134results about How to "Not easy to curl" patented technology

The invention discloses a water soluble copolymer with high viscosity and salt resistance, and a preparation method and an application thereof. The preparation method comprises the steps of: adding acrylamide 20 weight parts, an anionic monomer or / and a cationic monomer 0.1-15 weight parts,, a vinyl polycyclic aromatic hydrocarbon 0.05-4 weight parts,, a surfactant 0.5-90 weight parts,, and deionized water 70-900 weight parts, into a three-neck reaction bottle, adjusting the solution pH to 2.5-9, introducing N2 for 30min, adding an initiator persulfate 0.001-0.2 weight parts, at 20-70DEG C, and reacting for 6-36 hours to obtain a low-molecular weight water soluble copolymer with molecular association ability, high viscosity and salt resistance, which can be used in intermediate-permeability oil reservoir and low-permeability oil reservoir development. An associated water soluble polymer oil displacement agent is obtained by preparing the copolymer into an aqueous solution with copolymer concentration of 0.3-3 g / L and surfactant concentration of 0.01-4 mmol / L, adding into a mixer with a stirring device, and stirring uniformly at room temperature; and the obtained oil displacement agent has high viscosity, salt resistance, temperature resistance and shear resistance, and can be used in intermediate-permeability oil reservoir and the low-permeability oil reservoir development.

The invention discloses a comb-type amphipathicity water-solubility multipolymer and a method for making the same as well as an application. The method is characterized in that: 20 portions of acrylamide, 0.1 to 10 portions of negative ion monomer, 0.5 to 15 portions of at least one of the surface activity macromolecular monomer 4-vinyl benzyl alkylphenol polyoxyethylene ether or / and allyl alkylphenol polyoxyethylene ether and 30 to 600 portions of deionized water are added into a three-necked reaction bulb, the pH value of the solution is adjusted to between 4 and 9, N2 is introduced into the solution for 30 minutes, 0.002 to 0.3 portion of evocating agent sulphate is added at the temperature of between 30 and 70 DEG C to react 12 to 36 hours in order to prepare PABE which is diluted by water to obtain the PABE strong solution; the comb-type amphipathicity water-solubility multipolymer which can viscosify, has salt resistance and the low surface tension as well as the molecular association ability and can be used for the fuel scavenge. The multipolymer is prepared into a water solution with a mass concentration between 0.3 and 3g / L and a surface active agent concentration between 0.01 and 2mmol / L, the water solution is added into a blending container with a stirring device and is stirred evenly at room temperature so that the polymer oil-displacing agent which can viscosify and shear-resistant and has excellent anti-aging performance in a hyperhaline state and at the temperature of 70 DEG C. The PABE has the double function of a tackifier and a macromolecule surfactant. Infinitesimal low molecular surface active reagent is added into the PABE solution, thereby evidently increasing the apparent viscosity of the solution, reducing the surface tension and the oil-water boundary tension of the solution and contributing to improving the recovery ratio.

The invention discloses a copolymer with temperature resistance and water solubility and the preparation method and application thereof, which is characterized in that: 20 portions of acrylic amide, 0.1 to 10 portions of anion monomer or / and cation monomer, 0.05 to 3 portions of fluorine-containing styrene or / and perfluoroalkyl styrene hydrophobic monomer, 0.5 to 60 portions of surface active agent and 50 to 700 portions of deionized water are put into a three-necked reaction bulb; after the solution pH is regulated to be equal to 2.5 to 9 and N2 is connected for 30 minutes, 0.001 to 0.2 portion of an evocating agent of persulfate is added under temperature of 20 to 70 DEG C, reacting for 6 to 36 hours, and PATF is prepared. Then water is used for diluting so as to prepare PATF concentrated solution, thus obtaining a copolymer that has medium molecular weight and water solubility, is high-temperature resistant, has an ability of molecular association and can be used in high temperature and high salinity reservoir. The copolymer is prepared into aqueous solution with a mass concentration of 0.3 to 3g / L and a surface-active-agent concentration of 0.01 to 4mmol / L, which is put in a blending container with a dasher and is stirred even at room temperature to prepare a polymer oil-displacing agent which is high-temperature resistant, high tackifying and anti-sharing and has excellent aging resistance under high salinity and the temperature of 110 DEG C. The prepared oil-displacing polymer has excellent solution properties owing to the supermolecular structure formed by the association between molecules of fluorine-containing cinnamene or / and alkylbenzene hydrophobic groups, thus having favorable application prospects in high temperature and high salinity reservoir exploitation.

The invention discloses a method for preparing an ultra-thin broad-width polytetrafluoroethylene oriented film. The polytetrafluoroethylene oriented film is prepared by the following technical measures: screening raw materials, prepressing to make preform, sintering at a high temperature, turning to form films, rolling to orient and the like. The thickness of the oriented film is from 5 mu m to 50 mu m, and the width is more than 200 mm. The oriented film can be used as high-grade insulating pads, protecting sleeves, abrasion reducing materials, chemical industrial antiseptic materials and the like in the electromechanical and electronic industries and can be used for a long time at a temperature of between 200 DEG C below zero and 250 DEG C.

The invention provides a polyene microporous multilayer diaphragm and a manufacturing method thereof. The diaphragm is formed by combing three or more than three polyene layers, wherein in a plurality of polyene layers, at least one polyene layer is a polyethylene layer, and at least one polyene layer is a polypropylene layer; the polyethylene layer and the polypropylene layer are tightly attached to each other; and in adjacent polyethylene and polypropylene layers, at least one layer is a polymer blend layer which contains a certain amount of ethylene-propylene copolymer. The invention has the advantages that: in the integrated structure of the polyene microporous multilayer diaphragm, the properties of porosity, puncture strength, pore size, ventilation ratio, tensile strength, breaking elongation and the like are also identical to the high properties of a single-layer diaphragm; simultaneously, the defects of the single-layer diaphragm is overcome, namely the safety of the diaphragm is improved.

The invention discloses a method for preparing an allyl surface-active macromonomer, which is characterized by comprising the following steps: adding 20 portions of alkylphenol polyoxyethylene ether (CmH2m+1-C6H4-O-(CH2CH2O)nH, n is equal to 1 to 60, and m is equal to 1 to 20), 10 to 900 portions of solvent and 0.1 to 15 portions of catalyst into a three-mouth reaction flask with a reflux condensation device, and reacting the mixture for 1 hour under stirring at the room temperature; increasing temperature to 30 to 95 DEG C, adding 0.5 to 20 portions of allyl chloride into the reaction product, and continuously reacting for 6 to 48 hours; distilling the reaction product under reduced pressure to remove the solvent so as to obtain a crude product; and performing silica gel column chromatographic separation to obtain allyl alkylphenol polyoxyethylene ether with the yield of 70 to 95 percent. The allyl alkylphenol polyoxyethylene ether has excellent surface activity, and can be directly used as a surfactant. A water-soluble copolymer synthesized by taking the allyl alkylphenol polyoxyethylene ether as a surface-active macromonomer has the function of tackifying, or reducing solution surface tension and water-oil interfacial tension, and can be taken as a tackifying copolymer or a macromolecular surfactant for improving the oil recovery ratio.

The present invention relates to a plastic pencil, which comprises a pencil rod, a pencil core and a pencil skin, wherein the components of the pencil rod comprise 30-50 wt% of polystyrene (PS), 10-30 wt% of a synthetic rubber, 2-8 wt% of a nucleating agent, 30-50 wt% of talc powder, and 5-10 wt% of calcium stearate, and are added with polyethylene (PE), the components of the pencil core comprise 20-50 wt% of polystyrene (PS), 2-10 wt% of an organosilicon polymer, 30-60 wt% of graphite powder, 2-10 wt% of hydrogenated palm oil, 2-10 wt% of oleic acid amide, and 5-10 wt% of a synthetic rubber, and the components of the pencil skin comprise 70-90 wt% of polystyrene (PS), 5-20 wt% of color master batch, and 2-10 wt% of hydrogenated palm oil. According to the present invention, the pencil rod and the pencil core are not easily broken, the pencil core has characteristics of good striking degree, good brightness and dreg falling resistance, and the manufacturing cost is low.

The invention discloses a foam glass insulation and photovoltaic decoration integrated panel and a preparation method thereof. The integrated panel comprises an insulation layer and a photovoltaic decoration layer, the insulation layer is a foam glass insulation board and is wrapped by a waterproof rolling material in a sealing way, and the photovoltaic decoration layer comprises a flexible film battery component, a film layer and a coating layer in sequence from inside to outside. The integrated panel has fire resistance, flame-retardant performance and good durability, thermal insulation and photovoltaic power generation can be realized, and the integrated panel complies with green building concepts such as energy conservation, emission reduction and zero power consumption.

The invention relates to a circumcision assembly of a one-time circumcision stapler, and belongs to medical apparatuses and instruments. The circumcision assembly of the one-time circumcision stapler is particularly suitable for being matched with the one-time circumcision stapler for use and comprises a glans penis cover, a knife cushion ring, a visible annular cutting knife, a transparent needle bin sleeve and a transparent needle pushing piece. The glans penis cover is provided with a glans penis cover body. A short tube is arranged on the rear portion of the glans penis cover body, internal threads are arranged inside the short tube, and positioning protrusions are arranged outside the short tube. The knife cushion ring is mounted inside the glans penis cover body, the transparent needle pushing piece is mounted inside the transparent needle bin sleeve, and the visible annular cutting knife is mounted inside the transparent needle pushing piece. The transparent needle pushing piece is provided with a transparent needle pushing piece body, a transparent annular knife mounting hole is formed in the transparent needle pushing piece body, and a positioning tube is arranged on the rear portion of the transparent needle pushing piece body. Positioning grooves are formed in the positioning tube, and the positioning grooves are matched with the positioning protrusions arranged outside the short tube of the glans penis cover. The visible annular cutting knife is in an integrated annular shape, and a knife ring of the visible annular cutting knife is provided with visible windows.

The present invention relates to an apparatus for, and method of, bonding a substantially planar porous sheet material to a porous corrugated sheet material in a continuous process, the apparatus comprising a linear corrugator module (300) comprising a corrugating roller (306); an endless fluted conveyor belt (301) wherein the fluted surface (302) of the conveyor belt intermeshes with the teeth on the corrugating roller; a glue applicator (308); and an endless tensioned belt assembly which holds the planar and corrugated sheets together so a bond is formed between them. The production rate (and therefore the dimensions of the corrugating roll) is governed by the formula RP=DHT / BT, wherein RP is the rate of production in metres / minute; DHT is the distance in metres for which the respective sheets are held together; and BT is the bond time of the adhesive in minutes.

The invention discloses a method for preparing a 4-vinyl benzyl surface-active macromonomer, which is characterized by comprising the following steps: adding 20 portions of alkylphenol polyoxyethylene ether (CmH2m+1-C6H4-O-(CH2CH2O)nH, n is equal to 1 to 60, and m is equal to 1 to 20), 10 to 900 portions of solvent and 0.1 to 15 portions of catalyst into a three-mouth reaction flask with a reflux condensation device, and reacting for 1 hour under stirring at the room temperature; increasing temperature to 30 to 90 DEG C, adding 0.5 to 25 portions of 4-vinyl benzyl chloride into the reaction product, and continuously reacting for 6 to 48 hours; distilling the reaction product under reduced pressure to remove the solvent so as to obtain a crude product; and performing silica gel column chromatographic separation to obtain 4-vinyl benzyl alkylphenol polyoxyethylene ether with the yield of 62 to 94 percent. The 4-vinyl benzyl alkylphenol polyoxyethylene ether has excellent surface activity, and can be directly used as a surfactant. A water-soluble copolymer synthesized by taking the 4-vinyl benzyl alkylphenol polyoxyethylene ether as a surface-active macromonomer has the function of tackifying, or reducing solution surface tension and water-oil interfacial tension, and can be taken as a tackifying copolymer or a macromolecular surfactant for improving the oil recovery ratio.

The invention discloses a two-dimensional titanate nanometer material and a preparation method thereof. The two-dimensional titanate nanometer material comprises a modified protonated titanate film which comprises organic groups and a doped Cr element. Through the doped Cr element which facilitates to broadening absorption bandwidth of the two-dimensional titanate nanometer material, the two-dimensional titanate nanometer material can absorb ultraviolet light and visible light, and greatly improves efficiencies of light absorption and photoelectric conversion, thereby improving photocatalytic efficiency. Meanwhile, through doping of the organic groups which are relatively large molecules and are used as a balance medium of nanometer sheets, the prepared two-dimensional titanate nanometer material is not easy to curl and has relatively-stable two-dimensional structure and relatively-large surface area, thereby further improving photocatalytic efficiency.

The invention relates to a patch for treating rotator cuff injuries, in particularly to a patch applicable to repairing huge rotator cuff tear. The patch is woven through the warping technology, is low in mass and not likely to be disengaged and has the good clipping performance; due to the special hole and boundary design, corresponding clipping and sewing fixation are easily perfrmed according to surgical needs. The rotator cuff patch is good in biomechanical intensity, can provide enough mechanical support for rotator cuff joints, avoids patch creep deformation and improves the surgical efficiency and the treatment effect.

The invention discloses a flexible texture coating which comprises the following components according to percentage by mass: 5-10% of water, 0.1-0.3% of anti-mildew anti-algae agent, 0.05-0.15% of preservative, 0.1-0.3% of dispersing agent, 0.05-0.15 of wetting agent, 0.02-0.07% of defoaming agent A, 7.5-11.5% of 600-mesh heavy calcium carbonate power, 10-15% of titanium dioxide, 1.5-3.0% of ultra-fine aluminium silicate, 10-15% of emulsion A, 15-20% of emulsion B, 10-12% of X1-X2-mesh heavy calcium stone tablet, 10-12% of X3-X4-mesh heavy calcium stone tablet, 13-15% of X5-X6-mesh heavy calcium stone tablet, 0.05-0.1% of defoaming agent B, 0.5-0.15% of solvent HA, 1-3% of solvent HB, 0.2-0.3% of cellulose A, 0.1-0.2% of cellulose B, 0.5-0.7% of thickening agent and 0.05-0.15% of PH value adjusting reagent. The flexible texture coating of the invention has the advantages of bridging slight crack, rich forms and colors and environmental protection; the preparation method of the invention has simple, easy and fast process.

The invention provides a two-color free-cut warp knitting fabric, a production method and an application thereof. The fabric is woven by a first guide bar and a second guide bar of a single needle bedhigh speed tricot warp knitting machine. The drawing-in mode of the first guide bar is (1A, 1B) or (2A, 2B) and drawing-in is performed in turns, wherein the A expresses trilobal nylon, the B expresses circular CDP, and the drawing-in mode of the second guide bar is the full threading of a spandex filament. In the invention, through carefully selecting a raw material, the special drawing-in modeis adopted, a weaving technology or a special dyeing technology are optimized, each step and each condition are cooperated to improve an effect so that the woven fabric has different color effects atdifferent angles, elastic force performance and serviceability are excellent, and a wide application prospect and a great market value are possessed.

The invention discloses an acrylamide copolymer and a preparation method and an application thereof, wherein the acrylamide copolymer contains an acrylamide structural unit and a structural unit A shown in a formula (I), the viscosity average molecular weight of the acrylamide copolymer is more than 30 millions, M1 and M2 can be same or different and respectively can be sodium or potassium. The invention also discloses a preparation method of the acrylamide copolymer, and an application of the acrylamide copolymer as an oil displacement agent, the acrylamide copolymer of the present invention has the advantage of high temperature resistance, and has good tackifying effect under high ore degree, the acrylamide copolymer can be widely used in petrochemical industry filed, and especially is taken as an oil-displacement agent for tertiary recovery.

The invention discloses a plant functional vehicle carpet and a preparation method thereof. The plant functional vehicle carpet contains plant functional polyester fibers, wherein the plant functionalpolyester fiber contains 0.1 to 1.5 percent of plant extract; wherein the plant extract is one or a combination of more of mint, valerian, lavender, wormwood and seaweed; the plant functional vehiclecarpet surface layer and the lining layer are both made of plant functional polyester fibers. The plant functional polyester filament yarn has high mechanical strength of the polyester fiber and miteand bacterium inhibiting performance of the plant extract, is good in bacterium inhibiting, deodorizing and abrasion resisting performance, has high elasticity, is not prone to pilling and contamination, does not carry static electricity or be stained with dust, and solves the problem that an existing carpet is not easy to clean. The carpet surface layer is soft and comfortable, the substrate layer is good in wear resistance, skid resistance and supporting effect, edge curling is not likely to happen, and practicability is higher.

The invention provides a lyocell knitted-fabric-like fabric and a processing method thereof. The fabric is formed by interweaving warp and weft. Tencel yarn is used as warp, full-cotton yarn is used as weft, vertical pointed twill weave is adopted for fabric weave, and the fabric has elasticity in the gradient direction of vertical pointed twill. The processing method includes the steps of conducting warping, sizing, weaving, gray fabric singeing, cold batch, whitening and tentering, sanding, printing, ageing and washing, loose type washing, flexible shaping and pre-shrinkage on warp and weft. According to the lyocell knitted-fabric-like fabric, tencel is used as warp, cotton is used as weft, the vertical pointed twill weave is adopted, the sanding process and the loose type washing process are conducted, the fabric has elasticity in the gradient direction of vertical pointed twill, and the fabric with the hand feeling and appearance similar to those of nitted fabrics is obtained, and the lyocell knitted-fabric-like fabric is stable in size, not prone to edge curling and suitable for being used as bedding articles.

The invention discloses a method for transferring a single graphene layer based on a degradable polymer. The method comprises the following steps of using the degradable polymer as an auxiliary material for graphene transfer; transferring the graphene from a lining substrate to a target substrate. The degradable polymer can be easily removed, can be dissolved into a solvent, and can also be degraded in hot water. The single graphene layer with fewer surface residues, good single-layer structure and high biological compatibility can be obtained by the method, and be attached to the substrate. The transfer method has the advantages that the transfer method is simple, the operation is easy, and the transferred graphene / substrate material can be widely applied into the fields of biological sensors, tissue engineering and the like.

The invention discloses an in-bath lubricant. The lubricant comprises the following components in parts by weight: 5-8 parts of hydroxypropyl distarch phosphate, 3-6 parts of sodium dodecyl benzene sulfonate, 10-20 parts of polyglycol ether, 4-8 parts of polyacrylamide, 6-10 parts of acroleic acid, 5-8 parts of tributyl phosphate, 3-6 parts of acrylate and 300-500 parts of water. Compared with the prior art, the in-bath lubricant provided by the invention has the beneficial effects that the lubricant enables textile fabrics to be good in softness and high in wet elasticity in water, so that the textile fabrics are not easy to curl or tangle; the lubricant has good lubricity and can reduce kinetic and static friction between fibers and between the fibers and equipment so as to avoid scratching the fibers; the lubricant is good in chemical stability under a high-temperature condition, and is good in compatibility with other auxiliary agents in treatment fluid; and the lubricant does not affect the absorption of dyes, keeps the color hues and tones of the dyes stable, and does not affect the dye uptake of the dye.

The invention discloses a dyeing-finishing pretreatment technology capable of recycling waste water. The technology comprises the following steps that firstly, fabric is conveyed into a full-width boiling machine and boiled; after the fabric is boiled, the fabric enters a padding and impregnating machine and is subjected to padding and impregnating treatment; after the fabric is subjected to the padding and impregnating treatment, the fabric is conveyed into a steaming box and steamed; after the fabric is steamed, the fabric is subjected to high-pressure washing in three or more washing machines in sequence, and then cloth is discharged. A water inlet of a water tank of the last washing machine is communicated with a clear water pipe, an overflow port of a water tank of the first washing machine is communicated with a water storage barrel, water in the water tank of the last washing machine can forward overflow to all the washing machines in sequence and is used for washing, waste water in the water storage barrel can be pumped into a waste water storage tank and stored, waste water in the waste water storage tank can flow into a first chemical material cylinder and a second chemical material cylinder through fall difference separately and is used for recycling chemical materials. According to the pretreatment technology, pretreated waste water can be recycled, during dyeing, the edges of pretreated fabric cannot be easily rolled, the fabric is good in permeability, and the dyeing defect cannot be easily generated.

The invention relates to an anti-scour offshore wind power fan. An anti-scour region which is formed by a plurality of splicing layers conducts anti-scour protection on a fan foundation. Supporting frameworks can support geotextile cushion layers, the flatness of the geotextile cushion layers is improved, the corners cannot be prone to curling, and therefore the stability of the structures of thegeotextile cushion layers is improved. The multiple splicing layers are connected with each other in an overlap joint mode and cannot be limited with each other, and therefore different splicing layers can heave along with the terrain of the seabed and preferably cover the seabed. In addition, the anti-scour region can adapt to the terrain of the seabed by itself. The corresponding splicing layerscan also correspondingly adjust the angles and the heights along with the scour deformation of the seabed, and therefore the overlarge gaps are prevented from being formed between the splicing layersand the seabed. As a result, the anti-scour region which is formed by the multiple splicing layers can achieve dynamic adjustment and preferably cover the seabed on the periphery of the fan foundation all the time. It can be seen that the anti-scour offshore wind power fan is good in anti-scour effect.

The invention relates to a preparation method of high-elasticity and easy-to-stick polyurethane-urea fibers. The method comprises steps as follows: 1), a polyurethane-urea dope A is prepared from polypolyols, diisocyanate and an amine chain extender in an organic solvent; 2), a polymer dope B is prepared from low-temperature softened polyurethane, a tackifier and the organic solvent through mixing; 3), the dope B is added to the dope A, the two dopes are mixed sufficiently and cured, a spinning dope is obtained, and the polyurethane-urea fibers are obtained with a dry spinning technology. Theprepared polyurethane fibers have good elastic recovery rate and excellent heat bonding performance. Therefore, fabric woven by the fibers not only has outstanding elasticity and touches compact, butalso has the characteristics of being runproof, anti-laddering, not prone to curling selvedge and the like.

The invention discloses equipment for laying a cable on the sea, and the equipment comprises a supporting rod, a shovel shaft, a wheel frame, an earth cutting wheel, a second bucket, a caterpillar band chassis, a case, a reel, a first air cylinder, an engine base, a first support plate, a shearing fork arm, a second pin shaft, a second hollow-out part, a second support plate, a first electromagnet, a second electromagnet, a motor case, a motor, an annular plate, a telescoping drilling rod, a cable, a bearing, a lifting lug, a folding tube, a first pin shaft, a first hollow-out part, a second air cylinder, a telescoping shaft, a groove, a rotating shaft, and a first bucket. The caterpillar band chassis is disposed below the case, and the front side of the caterpillar band chassis is provided with the wheel frame. The supporting rod is disposed between the wheel frame and the motor case. The equipment is advantageous in that the equipment can enable the head of the cable to be fixed.

Provided are a mold release film, a method for manufacturing the same, and a method for manufacturing a semiconductor package using the mold release film. The mold release film is not easily charged and curled, does not contaminate a mold, and has excellent mold followability. In a method for manufacturing a semiconductor package in which a semiconductor element is arranged in a mold and the mold is sealed with a curable resin, thereby forming a resin-sealed portion, the mold release film is arranged on a surface with which the curable resin on the mold is in contact. The mold release film is provided with a first thermoplastic resin layer being in contact with the curable resin during the formation of the resin-sealed portion, a second thermoplastic resin layer being in contact with the mold during the formation of the resin-sealed portion, and an intermediate layer being arranged between the first thermoplastic resin layer and the second thermoplastic resin layer. The storage elastic moduli of the first thermoplastic resin layer and the second thermoplastic resin layer at 180 DEG C are respectively 10-300 MPa, the difference in the storage elastic modulus at 25 DEG C is 1,200 MPa or less, the thickness is 12-50 [mu]m, and the intermediate layer includes a polymeric antistatic agent.

The invention discloses a method for preparing a 4-vinyl benzyl surface-active macromonomer, which is characterized by comprising the following steps: adding 20 portions of alkylphenol polyoxyethylene ether (CmH2m+1-C6H4-O-(CH2CH2O)nH, n is equal to 1 to 60, and m is equal to 1 to 20), 10 to 900 portions of solvent and 0.1 to 15 portions of catalyst into a three-mouth reaction flask with a reflux condensation device, and reacting for 1 hour under stirring at the room temperature; increasing temperature to 30 to 90 DEG C, adding 0.5 to 25 portions of 4-vinyl benzyl chloride into the reaction product, and continuously reacting for 6 to 48 hours; distilling the reaction product under reduced pressure to remove the solvent so as to obtain a crude product; and performing silica gel column chromatographic separation to obtain 4-vinyl benzyl alkylphenol polyoxyethylene ether with the yield of 62 to 94 percent. The 4-vinyl benzyl alkylphenol polyoxyethylene ether has excellent surface activity, and can be directly used as a surfactant. A water-soluble copolymer synthesized by taking the 4-vinyl benzyl alkylphenol polyoxyethylene ether as a surface-active macromonomer has the function of tackifying, or reducing solution surface tension and water-oil interfacial tension, and can be taken as a tackifying copolymer or a macromolecular surfactant for improving the oil recovery ratio.

The invention provides an automatic film spreading and laminating device which is used for solving the problem that film rollers are easy to be elongated to deform and serious in hemming due to being spread by means of tensile force. The device comprises a rack, a walking wheel, an earth covering disc, a film roller and a film pressing roller. The device is characterized in that a film roller frame is hinged on the rack or a film pressing roller frame; the film pressing roller frame is fixed on the rack; the film roller contacts with the film pressing roller; and a free end of a mulching film is located at the tangency part of the film roller and the film pressing roller. When the rack advances, friction force exists between the film pressing roller and the film roller; and under the function of the friction force, the film roller is driven to rotate in a contrary direction to spread the mulching film, so that the problem that the mulching films are easy to be elongated to deform and serious in hemming after the spreading in the prior art is solved and the utilization rate of the mulching film is improved.

The invention provides a method for manufacturing a soft algae specimen. The method comprises the following steps: step one, transferring algae of a specimen to be prepared to an expansion plate in water to enable the algae to be expanded on the expansion plate; step two, putting the expansion plate into a container, flatly laying a dried material / powder on the algae, and then carrying out dryingtreatment; step three, uniformly mixing a mixed glue solution prepared from epoxy resin and polyether amine D-230, performing defoaming at a temperature of not more than 40 DEG C, pouring the defoamedmixed glue solution into a mold, carrying out standing for 7-12 hours, taking down the algae dried in the step two from the expansion plate, adhering the algae onto the glue, covering the algae withthe defoamed mixed glue, and carrying out standing for 24-48 hours until the specimen is solidified; and step four, polishing the solidified algae specimen, coating UV glue, and carrying out UV lamp irradiation curing to complete the preparation. The specimen obtained by the method provided by the invention can better preserve the original form of algae.

The invention relates to a preparation method and application of graphene conductive paste. The graphene conductive paste is a compound of graphene and NMP (N-methylpyrrolidone). The method comprisesthe steps of: adopting a jet mill for crushing and screening raw material crystalline flake graphite; adding an oxidizing agent and an intercalating agent into the crushed raw materials according to acertain ratio for uniform mixing, and fully reacting in a water bath; repeatedly washing the reaction solution with deionized water, and performing centrifuging and drying; performing high-temperature puffing treatment on the dried powder to obtain a precursor; and finally, adding NMP into the precursor, and carrying out ultrasonic treatment for a certain time to obtain the graphene conductive paste. The graphene in the slurry has the characteristics of a small sheet diameter (less than or equal to 20 microns, controllable sheet diameter), the low defect and porosity. The key technical problem that graphene is used as a lithium battery positive electrode conductive agent in engineering application at present is solved. The preparation method is simple, low in cost and suitable for engineering production. The prepared graphene slurry and the carbon nanotube slurry are compounded as a conductive additive to be applied to the cathode of the lithium battery, so that the energy density andthe rate capability of the lithium battery can be remarkably improved.