54results about How to "With performance" patented technology

The invention belongs to the technical field of lithium-sulfur batteries and in particular relates to a composite membrane of a lithium-sulfur battery. The composite membrane is a negative ion type composite multi-stage porous diaphragm and comprises a mixture of a negative charge ionization polymer and a lithium ion conduction polymer, wherein the composite multi-stage porous diaphragm has a macropore channel structure of 50 nanometers to 2 microns; micropores of 1-50 nanometers are formed in the side walls of macropore channels; the porosity is 50%-80%; macro pores account for 40%-70% of all pores and the rest pores are micropores. The composite multi-stage porous diaphragm provided by the invention has the characteristics and the beneficial effects that the macro pores of the composite membrane are good in electrolyte solution absorption and storage capacity, and the micropores are connected with the macro pores, so that the conduction of lithium ions can be facilitated; polysulfide negative ions can be excluded under the charge effect of the composite membrane material to a certain extent, so that the shuttle effect is inhibited, the loss of active substances is reduced, and the battery efficiency and stability are improved.

The invention relates to a fire retardant coating for a steel structure surface of a nuclear power plant. The fire retardant coating consists of components A, B and C at a weight ratio of (4-6): 1: 1, wherein the component A is a mixture composed of 15-35 parts of epoxy resin, 2-10 parts of reactive diluent, 5-15 parts of dehydration catalyst, 10-30 parts of carbonizing agent, 5-20 parts of foaming agent, 15-35 parts of fire retardant, 5-15 parts of smoke inhibitor, 10-30 parts of pigment and filler and 2-10 parts of auxiliaries; the component B is a mixture composed of 10-50 parts of toughened resin, 10-30 parts of pigment and filler and 2-10 parts of auxiliaries; the C component is an amine curing agent; and the toughened resin in the component B is hyper-branched polyester resin with a terminal carboxyl group. The fire retardant coating disclosed by the invention is more excellent than a normal intumescence fire retardant coating in binding strength, freezing and thawing cycle resistance, acid and base resistance, and fire retardant limit, and is specifically up to fire resistance requirements of the steel structure surface of the nuclear power plant.

The invention provides a composite nano-grade novel material based on cancer early-stage integrated detection, diagnoses, and treatment, and a preparation method thereof. According to the invention, gold nano-cage (gold nano-box) and nano-grade iron oxide are assembled, such that gold nano-cage (box) / nano-grade iron oxide composite particles are synthesized. With an assembling method from the inside to the outside, the gold nano-cage (box) is first prepared; iron oxide is nucleated and grown in the gold nano-cage (box); with a surfactant (such as glucan or the like), mono-dispersed iron oxide is obtained; the iron oxide is packaged by using biological molecules, such that the gold nano-cage (box) / nano-grade iron oxide composite particles are obtained; surface modification is carried out by using biological targeting molecules (antibodies or DNA molecules). The material is used in tumor magnetic resonance imaging, fluorescence imaging, dark field imaging, specific targeting multifunctional diagnosis, and photothermal therapy. The material can also be used as a targeting medicine carrier.

The invention relates to a fireproof anti-ultraviolet anti-static ABS material and a preparation method thereof. The preparation method comprises the following steps: weighing the following raw materials: 25 to 71 weight percent of ABS, 20 to 45 weight percent of AS, 5 to 15 weight percent of fire retardant, 2 to 10 weight percent of synergist, 1 to 5 weight percent of antistatic agent, 0.1 to 3 weight percent of lubricating agent, 0.1 to 1 weight percent of antioxidant and 0.1 to 1 weight percent of light stabilizer; adding 0 to 0.3 weight percent of white oil into the raw materials, putting the mixture into a high mixing machine to mix for 2 to 5 minutes and discharging; carrying out extrusion granulation on the discharged mixture by a double-screw extruder to obtain a product, wherein the cylinder temperature of the double-screw extruder is between 190 and 250 DEG C and the rotating speed of screws is between 180 and 600 revolutions per minute. Compared with the prior art, the ABS material of the invention has outstanding impact resistance, high glossiness, mouldability and chemical resistance and can meet testing standards of a safety helmet (GB 2811 / GB 2812).

The invention provides a manufacturing method of a composite integrated sensor structure. The method comprises the following steps of: providing a substrate and forming a doped region on the substrate; etching the substrate to form a trench for manufacturing a cavity; depositing a barrier layer on the surface of the substrate and the side wall and the bottom of the trench; removing the barrier layers on the surface of the substrate and the bottom of the trench and forming a side wall protection layer on the side wall of the trench; continuously etching the trench under combined action of a hard mask on the substrate and the side wall protection layer to form a deep trench; corroding the deep trench and forming the cavity in the substrate; filling an isolating material and / or a filling material between the side wall protection layers of the trench to form a plug structure to isolate the cavity from the exterior; planarizing the surface of the substrate; manufacturing a conductive lead and an electrode on the surface of the substrate; depositing a mass block at the region of an acceleration sensor and patterning the mass block; and forming an isolating trench around the mass block and connecting the mass block with the substrate in a cantilever mode. In the invention, a front process which is compatible with the conventional semiconductor process is adopted; and the manufacturing method has the advantages of practicability, economy, high performance and the like.

The invention relates to Ni / TiO2-based electromagnetic rheological liquid with electromagnetic coupling effect and a preparation method thereof. The dispersed phases of the electromagnetic rheological liquid are composite particles which are respectively in a core-shell structure, wherein nano-metallic conductive particles (Ni) are taken as a core, titanium dioxide (TiO2) is taken as a coating shell, and the composite particles are modified by polar molecules. The preparation method comprises the following steps: preparing nano-nickel particles by using a physical method, wherein the particlediameter is 30-200nm; carrying out hydroxylation treatment on the nano-nickel particles to obtain particles A; coating TiO2 on the particles A to obtain particles B; carrying out heat treatment on the particles B to obtain Ni / TiO2 composite particles or coating urea and SDBS polar molecules at the outer layers of the particles B to obtain particles C; carrying out heat treatment on the particles C to obtain Ni / TiO2 / Urea and Ni / TiO2 / SDBS composite particles; and dispersing the composite particles into the basic liquid to obtain the electromagnetic rheological liquid in which the volume concentration of the composite particles is 10-50%. The preparation method of the invention is simple and can be operated easily; a sol-gel method and a controllable molecule synthesizing technology are adopted; and the prepared electromagnetic rheological liquid not only has the properties of the electro-rheological liquid but also has the properties of the magneto-rheological liquid.

The invention discloses a polypropylene material for automobile interior trimming parts and a preparation method of the polypropylene material. The polypropylene material for automobile interior trimming parts comprises the following components in part by weight: 30-80 parts of polypropylene, 5-10 parts of ethylene propylene terpolymer and 10-25 parts of talcum powder. The polypropylene material can be prepared just through weighting each raw material in certain proportion; after the raw materials are uniformly mixed, carrying out fusing and mixing on the obtained mixture; and carrying out extruding and granulation to obtain the polypropylene material. Through mixing the polypropylene with the ethylene propylene terpolymer, the toughness and cold resistance of the polypropylene material can be improved, and the polypropylene material is good in ozone resistance, oxidation resistance and erosion resistance; meanwhile, the polypropylene material has a shockproof effect; and after the talcum powder is added, the friction coefficient of the polypropylene material can be reduced, and the self lubricity of the polypropylene material can be improved. The polypropylene material for automobile interior trimming parts disclosed by the invention has the appearance and performance of a rubber body; and the polypropylene material can be prepared into automobile interior trimming parts suchas outer side plates for driver seats, small cover lids, inner plates of side plates, plastic parts for inner side plates, outer side plates for passenger seats, door-sheet armrest frames and door trimming plates and the like through an injection molding process.

The invention discloses a novel chemical milling protective coating, which is a single-component coating comprising a thermoplastic elastomer, a pigment, a filler, an aid, a solvent and the like. The coating can be dried at normal temperature and also can be dried at a low temperature; and a film is level and uniform, and has a certain adhesive force and better physical and mechanical properties. Meanwhile, the coating has high chemical corrosion resistance and peeling performance, is mainly used for chemical milling of an aluminum alloy, a titanium alloy, stainless steel and the like, processing of high-hardness metals, anodizing of the aluminum alloy, electroplating, etching processing temporary protection of artistic products with complex technology and the like, and also can be used for chemical corrosion-resistant shielded protection of coated object surfaces or used as temporary protection coatings for preventing scratches and bruises on surfaces of instruments and mechanical equipment.

The invention discloses a biodegradable straw and a preparation method thereof, and relates to the field of biodegradable materials. The biodegradable straw is prepared from the following raw materials in parts by mass: 100 parts of aliphatic polyester resin, 0-50 parts of filler, 0.5-5 parts of compatilizer, 0.5-3 parts of chain extender, 0.01-0.5 part of initiator, 0.5-3 parts of grafting monomer, 1-3 parts of lubricant and 0.3-0.6 part of antioxidant, wherein the aliphatic polyester resin is PBS, PBAT, PLA or a mixture of PBS, PBAT and PLA. The preparation method comprises the steps of preparing a required filler and a compatilizer, placing the filler and the compatilizer in a high-speed mixer for mixing, and discharging the mixture; and adding the mixture into a continuous internal mixer for internal mixing, enabling the mixture to fall into a conical double-forced feeding machine to be fed into a double-screw extruder for granulation to obtain required formula granules, extrudingthe required formula granules into a pipe through the extruder, and cutting the pipe to obtain the straw. The straw can be completely biodegraded after being discarded, has the using performance similar to that of a polypropylene straw, and is cold-resistant and heat-resistant. The method is suitable for industrial production and low in cost.

Provided is a method for manufacturing a composite integrated sensor structure, including the steps of: providing a substrate and forming a doped region thereon; etching the substrate to form a groove for making a cavity; depositing a barrier layer on the substrate surface and the groove side-wall and the groove bottom; removing the barrier layer from the substrate surface and the groove bottom, and forming side-wall protection layers on the groove side-wall; the hard mask on the substrate and the side-wall protection layers interacting with each other to continue etching the groove to form a deep groove; corroding the deep groove to form a cavity inside the substrate; filling in an isolation and / or filling material between the side-wall protection layers of the groove to form a plug structure so as to isolate the cavity from the outside; flattening the substrate surface; making an electrically conductive lead and an electrode on the substrate surface; depositing a mass block in the region of an acceleration transducer and imaging same; and forming an isolation groove around the mass block, the mass block being connected to the substrate in a cantilevered manner. The present invention adopts a process which is positive and compatible with the conventional semiconductor process and has the advantages of being practical, economical, high-performance and the like.

The invention discloses anti-ageing PP / HDPE (Polypropylene / High-Density Polyethylene) plastic for an automobile interior and a preparation method thereof. The automobile interior is applied to PP / HDPE plastic, and comprises the following components in parts by weight: 100 parts of PP, 20-30 parts of HDPE, 10-20 parts of ethylene propylene diene monomer and 0.1-5 parts of anti-ageing agent. The method comprises the following steps of: weighing raw materials according to a certain proportion; mixing uniformly; melting and compounding; and extruding and pelletizing to obtain the PP / HDPE plastic. The anti-ageing PP / HDPE plastic for the automobile interior has rubber body appearance and performance, high tensile strength, high flexural modulus and high cantilever beam gap impact strength, and can be easily processed into automobile interiors of various shapes through an injection molding process such as glove box inner cover plates, glove box hoppers, auxiliary instrument board bodies, storage box liners and panel storage boxes.

The invention discloses an environment-friendly refrigeration composition. The environment-friendly refrigeration composition is prepared from, by molar percent, 50-70% of fluoromethane and 30-50% of a second component selected from one or two or three of trans-1,3,3,3-tetrafluoropropene, 2,3,3,3-tetrafluoropropene and f-methyl methyl ether; the boiling point of the refrigeration composition is -50--75 DEG C, and the GWP value is smaller than or equal to 300. The refrigeration composition is low in GWP value, excellent in refrigeration performance, low in flammability, high in safety and suitable for replacing HFC-23 for refrigeration.

The invention relates to a reinforcing structure and a preparation of the reinforcing structure, and a liquid crystal screen assembly and a preparation method of the liquid crystal screen assembly. The reinforcing structure comprises a reinforcing glass (1), a polarizer (4), a CF (color filter) glass substrate (3) and a TFT (thin film transistor) glass substrate (2) which are sequentially overlapped, wherein the CF glass substrate and the TFT glass substrate form a first-stage step, the length of the CF glass substrate is smaller than the length of the TFT glass substrate, foam (5) covers the first-stage step, the polarizer and the CF glass substrate form a second-stage step, the length of the polarizer is smaller than the length of the CF glass substrate, a light shielding adhesive tape (6) covers the second-stage step and the foam, and the reinforcing glass is adhered to the surface formed by the light shielding adhesive tape and the polarizer through an optical adhesive (7). The reinforcing structure has the advantages that firstly the foam is filled in a gap, the foam is drawn out in the subsequent period, and the optical adhesive is subjected to ageing treatment; as the usage amount of the optical adhesive is reduced, the deformation after heating is smaller, and the product quality is improved.

The invention relates to a PBT (Poly Butylenes Terephthalate) bamboo-charcoal elastic fiber belonging to the technical field of chemical fibers. The production method of the PBT bamboo-charcoal elastic fiber comprises the following steps of: drying and mixing bamboo-charcoal functional mater batch and PBT slices as raw materials, extruding the mixture into silks by using a screw rod-fused spinning board, carrying out winding formation, and then carrying out drawing elasticization by adopting an elasticizer to produce the differentiated bamboo-charcoal fiber meeting market demands.

The present invention is one kind of airflow netting and hydro entangling product and its production process and apparatus. The product has structure of at least two layers and includes at least one layer of web of super short down fiber and at least one layer of non-woven short fiber web. The production process includes longitudinally superposing super short down fiber web and non-woven short fiber web and hydro entangling to form composite fiber web structure; drying and winding to form the airflow netting and hydro entangling product. The production apparatus include one frame, at least one down slurry web forming device, at least one short fiber web forming device, at least one hydro entangling device, at least one dewatering device, at least one drying device and one finishing and winding device.

The invention relates to a method for suppressing shuttle flying of polysulfide ions in a lithium-sulfur battery. A complexing agent is added to a negative electrode electrolyte or a positive electrode of the lithium-sulfur battery; by forming a polysulfide ion complex in the negative electrode of the lithium-sulfur battery, diffusion speed of the polysulfide ions can be lowered and diffusion speed to the negative electrode can be lowered; the complex is formed by the complexing agent and the polysulfide ions in a compounding manner; and the complexing agent can be a nitrogen element-containing organic compound. The complexing agent does not affect the electrochemical activity of the polysulfide ions and the dissolving deposition reaction of the metal lithium in the negative electrode; and meanwhile, generation of a secondary reaction between lithium polysulfide and a lithium sheet can be blocked, and the effect of the metal lithium can be protected.

The invention relates to a device and a method for multi-channel temperature calibration. The method comprises the steps that: a calibration personnel controls an upper computer, and when a set temperature value is reached, a temperature indicating value of a calibrated sensor A1 and indicating value data of a temperature standard meter at the same time are uploaded to the upper computer; after aset time S1 arrives, a central processor of a multi-channel temperature module controls a plurality of pairs of double-pole double-throw relays to switch off, a channel interface T2 end is conducted by switching on double-pole double-throw relays A1, and a temperature indicating value of a calibrated sensor A2 and indicating value data of the temperature standard meter at the same time are uploaded to the upper computer, so as to complete calibration of the calibrated sensors in sequence; the obtained data is compared according to rules, a calibration certificate is generated according to thesensor determined to be qualified, and the calibration certificate is printed, output and uploaded to a server; and for the sensor determined to be unqualified, the calibration personnel switches theunqualified calibrated sensor to a current data acquisition state through manually switching buttons for reexamination and debugging. The invention can simultaneously realize the verification work ofthe 8-way tested temperature sensor and improve the verification efficiency. The device and the method can realize the calibration of 8 channels of tested temperature sensors, and improve the calibration efficiency.

The invention relates to a high-robustness communication network for dual backup of an optical network and a wireless Mesh network. The high-robustness communication network comprises a dual backup transmission node arranged on a network layer of an OSI seven-layer model. The dual backup transmission node comprises a connection processing module which is used for being connected with an optical fiber and capable of forming the optical network. The connection processing module can be matched with a wireless Mesh network module in the dual backup transmission node to form an optical and wireless Mesh dual backup network. After the optical fiber is connected with the connection processing module, the optical network and the wireless Mesh network are formed simultaneously through the dual backup transmission node. When an interface monitoring module in the dual backup transmission node monitors that the optical network is normal, the connection processing module selects the optical network for data transmission, and otherwise the connection processing module selects the wireless Mesh network for data transmission. According to the high-robustness communication network, backup support can be provided for the optical network through the wireless Mesh network, the robustness of the whole network is improved to a great extent, and the network is wide in application range, safe and reliable.

The invention belongs to the technical field of functional materials, and in particular relates to a method for preparing a crosslinked elastomer capable of being reprocessed by utilizing transamination. A dynamic exchange reaction based on the transamination of the method makes the crosslinked elastomer have reprocessability; and the method comprises the following steps: firstly, through a thiol-ene ''click'' chemical modification method, a reaction of thiol and double bonds in an unsaturated elastomer is utilized to introduce hydroxyl; secondly, the introduced hydroxyl is further modified into acetoacetyl; and finally, a polyamine compound is added as a crosslinking agent to form a chemically-crosslinked network structure. According to the method disclosed by the invention, since an m-vinyl carbamate bond formed by a reaction of amino with the acetoacetyl can be subjected to transamination under certain conditions, the prepared crosslinked elastomer has reprocessability; and the method has very good practical value in the recovery and reuse process of elastomers.

The invention discloses a halogen-free flame-retardant polypropylene material and a preparation method thereof. The halogen-free flame-retardant polypropylene material is prepared from, by weight, 69-87.5 parts of polypropylene, 10-20 parts of expanded flame retardant, 1-5 parts of zirconium phosphate, 1-3 parts of expanded graphite, 0.3-2 parts of thermostabilizer and 0.2-1 part of white oil. Byadding zirconium phosphate and expanded graphite, flame-retardant performance can be improved, so that adding amount of the flame retardant is reduced greatly, and control of cost and maintaining of product performance are facilitated. The halogen-free flame-retardant polypropylene material is rich in raw material source, needless of modification treatment, simple in production process and easy for large-scale production.

The invention discloses screw spike anchoring mortar which is prepared from the following components in parts by weight: 20-40 parts of sulphoaluminate cement, 25-75 parts of dry sand, 0.5-0.8 part ofa reinforcing agent and 5-10 parts of a mixture. Compared with ordinary Portland cement, the screw spike anchoring mortar provided by the invention has the advantages that the setting time is shorter, the compressive strength reaches 30 MPa or above within 1-2 hours, the construction efficiency and quality are improved, and the pulling strength of a railroad sleeper is met.

The invention discloses a toilet seat and a preparation method thereof. The seat comprises a thermosetting resin seat body, and a heating assembly is embedded in the seat body. The method includes the following steps that 1, thermosetting particles and two mold sets with upper molds and a lower mold are provided, wherein the two mold sets share the lower mold; 2, the first layer of urea formaldehyde particles are laid in the first mold set of a compression molding machine, the first upper mold is closed for forming, and then the first upper mold is opened and moved away; 3, the heating assembly is laid on the seat with first forming; 4, the second layer of the urea formaldehyde particles are laid on the heating assembly and the seat with first forming; 5, the second upper mold is closed, and forming is conducted through compression molding. According to the toilet seat and the preparation method, the production method is simple, and the product is beautiful and safer.

The invention discloses compostable full-degradable disposable tableware and a preparation method thereof, which relate to the field of biodegradable materials. The compostable full-degradable disposable tableware is prepared from the following raw materials in parts by mass: 100 parts of aliphatic polyester resin, 0-40 parts of filler, 0.5-5 parts of compatilizer, 0.5-5 parts of chain extender, 0.01-1 part of initiator, 0.5-3 parts of grafting monomer, 1-4 parts of lubricant and 0.3-0.6 part of antioxidant. The preparation method comprises the following steps of preparing a required filler and a compatilizer, putting the filler and the compatilizer into a high-speed mixer for mixing at the temperature of 50-90 DEG C for 10-30 minutes, and discharging, adding the mixture into a continuousinternal mixer, carrying out internal mixing at 90-140 DEG C for 2-3 minutes, dropping the mixture into a conical double-forced feeding machine, and feeding the mixture into a double-screw extruder for granulation, so as to obtain required formula granules, pressing the mixture into sheets by a sheet machine at 120-180 DEG C, and carrying out plastic molding as required to obtain a finished product, or directly carrying out injection molding on the formula granules through an injection molding machine.

The invention relates to a recovery device for magnetic abrasive particles which comprises a support, a sliding mechanism, an electromagnet, a flushing pool and a screening mechanism, wherein the flushing pool and the screening mechanism are arranged in the support, the sliding mechanism is arranged on the support, and the electromagnet is driven by the sliding mechanism to slide between the flushing pool and the screening mechanism. The sliding mechanism comprises a transverse sliding rail, a sliding plate, a first lead screw mechanism driving mechanism, a supporting base, a sliding block anda second lead screw mechanism driving mechanism. The transverse sliding rail is arranged on the support, the sliding plate is driven by the first lead screw driving mechanism to transversely slide onthe transverse sliding rail, the sliding plate is fixedly connected with the supporting base, a sliding groove is formed in the supporting base, the sliding block is slidably connected in the slidinggroove, and the sliding block is driven by the second lead screw driving mechanism to slide up and down in the supporting base. The magnetic abrasive particle recycling device is used for recycling and reusing waste magnetic abrasive particles which still have use performance aiming at the magnetic abrasive particles prepared by a sintering method.

The invention relates to protection and storage of archive information and in particular relates to a built-in protection type personnel archive box. The built-in protection type personnel archive box is characterized by comprising a box body and an insertion box, wherein the box body is divided into two regions; one region is an optical disc and bulk material storage region, and the other region is an information folder storage region; a concave channel is arranged on each of two sides of the top of the information folder storage region, and a fixed slot is formed in the bottom of the information folder storage region; the insertion box is a trapezoid with an upper wide part and a lower narrow part; convex slots are formed in two sides of the upper part of the insertion box; a small hole is formed in the bottom of the insertion box; the convex slots are inserted into the concave channel to be inserted into the box body of the archive box; an insect-resist agent, a drying agent and a bactericide are arranged in the insertion box. According to the built-in protection type personnel archive box, an information folder for clamping the archive information and the optical disc as well as the bulk material are respectively stored in the two independent regions, and the information folder in the box can be fixed; storage and protection of the archive information in the unit archive box can be realized; the built-in protection type personnel archive box is simple in design, convenient to use, easy to produce and manufacture, low in cost and favorable for popularization and application.

The present invention is an electro-optical device having high aperture ratio, with which it is possible to easily planarize an insulating film stacked over a switching element, a wiring and an insulating film constituting the electro-optical device. The solution is to have an electro-optical device including a substrate 2, a switching element 5, a wiring 36 and an insulating film 21, 55 provided for the substrate 2. The substrate 2 comprises concave portions 10, 11, 12 corresponding to at least one position of the switching element 5, the wiring 36 and the insulating film 21, 55.

The invention relates to a polymer dispersion liquid and application thereof. The dispersion liquid consists of a solvent, a lithium salt and a polymer, wherein the polymer is dispersed into the solvent in a molecule form, and comprises one or more than two of polydioxolame, polyethylene glycol, polyvinylidene fluoride, polymethylsiloxane and styrene fat olefin copolymer. The preparation method ofthe polymer dispersion liquid is simple, controllable in polymer content and adjustable in polymer type, and large-scale production is realized easily. According to the prepared polymer dispersion liquid, the mechanical stability of the cathode interface film (SEI) of a lithium battery is improved, the crushing and falling of the interface film are prevented effectively through flexibility, and the cycle life of the lithium battery is prolonged greatly.

The invention discloses a method for preparing p-phenylene terephalamide pulp from short cut p-phenylene terephalamide waste fibers through pre-treatment and combined beating. The method comprises: pretreating the short cut p-phenylene terephalamide waste fibers with a 2 to 50 percent swelling agent at 20 to 60 DEG C for 1 to 24 hours first, wherein the bath ratio is (5-50):1; and then subjectingthe pretreated short cut p-phenylene terephalamide waste fibers to body fluid exhaustion and washing, preparing a suspension of fibers with a pulp mass concentration of 0.25 to 3 percent with the short cut p-phenylene terephalamide waste fibers, and beating by a two-stage combined bearing process of a trough-style pulp beater to obtain the p-phenylene terephalamide pulp. The method is characterized by taking the short cut p-phenylene terephalamide waste fibers as a raw material, using the swelling agent to pretreat the short cut p-phenylene terephalamide waste fibers, preparing the p-phenylene terephalamide pulp by the two-stage beating process, shortening time for beating, improving the added value of p-phenylene terephalamide waste fibers and preparing the p-phenylene terephalamide pulpwith excellent performance.

The invention relates to a composite reduced chromium vanadium catalyst and a preparation method thereof, comprising an active component and an inorganic carrier, the active component being a mixture of vanadium metal compound and chromium metal compound, the inorganic carrier being an inorganic oxide, and the reducing agent being an organic Mixture of metal compounds. The preparation method of the composite reduced chromium vanadium composite polyethylene catalyst of the present invention, the chromium vanadium catalyst has the characteristics of high activity, wide molecular weight distribution or bimodal bimodal distribution of the polyethylene product obtained by polymerization, good catalytic activity of the inventive catalyst, and simple preparation process.

The invention relates to a massage back cushion which comprises a cushion body, a neck cushion, a connecting part, massage balls, a fixing belt and a belt buckle, wherein the cushion body is connected with the neck cushion through the connecting part; both the cushion body and the neck cushion are in hollow closed structures, and can be filled with goods; the hollow closed structures comprise inner faces and outer faces; the massage balls are arranged on the inner faces of the cushion body and the neck cushion; the cushion body is provided with the fixing belt; and the belt buckle is arranged on the fixing belt to allow the fixing belt to be disconnected and connected. The massage back cushion is simple in structure, convenient and light, low in fabricating cost, and convenient to use, can be put at a back of a chair directly in a use process, and has the usability of a common back cushion and a massage effect.