282results about How to "Initiation efficiency is high" patented technology

The invention discloses a high-solid-content UV-curing aqueous urethane acrylate dispersion liquid and a preparation method thereof, wherein the method comprises the following steps of: firstly carrying out the monoesterfication reaction on the partial hydroxide group at the tail end of hyperbranched polyester and the anhydride group of dicarboxylic anhydride to obtain an intermediate I; carrying out the end capping reaction on an isocyanate group in diisocyanate and the hydroxide group in a hydroxyalkyl methacrylate monomer to obtain a reaction intermediate II; carrying out the reaction on the residual hydroxide group of the intermediate I and the residual isocyanate group of the reaction intermediate II to obtain a reaction intermediate III; and carrying out alkali neutralization, aqueous dispersion and reduced-pressure distillation on the reaction intermediate III to remove an organic solvent to obtain the UV-curing urethane acrylate aqueous dispersion liquid. The dispersion liquid has the characteristics of high solid content, relatively low viscosity, UV curability, good mechanical performance of a paint film and the like, conforms to the concept of environmental protection, can be applied to the fields of environment-friendly coatings, aqueous ink, aqueous adhesives, fabric coating agents and the like and has broad prospect.

The invention discloses a stripping processing method of textile printing defective items, which implements stripping processing on printing defective items and particularly on dyeing defective items by using an active material which is generated by initiating and catalyzing an oxidant or a reducing agent under ultraviolet light and low temperature and has strong oxidability or reducibility as a stripping agent so as to be convenient for the rehandling or redyeing of textiles. Because of the adoption of various active materials which are generated by ultraviolet light initiation and optical catalysis as the stripping agent, the method can obtain an approving stripping effect under normal pressure and temperature, thereby avoiding the consumption of a large amount of energy sources in a traditional high-temperature stripping method and the use of a large amount of reducing agent, oxidant and the like. The stripping technology of the invention has the advantages of high efficiency, energy saving, emission reduction, simple equipment and process and short procedures.

The invention discloses a preparation method of a polycarboxylate superplasticizer with a high water reducing rate. The polycarboxylate superplasticizer is prepared through adopting the preparation method comprising the following steps: according to parts by mass, with an unsaturated polyether macromonomer and an unsaturated sulfonic acid micromonomer as dropwise adding components 1, an azo initiator, a peroxide initiator and an initiation accelerant as dropwise adding component 2, acrylic acid as a dropwise adding component 3 and a molecular weight modifier as a dropwise adding component 4, feeding the unsaturated polyether macromonomer and the unsaturated sulfonic acid micromonomer as well as deionized water into a reactor, stirring and increasing the temperature; when the temperature rises to a dropwise adding temperature, orderly dropwise adding the dropwise adding components 1-4 to the reactor at a constant speed for 3-5 hours; after the dropwise adding is finished, preserving heat for 0.5 hour to 1.5 hours to obtain a copolymerization product; and after the reaction is finished, adding an aqueous solution of sodium hydroxide for neutralization to obtain the polycarboxylate superplasticizer having the pH value in the range from 6 to 7. The preparation method disclosed by the invention is simple in reaction process, easy to control the reaction and low in production cost; the product obtained through the reaction is high in water-reducing rate and good in slump loss resistant and slow-release properties.

The invention provides a coumarin dyestuff linked by naphthene ketones, method for synthesis and use, wherein the method employs the conventional hydroxyaldehyde condensation reaction and consists of, charging naphthene ketone, corresponding aldehydes with A1 groups into reactor, obtaining semi-naphthene ketone dyestuff with A1 groups, subjecting corresponding third position methyl substituted or fourth position methyl substituted coumarin having A2 group and selenious acid in another catalyst case to obtain coumarin aldehyde having A2 group, subjecting the A1 group semi-naphthene ketone dyestuff and A2 group coumarin aldehydes to reaction at the presence of mixed solvent of dimethylbenzene and alcohol, thus obtaining coumarin type dyestuffs coupled by naphthene ketones.

The invention discloses a method for receiving a downlink message and a mobile terminal. The method comprises: receiving a broadcast message of a first network and the broadcast message of a second network by a mobile terminal; receiving the downlink message sent by the first network, when the terminal is standby in the first network, a received paging period specified in the first network and carried by the broadcast message of the first network being a first paging read period; determining a second paging read period when the terminal is standby in the second network, according to the received paging period specified in the second network and carried by the broadcast message of the second network, the determined second paging read period being larger than the paging period specified in the second network; and receiving the downlink message sent by the second network according to the determined second paging read period when the terminal is standby in the second network. Using the scheme, power consumption when the terminal is standby is lower than that of a multi-mode and multi-standby mode in prior art, stand-by time is increased, and efficiency of initiating the business is improved compared with the efficiency in a multi-mode and single-standby mode.

The invention discloses a high-hardness, high-wear-resistant and anti-fingerprint ultraviolet-curable coating. The coating comprises the following ingredients (by weight): organic fluorine modified urethane acrylate, nano-particle hybrid silicone modified urethane acrylate, high-functionality acrylate oligomer, a photoinitiator, a macromolecular photocuring aid, a diluent and an auxiliary agent. By using the nano-particle hybrid silicone modified urethane acrylate having high hardness and high wear resistance as the matrix resin in cooperation with the organic fluorine modified urethane acrylate having fingerprint fouling resistance and the high-functionality acrylate oligomer capable of increasing crosslinking density, and by adjusting the combination of the photoinitiator while adding the macromolecular photocuring aid in the formula, the ultraviolet-curable coating which has high hardness, high wear resistance and excellent anti-fingerprint effect and can be used for transparent plastic boards is developed. Thereby, the problem that a common coating has low hardness, poor wear resistance and poor anti-fingerprint effect is solved.

The invention discloses a macromolecular bifunctional amino ketone photoinitiator and a preparation method thereof. Single amino ketone photoinitiators are combined with one another by using di-secondary amine, so that a molecular weight is doubled and the defects of easy volatilization, easy migration, smell and the like caused by a small molecular weight are overcome; simultaneously, the number of introduced invalid groups is small and the performance of the initiator is not lowered obviously; moreover, a molecular chain is longer and the problem of poor compatibility is solved. The invention also discloses the application of the macromolecular bifunctional amino ketone photoinitiator in a polymerization reaction. The photoinitiator has high initiating efficiency, high performance in various aspects and wide application prospect and can fully replace a micromolecular amino ketone photoinitiator.

The invention discloses an anti-static optical adhesive which is prepared from the following raw materials in percentage by weight: 1-5% of an antistatic agent, 30-60% of polyurethane acrylate, 20-50% of an acrylate monomer, 5-10% of unsaturated polyester, 0-2% of a photoinitiator (excluding 0%), 3-6% of a crosslinking agent and 1-5% of a coupling agent. The preparation method comprises the following steps: (1) adding polyurethane acrylate, part of the acrylate monomer and unsaturated polyester into a reaction kettle, stirring and heating in a water bath to a stable backflow state; (2) uniformly mixing residual raw materials, putting into the reaction kettle and stirring for polymerization reaction; and (3) finishing the polymerization reaction to obtain the anti-static optical adhesive. The anti-static optical adhesive disclosed by the invention is a colorless transparent viscous liquid matter, has the characteristics of being anti-static, high in light transmittance, high in curing speed, low in cure shrinkage rate and low in haze and the like and can be widely applied to fitting an optical protective thin film base material and a release film.

The invention relates to a preparation method of ultra-high molecular weight cationic polyacrylamide, which belongs to the acrylamide aqueous solution polymerization technical process. The method is characterized in that a cation monomer is acryloyloxyethyl trimethyl ammonium chloride or methacryloyloxyethyl trimethyl ammonium chloride, the amount of the cation monomer accounts for 5-60% of mass of the mixed monomer; an single azoamidine compound initiator is used, the amount of the azoamidine compound initiator accounts for 0.005-0.035% of the monomer mass; initiation is carried out at low temperature, thermal insulating polymerization is carried out, and the initiation temperature is 5-30 DEG C; a cosolvent, a chain transferring agent and addition of the cosolvent account for 2-5% of monomer mass, the addition of the chain transferring agent accounts for 0.01-0.07% of monomer mass, the pH value is adjusted to 6-7, and nitrogen is introduced for removing oxygen for polymerization. The preparation method of ultra-high molecular weight cationic polyacrylamide can prepare the product with relative molecular weight greater than or equal to 25,000,000. The dissolvability is good, the ultra-high molecular weight cationic polyacrylamide accords with the industrial standard, and is easy for large-scale industrial production, and the method can be widely used for the industries of tertiary oil extraction, sewage processing, papermaking, weaving, printing and dyeing and the like.

The invention discloses a low super-cooling degree phase-change material microcapsule and a preparation method thereof. The microcapsule is composed of, by weight, 35-70% of a capsule core and 30-65% of a capsule wall, the capsule core is composed of, by weight, 81.1%-97.6% of an organic phase-change material, 0.1-16.9% of a super-cooling inhibitor and 1.2-2.7% of initiator, and the super-cooling inhibitor is at least one of N,N-diethyl acrylamide and N-isopropyl acrylamide; the capsule wall comprises, by weight, copolymer of 80-95% of methacrylic acid alkyl ester/aryl ester and 5-20% of an alkene propyl ester cross-linking agent; the low super-cooling degree phase-change material microcapsule is prepared by preparing, mixing and reacting of a water-phase mixture and an oil-phase mixture. The phase-change material microcapsule has the advantages that the coating rate is high, the heat storage quantity is high, the thermal performance is excellent, and the super-cooling crystallization phenomenon is particularly improved significantly; the technology is simple, the operation is convenient, the application range is wide, and the industrial implementation is facilitated.

The invention relates to a benzophenone macromolecular photoinitiator and a preparation method thereof. The structural formula of the photoinitiator is shown in the specification. According to the method, an intermediate product (BZOH) is synthesized from 4,4'-dihydroxy benzophenone, paraformaldehyde and diglycolamine as raw materials through a Mannich reaction, and a target product is prepared through reacting BZOH with diisocyanate. According to the macromolecular photoinitiator prepared by the method, the same molecular chain simultaneously contains benzophenone and tertiary amine structures, so that the active species generation efficiency of photosensitive decomposition can be increased; the macromolecular photoinitiator is polyurethane containing a benzoxazine structure, so that the compatibility with an initiating system is improved, the surface migration of the photoinitiator is lowered greatly, and the macromolecular photoinitiator can also serve as a functional material and is believed that the macromolecular photoinitiator can have wide application in the fields of ultraviolet curing and the like. In the structural formula, R1 and R2 are H, CH3 or CH2Cl independently, and at least one of ortho positions of phenol-OH of a 4,4'-dihydroxy benzophenone derivative can not have substituents.

The invention relates to a method for preparing a surface sizing agent for papers. The raw materials used for preparing the surface sizing agent for papers consist of main agents and assistant agents. The main agents are rigid monomers, soft monomers and functional monomers; and the assistant agents are compound emulsifying agents, protective colloids and evocating agents. The proportions of the main agents by weight are as follows: 100 portions of rigid monomers, 40 to 100 portions of soft monomers and 5-40 portions of functional monomers; and the proportions of the assistant agents by weight are as follows: 1 to 10 portions of compound emulsifying agents, 1 to 10 portions of protective colloids and 1 to 8 portions of evocating agents. Compared with the styrene-maleic anhydride surface sizing agent prepared by common emulsifying agents, the surface sizing agent for papers prepared by the method has good mechanical stability, the latex contains no residual emulsifying agents, the particle surface is clean, and no side influence resulted from the emulsifying agents is existed during the sizing and drying process; the surface sizing agent has good membrane forming performance on the paper surface so as to provide excellent water-proof performance and surface flatness for the paper; and the surface sizing agent can increase the stiffness and the smoothness of the paper surface greatly.

The invention relates to a high-solid chrome-free acrylic polyurethane finish paint consisting of two components A and B which are mixed together according to a ratio of 100:25. The component A comprises the following components in parts by weight: 50-65 parts of self-made tert-carbonic glycidyl ester modified hydroxylated acrylic resin (with 75 mass percent of solids), 10-20 parts of a color filler, 10-20 parts of a chrome-free anticorrosive pigment, 0.5-1.5 parts of an anti-setting agent BE-828, 0.5-1.5 parts of a dispersant, 0.3-1.0 part of a defoaming agent, 0.5-2.5 parts of an anti-sagging agent, 0.3-0.5 part of a leveling agent and 5-10 parts of a solvent. The component B comprises the following components in parts by weight: 50-70 parts of fat diisocyanate and 30-50 parts of butyl acetate. The high-solid chrome-free acrylic polyurethane finish paint disclosed by the invention has relatively high requirements for overall properties including weather resistance, fullness, salt fog resistance, adhesive force, chemical resistance and the like.

The invention provides a polymerizable water-soluble benzophenone type photoinitiator and a preparation method thereof. The preparation method comprises the following steps: enabling 3,3',4,4'-benzophenone tetracarboxylic dianhydride to react with an acrylate type monomer containing active hydrogen; introducing polymerizable double bonds into benzophenone molecules; and then adding an alkaline substance to react with carboxylic acid of a product self so as to improve the water solubility, thereby preparing the polymerizable water-soluble photoinitiator. The preparation method is simple to operate and high in product yield, and the obtained photoinitiator is migration-free, good in water solubility and high in initiation efficiency.

The invention belongs to the field of chemical synthesis, and particularly relates to a preparation method of cation exchange resin with high-temperature thermostability. C5-C40 saturated alkane is used as a pore-foaming agent, an efficient initiator is used, styrene and polyethylene monomer are copolymerized in a suspension state so as to prepare a styrene-polyethylene benzene copolymer white ball containing the pore-foaming agent, and then the pore-foaming agent and low-molecular-weight impurities in the copolymer are extracted by an organic solvent, so that a macroporous copolymer with an appropriate pore structure is formed. A mixture of the extracted pore-foaming agent and the organic solvent is simply distilled and separated, and then, the pore-foaming agent and the organic solvent both are recyclable. In the presence of the catalyst, the white ball subjected to extraction is further treated with halogenating reaction. The halogenating product can directly generate sulfonation reaction without being reamed by dichloroethane, then, the high-temperature resistant macroporous cation exchange resin is obtained. The resin has uniform pore size distribution and high strength, and has higher catalytic activity and longer service life when being used in high temperature organic catalytic reaction.

The present invention discloses an E. coli engineering bacteria producing 1,5-pentanediamine through a whole cell catalysis and its application. The engineering bacteria according to the present invention, is Escherichia coli (E. coli) strain B or its derivative strains with the overexpression of a lysine decarboxylase gene and a proper expression of a lysine-cadaverine antiporter gene cadB. The engineering bacteria according to the present invention is the engineering bacteria producing 1,5-pentanediamine through the whole cell catalysis constructed from Escherichia coli B derivative strains, which has an overexpression of a lysine decarboxylase gene cadA and a proper expression of the lysine-cadaverine antiporter gene cadB. The present invention further discloses a method of producing a 1,5-pentanediamine catalyzed by the engineering bacteria, the yield and production intensity of 1,5-pentanediamine in bio-based production could be significantly improved through the method, hence it could be applied to mass production and convenient for extending applications.

The invention provides a fluorene photoinitiator and a photocured composition comprising same. A compound a reacts with a compound b, so that the fluorene photoinitiator is prepared, i.e., the fluorene photoinitiator is obtained by the chain extension reaction between R2 and/or R4 in the compound a shown as formula (I) and the olefinic double-bond compound b containing a substituent group. The fluorene photoinitiator disclosed by the invention not only has excellent photoinitiating activity, but also has the advantages of almost no small-molecule residue, excellent solubility and the like. Theformula (I) is shown in the description.

The invention discloses an assisted initiator amine-containing polymerizable thioxanthone carbazole visible light photoinitiator and a preparation method thereof. The preparation method comprises that a compound containing polymerizable and epoxy groups is added into an amine compound, the mixture undergoes a reaction, the amine is removed so that alcohol containing polymerizable and assisted initiator amine groups is obtained, the alcohol or the alcohol and pyridine are added into chloroform, a mixture of PBr3 and chloroform is dropwisely added into the mixture, the mixture undergoes a reaction, the reaction product is treated to form a bromo-compound containing polymerizable and assisted initiator amine groups, thioxanthone carbazole and alkali are added into N, N-dimethyl formamide (DMF), the mixture is stirred to form a uniform mixture, the bromo-compound, cupferron and the N, N-dimethyl formamide mixture are dropwisely added into the reaction system, the reaction system undergoes a reaction, and the reaction product is treated to form a product. The visible light photoinitiator avoids yellowing and toxicity caused by the micromolecule assisted initiator, reduces oxygen inhibition influences and improves a curing rate and cured film stability.

The invention discloses a polymerizable type thioxanthone visible light initiator containing acrylate or methacrylate and a preparation method of the polymerizable type thioxanthone visible light initiator. Thioxanthone containing an aromatic amino group can be directly reacted with various types of halogenated alcohol to generate thioxanthone containing an aliphatic hydroxyl group; the thioxanthone containing the aromatic amino group can also be reacted with 4-benzoyloxy benzyl chloride, and then is subjected to alcoholysis to generate thioxanthone containing a phenolic hydroxyl group; the thioxanthone containing the phenolic hydroxyl group can be reacted with the various types of halogenated alcohol to generate thioxanthone containing the aliphatic hydroxyl group; then the thioxanthone containing the phenolic hydroxyl group or the thioxanthone containing the aliphatic hydroxyl group is reacted with acryloyl chloride or methacryloyl chloride to form the polymerizable type thioxanthone visible light initiator containing an acrylate structure or a methacrylate structure. The compound disclosed by the invention has very good compatibility with a light curing system; in an application process, any additive does not need to be added, and any auxiliary agent does not need to be added; the polymerizable type thioxanthone visible light initiator is high in initiation efficiency, green and environment-friendly and low in energy consumption, meets the requirements of green chemistry, and has a wide application prospect in the field of visible light curing.

The invention relates to a method for using a plasma surface to initiate alkene serial monomer to prepare in situ alloy of polymer by polymerization. The method comprises the following steps: plasma surface processing is carried out on polymer granule; the processed polymer granules are combined with the alkene serial monomer; under the initiation of surface active substances, the alkene serial monomer is polymerized into polymer with high molecular weight without adding an initiator; the polymerization is initiated at two phase interfaces directly; in addition, in the process, the alkene serial monomer is grafted on the surface of the polymer granule so as to obtain performed polymer series; and the obtained performed polymer series is blended and intermixed so as to lead the whole series to be evenly mixed, thus realizing the combination of in situ reaction and the processing process. The invention is simple, convenient and reliable; the obtained product has stable structure and property, thus being capable of carrying out industrial production.