457results about How to "Good chemistry" patented technology

The invention provides a method for preparing a polyimide nano-film. The method comprises the steps: firstly, synthesizing polyimide resin from aromatic tetracid dihydride, aromatic diamine and aromatic diisocyanate; and then, mixing the polyimide resin, a polar organic solvent, a diluent, a film forming agent and a molecular weight regulator so as to obtain a polyimide solution system, then, carrying out nano-scale uniform spreading on a clean substrate by dint of the action of a mechanical external force of 0.5N to 30N, and then, carrying out an imidization method, thereby preparing the polyimide nano-film. According to the film, the high-temperature resistance is 10 seconds at the high temperature of 400 DEG C to 750 DEG C, and the electrical insulation property is that the dielectric constant is 1.5 to 4.5 at the frequency of 103Hz. Compared with the prior art, the polyimide nano-film prepared by the method has the advantages of excellent surface physical properties and stable chemical properties, high-temperature resistance, electrical insulation properties and chemical corrosion resistance.

The invention discloses a multienzyme organic fertilizer, wherein the fertilizer can increase soil organic matter contents and varieties of bioactivators, and improve physical, chemical and biological characteristics for soil, and improve soil fertility, and alleviate soil hardened state, and reduce pesticide residue in the soil; on the other hand, the fertilizer can provide progressive, continuous and complete nutrients for plant growth, and improve inner environment of crops at the same time such that the crops have abilities of full digestion and nutrient absorption. The invention can not only improve the yields of the crops, but also can improve qualities of agricultural products, and enhance healthcare functions for agricultural products. The fertilizer is suitable to be used by field crops and greenhouse vegetables, land vegetables, fruits, flowers, commercial crops and so on. The multienzyme organic fertilizer is composed of the following raw materials in percentages by weight: 10-15% of laccase, 5-10% of neutral protease, 10-15% of phytase, 5-10% of cellulose, 1-5% of xylanase, 1-5% of pectinase, 1-5% of amylase and 55-60% of organic fertilizer powder.

The invention discloses double-component self-adhesive addition type flame retardant heat conducting room temperature curing organic silicon pouring sealant. The double-component self-adhesive addition type flame retardant heat conducting room temperature curing organic silicon pouring sealant comprises a component A and a component B and is characterized in that the component A is prepared by mixing a basic material, a platinum catalyst and a coupling agent in mass ratio of 100:(0.00001-0.1):(0.1-1); the component B is formed by mixing a basic material, a coupling agent, an inhibitor and a tackifier in mass ratio of 100: (0.2-1.0):(0.01-1):(1-10); the basic material is formed by mixing vinyl-terminated silicone oil, heat-conducting filler and a flame retardant in mass ratio of 100: (120-160):(20-40). The double-component self-adhesive addition type flame retardant heat conducting room temperature curing organic silicon pouring sealant has good optical performance, heat conduction property and relatively good viscosity and can meet the long-term using requirements in high and low temperature environments.

The invention relates to a one-step initiating polymerization method for preparing nano silica / polymethyl methacrylate gel polymer electrolyte, which is characterized in that: methyl methacrylate used as monomer and the nano silica used as modified particles are mixed directly with prepared lithium perchlorate / propylene carbonate (1mol / l of electrolyte solution used as solvent). The mixed solution is polymerized in water bath heating to 80 DEG C for 2.5 hours, and then reacted gel solution can form the gel electrolyte film after being poured onto a glass board and extending to become film with being dried for 8 hours in the temperature of 60 DEG C. The benefit effects of he invention are that the process of the method is simple and available; the gel solution can be prepared directly with the electrolyte solution being used as the solvent which can take away a large amount of polymerization heat generated by free radical polymerization; the prepared gel polymer electrolyte has satisfied ionic conductivity, and good space size stability and chemical and electro chemical stability.

The invention provides a preparation method of a bimetal organic framework composite material. According to the preparation method, the methanol solution of 2-methylimidazole is added into a zinc salt-containing solvent, and the methanol solution and the zinc salt-containing solvent are stirred uniformly, an obtained mixed solution stands still, so that ZIF-8 can be obtained; the methanol solutionof 2-methylimidazole is added into a solvent containing a proper amount of ZIF-8 and cobalt salt, and the methanol solution and the solvent are uniformly stirred, and an obtained mixed solution stands still, so that a bimetal organic framework precursor ZIF-8@ZIF-67 is obtained; the precursor is transferred into a tubular furnace so as to be subjected to high-temperature annealing, and porous carbon of a core-shell structure is obtained through derivation; the porous carbon material is mixed with PDDA, an obtained mixture is stirred, and the mixture is compounded with graphene oxide; and an obtained product is subjected to freeze-drying and high-temperature annealing sequentially, so that a porous carbon / graphene composite material is obtained. The porous carbon material prepared by the method disclosed by the invention is uniformly distributed on a graphene sheet layer; the composite material is good in stability and low in cost; and when the composite material is applied to an MFC cathode catalyst, the composite material shows good electrochemical catalytic performance.

The invention relates to a tooth orthodontic correction material which comprises the following components based on the total weight of the correction material: (A), 50-90wt% of polyethylene glycol terephthalate-1,4-cyclohexane dimethyl alcohol ester; (B), 5-45wt% of polycarbonate; and (C), 5-45wt% of thermoplastic polyurethane, wherein the sum of the percentage contents of all components of the correction material is 100wt%. The invention also relates to a preparation method of the tooth orthodontic correction material and application of the tooth orthodontic correction material used for manufacturing a tooth orthodontic correction device. The tooth orthodontic correction material disclosed by the invention has high transparency and excellent low-stress relaxation rate and can provide long-time stress and long-lasting correction effect.

The invention relates to the technical field of chemical engineering and in particular relates to a layer-by-layer clicked, bonded and self-assembled graphene oxide polyolefin separation membrane and a preparation method thereof. The preparation method comprises the following steps: mixing an unmodified polyolefin separation membrane with bromine and irradiating bromine by ultraviolet light so as to prepare a bromo-membrane; performing nucleophilic substitution on the bromo-membrane and sodium azide to prepare a polymer membrane with an azide group; preparing graphene oxide with the azide group and alkynyl by using open-looping and condensation methods; performing layer-by-layer clicking, bonding and self-assembling on the graphene oxide with the azide group and alkynyl to be formed onto the surface of the polyolefin separation membrane with the azide group, thereby achieving layer-by-layer clicking and self-assembling modification on graphene oxide on the surface of the polyolefin separation membrane. The preparation method is a universal method for polyolefin separation membrane surface modification. The hydrophilia and the anti-pollution property of the polymer membrane are improved, the polyolefin separation membrane is permanently modified, and thus the polyolefin separation membrane can be widely applied to the field of chemical engineering.

The invention discloses an ether group-containing polymer ion liquid composite-electrolyte and a preparation method thereof. The polymer ion liquid composite-electrolyte has the advantages of high room-temperature conductivity, high lithium ion transport number, low vitrification point, good mechanical strength, good film forming performances, wide electrochemical window and good heat stability, and has wide application values in fields of lithium (ion) cells, carbon-based supercapacitors and solar cells.

A halogenated butyl rubber plug belongs to the technical field of medicinal bottle plug, and is characterized in that the plug is prepared from the following raw materials according to parts by weight: 52-53 parts of halogenated butyl rubber, 38-39 parts of calcined kaoline, 0.5-0.6 parts of octadecanoic acid, 2-3 parts of polyethylene wax, 2-3 parts of zinc oxide, 0.7-0.8 parts of phenolic resin, 1-2 parts of titanium dioxide, 0.2-0.3 parts of carbon black and 0.1-0.2 parts of magnesium oxide. The product is used as medicinal bottle plug and has very high impermeability and water tightness and high saturated framework, thereby expressing good anti-oxygen performance, thermal stability (sterilising) and ageing-resistant performance. The chemical performance and physiological property of the plug are inert, but effective vulcanization can be carried out by using a small amount of non-sulfur non-zinc vulcanizing agent.

The invention discloses an Mxene flexible self-supporting lithium-air battery positive electrode material, a preparation method thereof, an Mxene flexible composite membrane and a preparation method of the Mxene flexible composite membrane. The preparation method of the Mxene flexible composite membrane comprises the following steps: etching an MAX-phase ceramic material by using hydrofluoric acidor a villiaumite-hydrochloric acid mixed solution, carrying out ultrasonic stripping, and carrying out vacuum filtration to obtain an Mxene flexible self-supporting lithium-air battery positive electrode; and carrying out further intercalation treatment on the prepared Mxene flexible electrode to obtain a CNT intercalated Mxene / CNT composite flexible electrode (Mxene flexible composite membrane).The prepared flexible electrode has a unique two-dimensional layered structure, is large in specific surface area, high in electronic conductivity and high in electrochemical stability, and can provide a channel for oxygen circulation and electrolyte transmission; and the CNT intercalated composite electrode effectively reduces the stacking of Mxene materials, and provides enough storage space for discharge products. The material and the composite membrane have wide application prospects in the lithium-air battery.

The invention relates to a coarse polyester fiber, a filter material made of the coarse fiber and a preparation method thereof. The double-component coarse polyester fiber is skin-warped-core structure, wherein, the skin is polymer with low-melting point, the core is polyester with high-melting point, and the coarseness of fiber is 4-8 dpf; the melting point difference between the high-melting point polyester and the low-melting point polymer is not less than 15 DEG C. The preparation method of the double-component coarse polyester fiber consists of the following steps: the low-melting point polymer and the high-melting point polyester are extruded from two different extruders under melting condition and the double-component coarse polyester fiber is formed by composite spinneret spinning. The double-component coarse fiber and the polyester spun-bond filter material of the invention have excellent air permeability and water permeability, outstanding mechanical properties, low pressure loss, long service life and striking economic benefits.

The invention relates to a modified walnut-shell adsorbent containing double amidoxime groups and a preparation method thereof. The preparation method of the modified walnut-shell adsorbent comprises: taking a biomass material walnut shells as an initial raw material, performing pretreatment, firstly reacting with a sodium hydroxide solution and a chloropropylene oxide etherifying agent, reacting the obtained primary-modified walnut shell particles with a diethylenetriamine cross-linking agent for introducing of amino groups, then performing an induced reaction on the obtained secondly-modified walnut-shell particles with acrylonitrile, and then performing further modification reaction on the obtained thirdly-modified walnut-shell particles with a mixed solution of hydroxylamine hydrochloride and sodium carbonate, and performing post-processing, so as to prepare the finished product of the modified walnut-shell adsorbent containing double amidoxime groups, wherein the finished product has brownish yellow appearance and is in the state of particles. The adsorbent provided by the invention has excellent adsorption capacity, is high in removing rate on dye in printing and dyeing waste water and substantial in treatment effect on heavy metal wastewater; the raw materials demanded by the preparation method provided by the invention is wide in resource, and the prepared finished product is excellent in comprehensive performances.

The invention relates to a submarine cable for a power grid interlink of offshore oil platforms, which is characterized in that a plurality of offshore platform power stations on a plurality of offshore oil drilling platforms distributed in a sea area are connected through submarine cables so as to form a small-sized grid-connected power system. The submarine cables are compound type submarine cables, which are provided with submarine optical cable units and optical fibers with the voltage class of 35KV and the cross section of 3*(150-250)mm<2>. The submarine cables have excellent electric, physical and chemical properties, are beneficial to enhancing the communication capability of the grid interlink among all oil fields, and can effectively guarantee the effectiveness of optical fiber communication, greatly enhance the anti-torque capability of the optical fibers and ensure the smooth communication of the power grid interlink.

The multifunctional slow releasing lawn fertilizer is prepared through mixing cake residue, turf, humic acid, nitrogen fertilizer, phosphate fertilizer, potash fertilizer, trace elements, and plant growth regulator. It has perfect nourishing and curing function, slow releasing function, and fast, stable and lasting fertilizer effect. Test shows that lawn with the fertilizer applied has early regreening in spring, no excessive growth in summer, fast restoring in autumn, less diseases and pests and long green period, and is environment friendly.

The invention belongs to the technical field of building materials and particularly relates to inner wall putty powder taking desulfurized gypsum as a base material. The putty powder consists of the desulfurized gypsum, ground slag, aluminate cement, talcpowder, lime, sodium bentonite, methylcellulose ether, hydroxypropyl starch ether and sodium fluosilicate. Due to the adoption of the inner wallputty powder, the problems of recycling and efficient utilization of industrial solid waste, namely the desulfurized gypsum, low activity of the desulfurized gypsum, and easy cracking and peeling of the conventional cement-based putty can be solved effectively. Compared with natural gypsum-based inner wall putty powder, the inner wall putty powder taking the desulfurized gypsum as the base material has better environmental friendliness. The inner wall putty powder is suitable for inner wall construction of various buildings.

The invention discloses a medical infusion bag. The infusion bag is manufactured by using polypropylene and polyethylene and styrene-ethylene / butylene-styrene block copolymer. The infusion bag manufactured by adopting the technical scheme has the advantages that: the air-tightness and the steam resistance are excellent, the chemical stability is high, and the infusion bag is suitable to be used for manufacturing liquid medicinal products requiring high-temperature disinfection and sterilization; the transparence is high, and the detection of foreign materials when the infusion bag is produced and used is ensured; the softness is high, the falling resistance is high, the heat-sealing property is high, the high-temperature resistance is high, and the infusion bag can be sterilized at the temperature of 121 DEG C; because the infusion bag does not contain halogens, the infusion bag does not cause any environmental pollution when processed after use; and simultaneously, the barrier property is high, the chemical inertness and the biological inertness are high, the compatibility with medicaments is good, and the infusion bag can be used for packaging various kinds of common fluid, enteral nutrient fluid, parenteral nutrient fluid, dialyzate, flushing fluid, treating type large-capacity injection and the like.

The invention provides a cement containing large volume of fly ash. The cement includes 30-70 wt% of fly ash, 0.01-10 wt% of nano boehmite and the balance of Portland cement. Nano boehmite has small particles, excellent chemical and mechanical properties and good surface activity, and can be filled into the gaps among cement particles to enhance the forces among cement particles; and the nano boehmite can react with a cement clinker and fly ash to generate hydration products and promote the early hydration of cement, thereby improving the early strength of cement, increasing the addition of fly ash and reducing the cost.

The invention discloses a sulfonated graphene metal salt solid polymer electrolyte and a preparation method and an application thereof. The sulfonated graphene metal salt solid polymer electrolyte includes a sulfonated graphene metal salt and a solid polymer electrolyte, wherein the sulfonated graphene metal salt is prepared by carrying out a reaction of a part of sulfonic acid in sulfonated graphene with a metal compound; the solid polymer electrolyte is selected from polyhydroxyl polymer; the sulfonated graphene metal salt and the solid polymer electrolyte are combined by carrying out a reaction of a part of sulfonic acid in sulfonated graphene with a part of hydroxyl in the solid polymer electrolyte. The sulfonated graphene metal salt solid polymer electrolyte has the advantages of relatively high ionic conductivity, relatively wide electrochemical window and good chemical and electrochemical compatibility with an electrode material, and has wide application prospects in lithium ion batteries, super capacitors and other electrochemical / physical energy storage devices; and the preparation technology is simple, easy to implement, regulate and control, mild in reaction conditions, wide in raw material sources, and convenient for large-scale production.

The invention discloses a method for preparing a nanocrystal lithium iron phosphate anode material through co-precipitation, which comprises the following steps of: 1, mixing crude materials, and stirring at high speed to obtain a precursor solution; 2, standing the precursor solution, cleaning, filtering and drying to obtain precursor powder; 3, adding an organic carbon source into the precursor powder and uniformly blending, and drying obtain the precursor powder which is coated by the organic carbon source; 4, roasting and cooling to obtain the organic carbon-coated nanocrystal lithium iron phosphate anode material; 5, mixing an inorganic carbon source with an anode material, adding adhesive and uniformly stirring to obtain an anode sizing agent; and 6, coating the anode sizing agent onto an aluminum foil substrate, drying and pressing to obtain a carbon-coated nanocrystal lithium iron phosphate anode material. With the adaption of the carbon-coated nanocrystal lithium iron phosphate anode material prepared by the method disclosed by the invention, assembled button half-cells have excellent chemical properties. The first discharge capacity achieves 155 mAh / g to 165 mAh / g at 0.1C; and a discharge platform is flat and about 3.4 V.

The invention belongs to the technical fields of nano materials and electrochemistry, and particularly relates to a metal organic framework material CuBDC nano sheet and a preparation method thereof (herein BDC is 1,4-dicarboxylic benzene). The material can be used as a sodium ion battery anode material and is formed by stacking a plurality layers of the CuBDC nano sheets, wherein thickness of single nano sheet is 15-25 nm and the side width of the nano sheet is 3-7 [mu]m. The nano sheet has a porous structure of which the BET specific surface area is 530-550 m<2> / g and the pore size is less than 2 nm, wherein the porous structure belongs to microporous structure. The metal organic framework material CuBDC nano sheet has uniform morphology and has excellent electric-conductive performance; when being used as the sodium ion battery anode material, the material has excellent rate, high specific capacity and excellent circulation stability. The material has simple process, is economical, satisfies requirement of green chemistry and is easy to commercially promote.

The invention discloses a silicon fluoride self-cleaning glass nano-material, which is composed of solvent and active ingredients; the active ingredients are fluorinated modified silicone nano-particles, and the reaction raw materials comprise ortho-silicon ester and fluorine modified alkyl silane, with the ratio volume and dosage reaching 1.5-3:0.15-1.8. The invention also discloses a manufacturing method for the silicon fluoride self-cleaning glass nano-material, comprising two steps: synthesizing the surface modification of silica nano-particles, silica nano-particles; the ratio between volume and dosage for each added reactant is as follows: solvent: water: ortho-silicon ester: fluorine modified alkyl silane equals to 100: 1.5-3: 1.5-3: 0.15-1.8. The invention has simple production process, stable product performance, higher storage stability, excellent chemical properties, low surface energy and good tolerance against pollution, which is used for glass surface treatment; the contact angle between water and coating is greater than 110 degrees.

The invention discloses a polymer for a lithium ion battery, a preparation method of the polymer, a lithium ion battery gel electrolyte and a preparation method thereof. The polymer is characterized by being prepared by crosslinking of raw materials including polyvinyl alcohol, anhydride and isocyanate under action of auxiliaries, and the auxiliaries include initiator and assistant auxiliary. Compared with conventional lithium ion batteries, the lithium ion battery has the advantages that liquid retaining capability is improved greatly, liquid leakage can be prevented effectively, dangers such as explosion and burning caused by liquid leakage are avoided, and safety coefficient is high.

The invention discloses a Chinese medicinal herb residue bio-organic fertilizer, and belongs to the technical field of organic fertilizers. The Chinese medicinal herb residue bio-organic fertilizer is prepared from the following raw materials in parts by weight: 180 to 400 parts of Chinese medicinal herb residue, 60 to 70 parts of chicken manure, 50 to 60 parts of egg shell, 70 to 90 parts of crop straw, 50 to 80 parts of soil conditioner, and 0.2 to 0.6 part of cellulose decomposition bacteria. The Chinese medicinal herb residue is mixed with agricultural waste such as the chicken manure, a mixture is fermented through the cellulose decomposition bacteria, the soil conditioner is added, and granulation is performed to obtain the bio-organic fertilizer, so that the damage of a chemical fertilizer to soil is avoided, physical, chemical and microbial reactions of the soil can be improved, the fertility of the soil is enhanced, and the quality and yield of crops are improved and increased.

The invention discloses a preparation method for a supercapacitor material MoO2 / graphene / g-C3N4, and belongs to the technical field of composite material preparation. The method comprises the following steps: 1), scattering oxidized graphene into deionized water, employing a cell pulverizer for smashing, adding mixed solution composed of a molybdenum salt precursor and an end-capping reagent, carrying out the stirring of the mixed solution, enabling the mixed solution to be uniform, and obtaining an oxidized graphene-molybdenum salt-sodium salt mixed solution system; 2), adjusting pH value andthen carrying out the hydro-thermal reaction in a reaction still; 3), employing water and ethyl alcohol for cleaning, carrying out the low-temperature vacuum drying, and obtaining an MoO2 composite oxidized graphene material; 4), mechanically mixing the MoO2 composite oxidized graphene material with a carbon and nitrogen precursor, carrying out the high-temperature calcination of the mixture under the protective atmosphere of high temperature argon gas, cooling the mixture to the room temperature, and then obtaining the MoO2 / graphene / g-C3N4 composite material. The method is simple and feasible, and is low in cost. The specific capacity of an obtained composite material supercapacitor is remarkably enlarged, and the composite material supercapacitor is good in cyclic charging and discharging stability.

The invention belongs to the field of technologies for preparing environment functional materials, and particularly discloses a method for preparing carbon foam adsorbents modified by phenylboronic acid type metal organic framework materials. The method includes synthesizing high-temperature-resistant high-internal-phase materials; calcining the high-temperature-resistant high-internal-phase materials in a tube furnace to obtain carbon foam; soaking carbon foam materials in zinc ion solution; adding an organic ligand (terephthalic acid) and a ligand fragment (3, 5-dicarboxy phenylboronic acid) into the zinc ion solution and carrying out a series of treatment to obtain the adsorbents; applying the adsorbents to selectively recognizing and separating luteolin. The method has the advantages that emulsion imprinted polymer micro-spheres prepared by the aid of the method are high in heat stability, the luteolin can be efficiently adsorbed, and the carbon foam adsorbents have acid-alkali control release performance.

The invention discloses a phenyl modified epoxy organic silicon resin and a preparation method thereof, an organic silicon packaging adhesive and an LED lamp. A molecular structure of the phenyl modified epoxy organic silicon resin is as shown in a general formula 1 in the specification; and in the general formula 1, R1 is CH3 or CH6H5, R2 is CH3 or a repeating chain a, R3 is CH3, C6H5 or the repeating chain a, and R4 is CH3 or C6H5, wherein a is 1-7, b is 0-3, c is 1-4 and n is 1-20. The preparation method comprises the steps as follows: configuring a monomer mixing solution; and carrying out polymerization reaction on the monomer mixing solution. The organic silicon packaging adhesive contains the phenyl modified epoxy organic silicon resin. The LED lamp is packaged by the organic silicon packaging adhesive. The phenyl modified epoxy organic silicon resin has the advantages of excellent high temperature resistance and bond performance due to phenyl groups and epoxy groups.

The invention relates to a cultivation method for edible fungus, in particular to a cultivation method for organic coprinus comatus and a culture medium of the organic coprinus comatus produced by using pure natural raw materials. The cultivation method has the advantages of safety, no pollution, high yield and high-efficiency mushroom production. The culture medium of the organic coprinus comatus comprises major ingredients, auxiliary ingredients, additives and covering soil, wherein the major ingredients, the auxiliary ingredients and the additives are uniformly mixed and then fermented before production; the covering soil is used in a production process; the culture medium is characterized in that the major ingredients comprise cob and cow dung; the auxiliary materials comprise wheat bran, corn flour and meal cake; the additives comprise calcium superphosphate and a biological leavening agent; and the covering soil comprises coarse soil with diameter of 2-3 cm, medium soil with diameter of 1-2 cm and fine soil with diameter of 0.1-1 cm. The cultivation method for the organic coprinus comatus comprises the following five steps of: preparing a bed; inoculating; growing spawn; covering soil; and harvesting; and the cultivation method is characterized in that the culture medium in preparation of the bed is any culture medium.

The invention relates to a probe for pathological diagnosis of a tumor. The probe comprises a gold nano-cluster and an antibody to a tumor specific marker, wherein the gold nano-cluster and the antibody to the tumor specific marker are connected through a click chemistry manner, and a mol ratio of the gold nano-cluster to the antibody is 1:1 to 1: 100. The invention further provides a preparation method for the probe used for pathological diagnosis of the tumor and a kit including the probe. Since the gold nano-cluster has high peroxide mimic enzyme activity, the gold nano-cluster can catalyze reaction of a color developing agent and emit light in a visible light area, thereby realizing visible light positioning of tumor cells; since the gold nano-cluster has near infrared fluorescence characteristics, the gold nano-cluster emits fluorescent light under the action of exciting light, thereby realizing fluorescence localization of the tumor cells. Thus, the probe for pathological diagnosis of the tumor can realize dual positioning of the tumor cells, so the probe has high accuracy in pathological diagnosis of the tumor.

The invention provides a liquid crystal compound and a preparation method thereof as well as a liquid crystal mixture containing the liquid crystal compound and an application of the liquid crystal mixture. The liquid crystal compound has a general formula I as shown in the specification, wherein R1 and R2 are independently selected from one of H, alkyl with 1 to 15 carbon atoms, halogenated alkyl, alkoxy and alkenyl, one or more CH2 radicals in R1 and R2 can be independently substituted by -O-, -S- or -Cis equivalent toC-, and any adjacent two CH2 radicals can not be substituted by -O-O-; n1, n2, n3 and n4 are independently selected from 0 or 1, and at least one of n1 and n4 is 1; any one of X1, X2, X3 and X4 is F, and the others are H. The liquid crystal compound has good chemical, thermal and light stabilities; the addition of cyclopentyl can improve the ratio of a macroaxis to a brachyaxis of the liquid crystal compound and the value of degree of order S of the liquid crystal compound to ensure that the liquid crystal compound has a nematic phase with a wide temperature range and a high elasticity coefficient K.

The invention provides a liquefied gas hydrogenating, olefin content decreasing and desulfurizing catalyst and a preparation method thereof. The catalyst comprises a carrier and activated substances, the carrier adopts F-modified Al2O3-TiO2 composite oxides, activated substances comprise molybdenum, nickel and cobalt, the molybdenum is a main component, and the nickel and the cobalt are auxiliary components. The preparation method of the catalyst comprises a process for preparing a modified Al2O3-TiO2 compound oxide carrier and a process for preparing the liquefied gas hydrogenating, olefin content decreasing and desulfurizing catalyst by a co-impregnation method. The liquefied gas hydrogenating, olefin content decreasing and desulfurizing catalyst has the advantages of double functions of resisting to sulfur-poisoning and hydrogenating, olefin content decreasing and desulfurizing of a traditional molybdenum catalyst, simultaneously, low-temperature and low-pressure activity is good, deeply hydrogenating saturability is high, and activity is stable.