189 results about "Chemical modification" patented technology

The application discloses a low-viscosity nitrogen-modified flame-retardant and smoke-suppressing silicone oil and a preparation method thereof, relates to the technical field of modified silicone oil, and the flame-retardant and smoke-suppressing silicone oil is obtained by ring-opening addition reaction of double-end epoxy silicone oil and methyl urea. The nitrogen-containing group is introduced into the polysiloxane molecule in a reactive form by adopting the chemical modification of methyl urea on the end epoxy silicone oil, so that the flame-retardant and smoke-suppressing performance and the thermal stability of the silicone oil are improved without significantly sacrificing the material fluidity. The obtained low-viscosity nitrogen-modified flame-retardant and smoke-suppressing silicone oil still maintains a good flow state at normal temperature, and is convenient to use in the modification of high polymer materials, the blending of composite systems and subsequent processing applications.

The application provides a silk fabric fiber crimping forming method, and belongs to the technical field of crimped silk fabric manufacturing, which comprises a silk bundle smoothing step, a single-side modification step, an axial dispersion step, a fiber feeding step, a pulse compression step and a setting fixing step. The silk fabric fiber crimping forming method combines differential flexure of a mechanical structure with internal stress generated by chemical modification, and solves the problems of traditional physical crimping methods, such as non-durability of crimping degree and poor fluffy feeling.

The present application relates to a kind of water-based paint for leather surface waterproof, belong to coating technical field.The water-based paint is made of the following components: 80 parts polyether sulfone modified polyurethane-acrylate composite resin dispersion, 5 parts crosslinking agent polycarbodiimide, 10 parts anti-adhesive polydimethylsiloxane, 10 parts cosolvent dipropylene glycol methyl ether, 10 parts nano reinforcing material, 1.5 parts amino-terminated hyperbranched polyamide.Core resin dispersion is prepared by grafting onto polyurethane-acrylate skeleton through sulfonated polyether sulfone chemistry.The present application is prepared by unique resin chemical modification and nanocomposite technology, so that the obtained coating has excellent waterproofness, high adhesion, good mechanical strength and anti-aging property, especially suitable for high requirements such as automotive interior, furniture and other leather surface treatment, while meeting environmental protection requirements.

The application belongs to the technical field of starch chemical modification, and particularly relates to a preparation method of acetylated distarch phosphate. The method comprises the following steps: mixing starch with a deep eutectic solvent composed of choline chloride, glycerol and a small amount of water, adding a phosphate crosslinking agent and a delayed-release alkalizing agent for crosslinking reaction after pH adjustment, performing acetylation reaction by adding acetic anhydride or vinyl acetate after cleaning by alcohol solvent replacement, and finally obtaining the product through neutralization, washing, dehydration and drying. The process utilizes the deep eutectic solvent to control water activity and particle structure, and combines the slow-release alkali source to maintain a stable reaction environment, so that the crosslinking and acetylation are uniformly carried out, and the side reactions and residual salt load are effectively reduced. The obtained acetylated distarch phosphate has stable substitution degree, uniform particle structure and excellent performance in freeze-thaw stability, and is suitable for multiple fields such as papermaking, textile and oil field additives.

The present application relates to the technical field of antibody conjugated drugs, in particular to a drug conjugate with sustained-release property, an antibody conjugated drug and application thereof. The drug conjugate Payload is a payload selected from a drug molecule with cytotoxicity; X is a heteroatom in the payload, selected from O or N; R4 and R5 are independently selected from hydrogen, an alkyl group or other chemical modification groups; R1, R2, R3 and R6 are independently selected from hydrogen, an amino group, a group containing an ether bond, a hydrophilic group, a halogen, an alkyl group or other chemical modification groups; and Glu is a glucuronic acid group. The present application has the advantages of achieving sustained-release effect, increasing stability, avoiding possible non-specific rupture of carbamate bonds in in-vivo circulation, improving the half-life of ADC drugs in blood circulation, reducing toxicity and increasing drug efficacy, and achieving more effective and safe treatment effect due to the sustained-release mechanism which maintains local toxin concentration in a more reasonable killing interval and reduces systemic toxic side effects.

This invention belongs to the field of ceramic materials technology, specifically relating to photocurable silicon nitride ceramic slurry, silicon nitride ceramics, and their preparation methods. The invention involves sequentially subjecting silicon nitride powder to surface oxidation modification and sintering aid coating modification to obtain a silicon nitride composite powder with a silicon nitride core, a silicon dioxide intermediate layer, and a sintering aid outer shell. This composite powder is then uniformly mixed with a photocurable resin, a photoinitiator, and a dispersant to prepare a photocurable silicon nitride ceramic slurry. The slurry is then photocured and 3D printed to obtain a silicon nitride ceramic green body, which is subsequently subjected to thermal debinding and pressure sintering to obtain the photocurable silicon nitride ceramic. This invention, through two-step chemical modification, simultaneously optimizes the optical properties and sintering activity of silicon nitride powder, thereby improving the light transmittance of the silicon nitride ceramic slurry and enhancing the mechanical properties of the silicon nitride ceramic.

The application belongs to the technical field of daily chemicals, and particularly relates to a high-temperature and mild alkyl glucoside sulfonate as well as a preparation method and application thereof. The alkyl glucoside sulfonate provided by the application is obtained by using the hydroxyl activity on the glucose unit of glucoside to perform chemical modification, and specifically, the alkyl glucoside is first subjected to intramolecular cross-linking by using 1,3-dichloro-2-propanol, and then subjected to anionization modification by using 3-chloro-2-hydroxypropanesulfonate sodium. The alkyl glucoside sulfonate prepared by the application has the advantages of mildness, low irritation, strong hard water resistance, good foaming performance, low skin penetration and small residual amount, can effectively solve the defects of strong penetration, strong deproteinization and delipidation, great damage to skin barrier and weak thickening effect of alkyl glucoside in personal cleaning products, and is very suitable for being widely used and popularized in daily chemicals.

The present invention provides: an artificial nail treatment method capable of reducing irritation during removal; and a treatment method that easily and cleanly removes an artificial nail with minimal irritation and without causing pain to the recipient of the treatment. Provided are: an artificial nail treatment method for performing a treatment for forming an artificial nail via a primer layer, the artificial nail treatment method being characterized by including a step for forming a primer layer by applying an aqueous dispersion, which contains fine cellulose fibers, to the surface of a nail; and an artificial nail removal treatment method characterized by including a step in which the artificial nail, which is a gel nail covering a nail surface with the primer layer therebetween, is removed through an underwater vibration treatment or a steam treatment. The fine cellulose fibers are preferably chemically modified.

The disclosure provides a composite semi-solid electrolyte membrane with carbon-carbon double bond structure and a preparation method, the composite semi-solid electrolyte membrane comprises: a modified polymer matrix, which is obtained by treating polyvinylidene fluoride or its copolymer with a metal hydroxide solution, the treatment forms a carbon-carbon double bond structure on the polymer backbone, and in-situ generates and uniformly disperses inorganic fluoride particles in the modified polymer matrix; reinforcing fibers, which are dispersed in the modified polymer matrix and interweave to form a three-dimensional network skeleton; and additives, which are dispersed in the modified polymer matrix and used to provide lithium ion carriers for the lithium ion battery. The disclosure realizes the synergistic improvement of the ion conductivity, mechanical strength and thermal stability of the composite semi-solid electrolyte membrane by generating carbon-carbon double bond structure and inorganic fluoride through chemical modification and combining with the fiber reinforcement technology, and exhibits good application prospect in the semi-solid lithium ion battery.

The application discloses a preparation method of electrochemically modified sweet potato residue pectin, and products and applications of the electrochemically modified sweet potato residue pectin. The sweet potato residue pectin is modified by using an electrochemical method, and the process is simple, green and efficient, and an anode modified pectin with high antibacterial activity and a cathode modified pectin with excellent wide-pH gel performance can be simultaneously prepared. Application researches show that the cathode modified pectin is combined with cinnamaldehyde to form stable milk gels, and the evaporation of water and the volatility of cinnamaldehyde can effectively delay strawberry spoilage; the anode modified pectin coating can significantly prolong the shelf life of refrigerated beef by 2 days, inhibit the growth of microorganisms and maintain the meat color and quality. The application provides a new idea for green modification of the sweet potato residue pectin and expands the application potential of the sweet potato residue pectin in food preservation and functional materials.

The present specification discloses a starch mixture useful for making baking creams. The starch mixture comprises a cold water-swellable, heat-set waxy starch and a cold water-swellable, heat-set non-waxy starch. The starches can be co-processed or prepared separately and mixed. The disclosed mixture can be used to replace alginate and chemically modified food starches in baking creams. Baking creams prepared using the disclosed starch blends have comparable firmness, as well as functional and sensory texture, to baking creams containing alginate.

This invention provides a low-carbon concrete made from modified lithium slag powder and its preparation method, belonging to the field of green low-carbon concrete technology. The concrete comprises the following raw materials: 180-200 parts cement, 40-60 parts fly ash, 20-30 parts granulated blast furnace slag powder, 40-60 parts modified lithium slag powder, 2-4 parts hydroxyapatite powder, 860-880 parts manufactured sand, 1030-1060 parts crushed stone, 0.05-0.2 parts β-cyclodextrin, 6-8 parts polycarboxylate superplasticizer, and 150-160 parts water. This invention utilizes waste slurry from mixing plants and leaching wastewater from corn deep processing to modify lithium slag powder through mechanical-chemical modification and in-situ organic-inorganic hybrid coating. Simultaneously, combined with multi-component synergistic optimization of the concrete formulation system, it significantly improves the overall performance of the concrete, solving problems such as poor workability, large slump loss over time, weak interface, and unstable later-stage strength development in lithium slag concrete.

The application discloses a kind of anticorrosion weather-resistant double-coat powder coating for new energy storage cabinet and preparation method thereof, belong to powder coating processing technical field, for solving the technical problem that powder coating for new energy storage cabinet corrosion resistance in prior art is further improved in outdoor weather resistance and strong medium corrosion resistance.A kind of anticorrosion weather-resistant double-coat powder coating for new energy storage cabinet, including primer and surface coating, the primer includes the following composition by weight parts: epoxy polyester 70-80 parts, anticorrosive filler 28-32 parts, curing agent 3-5 parts and auxiliary additive 2-3 parts.The application is designed by resin molecular structure and inorganic filler surface chemical modification synergistic construction high density, high weather-resistant double-coat system, so that coating still maintains excellent adhesion, impact resistance and long-term corrosion resistance under ultraviolet, impact and strong acid and alkali environment.

INDUSTRIAL PROCESS FOR THE TOTAL DESTRUCTION OF POLLUTANTS IN GAS OR LIQUID COMPOUNDS BY CHEMICAL MODIFICATION. The invention relates to a process for the chemical modification of pollutants in a gaseous or liquid composition followed by their total destruction by an advanced oxidation process (AOP), for the treatment of any pollutant, alone or in a multi-pollutant mixture, selected from: - Alkali-sensitive inorganic compounds or those simply soluble in aqueous media. - Alkali-sensitive organic compounds or those simply soluble in aqueous media. A process for the chemical modification and total destruction of alkali-reactive pollutants, partially or totally water-soluble, present in a gaseous or liquid effluent has now been developed.

Disclosed is a polyamine-modified gelatin-based hydrogel and use thereof, belonging to the technical field of pharmaceutical preparations. A polyamine-modified gelatin is prepared by polyamine chemical modification and then cross-linked with a polyaldehyde-polyethylene glycol (CHO-PEG) derivative to form a hydrogel. The polyamine groups on the modified gelatin construct a hydrophobic core region.

This invention provides an antibacterial cotton fiber based on silver-doped carbon quantum dots (Ag-CQDs), its preparation method, and its applications, belonging to the field of functional textile materials technology. This invention employs a microwave method for the rapid synthesis of silver-doped carbon quantum dots (Ag-CQDs). Utilizing the instantaneous high temperature, uniform heating, and electron transfer-promoting properties of microwaves, silver ions rapidly combine with the oxygen- and nitrogen-containing functional groups of the carbon precursor, forming a covalent / coordination composite structure of silver-doped carbon quantum dots. Further chemical modification of the cotton fiber generates numerous active reaction sites on its surface. Finally, Ag-CQDs are firmly loaded onto the cotton fiber surface and surface voids through covalent bonds, coordination bonds, and hydrogen bonds, forming a uniform, continuous, strong, and washable antibacterial coating. The resulting silver-doped carbon quantum dot-based cotton fiber exhibits long-lasting antibacterial properties, along with low toxicity, high stability, and good bonding strength, demonstrating excellent application prospects in the field of long-lasting antibacterial textile materials.

The application discloses a method for preparing energy storage type lignin micro / nano spheres with controllable morphology, and mainly relates to preparation of lignin spherical micro / nano spheres in a solid acid solvent-water system. By controlling reaction conditions such as solid acid concentration, reaction temperature and reaction time, the purpose of controllable morphology and size can be achieved, and the prepared lignin micro / nano spheres have excellent electrochemical performance and good energy storage performance. The method can realize efficient separation of lignin from wood fiber raw materials at low temperature and normal pressure, and can directly prepare microspheres in the lignin recovery process. Compared with conventional methods, the preparation method is simple, the yield is high, and large-scale preparation of lignin microspheres with controllable size can be realized. The chemical modification of lignin and the use of high-toxicity chemical reagents are avoided, cost is saved, environmental pollution is reduced, and the method has good practicability.

This invention belongs to the field of composite board technology, specifically relating to a method for preparing outdoor wood-plastic composite boards using household waste as raw material. The method for preparing outdoor wood-plastic composite boards using household waste as raw material is characterized by the following steps: S1, pretreatment: crushing, sorting, separating, grinding, and drying the household waste to obtain pretreated granules; S2, mixing the pretreated granules with a coupling agent and additives sequentially and evenly to obtain a mixture; S3, extruding, shaping, drawing, and cutting the mixture to obtain the outdoor wood-plastic composite board; wherein the coupling agent is polymethylene polyphenyl polyisocyanate, γ-aminopropyltriethoxysilane, and maleic anhydride. This invention uses household waste as raw material and employs a composite coupling agent system for chemical modification to eliminate the adverse effects of impurities such as aluminum foil and protein that are difficult to separate, thus improving product quality; the resulting outdoor eco-friendly wood-plastic composite board exhibits superior mechanical properties compared to products produced using traditional processes.

This invention belongs to the field of biomedical technology and discloses a method for preparing oil-soluble nonapeptide-1 and its application. This method covalently links a C8–C18 hydrophobic alkyl chain to the Arg guanidine group at the 4th position and / or the Lysε-amino group at the 7th position of nonapeptide-1, obtaining a molecularly oil-soluble derivative that retains tyrosinase inhibitory activity. This invention achieves a transformation from physical solubilization to chemical modification by introducing structurally optimized hydrophobic groups at specific sites in the nonapeptide-1 molecule. The resulting oil-soluble nonapeptide-1 exhibits molecular-level dispersion in oils and is thermodynamically stable, requiring no external carrier or high proportion of excipients, effectively solving the problems of precipitation, inactivation, and deterioration of skin feel caused by interfacial tension in existing technologies. Simultaneously, its tyrosinase inhibitory activity is highly preserved, and it possesses excellent transdermal properties. This technical solution lays a solid foundation for the efficient, stable, and safe application of nonapeptide-1 in high-end oil-based skincare products, demonstrating significant technological advancement and industrialization value.

[Problem] This invention provides a mixture of PLA and CNC that retains the biodegradability inherent in PLA while improving its general-purpose properties without increasing environmental impact. [Solution] The PLA and CNC mixture of this invention is as follows: CNC with a crystallinity of 90% or higher and no chemical modification, consisting only of biodegradable substances, is added to PLA. The CNC dispersed in PLA becomes crystal nuclei, forming numerous crystals, thus forming ligands that span multiple crystals, creating a PLA crystal network structure. This structure improves the physical properties of PLA. The improvement is not achieved by cross-linking or polymerizing PLA into environmentally burdensome substances or other chemical substances, nor by adding environmentally burdensome chemicals. Instead, it is achieved by modifying the crystallinity and crystal structure of PLA by adding biodegradable, non-toxic, and environmentally unburdensome CNC. Therefore, this mixture of PLA and CNC improves the physical properties while maintaining the biodegradability inherent in PLA.

The application provides a silane coupling agent modified PTFE and modified fluorine rubber, the silane coupling agent surface modification of PTFE is used for FKM, and FKM / PTFE composite materials are prepared, so that the limitation of fluorine rubber in the aspect of mechanical properties is improved.The application explores the grafting behavior of the silane coupling agent on the surface of PTFE, the modification process has the advantages of environmental protection and low cost, the tensile strength and temperature resistance of the PTFE / FKM composite material can be significantly improved, the production cost is reduced, and the environmental pollution caused by the traditional chemical modification process is reduced.The application explores a new interface modification mechanism of synergistic enhancement of multifunctional groups through ultraviolet irradiation, realizes the grafting of the coupling agent on PTFE, is used for the modification of FKM, improves the performance, and can realize the application of fluorine rubber composite materials in new energy industry, aerospace and other sealing occasions, and has certain application value.

The application discloses an antibacterial silk fibroin gel dressing and a preparation method thereof, and belongs to the technical field of medical dressings. In order to solve the technical problems that the antibacterial components in the existing antibacterial silk fibroin gel dressing are prone to burst release, leading to initial cytotoxicity and mid-late invalidation, the covalent grafting density is low and the spatial accessibility is poor, and the chemical modification may interfere with the gel-forming performance of the gel, an in-situ functionalization strategy of chemical bonding is adopted, antibacterial active groups are directly introduced into silk fibroin macromolecular side chains through a covalent bond, and then the gel is formed by taking the groups as units, so that each silk fibroin molecular chain constituting the gel network itself becomes a carrier unit of the bactericidal function. The prepared antibacterial silk fibroin gel dressing is not only mild and controllable in the preparation process, and does not need to introduce toxic cross-linking agents or organic solvents, but also is stable and durable in antibacterial activity, high in biological safety, and can provide a novel functional dressing with practicability and advancement for clinical wound infection prevention and treatment.

This invention discloses a neutron shielding material with a biomimetic chlorophyll structure and its preparation method, belonging to the field of artificial fiber technology. The method includes: S1, surface hydrophobic modification of boron-containing compounds and transition metal carbon / nitrides using a bifunctional silane coupling agent; S2, preparation of a core layer suspension containing modified powder and a shell layer solution containing a hydrophobic polymer; S3, construction of a wet precursor fiber membrane with a core-shell structure using coaxial electrospinning; S4, induction of solvent directional crystallization through directional temperature gradient field cryogenic treatment, followed by sublimation drying to form a biomimetic layered porous structure inside the core layer; S5, heat treatment to solidify the biomimetic layered structure. This invention solves the interfacial compatibility problem between inorganic fillers and organic matrices through the synergistic effect of interfacial chemical modification and biomimetic structural regulation, achieving spatially ordered arrangement of functional components. The resulting material possesses excellent lightweight properties, structural stability, and neutron shielding effectiveness.

This invention relates to the field of lithium-ion battery technology and discloses a surface-modified graphite anode material and its preparation process. The process includes pretreatment, primary coating and heat treatment, wet chemical modification, secondary heat treatment, and washing and drying. By adding nano-silica powder and performing heat treatment in the primary coating and heat treatment step, a uniform preliminary modification layer is formed in situ on the surface of graphite particles. This layer structure helps to form a more stable solid electrolyte interface film in subsequent electrochemical cycles, thereby improving the first coulombic efficiency and cycle stability of the anode material. By introducing lithium salt solution and silane coupling agent to synergistically treat the primary modified graphite, the lithium salt provides an active lithium source to compensate for the irreversible capacity loss in the first cycle, while the silane coupling agent can enhance the chemical bonding between the graphite surface and the coating layer. The two synergistically improve the specific capacity and interface structure stability of the material.