51 results about "Leather tanning" patented technology

The invention relates to leather tanning agents, and to a zeolite composition suitable as a single tanning agent, said zeolite composition comprising a zeolite, a first weak acid, a second weak acid and optionally a third weak acid. This zeolite composition enables effective and efficient chrome-free tanning.

The invention discloses a system for preparing a leather tanning agent by using chromium-containing wastewater, the system comprises a drainage pipe and a circulating pipe, the drainage pipe and the circulating pipe are both connected with a tanning drum, a recycling unit is arranged between the drainage pipe and the circulating pipe, and the recycling unit is used for recycling water used by the tanning drum; the invention relates to the technical field of leather tanning agent recycling, in-situ regeneration and closed-loop recycling of chromium-containing wastewater are achieved through an integrated system, the traditional chromium recycling process is shortened, the recycling rate is increased to 95% or above, the physicochemical performance of a regenerated tanning agent completely reaches the standard, the regenerated tanning agent can be directly supplied to a tanning drum, the core problems that a circulation link is too long, and recycling is not thorough are thoroughly solved, and the recovery efficiency is improved. And after being recycled, the chromium is directly used for tanning production by directly reproportioning the chromium, so that the hazardous waste discharge and the production cost are synchronously reduced, and the waste of the chromium material is avoided.

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.

The invention discloses a leather synchronous tanning, printing and dyeing method based on environment-friendly bio-based dye, relates to the technical field of leather processing, is particularly suitable for production of clothing leather, and comprises the steps of leather blank pretreatment, preparation of environment-friendly bio-based dye tanning treatment liquid, synchronous tanning, printing and dyeing and post-treatment. According to the method, two independent procedures of traditional tanning and dyeing are combined into a whole, so that the production period is greatly shortened, equipment occupation, water consumption, energy consumption and labor cost are reduced, and the production efficiency is improved; in the whole process chain, the use of a chrome tanning agent is avoided, the pollution risk of toxic and harmful substances such as heavy metal chromium is eliminated from the source, and the load of wastewater treatment and the impact on the environment are greatly reduced. The method is not only suitable for common cowhide, sheepskin and the like, but also suitable for high-grade clothing leather, soft leather and other leather types with high hand feeling requirements due to mild treatment conditions and effective protection on collagenous fibers.

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.

A sewage collection system for a workshop cow leather and automobile leather tanning process comprises a tannin extract waste water collection system (1), a comprehensive waste water collection system (2), a glutaraldehyde waste water collection system (3), a sulfur-containing waste water collection system (4) and a high-salinity waste water collection system (5), and the comprehensive waste water collection system (2) adopts a drainage ditch (6) to collect waste water. The drainage ditch (6), the thick-section drainage ditch (102), the thin-section drainage ditch (103), the glutaraldehyde waste water drainage ditch (301) and the high-salt drainage ditch (501) are all made of reinforced concrete with the anti-permeability pressure larger than or equal to 0.6 MPa in a cast-in-place mode, and the ditch bottoms are leveled along the slope through high-strength self-leveling mortar. The tannin extract waste water collecting system, the comprehensive waste water collecting system, the glutaraldehyde waste water collecting system, the sulfur-containing waste water collecting system and the high-salt waste water collecting system are combined, so that cross contamination among various kinds of sewage is effectively avoided, the sewage can be independently treated in the subsequent treatment link, and the treatment cost is reduced. And the environment is not polluted when the wastewater is discharged.

The invention discloses a leather tanning method based on gas-phase mass transfer, which comprises the following steps: firstly, unhairing, liming, deliming and softening raw leather, and carrying out gradient dehydration on the softened raw leather, so that the water content of the pretreated raw leather is 9-11%, and the pretreated raw leather is prepared; and then the pretreated raw leather is placed in a closed treatment device, after a tanning agent is gasified, the tanning agent is introduced into the closed treatment device for tanning treatment, and the tanned leather is obtained. By means of the technology, the shrinkage temperature of the tanned crust leather is increased to 80-90 DEG C, it is indicated that the performance of the leather tanned through the method is remarkably improved, and it is verified that the tanning quality can be effectively improved through the method.

The invention discloses a method for tanning leather, an anionic active agent composition, the use of a cationic active agent for the pre-tanning of leather and tanned leather. The method comprises a pre-tanning step and a tanning step, characterized in that, in the pre-tanning step, the leather is treated with a cationic active agent comprising a quaternized ester of a fatty acid and of a triethanolamine, or a mixture thereof, and subsequently the leather is treated with an anionic active agent comprising a tannin plant extract and a natural or synthetic dispersing agent selected from the group consisting of lignosulfonates, stillage, sulfonated disulfonic acid-based polymers, sulfonated naphthalene polymers or mixtures thereof, to obtain a leather having a shrinkage temperature (ST) of at least 65°C, and wherein the pre-tanning step and the tanning step do not comprise a treatment with aldehydes or aldehyde donor compounds and / or a treatment with metal salts.

The present application discloses a mycelium leather tanning directional movement dehydration process, specifically comprising the following steps: step one, feeding; step two, preliminary dehydration; step three, preliminary arrangement; step four, secondary dehydration; step five, secondary arrangement; step six, final dehydration and discharging; step seven, cleaning; the present application relates to the field of leather tanning dehydration technology. The mycelium leather tanning directional movement dehydration process provides convenience for the automatic transportation of the tanned mycelium leather through the setting of the first conveying assembly, the synchronous turning assembly and the second conveying assembly. The layered dehydration of the mycelium leather is realized under the cooperation of the primary dehydration assembly, the secondary dehydration assembly and the tertiary dehydration assembly, the purpose of directional movement dehydration of the mycelium leather is achieved, and the mycelium leather is leveled during the interval between the adjacent two dehydrations, thereby ensuring the quality of the dehydrated mycelium leather.

The present invention discloses an oxidized starch / zirconium halide perovskite nanocomposite tanning agent, its preparation method, and application, belonging to the technical field of leather tanning agents. The preparation method disclosed in the present invention uses oxidized starch / zirconium halide perovskite, which is a nanocrystal composed of zirconium metal ions, cesium metal ions, chloride ions, or bromide ions, with oxidized starch, oleic acid, and oleylamine as ligands. The zirconium ions and oxidized starch can play a tanning role, and the ligands can also act as self-masking agents to inhibit the hydrolysis of zirconium, slowing down the phenomenon of surface over-tanning. This improves the thickening rate of tanned crust leather while achieving zirconium tanning, and imparts a comfortable feel to the crust leather.

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 relates to the technical field of animal leather tanning processing, and discloses animal leather tanning processing equipment which is characterized in that the side, away from a first supporting rod, of a second supporting rod is fixedly connected to a limiting ring, a supporting block is fixedly connected to a bottom plate, and the side, away from the bottom plate, of the supporting block is fixedly connected with a driving motor; the output end of the driving motor is fixedly connected with a transmission shaft, the side, away from the driving motor, of the transmission shaft is fixedly connected with a small gear, the small gear is connected with a large gear in an engaged mode, and the large gear is fixedly connected to the tanning cabin. According to the animal leather tanning processing equipment, the first air cylinder is arranged, the limiting ring drives the tanning cabin and animal leather in the tanning cabin to move upwards, the limiting ring drives the second supporting rod to move upwards along the first supporting rod, the height of the animal leather tanning processing equipment can be adjusted more conveniently, and the flexibility of the animal leather tanning processing equipment can be effectively improved; and the animal leather tanning processing equipment is more convenient to adjust.

The application discloses a tanning method for growing nano-tanning agents in situ between collagen fibers, and belongs to the technical field of leather tanning. The application uses metal salts with tanning properties and anionic small molecule ligands as raw materials, uses the masking effect of the anionic small molecule ligands on the metal salts with tanning properties, promotes the uniform in-situ growth of LDHs in the collagen fibers, and thus improves the moisture and heat stability, chemical medicine resistance, microbial action resistance and physical and mechanical properties of the crude leather. The metal salts and the organic ligands used are widely sourced and have low cost.

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 invention belongs to the field of tanning agents for leather making, and particularly discloses a method for preparing a composite tanning agent by catalytically oxidizing starch through a metal-based eutectic solvent. The preparation method comprises the following steps: blending metal inorganic salt and an organic solvent, heating and stirring to obtain a metal-based eutectic solvent, adding starch into the metal-based eutectic solvent, stirring, and finally adding hydrogen peroxide to oxidize the starch, thereby obtaining the metal-based modified starch composite tanning agent. The prepared composite tanning agent has excellent tanning performance, and tanned crust leather is high in shrinkage temperature and high in physical and mechanical performance. The preparation method is simple, fast, green, free of pollution, easy to industrially popularize and good in application prospect.

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 present invention discloses a method for preparing a biomass leather tanning agent based on corncob extract, which comprises the following steps: washing corncobs with distilled water, drying, crushing, and sieving; mixing corncob powder with a NaOH solution, heating and reacting; cooling to room temperature; adjusting the pH of the reaction solution to 6-7; precipitating with alcohol; filtering to obtain a filtrate; decompressing and distilling the filtrate to obtain a concentrated solution; adjusting the pH of the concentrated solution to 2-4; freeze-drying to obtain a polysaccharide; dissolving the polysaccharide in anhydrous ethanol; adding boron trifluoride etherate; mixing uniformly; dropping glycidyl ether; heating and reacting; and dialyzing with ultrapure water. The biomass tanning agent prepared by the present invention is soluble in water, has a simple preparation process, and has a wide molecular weight distribution. It can cross-link with leather fibers at different levels, effectively improving the shrinkage temperature, filling properties, and softness of leather, and overcoming the defects of brittle and hard leather after tanning with small molecule epoxy tanning agents.

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.