CN115948624A - Surface finishing wax emulsion for leather - Google Patents
Surface finishing wax emulsion for leather Download PDFInfo
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- CN115948624A CN115948624A CN202211546572.0A CN202211546572A CN115948624A CN 115948624 A CN115948624 A CN 115948624A CN 202211546572 A CN202211546572 A CN 202211546572A CN 115948624 A CN115948624 A CN 115948624A
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- wax
- wax emulsion
- leather
- lanonol
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- 239000000839 emulsion Substances 0.000 title claims abstract description 72
- 239000010985 leather Substances 0.000 title claims abstract description 70
- 239000001993 wax Substances 0.000 claims abstract description 121
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 84
- 239000004166 Lanolin Substances 0.000 claims abstract description 46
- 229940039717 lanolin Drugs 0.000 claims abstract description 46
- 235000019388 lanolin Nutrition 0.000 claims abstract description 46
- 239000002253 acid Substances 0.000 claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 42
- 239000002994 raw material Substances 0.000 claims abstract description 41
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000003607 modifier Substances 0.000 claims abstract description 31
- 239000000126 substance Substances 0.000 claims abstract description 28
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 26
- 150000002148 esters Chemical class 0.000 claims abstract description 26
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 19
- HTUIWRWYYVBCFT-UHFFFAOYSA-N propyl hexanoate Chemical compound CCCCCC(=O)OCCC HTUIWRWYYVBCFT-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000007127 saponification reaction Methods 0.000 claims abstract description 11
- LERPQJNGDVCXSI-UHFFFAOYSA-N 2-[decanoyl(methyl)amino]acetic acid Chemical compound CCCCCCCCCC(=O)N(C)CC(O)=O LERPQJNGDVCXSI-UHFFFAOYSA-N 0.000 claims abstract description 9
- BAPJBEWLBFYGME-UHFFFAOYSA-N acrylic acid methyl ester Natural products COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims abstract description 9
- ZNBYZIRVKBMNRF-UHFFFAOYSA-N ethenyl(methyl)phosphinic acid Chemical compound CP(O)(=O)C=C ZNBYZIRVKBMNRF-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 68
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 24
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 17
- 238000004821 distillation Methods 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 17
- XZOYHFBNQHPJRQ-UHFFFAOYSA-N 7-methyloctanoic acid Chemical compound CC(C)CCCCCC(O)=O XZOYHFBNQHPJRQ-UHFFFAOYSA-N 0.000 claims description 16
- 235000021314 Palmitic acid Nutrition 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 claims description 16
- -1 polymethylsiloxane Polymers 0.000 claims description 14
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 14
- 238000002360 preparation method Methods 0.000 claims description 13
- 239000004203 carnauba wax Substances 0.000 claims description 12
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 11
- 229940057995 liquid paraffin Drugs 0.000 claims description 11
- BYKNGMLDSIEFFG-UHFFFAOYSA-N 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptan-1-ol Chemical compound OCC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)F BYKNGMLDSIEFFG-UHFFFAOYSA-N 0.000 claims description 10
- VMAWODUEPLAHOE-UHFFFAOYSA-N 2,4,6,8-tetrakis(ethenyl)-2,4,6,8-tetramethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane Chemical compound C=C[Si]1(C)O[Si](C)(C=C)O[Si](C)(C=C)O[Si](C)(C=C)O1 VMAWODUEPLAHOE-UHFFFAOYSA-N 0.000 claims description 10
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 10
- 238000006297 dehydration reaction Methods 0.000 claims description 10
- 239000004200 microcrystalline wax Substances 0.000 claims description 10
- 235000019808 microcrystalline wax Nutrition 0.000 claims description 10
- 229920000570 polyether Polymers 0.000 claims description 10
- 229920002545 silicone oil Polymers 0.000 claims description 10
- ZORQXIQZAOLNGE-UHFFFAOYSA-N 1,1-difluorocyclohexane Chemical group FC1(F)CCCCC1 ZORQXIQZAOLNGE-UHFFFAOYSA-N 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 claims description 7
- 239000001818 polyoxyethylene sorbitan monostearate Substances 0.000 claims description 7
- 235000010989 polyoxyethylene sorbitan monostearate Nutrition 0.000 claims description 7
- 239000001593 sorbitan monooleate Substances 0.000 claims description 7
- 235000011069 sorbitan monooleate Nutrition 0.000 claims description 7
- 229940035049 sorbitan monooleate Drugs 0.000 claims description 7
- 210000002268 wool Anatomy 0.000 claims description 6
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 0.000 claims description 3
- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 claims description 3
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 3
- 229920000053 polysorbate 80 Polymers 0.000 claims description 3
- 239000001587 sorbitan monostearate Substances 0.000 claims description 3
- 235000011076 sorbitan monostearate Nutrition 0.000 claims description 3
- 229940035048 sorbitan monostearate Drugs 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 15
- 238000005886 esterification reaction Methods 0.000 abstract description 13
- 230000032050 esterification Effects 0.000 abstract description 8
- 150000001875 compounds Chemical class 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- HVYWMOMLDIMFJA-DPAQBDIFSA-N cholesterol Chemical compound C1C=C2C[C@@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2 HVYWMOMLDIMFJA-DPAQBDIFSA-N 0.000 description 4
- BQPPJGMMIYJVBR-UHFFFAOYSA-N (10S)-3c-Acetoxy-4.4.10r.13c.14t-pentamethyl-17c-((R)-1.5-dimethyl-hexen-(4)-yl)-(5tH)-Delta8-tetradecahydro-1H-cyclopenta[a]phenanthren Natural products CC12CCC(OC(C)=O)C(C)(C)C1CCC1=C2CCC2(C)C(C(CCC=C(C)C)C)CCC21C BQPPJGMMIYJVBR-UHFFFAOYSA-N 0.000 description 3
- CHGIKSSZNBCNDW-UHFFFAOYSA-N (3beta,5alpha)-4,4-Dimethylcholesta-8,24-dien-3-ol Natural products CC12CCC(O)C(C)(C)C1CCC1=C2CCC2(C)C(C(CCC=C(C)C)C)CCC21 CHGIKSSZNBCNDW-UHFFFAOYSA-N 0.000 description 3
- XYTLYKGXLMKYMV-UHFFFAOYSA-N 14alpha-methylzymosterol Natural products CC12CCC(O)CC1CCC1=C2CCC2(C)C(C(CCC=C(C)C)C)CCC21C XYTLYKGXLMKYMV-UHFFFAOYSA-N 0.000 description 3
- FPTJELQXIUUCEY-UHFFFAOYSA-N 3beta-Hydroxy-lanostan Natural products C1CC2C(C)(C)C(O)CCC2(C)C2C1C1(C)CCC(C(C)CCCC(C)C)C1(C)CC2 FPTJELQXIUUCEY-UHFFFAOYSA-N 0.000 description 3
- BKLIAINBCQPSOV-UHFFFAOYSA-N Gluanol Natural products CC(C)CC=CC(C)C1CCC2(C)C3=C(CCC12C)C4(C)CCC(O)C(C)(C)C4CC3 BKLIAINBCQPSOV-UHFFFAOYSA-N 0.000 description 3
- LOPKHWOTGJIQLC-UHFFFAOYSA-N Lanosterol Natural products CC(CCC=C(C)C)C1CCC2(C)C3=C(CCC12C)C4(C)CCC(C)(O)C(C)(C)C4CC3 LOPKHWOTGJIQLC-UHFFFAOYSA-N 0.000 description 3
- CAHGCLMLTWQZNJ-UHFFFAOYSA-N Nerifoliol Natural products CC12CCC(O)C(C)(C)C1CCC1=C2CCC2(C)C(C(CCC=C(C)C)C)CCC21C CAHGCLMLTWQZNJ-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- QBSJHOGDIUQWTH-UHFFFAOYSA-N dihydrolanosterol Natural products CC(C)CCCC(C)C1CCC2(C)C3=C(CCC12C)C4(C)CCC(C)(O)C(C)(C)C4CC3 QBSJHOGDIUQWTH-UHFFFAOYSA-N 0.000 description 3
- CAHGCLMLTWQZNJ-RGEKOYMOSA-N lanosterol Chemical compound C([C@]12C)C[C@@H](O)C(C)(C)[C@H]1CCC1=C2CC[C@]2(C)[C@H]([C@H](CCC=C(C)C)C)CC[C@@]21C CAHGCLMLTWQZNJ-RGEKOYMOSA-N 0.000 description 3
- 229940058690 lanosterol Drugs 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000011203 carbon fibre reinforced carbon Chemical group 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 235000012000 cholesterol Nutrition 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 125000001153 fluoro group Chemical group F* 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- IHSOXTPEDUKGBD-FYWRMAATSA-N (9e)-9-hydroxyiminofluorene-4-carboxylic acid Chemical compound C1=CC=C(C(O)=O)C2=C1C(=N/O)/C1=CC=CC=C12 IHSOXTPEDUKGBD-FYWRMAATSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000007933 aliphatic carboxylic acids Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The invention discloses a surface finishing wax emulsion for leather, which is prepared by taking lanolin alcohol with specific hydroxyl value, acid value and saponification value as raw materials and carrying out esterification reaction with alkyl acid, wherein a modifier is also added in the esterification process, and is a mixture of 2-acetylamino-3- (2,5-difluorophenyl) methyl acrylate, methyl vinyl phosphinic acid and N-decanoyl-N-methylglycine; then, modifying the lanonol ester, adding substances such as propyl caproate and the like to compound to obtain the lanonol wax; optimizing the lanolin alcohol wax, and adding an emulsifier and an accelerator to prepare a wax emulsion; the leather coated with the wax emulsion has strong waterproofness and tearing strength, and simultaneously improves the temperature resistance, so that the coated leather can resist high temperature and still has strong waterproofness and tearing strength after being placed at high temperature for a period of time; the wax emulsion prepared by the invention can improve the hand feeling of leather and the glossiness and the waterproofness of the leather surface.
Description
Technical Field
The invention relates to the technical field of leather chemical industry, in particular to a surface finishing wax emulsion for leather.
Background
Leather finishing is an operation process of coating a layer of colored or colorless natural or synthetic polymer film on the surface of dried and finished leather, and can cover the original defects of the raw leather or the defects caused in the processing process so as to improve the quality of the coating and even the leather. The finishing is an important operation for beautifying the appearance quality of the leather, and aims to ensure that the surface of the leather is smooth and glossy and has uniform color; meanwhile, the additional value of the leather can be further provided; for example, wax substances, such as palm wax, liquid paraffin and the like, are commonly used as leather finishing agents at present, and can improve the adhesion of the leather during stacking and the plate separation during ironing; in addition, wax can also be used to improve the hand of leather, adjust the gloss of the leather surface and improve the water resistance of leather.
For example, the leather wax printing method of Chinese patent with application number CN90103042.2 discloses that various performances of leather are improved by wax printing, and moire patterns with artistic effect can be printed on the leather; however, the process is complex, multiple dyeing is needed, and the surface gloss and water resistance of the dyed leather are not good, so that the high requirements of modern people cannot be met.
Furthermore, the method for producing the double-layer oil-wax waterproof leather with the application number of CN106957932A uses relatively common wax and additives, so that the leather has good waterproof property and wet rub resistance, and also has strong tearing strength; however, in practical use, a certain problem is found, namely, along with global warming, the temperature of most areas is higher and higher at present, the ground temperature in summer in south can reach more than 50 ℃, the water resistance and the mechanical strength of the leather can be greatly reduced under a long-time high-temperature environment, the requirement of practical application cannot be met, and the development of wax substances and leather products is limited to a certain extent!
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a surface finishing wax emulsion for leather, which takes lanonol ester as a main raw material, can improve the waterproof performance and the mechanical performance of the leather surface, and still has strong waterproof performance and mechanical performance after long-time high temperature.
In order to achieve the purpose, the invention provides the following technical scheme: a surface finishing wax emulsion for leather comprises the following substances in parts by weight:
10-20 parts of wool alcohol wax;
2-10 parts of an emulsifier;
1-3 parts of an accelerant;
70-90 parts of deionized water;
the lanolin alcohol wax comprises;
50-80 parts of lanonol ester; 20-30 parts of propyl caproate; 10-15 parts of palm wax; 20-30 parts of liquid paraffin; 5-15 parts of microcrystalline wax; 10-20 parts of No. 10 white oil; 2-5 parts of polyether modified silicone oil.
As a further improvement of the invention, the preparation method of the lanolin alcohol wax comprises the following steps: preparing raw materials according to the set weight part, adding the raw materials into a reactor, adjusting the temperature of the reactor to 80-100 ℃ to melt the raw materials, starting stirring to uniformly stir the system, and keeping stirring for 40-80min; then continuously cooling to 50-70 ℃, filtering and discharging to obtain the lanonol wax.
As a further improvement of the invention, the lanonol ester comprises the following substances in parts by weight: 8-12 parts of lanonol; 6-10 parts of alkyl acid; 1-3 parts of a modifier; the alkyl acid is a mixture of palmitic acid and isononanoic acid, and the mass ratio of the palmitic acid to the isononanoic acid is 1-3:1.
As a further improvement of the invention, the lanolin alcohol is a lanolin alcohol with a high hydroxyl value, the hydroxyl value is 120-160 mgKOH/g, the acid value is less than 5mgKOH/g, and the saponification value is less than 10mgKOH/g.
As a further improvement of the invention, the modifier is a mixture of methyl 2-acetylamino-3- (2,5-difluorophenyl) acrylate, methylvinylphosphinic acid and N-decanoyl-N-methylglycine in a mass ratio of 3.
As a further improvement of the invention, the preparation method of the lanonol ester comprises the following steps: preparing raw materials according to the set weight part, adding lanolin alcohol, alkyl acid and a modifier into a reactor, adjusting the temperature of the reactor to 70-80 ℃ to enable the reactor to be molten, then adding a catalyst p-toluenesulfonic acid accounting for 0.5-0.8% of the total mass fraction, and uniformly stirring; then heating the system to 130-160 ℃, keeping stirring, and carrying out reduced pressure distillation dehydration reaction for 4-6 h; stopping reduced pressure distillation, and cooling to 60-70 ℃ to obtain the lanonol ester.
As a further improvement of the invention, the system pressure is less than or equal to 0.02MPa during the reduced pressure distillation dehydration; the acid value of the system after the reduced pressure distillation dehydration reaction is less than or equal to 15.0mgKOH/g.
As a further improvement of the invention, the promoter is a mixture of lauryl polymethylsiloxane, dodecafluoro heptanol and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane in a mass ratio of 2.
As a further improvement of the invention, the emulsifier is a mixture of a hydrophilic emulsifier and a lipophilic emulsifier, and the mass ratio of the hydrophilic emulsifier to the lipophilic emulsifier is 4:1-9:1;
the hydrophilic emulsifier is polyoxyethylene sorbitan monooleate and/or polyoxyethylene sorbitan monostearate; the lipophilic emulsifier is sorbitan monooleate and/or sorbitan monostearate.
As a further improvement of the invention, the preparation method of the wax emulsion comprises the following steps: preparing raw materials according to the set weight part, adding lanolin alcohol wax, an emulsifier and an accelerant into a reactor, adjusting the temperature of the reactor to 75-90 ℃, and then starting stirring to uniformly stir the system; then adding deionized water at 70-80 ℃, heating the system to 90-95 ℃, controlling the stirring speed to be 200-300 r/min, and keeping stirring for 60min; cooling to 30-45 ℃, filtering and discharging to obtain the wax emulsion.
The invention has the beneficial effects that: by using as a starting material a lanolin alcohol of a specific hydroxyl number, acid number and saponification number, which is a complex mixture containing monomeric alcohols of various carbon chain lengths; the lanolin alcohol ester is prepared by researching that the lanolin alcohol ester can be subjected to esterification reaction with alkyl acid to further increase molecular weight, and in order to improve the esterification completion degree, two kinds of alkyl acid (palmitic acid and isononanoic acid) with carbon chain length are preferably selected, and the relative content is optimized; the modified wax emulsion contains various carbon chain structures, further purification and separation are not needed, and the coating effect of the prepared modified wax emulsion is better than that of a single structure; preferably, a modifier is also added in the esterification process, the modifier is a mixture of 2-acetylamino-3- (2,5-difluorophenyl) methyl acrylate, methyl vinyl phosphinic acid and N-decanoyl-N-methylglycine, and the mixture has functional groups such as carboxyl, carbon-carbon double bond, fluorine group and the like, so that the mixture can participate in the esterification reaction to fully ensure the esterification degree, and can be favorable for improving the finishing effect of the modified wax emulsion to ensure that the finished leather has more excellent waterproofness and tearing strength.
The application effect of the lanolin alcohol ester is further modified in the first reaction stage, and propyl caproate, palm wax, liquid paraffin, microcrystalline wax, no. 10 white oil and polyether modified silicone oil are preferably selected and compounded to obtain the lanolin alcohol wax.
The invention emulsifies the lanolin alcohol wax in the second stage, wherein one key point of the invention is that a lipophilic emulsifier and a hydrophilic emulsifier are simultaneously selected in the selection of the emulsifier, and the two different types of emulsifiers form a composite emulsifier system, so that the lanolin alcohol wax can be uniformly dispersed in the whole system. The prepared wax emulsion is placed in a room temperature environment for more than 1 year, the phenomena of layering or precipitation and the like are avoided, the stability is good, and the quality guarantee period is long; meanwhile, the wax emulsion is stable and does not delaminate after being centrifuged for 60min at the rotating speed of 3500 r/min;
in addition, an accelerator is added into the wax emulsion, and the accelerator is a mixture of lauryl polymethylsiloxane, dodecafluoro heptanol and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane; under the synergistic effect of the three substances, the finishing effect of the modified wax emulsion can be further improved, so that the finished leather has stronger water resistance and tearing strength, and the temperature resistance is improved, so that the finished leather can resist high temperature and still has strong water resistance and tearing strength after being placed at the high temperature for a period of time;
the wax emulsion prepared by the invention is white emulsion in appearance, has good finishing effect, and can improve the hand feeling of leather and the glossiness and water resistance of leather surface.
Detailed Description
Example 1
The method comprises the following steps: the lanonol ester comprises the following substances in parts by weight: 10 parts of lanonol; 8 parts of alkyl acid; 2 parts of a modifier;
wherein the lanonol is lanonol with high hydroxyl value, the hydroxyl value is 140mgKOH/g, the acid value is less than 5mgKOH/g, and the saponification value is less than 10mgKOH/g; the alkyl acid is a mixture of palmitic acid and isononanoic acid, and the mass ratio of the palmitic acid to the isononanoic acid is 3:1; the modifier is a mixture of 2-acetylamino-3- (2,5-difluorophenyl) methyl acrylate, methyl vinyl phosphinic acid and N-decanoyl-N-methylglycine, and the mass ratio of the modifier is 3;
step two: preparing raw materials according to the set weight part, adding lanolin alcohol, alkyl acid and a modifier into a reactor, adjusting the temperature of the reactor to 80 ℃ to enable the reactor to be molten, then adding a catalyst p-toluenesulfonic acid accounting for 0.5 percent of the total mass fraction, and uniformly stirring; then heating the system to 140 ℃, keeping stirring, and carrying out reduced pressure distillation dehydration reaction for 5h (at the moment, the system pressure is controlled to be 0.01 MPa); stopping reduced pressure distillation, cooling to 60 deg.C to obtain lanonol ester (acid value of the system should be no more than 15.0 mgKOH/g);
step three: the lanonol wax comprises the following substances in parts by weight:
60 parts of lanonol ester; 25 parts of propyl caproate; 12 parts of palm wax; 25 parts of liquid paraffin; 10 parts of microcrystalline wax; 15 parts of No. 10 white oil; and 3 parts of polyether modified silicone oil.
Step four: adding the above raw materials into a reactor, adjusting the temperature of the reactor to 90 deg.C to melt the raw materials, starting stirring to make the system uniformly stirred, and keeping stirring for 60min; then continuously cooling to 60 ℃, filtering and discharging to obtain the lanonol wax;
step five: a surface finishing wax emulsion for leather comprises the following substances in parts by weight:
15 parts of lanolin alcohol wax; 4 parts of an emulsifier; 2 parts of an accelerator; 80 parts of deionized water;
the emulsifier is hydrophilic emulsifier; the hydrophilic emulsifier is polyoxyethylene sorbitan monooleate; the accelerator is lauryl polymethylsiloxane.
The preparation method of the wax emulsion comprises the following steps: preparing raw materials according to the set weight part, adding lanolin alcohol wax, an emulsifier and an accelerant into a reactor, adjusting the temperature of the reactor to 80 ℃, and then starting stirring to uniformly stir the system; then adding deionized water at 75 ℃, heating the system to 95 ℃, controlling the stirring speed to be 200r/min, and keeping stirring for 60min; cooling to 40 ℃, filtering and discharging to obtain the wax emulsion.
Example 2:
the method comprises the following steps: the lanonol ester comprises the following substances in parts by weight: 10 parts of lanonol; 8 parts of alkyl acid; 2 parts of a modifier;
wherein the lanonol is lanonol with high hydroxyl value, the hydroxyl value is 140mgKOH/g, the acid value is less than 5mgKOH/g, and the saponification value is less than 10mgKOH/g; the alkyl acid is a mixture of palmitic acid and isononanoic acid, and the mass ratio of the palmitic acid to the isononanoic acid is 3:1; the modifier is 2-acetylamino-3- (2,5-difluorophenyl) methyl acrylate;
step two: preparing raw materials according to the set weight portion, adding lanolin alcohol, alkyl acid and a modifier into a reactor, adjusting the temperature of the reactor to 80 ℃ to enable the raw materials to be molten, then adding a catalyst p-toluenesulfonic acid accounting for 0.5% of the total mass fraction, and uniformly stirring; then heating the system to 140 ℃, keeping stirring, and carrying out reduced pressure distillation dehydration reaction for 5h (at the moment, the system pressure is controlled to be 0.01 MPa); stopping reduced pressure distillation, cooling to 60 deg.C to obtain lanonol ester (acid value of the system should be no more than 15.0 mgKOH/g);
step three: the lanonol wax comprises the following substances in parts by weight:
60 parts of lanonol ester; 25 parts of propyl caproate; 12 parts of palm wax; 25 parts of liquid paraffin; 10 parts of microcrystalline wax; 15 parts of No. 10 white oil; and 3 parts of polyether modified silicone oil.
Step four: adding the above raw materials into a reactor, adjusting the temperature of the reactor to 90 deg.C to melt the raw materials, starting stirring to make the system uniformly stirred, and keeping stirring for 60min; then continuously cooling to 60 ℃, filtering and discharging to obtain the lanonol wax;
step five: a surface finishing wax emulsion for leather comprises the following substances in parts by weight:
15 parts of lanolin alcohol wax; 4 parts of an emulsifier; 2 parts of an accelerator; 80 parts of deionized water;
the emulsifier is a lipophilic emulsifier; the lipophilic emulsifier is sorbitan monostearate; the accelerator is a mixture of lauryl polymethylsiloxane, dodecafluoroheptanol and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane, and the mass ratio of the accelerator to the accelerator is 2.
The preparation method of the wax emulsion comprises the following steps: preparing raw materials according to the set weight portion, adding wool alcohol wax, an emulsifier and an accelerant into a reactor, adjusting the temperature of the reactor to 80 ℃, and then starting stirring to uniformly stir the system; then adding deionized water with the temperature of 75 ℃, heating the system to 95 ℃, controlling the stirring speed to be 200r/min, and keeping stirring for 60min; cooling to 40 ℃, filtering and discharging to obtain the wax emulsion.
Example 3:
the method comprises the following steps: the lanonol ester comprises the following substances in parts by weight: 10 parts of lanonol; 8 parts of alkyl acid; 2 parts of a modifier;
wherein the lanonol is lanonol with high hydroxyl value, the hydroxyl value is 140mgKOH/g, the acid value is less than 5mgKOH/g, and the saponification value is less than 10mgKOH/g;
the alkyl acid is a mixture of palmitic acid and isononanoic acid, and the mass ratio of the palmitic acid to the isononanoic acid is 3:1; the modifier is a mixture of 2-acetylamino-3- (2,5-difluorophenyl) methyl acrylate, methyl vinyl phosphinic acid and N-decanoyl-N-methylglycine, and the mass ratio of the modifier is 3;
step two: preparing raw materials according to the set weight portion, adding lanolin alcohol, alkyl acid and a modifier into a reactor, adjusting the temperature of the reactor to 80 ℃ to enable the raw materials to be molten, then adding a catalyst p-toluenesulfonic acid accounting for 0.5% of the total mass fraction, and uniformly stirring; then heating the system to 140 ℃, keeping stirring, and carrying out reduced pressure distillation dehydration reaction for 5h (at the moment, the system pressure is controlled to be 0.01 MPa); stopping reduced pressure distillation, cooling to 60 deg.C to obtain lanonol ester (acid value of the system should be no more than 15.0 mgKOH/g);
step three: the lanonol wax comprises the following substances in parts by weight:
60 parts of lanonol ester; 25 parts of propyl caproate; 12 parts of palm wax; 25 parts of liquid paraffin; 10 parts of microcrystalline wax; 15 parts of No. 10 white oil; and 3 parts of polyether modified silicone oil.
Step four: adding the above raw materials into a reactor, adjusting the temperature of the reactor to 90 deg.C to melt the raw materials, starting stirring to make the system uniformly stirred, and keeping stirring for 60min; then continuously cooling to 60 ℃, filtering and discharging to obtain the lanonol wax;
step five: a surface finishing wax emulsion for leather comprises the following substances in parts by weight:
15 parts of lanolin alcohol wax; 4 parts of an emulsifier; 2 parts of an accelerator; 80 parts of deionized water;
wherein the emulsifier is a mixture of a hydrophilic emulsifier and a lipophilic emulsifier, and the mass ratio of the emulsifier to the hydrophilic emulsifier is 6:1;
the hydrophilic emulsifier is polyoxyethylene sorbitan monostearate; the lipophilic emulsifier is sorbitan monooleate; the accelerator is a mixture of lauryl polymethylsiloxane, dodecafluoroheptanol and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane, and the mass ratio of the accelerator to the accelerator is 2.
The preparation method of the wax emulsion comprises the following steps: preparing raw materials according to the set weight part, adding lanolin alcohol wax, an emulsifier and an accelerant into a reactor, adjusting the temperature of the reactor to 80 ℃, and then starting stirring to uniformly stir the system; then adding deionized water at 75 ℃, heating the system to 95 ℃, controlling the stirring speed to be 200r/min, and keeping stirring for 60min; cooling to 40 ℃, filtering and discharging to obtain the wax emulsion.
Example 4:
the method comprises the following steps: the lanonol ester comprises the following substances in parts by weight: 8 parts of lanonol; 10 parts of alkyl acid; 1 part of a modifier;
wherein the lanonol is a lanonol with high hydroxyl value, the hydroxyl value is 140mgKOH/g, the acid value is less than 5mgKOH/g, and the saponification value is less than 10mgKOH/g;
the alkyl acid is a mixture of palmitic acid and isononanoic acid, and the mass ratio of the palmitic acid to the isononanoic acid is 2:1; the modifier is a mixture of 2-acetylamino-3- (2,5-difluorophenyl) methyl acrylate, methyl vinyl phosphinic acid and N-decanoyl-N-methylglycine, and the mass ratio of the modifier is 3;
step two: preparing raw materials according to the set weight portion, adding lanolin alcohol, alkyl acid and a modifier into a reactor, adjusting the temperature of the reactor to 70 ℃ to enable the raw materials to be molten, then adding a catalyst p-toluenesulfonic acid accounting for 0.7% of the total mass fraction, and uniformly stirring; then heating the system to 140 ℃, keeping stirring, and carrying out reduced pressure distillation dehydration reaction for 5h (at the moment, the system pressure is controlled to be 0.01 MPa); stopping reduced pressure distillation, and cooling to 65 deg.C to obtain lanonol ester (acid value of the system should be no more than 15.0 mgKOH/g);
step three: the lanonol wax comprises the following substances in parts by weight:
50 parts of lanonol ester; 30 parts of propyl caproate; 10 parts of palm wax; 30 parts of liquid paraffin; 5 parts of microcrystalline wax; 20 parts of No. 10 white oil; and 2 parts of polyether modified silicone oil.
Step four: adding the above raw materials into a reactor, adjusting the temperature of the reactor to 100 deg.C to melt the raw materials, stirring the system uniformly, and keeping stirring for 40min; then continuously cooling to 50 ℃, filtering and discharging to obtain the lanonol wax;
step five: a surface finishing wax emulsion for leather comprises the following substances in parts by weight:
10 parts of lanolin alcohol wax; 2 parts of an emulsifier; 1 part of an accelerator; 85 parts of deionized water;
wherein the emulsifier is a mixture of a hydrophilic emulsifier and a lipophilic emulsifier, and the mass ratio of the emulsifier to the hydrophilic emulsifier is 6:1;
the hydrophilic emulsifier is polyoxyethylene sorbitan monostearate; the lipophilic emulsifier is sorbitan monooleate; the promoter is a mixture of lauryl polymethylsiloxane, dodecafluoroheptanol and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane, and the mass ratio of the promoter is 2.
The preparation method of the wax emulsion comprises the following steps: preparing raw materials according to the set weight part, adding lanolin alcohol wax, an emulsifier and an accelerant into a reactor, adjusting the temperature of the reactor to 80 ℃, and then starting stirring to uniformly stir the system; then adding deionized water at 75 ℃, heating the system to 90 ℃, controlling the stirring speed to be 300r/min, and keeping stirring for 60min; cooling to 30 ℃, filtering and discharging to obtain the wax emulsion.
Example 5:
the method comprises the following steps: the lanonol ester comprises the following substances in parts by weight: 12 parts of lanonol; 6 parts of alkyl acid; 3 parts of a modifier;
wherein the lanonol is lanonol with high hydroxyl value, the hydroxyl value is 140mgKOH/g, the acid value is less than 5mgKOH/g, and the saponification value is less than 10mgKOH/g;
the alkyl acid is a mixture of palmitic acid and isononanoic acid, and the mass ratio of the palmitic acid to the isononanoic acid is 2:1; the modifier is a mixture of 2-acetylamino-3- (2,5-difluorophenyl) methyl acrylate, methyl vinyl phosphinic acid and N-decanoyl-N-methylglycine, and the mass ratio of the modifier is 3;
step two: preparing raw materials according to the set weight part, adding lanolin alcohol, alkyl acid and a modifier into a reactor, adjusting the temperature of the reactor to 70 ℃ to enable the reactor to be molten, then adding a catalyst p-toluenesulfonic acid accounting for 0.7 percent of the total mass fraction, and uniformly stirring; then heating the system to 160 ℃, keeping stirring, and carrying out reduced pressure distillation dehydration reaction for 4h (at the moment, the system pressure is controlled to be 0.01 MPa); stopping reduced pressure distillation, and cooling to 65 deg.C to obtain lanonol ester (acid value of the system should be no more than 15.0 mgKOH/g);
step three: the lanonol wax comprises the following substances in parts by weight:
80 parts of lanonol ester; 20 parts of propyl caproate; 15 parts of palm wax; 20 parts of liquid paraffin; 15 parts of microcrystalline wax; 10 parts of No. 10 white oil; and 4 parts of polyether modified silicone oil.
Step four: adding the above raw materials into a reactor, adjusting the temperature of the reactor to 80 deg.C to melt the raw materials, stirring the system uniformly, and keeping stirring for 80min; then continuously cooling to 55 ℃, filtering and discharging to obtain the lanonol wax;
step five: a surface finishing wax emulsion for leather comprises the following substances in parts by weight:
20 parts of wool alcohol wax; 8 parts of an emulsifier; 3 parts of an accelerant; 75 parts of deionized water;
wherein the emulsifier is a mixture of a hydrophilic emulsifier and a lipophilic emulsifier, and the mass ratio of the emulsifier to the hydrophilic emulsifier is 6:1;
the hydrophilic emulsifier is polyoxyethylene sorbitan monostearate; the lipophilic emulsifier is sorbitan monooleate; the accelerator is a mixture of lauryl polymethylsiloxane, dodecafluoroheptanol and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane, and the mass ratio of the accelerator to the accelerator is 2.
The preparation method of the wax emulsion comprises the following steps: preparing raw materials according to the set weight part, adding lanolin alcohol wax, an emulsifier and an accelerant into a reactor, adjusting the temperature of the reactor to 80 ℃, and then starting stirring to uniformly stir the system; then adding deionized water with the temperature of 75 ℃, heating the system to 95 ℃, controlling the stirring speed to be 250r/min, and keeping stirring for 60min; cooling to 30 ℃, filtering and discharging to obtain the wax emulsion.
Comparative example 1
The method comprises the following steps: the lanonol wax comprises the following substances in parts by weight:
60 parts of lanonol; 25 parts of propyl caproate; 12 parts of palm wax; 25 parts of liquid paraffin; 10 parts of microcrystalline wax; 15 parts of No. 10 white oil; 3 parts of polyether modified silicone oil.
Wherein the lanonol is a lanonol with high hydroxyl value, the hydroxyl value is 140mgKOH/g, the acid value is less than 5mgKOH/g, and the saponification value is less than 10mgKOH/g;
step two: adding the above raw materials into a reactor, adjusting the temperature of the reactor to 90 deg.C to melt the raw materials, starting stirring to make the system uniformly stirred, and keeping stirring for 60min; then continuously cooling to 60 ℃, filtering and discharging to obtain the lanonol wax;
step three: a surface finishing wax emulsion for leather comprises the following substances in parts by weight:
15 parts of lanolin alcohol wax; 4 parts of an emulsifier; 2 parts of an accelerator; 80 parts of deionized water;
wherein the emulsifier is a mixture of a hydrophilic emulsifier and a lipophilic emulsifier, and the mass ratio of the emulsifier to the hydrophilic emulsifier is 6:1;
the hydrophilic emulsifier is polyoxyethylene sorbitan monostearate; the lipophilic emulsifier is sorbitan monooleate; the accelerator is a mixture of lauryl polymethylsiloxane, dodecafluoroheptanol and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane, and the mass ratio of the accelerator to the accelerator is 2.
The preparation method of the wax emulsion comprises the following steps: preparing raw materials according to the set weight part, adding lanolin alcohol wax, an emulsifier and an accelerant into a reactor, adjusting the temperature of the reactor to 80 ℃, and then starting stirring to uniformly stir the system; then adding deionized water with the temperature of 75 ℃, heating the system to 95 ℃, controlling the stirring speed to be 200r/min, and keeping stirring for 60min; cooling to 30-45 ℃, filtering and discharging to obtain the wax emulsion.
Comparative example 2
A surface finishing wax emulsion for leather comprises the following substances in parts by weight:
15 parts of lanolin alcohol wax; 4 parts of an emulsifier; 2 parts of an accelerator; 80 parts of deionized water;
wherein the lanolin alcohol wax is palm wax;
wherein the emulsifier is a mixture of a hydrophilic emulsifier and a lipophilic emulsifier, and the mass ratio of the emulsifier to the hydrophilic emulsifier is 6:1;
the hydrophilic emulsifier is polyoxyethylene sorbitan monostearate; the lipophilic emulsifier is sorbitan monooleate; the accelerator is a mixture of lauryl polymethylsiloxane, dodecafluoroheptanol and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane, and the mass ratio of the accelerator to the accelerator is 2.
The preparation method of the wax emulsion comprises the following steps: preparing raw materials according to the set weight part, adding lanolin alcohol wax, an emulsifier and an accelerant into a reactor, adjusting the temperature of the reactor to 80 ℃, and then starting stirring to uniformly stir the system; then adding deionized water at 75 ℃, heating the system to 95 ℃, controlling the stirring speed to be 200r/min, and keeping stirring for 60min; cooling to 30-45 ℃, filtering and discharging to obtain the wax emulsion.
Performance test
The wax emulsions prepared in examples 1 to 5 and comparative examples 1 and 2 were used in leather finishing to examine the hand and gloss of the coating. The method is described in Wei Shilin, tannery technology, light industrial press of China, 2005 "
| Hand feeling | Gloss (E) | |
| Example 1 | Strong moistening feeling | Uniform brightness |
| Example 2 | Strong moist feeling | Uniform brightness |
| Example 3 | Moist feeling and fullness | Uniform brightness |
| Example 4 | Strong moist feeling | Uniform brightness |
| Example 5 | Strong moist feeling | Uniform brightness |
| Comparative example 1 | A weak moistening feeling | Uneven brightness |
| Comparative example 2 | Moistening and feeble | Uneven brightness |
The wax emulsions prepared in examples 1 to 5 were then used in leather finishing; then, the sheet was left at 80 ℃ for 72 hours, and then the hand and gloss were measured.
| Hand feeling | Gloss of | |
| Example 1 | Strong moistening feeling | Uniform brightness |
| Example 2 | Strong moistening feeling | Uniform brightness |
| Example 3 | Moist feeling and fullness | Uniform brightness |
| Example 4 | Moistening feeling is strong | Uniform brightness |
| Example 5 | Moistening feeling is strong | Uniform brightness |
As can be seen from the table above, after a long time of high temperature, the leather coated with the wax emulsion still has good hand feeling and luster.
The wax emulsions prepared in examples 1 to 5 and comparative examples 1 and 2 were used in leather finishing; then carrying out a water resistance test according to GB/T22891-2008 and a tearing strength test according to GB/T17928-1999;
| water absorption/%) | Permeability g/(cm 2. H) | Tear Strength N/mm | |
| Example 1 | 0.3 | 0.08 | 110.5 |
| Example 2 | 0.3 | 0.07 | 118.3 |
| Example 3 | 0.1 | 0.02 | 155.8 |
| Example 4 | 0.2 | 0.04 | 143.2 |
| Example 5 | 0.2 | 0.05 | 131.6 |
| Comparative example 1 | 1.5 | 0.58 | 46.2 |
| Comparative example 2 | 1.2 | 0.42 | 54.6 |
The wax emulsions prepared in examples 1 to 5 were then used in leather finishing; then placing the mixture in an environment with the temperature of 80 ℃ for 72 hours, and then testing the waterproofness and the tearing strength
| Water absorption/%) | Permeability g/(cm 2. H) | Tear Strength N/mm | |
| Example 1 | 0.5 | 0.15 | 102.5 |
| Example 2 | 0.5 | 0.14 | 115.3 |
| Example 3 | 0.2 | 0.04 | 152.7 |
| Example 4 | 0.3 | 0.08 | 132.6 |
| Example 5 | 0.3 | 0.09 | 124.8 |
| Comparative example 1 | 2.4 | 0.88 | 32.4 |
| Comparative example 2 | 1.8 | 0.76 | 37.9 |
As can be seen from the above table, the leather coated with the wax emulsion of the present invention still has good water resistance and mechanical strength after a long time of high temperature.
Lanolin is a natural substance, and can be recovered from waste water from wool washing. The process for extracting cholesterol by hydrolyzing crude lanolin can produce a large amount of lanolin alcohol and lanolin fatty acid as by-products. Wherein the alkyl carbon chain length of the lanosterol is C14-C36, the lanosterol has a complex structure, and is a mixture of fatty alcohol, cholesterol and lanosterol. Although the lanolin leather finishing wax emulsion cannot be directly used for leather finishing, researches show that the lanolin leather finishing wax emulsion can be used as an excellent raw material, and the lanolin leather finishing wax emulsion is prepared by esterification modification, compounding and emulsification of the lanolin leather finishing wax emulsion, so that the utilization rate of lanolin processing byproducts is improved;
compared with the prior art, the invention adopts the lanonol with specific hydroxyl value, acid value and saponification value as the raw material, and the lanonol is a complex mixture which contains monomer alcohols with various carbon chain lengths; the molecular weight is further increased by researching the esterification reaction of the modified aliphatic carboxylic acid and alkyl acid, and in order to improve the esterification completion degree, two alkyl acids (palmitic acid and isononanoic acid) with carbon chain lengths are preferably selected, and the relative content is optimized; the modified wax emulsion contains various carbon chain structures, further purification and separation are not needed, and the coating effect of the prepared modified wax emulsion is better than that of a single structure; preferably, a modifier is also added in the esterification process, the modifier is a mixture of 2-acetylamino-3- (2,5-difluorophenyl) methyl acrylate, methyl vinyl phosphinic acid and N-decanoyl-N-methylglycine, and the mixture has functional groups such as carboxyl, carbon-carbon double bond, fluorine group and the like, so that the mixture can participate in the esterification reaction to fully ensure the esterification degree, and can be favorable for improving the finishing effect of the modified wax emulsion to ensure that the finished leather has more excellent waterproofness and tearing strength.
The application effect of the lanonol ester is further modified in the first reaction stage, and the lanonol wax is obtained by preferably compounding propyl caproate, palm wax, liquid paraffin, microcrystalline wax, no. 10 white oil and polyether modified silicone oil.
The invention emulsifies the lanonol wax in the second stage, one of the key points of the invention is that in the selection of the emulsifier, a lipophilic emulsifier and a hydrophilic emulsifier are simultaneously selected, and the two different types of emulsifiers form a composite emulsifier system, so that the lanonol wax can be uniformly dispersed in the whole system. The prepared wax emulsion is placed in a room temperature environment for more than 1 year, the phenomena of layering or precipitation and the like are avoided, the stability is good, and the quality guarantee period is long; meanwhile, the wax emulsion is stable and does not delaminate after being centrifuged for 60min at the rotating speed of 3500 r/min;
in addition, an accelerator is added into the wax emulsion, and the accelerator is a mixture of lauryl polymethylsiloxane, dodecafluoro heptanol and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane; under the synergistic effect of the three substances, the finishing effect of the modified wax emulsion can be further improved, so that the finished leather has higher water resistance and tearing strength, and the temperature resistance is improved, so that the finished leather can resist high temperature and still has very high water resistance and tearing strength after being placed for a period of time at high temperature. The wax emulsion prepared by the invention is white emulsion in appearance, has good finishing effect, and can improve the hand feeling of leather and the glossiness and the waterproofness of the leather surface.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A surface finishing wax emulsion for leather is characterized in that: the composition comprises the following substances in parts by weight:
10-20 parts of wool alcohol wax;
2-10 parts of an emulsifier;
1-3 parts of an accelerant;
70-90 parts of deionized water;
the lanolin alcohol wax comprises;
50-80 parts of lanonol ester; 20-30 parts of propyl caproate; 10-15 parts of palm wax; 20-30 parts of liquid paraffin; 5-15 parts of microcrystalline wax; 10-20 parts of No. 10 white oil; 2-5 parts of polyether modified silicone oil.
2. The surface finishing wax emulsion for leather according to claim 1, wherein: the preparation method of the lanonol wax comprises the following steps:
preparing raw materials according to the set weight part, adding the raw materials into a reactor, adjusting the temperature of the reactor to 80-100 ℃ to melt the raw materials, starting stirring to uniformly stir the system, and keeping stirring for 40-80min; then continuously cooling to 50-70 ℃, filtering and discharging to obtain the lanonol wax.
3. The surface finishing wax emulsion for leather according to claim 1, wherein:
the lanonol ester comprises the following substances in parts by weight: 8-12 parts of lanonol; 6-10 parts of alkyl acid; 1-3 parts of a modifier; the alkyl acid is a mixture of palmitic acid and isononanoic acid, and the mass ratio of the palmitic acid to the isononanoic acid is 1-3:1.
4. The surface finishing wax emulsion for leather according to claim 1, wherein: the lanolin alcohol is lanolin alcohol with a high hydroxyl value, wherein the hydroxyl value is 120-160 mgKOH/g, the acid value is less than 5mgKOH/g, and the saponification value is less than 10mgKOH/g.
5. The surface finishing wax emulsion for leather according to claim 1, wherein: the modifier is a mixture of 2-acetylamino-3- (2,5-difluorophenyl) methyl acrylate, methyl vinyl phosphinic acid and N-decanoyl-N-methylglycine, and the mass ratio of the modifier is 3.
6. A surface finishing wax emulsion for leather according to claim 3, 4 or 5, characterized in that: the preparation method of the lanonol ester comprises the following steps:
preparing raw materials according to the set weight part, adding lanolin alcohol, alkyl acid and a modifier into a reactor, adjusting the temperature of the reactor to 70-80 ℃ to enable the reactor to be molten, then adding a catalyst p-toluenesulfonic acid accounting for 0.5-0.8% of the total mass fraction, and uniformly stirring; then heating the system to 130-160 ℃, keeping stirring, and carrying out reduced pressure distillation dehydration reaction for 4-6 h; stopping reduced pressure distillation, and cooling to 60-70 ℃ to obtain lanonol ester.
7. The surface finishing wax emulsion for leather according to claim 6, wherein:
the system pressure is less than or equal to 0.02MPa when the pressure is reduced, distilled and dehydrated; the acid value of the system after the reduced pressure distillation dehydration reaction is less than or equal to 15.0mgKOH/g.
8. The surface finishing wax emulsion for leather according to claim 1, characterized in that: the accelerator is a mixture of lauryl polymethylsiloxane, dodecafluoroheptanol and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane, and the mass ratio of the accelerator to the accelerator is 2.
9. The surface finishing wax emulsion for leather according to claim 1, wherein:
the emulsifier is a mixture of a hydrophilic emulsifier and a lipophilic emulsifier, and the mass ratio of the hydrophilic emulsifier to the lipophilic emulsifier is 4:1-9:1; the hydrophilic emulsifier is polyoxyethylene sorbitan monooleate and/or polyoxyethylene sorbitan monostearate; the lipophilic emulsifier is sorbitan monooleate and/or sorbitan monostearate.
10. The surface finishing wax emulsion for leather according to claim 1, characterized in that: the preparation method of the wax emulsion comprises the following steps: preparing raw materials according to the set weight portion, adding wool alcohol wax, an emulsifier and an accelerant into a reactor, adjusting the temperature of the reactor to 75-90 ℃, and then starting stirring to uniformly stir the system; then adding deionized water at 70-80 ℃, heating the system to 90-95 ℃, controlling the stirring speed to be 200-300 r/min, and keeping stirring for 60min; cooling to 30-45 ℃, filtering and discharging to obtain the wax emulsion.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103012547A (en) * | 2012-12-04 | 2013-04-03 | 杭州下沙生物科技有限公司 | Phosphorylated lanolin alcohol ester and application thereof |
| CN105860856A (en) * | 2016-04-29 | 2016-08-17 | 四川力久知识产权服务有限公司 | Leather polishing wax emulsion and preparation method thereof |
| CN108893204A (en) * | 2018-07-18 | 2018-11-27 | 浙江大学 | Method of the inert gas with modified starch refined wool fat |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103012547A (en) * | 2012-12-04 | 2013-04-03 | 杭州下沙生物科技有限公司 | Phosphorylated lanolin alcohol ester and application thereof |
| CN105860856A (en) * | 2016-04-29 | 2016-08-17 | 四川力久知识产权服务有限公司 | Leather polishing wax emulsion and preparation method thereof |
| CN108893204A (en) * | 2018-07-18 | 2018-11-27 | 浙江大学 | Method of the inert gas with modified starch refined wool fat |
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