35results about How to "High priming activity" patented technology

A preparation method of a polycarboxylate high-performance water reducer, under the protection of an inert gas and under the action of an oxidation-reduction initiation system and a chain transfer agent, the active macromonomer A (methallyl poly Oxyethylene ether), small molecule monomer B (methacrylic acid or acrylic acid) and small molecule monomer C (sodium methacrylate, sodium propylene sulfonate or sodium styrene sulfonate) are prepared by copolymerization in water. The invention adopts a highly active oxidation-reduction initiation system, which can increase the polymerization reaction rate, lower the polymerization temperature and shorten the reaction time, and the polymer has an ideal molecular structure. The water reducing agent prepared by the invention has excellent properties such as high water reducing rate, good dispersibility, no loss of slump over time, and high concrete strength; at the same time, the method of the invention adopts copolymerization reaction in water, the preparation process is simple, and it also has green Environmental protection, low energy consumption, low cost and other characteristics.

The invention discloses a kind of compounds with a general formula of I-VIII. The compounds can be singly used as an alkene unsaturated system photopolymerization initiator and also can be combined with another photoinitiator and/or other additives.

The invention provides a synthesis method for ultraviolet photoinitiator XBPO, which comprises the following steps of: putting sodium hydride and solvent benzene into a stirring reaction kettle, dropwise adding dichlorophenyl phosphine, putting catalyst organic base, dropwise adding 2, 4, 6-trimethyl benzoyl chloride, slowly dropwise adding pure water, slowly dropwise adding oxidant, dropwise adding 2% sodium hydroxide, washing with water, concentrating, crystallizing, filtering, and drying to obtain the ultraviolet photoinitiator. The synthesis method has the advantages that the photolytic product of the ultraviolet photoinitiator XBPO has two trimethyl benzoyl chloride and one phenyl phosphine acyl free radical, which are higher in initiation activity, compared with the photo initiation activity of TPO. The wide wave band has light sensitivity, so that the GR-XBPO not only can be independently used, but also can be used in cooperation with the other ultraviolet absorbers.

Provided is a preparation method for a polycarboxylate high-performance water reducer. The water reducer is prepared by copolymerization reaction of macromolecule monomer methoxy polyethylene glycol mono(meth) acrylate ester, small molecule monomer (meth)acrylic acid and sodium styrene sulfonate in an aqueous solution under the protection of inert gas and the action of a redox initiation system and a chain transferring agent. According to the invention, a high-activity redox initiation system is employed, which enhances the polymerization rate, reduces polymerization temperature, shortens reaction time, ensures non-hydrolysis of macro-molecular polyester monomers in the process of polymerization and a high conversion rate of raw materials, and guarantees that polymers have long side chains arraying at uniform intervals and an ideal comb shaped molecular structure. The water reducer prepared in the invention has the characteristics of a high water-reducing rate, a small slump loss and the like, and enables concrete with the water reducer to have high strength; simultaneously, the copolymerization reaction is carried out in water in the method, and therefore the method has the characteristics of simple preparation technology, environmental protection, low cost, etc.

The invention discloses a method for preparing water-soluble graft polymers through active/controllable radical polymerization. The method can be used for controllable radical polymerization of various water-soluble monomers of a (methyl) acrylamide monomer, (methyl) acrylic acid, (methyl) acrylate and the like, so as to prepare the water-soluble graft polymers with different molecular weights. The preparation method is particularly realized through the following steps: firstly, preparing a water-soluble polyfunctional macroinitiator by adopting a chemical modification manner; secondly, initiating active/controllable radical polymerization of the water-soluble monomers by the macroinitiator under the heating or visible light/ultraviolet light irradiation condition, and preparing the molecular weight and chemical constitution controllable water-soluble graft polymers. The method is simple in synthetic route, low in production cost and safe and convenient to operate; the prepared macroinitiator is high in dissolution rate in water phase and high in initiating activity, and can be used for preparing the chemical constitution and molecular weight controllable water-soluble graft polymers.

The invention discloses a UV adhesive for LCDs, which is characterized by being prepared by mixing the following materials in percentage by weight: 55 to 85 percent of epoxy resin, 2 to 9 percent of photoinitiator, 1 to 5 percent of promoter, 3 to 10 percent of cross-linking agent, 10 to 30 percent of diluent, 0.5 to 3 percent of thickener, 0.2 to 2 percent of stabilizer and 0.5 to 1.5 percent of other assistant. By adding the photoinitiator, the crosslinking agent and the promoter into the epoxy resin system, the product has high damp and heat resistance, high yellowing resistance and high machine-shaping performance; and by adding the stabilizer, the thickener and other assistant at the same time, the product has high adhesive performance and long service life for adapting to gradually increasing needs of the LCD industry.

The invention provides a coumarin oxime ester photoinitiator and a preparation method thereof. The molecular structure general formula is shown in the formula (I). The photoinitiator triggers photocuring under the radiation wavelength of 360-450 nm, and is applied to the fields such as single-photon 3D printing, double-photon 3D printing, printing ink and photoresist. The photoinitiator can serveas an LED photoinitiator and a double-photon photoinitiator, good triggering activity is achieved, one photoinitiator has two purposes, and the manufacturing cost is reduced to a certain degree.

The invention relates to a special and high-effective expression promoter of a sugar cane stem and an expression vector of a plant, a PCR method is enlarged after the total DNA is extracted from sugar cane, and then the expression vector is connected with a pMD-18T vector, the cell of bacillus coli DH5Alpha is transformed, through selecting the masculine, the promoter of the sugar cane hexose transportation protein gene PST2(Alpha) is cloned and obtained, the length of the promoter is 1968bp, through replacing the composition CaMV35S promoter on the expression vector pCAMBIA1301 of the plant, a new expression vector of the plant is constructed, and the name is pCAMBIA1900. By obtaining the promoter, an effective tool is provided for the research of the sugar cane trans-gene and the sugar cane molecular in the biology, and the essential condition of the research and the development of the biological product with high additional archery is particularly created for adopting the sugar cane as the bioreactor production. Therefore, the obtaining of the promoter has an important theoretical and practice significance.

The invention discloses a thioxanthone derivative photo-initiator for UV-LED curing, a preparation method and an application thereof. The preparation method comprises the following steps: adding thiosalicylic acid into concentrated sulfuric acid, and then adding phenol derivative for cyclization preparation; pouring a first-step reaction solution into cold water, performing suction filtration after forming sediment, and repeatedly washing with water, thereby acquiring an orange crude product; dissolving the crude product, filtering, washing with water, purifying solution, regulating pH value,centrifugally separating, and drying in an oven, thereby acquiring an end product of thioxanthone derivative photo-initiator. Such a compound can be singly used as the photo-initiator for substitutinga thioxanthone initiating system, so that yellowing caused by amine-aided initiator can be reduced, excitation wavelength is longer, curing reaction under 395-405nm UV-LED irradiation can be realizedand the thioxanthone derivative photo-initiator has an extensive application prospect in the photo-curing industrial field.

The invention aims to provide a photoinitiator composition suitable for a UV-LED light source. The photoinitiator composition is a photocuring composition composed of thioxanthone photoinitiator, benzoyl methyl formate and acyl phosphine oxide photoinitiator according to a ratio of 1-2:1-2:2-4. The photoinitiator composition has quite high photoinitiation efficiency under the UV-LED light source and can greatly improve the problem of bad surface drying which is common at present. The invention aims to further provide a photocuring composition with excellent performance. The photocuring composition comprises 20-40% of epoxy acrylate, 5-20% of acrylic resin containing tertiary amine structure, 20-60% of active diluent, 1-5% of photoinitiator composition, 0.5-1% of auxiliary and 0-30% of pigment.

The invention discloses a scratch-resistant special coating and a preparation method thereof. The scratch-resistant special coating comprises polyester acrylate, amine modified polyether acrylate, ethoxylated trimethylolpropane triacrylate, a wetting agent, a dispersing agent, a thickening agent, a leveling aid, nano silicon dioxide, fatty alcohol, a photoinitiator and a polymerization inhibitor.The preparation method comprises the following steps: sequentially adding the polyester acrylate, the amine modified polyether acrylate, a coalescing agent, the leveling aid, the wetting agent, the dispersing agent, the thickening agent and the polymerization inhibitor into a reaction kettle A, stirring the materials to obtain a solvent A, adding nano silicon dioxide and fatty alcohol into a high-pressure reaction kettle B to obtain a solvent B, slowly adding the solvent B into the solvent A, then mixing and stirring the materials, finally sequentially adding the photoinitiator and ethoxylatedtrimethylolpropane triacrylate into the reaction kettle A, and stirring the materials to obtain a coating. The prepared coating has excellent wear resistance, scratch resistance and good comprehensive mechanical properties.

The invention provides a thioxanthone visible light initiator, and a preparation method and application thereof. The structure of the thioxanthone visible light initiator is shown as a formula (I), and R in the formula (I) is benzyl, 4-dimethylamino benzyl, 4-methyl benzyl, 3-methyl benzyl, 2-methylbenzyl, 4-benzyloxybenzyl, 4-methoxybenzyl, 3-(trifluoromethyl)benzyl, 4-bromobenzyl, 3-cyanobenzyl, 3-nitrobenzyl, 2-(trifluoromethyl)benzyl, 3, 5-di(trifluoromethyl)benzyl or 4-cyanobenzyl. The thioxanthone visible light initiator provided by the invention has good compatibility with acrylate, can effectively initiate monomer polymerization without an auxiliary agent, can initiate cationic polymerization or free radical-cationic polymerization of epoxy and vinyl ether monomers when being compounded with iodonium salt, has high initiation activity, is simple in structure, and facilitates industrial production.

The invention discloses a synthesis and polymerization method of a phenolic hydroxyl-containing amino acid-N-thiocarboxylic anhydride (NTA) monomer. An amino acid (comprising N-substituted glycine)-NTA monomer with unprotected phenolic hydroxyl is synthesized for the first time; in the synthesis method, raw materials are cheap and easy to obtain, a synthesis route is simple and the structure of atarget product is clear. In controllable ring-opening polymerization on the monomer, polymerization reaction conditions are moderate; organic amine can trigger one or more of amino acid-NTA to be subjected to the ring-opening polymerization in a solvent and react at the temperature of 0 DEGC to 150 DEG C for 0.5 hour to 4 days, so that a corresponding polyamino acid homopolymer or copolymer is prepared. A chain length of the polymer can be controlled through a feeding ratio of the monomer/an initiator and structural characteristics are clear. The invention provides a novel method for synthesizing an amino acid polymer with a side chain containing phenolic hydroxyl, and the novel method has a great application prospect in the field of biological materials.

The invention discloses a polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is prepared from raw materials: by weight, 340-360 parts of methoxypolyethylene glycol, 20-40 parts of methacrylic acid, 2-10 parts of hydroxyalkyl acrylic ester, 2-6 parts of catalyst, 2-6 parts of polymerization inhibitor, 2-6 parts of oxidizing agent, 1-5 parts of reducing agent, 1-5 parts of tartaric acid and 640 parts of water. The preparation method of the polycarboxylate superplasticizer is carried out at the temperature ranging from 5 DEG C to 40 DEG C. According to the preparation method, the problem of low efficiency at temperature during use of one type of reducing agent can be avoided, dropwise adding time can be shortened, production cycle can be shortened, energy consumption can be lowered, and production cost can be decreased.

The invention belongs to the technical field of photoinitiator materials, in particular relates to a preparation method of a benzophenone photoinitiator, and solves the problems that in the prior art, the initiation activity of the benzophenone photoinitiator is not high, and the benzophenone photoinitiator is easy to migrate and volatilize in the curing process. The preparation method of the benzophenone photoinitiator comprises the following steps: reacting diphenylmethane with 4-(N-formyl-N-methyl) aminobenzoyl chloride to obtain an intermediate product I; reacting the intermediate product I with 3-dimethoxycinnamic acid, adding water and sodium hydroxide, and reacting to obtain an intermediate product II; the intermediate product II, 5-hydroxyindole-2-ethyl formate and 2-phenoxy ethyl acrylate are subjected to a reaction, and a final product is obtained. The molecular structure of the obtained photoinitiator is modified by introducing the methoxy group and the indole group, and the obtained benzophenone photoinitiator is low in volatilization, low in yellowing, low in migration, good in stability and high in initiation activity.

The invention discloses photoinitiator suitable for solidifying an LED as well as a preparation method and application of the photoinitiator. An electron-donating group is coupled to an acyl phosphorus skeleton structure, so that absorption wavelength red shifts to 385nm, and polymerization of unsaturated monomers can be effectively induced under the radiation of a UV-LED lamp; the photoinitiator has good dissolubility in various types of resin monomers, low polymers and diluents, is high in induction velocity and is especially applicable to surface solidification of coatings, ink and the like.

The invention relates to a fluorine-containing polymer microemulsion wetting reversal agent, a preparation method and application thereof. The fluorine-containing polymer microemulsion wetting reversal agent is prepared by the following method: in the presence of an emulsifier, emulsify the fluorine-substituted acrylate monomer in water; dissolve the acrylic monomer and the initiator in an organic solvent , and then drop into the emulsion of fluorine-substituted acrylate, and carry out polymerization reaction at 75-85°C to obtain a polymer microemulsion wetting reversal agent. The fluorine-containing polymer microemulsion wettability reversal agent is used to modify the reservoir layer, so that the reservoir layer changes from water wettability to hydrophobicity. The invention has mild reaction conditions and safe process; the fluorine-containing polymer wetting reversal agent is simple to use, has good compatibility with other water-soluble systems, and can be directly put into use without purification.