65 results about "Leather tanning" patented technology

Hexavalent chromium (Cr (VI)) is widely applied to the industries of electroplating, spinning, leather tanning and chromium product manufacturing, and Cr (VI)-containing sewage has very strong biotoxicity and mutagenicity. Therefore, effective removal of Cr (VI) in industrial wastewater has important significance for protecting ecological environment and human health. As a novel bismuth-based oxychloride photocatalyst, the Bi4NbO8Cl material with the Aurivillius-Sillen structure has the advantages that the unique layered molecular structure of the Bi4NbO8Cl material is beneficial to the separation of photon-generated carriers, and the Bi4NbO8Cl material has good photocatalytic performance. On the basis of a Bi4NbO8Cl visible light response photocatalyst, the concentration of a glucose solution is regulated and controlled, carbon shell layers with different thicknesses are loaded, meanwhile, oxygen vacancy defects with different concentrations are formed, the visible light response Bi4NbO8Cl (at) C composite photocatalyst is obtained, and a good effect is achieved when the visible light response Bi4NbO8Cl (at) C composite photocatalyst is used for treating Cr (VI)-containing wastewater under the acidic condition.

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 present invention discloses a preparation method of a leather tanning agent based on modified convexobar crystals, specifically: γ-glycidyl ether propyl trimethoxysilane, chitosan, triethylamine, and deionized water are sequentially added to a convexobar crystal solution, stirred to obtain a mixed solution; hydrochloric acid is added to the obtained mixed solution to adjust the pH to 4-6, and then freeze-dried to obtain a solid powder, which is a leather tanning agent modified by convexobar crystals. The present invention stably combines the epoxy groups on the convexobar crystals modified with KH-560 through the amino groups in chitosan, and the free epoxy groups exert a tanning effect and cross-link with collagen fibers, thereby greatly improving the shrinkage temperature of the leather. In addition, the present invention proposes a "gradient feeding in-situ one-step preparation strategy" to modify the convexobar crystals, which is environmentally friendly and simple, and realizes the sustainable development of chrome-free tanning 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 discloses a sodium lignin sulfonate-TGIC composite functional chrome-free tanning agent as well as a preparation method and application thereof. The sodium lignin sulfonate-TGIC composite functional chrome-free tanning agent comprises the following components: triglycidyl isocyanurate, an organic solvent, a sodium lignin sulfonate LS solution and ethanol, the preparation method comprises the following steps: S1, dissolving triglycidyl isocyanurate in an organic solvent or water, and heating to obtain a uniform triglycidyl isocyanurate TGIC solution; s2, adding a sodium lignin sulfonate LS solution into the triglycidyl isocyanurate TGIC solution in the step S1, heating and stirring for reaction to obtain a reaction mixed solution; s3, cooling the reaction mixed solution prepared in the step S2 to room temperature, adding ethanol, precipitating a product, filtering, washing, precipitating, and performing vacuum drying to obtain a solid powdery LST chrome-free tanning agent for leather tanning; the combining capacity of the tanning agent and leather collagen fibers is remarkably improved; the prepared LST tanning agent is environmentally friendly, low in cost and capable of replacing a traditional chrome tanning agent.

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 preparation method of hydrothermal carbon based on bamboo processing residues and application of the hydrothermal carbon to adsorption and removal of hexavalent chromium in industrial wastewater. The method comprises the following steps: firstly, crushing the bamboo processing residues, then carrying out mild drying, then carrying out alkaline pretreatment, then mixing the pretreated bamboo powder with a nitrogen-containing dopant under an acidic condition, carrying out a hydrothermal reaction, and then washing, drying and grinding to obtain the bamboo powder-based hydrothermal carbon. The prepared hydrothermal carbon material has a good pore structure and Cr (VI) adsorption performance, and shows good purification capacity for chromium-containing wastewater generated in industries such as leather tanning and electroplating.

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.

1. Name of the design product: Plastic drum (PPH). 2. Use of the design product: For leather tanning, retanning and dyeing. 3. Design key points of the design product: Lies in the shape. 4. Picture or photo that best shows the design key points: Stereogram 1. 5. Other situations that need to be explained: Other explanations: The drum body of the PPH plastic drum is made by spiral winding method, and there is no longitudinal or transverse metal reinforcement structure on the circumference of the drum body.

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 utility model discloses a leather tanning bath lotion filtering device, which belongs to the field of filtering equipment and comprises a shell, a filtering component and a filtrate discharging component. The filter assembly comprises a filter cartridge, a water inlet pipe, a slag discharge pipe, a spiral core and a driving part; the filter cartridge comprises a sleeve and a filter screen cartridge, the sleeve and the filter screen cartridge are communicated with each other, and one end of the sleeve extends out of the shell; the filter screen cylinder is arranged in the shell; the water inlet pipe is communicated with the filter screen cylinder; the slag discharge pipe is communicated with the sleeve; the spiral core is arranged in the filter cartridge; the driving piece is in transmission connection with the spiral core; the filtrate discharging assembly comprises a first water discharging pipe which is arranged in the shell, and the end of the first water discharging pipe extends out of the shell. Liquid to be treated enters the filter cartridge through the water inlet pipe, the spiral core is driven by the driving part to rotate, filtrate flows into the shell through the meshes of the filter cartridge, and impurities in the liquid to be treated are discharged from the slag discharge pipe under the action of the spiral core, so that liquid filtration is realized.

The invention discloses a reversible reaction-based perovskite composite 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, zirconium halide perovskite with high stability is adopted as a raw material, the stability of the perovskite can be synergistically improved by adding halogen metal salt, zirconium ions provide tanning performance for the material, and meanwhile, when the zirconium halide perovskite is compounded with other zirconium tanning agents for tanning, the concentration of the zirconium ions in tanning bath liquid is improved by introducing the zirconium tanning agents; on the basis of the reversible reaction principle, hydrolysis of the zirconium halide perovskite can be slowed down, the nano structure of the zirconium halide perovskite is further maintained, uniform permeation of zirconium is facilitated, the comprehensive tanning performance of the zirconium tanning agent is improved, and particularly the damp and heat resistance stability and filling performance of tanned crust leather are improved.

The invention relates to a method for tanning hide without using chromium as a tanning agent, which uses a nanometric tanning additive and which enables reduced usage, as well as improved quality, of processing water used during the hide tanning process in comparison with tanning using chromium.

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.