387 results about "Barium sulphate" patented technology

The invention discloses a water-borne epoxy resin coating which comprises a component A and a component B, the component A is prepared from 60 to 80 parts of 50 percent modified water-borne epoxy resin emulsion, 5 to 15 parts of deionized water, 0.5 to 1 part of wetting dispersant, 0.2 to 0.8 part of defoaming agent, 5 to 10 parts of modified zinc phosphate, 3 to 5 parts of ion exchange antirust pigment, 4 to 6 parts of sericite powder, 3 to 5 parts of glass flake, 5 to 10 parts of precipitated barium sulphate, 1 to 5 parts of nano silicon dioxide and 0.5 to 1 part of rheological additive; 1 to 2 parts of modified organic bentonite slurry; 0.1 to 0.3 part of a pH conditioning agent; and 0.2 to 0.8 part of a flash rust inhibitor. The component B is prepared from 40 to 50 parts of waterborne epoxy-amine adduct, 20 to 30 parts of 50 percent modified polyamide curing agent, 5 to 15 parts of 60 percent Mannich base phenolic aldehyde amine curing agent, 0.5 to 1.5 parts of epoxy silane coupling agent, 1 to 2 parts of nonionic surfactant and 15 to 20 parts of deionized water. The emulsion stability of the waterborne epoxy resin coating is improved through a bisphenol A / F mixed epoxy emulsion and a grafted polyethylene glycol hydrophilic chain segment.

The invention belongs to the technical field of drilling fluid, and particularly relates to a free radical polymerization water-based drilling fluid composition and a preparation method thereof. The invention relates to a core-shell composite particle-containing water reducer which comprises deionized water, salts (NaCl / KCl), alkalis (Na2CO3 and NaOH), barium sulfate and core-shell composite particles X. The particle is composed of a silicon dioxide core and a polymer shell layer, and the shell layer is formed by free radical copolymerization of acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and acrylic acid and is covalently connected with the core through silanization treatment. Under the conditions of high salinity, strong alkali and high solid phase weighting, the drilling fluid simultaneously realizes the following effects: (1) high-density bearing and low-viscosity pumpability are realized; (2) compact plugging and water loss reduction and low formation damage flowback can be realized; and (3) stable rheology rock carrying, lubrication and friction resistance reduction. The problem that three aspects of performance are difficult to consider in the prior art is solved, and the drilling fluid is suitable for drilling of deep wells, ultra-deep wells and complex stratums and has remarkable industrial application value.

The invention relates to the technical field of high polymer materials, in particular to a light-aging-resistant flame-retardant ABS material for an electric fitting box and a preparation method of the light-aging-resistant flame-retardant ABS material. Comprising the following raw materials: ABS resin, AS resin, ABS high rubber powder, CPE, bromotriazine, carrier-free antimony trioxide master batch, a flame retardant synergist, precipitated barium sulphate, titanium dioxide, a main antioxidant, an auxiliary antioxidant, a lubricant, an anti-dripping agent, a dispersing agent and an ultraviolet absorbent. The material has excellent flame retardant property, and the synergistic effect of the flame retardant components such as the bromotriazine and the like reaches a high flame retardant grade; the ultraviolet absorbent and the titanium dioxide can delay aging and stabilize the color; the melt flow rate is high, and the fluidity is improved through cooperation of high-melt-index ABS and low-molecular-weight AS resin; the mechanical property is good, and the raw materials cooperate to guarantee strength and toughness; the appearance quality is good, pocking marks are avoided, and the glossiness is good. The preparation process is simple, and conventional equipment and reasonable parameters ensure stability and operability.

The present invention addresses the problem of providing a curable resin composition having excellent abradability and excellent chemical resistance and permeation resistance during printing. [Solution] A curable resin composition comprising (A) an epoxy resin, (B) an epoxy resin curing agent, and (C) an inorganic filler, the (C) inorganic filler comprising at least three types of silica (C1), calcium carbonate (C2), and barium sulfate (C3).

The invention belongs to the technical field of wear-resistant coatings, and particularly relates to a wear-resistant coating for a metal plate of a compressed garbage truck and a preparation method of the wear-resistant coating. The invention aims to solve the problem that an existing coating for the metal plate of the garbage truck is difficult to keep good protection performance under corrosion and abrasion. The preparation method comprises the following steps: carrying out pre-reaction grafting modification on epoxy resin and amine-terminated polyether to obtain an epoxy prepolymer; alpha-aluminum oxide and barium sulfate are mixed, dispersed, ground and subjected to surface activation, and a basic filler is obtained; adding a mica filler into the basic filler, and shearing and mixing to obtain a composite filler; mixing the epoxy prepolymer with a phosphate auxiliary agent to obtain a primer; dispersing and mixing the epoxy prepolymer and the composite filler to obtain a functional coating; after a metal base material is subjected to sand blasting treatment, primer is pre-sprayed on the surface of the metal base material, and then functional paint is covered and sprayed to obtain the wear-resistant coating. The wear-resistant coating prepared by the invention can keep good protection performance under corrosion and wear, and has high application value.

The invention discloses anti-radiation hydrogel capable of being used for interventional radiosurgery and a preparation method and application thereof.The anti-radiation hydrogel is in bridge connection with polymer chains of sodium alginate and sodium hyaluronate through the physical interaction between Fe < 3 + > and carboxyl, and the reversible interaction between Fe < 3 + > and carboxyl endows the hydrogel with the shear thinning characteristic; the injectability is ensured; the bismuth oxide nano-particles and the barium sulfate nano-particles are doped to achieve efficient attenuation of X-rays in the range of 20-100 keV, and meanwhile, the complementary K-edge absorption characteristics of the bismuth oxide nano-particles and the barium sulfate nano-particles are utilized, and the radiation absorption effect of a hydrogel network structure is combined, so that broad-spectrum radiation protection is achieved; according to the invention, acrylamide is taken as a raw material, an interpenetrating network elastic hydrogel of three polymers is formed under the action of polymerization under thermal initiation of acrylamide, the conversion from an injectable state to a solid state is realized, and at the moment, the cured hydrogel has tough mechanical properties, can also form a protective layer similar to gloves, and can be used for radiation protection in interventional operations.

To provide a coating composition capable of forming a coating film excellent in blocking resistance and anticorrosion properties.SOLUTION: The coating composition contains: (A-1) at least one pigment having an aspect ratio of 1 or more and less than 5 and selected from barium sulfate, silica, and calcium carbonate; and (A-2) a scaly pigment having an average particle diameter of 2-30 μm and an aspect ratio of 5 or more and less than 30. The mass ratio of (A-1):(A-2) is within the range of 90:10-70:30.SELECTED DRAWING: None

The utility model discloses a liquid-phase synthesis system of lithium sulfide. Comprising a first lithium sulfate dissolving device, a first barium sulfide dissolving device, a chemical combination reaction device, a first separation device and a second separation device, the liquid phase after-treatment unit is used for concentrating, purifying and drying the liquid phase to obtain lithium sulfide, and the solid phase after-treatment unit is used for washing and drying the solid phase to obtain barium sulfate; the first lithium sulfate dissolving device and the first barium sulfide dissolving device are both connected with a raw material inlet of the combination reaction device; and a reaction product outlet of the combination reaction device is connected with the first separation device. The liquid-phase synthesis system of the lithium sulfide has the advantages that products are easy to separate, the purity of the lithium sulfide products is high, the liquid-phase synthesis system of the lithium sulfide is very suitable for industrial-scale production, and the produced high-purity anhydrous lithium sulfide is very suitable for solid-state battery anode materials and has huge potential economic benefits.

The application relates to the technical field of paint, and particularly discloses a water-based insulating paint and a preparation method; the water-based insulating paint comprises components A and B, the mass ratio of the components A and B is (7-9):1, the component A comprises the following raw materials in parts by weight: deionized water 100-150 parts, bentonite 3-8 parts, fumed silica 3-8 parts, titanium white 40-80 parts, barium sulfate 90-110 parts, mica powder 40-60 parts, zinc phosphate 60-80 parts, feldspar powder 40-60 parts, epoxy emulsion 400-500 parts, base material wetting agent 3-5 parts and dispersant 30-80 parts; the component B comprises the following raw materials in parts by weight: curing agent 40-60 parts and solvent 40-60 parts; the dispersant comprises a sulfonate dispersant and a polycarboxylate dispersant; the application promotes the insulating performance of the paint through the synergistic effect of various components, reduces the agglomeration of particles in the paint system, and improves the dispersing performance of the paint.

The invention relates to the technical field of sound insulation materials, in particular to a high-performance sound insulation material for buildings and a preparation method thereof, and the high-performance sound insulation material comprises the following raw materials in parts by weight: 60-80 parts of polypropylene, 15-25 parts of filler, 10-20 parts of talcum powder, 5-15 parts of flexibilizer, 0.2-1 part of antioxidant and 0.2-0.4 part of light stabilizer. According to the invention, the SEBS with high damping performance is utilized to provide a main viscoelastic effect, and the density performance of the material can be directly increased by combining the barium sulfate material with high density, so that the low and medium frequency sound insulation function is improved, and the hollow glass beads can utilize the spherical surfaces to cause scattering and refraction of sound waves and disturb the propagation direction of the sound waves in the hollow glass beads; meanwhile, in cooperation with the high radius-thickness ratio state of the mica sheet, sound waves are further dispersed and refracted in combination with the hollow glass beads, the conduction path of the sound waves is prolonged, and therefore the medium-high frequency sound insulation performance is improved, and the sound insulation performance of the material is effectively improved.

This application discloses a method for producing an anticorrosion coating having excellent adhesion to rusted, low-treatment surfaces, which relates to the field of paint chemical industry. The anticorrosion coating comprises Component A and Component B, where Component A comprises an epoxy resin, double-coated hollow glass microbeads, a thixotropic agent, a wetting and dispersing agent, a pigment, barium sulfate, talc, Solvent A, an antifoaming agent, a first silane coupling agent, and an aluminum powder paste, and Component B comprises a curing agent, an accelerator, and Solvent B.

The invention provides a long-acting anticorrosive epoxy powder coating and a preparation method thereof. The coating comprises epoxy resin, polyester resin, thiadiazole corrosion inhibitor loaded cerium-doped hydrotalcite composite particles, silane modified mica iron oxide, zinc phosphate, barium sulfate and the like. The core innovation lies in that 2-amino-5-(4-hydroxyphenyl)-1, 3, 4-thiadiazole corrosion inhibitor molecules are designed and synthesized, the molecules are loaded between cerium-doped magnesium-aluminum hydrotalcite nano container layers through an anion exchange method, corrosion environment pH responsive gradient release is achieved, a coating constructs a passive shielding, active corrosion inhibition and interface anchoring triple protection mechanism in the coating, and the corrosion resistance of the coating is improved. The neutral salt spray test resistance exceeds 2000h, and the coating is suitable for long-acting corrosion protection of iron accessories and cable bridges.

The invention provides a high-weather-resistance powder coating and a preparation method thereof, and belongs to the technical field of powder coatings. According to the invention, a hyperbranched polyester skeleton is constructed through esterification reaction of trimethylolpropane, adipic acid and maleic anhydride, hydroxyl-terminated polyether, pentaerythritol and 2, 4-dihydroxybenzophenone are introduced to adjust flexibility, thermal stability and ultraviolet aging resistance, and allyl glycidyl ether is utilized to improve chemical activity and network stability; phosphorus-containing heterocyclic ring-polynitrogen imide oligomer is generated through substitution reaction and subsequent modification of phosphonitrilic chloride trimer, aniline and ethanolamine, and the coating is endowed with flame retardance, heat resistance and adhesive force. In the preparation of the coating, carboxyl polyester resin and a curing agent are crosslinked to form a three-dimensional network, and filler and auxiliaries such as precipitated barium sulfate, silica powder and bismuth vanadate yellow pigment are combined, so that the mechanical strength, chemical resistance and ultraviolet aging resistance of a coating film are optimized.

The invention provides an additive for negative electrode lead paste of an ultralow-temperature lead storage battery, a preparation method of the negative electrode lead paste of the ultralow-temperature lead storage battery and the ultralow-temperature lead storage battery. The additive for the negative electrode lead paste of the ultralow-temperature lead storage battery comprises the following components in parts by mass: 4-5 parts of sodium lignosulfonate, 1-3 parts of L-cysteine, 1-2 parts of monopotassium phosphate, 2-3 parts of acetylene black, 0.5-1 part of graphene, 6-8 parts of barium sulfate, 1-2 parts of bismuth oxide and 1-1.5 parts of polyester staple fibers. According to the invention, L-cysteine and monopotassium phosphate which have a decisive effect on the realization of the ultralow-temperature capacity of an ultralow-temperature battery product are introduced, and the L-cysteine and the monopotassium phosphate are matched and cooperated to promote the realization of the ultralow-temperature charging and discharging capacity.

The invention discloses a passive radiation cooling powder coating and a preparation method of a refrigeration coating, and relates to the technical field of powder paints.The specific powder combination of titanium dioxide, barium sulfate, aluminum oxide and zirconium silicate is added into a powder coating formula, so that the solar reflectivity of the coating cured on a substrate is increased to 85% or above, and the coating has the advantages of being high in heat resistance, good in heat resistance and the like. Meanwhile, the infrared emissivity is improved to 90% or above, a synergistic cooling effect is generated, and the material is an ideal radiation refrigeration material.

A low-absorption and high-emission thermal control coating resistant to high-dose ionizing radiation and its preparation method, which relates to the field of spacecraft thermal control coatings. The thermal control coating includes a bottom coating, a middle coating, and a top coating sequentially arranged on the surface of a substrate; the bottom coating includes barium sulfate, cerium oxide, and a binder; the middle coating includes hollow glass microspheres, a binder, and an inorganic dispersant; the top coating includes indium tin oxide and a binder. It greatly increases the scattering ability of different spectral energies of sunlight and the tolerance to vacuum ionizing radiation, enabling it to meet the design requirements of high precision and long life of modern new spacecraft.

The invention provides a powder coating gypsum board with scratch resistance and a preparation method thereof, and belongs to the technical field of paints.The preparation method comprises the following steps that modified polyester, modified glass beads, polytetrafluoroethylene, barium sulfate, titanium dioxide, a flatting agent and a curing agent are mixed and stirred, melt extrusion is conducted, tabletting is conducted after cooling, smashing, grinding and sieving are conducted, and the powder coating gypsum board is obtained. Powder coating is obtained; and sanding and dedusting the surface of the gypsum board substrate, electrostatically spraying the powder coating onto the surface of the substrate, heating, curing and cooling to obtain the gypsum board. Wherein the modified polyester is prepared from polyester, a reinforcing agent and 3-glycidyl ether oxypropyl triethoxy silane. The powder coating gypsum board prepared by the invention has excellent scratch resistance, impact resistance and wear resistance.

The invention discloses a self-crosslinking exterior wall coating containing reinforcing fibers and a preparation method thereof. The coating comprises the following components by mass: 10-20% water, 0.1-0.5% bentonite, 0.1-0.5% cellulose, 3-8% reinforcing fibers, 0.5-2% ethylene glycol, 0.5-1.5% dispersant, 0.1-0.5% wetting agent, 0.1-0.3% multifunctional additive, 15-25% titanium dioxide, 8-15% precipitated barium sulfate, 2-8% silane-modified nano-silica, 5-10% water-based polyurethane emulsion, 30-40% organosilicon-modified acrylic emulsion, 1-3% film-forming aid, 0.1-0.3% bactericide, 0.1-0.2% preservative, 0.5-1% mildew inhibitor, 0.3-1.1% defoaming agent, and 0.5-1.8% leveling agent. By compounding silicone-modified acrylic emulsion and water-based polyurethane emulsion, and adding silane-modified nano-silica and reinforcing fibers, the coating has excellent resistance to artificial weathering, wear resistance, impact resistance, corrosion resistance and high hardness.

The invention discloses a carbonate reservoir fracture permeability test method, and relates to the technical field of ore exploration, the test steps are as follows: S1, blending a tracer agent: preparing iohexol, iopamidol and barium sulfate suspension, and blending to obtain the tracer agent; s2, injecting the prepared tracer agent into the rock stratum, and waiting for diffusion of the tracer agent; s3, a CT scanning device is used for scanning the rock stratum, the flowing path of the tracer agent on the rock stratum is tracked, image data are collected and obtained, and the collected data image is preprocessed; and S4, constructing a three-dimensional model of the crack network by using a three-dimensional imaging technology, displaying a three-dimensional flow path of the tracer agent in the crack, analyzing the acquired CT image data, and measuring to obtain the concentration distribution of the tracer agent at different positions. By means of the tracer agent injection method, the rock stratum fracture permeability closer to the actual situation is obtained, and a more reliable basis is provided for development and evaluation of carbonate rock reservoirs.

The invention belongs to the technical field of material chemistry, and relates to nano barium sulfate and a preparation method thereof. The invention provides a preparation method of nano barium sulfate, which comprises the following steps: adding a barium acetate solution, sulfhydrylated chitosan and sodium stearate into a sodium sulfate solution for mixing reaction, collecting the obtained product after the reaction is ended, filtering, drying and grinding to obtain the nano barium sulfate, the concentration of the sodium sulfate solution is 1.4 to 2.6 mol / L, and the concentration of the barium acetate solution is 1.4 to 2.6 mol / L; 0.05 to 0.15 g of thiolated chitosan and 0.05 to 0.15 g of sodium stearate are correspondingly added into each 100 mL of the sodium sulfate solution. The invention solves the technical problems of high particle size and non-uniform particle size distribution of nano barium sulfate particles when the nano barium sulfate particles are prepared by adopting a direct precipitation method.

The invention discloses a solvent-free epoxy anticorrosive coating and a preparation method thereof, and relates to the technical field of coatings. The invention discloses a solvent-free epoxy anticorrosive coating. The coating comprises the following raw materials in parts by weight: 40-60 parts of modified epoxy resin, 5-10 parts of modified nano zinc oxide, 15-25 parts of a polyamide curing agent, 5-10 parts of butyl glycidyl ether, 10-15 parts of titanium dioxide, 8-12 parts of talcum powder, 5-8 parts of barium sulfate, 0.5-1 part of an organic silicon defoaming agent, 0.5-1 part of an acrylate flatting agent, 1-2 parts of a silane coupling agent KH-550 and 3-5 parts of carboxyl-terminated nitrile rubber. And 1-2 parts of fumed silica. The solvent-free epoxy anticorrosive paint adopts a solvent-free formula, and is environment-friendly and low in volatility. The modified epoxy resin and the modified nano-zinc oxide have a synergistic effect, a chain is accurately controlled through'water diversion-viscosity feedback ', and molecular weight distribution is narrow. The pigment filler is uniformly dispersed at a high speed after being pretreated by the silane coupling agent, and is matched with the defoaming agent and the leveling agent, so that the coating has good leveling property, few bubbles, accurate viscosity regulation and control and stable and reliable comprehensive performance.

The invention belongs to the technical field of plastic filling modification, and discloses a high-specific-gravity polypropylene filling master batch and a preparation method thereof. The high-specific-gravity polypropylene filled master batch is mainly prepared from the following raw materials in parts by mass: 8-28 parts of polypropylene, 70-92 parts of modified barium sulfate powder, 1-4 parts of a lubricant, 4-8 parts of a titanate coupling agent, 3-6 parts of zinc stearate and 0.5-2 parts of an antioxidant. The barium sulfate powder subjected to surface modification treatment is added into the polypropylene master batch, so that the polypropylene master batch has very high specific gravity and can be filled and modified in various high polymer material products with specific gravity requirements.

The invention discloses a friction material, a brake pad and a preparation method of the brake pad. Comprising the following raw materials: 14-18 parts of modified phenolic resin, 10-15 parts of modified composite fiber, 4-7 parts of aramid fiber, 3-5 parts of rubber powder, 5-8 parts of steel fiber, 7-11 parts of graphite, 3-6 parts of aluminum oxide, 3-5 parts of silicon carbide, 4-6 parts of mica powder, 9-13 parts of potassium titanate whisker and 8-11 parts of barium sulfate. The modified composite fiber is prepared by the following steps: mixing basalt fiber and carbon fiber, coating lanthanum gadolinium oxide on the surface through hydrothermal reaction, modifying with silane, and finally reacting with 4, 5-diamino-2, 6-dimercaptopyrimidine. The friction material has the advantages of good mechanical properties, low wear rate, high thermal stability and stable friction coefficient, and is suitable for automobile brake pads.

The invention relates to the technical field of environment-friendly epoxy resin coatings, in particular to an environment-friendly high-temperature-resistant and wear-resistant epoxy resin anticorrosive coating and a preparation method of the environment-friendly high-temperature-resistant and wear-resistant epoxy resin anticorrosive coating. The component A is prepared from the following raw materials in parts by weight: 30 to 50 parts of waterborne epoxy resin emulsion, 0.4 to 0.8 part of dispersing agent, 0.3 to 0.5 part of flatting agent, 0.3 to 0.5 part of defoaming agent, 0.4 to 0.8 part of wetting agent, 0.4 to 0.6 part of thickening agent, 5 to 10 parts of anti-rust pigment, 0.3 to 0.5 part of anti-flash-rust agent, 3 to 5 parts of precipitated barium sulphate, 8 to 10 parts of modified filler and 10 to 30 parts of deionized water; the component B comprises the following raw materials in parts by weight: 3-5 parts of an epoxy curing agent and 4-6 parts of deionized water; the molar ratio of epoxy groups in the water-borne epoxy resin emulsion to amino groups in the epoxy curing agent is 1: (1.1-1.3). The epoxy resin coating prepared by the invention has excellent high temperature resistance, wear resistance and corrosion resistance.

To provide a polyvinyl chloride resin composition and a polyvinyl chloride sheet containing the composition, the composition achieving low odor while inhibiting reductions in conductivity, heat stability, and peelability.SOLUTION: The polyvinyl chloride resin composition contains a polyvinyl chloride resin, barium sulfate, talc, and a stabilizer having a melting point of 75°C or higher, and, relative to 100 pts.mass of the polyvinyl chloride resin, a total content of the barium sulfate and the talc is 3-30 pts.mass, and a content of the stabilizer is 3-15 pts.mass, and furthermore a ratio of the content of the talc to the content of the barium sulfate is 1-2.SELECTED DRAWING: None

The invention discloses a low-VOC alkyd resin coating and a preparation method thereof, belonging to the technical field of alkyd resin coatings. The low-VOC alkyd resin coating comprises the following raw materials in parts by weight: 55-75 parts of a branched alkyd resin, 2-4 parts of an amine neutralizer, 0.05-0.1 parts of a defoamer, 0.3-0.5 parts of a dispersant, 8-15 parts of precipitated barium sulfate, 50-70 parts of deionized water, 0.3-1 parts of a leveling agent, and 0.3-0.5 parts of a drier; the branched alkyd resin, the deionized water, and the amine neutralizer are stirred and mixed for 40-45 minutes to obtain a water-dispersible resin body; and the water-dispersible resin body is uniformly mixed with the defoamer, the dispersant, the precipitated barium sulfate, and the remaining deionized water to obtain a low-VOC alkyd resin body. The preparation method is simple, the low-VOC alkyd resin body is water-based, and only a small amount of safe and environmentally friendly cosolvent is used. The final coating has a VOC content of less than 80 g / L, has high content and low viscosity, does not require the use of an organic diluent, and has the characteristics of fast drying, strong water resistance, and the like.

The invention discloses a low-energy-consumption polyurethane powder coating and a preparation method thereof, and belongs to the technical field of polyurethane powder coatings. Comprising the following raw materials in parts by weight: 60-70 parts of polyester polyol, 10-20 parts of a closed HDI tripolymer, 5-10 parts of a flame retardant aid, 1-2 parts of a flatting agent, 2-3 parts of an anti-yellowing agent, 0.5-1.5 parts of a dispersing agent, 0.4-0.8 part of a degassing agent and 8-12 parts of superfine barium sulfate. The low-hydroxyl-value polyester polyol and the closed HDI tripolymer are matched for use, so that the temperature and time required in the curing process are greatly reduced, and the energy consumption is reduced; the self-made flame-retardant additive can effectively improve the flame-retardant property of the coating, reduce the fire risk and prolong the service life; in conclusion, the prepared coating achieves the dual purposes of energy conservation, environmental protection, safety and flame retardance, and has important application value in the field of polyurethane powder coatings.

The application relates to the field of shoe-making moulds and high polymer foaming forming technology, and discloses a running type basketball shoe tree and a production process thereof. The shoe tree is made of raw materials containing the following components by weight: high-density polyethylene, ethylene-1-octene copolymer, precipitated barium sulfate, dicumyl peroxide, divinylbenzene and powder pre-dispersed foaming agent. The production process of the shoe tree comprises the following steps: constant temperature closed mixing, melt extrusion and air cooling and granulation of all the materials to obtain base rubber particles, injection of the rubber particles into a mould after heating to complete chemical crosslinking and microporous foaming, superposition of a sinusoidal servo pressure maintaining flow field on the material to implement mechanical kneading of the material to promote molecular chain segment relaxation and rearrangement when the temperature is lowered to the semi-cured window period, and finally forced cooling and shaping in a tree to obtain the shoe tree. Through polymer blending and heterogeneous nucleation, and in combination with the sinusoidal servo flow field mechanical kneading to eliminate residual stress, the size precision and mechanical support consistency of the shoe tree are improved.

The invention relates to the technical field of biomedical materials, in particular to hydrogel as well as a preparation method and application thereof. The hydrogel is obtained by crosslinking a polymer framework material, a functional additive and a shielding agent, the polymer framework material comprises any one or more of gelatin, carboxymethyl chitosan, hyaluronic acid, chitosan, collagen, polyvinyl alcohol, sodium carboxymethyl cellulose and sodium alginate; the functional additive comprises any one or more of tannic acid, tea polyphenol, vitamin C and procyanidine; the shielding agent comprises any one or more of barium sulfate, bismuth simple substance and bismuth-containing compound. The hydrogel provided by the invention can effectively isolate radiotherapy rays, reduce oxidative stress reaction, provide a protective barrier for normal tissues in a radiotherapy process and reduce radiation damage, has excellent tissue repair promotion capability, is safe in components, fast in metabolism and adjustable in flowability and adhesion, and is more beneficial to adaptation in rectum or skin tissues.

The present application relates to the technical field of lead-acid battery preparation, and particularly relates to a green plate gel battery and a preparation process thereof, which comprises positive plate lead paste and negative plate lead paste, the positive plate lead paste comprises the following components: lead powder 100 parts, short fiber 0.08-0.12 parts, sulfuric acid 6.5-8.0 parts, and water 11-14 parts; the negative plate lead paste comprises the following components: lead powder 100 parts, sulfuric acid 5-6 parts, short fiber 0.05-0.1 parts, composite activated carbon 0.5-3 parts, sodium lignosulfonate 0.6-0.8 parts, barium sulfate 0.2-0.4 parts, humic acid 0.1-0.3 parts, and water 11-14 parts. The gel battery prepared by introducing the composite activated carbon into the negative plate lead paste and synergizing with the composite expansion agent system has a significant improvement in initial capacity and deep cycle life.