CN110923374B - Leather and preparation method thereof - Google Patents
Leather and preparation method thereof Download PDFInfo
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- CN110923374B CN110923374B CN201911094302.9A CN201911094302A CN110923374B CN 110923374 B CN110923374 B CN 110923374B CN 201911094302 A CN201911094302 A CN 201911094302A CN 110923374 B CN110923374 B CN 110923374B
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C11/00—Surface finishing of leather
- C14C11/003—Surface finishing of leather using macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
- C14B1/00—Manufacture of leather; Machines or devices therefor
- C14B1/40—Softening or making skins or leather supple, e.g. by staking, boarding, or crippling machines, by dry mills
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
- C14B1/00—Manufacture of leather; Machines or devices therefor
- C14B1/58—Drying
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
- C14B17/00—Details of apparatus or machines for manufacturing or treating skins, hides, leather, or furs
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C15/00—Apparatus for chemical treatment or washing of hides, skins, or leather
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The invention discloses leather and a preparation method thereof, which at least comprises the following steps: providing remoistened crust leather, squeezing and stretching the crust leather, carrying out toggling and drying treatment, and brushing crack surface slurry, wherein the preparation method of the crack surface slurry comprises the following steps: uniformly mixing 100-300 parts of anionic polyacrylic resin polymer, 10-50 parts of penetrating agent and 50-250 parts of water, drying in an oven, and vibrating and softening to obtain uniform and natural crack effect; this application adopts to use anionic polyacrylic resin as the main, make up water and a small amount of penetrant simultaneously and prepare the thick liquids, brush on crust leather grain face, then carry out quick drying in the oven, under the effect of penetrant, anionic polyacrylic resin can permeate the grain surface layer, fill the grain surface layer, make the grain surface layer sclerosis embrittlement after quick drying, and the dry film of one deck stiff has been gone up on the grain surface, then the vibration staking out, mechanical action can make stiff dry film and grain surface layer cracked, thereby make crust leather obtain natural even crack.
Description
Technical Field
The invention relates to the technical field of leather-making chemistry and leather-making engineering, in particular to a leather crack treatment method, leather comprising the crack treatment method and a preparation method thereof.
Background
Along with the increasing improvement of the living standard of people, people pay more and more attention to the aesthetic degree of leather, the leather is derived from animal fur such as cattle, sheep and the like, the leather is inevitably provided with defects such as branding, hurdle, stabbing and scratching, in order to cover or eliminate the defects, a thicker coating is coated on the grain surface, or the grain surface is ground to be made into finishing leather, the natural grains and traces existing in the leather can be lost, the unique characteristics of the leather as a natural material are lost, the current domestic and foreign natural leather market is in a low-lying state, the industry development encounters a bottleneck, the natural leather product is single, the homogenization phenomenon is heavier and heavier, and the ever-increasing personalized and fashionable requirements of people cannot be met. Therefore, the method overcomes the grain surface defect of the leather, retains the natural grains, develops a new leather product with special effect, and is the direction of sustainable development of the leather industry.
Disclosure of Invention
The embodiment of the application provides a leather crack treatment method, which comprises the following steps:
(a) providing a crust leather after being rewetted;
(b) carrying out water squeezing, stretching and toggling drying treatment on the crust leather;
(c) brushing crack surface slurry, wherein the preparation method of the crack surface slurry comprises the following steps: uniformly mixing 300 parts of anionic polyacrylic resin polymer 100, 10-50 parts of penetrating agent and 50-250 parts of water;
(d) drying in an oven;
(e) and vibrating and softening to obtain uniform and natural crack effect.
Furthermore, the temperature of the toggling drying is 40-60 ℃, the time is 6-12h, the toggling distance is 5-10cm, and the water content of the crust leather after toggling is 10-15%.
Further, the penetrating agent is selected from any one of an anionic surfactant and a nonionic surfactant.
Further, the drying temperature of the oven is 50-70 ℃, the drying time is 3-6h, and the water content of the baked crust leather is 6-10%.
Further, the oscillation softening strength is 3-6 grades and the frequency is 1-4.
The crack treatment method can be used for treating the grain surface of the leather.
The preparation method of the leather comprises the working procedures of wringing, shaving, rewetting, retanning, neutralizing, filling and dyeing, greasing and dry finishing, and is characterized by further comprising a crack treatment working procedure, wherein the crack treatment working procedure is carried out in the rewetting working procedure or after the retanning working procedure.
Further, the specific operation steps of the rewetting process are as follows: calculated by taking the mass of the wet blue leather as a reference, adding water at 35-45 ℃ of 150-250%, ammonia-free deliming agent at 0.5-1.5%, nonionic surfactant at 0.1-0.5% and oxalic acid at 0.5-2.5% into a rotary drum, and rotating for 60-120 min; draining half of the bath liquid, adding 2-5% of dispersed tannin and 1-3% of sulfone synthetic tanning agent, rotating for 60-120min, draining, and washing with water.
Further, the specific operation steps of the retanning process are as follows: calculated by taking the mass of wet blue leather as a reference, adding 50-150% of water with the temperature of 25-35 ℃ and 0.5-2.5% of fatty aldehyde tanning agent into a rotary drum, and rotating for 30-60 min; adding 1-4% chrome tanning agent and 1-4% chrome-containing tannin, and rotating for 60-90 min; adding 0.5-1.5% sodium formate, and rotating for 30-60 min; adding 0.5-1.5% sodium bicarbonate, rotating for 30-60min, adjusting bath pH to 3.8-4.0, adding 1-3% amphoteric synthetic tanning agent, rotating for 30-60min, draining, and washing with water.
The invention also provides leather which can be obtained according to the method disclosed by the invention.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. this application adopts to use anionic polyacrylic resin as the main, simultaneously make up water and a small amount of penetrant and prepare the thick liquids, brush on crust leather grain face, then carry out quick drying in the oven, under the effect of penetrant, anionic polyacrylic resin can permeate the grain face layer, fill the grain face layer, make it compacter, make the grain face layer sclerosis embrittling behind the quick drying, and the dry film of one deck stiff has been gone up on the grain face, then vibrate and draw soft, mechanical action can make stiff dry film and grain face layer cracked, thereby make crust leather obtain the crack of natural even crack.
2. In the crack treatment operation, the crust leather is firstly squeezed and stretched and is subjected to toggling drying, the grain surface of the crust leather is flattened by utilizing the mechanical action, and the grain surface fibers are further loosened, so that the subsequent crack slurry can permeate to the grain surface layer, a continuous and uniform film is formed, and the uniform and natural crack effect of the whole grain surface can be obtained; in addition, the leather obtaining area can be increased by squeezing water and stretching and toggling and the leather obtaining rate is improved.
3. The leather crack treatment method is simple and flexible to operate, can be used for carrying out crack treatment operation after rewetting or retanning according to production requirements when leather grain surfaces are produced, and has strong practicability and good industrial application prospects.
4. The leather prepared by adopting the crack treatment operation after moisture regaining has the following advantages: in the process of rewetting, firstly adding an ammonia-free deliming agent and oxalic acid for treatment, wherein the ammonia-free deliming agent can remove calcium ions remained in crust leather, and the oxalic acid can wash away chromium ions which are not uniformly combined on the grain surface of the crust leather, so that the permeation of subsequent materials is facilitated; then adding the dispersed tannin and the sulfone synthetic tanning agent for treatment, wherein the tannin and the sulfone synthetic tanning agent can be uniformly dispersed in the grain surface layer, so that on one hand, the retanning effect is achieved, the crosslinking of fibers in crust leather is enhanced, and on the other hand, the penetration and uniform dispersion of subsequent crack slurry to the grain surface layer can be promoted; and the oxalic acid can reduce the pH value of the crust leather, so that the cationic property of the crust leather is enhanced, and the anionic acrylic resin in the subsequent splitting slurry is favorably combined and fixed in the grain surface layer and on the surface. Finally, the crack treatment operation is carried out after rewetting, and a uniform and natural grain surface crack effect is obtained.
5. The leather prepared by performing crack treatment operation after the retanning procedure has the following advantages: in the retanning process, the fatty aldehyde tanning agent and the amphoteric synthetic tanning agent are added in sequence for treatment, and the tanning agents have certain tanning property and filling property, can improve the performance of crust leather, and also have good dispersion effect, so that on one hand, the chrome tanning agent and chrome-containing tannin can be promoted to uniformly permeate and combine in the leather, and on the other hand, the subsequent crack slurry can be favorably uniformly permeated to the grain surface layer of the crust leather; after the chrome tanning agent and the chrome-containing tannin are retanned, on one hand, the chrome ion content in the leather can be increased, the distribution uniformity of the chrome ions can be improved, the fullness, flexibility, elasticity and other properties of crust leather can be improved, on the other hand, the electropositivity and uniform distribution of the crust leather can be improved, and the combination and fixation of anionic acrylic resin in subsequent cracking slurry in the grain surface layer and the surface are facilitated. Finally, the crack treatment operation is carried out after retanning, and the uniform and natural grain surface crack effect is obtained.
Detailed Description
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the embodiments of the specification.
Example 1: performing a crack treatment operation after rewetting
Step 1, water squeezing and shaving: and (3) squeezing and shaving the selected wet blue leather, weighing the shaved crust leather, and determining the weight parts of the reagents used in the subsequent treatment process steps according to the weight parts.
Step 2, rewetting: putting crust leather into a rotary drum, adding water of 200% at 40 ℃, 1% of ammonia-free deliming agent (DLY of chemical company, Tsingtao), 0.3% of nonionic surfactant (OC of chemical company, Delhi) and 1.5% of oxalic acid (conventional industrial oxalic acid) into the rotary drum, and rotating for 90 min; removing half of the bath solution, adding 4% dispersed tannin (PR-C of Langsheng chemical company) and 2% sulfone synthetic tanning agent (VR of Langsheng chemical company), rotating for 120min, draining, and washing with water.
Step 3, crack treatment: squeezing and stretching the remoistened crust leather, toggling and drying, brushing crack surface slurry, drying in an oven and vibrating and softening, wherein the toggling drying temperature is 50 ℃, the time is 9h, the toggling distance is 6cm, and the water content of the crust leather after toggling is 12-13%; the formula of the split dough paste comprises 120 parts of water, 200 parts of anionic polyacrylic resin (970 of Langshan chemical company) and 20 parts of nonionic penetrant (PT-6806 of Jinjiang trade company); the drying temperature of the oven is 60 ℃, the drying time is 5 hours, and the water content of the baked crust leather is 7-8%; the vibration softening intensity is 5 grades and the times are 2 times.
And 4, sequentially retanning the crust leather obtained in the step 3, neutralizing, filling and dyeing, fatliquoring and dry finishing according to a conventional method.
Example 2: performing crack treatment operation after retanning procedure
Step 1, squeezing and shaving crust leather: and (3) squeezing and shaving the selected low-grade crust leather, weighing the shaved crust leather, and determining the weight parts of the reagents used in the subsequent treatment process steps according to the weight parts.
Step 2, rewetting: the rewetting was performed according to a conventional method.
Step 3, retanning: adding water of 25-35 deg.C 100% and 2% fatty aldehyde tanning agent (NOVALTAN PF of Simma chemical Co.) into the rotary drum, and rotating for 60 min; adding 2% chrome tanning agent (KROMSAN AB from Jinshan trade company) and 3% chrome-containing tannin (CAN from Taige chemical company), and rotating for 60 min; adding 1% sodium formate (conventional industrial sodium formate), and rotating for 30 min; adding 0.6% baking soda (conventional industrial baking soda), rotating for 60min, adjusting bath pH to 3.8-4.0, adding 3% amphoteric synthetic tanning agent (AN of BASF chemical company), rotating for 40min, draining, and washing with water.
Step 4, crack treatment: squeezing and stretching the remoistened crust leather, toggling and drying, brushing crack surface slurry, drying in an oven and vibrating and softening, wherein the toggling drying temperature is 45 ℃, the time is 10h, the toggling distance is 8cm, and the water content of the crust leather after toggling is 12-13%; the formula of the dough cracking slurry comprises 150 parts of water, 250 parts of anionic polyacrylic resin (TP 340 of Apa chemical company) and 30 parts of penetrating agent (PT-4235 of anionic surfactant of Starter chemical company); the drying temperature of the oven is 50 ℃, the drying time is 6 hours, and the water content of the baked crust leather is 7-8%; the vibration softening intensity is 6 grades and the times are 1.
And 5, sequentially neutralizing, filling and dyeing, greasing and dry finishing the crust leather obtained in the step 4 according to a conventional method.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (6)
1. A preparation method of leather comprises the working procedures of wringing, shaving, rewetting, retanning, neutralizing, filling and dyeing, greasing and dry finishing, and is characterized by also comprising a crack treatment working procedure, wherein the crack treatment working procedure is carried out in the rewetting working procedure or after the retanning working procedure;
the crack treatment process comprises the following steps:
(a) providing a crust leather after being rewetted;
(b) carrying out water squeezing, stretching and toggling drying treatment on the crust leather;
(c) brushing crack surface slurry, wherein the preparation method of the crack surface slurry comprises the following steps: uniformly mixing 300 parts of anionic polyacrylic resin polymer 100, 10-50 parts of penetrating agent and 50-250 parts of water;
(d) drying in an oven;
(e) vibrating and softening to obtain uniform and natural crack effect;
the specific operation steps of the rewetting process are as follows: calculated by taking the mass of the wet blue leather as a reference, adding water at 35-45 ℃ of 150-250%, ammonia-free deliming agent at 0.5-1.5%, nonionic surfactant at 0.1-0.5% and oxalic acid at 0.5-2.5% into a rotary drum, and rotating for 60-120 min; draining half of the bath lotion, adding 2-5% of dispersed tannin and 1-3% of sulfone synthetic tanning agent, rotating for 60-120min, draining, and washing with water;
the specific operation steps of the retanning procedure are as follows: calculated by taking the mass of wet blue leather as a reference, adding 50-150% of water with the temperature of 25-35 ℃ and 0.5-2.5% of fatty aldehyde tanning agent into a rotary drum, and rotating for 30-60 min; adding 1-4% chrome tanning agent and 1-4% chrome-containing tannin, and rotating for 60-90 min; adding 0.5-1.5% sodium formate, and rotating for 30-60 min; adding 0.5-1.5% sodium bicarbonate, rotating for 30-60min, adjusting bath pH to 3.8-4.0, adding 1-3% amphoteric synthetic tanning agent, rotating for 30-60min, draining, and washing with water.
2. The method of claim 1, wherein the toggling temperature is 40-60 ℃, the time is 6-12 hours, the toggling distance is 5-10cm, and the moisture content of the crust leather after toggling is 10-15%.
3. The method for preparing leather according to claim 1, wherein the penetrating agent is selected from any one of anionic surfactant and nonionic surfactant.
4. The method for preparing leather according to claim 2, wherein the temperature of oven drying is 50-70 ℃, the time is 3-6h, and the water content of the baked crust leather is 6-10%.
5. The method for preparing leather according to claim 3, wherein the vibration softening strength is 3-6 grades and 1-4 times.
6. Leather produced by the method of any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911094302.9A CN110923374B (en) | 2019-11-11 | 2019-11-11 | Leather and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911094302.9A CN110923374B (en) | 2019-11-11 | 2019-11-11 | Leather and preparation method thereof |
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| CN110923374B true CN110923374B (en) | 2021-11-02 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328515A (en) * | 2007-06-19 | 2008-12-24 | 梁礼沛 | Archaizing treating method of leather surface |
| CN102101101A (en) * | 2009-12-18 | 2011-06-22 | 上海华峰超纤材料股份有限公司 | Highlight cracked superfine fiber leather and preparation method thereof |
| CN103665245A (en) * | 2013-12-06 | 2014-03-26 | 四川达威科技股份有限公司 | Acrylic cracking resin used for leather finish and preparation method thereof |
| CN105155308A (en) * | 2014-07-06 | 2015-12-16 | 耿云花 | Production method of leather achieving crazing sense |
-
2019
- 2019-11-11 CN CN201911094302.9A patent/CN110923374B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328515A (en) * | 2007-06-19 | 2008-12-24 | 梁礼沛 | Archaizing treating method of leather surface |
| CN102101101A (en) * | 2009-12-18 | 2011-06-22 | 上海华峰超纤材料股份有限公司 | Highlight cracked superfine fiber leather and preparation method thereof |
| CN103665245A (en) * | 2013-12-06 | 2014-03-26 | 四川达威科技股份有限公司 | Acrylic cracking resin used for leather finish and preparation method thereof |
| CN105155308A (en) * | 2014-07-06 | 2015-12-16 | 耿云花 | Production method of leather achieving crazing sense |
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| CN110923374A (en) | 2020-03-27 |
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