14results about How to "Facilitate cross-linking" patented technology

The invention relates to the technical field of drying ovens for processing, and discloses a drying oven for water-based PU leather processing and a drying method.The drying oven comprises a preheating cavity and a primary drying cavity formed in one side of the preheating cavity, a main cavity is fixedly assembled on the side, away from the preheating cavity, of the primary drying cavity, and a final drying cavity is fixedly assembled on the side, away from the primary drying cavity, of the main cavity; a sliding rail mechanism is fixedly mounted on the inner side wall, perpendicular to the primary drying cavity, of the preheating cavity, a winding roller is slidably assembled on the side, away from the preheating cavity, of the sliding rail mechanism, and a medium-wave infrared lamp tube is fixedly mounted at the top end, facing the winding roller, of the interior of the preheating cavity. A first lamp tube set is fixedly installed on the inner side wall, perpendicular to the medium-wave infrared lamp tube, of the primary drying cavity. According to the invention, a sectional structure of the preheating cavity, the primary drying cavity, the main cavity and the final drying cavity is adopted, and differential heating assemblies of all the cavities are matched, so that a gradient drying process is realized, and the defects caused by rapid drying of a single cavity are thoroughly avoided.

This invention discloses a fermentation control method for adjusting the gluten protein network structure, relating to the field of food processing technology. It aims to solve the problem of the difficulty in stably constructing an ideal gluten protein network structure using existing technologies. The method includes the following steps: S1, selecting high-gluten wheat flour with a protein content of 12%-15%, and mixing it with water at a ratio of 1:0.5-0.6 to form a dough; S2, placing the dough in a static magnetic field environment with an intensity of 0.5-1.0 mT for 15-30 minutes; S3, transferring the dough to an environment with a temperature of 28-30℃ and a relative humidity of 70%-75% for a first fermentation of 60-90 minutes; S4, after the first fermentation, gently folding the dough 3-5 times, and then letting it rest for 10-15 minutes; S5, placing the dough again in an environment with a temperature of 32-35℃ and a relative humidity of 75%-80% for a second fermentation of 30-45 minutes. This invention has the advantage of making the gluten network structure formed in the dough during fermentation more uniform and dense.

The application provides a flame-retardant composite PVC alloy material and a preparation method thereof, and belongs to the technical field of flame-retardant materials.The flame-retardant composite PVC alloy material contains PVC, AS and ZnCl2 in components;in a combustion process, ZnCl2 can interact with the structure generated by the dehydrochlorination of PVC, the nitrile group of the acrylonitrile unit in AS and the aromatic structure of the styrene unit, promotes crosslinking of chain segments, cyclization of the nitrile group and aromatization reaction, and makes more combustible cracking products be converted into condensed phase residual carbon.At the same time, the existing technical prejudice that AS is flammable and flame retardant of PVC can only add flame retardant is overcome.Through the ingenious cooperation of the functions of the three components of PVC, AS and ZnCl2, the effect of jointly improving the flame-retardant property of the material is achieved.The flame-retardant composite PVC alloy material has good compatibility of components, uniform and excellent flame-retardant effect, no migration segregation, and no toxic gas generated in the combustion process.

The application discloses a hard carbon negative electrode active material and a preparation method and application thereof. The preparation method of the hard carbon negative electrode active material comprises the following steps: (1) dissolving gelatin and a reducing sugar in water to obtain an electrostatic spinning solution; (2) performing electrostatic spinning on the electrostatic spinning solution by taking an aluminum foil as a receiving base material to obtain an electrostatic spinning nanofiber membrane, and then performing standing to completely volatilize water, so that a gelatin-based nanofiber negative electrode precursor is formed; and (3) performing pre-carbonization treatment on the gelatin-based nanofiber negative electrode precursor in a nitrogen atmosphere, and then performing high-temperature carbonization, so that the hard carbon negative electrode active material is obtained after cooling. The hard carbon negative electrode active material prepared by the method can realize the controllability of the pore structure and the carbon-hydrogen microstructure of the hard carbon negative electrode active material, the prepared hard carbon negative electrode active material does not need a support body and a binder, the weight and the volume of the electrode can be reduced, and the overall energy density and the power density of the battery can be improved.

This invention relates to the field of food processing technology and discloses a method for improving the stability and bioavailability of astaxanthin by combining piperine with a whey protein fibrillary-algin complex. The method specifically includes the following steps: S1. Preparation of whey protein fibrillary; S2. Loading piperine onto whey protein fibrillary; S3. Complexation of piperine-loaded whey protein fibrillary with sodium alginate; S4. Preparation of an astaxanthin-piperine co-encapsulated emulsion. This invention constructs a three-dimensional network resistant to pepsin hydrolysis through electrostatic complexation; enhances the effective concentration of piperine in the intestine through co-encapsulation, efficiently regulating the expression of P-gp efflux transport proteins and the transmembrane absorption of astaxanthin; and utilizes the functional property of piperine to inhibit the activity of P-gp efflux transport proteins to achieve efficient absorption of astaxanthin.

To provide a fluorinated elastic copolymer in which the contents of metal elements and chloride ions are low, and a method for producing a fluorinated elastic copolymer, whereby it is possible to obtain a fluorinated elastic copolymer in which the contents of metal elements and chloride ions are low. A fluorinated elastic copolymer in which the content of metal elements is at most 20.0 ppm by mass and the content of chloride ions is at most 1 ppm by mass; and a method for producing a fluorinated elastic copolymer, which comprises coagulating a fluorinated elastic copolymer in a latex containing the fluorinated elastic copolymer by using an acid containing no metal elements or no chloride ions, and washing the coagulated fluorinated elastic copolymer with a liquid medium having a content of metal elements of at most 2.0 ppm by mass and a content of chloride ions of at most 2 ppm by mass.

This invention discloses a high-adhesion UV-cured waterproof printing process for paper printed materials, belonging to the field of printing technology. The process includes vacuum dehydration of hydroxyl-terminated hyperbranched polyester, followed by reaction with isophorone diisocyanate using a catalyst to obtain a prepolymer; then, partial reaction with hydroxyethyl acrylate and monohydroxyl-terminated polydimethylsiloxane, followed by reaction with a silane coupling agent until the isocyanate peak disappears, yielding a modified resin; under light and water-protected conditions, the resin, reactive diluent, photoinitiator, fluorocarbon modified acrylate, and dehydrating agent are rapidly dispersed in a specific ratio to obtain a UV-cured waterproof varnish; this varnish is then coated onto paper printed materials with an ink layer, leveled, and subjected to UV primary curing, followed by standing at a suitable temperature and humidity for 24-48 hours to obtain a high-adhesion waterproof paper printed material. This invention promotes further cross-linking of the silane groups in the system, resulting in an extremely strong bond between the varnish layer and the paper printed material with an ink layer, thus achieving excellent high adhesion.

The application belongs to the technical field of eye medication, and specifically designs a metal riboflavin nanomaterial and a trans-epithelial corneal cross-linking preparation. The metal riboflavin (nRfpM) nanomaterial is obtained by coordinating modification of metal ions on the -HPO4- group of riboflavin sodium phosphate. n+ The lipophilicity of the nRfpM nanomaterial is greatly improved due to the coordination of the -HPO4- group for improving the hydrophilicity of the Rfp molecule, and the trans-epithelial delivery capacity of the product nRfpM nanomaterial is further improved, so that the trans-epithelial corneal cross-linking effect of the obtained product is greatly improved and can be comparable to the clinical de-epithelial corneal cross-linking effect, thereby providing a new type of reagent for trans-epithelial corneal cross-linking and having important clinical application prospects.

This invention discloses a starch-based particleboard adhesive that cures rapidly at medium and low temperatures and its preparation method, belonging to the field of adhesive preparation technology. The starch-based particleboard adhesive of this invention comprises component A and component B; component A includes: 150 parts starch, 200-300 parts water, 20-25 parts concentrated hydrochloric acid, 12-18 parts dilute nitric acid, 25-40 parts sodium hydroxide solution, 6-9 parts initiator, 27-35 parts grafted monomer, and 2-5 parts emulsifier; component B includes: 8-11 parts ethylenediamine, a post-crosslinking agent. This starch-based particleboard adhesive effectively solves the problems of high curing temperature and long curing time in existing starch adhesives. While maintaining a relatively fast curing speed, it can reduce the curing temperature to 105℃, reducing the energy consumption in particleboard production. It can be widely used in the hot-press bonding of particleboard, plywood, fiberboard, and wood blocks.

This invention relates to a rapid film-forming repair composition, its preparation method, and its application. The rapid film-forming repair composition comprises: a rapid film-forming repair component, a film softener, a pH adjuster, a preservative, and water. The film-forming repair component includes: Suizenji nori polysaccharide, galactoarabinogalactan, and sodium dextran sulfate. The three components, Suizenji nori polysaccharide, galactoarabinogalactan, and sodium dextran sulfate, interact synergistically to promote skin improvement. Specifically, they can accelerate the formation of a film after application of the active ingredients, effectively conditioning and repairing the skin. Furthermore, they can alleviate skin inflammation and redness, and promote tissue regeneration. The rapid film-forming repair composition provided by this invention is highly suitable for use in skincare products, being gentle, non-irritating, and stable.

This invention discloses an enhanced antistatic polyetheretherketone (PEEK) composite material and its preparation method. The composite material is prepared from the following raw materials in parts by weight: 60-85 parts of PEEK resin, 5-15 parts of a first synergistic component, 3-10 parts of a second synergistic component, 2-8 parts of a third synergistic component, and 1-5 parts of a high-temperature processing aid. The first synergistic component is a mixture of a metal-based conductive filler and a high-temperature resistant antistatic synergist; the second synergistic component is ionic liquid-functionalized modified graphene; the third synergistic component is a composite of carbon nanotubes and conductive nanofibers; and the high-temperature processing aid includes a high-temperature lubricant and a high-temperature antioxidant. The preparation method includes steps such as preparing various premixes, melt blending, extrusion granulation, and supercritical fluid in-mold foaming. This invention constructs a stable three-dimensional conductive network through the synergistic effect of multi-scale conductive fillers, giving the composite material excellent antistatic properties.

The application discloses a double-sided hydrogel scaffold for urethral repair and a preparation process thereof, and belongs to the technical field of biomaterials. The PCH@PVA scaffold is constructed, a base layer on the tissue side creates a eutrophication and guiding microenvironment for regeneration by using heparin, and a functional layer on the lumen side effectively blocks the penetration of harmful components in urine and the colonization of bacteria by a polyvinyl alcohol coating, and by optimizing the crosslinking degree of PVA, the PVA has excellent mechanical toughness and elasticity, can not only withstand the periodic expansion of the urethra without breaking, but also can transmit mechanical stimulation close to the physiological range, guide cells to functional regeneration instead of pathological fibrosis. The PCH@PVA scaffold provided by the application has excellent effects in promoting re-epithelialization, angiogenesis, inhibiting fibrosis and preventing stenosis. The application also provides a new design paradigm and theoretical basis for tissue regeneration strategies in other complex physiological microenvironments.

This invention provides a highly efficient and stable method for cross-linking fat-soluble vitamins and carotenoids into microcapsules. Rapid cross-linking of the microcapsules can be achieved through low temperature and high humidity, resulting in water-repellent fat-soluble vitamin microcapsules. This method offers advantages such as rapid cross-linking, uniform and saturated cross-linked particles, low vitamin activity loss, long product shelf life, and high bioavailability.

The application relates to a kind of shield foam wall post-grouting material using siltstone slag and a preparation method, and belongs to the technical field of shield tunnel construction.The shield foam wall post-grouting material using siltstone slag comprises slurry and water glass, and the slurry comprises cement 5-10% by mass fraction, fly ash 13-18%, sodium dihydrogen phosphate 0.1-0.6%, bentonite 4-8%, bubble liquid 0.5-2%, pretreated siltstone 34-39%, xanthan gum 1-5%, and the rest is water, and the volume ratio of the slurry to water glass is 1:0.1-0.14.The application replaces river sand with siltstone, solves the problem of difficult disposal of waste slag, is an economic and environmentally-friendly method for recycling waste soil, and has good environmental benefits.