252results about How to "Go green" patented technology

The invention discloses a nontoxic antifouling paint for an oceanographic ship and facilities and a method for preparing the paint. The paint consists of the following components in percentage by weight: 15 to 55 percent of base material, 0.01 to 10 percent of antifouling agent, 10 to 30 percent of filler, 0.3 to 25 percent of pigment, 2 to 8 percent of auxiliary agent and 3 to 55 percent of solvent, wherein the antifouling agent is silver grains with average grain diameter of between 1 and 200nm. The paint does not contain toxic agents, such as dichloro-diphenyl-trichloroethane, organic tin,cuprous oxide and the like, at all while effectively suppressing corrosion of marine biological attachments, meets the related regulations of international maritime organization and future development trend of the antifouling paint, realizes non-toxicity and environmental friendliness of the marine antifouling technology, and can be widely applied to the facilities and the fields, such as ships, floating piers, marine oil platforms, submarine cables, cooling pipes of power plant near the sea, sea water culture net cage and the like.

The invention provides an aviation hole-forming robot end effector which is suitable for plane skin drilling and can be used for automatically adjusting the attitude. The end effector comprises a leading screw feeding module, a binary angle adjusting mechanism, a compacting chip-absorbing module, a drilling module and a sensor module. The leading screw feeding module mainly comprises a leading screw driving motor, a synchronous transmission component and a dual-ball leading screw and is used for realizing feeding motion of drilling; the binary angle adjusting mechanism mainly comprises a stepping motor, a transmission gear, a wedge-shaped turn table and a spherical hinge and is used for realizing the automatic adjustment of the tail end attitude; the compacting chip-absorbing module mainly comprises a cylinder, a pressing cylinder, a cylinder connecting rod and a compacting head and is used for realizing compaction of a skin and the absorption of metal drill chips; the drilling module mainly comprises a drilling servo motor, a transmission shaft, a drill chuck and a drill bit and is used for realizing high-accuracy drilling; and the sensor module comprises a proximity sensor and a laser distance-measuring sensor and is used for realizing zero addressing and limiting of the movement of a main shaft, and the measurement of the normal line of a drilling point.

The invention discloses a construction optimizing and operating method of an automatic fixed-point picking-up system of a logistics express. A system optimizing scheme containing a picking-up machine layout, a customer demand point attribution division and an express delivery line is generated according to the geographical position, demand amount and relevant logistics cost of a demand point of city express customers. When the system operates, a delivery center classifies expresses according to an automatic picking-up machine service range of the delivery center and the expresses are delivered by delivery workers according to an optimized delivery line scheme; and meanwhile, picking-up information is sent to the customers. After the customers pick up the expresses, the information is fed back to the delivery center by a picking-up machine so as to finish the whole express delivery task; otherwise, the customers are manually called to pick up the expresses; and if the customers cannot be contacted, the expresses are sent back to sending places to finish the delivery task. By virtue of the operation of the system, the abutting problem of time and space of the delivery workers and picking-up persons can be effectively solved in the express delivery process, so that the express delivery cost is reduced, the whole efficiency is improved, and the low carbonization and greening of the logistics express are realized.

The invention discloses a solid-acid catalysis and supercritical extraction coupling preparation method of furfural and a device thereof, pertaining to the technical field of the preparation of biobased chemicals. The method adopts solid acid as a catalyst, such as superacid or molecular sieve, and uses supercritical CO2 (SCCO2) for on-line extraction and separation of products. In the whole preparation process of the furfural, raw material aqueous phase and supercritical fluid phase successively enter a tower for realizing the countercurrent contact multiple-extraction which is carried out in a catalysis filling extracting tower. In the whole process, the solid acid is easily separated from the product, can be recycled and has little corrosion to equipment. Discharge amount of the three wastes is small and operation is convenient and safe. Furthermore, the SCCO2 has low cost, no toxicity, good diffusivity performance and easily controllable solubility, and such a defect as mass transmission efficiency reduction in a heterogeneous catalytic reaction after the use of the solid acid can be overcome when the SCCO2 is used for on-line extraction of the furfural, so as to immediately remove coking precursors from a catalyst pore passage, thereby deferring the inactivation of the catalyst, realizing green and clean production technology and wide application prospect.

The invention relates to a super deep coal underground gasification technology, comprising: firstly detecting according to a coal buried depth and a delineation shape, designing a main axial line extending continuously in a deep gasified coal bed according to geological conditions, wherein a vertical shaft and a horizontal well are arranged every 300m in the main axial line; burning a deep passage; igniting to bidirectionally simultaneously burn by adopting butane and electricity through the pressure of an air compressor so as to generate a coal gas. The ultra-deep coal underground gasification technology carries out deep underground gasification by utilizing the shallow coal underground gasification technology and the oil extraction vertical well and horizontal well combination technology, enables the deep coal to be sufficiently utilized and the part of coal resources to play a role, has low extraction cost and thoroughly realizes the energy greening and the zero emission through a poly-generation recovery and reinjection technology.

The invention discloses a novel ecological permeable concrete material and a preparation method thereof. The concrete material has the advantages of high strength, high permeable coefficient, adjustable porosity, shorter curing time, simple preparation method and the like, has a very high application value in a sponge city building process, and has important significance to the realization of continuous development of permeable concrete and the maintenance of underground water ecological balance. The novel ecological permeable concrete material is prepared from the following specific components in parts by mass: 400 to 500 parts of natural aggregate, 75 to 92 parts of ordinary Portland cement, 4 to 7 parts of desulfurized gypsum, 4 to 10 parts of silica fume, 0.5 to 1.5 parts of water reducing agent, 22 to 36 parts of water, 4 to 12 parts of adhesive polymer and 0.5 to 1.2 parts of rapid hardening early strength agent.

The invention belongs to the technical field of composite materials, and relates to a thermoplastic composite material and a preparation method and application thereof. The thermoplastic composite material comprises the following components in percentage by mass: 40-60% of jute fiber and 40-60% of polypropylene fiber. Compared with the prior art, the composite material provided by the invention is environment-friendly and can be degraded naturally; with certain mechanical strength, the composite material can meet the requirement of the automotive trim material for strength; moreover, the composite material also has excellent processing performance and safety performance; and through the invention, the technological flow is shortened, the production efficiency is improved, and more importantly, the green and light automotive trim material is realized. Through the invention, the technological flow is simple, the composite material is easy to manufacture, and the raw materials are widely available and low in price, thereby being favorable for lowering the cost of the composite material; and moreover, a composite board has perfect toughness and does not form an acute-angle section after being broken, thereby being safe and reliable.

The invention relates to multi-strength regeneration brick aggregate fiber concrete and a preparing method thereof. The multi-strength regeneration brick aggregate fiber concrete is prepared from cement, fine aggregate, natural coarse aggregate, regeneration brick coarse aggregate, polyolefin fiber, steel fiber and water according to the weight ratio of 1: (0.780-1.309) : (0-1.830) : (0.390-1.568) : (0-0.019) : (0-0.161) : (0.33-0.48). The regeneration brick aggregate fiber concrete with the target strength grade of CF30-CF50 can be prepared by means of the raw materials, strength grade is high, and application range is wide. The obtained regeneration brick aggregate fiber concrete has high working performance including peaceability and water-retaining property, compressive strength and splitting-tension strength are high, the preparing process is simple and environmentally friendly, and construction is easy.

The invention belongs to the technical field of the chemical industry, which relates to a load type nano gold catalyst for preparing lactone by catalyzing air oxidation alpha, omega-diol. The invention adopts nano iron oxide as a carrier of a gold catalyst, the iron oxide is synthesized by a hydrothermal method, and nano iron oxide carriers with different crystal types and patterns can be preparedby calcination. The gold catalyst is prepared by a precipitation settling method, the prepared catalyst has small gold particles and good dispersivity, the interaction of gold and the carrier is strong, the gold catalyst represents an excellent activity in the preparation of gamma-butyrolactone by the direct oxidation of 1,4-butanediol through catalyzing air and the preparation of delta-valerolactone by oxidizing 1,5-pentanediol and conforms to the requirement of green chemistry, and the generation of lactone by oxidizing alpha, omega-diol in one step is realized. A magnetic iron oxide carrier can be obtained by selecting a proper preparation method, and the invention is convenient to separate and recover the catalyst and has better industrial application prospect.

The invention belongs to the technical field of nonwoven fabrics, and discloses sandwich microcapsule composite antibacterial nonwoven fabric and a preparation method and application thereof. The sandwich microcapsule composite antibacterial nonwoven fabric comprises an intermediate layer and a first surface layer and a second surface layer which are arranged at the two sides of the intermediate layer. The composition of the intermediate layer is antibacterial microcapsules. The first surface layer and the second surface layer are nanofiber membranes prepared by electrostatic spinning. The microcapsules are prepared by using natural herbal antibacterial components, and the electrostatic spinning technology is adopted so that the disadvantages that the microcapsules are poor in stability, liable to lose and low in acting efficiency can be overcome. The prepared sandwich microcapsule composite antibacterial nonwoven fabric is green, environment-friendly and stable and has great antibacterial effect.

The invention discloses a preparation method of a graphene / Fe3O4 / polyaniline ternary wave-absorbing composite material, and relates to the technical field of ternary composite conductive material production. The method is characterized in that a process using aniline monomer to directly reduce graphene oxide is used, and the coordination interaction of the graphene oxide and Fe3O4 is used to prepare the graphene / Fe3O4 / polyaniline ternary composite material, so that the goal of greenization of the nano composite material preparation and compounding and refinement of the wave-absorbing material structure can be realized. In the composite material, polyaniline organically wraps the surface of the compound of Fe3O4 and graphene to form a specific layer-by-layer assembled structure. The specific surface area is greatly increased by the laminated graphene sheets, and more interfacial polarization and interfaces are caused by the layered structure and the core-shell structure. The prepared ternary composite material is capable of realizing impedance matching and is beneficial to the attenuation effect of electromagnetic waves by the additional interfacial polarization and multiple interfaces caused by the layer-by-layer assembled structure.

The invention provides a high efficiency and low foam environment-friendly type scouring agent and a preparation method thereof, wherein the scouring agent comprises: 15-25% by weight of dodecyl diphenyl ether sodium disulfonate, 5-15% by weight of C12-16 seconary Alkane Sulphonate Sodium, 15-25% by weight of alkyl polyglucoside, 10-150% by weight of isomeric alcohol ethoxylates, and the balance being water. The concrete steps for preparing the scouring agent, comprising: adding water into a mixture of dodecyl diphenyl ether sodium disulfonate and C12-16 seconary Alkane Sulphonate Sodium, and then mixing the mixture for dissolving; and (2) adding alkyl polyglucoside and isomeric alcohol ethoxylates into the mixture obtained in the step (1), and then uniformly mixing. The product is used as a green environmental protection printing and dyeing auxiliary agent with the advantages of simple technology, environment-friendly formula and excellent performances.

The Chinese medicine as green additive for feed of fat hog consists of 12 kinds of Chinese medicinal materials including basket fern rhizome, fleeceflower root, cocklebur fruit, Herba Siegesbeckiae, haw, etc., which are sun dried, crushed to 40-60 mesh and mixed to form the additive. It is added into the base feed of fat hog to make fat hog high in resistance, fast in growth rate and no residue of antiseptic, hormone and other chemicals.

The invention discloses a method for preparing a nicotinic acid by catalysis-free decarboxylation of a dinicotinic acid in high-temperature liquid water. The method comprises the following steps: (1) deionized water and the dinicotinic acid are added to a high-pressure reaction kettle with the mass ratio of the deionized water to the dinicotinic acid being 2:1-8:1, the reaction kettle is stirred, the temperature of the reaction kettle is heated up to cause the mixture in the reaction kettle to boil, and an air exhaust valve is opened for 2-5 minutes; (2) the air exhaust valve is closed, the temperature is continuously heated up to 150-250 DEG C for decarboxylation for 5-60 minutes; (3) decarboxylate is cooled, the pH value thereof is adjusted to 3-4, and crude nicotinic acid is obtained after crystallization; and (4) a nicotinic acid product is obtained after the crude nicotinic acid is decolorized by active carbon, recrystallization and drying in vacuum. The method for preparing the nicotinic acid by catalysis-free decarboxylation has the advantages of no catalyst in the reaction process, solving the pollution problem in the existing nicotinic acid preparation, simple and pollution-free process and high product purity and yield.

The invention relates to a method for preparing 2,6-dichloro-4-nitroaniline through direct chlorination of chlorine gas and oxidative chlorination of hydrogen peroxide. The method comprises the following steps: (1) adding paranitroaniline into hydrochloric acid at the concentration of 5-35wt%, heating to 40-80 DEG C, stirring for uniformly mixing, slowly inflating the chlorine gas within 0.5-5h, slowly adding hydrogen peroxide dropwise, and after adding the chlorine gas and the hydrogen peroxide, continuing to preserve heat and react for 0.3-1.5h; (2) filtering a product obtained in the step (1), washing a filter cake to be neutral, and drying to obtain the 2,6-dichloro-4-nitroaniline. By regulating a dosage ratio of the chlorine gas to the hydrogen peroxide, the concentration of the hydrochloric acid in a reaction system can be kept unchanged, the reaction process is steady and easily controlled, and the product is high in yield and purity.

A soluble TiO2 nanocrystal is prepared from 3-valence Ti-contained inorganic salt, hydrogen peroxide and alkali solution through open reflux reaction or closed hydrothermal reaction at 60-220 deg.C for 1-24 hr. Its advantages are uniform granularity (5-40 nm), high solubility or dispersity in water, alcohol and ketone, high photocatalytic activity and good deodoring, antibacterial and antimildew performance.

The invention relates to a preparation method for 9, 10-dihydroxy stearic acid and methyl ester, which is characterized in that the oleic acid and the formic acid are mixed uniformly in room temperature; the mixture is added with hydrogen peroxide, and warmed up and separated from water phase; the solvent is recycled through decompression and distillation; the generative reaction admixture is recrystallized with organic solvent, so that the product 9, 10-dihydroxy stearic acid is prepared. The recovered formic acid solution can generate ice-cream calcium formate salt separation by adding calcium oxide and calcium carbonate; subsequently the methyl alcohol and oil of vitriol is arranged into the product 9, 10-dihydroxy stearic acid for a reflux reaction, and then is rotated and vaporized out the water phase and oil phase for being washed to be neutral, thereby the 9, 10-dihydroxy stearic acid methyl ester product is generated through dehydration. The invention has the advantages of clean process, safe implementation, easy operation, full utilization of the reactant, reduced waste emission, effective utilization of the low-concentration hydrogen peroxide, and favorableness to large-scale production.

The invention discloses an integrated lobster-rice farming method, which includes the following steps of: (1) lobster cultivation; (2) lobster seedling release; (3) lobster seedling management; (4) first season lobster catching; (5) rice-lobster farming; (6) second season lobster catching; (7) reserved lobster seedings; (8) rice harvest; (9) lobster wintering. The invention relates to the breedingof fresh-water lobster cultivation with rice planting. The whole process does not use chemical fertilizers, chemical pesticides and hormones to produce ecological, high-quality lobsters and rice. Theeconomic benefit of fresh-water lobster cultivation with rice planting combined model is five thousand yuan more than fresh water alone, and two thousand yuan more than rice cultivation per mu, and fully realizes the green, compound, high-potency and scale of the agricultural industry.

The invention discloses an intelligent city environment transformation people and thing interactive system and belongs to the field of intelligent cities, environment protection, the Internet of Things, artificial intelligence and robots. The system is mainly composed of an intelligent home environment transformation monitoring module, a people and thing area positioning and monitoring module, an intelligent robot monitoring module, a digital speech video module, a cloud server and a human-computer interface information exhibiting command control terminal. According to the system, environmental greening transformation such as plant cultivation and novel resource management is conducted with families as units to promote greening transformation of the community environment, and then environment transformation of the whole city is promoted and an intelligent city with a green environment is realized; on the other hand, by means of the concentration of family information and authorization and interaction of users, orientation nursing of the aged, children, pets and articles is achieved, security and protection monitoring is achieved, people can make an appointment for food ordering and shopping, resource exchanging is achieved, voice and video interaction is achieved, communication and interaction among people are promoted, the utilization rate of resources is increased, and the highly efficient intelligent people and thing interaction city is realized.

The invention provides a device for degrading aflatoxin by using plasma. The device comprises a plasma emitter, a water cooler, a plasma generator and a processor, wherein the plasma emitter is connected with the water cooler; the water cooler is connected with the plasma generator; a plasma generating storehouse and a plasma electrode capable of adjusting pitch are arranged in the plasma generator; the plasma generator is connected with the processor through a connecting pipe; and the processor is externally connected with a vacuum pump for adjusting density of gas in the device. Based on physical treatment, the device can degrade the aflatoxin in agricultural products efficiently, quickly and safely. According to experimental verification, the device has the obvious effect of degrading the aflatoxin; the degrading rate can reach over 50 percent; and the problems of pollution to chemical agents, damage to nutrients, sense and functional characteristics of products, overhigh cost and the like in the prior art are solved.

The invention relates to a method and equipment for treating tripolycyanamide waste water by using ultrafiltration membranes and belongs to the field of waste water treatment. In the invention, waste water from tripolycyanamide production is treated by using the ultrafiltration membranes, an ultrafiltration system consists of three ultrafiltration membrane modules which are connected in series, each ultrafiltration membrane module has three sets of parallelly working ultrafiltration membrane equipment, ornithine aminotransferase (OAT) pulp enters the three ultrafiltration membrane modules in turn, and the ultrafiltration membranes divide the OAT pulp into concentrated OAT pulp, resident fluid and pure tripolycyanamide and penetrating fluid. The resident fluid enters a resident fluid tank from the third ultrafiltration membrane module and is subjected to high-temperature and high-pressure treatment; and the OAT and tripolycyanamide are decomposed into ammonia and carbon dioxide, which are recovered and reduced. The penetrating fluid is discharged from each set of ultrafiltration membrane equipment and recycled as process circulating water, and thus, the zero waste discharge of a tripolycyanamide device is realized. The production of waste slag in a tripolycyanamide production process is avoided, the process is environment-friendly, the process atom economy is high, limited resources are saved, and energy consumption and cost are reduced.

The invention discloses a preparation method of coating type natural color sand flexible face brick and a construction technology thereof, which belong to the field of building material. The face brick is prepared by mixing the following constituents in percentage by weight: 12-16% of water, 0.1-0.2% of cellulose, 15-22% of emulsion, 20-25% of 41-80 mesh natural color sand, 40-50% of 81-120 mesh natural color sand, 2-5% of 21-40 mesh natural color sand, 0.08-0.12% of PH regulator, 0.02-0.06% of defoaming agent, 0.8-1.2% of antifreezing agent, 0.1-1% of thickening agent and 0.02-0.1% of preservative. The invention has the advantages of better flexibility, energy saving, environment protection, stain resistance and coating durability of above 15 years, and is suitable for heat insulation finish coat out of outer wall.

The invention relates to the preparation of molecular sieves, and aims at providing a method for synthesizing a silicon-rich ZSM-48 zeolite molecular sieve by using a seed-crystal guiding method. Themethod for synthesizing the silicon-rich ZSM-48 zeolite molecular sieve by using the seed-crystal guiding method comprises the following steps: placing an alkali source, a silicon source, seed crystal, an organic additive and an aluminum source in a mortar to be mixed, transferring a mixture to a reactor to be crystallized after grinding; then carrying out suction filtration on a reaction productand drying to obtain ZSM-48 zeolite molecular sieve raw powder. The method for preparing the silicon-rich ZSM-48 zeolite molecular sieve disclosed by the invention greatly improves the yield and further reduces unnecessary loss in the production process because no solvent is used; and the method further avoids the use of expensive organic template agents with higher toxicity to greatly reduce thesynthesis cost, is environment-friendly in the synthesis process, and finally realizes the greening and low cost of synthesis of all-silicon and high-silicon ZSM-48 zeolite molecular sieves.

The invention provides a piezoelectric nanometer generator prepared by taking a spring as a base, and a self-driven dynamometer based on the nanometer generator. The spring type nanometer generator comprises a spring base, a conductive outer surface included by a spring wire forming the spring base, a piezoelectric body layer and an outer electrode, wherein the piezoelectric body layer is tightly contacted with the outer side of the conductive outer surface, and the outer electrode is tightly contacted with the outer side of the piezoelectric body layer. The piezoelectric body layer can generate a piezoelectric effect under the condition that deformation of the spring base occurs, and outputs electric signals to an external circuit through the conductive outer surface and the outer electrode. A self-driven pressure sensor and the measurement can be realized by using the advantage that the compression distance of the spring has a linear relation with an applied external force. The self-driven dynamometer provided by the invention is small in size, and can be arranged in various mechanical components conveniently; and the self-driven dynamometer does not need an external power supply during operation, and has the advantages of safety, reliability, environmental protection and the like, thereby being of great significance for sustainable development of intelligent transportation and modern industries.

The invention discloses a full-spectrum solar hydrogen production-hydrogen storage integrated system which comprises a light-focusing part, a photo-electric conversion part, a photo-thermal conversionpart, a hydrogen production subsystem and a hydrogen storage subsystem, wherein the light-focusing part focuses and reflects incident full-spectrum solar to the photoelectric conversion part and thephoto-thermal conversion part; the photo-electric conversion part is used for converting waveband solar energy in band gap fit with the photoelectric conversion part into photo-electric energy; the photo-thermal conversion part is used for converting residual full-spectrum waveband solar energy into photo-thermal energy; in the hydrogen production subsystem, hydrogen is produced by utilizing photo-electric energy to electrolyze water; in the hydrogen storage subsystem, the hydrogen produced by the hydrogen production subsystem is utilized to react with a first reactant for an endothermic reaction of hydrogen absorption; a heat source of the endothermic reaction is the photo-thermal energy; the occurs between nitrogen is utilized to react with a second reactant for an exothermic reaction ofnitrogen absorption; and a reactant-product relationship exists between the first reactant and the second reactant. The integration of full-spectrum hydrogen production and hydrogen storage is realized.

The invention discloses a traditional Chinese medicine composite for treating gstrointestinal dysfunction and a preparation method thereof. The traditional Chinese medicine composite is characterized in that the composite is composed of the following components in parts by weight: 1-6 parts of rhizoma atractylodis macrocephalae extract, 1-4 parts of radix paeoniae alba extract, 1-3 parts of pericarpium citri reticulatae extract and 1-3 parts of divaricate saposhnikovia extract, wherein the extracts are coarse powder obtained by smashing the traditional Chinese medicine and are extracted with a carbon dioxide supercritical extraction method. The traditional Chinese medicine composite disclosed by the invention fully extracts effective ingredients, and the pharmacological effect is superiorto the single-component extract, is superior to a full-formula carbon dioxide supercritical extract, and is superior to the composite of volatile oil ingredients and water extract ingredients appliedin the prior art, or the composite of volatile oil ingredients and ethanol extract ingredients.

The invention discloses a preparation method of environment-friendly high-stripping polyurethane / foam compositetype football leather. The preparation method comprises the following steps: firstly scrape coating a piece of releasetype paper with waterborne polyurethane surface layer slurry, drying, and obtaining a polyurethane synthetic leather surface layer; then scrapeblade coating the surface layer with closed aliphatic polyurethane intermediate layer slurry, drying, and obtaining a polyurethane synthetic leather intermediate layer; and pouring smearing solvent-free two-component polyurethane adhesive layer resin onto the surface of the intermediate layer, drying until a semi-dry state, laminating a foam elastic basic material, then continuing the reaction, finally stripping the synthetic leather and the release type paper, and obtaining the football leather. When the football leather is produced and processed, the football leather can be formed in one step, a leather sample does notneed to be cured with the release type paper, and the production efficiency is high; and a stripping strength of the football leather product is high (greater than or equal to 12N / 3cm, 150mm / min), the pattern shape is good, and the beating resistance is excellent (greater than 6000 times, GB / T 22892-2008).

The invention discloses a method for preparing m-dichlorobenzene through catalysis of a nano ZSM-5 molecular sieve and isomerization of p-dichlorobenzene, and aims at solving the technical problems that the homogeneous catalyst, namely aluminium trichloride, cannot be reproduced, generates a lot of acid wastewater in the production process, and cannot achieve continuous production process in the process of preparing the m-dichlorobenzene by isomerization reaction of p-dichlorobenzene. The method comprises the following steps: 1. preparing a raw material solution, and 2. carrying out isomerization reaction. By adopting the method provided by the invention, the environment-friendly nano ZSM-5 molecular sieve solid acid catalyst is high in reaction activity and high in selectivity on a target product m-dichlorobenzene. The reaction process of the method is multi-phase continuous reaction, the reaction product can be easily separated from the catalyst, the operation is simple, and the catalyst can be continuously used, and is free of wastewater and exhaust emission. Therefore, not only is the production cost reduced, but also large-scale industrial production can be achieved. The method disclosed by the invention belongs to the field of preparation of m-dichlorobenzene.

The invention relates to a light stabilizer, and especially relates to a preparation method of a hindered amine light stabilizer. The method is mainly used for solving the technical problems of high cost, non-mild reaction process, complicated operation, high cost, and low yield of prior art adopting dicarboxylate as a raw material. According to the invention, alkyl-substituted-4-hydroxyl piperidine and dicarboxylic acid are added into solvent oil; nitrogen is delivered for protection; heating and dissolving are carried out, and temperature maintaining is carried out; and a reflux reaction is carried out, wherein a molar ratio of alkyl-substituted-4-hydroxyl piperidine to dicarboxylic acid is 2.0:1 to 2.6:1; cooling precipitation is carried out after the reaction is completed; the solvent is separated, and water washing is carried out, such that a crude product is obtained. The crude product is added into fresh solvent oil, and active carbon is added for discoloring; and re-crystallization is carried out, such that a pure hindered amine light stabilizer is obtained.