阅读说明：本技术 一种黄牛皮平纹沙发革的制造工艺 (Manufacturing process of buffalo plain sofa leather ) 是由 周鑫樑 汪周星 周清山 王力武 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种黄牛皮平纹沙发革的制造工艺法,包括以下步骤：选皮步骤、酸洗脱脂步骤、软化步骤、铬复鞣步骤、中和步骤、复鞣染色步骤、水洗加油步骤和后整理步骤；本发明工艺操作简单、易于控制、效率高,制作的平纹沙发革丰满柔软、手感圆润、富有弹性,提高了成革质量和档次。(The invention discloses a manufacturing process of buffalo plain sofa leather, which comprises the following steps: the method comprises the following steps of skin selection, acid washing and degreasing, softening, chrome retanning, neutralizing, retanning and dyeing, water washing and oil adding and after finishing; the process of the invention has simple operation, easy control and high efficiency, and the manufactured plain sofa leather is plump and soft, has mellow hand feeling and high elasticity, and improves the quality and the grade of finished leather.)

1. A manufacturing process of buffalo hide plain sofa leather is characterized in that: the manufacturing process of the buffalo plain sofa leather comprises the following steps:

1) selecting a skin: selecting wet cattle blue skins which are large in width, good in quality, even and solid and consistent in road division, and squeezing, flattening and shaving the wet cattle blue skins;

2) acid washing and degreasing:

rinsing and de-tanning by oxalic acid in pickling degreasing liquid at the temperature of 40 ℃, and slightly removing chromium on the surface of wet blue leather to ensure that the grain surface of a leather blank is fine and the surface is clean; regulating the pH value of the leather blank by formic acid to keep the pH values inside and outside the leather blank consistent; keeping the pH = 3.0-3.5, and rotating for 60 min;

3) softening, namely adding acid softening enzyme to re-soften the treated leather blank at the temperature of 40-50 ℃, rotating for 180 ~ 360min, keeping the pH = 4.0-6.5, and softening for not less than 4 h-6 h;

4) fatty aldehyde pretanning: the leather blanks after the re-softening treatment are checked for softening degree, washed by water and pre-tanned and rotated for 30min by using an aliphatic aldehyde aqueous solution at the temperature of 35-40 ℃;

5) chrome retanning: adding into aqueous solution of fatty aldehydeSynthetic tanning agent, chromium powder and cationic fatting agentRotating at 35-40 deg.C for 90min, adding sodium formate, rotating at 35-40 deg.C for 30min,

adding sodium bicarbonate for three times, adjusting the pH value to 4.0 every 30min, continuously rotating for 180min at the temperature of 35-40 ℃, and then washing with water;

6) neutralization: the neutralization is to adjust the pH value of the leather blank, remove some soluble salt and grease in the leather and play a role in loosening leather fibers;

washing the chrome retanned leather with water, placing the leather in a neutralization solution, rotating for 60min at the temperature of 35-40 ℃, adding a vinyl resin polymer and sulfited fish oil, adjusting the pH value to 5.5-6.0, stopping the drum for overnight, fully washing the leather the next day, and removing soluble salt and grease in the leather;

7) retanning and dyeing:

rotating the leather after being neutralized and washed in a retanning solution for 60min at the temperature of 36-38 ℃, then adding dispersed tannin and dye to rotate for 30min, then adding tara tannin extract VIC, a phenol synthetic tanning agent TAL, dicyandiamide resin Tergatan RSN and a leveling agent ALS 1.0%, rotating for 60min, then adding formic acid 0.5%, and rotating for 30 min;

8) washing and refueling: adding oil to the retanned and dyed leather in the fatliquoring solution, rotating at 60 ℃ for 120min, and adding diluted formic acid twice at an interval of 30min each time;

9) finishing: standing the wet leather blank after washing and adding the oil for 12 hours, squeezing and stretching, and then sequentially carrying out the processes of wet toggling drying, leather grinding, ironing, bottom sizing, hand sizing, packaging and warehousing.

2. The manufacturing process of the buffalo plain sofa leather according to claim 1, which is characterized in that: the pickling degreasing solution in the step 2) comprises the following components in percentage by mass:

200% of water, 1.0% of oxalic acid, a proper amount of formic acid and 2% of degreasing agent Adquil ED;

the acid softening enzyme in the step 3) is acid softening enzyme P-100, and the mass of the acid softening enzyme P-100 accounts for 0.5-1.5% of the mass of the acid pickling degreasing fluid.

3. The manufacturing process of the buffalo plain sofa leather according to claim 1, which is characterized in that: the fatty aldehyde in the step 4) is AK-860 fatty aldehyde, and the mass percent of the fatty aldehyde in the fatty aldehyde aqueous solution is 2.0% of fatty aldehyde.

4. The manufacturing process of the buffalo plain sofa leather according to claim 1, which is characterized in that: in said step 5)Synthetic tanning agentUsing a model of Tanicor Csd powderSynthetic tanning agentThe mass of the fatty aldehyde aqueous solution is 2.5 percent of the mass of the fatty aldehyde aqueous solution; the mass of the chromium powder is 6.0 percent of that of the aliphatic aldehyde aqueous solution; saidCationic fatting agentAdopts the model of Catalix U pasteThe cation fatting agent is added into the mixture,the mass of the aqueous solution is 2.5 percent of that of the aqueous solution of the fatty aldehyde; the mass of the sodium formate is 1.2 percent of that of the fatty aldehyde water solution.

5. The manufacturing process of the buffalo plain sofa leather according to claim 1, which is characterized in that: the neutralization solution in the step 6) comprises the following components in percentage by mass:

150% of water, 1.5% of neutralizer Tanicor AS6, 1.5% of sodium formate and 2.0% of ammonium bicarbonate;

the vinyl resin polymer is a vinyl resin polymer with the model number of tergatan TSP, and the mass of the vinyl resin polymer is 1.2 percent of that of the neutralization solution;

the sulfited fish oil is the sulfited fish oil with the Derminol SPE model, and the mass of the sulfited fish oil is 1.5% of that of the neutralization solution.

6. The manufacturing process of the buffalo plain sofa leather according to claim 1, which is characterized in that: the retanning solution in the step 7) comprises the following components in percentage by mass:

150% of water, 1.5% of tergatan ESN, 1.0% of R83 and 1.5% of Derminol CNR;

the mass of the dye is 1.5 percent of that of the retanning solution;

the mass of the dispersed tannin is 1.2 percent of that of the retanning solution;

the mass of the tara tannin extract VIC is 1.0% of the mass of the retanning solution;

the mass of the TAL is 2.2 percent of that of the retanning solution;

the mass of the dicyandiamide resin tergatan RSN is 2.0 percent of that of the retanning solution;

the mass of the leveling agent ALS is 1.0% of that of the retanning solution;

the mass of the formic acid is 0.5 percent of that of the retanning solution.

7. The manufacturing process of the buffalo plain sofa leather according to claim 1, which is characterized in that: the currying solution in the step 8) comprises the following components in percentage by mass:

200 percent of water, 2.0 percent of lecithin synthetic oil Derminol NLM,

Compound fatting agent: derminol CFS 3.0%, 4.0% fatliquor complex: derminol SU-10 and leveling agent ALS 3.0%;

the mass of the formic acid is 3% of that of the fatliquoring solution.

Technical Field

The invention relates to the technical field of leather manufacturing, in particular to a manufacturing process of buffalo plain sofa leather.

Background

Leather products are highly sought after because of their good physical and chemical properties and appearance, and their comfortable hand feeling. The tanning process is critical in the manufacture of leather and only by tanning can the skin be converted into leather. Among the tanning agents used for tanning at present, the chrome tanning agent which is most widely applied has good tanning performance, excellent comprehensive performance can be endowed to finished leather, the shrinkage temperature of wet chrome-tanned blue leather is high, and the physical and chemical properties are stable. The crust leather grade is improved, the improvement benefit is the inevitable choice for determining the existence of enterprises, the improvement of the crust leather grade is realized by improving the manufacturing process, the manufacturing process is not simple one-step operation, and the product can be formed through a plurality of procedures.

Disclosure of Invention

The invention aims to provide a manufacturing process of buffalo plain sofa leather.

In order to achieve the purpose, the technical solution of the invention is as follows: the manufacturing process of the buffalo plain sofa leather comprises the following steps:

1) selecting a skin: selecting the cattle blue wet skins with large width, good quality, uniformity and consistent road division, and squeezing, flattening and shaving the blue wet skins.

2) Acid washing and degreasing:

rinsing and de-tanning by oxalic acid in pickling degreasing liquid at the temperature of 40 ℃, and slightly removing chromium on the surface of wet blue leather to ensure that the grain surface of a leather blank is fine and the surface is clean; the degreasing agent in the pickling degreasing liquid is used for promoting the wet blue leather to fully rewet, absorbing water, reducing crease marks and removing grease; regulating the pH value of the leather blank by formic acid to keep the pH values inside and outside the leather blank consistent; and (5) keeping the pH = 3.0-3.5, and rotating for 60 min.

3) Softening, namely adding acid softening enzyme to re-soften the leather blank at the temperature of 40-50 ℃, rotating for 180 ~ 360min, keeping the pH = 4.0-6.5, and softening for 4-6 h, so that acid softening enzyme molecules can quickly permeate into the leather skin, loosen collagen fibers, open folds and improve hand feeling.

4) Fatty aldehyde pretanning: the leather blanks after the re-softening treatment are checked for softening degree, washed by water and pre-tanned for 30min by using a fatty aldehyde aqueous solution at the temperature of 35-40 ℃, so that the fullness of the leather is improved, and the penetration and distribution of chromium powder are accelerated and improved.

5) Chrome retanning: adding into aqueous solution of fatty aldehydeSynthetic tanning agent, chromium powder and cationic fatting agentRotating at 35-40 deg.C for 90min, adding sodium formate, rotating at 35-40 deg.C for 30min,

adding sodium bicarbonate for three times, adjusting the pH value to 4.0 every 30min, continuously rotating for 180min at the temperature of 35-40 ℃, and then washing with water; the synthetic tanning agent and the chromium powder are matched for use, the synthetic tanning agent in the retanning solution can enhance the tensile strength and the tearing strength of seams of leather, the chromium powder can be dispersed, the chromium retanning is uniform and deep, and the cation fatliquor in the retanning solution is subjected to pre-fatliquoring.

6) Neutralization: the neutralization is to adjust the pH of the leather blank, remove some soluble salt and grease in the leather and play a role in loosening the leather fibers. Washing the chrome retanned leather with water, placing the leather in a neutralization solution, rotating for 60min at the temperature of 35-40 ℃, adding a vinyl resin polymer and sulfited fish oil, adjusting the pH value to 5.5-6.0, stopping the drum overnight, fully washing the leather the next day, and removing soluble salt and grease in the leather.

7) Retanning dyeing

The leather after being neutralized and washed rotates for 60min at the temperature of 36-38 ℃ in a retanning solution, then dispersed tannin and dye are added to rotate for 30min, tara tannin extract VIC, phenolic synthetic tanning agent TAL, dicyandiamide resin Tergatan RSN and leveling agent ALS are added to rotate for 60min, then formic acid 0.5 percent is added to rotate for 30min,

8) washing and refueling: the retanning dyed leather is added with oil in the fatliquoring solution, and after rotating for 120min at the temperature of 60 ℃, the diluted formic acid is added in two times at an interval of 30min each time.

9) Finishing:

standing the wet leather blank after washing and adding the oil for 12 hours, squeezing and stretching, and then sequentially carrying out the processes of wet toggling drying, leather grinding, ironing, bottom sizing, hand sizing, packaging and warehousing.

The process of the invention has simple operation, easy control and high efficiency, and the manufactured plain sofa leather is plump and soft, has mellow hand feeling and high elasticity, and improves the quality and the grade of finished leather.

Detailed Description

The manufacturing process of the buffalo plain sofa leather comprises the following steps:

1) selecting a skin: selecting the cattle blue wet skins with large width, good quality, uniformity and consistent road division, and squeezing, flattening and shaving the blue wet skins.

2) Acid washing and degreasing:

rinsing and de-tanning by oxalic acid in pickling degreasing liquid at the temperature of 40 ℃, and slightly removing chromium on the surface of wet blue leather to ensure that the grain surface of a leather blank is fine and the surface is clean; regulating the pH value of the leather blank by formic acid to keep the pH values inside and outside the leather blank consistent; and (5) keeping the pH = 3.0-3.5, and rotating for 60 min.

Further, the pickling degreasing fluid comprises the following components in percentage by mass:

200 percent of water, 1.0 percent of oxalic acid, a proper amount of formic acid, and 2 percent of degreasing agent Adoil ED,

3) softening, namely adding acid softening enzyme to re-soften the treated leather blank at the temperature of 40-50 ℃, rotating for 180 ~ 360min, keeping the pH = 4.0-6.5, and softening for not less than 4 h-6 h.

Furthermore, the acid softening enzyme adopts acid softening enzyme P-100, and the mass of the acid softening enzyme P-100 accounts for 0.5-1.5% of the mass of the pickling degreasing fluid.

4) Fatty aldehyde pretanning: the leather blanks after the re-softening treatment are checked for softening degree, washed by water and pre-tanned and rotated for 30min by using an aliphatic aldehyde aqueous solution at the temperature of 35-40 ℃.

Further, the fatty aldehyde is AK-860 fatty aldehyde, and the mass percent of the fatty aldehyde in the fatty aldehyde aqueous solution is 2.0% of fatty aldehyde.

5) Chrome retanning: adding into aqueous solution of fatty aldehydeSynthetic tanning agent, chromium powder and cationic fatting agent35℃～40℃Rotating for 90min under the temperature condition, adding sodium formate, rotating for 30min under the temperature condition of 35-40 ℃,

adding sodium bicarbonate for three times, adjusting the pH value to 4.0 every 30min, continuously rotating for 180min at the temperature of 35-40 ℃, and then washing with water;

further, the saidSynthetic tanning agentUsing a model of Tanicor Csd powderSynthetic tanning agentThe mass of the fatty aldehyde aqueous solution is 2.5 percent of the mass of the fatty aldehyde aqueous solution; the mass of the chromium powder is 6.0 percent of that of the aliphatic aldehyde aqueous solution; saidCation addition Fat liquorAdopts the model of Catalix U pasteThe cation fatting agent is added into the mixture,the mass of the aqueous solution is 2.5 percent of that of the aqueous solution of the fatty aldehyde; the mass of the sodium formate is 1.2 percent of that of the fatty aldehyde water solution.

6) Neutralization: washing the chrome retanned leather with water, placing the leather in a neutralization solution, rotating for 60min at the temperature of 35-40 ℃, adding a vinyl resin polymer and sulfited fish oil, adjusting the pH value to 5.5-6.0, stopping the drum overnight, fully washing the leather the next day, and removing soluble salt and grease in the leather.

Further, the neutralization solution comprises the following components in percentage by mass:

150% of water, 1.5% of neutralizer Tanicor AS6, 1.5% of sodium formate and 2.0% of ammonium bicarbonate;

the vinyl resin polymer is a vinyl resin polymer with the model number of tergatan TSP, and the mass of the vinyl resin polymer is 1.2 percent of that of the neutralization solution;

the sulfited fish oil is the sulfited fish oil with the Derminol SPE model, and the mass of the sulfited fish oil is 1.5% of that of the neutralization solution.

7) Retanning and dyeing:

the leather after being neutralized and washed rotates for 60min at the temperature of 36-38 ℃ in a retanning solution, then dispersed tannin and dye are added to rotate for 30min, tara tannin extract VIC, phenolic synthetic tanning agent TAL, dicyandiamide resin Tergatan RSN and leveling agent ALS are added to rotate for 60min, then formic acid 0.5 percent is added to rotate for 30min,

further, the retanning solution comprises the following components in percentage by mass:

150% of water, 1.5% of the soft resinous polymer Tergatan ESN, 1.0% of the soft resinous polymer R83 and

1.5% of oiling agent Derminol CNR;

the mass of the dye is 1.5 percent of that of the retanning solution;

the mass of the dispersed tannin is 1.2 percent of that of the retanning solution;

the mass of the tara tannin extract VIC is 1.0% of the mass of the retanning solution;

the mass of the TAL is 2.2 percent of that of the retanning solution;

the mass of the dicyandiamide resin tergatan RSN is 2.0 percent of that of the retanning solution;

the mass of the leveling agent ALS is 1.0% of that of the retanning solution;

the mass of the formic acid is 0.5 percent of that of the retanning solution;

8) washing and refueling: the retanning dyed leather is added with oil in the fatliquoring solution, and after rotating for 120min at the temperature of 60 ℃, the diluted formic acid is added in two times at an interval of 30min each time.

The currying solution comprises the following components in percentage by mass:

200 percent of water, 2.0 percent of lecithin synthetic oil Derminol NLM,

Compound fatting agent: derminol CFS 3.0%, 4.0% fatliquor complex: derminol SU-10 and leveling agent ALS 3.0%;

the mass of the formic acid is 3% of that of the fatliquoring solution.

9) Finishing: standing the wet leather blank after washing and adding the oil for 12 hours, squeezing and stretching, and then sequentially carrying out the processes of wet toggling drying, leather grinding, ironing, bottom sizing, hand sizing, packaging and warehousing.

The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.