CN1215771C - Depilating composition for less thiolase process and the water bath depilation method therewith - Google Patents
Depilating composition for less thiolase process and the water bath depilation method therewith Download PDFInfo
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- CN1215771C CN1215771C CN 03135883 CN03135883A CN1215771C CN 1215771 C CN1215771 C CN 1215771C CN 03135883 CN03135883 CN 03135883 CN 03135883 A CN03135883 A CN 03135883A CN 1215771 C CN1215771 C CN 1215771C
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Abstract
The present invention relates to a depilating composition for less thiolase process and a water bath depilating method thereof, which is characterized in that 100 shares of leather blanks which are completely soaked, fleshed, and defatted are added in a rotating drum; 100 to 300 shares of water are added in the rotating drum, and the temperature of the water is from 34 to 38 DEG C; 0.1 to 1.0 share of surface active agents and 0.5 to 2.5 shares of sodium bicarbonate are added in the rotating drum and are rotated for 30 minutes; 0.2 to 1.5 shares of ammonium chloride are added in the rotating drum and are rotated for 30 minutes; 0.1 to 0.8 share of proteolytic enzyme is added in the rotating drum and is rotated for 60 to 120 minutes; 0.1 to 0.8 share of sodium sulfide is added in the rotating drum and is rotated for 60 minutes; 1.5 to 5.0 shares of calcium oxide are added in the rotating drum and are rotated for 60 minutes, and the rotating drum is stopped for 60 minutes; 0 to 1.0 share of hydrogen peroxide is added in the rotating drum and is rotated for 30 minutes, and then, rotation and stop are combined, the rotating drum is rotated for 5 to 10 minutes per hour and is rotated for 5 times, the rotating drum is stopped overnight for total time of 15 to 24 hours, and the leather blanks are depilated with water bath method. The present invention has the advantages that the depilating effect is good, and fibre can be further dispersed to ensure that finished leather is soft, the colors of the leather blanks are light, the pollution of sulphides is reduced, and the content of COD and BOD5 in depilating waste water is reduced. The present invention is a good clean production technology in leather industry and has obvious economic and social benefits.
Description
One, technical field
The present invention relates to a kind of few sulphur enzymatic depilation composition and depilation method in water bath thereof, belong to the process hides field of engineering technology.
Two, background technology
The depilation of animal skins such as traditional sheepskin, ox-hide and pigskin mainly is to adopt the sulfuration alkaline process, and sheepskin is the flesh noodles that is applied to skin with furnishing pasty states such as akali sulphide and lime, behind the certain hour of banking up, pushes away hair by hand; Ox-hide, pigskin etc. then are to ruin hair with akali sulphide and lime in water-bath in rotary drum.Therefore all there is serious pollution problem, comprises sulfide, lime, and a large amount of COD, the BOD of hair dissolving back generation
5And SS.
Tannery generally adopts traditional grey alkaline process depilation at present, and this method hair removal effect is good, steady quality, and technical maturity, but can produce degradation products such as a large amount of sulfide, hair and epidermis, serious environment pollution.And enzymatic depilation is a kind of cleaning procedure of generally acknowledging, still, the protease quality instability that traditional handicraft adopts, purity is low in addition, selectivity is poor, and enzyme is that component is many, and effect is complicated, therefore easily produce the unclean or mashed face of depilation, loose side in producing, problems such as pore expansion, operation control difficulty is big.
It is few auxiliary enzyme process to be protected mao research of depilation both at home and abroad, and auxiliary hair remover is generally used vulcanized sodium.People such as E.BerlaThangam cultivate a kind of alkali protease, and it is cooperated the depilation that is used for goat skin with vulcanized sodium, find after the vulcanized sodium of 0.5% this kind of enzyme and 1% is used 20 hours, wool can be taken off (E.Berla Thangam at an easy rate, T.Nagarajan, G.Suseela Rajkumar.Application of alkaline protease isolated fromalcaligenes faecalis for enzymatic unhairing in tanneries.JALCA, 2001,96:127～132).But this alkali protease is difficult to obtain, and the consumption of vulcanized sodium is also higher, is difficult to realize large-scale production.People such as Wang Jiangen have studied few vulcanized sodium depilation enzyme normal temperature immersion depilation and the depilation of vulcanized sodium soaking enzyme, under suitable phenols promoter effect, ox-hide is lost hair or feathers with 1398 enzymes, obtained comparatively desirable hair removal effect, the every physics sense index of finished leather has also all reached ministry standard.Wherein, 1398 enzyme dosages are greater than 0.4%, and amount of sodium sulfide is 0.5% (Wang Jiangen, Zhang Zhongyu, Chen Chaoying etc.The research of few vulcanized sodium enzymatic depilation technology." Chinese leather ", 2001,30 (5): 29～32), this method operation is more loaded down with trivial details, and the consumption of vulcanized sodium is also higher, but also has brought the pollution of aldehydes matter, and the hair of taking off is difficult to recycle.
Chinese patent 90101445.1 " thoroughly solving the grey enzyme unhairing new technology of sulphur pollution ", 88103066.X " depilation technology using triisopropanolamine " and 85102770 " technology of de-hairing with triethanolamine " all are to replace sulfide depilation with other chemical substance, be to utilize protease under the lime effect, to lose hair or feathers in first part of patent only to replace sulfide fully, solve the pollution problem of sulphur, but exist technique controlling difficulty big, be prone to depilation not to the utmost or mashed face phenomenon.All be to use organic amine to replace sulfide to lose hair or feathers in the two parts of patents in back, but have the pollution problem of organic amine, even toxicity problem.Do not see the patent report of relevant few sulphur auxiliary enzymes depilation technical elements.
Three, summary of the invention
The objective of the invention is at the deficiencies in the prior art, and a kind of less thiolase process Depilatory composition and depilation method in water bath thereof are provided, be characterized in, in rotary drum, lose hair or feathers by the water-bath mode to animal skins such as pig, oxen.And the booster action by sulfide, improve the protease hair removal effect.The present invention has alleviated traditional ash alkali unhairing technology produced pollution greatly, obtains gratifying hair removal effect.
Purpose of the present invention is realized that by following technical measures wherein said raw material umber is parts by weight except that specified otherwise.
The recipe ingredient of less thiolase process Depilatory composition is:
100 parts of skin bases
Protease is by 50000u/g unit of activity 0.1-0.8 part
Akali sulphide 0.1-0.8 part
Ammonium chloride 0.2-1.5 part
Sodium acid carbonate 0.5-2.5 part
Lime 1.5-5 part
Surfactant 0.1-1.0 part
Water 100-300 part
Wherein akali sulphide is Na
2S or NaHS;
Protease preparation is at least a in 1398 protease, 166 protease and/or the NOMOLASE PE enzyme;
Surfactant is non-ionic surface active agent C
12-C
18AEO, C
8-C
12At least a in APES, neopelex and/or the lauryl sodium sulfate.
Depilating method:
With 100 parts of the skin bases after immersion fully, fleshing, the degreasing, add in the rotary drum, add water yield 100-300 part, 34-38 ℃ of control water temperature, add surfactant 0.1-1.0 part and sodium acid carbonate 0.5-2.5 part earlier, rotated 30 minutes, adding ammonium chloride 0.2-1.5 part again changeed 30 minutes; Adding proteinase-10 .1-0.8 part rotated 60 minutes; Adding akali sulphide 0.1-0.8 part rotated 60 minutes; Add lime 1.5-5 part and rotated about 60 minutes, stopped 60 minutes, change later on and stop combination, per hour changeed 5-10 minute, moving 5 times of corotation stops drum and spends the night, and loses hair or feathers total time 15-22 hour.
In order to obtain better effect and to reduce S in the depilation waste liquor significantly
=Concentration, suggestion adds 0.2-1 part hydrogen peroxide in the depilation later stage, to promote the dispersion of fiber, makes the pelt pigment light, simultaneously with the S in the water-bath
=Be oxidized to sulfate.In the practical operation if use perforate bowl the best, so that, prevent balling during the course with the hair filtering of being taken off.
The present invention and conventional grey alkaline process are ruined a mao dehairing process and relatively found: few sulfide auxiliary enzymes depilation has not only improved the enzymatic depilation effect, and the further loosen collagen fibre of energy, make finished leather softness, plentiful, skin base color is more light, and the finished leather physical and mechanical properties does not have significant change.S in the depilation waste liquor
=Reduce more than 80% COD and BOD
5Reduce more than 75%.
The present invention has the following advantages:
Few sulphur enzymatic depilation method that the present invention adopts not only can reduce sulphide staining, reduces COD and BOD in the waste water
5, reduce the pollution abatement costs of tannery, and hair removal effect and resultant leather quality are all satisfactory, are a kind of production technologies that cleans that suits leather industry reality.This method can also obtain the animal wool accessory substance of better quality, and remarkable economic efficiency and social benefit are arranged.
Four, the specific embodiment
Below by embodiment the present invention is specifically described; be necessary to be pointed out that at this present embodiment only is used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field can do some nonessential improvement and adjustment according to the content of the invention described above.
Embodiment 1: the pigskin depilation
The pigskin base 100kg that will wait to lose hair or feathers adds in the rotary drum, and the adding water temperature is 36-38 ℃ water 160kg, adds sodium acid carbonate 2kg and C
12-C
18AEO 0.5kg rotated 30 minutes, added NH
4Cl 1.3kg rotated 30 minutes, added 1398 proteinase-10 .4kg, and temperature control rotated 60 minutes at 34-38 ℃, added Na
2S0.3kg rotated 60 minutes, added lime 3kg and rotated 60 minutes, stopped 60 minutes, added H
2O
20.2kg rotated 30 minutes, change later on and stop combination, per hour changeed 5 minutes, moving 5 times of corotation stops drum and spends the night total time 20-24 hour.
Before adding vulcanized sodium, the ball top in the rotary drum is removed, the one, the consumption of reduction sulfide also avoids hair to dissolve COD, the BOD of the high-load that brings simultaneously
5
Depilation is complete, the cleaning of skin base, softness.
Embodiment 2: the pigskin depilation
The pigskin base 100kg that will wait to lose hair or feathers drops in the rotary drum, and the adding water temperature is 36-38 ℃ water 200kg, adds C
8-C
12APES 0.6kg and sodium acid carbonate 1kg rotated 30 minutes, added NH
4Cl 1.2kg rotated 30 minutes, added 166 proteinase-10 .5kg and NaHS 0.5kg, and interior temperature control 34-38 ℃ of control drum rotated 60 minutes, add lime 3kg and rotated 60 minutes, stopped 60 minutes, change later on and stop combination, per hour changeed 5 minutes, moving 5 times of corotation stops drum and spends the night total time 18-22 hour.
Before adding NaHS, from rotary drum, remove ball top.
Depilation is complete, and the skin base is canescence, softness.
Embodiment 3: the goat skin depilation
The goat skin base 100kg that will wait to lose hair or feathers behind immersion, fleshing drops in the rotary drum, and the adding water temperature is 36-38 ℃ water 200kg, adds C
12-C
18AEO 0.2kg, neopelex 0.3kg and sodium acid carbonate 2kg changeed 30 minutes, adding ammonium chloride 0.8kg rotated 30 minutes, add 1398 enzyme 0.5kg and NaHS 0.35kg and rotate 100 minutes (about 36 ℃ of control temperature), add lime 3kg and rotated 60 minutes, add H
2O
20.6kg rotated 30 minutes, change later on and stop combination, per hour changeed 5 minutes, moving 5 times of corotation stops drum and spends the night total time 18-22 hour.
Enzyme-added effect back hair comes off in a large number and is rolled into ball top, so should remove ball top before adding NaHS in advance.Depilation back surface color is white in color, cleaning.Should notice that temperature is no more than 40 ℃ in the drum after adding lime.
Claims (4)
1, less thiolase process Depilatory composition is characterized in that said composition mainly made by the raw material of following weight portion:
100 parts of skin bases
Protease is by 50000u/g unit of activity 0.1-0.8 part
Akali sulphide 0.1-0.8 part
Ammonium chloride 0.2-1.5 part
Sodium acid carbonate 0.5-2.5 part
Lime 1.5-5.0 part
Surfactant 0.1-1.0 part
Water 100-300 part
Wherein akali sulphide is Na
2S or NaHS.
2,, it is characterized in that protease is at least a in 1398 protease, 166 protease and/or the NOMOLASE PE enzyme according to the described less thiolase process Depilatory composition of claim 1.
3,, it is characterized in that surfactant is at least a in non-ionic surface active agent C12-C18 AEO, C8-C12 APES, anionic face activating agent neopelex and/or the lauryl sodium sulfate according to claim 1 or 2 described less thiolase process Depilatory compositions.
4, according to the depilation method in water bath of the described less thiolase process Depilatory composition of one of claim 1～3, it is characterized in that:
To soak fully, fleshing, 100 parts of skin bases after the degreasing add in the rotary drum, add water 100-300 part, water temperature is 34-38 ℃, adds surfactant 0.1-1.0 part and sodium acid carbonate 0.5-2.5 part, rotates 30 minutes, add ammonium chloride 0.2-1.5 part, rotated 30 minutes, add proteinase-10 .1-0.8 part, rotated 60 minutes, add akali sulphide 0.1-0.8 part, rotated 60 minutes, add lime 1.5-5.0 part, rotated 60 minutes, stopped 60 minutes, and added hydrogen peroxidase 10-1.0 part, rotated 30 minutes, change later on and stop combination, per hour rotated 5-10 minute, moving 5 times of corotation stops drum and spends the night, total time 15-24 hour, promptly finish the depilation of skin base immersion method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03135883 CN1215771C (en) | 2003-09-24 | 2003-09-24 | Depilating composition for less thiolase process and the water bath depilation method therewith |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03135883 CN1215771C (en) | 2003-09-24 | 2003-09-24 | Depilating composition for less thiolase process and the water bath depilation method therewith |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1526289A CN1526289A (en) | 2004-09-08 |
| CN1215771C true CN1215771C (en) | 2005-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03135883 Expired - Fee Related CN1215771C (en) | 2003-09-24 | 2003-09-24 | Depilating composition for less thiolase process and the water bath depilation method therewith |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343172B (en) * | 2013-07-19 | 2015-04-08 | 四川大学 | Method for removing crocodile skin scales by low-sulfur enzyme method |
| CN113207938B (en) * | 2021-05-06 | 2022-07-22 | 江苏省农业科学院 | Secondary unhairing method in waterfowl slaughtering processing |
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2003
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