2046results about "Leather surface finishing" patented technology

The present invention provides methods and compositions comprising at least one neutral metalloprotease enzyme that has improved storage stability. In some embodiments, the neutral metalloprotease finds use in cleaning and other applications. In some particularly preferred embodiments, the present invention provides methods and compositions comprising neutral metalloprotease(s) obtained from Bacillus sp. In some more particularly preferred embodiments, the neutral metalloprotease is obtained from B. amyloliquefaciens. In still further preferred embodiments, the neutral metalloprotease is a variant of the B. amyloliquefaciens neutral metalloprotease. In yet additional embodiments, the neutral metalloprotease is a homolog of the B. amyloliquefaciens neutral metalloprotease. The present invention finds particular use in applications including, but not limited to cleaning, bleaching and disinfecting.

Engineered animal skin, hide, and leather comprising a plurality of layers of collagen formed by cultured animal collagen-producing (e.g., skin) cells. Layers may be formed by elongate multicellular bodies comprising a plurality of cultured animal cells that are adhered and/or cohered to one another; wherein the elongate multicellular bodies are arranged to form a substantially planar layer for use in formation of engineered animal skin, hide, and leather. Further described herein are methods of forming engineered animal skin, hide, and leather utilizing said layers of animal collagen-producing cells.

The invention discloses a preparation method and application of modified polyurethane aqueous dispersions of polyisocyanate curing agents. The preparation method comprises the following steps of: carrying out prepolymerization reaction by using polyester polyol, vulcabond monomer and a polyisocyanate curing agent; reacting with a hydrophilic chain-extending agent and a micro-molecule chain-extending agent to obtain polyurethane prepolymer containing hydrophilic groups (carboxyl or sulfonic groups) and isocyanate(NCO)-terminated groups; neutralizing the polymer into salt, and then dispersing the salt into water; and preparing the modified polyurethane aqueous dispersions of the polyisocyanate curing agents by the chain extending of a polyamine chain-extending agent. The modified polyurethane aqueous dispersions of the polyisocyanate curing agents have self-crosslinking function at room temperature, and the self-crosslinking density is over 85%. Compared with non-modified polyurethane aqueous dispersions prepared under the same condition, the modified polyurethane aqueous dispersions have superior film forming property, water resistance, alcohol resistance, pollution resistance, cold resistance, dry/wet rubbing resistance and chemical solvent resistance; and coating films have especially high drying speed, high hardness increment speed and high final hardness.

The invention provides a preparation method of a matting leather water-based polyurethane coating agent. According to the preparation method, a polyurethane A component with a cross-linked structure and a large particle size is synthesized, and is mixed with a B component with a small particle size. The A component possesses many molecular branched chains, size of micellar particles is relatively large, and specific gravity of the A component is less than that of the component B; so that the A component will float on film surface, roughness of the film surface is relatively high, delustering effect is achieved, no delustering agent is needed, excellent transparency is obtained after coating, and no influence on leather substances is caused as the delustering effect is achieved.

Color harmonization is provided for articles of manufacture comprising different substrate materials. A coating composition is selected that can be applied to the different substrate materials while maintaining substantially uniform visual characteristics of the article. The substrates may include flexible materials such as natural leather, synthetic leather, vinyl, foam, textiles and the like. Examples of articles of manufacture include footwear, automotive upholstery and automotive interiors.

The invention relates to the technical field of the leather manufacturing technology, and provides a production technology of cow skin nappa leather. A series of problems that due to the fact that the structure of the abdomen and the part between the ribs and the hips of the cow skin is thin and fiber is woven loosely, in the processing process, the part of the abdomen and the part between the ribs and the hips are prone to being excessively loose, the part deviation is large, and face loosening is likely to happen are solved through the production process of the cow nappa soft-face leather. The integral procedure of the technology is simple, easy to achieve, convenient to operate and practical. The grain on the abdomen and the part between the ribs and the hips is easy to open in the tan preprocessing working section of the cow skin through tanning preprocessing, retanning processing and post-tanning mechanical processing, and the whole skin body fiber is even and loose. Even and slow tanning is carried out in the tanning working section, step-by-step and multi-time even filling is carried out in the retanning working section, the whole cow skin leather is even and consistent in the manner that filling is conducted after loosening, the leather is soft but not loose, and the leather yield and the utilization rate of finished cow skin are greatly increased.

A polymer extender composition for use with fluorochemical repellents, said composition comprising monomers copolymerized in the following percentages by weight: (a) from about 60% to about 94% of a monomer, or mixture of monomers, of the formula I:

[CH₃—(CH₂)_p][CH₃(CH₂)_n]CHCH₂—OC(O)—C(R)═CH₂   (I), and

(b) from about 5% to about 20% of a monomer, or mixture of monomers, of the formula II:

H—(OCH₂CH₂)_m—O—C(O)—C(R)═CH₂   (II)

wherein

• • • each R is independently H or CH₃; n is 1 to 10; p is 1 to 20 and m is 2 to 10 is disclosed.

The invention discloses an aqueous polyurethane dispersoid for coating yellowing-resistant leather. The aqueous polyurethane dispersoid is prepared through the following steps: performing reaction on polyalcohol, a diisocyanate mixture and a crosslinking agent to generate a prepolymer with -NCO terminal group, wherein the diisocyanate mixture consisting of dicyclohexylmethane diisocyanate and isophorone diisocyanate is taken as a starting material; adding a hydrophilic chain extender into the prepolymer, further reacting and extending the chain by micromolecular dihydric alcohol; and neutralizing by using triethylamine and dispersing into water to obtain the aqueous polyurethane dispersoid. According to the aqueous polyurethane dispersoid prepared by the method, the yellowing-resistant level can reach more than level 4, the tensile strength is more than or equal to 15 MPa, the elongation ratio is more than or equal to 800 percent and the tearing strength is more than or equal to 50 MPa. The coated leather has soft and natural luster and plump and moist handfeel.

The invention relates to a photosensitive fluorosilicone segmented urethane acrylate oligomer and a preparation method of the photosensitive fluorosilicone segmented urethane acrylate oligomer. The preparation method comprises the steps of: (1) adding a fluorinated acrylate monomer and dialkylol amine into a reactor for reaction for 2-6hours at 20-50 DEG C; (2) adding organic silicon, polyisocyanate and a catalyst into the reactor for reaction for 0.25-2hours at 30-60 DEG C; (3) adding a second step product, a first step product, polyisocyanate and the catalyst into the reactor for reaction for 0.25-1hour at 30-60 DEG C; (4) carrying out reaction of a third step product, olefine acid-hydroxyl ester compounds, a polymerization inhibitor and the catalyst for 2-6hours at 30-80 DEG C; and (5) reducing the temperature and cooling to room temperature, discharging, and keeping in a dark place for later use. The invention has the beneficial effects that (1) the synthesized oligomer has the characteristics of better photosensitiveness, high and low temperature resistance, chemical medium resistance, resistance to pollution, flexibility and the like; (2) a ultraviolet cured leather finishing agent prepared by the oligomer has better adhesive force and low temperature hard fold resistance, does not contain organic solvents, is pollution-free and belongs to an environment-friendly material; and (3) the oligomer is simple in synthetic method, mild in reaction condition and easy to operate.

A natural leather having a three-dimensional pattern formed on the surface thereof is provided. The three-dimensionally patterned natural leather permits a minute three-dimensional expression such as small dots and thin lines, is high in the degree of freedom of the three-dimensional pattern, can retain the three-dimensional pattern even with the lapse of time and retain the characteristics peculiar to the natural leather. The three-dimensional pattern is formed by a resin portion which covers by coating the surface of an undercoating layer of the natural leather partially in a pattern shape. The resin portion has a maximum thickness of 20 to 400 μm.

The present invention provides a preparation method for aqueous polyurethane. The method comprises the following steps: mixing aliphatic diisocyanate, an aliphatic polyol, dimethylol propionic acid and a catalyst, and carrying out a reaction to obtain a prepolymer; adding a neutralizing agent to the prepolymer, and carrying out a stirring reaction to obtain an intermediate product; adding water and a chain extender to the intermediate product, stirring and dispersing to obtain the aqueous polyurethane, wherein the chain extender is polyoxyethylene polyamine or polyoxypropylene polyamine. The invention further provides the aqueous polyurethane prepared by the method. According to the present invention, the bulk polymerization method is adopted, the use of the organic solvent is not required, and no environmental pollution is generated; the polyoxyethylene polyamine or the polyoxypropylene polyamine is adopted as the chain extender, and is used for emulsion chain extending, such that the obtained polyurethane emulsion has good film-forming flexibility, the mechanical property of the obtained polyurethane can not be reduced, the large R value is not required, and the final produced polyurethane film is soft.

The invention relates to a manufacturing process of the semi-vegetable tanned wrinkled leather of cow leather, which comprises the working procedures of initial tanning, deacidifying, vegetable tanning, filling and dry finishing. In the method provided by the invention, firstly tanning is carried out on raw hide by a small quantity of chromium tanning agent and then by a vegetable tanning agent, thereby under the premise of guaranteeing the quality of the leather, greatly reducing the content of chromium in tanning waste liquid, lightening the pollution of the chromium to the environment and effectively inhibiting the generation of hexavalent chromium through the vegetable tanning agent in the leather; and meanwhile, the granule surface of the leather is tightened through the working procedures of dry finishing and coating, and natural winkles are formed on the granule surface, thereby covering the injury of the granule surface of the leather and improving the additional value of the leather.

The invention relates to a method for preparing polyacrylate/nano-SiO2 compound coating agent which is suitable for bottom layer coating in clothing leathers and instep leathers, by using a reactive emulsifier. The polyacrylate has excellent optical stability, chemical resistance and favorable adhesive property and is widely used as an adhesive, a coating film-forming agent, a functional film, and a medical polymer and in the fields of water treatment and the like, but polyacrylate emulsion has the defects of embrittlement at low temperature, stickiness and strength loss at high temperature, easy after tack and the like, which restrict the application range and the use value of the polyacrylate emulsion. In the invention, the polyacrylate/nano-SiO2 compound coating agent is prepared by substituting conventional emulsifier with reactive emulsifier by utilizing the nanometer effect of an inorganic nanometer material and synchronously adopting a conventional emulsion polymerization method and a sol-gel method. The compound coating agent prepared by the invention has fine granules, excellent adhesive force, good filling capacity, strong water resistance and flexible and transparent formed film, and meanwhile, the damages to the human body and the environment, which are caused by the use of large amount of emulsifiers, are reduced.

The invention relates to a polysiloxane-modified gelatin leather finishing agent and a preparation method thereof. The preparation method comprises the steps: dissolving gelatin into water to be prepared into aqueous solution, adjusting the pH of the solution to be 6-12 at 40-70 DEG C, and adding a surfactant, wherein the usage amount of the surfactant is 2-20% the mass of the gelatin; continuing stirring, adding Si-O-Si repetitive unit-containing epoxy-polysiloxane continuously or in batches, wherein the usage amount of the epoxy-polysiloxane is 1.5-10 times the mass of the gelatin; and reacting for 12-24h at 40-70 DEG C to obtain water-based and emulsion type epoxy-polysiloxane-modified gelatin leather finishing agent.

The invention discloses an automatic leather coating machine and an automatic coating method. The automatic coating method comprises the following steps: dividing the coating width of the coating machine into a plurality of coating areas, and at least one spray gun is arranged on each coating area; before coating, acquiring shape information of leather to analyze the coating area of the leather, and coating-start time and total coating time of the spray gun of the coating area; and controlling the coating gun in each coating area to coat at the coating-start time, and stopping coating when the total coating time is used up. The machine and the method realize automatic control of leather coating so as to save usage of coating, and flexibly realize systematic control by changing program so as to greatly reduce production cost, improve product quality and production efficiency, and meet the requirement of modern society to environmental protection and safety on industrial production.

The invention discloses fur brightener composition, which is characterized by comprising, in weight percentage, 5-30% of organosilicone, 0-3% of fatty alcohol, 0.1-3% of high polymer, 1-10% of nonionic surfactant, 0-5% of cathodic or anodic surfactant, 0-1% of preservative and the balance of deionized water. Fur cover treated with the fur brightener composition has well color, looseness, softnessand electrostatic resistance.

The invention relates to a polyacrylate/nanometer ZnO composite finishing agent suitable for the base coating of clothing leathers, instep leathers and corrected leathers and a preparation method of the polyacrylate/nanometer ZnO composite finishing agent. The polyacrylate/nanometer ZnO composite finishing agent comprises the following raw materials by weight: 22wt%-28wt% of acrylic ester monomer, 2wt%-5wt% of emulsifying agent, 0.4 wt%-0.8 wt% of initiating agent, 0.2wt%-1.5 wt% of nanometer ZnO, 0.6 wt%- 5wt% of water-solubility high polymer materials, and the rest of deionized water. The preparation method comprises the following steps of: firstly, carrying out surface modification on the nanometer ZnO by adopting a water-solubility high molecular polymer, enabling the nanometer ZnO tobe uniformly dispersed in a water solution, then triggering the acrylic ester monomer to polymerize in site, and preparing the polyacrylate/nanometer ZnO composite finishing agent. Compared with the pure polyacrylate emulsion, the polyacrylate/nanometer ZnO composite finishing agent has the advantages that the water tolerance, the elongation at break, the air permeability and the water vapor permeability of a finished leather sample are all substantially increased.

The invention relates to the field of the manufacture of leather and provides a process for producing the leather. The production cost is reduced by changing the formula of the process. The process comprises the following steps of: preparing a crust, milling the crust, toggling, tumbling, trimming, patching, buffing, blowing dust and cleaning, spraying cations, tumbling for the second time, spraying, repairing corners, tumbling for the third time, trimming for the second time, rolling, obtaining G gloss, pressing a plate, spraying for the second time, obtaining water gloss, tumbling for the fourth time, milling for the second time, staking, tumbling for the fifth time, and spraying a handle agent.