48results about How to "Uniform cell size" patented technology

The invention provides a supercritical CO2 micro-foaming polylactic acid/wood-flour composite material and a preparation method of the supercritical CO2 micro-foaming polylactic acid/wood-flour composite material, and relates to a micro-foaming composite material and a preparation method of the micro-foaming composite material, solving the problems of common wood-plastic composite material that the density is high, the impact strength is low, and the resulting waste is easy to pollute the environment. The preparation method comprises the following steps: getting raw materials such as polylactic acid, wood flour, a coupling agent, a toughening agent and a lubricant; mixing the raw materials in a high-speed mixer based on a certain ratio; melting and blending by a two-roll mill; preparing a sample by compression molding; then swelling the sample by adopting the supercritical carbon dioxide as the foaming agent; and finally quickly releasing the pressure, thus obtaining the micro-foaming polylactic acid/wood-flour composite material. The supercritical CO2 micro-foaming polylactic acid/wood-flour composite material has the advantages that the temperature for foaming is low, the pressure is held within a short time, a cellular structure is easy to control, and the prepared micropore composite material is small in aperture and high in cellular density; and the supercritical CO2 micro-foaming polylactic acid/wood-flour composite material is a green and environment-friendly foaming material with good performance.

The invention discloses a method for preparing a polyetherketone foaming material by using supercritical CO2. The method specifically comprises: taking fluid CO2 in supercritical state as a physical foaming agent to perform physical foaming on polyetherketone, saturating a polyetherketone sheet material in an autoclave, and realizing foaming on the saturated polyetherketone sheet material in high-temperature oil bath to obtain a closed-cell foamed material with uniform cell distribution, wherein the cell size can be changed through the technological conditions. By taking polyetherketone as the raw material and using the green environment-friendly foaming method, the obtained high-temperature resistant polymer is not only guaranteed in the original excellent performances, but also substantially reduced in production cost, and is a foaming material with a wide application prospect.

The invention discloses a high-strength and high-flame retardation polyurethane composite heat insulation plate. The high-strength and high-flame retardation polyurethane composite heat insulation plate comprises two backing layers and a polyurethane heat insulation layer positioned between the two backing layers, the polyurethane heat insulation layer is made of a high-performance polyurethane foam material, and raw materials of the high-performance polyurethane foam material comprise a component A and a component B according to a weight ratio of 2:1.2-2.3; raw materials of the component A comprise polyether polyol, pentamethyldiethylenetriamine, trimethylolpropane, pentaerythritol, polyethylene glycol, an organic bismuth catalyst, cyclohexane, water, an organosilicon foaming stabilizer, amino modified carbon nanotubes, expanded perlite, hollow glass micro-beads, silicon whiskers, nanometer aluminum hydroxide, trichloroethyl phosphate, piperazine pyrophosphate, a phosphamide fire retardant, epoxy resin and polyvinyl chloride; and raw materials of the component B comprise diphenylmethane diisocyanate and hexamethylene diisocyanate.

A continuous process of making polyetherimide foam materials and articles that include these foam materials. The continuous process is a foam extrusion process that uses selected blowing agents, equipment design and processing conditions to continuously produce extruded foam with a substantially uniform cell size in a wide range of cell densities. Subsequent heating may be used in certain embodiments to remove any residual components from the foam, such as any blowing agents or nucleating agents. Due to the greater densities as well as the characteristics inherent in polyetherimide articles, the resulting foam materials are suitable for a much broader range of applications. The continuous process provides a more cost effective product while also avoiding the use of Freon and/or other agents potentially harmful to the environment.

The invention relates to a tread rubber material for a snow tire. 0.2wt%-4.0wt% of pre-expanded submicrospheres are dispersed in the tread rubber material; further, the tread rubber material in the formula is prepared from components in parts by weight as follows: 100.0 parts of rubber, 60.0-90.0 parts of reinforcing filler, 3.0-8.0 parts of an active agent, 0.0-6.4 parts of a sulfur-containing organosilicon compound, 0.5-4.5 parts of an anti-aging agent, 1.0-2.5 parts of protective wax, 20.0-45.0 parts of rubber operating oil, 0.8-2.5 parts of sulfur (in terms of pure sulfur content), 0.8-3.5 parts of an accelerant, 1.0-7.0 parts of pre-dispersing master batch of the pre-expanded submicrospheres and 0.1-0.4 parts of an anti-scorching agent. According to the tread rubber material for the snow tire, the pre-expanded submicrospheres are utilized to replace a chemical foaming agent, cell size and distribution are uniform, and outstanding on-ice slipping resistance can be realized in the whole life cycle of the tire; the formal design is flexible, the raw material selection range is enlarged, the processing conditions are easy, the safety is improved, and the quality is stable.

The invention relates to the technical field of latex foamed products, in particular to a method for producing a latex foamed product by using low-protein latex. The natural latex foamed product is prepared from the following raw materials in parts by weight: 100 parts of latex, 2-5 parts of a vulcanizing agent, 0.5-6 parts of a foaming agent, 1-5 parts of a foam stabilizer, 0.5-1.5 parts of a gelatinizing agent, 3-5 parts of an active agent, 3-12 parts of an auxiliary agent and 1-15 parts of a filler. The natural latex in the preparation raw materials of the natural latex foamed product provided by the invention is low-protein natural latex, and has the characteristics of nature, environmental protection, no pollution, no toxicity, antianaphylaxis and the like. Proper amounts of the foamstabilizer and the active agent are added in the production and preparation process of the latex foamed product; meanwhile, the production process parameters are changed, so that the prepared latex foamed product has good foam stability, uniform foam pore size, regular and stable pore structure, few internal defects and the like, the prepared foamed product has good resilience, and the tensile strength, elongation at break, resilience rate and the like are remarkably improved.

The invention discloses a production method of polyether ketone and modified nano silicon dioxide foaming materials and by supercritical carbon dioxide. The production method comprises the following steps of enabling fluid carbon dioxide in the supercritical state to be utilized as physical foaming agents and modified nano silicon dioxide to be utilized as nucleating agents to perform physical foaming on polyether ketone; enabling polyether ketone and modified nano silicon dioxide sheets to be saturated in an autoclave; achieving foaming of the saturated polyether ketone sheets in a high temperature oil bath to obtain closed-cell foaming materials with uniformly distributed foaming cells, wherein the size of the foaming cells can change through process conditions. According to the production method of the polyether ketone and modified nano silicon dioxide foaming materials and by the supercritical carbon dioxide, the polyether ketone is utilized as raw materials and the green and environment-friendly foaming method is utilized to obtain high temperature resistant polymers, so that the original excellent performance is guaranteed, the production cost is greatly reduced, and accordingly the polyether ketone and modified nano silicon dioxide foaming materials are wide in application prospect.

The invention discloses a foaming technology of inorganic nanoparticle modified polypropylene. The technology comprises the steps of 1, conducting melt blending extrusion on uniformly mixed polypropylene PP and inorganic nanoparticles to obtain polypropylene/nanoparticle granules of which diameter is 2-4 mm and length is 2-5 mm; 2, putting the polypropylene/nanoparticle granules into a high pressure reactor, pumping carbon dioxide into the high pressure reactor, raising the temperature to an infiltration temperature of 170-180 DEG C, continuing to pump carbon dioxide into the high pressure reactor until a saturation pressure reaches 20-28 MPa, and maintaining the pressure for 20-50 min; 3, reducing the high temperature to a foaming temperature of 105-165 DEG C, maintaining pressure constant in a temperature raising process, and conducting heat preservation for 40-90 min; 4, decompressing to an ordinary pressure in 10 seconds, taking out a foaming material to put into an ice and water mixture to be subjected to quenching. According to the technology, by adding nanosilicon dioxide or nano mica granules into PP, the foaming capacity of polypropylene is strengthened, and the size of a foam hole is uniform.

The invention discloses a low-thermal-conductivity polyimide foam material and a preparation method thereof. The method comprises the following steps: mixing aromatic dianhydride with a polar solvent,dissolving under a heating condition, adding low-molecular-weight alcohol, and continuously heating to carry out esterification on each component to obtain an esterification precursor solution; adding a catalyst, a foaming agent, a surfactant, polymer polyol and a foaming agent, uniformly dispersing to obtain a foaming white material, finally adding isocyanate into the white material, quickly stirring for uniform dispersion, then putting the mixture into a mold, foaming and molding, and heating and curing after foaming is finished to obtain the polyimide foam material. The polyimide foam material prepared by the method has the advantages of low heat conductivity coefficient, high limit oxygen index, good flame retardance, uniform cell size, controllable density and high mechanical strength, and can be widely applied to the fields of aerospace, military ships and warships, building insulation, vehicle construction and the like.

The invention relates to a 2,5-furandicarboxylic-acid-based polyester foam material and a preparation method thereof. The preparation method comprises the following steps: (a) placing 2,5-furandicarboxylic-acid-based polyester plastic in a mold, pressing the same into a laminated preform, and quenching the laminated preform; (b) placing the quenched preform and a first foaming agent in a closed container without contact, wherein the first foaming agent is at least one of chloroform, acetone, diethyl ether, pentane and hexafluoroisopropanol; (c) introducing a second foaming agent into the closed container, wherein the second foaming agent is at least one of carbon dioxide and nitrogen, and the temperature in the closed container is maintained at 40 DEG C to 65 DEG C, so that the first foaming agent is changed into a gas state from a liquid state, the pressure in the closed container is 1 MPa to 6 MPa, and the pressure maintaining time is 4 h to 15 h; (d) removing the gas in the closed container, taking the preform out and placing in a foaming medium to be foamed, and cooling to obtain the 2,5-furandicarboxylic-acid-based polyester foam material with the cell size of 5 microns to 50microns and the expansion multiple of 2 to 15 times.

The invention provides a method for preparing an open-cell ZIF-8/polymer composite foam material by using a solid-phase shearing and milling technology. The method comprises the following steps: mixing 40-60 parts of piezoelectric polymer granules and 60-40 parts of water-soluble salt granules in total 100 parts, adding the mixture into a millstone type mechanochemical reactor for milling and crushing, then preparing a block body by using a forming process, adding a water-soluble salt into a block, soaking the block into deionized water until the water-soluble salt is completely dissolved, soaking the obtained piezoelectric polymer foam into a ZIF-8 diluted solution, and standing and freeze-drying to obtain the ZIF-8/polymer composite foam material. The ZIF-8/polymer composite foam material obtained by the method has better mechanical property and flexibility, and when the ZIF-8/polymer composite foam material is used as a foam bone material, the piezoelectric effect can be exerted under the stress effect while an osteogenesis space is maintained in an oral stress environment, and continuous micro-current stimulation promotes osteogenesis in an operation area.

The present invention relates to a new process for creating foam in a process for manufacturing a paper or board product. According to the present invention, certain types of antimicrobial starch is used in the creation of the foam.

The invention relates to a luminescent material, a preparation method thereof and a foaming product, the foaming material is mainly prepared from poly-4-methyl-1-pentene and a reinforcing agent through a supercritical foaming process, and the particle size of the reinforcing agent is 40-100 nm. The foaming material has excellent impact strength and compression strength.

The invention discloses a polylactic acid foaming method. The polylactic acid foaming method comprises the following steps that A, a gas-generating agent is dissolved into water to prepare a solution;B, monomer or oligomer, a thermal crosslinking agent are mixed with the aqueous solution of the step A to obtain an initial reaction mixed solution, and after the initial reaction mixed solution is frozen and dried in a freeze drying device, grinding is conducted; C, polylactic acid resin and the ground initial reaction mixture powder obtained in the step B are uniformly mixed; D, the uniformly mixed material in the step C is added into an extruder, process parameters of the extruder are set for melt extrusion, the gas-generating agent is heated and generated expansion during the extrusion process, and a polylactic acid melt displays a foaming state; and E, the polylactic acid melt in the step D is extruded through the extruder and the polylactic acid foaming material is obtained after cooling and shaping. The foaming method is simple and efficient, no special equipment is needed, the cost is low, the operation is easy, the control is easy, and the obtained foaming material is stablein quality, uniform in the foam size, and high in the foaming rate.

The invention relates to a foaming light diffusion plate, a preparation method and application thereof. The preparation method of the foaming light diffusion plate comprises the following steps: mixing and melting polystyrene, a polymer containing carbonyl and a nucleating agent to obtain a blend, wherein the melting temperature of the polymer containing carbonyl is smaller than or equal to 200 DEG C; and injecting supercritical carbon dioxide into the blend, and then extruding and foaming to obtain the foaming light diffusion plate. According to the invention, the preparation method of the foaming light diffusion plate is clean and harmless, the mass of the light diffusion plate can be effectively reduced, and the prepared foaming light diffusion plate is uniform in cell size, uniform in density, good in optical performance and mechanical performance, capable of passing an IK03 protection grade test and wide in application prospect.

The invention relates to a 2, 5-furan diformyl copolyester foam material and a preparation method thereof. The preparation method comprises the steps of (a) putting 2,5-furan diformyl copolyester plastic into a mold, pressing into a laminated preform, and quenching the laminated preform; (b) putting the quenched preform and a first foaming agent into a sealed container without contacting, whereinthe first foaming agent is at least one of chloroform, acetone, diethyl ether, pentane and hexafluoroisopropanol; (c) feeding a second foaming agent into the sealed container, wherein the second foaming agent is at least one of carbon dioxide and nitrogen; keeping the temperature in the sealed container to be 40 DEG C to 65 DEG C, enabling the first foaming agent to change into a gas state from aliquid state, and keeping the pressure in the sealed container to be 2MPa to 5MPa, wherein the pressure keeping time is 5h to 10h; (d) releasing a gas in the sealed container, taking the preform out,putting into a foaming medium for foaming, and cooling to obtaining the 2,5-furan diformyl copolyester foam material with the cell size being 5 microns to 50 microns and the expansion rate being 2 times to 15 times.