265results about "Tanning treatment" patented technology

The invention discloses a polyether modified silicone oil hydrophobic retanning fatliquor as well as a preparation method and application thereof, and belongs to the technical field of leather chemical industry. The preparation method comprises the following steps: preparing polyether modified silicone oil from end hydrogen-containing silicone oil and allyl polyether as raw materials, uniformly dispersing the polyether modified silicone oil, an emulsifier and water to obtain a water-in-oil emulsion, adding water into the water-in-oil emulsion, uniformly dispersing to obtain an oil-in-water mixture, adding deracetam BTL, and uniformly dispersing to obtain the deracetam emulsion. The tensile strength, the tearing strength and the hydrophobic effect of leather treated by the polyether modified silicone oil hydrophobic retanning fatliquor are remarkably improved, the complete infiltrating time of the leather can reach 10 min, meanwhile, it can be guaranteed that the leather has good softness, and the additional value of the leather can be increased.

The invention provides high-strength waterproof flame-retardant clothing leather and a preparation method thereof.The method comprises the steps that a sheepskin raw material is obtained, degreasing treatment is conducted on the sheepskin raw material through a degreasing agent, liming treatment is conducted on the sheepskin raw material subjected to degreasing treatment through liming liquid, and a first leather semi-finished product is obtained; performing basic tanning treatment on the first leather semi-finished product by adopting a target chrome-free tanning agent to obtain a second leather semi-finished product; carrying out retanning treatment on the second leather semi-finished product by adopting a target retanning agent to obtain a third leather semi-finished product; performing post-treatment on the third leather semi-finished product to obtain a fourth leather semi-finished product; the fourth leather semi-finished product is subjected to coating spraying treatment, a waterproof layer, a flame-retardant layer and a modification layer are formed on the surface of the fourth leather semi-finished product, a fifth leather semi-finished product is obtained, and the fifth leather semi-finished product is subjected to soft finishing, so that the high-strength waterproof flame-retardant clothing leather finished product is obtained. The waterproof and flame-retardant effects are good, and the cost is low.

The present invention discloses a soaking device for leather modification based on chemical process in the field of leather processing technology, comprising a tanning barrel for soaking leather, a lifting assembly for conveying the leather into the tanning barrel being arranged above the tanning barrel, and a plurality of fixing assemblies distributed in a circular shape and at equal intervals being arranged at the bottom of the lifting assembly. The present invention adopts the fixing assembly, clamps the leather at both ends, and stretches the leather from the middle section so that the leather is fixed and stretched and laid. In a vertical manner, the height of the support block gradually rises, so that the animal skin is gradually stretched and extended; in the horizontal direction, the support blocks on both sides are stretched by the rod body to slide toward the two ends of the support rod, so that the animal skin is also gradually stretched and extended in the horizontal direction, so that the leather can fully contact with the tanning agent during the tanning process, thereby improving the tanning treatment effect on the leather.

An apparatus includes a process chamber, a controllable compressor for pressurizing a fluid, a pressure reducing member, an inlet for a processing agent and a controller. The process chamber is a pressure chamber. The controllable compressor pressurizes a fluid and introduces the pressurized fluid into the process chamber from a source. Further the controllable compressor controls a predefined pressure in the process chamber to reach a supercritical state of the fluid. An inlet for a processing agent facilitates introduction of the processing agent into the process chamber prior to, during, or subsequent to pressurization of the fluid. The pressure reducing member reduces the pressure of the fluid at least to reach a gaseous state subsequent to processing the leather object such that the time for reduction of pressure exceeds a predefined reduction period or the reduction of pressure does not exceed a predefined leather pressure reduction gradient.

An emulsion-type acrylic retanning agent and its preparation method relate to the technical field of leather chemical production. The preparation method involves reacting a fatty alcohol (acid) polyoxyethylene ether (ester) with maleic anhydride to obtain an intermediate, which is then copolymerized with a vinyl monomer in the reaction medium of water using persulfate in the presence of an emulsifier to obtain an emulsion product. The mass ratio of the intermediate to the vinyl monomer is 1.0:1.2-3.6, the reaction temperature is 80-95°C, the reaction time is 3-5 hours, the pH is 3-4, and the initiator dosage is 0.5-2.5% of the total mass of the intermediate and monomer. The finished product is stable and non-delaminated, simple to produce, low in cost, and produces leather that is plump, soft, and well-filled.

Methods and systems for sorting hides are provided. In particular, one or more embodiments comprise a tanning control system that enhances the traceability of hides by capturing and utilizing data related to the unloading, tanning, sorting, and packaging of hides. Furthermore, one or more embodiments enable the tanning control system to improve efficiency by sorting hides based, at least in part, on data generated during prior tanning processes. Additionally, one or more embodiments facilitate the tanning control system in customizing the sorting and packaging of hides based, at least in part, on one or more hide characteristics and / or customer specifications.

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 present invention discloses a preparation method of chrome-free tanned upper leather, comprising the following steps: Step 1: Re-wetting Add the prepared aqueous solution of sodium chloride and sodium bicarbonate into a drum machine, and then put in the raw hide, and rotate for 10 - 30 min; Step 2: Water washing Immerse the re-wetted raw hide in pure water and wash for 10 - 30 min; Step 3: Tanning Add water, a catalyst, and a modified tanning agent into the drum machine, and run the drum machine for tanning for 200 - 360 min; Step 4: Alkali raising Add sodium bicarbonate into the drum machine, adjust the pH to 8.0, raise the temperature to 35 °C, rotate for 4 h, stand for 5 - 20 h, and dry to obtain the upper leather; The modified tanning agent is formed by the reaction of starch, trimethylolethane triglycidyl ether, tetramethylethylenediamine, N-(2-hydroxyethyl)guanidine, and epoxypropionic acid. The purpose of the present invention is to provide a preparation method of chrome-free tanned upper leather.

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 primary processing production line for leather preparation and a preparation technology, and belongs to the field of leather preparation. Comprising guide rails and a fixing shell, dipping equipment, tanning equipment, shaving equipment and dyeing equipment are arranged between the guide rails, the guide rails are sleeved with the fixing shell, a walking assembly is arranged in the fixing shell, a circular plate is movably connected to the top face of the fixing shell, a bottom plate is fixedly connected to the top face of the circular plate, and a steering assembly is arranged on the side wall of the circular plate. The walking assembly and the guide rail are arranged, the first motor drives the movable shaft to rotate, and the movable shaft can achieve simultaneous rotation of the two driving wheels through transmission of the first belt wheel and the first belt; the driving wheel moves on the guide rail, so that automatic transfer operation of leather among the soaking equipment, the tanning equipment, the shaving equipment and the dyeing equipment can be realized, the labor intensity of manual operation is reduced, and the processing efficiency is improved.

The invention relates to the technical field of leather chemical industry and leather manufacturing, in particular to a tannin extract based on metal complex modification and a preparation method and application of the tannin extract based on metal complex modification. 15 to 25 parts of aluminum sulfate; 5-10 parts of lanthanum sulfate / cerium sulfate; 0.5-2 parts of sulfuric acid; 0.5 to 2 parts of citric acid; and 500 to 600 parts of water. The modified tannin extract which is light in color, good in dispersity and excellent in tanning property is prepared through the steps of oxidative degradation, chelating masking, metal synergistic complexing and the like. The method is simple in process, environmentally friendly, efficient and suitable for industrial production, and the problems that a traditional vegetable tanning agent is low in whiteness and poor in light resistance stability when applied to white leather, and traditional metal tanning leather is hard in hand feeling, insufficient in light resistance and the like are effectively solved.

The present application belongs to the field of leather industry production, and particularly relates to a method for high absorption chrome tanning by using cross-linking enzyme preparation. The method comprises the following steps: water immersion, unhairing and liming, deliming, softening, enzyme-assisted tanning, and acid immersion tanning. The enzyme-assisted tanning is assisted by using cross-linking enzyme preparation. The cross-linking enzyme preparation is not used in combination with the hydrolytic enzyme in the softening step. The cross-linking enzyme comprises glutamine transaminase (TG enzyme). The comprehensive activity of the cross-linking enzyme is controlled to be 1-30 U / ml in the application process, and the activity of the TG enzyme is controlled to be 1-20 U / ml. The process in the present application meets the environmental protection requirements. Firstly, the tanning agent absorption rate in the tanning process is successfully improved, and the waste discharge amount in the tanning process is reduced. Secondly, the cleaner cross-linking enzyme preparation is successfully used to replace the chemical auxiliary agent to improve the tanning agent absorption rate. Thirdly, the process operation is simplified.

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.

This invention relates to the technical field of organic chromium-free tanning agents, and discloses a method for preparing a sustainable green amphoteric organic chromium-free tanning agent, comprising the following steps: (1) adding corn starch to water, then adding sodium periodate, stirring and reacting in the dark to obtain DCST product; (2) mixing ethylene glycol diglycidyl ether, acetone and tetramethylenediamine, then adding hexahydro-1,3,5-tris(hydroxyethyl)-s-triazine dropwise, maintaining the reaction for a period of time after the addition is complete; after the reaction is complete, distilling under reduced pressure to obtain HHTT-EGDE product; (3) dispersing the HHTT-EGDE product in water to obtain HHTT-EGDE solution; mixing the HHTT-EGDE solution with the DCST product, heating and reacting to obtain organic chromium-free tanning agent. Leather tanned with the organic chromium-free tanning agent of this invention has higher Ts, better mechanical strength, whiteness and antibacterial properties.

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 present application relates to a method for preparing conductive leather, conductive leather, and its application and finishing methods, and more particularly to a method for preparing conductive leather, conductive leather, and its application and finishing methods that can be applied to electronic products such as flexible or wearable devices. The conductive leather preparation method includes grinding the leather, a primary tanning process in which a conductive material and leather are drum-tanned together, and a secondary tanning process in which the leather obtained above is drum-tanned together with ingredients such as organic raw materials. The conductive leather obtained by this preparation method not only has basic conductivity but also has high wear resistance, thereby ensuring its durability and preventing a decrease in its sensory ability.

The invention discloses a complexing agent for chrome-free tanning of leather. The complexing agent is prepared by reacting the following components in parts by mass: 50 to 100 parts of glycol polyol, 50 to 200 parts of unsaturated conjugated anhydride, 0.1 to 0.5 part of catalyst, 50 to 300 parts of anhydrous sodium sulfite and 150 to 600 parts of water. Aiming at the characteristics of zirconium tanning and titanium tanning, the invention provides the complexing agent for chrome-free tanning of leather, which has the advantages of easily available raw materials, simple production process operation and small environmental pollution.

The invention discloses a chromium-free and formaldehyde-free synergistic tanning method for high-flexibility ecological Tan sheep skin, which comprises the following steps: firstly, pre-tanning the Tan sheep skin by using a 6-10g / L biomass-based aldehyde tanning agent, and then carrying out zirconium tanning and synergistic tanning to obtain chromium-free and formaldehyde-free tanned Tan sheep skin. The bio-based aldehyde tanning agent is prepared through selective oxidation of glycerin, the structure of the bio-based aldehyde tanning agent contains aldehyde groups and hydroxyl groups, polyglyceraldehyde with a long-chain structure can be formed through polymerization by adjusting the pH value, and then the polyglyceraldehyde is covalently cross-linked with collagen amino groups; the introduction of the zirconium tanning agent not only can be complexed with collagen carboxyl, but also can be coordinated with hydroxyl on the structure of the biomass-based aldehyde tanning agent to form a multi-point cross-linked network, so that the flexibility and damp-heat resistance stability of the Tibet lamb skin are remarkably improved, and meanwhile, the health and environmental risks caused by chromium salt and formaldehyde are thoroughly eliminated.

The invention relates to the use of a tannin-containing product which can be produced or is produced by means of (i) an aqueous solution or dispersion, containing one or more polar organic solvents, in the form of an extract, or (ii) a supercritical solvent in the form of a residue of the extraction, or (iii) pure water in the form of a residue of the extraction, or (iv) a mixture of a supercritical and a polar solvent in the form of a residue of the extraction, for tanning and / or retanning hides or skins or intermediate products thereof resulting from leather production; and further related subject matter of the invention.

The invention discloses a treatment method of mycelium leather, and relates to the field of leather, and the treatment method comprises the following steps: 1, carrying out deacetylation treatment on a freshly harvested mycelium material obtained by solid fermentation; 2, washing the mycelia subjected to deacetylation treatment with water, and keeping the pH value at 5.5-7; 3, tanning treatment is conducted on the mycelium material through a cyanuric chloride derivative type tanning agent; 4, retanning is conducted after washing is conducted again; 5, the mycelium leather is filled; according to the method, when a freshly harvested mycelium material is obtained through solid fermentation, a culture medium is coated with gelatin, hydrogen bond and electrostatic interaction can be generated between the gelatin and a chitin / glucan network on the outer wall of mycelia in the growth period of the mycelia, and then the mycelia are subjected to fat liquoring; and a'albumen glue layer 'formed by gelatin can also be used as a template structure to promote ordered growth of hyphae, so that the overall density is improved, and holes and weak binding areas are reduced on a microstructure.

The invention discloses conductive leather based on a TGIC (triglycidyl isocyanurate) / multi-walled carbon nanotube chrome-free tanning agent. The conductive leather comprises a multi-walled carbon nanotube, gamma-glycidyl ether oxypropyl trimethoxy silane, triglycidyl isocyanurate and triethylamine, the preparation method comprises the following steps: performing amination modification on multi-walled carbon nanotubes through KH550, and uniformly dispersing the multi-walled carbon nanotubes under the action of a silane coupling agent; an epoxy group of triglycidyl isocyanurate and an amino group on the surface of the aminated carbon tube are subjected to a ring-opening cross-linking reaction, and a three-dimensional covalent network structure is constructed; and carrying out ethanol precipitation purification and drying treatment to obtain the chrome-free tanning agent. The traditional chromium salt is completely replaced, and the conductivity of the obtained leather is greater than 10 <-4 > S / cm; the mechanical property of the material is excellent, and the tensile strength exceeds 15 MPa; the material has excellent damp-heat resistance stability, and the structure is still stable after being treated at 100 DEG C for 24 hours; the production process is green and environment-friendly, and the cost is reduced by 40% compared with a traditional method. The method is especially suitable for manufacturing intelligent wearable equipment and flexible electronic sensors.

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 present invention relates to a method for antimicrobial protection applied to hides in the tanning process incorporating a biocidal composition and an additive allowing the Identification of its presence by means of a luminescent effect, as well as certifying its originality using luminescence encryption techniques, wherein the composition is added in the tanning process immediately after adding the chromium or titanium salts and in an amount between 0.1 % and 5 % by weight of the material to be tanned and comprises: silver phosphate glass between 3 % and 5 %; silicone in an amount between 1 % and 3.5 %; aliphatic hydrocarbons between 0.1 % and 0.30 %; and water between 90 % and 95 %, and the luminescent additive is added in an amount between 0.1 % and 5 % by weight of the material to be tanned and comprises between 20 % and 40 % silica; alumina in a proportion between 10 % and 30 %; calcium fluoride between 30 % and 50 %; erbium (III) fluoride between 0.5 % and 3 %; ytterbium (III) fluoride between 5 % and 15 %; thulium (III) fluoride in a maximum amount of 5 %; and europium (III) fluoride in a maximum amount of 5 %, with respect to the total weight of the luminescent additive.

The present application relates to the field of furniture leather processing, and more particularly to a greasing process for furniture leather. The greasing process for furniture leather comprises, in sequence: rinsing → chrome retanning → water washing and neutralization → dyeing / greasing → water washing, drum drying. On the one hand, the preparation process of the present application utilizes a relatively stable greasing agent, which reduces volatilization and oxidation of the greasing agent during use, thereby reducing the VOC (Volatilization Oxide) value and atomization value released by the leather and improving the leather's oxidation resistance. On the other hand, during the dyeing / greasing step, the acrylate retanning agent, dicyandiamide, and melamine form a protective film on the surface of the leather embryo that has good adhesion to the leather embryo, filling small holes and defects on the leather surface and reducing the leather's contact with oxygen. Furthermore, the VOC value and atomization value of the prepared leather are reduced, and the oxidation resistance of the leather is improved.

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.

The invention provides a biodegradable polyitaconate fatting agent and a preparation method thereof, and relates to the field of leather auxiliaries. The preparation method of the biodegradable polyitaconate fatliquor comprises the following steps: esterifying itaconic anhydride and vegetable oil under the action of an acid catalyst to generate itaconic acid grease containing double bonds; under the action of an initiator, carrying out free radical polymerization to form polyitaconic acid grease; and finally, neutralizing, so as to obtain the biodegradable polyitaconate fat liquoring agent. According to the biodegradable polyitaconate fatting agent and the preparation method thereof, the problems of environmental pollution, functional limitation and high complexity of a preparation process of a traditional leather fatting agent can be solved, efficient preparation can be carried out by adopting a bio-based material, the bonding performance of the fatting agent and leather fibers is effectively improved, migration and loss are not likely to happen, and the fatting agent has good application prospects. The hydrophobic and plasticizing properties of the fatliquor are further improved; meanwhile, the fatting agent is easy to biodegrade, controllable in degradation rate and high in compatibility with a human body.