: steam tube 14: hot air fan

14a: hot air injection pipe 15: discharge steam absorption pipe

16: Gutter for external condensate 17: Steam drum

18: primary dryer 18a: secondary dryer

19: artificial leather 20: odor

The environmentally friendly artificial leather manufacturing method provided by the present invention will be described in detail with reference to FIGS. 1 to 3 as follows.

That is, the impregnating tank (4) storing the water-dispersed polyurethane resin (3), which is primarily composed of a nonwoven or woven base material (2) 70% of water and 30% of polyurethane resin, in order to manufacture environmentally friendly artificial leather. After being impregnated in, the dryer 5 is passed through the impregnating tank 4 to dry the substrate 2 impregnated with the water-dispersible polyurethane resin 3, that is, the impregnation cloth 2a.

When passing through the dryer 5, the preferred drying temperature is 80 ~ 250 ℃. After passing through the dryer (5), the water content of the water-dispersible polyurethane resin (3) on the impregnated fabric (2a) is adjusted to about 50% of the weight of the substrate (2).

In order to smooth the coated surface of the water-dispersed polyurethane resin (3) impregnated in the impregnated cloth (2a), the moisture content of which is supplied via a steam drum (6) supplied with steam so as to be heated to a temperature of 80 to 250 ° C. .

The water-dispersed polyurethane resin (3) having a high viscosity of about 7,000 centipoise is mixed on the upper surface of the impregnated cloth (2a) with the smoothed coating surface, and the coating is coated with a coater (coater) 7 to a thickness of about 0.5 to 1.5 mm. To process a so-called 'coating cloth' 2b.

The second water-dispersed polyurethane resin (3) to be coated is to use a mixture of water and solid content of about 70:30,

The solid content is 100 parts by weight of polyurethane resin, 10 parts by weight of toner to obtain a specific color, 5 parts by weight of thickener to obtain a desired viscosity, and 5 parts by weight of organic or inorganic salts as other additives. Will be used.

In order to steam-solidify the water-dispersed polyurethane resin 3 coated on the coating cloth 2b, the coating cloth 2b is supplied onto the steam chamber 8 operating within a temperature range of 70 to 200 ° C. The water-dispersed polyurethane resin (3) coated with tea is solidified by steam coagulation.

The steam content on the steam chamber 8 is supersaturated, and is sprayed from the lower part of the steam chamber 8 to the upper part at a pressure of about 0.5 kg / cm ² so that steam does not directly contact the coating cloth 2b. It is important.

To this end, the steam chamber 8 used in the artificial leather manufacturing method of the present invention, as shown in Figures 2 and 3, by installing a steam blocking plate 9 made of stainless steel or the like inside the steam chamber 8, the upper and lower steam chambers. 10 and the steam injection chamber 11 to be formed separately, but the opening (9a) as shown in the cross-sectional view of Figure 3 to both sides of the steam blocking plate (9) is sprayed from several steam injectors (12a) The steam is to be injected into the steam chamber 10 through a plurality of steam injection port 12 so that there is no direct steam contact in the lower portion of the silver layer.

In addition, a plurality of steam pipes 13 for internal condensation water removal may be piped at predetermined intervals before and after the inside of the steam chamber 10, and steam is condensed on the upper surface of the steam chamber 10 to the upper surface of the coating cloth 2b. Do not fall.

The condensate removal steam tube 13 may be replaced with a heating means containing a heater that is electrically heated as necessary.

In addition, a hot air fan 14 is installed on the upper portion of the steam chamber 10 to discharge the steam discharged to the inlet side through which the coating cloth 2b is introduced, and to supply the steam to the steam spray chamber 11 to be circulated and supplied to the steam spray chamber 11. ) Is connected to the hot air blower 14, and is supplied from the hot air blower 14 to the steam spraying chamber 11 through the hot air injection pipe (14a).

On the other hand, the external condensate receiving gutter (gutter) 16 is installed so that the external condensate does not fall to the inlet portion of the steam chamber 8 into which the coating cloth 2b flows.

The gutter 16 may be installed only at the inlet side, that is, the outlet of the steam chamber 8 is discharged after the coating cloth 2b is steam solidified, so even if the external condensate falls on the top surface of the coating cloth 2b, It doesn't affect anything at all.

When the temperature inside the steam chamber 8 is high, 70% of the water acting as the urethane dispersion medium of the water-dispersed polyurethane resin 3 coated on the coating cloth 2b is boiled and the surface film is damaged, so the steam chamber 8 The temperature control of) is very important. It is preferable to operate the temperature of the steam chamber 8 about 110-130 degreeC.

The steam-coated coating cloth (2b) through the steam chamber (8) is passed through the primary dryer 18 for drying the silver layer surface steam drum warmed to a temperature of 80 ~ 250 ℃ for smoothness of the silver layer surface (17) is passed through the secondary dryer (18a) for the final drying of the artificial leather (19) is to be wound up in a winder (20) consisting of a winding roller capable of winding it.

Hereinafter, a preferred embodiment of manufacturing artificial leather using the artificial leather manufacturing method of the present invention will be described.

(Example 1)

A nonwoven fabric wound in a roll state was supplied as a base material 2 onto the impregnation tank 4 and impregnated with the water-dispersed polyurethane resin 3 introduced into the impregnation tank 4.

After drying the substrate (2) impregnated with the water-dispersible polyurethane resin (3) via a dryer (5) having a temperature of about 130 ℃, passed through a steam drum (6) heated to a temperature of about 120 ℃ The coated surface of the water-dispersed polyurethane resin 3 coated on the substrate 2 was smoothed.

The impregnated fabric 2a impregnated with the water-dispersed polyurethane resin 3 having passed through the steam drum 6 had a smooth surface and was integrated with the substrate 2.

A thickener is mixed on the upper surface of the impregnated fabric 2a to coat a water-dispersed polyurethane resin 3 having a high viscosity, such as honey, on the upper surface of the impregnated fabric 2a while passing through the coater 7. While coating the coating cloth (2b) coated with the water dispersion polyurethane resin (3) was continuously introduced into the upper steam chamber (10) of the steam blocking plate (9) of the steam chamber (8).

The internal temperature of the steam chamber 10 of the steam chamber 8 was set to maintain 110 to 130 ° C., and the water-dispersed polyurethane resin coated on the upper surface of the coating cloth 2b via the steam chamber 10 ( 3) The surface coating was completely solidified.

In addition, when the coating cloth 2b is passed through the steam chamber 8, the steam generated in the steam spray chamber 11 under the steam chamber 8 is not directly raised by the steam blocking plate 9, but is laterally raised. It rose through the opening 9a of and made it possible to steam-solidify the water-dispersed polyurethane resin 3 on the coating cloth 2b.

The coating cloth 2b via the steam chamber 8 was passed through the primary dryer 18 to perform the silver layer surface drying, and to pass the steam drum 17 heated at 120 ° C. to smooth the silver layer surface. After passing through the secondary dryer (18a) was finished the manufacture of artificial leather (19) through a process of winding the finished artificial leather 19 after the final drying on the odor blowing machine (20).

The artificial leather 19 produced by Example 1 had a leather texture without a gloss as it was, and the surface texture was very soft, and the excellent artificial leather embodying the surface texture of the artificial leather manufactured by the existing method as it is. Could get

In addition, the manufacturing time was also confirmed in a short time compared to the conventional artificial leather manufacturing process can be significantly contributed to the mass production of the product.

As described in detail above, the environmentally friendly artificial leather manufacturing method provided by the present invention is first impregnated with an eco-friendly water-dispersed polyurethane resin (3) on a base (2) made of nonwoven fabric or woven fabric, and then steamed. After preparing the impregnated cloth (2a) smoothing the coating surface in the steam drum (6) heated by the second, and then coated with a water-dispersed polyurethane resin (3) to which the thickener was impregnated on the impregnated cloth (2b) After making the coating cloth (2b) and steam-coagulated on the steam chamber (8), the first drying to dry the silver layer surface, passed through the steam drum (17) heated by steam and smoothed, and then the second drying is artificial leather As (19) can be manufactured,

The present invention can be used in the manufacture of environmentally friendly artificial leather, in particular, compared to the conventional organic solvent-type artificial leather manufacturing apparatus, can provide a cheap artificial leather by reducing the installation cost and manpower, etc. Artificial leather can be mass-produced to maximize productivity.

Claims (3)

In the manufacture of artificial leather using a water-dispersed polyurethane resin; First impregnating the water-dispersed polyurethane resin on the substrate 2 with a moisture content of about 50%, passing the dryer 5, and smoothing the coated surface with a steam drum 6 to form the impregnated cloth 2a; , Coating the water-dispersed polyurethane resin mixed with a thickener on the upper surface of the impregnated cloth (2a) with a coater (7) to a thickness of about 0.5 to 1.5 mm, and forming a coating cloth (2b); Steam solidifying the coating cloth (2b) via a steam chamber (8) which is a temperature condition of 70 ~ 200 ℃, The steam-coated coating cloth (2b) is passed through the primary dryer (18) for the first time and then dried via the steam drum (17) for the smoothing of the coated surface, and then secondary drying through the secondary dryer (18a). Environmentally friendly artificial leather manufacturing method characterized in that to manufacture artificial leather. The method of claim 1; The steam chamber (8) is passed through the coating cloth (2b) and steam rises through both openings (9a) of the steam blocking plate (9) so that steam does not directly contact the coating cloth (2b) during steam solidification. 10) Environmentally friendly artificial leather manufacturing method, characterized in that the water-dispersed polyurethane resin coated on the coating cloth (2b) is supplied to the inside. The method of claim 1; The substrate (2) is an environmentally friendly artificial leather manufacturing method, characterized in that the use of non-woven or woven fabric selectively.