237results about How to "Promote polymerization" patented technology

Biodegradable coatings and articles that include natural biodegradable polysaccharides are described. The coatings and articles are formed from a plurality of natural biodegradable polysaccharides having pendent coupling groups.

In vivo formed matrices including natural biodegradable polysaccharides are described. The matrix is formed from a plurality of natural biodegradable polysaccharides having pendent coupling groups. The matrix can also include a bioactive agent which can be released to provide a therapeutic effect to a patient.

The invention discloses an ultra-thin polyester double-sided adhesive tape comprising a polyester thin film layer and two glue layers formed by glue coated on front and back sides of the polyester thin film. The thickness of the polyester thin film is 0.001-0.0012mm. The thickness of the glue layer is 0.002mm. Therefore, the thickness of the double-sided adhesive tape is only 0.005mm, such that electronic product development trends of thin and light can be satisfied. The total thickness of adhesive is 0.004mm, such that the tape has ultra-low thermal resistance, and heat generated by electrical components can be conducted in time. Therefore, electrical component damage caused by long-term working under high temperature is avoided. Also, the invention discloses a formula for the glue used in the ultra-thin polyester double-sided adhesive tape. The glue comprises the raw materials of, by weight, 100 parts of acrylate prepolymer resin, 0.5-3 parts of a curing agent, and 100-200 parts of ethyl acetate. With the glue, a single side thickness is 0.002mm, and high adhesive performance can be provided.

The invention provides a profile control and water plugging agent for an oil field. The profile control and water plugging agent contains polymerizable polymer monomers, lignosulfonate and initiators, wherein the initiators are preserved independent from the polymerizable polymer monomers and the lignosulfonate. The invention further provides a profile control and water plugging method for the oil field. The profile control and water plugging method comprises the following steps of: injecting the polymerizable polymer monomers, the lignosulfonate and the initiators into a ground layer required to be subjected to profile control and water plugging, and carrying out a polymerization reaction under the ground layer temperature. With the adoption of the profile control and water plugging method and the profile control and water plugging agent, a relatively good profile control and water plugging effect can be achieved.

The invention provides a preparation method of acrylic resin used for high-solid-content stoving varnish. The acrylic resin includes, by weight, 18-22% of a solvent, 0.2-2% of a carboxyl monomer, 10-30% of a hard monomer, 15-35% of a soft monomer, 5-10% of a hydroxyl acrylic monomer, 10-20% of glycidyl tertiary carboxylic ester and 2-8% of an initiator. The acrylic resin is more than 80% in solid content, is low in viscosity and is concentrated in molecular weight distribution. In application of spray coating on automobiles, the acrylic resin is free of addition of a solvent for dilution, is low in VOC content which satisfies national standard of emission standard of VOC content in coatings and has wide application in the field of automobile spray coating.

The invention provides a method for preparing conductive polysaccharide composite hydrogel by adopting front-end polymerization of a polysaccharide eutectic solvent mixture solution. The method comprises the following steps of: mixing a polymerizable hydrogen bond donor, a non-polymerizable hydrogen bond donor and a hydrogen bond acceptor according to a certain proportion, stirring and heating until a clear eutectic solvent liquid is formed; then adding polysaccharide solid powder, fully stirring, and standing; dissolving or dispersing a cross-linking agent and an initiator in the mixture to form a polymerizable cross-linked polysaccharide eutectic solvent liquid mixture solution; and transferring the mixture solution into a test tube, heating at the upper end of the test tube by adopting a heat source at room temperature to initiate polymerization reaction, and finally obtaining the conductive polysaccharide composite hydrogel. The deep eutectic solvent chemistry and the front-end polymerization technology are combined, one-step rapid preparation of the conductive polysaccharide composite hydrogel is achieved, and the prepared conductive polysaccharide composite hydrogel has high conductivity and compressive strength and has a wide application prospect in the field of flexible electronic materials.

The invention discloses a synthesis of Li twice battery organic free radical polymer PTMA polar material and application, which comprises the following steps: choosing HTMP and MMA as forerunner; adopting optimum ester interchange synthesized method; preparing MTMP; choosing eldopaque or metal copper as inhibitor; choosing metallic sodium or magnesium methylate as accelerant; preparing MTMP; using MTMP as monomer; choosing AIBN trigger; polymerizing through free radical body in toluene solution; preparing polymer PMTMP; using Na2WO4-H2O2-EDTA as oxidant in the methanol solution; getting PTMA with side chain as nitrogen oxygen stabilizing free radical. This invention can eliminate safe hidden danger of temperature increment, which possesses good electrolytic solution mutual dissolving property.

The present invention relates to a process for improving the copolymerization of ethylene and olefinic comonomers, preferably hexene, in a polymerization loop reactor, characterized in that the process comprises the steps of controlling the comonomer/monomer ratio along the path of the reactor, and in particular This is controlled by multiple, spatially separated monomer feeds along the path of the loop reactor. In another aspect, the present invention relates to a polymerization loop reactor suitable for the copolymerization process of ethylene and an olefin comonomer, preferably hexene.

The invention provides a polyamide reverse osmosis membrane and a preparation method thereof. The membrane comprises a porous support membrane and a carbon quantum dot-containing polyamide layer growing on the surface of the porous support membrane, and the carbon quantum dot-containing polyamide layer comprises the following raw material components: aminated carbon quantum dots, an oil-phase reaction monomer, an oil-phase solvent, an acid acceptor, a pH regulator and a surfactant; the preparation method comprises the following steps: 1, preparing aminated carbon quantum dots; and 2, preparingthe polyamide reverse osmosis membrane. According to the polyamide reverse osmosis membrane disclosed by the invention, the aminated carbon quantum dots are used as a novel water-phase reaction monomer, and a polyamide layer structure containing the carbon quantum dots is formed on the polysulfone porous support membrane by directly carrying out a cross-linking reaction on amino groups on the aminated carbon quantum dots and trimesoyl chloride, so that the water flux can be improved from multiple aspects.

The invention discloses a preparation method of bisphenol A-type cyanate ester resin prepolymer. A bisphenol A-type cyanate ester monomer is taken as a main material and polyphenyl ether is taken as an auxiliary material. The preparation method comprises the following processes of: heating and fusing 100 parts by weight of bisphenol A-type cyanate ester monomer at 110-170 DEG C, adding 0.05-5 parts by weight of polyphenyl ether, continuing to carry out thermal reaction for 1-10 hours under the condition of keeping agitation, and cooling and finishing the reaction when a refraction coefficient of a system achieves 1.583-1.589; and adding 30-50 parts by weight of butanone into the polymer when the temperature is reduced to 70-80 DEG C, evenly agitating and then cooling to room temperature so as to obtain the bisphenol A-type cyanate ester resin prepolymer. A new preparation method of the bisphenol A-type cyanate ester resin prepolymer is developed by the invention, the prepared prepolymer product is good in solubility and long in storage period, and excellent performance of solid cyanate ester is kept.

The invention relates to a preparation method of a polycarboxylate superplasticizer, belonging to the technical fields of building materials and cement concrete admixtures. The polycarboxylate superplasticizer is prepared by taking methylallyl polyethylene glycol and acrylamide as reaction monomers and sodium dodecyl sulfonate as a surface absorption activator, adding a chain transfer agent and an initiator, and finally, regulating the PH value to 6-7 by using an alkaline solution. The polycarboxylate superplasticizer is high in yield and good in performance; and due to the addition of sodium dodecyl sulfonate, the saturation rate of charges adsorbed by particles on a concrete surface can be increased, the flowability of cement in concrete stirring can be improved, the stirring time can be shortened, the efficiency can be increased, and an anti-adhesion effect is better taken. The polycarboxylate superplasticizer is simple in preparation process, low in cost, high in water reducing efficiency, good in cement and concrete compatibility and capable of effectively improving the flowability, slump constant, superstrength and durability of concrete.

The invention discloses a method for synthesizing a polyepoxysuecinic acid salt, which is characterized by comprising the following steps of: dissolving maleic anhydride in deionized water; adding a solution of sodium hydroxide at 30 to 60 DEG C with stirring; adding sodium tungstate and hydrogen peroxide when the temperature is controlled to be between 60 to 100 DEG C; adjusting the pH value to 5 to 7 for reaction for 2 to 100 hours; cooling the reaction solution to below 20 DEG C; adding a precipitator, mixing and stirring the precipitator and the solution; performing suction filtration, adding water into filtrate obtained after suction filtration; keeping the pH value between 6 and 7; heating the filtrate added with water to 70 to 100 DEG C to obtain an epoxysuecinic acid salt; preparing a 0.2 to 4.0 mol/L aqueous solution of the epoxysuecinic acid salt; adding calcium hydroxide and a polymerization promoter into the aqueous solution for performing polymerization reaction till liquid turns yellowish and pasty; and cooling the yellowish and pasty liquid to room temperature to obtain the polyepoxysuccinic acid salt. The method has the advantages of good product quality, low raw material cost and product scale inhibition performance advantageous over that of the prior art.

The invention relates to a method for preparing cationic polyacrylamide through a photo-initiating system. The method comprises the following steps of sequentially adding deionized water, acrylamide monomer, cationic monomer and cosolvent into a quartz reaction device until the materials are completely dissolved; adjusting a pH value of a solution; sequentially adding an azo initiator and a redox initiator into the reaction device while introducing high-purity nitrogen; sealing the reaction device and then putting the reaction device on an ultrasonicscope to be evenly oscillated; putting the reaction device on a rotary disk which rotates at a constant speed; utilizing a control method of low light intensity at first and then high light intensity to react; curing, washing, refining, drying and grinding generated polyacrylamide colloid to obtain a final product. The method can keep a certain concentration of free radicals in a reaction system and guarantees that chain growth proceeds evenly and orderly; the prepared polyacrylamide has good solubility and good flocculating performance; furthermore, an ultraviolet photo-initiating method has the advantages of low production energy consumption, high production efficiency, simpleness to operate, easiness to control and the like; the method disclosed by the invention has a good market application prospect.

The invention relates to a device for taking out and analysing a sample from a polymerisation reactor comprising one or more sample conduits (2), for taking a sample out of said reactor and for conducting said sample to one or more sample flash tanks (3), whereby said conduits each are in communication with said reactor (19) and each are provided with at least two sampling valves (4, 5); comprising one or more sample flash tanks (3), for separating said solid particles and evaporated gas, whereby said sample flash tanks are connected to said conduits (2) and provided with means for analysing said evaporated gas (7), and comprising one or more sample receivers (6), for purifying said solid particles, whereby said receivers are connected to said sample flash tanks (3) and provided with means (8) for analysing said solid particles. The invention further relates to a method for improving a polymerisation reaction in a polymerisation reactor.

The invention provides a resin adhesive and a preparation method thereof. The resin adhesive is prepared from the following raw materials in percentages by weight: 30-50% of a formaldehyde solution, 10-25% of phenol, 10-20% of melamine-modified polyhydroxymethyl urea, 20-40% of lignin, 5-10% of a polyaldehyde cross-linking agent and 3-6% of a composite catalyst, wherein the mass concentration of the formaldehyde solution is 35-40%; and the composite catalyst comprises a mixture of one of zinc oxide, magnesium oxide, calcium hydroxide, barium hydroxide, potassium hydroxide and potassium carbonate, and sodium hydroxide. With the melamine-modified polyhydroxymethyl urea as the raw material, the storage stability of methylol urea is improved, the storage period of the resin adhesive is prolonged, the polymerization reaction of an ortho-response point with relatively poor activity in a phenol structure in the lignin is directionally promoted by the composite catalyst, and low-temperature fast solidification of the resin adhesive is achieved.

The invention discloses a preparation method and application of a polymeric phosphato aluminum iron chloride coagulant under a micro-wave irradiation condition. The method comprises the steps of: based on aluminum polychloride and FeCl3.6H2O as main materials, adding water to dissolve and evenly mixing; then adding disodium hydrogen phosphate solution to adjust the molar ratio of phosphorus to ferro-aluminum; putting into a microwave reactor to radiate and heat, so as to polymerize under a microwave condition; taking out from the microwave reactor; adding NaOH solution to adjust the alkalization degree and continuing to react for a period of time under the condition of a water bath; and finally curing at normal temperature to obtain polymeric phosphato aluminum iron chloride. The prepared polymeric phosphato aluminum iron chloride coagulant can be widely applied to treatment of source water, and treatment of industrial wastewater and domestic wastewater; and the function is superior to that of common aluminum polychloride and ferric polychloride. The polymeric phosphato aluminum iron chloride disclosed by the invention can effectively reduce the turbidity and UV254 of a water body in feedwater treatment; and the polymeric phosphato aluminum chloride iron disclosed by the invention has good removal effect on the turbidity, chemical oxygen demand (COD) and total phosphorus in domestic wastewater and industrial wastewater.

A complex of formula (I) wherein M is zirconium or hafnium; each X independently is a sigma ligand; L is a divalent bridge selected from —R′₂C—, —R′₂C—CR′₂—, —R′₂Si—, —R′₂Si—SiR′₂—, —R′₂Ge—, wherein each R′ is independently a hydrogen atom or a C₁-C₂₀-hydrocarbyl group optionally containing one or more silicon atoms or heteroatoms of Group 14-16 of the periodic table or fluorine atoms, and optionally two R′ groups taken together can form a ring; R² and R^2′ are each independently a C₁-C₂₀ hydrocarbyl group, —OC_1-hydrocarbyl group or —SC_1-20 hydrocarbyl group; R⁵ is a —OC_1-20 hydrocarbyl group or —SC_1-20 hydrocarbyl group, said R⁵ group being optionally substituted by one or more halo groups; R^5′ is hydrogen or a C_1-20 hydrocarbyl group; —OC_1-20 hydrocarbyl group or —SC_1-20 hydrocarbyl group; said C_1-20 hydrocarbyl group being optionally substituted by one or more halo groups; R⁶ and R^6′ are each independently a C_1-20 hydrocarbyl group; —C_1-20 hydrocarbyl group or —SC_1-20 hydrocarbyl group; each R¹ and R^1′ are independently —CH₂R^x wherein R^x are each independently H, or a C_1-20 hydrocarbyl group, optionally containing heteroatoms.

The invention provides a biologic polycarbonate and a preparation method thereof. The biologic polycarbonate is obtained by polymerizing biologic epoxy fatty acid ester serving as a raw material and CO2 gas, the yield is more than or equal to 70 percent, the number-average molecular weight is 11,000 to 30,000, and the molecular weight distribution is 1.10 to 1.74; and the biologic epoxy fatty acid ester is obtained by hydrolyzing, freezing and separating unsaturated fatty acid ester from natural vegetable fat and then performing epoxidation, or obtained by direct epoxidation of the natural vegetable fat. The renewable natural vegetable fat and the greenhouse gas CO2 are used as raw materials, so the method is environment-friendly, low in cost and simple and feasible in process operation, the solvent and the catalyst can be efficiently recycled, and the method is environment-friendly and suitable for industrialized production.

The invention belongs to the technical field of water treatment and provides a preparation method of an olefin ether and unsaturated carboxylic acid copolymer anti-sludging agent. The anti-sludging agent is synthesized through the following steps: (1) adding halogenated acid into a reaction system after the olefin ether is alkalized, raising the temperature to react, filtering, distilling, and drying in vacuum to obtain a carboxylic acid reaction monomer of the olefin ether; (2) raising the temperature and enabling the carboxylic acid reaction monomer of the olefin ether and the unsaturated carboxylic acid to react under the action of an initiator system, and cooling to the room temperature to obtain the olefin ether and unsaturated carboxylic acid copolymer anti-sludging agent. The anti-sludging agent contains a super-hydrophilic polyether structure and a large number of carboxyl, is good in water solubility, reacts easily with calcium ions in a circulating water system, and has an excellent anti-sludging property for calcium carbonate, calcium sulfate and calcium phosphate.

The invention relates to the electrostatic spinning filed, in particular to composite electrostatic spinning integrated by initiator and a preparation method thereof. The composite electrostatic spinning of the invention is composed of skeleton high polymer, polydimethyl siloxane and initiator, wherein, the mass ratio of the skeleton high polymer to the polydimethyl siloxane is 90:10-10:90, the mass ratio of the polydimethyl siloxane to the initiator is 1:0.1-1:10-9, and the diameter of the composite electrostatic spinning is 50nm-10 mu m. The method of the invention comprises the following steps: dissolving the skeleton high polymer and the precursor of the polydimethyl siloxane, curing agent and the initiator in corresponding solvents to prepare uniform spinning solution, performing electrostatic spinning, heating and curing spinning products, curing the precursor of the polydimethyl siloxane under the action of the curing agent to form a three-dimensional network structure, and covalently fixing the initiator on the polydimethyl siloxane. The product of the invention is composite electrostatic spinning integrated by the initiator, and the initiator is covalently combined on the surface of the electrostatic spinning, therefore, compared with other methods, the electrostatic spinning of the invention is more stable and durable.