64 results about "Pentamine" patented technology

The invention relates to the technical field of plastics, in particular to a high-strength antibacterial plastic packaging bottle and a preparation method thereof.The preparation method comprises the steps that polylactic acid, poly (butylene succinate), epoxidized soybean oil and composite zinc oxide are mixed, extruded, granulated and blow-molded, and a base part is obtained; mesoporous nano-zinc oxide is used as a carrier to carry tea polyphenol, then carboxymethyl chitosan is used for coating, and an epoxy compound containing a Si-O chain segment is grafted; preparing a protective coating from composite zinc oxide and soybean oil-based self-repairing waterborne polyurethane, and coating the surface of a substrate with the protective coating; soybean oil-based polyol, polytetrahydrofuran ether glycol and isophorone diisocyanate are used as raw materials to prepare a polyurethane prepolymer, 2, 2-bis (hydroxymethyl) propionic acid is used as a hydrophilic chain extender, an epoxy compound containing a Si-O chain segment is used as a modifier, 1, 4-butanediol and dithiodiethanol are used as end-capping reagents, triethylamine is used as a neutralizer, and the polyurethane prepolymer is prepared by a one-step method. And ethylene diamine and tetraethylenepentamine are used as amine cross-linking agents to prepare the soybean oil-based self-repairing waterborne polyurethane.

The invention relates to the technical field of building materials, in particular to a flame-retardant water-resistant magnesium oxysulfate board and a manufacturing process thereof. The invention discloses the following scheme: mixing light calcined magnesia powder, magnesium sulfate heptahydrate, water, fly ash, citric acid and iminodiacetic acid type chelate resin to obtain magnesium oxysulfate mixed slurry; the preparation method comprises the following steps: by taking hydrogen-terminated polydimethylsiloxane and 10-undecenal as raw materials, reacting, then grafting 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and then carrying out termination by adopting isophorone diisocyanate, so as to obtain an isocyanate-terminated silicon-containing flame retardant; the preparation method comprises the following steps: modifying epoxy resin by using an isocyanate-terminated silicon-containing flame retardant, and mixing with an epoxy flexibilizer and tetraethylenepentamine to prepare an epoxy resin glue solution; and immersing glass fiber cloth into the epoxy resin glue solution, combining with the magnesium oxysulfate mixed slurry, and curing to obtain the magnesium oxysulfate board. The magnesium oxysulfate board prepared by the invention is high in strength and has good flame retardance and water resistance at the same time.

The invention discloses a preparation method of a carbon dot nano-enzyme, which comprises the following steps: dissolving oxalic acid, polyethyleneimine and ferric nitrate in ultrapure water, heating, mixing and reacting, cooling to room temperature, centrifuging, filtering, dialyzing, and taking supernate to obtain the carbon dot nano-enzyme. The prepared oxalic acid carbon dot nano-enzyme is matched with acetylcholin esterase, acetylcholine, 3, 3 ', 5, 5'-tetramethyl benzidine and H2O2 to construct a colorimetric and fluorescent dual-mode detection method for glyphosate in fruits and vegetables. The oxalic acid carbon dot nano-enzyme is prepared by doping ferric nitrate and tetraethylenepentamine into oxalic acid serving as a precursor, the oxalic acid carbon dot nano-enzyme has excellent peroxidase-like activity, a colorimetric and fluorescent dual-mode detection method of glyphosate is constructed through the oxalic acid carbon dot nano-enzyme, dual-mode detection results can be mutually verified, and the detection result is accurate. And the accuracy and the reliability of a detection result are remarkably improved.

The invention belongs to the technical field of chromatographic filling, and particularly relates to mesoporous silica microspheres, a preparation method and application. According to the preparation method, tetraethylenepentamine functional modified template microspheres and oligomeric silica anions generated by hydrolysis of a silicon source are subjected to an electrostatic anchoring effect, so that self-nucleation of the silicon source is inhibited; the surface of the template microsphere is covered by a lying configuration, so that the steric hindrance is reduced, the diffusion of a silicon precursor in a silicon source solution is promoted, and the yield of the mesoporous silica microsphere is improved; the surface of mesoporous silica is grafted and modified by octadecyl trichlorosilane silicon hydroxyl to form a highly crosslinked Si-O-Si skeleton, so that the mechanical strength of the microspheres is improved, the column efficiency loss is reduced, and the comprehensive yield and performance of high performance liquid chromatography are improved.

The present application relates to a kind of carbon dioxide mineralization method and carbon dioxide mineralization device.The carbon dioxide mineralization method includes the following steps: mixing absorption liquid and industrial solid waste at room temperature, obtain mortar;Make mortar solid-liquid separation, obtain clear liquid and thick slurry;Carbon dioxide in flue gas is absorbed by clear liquid, obtain carbon-rich absorption liquid;Carbon-rich absorption liquid and thick slurry occur mineralization reaction at 180 DEG C-220 DEG C, obtain mineralized slurry;Make mineralized slurry solid-liquid separation, obtain mineralized ash and mineralized clear liquid;Wherein, absorption liquid includes inorganic base and organic base, organic base includes monoethanolamine, diethanolamine, triethanolamine, 3-methylaminopropylamine, N-methyl diethanolamine, piperazine, diethylene triamine, triethylene tetramine, tetraethylene pentamine and 2-amino-2-methyl-1-propanolamine at least two kinds.The method greatly improves CO2 capture rate and CO2 utilization rate, and organic base consumption is less, absorption liquid regeneration energy consumption is low, and overall economy is good.

The invention provides an environment-friendly low-chlorine wet strength agent and a preparation method and application thereof.The preparation method comprises the steps that adipic acid and tetraethylenepentamine are mixed and react for 2-6 h at the temperature of 170-190 DEG C, and a prepolymer is obtained; cooling the prepolymer to 120-140 DEG C, adding a modifier, carrying out a heat preservation reaction for 2-3 h, and adding deionized water to adjust the solid content to 55-65% so as to obtain a modified polyamide solution; adding a cationizing agent and epoxy chloropropane into the modified polyamide solution, heating to 65-75 DEG C, reacting, and adding acid to adjust the pH value to 2.5-4.5 when the viscosity of the system reaches 50-80 mPa.s; adding sodium hydrogen sulfite, and carrying out heat preservation reaction for 1-2 hours; and adding deionized water to adjust the solid content to 12-13%, thereby obtaining the environment-friendly low-chlorine wet strength agent. The specific modifier is adopted to modify a polyamide main chain, and the cationizing agent is introduced, so that the prepared wet strength agent not only can remarkably reduce the content of organic chlorine in a product, but also can improve the dry and wet strength, water resistance and folding resistance of paper. In addition, the product can also shorten the curing time of the paper.

The invention discloses a kind of CO2 responsive type gemini imidazoline surfactant and its application in fracturing fluid, tetraethylene pentamine and long-chain fatty acid are fed, using the dimethylbenzene of mass equal to long-chain fatty acid as water-carrying agent, being warming up to 125~140 DEG C and being refluxed, then continuing to be warming up to 190~220 DEG C and being reversed, being cooled to room temperature successively, obtain gemini imidazoline viscous liquid;Step 2:3 chloro-2 hydroxypropyltrimethylammonium chloride and the composition solution of acetone of equal mass are added dropwise to the gemini imidazoline of step one while stirring, then equimolar acid binding agent is added, reacted at room temperature, being warming up to 56~60 DEG C and distilling out acetone, CO2 responsive type gemini imidazoline surfactant can be obtained.The present invention can be used for the thickening agent of clean fracturing fluid, while improving the viscoelasticity of surfactant as thickening agent for preparing clean fracturing fluid, and the clean fracturing fluid formed is obviously stronger acidic, can dissolve the inorganic blockages such as carbonate rock in partial stratum.

A polymeric adsorbent including a polymer having reacted units of a tetraethylenepentamine (TEPA), reacted units of a 3,5-diacrylamidobenzoic acid, and reacted units of a methacrylamide. The TEPA, the 3,5-diacrylamidobenzoic acid, and the methacrylamide have a molar ratio of 2 to 4:1 to 3:0.5 to 2. Reacted units of the TEPA and reacted units of the 3,5-diacrylamidobenzoic acid are covalently crosslinked, and reacted units of the TEPA and reacted units of the methacrylamide are covalently crosslinked. The polymeric adsorbent of the present disclosure can be used for water treatment.

The invention relates to the technical field of plastics, in particular to a high-strength antibacterial plastic packaging bottle and a preparation method thereof. The invention comprises the following steps: polylactic acid, polybutylene succinate, epoxy soybean oil and composite zinc oxide are mixed, extruded into granules and blow-molded to obtain a base member; tea polyphenols are carried on a carrier of mesoporous nano zinc oxide, which is then coated with carboxymethyl chitosan and grafted with an epoxy compound containing Si-O segments; a protective coating is prepared by using the composite zinc oxide and soybean oil-based self-healing waterborne polyurethane, and the protective coating is coated on the surface of the base member; a polyurethane prepolymer is prepared by using soybean oil-based polyol, polytetramethylene ether glycol and isophorone diisocyanate as raw materials, 2,2-bis(hydroxymethyl)propionic acid is used as a hydrophilic chain extender, the epoxy compound containing Si-O segments is used as a modifier, 1,4-butanediol and dithiodiethanol are used as end-capping agents, triethylamine is used as a neutralizing agent, and ethylenediamine and tetraethylenepentamine are used as amine cross-linking agents to prepare the soybean oil-based self-healing waterborne polyurethane.

The application discloses a preparation method of carbon dot nanometer enzyme, which comprises the following steps: dissolving oxalic acid, polyacetyl imine and ferric nitrate in ultrapure water, heating and mixing, cooling to room temperature, centrifuging, filtering, dialyzing and taking supernatant to obtain the carbon dot nanometer enzyme; and a double-mode detection method for colorimetric and fluorescent detection of glyphosate in fruits and vegetables is constructed by using the prepared oxalic acid carbon dot nanometer enzyme, acetylcholinesterase, acetylcholine, 3,3',5,5'-tetramethyl benzidine and H2O2. The oxalic acid carbon dot nanometer enzyme is prepared by doping ferric nitrate and tetraethylenepentamine with oxalic acid as a precursor, has excellent peroxidase-like activity, and a colorimetric and fluorescent double-mode detection method for glyphosate is constructed by using the oxalic acid carbon dot nanometer enzyme, the double-mode detection results can be verified with each other, and the accuracy and reliability of the detection results are significantly improved.

A method of cleaning a fouled reverse osmosis (RO) membrane using a comb-shaped polymer which includes dissolving the comb-shaped polymer and a base in water to form a solution, contacting the fouled RO membrane with the solution to produce a cleaned RO membrane. The comb-shaped polymer includes reacted units of poly(isobutylene-alt-maleic anhydride) and an oligoethylene amine where, the oligoethylene amine is triethylenetetramine, tetraethylene pentaamine, or pentaethylenehexamine.

The invention discloses a TEPA modified bimetallic MOF material for CO2 adsorption and a preparation method of the TEPA modified bimetallic MOF material, and belongs to the technical field of CO2 adsorption. The preparation method comprises the following steps: firstly, by virtue of a solvothermal method, taking zinc nitrate hexahydrate and magnesium nitrate hexahydrate as bimetallic sources, and reacting with an organic ligand 2, 5-dihydroxy terephthalic acid, so as to prepare Zn-Mg bimetallic MOF-74; and then grafting tetraethylenepentamine to the skeleton of the bimetallic MOF-74 in an inert atmosphere by adopting a post-synthesis grafting method. The chemical adsorption site of TEPA is combined with the physical adsorption framework of Zn-Mg bimetal MOF-74, the regulation and control effect of bimetal on the pore structure and rich amino functional groups introduced by TEPA are utilized, the CO2 adsorption capacity, the amine efficiency and the cycle stability are improved, and the preparation method is mild in condition, simple in process, easy to expand and suitable for industrial production. The method has a wide application prospect in the fields of industrial flue gas CO2 capture and the like.

The present invention discloses a naphthalene dianhydride molecular compound and its preparation and application. The chemical structural formula of the novel naphthalene dianhydride molecular compound is shown in formula (1). The preparation thereof is specifically to carry out an alkylation reaction with pentylamine under the catalysis of phosphorus tribromide to prepare an intermediate product A; to carry out a cyclization reaction by replacing the bromine atoms on one side of the intermediate product A with 1,5-diaminonaphthalene to obtain an intermediate product B; to replace the bromine atoms on the remaining side of the intermediate product B with 2-aminothiophenol, and to obtain a novel naphthalene dianhydride molecule after cyclization. The preparation process of the nanoparticles is to take the novel naphthalene dianhydride molecule, dissolve it in a DMSO solvent, and then drop DSPE-PEG 2000 After coating, DMSO is removed by rotary evaporation, and the nanoparticles are uniformly dispersed in a pure aqueous solution. The present invention can effectively improve the deficiencies of the prior art, including enhancing the ultraviolet absorption of the second near-infrared window, improving the photothermal conversion rate of naphthalene dianhydride molecules, and achieving effective killing of tumor cells. #imgabs0#

The invention discloses oxidation-crosslinking modified starch with retrogradation resistance, a preparation method and application in PBAT (poly (butyleneadipate-co-terephthalate)). The preparation method of the oxidation-crosslinking modified starch comprises the following steps: S1, dissolving starch in water to prepare starch milk, adding a Dess-Martin oxidizing agent into the starch milk, and washing and drying a product to obtain oxidized starch; s2, dissolving tetraethylenepentamine and glycerol triglycidyl ether in dimethyl sulfoxide, and heating at a constant temperature to synthesize a cross-linking agent; and S3, uniformly mixing the oxidized starch, a cross-linking agent and a plasticizer in a high-speed mixer, and extruding through double screws to obtain the oxidized-cross-linked modified starch. The cross-linking agent with cross-linking and plasticizing functions is synthesized, and the cross-linking agent can improve the cross-linking efficiency and form stable hydrogen-bond interaction, so that starch retrogradation is inhibited. In addition, the oxidized starch and the cross-linking agent are subjected to a Schiff base reaction, so that a dynamic cross-linked network is formed in starch molecules, and the thermal stability of the starch can be improved.

The invention relates to the technical field of adhesives, and mainly relates to a low-temperature high-modulus two-component adhesive as well as a preparation method and a use method thereof. The low-temperature high-modulus double-component adhesive is prepared from a component A and a component B. The component A is prepared from, by mass, 20%-30% of aromatic epoxy resin, 10%-20% of bisphenol A type epoxy resin, 40%-50% of fumed silica, 5%-15% of nanometer aluminum oxide, 0.1% of a defoaming agent and 0.5% of a coupling agent. The component B is prepared from the following components in percentage by mass: 40 to 50 percent of DDM, 10 to 20 percent of isophorone diamine, 5 to 15 percent of tetraethylenepentamine, 20 to 30 percent of fumed silica and 5 to 15 percent of glass fiber powder. The adhesive provided by the invention has high hardness and high compressive elastic modulus after being cured, and can maintain relatively high bonding strength under a low-temperature condition, so that the problem that a traditional adhesive is easy to brittle and crack under a low-temperature load is effectively solved. And the adhesive is simple and efficient in material selection, low in cost, free of solvent, green and environment-friendly, and can be widely applied to automobiles, airplanes and ships.

The present application relates to a kind of transparent flame-retardant coating compound and its preparation method and application, the structural formula of the compound is as shown below: preparation method includes with diphenyl phosphor chloride (DPPC), tetraethylenepentamine (TEPA), ladder epoxy polysiloxane (AEOS) as raw material, by two-step method polymerization is obtained.The transparent flame-retardant coating compound of the present application is used for polycarbonate coating, with the characteristics of strong adhesion, high surface hardness, excellent transparency and flame-retardant performance, has good market application prospect.

The invention relates to the field of polyacrylamide, in particular to functionalized polyacrylamide for aluminum oxide production and a preparation method of the functionalized polyacrylamide, and the functionalized polyacrylamide is a polymer obtained by copolymerization of an acrylamide structural monomer, an anionic structural monomer and a multi-amino monomer. The polyamino monomer accounts for 15-25% of the total mass of the polymerization unit; the anionic structure monomer accounts for 60-75% of the total mass of the polymerization unit; wherein the synthesis of the polyamido monomer comprises the following steps: dissolving acryloyl chloride, biguanide or tetraethylenepentamine in a mixed solution of acetone and triethylamine, and reacting at 25 DEG C for 1-5 hours; and distilling reactants to remove the solvent and unreacted monomers. Polymeric monomers containing polyamine groups enter a polyacrylamide main chain through free radical polymerization copolymerization, electropositive nitrogen atoms on the polyamine monomers and F <-> form polydentate hydrogen bonds, fluorine elements can be effectively enriched on a polymer chain, the polyamine monomers serve as a flocculating agent, meanwhile, the fluorine content in wastewater is reduced, and the effect that one agent has multiple effects is achieved; and the defluorination section in the later process is simplified.

This invention provides an energy-storing, luminescent phase-change hot-melt road marking material and its preparation method, made from the following raw materials: C5 petroleum resin, glass microspheres, silane coupling agent, polyoxymethylene, polyoxyethylene, sodium sulfate, multi-walled carbon nanotubes, expanded graphite, oligomeric dopamine, isophorone diisocyanate, tetraethylenepentamine, perhydropolysilazane, N,N,N',N'-tetramethylbenzidine, 2,8-bis(diphenylphospho)dibenzo[b,d]thiophene, silica aerogel powder, nano-titanium dioxide powder, calcium carbonate powder, barite powder, lauric acid, palmitic acid, hexadecyltrimethylammonium bromide, polyethylene glycol octylphenyl ether, dioctyl phthalate, and acetic acid. While ensuring the visibility and durability of the road markings, this invention reduces high-temperature deformation and low-temperature cracking of the hot-melt road markings, minimizes the propagation of internal cracks, increases the service life of the hot-melt road markings, and reduces maintenance and repainting costs.

The present invention relates to the field of building materials technology, in particular to a kind of flame retardant and water-resistant magnesium oxysulfate board and its manufacturing process. The present invention discloses the following scheme: light-burned magnesium oxide powder, magnesium sulfate heptahydrate, water, fly ash, citric acid, iminodiacetic acid type chelating resin are mixed to obtain magnesium oxysulfate mixed slurry; using hydrogen-terminated polydimethylsiloxane and 10-undecenal as raw materials, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is grafted after the reaction, and then isophorone diisocyanate is used for end-blocking to obtain an isocyanate-terminated silicon-containing flame retardant; the isocyanate-terminated silicon-containing flame retardant is used for modified epoxy resin, and is mixed with epoxy toughening agent and tetraethylene pentamine to prepare epoxy resin glue; glass fiber cloth is immersed in epoxy resin glue, then combined with magnesium oxysulfate mixed slurry, and solidified to obtain magnesium oxysulfate board. The magnesium oxysulfate board prepared by the present invention has high strength and good flame retardancy and water resistance.

This invention relates to the field of wet-process phosphoric acid separation and purification technology, specifically disclosing a phosphoric acid extraction apparatus and method based on tetraethylenepentamine. The apparatus includes a reaction tower, a waste liquid diversion system, a TEPA solution diversion system, and a concentration tank. The waste liquid diversion system includes a waste liquid tank for storing phosphoric acid waste liquid to be treated, a heating pipe installed in the tank, a waste liquid pump connected to the waste liquid tank, and a waste liquid main pipe connected to the pump outlet. The TEPA solution diversion system includes a TEPA solution tank for storing tetraethylenepentamine solution, a TEPA solution pump connected to the tank, and a TEPA solution main pipe connected to the pump outlet. The waste liquid main pipe and the TEPA solution main pipe are respectively connected to the reaction tower. The concentration tank is connected to the bottom of the reaction tower through a guide pipe and is used to receive and concentrate the phosphoric acid solution from which metal ions have been removed. This apparatus, through its integrated diversion and reaction structure, achieves efficient complexation removal of metal ions from low-concentration impurity-containing phosphoric acid waste liquid and continuous recovery of phosphoric acid, and has the advantages of compact process, simple operation, and high extraction efficiency.

The application relates to the technical field of printing and dyeing fixing agents, and particularly discloses a formaldehyde-free fixing agent and a preparation method thereof. The formaldehyde-free fixing agent is prepared from raw materials in the following proportions by weight: dimethyl diallyl ammonium chloride 81-162 parts; acrylamide 9-18 parts; ammonium persulfate 5-7 parts; epichlorohydrin 55-105 parts; tetraethylenepentamine 9-18 parts; triethylamine 4.5-9 parts; dimethylamine 9-18 parts; water 90-120 parts; triallylamine 0.5-1 part; the dimethyl diallyl ammonium chloride, the acrylamide, the ammonium persulfate and the epichlorohydrin are used for preparing product A; the tetraethylenepentamine, the triethylamine, the dimethylamine and the epichlorohydrin are used for preparing product B; the product A, the product B, the water and the triallylamine are mixed to obtain the formaldehyde-free fixing agent. The formaldehyde-free fixing agent of the application can balance the permeability and the reaction film-forming property after application, and has excellent fixing performance.

The invention belongs to the technical field of curing agent preparation, and particularly relates to a normal-temperature rapid curing agent, a synthesis method and application. Tetraethylenepentamine is modified through thiourea, thiourea groups are introduced while the excellent performance of tetraethylenepentamine is reserved, the curing rate of tetraethylenepentamine at the normal temperature can be greatly increased, and the irritation of tetraethylenepentamine is reduced. The prepared modified amine curing agent is simple in preparation process, high in operability and beneficial to industrialization, no solvent is used, no pungent smell exists, and the environment-friendly requirement is met; the prepared adhesive is high in curing rate at normal temperature, high in bonding strength and good in mechanical property.

The invention relates to the technical field of oil field demulsifiers, and particularly discloses a demulsifier for high-viscosity and high-wax-content shale oil and a preparation method of the demulsifier, and the demulsifier for the high-viscosity and high-wax-content shale oil comprises a modified tetrablock phenolic resin demulsifier and a modified phosphate demulsifier in a mass ratio of (3-5): 1; wherein the modified tetra-block phenolic resin demulsifier is a modified tetra-block phenolic resin demulsifier generated by carrying out polymerization reaction on a phenolic resin polyethylene polyamine polymer, ethylene oxide and epoxypropane; the modified phosphate ester type demulsifying agent is a seven-block polyether phosphate ester type demulsifying agent. According to the invention, a slightly oil-soluble demulsifier taking a phenolic resin tetraethylenepentamine polymer as an initiator is compounded with a modified phosphate type slightly oil-soluble demulsifier, and the slightly oil-soluble modified phosphate type demulsifier and the slightly oil-soluble demulsifier taking the phenolic resin tetraethylenepentamine polymer as the initiator are compounded in a multi-series and multi-proportion manner; the invention relates to a dehydration agent specially aiming at shale oil produced liquid treatment.

The present disclosure provides a filtration membrane. The filtration membrane includes a thermoplastic substrate, a first layer comprising a polysulfone, a polyvinylpyrrolidone, and a pentaamine, and a second layer comprising the pentaamine and reacted units of a phthaloyl chloride cross-linked to form a polyamide. A method of preparing the filtration membrane by impregnating pentaamine in an ultrafiltration support matrix for rapidly fabricating a hyper-cross-linked polyamide membrane is also disclosed. The membrane prepared by the method of present disclosure can be used for organic solvent nanofiltration (OSN).

The invention discloses a nanoparticle enhanced functionalized ionic liquid liquid-liquid phase change absorbent as well as a preparation method and application thereof. The absorbent is prepared from functionalized ionic liquid, nanoparticles, a phase change accelerant and a solvent, the molar concentration of the functionalized ionic liquid is 0.05 to 0.35 mol.kg <-1 >; the mass concentration of the nano particles is 0.05 to 0.45 weight percent; the mass ratio of the phase change accelerant to the solvent is (3: 7)-(8: 2); the functionalized ionic liquid is [tetraethylenepentamine] [1, 2, 3-triazole]; the nanoparticles are titanium dioxide; the phase change accelerant is 1-methoxy-2-propyl alcohol; the solvent is water. The absorbent disclosed by the invention shows ideal carbon dioxide trapping performance such as high cycle capacity, low regeneration energy consumption, moderate rich phase volume, low rich phase viscosity, phase change capability in long-term cycle use, high phase separation rate, stable and clear phase interface, high thermal-dynamic performance and the like.

This invention discloses a hyperbranched polyamide modifier, a modified melamine-formaldehyde resin, and their applications, belonging to the technical field of melamine-formaldehyde resin modification. The modifier is prepared from tetraethylenepentamine, ethylenediaminetetraacetic acid (EDTA), a catalyst, and water; the molar ratio of tetraethylenepentamine to EDTA is 1:(0.3-1); the amount of catalyst is 0.5-1.5 wt% of the total mass of tetraethylenepentamine and EDTA. The hyperbranched polyamide modifier prepared by this invention is compatible with melamine-formaldehyde resin, improving toughness and appropriately reducing formaldehyde release.

The invention discloses preparation of a high-performance micro-emulsion cutting fluid which is composed of the following raw materials in parts by weight: 40-50 parts of a base oil component, 1-3 parts of an antirust agent component, 0.8-1.2 parts of a lubricating component, 2-4 parts of a bactericide component, 15-20 parts of a functional additive component and a proper amount of deionized water. The micro-emulsified cutting fluid has the advantages that the micro-emulsified cutting fluid is prepared from base oil, the base oil is matched with conventional anti-rust agent components such as a carboxylate anti-rust agent for joint rust prevention, meanwhile, a small amount of self-made antifriction agent-tetraethylenepentamine oleic acid diamide is added, and a compatible bactericide and a functional aid are dissolved in the base oil, so that the uniform and stable micro-emulsified cutting fluid is obtained; meanwhile, in the metal machining process, heat of a cutter can be rapidly replaced, abrasion of the cutter is reduced, and the self-made oleic acid-tetraethylene amide friction modifier has the effects of reducing the friction coefficient and improving the lubricating performance on the cutting fluid.

The invention relates to a halogen-free flame-retardant polyamide material for a low-voltage circuit breaker shell, and the halogen-free flame-retardant polyamide material for the low-voltage circuit breaker shell comprises the following components in parts by mass: polyamide, star polyamide, modified glass fiber, montmorillonite, a halogen-free flame retardant and an auxiliary agent, the hyperbranched polyamide derivative has a plurality of amino end groups; the modified glass fibers are glass fibers modified by gluconic acid. According to the preparation method, tetraethylenepentamine and acrylate are mixed for free radical polymerization, so that hyperbranched-structure star-shaped polyamide containing a large number of amino groups is obtained; meanwhile, gluconic acid is adopted to treat the glass fibers, and gluconic acid is introduced into the modified glass fibers, so that on one hand, the compatibility between the glass fibers and montmorillonite, polyamide and the like is improved, and the modified glass fibers are combined with other components more tightly;

The invention discloses a preparation method and application of a low-silicon SAPO-34 molecular sieve. Comprising the following steps: mixing an aluminum source, a phosphorus source, a silicon source, a template agent R1, a template agent R2 and water to obtain initial gel, wherein the molar ratio of Al2O3 to P2O5 to SiO2 to R1 to R2 to H2O in the initial gel is 1.0: (0.5-3.0): (0.01-0.3): (0.5-8.0): (0.01-2.0): (20-200); r1 is at least one of diethylamine, triethylamine, di-n-propylamine, diisopropylamine, n-butylamine, morpholine, cyclohexylamine, piperazine and tetraethylammonium hydroxide; r2 is at least one of diethylenetriamine, triethylene tetramine, tetraethylenepentamine, pentaethylenehexamine and polyethylene polyamine; heating and crystallizing the initial gel under a closed condition to obtain a crystallized product; and separating and drying the crystallized product to obtain the molecular sieve. The method is simple in process, good in repeatability and beneficial to large-scale industrial production.

This invention belongs to the field of polymer separation membrane technology for water treatment, specifically relating to an acid-resistant positively charged nanofiltration composite membrane and its preparation method. A polysulfone ultrafiltration membrane is immersed in an aqueous solution containing polyamines and urea compounds, and after standing, excess aqueous phase is removed. Then, it is coated with an oil solution containing polyacrylamide chlorides, and after standing, dried. The resulting membrane is immersed in a coating solution, stood, rinsed, and then dried to obtain the nanofiltration membrane. The total mass concentration of the polyamines and urea compounds is 1%–4%, and the polyamines are one or more of diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and polyethyleneimine, with a mass concentration of 0.9%–3.9%. The urea compounds are one or more of methanesulfonylbicyclourea, 4-chlorophenylurea, 1,3-bis(4-chlorophenyl)thiourea, and benzylthiourea, with a mass concentration of 0.1%–1%. This nanofiltration membrane exhibits excellent acid resistance and salt separation effect, making it suitable for industrial applications, especially lithium extraction from acidic salt solutions, and has high practical value.