51 results about "Sodium bisulphite" patented technology

The invention provides transparent high-impact-resistance heat-resistant MBS (methyl methacrylate-butadiene-styrene) resin and a preparation method thereof, and relates to the field of high polymer material preparation methods, the transparent high-impact-resistance heat-resistant MBS resin is prepared from the following raw materials: water, ethanol, maleic anhydride, an emulsifier, MBS resin grafted latex, potassium persulfate and an antioxidant; the MBS resin grafted latex is prepared from the following raw materials: water, modified styrene-butadiene latex, sodium hydrogen sulfite, potassium persulfate, methyl methacrylate and styrene, the modified styrene-butadiene latex is prepared from the following raw materials: a pre-emulsion, glycidyl methacrylate, ammonium persulfate, divinyl benzene and potassium persulfate; the pre-emulsion is prepared from the following raw materials: water, an emulsifier, butadiene and styrene. The product is good in heat resistance and good in PVC modification effect, and the modified PVC composite material is high in light transmittance, high in cantilever beam impact strength and resistant to aging.

The invention relates to the field of adhesives, and discloses an environmentally friendly urea-formaldehyde resin adhesive and a preparation method thereof. The environmentally friendly urea-formaldehyde resin adhesive comprises the following components in parts by weight: 45-60 parts of urea, 50-80 parts of formaldehyde solution, 10-25 parts of a modified additive, and 5-15 parts of modified polyvinyl alcohol; the modified additive is a modified additive prepared by grafting isophorone diisocyanate onto multi-walled carbon nanotubes loaded with nano-titanium dioxide and further sealing isocyanate with sodium bisulfite; the modified polyvinyl alcohol is modified polyvinyl alcohol grafted with sodium methyl silicate. The invention reduces the free formaldehyde content in the prepared urea-formaldehyde resin adhesive by adding the modified additive and the modified polyvinyl alcohol, and the prepared plywood has low formaldehyde release, is safe and environmentally friendly, and has excellent bonding strength and water resistance.

The invention provides a film agent of lumepirone or salt thereof and a preparation method of the film agent, and relates to the technical field of medicines. The lumepirone injection comprises the following raw materials in parts by mass: 2-30 parts of lumepirone or pharmaceutically acceptable salt thereof, 40-95 parts of a film-forming material, 1-30 parts of a plasticizer and 0.1-5 parts of an antioxidant, the antioxidant is selected from at least one of butylated hydroxyanisole, butylated hydroxytoluene and sodium hydrogen sulfite. The film agent is used for drug delivery through oral mucosa or a sublingual way, so that the bioavailability of the drug can be remarkably improved, the blood concentration can be increased, the drug content in the brain and the D2 target spot occupancy rate can be increased, and the curative effect of the film agent can be effectively enhanced.

The invention discloses zwitterionic concrete internal curing hydrogel based on humidity-pH dual responsiveness and a preparation method of the zwitterionic concrete internal curing hydrogel, and belongs to the technical field of building materials. The water-based cleaning agent is prepared from the following raw material components in percentage by weight: 6%-8% of N-vinyl imidazole, 8%-12% of 2-methylimidazole, 6%-8% of 2-acrylamido-2-methylpropanesulfonic acid, 2%-4% of sodium p-styrenesulfonate, 26%-30% of acrylic acid, 18%-21% of N-vinyl pyrrolidone, 15%-18% of glycidyl methacrylate, 2%-5% of nano montmorillonite powder, 0.05%-0.1% of divinyl benzene, 0.05%-0.15% of N, N-dimethylformamide and the balance of water. The invention discloses an anti-freezing agent which is prepared from the following components in percentage by weight: 0.1%-0.3% of N, N-methylene bisacrylamide, 0.1%-0.3% of 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propane-1-ketone, 0.5%-0.8% of ammonium persulfate and 0.5%-0.8% of sodium hydrogen sulfite. Double response to the internal humidity and pH value of the concrete can be achieved, and the requirement for precise internal curing of modern high-performance concrete is met.

The invention discloses a preparation method of a metal-doped manganese dioxide aqueous zinc ion battery positive electrode material, which comprises the following steps of: preparing a solution from any one of potassium permanganate, potassium manganate, sodium permanganate and sodium manganate, and recording the solution as a solution A; preparing a solution from any one of oxalic acid, citric acid, formic acid, acetic acid, sodium hydrogen sulfite and phosphorous acid, and recording the solution as a solution B; 2-10 ml of the solution B and aluminum salt are weighed and added into the solution A, ultrasonic dispersion is carried out, stirring is carried out for 20-120 min, and a mixed solution is obtained; and transferring the mixed solution into a polytetrafluoroethylene high-pressure reaction kettle, putting the polytetrafluoroethylene high-pressure reaction kettle into a drying oven at 120-180 DEG C, carrying out heating reaction for 10-24 hours, naturally cooling to room temperature, washing the reactant with water and ethanol, centrifuging, and carrying out vacuum drying to obtain the aluminum-doped delta-MnO2 positive electrode material. The positive electrode material is applied to the field of aqueous zinc ion batteries, the specific capacity of the battery positive electrode is extremely high, the battery positive electrode has very excellent cycling stability and high-rate charge-discharge characteristics, and raw materials used for synthesis are non-toxic and low in price.

The invention belongs to the technical field of polyacrylamide synthesis, and particularly relates to a synthesis method of polyacrylamide for oil displacement. The synthesis method of the polyacrylamide for oil displacement, disclosed by the invention, comprises the following steps: (1) pre-emulsifying 1H, 1H, 2H, 2H-perfluorooctyl acrylate; (2) preparing a water phase; (3) preparing an organic phase solution; (4) polymerization reaction; and (5) post-treatment. According to the synthesis method of polyacrylamide for oil displacement, acrylamide is used as a main monomer, 3-allyloxy-2-hydroxy-1-propanesulfonic acid sodium salt, 1H, 1H, 2H, 2H-octyl perfluoroacrylate and 1-methacryloyloxy adamantane are used as functional monomers, a potassium persulfate solution-sodium hydrogen sulfite solution is used as an initiator system, and the polyacrylamide for oil displacement is synthesized through a one-step method. The polyacrylamide for oil displacement, which is prepared by adopting a water-phase micelle polymerization method, has temperature resistance, salt resistance and shear resistance.

The application relates to a compound medicine for delaying skeletal muscle aging and application thereof, and the medicinal active components in the compound medicine composition are composed of menadione bisulfite sodium and N-acetyl cysteine, and belong to the technical field of biological medicine. A novel drug combination mode is developed, an oxidant menadione bisulfite sodium (MBS) and an antioxidant N-acetyl-L-cysteine (NAC) are combined and given in different time periods to regulate the H2O2 circadian rhythm of the skeletal muscle of old mice, the changes of the muscle strength, histopathology and aging marker protein level of the skeletal muscle of the old mice are detected, and then the precise compound medicine capable of improving the skeletal muscle function of the old mice and delaying skeletal muscle aging is determined. The application provides an effective drug combination strategy for relieving or treating the delay of skeletal muscle aging, and has very significant meaning.

The application belongs to the technical field of preparation of thermochromic hydrogel, and discloses a thermochromic hydrogel for shielding ultraviolet and near-infrared light and a preparation method and application thereof. The thermochromic hydrogel is prepared by one-pot low-temperature crosslinking with N-isopropyl acrylamide as a temperature-sensitive matrix, hydroxypropyl methyl cellulose as a modified component, titanium dioxide and cesium tungsten bronze as functional fillers, N, N-methylene bisacrylamide as a crosslinking agent, ammonium persulfate and sodium bisulfite as an initiation system. The thermochromic hydrogel realizes full-band regulation of sunlight by using the ultraviolet shielding of titanium dioxide and the near-infrared heat insulation performance of cesium tungsten bronze. The prepared hydrogel has the characteristics of high visible light transmittance, excellent solar light modulation efficiency and suitable critical transition temperature, and makes up for the defect of insufficient spectral shielding capacity of traditional single PNIPAM hydrogel. The process is mild and simple, the raw materials are cheap and easy to obtain, and the hydrogel is easy to form a film in a large area and to be prepared on a large scale, so the hydrogel can be widely applied to the fields of energy-saving and light-regulating such as intelligent windows of buildings, vehicle-mounted light-regulating glass and the like.

The present application relates to the field of medical hemostatic powder, and specifically discloses an absorbable hemostatic powder and a preparation method thereof. A preparation method of an absorbable hemostatic powder comprises the following steps: S1: adding modified potato starch and hydroxypropyl-β-cyclodextrin to water, gelatinizing at 50-55°C to obtain a homogeneous solution; S2: adding a cross-linking agent to the homogeneous solution, mixing evenly, dropping it into liquid paraffin containing an emulsifier, emulsifying at 55-60°C for 30-40min to obtain an emulsion; S3: adding sodium bisulfite to the emulsion, stirring at 350-380r / min for 2-3h, centrifuging and washing for multiple times to obtain starch / cyclodextrin composite microspheres, i.e., absorbable hemostatic powder; in addition, the preparation method of the present application has the advantage of improving the hemostatic effect of the hemostatic powder.

The invention discloses a reclaimed water reuse process and reclaimed water reuse system aiming at photovoltaic industry wastewater, and the reclaimed water reuse process comprises the following steps: firstly, pumping dilute acid water, dilute alkaline water and concentrated alkaline water into an adjusting tank according to a ratio, adding a reducing agent sodium hydrogen sulfite into the adjusting tank, controlling the ORP (oxidation reduction potential) of the mixed water to be-20-40mV, and controlling the pH value to be 9.0-11.0; mixed water in the adjusting tank is pumped into a reclaimed water recycling device to remove suspended solids, COD and salts, the reclaimed water recycling device comprises a sand filter tank, a carbon filter tank, a precision filter, an ultrafiltration membrane device and a reverse osmosis membrane device which are sequentially connected, produced water of the reverse osmosis membrane device enters a produced water barrel, concentrated water of the ultrafiltration membrane device and concentrated water of the reverse osmosis membrane device enter a concentrated water barrel, and the concentrated water of the ultrafiltration membrane device and the concentrated water of the reverse osmosis membrane device enter the reclaimed water recycling device. The concentrated water in the concentrated water barrel enters the concentrated water treatment unit to be subjected to pH adjustment and defluorination treatment, and finally the concentrated water reaches the standard and is discharged, a large amount of water resources in the photovoltaic industry can be recycled, the water resources are saved, and the system is stable in operation and low in operation cost.

The invention belongs to the technical field of styrene-butadiene latex preparation, and discloses carboxylic styrene-butadiene latex for food paperboard coating and a preparation method of the carboxylic styrene-butadiene latex. The carboxylic butadiene-styrene latex is prepared from the following raw materials in parts by weight: 30 to 45 parts of butadiene, 25 to 40 parts of styrene, 3 to 8 parts of methacrylic acid, 2 to 4 parts of polar crosslinking monomer, 1.5 to 3 parts of alkyl glycoside emulsifier, 0.3 to 0.8 part of ammonium persulfate, 0.1 to 0.4 part of sodium hydrogen sulfite, 0.2 to 0.6 part of chain transfer agent and 80 to 100 parts of deionized water. The alkyl glycoside emulsifier adapts to a mixed monomer system, stabilizes the pre-emulsion and the polymerization process, ensures that the pre-emulsion is not layered in the storage and dropwise adding process, improves the polymerization uniformity of the monomer in the micelle, and further improves the smoothness and glossiness of the coated paper. The raw materials do not contain formaldehyde and nonyl phenol, the VOC content is extremely low, the food contact safety standard is met, meanwhile, the ageing-resistant defect of traditional carboxylic butadiene-styrene latex is overcome, the food packaging and storage period is prolonged, and the environment-friendly carboxylic butadiene-styrene latex can be suitable for various food packaging scenes.

The application relates to the technical field of medical nursing products, in particular to a high-air-permeability and high-moisture-permeability medical pad and a preparation process thereof. The non-woven fabric is immersed in a tannic acid solution to obtain a hydrophilic non-woven fabric; the non-woven fabric is sequentially immersed in a dopamine buffer solution and a mercaptopropyl methyl dimethoxysilane to obtain a modified super-hydrophilic non-woven fabric. A high-water-absorption resin is obtained by adding acrylic acid, a sodium hydroxide solution, trimethylolpropane triacrylate, propylene-modified chitosan antibacterial material, potassium persulfate, sodium bisulfite and sodium dodecyl sulfate; and the high-water-absorption resin is laid and formed to obtain an absorption layer. The absorption layer, the modified super-hydrophilic non-woven fabric and the hydrophilic non-woven fabric are sequentially covered on a barrier layer, and are bonded by hot-melt glue hot pressing to obtain a high-air-permeability and high-moisture-permeability medical pad. The medical pad prepared by the application has high air permeability and moisture permeability and good antibacterial performance, and therefore has a wide application prospect in the technical field of medical nursing products.

The invention provides a synthesis method of an acrylamide-hydroxyethyl methylacrylate binary polymer and application of the acrylamide-hydroxyethyl methylacrylate binary polymer in pyrite beneficiation. The method comprises the following steps: water-phase free radical copolymerization: dissolving acrylamide in deionized water, dropwise adding hydroxyethyl methylacrylate under the protection of an inert atmosphere, heating to 55-65 DEG C, then adding an ammonium persulfate-sodium hydrogen sulfite initiator into a mixed system in batches, carrying out a heat preservation reaction at 55-65 DEG C for 4-6 hours, adjusting the pH value of a product to 6.5-7.5 after the reaction is finished, and carrying out water-phase free radical copolymerization; the binary polymer is obtained. The prepared polymer is used as an inhibitor in ore pulp, when the dosage is 100-500 g / t according to the mass of treated ore and the pH value of the ore pulp is 6-9, the pyrite recovery rate can be effectively reduced, the pyrite removal effect is improved, meanwhile, the influence on target mineral flotation is small, and the method is suitable for industrial production. The method does not need an organic solvent, the condition is mild, the product performance is stable, the repeatability is good, and the method is suitable for industrial preparation and application.

The invention discloses an oral membrane for treating schizophrenia and a preparation method and application thereof, and belongs to the technical field of pharmaceutical preparations. The invention aims to solve the technical problems of low dissolution rate and disintegration speed, difficulty in swallowing, high medicine hiding probability of patients, easiness in variation of medicines, complex composition and preparation process and certain side effects. The technical scheme is as follows: 1) the oral film agent comprises an active drug component lonanserin, a film-forming composition copovidone, polyoxyethylene and sodium hydrogen sulfite and a plasticizer polyethylene glycol, and the oral film agent can be delivered in an amorphous solid dispersion form, so that the oral film agent can maintain a supersaturated state in an intestinal environment, inhibit devitrification and improve the bioavailability of the oral film agent; therefore, more consistent and stable system exposure is obtained; 2) the sodium hydrogen sulfite serving as an antioxidant can reduce impurities in related substances of the blonanserin film agent;

The invention discloses high-molecular-weight polyacrylamide with strong anti-shearing force and large adsorption area, which is prepared from the following components in parts by weight: 90 to 100 parts of acrylamide, 10 to 15 parts of acrylic acid, 15 to 20 parts of 2-acrylamide-2-methylpropanesulfonic acid, 0.01 to 0.03 part of EDTA-2Na (Ethylene Diamine Tetraacetic Acid), 0.1 to 0.3 part of butylated hydroxyanisole, 0.1 to 0.3 part of N, N-dimethylformamide, 0.1 to 0.3 part of N, N-dimethylformamide and the balance of water. The invention discloses a water-based cleaning agent which is prepared from the following components in parts by weight: 0.2 to 0.5 part of N, N '-methylene bisacrylamide, 0.025 to 0.03 part of ammonium persulfate, 0.025 to 0.03 part of sodium hydrogen sulfite, 0.005 to 0.008 part of 2-hydroxyl-4'-(2-hydroxyethoxy)-2-methyl propiophenone and 360 to 375 parts of deionized water. The invention also provides a preparation method and application of the high molecular weight polyacrylamide. The polyacrylamide provided by the invention has strong anti-shearing force and large adsorption area, can more efficiently capture and wrap pollutant particles, and greatly enhances the adsorption capacity and flocculation efficiency of suspended colloids, organic impurities and heavy metal ions.

The invention provides an ambroxterol composition and a preparation process thereof, and particularly relates to the field of medicines. Each milliliter of the liquid preparation comprises 1-2mg of ambroxol hydrochloride, 0.5-1.5 [mu] g of clenbuterol hydrochloride, 10-20mg of sodium hydrogen sulfite, 1-4mg of hydroxyethyl cellulose and purified water. The toothpaste further comprises 243-247 mg of an amorphous sorbitol solution, 3-5 mg of pomegranate essence, 148-152 mg of glycerin, 1-3 mg of sodium benzoate and a proper amount of DL-tartaric acid. According to the preparation disclosed by the invention, the increase of an impurity B can be inhibited by adding sodium hydrogen sulfite, and the increase of an ambroxol impurity 14 and an unknown single impurity can be reduced by reducing the dosage of hydroxyethyl cellulose, so that the drug stability is improved.

The application discloses a tetraphenylstyryl-imidazole pyrazine derivative with AIE properties and application, and has the following structure: 4-(1,2,2-triphenylvinyl) benzaldehyde, 5,6-diaminopyrazine-2,3-dicyan, sodium bisulfite are placed in N,N-dimethylformamide, and are reacted at 150 DEG C for 12h; after reaction, the functional organic material C-1 is obtained through separation and purification. The obtained product C-1, methyl iodide and N,N-diisopropylethylamine are placed in N,N-dimethylformamide, and are reacted at 90 DEG C for 1-2h; after reaction, a tetraphenylstyryl-imidazole pyrazine derivative with AIE properties is obtained. The functional organic material disclosed by the application has the advantages of low preparation cost, simple operation, simple method, and the material shows significant AIE characteristics, and can be applied to technical fields of luminescent materials and inkless writing.

The present invention relates to a degradable polymer thickening agent, which is characterized in that, by weight, it comprises 100-120 parts of acrylamide (AM), 25-30 parts of acrylic acid (AA), 15-20 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), and 0.5-1 part of a functional monomer with degradability (RCS); in the present invention, an oxidation-reduction system is ammonium persulfate-sodium bisulfite, and a water-soluble azo initiator is used as a composite initiator system for the polymerization reaction to carry out aqueous solution homogeneous copolymerization to prepare a degradable polymer thickening agent; the polymer thickening agent provided by the present invention has the characteristics of excellent temperature resistance, shear resistance, viscoelasticity and degradability. It can be widely used in the field of oil production in oil development.

The invention relates to the technical field of coal mine dust prevention and control, in particular to a dual-network interpenetrating structure dust suppression material and a step-by-step polymerization dust suppression method in a coal seam. The dust suppression material is prepared from the following raw material components: hydroxypropyl methyl cellulose, hydroxypropyl acrylate, ammonium persulfate, acrylamide, N, N '-methylene bisacrylamide, sodium hydrogen sulfite, sodium dodecyl benzene sulfonate and deionized water, and the dust suppression material with the dual-network interpenetrating structure comprises a flexible network and a rigid network, the flexible network is a grafted product of hydroxypropyl methyl cellulose and hydroxypropyl acrylate, and the rigid network is polyacrylamide. Amido groups in the rigid network can further improve the adsorbability to dust, meanwhile, the rigid network and the flexible network form a double-network interpenetrating structure, so that the material has high water-retaining property, the double effects of chemical anchoring and physical wrapping on coal are achieved, the dust production rate in the mining process is reduced, dust production is reduced from the source, and the mining efficiency is improved. And long-acting dust suppression is achieved, and dust generated in the coal crushing process is reduced.

The invention relates to the technical field of peptide extraction, in particular to sipunculus nudus peptide and an extraction method and application thereof. According to the specific technical scheme, the method comprises the following steps: 1) crushing a sipunculus nudus raw material, adding water, adding sodium hydrogen sulfite and ascorbic acid, and stirring and soaking for 10-15 minutes; 2) grinding the soaked raw materials, and adjusting the pH value of the slurry to be alkaline; (3) adding alkali enzyme into the slurry, carrying out microwave enzymolysis for 45-50 minutes, adding papaya peptidase B, continuously carrying out microwave enzymolysis for 45-50 minutes, heating, inactivating, cooling, carrying out centrifugal filtration, and collecting filtrate; and 4) sequentially carrying out microfiltration, ultrafiltration and sodium filtration on the obtained filtrate to obtain the product. Microwave radiation is adopted for assisting enzymolysis, energy can be provided for an enzymolysis system, the temperature needed by enzymolysis can be maintained, the enzymolysis efficiency is greatly improved, the prepared sipunculus nudus peptide can stabilize iron ions, a safe and efficient iron supplementing preparation can be developed, meanwhile, reproductive function decline caused by obesity can be comprehensively repaired, the advantage of multi-dimensional conditioning is achieved, and the sipunculus nudus peptide has a good application prospect. And the method is suitable for metabolism-related reproductive disorder treatment.

The invention discloses an organic-inorganic hybrid rheology modifier for deep wells and ultra-deep wells as well as a preparation method and application thereof. The preparation method comprises the following steps: step (1), adding ammonium persulfate into an acrylamide aqueous solution for polymerization reaction to obtain polyacrylamide; (2) preparing a polyacrylamide solution, adding a formaldehyde aqueous solution and a sodium hydrogen sulfite solid, and carrying out a synthetic reaction to obtain sulfomethylated polyacrylamide colloid; step (3), uniformly mixing the sulfomethylated polyacrylamide colloid with N-vinyl caprolactam, and then adding azodiisobutyronitrile to carry out copolymerization reaction, so as to obtain SPAM-NVCL (Sulfonyl Polyacrylamide-NVCL) copolymer powder; and (4) wetting the SPAM-NVCL copolymer powder with a glutaraldehyde aqueous solution, then adding the silica sol nanoparticle dispersion liquid to carry out a curing reaction, and after the curing reaction is finished, carrying out spray drying to obtain the SPAM-NVCL composite material. The rheology modifier can solve the problems of poor high-temperature stability, low rheology regulation and control precision, non-ideal system compatibility and the like when the existing rheology modifier is used for well cementation of deep wells and ultra-deep wells.

The invention relates to the technical field of stem cell treatment, in particular to a pharmaceutical composition for treating urinary incontinence and a preparation method and application thereof. The invention provides a pharmaceutical composition for treating urinary incontinence. The pharmaceutical composition is prepared from the following components: adipose tissue-derived stem cell exosome, platelet-rich plasma, rutin, astragaloside, fructus alpiniae oxyphyllae extract, human serum albumin, sodium hydrogen sulfite, sorbitol and the balance of water for injection. The PRP and the adipose tissue-derived stromal cell exosome are applied to treatment of urethral sphincter injury, clinical application experiments show that the PRP and the adipose tissue-derived stromal cell exosome have a good repairing effect in connective tissue and muscle tissue, symptoms of patients can be greatly improved, the patients can recover more quickly, and the curative effect of the patients on urethral sphincter injury is improved. The urinary incontinence state of a patient can be greatly improved, and a basis is provided for clinical application of a cell technology.

The application provides a film preparation of lumerabenzole or a salt thereof and a preparation method thereof, and relates to the technical field of medicines. According to mass fractions, the film preparation comprises the following raw materials: 2-30 parts of lumerabenzole or a pharmaceutically acceptable salt thereof, 40-95 parts of a film forming material, 1-30 parts of a plasticizer and 0.1-5 parts of an antioxidant. The antioxidant is at least one selected from butylated hydroxyanisole, butylated hydroxytoluene and sodium bisulfite. The film preparation is used for drug delivery through an oral mucosa or a sublingual route, can significantly improve the bioavailability of the drug, increase the blood drug concentration, improve the drug content in the brain and the D2 target point occupancy rate, and can effectively enhance the curative effect.

The invention relates to the technical field of methylation detection, and particularly discloses a plasma sample-based rapid methylation pretreatment kit, which comprises a lysis solution, magnetic beads, a rinsing solution and a conversion solution, the lysis solution is prepared from Tris-HCl, EDTA (Ethylene Diamine Tetraacetic Acid), NaCl, SDS (Sodium Dodecyl Sulfate), guanidine isothiocyanate, sodium acetate, PVP (Polyvinyl Pyrrolidone), PEG200 ( The magnetic beads are polydisperse magnetic microspheres with the particle size of 100-400 nm; the magnetic bead rinsing liquid is an ethanol solution; according to the method, the formula of the extraction reagent is improved, the protease K is successfully removed on the premise that the extraction efficiency is not changed, the specific conversion reagent is adopted, the large volume of the specific conversion reagent serves as the extraction eluent, and conversion can be directly carried out after elution. The innovative design effectively reduces the loss of nucleic acid and obviously improves the detection sensitivity. Meanwhile, the extraction process and the conversion process are integrated, so that the operation steps are greatly simplified, the operation complexity is reduced, and a more efficient and convenient sample pretreatment solution is provided for methylation detection.

The invention provides a method for determining the content of loganic acid in cosmetics, and relates to the technical field of cosmetic analysis. The determination method comprises the following steps: mixing a cosmetic sample with an extraction solvent which is a mixture of methanol, disodium ethylene diamine tetraacetate and sodium hydrogen sulfite, carrying out ultrasonic extraction and separation to obtain a supernatant, and carrying out elution purification and concentration through a solid-phase extraction column to obtain a sample to be detected; preparing a test solution, a standard stock solution and a mixed standard working solution; detecting the test solution by high performance liquid chromatography, drawing a standard curve to obtain a linear regression equation, and determining the content of loganic acid; the efficiency, accuracy, durability and the like of the method for testing the content of loganic acid in cosmetics are remarkably improved through a specific pretreatment method, an extraction solvent, a chromatographic column, the composition and proportion of a mobile phase, gradient elution conditions and the like.

This invention relates to the field of polymer material synthesis technology, specifically disclosing a water-dispersible cationic polyacrylamide material and its preparation method. The material is composed of the following raw materials in parts by weight: 45-50 parts modified acrylamide, 15-20 parts cationic monomer, 5-10 parts N-vinylpyrrolidone, 0.8-1.2 parts surfactant, 90-100 parts deionized water, 0.1-0.5 parts crosslinking agent, 3-8 parts hyperbranched polyester Boltorn (H₂O), 0.08-0.12 parts ammonium persulfate, 0.03-0.05 parts sodium bisulfite, and 0.5-0.8 parts aluminum citrate. The preparation process of this invention is simple and highly operable. The provided polyacrylamide material has a high specific surface area, excellent water dispersibility, good stability, and salt resistance, making it suitable for various industrial applications such as water treatment and papermaking, exhibiting good flocculation performance and reinforcing effects.

The invention discloses a high-elastic breathable antifouling sofa cover and a preparation method thereof, and relates to the technical field of sofa covers. R-3-butene-2-amino alcohol, maleic anhydride, sodium hydrogen sulfite and phosgene are subjected to a reaction to be formed, then grafted to the surface of hemp cotton yarn and polymerized with 4, 6-octadienoic acid and 1, 2-difluoro-3-(propyl-2-ene-1-yl) benzene, a surface hydrophilic and external hydrophobic structure is constructed, the surface energy of the sofa cover is reduced, the water resistance and oil resistance of the sofa cover are improved, and meanwhile the sofa cover has the advantages of being good in water resistance and oil resistance. The anti-static effect is improved, dust adsorption is reduced, complexation with silver ions is achieved, and the anti-fouling effect of the sofa cover is enhanced; 2-aminocaproic acid, 2-amino-3, 5-dimethylbenzoyl chloride, 2-chloroacetyl chloride and dioctyl methylamine are utilized to modify cotton yarns, quinazolinone and quaternary ammonium structures are introduced to the surfaces of fibers to synergistically inhibit the growth of bacteria and improve the antibacterial effect of the sofa cover, then the modified hemp cotton yarns are used as camlet, the modified cotton yarns are used as core yarns, and the sofa cover is prepared by twisting and spinning.

The present invention provides a transparent high-impact heat-resistant MBS resin and a preparation method thereof, which relates to the field of preparation methods of polymer materials and is prepared from the following raw materials: water, ethanol, maleic anhydride, emulsifier, MBS resin graft latex, potassium persulfate, antioxidant; the MBS resin graft latex is prepared from the following raw materials: water, modified styrene-butadiene latex, sodium bisulfite, potassium persulfate, methyl methacrylate and styrene; the modified styrene-butadiene latex is prepared from the following raw materials: pre-emulsion, glycidyl methacrylate, ammonium persulfate, divinylbenzene, potassium persulfate; the pre-emulsion is prepared from the following raw materials: water, emulsifier, butadiene and styrene. The product of the present invention has good heat resistance, good modification effect on PVC, and the modified PVC composite material has high light transmittance, high cantilever beam impact strength and good aging resistance.

The invention discloses polyacrylamide gel, the gel comprises concentrated gel and separation gel, and a gel solution of the concentrated gel comprises a polyacrylamide concentrated gel premixed solution and an initiator; a gel solution of the separation gel comprises a polyacrylamide separation gel premixed solution and an initiator; the polyacrylamide concentrated gel premix solution comprises 4 wt% of a polyacrylamide solution, a Tris-HCl buffer solution, 0.4 wt% of a coagulant and a dye; the polyacrylamide separation gel premix solution comprises 6 wt%-15 wt% of a polyacrylamide solution, a Tris-HCl buffer solution and 1.2 wt% of a coagulant; the coagulant comprises N, N, N ', N'-tetraethylethylenediamine and sodium hydrogen sulfite; the initiator comprises ammonium persulfate. By improving the components and proportion of the coagulant, the gelation time is shortened, and the harm of toxic reagent volatilization to people in the gel preparation process is reduced; meanwhile, by adding a certain proportion of halogenated acetic acid, the observation convenience and the experiment efficiency are improved.

The present invention discloses Process for the preparation of corrugated cardboard glue from avocado seed starch. The process involves the starch extraction from avocado pits [በ ዉ solution of sodium metabisulfite (Na:S:0s) to subdue polyphenol oxidation during the extraction process. Afterwards, 2 L of water were added to the slurry, which was then socked for 24 hours. The residue or the brown milk was placed [በ 8 vacuum oven and dried at 50 for 24 hours. The cardboard glue, Coragum, was formulated from avocado seed starch, caustic soda, and borax. The obtained Coragum glue showed that the low gelation temperature or characterized by high viscosity with the range of 35 to 40 The final product was formulated by mixing starch powder with 5% NaOH and 3% BORAX for commercialization purposes. The binding performance was examined by sticking the three compartments of the cardboard (flute, test liner, and kraft papers) with burst test of 9 Kg Cm-3 and crust of 27 Lb which are equivalent to TAPPI ISO standand methods. These outsanding results paves a way in producing paper based products and packaging soulutions.