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42 results about "Tanning tanning" patented technology

Sun tanning or simply tanning is the process whereby skin color is darkened or tanned. It is most often a result of exposure to ultraviolet (UV) radiation from sunlight or from artificial sources, such as a tanning lamp found in indoor tanning beds.

Salt-free pickling-free less-chrome combination tanning method for first layer cattle shoe upper leather

InactiveCN103509888APromote absorptionReduce the content of chromium trioxideTanning treatmentLiquid wasteTanning tanning
The invention relates to a salt-free pickling-free less-chrome combination tanning method for first layer cattle shoe upper leather. In a conventional chrome tanning process, the chromic oxide content in liquid waste with 7 percent of tanned chromium powder is 2000-3000 mg / L, harm is caused to the environment and human health, and the tanning cost is increased due to the shortage of chromium resources. According to the method, an amphoteric polymer-based nano composite less-chrome tanning aid is matched with 3-5 percent of chromium powder to be applied to the tanning process of the first layer cattle shoe upper leather, the shrinkage temperature of wet blue is over 95 DEG C, and the chromic oxide content in the tanned liquid waste is 0.21 g / L and is reduced by 80.5 percent compared with the conventional 7 percent of chromium powder tanning. The tensile strength of crust leather is increased by 38.5 percent compared with that of the conventional 7 percent of chromium powder tanning, and the tearing strength is increased by 50.1 percent. The chromic oxide content in the wastewater can be effectively reduced, the amount of chrome tanning agents is reduced, the use of salts and acids in the tanning process is avoided, and the pollution of chrome tanning liquid waste is reduced.
Owner:SHAANXI UNIV OF SCI & TECH

Fur tanning agent based on isocyanate and preparation method of fur tanning agent

The invention discloses a fur tanning agent based on isocyanate and a preparation method of the fur tanning agent. According to the process, diisocyanate molecules are adopted to perform end-capping on two ends of fat-diol or polyether glycols in a mixed solution under the condition of catalysis, and prepolymer with high selectivity and high conversion rate is obtained; then, hydrosulphite is adopted to protect isocyanate groups on two ends of the prepolymer, the water solubility of the compound is increased, and the tanning agent is obtained finally. The molecular weight of the tanning agent can be controlled, thereby being applicable to tanning of furs with different fibrous textures; during the tanning process, the fur tanning agent can effectively permeate to the position among the fur collagen; hydrosulphite decomposes under the condition of raised temperature and raised alkali, the tanning agent molecule expose the isocyanate group to cause the isocyanate group to react with the amino group on the collagen molecule, crosslinking of the fur collagen is realized, and the purpose of tanning is achieved; only neutral salt is released during the entire process, heavy metal ions or free aldehyde groups are not generated, the process is simplified, the fur tanning agent is environment friendly, the price is low, the fur tanning agent is very suitable for fur, especially tanning of rabbit fur with light color.
Owner:SICHUAN UNIV

Nano tanning agent based on structural memory effect, preparation method and applications thereof

ActiveCN111004877AUnique structure memory effectLarge specific surface areaTanning treatmentTanning tanningFreeze-drying
The invention discloses a nano tanning agent based on a structure memory effect, a preparation method and applications thereof. A purpose of the invention is to increase the specific surface area of atanning agent and enhance the adsorption performance. According to the technical scheme, the preparation method of the nano tanning agent based on the structure memory effect comprises: respectivelyweighing magnesium nitrate and aluminum nitrate, and dissolving in water to prepare a metal salt solution A; dissolving sodium carbonate in water to prepare a sodium carbonate solution B; and adding the solution A into the solution B in a dropwise manner, regulating the pH value to 10-12 by using a sodium hydroxide solution, carrying out nucleating crystallizing for 10 hours at a temperature of 75DEG C, centrifuging, freeze-drying, and calcining the obtained product for 2-4 hours at a temperature of 350-450 DEG C to obtain the nano tanning agent. According to the invention, the prepared nanotanning agent has a unique structural memory effect; and in a tanning process, the nano tanning agent is assembled with leather collagen fibers to form an organic / inorganic nano hybrid material by adjusting the external environment, so that the shrinkage temperature of crust leather is increased.
Owner:SHAANXI UNIV OF SCI & TECH

Method for improving absorptivity of chrome tanning agent in tanning process through microwave irradiation pretreatment

The invention provides a method for improving the absorptivity of a chrome tanning agent in the tanning process through microwave irradiation pretreatment. The method is characterized by comprising the following steps: dissolving a chrome tanning agent in water to prepare chrome tanning liquid with certain concentration; raising the temperature to 30 to 50 DEG C by utilizing microwave irradiationunder a stirring condition; stirring and carrying out heat preservation treatment for 30 to 150 minutes at the temperature; then adding the treated chrome tanning liquid into a rotating drum and adding a certain amount of neutral salt; after the drum is rotated until the neutral salt is completely dissolved, a proper amount of pickled bare leather can be put into the drum to be subjected to chrometanning according to a conventional method, the weight of the bare leather is 100-200% of the weight of tanning liquid, and parameters such as tanning agent dosage, liquid ratio, temperature, time and pH value in the chrome tanning process are the same as those of conventional chrome tanning. By adopting the method provided by the invention, the chromium absorption rate in the tanning process canbe remarkably improved, and the chromium content in the wastewater is reduced. Materials used in the method are chemical raw materials commonly used in the tanning industry, the influence of the technical scheme on existing chrome tanning operation is small, and the practicability is high.
Owner:SICHUAN UNIV

A pass-through metal salt tanning method based on ultrasonic and microwave assistance

InactiveCN107488760BTanning speed increasedAdjust process parametersTanning treatmentUltrasound - actionTanning tanning
The invention provides an ultrasonic wave and microwave assisted pass-type metal salt tanning method. The method comprises the following four steps: (1) regulating the pH value of pickled pelt firstly to be at least 3.5, extruding by adopting a roller type extruding machine, and regulating the distance between the extrusion rollers to be 40%-60% of the initial thickness of the pickled pelt; (2) enabling the grain side of the pickled pelt after extrusion to face downwards to pass through a metal salt tanning solution containing sodium chloride, tanning under the action of 40 KHz ultrasonic waves for at least 1 min, extruding the crust leather by adopting the roller type extruding machine, and further regulating the distance between the extrusion rollers to be 40%-60% of the initial thickness of the pelt; (3) repeating the operations in the step (2) for 1-3 times, and no longer extruding by adopting the roller type extruding machine after the last time tanning; and (4) performing heat preservation on the crust leather after the completion of operations in the step (3) in a microwave field for at least 2 min at the heat preservation temperature of 30-60 DEG C. The ultrasonic wave and microwave assisted pass-type metal salt tanning method is applicable to tanning adopting various metal salts, the tanning time is short, and the physical and chemical property of the obtained leather have no obvious difference compared with that obtained by adopting the conventional method; besides, the tanning solution in the method is recyclable, and waste water containing a tanning agent is not discharged during the tanning process.
Owner:SICHUAN UNIV
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