CN113373270B - Enzyme depilation grain surface protective agent and raw material skin depilation method - Google Patents
Enzyme depilation grain surface protective agent and raw material skin depilation method Download PDFInfo
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- CN113373270B CN113373270B CN202110668327.6A CN202110668327A CN113373270B CN 113373270 B CN113373270 B CN 113373270B CN 202110668327 A CN202110668327 A CN 202110668327A CN 113373270 B CN113373270 B CN 113373270B
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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
- C14C1/06—Facilitating unhairing, e.g. by painting, by liming
- C14C1/065—Enzymatic unhairing
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
- C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
- C07D487/04—Ortho-condensed systems
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Abstract
The invention provides an enzyme depilatory grain surface protective agent and a raw material skin depilatory method, wherein the enzyme depilatory grain surface protective agent is prepared by the following method: adding a dialdehyde compound, an amino compound and water into a reaction kettle according to a certain proportion, controlling the temperature at 30-35 ℃, stirring until the dialdehyde compound, the amino compound and the water are completely dissolved, dropwise adding a sodium hydroxide solution, controlling the pH at 5.0-9.0, heating to 50-80 ℃, and reacting at a constant temperature for 6-10 hours; after the reaction is finished, cooling, adding formic acid to adjust the pH value to 2.5-3.5, and obtaining the enzyme depilatory grain surface protective agent. The enzyme depilatory grain surface protective agent prepared by the invention can slightly tanning and protecting the leather grain surface, can avoid the action of protease on the leather grain surface for a long time in the enzyme depilatory process, protect the grain surface, improve the leather quality, is convenient to operate, facilitates the popularization of a clean enzyme depilatory technology, and improves the cleaning level of the leather-making depilatory production process.
Description
Technical Field
The invention relates to the technical field of leather making, in particular to an enzyme unhairing grain surface protective agent and a raw material leather unhairing method applied to the technical field of leather clean production.
Background
The processing process of the real leather is very complex, and dozens of working procedures are needed for preparing the finished leather from the raw leather: hide-soaking-fleshing-degreasing-unhairing-alkali-soaking-swelling-deliming-softening-pickling-tanning-splitting-shaving-retanning-neutralizing-dyeing-oiling-filling-drying-finishing-coating-finished leather. Among them, depilation is an important process in leather making, which aims to remove hairs and skins, expose natural grains of the skin and give the leather a smooth and beautiful surface.
Currently available methods of depilation include the following: 1. the grey alkali hair-destroying unhairing process is one unhairing process with sodium sulfide as reductant and alkali to act on the disulfide bond between hair and skin to dissolve hair and skin and expand skin. However, this method uses a large amount of sodium sulfide and produces a large amount of wool and skin hydrolysates, which causes serious environmental pollution (COD, suspended solids, etc.). 2. The traditional enzymatic unhairing method is realized by acting single protease on animal raw leather for a long time to destroy the relation between a hair bag and a hair shaft, so that hair roots are loosened, and the aim of unhairing is fulfilled. 3. The compound enzyme unhairing method adopts the compound enzyme to unhair, can weaken the loss of single protease to skin collagen, but has excessive effect on the surface of skin grains after a long time, only has little damage degree relative to the single protease, but still has the defects of leather forming, loose surface and the like. The prior art also adopts the following method for protection: under the action of a compound enzyme depilatory, soaking the soaked raw leather for depilation, and taking out to obtain a depilatory semi-finished product; then spraying protein inhibition protective solution on the surface of the unhairing semi-finished product obtained in the step, standing and then pushing hair to obtain unhaired raw material skin; but its operation is relatively complex, time-consuming and labor-intensive. Therefore, it is highly desirable to provide a grain surface protective agent suitable for enzyme depilation to avoid the defects of loose leather surface, damage to grain surface and the like caused by long-term action of protease in the enzyme depilation process.
Disclosure of Invention
The invention aims to provide an enzyme depilatory grain surface protective agent and a raw material leather depilatory method. The technical effects that can be produced by the preferred technical scheme of the technical schemes provided by the invention are described in detail in the following.
In order to realize the purpose, the invention provides the following technical scheme:
the invention provides an enzyme depilatory grain surface protective agent, which is prepared by the following method: adding a dialdehyde compound, an amino compound and water into a reaction kettle according to a certain proportion, controlling the temperature at 30-35 ℃, stirring until the dialdehyde compound, the amino compound and the water are completely dissolved, dropwise adding a sodium hydroxide solution, controlling the pH value at 5.0-9.0, heating to 50-80 ℃, and reacting at a constant temperature for 6-10 hours; after the reaction is finished, cooling, adding formic acid to adjust the pH value to 2.5-3.5, and obtaining the enzyme depilatory grain surface protective agent.
According to a preferred embodiment, the dialdehyde compound is a dialdehyde compound with a carbon chain of 2-8C.
According to a preferred embodiment, the dialdehyde compound is one or more of glyoxal, malondialdehyde, succindialdehyde and glutaraldehyde.
According to a preferred embodiment, the amino compound is one or more of urea, glycine, lysine and melamine.
According to a preferred embodiment, the dialdehyde compound is used in an amount of 1 to 4 parts and the amino compound is used in an amount of 1 to 3 parts.
The invention also provides a raw skin unhairing method, which comprises the following steps: and adding an animal skin complex enzyme depilatory into the raw leather subjected to the main water immersion treatment, and adding an enzyme depilatory grain surface protective agent into the bath liquid to slightly tanning and fix the grain surface collagen fibers when the hair roots at the edge part are loosened after rotating for a certain time until the depilation is finished.
According to a preferred embodiment, further comprising: adding 80% of water, 0.2% of FG-E surfactant and animal skin complex enzyme depilatory into a rotary drum of the raw leather subjected to main soaking treatment, rotating at low speed for 30 minutes, stopping for 30 minutes, checking the looseness of hair roots at the edge part after 2 times, immediately adding an enzyme depilatory grain surface protective agent, slightly tanning and fixing grain surface collagen fibers, continuously rotating at low speed until most of hairs are completely removed, and adding an ashless expanding agent for alkali expansion until the depilation is finished.
According to a preferred embodiment, the enzymatic depilatory grain surface protective agent is prepared by a process comprising: adding a dialdehyde compound, an amino compound and water into a reaction kettle according to a certain proportion, controlling the temperature at 30-35 ℃, stirring until the dialdehyde compound, the amino compound and the water are completely dissolved, dropwise adding a sodium hydroxide solution, controlling the pH at 5.0-9.0, heating to 50-80 ℃, and reacting at a constant temperature for 6-10 hours; and cooling after the reaction is finished, adding formic acid to adjust the pH value to 2.5-3.5, discharging and packaging to obtain the enzyme depilatory grain surface protective agent.
According to a preferred embodiment, the dialdehyde compound is one or more of glyoxal, malondialdehyde, succindialdehyde and glutaraldehyde; the amino compound is one or more of urea, glycine, lysine and melamine.
According to a preferred embodiment, the animal skin compound enzyme depilatory is prepared from the following components:
5-20 parts of neutral protease or alkaline protease, 0-10 parts of elastase, 0.5-15 parts of lipase, 0-10 parts of enzyme penetration enhancer, 0-50 parts of pH regulator and 0-95 parts of diluent.
Based on the technical scheme, the enzyme depilatory grain surface protective agent and the raw material skin depilatory method have the following technical effects:
the enzyme depilatory grain surface protective agent prepared by the preparation method can slightly tan leather grain surfaces, the molecular weight of the synthesized enzyme depilatory grain surface protective agent is larger than that of a dialdehyde compound, the molecular tail end has N-hydroxymethyl, and the pH value in the environment of depilatory bath solution is as follows: under the condition of 8-9, the crosslinking reaction can be directly carried out with the amino group of the collagen of the leather grain surface, so that the effect of protease on the leather grain surface for a long time, particularly the effect of the grain surface of the leather edge part, can be avoided in the enzyme unhairing process, the grain surface is protected, the leather quality is improved, the operation is convenient, the promotion of the enzyme unhairing technology is convenient to clean, and the cleaning level of the leather unhairing production process is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides an enzyme depilatory grain surface protective agent, which is prepared by the following method: adding a dialdehyde compound, an amino compound and water into a reaction kettle according to a certain proportion, controlling the temperature at 30-35 ℃, stirring until the dialdehyde compound, the amino compound and the water are completely dissolved, dropwise adding a sodium hydroxide solution, controlling the pH value at 5.0-9.0, heating to 50-80 ℃, and reacting at constant temperature for 6-10h; and cooling after the reaction is finished, adding formic acid to adjust the pH value to 2.5-3.5, discharging and packaging to obtain the enzyme depilatory grain surface protective agent. Preferably, formic acid is added to adjust the pH to 3.0.
Preferably, the molecular design synthesis of the enzymatic depilatory grain surface protective agent of the present invention is schematically as follows:
preferably, the dialdehyde compound comprises a dialdehyde compound with a carbon chain of 2-8C. Preferably, the dialdehyde compound is one or more of glyoxal, malondialdehyde, succindialdehyde and glutaraldehyde. Preferably, the amino compound is one or more of urea, glycine, lysine and melamine. Preferably, the dialdehyde compound is used in an amount of 1 to 4 parts. The dosage of the amino compound is 1-3 parts. The preparation method is simple and convenient to operate.
The invention also provides a raw material skin unhairing method, which comprises the following steps: adding an animal skin complex enzyme depilatory into the raw material skin subjected to the main soaking treatment, and adding an enzyme depilatory grain surface protective agent into the bath liquid to slightly tanning and fix grain surface collagen fibers until depilation is finished when the raw material skin rotates for a certain time until the hair roots at the edge part are loosened.
Specifically, the raw skin unhairing method comprises the following steps: adding 80% of water, 0.2% of FG-E surfactant and an animal skin complex enzyme depilatory into a rotary drum of the raw material leather subjected to main soaking treatment, rotating at a low speed for 30 minutes and stopping for 30 minutes, checking the looseness of hair roots at the edge part after 2 times, immediately adding an enzyme depilatory grain surface protective agent, slightly tanning and fixing grain surface collagen fibers, continuously rotating at the low speed until most of hairs are completely removed, adding an ashless expanding agent for alkali expansion, and further removing all hairs and dispersing the collagen fibers until the hairs are completely removed.
Preferably, the preparation method of the enzyme depilatory grain surface protective agent comprises the following steps: adding a dialdehyde compound, an amino compound and water into a reaction kettle according to a certain proportion, controlling the temperature at 30-35 ℃, stirring until the dialdehyde compound, the amino compound and the water are completely dissolved, dropwise adding a sodium hydroxide solution, controlling the pH at 5.0-9.0, heating to 50-80 ℃, and reacting at a constant temperature for 6-10 hours; after the reaction is finished, the temperature is reduced, and formic acid is added to adjust the pH value to 2.5-3.5. Preferably, formic acid is added to adjust the pH to 3.0. Discharging and packaging to obtain the enzyme depilatory grain surface protective agent. In the embodiment, the dialdehyde compound is one or more of glyoxal, malondialdehyde, succindialdehyde and glutaraldehyde. The amino compound is one or more of urea, glycine, lysine and melamine.
Preferably, the compound enzyme depilatory for animal skin is prepared from the following components: 5-20 parts of neutral protease or alkaline protease, 0-10 parts of elastase, 0.5-15 parts of lipase, 0-10 parts of enzyme penetration enhancer, 0-50 parts of pH regulator and 0-95 parts of diluent. The animal skin compound enzyme depilatory can adopt the existing animal skin compound enzyme depilatory.
Example 1:
the raw hides used in this example were generally common salt preserved rawhide, all in weight percent. The processing method of the raw leather of the embodiment is as follows:
(1) Pre-soaking: adding 200% water, 0.2% FMC bactericide, 0.4% soda ash and 0.2% FG-E surfactant into a rotary drum, rotating at low speed for 5 min, stopping for 55 min, 6 times, total 6h, and standing for 22h; removing meat and subcutaneous tissue;
(2) Main soaking: adding 200% water, 0.2% FMC bactericide, 0.5% soda ash and 0.3% FG-E surfactant into a rotary drum, rotating at low speed for 5 min, stopping for 55 min, 6 times, total 6h, and standing for 22h; rotating for 30min, and draining;
(3) Depilation: adding 80% water and 0.2% FG-E surfactant into the rotary drum, adding animal skin complex enzyme depilatory preparation 1.0%, rotating at low speed for 30min, stopping for 30min, 2 times, and totally 2 hr; and (3) checking the hair root looseness of the side margins, immediately adding 0.5% enzyme depilation grain surface protective agent, slightly tanning and fixing the grain surface collagen fibers, and protecting the grain surfaces from excessive loss of depilation enzyme. Continuing to rotate at a low speed until most of the wool is removed; then, an ashless expanding agent is added for alkali expansion, and all hairs are further removed and the collagen fibers are dispersed.
(4) The subsequent steps are carried out according to the procedures of ash-free and sulfur-free liming, softening, degreasing, pickling and tanning.
In the embodiment, the formula of the animal skin complex enzyme depilatory is as follows: 0.5kg of novacin SG protease, 10kg of 1398 protease, 0.5kg of elastase TX, 2kg of lipase Ultra G, 3kg of lauryl sodium sulfate, 5kg of sodium tripolyphosphate, 5kg of wood powder, 20kg of ammonium sulfate and 38kg of sodium sulfate, and the components are uniformly mixed to obtain the animal skin complex enzyme depilatory.
In this embodiment, the preparation method of the enzyme depilatory grain surface protective agent comprises: firstly, 2 parts of glyoxal, 1.0 part of urea and water are added into a reaction kettle, the temperature is controlled to be 30-35 ℃, the mixture is stirred until the mixture is completely dissolved, then sodium hydroxide solution is dripped, the pH value is controlled to be 5.0-9.0, the temperature is raised to 50-80 ℃, and the constant temperature reaction is carried out for 6-10 hours. And after the reaction is finished, cooling, adding formic acid to adjust the pH value to 3.0, discharging and packaging to obtain the enzyme depilatory grain surface protective agent.
The performance evaluation results of the blue wet hide processed by the method of example 1 and the blue wet hide processed by the conventional enzyme dehairing method are as follows:
TABLE 1
| Serial number | Item | Method of carrying out the invention 1 | Conventional enzyme depilation method |
| 1 | Degree of grain surface integrity | 8.5 | 1 |
| 2 | Degree of pore clarity | 8.5 | 1 |
| 3 | Blue peel not looseDegree of dough | 8.5 | 1 |
| 4 | Degree of compaction of blue skin | 7.5 | 1 |
Note: the 1-10 scoring method, the higher the score, the better the leather performance.
As can be seen from Table 1, the wet cattlehide skin prepared in example 1 of the present invention has a complete grain surface, clear pores, and tight and loose blue skin.
Example 2:
the raw hides of example 2 were typically common salt preserved bovine hides, all in weight percent. The processing method of the raw leather of the embodiment is as follows:
(1) Pre-soaking: adding 200% water, 0.2% FMC bactericide, 0.4% soda ash and 0.2% FG-B surfactant into a rotary drum, rotating at low speed for 5 min, stopping for 55 min, 6 times, total 6h, and standing for 22h; removing meat and subcutaneous tissue;
(2) Main soaking: adding 200% water, 0.2% FMC bactericide, 0.5% soda ash and 0.3% FG-B surfactant into a rotary drum, rotating at low speed for 5 min, stopping for 55 min, 6 times, totally 6h, and standing for 22h; rotating for 30min, and draining;
(3) Depilation: adding 80% water and 0.2% FG-B surfactant into the rotary drum, adding animal skin complex enzyme depilatory preparation 1.0%, rotating at low speed for 30min, stopping for 30min, 2 times, and totally 2 hr; and (3) checking the hair root looseness of the side margin part, immediately adding 0.5% enzyme depilation grain surface protective agent, slightly tanning and fixing the grain surface collagen fiber, and protecting the grain surface from excessive loss of depilation enzyme. Continuing to rotate at a low speed until most of the wool is removed; then, an ashless expanding agent is added for alkali expansion, and all hairs are further removed and the collagen fibers are dispersed.
(4) The subsequent steps are carried out according to the procedures of ash-free and sulfur-free liming, softening, degreasing, pickling and tanning.
The formula of the compound enzyme depilatory for animal skin in the embodiment is as follows: 0.5kg of SG protease of Novixin, 10.0kg of 1398 protease, 0.5kg of elastase TX, 2kg of lipase Ultra G, 3kg of sodium dodecyl sulfate, 5kg of sodium tripolyphosphate, 5kg of wood powder, 20kg of ammonium sulfate and 38kg of sodium sulfate, and uniformly mixing to obtain the animal skin complex enzyme depilatory.
The preparation method of the enzyme depilatory grain surface protective agent comprises the steps of firstly adding 3.0 parts of glyoxal, 2.0 parts of urea and water into a reaction kettle, controlling the temperature to be 30-35 ℃, stirring until the glyoxal, the urea and the water are completely dissolved, then dropwise adding a sodium hydroxide solution, controlling the pH to be 5.0-9.0, heating to be 50-80 ℃, and reacting at constant temperature for 6-10 hours. And after the reaction is finished, cooling, adding formic acid to adjust the pH value to 3.0, discharging and packaging to obtain the enzyme depilatory grain surface protective agent.
The performance evaluation results of the blue leather wet processed by the method and the blue leather wet processed by the conventional enzyme unhairing method are as follows:
TABLE 2
| Serial number | Item | Method of carrying out 2 of the invention | Conventional enzyme depilation method |
| 1 | Degree of grain surface integrity | 8.0 | 1 |
| 2 | Degree of pore clarity | 8.0 | 1 |
| 3 | Degree of loose-face of blue skin | 8.5 | 1 |
| 4 | Degree of compaction of blue skin | 7.5 | 1 |
Note: the 1-10 scoring method, the higher the score, the better the leather performance.
As can be seen from Table 2, the wetted kraft skin prepared in example 2 of the present invention has a complete grain surface, clear pores, and a firm and loose blue skin.
Example 3:
in this example 3, the raw material skin is generally common salt preserved cowhide, and the weight is calculated by the weight percentage of the skin; the processing method of the raw leather of the embodiment is as follows:
(1) Pre-soaking: adding 200% water, 0.2% FMC bactericide, 0.4% soda ash and 0.2% FG-B surfactant into a rotary drum, rotating at low speed for 5 min, stopping for 55 min, 6 times, total 6h, and standing for 22h; removing meat and subcutaneous tissue;
(2) Main soaking: adding 200% water, 0.2% FMC bactericide, 0.5% soda ash and 0.3% FG-B surfactant into a rotary drum, rotating at low speed for 5 min, stopping for 55 min, 6 times, totally 6h, and standing for 22h; rotating for 30min, and draining;
(3) Depilation: adding 80% water and 0.2% FG-B surfactant into the rotary drum, adding animal skin complex enzyme depilatory preparation 1.0%, rotating at low speed for 30min, stopping for 30min, 2 times, and totally 2 hr; and (3) checking the hair root looseness of the side margin part, immediately adding 0.5% enzyme depilation grain surface protective agent, slightly tanning and fixing the grain surface collagen fiber, and protecting the grain surface from excessive loss of depilation enzyme. Continuously keeping low-speed rotation until most of hairs are removed; then, an ashless expanding agent is added for alkali expansion, and all hairs are further removed and the collagen fibers are dispersed.
(4) The subsequent steps are carried out according to the procedures of ashless and sulfur-free liming, softening, degreasing, pickling and tanning.
The formula of the animal skin complex enzyme depilatory in the embodiment is as follows: 0.5kg of SG protease of Novixin, 10.0kg of 1398 protease, 0.5kg of elastase TX, 2kg of lipase Ultra G, 3kg of lauryl sodium sulfate, 5kg of sodium tripolyphosphate, 5kg of wood powder, 20kg of ammonium sulfate and 38kg of sodium sulfate, and the components are uniformly mixed to obtain the animal skin complex enzyme depilatory.
The preparation method of the enzyme depilation grain surface protective agent comprises the steps of firstly adding 4 parts of glyoxal, 2.0 parts of urea, 1.0 part of glycine and water into a reaction kettle, controlling the temperature to be 30-35 ℃, stirring until the glycine and the water are completely dissolved, then dropwise adding a sodium hydroxide solution, controlling the pH to be 5.0-9.0, heating to 50-80 ℃, and carrying out constant temperature reaction for 6-10 hours. And after the reaction is finished, cooling, adding formic acid to adjust the pH value to 3.0, discharging and packaging to obtain the enzyme depilatory grain surface protective agent.
The performance evaluation results of the blue leather wet processed by the method and the blue leather wet processed by the conventional enzyme unhairing method are as follows:
TABLE 3
| Serial number | Item | Method for carrying out 3 of the invention | Conventional enzyme depilation method |
| 1 | Degree of grain surface integrity | 8.0 | 1 |
| 2 | Degree of pore clarity | 8.0 | 1 |
| 3 | Degree of loose dough | 8.0 | 1 |
| 4 | Degree of compaction of blue skin | 7.5 | 1 |
Note: the 1-10 scoring method, the higher the score, the better the leather performance.
As can be seen from Table 3, the wetted kraft blue skin prepared in example 3 of the present invention has a complete grain surface, clear pores, and a tight and firm blue skin.
The invention utilizes the slight tanning effect of the enzyme depilatory grain surface protective agent on grain surfaces. After the animal skin is mainly soaked in water, adding an animal skin complex enzyme depilatory into the bath lotion, and rotating for a certain time; after the hair roots at the equilateral part are loosened, the enzyme depilation grain surface protective agent prepared by the invention is directly added into the bath lotion to slightly tan and fix the grain surface, so that the grain surface is prevented from being continuously affected by protease, and the defects of loose surface, grain surface loss and the like are avoided until depilation is finished, thereby improving the defects of leather quality reduction, complex operation, time consumption, labor consumption and the like in the enzyme depilation process.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (4)
1. A method for dehairing hides, the method comprising: adding an animal skin complex enzyme depilatory into the raw leather subjected to the main water immersion treatment, and adding an enzyme depilatory grain surface protective agent into bath liquid to slightly tanning and fix grain surface collagen fibers when the hair roots at the edge part are loosened after rotating for a certain time until the depilation is finished;
wherein the enzyme depilatory grain surface protective agent is prepared by the following method: adding a dialdehyde compound, an amino compound and water into a reaction kettle according to a certain proportion, wherein the dosage of the dialdehyde compound is 1-4 parts, the dosage of the amino compound is 1-3 parts, controlling the temperature at 30-35 ℃, stirring until the dialdehyde compound and the amino compound are completely dissolved, dropwise adding a sodium hydroxide solution, controlling the pH value at 5.0-9.0, heating to 50-80 ℃, and reacting at constant temperature for 6-10 hours; after the reaction is finished, cooling, adding formic acid to adjust the pH value to 2.5-3.5, and obtaining the enzyme depilatory grain surface protective agent.
2. A method for unhairing raw leather as claimed in claim 1, wherein 80% of water, 0.2% FG-E surfactant and animal leather complex enzyme depilatory are added to the drum of the raw leather after the main soaking treatment, the drum is rotated at a low speed for 30 minutes and stopped for 30 minutes, after 2 times, the loose of the hair root at the margin part is checked, the enzyme depilatory grain surface protective agent is immediately added, the grain surface collagen fiber is slightly tanned and fixed, the drum is continuously rotated at a low speed until most of the hair is completely removed, and then the alkali swelling agent is added until the unhairing is completed.
3. The raw material skin unhairing method as claimed in claim 1, wherein the dialdehyde compound is one or more of glyoxal, malondialdehyde, succindialdehyde and glutaraldehyde; the amino compound is one or more of urea, glycine, lysine and melamine.
4. The raw material skin unhairing method as claimed in claim 1, wherein the animal skin compound enzyme depilatory is prepared from the following components:
5-20 parts of neutral protease or alkaline protease, 0-10 parts of elastase, 0.5-15 parts of lipase, 0-10 parts of enzyme penetration enhancer, 0-50 parts of pH regulator and 0-95 parts of diluent.
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