22results about How to "Molecular weight controllable" patented technology

The invention provides a high-moisture-permeability and high-stability humidity-sensitive polyurethane material and a preparation method thereof, and relates to the technical field of material preparation, the material architecture comprises a polyol component, an isocyanate component, a chain extender component and a functional agent component, wherein the polyol component accounts for 80-92% of the whole ingredient, the isocyanate component accounts for 3-5% of the whole ingredient, the chain extender component accounts for 2-5% of the whole ingredient, the functional agent component accounts for 5-10% of the whole ingredient, the polyol component is adaptive to different performance emphasis of packaging and spinning, the isocyanate component meets the difference of processing, environment and service life, and the functional agent component accounts for 5-10% of the whole ingredient. The chain extender component adapts to the thickness and strength requirements of a membrane material, the functional agent component aims at special environment and functional requirements, perfect matching of the material and an application scene of a target product is achieved through accurate blending of the component proportion, the adaptive scene of the humidity-sensitive polyurethane material can be greatly met, meanwhile, the function of the humidity-sensitive polyurethane material is utilized and played to the maximum extent, and the application prospect of the humidity-sensitive polyurethane material is widened. Material waste is avoided, cost is saved, and production is maximized.

The invention discloses a colored end-capped photosensitive polymer and a preparation method and application thereof, black photoresist and a black matrix, and relates to the technical field of photoresist, and the colored end-capped photosensitive polymer is prepared from the following raw materials: a dianhydride monomer, alcohol, a colored end-capped monomer, a first diamine monomer and a second diamine monomer. A photosensitive polymer molecular chain is terminated through a colored group containing an azo structure, so that the OD value of the black photoresist can be remarkably improved, and the black photoresist can have relatively good mechanical properties and photoetching properties.

The invention provides an oligomeric micromolecule donor compound as well as a preparation method and application thereof. The oligomeric small molecule donor compound belongs to a brand-new long conjugate organic small molecule donor material containing a connecting unit, two or more efficient organic small molecule donors are combined into a whole, the conjugate length is prolonged, and a series of novel oligomeric small molecule donor materials are synthesized. The oligomeric small molecule donor compound disclosed by the invention has good batch repeatability and relatively good film-forming property; the oligomeric small molecule donor compound prolongs the conjugate length, has excellent ultraviolet-visible light absorption performance, has strong interaction and aggregation among molecules, can realize good phase separation from a non-fullerene receptor, has a proper electron energy level, and is suitable for being used as an electron donor material in an organic solar cell.

The invention provides a preparation method of ultralow-viscosity vinyl methoxy-terminated silicone oil, which is mainly applied to a structure control agent in the field of silicone rubber.The preparation method comprises the steps that a polydimethylsiloxane linear body serves as a raw material, dimethyl vinyl methoxy silane serves as an end-capping reagent, a base catalyst is added, a polymerization reaction is conducted till the viscosity is stable, and the ultralow-viscosity vinyl methoxy-terminated silicone oil is obtained. And adding phosphoric acid gel for neutralization, carrying out gradient heating to 90 DEG C, and carrying out devolatilization under a vacuum condition to obtain the methoxy hydroxyl-terminated silicone oil. The technological process is simple and easy to operate, and the product is uniform in molecular weight distribution and high in flash point, has the advantages of improving the processability and the mechanical property as a structure control agent, and can improve the molecular crosslinking density and improve the strength of a silica gel product in the product vulcanization technological process.

The invention provides a novel method for efficiently preparing polysulfone resin, and belongs to the field of high polymer materials. According to the synthesis method of the polysulfone resin, the catalyst and the active ligand are mainly added into a reaction system, so that a water removal step is avoided, the reaction time is shortened, the reaction temperature is reduced, and the reaction rate is increased. Comprising the following steps: taking a bisphenol derivative and a dihalogenated benzene compound as reaction monomers, taking sodium carbonate and the like as an acid-binding agent, carrying out reaction in a polar aprotic solvent, carrying out constant-temperature polymerization for 2-3 hours under the protection of nitrogen, and then adding an end-capping reagent to control the progress of the polymerization reaction. And after the reaction is finished, cooling, pressing the material into a filter, filtering, boiling with deionized water for 6-8 times, filtering and drying. According to the technical scheme, the steps of salification and water removal are not needed, the reaction temperature is effectively reduced, the production time is shortened, and the production efficiency is improved.

This invention discloses a water-soluble anti-collapse agent, its preparation method, and a water-based slurry. The raw materials for the water-soluble anti-collapse agent include melamine, formaldehyde aqueous solution, polyol, epichlorohydrin, water, initiator, organophosphonate, and comonomer. The preparation method includes the following steps: mixing melamine and formaldehyde aqueous solution, adjusting the pH, and then reacting; introducing polyol into the reaction system to continue the reaction; then introducing organophosphonate solution into the reaction system, followed by epichlorohydrin to continue the reaction; finally introducing comonomer and initiator to continue the reaction, and then drying and optionally crushing to obtain the water-soluble anti-collapse agent. A water-based slurry containing the above-mentioned water-soluble anti-collapse agent is also provided. The anti-collapse agent provided by this invention has a filtration loss reduction rate of more than 70% against complex salts and a shale secondary rolling recovery rate of more than 80%. It has good salt resistance, temperature resistance, wall consolidation, and filtration loss reduction performance, and also has the advantages of being environmentally friendly, having low fluorescence, and good water solubility.

The present invention provides a bisphenol A type high molecular weight polycarbonate polyether polyol and a production process thereof, and relates to the field of chemical and chemical engineering technology. The production process is carried out in an integrated tubular reaction device, including mixing the raw materials in a premixing unit at one time and then entering the reaction pipeline; during the polymerization reaction, the flow directions of the material and the gas are opposite, ensuring that a sufficient amount of CO2 participates in the material movement process, and CO2 gas with a higher pressure is introduced when the temperature rises sharply. Through the above-mentioned control process and the special reaction device, sufficient gas-liquid heat conduction and gas-liquid-solid mixing are achieved, solving the problem of too low ester content of the product caused by the one-step preparation process. The obtained product has a stable molecular weight, a narrow molecular weight distribution, a high ester content, is not easy to produce explosion polymerization, has no amplification effect, and can be industrialized and mass-produced.

The invention discloses a method for synthesizing functional polyether in a multi-proton system, which comprises the following steps: mixing an epoxy monomer, an amino alcohol / acid compound, organic alkali and alkyl boron for polymerization reaction to obtain carbamate / amide / oligopeptide functional polyether. According to the invention, the hydroxyl is preferentially activated in a multi-proton system by utilizing an acidic reversal phenomenon of an NH type proton group and the hydroxyl in a double-component organic catalytic system, so that a polymerization reaction is only carried out at a hydroxyl / carboxyl terminal; and finally, carbamate / amide / oligopeptide functional polyether with controllable molecular weight and a clear end group structure can be synthesized in a site selective manner through a one-step reaction, and the method is simple, convenient, efficient, controllable and suitable for large-scale industrial application.

The application provides a kind of biomimetic peptide anti-icing and antifreezing agent and its preparation method and application, belong to the field of biological polymer synthesis;The biomimetic peptide anti-icing and antifreezing agent described in the application uses hydroxyl side chain as hydrophilic side chain, alkyl chain as hydrophobic side chain, and is synthesized by solid phase subunit synthesis method according to the designed structure to obtain biomimetic peptide anti-icing and antifreezing agent containing different hydrophilic and hydrophobic sequences;The biomimetic peptide anti-icing and antifreezing agent can form hydrogen bond interaction with the surface of ice crystal to inhibit water molecule movement, and the hydrophobic alkyl group can affect and prevent water molecules from gathering through hydrophobic interaction, thereby effectively regulating ice crystal growth.

The present invention relates to a collapse-preserving polycarboxylic acid water-reducing agent prepared from an ester-terminated unsaturated polyether monomer and a preparation method thereof. The structural formula of the ester-terminated unsaturated polyether monomer is as follows: wherein R1 and R2 are (CH2) n , n is an integer of 2-8; R3 is C1-C 12 The ester-terminated unsaturated polyether monomer prepared by the present invention has various molecular structures, adjustable hydrophilicity and lipophilicity, and controllable molecular weight. Compared with the traditional collapse-retaining polycarboxylic acid water-reducing agent, the ester-terminated polyether is gradually hydrolyzed in concrete, so that the prepared water-reducing agent has a higher retention capacity.

The invention discloses an epoxy resin composition containing a phosphorus-containing flame-retardant curing agent as well as a preparation method and application of the epoxy resin composition, and belongs to the technical field of preparation of flame-retardant epoxy resin compositions. The epoxy resin composition comprises the following components in parts by weight: 80-100 parts of an epoxy resin matrix, 10-30 parts of a phosphorus-containing flame-retardant curing agent, 6-60 parts of a curing agent, 0.1-0.3 part of an accelerant, 10-30 parts of a synergistic flame retardant, 40-60 parts of filler and the like. The phosphorus-containing flame-retardant curing agent is prepared from phenyl phosphoryl dichloride and a bisphenol compound through a polymerization reaction. The phosphorus-containing flame-retardant curing agent with phenolic hydroxyl reaction active groups is prepared by using low-cost phenylphosphoryl dichloride as a raw material and is matched with an existing flame-retardant system, so that the contradiction between the flame-retardant property and the physical property (mainly Tg) of an epoxy resin material is solved; and the flame retardant grade of V-0 and the higher glass transition temperature can be achieved when the addition amount of the flame retardant is lower.

This invention discloses a novel cross-linked polymeric demulsifier and its preparation method. Specifically, it uses a polyoxyethylene / polyoxypropylene block polyether demulsifier as a base, which undergoes esterification of terminal hydroxyl groups, followed by a Michael addition reaction with ethylene amine to obtain the cross-linked polymeric demulsifier. This novel cross-linked polymeric demulsifier exhibits low organochlorine residue, a simple production process, mild reaction conditions, controllable molecular weight, and uniform molecular weight distribution. In application, it offers significant advantages such as high demulsification efficiency, rapid demulsification speed, low dosage, and low demulsification temperature, as well as broad applicability to various crude oil emulsions.

The invention provides polyphenyl ether resin and a preparation method thereof, and a polyphenyl ether resin composition and application thereof. The polyphenyl ether resin is prepared through an oxidative polymerization reaction, and the specific process comprises the steps that compound amine, copper salt, phenolic compounds and aromatic hydrocarbon solvents are added into a reaction kettle, and the polymerization reaction is completed under the condition that oxygen-containing gas is introduced; and carrying out post-treatment to obtain the polyphenyl ether resin. In the polyphenyl ether resin, the proportion of the chain segments with the absolute molecular weight of 0-10000 is 5-40%, the proportion of the chain segments with the absolute molecular weight of 25000-50000 is 60-99%, and the hydroxyl concentration is 0.01-100 [mu] mol / g. The polyphenyl ether resin disclosed by the invention is blended and modified with other plastics, and the saturated water absorption rate of a product subjected to injection molding is less than 0.5%; the method is suitable for processing injection-molded polyphenyl ether products, and is especially suitable for processing photovoltaic junction boxes, new energy battery brackets and electric control shells of household appliances in an injection-molded manner.

The invention belongs to the field of pesticide preparations, and particularly relates to a preparation method of a polyol oxalic acid ester polymer drug-loaded sustained and controlled release microsphere, which comprises the following steps: 1) reacting polyol, oxalyl chloride and an acid-binding agent to obtain a polyol oxalic acid ester polymer; 2) dissolving a polyol oxalate polymer and a pesticide agent in a volatile organic solvent to serve as an oil phase; dissolving a surfactant in water to serve as a water phase; (3) adding the oil phase into the water phase, carrying out high-speed shearing emulsification, and then carrying out cell disruption dispersion to obtain O / W type emulsion; and volatilizing the O / W type emulsion to remove the volatile organic solvent to obtain the polyol oxalate polymer drug-loaded sustained and controlled release microspheres. The release rate of the encapsulated medicine can be regulated and controlled, and the encapsulated medicine can be gradually collapsed in a weakly alkaline environment, so that the problem of environmental pollution caused by micro-plastic residues can be effectively avoided.

This invention relates to the field of polymer technology, and discloses a catalyst composition, polylactide, its preparation method, and its applications. The catalyst composition of this invention contains a zinc complex and a hydroxyl-containing compound. When the catalyst composition provided by this invention is used for the ring-opening polymerization of lactide to prepare polylactide, it not only exhibits high catalytic activity, but also produces a polymer with a high molecular weight, adjustable molecular weight, and a narrow molecular weight distribution.

This invention relates to a novel organochlorine-free crosslinked polymeric demulsifier and its preparation method. Specifically, a linear polyether demulsifier is reacted with a chain extender, homogenizing anhydride, to obtain an esterified chain-extended product of the linear polyether demulsifier. This esterified chain-extended product is then reacted with a crosslinking agent, a diol, under specific temperature and catalytic conditions to obtain the novel organochlorine-free crosslinked polymeric demulsifier. This novel organochlorine-free crosslinked polymeric demulsifier is effective in demulsifying and dehydrating crude oil emulsions that are severely emulsified, difficult to separate oil and water, and challenging to demulsify due to high concentrations of polymers, surfactants, alkalis, and other active substances remaining in the produced fluids of tertiary oil recovery. It also meets the key quality control indicators specified by oilfields when purchasing oilfield chemicals.

The application relates to a preparation method of an ultra-high-temperature fluid loss additive for well cementing, and belongs to the technical field of oilfield chemicals. After surface modification of palygorskite by a silane coupling agent, the surface polymerization sites of the palygorskite are obtained, so as to participate in a polymerization reaction. N,N-dimethyl acrylamide and other non-ionic water-soluble monomers, 2-acrylamide-2-methylpropanesulfonic acid, itaconic acid, sodium styrene sulfonate and other anionic water-soluble monomers, and vinyl pyrrolidone, sodium p-styrene sulfonate and other rigid monomers are used as polymerization raw materials to synthesize polymer grafted palygorskite. The fluid loss additive has excellent temperature resistance and salt resistance, has excellent fluid loss performance in a high-temperature and ultra-high-temperature environment, the fluid loss amount is less than 50 mL at 240 DEG C, has no obvious influence on other basic performances of cement slurry, can effectively improve the suspension stability of the cement slurry at high temperature, and is suitable for being used as a fluid loss additive for cement slurry under harsh conditions.

The invention discloses a preparation method and application of a degradable polyepoxy chain extender. The structural formula of the chain extender is as follows: the invention adopts solution polymerization to obtain a copolymer with controllable molecular weight and narrow molecular weight distribution, and the polymerization process reduces the hydrolysis of epoxy groups in glycidyl methacrylate, improves the reaction activity of the chain extender, and can achieve a good chain extension effect of the polymer material at a low addition amount; and the main chain of the chain extender contains an ester group, has good biodegradability in acidic, alkaline or microbial environments, and is applied to degradable plastics without affecting their degradation performance.

The invention relates to the technical field of polymer chemical synthesis, in particular to a preparation method of methoxy polyethylene glycol methacrylate or methoxy polyethylene glycol acrylate. A two-step synthesis method is adopted and comprises the following steps: firstly, carrying out ethoxylation reaction on methacrylic acid or acrylic acid and ethylene oxide in the presence of a catalyst to generate a methacrylic acid polyethylene glycol ester intermediate or an acrylic acid polyethylene glycol ester intermediate; and carrying out end capping on the intermediate, alkali and halomethane through a Williamson ether synthesis reaction to obtain high-purity methoxy polyethylene glycol methacrylate or methoxy polyethylene glycol acrylate. The invention overcomes the problems of high reaction temperature, low conversion rate, insufficient product purity and easy polymerization of methacrylate or acrylate in the traditional transesterification method, and overcomes the defects of long synthetic route steps and high cost in the prior art. The method has the advantages of mild process conditions, controllable molecular weight and high product purity, and is suitable for the fields of biomedical materials, cosmetics, polymer emulsifiers and the like.

The invention provides bisphenol A type low-molecular-weight polycarbonate polyether polyol and a production process thereof, and relates to the technical field of chemistry and chemical engineering. The production process is carried out in an integrated tubular reaction device, and comprises the following steps: premixing the epoxy compound, CO2, bisphenol A and a catalyst, and feeding the mixture into a reaction pipeline at one time to carry out polymerization reaction. In the polymerization reaction process, slow heating control and gas pressurization compensation are carried out, so that the molecular weight polydispersity index PDI of the bisphenol A type low-molecular-weight polycarbonate polyether polyol does not exceed 1.5, the carbonic ester chain link proportion FCO2 is greater than 55%, and in the Lab color system, the b value does not exceed 0.1. Through the regulation and control process, the problem of yellowing of the product generated in the one-step preparation process of the bisphenol A type low-molecular-weight polycarbonate polyether polyol can be solved, and the production efficiency is high. And the prepared product is narrow in molecular weight distribution, does not generate implosion, has no amplification effect, and is suitable for industrial large-scale production.

This invention discloses a Co-CFA-1-based butadiene polymerization catalyst and its preparation method. The butadiene polymerization catalyst comprises Co-CFA-1, a co-catalyst, and toluene solvent. The Co-CFA-1 is prepared by heating a dispersion of CFA-1 and cobalt acetate tetrahydrate in NMF at 55–65°C for 18–30 hours, followed by filtration, washing, and vacuum drying to obtain Co-CFA-1. The co-catalyst is composed of alkylaluminum and methylaluminoxane, wherein the alkylaluminum is selected from at least one of diethylaluminum chloride, triisobutylaluminum, and diethylaluminum chloride. This invention provides the application of the Co-CFA-1-based butadiene polymerization catalyst in the preparation of cis-polybutadiene, which can produce high-quality polybutadiene rubber products with high cis-structure content, controllable molecular weight, and narrow molecular weight distribution, and the product yield is high.

The invention belongs to the field of high-molecular compounds, and particularly relates to a thermocrosslinkable polyisobutylene block copolymer with a regular structure and a preparation method thereof. The preparation method comprises the following steps: firstly initiating polymerization of a first monomer IB through active / controllable cationic polymerization, then adding an end-capping reagent for end capping to obtain a stable PIB+ active center, and then adding a regulator to regulate the Lewis acidity and reaction activity of the system; and then adding a second monomer 4-VBCB to continue the polymerization reaction to prepare the polyisobutylene-based copolymer. The polyisobutylene-based copolymer disclosed by the invention has good mechanical properties after thermal crosslinking.