17results about "Tanning treatment" patented technology

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 present invention provides a method for using a retanning composition containing rice husk in leather processing, the retanning composition providing good retanning behavior.

This invention relates to the field of crystal materials technology, specifically disclosing a wear-resistant and antibacterial composite leather for electronic skin and its preparation method. The composite leather is composed of delimed bare leather, plant polyphenols, glutaraldehyde, lysine-chitosan graft polymer, tannic acid-zirconium coordination oligomer solution, plant-derived wax esters, and lipase. The preparation method includes: adding plant polyphenols and glutaraldehyde to the delimed bare leather for tanning to obtain primary cross-linked raw leather; adjusting the pH and then adding lysine-chitosan graft polymer and tannic acid-zirconium coordination oligomer for an antibacterial mineralization reaction; then adding plant-derived wax esters and lipase for an enzyme-catalyzed transesterification reaction; finally, drying, rehydrating, and softening to obtain the finished product. This invention, through the synergistic effect of multi-stage processes including composite tanning, synergistic antibacterial action, and enzyme-catalyzed lubrication, enables the composite leather to possess excellent wear resistance, long-lasting antibacterial properties, high breathability, and good softness, making it suitable for wearable devices such as electronic skin and showing promising application prospects.

This invention relates to the field of leather processing technology and discloses a tanning process for all-vegetable tanned cowhide floor leather, comprising the following steps: pre-treating raw hides followed by acid immersion pre-tanning, tanning, intermediate treatment, retanning, and post-treatment to obtain finished leather; a first pre-tanning agent is added during the acid immersion pre-tanning process; the tanning process includes the following steps: adding water and the first tanning agent to a groove and rotating; adding a second tanning agent and rotating; adding a third tanning agent and rotating; adding a fourth tanning agent and rotating; adding a fifth tanning agent and rotating; then transferring to a drum, adding water and a sixth tanning agent and rotating; adding a seventh tanning agent and rotating; the retanning process includes the addition of a first retanning agent and a second retanning agent. This invention uses a combination of groove immersion and drum tanning, which greatly shortens the tanning time, reduces the floor space required, and saves labor costs.

This invention discloses a pH-responsive MOF nanocomposite chromium-free tanning agent, its preparation method, and its application, belonging to the technical field of chromium-free tanning agents for leather. The method disclosed in this invention involves forming a ligand with a borate ester module through the dehydration condensation of 4-carboxyphenylboronic acid and tartaric acid, and then binding zirconium to the ligand via a solvothermal method to form a MOF tanning agent. Subsequently, zirconium tartrate is loaded onto the MOF, enabling controlled release of zirconium tartrate through a pH-responsive switch in the ligand. This improves the problem of uneven tanning caused by the rapid and strong binding of zirconium ions to collagen fibers, resulting in tanned leather with a shrinkage temperature exceeding 80 °C, thereby effectively improving the quality of zirconium-tanned leather products.

A kind of drum pneumatic door device, including the drum with feeding opening, the outer wall of drum is fixed with two parallel tracks in circumferential direction, drum door is slidably installed in the inside of track, the inside of track is equipped with inflatable rubber strip, the outer wall of drum is fixed with pneumatic motor, pneumatic motor is configured to drive drum door to move along track between closed position and open position, and when drum door is located in closed position, feeding opening is closed by drum door, when drum door is located in open position, feeding opening is opened, through the cooperation of air pump, pneumatic motor, actuator and limit rod, through electric signal input, air pump carries out pumping or pumping operation, and through the cooperation of pneumatic motor and actuator, the opening and closing of drum door and the inflation and deflation of inflatable rubber strip are completed, without using manpower to open and close drum door, solve the problem of time-consuming and laborious of feeding operation personnel to open and close drum door.

This invention relates to a high-utilization eco-friendly leather manufacturing process using salted wet cowhide as raw material, comprising the following steps: pre-soaking → fleshing → main soaking → enzymatic hair removal → liming → leveling → splitting → deliming → softening → pre-tanning → pickling → main tanning → settling → chromium-free retanning → neutralization → filling and dyeing → fatliquoring → over-dyeing → squeezing and stretching → drying → rewetting → softening → flattening → finishing → finished leather. The wet dyeing and finishing and dry finishing sections of this application employ simplified processes with low filler and oil usage. Due to reasonable formulation, the cost is low, yet the performance is good, meeting production requirements. The addition of a "leveling" step reduces the amount of raw material processed and facilitates processing. The finishing system is water-based, resulting in low VOC generation. Graphene is introduced into the finishing agent, resulting in low coating weight and good coating effect.

The invention relates to a tanning and / or retanning process for leather or a leather intermediate, comprising the steps of A tanning and / or retanning process for leather or a leather intermediate, comprising the steps of a) (i) tanning after a pre-treatment step and / or (ii) retanning after (ii.1) a pre-treatment step or (ii.2) with a parallel or (ii.3) subsequent treatment step, wherein the treatment or pre-treatment steps comprise adding to the leather intermediate in an aqueous medium a composition containing biopolymer microbeads in form of an aqueous dispersion or a dry powder, having a particle size, determined by laser diffraction based on volume density, with a Dv(90) in the range from 1 to 500 µm;; and b) working up and drying the resulting wet leather.

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.

The present application relates to the technical field of water-based leather treatment agent production, and particularly relates to a temperature adjusting device for water-based leather treatment agent production and a use method thereof, which comprises a temperature adjusting box, a discharge pipe in communication with the bottom of the temperature adjusting box, and an electric heating rod arranged on the surface of the temperature adjusting box, and the surface of the temperature adjusting box is provided with a cooling assembly. The first blade driven by the stirring rod of the worm and the worm wheel cooperates with the gear transmission, realizes radial stirring and axial circulation of the material, the guide cylinder is periodically deflected by the servo motor, the reciprocating screw rod and the swing assembly, the flow direction of the circulation path is dynamically changed, three-dimensional mixing without dead angle is formed, the self-cleaning effect of the cleaning roller on the heat exchange surface and the reinforced heat dissipation of the auxiliary heat dissipation mechanism are combined, the heating and cooling efficiency of the device is greatly improved, rapid, accurate and uniform temperature control of the water-based leather treatment agent is realized, and the product quality and production efficiency are effectively improved.

The utility model relates to the field of leather fabric preparation technology, including temperature control mechanism, the right side of temperature control mechanism is provided with leather grinding mechanism, the right side of temperature control mechanism is provided with drying mechanism, the left side of drying mechanism is arranged with leather grinding mechanism, temperature control mechanism includes bottom plate, the top fixedly connected with conveyer belt of bottom plate, the top fixedly connected with tanning machine of bottom plate, the left side of tanning machine is combined with heater, the bottom of heater is fixedly connected with bottom plate, the front and back sides of heater are fixedly connected with heating pipe respectively, the outside of heating pipe is provided with temperature -sensitive tube, the front and back sides of tanning machine are fixedly connected with fin respectively, the fin is combined with temperature -sensitive tube. The utility model discloses through fin array enlargies heat exchange area, realizes the quick even temperature of tanning machine, and the adapter optimizes heat energy distribution, avoids local overheating or temperature uneven, solves the problem that leather shrinkage temperature is low.

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.

The application discloses a kind of breathable wear-resistant leather upper materials and preparation method thereof, and the application belongs to leather product technical field field.The material includes ultra-thin wear-resistant coating, grain layer, net-shaped reinforcing layer, leather base from top to bottom successively;The leather base is head layer cowhide, and inside natural collagen fiber is retained through micropore channel;The net-shaped reinforcing layer is dense fiber network formed by acrylic retanning and nano-silicon dioxide compound, and is located on the upper part of leather base;The grain layer retains natural through pore;The ultra-thin wear-resistant coating is water-based polyurethane coating, light and thin and does not block pore.The application has simple structure, breathable stability, high wear resistance, and is suitable for upper use.

The present application relates to a kind of method for preparing polycation electrolyte skin-based conductive hydrogel using chrome-free tanning blank.The method uses the aqueous solution of cationic monomer and initiator to impregnate treatment chrome-free tanning blank, stirs 4~48 hours under 5~30 ℃, then chrome-free tanning blank is heated at 40~85 ℃ for 2~12 hours, and polycation electrolyte skin-based conductive hydrogel is obtained.The method uses the basic framework of high mechanical strength chrome-free tanning blank for hydrogel, and the polyelectrolyte three-dimensional network formed by in-situ polymerization of cationic monomer forms network interpenetrating structure with the three-dimensional crosslinking network of collagen fiber of chrome-free tanning blank, thereby the mechanical strength of polycation electrolyte skin-based conductive hydrogel is improved, and the defects of poor network stability and insufficient mechanical strength of traditional polyelectrolyte-based conductive hydrogel are effectively solved.The raw material of the present application is widely available, low in cost, and simple in preparation process, and easy to realize industrialization preparation.

The present invention relates to a tanning agent consisting of a polymer of at least: - 0.01 to 12 mol% of N-methylol(meth)acrylamide; and - 50 to 99.99 mol% of at least one anionic hydrophilic monomer.

The application discloses a cage type silsesquioxane-metal complex tanning agent and a preparation method thereof, and steps are as follows: step 1, zirconium salt and P (POSS-MAA) are respectively completely dissolved in DMF and deionized water, are transferred into a round-bottom flask after sufficient stirring, formic acid is added into the round-bottom flask, the round-bottom flask is sealed after uniform stirring, and the round-bottom flask is placed in a water bath for stirring reaction; step 2, the system after reaction in step 1 is cooled to room temperature, white solid products are obtained through centrifugal separation, and the white solid products are alternately washed through centrifugal separation using DMF and acetone, and then the white solid products are transferred into a vacuum drying box for drying, so that the cage type silsesquioxane-metal complex tanning agent is obtained. The tanning agent can effectively inhibit rapid hydrolysis and polymerization of zirconium ions, and has high crosslinking strength and strong structural stability.