KR101877529B1 - Manufacturing method of natural leather for dash board of automobile - Google Patents

Abstract

More particularly, the present invention relates to a process for producing natural leather for automobile dashboards, and more particularly, to a process for producing natural leather for automobile dashboards, in which a non-chrome tanning agent is selectively used in an oil phase, a hydrolyzable vegetable tanning agent is used in a neutralization stage, And the mechanical properties such as tensile strength, tear strength, friction fastness and abrasion resistance meet the physical properties required for the natural leather for automobile dashboard, The present invention relates to a method for manufacturing natural leather for automobile dashboards, which significantly improves the shrinkage ratio of natural leather even when the internal temperature of the automobile changes due to ultraviolet rays or sunshine.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for manufacturing a natural leather for automobile dashboards,

More particularly, the present invention relates to a process for producing natural leather for automobile dashboards, and more particularly, to a process for producing natural leather for automobile dashboards, in which a non-chrome tanning agent is selectively used in an oil phase, a hydrolyzable vegetable tanning agent is used in a neutralization stage, And the mechanical properties such as tensile strength, tear strength, friction fastness and abrasion resistance meet the physical property standards required for natural leather for automobile dashboard, and it is possible to use the waterproofing agent for a long time in the sunlight The present invention relates to a method for manufacturing natural leather for automobile dashboards, which significantly improves the shrinkage ratio of natural leather even when the internal temperature of the automobile changes due to ultraviolet rays or sunshine.

A dashboard is a part of a passenger compartment consisting of a dashboard, a manual control unit, a storage box, and other accessories. It starts from a panel that isolates the interior of the original vehicle from the engine room, did. Dashboards are made of soft materials such as urethane to protect passengers. However, in the automobile industry, materials made of natural leather for dashboard are used in high-end passenger cars, And the movement to utilize high-quality leather material is progressing actively.

It is required to develop leather for dashboard mainly companies producing car seat leather for domestic automobiles, but development is still being done due to lack of information and technology of domestic leather manufacturers. There is no replacement for localization.

In addition, the technological problems that have not been localized include difficulties in manufacturing due to the fact that the physical property standards are very strict than those of the existing leather because the heat resistance shrinkage rate is within 3%, the heat resistance cold resistance shrinkage ratio is within 1.5%, and the heat resistance moisture resistance shrinkage rate is within 6% . This property standard is essential for minimizing problems such as deformations on the exterior due to the shrinkage occurring on the surface of the dashboard due to changes in the internal temperature of the automobile due to ultraviolet rays caused by sunlight or sunlight shining on the interior of the vehicle .

Natural leather used for automobile interior materials has a characteristic of absorbing moisture because its constituent is a protein, and the shrinkage ratio is increased due to the harsh ambient environment of natural leather such as high temperature and humidity, And promotes the aging phenomenon.

Korean Patent Registration No. 10-0788492 discloses a method for producing natural leather for automobile interior materials, which includes a raw hide preparing step, an oil-based step, a remelting step, a branching step and a painting step, And an improvement in heat resistance and flexibility by using a chromium adsorption enhancer in an oil-based process. However, the present invention does not recognize the problem of shrinkage of natural leather due to changes in the internal temperature of automobiles.

The leather manufacturing technology for dashboards for automobiles has only a few of the few companies in the developed countries, and if it is improved, it is highly likely that the company will take the lead in globalization strategy. However, in the case of automobile dashboard leather, it is still difficult to secure technological capability despite high-value-added products, which are essential for luxury cars.

Korean Patent No. 10-0788492

In order to solve the above-mentioned problems, the present invention provides a process for producing a vegetable oil-containing composition, which comprises using a non-chrome tanning agent in an oily step, a vegetable tanning agent in a hydrolysis type in a neutralization step, The mechanical properties such as tensile strength, tear strength, friction fastness and abrasion resistance meet the physical properties required for the natural leather for automobile dashboard, but also the long-time ultraviolet ray caused by sunlight or the inside It was found that the shrinkage ratio of natural leather can be greatly improved even at a temperature change, thereby completing the invention.

Accordingly, an object of the present invention is to provide a method for manufacturing natural leather for automobile dashboards, which is excellent in mechanical properties such as tensile strength, tear strength, friction fastness and abrasion resistance, and significantly improved shrinkage ratio even under extreme conditions.

The present invention relates to a fabric preparation method comprising the steps of: depilating silk skin, dipping, demineralizing and immersing it in an acid solution of pH 2 to 3; Tanning the prepared fabric with at least one non-chrome tanning agent selected from the group consisting of aluminum silicate, glutaraldehyde, or a mixture thereof; Adjusting the thickness of the primary oiled fabric to 0.9-1.1 mm and retanning the non-chrome tanning agent; A neutralization step of raising the pH of the secondary oiled fabric to 5 to 7; A third oil phase step of retanning the neutralized fabric to a hydrolyzable vegetable tanning agent; A dyeing branch step of branching the third oiled fabric; A waterproofing step of waterproofing the dyed fabric with a waterproofing agent which is at least one selected from the group consisting of silicone, phosphoric acid ester and mixtures thereof; And drying the waterproof fabric. The present invention also provides a method of manufacturing natural leather for automobile dashboards.

The natural leather for automobile dashboard of the present invention is characterized in that mechanical properties such as tensile strength, tear strength, friction fastness and abrasion resistance meet the physical property standards required for natural leather for automobile dashboard, and long-term ultraviolet rays or sunshine The shrinkage ratio is greatly improved even when the internal temperature of the automobile is changed.

In addition, a non-chrome tanning agent is used in the first and second oil phase, a hydrolyzable vegetable tanning agent is used in the third oil phase, an excessive amount of the branching agent is used to increase the oil content, It does not contain harmful components and is environmentally friendly, and the shrinkage ratio of natural leather can be greatly improved even under extreme environmental conditions.

Hereinafter, the present invention will be described in more detail with reference to one embodiment.

A method for manufacturing natural leather for automobile dashboards according to the present invention comprises the steps of preparing a fabric including unhairing, demineralizing and immersing the silk leather in an acid solution, a step of tanning with a chrome-based tanning agent composed of aluminum silicate or glutaraldehyde A secondary oil phase in which the primary tanned fabric is regulated to a specific range of thickness and then retanned, a neutralization stage in which the pH of the fabric is increased to facilitate the penetration of chemicals such as dyes and shin, and a hydrolyzable vegetable tanning agent A third oily step for re-tanning, a dyeing step for branching the oily fabric, a waterproof step for preventing moisture using a waterproofing agent for the dyed fabric, and a drying step.

More particularly, the present invention relates to a method for producing natural leather for automobile dashboards, comprising the steps of preparing a fabric containing silver hair, depilating, demineralizing and immersing the leather in an acid solution having a pH of 2 to 3; Tanning the prepared fabric with at least one non-chrome tanning agent selected from the group consisting of aluminum silicate, glutaraldehyde, or a mixture thereof; Adjusting the thickness of the primary oiled fabric to 0.9-1.1 mm and retanning the non-chrome tanning agent; A neutralization step of raising the pH of the secondary oiled fabric to 5 to 7; A third oil phase step of retanning the neutralized fabric to a hydrolyzable vegetable tanning agent; A dyeing branch step of branching the third oiled fabric; A waterproofing step of waterproofing the dyed fabric with a waterproofing agent which is at least one selected from the group consisting of silicone, phosphoric acid ester and mixtures thereof; And a drying step of drying the waterproof fabric.

The method for producing natural leather for automobile dashboard according to the present invention may be selected from one or more kinds selected from the group consisting of aluminum silicate, glutaraldehyde, and mixtures thereof, which are non-chrome tanning agents in the first and second oil phase There are features.

In particular, natural leather for automobile dashboard is not environmentally friendly due to toxic components when it is oiled with chromium sulfate, which is a conventional tanning agent, at the time of manufacturing, and there is a problem that the shrinkage ratio is poor under extreme conditions. In the present invention, a chrome-based tanning agent is selectively used in the first and second oily stages, a hydrolyzable vegetable tanning agent is selected in the third oily stage, and a vegetable tanning agent is used in the dyeing stage So that the fat content in the leather can be 10 parts by weight or more to prevent the heat shrinkage ratio from being lowered.

In addition, the method for manufacturing natural leather for automobile dashboard according to the present invention is characterized in that waterproofing step is performed after dyeing branch step to reduce moisture absorption rate of leather. Through the waterproofing step, the moisture absorption rate in the leather can be minimized even at high ambient humidity.

More specifically, the method for manufacturing natural leather for automobile dashboards of the present invention will be described in detail below with respect to each manufacturing step.

First, the fabrics preparation step according to the present invention includes a step of depilating silver skin, dipping, and immersing it in an acid solution having a pH of 2 to 3.

The hair loss is a process of removing the hair remaining on the nappy, and leathers of the raw hides, the skin layer, the water-soluble proteins in the fibers, the fat and the like are eluted with the strong alkaline lime. Further, the eluted fat is solidified through the saponification reaction due to the alkali compound, and can be removed by using the degreasing agent. In addition to the lime, sodium sulfite, sodium carbonate or sodium hydroxide can be used.

The deliming is a process of removing the strong alkaline chemical used in the depilating process and neutralizing the chemical by adding acid, acid salt, ammonium salt or the like, thereby returning the neppy swelled by the strong alkaline chemical to the original state to be. Preferably, the demineralizer may be a non-zeolite deminer. Examples of the non-enzymatic demineralizer include at least one selected from the group consisting of Lactic acid, Boric acid and Silicate 1,2-Propanediol cyclic carbonate. .

The pickling is a process in which a raw hides are immersed in an acid to obtain a pH suitable for tanning. The acid used for the pickling may be an organic acid such as sulfuric acid, lactic acid, formic acid (formic acid), acetic acid, butyric acid, propionic acid and the like.

The primary and secondary oily steps according to the present invention comprise a primary oily step of tanning the prepared fabric using a chrome-based tanning agent and a secondary oily step of tanning the primary oily fabric to the same non-chrome tanning agent It includes the oil phase step.

In the first oily phase, the unstable collagen protein is bound to the chromium tannin and converted into a stable protein. In the first oily step, aluminum must be uniformly dispersed and distributed on the surface and inside of the fabric. It is often the case that a large amount of aluminum is bonded to the surface and a small amount of aluminum is bonded to the surface.

In order to prevent this, the secondary oily step is to adjust the thickness of the primary oiled fabric to 0.9-1.1 mm, and then aluminum should be uniformly dispersed and distributed on the surface and inside of the fabric. However, And a process of retanning to prevent a small amount of aluminum from bonding. In the secondary oil phase, the process of adjusting the thickness of the primary oiled fabric to 0.9-1.1 mm may be performed. At this time, if the thickness of the primary oiled fabric is less than 0.9 mm, it can not be used as a natural leather for a dashboard, and if it is more than 1.1 mm, the shrinkage ratio may be lowered. It is preferable to adjust the thickness to the above-mentioned range and then retanning with the non-chrome tanning agent. Through this secondary oil phase, aluminum can be bonded to the surface and interior of the fabric in a certain amount.

The non-chrome-based tanning agent may be at least one selected from the group consisting of aluminum silicate, glutaraldehyde, and mixtures thereof. The non-chrome-based tanning agent used in the present invention has no harmful components such as chrome and is environment-friendly, and has an excellent shrinkage resistance. The non-chrome-based tanning agent may be used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the fabric in the primary and secondary oil phase. At this time, if the concentration of the chromium-based tanning agent is less than 1 part by weight, the tanning effect may be insufficient because the content of the tanning agent in the leather is low. If the concentration of the tanning agent is more than 10 parts by weight, none.

The neutralization step according to the present invention is a process of neutralizing the secondary oiled fabric to raise the pH of the secondary oiled fabric to 5 to 7 in order to facilitate penetration of chemicals such as dye and cinnamon into the secondary oiled fabric.

The third oily step according to the present invention is a step for imparting a filling feeling to the leather. The third oily step includes retanning of the neutralized fabric. At this time, the neutralized fabric is immersed in a drum maintained at a temperature of 40 to 50 ° C, and a feeling of filling is imparted to the leather using a hydrolyzable vegetable tanning agent. The vegetable tanning agent can be divided and added, which is a complement to the disadvantage that the infiltration rate of the vegetable tanning agent is slow.

The vegetable tanning agent can be divided into a hydrolysis type and a condensation type, and the hydrolysis type is characterized in that it has less convergence to water than a condensation type. Due to such characteristics, the leather to which the hydrolyzable vegetable tanning agent is applied is strong in abrasion resistance, does not stretch well, and can make the leather tissue dense.

The hydrolyzable vegetable tanning agent may be at least one selected from the group consisting of chestnut extract, oak extract, Dividivi extract, and Valonia extract.

The hydrolyzable vegetable tanning agent may be used in an amount of 2 to 8 parts by weight based on 100 parts by weight of the fabric. If the concentration of the vegetable tanning agent is less than 2 parts by weight, the effect of the vegetable tanning agent can not be sufficiently exhibited. If the concentration of the vegetable tanning agent is more than 8 parts by weight, the shrinkage of the leather excessively increases. It is good. Preferably, the vegetable tanning agent is used in an amount of 4 to 8 parts by weight.

The dyeing step according to the invention is a step for imparting flexibility to the leather. The dyeing step includes the step of adding 15 to 30 parts by weight of the branching agent to the third oil-based fabric based on 100 parts by weight of the fabric. At this time, the third oiled fabric is immersed in a drum maintained at a temperature of 40 to 50 ° C to perform branching work in order to impart flexibility to the leather. In order to satisfy the above requirement, in order to satisfy the above requirement, the fat content in the leather should be 10 parts by weight or more so that the fat content in the leather may be 10 parts by weight or more. It is advisable to put in a weight part.

The branching agent may be a synthetic oil, a vegetable oil, or a mixture thereof. The branching agent may be a mixture of 15 to 30 parts by weight based on 100 parts by weight of the fabric. If the concentration of the branching agent is less than 15 parts by weight, the oil content of the leather may be less than 10 parts by weight and the heat resistance may be deteriorated. If the concentration is more than 30 parts by weight, It is good to do. Preferably, the branching agent is used in an amount of 15 to 20 parts by weight.

The waterproofing step according to the present invention is a step of waterproofing the leather so as to reduce the water absorption rate of the leather so as not to absorb the moisture in the leather as high as it is in a high heat and humidity state in the analysis of resistance to moisture resistance test. The waterproofing step is carried out by immersing the dyed fabric in an aqueous solution of a waterproofing agent which is at least one selected from the group consisting of silicon, phosphoric acid ester or a mixture thereof, and can prevent moisture penetration.

The waterproofing agent may be used in an amount of 2 to 10 parts by weight based on 100 parts by weight of the raw fabric. If the concentration of the waterproofing agent is less than 2 parts by weight, the waterproofing treatment can not be performed properly. If the concentration of the waterproofing agent exceeds 10 parts by weight, there is a problem that the effect on the effect of increasing the amount is insignificant and the leather texture is poor. It is better to choose.

The drying step according to the present invention can dry the waterproof fabric.

In the above-described series of production methods for the production of natural leather for automobile dashboards, it has been found that in the first and second oil phase, neutralization phase, and third oil phase using hydrolyzable vegetable tanning agent , The dyeing step in which the fat content in the leather is at least 10 parts by weight, and the waterproofing step using a waterproofing agent are not particularly limited in the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

Example 1

Natural leather for automobile dashboard was prepared by performing the preparation process as described in Tables 1 and 2 below. The natural leather used in the present invention was used in an amount of 100 g.

fair Content (g) ingredient Time (min) pH Deliming 150 H ₂ O (30 ° C) 0.6 Degreasing agent (D108) 20 ' 3.5 Non-nitrogen demineralizers (Functional esters) 60 ' 8.6 Bating 1.2 Enzymes (fancron) 60 ' Exhaust & Rinse Pickling 100 water 9 Salt 20 ' 7 0.8 Formic acid 1/2 × 20 ' 0.8 Sulfuric acid 1/4 x 10 '+ 90' 2.8 Stirring at night First Tanning 100 water 3 Glutaraldehyde tanning agent 60 ' 0.75 Chinese (1:10) 10 ' 0.75 Chinese (1:10) 10 ' 7 Aluminum silicate tanning agent 120 1.0 Soda ash (1:10) 10 ' 1.2 Chinese (1:10) 180 ' 3.0 Branching agent (synthetic oil) 4.6 Night stirring → Discharge & rinsing → Dehydration → Thickness control Washing 200 H ₂ O 0.5 Formic acid 0.2 Surfactant (D108) 20 ' Exhaust & Rinse Secondary oilseed &
Neutralize 100 H ₂ O 3 Aluminum silicate tanning agent 60 ' 3 Chinese New Carbon NC One Soda ash 0.5 baking soda Overnight 5.4 to 5.5 Exhaust & Rinse

fair Content (g) ingredient Time (min) pH The third oil-
Dyed branch 100 water 2 Chesnut extract 2 BROTAN CPR (phenolic condensate) 20 ' One BROTAN D (naphthalene condensate) 20 ' 2 Chesnut extract 20 ' 2 BROTAN CPR (phenolic condensate) 20 ' 2 BROTAN D (naphthalene condensate) 2 WR (naphthalene condensate) 45 ' 3 BLACK PBR (dye) 1.5 Formic acid 8 BLOSOL SA (synthetic oil) 4 CTS (vegetable oil) 3 BSFR (synthetic oil) 0.7 BLACK PBR (dye) 20 ' 1.5 Formic acid Exhaust & Rinse Waterproof 150 water 4.06 BW (silicone waterproofing agent) 60 ' 2 SW (silicone touch agent) 1.0 Formic acid 20 ' Exhaust & Rinse Capping 150 water 2 Aluminum silicate tanning agent 90 Exhaust & Rinse Setting → Vacuum → Dry chamber → Vibration

Comparative Example 1

In the same manner as in Example 1, natural leather was prepared using chromium sulfate instead of aluminum silicate as a tanning agent in the first and second oil phase.

Comparative Example 2

Except that a condensation type vegetable tanning agent (mimosa) was used in place of the hydrolyzable vegetable tanning agent to prepare natural leather.

Comparative Example 3

The same procedure as in Example 1 was carried out except that 10 parts by weight of a branching agent (synthetic oil) was used to prepare a natural leather.

Comparative Example 4

Natural leather was produced in the same manner as in Example 1 except that the waterproofing step was not performed.

Experimental Example 1

The physical properties of the natural leather for automobile dashboard manufactured in Example 1 and Comparative Example 1 were measured by the following methods, and the results are shown in Table 3 below.

 [Assessment Methods]

(1) Oil content

Diethyl ether was used to measure the oil content of leather, and KS M 6882 method was used with a Soxhlet extractor.

(2) Tensile strength

According to the KS M 6882 test method, the maximum load at the time of cutting by pulling the test specimen at a speed of 100 ± 20 mm / min by universal testing M / C was read and calculated according to the following formula. The test values were taken as the average of the measured values of the two test pieces.

In the above equation, T denotes tensile strength, W denotes a maximum load at the time of cutting, and S denotes a cross-sectional area of the test piece.

(3) Tear strength

According to the KS M 6882 test method, the maximum load at the time of cutting by tearing the specimens at a speed of 100 ± 20 mm / min by universal testing M / C was read and calculated according to the following formula. The test values were taken as the average of the measured values of the two test pieces.

In the above equation, T represents the tear strength, F represents the maximum load at the time of cutting, and t represents the thickness of the test piece.

(4) Friction fastness

According to KS M 6882 test method, the surface of the leather was evaluated in terms of gray scale for the degree of transfer to a cotton cloth (dry, wet) with a load of 900 g and reciprocating 10 times.

(5) Heat shrinkage ratio (High heat)

A leather specimen cut to 300 mm and 300 mm in length was prepared using the "Natural Leather-Laminated Soft Trim" MS322-05 test method, and then tested in a drying chamber at 120 ° C. for 96 hours. Lt; / RTI >

SHH: High heat Shrinkage (%)

L0: Line distance before the test

L: Line distance after the test

(6) Heat shrinkage ratio (Heat / Cold)

Hyundai and Kia Technical Standard "Natural Leather-Laminated Soft Trim" MS322-05 Test method was applied to the test specimens cut to 300mm width and 300mm length.

(7) Heat Shrinkage Rate (Heat / Humidity)

Hyundai and Kia Technical Standard "Natural Leather-Laminated Soft Trim" MS322-05 Test method was applied to the test specimens cut to 300mm width and 300mm length.

(8) Wear resistance

Wheel was selected for the coated film according to the ASTM D 3884 test method and the loss amount was measured by wear test analysis with 1,000 cycles.

Evaluation items unit Example 1 Comparative Example 1 Evaluation standard Assessment Methods thickness mm 1.2 1.2 1.0 to 1.2 Certified Test Report
KS M 6882, KS M ISO 2589 Heat shrinkage ratio % 3 10.6 Within 3% Certified Test Report
MS 322-05 (High heat) Heat resistance cold resistance shrinkage % 0.2 2.5 Within 1.5% Certified Test Report
MS 322-05 (Heat / cold) Heat Resistance Moisture Shrinkage % 5 25.0 Within 6% Certified Test Report
MS 322-05 (Heat / Humidity) Heat discoloration property Grade 4-5 4-5 3.5 or higher Certified Test Report
MS322-05 Water resistance - clear clear clear Certified Test Report
MS322-05 Static load elongation % 15 48 10 to 50 Certified Test Report
MS300-31 Residual Ratio % 7 22 20 or less Certified Test Report
MS300-31 The tensile strength N 152 220 220 Certified Test Report
KS M ISO 3376, KS M 6882 Formaldehyde mg / kg Not detected Not detected Not detected Certified Test Report
KS M ISO 17226 Hydrogen ion concentration - 3.7 3.8 3.5 or higher Certified Test Report
KS M ISO 4045 Fat content % 10.5 9.8 7-12 Certified Test Report
KS M ISO 4048, KS M 6882 Phosphorus strength N 40.5 60.8 25 or more Certified Test Report
KS M ISO 3377, KS M 6882 Light fastness Grade 4 or more 4 or more 3.5 or higher Certified Test Report
KS K ISO 105-B02 Friction fastness Grade 4-5 4-5 3.5 or higher Certified Test Report
KS M ISO 20433 Wear resistance mg.loss 28.0 40.5 Below 80 Certified Test Report
ASTM D 3884

As shown in Table 3, it was confirmed that the natural leather for automobile dashboard manufactured in Example 1 had more suitable properties for automobile interior materials than Comparative Example 1. [

On the other hand, in the case of Comparative Example 1, it was confirmed that the conditions of heat resistance, heat resistance and cold resistance and moisture resistance shrinkage were not satisfied.

Experimental Example 2

The shrinkage test analysis of the natural leather of silk screen prepared in Example 1 and Comparative Examples 1 to 4 was carried out and is shown in Table 4 below. The required shrinkage properties were judged to be suitable for automobile dashboards when the heat shrinkage ratio was within 3%, the heat resistance cold resistance shrinkage ratio was within 1.5%, and the heat resistance moisture resistance shrinkage ratio was within 6%.

division Example 1 Comparative Example One 2 3 4 Contraction ratio
(%) Heat resistance 3.0 10.6 3.5 5.8 3.0 Heat resistance cold resistance 0.2 2.5 1.0 1.3 1.3 Heat Resistance Humidity 5.0 25.0 8.5 10.5 9.4

As shown in Table 4, Comparative Example 1 using the conventional chromium sulfate had a relatively high shrinkage ratio of heat resistance and heat resistance against moisture, and Comparative Example 2 using the condensation type vegetable tanning agent (mimosa) As a result, it was confirmed that Comparative Examples 1 and 2 had unsuitable physical properties as natural leather for automobile dashboards.

In addition, in Comparative Example 3 containing 10 parts by weight of a branched (synthetic) oil, the amount of the oil in the natural leather was so low that the physical properties required for heat resistance and heat shrinkage resistance were not satisfied.

In addition, in Comparative Example 4 in which the waterproofing step was not performed, it was confirmed that the shrinkage ratio of the heat resistant moisture resistance sharply exhibited a high value due to the high convergence property to water.

On the other hand, in the case of Example 1, it was confirmed that all of the physical properties required for an automobile dashboard are satisfied in terms of heat resistance, heat-resistant cold resistance and heat-resistant moisture resistance shrinkage. Also, when the correlation between the shrinkage ratio of the natural leather and the shrinkage ratio of the natural leather is compared, the shrinkage ratio of the heat resistance and the heat resistance shrinkage is low as the hydrophobic content of the natural leather increases, .

Claims (5)

Dipping the silver hide into the acid solution of pH 2 to 3;
Tanning the prepared fabric with at least one non-chrome tanning agent selected from the group consisting of aluminum silicate, glutaraldehyde, or a mixture thereof;
Adjusting the thickness of the primary oiled fabric to 0.9-1.1 mm and retanning the non-chrome tanning agent;
A neutralization step of raising the pH of the secondary oiled fabric to 5 to 7;
A third oil phase step of retanning the neutralized fabric to a hydrolyzable vegetable tanning agent;
A dyeing step comprising mixing 15 to 30 parts by weight of the third olefin based fabric on the basis of 100 parts by weight of the third oleated fabric;
A waterproofing step of waterproofing the dyed fabric with a waterproofing agent which is at least one selected from the group consisting of silicone, phosphoric acid ester and mixtures thereof; And
A drying step of drying the waterproof fabric;
Wherein the method comprises the steps of:
The method according to claim 1,
Wherein the non-chrome-based tannin is mixed with 1 to 10 parts by weight based on 100 parts by weight of the fabric.
The method according to claim 1,
Wherein the hydrolyzable vegetable tanning agent is at least one selected from the group consisting of chestnut extract, oak extract, Dividivi extract and Valonia extract, and the hydrolyzable vegetable tanning agent Is used as a mixture of 2 to 8 parts by weight based on 100 parts by weight of the fabric.
delete The method according to claim 1,
Wherein the waterproofing agent is used in an amount of 2 to 10 parts by weight based on 100 parts by weight of the fabric.