31 results about "Leather tanning" patented technology

The invention belongs to the technical field of leather tanning agents, and discloses a light-color polycarboxylic oxidized lignin tanning agent and a preparation method and application thereof. The light-color multi-carboxyl oxidized lignin tanning agent is prepared by carrying out synergistic oxidation reaction on lignin, hydrogen peroxide and ozone in the presence of sodium vinylsulfonate. According to the invention, sodium vinylsulfonate is creatively introduced as an oxidation auxiliary agent, has both surface activity and free radical initiation functions, and forms an efficient synergistic oxidation system with a hydrogen peroxide / ozone system. The system can powerfully break the dense structure of lignin and remarkably promote the benzene ring opening reaction, so that the introduction efficiency of carboxyl is greatly improved. According to the synergistic oxidation system, chromophoric groups of lignin can be effectively destroyed while the lignin is deeply oxidized, deep decolorization and light appearance are achieved, the bottleneck that traditional oxidized lignin is dark in color and difficult to be used for manufacturing light-color or bright-color leather is thoroughly overcome, and the application range of a bio-based tanning agent is greatly expanded.

The invention provides a preparation method of algae-based pure plain leather based on a dual-network gel system. According to the method, natural polysaccharide sodium alginate extracted from seaweed and xanthan gum obtained through microbial fermentation are used as raw materials, and a cross-linking reaction of the raw materials is accurately regulated and controlled to form a double-network structure formed by cross-linked alginate serving as a rigid network and a flexible xanthan gum hydrogen bond network; and the material is reinforced and toughened by utilizing the synergistic complementary characteristics of the two, and the size and deformation stability are kept. Meanwhile, the leather tanning fat liquoring principle is used for reference, and natural grease is introduced, so that the softness and durability of the material are effectively improved. According to the method, natural and renewable polysaccharide resources are adopted, animal components are not contained, and animal ethical problems and use of harmful chemicals are avoided. The method has the advantages of simple process, abundant raw materials, low cost, excellent mechanical properties of pure plain leather products, short production period, large-scale industrial production and wide market prospect, and particularly has the potential of becoming a green and environment-friendly substitute material in the fields of fashion and furniture.

The invention relates to preparation of graphene-loaded nano zero-valent iron and application of the graphene-loaded nano zero-valent iron in chromium-containing wastewater treatment. The preparation method comprises the following steps: preparing 60mL of a KBH4 solution with the concentration of 0.5 mol / L as a solution A and 60mL of a FeSO4. 7H2O solution with the concentration of 0.1 mol / L as a solution B, adding 0.25 g of a single-layer graphene oxide dispersion liquid into the solution B, stirring for 30 minutes, recording as a solution C, slowly dripping the solution A into the solution C, performing suction filtration separation on powder C, and drying to obtain nZVI-coated GO. The graphene is loaded with nZVI to adsorb chromium in chromium-containing wastewater, and nZVI-GO-Cr formed after wastewater treatment can be used as an auxiliary tanning agent for leather tanning or retanning sections and has good recyclability.

The utility model discloses a device for preparing a leather tanning agent by recycling chromium-containing wastewater, which comprises an equipment base and a recycling sedimentation tank, the recycling sedimentation tank is mounted on the equipment base, and a uniform reactant moving and throwing structure is mounted on the recycling sedimentation tank; the utility model relates to the technical field of waste water recovery equipment, and has the beneficial effects that the problems that in the existing waste water treatment, reactants are directly and manually fed into chromium-containing waste water for reaction and precipitation, but fixed feeding is mostly adopted, so that the reactants are not fully mixed with the waste water, the precipitation efficiency of chromium ions and the quality of tanning agents are influenced, and the production cost is high are solved; and the problems that the operation complexity and the energy consumption are increased due to the fact that the sediment directly sinks at the bottom of the reaction tank, cleaning and maintenance are inconvenient, and an integrated movable throwing and sediment discharging system is lacked are solved.

The invention discloses a bisphenol-substance-free phenolic synthetic tanning agent as well as a preparation method and application thereof, and relates to the technical field of tanning. According to the phenolic synthetic tanning agent, at least one of the R group and the X group is selected from an amide structure containing a sulfonic acid group, so that the hydrophilicity and the tanning effect of the synthetic tanning agent are better, substances such as bisphenol S and bisphenol F which have risks to the environment and health are not contained, and the tanning agent is green, environmentally friendly, safe, healthy and suitable for industrial production. And the tanned leather product has better softness, fullness and light resistance, and has better application value.

This invention belongs to the field of water treatment agent technology, and discloses a sepiolite composite material, its preparation method, and its application in leather tanning wastewater. The sepiolite composite material includes: a sepiolite carrier; a quaternary ammonium salt molecular layer gradient-anchored on the surface of the sepiolite carrier, wherein the quaternary ammonium salt molecular layer includes dodecyltrimethylammonium chloride and hexadecyltrimethylammonium chloride; and β-cyclodextrin molecules bound to the surface of the quaternary ammonium salt molecular layer through intermolecular forces. This invention successfully constructs a dual-functional interface on the sepiolite surface, possessing both a "broad-spectrum hydrophobic adsorption domain" (quaternary ammonium salt layer) and a "specific molecular recognition domain" (cyclodextrin layer). This design overcomes the limitations of single modified materials, achieving a synergistic effect of graded capture and synergistic locking of oily contaminants, significantly improving the overall adsorption performance and selectivity of the composite material in complex systems.

1. Name of the product in this design: Crocs (Cloud-feel Leather Tanning). 2. Purpose of this design: For use in Crocs. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The utility model discloses a low -cost environmental protection type quaternary ammonium polymer emulsion leather tanning device, including tanning mechanism, the outside of tanning mechanism is provided with temperature control mechanism, and the bottom of temperature control mechanism is provided with processing mechanism, and the top of processing mechanism is installed with the bottom of tanning mechanism, tanning mechanism includes bottom plate, and the top fixed connection of bottom plate has support plate, support plate is provided with two, and two support plate between swing joint has tanning machine, the right side of tanning machine is provided with charging tank, the back surface fixed connection of feeding pipe has flow controller, the left side fixed connection of flow controller has the feed pipe, and the output of feed pipe is installed with tanning machine. The utility model discloses through quaternary ammonium polymer emulsion to provide liquid for tanning machine inside, adopts quaternary ammonium polymer emulsion as tanning agent, and adopts the automatic liquid discharge of processing mechanism's liquid discharge board, realizes the automatic discharge and processing of tanning liquid and waste water, and further reduces production cost and environmental pollution.

The present application relates to tanning agent, provide a kind of gallic acid-based no bisphenol tanning agent, preparation method and application, including the following steps: polyglycerol, p-sulfobenzoic acid, gallic acid, solvent, concentrated sulfuric acid are mixed and reacted;The solution obtained after reaction is dried to obtain finished product.The present application of a kind of leather tanning agent, preparation method and application, it can overcome the color of vegetable tanned leather, and avoid phenol-formaldehyde resin polymer tanning agent produces bisphenol A and other bisphenol substances.

This invention discloses a method for treating chromium-containing wastewater and its application in the preparation of electromagnetic shielding leather. The method utilizes a Fenton-like reaction with nano-zero-valent iron as a catalyst to destroy the difficult-to-remove chromium complex structure in the chromium-containing wastewater. Simultaneously, magnesium ions are added to prepare a magnesium-chromium-iron ternary hydrotalcite nanomaterial with tanning properties. This material is used as a tanning agent in the leather tanning process, imparting electromagnetic shielding properties to the finished leather. Furthermore, the electromagnetic shielding leather prepared by this invention meets the performance requirements of leather, exhibiting good physical and mechanical properties, good resistance to hot air aging and ultraviolet light aging, and high folding resistance. As a wearable electromagnetic shielding leather, it provides 18 dB electromagnetic shielding performance in the 8–12 GHz electromagnetic wave range while retaining the softness of leather. This invention provides a pathway for the treatment of chromium-containing wastewater and the preparation of electromagnetic shielding leather.

The invention belongs to the technical field of leather tanning, and relates to a cationic hyperbranched antibacterial chrome-free tanning agent and a preparation method and application thereof.The method comprises the steps that amino of 6-hydroxy-2, 4, 5-triaminopyrimidine sulfate and epoxy of triglycidyl isocyanurate are subjected to a chemical cross-linking reaction under the catalysis of triethylamine, and the cationic hyperbranched antibacterial chrome-free tanning agent is obtained; and purifying to obtain the hyperbranched antibacterial chrome-free tanning agent. The antibacterial property, the thickening property, the shrinkage temperature, the mechanical strength, the washing resistance and other properties of the chrome-free tanning agent are improved, and the chrome-free tanning agent has a good application prospect in the field of clean sustainable tanning.

The utility model relates to the field of leather processing, and discloses a leather tanning chromium liquid collecting and recycling device which comprises a supporting frame, a collecting box and a separating box, a power assembly is arranged at the top of the supporting frame, a rotating block is fixedly connected to the top of the supporting frame, one end of the rotating block is rotationally connected with a rotating shaft, and the other end of the rotating shaft is fixedly connected with the separating box. One end of the rotating shaft is rotatably connected with a push-pull rod, one end of the push-pull rod is rotatably connected with a connecting rod, the outer wall of the connecting rod is fixedly connected with a filter plate, the filter plate is arranged at the top of the rotating block, a stabilizing assembly is arranged at the top of the supporting frame, an extrusion assembly is arranged at the top of the supporting frame, and the extrusion assembly comprises a U-shaped plate. The U-shaped plate is fixedly connected to the top of the supporting frame, and a plurality of springs are arranged on the inner wall of the U-shaped plate. According to the device, the separation speed of the chromium liquid and impurities can be effectively increased, and the effect of sorting and recycling the chromium liquid used after leather tanning is achieved under the condition of no human interference.

The application provides an organic silicon s-triazine derivative and a preparation method and application thereof, and belongs to the technical field of leather tanning agent development. The organic silicon s-triazine derivative is prepared from a s-triazine compound and organic silicon, and overcomes the problem of insufficient performance of the leather tanning agent in the prior art. The organic silicon s-triazine derivative can be crosslinked with skin collagen at multiple active sites, and good tanning effect is achieved. In the tanning process using the organic silicon s-triazine derivative, no harmful substances such as formaldehyde and heavy metal salts are involved, and environmental pollution is avoided. The product has strong tanning permeability, the tanned leather has a smooth and fine grain surface and excellent fullness, and is easy to be subjected to subsequent processing steps such as dyeing; and an environmentally-friendly and clean tanning method is provided for the leather-making industry.

This utility model relates to the field of microfiber leather processing technology and discloses a microfiber leather rubbing machine, including a base, a rubbing assembly, and a cleaning assembly. A take-up roller and an unwind roller are rotatably connected to both sides of the base via brackets. The rubbing assembly includes a roller rotatably connected to the top of the base via a fixed seat. A fixed frame is equidistantly and circumferentially fixed to the outside of the roller. A movable plate is slidably connected inside the fixed frame, with its end extending outside the fixed frame. A striking head is fixedly connected to the end of the movable plate. Annular guide rails are fixedly connected to both sides of the top of the base via fixed frames. Ball bearings are movably connected to the end of the connecting frames, and the ball bearings contact the inner surface of the annular guide rails. This utility model effectively avoids the problem of frequent adjustments to the position of the microfiber leather in existing devices, which is not only cumbersome but also reduces the processing efficiency of microfiber leather.

The utility model discloses a leather tightening drying machine which comprises a lower machine plate, guide plates are fixedly installed on the two sides of the upper surface of the lower machine plate, a threaded lead screw is rotatably installed in one guide plate through a bearing, a polished rod is fixedly installed in the other guide plate, the threaded lead screw is a positive and negative type screw rod, and the polished rod is connected with the threaded lead screw. First-stage stand columns are arranged on positive and negative threads of the threaded lead screw in a sleeving mode, the bottom ends of the two first-stage stand columns are in threaded connection with the threaded lead screw, two second-stage stand columns symmetrical to the first-stage stand columns are installed on the polished rod in a sliding mode, and rotating rollers are rotationally installed between the two opposite first-stage stand columns and the second-stage stand columns through bearings. According to the leather drying and tightening device, leather can be tightened when being dried, and the phenomenon that the leather retracts due to water loss during drying is avoided, so that wrinkles on the outer surface of the leather can be effectively avoided, and the surface ductility of the leather during drying processing is improved.

The invention relates to the technical field of fine chemical engineering, and discloses a preparation process for producing potassium formate, which is characterized in that formic acid and potassium hydroxide are used as core reaction raw materials, and a potassium formate finished product is prepared through the steps of precise neutralization reaction, compound impurity removal, activated carbon deep decoloration, vacuum concentration, gradient cooling crystallization and vacuum drying. According to the method, the reaction pH value, the reaction temperature and the material ratio are regulated and controlled, the chelating impurity removal and low-temperature crystallization processes are combined, metal ions and organic impurities in the product are effectively removed, the problems that a traditional potassium formate preparation process is low in purity, poor in yield, low in production safety and insufficient in environmental protection property are solved, and the prepared potassium formate product is high in purity, excellent in water solubility and suitable for industrial production. The method can be widely applied to the fields of oilfield drilling, snow-melting agents, leather tanning, chemical intermediates and the like, and is suitable for large-scale industrial production.

A horizontal automatic door for leather tanning with a rotary drum includes a door frame, a drum door, rollers, an eccentric shaft, and a sealing strip. The rollers are mounted on the drum door and cooperate with guide rails on the door frame. The sealing strip is located below the drum door. The eccentric shaft is mounted on the drum door. The door also includes a drive assembly, a transmission assembly, an elastic element, and a limiting element. The drive assembly is mounted on the door frame. The transmission assembly is connected to both the drive assembly and the eccentric shaft. The elastic element is sleeved on the eccentric shaft and cooperates with both the transmission assembly and the drum door. The limiting element is mounted on the door frame to limit the movement of the drum door.

The invention discloses a bimetallic MOFs derived porous layered double hydroxide nano tanning agent as well as a preparation method and application thereof, and belongs to the technical field of leather tanning agents. According to the method disclosed by the invention, through a double-metal synergistic mechanism, the second metal provides structural support for the formation of the layered double hydroxide laminate, and a coordination crosslinking site is newly added; meanwhile, the porous framework of the MOFs ensures full exposure and transmission of active sites. The formed MOFs derived porous layered double hydroxide heterostructure has porous permeability and a layered high-activity surface, and the problem that the tanning performance is not ideal due to the fact that surface active sites of a traditional monometal MOFs tanning agent are limited and the multi-point cross-linking capacity of the traditional monometal MOFs tanning agent and collagenous fibers is insufficient is remarkably solved.

The invention discloses an environment-friendly tanning process for high-strength cow split leather, and relates to the technical field of leather tanning. Comprising the following steps: pretreating fibers, namely soaking cow split leather embryo in water by using a compound enzyme preparation, opening a collagenous fiber channel and removing interfibrous substances and impurities; after washing with clear water, softening collagenous fibers by using a composite softening enzyme; and main tanning: putting the cow split leather blank subjected to fiber pretreatment into a rotary drum, adding water and a silk fibroin solution, and operating the rotary drum under neutral to weakly alkaline conditions, so that silk fibroin fully permeates and forms a uniform protein coating on collagenous fibers. By introducing a silk fibroin, laccase and modified vegetable tannin ternary synergistic tanning system, a covalent cross-linked collagen-fibroin-tannin three-dimensional cross-linked network is constructed in situ in the leather, and the tensile strength, tearing force and humidity and heat resistance of the finished leather are improved.

This utility model discloses a rotary soaking device for leather tanning, including a soaking tank. An extension plate is fixedly connected to one side surface of the soaking tank. A stepper motor is fixedly installed on the top surface of the extension plate. A first pulley is connected through the output end of the stepper motor. A belt is attached to the surface of the first pulley. A second pulley is attached to the side surface of the belt away from the first pulley. A rotating rod is connected through the middle of the interior of the first pulley. A rotating rod is fixedly connected to the side surface of the stepper motor output end that passes through the soaking tank. By setting a connecting component, it is easier and simpler to replace the rotating roller compared to the bolt. It is also easier to replace the connecting component when it is damaged. At the same time, by setting a clamping component, the leather can be clamped, which facilitates the subsequent rotary soaking of the leather.

The utility model provides a leather tightening device for leather processing, and relates to the technical field of leather tightening devices, the leather tightening device comprises a leather tightening table, through the arrangement of an adjusting leather tightening device, after leather is flatly laid on the leather tightening table, the leather tightening table can be adjusted according to the size of the leather, and the leather tightening table can be adjusted according to the size of the leather. The corresponding number of the L-shaped frames and the first threaded rods are inserted into the L-shaped grooves, then the L-shaped frames and the first threaded rods slide to certain positions in the inner walls of the L-shaped grooves according to the positions where leather is placed and needs to be tightened, then the L-shaped frames and the first threaded rods are fixed, and then the multiple fixing clamps are clamped to the edges of the leather. When the leather is dried, a plurality of edges of the leather can be toggled and pulled at the same time only through pulling of the second threaded rod, it is guaranteed that pulling force at the positions is uniform, meanwhile, the first spring can be stretched open according to the tenacity of the leather under pulling, the flatness of the dried leather can be improved through the operation, and the drying efficiency is improved. And meanwhile, the pulling strength of workers and the toggling processing efficiency are reduced.

This utility model discloses a tanning device for preventing leather entanglement, relating to the field of leather production. It addresses the problems of existing tanning devices that use clamping grooves to fix the edges of leather to prevent entanglement, but this method is inefficient due to individual clamping. Furthermore, after tanning, the drum needs to be lifted and removed by a lifting device before the leather can be taken out, affecting tanning efficiency. The tanning drum has partition plates fixedly connected to both sides of its inner center. Multiple anti-entanglement columns are arrayed on the inner wall of the drum. A material loading / unloading opening is located at the center of the front face of the drum, and an arc-shaped sealing plate is rotatably connected to the outside of the opening. A receiving pool is fixedly connected to the upper surface of the support platform between two support frames. By setting the partition plates, the internal space of the tanning drum is divided into multiple independent chambers, effectively reducing the amount of leather accumulation. Combined with the physical barrier effect of the anti-entanglement columns, the probability of leather entanglement during the tanning process is significantly reduced.

This invention discloses a preparation process for green vegetable-tanned shoe upper leather based on a transfer film method, belonging to the field of environmentally friendly leather tanning technology. Using chromium-free vegetable-tanned raw leather as the substrate, this invention achieves the preparation of green, high-performance shoe upper leather through interface activation modification, combined with water-based plant extract transfer film coating and release paper hot-press transfer film technology. The process includes: preparation of chromium-free vegetable-tanned raw leather, interface activation treatment, preparation of water-based plant extract transfer film coating solution, semi-curing of release paper into a film, hot-pressing lamination, curing and peeling, and final finishing. This invention is entirely free of chromium, formaldehyde, and heavy metals. It uses water-based plant-based resin and natural tannin crosslinking, resulting in high bonding strength between the transfer film layer and the leather substrate, excellent folding and abrasion resistance, and breathability and comfort. It solves the problems of high VOC content, numerous surface defects, and easy coating peeling in traditional transfer film leather. The resulting shoe upper leather meets the OEKO-TEX standard for environmental performance and is suitable for high-end footwear industrial production.

The leather tanning device comprises a main box body, the upper portion of the main box body is provided with a feeding port and an agent adding port, and the lower portion of the main box body is provided with a liquid discharging port and a discharging door; the multi-dimensional stirring mechanism is arranged in the main body box body; the variable-volume extrusion tanning system is linked with the multi-dimensional stirring mechanism; the vacuum system is connected with the main box body; the automatic control system is arranged on the main box body; wherein the multi-dimensional stirring mechanism comprises a central rotating shaft driven by a first driving motor, a planetary gear set consisting of a sun gear, a planetary gear and an inner gear ring, and an eccentric swinging assembly consisting of a first cam and a connecting rod mechanism. Through cooperation of multi-dimensional linkage stirring, intelligent extrusion rubbing and vacuum pulsation, leather tanning efficiency, uniformity, environmental protection and finished product quality are comprehensively improved, and the problem of leather winding is fundamentally solved.

The invention discloses an epoxy-terminated polylysine-based chrome-free tanning agent as well as a preparation method and application thereof, and belongs to the technical field of green biomass materials and ecological leather. The preparation method comprises the following steps: adding a polylysine solution into a glycerol triglycidyl ether solution, then adding a catalyst, and carrying out stirring reaction, dialysis, freeze drying and grinding to obtain the epoxy-terminated polylysine-based chrome-free tanning agent. An active epoxy group in a glycerol triglycidyl ether structure is grafted to a polylysine polymer through a covalent cross-linking reaction of amino and an epoxy group, terminal epoxidation modification of polylysine is realized by utilizing the characteristics of rich amino groups, high compatibility, high isotactic points, reproducibility and the like on polylysine, and in the leather tanning process, the terminal epoxidation modification of polylysine is realized. The tanning agent can generate strong crosslinking with leather collagen fibers, endows tanning with an isoelectric point, has strong binding capacity to anionic materials, and realizes high absorption of leather post-treatment materials and ecological leather manufacturing. Pollution in the wet dyeing and finishing process is avoided through the high electric point, and a thought is provided for design of a novel environment-friendly chrome-free tanning agent.

This invention provides a triazine derivative having the structure shown in formula (1). This invention also provides a method for preparing the triazine derivative and its uses. The triazine derivative provided by this invention has a novel structure and is very suitable as a new type of leather tanning agent, achieving excellent tanning effects. Moreover, it eliminates the need for chromium powder, making it green and environmentally friendly, which is conducive to the transformation of the leather industry towards cleaner production. The triazine derivative provided by this invention uses inexpensive and readily available aniline derivatives, sulfonyl lactones, and trihalomycins as raw materials. The preparation process is simple, the reaction conditions are mild, the purification process is easy, and the yield of the target product is high. Therefore, it has strong industrial applicability and is suitable for large-scale production and application.

The invention relates to the technical field of leather processing, in particular to a leather tanning liquid circulating device with a waste residue filtering function, the main body of the device is a filtering treatment system box, and a circulating source device is arranged in the filtering treatment system box to drive tanning liquid to circulate. The filter case is responsible for waste residue filtration, and the detection system monitors parameters of tanning liquid in different treatment stages and comprises a stock solution comprehensive monitor, a pretreatment liquid monitor and a clear liquid standard-reaching monitor. The liquid circulation pipeline system is connected with all the assemblies to form a circulation loop and specifically comprises a solution concentration assembly, a filtering input pipe, a turnover pipe, a backflow turnover pipe, a backflow pipe and the like. The input turnover pipe is connected to the top distribution box, then enters the filter case through the ingress pipe, and returns to the clear liquid standard-reaching monitor through the eduction pipe, the reflux pump and the first reflux pipe after filtration, and the second reflux pipe is connected to the solution shunting assembly of the circulation source device. According to the invention, an integrated circulating system of multi-stage dynamic collaborative filtering and intelligent supplement monitoring is constructed, and the quality of the tanning liquid is ensured.

The invention discloses a polylysine-based chrome-free tanning agent with an aromatic slow-release behavior and a preparation method and application thereof, and belongs to the technical field of green biomass materials and ecological leather, the method comprises the following steps: carrying out epoxy modification on polylysine to obtain an epoxy modified polylysine cross-linking agent, then adding aromatic aldehyde to carry out a cross-linking reaction, and carrying out vacuum drying to obtain the polylysine-based chrome-free tanning agent with the aromatic slow-release behavior. And carrying out heating and stirring reaction, dialysis, freeze drying and grinding to obtain the polylysine-based chrome-free tanning agent with the aromatic slow-release behavior. The method is applied to a leather tanning process, and biomass green ecological leather with fragrance slow release is obtained. Powerful crosslinking is formed with leather collagen fibers, so that the physical properties of the leather are remarkably improved; meanwhile, the leather is endowed with pleasant unique fragrance, and unpleasant amine odor generated in traditional leather making is effectively neutralized and eliminated. And double breakthrough of ecological leather manufacturing in performance improvement and sensory experience improvement is realized. The preparation route is simple, and a thought is provided for design of a novel green chrome-free tanning agent and manufacturing of aromatic leather.

The invention discloses a high-activity dealumination zeolite-based nano tanning agent as well as a preparation method and application thereof, and belongs to the technical field of leather tanning agents. The preparation method comprises the following steps: dissolving A-type artificial zeolite in an acidic solution with the pH value of 1.0-2.5, and then carrying out dealumination treatment; after the dealumination treatment is finished, alkali is added to adjust the pH value to 3.5-4.0, and a dealuminated nano zeolite suspension is obtained; mixing the dealuminated nano zeolite turbid liquid with organic hydroxyl carboxylate to obtain a modified nano zeolite solution; and the modified nano zeolite solution is subjected to spray drying, and the high-activity dealumination zeolite-based nano tanning agent is obtained. The method is easy to operate, process parameters are easy to control, raw materials are easy to obtain, the cost is moderate, and the prepared dealuminated zeolite-based nano tanning agent has good stability and biocompatibility, can effectively adsorb protein and improve the stability of the protein, has high antibacterial performance and can meet the use requirements of leather products.

The invention relates to a preparation method and application of a multifunctional zeolite chrome-free tanning agent, and belongs to the technical field of leather tanning. A silane coupling agent (KH560) is introduced into zeolite to finish surface functional modification of a zeolite material, then active amino groups on the surface of a modified zeolite molecule and carboxyl groups of malic acid are respectively subjected to covalent bonding reaction with epoxy groups of glycerol triglycidyl ether (GTE), a multifunctional zeolite chrome-free tanning agent crude product is synthesized, and the multifunctional zeolite chrome-free tanning agent is prepared. And then carrying out solid-liquid separation, purification and drying treatment to finally obtain the solid powdery multifunctional zeolite chrome-free tanning agent. According to the multifunctional zeolite chrome-free tanning agent, the interface bonding strength of tanning agent molecules and leather collagen fibers is remarkably enhanced, and leather can be synchronously endowed with excellent damp-heat-resistant stability (shrinkage temperature), mechanical strength, high wet finishing material absorption, washing durability and the like in the tanning process.