CN115449568B - Leather water-dipping agent and preparation method and application thereof - Google Patents
Leather water-dipping agent and preparation method and application thereof Download PDFInfo
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- CN115449568B CN115449568B CN202211126471.8A CN202211126471A CN115449568B CN 115449568 B CN115449568 B CN 115449568B CN 202211126471 A CN202211126471 A CN 202211126471A CN 115449568 B CN115449568 B CN 115449568B
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The invention belongs to the technical field of chemical industry, and particularly relates to a leather water-dipping agent and a preparation method and application thereof. The invention utilizes the two anionic surfactants of the diisooctyl sulfosuccinate sodium salt and the sodium dodecyl benzene sulfonate to compound, has the synergistic effect, and is added with the anhydrous ethanol and the dodecyl dimethyl benzyl ammonium chloride antibacterial component, thereby being applied to the tanning soaking process, having good loosening effect on the fibers of raw leather and good stretching effect on leather. In the soaking process, the leather soaking agent is added, so that large and thick root hairs in the hairs can be firstly fallen off, the hairs are filtered in the liquid changing process, and the hairs can be removed by using a small amount of sulfides in the subsequent unhairing and liming processes, thereby achieving the effects of successfully removing the hairs and not damaging the grain surface of the leather, and realizing the effect of not damaging the structure of the peltry under the condition of ensuring the subsequent unhairing.
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to a leather water-dipping agent and a preparation method and application thereof.
Background
The preparation stage of leather production and processing comprises soaking, unhairing, liming and the like, and the key procedures comprise a soaking process, wherein the quality of soaking directly influences the subsequent work of leather production. The traditional soaking method mainly adopts water or adopts a soaking method that water is added with preservative, surfactant, acid, alkali, salt and other auxiliary agents, and the soaking process is accelerated by increasing the temperature by the soaking method only adopting water, so that the problems of excessive soaking, excessive hydrolysis of the preserved proteins and the like are easily generated.
Meanwhile, because the alkali sulfide method dehairing produces a large amount of wool solubles and semi-soluble fragments thereof to precipitate, COD, BOD, TSS and sludge content in the wastewater are increased, wastewater treatment load is serious, and the wool protection dehairing method becomes necessary technological requirements. Compared with the existing alkaline method for hair-protecting dehairing and enzyme dehairing, both can reduce emission, but both have the defects: the former has incomplete hair protection and limited effect of the renewable resources of the hair; the latter is difficult to control, and the stability of leather quality is difficult, so that the leather industry has long been pending. Natural collagen has a better resistance to various proteases, but this resistance is greatly reduced when the pelt is denatured or partially denatured by the action of acids, bases, salts. Also, once the pelt is subjected to the action of alkali and enzymes, the ability of the pelt to resist the action of alkali and enzymes is further impaired. Dehairing under the action of alkali or enzyme, and the dehaired leather collagen can minimize damage to leather making requirements under good operation. However, it is difficult to ensure that the pelt is not damaged by subsequent alkali and enzyme action.
In the soaking process, after acid, alkali and salt are used, the capability of resisting the action of alkali and enzyme again in subsequent dehairing is further weakened, the structure of the hide is easily damaged, and the problems of loose surface, damaged surface, enlarged pores, poor shrinkage of an anti-tanning agent and the like exist after the leather is manufactured.
Disclosure of Invention
The invention aims at solving the existing problems and provides a leather water dipping agent and a preparation method and application thereof. The leather soaking agent of the invention hardly damages the structure of the pelt under the condition of ensuring the subsequent dehairing.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a leather water-dipping agent which comprises the following components in percentage by mass: 0.05 to 0.18 percent of sulfonated diisooctyl succinate sodium salt, 3 to 10 percent of sodium dodecyl benzene sulfonate, 0.03 to 0.15 percent of dodecyl dimethyl benzyl ammonium chloride, 2 to 5 percent of absolute ethyl alcohol and 85 to 94.92 percent of water.
Preferably, the mass fraction of the sodium diisooctyl sulfosuccinate salt in the leather water-dipping agent is 0.08-0.15%.
Preferably, the mass fraction of the sodium dodecyl benzene sulfonate in the leather water-dipping agent is 5-8%.
Preferably, the mass fraction of the dodecyl dimethyl benzyl ammonium chloride in the leather water-dipping agent is 0.05-0.12%.
Preferably, the leather water-dipping agent comprises the following components in percentage by mass: 0.08 to 0.15 percent of sulfonated diisooctyl succinate sodium salt, 5 to 8 percent of sodium dodecyl benzene sulfonate, 0.05 to 0.12 percent of dodecyl dimethyl benzyl ammonium chloride, 2 to 5 percent of absolute ethyl alcohol and 87 to 92.87 percent of water.
The invention also provides a preparation method of the leather water-dipping agent, which comprises the following steps:
firstly mixing sodium dodecyl benzene sulfonate, water and partial absolute ethyl alcohol to obtain sodium dodecyl benzene sulfonate solution;
and (3) carrying out second mixing on the sodium dodecyl benzene sulfonate solution, the sodium diisooctyl sulfosuccinate, the dodecyl dimethyl benzyl ammonium chloride and the residual absolute ethyl alcohol to obtain the leather water-immersing agent.
Preferably, the time of the first mixing is 5-10 min.
Preferably, the second mixing time is 8-15 min.
The invention also provides the leather impregnating agent and application of the leather impregnating agent obtained by the preparation method in leather impregnating.
Preferably, the dosage of the leather water-dipping agent is 0.2-1.0% of the mass of the leather.
The invention also provides a soaking method, which comprises the following steps: mixing leather, water and a leather soaking agent, and stirring and soaking in sequence, wherein the leather soaking agent is the leather soaking agent according to the technical scheme.
The invention provides a leather water-dipping agent which comprises the following components in percentage by mass: 0.05 to 0.18 percent of sulfonated diisooctyl succinate sodium salt, 3 to 10 percent of sodium dodecyl benzene sulfonate, 0.03 to 0.15 percent of dodecyl dimethyl benzyl ammonium chloride, 2 to 5 percent of absolute ethyl alcohol and 85 to 94.92 percent of water. The invention utilizes two anionic surfactants of sodium diisooctyl sulfosuccinate and sodium dodecyl benzene sulfonate to compound, and adds anhydrous ethanol and dodecyl dimethyl benzyl ammonium chloride antibacterial components, thus being applied to the tanning soaking process, having good loosening effect on fibers of raw leather and good stretching effect on leather (loosening of leather fibers and stretching of leather are usually evaluated by the expansion degree of leather, the expansion degree is mainly represented by the weight gain of leather, and reflects the water absorption degree caused by the hydrotropic expansion of various substances on leather collagen in the soaking process.
In the soaking process, the leather water-soaking agent is added, so that large and thick root hairs in the hairs can be firstly shed, the hairs are filtered out in the liquid exchange process, and the hairs can be removed by using a small amount of sulfide (0.3-0.6%) in the subsequent unhairing and liming processes, so that the effects of successfully removing the hairs and not damaging the grain surface of the leather (the surface of the leather is even and smooth, obvious cracks and chemical etching are not found) are achieved, the aim of not damaging the structure of the peltry is fulfilled under the condition of ensuring the subsequent unhairing, and the problem that a large amount of hair solubles and semi-dissolved fragments thereof are precipitated in the unhairing by an alkali sulfide method to cause serious wastewater treatment load is solved.
Further, the leather water-immersing agent of the invention improves the permeability through the synergistic effect of the two anionic surfactants, and can greatly shorten the immersing time of the raw leather, thereby realizing the effect of effectively shortening the treatment time. The simple soaking process in the prior art has poor unhairing effect and long soaking time, and after the leather soaking agent is added for 2 hours, the hair can be effectively removed by 2/3, and the time is shortened by 10-15 hours.
Furthermore, the leather water-soaking agent disclosed by the invention does not need to add acid, alkali, salt and other auxiliary agents in the water-soaking process, so that the use of other chemical materials in the water-soaking process can be reduced, and the energy consumption of the production environment can be reduced. Meanwhile, the leather water-dipping agent disclosed by the invention is prepared from ecological environment-friendly materials, has high biodegradability, and is favorable for reducing environmental pollution and comprehensive cost.
The invention also provides the application of the leather impregnating agent or the leather impregnating agent obtained by the preparation method in leather impregnating, and the dosage of the leather impregnating agent is 0.2-1.0% of the mass of leather.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph showing the change of the water immersion rate with the mass fraction (0-2%) of diisooctyl sulfosuccinate sodium salt when the mass fraction of sodium dodecyl benzene sulfonate is 5% and 8% respectively in the examples of the present invention.
Detailed Description
The invention provides a leather water-dipping agent which comprises the following components in percentage by mass: 0.05 to 0.18 percent of sulfonated diisooctyl succinate sodium salt, 3 to 10 percent of sodium dodecyl benzene sulfonate, 0.03 to 0.15 percent of dodecyl dimethyl benzyl ammonium chloride, 2 to 5 percent of absolute ethyl alcohol and 85 to 94.92 percent of water.
In the present invention, all materials used are commercial products in the art unless otherwise specified.
In the invention, the leather impregnating agent is preferably light yellow transparent liquid, the viscosity value of the leather impregnating agent is preferably 1-1.2 cP, more preferably 1.1cP, and the fluidity is strong.
In the invention, the mass fraction of the sodium diisooctyl sulfosuccinate in the leather water-immersing agent is preferably 0.08-0.15%, more preferably 0.12%.
In the invention, the sulfonated dioctyl succinate sodium salt is an anionic surfactant material and has good emulsifying and penetrating properties.
In the invention, the mass fraction of sodium dodecyl benzene sulfonate in the leather impregnating agent is preferably 5-8%.
In the invention, the sodium dodecyl benzene sulfonate is an anionic surfactant material, has good surface activity and strong hydrophilicity, and can effectively reduce the tension of an oil-water interface so as to achieve the emulsification effect.
In the invention, the two anionic surfactants, namely the sodium diisooctyl sulfosuccinate and the sodium dodecyl benzene sulfonate, have synergistic effect, and the two anionic surfactants are mixed to jointly act, so that the emulsifying property and the wettability are improved, the purpose of degreasing and soaking is realized, and the soaking rate of the peltry is improved.
In the invention, the mass fraction of the dodecyl dimethyl benzyl ammonium chloride in the leather water-dipping agent is preferably 0.05-0.12%.
In the present invention, the dodecyldimethylbenzyl ammonium chloride serves as an antibacterial agent and a cationic surfactant. In the invention, a small amount of dodecyl dimethyl benzyl ammonium chloride (cationic surfactant) is added, so that the anionic surfactant (comprising diisooctyl sulfosuccinate sodium salt and sodium dodecyl benzene sulfonate) can better wrap grease in leather to form stable micelles and disperse the stable micelles in water, and the dodecyl dimethyl benzyl ammonium chloride can properly weaken or neutralize the charge of the micelles to form a stable grease emulsifying system, thereby achieving better deoiling and penetrating effects.
In the present invention, the absolute ethyl alcohol plays a role of antibacterial and further dispersing the surfactant and improving stability.
In the invention, the leather water-dipping agent preferably comprises the following components in percentage by mass: 0.08 to 0.15 percent of sulfonated diisooctyl succinate sodium salt, 5 to 8 percent of sodium dodecyl benzene sulfonate, 0.05 to 0.12 percent of dodecyl dimethyl benzyl ammonium chloride, 2 to 5 percent of absolute ethyl alcohol and 87 to 92.87 percent of water.
The invention also provides a preparation method of the leather water-dipping agent, which comprises the following steps:
firstly mixing sodium dodecyl benzene sulfonate, water and partial absolute ethyl alcohol to obtain sodium dodecyl benzene sulfonate solution;
and (3) carrying out second mixing on the sodium dodecyl benzene sulfonate solution, the sodium diisooctyl sulfosuccinate, the dodecyl dimethyl benzyl ammonium chloride and the residual absolute ethyl alcohol to obtain the leather water-immersing agent.
The method comprises the step of carrying out first mixing on sodium dodecyl benzene sulfonate, water and partial absolute ethyl alcohol to obtain sodium dodecyl benzene sulfonate solution.
In the present invention, sodium dodecylbenzenesulfonate, water and a part of absolute ethanol are preferably mixed in this order.
In the invention, sodium dodecyl benzene sulfonate is preferably added into water and mixed, so that the sodium dodecyl benzene sulfonate is dissolved to obtain semitransparent solution, the mixing mode is preferably stirring, and the stirring rotating speed is preferably 150-300 rpm, more preferably 200rpm; the stirring time is preferably 5 to 10 minutes, more preferably 8 minutes.
After the semitransparent solution is obtained, the partial absolute ethyl alcohol is preferably added into the semitransparent solution, wherein the addition amount of the partial absolute ethyl alcohol is preferably 1-1.5% of the mass fraction of the leather soaking agent, and more preferably 1%. According to the invention, partial absolute ethyl alcohol is added into the semitransparent solution, so that the sodium dodecyl benzene sulfonate is further dispersed in water and the stability is improved.
After obtaining the sodium dodecyl benzene sulfonate solution, the invention carries out second mixing on the sodium dodecyl benzene sulfonate solution, the sodium diisooctyl sulfosuccinate, the dodecyl dimethyl benzyl ammonium chloride and the residual absolute ethyl alcohol to obtain the leather water-leaching agent.
The invention preferably adds the sodium diisooctyl sulfosuccinate, the dodecyl dimethyl benzyl ammonium chloride and the residual absolute ethyl alcohol into the sodium dodecyl benzene sulfonate solution in sequence.
According to the invention, the sodium diisooctyl sulfosuccinate is preferably added into the sodium dodecyl benzene sulfonate solution and then stirred, the stirring rotating speed is preferably the same as that of mixing and stirring of the sodium dodecyl benzene sulfonate into water, and the stirring time is preferably 3-5 min, more preferably 4min.
The invention preferably sequentially adds the dodecyl dimethyl benzyl ammonium chloride and the residual absolute ethyl alcohol into the sodium dodecyl benzene sulfonate solution and then stirs the mixture, wherein the stirring speed is preferably 100-200 rpm, more preferably 150rpm, and the stirring time is preferably 5-10 min, more preferably 6min.
The invention also provides the leather impregnating agent and application of the leather impregnating agent obtained by the preparation method in leather impregnating.
In the present invention, the amount of the leather impregnating agent is preferably 0.2 to 1.0% by mass of leather, more preferably 0.5%.
The invention also provides a soaking method, which comprises the following steps: mixing leather, water and a leather soaking agent, and stirring and soaking in sequence, wherein the leather soaking agent is the leather soaking agent according to the technical scheme.
In the present invention, the soaking time is preferably 1 to 3 hours, more preferably 2 hours.
The soaking process of leather processing is the basis for obtaining high quality leather. Even and sufficient soaking can remove fiber interstitial substances which are not needed in leather making, clean dirt on leather, loosen leather dirt and remove grease. Creating an optimal fur state for the subsequent liming process. In the process of soaking, channels among leather fibers are opened to enable moisture to enter the leather, so that the purpose of returning the original leather is achieved. Therefore, the quality of the soaking process can have an important influence on the subsequent processing of leather.
For further explanation of the present invention, the leather impregnating agent, the preparation method and application thereof provided by the present invention are described in detail below with reference to the accompanying drawings and examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The leather water-dipping agent of the embodiment 1 comprises the following components in percentage by mass: 0.08% of diisooctyl sulfosuccinate sodium salt, 5% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 92.87% of water.
The preparation method comprises the following steps: sodium dodecyl benzene sulfonate was taken and dissolved in water and stirred at 200rpm for 8 minutes. After this procedure, half of absolute ethanol was added, followed by addition of diisooctyl sulfosuccinate sodium salt thereto, maintaining the rotation speed, and stirring for 5 minutes. And adding dodecyl dimethyl benzyl ammonium chloride and the rest absolute ethyl alcohol, stirring and uniformly mixing at a rotating speed of 150rpm, and stirring for 6 minutes to obtain the leather water-dipping agent.
Example 2
The leather water-dipping agent of the embodiment 2 comprises the following components in percentage by mass: 0.05% of diisooctyl sulfosuccinate sodium salt, 5% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 92.90% of water.
The preparation method is the same as in example 1.
Example 3
The leather impregnating agent of the embodiment 3 comprises the following components in percentage by mass: 0.12% of diisooctyl sulfosuccinate sodium salt, 5% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 92.83% of water.
The preparation method is the same as in example 1.
Example 4
The leather impregnating agent of the embodiment 4 comprises the following components in percentage by mass: 0.15% of diisooctyl sulfosuccinate sodium salt, 5% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 92.80% of water.
The preparation method is the same as in example 1.
Example 5
The leather water-dipping agent of the embodiment 5 comprises the following components in percentage by mass: 0.18% of diisooctyl sulfosuccinate sodium salt, 5% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 92.77% of water.
The preparation method is the same as in example 1.
Example 6
The leather impregnating agent of the embodiment 6 comprises the following components in percentage by mass: 0.08% of diisooctyl sulfosuccinate sodium salt, 8% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 89.87% of water.
The preparation method is the same as in example 1.
Example 7
The leather impregnating agent of the embodiment 7 comprises the following components in percentage by mass: 0.05% of diisooctyl sulfosuccinate sodium salt, 8% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 89.90% of water.
The preparation method is the same as in example 1.
Example 8
The leather impregnating agent of the embodiment 8 comprises the following components in percentage by mass: 0.12% of diisooctyl sulfosuccinate sodium salt, 8% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 89.83% of water.
The preparation method is the same as in example 1.
Example 9
The leather impregnating agent of the embodiment 9 comprises the following components in percentage by mass: 0.15% of diisooctyl sulfosuccinate sodium salt, 8% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 89.80% of water.
The preparation method is the same as in example 1.
Example 10
The leather impregnating agent of the embodiment 10 comprises the following components in percentage by mass: 0.18% of diisooctyl sulfosuccinate sodium salt, 8% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 89.77% of water.
The preparation method is the same as in example 1.
Comparative example 1
The leather water-dipping agent of the comparative example 1 comprises the following components in percentage by mass: 0% of diisooctyl sulfosuccinate sodium salt, 5% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 92.95% of water.
The preparation method is the same as in example 1.
Comparative example 2
The leather water-dipping agent of comparative example 2 comprises the following components in percentage by mass: 0.03% of diisooctyl sulfosuccinate sodium salt, 5% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 92.92% of water.
The preparation method is the same as in example 1.
Comparative example 3
The leather impregnating agent of comparative example 3 comprises the following components in percentage by mass: 0.2% of diisooctyl sulfosuccinate sodium salt, 5% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 92.75% of water.
The preparation method is the same as in example 1.
Comparative example 4
The leather impregnating agent of comparative example 4 comprises the following components in percentage by mass: 0% of diisooctyl sulfosuccinate sodium salt, 8% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 89.95% of water.
The preparation method is the same as in example 1.
Comparative example 5
The leather water-dipping agent of the comparative example 5 comprises the following components in percentage by mass: 0.03% of diisooctyl sulfosuccinate sodium salt, 8% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 89.92% of water.
The preparation method is the same as in example 1.
Comparative example 6
The leather impregnating agent of comparative example 6 comprises the following components in percentage by mass: 0.2% of diisooctyl sulfosuccinate sodium salt, 8% of sodium dodecyl benzene sulfonate, 0.05% of dodecyl dimethyl benzyl ammonium chloride, 2% of absolute ethyl alcohol and 89.75% of water.
The preparation method is the same as in example 1.
Application example 1
The leather impregnating agents of examples 1 to 10 and comparative examples 1 to 6 were subjected to impregnating experiments.
Soaking experiment: and (3) taking a piece of leather from the same type of cowhide, and weighing to obtain the quality of the leather before soaking. Then putting the leather into a rotary drum, adding distilled water into the leather according to the solid-to-liquid ratio of 20% (the dry leather mass is the ratio of the distilled water mass), respectively adding leather water soaking agents of examples 1-8 and comparative examples 1-8 with the dry leather mass fraction of 1% into the system, rotating and stirring for 25 minutes, stopping soaking for 3 hours, taking out the leather, cleaning with clear water, naturally drying the leather at the normal temperature for 2 hours, weighing again to obtain the quality of the soaked leather.
The water immersion effect was calculated from the mass difference, the calculation formula is shown below, and the water immersion rate result is shown in table 1.
The water immersion ratio= (leather after immersion-leather before immersion)/leather before immersion x 100%.
Table 1 leather water immersion results
| Leather water-immersing agent | Water immersion rate | Leather water-immersing agent | Water immersion rate |
| Example 1 | 66％ | Comparative example 1 | 15％ |
| Example 2 | 54％ | Comparative example 2 | 38％ |
| Example 3 | 75％ | Comparative example 3 | 40％ |
| Example 4 | 68％ | Comparative example 4 | 18％ |
| Example 5 | 57％ | Comparative example 5 | 42％ |
| Example 6 | 68％ | Comparative example 6 | 44％ |
| Example 7 | 59％ | / | / |
| Example 8 | 77％ | / | / |
| Example 9 | 69％ | / | / |
| Example 10 | 63％ | / | / |
As can be seen from the experimental results in Table 1, the leather impregnating agent can achieve an impregnating rate of more than 54% and up to 75%.
Examples 1 to 10 and comparative examples 1 to 6 were carried out by adding diisooctyl sulfosuccinate sodium salt (0%, 0.03%, 0.05%, 0.08%, 0.12%, 0.15%, 0.18%, 0.2%) to sodium dodecylbenzenesulfonate (5% and 8%) respectively, and the results of the change in the water immersion rate are shown in fig. 1.
As can be seen from fig. 1, as the addition ratio of the diisooctyl sulfosuccinate sodium salt is continuously increased (in the case that the mass fractions of the sodium dodecylbenzenesulfonate and other components except water are unchanged), the water immersion rate is increased and then decreased. When the adding amount of the diisooctyl sulfosuccinate sodium salt is 0-0.12%, the highest water soaking rate is achieved along with the increasing of the adding amount. The oil-removing and water-soaking agent is the result of the combined action of two anionic surfactants of sodium dodecyl benzene sulfonate and sodium diisooctyl sulfosuccinate, and the two anionic surfactants have a synergistic effect, and the emulsifying property and the wettability are improved together through mixing, so that the oil-removing and water-soaking purposes are realized. When the addition amount of the diisooctyl sulfosuccinate sodium salt exceeds 0.12%, the water immersion rate is reduced along with the increase of the addition amount, and when the addition amount is too large, a large amount of grease is removed from the leather and uniformly dispersed on the surface of the leather, so that the contact between water and the leather is reduced, an oily barrier layer is formed, the water is difficult to permeate into the leather, and the leather has a strong inhibition effect.
Comparative application example 1
The comparative application example is different from the soaking experiment of the application example 1 only in that the leather soaking agent is not added, the leather is soaked by water only, the test is carried out for 4 times, and the soaking rate results are respectively as follows: 15.6%, 19.6%, 18.8% and 17.9%, and the water immersion rate is 15-20%.
Comparative application example 2
The comparative application example only differs from the above-mentioned soaking experiment of application example 1 in that the type I common soaking agent (polyoxyethylene lauryl ether) was added instead, resulting in a soaking rate of 47.2%.
It can be seen from application examples 1 and comparative application examples 1 to 2 that the leather impregnating agent of the present invention can effectively improve the impregnating effect, make leather have better expansion effect, and can better realize the loosening effect on leather, so that the leather is stretched as much as possible, which has good promotion effect on the subsequent processing of leather.
Application example 2
The leather is subjected to experiments by using leather water dipping agent: presoaking (presoaking the tape Mao Shengpi in a leather making drum, fleshing); primary soaking (adding a water soaking agent in the primary soaking process); unhairing and liming; and (5) deashing and softening. The unhairing and liming is mainly to add surfactant, lime solubilizer, organic amine, enzyme and other materials to remove non-fibrous components in leather, including hyaluronic acid, polysaccharide, fat, epidermis and other substances, and only the fibrous components of leather are reserved.
Respectively cutting leather (cowhide) with the same quality, adding water according to the mass ratio of 150% of the pelt, adding the leather water-dipping agent of the example 1 with the mass ratio of 0.5% of the pelt, and protease with the mass ratio of 0.2% of the pelt: noveven (TM) dehairing enzyme (100000 u/g) is prepared into liquid with the concentration of 9g/L, and 2709 alkaline protease (20000 u/g) of tin-free biotechnology company is prepared into liquid with the concentration of 10 g/L. Put into a rotary drum to stir for 1 hour, and then soaked for 2 hours. After 2 hours of soaking, liquid exchange is carried out, and a large amount of clean water is used for washing in the liquid exchange process so as to wash off the fallen hair.
Table 2 comparison of dehairing process
In this application example, large and thick root hairs in the hair are first removed in the main soaking step. The hair is filtered out in the liquid exchange process, and only 0.4% of sulfide is used for removing the fluff in the unhairing and liming process, so that the effects of successfully removing the hair and not damaging the grain surface of leather are achieved. The application example soaking process can effectively remove 2/3 of hair.
Comparative application example 3
The comparative application example differs from application example 2 only in that a type I common water-immersion agent (polyoxyethylene lauryl ether) was added, and the results are shown in table 2.
As can be seen from table 2, under the same operation procedure, the same dehairing effect can be achieved by using only a small amount of sodium sulfide when the leather water-dipping agent of the present invention is used. And the added amount of sulfide is small, so that the pH is milder, the pH is 10, the alkalinity is low, and the damage degree to the fibers of the leather is small.
Comparative application example 4
The difference between this comparative example and example 2 is only that the leather impregnating agent of example 1 is not added, i.e. only: water was added at a ratio of 150% by mass of pelt, and a mass fraction of protease (same as in application example 2) was 0.2% by mass of pelt. Put into a rotary drum to stir for 1 hour, and then soaked for 2 hours. The process needs to be repeated for 4 times to achieve the same effect as that of application example 2, and the soaking process needs to be kept stand for 1 to 2 hours.
In the dehairing experiment of protease, application example 2 is to directly mix leather with water dipping agent and protease for dehairing by adopting a static (non-stirring) method, and comparative application example 4 is to mix leather with protease only, and take out after soaking for 2 hours to observe the hair shedding condition on the surface of the leather.
The invention also examines different leather types such as sheepskin, kangaroo skin and the like, and contrast shows that the water soaking agent and protease are used for dehairing by blending, so that the water absorption effect of the leather and the like can be effectively improved, and the leather can be quickly softened.
In comparison with the control group, the leather dip of example 1 was used for a time of softening about 2 to 4 hours faster than the leather dip using protease alone (comparative application example 4) (experimental results: 2 hours for cowhide, 2.6 hours for sheep skin, 3.8 hours for kangaroo skin). In addition, the water immersion rate is 5-15% higher than that of the control group (experimental result: cow leather 5.5% higher, sheep leather 13.2% higher, kangaroo skin 14.5% higher). The soft leather is beneficial to enabling protease to permeate into leather fibers more quickly, so that the effect of quick dehairing is realized.
Comparative application example 5
The difference between this comparative example and example 2 is that only when the commercial penetrant JFC was added instead, the effect similar to that of example 2 could be achieved when the addition amount was 1% of the mass of the pelt.
It can be seen from application example 2 and comparative application examples 3 to 5 that under the action of the leather water-soaking agent, the unhairing effect of protease can be effectively improved, the process time is shortened, and the time is shortened by 10 to 15 hours.
The invention also examines the leather water-immersing agent of the embodiment 1 which is used independently, namely, protease is not added, and the result shows that the leather water-immersing agent has dehairing effect while immersing. The leather water-dipping agent has good permeability and high water return rate, and the leather water-dipping agent contains the surfactant, so that the leather water-dipping agent has a certain removal effect on grease and protein in hair follicles, and therefore, has a certain dehairing effect in the water-dipping process, and the hair removal rate reaches 78% at the highest time when different leathers are used for multiple experiments.
When the leather water-soaking agent is mixed with protease for use, the unhairing efficiency of the protease can be improved, the unhairing time is shortened, and the unhairing efficiency is high.
Although the foregoing embodiments have been described in some, but not all, embodiments of the invention, it should be understood that other embodiments may be devised in accordance with the embodiments of the invention without departing from the spirit and scope of the invention.
Claims (10)
1. The leather water-dipping agent is characterized by comprising the following components in percentage by mass: 0.05 to 0.18 percent of sulfonated diisooctyl succinate sodium salt, 3 to 10 percent of sodium dodecyl benzene sulfonate, 0.03 to 0.15 percent of dodecyl dimethyl benzyl ammonium chloride, 2 to 5 percent of absolute ethyl alcohol and 85 to 94.92 percent of water.
2. The leather impregnating agent according to claim 1, wherein the mass fraction of the sodium diisooctyl sulfosuccinate salt in the leather impregnating agent is 0.08-0.15%.
3. The leather impregnating agent as claimed in claim 1, wherein the mass fraction of sodium dodecyl benzene sulfonate in the leather impregnating agent is 5-8%.
4. The leather impregnating agent according to claim 1, wherein the mass fraction of dodecyl dimethyl benzyl ammonium chloride in the leather impregnating agent is 0.05-0.12%.
5. The leather impregnating agent as claimed in claim 1, comprising the following components in mass percent: 0.08 to 0.15 percent of sulfonated diisooctyl succinate sodium salt, 5 to 8 percent of sodium dodecyl benzene sulfonate, 0.05 to 0.12 percent of dodecyl dimethyl benzyl ammonium chloride, 2 to 5 percent of absolute ethyl alcohol and 87 to 92.87 percent of water.
6. The method for preparing the leather impregnating agent as claimed in any one of claims 1 to 5, comprising the following steps:
firstly mixing sodium dodecyl benzene sulfonate, water and partial absolute ethyl alcohol to obtain sodium dodecyl benzene sulfonate solution;
and (3) carrying out second mixing on the sodium dodecyl benzene sulfonate solution, the sodium diisooctyl sulfosuccinate, the dodecyl dimethyl benzyl ammonium chloride and the residual absolute ethyl alcohol to obtain the leather water-immersing agent.
7. The method according to claim 6, wherein the first mixing time is 5 to 10 minutes.
8. The method according to claim 6, wherein the second mixing time is 8 to 15 minutes.
9. The use of the leather impregnating agent according to any one of claims 1 to 5 or the leather impregnating agent obtained by the preparation method according to any one of claims 6 to 8 in leather impregnating, characterized in that the leather impregnating agent is used in an amount of 0.2 to 1.0% by mass of leather.
10. A method of immersing, comprising the steps of: mixing leather, water and a leather soaking agent, and then stirring and soaking in sequence, wherein the leather soaking agent is the leather soaking agent according to any one of claims 1-5.
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