75results about How to "Add less" patented technology

The invention provides an RNA polymerase variant and application thereof, and relates to the technical field of biology. Wild type T7 RNA polymerase is modified to obtain the T7 RNA polymerase variant, the enzyme specific activity of the T7 RNA polymerase variant is remarkably improved compared with that of the wild type T7 RNA polymerase, the addition amount of the polymerase in the in-vitro transcription reaction process can be reduced, and the cost is saved; in addition, the mutant also effectively reduces the generation of incomplete fragment impurities, and the mRNA integrity is significantly improved to 99%. The invention further provides a method for preparing RNA through in-vitro transcription.

The application discloses a differential privacy data publishing method based on risk self-adaption and structured Gaussian noise and relates to the technical field of data mining and privacy protection. The method comprises the following steps: preprocessing original table data and initializing a Rényi differential privacy accountant; calculating sample risk based on self-information and mutual information, and evaluating individual identification and structured correlation risk; constructing a structured dependence relationship between features by using a total variation distance and a spectral decomposition dependent projection algorithm, and generating a noise transformation matrix; constructing a synthetic data pool without real individual mapping based on a noisy edge distribution; and finally performing risk self-adaptive data cleaning and publishing. In the publishing stage, a dynamic camouflage mechanism is implemented according to the distance between the risk score and the sensitive threshold: structured noise is injected into high-risk samples to protect feature dependence, K-nearest neighbor camouflage replacement is performed on risk boundary samples by using a synthetic data pool, and independent noise is injected into low-risk samples. The application effectively retains the statistical correlation of data under the premise of strict privacy protection by fine risk measurement and structured noise injection, and significantly improves the utility of data in machine learning modeling.

This invention relates to the field of polymer material synthesis technology, specifically to a modified PVB resin and its preparation method. The invention introduces a fluorinated acetal monoaldehyde derivative containing fluorine into the PVB resin. This derivative is mixed with n-butyraldehyde and glyoxal, thereby undergoing an acetalization reaction with the 1,3-o-diol structure of the PVB molecular chain, incorporating the fluorinated side link into the PVB molecular chain. Utilizing the high electronegativity and high C-F bond energy of fluorine atoms, it shields against the intrusion of external corrosive media, inhibits oxidative yellowing, and improves weather resistance. Furthermore, the invention introduces glyoxal as a crosslinking agent, containing dialdehyde groups, which can react between adjacent polyvinyl alcohol segments, causing slight crosslinking between the originally linear PVB resin segments, improving the resin's shielding performance, further reducing the intrusion of external corrosive media, and enhancing the stability of the PVB resin.

The invention relates to the technical field of polymer composite material preparation, in particular to a super-tough core-shell stereocomplex polylactic acid-based composite material and a preparation method thereof. The super-tough core-shell stereocomplex polylactic acid-based composite material is prepared from the following raw materials in parts by mass: 70 to 100 parts of polylactic acid and 0 to 30 parts of the modified elastomer in claim 4, and the dosage of the modified elastomer is not 0; the modified elastomer is prepared by melting and blending stereocomplex polylactic acid powder and a functional elastomer copolymer; the stereocomplex polylactic acid powder is prepared by reactive melt blending of PLLA and PDLA in an equal mass ratio or an equal molar ratio. The prepared super-tough core-shell stereocomplex polylactic acid-based composite material has excellent tensile strength and impact resistance, can be applied to the field of engineering plastics such as automobile parts, electronic and electric appliance shells, household products, catering tableware and the like, and has remarkable environmental protection benefits and industrial popularization value.

This invention relates to the field of polymer materials technology, specifically disclosing an environmentally friendly processing aid for polyolefins and its preparation method. The environmentally friendly processing aid for polyolefins includes a first component and a second component. The first component includes an antioxidant-modified oligomer A, and the second component is obtained by extrusion granulation of oligomer B, an organosilicon polymer, and a catalyst. By weight, the amounts of each component are: oligomer A 1-10 parts, antioxidant 0.1-2 parts, oligomer B 5-40 parts, organosilicon polymer 5-80 parts, and catalyst 0.1-5 parts. The processing aid of this invention does not contain perfluorinated or polyfluoroalkyl compounds. When used in the processing of polyolefins, it has advantages such as low addition amount, short onset time, good viscosity reduction effect, and effective improvement of product gloss. Furthermore, it can effectively form a dynamic lubricating layer on the surface of metal walls.

The application discloses a zinc powder automatic control method, device and system for antimony salt purification process, which comprises the following steps: constructing a copper and cobalt removal fitting model, calculating the optimal potential setting value by using a particle swarm algorithm and setting the potential setting value; updating the potential setting value by using a fuzzy algorithm and a case reasoning method; constructing a three-dimensional fuzzy rule according to the difference between the current potential measurement value and the potential setting value, generating a zinc powder adjustment amount, adding the current zinc powder addition amount to obtain a new zinc powder amount setting value, writing the new zinc powder amount setting value into a DCS system on line, and controlling the automatic feeding device to add zinc powder. The above steps are repeated to achieve stable potential control and realize the minimum zinc powder consumption. The zinc powder automatic control method for the antimony salt purification process, which automatically adjusts the zinc powder addition amount according to the potential fluctuation, realizes accurate control of the zinc powder addition amount, effectively reduces the zinc powder consumption in zinc hydrometallurgy, and reduces the production cost in the antimony salt purification process.

The application belongs to the technical field of polymer preparation, and particularly relates to a high-strength self-supporting polypyrrole nano array and a preparation method and application thereof. The preparation method comprises the following steps: (1) first, dispersing a hydroxypropyl-beta-cyclodextrin and polyethylene glycol aqueous solution onto an ice surface, and then adding a pyrrole monomer to form a dispersion liquid; (2) adding an acid solution containing an oxidizing agent to the dispersion liquid, and obtaining the high-strength self-supporting polypyrrole nano array after reaction. The application directly uses a macroscopic ice block as a hard template for polypyrrole preparation, and introduces a cyclic molecule hydroxypropyl-beta-cyclodextrin with hydrophilic and hydrophobic dual functions and polyethylene glycol with a linear polymer chain as an array growth aid, so that a high-strength polypyrrole nano sheet array with a self-supporting structure is prepared through a one-step polymerization method. The high-strength polypyrrole nano sheet array can be used as a conductive filler of polyurethane in the field of 3D printing technology, and greatly improves the mechanical properties and antistatic ability of products.

The present application relates to a kind of biodegradable dark color mulch and its preparation method, and dark color mulch is made of cellulose, hemicellulose and degradable coating.The manufacturing method includes the preparation of dark color mulch substrate, coating layer coating.It specifically includes slurry compounding, beating, additive addition, is formed by papermaking, dehydration, pre-drying, coating, sizing, drying, calendering, product after drying.The local film has good wet strength, light resistance, weather resistance, heat preservation and entropy increasing effect.The results of farmland degradation experiment show that the mulch can be biodegraded after 50~60 days, and the biodegradation rate is more than 90%.

The application belongs to the technical field of additives, and particularly relates to a kind of iridoid glycosides and its application in sweetener or sweet taste regulator. The iridoid glycosides in the application has the structure shown in formula 1, the sweetness is 400 times of sucrose, the sweet taste is fast, the taste and duration are similar to sucrose, and there is no bad aftertaste. The iridoid glycosides can be used as sweetener, sweet taste regulator, used for preparing health food and beverage, or used as oral drug excipient in drug preparation, to achieve the effect of reducing sugar without reducing sweetness.

The application discloses a pretreatment method of gas field water, which comprises the following steps: gas stripping of the gas field water to obtain gas phase and liquid phase, wherein the volume ratio of the gas field water to the stripping gas is 1:8-20; returning the gas phase to the previous step after dry desulfurization; adding the liquid phase into a dissolved air water floatation after oxidative desulfurization and oil-water separation by biomass modified cotton sponge; performing oxidation treatment on the water phase after oil-water separation, then performing sedimentation treatment, and performing filtration treatment on the water phase after solid-liquid separation; removing sulfur and reducing COD by gas stripping and oxidation; treating the hydrogen sulfide gas generated by the gas stripping by dry desulfurization; recycling the desulfurized gas; removing suspended solids, high-valence metal ions with valence of two or more, colloids, organic matters, bacteria and microorganisms by a ceramic ultrafiltration membrane filter and a ceramic nanofiltration membrane filter.

The invention discloses a preparation method and application of a prostate cancer tissue single-cell suspension. The preparation method of the prostate cancer tissue single-cell suspension comprises the following steps: S1, tissue pretreatment: putting a prostate cancer tissue sample into a low-temperature pretreatment buffer solution, and cutting the prostate cancer tissue sample into tissue fragments; s2, circular enzymolysis: mixing the tissue fragments with a composite enzymatic hydrolysate, and performing digestion for multiple rounds under an oscillation condition; after each round of digestion, collecting supernate into a stop solution containing serum, repeatedly digesting the remaining tissues for multiple times, and combining the supernate to obtain a cell crude suspension; wherein the composite enzymatic hydrolysate contains collagenase, protease, nuclease, an androgen receptor stimulant and / or a ROCK inhibitor; and S3, sequentially carrying out separation and purification on the cell crude suspension through filtration and density gradient centrifugation to obtain the prostate cancer tissue single-cell suspension.

The present application relates to the field of polymer manufacturing, and particularly relates to a long-chain branched modification method of rare earth isoprene rubber and / or butadiene rubber, comprising the following steps: S1. performing solution polymerization of isoprene and / or butadiene and isoprene in a non-polar solvent in the presence of a rare earth catalyst to obtain a glue solution containing active polymer molecular chains; S2. when the conversion rate of the polymerization reaction reaches 95% or more, adding a compound branched modifier to the glue solution to perform a branched reaction; wherein the compound branched modifier comprises at least one of a chloride and an alkyl halide and at least one selected from ether compounds and tertiary amine compounds. The branched modifier used in the present application has a strong branching effect, and has good solubility so as to achieve uniform mixing at a molecular level in the glue solution, significantly alleviates the gel side reaction, reduces the gel content, narrows the molecular weight distribution, significantly improves the raw rubber performance, and improves the product uniformity.

The invention belongs to the technical field of capsule preparation, and relates to a glue solution for reducing volatilization of essence in tobacco capsules, which is composed of low-acyl gellan gum, high-acyl gellan gum, agar 1000, agar 600, sodium alginate, sorbitol, potassium chloride, calcium chloride and water in specific mass percentage. The preparation method is characterized in that the content of sodium alginate is increased to 0.22%, 0.05% of calcium chloride is added, and a more compact gel network and a physical wrapping structure are formed in a capsule shell through the ionic cross-linking synergistic effect between sodium alginate and calcium chloride, so that the blocking and retaining capability on essence molecules is remarkably enhanced. The invention also provides a detailed preparation process of the glue solution. The tobacco capsule prepared from the glue solution can reach more than 85% in essence residual rate after being stored for 6 months at room temperature, the essence residual rate is greatly improved compared with the traditional formula, meanwhile, the hardness and disintegration performance required by the capsule are completely maintained, the existing production process does not need to be changed, the glue solution is suitable for various volatile essences such as terpenes and esters, and the essence loss and the production cost can be effectively reduced.

This invention discloses a supported anti-sulfurization reducing agent and its preparation method, relating to the technical field of rubber additives. A supported anti-sulfurization reducing agent includes an adhesive layer and an inner capsule. The adhesive layer is formed by blending a carrier rubber and a fatty acid salt. The inner capsule includes a core material and an inner capsule wall. The core material is the anti-sulfurization reducing agent, while the inner capsule wall is formed by reacting and curing an amino-modified liquid isoprene rubber and a urea-formaldehyde prepolymer. This application, by using microencapsulation, prepares an anti-sulfurization reducing agent with a double-layered supported structure. This not only effectively improves the problems of poor compatibility and difficult dispersion of pure anti-sulfurization reducing agents in rubber compounds, but also effectively protects the active ingredients, which is beneficial for improving the actual utilization rate of the anti-sulfurization reducing agent, reducing the amount of anti-sulfurization reducing agent added, and thus reducing the production cost of rubber products.

The application provides a kind of bio-based high-strength, heat-resistant and easy-to-dye polylactic acid composite fiber and its preparation method, which adds rigid furan polyester and flexible furan polyester blend in polylactic acid matrix, and introduces compatibilizer, realizes in-situ reaction between multi-functionality epoxy groups on the molecular chain of compatibilizer and the end groups of PLA and furan polyester, improves the interfacial compatibility between furan polyester dispersed phase and PLA continuous phase, improves the interfacial adhesion, and finally induces the formation of stable core-shell structure fiber. The PLA composite fiber prepared by the preparation method of the application has excellent mechanical strength and heat resistance. In addition, the preparation method of the application has simple process route, and the addition amount of compatibilizer is very low. It efficiently realizes structure remodeling, and at the same time, it has the original strength of polylactic acid fiber, and has wide application prospect in the fields of medical textiles, orthopedic fixation braided belt and industrial high-performance fiber.

A fuel lubricity improver and its application, said fuel lubricity improver comprising a dicarboxylic acid monool ether ester compound represented by structural formula (I), wherein R1 is a single bond, substituted or unsubstituted C. 1‑18 Divalent alkyl or C 2‑6 The divalent alkenyl group, or a group having a -R4-R5-R6- structure; R2 is CH2, CH2CH2, CH(CH3)CH2, CH2CH(CH3); n is an integer from 1 to 12; R3 is a substituted or unsubstituted C 1‑40 Hydrocarbon group; R4 and R6 are each independently a single bond, or a substituted or unsubstituted C. 1‑3 divalent alkyl; R5 is a substituted or unsubstituted C 3‑12 The fuel lubricity improver, which contains a divalent alicyclic group, can significantly improve the lubricity of fuel and requires a low dosage, thus significantly reducing the cost of using the improver.

The application discloses a method for processing and converting coal gangue into ecological soil, S1, degradation pretreatment: adding a degradation agent to the coal gangue in an aerobic environment at a temperature of greater than or equal to 20 DEG C; S2, crushing and screening: crushing the pretreated coal gangue to a target particle size; S3, high-temperature activation: calcining and activating at 400-950 DEG C at a temperature rising rate of 3 DEG C / min-20 DEG C / min to realize gradient temperature rising programmed decomposition of the coal gangue; S4, heavy metal passivation: adding a passivation agent to generate an acidic complexing / chelating reaction with metal ions for 12-72 h to reduce harmful components; and S5, curing and modification: adding a modifier and treating for 2-24 h to obtain the ecological soil. The method is used to solve the problems of heavy metal pollution, insufficient organic matter, slow conversion, high cost and complex process in traditional treatment of the coal gangue, and provides an environment-friendly, efficient and low-cost ecological soil preparation method.

The invention provides a negative photosensitive resin composition which can obtain a cured film with high visible light shielding property even if a colorant such as carbon black is reduced. The invention also provides a cured film and a resist film. A negative photosensitive resin composition containing the following components (A)-(C): (A) a novolac phenolic resin in which the molar ratio [(a1): (a2): (a3): (a4)] of a structural unit (a1) derived from cresol, a structural unit (a2) derived from dihydroxynaphthalene, a structural unit (a3) derived from benzaldehyde, and a structural unit (a4) derived from salicylaldehyde is 1: (0.25-4.0): (0.25-4.0): (0.25-4.0); (B) a photosensitizer; and (C) an organic solvent.

The application discloses a high-efficiency breathable solid culture medium for Stropharia rugosoannulata and a preparation method thereof, and relates to the technical field of edible mushroom cultivation.The preparation method is characterized by the steps of pre-dispersing dry materials, then atomizing and coating the materials in a liquid phase with glue, and using a viscous water film formed by sodium lignosulfonate on the surface of coarse granular substrates to stably anchor fine granular nutrients and inorganic auxiliary materials on the surface of the coarse skeleton to form a core-shell coating structure, so that the sinking path of the fine materials is completely blocked from the source, and the industry pain points of the Stropharia rugosoannulata solid culture medium, such as the stratification of coarse and fine materials and the sedimentation and hardening of the fine materials at the bottom during mechanical loading and vibration, are effectively solved.

The application provides a modification method of nitrocellulose membrane and application thereof in preparation of microRNA nucleic acid test strips, and relates to the technical field of nucleic acid lateral chromatographic detection.The application provides a modification method of nitrocellulose membrane, which comprises the following steps: treating the nitrocellulose membrane under plasma conditions; the power of the plasma treatment is 25-80 W; the pressure of the plasma treatment is 35-70 Pa; and the time of the plasma treatment is 70-350 s.The modification method of the nitrocellulose membrane can effectively improve the surface performance of the nitrocellulose (NC) membrane, significantly enhance the surface wettability of the nitrocellulose membrane, make the nitrocellulose membrane have strong hydrophilicity, improve the loading capacity of probes, and enhance the stability of probe fixation, so that the cost is reduced and the sensitivity and specificity of the microRNA nucleic acid test strip are improved.

The present application relates to a kind of cylindrical electrode paste and its preparation method.A kind of cylindrical electrode paste, by mass parts, including 15-20 parts of anthracite main material, 25-40 parts of residual anode, 3-10 parts of graphite fragment, 25-35 parts of coke, 15-30 parts of organic binder, 6-18 parts of bio-based binder. Among them, organic binder includes medium temperature pitch, anthracene oil, beta resin. Among them, bio-based binder includes carbonized hydrophobic composite modified wood bamboo powder, sodium carboxymethyl cellulose. The carbonized hydrophobic composite modified wood bamboo powder of the present application and sodium carboxymethyl cellulose are compounded to form a bio-based binder, which cooperates with the organic binder to ensure the bonding strength, high temperature resistance and electrical conductivity of the cylindrical electrode paste, while realizing the green and low-carbon utilization of biomass, solving the problems of high temperature failure, moisture absorption and easy caking, and many pores of traditional bio-based binder, reducing the resistivity and production cost, and improving the structural density and use stability.

The present application relates to a kind of refractory dispersant and its preparation method in the technical field of refractory additive, it is the comb structure copolymer, the copolymer includes styrene-maleic anhydride copolymer main chain, polyethylene glycol side chain grafted on the styrene-maleic anhydride copolymer main chain by ester bond, and phosphate radical;The polyethylene glycol side chain includes short-chain polyethylene glycol with molecular weight of 400-600 and long-chain polyethylene glycol with molecular weight of 800-1200.The present application realizes the precise division of function by using asymmetric compound polyethylene glycol side chain of specific molecular weight range, and controls esterification grafting degree is 50%-85%, not only can provide excellent initial wetting and dispersion force, ensure that slurry has excellent construction fluidity, but also can effectively prevent particle re-aggregation and sedimentation under static or shear, so as to fundamentally solve the technical problem that traditional dispersant is difficult to consider high initial fluidity and long-term anti-settling property, plasticity.

The application belongs to the technical field of hydrogen energy conversion by electrolysis of water, and particularly relates to a doped nickel oxide modified polysulfone composite diaphragm material and a preparation method thereof, which comprises uniformly dispersing polysulfone in N-methyl pyrrolidone to obtain a polysulfone solution, adding PVP or PEG to the polysulfone solution, stirring until complete dissolution to obtain a mixed solution, adding a doped nickel oxide material to the mixed solution, stirring until complete uniform dispersion to obtain a casting solution, degassing the casting solution by stirring, laying the casting solution on the front end of a doctor blade, sliding the doctor blade at a uniform speed to uniformly spread the casting solution on the surface of a glass film to obtain a liquid membrane, pre-evaporating the liquid membrane in air, immersing the pre-evaporated liquid membrane in deionized water to solidify into a film, peeling off the film and cleaning to obtain the doped nickel oxide modified polysulfone composite diaphragm material. By introducing the doped nickel oxide as a functional modification material, the hydrophilicity and conductivity of the diaphragm are effectively improved.

The application discloses a preparation method of a high-performance coal water slurry additive. Tannic acid, crotonic acid and allyloxy polyoxyethylene ether are used as raw materials, a tannic acid-based ternary polymer is obtained through oxidation reaction and free radical polymerization reaction, and then the tannic acid-based ternary polymer is compounded with methylene dianaphthalene sulfonic acid sodium to obtain the high-performance coal water slurry additive. The high-performance additive prepared by the application has a smaller adding amount in a slurry preparation process, and the prepared slurry has better performance. In addition, the additive overcomes the poor matching problem of traditional additives, has good universality, and has good slurry preparation effect in a traditional slurry preparation system, a high-concentration coal water slurry preparation system and a slurry preparation system mixed with organic waste, and especially solves the slurry preparation problems in the high-concentration slurry preparation system and the slurry preparation system mixed with organic waste.

The invention relates to the technical field of permanent magnet preparation, and particularly discloses a high-temperature-resistant neodymium-iron-boron magnet and a preparation method thereof. The high-temperature-resistant neodymium-iron-boron magnet comprises the following elements in percentage by mass: 17.4%-19.5% of Nd, 0.66%-0.72% of B, 38.37%-41.19% of Fe, 0.36%-4.8% of Dy, 0.18%-0.3% of Nb, 0.18%-0.3% of Al, 0.03%-0.09% of Cu, 29.1%-34.8% of an alloy rapid hardening sheet and the balance of unremovable impurities, wherein the alloy rapid hardening sheet contains Pr, Tb, Bi and Sn; the preparation method comprises the following steps: grinding the surface of an alloy rapid hardening sheet to be bright, mixing the alloy rapid hardening sheet with a pretreated magnet block, adding zirconium oxide balls, putting into a reaction kettle of a rotary diffusion furnace, vacuumizing the reaction kettle, introducing argon, rotating at the rotating speed of 4-6r / min, keeping the temperature at 700-704 DEG C for 3-7h, and carrying out rotary diffusion, so as to obtain the zirconium oxide-based composite material. And then carrying out heat preservation at 850-950 DEG C for 2-4 hours for high-temperature diffusion and heat preservation at 450-550 DEG C for 2-4 hours for tempering heat treatment by using a vacuum tube furnace in a vacuum environment. The high-temperature-resistant neodymium-iron-boron magnet has the advantage that the defect that heat resistance of a conventional neodymium-iron-boron magnet is still insufficient is overcome.

The present application belongs to the field of biotechnology, and discloses a composition for regulating the intestinal health of livestock and poultry, which comprises black soldier fly larva intestinal extract, and further comprises poplar flower extract, dihydromyricetin and pine needle powder extract; the weight ratio of the black soldier fly larva intestinal extract, the poplar flower extract, the dihydromyricetin and the pine needle powder extract is 1:0.1-10:0.1-0.5:0.1-10. The composition can improve the intestinal health and reduce the diarrhea of weaned piglets; the composition of the present application is not only beneficial to the improvement of the intestinal health of piglets, but also has a good intestinal health improvement effect on pigs of other ages; in addition, the present application further provides a microemulsion containing the composition, a preparation method and use thereof.

The present application relates to the comprehensive field of mineral resources and the technical field of energy saving and consumption reduction, and particularly relates to application of coal ash in reduction of phosphate ore to obtain yellow phosphorus and a method for reduction of phosphate ore to obtain yellow phosphorus. The method comprises: in a non-oxidizing atmosphere, reduction reaction is carried out on a mixture containing phosphate ore, a reducing agent and a flux, yellow phosphorus furnace gas obtained is subjected to water washing and cooling, so that phosphorus steam in the yellow phosphorus furnace gas is stored in water in liquid or solid form, and yellow phosphorus is obtained; wherein the flux is selected from coal ash and optional silica; wherein the temperature of the reduction reaction is not lower than 1300 DEG C. The method provided by the present application can effectively improve the reduction rate of phosphate ore and shorten the reduction reaction time; the method realizes recycling utilization of coal ash resources.

The invention discloses sec-ethyl phosphate as well as a preparation method and application thereof, and belongs to the technical field of synthesis of flame retardants. Tri (2-ethoxyl) isocyanurate, phosphorus oxychloride and an alcohol compound are used as raw materials, the cyan phosphate is prepared through three-step reaction of preparing phosphoryl chloride diester, refining the phosphoryl chloride diester and synthesizing the cyan phosphate, the molecular structure contains a phosphate group and a triazine ring conjugated structure, and a carbon source, a gas source and an acid source are integrated. The thermal decomposition temperature of the sec phosphate is greater than or equal to 320 DEG C, the UL94V-0 level flame retardant standard can be reached by adding 12%-15% of sec phosphate into a high polymer material, and the sec phosphate has the characteristics of high flame retardant efficiency, good compatibility, strong migration resistance, excellent thermal stability, environmental protection and low toxicity; the synthetic preparation method is stable in process, easy in condition control and high in product purity, can be widely applied to flame-retardant modification of high polymer materials such as polyvinyl chloride, polyurethane and epoxy resin, and has important industrial application value.

The invention relates to a preparation method of a bio-based 1, 5-pentamethylene diisocyanate product with yellowing resistance and high stability. A synergistic composite stable system composed of an efficient main antioxidant, an auxiliary antioxidant and a plurality of ultraviolet absorbents / light stabilizers in a scientific proportion is constructed. Wherein the main antioxidant is mainly used for capturing free radicals and blocking an oxidation chain reaction; the auxiliary antioxidant decomposes hydroperoxide to inhibit the hydroperoxide from further initiating the degradation of the material; the ultraviolet stabilizer effectively delays the color change process caused by illumination by absorbing or quenching excited state energy. The preparation method disclosed by the invention has the advantages of high process compatibility, easiness in acquisition of auxiliaries, simple compounding and post-treatment steps and convenience in large-scale popularization; the environmental protection property is outstanding, the yellowing resistance and the storage stability of the product are greatly improved, the normal-temperature closed storage period is prolonged to 6 months or above, the NCO content retention rate is greater than or equal to 96%, and the storage and transportation cost is reduced; the influence of thermal oxidation and photodegradation is resisted, and a complex application environment is adapted.

The present application relates to a kind of imidazole-based surface treatment additives and its preparation method and application, belong to surface treatment technical field.To solve the problem of acid copper plating bright area current density range narrow and bright agent consumption fast, the present application provides a kind of preparation method of imidazole-based surface treatment additives, sodium hydroxide, imidazole or imidazole derivative, pyridine or pyridine derivative is dissolved in deionized water, epoxy chloropropane is added to the obtained mixed system, reaction until no epoxy chloropropane suspension is observed, and imidazole-based surface treatment additive is obtained.The imidazole-based plating additive prepared in the present application is applied to acidic sulphate copper plating, which can significantly improve the brightness of copper coating in low current density area, realize the mirror surface bright in the wide current density range of 0.1-10A / dm 2 , the glossiness is maintained at 480GU or more, and the consumption rate of sulfur-containing compound main brightener can also be significantly reduced, showing excellent application potential.