17 results about "Self-condensation" patented technology

This invention relates to the field of polymer compound technology and discloses a low-viscosity hydroxyl-terminated silicone oil and its applications. The silicone oil is prepared by reacting a base cyclosiloxane, a bulky sterically hindered cyclosiloxane, and a hydroxyl-terminating agent. The bulky sterically hindered cyclosiloxane forms a random copolymer structure with the base cyclosiloxane, and the number of basic segments between adjacent sterically hindered segments is greater than or equal to four. The steric hindrance effect generated by the bulky side chain groups blocks the intermolecular condensation pathway of the terminal silanol groups, eliminating the self-condensation phenomenon of the low-viscosity hydroxyl-terminated silicone oil during room temperature storage, achieving zero viscosity growth and complete retention of the terminal hydroxyl groups during storage, thus maintaining low-viscosity fluid characteristics.

The invention belongs to the technical field of agricultural biology, and particularly relates to a saline-alkali soil seed germination and growth promoter based on 3-hydroxydecanoic acid as well as a preparation method and application thereof. The accelerant consists of the following components in percentage by weight: 2-10% of a mixture of 3-hydroxydecanoic acid and 3-hydroxydecanoic acid dipolyester, 1-5% of hydroxypropyl-beta-cyclodextrin, 1-5% of mineral source potassium fulvate, 0.1-1% of polyether, and the balance of water, wherein the pH is regulated to 6.5 + / -0.1 by potassium hydroxide. The 3-hydroxydecanoic acid dipolyester is prepared by carrying out self-condensation esterification on 3-hydroxydecanoic acid in the presence of a strong acid catalyst. The accelerant is prepared by sequentially dissolving all the components and adjusting the pH value, and can be applied to seed dressing and coating or drip irrigation and dilution during use. Experimental results show that the accelerator can significantly improve the seed germination rate, the seedling root length, the fresh weight and the chlorophyll content of wheat, corn, cotton and rape in saline-alkali soil with the salt content of 0.2-1.0%, so that the early growth performance of crops in a saline-alkali environment is effectively enhanced.

The invention relates to the technical field of textile after-finishing, and discloses a production process of anti-static work clothes, which comprises the following steps: activating the surface of a base material fabric; padding the fabric by using a controlled release type functional finishing liquid prepared from a core functional monomer, boric acid as a dynamic protective agent and the like; and carrying out multi-stage temperature control baking on the padded fabric. According to the invention, the dynamic protective agent can temporarily close the active group of the core functional monomer and inhibit the self-condensation of the core functional monomer in the finishing liquid, so that the working life of the working liquid is prolonged; in the high-temperature baking stage, the protected active groups are dissociated and released, covalent bonding is carried out on the surfaces of the activated fibers, and a cross-linked network is formed on the surfaces of the fibers. The chemical bonding anti-static functional layer is constructed on the surface of the fiber, so that the work clothes have excellent washing resistance and stable product quality, and meanwhile, the finishing process is high in stability and suitable for industrial production.

The invention discloses a synthesis method of fructosazine, and belongs to the field of chemical synthesis. According to the method, 1-amino-1 deoxy-D-fructose is used as a raw material, intermolecular self-condensation reaction is completed under the catalysis of organic alkali, fructosazine is obtained, post-treatment is simple and convenient, and other impurities are not introduced; the obtained product is pure in color and high in purity, and a new synthesis path is provided for synthesis of fructosazine.

The invention relates to a flame-retardant antibacterial fabric and a preparation process thereof, and belongs to the technical field of functional textile finishing, the flame-retardant antibacterial fabric comprises a base cloth and a multifunctional finishing layer fixed on the fiber surface of the base cloth through chemical bonding; the multifunctional finishing layer is formed by hydrolytic condensation of a reaction type finishing agent containing phosphorus-nitrogen-silicon, the reaction type finishing agent is hyperbranched molecules with cyanuric chloride as a core framework, siloxane anchoring groups are introduced in the scheme, the finishing agent can be subjected to a dehydration condensation reaction with hydroxyl groups on the fiber surface of the base cloth, and therefore the fiber surface of the base cloth can be effectively protected; a firm covalent bond is formed, and meanwhile, a net-shaped structure is constructed through self-condensation reaction among silanol groups; the mechanism of combining chemical bonding and physical coating solves the problem that the auxiliary agent is easy to fall off in the prior art.

A polymer-coated graphite negative electrode material, and a preparation method therefor and a use thereof. The preparation method comprises: polymerizing a mixed reaction system at least comprising an acrylate monomer, an initiator and a first solvent to prepare an acrylate polymer; mixing the acrylate polymer, a graphite material and a second solvent for reaction, removing the solvent, and then performing a low-temperature thermal crosslinking reaction to prepare a polymer-coated graphite negative electrode material, wherein the low-temperature thermal crosslinking reaction at least removes pendant groups of the acrylate polymer and causes self-condensation. The prepared polymer-coated graphite negative electrode material has excellent thermal stability, and batteries prepared from the polymer-coated graphite negative electrode material can work at high temperatures and also have an excellent capacity retention rate.

The application provides a self-condensation type silicone emulsion, which is prepared from raw materials comprising the following components: 250-400 parts by weight of linear polydimethylsiloxane; 50-100 parts by weight of a silicone resin; 50-100 parts by weight of a functional additive; 30-70 parts by weight of a surfactant; and 330-620 parts by weight of water; the unit chain of the silicone resin is: [R'3SiO 0.5 ] M [R"SiO 1.5 ] T [SiO2] Q ; wherein R' and R" are independently selected from a phenyl group, a methyl group, an ethyl group, an aminoethyl group or an aminopropyl group, (R'+R") / Si is 1.1-1.5, and the hydroxyl content is 0.5%-4%. Compared with the prior art, the self-condensation type silicone emulsion provided by the application realizes better interaction by using components with specific contents, and has the following advantages: no catalyst is needed, is safe and environmentally friendly, has adjustable performance, is simple to use and has wide application, and can be applied in the fields of cosmetics, concrete waterproofing, coating hand feeling modification, fabric waterproofing and the like.

The invention relates to a high-thermal-conductivity and low-dielectric composite material capable of being dynamically repaired and a preparation method and application thereof, and belongs to the technical field of electronic advanced packaging and high-frequency substrate thermal management materials. According to the invention, a traditional hydroxyl-containing binder is abandoned, and a boron-oxygen-six-ring-crosslinked 3D boron nitride bidirectional orientation skeleton is constructed in situ by using a self-condensation reaction of a boric acid precursor under bidirectional freeze concentration; meanwhile, novel polysiloxane with a discotic liquid crystal side chain and a dynamic borate network is synthesized; a vacuum-pressure alternating auxiliary impregnation process is utilized to induce the disc-shaped liquid crystal to be assembled on the surface of a framework in an epitaxial manner, and in-situ addition curing without byproducts is carried out. According to the invention, the industrial pain points that the traditional packaging material cannot give consideration to Z-axis high thermal conductivity, high-frequency ultralow dielectric loss and unreworkable property after curing are overcome, and the packaging material is especially suitable for the fields of 5G / 6G high-frequency communication and 2.5 D / 3D Chiplet advanced system-level packaging.

This invention discloses a method for preparing high-purity nano-magnesium aluminum spinel by hydrolysis of composite alkoxides, belonging to the field of inorganic non-metallic nanopowder material preparation. The method employs a stepwise strategy to synthesize the magnesium-aluminum bimetallic alkoxide precursor: first, elemental aluminum reacts with an alcohol to generate aluminum alkoxide, then elemental magnesium is added for ligand exchange, ensuring atomically uniform mixing of magnesium and aluminum from the source; after hydrolysis, a silane coupling agent containing long-chain alkyl groups is added to the sol for in-situ chemical grafting modification; finally, the product is obtained by drying and calcining at 600–900℃. This invention organically integrates the atomically uniform synthesis of the precursor with the sequential separation of the hydrolysis-modification steps, avoiding competition between the coupling agent grafting reaction and its self-condensation reaction, forming a chain-like synergistic effect of uniform precursor → uniform grafting → internal combustion → low-temperature phase formation → low agglomeration. The prepared powder has a purity ≥99.999%, an average particle size of 50–150 nm, a narrow particle size distribution, and excellent dispersibility.

The present invention relates to a process for at least partially removing aldehydes from a composition, the process comprising the following steps: a) A step of bringing the composition into contact with at least one cation exchanger and / or acid at a temperature of 20.0°C to 250.0°C, b) Separating the aldehyde at least partially from the composition, and optionally performing a treatment on the separated aldehyde selected from condensation, absorption, adsorption, chemical bonding, chemical reaction, oxidation, and thermal decomposition, Includes, This results in a composition having a reduced aldehyde content. In that case, the composition to be treated in step a) contains at least one alkylene oxide unit and at least one compound having a molecular weight of 200 g / mol or more in its chemical structure, and The composition contains 3.5 wt% or less of an alcohol having 1 to 6 carbon atoms, based on the total weight of the composition. The present invention also relates to a composition containing at least one alkylene oxide unit and at least one compound having a molecular weight of 200 g / mol or more in its chemical structure, wherein the total aldehyde content is 1000 ppm or less.

This invention relates to the fields of inorganic chemical engineering and textile auxiliaries, and discloses a surface modification process for textile-grade sodium metaantimonate to improve dispersibility. The process includes: adding sodium aluminate to a sodium metaantimonate suspension and stirring until dissolved to create an alkaline liquid environment in which tetrahydroxyaluminate ions are stably present; adding an aqueous solution of phenylphosphonic acid dropwise to this alkaline system for acid-base neutralization, controlling the hydrolysis of aluminum species using the acid release rate, and inducing in-situ generated aluminum hydroxyl species to coordinate with phenylphosphonate ions. This invention constructs an antimony-oxygen-aluminum-oxygen-phosphorus chemical hybrid coating layer without a phase interface on the surface of sodium metaantimonate through a specific acid-base coupling synchronous mineralization mechanism. This kinetically blocks the self-condensation aging path of aluminum species, improves the interfacial bonding force and thermal stability of the modified layer under high temperature and high shear conditions, and effectively solves the problems of thermal desorption and secondary agglomeration of sodium metaantimonate during melt spinning.

The invention belongs to the field of organic silicon release agents, and discloses a bridging active MQ silicon resin modified silicone oil stripping force regulator as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, carrying out self-condensation and co-condensation on conventional low-molecular-weight vinyl MQ silicon resin in a trace amount of strong base and a solvent medium to respectively obtain a medium-molecular-weight silicon vinyl bridged MQ silicon resin solution, then adding double-end active silicone oil which is 0.9-1.1 times of the mole number of vinyl of the MQ silicon resin, and carrying out platinum catalysis, so as to obtain the high-molecular-weight silicon vinyl bridged MQ silicon resin. And finally, removing the solvent to obtain the bridging active MQ silicon resin modified silicone oil. When the modified silicone oil or the composite modified active silicone oil doped with the ethylene glycol diallyl ether bridged silicon-hydrogen-terminated polydimethylsiloxane is used in an addition type vinyl silicone oil release agent, the stripping force of a release coating can be adjusted and increased, and the stripping force before and after aging is relatively stable; the method has a wide application prospect in a wide range from medium stripping to heavy stripping.

The invention belongs to the technical field of fine chemical engineering, and provides a cross-linked color fixing agent, a preparation method and application thereof, and a color fixing method. The preparation method comprises the following steps: carrying out dehydration treatment on hyperbranched polyethyleneimine, and carrying out nucleophilic substitution reaction on the dehydrated hyperbranched polyethyleneimine and N-hydroxymethyl chloroacetamide to obtain N-hydroxymethylated hyperbranched polyethyleneimine; and dissolving the N-hydroxymethylated hyperbranched polyethyleneimine in water, and adjusting the pH value of the system to 5-7 to obtain the cross-linked color fixing agent. According to the preparation method, primary amino on a hyperbranched polyethyleneimine molecular chain is used as a nucleophilic reagent and is subjected to nucleophilic substitution reaction with a carbon-chlorine bond in N-hydroxymethyl chloroacetamide, and nitrogen hydroxymethyl is introduced into the hyperbranched polyethyleneimine molecular chain; nitrogen hydroxymethyl forms a cross-linked network in two modes of self-condensation and etherification reaction with active hydrogen; then, residual amido on a hyperbranched polyethyleneimine molecular chain is converted into ammonium salt through neutralization, so that the electrostatic interaction between the hyperbranched polyethyleneimine molecular chain and anionic dye is improved, and finally, the color fixing effect is improved.

The present application belongs to the technical field of paint, and particularly relates to a water-based two-component polyurethane paint, a preparation method and application thereof. The water-based two-component polyurethane paint comprises component A and component B; the component A comprises resin, pigment and filler, additive, cosolvent, and water; the component B comprises modified polyurethane curing agent; the modified polyurethane curing agent comprises -NCO groups and alkoxysilane functional groups. The -NCO groups in the modified polyurethane curing agent react with the resin, and the hydrolysable and condensable alkoxysilane functional groups introduced at the molecular terminal or side chain can form a firm Si-O-M covalent bond with the surface of inorganic / metal substrate during the curing process of the coating film, so as to improve the adhesion; the self-condensation of the alkoxysilane functional groups can form a dense Si-O-Si hydrophobic network, so as to significantly improve the water resistance; meanwhile, the Si-O-M covalent bond and the Si-O-Si hydrophobic network can interpenetrate with the polyurethane network, so as to improve the crosslinking density and medium resistance of the coating.

This invention relates to a method for producing nanosilica using organic silicon waste catalysts, and aims to reduce the environmental burden caused by landfill volume and hazardous waste. [Solution] After appropriate pretreatment of the organosilicon waste catalyst, it is acid-leached and purified with HCl, and then the residue is directly reacted with NaOH to obtain Na2SiO3. In the manufacturing process, Na2SiO3 is used as the silicon source and NH4Cl as the precipitant, and the catalytic hydroxyl group self-condensation reaction of Na2SiO3 is carried out in a polyol / low molecular weight alcohol / polyquaternium / aqueous solvent system. The effect of the ratio of polyol, ethanol, and polyquaternium on the particle size, dispersibility, and shape of amorphous SiO2 nanoparticles was investigated. Finally, spherical amorphous SiO2 nanoparticles with excellent dispersibility were produced from silicon-containing solid waste. These nanoparticles have high yield and purity, a particle size controlled to around 100 nm, and uniform particle size dispersion.

The invention provides a method for preparing 5-hydroxymethylfurfural from glucose by a one-pot method, which comprises the following steps: dissolving glucose in a mixed solvent of an organic solvent and water, contacting with a catalyst, placing in a closed high-pressure kettle, heating under inert atmosphere, stirring, reacting, cooling, filtering reaction liquid to remove solid particles, and storing 5-hydroxymethylfurfural in filtrate; wherein the catalyst is a metal modified SAPO-34 molecular sieve catalyst. The catalyst used in the invention has a similar core-shell structure, and the metal component on the outer layer is beneficial to enhancing the adsorption of glucose molecules, and is used as an L acid center to promote the isomerization of glucose into fructose molecules; the fructose continues to diffuse into the SAPO-34 molecular sieve and is subjected to isomerization reaction on B acid active sites of the molecular sieve, self-condensation of glucose molecules is avoided by the aid of shape-selective catalysis of the SAPO-34 molecular sieve, diffusion of the product 5-HMF is facilitated, and selectivity of the product 5-HMF is improved.

The invention develops a modified organic silicon pressure-sensitive adhesive and a preparation method thereof, and the method comprises the following steps: 1) in a nitrogen environment, uniformly mixing hydroxyl-terminated methyl polysiloxane, MQ resin, a diluent, aromatic polyol and / or fat polyol, then adding a catalyst, and heating for condensation reaction; and 2) adding a neutralizer into the condensation reaction liquid obtained in the step 1), and carrying out a neutralization reaction to obtain the modified organic silicon pressure-sensitive adhesive. According to the invention, by adding the fat polyol or aromatic polyol auxiliary agent into the organosilicon pressure-sensitive adhesive system, the compatibility of the pressure-sensitive adhesive system is improved, the condensation reflux process is more efficient, the condensation between MQ resin and raw rubber is promoted, and the hydroxyl residue is reduced; meanwhile, self-condensation of the MQ resin is promoted due to the existence of the polyhydric alcohol, and the stability of the MQ resin is improved; therefore, the performance of the aged pressure-sensitive adhesive is more stable due to the addition of the polyol.