100results about How to "Improve tanning effect" patented technology

The invention relates to a preparation method of a chromium-free tanning agent, comprising the following steps: adding a hydrophilic group containing active compound and deionized water into a four-necked flask, neutralizing with sodium hydroxide, continuously stirring till dissolution, putting into an ice bath, adding cyanuric chloride, and regulating the pH value of the system with a solution of an acid binding agent to obtain a mixture A; heating the mixture A, dropwise adding p-hydroxy benzaldehyde dissolved in acetone while stirring, regulating the pH value of the system with the solution of the acid binding agent, and continuing the reaction after the materials are added; heating the system, dropwise adding p-hydroxy benzaldehyde dissolved in acetone, regulating the pH value of the system with the solution of the acid binding agent, continuing the reaction after the materials are added, cooling and discharging to obtain a mixture B; and filtering the mixture B, carrying out vacuum drying on the filter cake to obtain solid C, grinding and pulverizing the solid C to obtain the white powdered form chromium-free tanning agent. The chromium-free tanning agent can eliminate pollution from chromic salt, aluminum salt and formaldehyde and can be well absorbed, and the tanned crust leather has a white fine grain surface and is easy to be dyed into light-colored leather.

The invention discloses an oxidized graphene and trivalent chromium composited tanning agent. The oxidized graphene and trivalent chromium composited tanning agent is prepared from the following raw materials in parts by weight: 50-60 parts of oxidized graphene nanosheet dispersion liquid, 6-8 parts of potassium dichromate, 10-15 parts of sodium carbonate, and 0.5-0.1 part of a dispersing agent. The invention further discloses a preparation method of the oxidized graphene and trivalent chromium composited tanning agent. The leather tanning agent disclosed by the invention has the advantages of low dosage for tanning, high absorptivity and low residual amount of a chromium compound in the waste liquor; furthermore, the production technology for the tanning agent is special, the technical process is easy to operate, and the tanning agent is of a good application prospect.

The invention relates to an all-component wide-distribution organic polyaldehyde tanning agent and a preparation method thereof. The preparation method is characterized in that firstly, periodate is utilized to perform hydroformylation on polysaccharide and derivatives thereof under a proper condition, so as to retain all components of hydroformylated polysaccharide; secondly, an inorganic reducing agent is utilized to efficiently convert an iodine-containing compound into solid molecular iodine, and the solid molecular iodine is filtered and recycled; and finally, the hydroformylation product filtrate is subjected to heat treatment, so that the residual iodide is separated out in the form of steam, further absorbed by a NaOH solution and recycled, and the all-component wide-distribution organic polyaldehyde tanning agent is obtained. According to the all-component wide-distribution organic polyaldehyde tanning agent and the preparation method thereof, the technical problems that the conventional hydroformylated polysaccharide tanning agent is too narrow in molecular weight distribution and poor in tanning property, or contains the iodine-containing compound and affects the overall performance of leather after tanning are solved; besides, the prepared tanning agent retains all components of hydroformylated polysaccharide, the molecular weight distribution is wide, the shrinkage temperature of leather/fur after tannage can reach 85-90 DEG C, and the treated leather is pure white, full and soft.

The invention provides a chrome-free tanning method of alligator skin. The chrome-free tanning method comprises the following steps of (1) adding water and sodium chloride to a rotary drum or a paddle vat, adding a pickling alligator skin blank after the sodium chloride is dissolved, rotating the rotary drum or paddling a paddle plate for 5-10 minutes, and regulating the pH value of a mixed solution inside the rotary drum or the paddle vat to 3.4-3.7; (2) adding an organic phosphonium salt tanning agent, an alcamines compound and fatty aldehyde to the rotary drum or the paddle vat, then rotating the rotary drum or paddling the paddle plate for 10-20 minutes, standing for 30-60 minutes, and repeating the operation of rotating the rotary drum or paddling the paddle plate and standing till the alligator skin blank is fully impregnated; (3) regulating the pH value of the mixed solution inside the rotary drum or the paddle vat to 5.8-6.2, then rotating the rotary drum or paddling the paddle plate for 5-10 minutes, standing for 30-60 minutes, and repeating the operation of rotating the rotary drum or paddling the paddle plate and standing for 3-5 times, then standing for 6-12 hours, and then completely discharging the mixed solution; (4) adding the water and an oxidizing agent to the rotary drum or the paddle vat, then rotating the rotary drum or paddling the paddle plate for 5-10 minutes, standing for 30-60 minutes, and repeating the operation of rotating the rotary drum or paddling the paddle plate and standing for 3-5 times.

The invention provides a preparation method of high-performance carbon nanotube modified chrome tanning agent, which comprises the following steps of: after mixing a carbon nanotube with an acid solution, and ultrasonically processing the mixture to prepare a suspension; then, heating, condensing, refluxing, repeatedly washing and centrifugally separating until the pH value becomes neutral; subsequently, after dissolving dichromate in water, slowly adding sulfuric acid and the treated carbon nanotube; ultrasonically processing to prepare a stable suspension; taking glucose and adding water to dissolve the glucose; dropwise adding the water solution of glucose into the suspension containing dichromate while stirring so as to produce a carbon nanotube modified chrome tanning liquid in-situ; and finally, settling and placing for long time. The chrome tanning agent enhances the bonding force of chrome, increases the quality and the properties of leather, is friendly to environment, reduces pollution and decreases resource waste.

The invention discloses an amino modified glycosyl aldehyde tanning agent, which is prepared from the following raw materials in parts by weight: 100 parts of a glycosyl aldehyde tanning agent and 4-10 parts of an amino compound; according to the preparation method of the amino modified glycosyl aldehyde tanning agent, after first-step reaction is finished, direct filtration and separation can be carried out to respectively obtain the high-concentration glycosyl aldehyde tanning agent and an iodate precipitate, the preparation process is simplified, and the preparation cost of the amino modified glycosyl aldehyde tanning agent is obviously reduced.

The invention relates to a preparation method of a formaldehyde-free leather synthetic tanning agent by enzymatic synthesis. Firstly, p-hydroxybenzoic acid and poly hexanediol are reacted to produce ester, then p-hydroxybenzoic acid macrogol ester, p-hydroxybenzaldehyde and sodium phenolsulfonate are dissolved in deionized water, the pH value of the system is adjusted with a sodium bicarbonate solution, and finally copolymerization is carried out under the catalytic action of horseradish peroxidase (HRP) to obtain the formaldehyde-free leather synthetic tanning agent. Through ester producing reaction and combined polymerization, aldehyde group, carboxyl and phenolic hydroxyl which have tanning effect on leather collagen fibers and polyethylene glycol branched chains, sulfo group and the like which have the functions of penetration, lubrication and filling are introduced into the product structure, and the obtained product has moderate relative molecular weight, good permeability and high absorption rate, and is a pollution-free polymer tanning agent with green performance.

The invention discloses a method for preparing a chromium-containing hydrotalcite nano tanning agent from chrome tanning waste liquid, and aims to solve the problem that the chrome tanning waste liquid pollutes the environment. According to the technical scheme, the method for preparing the chromium-containing hydrotalcite nano tanning agent by utilizing the chrome tanning waste liquid comprises the following steps: utilizing the chrome tanning waste liquid, adopting a coprecipitation method, and controlling the molar ratio of divalent metal ions to chromium ions to prepare the chromium-containing hydrotalcite nano tanning agent. The chromium-containing hydrotalcite nano tanning agent prepared by the method has excellent tanning performance, the shrinkage temperature of tanned crust leather is greater than or equal to 85 DEG C, the tensile strength and the tearing strength are both improved, and the biodegradability of tanning waste liquid using chromium-containing hydrotalcite is improved.

The invention provides a method for making book-binding leather from rabbit skin. According to the method, preservative-treated rabbit skin or fresh rabbit skin is soaked in water and subjected to meat removal to obtain a rabbit skin blank as a raw material. The method comprises the following steps: (1) liming and depilation, (2) deliming, (3) pickling, (4) tanning, and (5) retanning, finishing and coating. The method provided by the invention provides a new way of utilization of rabbit skin, provides a reasonable way of effective and reasonable utilization of rabbit skin, especially low-end and defective rabbit skin, and can reduce the waste of rabbit skin resources and avoid environmental pollution caused by abandonment of low-end and defective rabbit skin. The invention further provides book-binding leather made from rabbit skin according to the method, the book-binding leather made from rabbit skin has full dermatome and flat and fine grain, has no obvious location difference, and cannot suffer from the problem of loose grain easily during the making and using process.

The invention provides a fur tanning method based on a bio-based epoxy active tanning agent, the method comprises the processes of softening, pickling and tanning, or comprises the processes of softening and tanning, and comprises the following steps: (1) putting pretreated fur into softening liquid in a paddle-tumbler for softening; after softening, pickling and then tanning, or directly tanning after softening; (2) pickling: adding organic acid and inorganic acid into the softening liquid in the paddle-tumbler to form pickling liquid for pickling; and (3) adjusting the pH value of the pickled or softened bath liquid to 2.0-5.0, adding a tanning aid and a bio-based epoxy active tanning agent, paddling a paddle for 20-40 minutes, then intermittently paddling for 6-8 hours, standing for 12-15 hours, adding a basifier into the bath liquid to extract alkali, adjusting the temperature of the bath liquid to 35-50 DEG C, intermittently paddling for 2-3 hours, standing for 12-15 hours, and discharging the fur. According to the method, the problems of chromium and formaldehyde residues and pollution existing in an existing fur tanning method can be solved, and the quality of the fur plate and the fur quilt of the tanned fur can be improved.

The invention belongs to the field of leather processing, and particularly relates to a tanning machine for leather processing. The tanning machine for leather processing achieves the aims of continuously stirring leather in the soaking process and repeatedly tanning the leather in the soaking process and comprises a bottom plate, a supporting rod, an annular sliding rail, a sliding block, a tanning frame, a water outlet pipe, a water valve, a water draining pipe, an L-shaped mounting frame, an outer gear ring, a motor, a fixed plate, a first bearing pedestal, a first rotating shaft, a gear, asecond bearing pedestal, a worm, a first supporting rod, a third bearing pedestal, a second rotating shaft and a worm gear. The annular sliding rail is fixedly connected to one side of the top of thebottom plate through the supporting rod, and the L-shaped mounting frame is fixedly connected to the other end of the top of the bottom plate. The aims of continuously stirring the leather and repeatedly tanning the leather in the soaking process can be achieved.

The invention provides a novel auxiliary agent used in leather pickling process and usage of the novel auxiliary agent. This additive contains organic acid compounds, fatty alcohol polyoxyethylene ether surfactants, alkylbenzene sulfonate surfactants and calcium and magnesium ion chelates. This additive is used in the pickling process of the leather industry, which can effectively improve the absorption of chromium, reduce the use of chromium powder, and at the same time improve the yield and tensile strength of leather. In the low pH value, it can avoid the damage of high mechanical action to the leather surface, and can also improve the firmness, fineness and softness of the leather grain. Especially it has obvious effect on skin samples that have not been deashed in the previous process.

The invention discloses a gold plating process of a bottom hair tip of a Tibet lamb skin quilt. The gold plating process comprises the steps of degreasing, tanning, mordanting, bleaching, removing iron, plating gold and performing aluminum tanning. According to the process, bottom hair is degreased and tanned and then is mordanted, and the hair is bleached with a degreasing agent, ferrous sulfate and acetic acid by standing overnight, so that a pH value of tanning liquid is increased, the optimal tanning effect is achieved, and the hair is soft by utilizing a bleaching agent in a post-degreasing procedure. Additionally, when gold is plated on the tip of the skin quilt, reduction treatment is performed at moderate temperature with ammonium hydroxide, the bleaching agent, a hair protecting agent and hydrogen peroxide, and finally, a fatting agent is added by adopting aluminum tanning, so that the appearance of the skin quilt is enhanced, the skin quilt is glossy, and the skin quilt with moderate hair thickness has the sense of color layers. By adopting the gold plating process, the problem of singleness in dyeing the Tibet lamb skin quilt is solved, the hair is soft, the appearance of the skin quilt is enhanced, the skin quilt is glossy after being dyed and has the sense of color layers, the additional value of Tibet lamb skin products is increased, and the application range of the Tibet lamb skin products is enlarged.

The invention discloses an automatic tea leaf sun-drying system, and relates to the technical field of tea making equipment. The automatic tea leaf sun-drying system comprises a sun-drying field for sun-drying tea leaves and trays for containing the tea leaves, and further comprises a carrying device for carrying the trays. The carrying device is provided with wheels for moving one part or the whole of the carrying device, a driving mechanism for driving the wheels to run, and a horizontal component for lifting up the trays. Thus, the automation of the tea leaf sun-drying process is realized,the problem of secondary contamination during manual tea leaf sun-drying is reduced, and the tea leaf sun-drying quality is improved.

The invention discloses a method for tanning leather by an external electric field. The method comprises the following steps: firstly, carrying out deacidification treatment on pickled leather; then adding an organochlorine tanning agent and a tanning aid, and tanning for the first time, wherein the organochlorine tanning agent is a mixture of (E)-4-(3,4,5-trichlorophenyl)butyl-3-enitrile and (E)-4,4'-(ethylene-1,2-diyl)bis(2,6-dichlorobenzoic acid), the (E)-4-(3,4,5-trichlorophenyl)butyl-3-enitrile is formed by reacting (3,4,5-trichlorophenyl)boric acid with 3-butyronitrile, and the tanningagent selects a mixture of N,N'-diallyl L-tartardiamide, diethylene glycol dimethacrylate and 2-hydroxyhexanedial; and then adding a zirconium tanning agent to carry out further tanning on the leather. In the whole tanning process, no chromium-containing substance is used, and chromium pollution cannot be generated, so the whole tanning process is green and environmentally friendly; the method hasa good tanning effect on the leather, so that the shrinkage temperature of the leather reaches 101 DEG C; and method makes the leather have high tearing strength and elongation at break.

The invention discloses a tanning device for leather processing. The tanning device comprises a box body. A rack cavity, an up-down sliding cavity and a treatment cavity are formed in the box body; arack is fixedly mounted on the left end surface of the rack cavity; an up-and-down sliding block is arranged in the up-and-down sliding cavity in a sliding mode, an up-and-down sliding motor is fixedly installed on the up-and-down sliding block, an up-and-down sliding shaft is arranged on the up-and-down sliding motor in a backward power mode, an up-and-down sliding gear is fixedly installed on the up-and-down sliding shaft, and the up-and-down sliding gear is meshed with the rack. According to the device, leather can be in uniform contact with the tanning agent in a manner of shaking up and down in the soaking pool through the convex blocks and the tanning effect is good; the detachable large filter screen is laid in the soaking pool, garbage is prevented from entering the discharging pipeline and the garbage can be fished out; in addition, the tanning device is further provided with the hot air drying and exhausting device, air drying of leather is accelerated, impurities in air arecollected and pollution is reduced.