CN110129489A - A kind of no chromic acid leather makees method - Google Patents
A kind of no chromic acid leather makees method Download PDFInfo
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- CN110129489A CN110129489A CN201910435370.0A CN201910435370A CN110129489A CN 110129489 A CN110129489 A CN 110129489A CN 201910435370 A CN201910435370 A CN 201910435370A CN 110129489 A CN110129489 A CN 110129489A
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- rotary drum
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- degreasing
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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
- C14B1/02—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather
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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
- C14C1/00—Chemical treatment prior to tanning
- C14C1/04—Soaking
-
- 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
- C14C1/00—Chemical treatment prior to tanning
- C14C1/06—Facilitating unhairing, e.g. by painting, by liming
- C14C1/065—Enzymatic unhairing
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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
- C14C1/00—Chemical treatment prior to tanning
- C14C1/08—Deliming; Bating; Pickling; Degreasing
-
- 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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The present invention relates to a kind of no chromic acid leathers to make method, can even inflation, loose suitable, conducive to the infiltration and combination of tanning material and dyestuff, it is ensured that finished leather is soft, grain is flat thin.Specifically sequentially carry out following process: fur immersion → fleshing → pre- degreasing → enzymatic depilation → caustic dip → split → dealkalize → degreasing softening → pickling → acid skin, the wherein concrete operations process of caustic dip process are as follows: depilation skin is placed in rotary drum, controlling liquor ratio is 1.2~1.5,0.2%~0.5% bleeding agent and 0.5%~0.8% sodium bisulfide, low speed rotary drum 10min~15min is added；Then stop drum, moisturizing to adjust pH value in 7-8, then sequentially be added 0.8%~1.0% xonotlite fiber particle, 1.5%~3.0% white lime and 0.8%~1.0% alkaline caustic dip enzyme, low speed rotary drum 30min~45min, looks into skin, and degrees of expansion, which reaches to wash out after requirement, rouses.
Description
Technical field
The present invention relates to leather preparation technical fields, make method more particularly to a kind of no chromic acid leather.
Background technique
Leather processing procedure can be divided into beam house and tanning process, and beam house is handled hide to meet tan
The related requirement of system, beam house generally relate to immersion, fleshing, depilation, degreasing, liming alkali, deliming, softening and the leaching of hide
The processes such as acid, purpose is mainly sought to so that the collagenous fibres inside hide separate as far as possible, is loose, but it is swollen to control its again
Swollen degree, be otherwise easy to cause the empty pine of leather, it is flat thin, elongation percentage is excessive, loose side the defects of, especially liming alkali process.It is existing
Leather liming alkali process generally use white lime and vulcanized sodium, the hydroxyl concentration that vulcanized sodium hydrolysis generates is larger, liming alkali
The alkalinity variation of liquid is very fast, occur the expansion of hide surface layer in this way and internal layer still in not swelling state differential expansion situation,
Interior pressure difference between cortex increases, and increases the junction stress of different expanding layers, thus damaged fiber structure.In order to accomplish
Even slow expansion then needs gradation that vulcanized sodium is added and is aided with slow rotation again, and the liming alkali time is longer, is easily formed on rawhide
Greyness generates embrittlement broken face to interfere the infiltration of tanning material and dyestuff.And vulcanized sodium is also easy to make skin swelling.
Summary of the invention
To overcome technological deficiency of the existing technology, the present invention provides a kind of no chromic acid leather and makees method, can be uniformly swollen
It is swollen, loose suitable, conducive to the infiltration and combination of tanning material and dyestuff, it is ensured that finished leather is soft, grain is flat thin.
The technical solution that the present invention uses is:
A kind of no chromic acid leather makees method, sequentially carries out following process: fur immersion → fleshing → pre- degreasing → enzymatic depilation → leaching
Alkali → split → dealkalize → degreasing softening → pickling → acid skin, wherein the concrete operations process of caustic dip process are as follows: set depilation skin
In in rotary drum, control liquor ratio is 1.2~1.5, be added 0.2% (owf)~0.5% (owf) bleeding agent and 0.5% (owf)~
The sodium bisulfide of 0.8% (owf), low speed rotary drum 10min~15min；Then stop drum, moisturizing to adjust pH value in 7-8, then according to
The white lime of the xonotlite fiber particle of 0.8% (owf)~1.0% (owf), 1.5% (owf)~3.0% (owf) is added in sequence
And 0.8% (owf)~1.0% (owf) alkaline caustic dip enzyme, low speed rotary drum 30min~45min looks into skin, and degrees of expansion reaches
It washes out and rouses after it is required that.
Preferably, the concrete operations process of the pre- degreasing process are as follows: pork skin will be gone to be placed in rotary drum, control liquor ratio is
1.0~1.5, the alkalinity of the Pastosol U and 0.8% (owf)~1.2% (owf) of 0.2% (owf)~0.4% (owf) is added
Defatting enzyme directly carries out subsequent processing after rotary drum 30min~40min.
Preferably, the alkaline defatting enzyme is alkaline lipase Greasex 50L.
Preferably, the alkaline caustic dip enzyme is NUE0.6MPX.
Preferably, the concrete operations process of the enzymatic depilation process are as follows: continuously added in the rotary drum after the completion of pre- degreasing
The neutral proteinase of 0.4% (owf)~0.5% (owf), the pancreatin of 0.2% (owf)~0.3% (owf) and 0.5% (owf)~
The sodium glutamate of 0.8% (owf), liquid temperature are 36 DEG C~40 DEG C, stop to rouse 20min~30min after every rotary drum 30min~40min, such as
This turns 3-4 times, stops drum overnight, next day, which washes out, rouses.
Preferably, the neutral proteinase is at least one of 166 neutral proteinases, AS1.398 neutral enzymatic.
Preferably, the concrete operations process of the dealkalize process are as follows: the double-layer fur obtained after split is placed in rotary drum, is controlled
Liquor ratio processed is 1.0~1.5, and the deliming agent of 1.5% (owf)~1.8% (owf), the 4A zeolite and 3g/L of 3g/L~5g/L is added
The metasilicate pentahydrate sodium of~5g/L, it is substantially colorless that rotary drum to phenolphthalein looks into notch.
Preferably, the deliming agent is at least one of deliming agent R3, Decatal N.
Preferably, the concrete operations process of the degreasing softening process are as follows: dealkalize skin is placed in rotary drum, control liquor ratio is
1.0~1.2, for liquid temperature control system at 28 DEG C~30 DEG C, pH value control is added 0.2% (owf)~0.5% (owf's) 7.5~8.0
Degreasing agent OC, the rotary drum 100min~150min of low temperature softening enzyme EB and 0.3% (owf)~0.5% (owf) look into skin, expand journey
It spends after reaching requirement to wash out and rouse.
Preferably, the concrete operations process of the pickling procedure are as follows: softening skin is placed in rotary drum, control liquor ratio is 1.0
~1.2, be added the neutral salt of 10g/L, rotary drum 20min~25min, neutral salt add after completely dissolution 0.5% (owf)~
The formic acid of 0.8% (owf), rotary drum 30min~35min, the concentrated sulfuric acid after being then added three times dilution again, every time 0.4%
(owf)~0.5% pH value is looked into after (owf) and each rotary drum 30min, is stood after 2.8 ± 0.2 after pH value；It is put after standing 2 hours
Water, folding water squeezing to water content after skin stands 1-2 days is 60%~70%, and shaving is up to sour skin.
Beneficial effects of the present invention:
On the one hand the present invention removes the intradermal external fat in part and few fibers interstitial by pre- degreasing process, be convenient for subsequent handling
On the other hand work material weakens contacting for the skin tissues such as epidermis, hair follicle and skin, is ready for depilation to the osmosis of skin；
The present invention is lost hair or feathers by enzymatic depilation process using neutral proteinase and the compound enzyme of pancreatin, while being additionally added glutamic acid
Sodium can reach except the hair phase epidermis in peeling, hair can recycle, go to allowance for bark with inhibiting compound enzyme to the effect of intradermal collagenous fibres
Interior interfibrillar substance softens pelt, and separable collagenous fibres, elastomer and arrector pili are destroyed, and pelt is soft；
The present invention uses sodium bisulfide as alkaline agent by caustic dip process, and sodium bisulfide is fine in the diffusion of tare weight, cooperation infiltration
Agent can preferably infiltrate into endo-endothelial layer, and since the hydroxyl concentration of release is less with respect to for vulcanized sodium, generate hydrolysis
Sodium hydroxide reduce, reduce pelt swelling, control initial stage degrees of expansion while also further removal interfibrillar substance, be the later period
Xonotlite fiber particle, white lime and the infiltration of alkaline caustic dip enzyme create favorable conditions；Then pH to 7-8 is adjusted, micro-
Xonotlite fiber particle, white lime and alkaline caustic dip enzyme are added in the case of alkali, using xonotlite fiber particle in micro- alkali
Under the conditions of slow release calcium ion the characteristics of, calcium ion in conjunction with hydroxyl again formed calcium hydroxide and play control caustic dip liquid
The concentration of middle hydroxy radical, so that the pH stable of caustic dip liquid whithin a period of time is conducive to hard silico-calcium in 7-8 or so
Mineral wool particle, white lime and alkaline caustic dip enzyme penetrate into endo-endothelial layer, after xonotlite fiber particle decomposes completely by
White lime decomposes the hydroxyl of generation again and gradually promotes caustic dip liquid pH value, with pH value raising hide expansion also gradually
Increase and the expansion phase of intradermal outer layer is to uniformity, and the caustic dip period also accordingly shortens；In addition, caustic dip skin is after caustic dip, matter
Amount, thickness and elasticity increase, and are convenient for split, obtain double-layer fur；
The present invention removes intracutaneous free alkali by dealkalize process and combines alkali, reduces the pH value of skin to 7-8 or so, substantially eliminates
The expansion of skin, the catabolite, hair root, part for further removing the lime-preserved egg bletilla lipid remained between materials with hide glue fibril are non-
Collagen and scurf etc. influence the substance of finished leather performance, dredge fibre gap, and 4A is used in dealkalize process of the present invention
Zeolite and metasilicate pentahydrate sodium chelate calcium ions and magnesium ions by 4A zeolite and metasilicate pentahydrate sodium and can prevent insoluble dirt from sinking again
Product is conducive to sufficiently washing and removes alkali object and interfibrillar substance etc.；
Low temperature softening enzyme EB and degreasing agent OC is used in degreasing softening process of the present invention, degreasing, softening are carried out with bath, low temperature softening
Enzyme EB is the special enzyme preparation being made of complex microorganism and multiple additives, has hydrolysis non-collagen, polysaccharide and fat
Etc. a variety of effects, optimal pH 7.5-8 can soften pelt without injuring grain, and intradermal outer softening is more uniform；
Uniformly using the sour skin even inflation of production method of the present invention acquisition, loose suitable, softening, conducive to the infiltration of tanning material and dyestuff
It thoroughly and combines, it is ensured that finished leather softness, grain flat particulate face, not loose side.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of no chromic acid leathers to make method, sequentially carries out following process: fur immersion → fleshing → pre- degreasing
→ enzymatic depilation → caustic dip → split → dealkalize → degreasing softening → pickling → acid skin, by taking cattle hide as an example.
Wherein: immersion, fleshing use common process, the concrete operations process of the pre- degreasing process are as follows: by fleshing
Skin is placed in rotary drum, and control liquor ratio is 1.0, and the alkaline defatting enzyme of the Pastosol U and 1.0% (owf) of 0.2% (owf) is added
Enzymatic depilation is directly carried out after Greasex 50L, rotary drum 40min.
The concrete operations process of the enzymatic depilation process are as follows: continuously add 0.4% in the rotary drum after the completion of pre- degreasing
(owf) pancreatin of 166 neutral proteinases, 0.2% (owf) and the sodium glutamate of 0.5% (owf), liquid temperature are 36 DEG C~40 DEG C,
Stop to rouse 20min after every rotary drum 40min, so turn 3 times, stops drum overnight, next day, which washes out, rouses.
The concrete operations process of the caustic dip process are as follows: depilation skin is placed in rotary drum, control liquor ratio is 1.2, is added
The sodium bisulfide of the isooctanol polyethoxylate of 0.3% (owf) and 0.6% (owf), low speed rotary drum 15min；Then stop drum, mend
The xonotlite fiber particle of 0.8% (owf), the white lime of 2.0% (owf) is then sequentially added to adjust pH value in 7-8 in water
And 0.8% (owf) alkaline caustic dip enzyme NUE0.6MPX, low speed rotary drum 30min~45min looks into skin, and degrees of expansion, which reaches, to be wanted
It washes out and rouses after asking, musculus cutaneus is cut off by splitter, take double-layer fur as subsequent handling materials.
The concrete operations process of the dealkalize process are as follows: the double-layer fur obtained after split is placed in rotary drum, controls liquor ratio
It is 1.0, the 4A zeolite of deliming agent R3,3g/L of 1.5% (owf) and the metasilicate pentahydrate sodium of 3g/L is added, rotary drum to phenolphthalein is looked into
Notch is substantially colorless.
The concrete operations process of the degreasing softening process are as follows: dealkalize skin is placed in rotary drum, control liquor ratio is 1.2, liquid
For temperature control system at 28 DEG C~30 DEG C, the low temperature softening enzyme EB and 0.3% of 0.3% (owf) is added 7.5~8.0 in pH value control
(owf) degreasing agent OC, rotary drum 100min~150min, look into skin, and degrees of expansion, which reaches to wash out after requirement, rouses.
The concrete operations process of the pickling procedure are as follows: softening skin is placed in rotary drum, control liquor ratio is 1.0, is added
The NaCl of 10g/L, rotary drum 20min~25min add the formic acid of 0.5% (owf), rotary drum in NaCl after completely dissolution
30min, the concentrated sulfuric acid being then added three times again after being diluted with 12 times of water are looked into after 0.4% (owf) and each rotary drum 30min every time
PH value is stood after 2.8 ± 0.2 after pH value；It discharges water after standing 2 hours, folding water squeezing to water content after skin stands 1-2 days is 60%
~70%, shaving is up to sour skin, and sour skin grain is completely put down carefully, not loose side.
Embodiment 2
The present embodiment provides a kind of no chromic acid leathers to make method, sequentially carries out following process: fur immersion → fleshing → pre- degreasing
→ enzymatic depilation → caustic dip → split → dealkalize → degreasing softening → pickling → acid skin, by taking cattle hide as an example.
Wherein: immersion, fleshing use common process, the concrete operations process of the pre- degreasing process are as follows: by fleshing
Skin is placed in rotary drum, and control liquor ratio is 1.5, and the alkaline defatting enzyme of the Pastosol U and 1.0% (owf) of 0.4% (owf) is added
Enzymatic depilation is directly carried out after Greasex 50L, rotary drum 35min.
The concrete operations process of the enzymatic depilation process are as follows: continuously add 0.5% in the rotary drum after the completion of pre- degreasing
(owf) pancreatin of AS1.398 neutral proteinase, 0.3% (owf) and the sodium glutamate of 0.6% (owf), liquid temperature be 36 DEG C~
40 DEG C, stops after every rotary drum 30min to rouse 30min, so turn 4 times, stop drum overnight, next day, which washes out, rouses.
The concrete operations process of the caustic dip process are as follows: depilation skin is placed in rotary drum, control liquor ratio is 1.5, is added
The sodium bisulfide of the penetrating agent JFC of 0.5% (owf) and 0.8% (owf), low speed rotary drum 10min；Then stop drum, moisturizing to adjust
PH value in 7-8, be then sequentially added the xonotlite fiber particle of 1.0% (owf), 3.0% (owf) white lime and
The alkaline caustic dip enzyme NUE0.6MPX of 0.8% (owf), low speed rotary drum 30min~45min look into skin, after degrees of expansion reaches requirement
It washes out and rouses, musculus cutaneus is cut off by splitter, take double-layer fur as subsequent handling materials.
The concrete operations process of the dealkalize process are as follows: the double-layer fur obtained after split is placed in rotary drum, controls liquor ratio
It is 1.2, deliming agent Decatal N, the 4A zeolite of 5g/L and the metasilicate pentahydrate sodium of 5g/L of 1.8% (owf) is added, rotary drum is extremely
It is substantially colorless that phenolphthalein looks into notch.
The concrete operations process of the degreasing softening process are as follows: dealkalize skin is placed in rotary drum, control liquor ratio is 1.2, liquid
For temperature control system at 28 DEG C~30 DEG C, the low temperature softening enzyme EB and 0.3% of 0.5% (owf) is added 7.5~8.0 in pH value control
(owf) degreasing agent OC, rotary drum 100min~150min, look into skin, and degrees of expansion, which reaches to wash out after requirement, rouses.
The concrete operations process of the pickling procedure are as follows: softening skin is placed in rotary drum, control liquor ratio is 1.2, is added
The sodium sulphate of 10g/L, rotary drum 20min~25min add the formic acid of 0.6% (owf), rotary drum in sodium sulphate after completely dissolution
35min, the concentrated sulfuric acid being then added three times again after being diluted with 12 times of water are looked into after 0.4% (owf) and each rotary drum 30min every time
PH value is stood after 2.8 ± 0.2 after pH value；It discharges water after standing 2 hours, folding water squeezing to water content after skin stands 1-2 days is 60%
~70%, shaving is up to sour skin, and sour skin grain is completely put down carefully, not loose side.
Embodiment 3
The present embodiment provides a kind of no chromic acid leathers to make method, sequentially carries out following process: fur immersion → fleshing → pre- degreasing
→ enzymatic depilation → caustic dip → split → dealkalize → degreasing softening → pickling → acid skin, by taking cattle hide as an example.
Wherein: immersion, fleshing use common process, the concrete operations process of the pre- degreasing process are as follows: by fleshing
Skin is placed in rotary drum, and control liquor ratio is 1.2, and the alkaline defatting enzyme of the Pastosol U and 1.2% (owf) of 0.3% (owf) is added
Enzymatic depilation is directly carried out after Greasex 50L, rotary drum 30min.
The concrete operations process of the enzymatic depilation process are as follows: continuously add 0.3% in the rotary drum after the completion of pre- degreasing
(owf)~166 neutral proteinase, the AS1.398 neutral enzymatic of 0.2% (owf), the pancreatin of 0.2% (owf) and 0.8% (owf)
Sodium glutamate, liquid temperature are 36 DEG C~40 DEG C, stop to rouse 20min after every rotary drum 40min, so turn 3 times, stop drum overnight, next day washing
It rouses out.
The concrete operations process of the caustic dip process are as follows: depilation skin is placed in rotary drum, control liquor ratio is 1.2, is added
The sodium bisulfide of the isooctanol polyethoxylate of 0.2% (owf) and 0.5% (owf), low speed rotary drum 15min；Then stop drum, mend
The xonotlite fiber particle of 0.8% (owf), the white lime of 1.5% (owf) is then sequentially added to adjust pH value in 7-8 in water
And 1.0% (owf) alkaline caustic dip enzyme NUE0.6MPX, low speed rotary drum 30min~45min looks into skin, and degrees of expansion, which reaches, to be wanted
It washes out and rouses after asking, musculus cutaneus is cut off by splitter, take double-layer fur as subsequent handling materials.
The concrete operations process of the dealkalize process are as follows: the double-layer fur obtained after split is placed in rotary drum, controls liquor ratio
It is 1.5, the 4A zeolite and 4g/L of the deliming agent R3 of 1.0% (owf), deliming agent Decatal N of 0.5% (owf), 4g/L is added
Metasilicate pentahydrate sodium, it is substantially colorless that rotary drum to phenolphthalein looks into notch.
The concrete operations process of the degreasing softening process are as follows: dealkalize skin is placed in rotary drum, control liquor ratio is 1.0, liquid
For temperature control system at 28 DEG C~30 DEG C, the low temperature softening enzyme EB and 0.4% of 0.2% (owf) is added 7.5~8.0 in pH value control
(owf) degreasing agent OC, rotary drum 100min~150min, look into skin, and degrees of expansion, which reaches to wash out after requirement, rouses.
The concrete operations process of the pickling procedure are as follows: softening skin is placed in rotary drum, control liquor ratio is 1.0, is added
The NaCl of 10g/L, rotary drum 20min~25min add the formic acid of 0.8% (owf), rotary drum in NaCl after completely dissolution
35min, the concentrated sulfuric acid being then added three times again after being diluted with 12 times of water are looked into after 0.4% (owf) and each rotary drum 30min every time
PH value is stood after 2.8 ± 0.2 after pH value；It discharges water after standing 2 hours, folding water squeezing to water content after skin stands 1-2 days is 60%
~70%, shaving is up to sour skin, and sour skin grain is completely put down carefully, not loose side.
Embodiment 4
The present embodiment provides a kind of no chromic acid leathers to make method, sequentially carries out following process: fur immersion → fleshing → pre- degreasing
→ enzymatic depilation → caustic dip → split → dealkalize → degreasing softening → pickling → acid skin, by taking pigskin as an example.
Wherein: immersion, fleshing use common process, the concrete operations process of the pre- degreasing process are as follows: by fleshing
Skin is placed in rotary drum, and control liquor ratio is 1.2, and the alkaline defatting enzyme of the Pastosol U and 0.8% (owf) of 0.4% (owf) is added
Enzymatic depilation is directly carried out after Greasex 50L, rotary drum 30min.
The concrete operations process of the enzymatic depilation process are as follows: continuously add 0.4% in the rotary drum after the completion of pre- degreasing
(owf) pancreatin of 166 neutral proteinases, 0.2% (owf) and the sodium glutamate of 0.5% (owf), liquid temperature are 36 DEG C~40 DEG C,
Stop to rouse 30min after every rotary drum 30min, so turn 4 times, stops drum overnight, next day, which washes out, rouses.
The concrete operations process of the caustic dip process are as follows: depilation skin is placed in rotary drum, control liquor ratio is 1.2, is added
The sodium bisulfide of the penetrating agent JFC of 0.3% (owf) and 0.6% (owf), low speed rotary drum 12min；Then stop drum, moisturizing to adjust
PH value in 7-8, be then sequentially added the xonotlite fiber particle of 1.0% (owf), 2.5% (owf) white lime and
The alkaline caustic dip enzyme NUE0.6MPX of 0.8% (owf), low speed rotary drum 30min~45min look into skin, after degrees of expansion reaches requirement
It washes out and rouses, musculus cutaneus is cut off by splitter, take double-layer fur as subsequent handling materials.
The concrete operations process of the dealkalize process are as follows: the double-layer fur obtained after split is placed in rotary drum, controls liquor ratio
It is 1.2, the 4A zeolite of deliming agent R3,5g/L of 1.8% (owf) and the metasilicate pentahydrate sodium of 5g/L is added, rotary drum to phenolphthalein is looked into
Notch is substantially colorless.
The concrete operations process of the degreasing softening process are as follows: dealkalize skin is placed in rotary drum, control liquor ratio is 1.0, liquid
For temperature control system at 28 DEG C~30 DEG C, the low temperature softening enzyme EB and 0.4% of 0.4% (owf) is added 7.5~8.0 in pH value control
(owf) degreasing agent OC, rotary drum 100min~150min, look into skin, and degrees of expansion, which reaches to wash out after requirement, rouses.
The concrete operations process of the pickling procedure are as follows: softening skin is placed in rotary drum, control liquor ratio is 1.0, is added
The NaCl of 10g/L, rotary drum 25min add the formic acid of 0.6% (owf) in NaCl after completely dissolution, rotary drum 30min, then again
The concentrated sulfuric acid being added three times after being diluted with 12 times of water looks into pH value after 0.5% (owf) and each rotary drum 30min every time, to pH value
It is stood after 2.8 ± 0.2；It discharges water after standing 2 hours, folding water squeezing to water content after skin stands 1-2 days is 60%~70%, shaving
Up to sour skin, sour skin grain is completely put down carefully, not loose side.
The basic principles and main features and advantages of the present invention of the invention have been shown and described above, the industry
For technical staff it should be appreciated that the present invention is not limited to the above embodiments, what is described in the above embodiment and the description is only say
Bright the principle of the present invention, under the premise of not departing from the inventive spirit of the present invention and range, the present invention also has various change and changes
Into these changes and improvements all fall within the protetion scope of the claimed invention, and the claimed scope of the invention is by appended right
Claim and its equivalent thereof.
Claims (10)
1. a kind of no chromic acid leather makees method, which is characterized in that sequentially carry out following process: fur immersion → fleshing → pre- degreasing
→ enzymatic depilation → caustic dip → split → dealkalize → degreasing softening → pickling → acid skin, wherein the concrete operations process of caustic dip process
Are as follows: will depilation skin be placed in rotary drum, control liquor ratio be 1.2~1.5, be added 0.2% (owf)~0.5% (owf) bleeding agent and
The sodium bisulfide of 0.5% (owf)~0.8% (owf), low speed rotary drum 10min~15min；Then stop drum, moisturizing to adjust pH value
In 7-8, xonotlite fiber particle, 1.5% (owf)~3.0% of 0.8% (owf)~1.0% (owf) is then sequentially added
(owf) the alkaline caustic dip enzyme of white lime and 0.8% (owf)~1.0% (owf), low speed rotary drum 30min~45min are looked into
Skin, degrees of expansion, which reaches to wash out after requirement, rouses.
2. no chromic acid leather according to claim 1 makees method, which is characterized in that the concrete operations of the pre- degreasing process
Process are as follows: pork skin will be gone to be placed in rotary drum, control liquor ratio is 1.0~1.5, is added 0.2% (owf)~0.4% (owf's)
The alkaline defatting enzyme of Pastosol U and 0.8% (owf)~1.2% (owf) directly carry out after rotary drum 30min~40min next
Process.
3. no chromic acid leather according to claim 2 makees method, which is characterized in that the alkalinity defatting enzyme is alkaline fat
Enzyme Greasex 50L.
4. no chromic acid leather according to claim 3 makees method, which is characterized in that it is described alkalinity caustic dip enzyme be
NUE0.6MPX。
5. no chromic acid leather according to claim 1 makees method, which is characterized in that the concrete operations of the enzymatic depilation process
Process are as follows: continuously added in the rotary drum after the completion of pre- degreasing 0.4% (owf)~0.5% (owf) neutral proteinase, 0.2%
(owf)~0.3% the sodium glutamate of the pancreatin of (owf) and 0.5% (owf)~0.8% (owf), liquid temperature are 36 DEG C~40 DEG C, often
Stop to rouse 20min~30min after rotary drum 30min~40min, so turn 3-4 times, stops drum overnight, next day, which washes out, rouses.
6. no chromic acid leather according to claim 5 makees method, which is characterized in that the neutral proteinase is 166 neutral
At least one of protease, AS1.398 neutral enzymatic.
7. no chromic acid leather according to claim 1 makees method, which is characterized in that the concrete operations stream of the dealkalize process
Journey are as follows: the double-layer fur obtained after split is placed in rotary drum, control liquor ratio is 1.0~1.5, and 1.5% (owf)~1.8% is added
(owf) deliming agent, the 4A zeolite of 3g/L~5g/L and the metasilicate pentahydrate sodium of 3g/L~5g/L, rotary drum to phenolphthalein look into notch base
This is colourless.
8. no chromic acid leather according to claim 7 makees method, which is characterized in that the deliming agent be deliming agent R3,
At least one of Decatal N.
9. no chromic acid leather according to claim 1 makees method, which is characterized in that the specific behaviour of the degreasing softening process
Make process are as follows: dealkalize skin is placed in rotary drum, control liquor ratio is 1.0~1.2, and at 28 DEG C~30 DEG C, pH value controls liquid temperature control system
7.5~8.0, it is added the low temperature softening enzyme EB's and 0.3% (owf)~0.5% (owf) of 0.2% (owf)~0.5% (owf)
Degreasing agent OC, rotary drum 100min~150min, look into skin, and degrees of expansion, which reaches to wash out after requirement, rouses.
10. no chromic acid leather according to claim 1 makees method, which is characterized in that the concrete operations of the pickling procedure
Process are as follows: softening skin is placed in rotary drum, control liquor ratio is 1.0~1.2, it is added the neutral salt of 10g/L, rotary drum 20min~
25min adds the formic acid of 0.5% (owf)~0.8% (owf) in neutral salt after completely dissolution, rotary drum 30min~35min,
Then the concentrated sulfuric acid after being added three times dilution again looks into pH after 0.4% (owf)~0.5% (owf) and each rotary drum 30min every time
Value, stands after 2.8 ± 0.2 after pH value；Discharge water after standing 2 hours, fold after skin stands 1-2 days water squeezing to water content for 60%~
70%, shaving is up to sour skin.
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| CN201910435370.0A CN110129489B (en) | 2019-05-23 | 2019-05-23 | Method for preparing chrome-free pickled skin |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910435370.0A CN110129489B (en) | 2019-05-23 | 2019-05-23 | Method for preparing chrome-free pickled skin |
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| CN110129489B CN110129489B (en) | 2021-10-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115323081A (en) * | 2022-09-23 | 2022-11-11 | 四川大学 | Softening method for preventing damaged surface and loose surface of leather |
| CN116210677A (en) * | 2022-09-07 | 2023-06-06 | 蚌埠医学院 | Method for manufacturing whole body nerve specimen of rabbit |
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|---|---|---|---|---|
| CN101445843A (en) * | 2008-12-30 | 2009-06-03 | 国家皮革质量监督检验中心（浙江） | Method for carrying out unhairing and liming treatment without dust and akali sulphide during buffalo hide tanning |
| CN101509045A (en) * | 2008-12-11 | 2009-08-19 | 湖南省怀其皮革集团制革有限公司 | Sodium sulfide-free, lime-free depilation caustic dip method for lining leather of high-grade pig leather shoes |
| CN105671219A (en) * | 2016-03-04 | 2016-06-15 | 海宁上元皮革有限责任公司 | Tanning production technology |
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2019
- 2019-05-23 CN CN201910435370.0A patent/CN110129489B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509045A (en) * | 2008-12-11 | 2009-08-19 | 湖南省怀其皮革集团制革有限公司 | Sodium sulfide-free, lime-free depilation caustic dip method for lining leather of high-grade pig leather shoes |
| CN101445843A (en) * | 2008-12-30 | 2009-06-03 | 国家皮革质量监督检验中心（浙江） | Method for carrying out unhairing and liming treatment without dust and akali sulphide during buffalo hide tanning |
| CN105671219A (en) * | 2016-03-04 | 2016-06-15 | 海宁上元皮革有限责任公司 | Tanning production technology |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116210677A (en) * | 2022-09-07 | 2023-06-06 | 蚌埠医学院 | Method for manufacturing whole body nerve specimen of rabbit |
| CN115323081A (en) * | 2022-09-23 | 2022-11-11 | 四川大学 | Softening method for preventing damaged surface and loose surface of leather |
| CN115323081B (en) * | 2022-09-23 | 2023-08-18 | 四川大学 | Softening method for preventing leather from damaging and loosening |
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| Publication number | Publication date |
|---|---|
| CN110129489B (en) | 2021-10-01 |
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