CN108588305A - A kind of natural leather degreasing process based on enzymatic isolation method - Google Patents
A kind of natural leather degreasing process based on enzymatic isolation method Download PDFInfo
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- CN108588305A CN108588305A CN201810288780.2A CN201810288780A CN108588305A CN 108588305 A CN108588305 A CN 108588305A CN 201810288780 A CN201810288780 A CN 201810288780A CN 108588305 A CN108588305 A CN 108588305A
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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
- C14C5/00—Degreasing leather
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a kind of natural leather degreasing process based on enzymatic isolation method, is related to leather processing technique field, including operate as follows：(1) one sub-high pressure softens, (2) enzyme process degreasing, the softening of (3) secondary high-pressure, (4) cleaning.The present invention by two sub-high pressure sofening treatments come fast softening natural leather, to weaken adhesive force of the grease on natural leather, to be conducive to subsequent ungrease treatment；And effectively remove the grease on natural leather using the enzymolysis of alkaline lipase, by grease hydrolysis at glycerine and aliphatic acid, the adipose gland inside leather and the grease in free-fat cell can also efficiently be removed by digesting degreasing method simultaneously, remaining micro grease on leather is removed in the addition of sodium bicarbonate in clear water when again by finally cleaning, and further increases degreasing rate.
Description
Technical field：
The present invention relates to leather processing technique fields, and in particular to a kind of natural leather degreasing process based on enzymatic isolation method.
Background technology：
In leather processing procedure, since there are a certain amount of fat for natural leather, if without ungrease treatment, it will resistance
Hinder leather-making technology material to intracutaneous infiltration, and the aliphatic acid of grease hydrolysis generation can be reacted to be formed with metal ion and not dissolved in
The metallic soap salt of water is unfavorable for dyeing processing.Therefore, degreasing process is vital together in natural leather process
Process.
Emulsion process degreasing is a kind of most widely used degreasing means of leather industry, and also known as surfactant degreasing utilizes
Surfactant-based degreasing agent can slough the grease of 90% or more rawhide.But leather degreasing will not only remove the oil of hide surface
Fat also removes the adipose gland inside rawhide and the grease in free-fat cell, and this requires surfactants in degreasing agent
Should not only have good emulsification dirt-removing power, but also should have and infiltrate through the oil in adipose gland and adipocyte inside cortex
Fat moves to the ability outside skin.But current single surfactant cannot be satisfied such use demand, and compound surfactant
There is a problem of big, the produced sewage composition complexity of foam yield again, is unfavorable for the cleaning of follow-up leather and the processing of sewage.
Invention content：
Technical problem to be solved by the present invention lies in a kind of degreasing rates of offer to reach useless produced by 90% or more and degreasing
Water process difficulty is small, the good natural leather degreasing process based on enzymatic isolation method of the feature of environmental protection.
The technical problems to be solved by the invention are realized using technical solution below：
A kind of natural leather degreasing process based on enzymatic isolation method, including operate as follows：
(1) one sub-high pressure softens：First will natural leather be added autoclave in, start vacuum pump vacuumize make pressure reach-
0.08 to -0.1MPa, then be passed through 50-55 DEG C of temperature, relative humidity 65-75% humid air, protected after pressure reaches 3.5MPa
15-30min is pressed, is finally restored to normal pressure；
(2) enzyme process degreasing：Leather after pretreatment is impregnated in enzymolysis liquid, enzymolysis liquid adds water to match by alkaline lipase
It makes, 30-40 DEG C of enzymolysis liquid temperature, pH value 7-8, leather is removed into extra enzymolysis liquid through roll-in after enzymolysis, and utilize
Clear water rinses；
(3) secondary high-pressure softens：Leather after enzyme process degreasing is added in autoclave again, starts vacuum pump and vacuumizes
So that pressure is reached -0.08 to -0.1MPa, then is passed through the dry air of 50-55 DEG C of temperature, the pressurize 10- after pressure reaches 5MPa
15min finally restores to normal pressure；
(4) it cleans：Leather after secondary high-pressure softens is impregnated in the clear water dissolved with sodium bicarbonate, after 10-15min
Leather is taken out, and is rinsed using clear water, is finally dried at 45-55 DEG C.
The additive amount of step (2) the neutral and alkali lipase accounts for the 0.5-1% of natural leather gross weight.
The mass ratio of sodium bicarbonate and clear water is 1-5 in the step (4):95-100.
Dissolved with poloxamer-polyglutamic acid carboxylate in clear water used when clear water rinses in the step (2), per 50kg
Clear water dissolves 0.5-2.5kg poloxamers-polyglutamic acid carboxylate.
The poloxamer-polyglutamic acid carboxylate is by PLURONICS F87 and water process grade polyglutamic acid through esterification
Reaction is made, and preparation method is：It is dissolved in water, and is added dropwise after PLURONICS F87 and water process grade polyglutamic acid are mixed
Dilute sulfuric acid adjusts solution ph to 4-5, is again heated to reflux state insulated and stirred, contains admittedly through being concentrated under reduced pressure to be made after reaction
The lotion of 75-85% is measured, lotion is sent into after cooled to room temperature in freeze drier, and dry obtained solid is through ultramicro grinding
Micro mist is made to get poloxamer-polyglutamic acid carboxylate in machine.
The PLURONICS F87, water process grade polyglutamic acid mass ratio be 5-10:10-20.
The beneficial effects of the invention are as follows：
(1) present invention by two sub-high pressure sofening treatments come fast softening natural leather, to weaken grease in natural leather
On adhesive force, to be conducive to subsequent ungrease treatment；
(2) present invention effectively removes the grease on natural leather using the enzymolysis of alkaline lipase, by grease water
Solution digests degreasing method and can also efficiently remove the adipose gland inside leather and the oil in free-fat cell at glycerine and aliphatic acid
Fat；And waste component caused by enzymatic isolation method is simple, and environmental pollution is small；
(3) remaining micro oil on leather is removed in the addition of sodium bicarbonate in clear water when the present invention is by finally cleaning
Fat further increases degreasing rate.
Specific implementation mode：
In order to make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, tie below
Specific embodiment is closed, the present invention is further explained.
Embodiment 1
(1) one sub-high pressure softens：First will natural leather be added autoclave in, start vacuum pump vacuumize make pressure reach-
0.08 to -0.1MPa, then be passed through 50-55 DEG C of temperature, relative humidity 65-75% humid air, protected after pressure reaches 3.5MPa
20min is pressed, is finally restored to normal pressure；
(2) enzyme process degreasing：Leather after pretreatment is impregnated in enzymolysis liquid, enzymolysis liquid adds water to match by alkaline lipase
It makes, 30-40 DEG C of enzymolysis liquid temperature, pH value 7-8, leather is removed into extra enzymolysis liquid through roll-in after enzymolysis, and utilize
Clear water rinses；
(3) secondary high-pressure softens：Leather after enzyme process degreasing is added in autoclave again, starts vacuum pump and vacuumizes
So that pressure is reached -0.08 to -0.1MPa, then is passed through the dry air of 50-55 DEG C of temperature, the pressurize 10min after pressure reaches 5MPa,
Finally restore to normal pressure；
(4) it cleans：Leather after secondary high-pressure softens is impregnated in the clear water dissolved with sodium bicarbonate, is taken after 15min
Go out leather, and rinsed using clear water, is finally dried at 45-55 DEG C.
The additive amount of step (2) neutral and alkali lipase accounts for the 0.8% of natural leather gross weight, and alkaline lipase selects mass ratio
1:1 alkaline lipase DENIE-DEGNS-E and the DENIE-DEG NL- produced by the Shanghai bio tech ltd Dan Niyue
L。
The mass ratio of sodium bicarbonate and clear water is 2.5 in step (4):97.5.
Embodiment 2
(1) one sub-high pressure softens：First will natural leather be added autoclave in, start vacuum pump vacuumize make pressure reach-
0.08 to -0.1MPa, then be passed through 50-55 DEG C of temperature, relative humidity 65-75% humid air, protected after pressure reaches 3.5MPa
20min is pressed, is finally restored to normal pressure；
(2) enzyme process degreasing：Leather after pretreatment is impregnated in enzymolysis liquid, enzymolysis liquid adds water to match by alkaline lipase
It makes, 30-40 DEG C of enzymolysis liquid temperature, pH value 7-8, leather is removed into extra enzymolysis liquid through roll-in after enzymolysis, and utilize
It is rinsed dissolved with the clear water of poloxamer-polyglutamic acid carboxylate, per 50kg clear water dissolving 1.5kg poloxamers-more polyglutamics
Acid esters compound；
(3) secondary high-pressure softens：Leather after enzyme process degreasing is added in autoclave again, starts vacuum pump and vacuumizes
So that pressure is reached -0.08 to -0.1MPa, then is passed through the dry air of 50-55 DEG C of temperature, the pressurize 10min after pressure reaches 5MPa,
Finally restore to normal pressure；
(4) it cleans：Leather after secondary high-pressure softens is impregnated in the clear water dissolved with sodium bicarbonate, is taken after 15min
Go out leather, and rinsed using clear water, is finally dried at 45-55 DEG C.
The additive amount of step (2) neutral and alkali lipase accounts for the 0.8% of natural leather gross weight, and alkaline lipase selects mass ratio
1:1 alkaline lipase DENIE-DEGNS-E and the DENIE-DEG NL- produced by the Shanghai bio tech ltd Dan Niyue
L。
The mass ratio of sodium bicarbonate and clear water is 2.5 in step (4):97.5.
The preparation of poloxamer-polyglutamic acid carboxylate：By 10g PLURONICS F87s and the more polyglutamics of 15g water process grades
It is dissolved in water after acid mixing, and dilute sulfuric acid is added dropwise and adjusts solution ph to 4-5, be again heated to reflux state insulated and stirred, react
The lotion of solid content 75-85% is made after end through being concentrated under reduced pressure, lotion is sent into freeze drier after cooled to room temperature
In, micro mist is made to get poloxamer-polyglutamic acid carboxylate through micronizer in dry obtained solid.
Reference examples 1
(1) one sub-high pressure softens：First will natural leather be added autoclave in, start vacuum pump vacuumize make pressure reach-
0.08 to -0.1MPa, then be passed through 50-55 DEG C of temperature, relative humidity 65-75% humid air, protected after pressure reaches 3.5MPa
20min is pressed, is finally restored to normal pressure；
(2) enzyme process degreasing：Leather after pretreatment is impregnated in enzymolysis liquid, enzymolysis liquid adds water to match by alkaline lipase
It makes, 30-40 DEG C of enzymolysis liquid temperature, pH value 7-8, leather is removed into extra enzymolysis liquid through roll-in after enzymolysis, and utilize
Clear water rinses；
(3) secondary high-pressure softens：Leather after enzyme process degreasing is added in autoclave again, starts vacuum pump and vacuumizes
So that pressure is reached -0.08 to -0.1MPa, then is passed through the dry air of 50-55 DEG C of temperature, the pressurize 10min after pressure reaches 5MPa,
Restore to normal pressure, is finally dried at 45-55 DEG C.
The additive amount of step (2) neutral and alkali lipase accounts for the 0.8% of natural leather gross weight, and alkaline lipase selects mass ratio
1:1 alkaline lipase DENIE-DEGNS-E and the DENIE-DEG NL- produced by the Shanghai bio tech ltd Dan Niyue
L。
Reference examples 2
(1) enzyme process degreasing：Natural leather is impregnated in enzymolysis liquid, enzymolysis liquid adds water to be formulated by alkaline lipase,
Leather is removed extra enzymolysis liquid through roll-in after enzymolysis, and is rushed using clear water by 30-40 DEG C of enzymolysis liquid temperature, pH value 7-8
It washes；
(2) secondary high-pressure softens：Leather after enzyme process degreasing is added in autoclave again, starts vacuum pump and vacuumizes
So that pressure is reached -0.08 to -0.1MPa, then is passed through the dry air of 50-55 DEG C of temperature, the pressurize 10min after pressure reaches 5MPa,
Finally restore to normal pressure；
(3) it cleans：Leather after secondary high-pressure softens is impregnated in the clear water dissolved with sodium bicarbonate, is taken after 15min
Go out leather, and rinsed using clear water, is finally dried at 45-55 DEG C.
The additive amount of step (1) neutral and alkali lipase accounts for the 0.8% of natural leather gross weight, and alkaline lipase selects mass ratio
1:1 alkaline lipase DENIE-DEGNS-E and the DENIE-DEG NL- produced by the Shanghai bio tech ltd Dan Niyue
L。
The mass ratio of sodium bicarbonate and clear water is 2.5 in step (3):97.5.
Reference examples 3
(1) one sub-high pressure softens：First will natural leather be added autoclave in, start vacuum pump vacuumize make pressure reach-
0.08 to -0.1MPa, then be passed through 50-55 DEG C of temperature, relative humidity 65-75% humid air, protected after pressure reaches 3.5MPa
20min is pressed, is finally restored to normal pressure；
(2) enzyme process degreasing：Leather after pretreatment is impregnated in enzymolysis liquid, enzymolysis liquid adds water to match by alkaline lipase
It makes, 30-40 DEG C of enzymolysis liquid temperature, pH value 7-8, leather is removed into extra enzymolysis liquid through roll-in after enzymolysis, and utilize
Clear water rinses；
(3) it cleans：Leather after enzyme process degreasing is impregnated in dissolved in the clear water of sodium bicarbonate, skin is taken out after 15min
Leather, and rinsed using clear water, finally dried at 45-55 DEG C.
The additive amount of step (2) neutral and alkali lipase accounts for the 0.8% of natural leather gross weight, and alkaline lipase selects mass ratio
1:1 alkaline lipase the DENIE-DEG NS-E and DENIE-DEG produced by the Shanghai bio tech ltd Dan Niyue
NL-L。
The mass ratio of sodium bicarbonate and clear water is 2.5 in step (3):97.5.
Reference examples 4
Enzymolysis liquid in embodiment 1 is replaced with into 4 made degreasing agent of patent CN201610752078.8 embodiments.
Embodiment 3
The reference examples 1 cleaned without step (4), the reference examples 2 softened without step (1) high pressure are set, without step (3)
The reference examples 3 of high pressure softening.
Embodiment 1-2, reference examples 1-4 are utilized respectively to carrying out ungrease treatment with batch equivalent natural Kraft, wherein corresponding step
Rinse dosage in rapid is identical, measures degreasing rate, as shown in table 1.
The degreasing effect of 1 degreasing process of the present invention of table
| Group | Degreasing rate/% |
| Embodiment 1 | 90.3 |
| Embodiment 2 | 93.5 |
| Reference examples 1 | 88.2 |
| Reference examples 2 | 83.1 |
| Reference examples 3 | 75.4 |
| Reference examples 4 | 56.8 |
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (6)
1. a kind of natural leather degreasing process based on enzymatic isolation method, which is characterized in that including operating as follows：
(1) one sub-high pressure softens：First natural leather is added in autoclave, startup vacuum pump, which vacuumizes, makes pressure reach -0.08
To -0.1MPa, then be passed through 50-55 DEG C of temperature, relative humidity 65-75% humid air, the pressurize 15- after pressure reaches 3.5MPa
30min finally restores to normal pressure；
(2) enzyme process degreasing：Leather after pretreatment is impregnated in enzymolysis liquid, enzymolysis liquid by alkaline lipase add water prepare and
At leather is removed extra enzymolysis liquid through roll-in after enzymolysis, and utilizes clear water by 30-40 DEG C of enzymolysis liquid temperature, pH value 7-8
It rinses；
(3) secondary high-pressure softens：Leather after enzyme process degreasing is added in autoclave again, startup vacuum pump, which vacuumizes, makes pressure
Power reaches -0.08 to -0.1MPa, then is passed through the dry air of 50-55 DEG C of temperature, the pressurize 10-15min after pressure reaches 5MPa,
Finally restore to normal pressure；
(4) it cleans：Leather after secondary high-pressure softens is impregnated in the clear water dissolved with sodium bicarbonate, is taken out after 10-15min
Leather, and rinsed using clear water, finally dried at 45-55 DEG C.
2. the natural leather degreasing process according to claim 1 based on enzymatic isolation method, it is characterised in that：The step (2)
The additive amount of neutral and alkali lipase accounts for the 0.5-1% of natural leather gross weight.
3. the natural leather degreasing process according to claim 1 based on enzymatic isolation method, it is characterised in that：The step (4)
The mass ratio of middle sodium bicarbonate and clear water is 1-5:95-100.
4. the natural leather degreasing process according to claim 1 based on enzymatic isolation method, it is characterised in that：The step (2)
Dissolved with poloxamer-polyglutamic acid carboxylate in clear water used when middle clear water rinses, per 50kg clear water dissolving 0.5-2.5kg pools
Luo Shamu-polyglutamic acid carboxylate.
5. the natural leather degreasing process according to claim 4 based on enzymatic isolation method, it is characterised in that：The pool Lip river is husky
Nurse-polyglutamic acid carboxylate is made of PLURONICS F87 and water process grade polyglutamic acid through esterification, preparation method
For：Will PLURONICS F87 and water process grade polyglutamic acid mix after be dissolved in water, and be added dropwise dilute sulfuric acid adjust solution ph to
4-5 is again heated to reflux state insulated and stirred, and the lotion of solid content 75-85%, lotion is made through being concentrated under reduced pressure after reaction
It is sent into freeze drier after cooled to room temperature, micro mist is made to get pool Lip river through micronizer in dry obtained solid
Sha Mu-polyglutamic acid carboxylate.
6. the natural leather degreasing process according to claim 5 based on enzymatic isolation method, it is characterised in that：The poloxamer
188, the mass ratio of water process grade polyglutamic acid is 5-10:10-20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810288780.2A CN108588305A (en) | 2018-04-03 | 2018-04-03 | A kind of natural leather degreasing process based on enzymatic isolation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810288780.2A CN108588305A (en) | 2018-04-03 | 2018-04-03 | A kind of natural leather degreasing process based on enzymatic isolation method |
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| CN108588305A true CN108588305A (en) | 2018-09-28 |
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| CN201810288780.2A Withdrawn CN108588305A (en) | 2018-04-03 | 2018-04-03 | A kind of natural leather degreasing process based on enzymatic isolation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110179830A (en) * | 2019-07-10 | 2019-08-30 | 山东中泰药业有限公司 | A kind of compound degreasing method of fresh animal medicinal material and defatted animal medicinal material |
| CN112048581A (en) * | 2020-09-07 | 2020-12-08 | 江苏伊贝实业股份有限公司 | Composite material for gluing pretreatment of oily leather of boots, preparation and use process |
-
2018
- 2018-04-03 CN CN201810288780.2A patent/CN108588305A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110179830A (en) * | 2019-07-10 | 2019-08-30 | 山东中泰药业有限公司 | A kind of compound degreasing method of fresh animal medicinal material and defatted animal medicinal material |
| CN112048581A (en) * | 2020-09-07 | 2020-12-08 | 江苏伊贝实业股份有限公司 | Composite material for gluing pretreatment of oily leather of boots, preparation and use process |
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Application publication date: 20180928 |
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