2598 results about "Propylene glycol" patented technology

The invention relates to the technical field of immunology, and discloses a QS-21 composite adjuvant as well as a preparation method and application thereof, and the QS-21 composite adjuvant comprises the following components in parts by weight: 0.1-0.5 part of QS-21; 4 to 6 parts of liposome; 0.05 to 0.1 part of CpG oligonucleotide; 0.1 to 0.3 part of a freeze-drying protective agent; 0.2 to 0.5 part of a stabilizing agent; 3 to 5 parts of propylene glycol; 1-2 parts of ethanol; 5-15 parts of an organic solvent chloroform; the liposome is prepared from the following components in parts by weight: 3 to 4 parts of phospholipid distearate; and 1-2 parts of amino lipid. By compounding the liposome carrier and the QS-21, adding the CpG oligonucleotide and optimizing the freeze-drying protective agent, the loading efficiency of the immunologic adjuvant, the immune effect stability and the restorability after freeze-drying are improved, and the durability and efficacy of immune response are enhanced.

The invention discloses unsaturated polyester resin for imitation jade handicrafts and a preparation method thereof, and belongs to the technical field of polyester resin. Comprising the following components: diethylene glycol, methylpropanediol, propylene glycol, maleic anhydride, phthalic anhydride, an antioxidant, a polymerization inhibitor, paraffin, a stabilizer, an ultraviolet light absorber, a whitening agent and a diluent. The weight ratio of the propylene glycol to the methyl propylene glycol is (1.0-1.3): 1, and the methyl propylene glycol accounts for 20-22% of the total amount of the dihydric alcohol; the weight ratio of maleic anhydride to phthalic anhydride is (0.46-0.52): 1; the preparation method comprises 1) adding the raw materials and the antioxidant into a reactor, carrying out heating, carrying out heat preservation for 0.5-1.0 h and continuing heating, 2) carrying out a reaction for 2-3 h after heating, carrying out dehydration until an acid value is 20-25 mgKOH / g, and 3) carrying out cooling, adding the auxiliary agent and carrying out uniform mixing so that the unsaturated polyester resin is obtained.

The invention belongs to the technical field of polyurethane elastomers, and particularly relates to a high-static-rigidity high-damping low-pressure-change polyurethane elastomer and a preparation method thereof. Comprising a polyol component and an isocyanate component, and the polyol component comprises polyol A, a chain extender, a stabilizer, a hydrolysis-resistant agent and a catalyst; the isocyanate component is prepared from isocyanate, polyhydric alcohol B and branched chain unit alcohol; the polyol A comprises amine ether polyol and polytetrahydrofuran ether polyol; the polyhydric alcohol B comprises bio-based hydrolysis-resistant polyhydric alcohol and polytetrahydrofuran ether polyhydric alcohol; the bio-based hydrolysis-resistant polyol is prepared by carrying out a reaction on sebacic acid, 1, 2-propylene glycol and 1, 4-butanediol; the branched-chain unit alcohol is prepared from tetrahydrofuran and isooctanol through a reaction. By introducing the bio-based hydrolysis-resistant polyhydric alcohol and branched chain monohydric alcohol, the damping effect is remarkably enhanced, and on this basis, through formula adjustment and raw material screening, the product toughness is greatly improved, the compression set is reduced, and the performance of the product in heavy haul railway application is effectively optimized.

The invention discloses a cosmetic composition and a preparation method thereof, and belongs to the technical field of cosmetics. The invention discloses a chamomile essential oil toner which is mainly prepared from the following raw material components in parts by mass: 10 to 20 parts of modified toner, 50 to 60 parts of water, 4 to 6 parts of glycerol, 2 to 4 parts of propylene glycol, 0.8 to 1.2 parts of sodium chloride, 6.5625 to 7.875 parts of chamomile essential oil polymer micelle, 2.1875 to 2.625 parts of adhesive, 10.5 to 11.5 parts of capric triglyceride and 0.8 to 1.2 parts of cetyl polyethylene glycol. Through the synergistic effect of the modified toner and chamomile essential oil polymer micelles in a specific ratio, the dispersion stability of the toner is improved, meanwhile, the slow release effect of active ingredients is enhanced, and the chamomile essential oil toner has the advantages that the makeup holding property, the storage stability and the mildness are improved, meanwhile, the toner dispersity is improved, and the sensitive skin stimulation risk is reduced.

The invention discloses roe polypeptide essence water, which is prepared from a water phase component, an active component, an oil phase component, a stabilizer and a thickening agent, the water phase component is prepared from the following components in parts by mass: 60 to 150 parts of purified water, 3 to 7 parts of glycerol, 2 to 5 parts of propylene glycol, 1 to 2 parts of panthenol and 0.1 to 0.3 part of sodium hyaluronate; the oil phase component is prepared from the following components in parts by mass: 2 to 4 parts of squalane, 1 to 3 parts of jojoba oil and 0.5 to 2 parts of shea butter; the active components comprise the following components in parts by mass: 2 to 5 parts of roe extract, 0.5 to 2 parts of argireline, 0.1 to 0.5 part of oligopeptide-1, 1 to 3 parts of collagen, 0.5 to 2 parts of elastin and 2 to 5 parts of nicotinamide; 0.1 to 0.3 part of hydroxyethyl cellulose is adopted as the stabilizer; 0.2 to 0.5 part of carbomer is adopted as the thickening agent. The roe extract is rich in proteins, amino acids, fatty acids, vitamins and trace elements, and is helpful for nourishing the skin so as to provide the effects of nourishing, resisting aging, moisturizing, brightening the skin color and repairing the skin.

The invention belongs to the technical field of flame-retardant materials, and particularly relates to a phenylboronic acid-based P / N / B-containing halogen-free flame retardant, a preparation method thereof and application of the phenylboronic acid-based P / N / B-containing halogen-free flame retardant in epoxy resin. The preparation method comprises the following steps: by taking diphenyl hypophosphorous chloride as a basis, preparing a flame-retardant intermediate through nucleophilic substitution reaction between diphenyl hypophosphorous chloride and an aldehyde group-containing phenolic compound, then reacting a phenylboronic acid structure with 3-amino-1, 2-propylene glycol to obtain an amino group-containing phenylboronic acid compound, and finally reacting the phenylboronic acid compound with 3-amino-1, 2-propylene glycol to obtain the amino group-containing phenylboronic acid compound. And finally, carrying out a Schiff base reaction on the flame-retardant intermediate and an amino-containing phenylboronic acid compound to obtain the halogen-free flame retardant containing phosphorus, nitrogen and boron elements. The flame retardant provided by the invention can significantly improve the flame retardant property and mechanical property of epoxy resin. A flame-retardant epoxy resin prepared based on the flame retardant; the influence on Tg of an epoxy resin cured product is small, the smoke suppression and char formation performance and the mechanical performance of the cured product can be remarkably improved, and meanwhile, the flame retardant has excellent flame retardant efficiency; the limit oxygen index of the flame-retardant epoxy resin can reach 31%; the vertical combustion grade is V-0 or above, and the carbon residue amount can reach 18% or above.

The invention belongs to the technical field of oil and gas development, and particularly relates to an oil and gas well blocking remover and a preparation method thereof. The blocking remover comprises the following components: 5-8% of low-carbon composite organic acid, 5-7% of fluoboric acid, 6-9% of ammonium bifluoride, 4-6% of an anti-acid sludge mutual solvent, 2-4% of a corrosion inhibitor, 2-4% of polyoxypropylene polyoxyethylene propylene glycol ether, 8-12% of a permeation dispersion surfactant, 2-5% of a sulfur dissolving agent, 2-5% of a stable chlorine dioxide solution and the balance of water. The preparation method comprises the following steps: adding the low-carbon composite organic acid, the fluoboric acid and the ammonium bifluoride into water and stirring; adding an acid sludge resisting mutual solvent and a sulfur dissolving agent, and stirring; adding the corrosion inhibitor, the polyoxypropylene polyoxyethylene propylene glycol ether and the permeation dispersion surfactant, and stirring; and finally, reducing the stirring speed, adding the stable chlorine dioxide solution, and stirring to uniformly mix. The blocking remover provided by the invention is comprehensive in blocking removal function, very good in dissolving and dispersing performance on complex blocking substances, very small in corrosion damage to a shaft pipe wall and wide in applicability.

The invention discloses a collagen composition for skin substrate repair and skin care application thereof, and the collagen composition comprises the following components: 1-3% of soluble III-type collagen, 1-5% of hyaluronic acid, 1-2% of plant extract, 0.1-0.5% of allantoin, 0.2-0.5% of dipotassium glycyrrhizinate, 1-5% of glycerol, 1-5% of butanediol, 1-5% of 1, 2-propylene glycol, 1-5% of 1, 3-propylene glycol, 1-5% of propylene glycol and the balance of water. The cleaning agent is prepared from the following components in percentage by weight: 1 to 2 percent of 1, 2-hexanediol, 0.1 to 0.5 percent of phenoxyethanol, 0.1 to 0.5 percent of ethylhexylglycerin, 0.1 to 0.5 percent of carbomer, 0.1 to 0.5 percent of triethanolamine and the balance of water. The collagen III is added, so that the problems of wrinkles and skin aging are remarkably relieved. According to the skin-care lotion, the oily composition and the water-based composition are reasonably proportioned, so that excellent moistening and moisturizing effects are provided, the moisture balance of the skin is favorably maintained, and the skin is kept soft and moist. The added plant extract, hydrolyzed protein and mineral substances not only nourish and repair the skin, but also can improve various skin problems, enhance the endurance capacity of the skin and avoid the condition that the skin wrinkles are increased during the period of stopping using.

The invention relates to the technical field of flame retardance, and discloses a flame-retardant coating and a preparation method thereof.The flame-retardant coating is obtained by adding phenolic resin, polycarbonate, phosphorus-containing modified phenolic resin, boric acid-containing benzoxazine, an organic silicon resin defoaming agent, a propylene glycol film-forming agent and water into a stirrer and stirring. The flame-retardant coating contains a large amount of anacardol, long chains in the anacardol can also be crosslinked to form a net-shaped structure, a net-shaped carbon skeleton structure is formed under high-temperature carbonization, degradation products are inhibited during combustion, and the flame-retardant coating has good fire resistance; wherein oxazolidinone generated by reaction of an epoxy group of epoxidized phenolic resin and an isocyanate group of hexamethylene diisocyanate is a heterocyclic ring with very high heat resistance and also plays a role in synergistic fire resistance; the flame-retardant coating contains a large amount of phosphorus elements, sulfur elements and nitrogen elements, has a good flame-retardant effect, and achieves a synergistic flame-retardant effect.

The invention relates to the technical field of glass white board ink, and discloses high-gloss and high-covering ink for a glass white board and a preparation method thereof, the high-gloss and high-covering ink comprises the following raw materials by mass: 30-35 parts of pigment, 2-5 parts of composite diatomite, 8-10 parts of a dispersant, 3-7 parts of resin, 0.2-0.5 part of a wetting agent, 50-60 parts of deionized water, and 5-8 parts of propylene glycol. The nano titanium dioxide has high refractive index and light scattering performance, so that the ink can fully reflect light under illumination, and the nano titanium dioxide and the diatomite have a relatively good synergistic effect in the aspect of improving the glossiness of the ink; the lamellar structure of the graphene oxide can effectively cover the ground color of the glass white board, and a high covering effect is achieved; a hydrophilic chain segment of the amphiphilic block copolymer extends in an ink system, and a hydrophobic chain interacts with the lipophilic pigment, so that the stability and the covering effect of the ink are improved.

The invention discloses unsaturated polyester resin for an unmanned aerial vehicle fuselage and a preparation method of the unsaturated polyester resin, and relates to the field of high polymer materials. When the unsaturated polyester resin for the unmanned aerial vehicle fuselage is prepared, a flame-retardant monomer reacts with 2-hydroxy-5-(hydroxymethyl) benzaldehyde to prepare a modified flame-retardant monomer; reacting cellulose with acrylic acid to obtain pre-modified cellulose; the pre-modified cellulose, 1-allyl-1, 1, 3, 3-tetramethyldisiloxane and chloroplatinic acid are subjected to a reaction, and modified cellulose is prepared; maleic anhydride, 5-(1H-imidazole-1-yl)-1, 3-phthalic acid, propylene glycol and the modified flame-retardant monomer are subjected to a reaction, and pre-polyester is prepared; and stirring the pre-polyester, zinc chloride, modified cellulose, benzophenone peroxide and styrene to obtain the anti-aging coating. The prepared unsaturated polyester resin for the unmanned aerial vehicle fuselage has good anti-aging, self-repairing, flame-retardant and self-cleaning performance.

The invention discloses a method for catalytically synthesizing lactide by using a kaolin-based catalyst, which comprises the following steps: (1) preparing oligomeric lactic acid: carrying out lactic acid dehydration polymerization reaction by using L-lactic acid or D-lactic acid or DL-lactic acid as a raw material to obtain oligomeric lactic acid of which the weight-average molecular mass of an oligomer is 1000-3000Da; and (2) depolymerizing the oligomeric lactic acid: carrying out depolymerization reaction on the oligomeric lactic acid obtained in the step (1) under the action of a kaolin-based catalyst to obtain crude lactide. The raw materials of the catalyst are easy to obtain, the cost is low, the regeneration process is simple, the reaction temperature of depolymerization cyclization is low, the reaction time is short, and the cost can be greatly reduced in industrial production.

The invention discloses a method for preparing high-purity uranium carbide microspheres by a microfluidic-assisted internal gelation process, which comprises the following steps of: designing a uranium glue solution component containing carbon black to obtain a uranium glue solution which is stable for a long time at room temperature and quickly gelates at high temperature; the preparation method comprises the following steps: preparing gel microspheres with uniform size by using a uranium glue solution as a micro-fluidic dispersion phase through a micro-fluidic assisted inner gel process; the pore structure in the gel microspheres is maintained through washing and soaking with propylene glycol monomethyl ether, so that the crack-free gel microspheres are obtained; the UC nuclear fuel microspheres which are uniform in size, good in sphericity degree and high in phase purity are prepared through the carbon thermal reduction reaction of the non-cracking gel microspheres under the optimized sintering schedule, and development of ultrahigh-temperature gas cooled reactor nuclear fuel is expected to be promoted.

The invention discloses negative electrode slurry and a preparation method thereof, a negative electrode plate and a lithium ion battery, the negative electrode slurry comprises a negative electrode material, the negative electrode material comprises a negative electrode active substance with the mass content of 85%-98% and a surface tension regulator with the mass content of 0.1%-5%, the surface tension regulator is at least two of isopropanol, propylene glycol and allyl alcohol. According to the invention, the problem of vertical lines and even cracking during coating of the pole piece can be improved, the cycle performance and the safety performance of the battery are ensured, and meanwhile, environmental pollution is avoided.

The invention provides an anti-aging and whitening pyracantha fortuneana fruit extract prepared by adopting a supramolecular solvent and a preparation method of the pyracantha fortuneana fruit extract, and relates to the technical field of biological extraction. The preparation method comprises the following steps: by taking betaine as a hydrogen bond acceptor and 1, 3-propylene glycol as a hydrogen bond donor, mixing and self-assembling the betaine and the 1, 3-propylene glycol to form a supramolecular solvent; and the pyracantha fortuneana fruits are extracted by adopting the supramolecular solvent. The pyracantha fortuneana fruit active ingredients are extracted by adopting the supramolecular solvent which is harmless to the skin, so that the irritation of the solvent to the skin can be avoided, the supramolecular solvent can be specifically combined with the active ingredients in the pyracantha fortuneana fruit, and the purity and activity of the active ingredients are improved. The pyracantha fortuneana fruit extract extracted by adopting the supramolecular solvent has better oxidation reduction resistance; generation of non-enzymatic glycosylation intermediate products is inhibited, and saccharification and aging resistance are facilitated; the red blood cell oxidative damage is improved, and the effects of resisting oxidation and relieving are achieved; the whitening mask has an inhibiting effect on elastinase and tyrosinase, and can resist aging, whiten skin, relieve facial pigmentation and brighten the skin.

The invention discloses high-temperature-resistant and corrosion-resistant unsaturated polyester resin for a grid and a preparation method thereof, and belongs to the technical field of unsaturated polyester resin. The raw materials comprise the following components in parts by weight: 330 to 400 parts of isophthalic acid, 55 to 80 parts of 1, 4-cyclohexanedimethanol, 150 to 200 parts of ethylene glycol, 125 to 220 parts of first reaction stage propylene glycol, 0.2 to 0.6 part of a catalyst, 0.1 to 0.3 part of a first reaction stage antioxidant, 90 to 120 parts of second reaction stage propylene glycol, 30 to 50 parts of phthalic anhydride, 300 to 380 parts of maleic anhydride, 0.1 to 0.3 part of a second reaction stage antioxidant, 0.1 to 0.5 part of a polymerization inhibitor and 600 to 630 parts of a cross-linking agent. The high-temperature-resistant and corrosion-resistant unsaturated polyester resin for the grating has the characteristics of high corrosion resistance, high temperature resistance and high mechanical property, is low in cost and is suitable for being used as a raw material for manufacturing the grating.

The invention discloses an all-solid-state composite dry conductive agent and a preparation method thereof, and belongs to the technical field of batteries. The all-solid-state composite dry conductive agent is prepared by the following steps: uniformly mixing carbon nanotubes, high-dispersion carbon black and graphene to obtain a primary mixture; then preparing a uniformly dispersed glue solution from the composite dispersant and water; and then adding the primary mixture into the glue solution, uniformly mixing, sanding, homogenizing, drying and crushing to obtain the product, the high-dispersion carbon black is obtained by oxidizing carbon black to form active groups such as carboxyl and hydroxyl on the surface of the carbon black, halogenating acyl and then reacting with lithium 2, 5-diaminobenzene sulfonate. The preparation method comprises the following steps: grafting histidine ester into carboxymethyl cellulose by using propylene glycol diglycidyl ester as a cross-linking agent, then introducing allyl-1, 3-sultone, then copolymerizing with lithium 2-acrylamido-2-methylpropanesulfonate and 3-aminobenzoic acid allyl ester protected by fluorenylmethoxycarbonyl, and then deprotecting to obtain the composite dispersant.

The invention belongs to the technical field of personal hygiene products, and particularly relates to a nursing wet tissue which comprises a non-woven fabric body and formula production liquid, and the front end of the non-woven fabric body is provided with an opening; the formula production liquid comprises the following components: glycerol, propylene glycol, menthol, PEG-40 hydrogenated castor oil, benzalkonium chloride, phenoxyethanol, an aloe vera leaf extract, citronella oil, eucalyptus oil, bisabolol, G2833 (S) Baogoli LW-210060 and the balance of deionized water, wherein the total percentage of the components is 100%. According to the nursing wet tissue, in a sports scene, the nursing wet tissue can be fixed during use through the design of the opening and is prevented from sliding off; volatile oil components in menthol and peppermint oil in the formula production liquid can penetrate into the skin and act on pores, the pores can be effectively shrunk, the aperture of the pores is reduced, and therefore the chance that external dirt and grease enter the pores is reduced.

The invention discloses ice glazing liquid for ice glazing of mussels. The ice glazing liquid is prepared from the following components in percentage by mass: 0.1 to 0.12 percent of sodium polyacrylate, 0.05 to 0.07 percent of sodium erythorbate, 0.01 to 0.03 percent of citric acid, 1 to 1.2 percent of sodium lactate, 0.4 to 0.6 percent of alginate oligosaccharide, 0.1 to 0.12 percent of xanthan gum, 7 to 9 percent of propylene glycol and the balance of water. The ice glaze liquid for ice glaze plating of the mussels is reasonable in compatibility, simple and easily available in components and good in adhesiveness, the formed ice glaze is not easy to crack, the dry loss rate can be reduced, and the quality of the thawed mussels can be ensured. The invention further provides a preparation method of the ice glaze liquid for ice glaze plating of the mussels. The preparation method is simple in process step, high in operability and uniform in component dispersion.

The invention provides recombinant ensifer adhesion as well as a construction method and application thereof. The recombinant ensifer adhesion provided by the invention is applied to preparation of 1, 3-propylene glycol through mixed fermentation with recombinant escherichia coli, and glycerol can be converted into 1, 3-propylene glycol without adding expensive coenzyme vitamin B12 in the fermentation process. And the ensifer adhesion and recombinant escherichia coli mixed bacterium system has good synergy, the growth of the recombinant ensifer adhesion does not generate obvious interference on the escherichia coli in the mixed bacterium system, and the normal growth and metabolism state of the escherichia coli can be basically kept. Experiments prove that after the recombinant ensifer adhesion and the recombinant microorganism escherichia coli are subjected to mixed fermentation, the product yield can be higher than that of fermentation of single-strain recombinant escherichia coli.

The invention relates to hydrolysis-resistant polyester polyol with high bio-based content, polyurethane resin for a synthetic leather surface layer and a preparation method of the hydrolysis-resistant polyester polyol. The hydrolysis-resistant polyester polyol with high bio-based content comprises the following raw materials: bio-based dihydric alcohol, bio-based dibasic acid, an antioxidant and a catalyst. In the hydrolysis-resistant polyester polyol with high bio-based content, provided by the invention, the bio-based dihydric alcohol not only comprises micromolecular bio-based 1, 3-propylene glycol, but also comprises low-carbon environment-friendly long-chain polypropylene carbonate dihydric alcohol with molecular weight of 1000, so that the crystallinity and hardness of the bio-based polyester polyol are reduced; the hydrolysis resistance and flexibility of the bio-based polyester polyol are improved, the hydrolysis resistance of polyurethane resin for a synthetic leather surface layer prepared from the hydrolysis-resistant polyester polyol with the high bio-based content is synchronously improved, and the stable dispersion performance of pigment is good.

The invention provides mupirocin ointment as well as a preparation method and an application method thereof. The weight of mupirocin accounts for 0.1-0.5% of the total weight of the ointment. The water-soluble matrix is selected from polyethylene glycol, glycerol, propylene glycol or a mixture thereof. The stability and the curative effect of the medicine can be improved, and meanwhile, the safety and the use convenience of the ointment are ensured.

The invention belongs to the field of biology, and particularly relates to a fusion protein for promoting synthesis of 1, 3-propylene glycol and application of the fusion protein. The fusion protein NADPH (Nicotinamide Adenine Dinucleotide Phosphate) dependent alcohol dehydrogenase fusion protein or NADH (Nicotinamide Adenine Dinucleotide Hormone) dependent alcohol dehydrogenase fusion protein disclosed by the invention can be packaged into diol dehydratase and can promote the synthesis of 1, 3-propylene glycol. Experiments prove that the bacillus subtilis has an effect of improving the fermentation performance of the strain.

The invention relates to the technical field of coatings, and discloses a flame-retardant epoxy resin coating and a preparation method thereof.The flame-retardant epoxy resin coating is prepared by adding bisphenol A type epoxy resin, propylene glycol, phosphorus-containing modified imidazolyl benzoxazine, a chitosan-based flame retardant, titanium dioxide, a BYK-071 defoaming agent, a BYK-345 flatting agent, a BYK-220S wetting dispersant and water into a stirrer, stirring, adding a curing agent, stirring, adding a curing agent, and stirring to obtain the flame-retardant epoxy resin coating. The flame-retardant epoxy resin coating is obtained after the reaction is finished. Phosphorus, silicon and benzoxazine structures in the phosphorus-containing modified imidazolyl benzoxazine and the chitosan-based flame retardant all have better flame-retardant effects, and the phosphorus, silicon and benzoxazine structures in the phosphorus-containing modified imidazolyl benzoxazine and the chitosan-based flame retardant have better flame-retardant effects. Chitosan in the chitosan-based flame retardant also has a good flame retardant effect and an antibacterial effect. Benzoxazine can form a heat-resistant phenolic resin structure at high temperature, so that the benzoxazine has a relatively good flame-retardant effect; and an imidazole group in the phosphorus-containing modified imidazolyl benzoxazine also has a relatively good antibacterial effect.

The invention discloses a preparation method of minoxidil liniment. The preparation method comprises the following steps: uniformly mixing propylene glycol, absolute ethyl alcohol and about 40% purified water until no obvious layering exists, and finally adding minoxidil to stir and dissolve to obtain the minoxidil liniment. According to the preparation process provided by the invention, purified water and absolute ethyl alcohol can form a latent solvent, so that the solubility of minoxidil in a single auxiliary material is greatly improved, and subsequent preparation of the digoxin injection is facilitated.

The invention relates to the technical field of polyester resin, and discloses outdoor hydrolysis-resistant polyester resin and a preparation method and application thereof.The outdoor hydrolysis-resistant polyester resin is prepared from, by weight, 30-38 parts of polyhydric alcohol, 48-50 parts of binary acid, 20.5-28.5 parts of acidolysis agent and 0.1-0.12 part of onium salt curing accelerator; according to the invention, 2-butyl-2-ethyl-1, 3-propylene glycol is used as polyol, and an alkyl side chain is introduced into polyester molecules to generate steric hindrance and shielding effects, so that water molecules are difficult to attack adjacent lipid bonds, and the hydrolysis resistance of the polyester resin is improved. 2, 2 '-[(2-hydroxy-3-phenoxy propyl) azadiyl] diethanol contains a benzene ring structure with thermal stability, and is crosslinked into a polyester molecular chain, so that the glass transition temperature of the polyester resin can be increased, the heat resistance can be improved, and the boiling water resistance of a resin coating can be improved.

The invention discloses application of AgNWs (at) CdZnS2 (at) Cd, Zn-ZIF-8 core-shell structure in photocatalysis and extraction of uranium from seawater, and a method comprises the following steps: filling propylene glycol containing PVP into a bottle, and magnetically stirring and heating in an oil bath; the preparation method comprises the following steps: firstly, adding NaCl into the mixed solution, continuously stirring, adding an AgNO3 solution, magnetically stirring and heating the mixed solution, collecting precipitates, and washing the precipitates with acetone and ethanol respectively to obtain gray AgNWs; the preparation method comprises the following steps: adding 2-methylimidazole into an organic solvent solution containing organic amine, mixing AgNWs, adding into an organic solvent solution of cadmium salt and zinc salt, stirring at room temperature, standing, and carrying out solid-liquid separation to obtain AgNWs (at) ZIF8; the preparation method comprises the following steps: adding AgNWs (at) ZIF8 into an organic solvent, dropwise adding an organic solvent solution of the AgNWs (at) ZIF8 into the organic solvent containing thiourea in a grinding process, heating the mixture in a water bath, carrying out vacuum drying at room temperature, and cooling to room temperature after the reaction is finished, so as to obtain the AgNWs (at) CdZnS2 (at) Cd, Zn-ZIF-8 photocatalytic material. According to the invention, AgNWs (at) ZIF8 is used as a precursor to prepare an AgNWs (at) CdZnS2 (at) Cd, Zn-ZIF-8 core-shell structure, and the core-shell structure has excellent ability to extract uranium from seawater.

The present invention provides a cyclic carbonate synthesis method, and belongs to the technical field of organic ester compound synthesis, and the cyclic carbonate synthesis method comprises the following steps: S1, 1, 3-propylene glycol, a dehydrating agent and a catalyst are added into a high pressure reaction kettle, and CO2 is introduced into the high pressure reaction kettle for a reaction; s2, after the reaction is finished, after the high-pressure reaction kettle is cooled to the room temperature, redundant gas in the high-pressure reaction kettle is discharged, after the gas in the high-pressure reaction kettle is completely discharged, the high-pressure reaction kettle is opened, the catalyst is filtered out, and the solution is subjected to vacuum-pumping separation to obtain a target product; the catalyst is a heterogeneous catalyst MxOy (at) Zn-dpot. Carbon dioxide conversion is carried out in a chemical utilization mode, a chemical product trimethylene carbonate can be produced, the synthesis route is easy to operate, and after the MxOy at Zn-dpot catalyst is added, the yield is high, the high additional value is achieved, and the green chemistry concept is met.

The invention relates to the technical field of pharmaceutical preparations, and provides a minoxidil film coating agent as well as a preparation method and application thereof. The minoxidil film coating agent provided by the invention comprises 40-60% of propylene glycol, 3-7% of polyvinyl alcohol, 20-30% of ethanol, 1-7% of minoxidil and the balance of water. According to the invention, propylene glycol is taken as a solvent, a plasticizer and a transdermal absorption enhancer, polyvinyl alcohol is taken as a film-forming material, and ethanol is taken as a volatile agent, after administration, ethanol is volatilized to promote film formation of polyvinyl alcohol, and propylene glycol enhances the plasticity of the formed film, so that the effect of reducing liquid medicine loss is achieved, the local medicine concentration is increased, and the bioavailability is improved. The minoxidil liniment disclosed by the invention has excellent skin permeability, can effectively convey a medicine to a required part, and can ensure that the medicine is released at a fixed position of the skin and is accurately administered in a medicine release process, so that the stimulation of liquid medicine flow to other parts is reduced, and a good treatment effect is achieved.

The invention belongs to the technical field of medical materials, and particularly relates to a tooth whitening composition and a preparation method thereof, the tooth whitening composition comprises the following components by weight: 5%-15% of hydrogen peroxide, 0.5%-1.5% of a gel matrix, 0.2%-1.0% of a thickener, 5%-10% of a humectant, 3%-8% of propylene glycol, 0.05%-0.2% of a chelating agent, 1%-3% of a sweetener, 0.1%-0.5% of sodium fluoride, and the balance of water. Aiming at the problems that an existing tooth whitening product is relatively low in pH value (most of 4.0-5.0), easy to irritate gingiva and sensitive in tooth manufacturing, and the existing tooth whitening product needs to be stored in a dark place at a low temperature and is short in whitening validity period, the pH value of the product is adjusted to 5.5-6.5, so that the product is close to oral saliva, the irritation can be reduced, the stability of the product can be ensured, the product is not easy to decompose, and the tooth whitening effect is good. Active ingredients are prevented from losing efficacy in advance, and the whitening validity period is prolonged.