115results about How to "High expansion ratio" patented technology

The invention discloses a water-based ultra-thin fire-retardant coating for steel structures. The fire-retardant coating comprises components as follows: a binder emulsion, an intumescent flame retardant system, filler, deionized water and additives, wherein the additives comprise a dispersing agent, an antifoaming agent, a mold inhibitor, an anti-flash-rust agent, a coalescing agent, a leveling agent and a thickener; the intumescent flame retardant system comprises a dehydration catalyst, a carbonizing agent and a foaming agent. The invention further designs a preparation method of the water-based ultra-thin fire-retardant coating for the steel structures. The components are mixed sequentially to be prepared into the water-based ultra-thin fire-retardant coating for the steel structures in a vertical sand mill and a dispersing tank. The prepared coating is large in adhesive force, high in hardness, good in fireproof property, good in anti-scratch performance and excellent in weather resistance and water resistance, the surface layer of the coating is fine and smooth, the decoration performance is improved significantly, and the preparation method is low in energy consumption and has the advantages that the harm to human bodies and the pollution to the environment during preparation are small and the like.

The invention provides high-temperature expanded polymer microspheres and a preparation method thereof and belongs to expandable particles. The high-temperature expanded polymer microspheres are prepared from a thermoplastic resin shell body and a foaming agent packaged in the shell body, wherein an oil-phase composition composed of a polymerizable monomer and a crosslinking agent can be dispersedinto a water-phase dispersed composition; in the presence of the foaming agent, the polymer microspheres coated with the foaming agent are directly prepared through carrying out suspension polymerization reaction and coating the foaming agent in situ; the high-temperature expanded polymer microspheres are characterized in that the oil-phase composition contains the polymerizable monomer and the crosslinking agent, and also comprises a silane coupling agent; the foaming agent is a mixture of isopentane, isooctane and n-octane; the high-temperature expanded polymer microspheres provided by theinvention have the advantages of complete core-shell structure, uniform grain diameter distribution, high foaming agent coating efficiency, good heat resistance of a shell-layer polymer, relatively high initial temperature in an expansion process, relatively high highest expansion temperature and high foaming ratio, have a relatively wide foam stabilizing temperature range, and are suitable for being applied to a thermoplastic resin, rubber or thermoplastic elastomer foaming and processing technology.

The invention belongs to the technical field of sealing materials and relates to a method for preparing polyurethane/rubber interpenetrating network type water-swellable rubber. The method comprises the following steps: firstly, mixing rubber and super-absorbent resin for 10 to 40 minutes in an open mill; further adding solid softener, colorant, anti-ager and promoter to the open mill, and mixing for 10 to 40 minutes; then, adding zinc oxide, reinforcing agent and plasticizer to the open mill, and mixing for 10 to 50 minutes; further adding vulcanizer to the open mill, and mixing to obtain a mixture A; evenly mixing polyethylene glycol and MDI (methyl-di-p-phenylene isocyanate) by equal molar weight to obtain a mixture B; blending the mixture A and the mixture B in the open mill to obtain a product; and finally, vulcanizing the product in a mold on a plate vulcanization machine with the temperature and pressure being respectively controlled at 150 to 160 DEG C and at 10MPa to 15MPa, to obtain the interpenetrating network type water-swellable rubber. The method of the invention has the advantages of simple preparation process, high product expansion ratio, high ion resistance and controllable water absorption rate and mechanical properties.

The invention relates to a thermally-expandable polymer microsphere for polyvinyl chloride resin foaming and a preparation method thereof, and belongs to the field of expandable particles. The thermally-expandable polymer microsphere consists of a thermoplastic resin shell and a foaming agent encapsulated in the shell; an oil phase composition composed of a polymerizable monomer and a crosslinkingagent is dispersed in an aqueous phase dispersion composition; and in the presence of the foaming agent, the foaming agent is coated in situ through a suspension polymerization reaction to directly prepare the polymer microsphere coated with the foaming agent. The thermally-expandable polymer microsphere is characterized in that the oil phase composition comprises a silane coupling agent in addition to the polymerizable monomer and the crosslinking agent, and the foaming agent is a mixture of isopentane, isooctane and n-octane. The invention provides a thermally-expandable polymer microspherewhich has the advantages of complete core-shell structure, uniform particle size distribution, high foaming agent coating efficiency, good heat resistance of a shell polymer, high initial temperatureduring expansion, high maximum expansion temperature, high foaming ratio, and wide foam stabilizing temperature range, and is special for foaming polyvinyl chloride resin.

Ultrathin steel structure waterproof coating is characterized by being made from the following materials according to parts by weight: 5-20 parts of nano silicon dioxide aerosol, 15-45 parts of acrylic emulsion, 30-80 parts of melamine, 30-60 parts of pentaerythritol, 50-80 parts of ammonium polyphosphate, 10-15 parts of titanium dioxide, 5-15 parts of sepiolite fiber, 5-15 parts of talc, 5-15 parts of expansible graphite, 0.2-0.8 part of a waterborne wetting dispersant, 0.02-0.08 part of modified organic bentonite, and 0.05-0.2 part of a waterborne leveling agent. The preparation method comprises: weighing the components according to their ratio; adding the components sequentially into a high-speed dispersing machine for mixing and dispersing; standing and aging for 10-15 h; metering and packaging. The fireproof coating of the invention can reduce the increase in the steel structure loading to the coating and has no influence in the expanding and foaming process, expansion rate of a coating layer is high, heat isolating capacity of the fireproof coating can be improved greatly, and fire resistance of a steel structure can be improved greatly.

The invention relates to a method for preparing a polyurethane elastomer capable of rapidly expanding when contacting water, which comprises the following steps of: preparing a hydrophilic polyurethane prepolymer and a hydrophobic polyurethane prepolymer in a component A; then preparing a component B, namely an epoxy resin modified triethylene tetramine waterborne curing agent; and calculating mass parts of the components A and B according to the molar ratio of isocyanate groups to active hydrogen groups of 1:0.8-0.9, adding 0 to 0.5 mass part of black paste, uniformly mixing, carrying out vacuum defoaming, pouring into a die of which the temperature is 120 DEG C, heating, pressurizing and vulcanizing to obtain the polyurethane elastomer material capable of rapidly expanding when contacting water. Compared with other polyurethane elastomers capable of expanding when contacting water, the polyurethane elastomer material capable of expanding when contacting water, which is prepared by the method of the invention, has the advantages that: expansion multiplying power and expansion speed are high, expansion rate in fresh water can reach 400 to 600 percent, hardness can reach Shore A 40 to 60, tensile strength can reach 4.0 to 6.0MPa and time required for total expanding is 120 to 240 minutes; and the elastomer material has excellent mechanics characteristic and water expansibility and is convenient to use. The mass fraction of the components A and B is calculated according to the molar ratio of the isocyanate groups to the active hydrogen groups of 1:0.8-0.9 and the components A and B are uniformly mixed and the mixture is directly used for in-site concreting, solidification and sealing.

The present invention provides a foam comprising (a) a polylactic acid resin, (b) at least one thermoplastic resin selected from a polyolefin resin and a polystyrene resin, and (c) a block copolymer of a vinyl aromatic compound and a conjugated diene, wherein a ratio of (a) to (b) by weight (a/b) is 80/20 to 20/80, and the foam comprises 0.5 to 20 parts by weight of (c) with respect to 100 parts by weight of (a) and (b) in total.

Provided is a process for producing expanded polyolefin resin particles whose cells are not made nonuniform or extremely smaller as seen in conventional expanded particles, whose cell diameter and expansion ratio can be easily controlled independently, and which, when subjected to in-mold expansion molding, give in-mold expanded molded products satisfactory in fusibility and excellent in surface properties. The process is a process for producing expanded polyolefin resin particles by: dispersing polyolefin resin particles together with an aqueous dispersion medium into a closed vessel; heating the polyolefin resin particles up to or above a softening temperature of the polyolefin resin particles; and releasing the polyolefin resin particles into a zone whose pressure is lower than an internal pressure of the closed vessel, with use as a foaming agent of water serving as the dispersion medium, the polyolefin resin particles being composed of a polyolefin resin composition including: polyolefin resin; a substance selected from among polyethylene glycol, polyvalent alcohol having a carbon number of not less than 3 to not more than 6, and a water-absorbing substance having no function of forming foaming nuclei; and a foam nucleating agent.

The invention provides oil-absorptive resin and oil-absorptive expanding rubber comprising the same. The oil-absorptive resin comprises the following components in parts by weight: 60 to 75 parts of polymer monomer, 0.5 to 2.5 parts of catalyst, 0.5 to 1 part of initiator, 0.01 to 0.03 part of cross-linking agent and 25 to 30 parts of dispersing phase. The invention also provides expanding rubber comprising the oil-absorptive resin. The oil-absorptive expanding rubber comprises the following components in parts by weight: 100 parts of rubber, 40 to 100 parts of oil-absorptive resin, 40 to 80 parts of reinforcing agent, 10 to 20 parts of softening agent, 0.5 to 2 parts of vulcanizing agent, 0.5 to 2 parts of promoter, 0.5 to 2 parts of anti-aging agent and 6 to 8 parts of active agent. By utilizing the characteristic of the oil-absorptive resin that the oleophylic group (ester group) is interactively affine to oil molecules to absorb the oil, the prepared oil-absorptive resin has porosity, so that the expanding rubber utilizing the oil-absorptive resin has better oil-absorptive effect in comparison with the traditional oil-absorptive expanding rubber, and the pressure resisting effect is also improved.

The invention relates to an aqueous indoor smoke-free fire-proof coating, which comprises the following components in parts by weight: 20-28 parts of water, 3-5 parts of multi-wall carbon nanotube, 2-3 parts of 10 percent sodium hexametaphosphate, 0.1-0.2 parts of antifoaming agent, 0.1-0.2 parts of wetting agent, 0.1-0.5 parts of filming auxiliary agent, 0.1-0.3 parts of dispersing agent, 10-20 parts of dehydration catalyst, 8-10 parts of foaming agent, 7-85 parts of carbonizing agent, 10-14 parts of smoke suppression flame retardant, 11-15 parts of titanium dioxide, 11-23.5 parts of acetic styrene-acrylic emulsion, 0.2 parts of bactericide, 0.6-1.2 parts of thickening agent and 0.1-0.2 parts of adjusting agent. The multi-wall carbon nanotube modified by amphiphilic polymer is added, so that the strength and the expansion ratio of a charring layer after firing of the fire-proof coating are improved.

The invention relates to microencapsulated expandable graphite, which is melamine resin-epoxy resin double-coated expandable graphite, which is characterized by firstly coating a melamine microcapsule outside the expandable graphite, and then coating the microencapsulated expandable graphite with the melamine resin-epoxy resin double-coated expandable graphite of an epoxy resin microcapsule. The microencapsulated expandable graphite can be used as a fire retardant for preparing rigid polyurethane foam, and the prepared rigid polyurethane foam has the density being around 60kg.m<-3>, the heat conductivity coefficient being around 0.03W.(m.k)<-1>, the compression strength being around 0.60MPa, and the limit oxygen index being approximate to 30 percent. The invention discloses a preparation method of the microencapsulated expandable graphite.

In the present invention, resin expending on water absorption is prepared by polymerization of synthetic monomer of propenoic acid ester containing polyoxyvinyl ether, catalyst, initiator and cross-linking agent; rubber expending on water contact is prepared from resin expending on water absorption, polychloroprene, filler, softener, promoter and antiager through mixing and valcanizing.

The invention provides an environment-friendly fireproof material for electrical equipment and a preparation method of the environment-friendly fireproof material, and belongs to the fields of fireproof materials and preparation technologies thereof. The environment-friendly fireproof material for the electrical equipment is characterized by being prepared from the following raw materials in parts by weight: 50 to 60 parts of modified epoxy resin, 30 to 40 parts of fluorocarbon resin, 60 to 90 parts of a fire retardant, 3 to 10 parts of expanded graphite, 3 to 10 parts of alumina silicate fiber and 2 to 8 parts of molecular sieves. The fireproof material provided by the invention is applied to fire protection of the electrical equipment, and is high in crack resistance, water resistance and weather resistance and good in expansion character; meanwhile, the heat release rate of a base material in a burning condition can be obviously reduced, and the quality loss is reduced; moreover, the fireproof material is small in smoke production quantity and good in environmental protection effect.

The invention discloses controlled-release antibiotic expanded acrylic bone cement prepared by mixing a solid phase and a liquid phase according to a ratio of 1g: (0.6ml-0.9ml), wherein the solid phase includes polymethyl methacrylate, antibiotic loaded microspheres with expandable core-shell structures and barium sulfate which are in the mass ratio of (5-7): (2.1-4.5): (0.5-0.9), and the antibiotic loaded microspheres with expandable core-shell structures contain carboxylated graphene; and the liquid phase includes methyl methacrylate, an accelerant and a retardant which are in the mass ratioof (8.5-9.5): (0.25-0.5): (0.25-1). The invention further discloses a preparation method of the controlled-release antibiotic expanded acrylic bone cement. The bone cement prepared by using the method has a better expansion ratio, also has a sensitive pH response function and is capable of realizing long-acting drug release as required according to the pH change of a microenvironment surroundingan implant, so that the release ratio of antibiotics is increased.

The invention provides biodegradable polylactic acid foamed particles taking PDLA as a matrix material or taking PDLA and PLLA as matrix materials. A preparation method of the polylactic acid foamed particles include: (1), subjecting the PDLA, the PLLA, a plasticizer and a foam nucleating agent to mixing, extruding, wiredrawing and pelletizing to obtain polylactic acid foamed masterbatch; (2), putting the polylactic acid foamed masterbatch into a reaction kettle, feeding fluid serving as a foamer into the reaction kettle, holding for a period of time at 0-40 DEG C and 0.2-6MPa, and lowering pressure in the reaction kettle to normal pressure; (3), adopting a temperature rising method to foam the polylactic acid foaming masterbatch after being treated in the step (2) to obtain the polylacticacid foamed particles. By the preparation method, biodegradability of the polylactic acid foamed particles and polylactic acid foamed products prepared from the same can be improved.

The invention relates to a method for preparing low-leaching-rate water-swellable rubbers. The prepared low-leaching-rate water-swellable rubber comprises the following raw materials in parts by weight: 100 parts of obtained modified rubbers, 10 to 40 parts of obtained super water absorbent resins, 5 to 30 parts of plant fiber powder, 2 to 8 parts of zinc oxide, 0.2 to 1 parts of stearic acid, 1 to 5 parts of sulphur, 0.5 to 4 parts of dibenzothiazyl disulfide, 10 to 80 parts of filler, and 5 to 50 parts of softener, and the method comprises the following steps: mixing the raw materials for 5 to 60 minutes; standing the obtained mixture for 10 to 12 hours; and carrying out vulcanization and pressure molding on the obtained deposit so as to obtain the low-leaching-rate water-swellable rubbers. The rubbers prepared by using the method of the invention have the characteristics of high expansion ratio, low leaching rate and good water retention performance. The invention overcomes the defects that strongly polar bibulous trees subjected to soaking in traditional water-swellable rubbers are easy to desorb from the rubbers, and the expansion rate of the traditional water-swellable rubber after used repeatedly is reduced; and the preparation method is simple, and low in equipment requirement.

The invention discloses a foamed polypropylene bead containing a beta crystal, belonging to the field of foamed materials. The foamed polypropylene bead containing the beta crystal comprises, by weight, 100 parts of polypropylene resin, 0.2 to 5 parts of beta nucleating agent master batch, 0.5 to 2 parts of an antistatic agent and 1 to 10 parts of a foaming nucleating agent. The invention also discloses a preparation method for the foamed polypropylene bead. According to the invention, a high-pressure fluid is used as a foaming agent; autoclave foaming technology is employed; double or multiple melting peaks including alpha and beta are formed through introduction of the beta crystal into a polypropylene particle, the foamed polypropylene bead and a foamed polypropylene bead preform material; the foamed polypropylene bead with a low foaming temperature and a high expansion ratio is prepared in virtue of the characteristics of low melting point/low crystallization temperature, small crystal size and high crystal density of the beta crystal; and the foamed polypropylene bead preform material containing the beta crystal has high tensile strength, increased by 15 to 50% compared with samples of a same kind under the condition of same density.

The invention discloses light polyether-ether-ketone or a composite material thereof with different degrees of crystallinity thereof and a preparation method thereof and belongs to the technical field of preparation of high molecular materials. The preparation method comprises the following steps of: putting polyether-ether-ketone or the composite material thereof in a near critical or supercritical CO2 fluid, swelling and permeating the same at 320-360 DEG C and the saturated pressure of 5-30MPa for 30min to 3h, then quickly unloading to constant pressure and cooling to room temperature; and repeating the operations for 1-3 times and finally performing annealing treatment to obtain the light polyether-ether-ketone or the composite material thereof with different degrees of crystallinity, different bubble dimensions and high foaming rates. The preparation method disclosed by the invention overcomes defects that crystallized polyether-ether-ketone or the composite material thereof prepared in the prior art is small in foaming swelling rate, single in bubble dimension, hard to saturate gas and the like, expands the application field of polyether-ether-ketone, and improves the bottleneck of existing crystallized polyether-ether-ketone or the composite material thereof in the foaming technology.

The invention discloses a micro-arc oxidation composite aqueous fire retardant coating and a preparation method thereof. A micro-arc oxidization film layer is formed on the surface of a valve metallicmatrix by using a micro-arc oxidation method by adopting alkaline electrolyte, and then an aqueous fire retardant coating is compounded on the surface of the micro-arc oxidization film layer, whereinthe coating takes ammonium polyphosphate, pentaerythritol and melamine as a flame-retardant system, titanium dioxide as a pigment filler, and water as a solvent. When meeting fire, the flame-retardant system of the aqueous fire retardant coating on the outer layer achieves concerted reaction to form a dense spongy expanded carbonaceous layer, a two-dimensional lamellar structure of graphene oxideundergoes multilayer stacking in the carbonaceous layer to form a dense physically blocked layer so as to isolate transfer of outside heat to the inner layer, while the heat conductivity of the micro-arc oxidization film layer on the inner layer is low, so as to further isolate transfer of the heat to the matrix. The micro-arc oxidation composite aqueous fire retardant coating has excellent fireretardant and heat insulating performances, is applicable to valve metals of aluminum, magnesium, titanium and the like, and is strong in binding force, simple and environment-friendly in processing technology and low in cost.

The invention discloses a double-component expansion type fireproof coating which consists of a component A and a component B, wherein the component A consists of the following raw materials in partsby weight: 14-18 parts of an epoxy resin, 2-3 parts of an amino resin, 0.2-0.6 part of bentonite, 0.2-0.5 part of a defoaming agent, 0.2-0.5 part of a dispersant, 8-11 parts of titanium dioxide, 6-10parts of flame-retardant filler, 4-6 parts of expanded graphite, 20-30 parts of Ammonium Polyphosphate, 5-9 parts of melamine, 5-9 parts of pentaerythritol, 2-3 parts of reinforcing filler, 11-12 parts of xylene and 3-5 parts of butanol; and the component B is a modified polyamide epoxy curing agent. The fireproof coating is excellent in flame retardancy, high in mechanical strength and excellentin water resistance.

The invention discloses an extendable square cabin. The extendable square cabin mainly adopts a large-plate square cabin form, the unfolding and the folding of the extendable square cabin are realized through the folding and the rotating of a sheet material, the extension proportion is higher, the extension form is innovative, and an outer side plate of an extension box body is perpendicularly connected to the outer end of a sliding track of the extension box body, so that the connection between other plates in the extension box body and the outer side plate of the extension box body is closer. The extendable square cabin disclosed by the invention adopts a container form, and a retractable landing leg is arranged at the bottom of a main box body, so that the extendable square cabin can be steadily fixed on the ground and can be suitable for different ground conditions; certainly, the extendable square cabin disclosed by the invention can also be fixedly built on the chassis of a vehicle or the chassis of a trailer, and regulation of relevant components such as the sliding track of the extension box body, the retractable landing leg and hoisting anchor points is only needed; in addition, sealing of rubber pads does not exist among all the plates of the extension box body disclosed by the invention, so that the extendable square cabin has a good sealing property during full extension.

The invention relates to a preparation method of a high-power foamed polypropylene plate, which comprises the following steps: step 1, placing polypropylene particles in a constant-temperature mold cavity, filling supercritical fluid, carrying out pressure-maintaining permeation and swelling on the polypropylene particles, and forming a polymer-supercritical fluid homogeneous system after reaching an equilibrium state; step 2, cooling the polymer-supercritical fluid homogeneous system, and standing the polymer-supercritical fluid homogeneous system after cooling until the polymer-supercritical fluid homogeneous system is stable; and step 3, releasing pressure and foaming to obtain the polypropylene foamed board. According to the preparation method, the production efficiency is high, the process time is 15-45 min, and the product foaming ratio is high; the prepared polypropylene foamed sheet can be used for a long time at the temperature of-50 to 120 DEG C; and the prepared high-power foamed polypropylene plate is high in expansion rate which can reach 40-60 times, the cell diameter is 150-300 microns, and the foamed sheet is an ultra-light material with excellent performance.

The invention relates to the technical field of high polymer materials. The invention provides a preparation method of acrylic resin thermal expansion foaming microspheres. According to the method, methyl methacrylate is used as a main monomer and is subjected to suspension copolymerization with isobornyl methacrylate and N-vinylformamide monomers under the normal pressure at 0-5 DEG C to preparethe thermal expansion foaming microspheres. The production process is simple, safe, low in energy consumption and low in equipment requirement, and then the production cost can be reduced. The invention also provides a formula composition for preparing the thermal expansion foaming microspheres, the microsphere product produced according to the formula does not contain nitrile group and halogen component, the microsphere product has the advantages of high expansion ratio, moderate foaming temperature, stable foaming performance and the like, and the microsphere shell has good mechanical property and sealing property.