CN102071268A - Dry hair-saving unhair treatment method of raw hide - Google Patents
Dry hair-saving unhair treatment method of raw hide Download PDFInfo
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- CN102071268A CN102071268A CN2011100229515A CN201110022951A CN102071268A CN 102071268 A CN102071268 A CN 102071268A CN 2011100229515 A CN2011100229515 A CN 2011100229515A CN 201110022951 A CN201110022951 A CN 201110022951A CN 102071268 A CN102071268 A CN 102071268A
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Abstract
The invention relates to a dry hair-saving unhair treatment method of raw hide. The invention aims to solve the problem that the existing animal leather tanning methods cause large pollution to the environment so as to provide the ash-free, sodium-sulfide-free and clean dry unhair treatment method. The invention is characterized in that by adopting the method, the damages on the animal leather and the pollutions of the tanning process can be greatly reduced; and particularly the technology does not use sodium sulfide, sodium hydrosulfide and lime which cause most serious pollutions at all, thus the discharged wastewater of the technology is easier to treat and the technology can not produce a large amount of lime deposit and residue generated in the traditional technology. Compared with the traditional technology, by adopting the technology of the invention, the environmental pollutions can be greatly reduced, the qualities and yields of various animal leathers can be increased and the byproduct value of enterprise can be increased.
Description
Technical field
The present invention relates to the no lime of animal skin in a kind of process hides, the dry method guarantor hair depilation treatment process of alkali sulfide free, belong to leather manufacturing technology field.This method is applicable to lamb skin, the goatskin of demand on the current market, the processing of yak skin, also is fit to the recovery of other high-quality animal skins.Guarantee that no sulfide, no lime or low mud pollutent are discharged to environment.
Technical background
At present, most tanneries uses the depilation of Sodium Sulphide lime coating dry method, and only a few adopts the sulfide depilation in the aqueous solution.Its advantage is that expense is low, quick, depilation is clean, guarantees the leather products quality, can adapt to the production of various leathers.Problem be the aqueous solution pH of sulfide greater than 14, can dissolve Keratin sulfate fast, therefore can lose hair or feathers rapidly after the coating, but a large amount of sulfide sticks on hair root and the hair and causes mao matter to descend.Secondly, the coating of sulfide and lime depilation shortcoming is that material usage is big, COD in the waste liquid (chemical oxygen demand (COD)), BOD (biological oxygen demand), TSS (total suspended solids) and S
2-(sulfide) content is very high, and the waste liquid post precipitation produces a lot of mud, and difficult treatment is brought serious pollution to environment.The mountain is high and to the toxic action of organic sphere in Sodium Sulphide content, and the hydrogen sulfide that causes raffinate that the sodium sulphite epilation process produces and volatilization to enter air damages for people and equipment and corrodes.When being coated with grey alkali, dry method must stop the trickling of depilatory solution with large quantities of lime.Lime and calcium salt have increased mud amount, thereby have increased transport charge preliminary and the second step mud.A large amount of lime consumptions has also increased liming and has washed the difficulty of protein recovery in the graywall body lotion.People are more and more higher to the attention degree of environment now, recognize that also environment protection is more and more important, and in the face of the harm of traditional ash alkali unhairing technology to environment, process hides person attempts to find a kind of nonpolluting method to replace traditional dehairing process.
Compare with traditional sulfide and lime coating dehairing process, this technology cortex loss is less, the leather products steady quality, and no mud, a small amount of discharge of wastewater, cost for wastewater treatment reduces.
Summary of the invention
The present invention seeks to a large amount of pollutions that environment caused at existing animal skin method for leather-making and ashless, the alkali sulfide free that provides cleans the dry method depilation and handle.Its characteristics are that this method can reduce the damage of animal wool significantly, pollution in the process hides process, especially do not use fully in this technology and be considered to pollute maximum sodium sulphite, Sodium sulfhydrate and lime, large quantities of lime throw out and residue in the traditional technology can not appear in the easier processing of waste water that this technology is discharged.
Purpose of the present invention is realized that by following measure the umber of wherein said each raw material is parts by weight except that specified otherwise.Ashless, the alkali sulfide free depilation liming treatment method of rawhide process hides:
(1) immersion
Get 1000 parts of rawhides, go into drum, in rotary drum, add 3000～4000 parts 25～30 ℃ water, 4～6 parts of penetrating agent JFCs, 4～5 parts of soda ash, 1～1.5 part of sterilant, 4～6 parts of grease-removing agents changeed 15 minutes, stopped 15 minutes, totally 4 times, add 4～5 parts of soda ash, changeed 15 minutes, stopped 15 minutes, and totally 4 times, changeed 5 minutes in later per 2 hours, immersion skin body bone softness totally 20～24 hours, is checked in control pH9.2～9.5, the all saturating heart of otch goes out drum, fleshing.
(2) pre-treatment
The water that in rotary drum, adds 1000～1500 parts 25～30 ℃, 50～80 parts of pretreating agents changeed 20 minutes, stopped 20 minutes, totally 4 times, changeed 3 minutes in later per 2 hours, totally 12～18 hours, pH8.0～10.0 control water.
Add 500～700 parts of 25～30 ℃ of water in rotary drum, add 30～60 parts of ammonium sulfate, 40～60 parts of grease-removing agents changeed 60 minutes, behind accent pH8.0～8.5, went out drum, control water.
(3) be coated with the depilatory paste depilation
The depilatory paste for preparing is coated in the skin and flesh face, and flesh noodles pushes away hair after flesh noodles is stacked 4 hours.
(4) expansion process
The water that in rotary drum, adds 800～1000 parts 22～25 ℃, 10～20 parts of depilatory pastes, 4～6 parts of grease-removing agents, rotated 30 minutes, and divided to add 18～24 parts of sodium hydroxide three times, add at every turn and rotated 30 minutes, stopped 30 minutes, changeed 5 minutes in per 2 hours later on, totally 16～24 hours, remaining hair and epidermis were clear clean, go out drum, fleshing, split enters the back operation.
The present invention has following advantage:
The present invention is not considered to pollute maximum sodium sulphite, Sodium sulfhydrate and lime because of not using fully, so can reduce the pollution in the process hides process significantly, large quantities of lime throw out and residue in the traditional technology can not appear in the easier processing of waste water that this technology is discharged.The advantage of this method is to reduce significantly the damage of animal wool simultaneously.
Specific embodiments
Below by embodiment the present invention is carried out concrete description; be necessary to be pointed out that at this following examples only are 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 make some nonessential improvement and adjustment to the present invention according to the content of foregoing invention.
Embodiment 1: lamb skin clothing leather production technique
(1) immersion
Get the rawhide double centner, go into drum, in rotary drum, add 400 kilograms 30 ℃ water, 0.5 kilogram of penetrating agent JFC, 0.5 kilogram soda ash, 0.1 kilogram of sterilant, 0.4 kilogram of grease-removing agent changeed 15 minutes, stopped 15 minutes, totally 4 times, add 0.5 kilogram of soda ash, changeed 15 minutes, stopped 15 minutes, and totally 4 times, changeed 5 minutes in later per 2 hours, immersion skin body bone softness totally 24 hours, is checked in control pH9.2～9.5, the all saturating heart of otch goes out drum, fleshing.
(2) pre-treatment
Add the water of 30 ℃ of double centners in rotary drum, 0.8 kilogram of pretreating agent changeed 20 minutes, stopped 20 minutes, and totally 4 times, changeed 3 minutes in later per 2 hours, totally 18 hours, control water.
Add 60 kilograms of 30 ℃ of water in rotary drum, add 0.6 kilo sulfuric acid ammonium, 0.6 kilogram of grease-removing agent changeed 60 minutes, behind accent pH8.0～8.5, went out drum, control water.
(3) be coated with the depilatory paste depilation
The depilatory paste for preparing is sprayed on the skin and flesh face, and flesh noodles pushes away hair after flesh noodles is stacked 4 hours.
(4) expand
The water that in rotary drum, adds 80 kilograms 25 ℃, 1.5 kilograms of pretreating agents rotated 30 minutes, divide and add 2.4 kg of hydrogen sodium oxides three times, add at every turn and rotated 30 minutes, stopped 30 minutes, changeed 5 minutes in later per 2 hours, totally 24 hours, go out drum, fleshing, split, weigh 110 kilograms, later operative material consumption is by this weight.Embodiment 2: the technology of yak depilation
(1) immersion
Get the rawhide double centner, go into drum, in rotary drum, add 350 kilograms 30 ℃ water, 0.4 the kilogram penetrating agent JFC, 0.5 kilogram of soda ash, 0.1 kilogram of sterilant, 0.5 the kilogram grease-removing agent changeed 15 minutes, stopped 15 minutes, totally 4 times, add 0.4 kilogram of soda ash, changeed 15 minutes, stopped 15 minutes, totally 4 times, changeed 5 minutes control pH9.2～9 in later per 2 hours.5, totally 20 hours, check immersion skin body bone softness, all saturating heart of otch goes out drum, fleshing.
(2) pre-treatment
Add the water of 30 ℃ of double centners in rotary drum, 0.6 kilogram of pretreating agent changeed 20 minutes, stopped 20 minutes, and totally 4 times, changeed 3 minutes in later per 2 hours, totally 16 hours, control water.
Add 60 kilograms of 30 ℃ of water in rotary drum, add 0.5 kilo sulfuric acid ammonium, 0.5 kilogram of grease-removing agent changeed 60 minutes, behind accent pH8.0～8.5, went out drum, control water.
(3) be coated with the depilatory paste depilation
The depilatory paste for preparing is sprayed on the skin and flesh face, and flesh noodles pushes away hair after flesh noodles is stacked 4 hours.
(4) expand
The water that in rotary drum, adds 25 ℃ of double centners, 1.0 kilograms of pretreating agents, 0.5 kilogram of grease-removing agent, rotated 30 minutes, and divided to add 2.4 kg of hydrogen sodium oxides three times, add at every turn and rotated 30 minutes, stopped 30 minutes, changeed 5 minutes, and totally 24 hours, went out drum in per 2 hours later on, fleshing, split is weighed, and later operative material consumption is by this weight.
Embodiment 3: goat shoe upper leather technology
(1) immersion
Get the rawhide double centner, go into drum, in rotary drum, add 350 kilograms 25 ℃ water, 0.5 kilogram of penetrating agent JFC, 0.5 kilogram soda ash, 0.15 kilogram of sterilant, 0.45 kilogram of grease-removing agent changeed 15 minutes, stopped 15 minutes, and totally 4 times, added 0.5 kilogram of soda ash, changeed 15 minutes, stopped 15 minutes, totally 4 times, changeed 5 minutes control pH9.2～9.5, totally 20 hours in per 2 hours later on, check immersion skin body bone softness, all saturating heart of otch, control water.
(2) pre-treatment
Add the water of 25 ℃ of double centners in rotary drum, 0.5 kilogram of pretreating agent changeed 20 minutes, stopped 20 minutes, and totally 4 times, changeed 3 minutes in later per 2 hours, totally 12 hours, control water.
Add 70 kilograms of 25 ℃ of water in rotary drum, add 4 kilo sulfuric acid ammoniums, 5 kilograms of grease-removing agents changeed 60 minutes, behind accent pH8.0～8.5, went out drum, control water.
(3) spray depilatory paste depilation
The depilatory paste for preparing is sprayed on the skin and flesh face, and flesh noodles pushes away hair after flesh noodles is stacked 4 hours.
(4) expand
The water that in rotary drum, adds 25 ℃ of double centners, 2.0 kilograms of pretreating agents, 0.5 kilogram of grease-removing agent, rotated 20～30 minutes, and divided to add 1.8 kg of hydrogen sodium oxides three times, add at every turn and rotated 30 minutes, stopped 30 minutes, the control pH value of solution is 12.0～13.0, changes 5 minutes in later per 2 hours, totally 18 hours, go out drum, fleshing, split, weigh, later operative material consumption is by this weight.
Claims (3)
1. the dry method of a rawhide is protected hair depilation treatment process, it is characterized in that this method contains following steps (wherein said each raw material is according to the weight part meter):
(1) immersion
Get 1000 parts of rawhides, go into drum, in rotary drum, add 3000～4000 parts 25～30 ℃ water, 4～6 parts of penetrating agent JFCs, 4～5 parts of soda ash, 1～1.5 part of sterilant, 4～6 parts of grease-removing agents changeed 15 minutes, stopped 15 minutes, totally 4 times, add 4～5 parts of soda ash, changeed 15 minutes, stopped 15 minutes, and totally 4 times, changeed 5 minutes in later per 2 hours, immersion skin body bone softness totally 20～24 hours, is checked in control pH9.2～9.5, the all saturating heart of otch goes out drum, fleshing;
(2) pre-treatment
The water that in rotary drum, adds 1000～1500 parts 25～30 ℃, 50～80 parts of pretreating agents changeed 20 minutes, stopped 20 minutes, totally 4 times, changeed 3 minutes in later per 2 hours, totally 12～18 hours, pH8.0～10.0 control water;
Add 500～700 parts of 25～30 ℃ of water in rotary drum, add 30～60 parts of ammonium sulfate, 40～60 parts of grease-removing agents changeed 60 minutes, behind accent pH8.0～8.5, went out drum, control water;
(3) be coated with the depilatory paste depilation
The depilatory paste for preparing is sprayed on the skin and flesh face, and flesh noodles pushes away hair after flesh noodles is stacked 4 hours;
(4) expand
The water that in rotary drum, adds 800～1000 parts 22～25 ℃, 10～20 parts of pretreating agents, 4～6 parts of grease-removing agents, rotated 30 minutes, and divided to add 18～24 parts of sodium hydroxide three times, add at every turn and rotated 30 minutes, stopped 30 minutes, changeed 5 minutes, and totally 16～24 hours, went out drum in per 2 hours later on, fleshing, split is weighed, and later operative material consumption is by this weight.
2. the depilation treatment process of rawhide according to claim 1 is characterized in that before being coated with the depilatory paste depilation skin being carried out pre-treatment, makes materials with hide glue fibril loose a little, and hair root becomes flexible, and helps the rapid osmotic of trichogen, the carrying out rapidly of depilation; Wherein pretreating agent adopts following the composition:
8～10 parts of paregal Os
10～20 parts of 2709 alkaline enzymes
10～20 parts in urea
30～40 parts of hydramine
20～30 parts of soda ash.
3. be coated with depilatory paste according to claim 1, it is characterized in that forming by following chemical:
8～10 parts of quadrols
10～15 parts of thionamic acids
20～30 parts of mercaptoethanols
10～20 parts of hydramine (second, diethyl, the equal five equilibrium of trolamine mix)
Bubble flower alkali (modulus 3.0) 20～35 parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011100229515A CN102071268A (en) | 2011-01-12 | 2011-01-12 | Dry hair-saving unhair treatment method of raw hide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100229515A CN102071268A (en) | 2011-01-12 | 2011-01-12 | Dry hair-saving unhair treatment method of raw hide |
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| CN102071268A true CN102071268A (en) | 2011-05-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102952907A (en) * | 2011-08-26 | 2013-03-06 | 约泰实业股份有限公司 | Method for depilating animal skin |
| CN103320550A (en) * | 2013-06-19 | 2013-09-25 | 海宁瑞星皮革有限公司 | Hair-saving and hair removing tanning method by adopting micro enzyme-alkaline process |
| JP2020193332A (en) * | 2019-05-21 | 2020-12-03 | 和弥 高瀬 | Method for depilating animal hide |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304455A (en) * | 1999-07-20 | 2001-07-18 | 特朗普勒化学纤维两合公司 | Auxiliary for liming and loosening hairs of animal skins |
| KR20020015712A (en) * | 2002-01-11 | 2002-02-28 | 주식회사 한울림 | The drum-leather manufacturing method |
| CN101235421A (en) * | 2008-02-02 | 2008-08-06 | 四川大学 | Animal fur clean depilation and fur fiber loosing method for preparing leather and application thereof |
| CN101265505A (en) * | 2008-05-08 | 2008-09-17 | 四川大学 | Ashless and alkali sulfide free depilation liming treatment method for preparing leather from raw sheep skin |
-
2011
- 2011-01-12 CN CN2011100229515A patent/CN102071268A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304455A (en) * | 1999-07-20 | 2001-07-18 | 特朗普勒化学纤维两合公司 | Auxiliary for liming and loosening hairs of animal skins |
| KR20020015712A (en) * | 2002-01-11 | 2002-02-28 | 주식회사 한울림 | The drum-leather manufacturing method |
| CN101235421A (en) * | 2008-02-02 | 2008-08-06 | 四川大学 | Animal fur clean depilation and fur fiber loosing method for preparing leather and application thereof |
| CN101265505A (en) * | 2008-05-08 | 2008-09-17 | 四川大学 | Ashless and alkali sulfide free depilation liming treatment method for preparing leather from raw sheep skin |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102952907A (en) * | 2011-08-26 | 2013-03-06 | 约泰实业股份有限公司 | Method for depilating animal skin |
| CN102952907B (en) * | 2011-08-26 | 2015-05-13 | 约泰实业股份有限公司 | Method for depilating animal skin |
| CN103320550A (en) * | 2013-06-19 | 2013-09-25 | 海宁瑞星皮革有限公司 | Hair-saving and hair removing tanning method by adopting micro enzyme-alkaline process |
| CN103320550B (en) * | 2013-06-19 | 2015-11-18 | 海宁瑞星皮革有限公司 | A kind of micro-enzyme alkaline process protects the method for leather-making of hair depilation |
| JP2020193332A (en) * | 2019-05-21 | 2020-12-03 | 和弥 高瀬 | Method for depilating animal hide |
| JP7304017B2 (en) | 2019-05-21 | 2023-07-06 | 東京都 | animal skin removal method |
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Application publication date: 20110525 |