KR960004528B1 - Method of producing waterproof leather - Google Patents

Abstract

The water-proof treating method of a leather comprises (a) retanning the shaved leather with an aldehyde, (b) neutralizing it with NaHCO3 and CH3COONa, and aging and water washing it, (c) fatliquoring the leather fiber with a water-proof silicon oil, a fat amide paraffin and a fluorine resin compound, (d) removing a heavy metal(Ca, Al, Fe) from the leather and the water, (e) sticking the mixed water-proof oil with a sticking agent i.e. ethyl diamine tetraacetate(EDTA), and (f) drying it at 15˜25 deg. C, 35˜45 deg. C and 50˜70 deg. C for 21˜27hrs, 21˜27hrs and 3.5˜6.5hrs, in oder.

Description

Manufacturing method of waterproof leather

1 is a manufacturing process showing the processing process of the conventional leather.

The present invention relates to a waterproofing method of leather paper, by completely waterproofing the surface of the leather to prevent water from seeping and causing stains and distortions in the product to extend the life of the product and improve the reliability.

In general, the use of leather paper, clothing, shoes, bags and the like is a very wide range.

Such leather papers are classified into various forms according to the use applied to the actual products. In general, the process of processing the raw hides to actual products can be described with reference to FIG. 1 as follows.

That is, a pleating process for removing the fat layer in the back layer of raw hides (RAW HIDE) and a soaking process for removing impurities, bacteria, salts, etc. contained in the raw hides and converting them to the hides, Lime process to remove the hair root of the finished leather as sodium hydride (NaHcl ₂ ), emulsified soda (Na ₂ SO ₄ ), to stretch the wrinkles of the leather and to split the leather according to the use, and the lime process In order to give flexibility to the finished leather, the deliming process removes the roots and dirt of the leather after reliming and removes the lime component after the reliming, and the enzyme is applied to the finished fiber after the deliming process. Increasing the tissue to facilitate chemical administration by infiltrating into the skin and removing residual fat from the leather, converting animal fibers into mineral fibers, pickling / chkrometan with + 3-valent ions ning) and the leather after the pickling / chrome tanning process is passed between the rollers to remove moisture under extrusion, and to increase the area of the leather so that the dye is well input in the dyeing process to be described later, and optionally the thickness of the leather backing layer. Phenolic synthetic material and sodium bicarbonate (NaHCO ₃ ) for shaving process to control, retanning process for regrinding the finished leather with chromium (cr), and leather after the retanning process. Neutralizing with acid for 2 hours with CH ₃ CooNa, and neutralizing process to re-adjust acidity, and adding the dye of the required color after dyeing the leather of hard state after the neutralization process Dyeing process, Fat-licluoing to inject general eggplant material to soften the leather paper in the hard state after the dyeing process, and drying the leather after the eggplant process Drying step, the staking or dry milling to physically and smoothly release the leather after the drying process, Toggling process (Toqqling) to increase the yield of the leather finished the mood process and evenly pull, Buffing to select the state of the leather after the tagling process to evenly soften and dogo, and a coating process (Pad Goat) for coloring and coating the desired color on the leather after the peppering process; Inspection for screening and reevaluating the quality of the finished leather after spraying and re-coloring the finished leather and spraying the varnish with a spray or the like, and shipping process for shipping the finished leather. Is done. After such a process, the finished leather is actually applied to the product.

However, the conventional leathers that have completed this process are actually weak in water, which is pointed out as the factor that lowers the reliability most when applied to a product, ie clothes or shoes.

Eventually, this means that expensive leather products have been relatively rained, and even water-dried marks remain as stains even after being dried in the future.

Therefore, the staining factor of leather products is proved that it is not waterproof, and it is a product of expensive leather products. It is pointed out as a factor that shortens the service life and decreases the reliability.

The present invention has been made in view of the above-mentioned conventional technical shortcomings. By completely waterproofing the surface of the leather, water does not penetrate and prevents stains and distortions of the product, thereby extending the life of the product and improving reliability. The purpose is to provide a waterproofing method.

The present invention to achieve the above object, the retanning process for retanning the leather after the shaving process with aldehyde (Aldehyde), and the leather after the retanning process with NaHCO ₃ and the acid (CH ₃ CooNa) for two hours After neutralizing to a certain degree, a neutralizing process of aging, washing with water, and re-adjusting the acidity, softening the leather paper after the neutralizing process, and using a silicone oil or fat amide parafill (water-proof oil) The eggplant process of attaching the fluororesin compound to the fiber (FIBER) and the mixed leather and the heavy metal (ca + 2, Al + 3, Fe + 2) contained in the water after the eggplant process are mixed and mixed A fixing step of fixing the waterproof oil as a fixing agent, a first drying step of drying the leather after the fixing step, a second drying step of drying the leather of the first drying step again, and the second step Finished leather It is achieved by providing the third drying step, a leather treatment comprising a water magazine that drying. Hereinafter, a preferred embodiment of the present invention to achieve the above object will be described in detail.

That is, during the process of the present invention, after the soaking process, lime process, re-liming process, pickling / chrome tanning process, the leather passed through the pickling / chrome tanning process through the roller to remove the water under the extrusion and in the dyeing process to be described later The shaving process of widening the leather so that the dye is added well and selectively controlling the thickness of the back layer of the leather is the same as the conventional process.

In addition, the retanning process of retanning the leather after the shaving process with aldehyde (Aldehyde) is also similar to the retanning process that was retanning with the conventional chrome.

In addition, the neutralization process of neutralizing the leather after the retanning process with sodium bicarbonate (NaHCO ₃ ) and saxic acid (CH ₃ CooNa) for about 2 hours, then aging, washing with water and re-adjusting the acidity is also a phenolic (Phenolic) synthetic material and Neutralizing with NaHCO ₃ purely for about 2 hours is almost the same as the conventional neutralization process, but the important point of the present invention is that the aging time is about 9 hours to 11 hours and then washed with clean water.

However, the dyeing process of adding the dye of the required color after dyeing the leather of the hard state after the neutralization process to the dyeing drum is the same as in the prior art.

In addition, the conventional eggplant process in which a general eggplant material is added to soften the leather paper in the dyed state after finishing the dyeing process is a eggplant process in which silicon oil and fat amide parapim, which is the eggplant material of the present invention, are mixed with a fluororesin compound and then processed. Also similar to the prior art, an important point of the present invention is that the mixing ratio of the fat amide parapim and the fluororesin compound is mixed at a ratio of 2.5 to 3.5: 1.5 to 0.5.

In addition, one of the features of the present invention includes a separate heavy metal removal process for removing heavy metals (Ca + 2, Al + 3, Fe + 2 ...) contained in the mixed leather and water after the branching process Is that.

Preferably, as a fixing agent for removing heavy metal ions in the heavy metal removing process, it is preferable to use aluminum +3 instead of chromium +3 in fixing the E.D.T.A (ETHYL DIAMINE TETRA ACETATE) remover.

More preferably, when the EDTA remover is used, the ratio of leather weight (900 to 1100 g): EDTA (1 to 6 g) is kneaded and the aluminum fixing agent is used after 80 to 100 minutes. 1000 g): It is more preferable to use aluminum fixing agent (30 g). In addition, the dominant feature of the present invention is that the leather after the fixing process is dried in three stages, such as a first drying process, a second drying process, and a third drying process.

Preferably, the first drying step is preferably dried for 21 to 27 hours at a temperature of 15 ℃ to 25 ℃.

The second drying step is preferably dried for 21 to 27 hours at a temperature of 35 ℃ to 45 ℃.

Preferably, the third drying step is continuously dried for about 3 hours 30 minutes to 6 hours 30 minutes at a temperature of 50 ° C to 70 ° C.

After the above process, water was practically poured on the surface of the leather paper of the present invention, and water flowed down uninfiltrated along the surface of the leather paper, and water was poured on the surface of the leather paper. The rolling surface tension phenomenon was found to occur.

The cause is a waterproof oil, such as silicone oil, fluorine resin compound used as a general eggplant material through the retanning process, neutralization process, eggplant process, heavy metal ion removal process and three-stage drying process of the present invention It was found to be attached to the fiber of (FIBER) to inhibit the penetration of hydrophilic material (HOH), and the fixing agent such as Cr + 3, Al + 3 was found to be due to the formation of a complex ion bond.

The present invention as described above is characterized by the fact that the surface of the leather is completely waterproof so that water does not penetrate into the leather so that stains and distortions of the product are prevented and the life of the product is extended to improve reliability.

Claims (10)

Soaking process, lime process, reliming process, pickling / chrome tanning process, shaving process, retanning process, neutralization process, dyeing process, eggplant process, drying process, mood process, tagling process, pepper process, coating process, spray process In the leather paper pore process, which consists of the inspection process and the shipment process, a retanning process of retanning the leather after the shaving process with aldehyde, and NaHCO ₃ and shattering the finished leather after the retanning process After neutralizing with (CH ₃ CooNa) for about 2 hours, a neutralizing process for aging, washing with water, and re-adjusting acidity, and softening the leather paper after the neutralizing process, and a waterproof oil is a fat oil. (Fat Amide Parafftin) is a branching process for attaching the fluorine resin compound to the fiber (FIBER), and the mixed leather and the heavy metals (Ca + 2, Al + 3, Fe +) 2) In the heavy metal removal process of removing and the fixing process of waterproofing base material, the fixing process made of aluminum instead of chromium, the 1st drying process of drying the leather after the said fixing process, and the second drying process of the leather which finished the said 1st drying process again And a third drying step of drying the leather which has finished the second drying step again, and a waterproofing method of the leather paper. The method of claim 1, wherein the aging time during the neutralization process is 9 hours to 11 hours. The method of waterproofing leather paper according to claim 1, wherein the kneading ratio of Fat Amid Paraftim and the fluororesin compound in the branch process is 2.5 to 3.5: 1.5 to 0.5. The method of claim 1, wherein the remover of the heavy metal removal process is a waterproof treatment of E.D.T.A (ETHYL DIAMINE TETRA ACETATE) leather. The method of claim 1, wherein the fixing agent of the fixing step is Al + 3. The method of waterproofing leather paper according to claim 1, wherein the first drying step is performed for 21 to 27 hours at a temperature of 15 ° C to 25 ° C. The method for waterproofing leather paper according to claim 1, wherein the second drying step is performed at a temperature of 35 ° C to 45 ° C for 21 to 27 hours. The method of waterproofing leather paper according to claim 1, wherein the third drying step is performed for 3 hours 30 minutes to 6 hours 30 minutes at a temperature of 50 ° C to 70 ° C. The method for waterproofing leather paper according to claim 4, wherein E.D.T.A of the fixing agent kneads the kneading ratio of leather weight and E.D.T.A at a ratio of 900 to 1100 g: 1 to 6 g and 80 to 100 minutes have elapsed. The waterproofing method of claim 4, wherein the aluminum of the fixing agent is kneaded at a ratio of leather weight and aluminum to a kneading ratio of 900 to 100 g: 10 to 60 g.