19results about How to "Reduce polarity" patented technology

The application relates to the technical field of functional materials, in particular to a vinyl-modified magnesium-based flame retardant as well as a preparation method and application thereof, which comprises the following steps: adding water-magnesite into an ethanol solution to stir into a slurry, adding a modification aid, heating to 50-80 DEG C, constant-temperature stirring for 10-20 min, then filtering, drying, and obtaining the vinyl-modified magnesium-based flame retardant; the mass ratio of the water-magnesite to the modification aid is 1:(0.001-0.005). The vinyl-modified magnesium-based flame retardant does not contain halogen, has high-efficiency flame retardation, has good compatibility with high-molecular materials, and can improve the mechanical properties of high-molecular polymer materials when used.

This disclosure relates to the field of polymer emulsions, specifically to a method for preparing a peelable emulsion. The method includes: reacting glycidyl methacrylate, amino-terminated silicone oil, and sodium flakes at room temperature with stirring in the dark, and filtering to obtain double-bond modified silicone oil; separating a vinyl monomer into a first monomer and a second monomer, and dispersing the double-bond modified silicone oil in the first monomer to obtain a third monomer; preparing a pre-emulsion by ultrasonic emulsification of the second monomer, an emulsifier, and water; adding the pre-emulsion, an aqueous solution of the crosslinking monomer, and an aqueous solution of the first ammonium persulfate to a reaction vessel to form a core-phase emulsion; adding the third monomer and the aqueous solution of the second ammonium persulfate dropwise into the core-phase emulsion to form a core-shell emulsion; naturally cooling the core-shell emulsion, adjusting the pH to 7-8 with ammonia, and filtering to obtain a peelable emulsion. The method for preparing a peelable emulsion provided in this disclosure aims to overcome problems such as weakened peelable coating performance caused by excessive use of release agents.

This invention relates to the field of polymer foaming materials technology, and discloses a plant fiber composite nucleating agent for microfoaming of biodegradable materials and its application. The plant fiber composite nucleating agent is made from raw materials comprising the following parts by weight: 80-95 parts of primary ultrafine plant fiber powder, 5-20 parts of surface modifier, and 0.1-5 parts of dispersing lubricating wax; the surface modifier and dispersing lubricating wax are coated on the surface of the primary ultrafine plant fiber powder. The application steps are as follows: adding the plant fiber composite nucleating agent to a biodegradable material matrix to obtain a pre-foaming blend, introducing foaming gas or adding a chemical foaming agent for foaming treatment. The nucleating agent of this invention improves the compatibility between plant fibers and hydrophobic biodegradable matrices, provides heterogeneous nucleation sites in the matrix while increasing the polymer melt strength, inhibits cell coalescence and rupture, and obtains microfoamed materials with uniform pore size. Furthermore, the nucleating agent itself is completely biodegradable.

The present application relates to the technical field of external use patch, disclose a kind of neck shoulder waist leg pain health care patch and its preparation method, the health care patch includes backing layer, ointment layer and anti-adhesion release layer;Ointment layer raw material includes: traditional Chinese medicine extract flow leaching paste, L- (+) -tartaric acid, PVP K30, PEG-400, ternary eutectic solvent, polyacrylate pressure sensitive adhesive matrix and ultrafine medicinal powder.Preparation, after flow leaching paste, tartaric acid etc. are mixed, gel precursor is formed by vacuum dewatering and dealcoholization, swelling is added again with eutectic solvent, and then mixed with pressure sensitive adhesive matrix and medicinal powder high shear, finally coating solidification.The present application constructs physical crosslinking gel network in colloid interior and promotes effective component acid-base salt formation, effectively avoids polar component crystallization precipitation, reduces the skin irritation caused by drug burst release, simultaneously improves the cohesion of ointment, realizes long-acting smooth drug release.

The invention relates to the field of fluorescent dyes, in particular to a near-infrared fluorescent dye for brain imaging as well as a preparation method and application of the near-infrared fluorescent dye. The near-infrared fluorescent dye for brain imaging has the advantages of novel structure, good biocompatibility, large Stokes shift, high light stability, high fluorescence signal-to-noise ratio and the like; the near-infrared fluorescent dye prepared by the invention is simple in preparation process, mild in reaction condition, short in synthesis path and beneficial to industrial production, and has a wide application prospect.

The invention discloses a long-circulation lithium metal battery carbonic ester-based electrolyte as well as a preparation method and application thereof, and belongs to the technical field of lithium battery electrolytes. The carbonic ester-based electrolyte of the long-circulation lithium metal battery comprises the following components: lithium salt, a solvent and a saturated hydrocarbon additive, the solvent is fluoroethylene carbonate, methyl ethyl carbonate and fluoroether. According to the method, a polarity regulation and control strategy is proposed for the first time, the hydrocarbon additive is introduced into the fluorine-containing ether solvent and serves as a weak solvation medium, the polarity of the carbonic ester-based electrolyte is reduced, non-polar saturated hydrocarbon is successfully introduced into the electrolyte on the basis of the principle of similar miscibility, and the problem of bright phase separation is solved; the non-sacrificial electrolyte can significantly reduce the occurrence of side reactions in the electrolyte, and realizes long-term stable circulation of the lithium metal battery.

This invention discloses a method with a high proportion of supercage Na + This paper describes the application of exchange-site FAU molecular sieves for the adsorption and separation of fluorine-containing electron gases. The molecular sieve possesses the FAU molecular sieve configuration recognized by the International Zygotes Association (IZA), with a chemical composition molar ratio of Al₂O₃:mSiO₂:nNa₂O, where the molar ratio m of the oxide SiO₂ / Al₂O₃ ranges from 5 to 20. This molecular sieve is synthesized using an initial gel prepared from an organic template agent, water, silicon source, and aluminum source. FAU seed crystals are added, and the charge density of the organic template agent is adjusted. Different cage structures of the FAU molecular sieve are assembled. Furthermore, through mixing with a solid salt containing Na and solid-phase exchange, Na in the supercage is achieved. + Control of the exchange site ratio. Compared with the commercial molecular sieve USY2.6, this invention has a high proportion of supercage Na. + Exchange-site FAU molecular sieves can be used for the adsorption and separation of fluorine-containing electronic gases in gas-phase systems, especially pentafluorochloroethane C2F5Cl (R115) and hexafluoroethane C2F6 (R116), and the separation effect is good.

This invention discloses the use of a class of polysubstituted cyclic ether compounds as solvents for lithium-ion battery electrolytes. The polysubstituted cyclic ether compounds are alkyl-substituted cyclic ether solvents. These polysubstituted cyclic ether solvents have lower dielectric constants and lower ion desolvation energies, and exhibit good stability with lithium metal / graphite anodes. More importantly, these polysubstituted cyclic ether compounds have no special restrictions on the type of lithium salt. Using these polysubstituted cyclic ether compounds can significantly improve the low-temperature performance of batteries, thus broadening their applicability.

Provided is a method for analyzing proteoglycan, whereby proteoglycan in a sample can be easily analyzed. A sample containing proteoglycan is immersed or added to an aqueous solution containing a salt, and a purified precipitate obtained by adding an alcohol at a low specific concentration to the obtained liquid composition is subjected to proteoglycan analysis.

This invention discloses an industrial-scale chemical preparation method for 1,2-di fatty acid glycerides, comprising the following steps: (A) acetone glycerol is protected with a silyl ether protecting agent and purified by crystallization to obtain intermediate 1; (B) intermediate 1 undergoes a depropionyl protecting group reaction and crystallization to obtain intermediate 2; (C) intermediate 2 undergoes an esterification reaction and crystallization and adsorption to obtain intermediate 3; (D) intermediate 3 undergoes a desilyl ether protection reaction and recrystallization to obtain 1,2-di fatty acid glycerides. This invention, through crystallization purification under different conditions, avoids the disadvantages of traditional chemical methods for preparing 1,2-di fatty acid glycerides, such as the need for multiple column chromatography purification steps, low yield, and difficulty in industrialization. This method features mild operating conditions, high purity, and is easily scalable for large-scale industrialization.

The present application belongs to the technical field of traditional Chinese medicine extraction, and particularly relates to an extraction method of high-activity ginseng extract, which is used for improving the conversion and extraction efficiency of rare ginsenosides Rg1, Rg3, Rg5, Rh2 and Compound K. The extraction method combines microbial fermentation, electrostatic field wall breaking and supercritical CO2 extraction. The microbial fermentation treatment is mainly used for promoting the synthesis of ginsenosides, the high-voltage pulse electric field induces the electroporation effect of ginseng cells to increase the permeability of cell membrane and cell wall, the supercritical CO2 extraction has high cell permeability to improve the extraction rate and purity of ginsenosides, and in addition, the catalytic aid added in the extraction process is helpful to the conversion and catalysis of rare ginsenoside components.

The invention provides fatty acylation split-ring iridoid glycoside as well as a preparation method and application thereof, the fatty acylation split-ring iridoid glycoside comprises at least one of fatty acyl gentiopicroside, fatty acyl sweroside and fatty acyl swertiamarin, and the fatty acyl gentiopicroside is at least one of fatty acyl gentiopicroside, fatty acyl sweroside and fatty acyl swertiamarin. Wherein the fatty acyl gentiopicroside, the fatty acyl swertiamarin and the fatty acyl swertiamarin are respectively represented by a structural formula (I), a structural formula (II) and a structural formula (III), and a group R1, a group R2 and a group R3 are respectively and independently selected from alkyl or alkenyl with the carbon atom number of 5-21. The preparation method of the fatty acylation split-ring iridoid glycoside is also applied to preparation of a fatty acylation gentian plant extract. The fatty acylation split-ring iridoid glycoside and the fatty acylation gentian plant extract are used as raw materials to be applied to the field of medicine to play the roles of relieving, removing red, resisting inflammation, relieving itching, cleaning, emulsifying and resisting bacteria, and are also used as functional raw materials to be applied to the field of daily chemicals to play the roles of relieving, removing red, resisting inflammation, relieving itching, cleaning, emulsifying and resisting bacteria.

The invention discloses a silicon-containing polyurethane hybrid phenolic aerogel and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a phenol ring-terminated silicon-containing polyurethane prepolymer; (2) mixing the phenol ring-terminated silicon-containing polyurethane prepolymer with phenolic resin to prepare a mixed solution, adding a curing agent, and carrying out gel reaction to prepare silicon-containing polyurethane hybrid phenolic aldehyde wet gel; and (3) removing a liquid phase in the silicon-containing polyurethane hybrid phenolic aldehyde wet gel to obtain the silicon-containing polyurethane hybrid phenolic aldehyde aerogel. According to the invention, a phenol ring-terminated silicon-containing polyurethane prepolymer is synthesized, an organosilicon component is introduced into phenolic resin through a phenol ring, the heat resistance and flexibility of a linear polysiloxane structure are utilized to improve the mechanical properties and high-temperature oxidation resistance of phenolic aerogel, and the hydrophobic property of the phenolic aerogel is also improved.

The present application relates to the technical field of photovoltaic packaging materials, and discloses a white photovoltaic packaging adhesive film, a preparation process thereof and a photovoltaic module. The white photovoltaic packaging adhesive film has a multilayer composite structure, including a corrosion-resistant layer facing a photovoltaic cell, a reflective layer and an adhesive layer facing a photovoltaic backboard. The corrosion-resistant layer includes a low-polarity POE resin and / or an EVA resin with a VA content of less than or equal to 10%. The reflective layer includes a specific amount of EVA resin with a VA content of 15-25%, white pigment and insulating reinforced nano filler. The adhesive layer includes EVA resin with a VA content of 30-40% and composite silane coupling agent (including vinyl silane and isocyanate silane compounded at a mass ratio of 1-5:1) prepared at a weight ratio of 100:0.1-2. The white photovoltaic packaging adhesive film has the advantages of high reflectivity, high body resistance, strong peeling strength and peeling strength after hygrothermal aging, excellent corrosion resistance and PID resistance, and no white overflow.

The invention provides a multi-dimensional filler, a rubber composite material and a preparation method and application of the multi-dimensional filler and the rubber composite material. The multi-dimensional filler is obtained by mixing and reacting at least two fillers with different dimensions; the filler is a three-dimensional filler, a two-dimensional filler or a one-dimensional filler, and the surface of the filler contains hydroxyl. The preparation method of the multi-dimensional filler comprises the following steps: dispersing filler comprising at least two different dimensions into a solvent, and carrying out condensation reaction to obtain the multi-dimensional filler. The multi-dimensional filler can be used for preparing a rubber composite material, and the prepared multi-dimensional filler rubber composite material can be applied to tires. The prepared multi-dimensional filler is better in compatibility and dispersity, when the rubber composite material is prepared, the dispersity of the multi-dimensional filler in a rubber matrix can be effectively improved, the temperature rise and rolling resistance of the composite material are effectively reduced, and the wet skid resistance of the composite material is improved.

The invention relates to the technical field of fructus forsythiae extracts, in particular to a preparation method of a fructus forsythiae extract and application of the fructus forsythiae extract in shampoo, and the preparation method of the fructus forsythiae extract comprises the following steps: S1, pretreatment; s2, performing enzymolysis treatment; s3, microwave extraction; and S4, centrifugal purification. According to the method, the improved emulsion with the vitamin C-citric acid buffer solution as a water phase and the sunflower lecithin and the nonionic emulsifier as the compound emulsifier is used for low-temperature soaking treatment of the fructus forsythiae fruits, a brand-new extraction system is formed, the forsythin and the forsythiaside A in the fructus forsythiae can be effectively extracted, and the loss of the forsythin and the forsythiaside A can be reduced.

This application relates to the field of cable technology, disclosing a flexible high-strength insulated cable material, its preparation method, and a power cable. The material formulation includes ethylene propylene diene monomer (EPDM) rubber, ethylene-octene copolymer, magnesium hydroxide, solid maleic anhydride, zinc methacrylate, α-methylstyrene dimer, dicumyl peroxide, and a compound antioxidant. During processing, the maleic anhydride undergoes ring-opening upon heating, consuming free water on the surface of magnesium hydroxide in situ, thus improving powder dispersion. The α-methylstyrene dimer acts as a chain transfer agent, inhibiting the long-chain homopolymerization of zinc methacrylate and preventing the formation of hard, brittle crosslinking points within the matrix. The polar graft ends and the hydroxyl groups on the magnesium hydroxide surface construct a reversible coordination network containing metal ion bonds. This invention solves the problems of difficult dehydration and brittle crosslinking in highly filled flame-retardant materials, enabling the material to dissipate strain energy through ion node slippage when stretched or bent, thus possessing high flame retardancy, high tensile strength, and excellent flexibility.

The present application relates to the technical field of high-performance electronic materials, and particularly relates to an inorganic powder modified epoxy resin prepreg for high-frequency high-speed printed circuit board and a preparation method thereof. The prepreg is prepared by impregnating a low-dielectric glass fiber cloth with a resin glue solution and drying, wherein the resin glue solution comprises an epoxy resin composition, a curing agent and an inorganic powder; the inorganic powder is hollow mesoporous silica nanospheres modified by p-chlorophenyl urea loading and hyperbranched polymer grafting. Through functional powder structure design and resin system optimization, the prepreg realizes low dielectric loss, high heat resistance, excellent interfacial bonding strength and good process stability in a synergistic manner, and is suitable for the preparation of high-frequency high-speed copper-clad boards.