30results about How to "Adjustable viscosity" patented technology

The invention relates to the technical field of self-tapping screw detection, in particular to self-tapping screw occlusal force detection equipment, which comprises a box body; and the first detection assembly comprises a lifting plate driven to ascend and descend, a mounting block is embedded in the upper end face of the lifting plate, two clamping blocks are symmetrically arranged above the first downward pressing rod, and the clamping blocks are driven to clamp screws. After a screw is installed by adjusting torsion through a slide rheostat, current conveyed to a circuit where an electromagnet is located can be adjusted as well, the electromagnet adjusts the magnetic force to attract the sliding amplitude of a sliding stop block in a liquid inlet box, the flow of hydraulic oil is adjusted, the hydraulic pressure of the hydraulic oil is increased, and the precision is matched with the torsion of the screw; and when the lifting plate is driven to descend, a force matched with a screw torsion force is applied, so that a final test result is prevented from being influenced by an overlarge or undersmall descending force of the lifting plate when the screw occlusal force is tested.

The invention belongs to the field of medical modification and natural polymer hydrogel, and provides viscosity-adjustable viscoelastic hydrogel and application of the viscosity-adjustable viscoelastic hydrogel in evaluation of influence of hydrogel viscosity on cell behaviors. Through a double crosslinking mechanism of covalent crosslinking and ionic crosslinking, two viscoelastic hydrogels with the same initial modulus and different viscosities are prepared. The covalent cross-linked hydrogel is composed of methylacryloylated alginic acid (AlgMA), gelatin (Gel) and phenyl (2, 4, 6-trimethylbenzoyl) lithium phosphate (LAP), and the ionic cross-linked hydrogel is composed of sodium alginate (Alg), gelatin (Gel) and calcium chloride. By accurately controlling the crosslinking degree, fine adjustment of the viscosity of the hydrogel is realized without changing the initial modulus of the hydrogel, which has important influence on adhesion and survival of neural stem cells. The experimental method provided by the invention verifies the key effect of the viscosity of the viscoelastic matrix in cell behavior regulation.

The application belongs to the technical field of waterborne polyurethane preparation, and particularly relates to a solvent-free photocuring polyurethane and a preparation method thereof, which comprises the following steps: 1) mixing 1,6-hexane diisocyanate trimer, hydroxypropyl acrylate and a polymerization inhibitor at 55-65 DEG C, and obtaining a PUA prepolymer after reaction; 2) mixing the PUA prepolymer, epoxy acrylate resin, hydrogenated rosin glyceride, an active diluent mixture containing a photoinitiator, PETMP, a tertiary amine type co-initiator, a silane coupling agent and a polymerization inhibitor, stirring, defoaming, filtering, and obtaining the solvent-free photocuring polyurethane; the application has the advantages of fast curing speed and high storage stability.

The invention discloses a method for tackifying the viscosity of a polymer displacement fluid, and the method comprises the following steps: S1, stirring a mixture containing thiourea, polyethylene glycol and water I to obtain a tackifying solution; and S2, adding the tackifying solution into the polymer displacement fluid, and stirring II to obtain the tackified polymer displacement fluid. The tackifying method provided by the invention is convenient and simple, adopts traditional dissolution compounding, is low in raw material price and easy to operate, is stable in tackifier product, and can be used for preparing the polymer tackifying liquid with specified viscosity by adjusting the addition amount according to actual requirements.

The invention belongs to the technical field of disinfectants, and provides a bacteriostatic agent based on chlorinated ether ketone and parachlorometaxylenol, and the bacteriostatic agent is prepared from the following components in parts by mass: 20-40 parts of chlorinated ether ketone, 10-30 parts of parachlorometaxylenol, 3-5 parts of a stabilizer, 3-5 parts of a thickening agent and 4-8 parts of an auxiliary agent. The sterilization characteristics of chlorinated ether ketone and parachlorometaxylenol are creatively combined, the efficient sterilization effect can be achieved, growth and reproduction of various microorganisms can be effectively inhibited, it can be ensured that the bacteriostatic agent is not prone to being influenced by environmental factors and losing activity through the addition of the stabilizer, and the bacteriostatic agent is not prone to being damaged by the environmental factors through the addition of the thickening agent and the auxiliary agent. The viscosity of the bacteriostatic agent can be adjusted, the smell of the bacteriostatic agent can also be adjusted, the acceptability of a user is improved, and the bacteriostatic agent can be widely applied to disinfection and bacteriostasis of clothes and household surfaces.

The invention relates to the technical field of coatings, and discloses PVDF varnish and a manufacturing process thereof.The PVDF varnish is prepared from, by weight, 40-60 parts of PVDF powder, 40-60 parts of acrylic resin, 60-80 parts of isophorone, 0.5-1.5 parts of amino resin, 3-7 parts of a flatting agent, 2-4 parts of a defoaming agent, 1-3 parts of a thickening agent and 1-3 parts of an ultraviolet light absorber, the flatting agent is an organic silicon flatting agent, the defoaming agent is a mineral oil defoaming agent, and the thickening agent is an organic silicon flatting agent. The thickening agent is a cellulose thickening agent, the ultraviolet light absorber is a benzotriazole ultraviolet light absorber, and the preparation method comprises the following steps: S1, preparation before preparation, S2, raw material addition and dispersion, S3, comprehensive dispersion, S4, filtration and detection, and S5, cleaning and after-treatment work. The PVDF powder, the acrylic resin, the isophorone and the amino resin are combined, and the leveling agent, the defoaming agent, the thickening agent and the ultraviolet light absorber are added, so that the leveling property of the varnish is improved, bubbles are reduced, the appearance quality of the varnish is improved, and the service life of the varnish is prolonged.

The invention relates to the technical field of pressure-sensitive adhesives, in particular to a single-component acrylate pressure-sensitive adhesive and a preparation method thereof.The single-component acrylate pressure-sensitive adhesive is prepared from, by mass, 138-161 parts of monomers, 190-210 parts of a first solvent, 10-50 parts of a second solvent, 0.1-0.5 part of an initiator and 6-9 parts of a curing agent; the monomer comprises at least one of a soft monomer, a hard monomer and a functional monomer. The specific soft monomer and the curing agent are introduced, and the mass ratio of the soft monomer to the hard monomer to the functional monomer in the monomers is controlled to be (100-110): (30-40): (8-11), so that the oil resistance of the pressure-sensitive adhesive is greatly improved while the high-temperature resistance of the acrylate pressure-sensitive adhesive is improved, and meanwhile, the pressure-sensitive adhesive has good storage stability at room temperature, and is suitable for industrial production. And the application requirements of special occasions such as high temperature and high oil can be met, and important practical value and wide market prospect are achieved.

The invention discloses a wall crack repair material, which is a water-based penetrating inorganic waterproofing agent, comprising, by mass percentage, 30-50wt% of an alkali metal silicate aqueous solution and 0.2-5wt% of a penetrating crystallization functional auxiliary agent, and the rest being water; wherein the alkali metal silicate aqueous solution is selected from at least two of a sodium silicate aqueous solution with a mass fraction of 30-40%, a potassium silicate aqueous solution with a mass fraction of 30-40%, or a lithium silicate aqueous solution with a mass fraction of 20-30%, and the like; and the penetrating crystallization functional auxiliary agent comprises, by mass percentage, 55-65% of EDTA-4Na, 15-25% of triethanolamine, 5-15% of citric acid, 6-10% of sodium polyacrylate, and 1-3% of sodium dodecylbenzene sulfonate. When repairing wall cracks, first clean the wall at the cracks, remove dust, dirt and loose parts on the surface, repair and smooth the roughness, pits and other defects with cement-based materials, and then use U-shaped sealing strips, water-absorbent resin curing films or a combination of the two to repair the cracks or fissures on the wall.

This invention provides a method for preparing an emulsion-gel fracturing fluid and a solid proppant, as well as their applications. The method for preparing the emulsion-gel fracturing fluid includes: uniformly mixing epoxy resin, diluent, emulsifier, pH adjuster, and defoamer to obtain a mixture; adding water to the mixture while stirring to obtain an oil-in-water emulsion; adding a curing agent to the emulsion; heating and stirring; allowing sedimentation; ensuring the epoxy resin and curing agent are fully mixed and initially cured; then adding gel for crosslinking to obtain the emulsion-gel fracturing fluid; or adding a curing agent to the emulsion; stirring thoroughly; adding gels of different concentrations; stirring; and crosslinking to obtain the emulsion-gel fracturing fluid. The emulsion-gel fracturing fluid is heated to a curing temperature to generate a proppant. The emulsion-gel fracturing fluid of this invention has adjustable viscosity, low filtration loss, and can generate a solid proppant in situ under formation conditions, making it suitable for oil and gas field development. The generated proppant has high mechanical strength, good conductivity, and adjustable particle size.

The application relates to the adhesive technical field and discloses a sisal polishing wheel setting adhesive and a preparation method thereof, wherein the sisal polishing wheel setting adhesive is prepared by compounding a specific formula of vinyl-acrylic emulsion, silica sol, ethylene-vinyl acetate copolymer emulsion and a thickening agent; the vinyl-acrylic emulsion is prepared by deionized water, vinyl acetate, butyl acrylate, methyl methacrylate, acrylic acid, a functional monomer, a composite emulsifier and an oxidation-reduction initiation system through a specific pre-emulsification-step-by-step dropping process. The functional monomer is introduced to participate in copolymerization, a chemical bridge between a polymer and sisal fibers is constructed, the composite silica sol forms a Si-O-Si inorganic network and produces strong hydrogen bond action with the organic polymer chain, the VAE emulsion is added to improve the flexibility of the adhesive film and the wettability of the plant fibers, the three are synergistic, a stable interpenetrating network structure is formed, and the technical problems that the traditional setting adhesive is poor in temperature resistance, insufficient in wear resistance, difficult to consider environmental protection and performance at the same time are solved.

The invention provides soybean ink which is bright in color and flat in printing. The printing ink is prepared from the following raw materials in parts by weight: 30-35 parts of pigment, 30-35 parts of epoxidized soybean oil, 15-20 parts of polyester modified acrylic resin, 10-15 parts of linear phenolic resin, 4-6 parts of acrylic acid modified alkyd resin, 15-20 parts of filler, 10-15 parts of solvent, 2-4 parts of polyethylene wax, 1-2 parts of surfactant, 0.5-1 part of ionic liquid, 0.5-1 part of slow drying agent, 0.5-1 part of drying agent and 0.5-1 part of gel. The filler is a blend of nano calcium carbonate and organic montmorillonite in a weight ratio of 3: 1; the solvent is a blend of isoamyl acetate and butanol in a weight ratio of 2: 1. The soybean ink disclosed by the invention is good in flowing property, moderate in drying speed and relatively good in adhesive force with printed paper in a printing process, and the color is bright and flat after printing. The invention also provides a preparation method of the soybean ink.

The utility model discloses a viscosity-adjustable cream stirring device which comprises a cream stirring barrel movably installed on the inner side of a supporting frame, a stirring motor is arranged at the top of the cream stirring barrel, an output shaft of the stirring motor is fixedly connected with a stirring shaft, and the bottom end of the stirring shaft rotationally penetrates into the cream stirring barrel and is fixedly connected with a scattering head. Stirring paddles are fixedly connected to two sides of the stirring shaft; an adjusting bin is fixedly mounted on the left side of the top of the cream stirring barrel, and corn starch is stored in the adjusting bin. According to the utility model, not only is the viscosity of cream convenient to adjust, but also the cream material can be fully and uniformly stirred and processed by utilizing the matching of up-down vibration and rotary stirring of the cream material, particularly, the dispersion effect on the powder material is better, the phenomena of starch caking and insufficient colloid dissolution in the prior art are avoided, and the production efficiency is improved. Therefore, the cream viscosity distribution is more uniform, and the overall stirring and using effects are better.

This application provides a tubing thread sealant for shallow coalbed methane wells, its preparation method, and its application, belonging to the field of oilfield development. The tubing thread sealant comprises: component A, component B, and component C; wherein, by weight, component A includes the following chemical components: 41-61 parts of polymer matrix, 15-23 parts of 5-methylthio-7-fluoro-1H-indene, and 23-37 parts of excipients; component B includes the following chemical components by weight: 80-90 parts of epoxy curing agent and 10-25 parts of epoxy curing accelerator; and component C is an additive. In component A, a polymer matrix is ​​used as the matrix. By introducing molecularly designed active substances containing fluorine and sulfur elements, such as 5-methylthio-7-fluoro-1H-indene, the material combines the weather resistance and toughness of rubber while maintaining stable performance at high temperatures, making it less prone to deformation or failure.

The invention relates to water-based latex as well as a preparation method and a construction method thereof, and belongs to the technical field of sealing materials. The main film-forming substance in the water-based latex is the styrene-butadiene latex, a layer of compact styrene-butadiene rubber film can be formed after curing, and the film-forming effect is achieved. Hydroxyethyl cellulose plays a crucial role in latex, and the hydroxyethyl cellulose can act with latex particles due to good emulsification and suspension properties, so that the particles can be uniformly dispersed in the latex. In addition, the hydroxyethyl cellulose can also reduce the occurrence of a sedimentation phenomenon and promote the emulsion to maintain the form and the stability of the emulsion. The water-based latex product which is stable in form, low in gas content and not prone to deterioration can be formed by adding the defoaming agent and the degerming agent through the synergistic effect of the raw materials. After being used, the sealant can form a compact rubber film layer, has excellent sealing performance, can effectively block the permeation of gas and moisture, has a good film-forming effect, has good leveling property during spraying construction, and is not easy to have a sagging phenomenon.

The application discloses a synthesis method of polyether polyol and belongs to the technical field of chemical synthesis of fine chemicals. The method comprises the following steps: mixing 4-n-hexyl resorcinol and a small-molecule alcohol compound, adding an inorganic alkali catalyst to perform reaction, and then performing vacuum distillation treatment; a mixture of propylene oxide and ethylene oxide is added to the system to perform reaction; after the reaction is completed, propylene oxide is introduced to perform reaction, and then ethylene oxide is introduced to perform reaction; after the reaction is completed, an acid is added to adjust the pH value, and then filtration and vacuum distillation treatment are performed to obtain the polyether polyol. The synthesis of the 4-n-hexyl resorcinol-based special polyether polyol is realized under mild conditions, the viscosity, the hydroxyl value, the average molecular weight and the HLB value can be controlled, the polyether polyol can replace the use of environmental hormone chemical substances such as nonyl phenol and octyl phenol polyoxyethylene ether, and the polyether polyol has remarkable environmental protection and application values.

The invention relates to the field of furniture paint curing agents, and discloses a preparation process of a quick-drying polyurethane furniture paint curing agent which comprises the following components in parts by weight: 30-50 parts of polyether polyol, 15-30 parts of acrylate monomer, 15-25 parts of isocyanate, 1-5 parts of a photoinitiator, 0.5-3 parts of a catalyst, 1-5 parts of a flatting agent, 1-5 parts of a toughening agent, 0.5-2 parts of an anti-ultraviolet agent, 0.1-1 part of a preservative, 5-8 parts of a solvent and 0.1-2 parts of a thickening agent. A firm three-dimensional cross-linked network can be formed through reaction of polyether polyol and isocyanate, cross-linking is formed in the photopolymerization process of acrylate, when the curing agent is mixed with the polyurethane furniture paint, a more complex cross-linked network can be formed in a coating, the drying speed of the polyurethane furniture paint is further increased, and the curing agent has the advantages of being high in curing speed and good in curing effect. And the paint film can reach the required hardness and stability in a short time.

The application provides an edible enzyme cross-linking color drawing coating, a preparation method and application, and belongs to the technical field of food packaging materials, and comprises the following components in percentage by weight: 4-10% of edible connecting material, 0.1-3% of biological cross-linking enzyme, 1-6% of microcapsule natural pigment, 1-5% of enzyme activity aid, 0.1-1% of rheological modifier, 1-5% of plasticizer, and the rest is solvent; the biological cross-linking enzyme comprises one or more combinations of glutamine transaminase, laccase, tyrosinase, polyphenol oxidase, peroxidase and lysine oxidase. The biological cross-linking enzyme is used to catalyze the connecting material and the casing substrate to form a covalent bond, so that the defects of weak adhesion and easy peeling of the traditional physical adsorption type coating are fundamentally overcome, the coating is non-toxic and non-residual, conforms to the clean label trend, realizes the perfect combination of food safety and excellent processing performance, and has high industrialization value.

The present application relates to a kind of preparation method of metallocene polyethylene of wide molecular weight distribution, belong to olefin polymerization catalysis technical field.The preparation method of metallocene polyethylene of wide molecular weight distribution provided by the present application includes the following steps: (1) mixed metallocene catalyst, organic aluminum compound and mixed solvent, heating, and into ethylene is carried out polymerization reaction;The mixed solvent includes organic solvent A and organic solvent B, the organic solvent A is inert alkane or aromatic hydrocarbon, and the organic solvent B is the organic solvent containing polar functional group;(2) after reaction, quenching agent is added to terminate the reaction, washing, filtration, drying, it is finished.The present application uses mixed solvent system, and the use amount and the ratio of two components of mixed solvent are adjusted to realize the adjustment of metallocene polyethylene molecular weight distribution, greatly reduce the requirement of complex bifunctional catalyst, catalyst cost is low, polymerization process is simple, product performance is flexible, and application prospect is wide.

The utility model discloses a system for reducing tar content of a condensate tank, which comprises a primary cooler and the condensate tank, a partition plate and an inclined baffle plate are arranged in the condensate tank, the inside of the condensate tank is divided into a settling area and a water passing area by the partition plate, the inclined baffle plate is arranged above the water passing area, and the other end of the inclined baffle plate obliquely downwards exceeds the top of the partition plate. A mixed liquid inlet and a liquid supplementing opening are formed in the top of the condensate tank, the mixed liquid inlet is formed above the settling area, and the liquid supplementing opening is formed above the inclined baffle; a probe of the liquid viscosity sensor is arranged in the water passing area; an external ammonia water pipe is connected to the liquid supplementing opening, an electric control valve is arranged on the external ammonia water pipe, the signal output end of the liquid viscosity sensor is connected with the signal input end of the DCS controller, and the DCS controller is electrically connected with the electric control valve. The device has the advantages that by arranging the liquid viscosity sensor in the condensate tank, the viscosity of the mixed liquid is monitored, ammonia water can be timely controlled to enter, the mixed liquid is diluted, the tar content ratio is reduced, and the viscosity is adjusted.

The utility model discloses an artificial lower limb capable of intelligently adjusting damping based on an IMU (Inertial Measurement Unit) and magnetorheological fluid. Comprising a stump mounting sleeve, an artificial thigh part, a knee rotary magnetorheological fluid damper, an artificial shank part, a leg telescopic magnetorheological fluid damper, an ankle rotary magnetorheological fluid damper, an artificial foot part, a foot telescopic magnetorheological fluid damper, an inertia measurement sensor, a first pressure sensor, a second pressure sensor and a damping controller, the stump mounting sleeve is arranged at the upper end of the thigh artificial limb part and used for being connected with a thigh amputation part, and the bottom end of the thigh artificial limb part is rotationally connected with the shank artificial limb part through the knee rotary magnetorheological fluid damper; the bottom end of the lower leg artificial limb part is connected with the artificial foot part through the ankle rotary magnetorheological fluid damper, a gravity center cavity is formed in the gravity center position of the whole artificial lower limb, and the inertia measurement sensor is installed in the gravity center cavity.

The invention discloses antibacterial polyurethane surface layer resin for automobile leather and a preparation method of the antibacterial polyurethane surface layer resin, and relates to the technical field of high-molecular polymers. 1 to 20 parts of polyisocyanate; 4.5 to 12.5 parts of a hydrophilic chain extender; 0.5 to 2 parts of a small molecular alcohol chain extender; 1-10 parts of an amine chain extender; 0.01 to 0.5 part of a catalyst; 2-5 parts of a salt forming agent; wherein the hydrophilic chain extender is caffeic acid; the caffeic acid is adopted to replace a carboxylic acid type hydrophilic chain extender, so that the wear resistance, weather resistance and mechanical strength of the prepared waterborne polyurethane are greatly improved.

The invention relates to the field of coatings, and discloses a novel waterproof and moistureproof coating and a preparation process thereof.The novel waterproof and moistureproof coating is prepared from 40%-50% of acrylic emulsion, 5%-10% of organosilicon waterproofing agent, 20%-30% of filler, 5%-10% of pigment and the balance auxiliaries, the filler comprises calcium carbonate and talcum powder, and the auxiliaries comprise a dispersing agent, a defoaming agent and a thickening agent; the calcium carbonate and the talcum powder not only increase the strength and stability of the coating, but also have hygroscopicity, can adjust the humidity around a base layer, and are matched with the thickening agent and other auxiliaries to further enhance the moisture-proof function. Through the synergistic effect of the acrylic emulsion and the organic silicon waterproof agent, a continuous and compact waterproof film can be formed on the surface of a base layer, moisture permeation is effectively prevented, and the problem that the polyurethane waterproof coating is prone to leakage after being eroded by moisture for a long time is solved; and the organic silicon waterproof agent can further enhance the waterproof performance, so that the coating can keep an excellent waterproof effect in various environments.

The invention belongs to the field of organic thin film packaging materials, and particularly discloses a photosensitive resin composition for packaging a photoelectron component and a use method of the photosensitive resin composition, and the photosensitive resin composition comprises the following components in parts by mass: 20-50 parts of an ultraviolet curable monomer, 2-8 parts of a photo-crosslinking initiator and 5-30 parts of functional dispersion liquid. Wherein the ultraviolet light curable monomer is formed by mixing (methyl) acrylate containing a long carbon chain and a bridged ring light curable monomer according to a specific mass ratio; the functional dispersion liquid comprises a monofunctional group reaction monomer and hollow microspheres, and the surfaces of the hollow microspheres are connected with organic modification groups. The photosensitive resin composition is excellent in comprehensive performance, the viscosity and surface tension of the photosensitive resin composition meet the range of ink-jet printing requirements, the photosensitive resin composition has high curing rate, light transmittance and refractive index, especially the dielectric constant can be controlled to be 2 or below, and the photosensitive resin composition has excellent mechanical property and water and oxygen isolation capacity and provides material support for packaging of related electronic components.

The present invention provides a preparation method of colored slow-release scent beads, and its products and applications. The preparation method comprises the following steps: mixing an inorganic material, an ionic surfactant and water, stirring, filtering and drying to obtain a first material; mixing the first material, a thickener, a pigment, an auxiliary agent and water to obtain a suspension; dropping the suspension into a calcium salt solution, placing it, and obtaining a second material; washing and calcining the second material in sequence to obtain visualized particles; mixing the visualized particles with essence and / or spices to obtain the colored slow-release scent beads. The colored slow-release scent beads provided by the present invention have good appearance, high particle size and uniformity, low breakage rate, high product quality, high biological safety, and good fragrance effect.

The present invention relates to a wire-submerged arc sintering flux for high-temperature nickel-based alloys and a preparation method thereof. Specifically, the wire-submerged arc welding sintering flux for high-temperature nickel-based alloys is prepared by mixing the following fine powders: fluorite, sillimanite, white corundum, magnesia, mica, cryolite, and clay. The flux is prepared according to the following process: seven kinds of fine powders of fluorite, sillimanite, white corundum, magnesia, mica, cryolite, and clay are mixed and dry-mixed in a formula ratio, and then potassium sodium silicate is added and stirred and mixed to obtain a mixture; the mixture is first dried at a low temperature of 180 to 230°C, and then sintered at a high temperature of 700 to 900°C and sieved to obtain a granular wire-submerged arc welding sintering flux for high-temperature nickel-based alloys. The flux obtained by the present invention exhibits excellent effects as described in the specification.

The invention provides a nano magnetic particle and a preparation method and application thereof.The chemical formula of the nano magnetic particle is Sr1-x-yBaxLayFe12-zCozO19, 0 < = x < = 0.3, 0 < = y < = 0.3, 0 < = z < = 0.25, x, y and z are not 0 at the same time, and the average particle size of the nano magnetic particle is 20-40nm. The nano magnetic particle is small in particle size and shows excellent magnetic performance; and the magnetic storage device can further meet the storage requirement of huge data in the informatization era.

The invention discloses a magneto-rheological shock absorber and a vehicle, and relates to the technical field of vehicle shock absorbing.The magneto-rheological shock absorber is additionally provided with a first circulation cavity and a second circulation cavity, magnetic fields are applied to magneto-rheological fluid through a first electromagnetic induction assembly and a second electromagnetic induction assembly, the damping adjusting range of the magneto-rheological shock absorber is widened, and the damping effect of the magneto-rheological shock absorber is improved. The first electromagnetic induction assembly and the second electromagnetic induction assembly can independently or jointly adjust the viscosity of the magnetorheological fluid, adjustment of a larger damping range of the magnetorheological damper can be achieved, and then the requirements for comfort and controllability of a vehicle under a larger vibration scale can be met.

The invention provides sun-proof ink for paper product printing. The ink is prepared from the following raw materials in parts by weight: 30-35 parts of pigment, 28-33 parts of epoxidized soybean oil, 17-23 parts of rosin modified phenolic resin, 10-15 parts of terpene phenolic resin, 6-8 parts of acrylic acid modified alkyd resin, 2-3 parts of a UV absorbent, 0.2-0.5 part of an antioxidant, 18-20 parts of filler, 10-15 parts of a solvent, 1-2 parts of a surfactant, 0.5-1 part of a drying agent and 0.5-1 part of gel. The filler is a blend of nano aluminum oxide powder and organic nano montmorillonite powder in a weight ratio of 1: 1; the solvent is a blend of isoamyl acetate and pentaerythritol in a weight ratio of 1: 1; the UV absorbent is a blend of phenyl salicylate and 2-hydroxy-4-n-octyloxybenzophenone in a weight ratio of 1: 2; the antioxidant is bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite ester. The ink disclosed by the invention has a very good sun-proof effect and also has a good printing effect.

The present invention relates to the technical field of polymer materials, and specifically to a block copolymer modified para-aramid polymer solution and a preparation method and application thereof, wherein the preparation method comprises: dissolving a solubilizing salt into an organic solvent under an inert gas atmosphere to obtain the polymer solution; adding a third monomer and terephthaloyl chloride to the polymer solution, controlling the reaction temperature to perform a pre-condensation reaction, and obtaining an amino-terminated oligomer system; adding p-phenylenediamine and terephthaloyl chloride to the oligomer system, and controlling the stirring reaction temperature to perform a block copolymerization reaction under stirring conditions; after the block copolymerization reaction is completed, adding a neutralizer to neutralize the acidic substances generated during the reaction, and finally obtaining a modified para-aramid polymer solution in a neutral environment. The polymer solution is applied to the field of lithium battery separators to obtain a modified aramid coated separator with excellent heat shrinkage performance, high film breaking temperature, porous structure, and high puncture resistance.

In order to improve the AMOLED display quality, the application solves the residual image problem by using a polyimide material. The application discloses a polyimide precursor prepared from diamine monomers and dianhydride monomers. The application introduces 0.1-6 mol% fluorine-containing diamine monomers into the diamine monomers and 0-4 mol% fluorine-containing dianhydride monomers into the dianhydride monomers to reduce the dielectric constant of the polyimide precursor after curing. Meanwhile, the application discloses a preparation method of the polyimide precursor. The method controls the water content of the reaction system to perform high-temperature hydrolysis reaction, so as to control the proportion of the amine group as the end and the carboxyl group as the end, thereby achieving the effect of adjusting the viscosity of the polyimide precursor slurry. In the case of combining the fluorine-containing reaction raw materials and the high-temperature hydrolysis reaction, the viscosity of the polyimide precursor slurry is more controllable, the dielectric constant of the polyimide film is lower, and the expansion coefficient is smaller, thereby achieving a better effect of improving the residual image.