37results about How to "High foaming ratio" patented technology

The invention relates to a preparation method of a supercritical foaming polylactic acid material, and belongs to the technical field of foaming polylactic acid.The preparation method comprises the steps that a polycaprolactone-polylactic acid copolymer and a chain extender YMX-06 serve as modifiers to prepare modified polylactic acid granules, so that the strength and ductility of polylactic acid melt are improved, and the foaming temperature and pressure are reduced; in a supercritical state, carbon dioxide has high diffusivity and low viscosity, so that the carbon dioxide can uniformly permeate into a modified polylactic acid granule matrix to form tiny bubbles, the bubbles are not easy to collapse in a bubble growth stage, the pore size distribution uniformity is good, the sizes of the bubbles are small, and the walls are thin; compared with pure polylactic acid, the obtained modified foaming material is higher in foaming ratio, lighter, better in heat retaining property and high in mechanical strength. The ultralight, environment-friendly and foaming agent residue-free degradable foam material can be used in the fields of building insulation, cold-chain transportation, anti-collision packaging and the like.

The invention belongs to the technical field of polymer materials, and provides a nylon elastomer, a nylon elastomer foam material and a preparation method and application thereof, the intrinsic viscosity of the nylon elastomer under the conditions of 150 DEG C and 0.01 Hz is 200-50000 Pa.s; the characteristic temperature of the nylon elastomer is 120-170 DEG C, and the characteristic temperature represents the temperature at which the energy storage modulus is equal to the loss modulus of the nylon elastomer. Through the design of specific intrinsic viscosity and characteristic temperature, the nylon elastomer has excellent foamability, and a nylon elastomer foaming material prepared by foaming of the nylon elastomer is uniform in foam hole, small in foam hole diameter, stable in property, low in shrinkage rate, high in foaming ratio, high in rebound resilience and excellent in mechanical property; the comprehensive performance of the foam material is greatly improved, and the foam material has a wide application prospect.

The invention discloses a low-density flame-retardant organic silicon foam composition, a silicon rubber foam material and a preparation method of the low-density flame-retardant organic silicon foam composition and the silicon rubber foam material, and the foam composition comprises the following components in parts by weight: (A) 100 parts of organopolysiloxane; (B) 5-100 parts of a reinforcing filler; (C) 20-100 parts of a composite flame-retardant filler; (D) 1-10 parts of a structuring control agent; (E) 1-10 parts of a foaming agent; (F) 1-10 parts of an auxiliary foaming agent; (G) 1-10 parts of hydrogen-containing siloxane; (H) 0.01-3 parts of a platinum group metal compound catalyst; (I) 0.01-1 part of an inhibitor; according to the organic silicon foam composition, the component (F) and the component (E) are introduced, so that the foaming speed and the curing speed can be better matched, the organic silicon foam composition has a relatively high foaming ratio after being cured, the density of a material can be remarkably reduced, and meanwhile, foam pores of foam are uniform and fine in size.

The invention relates to the technical field of thermoplastic material foaming, in particular to a preparation method of an ultralight foaming material with micropore channels. The invention relates to an ultralight foaming material with micropore channels. The ultralight foaming material comprises the following substances in parts by weight: 80-90 parts of thermoplastic matrix resin; 0.1 to 2 parts of a pore-foaming agent; 0.1 to 0.8 part of a functional auxiliary agent; 10 to 20 parts of auxiliary materials; the pore-foaming agent comprises one or a mixture of more of activated carbon, zeolite, porous ceramic and hollow glass microspheres. According to the technical scheme, the thermoplastic matrix resin is selected to be combined with the pore-forming agent, the composite material formed after foaming treatment has a good vacuum channel structure, the density of the material is effectively reduced, the porosity of the material is improved, on the basis, selection of the pore-forming agent is optimized, and the porosity of the material is improved. The prepared ultralight foaming material has different pore structures and adsorption performance, and more excellent material performance can be obtained through mixed use.

The invention belongs to the technical field of polymer materials, and provides a thermoplastic polyurethane elastomer, a polyurethane foam material and a preparation method and application of the thermoplastic polyurethane elastomer and the polyurethane foam material. The complex viscosity of the thermoplastic polyurethane elastomer is 300-100000 Pa.s under the conditions of 160 DEG C and 0.01 Hz; the storage modulus of the thermoplastic polyurethane elastomer under the conditions of 160 DEG C and 1 Hz is recorded as G ', the loss modulus is recorded as G '', and G' / G'' is more than or equal to 0.01 and less than or equal to 100. Through the design of complex viscosity and the ratio G ' / G' of the storage modulus to the loss modulus, the polyurethane foam material has excellent foamability, and the polyurethane foam material prepared by foaming the polyurethane foam material has the advantages of high foaming ratio, small density, uniform and controllable crust thickness, uniform cell size, stable cells, low shrinkage rate and high foaming efficiency. The high-resilience foam material has high resilience and excellent mechanical properties, and fully meets the performance requirements on high-performance foam materials in the industry.

The present invention discloses a polyamide foam material and a preparation method thereof, and relates to the technical field of buffer protection, in order to solve the problem of poor resilience and compressive strength of polyamide foam materials. A polyamide composite material is subjected to a cross-linking reaction to obtain a polyamide material to be foamed, wherein the polyamide composite material includes a composite material formed by a polyethylene resin and polyamide; the polyamide material to be foamed is subjected to two-stage foaming by a supercritical foaming method to obtain a polyamide foam material. The polyamide foam material and the preparation method thereof are used to improve the resilience and compressive strength of the polyamide foam material.

The invention relates to the technical field of foaming polyurethane, and discloses a foamable polyurethane composition, a modified polyurethane and a preparation method thereof, a polyurethane foam material and a preparation method thereof, wherein the composition comprises polyurethane, polar monomer grafted polypropylene and an amino compound, and based on the total weight of the composition, the content of the polyurethane is 70-95wt%, the content of the polar monomer grafted polypropylene is 3-29.9wt%, and the content of the amino compound is 0.1-3wt%. The invention modifies the polyurethane by adopting the polar monomer grafted polypropylene and the amino compound, and the polyurethane cooperates with the polar monomer grafted polypropylene and the amino compound, so that the prepared modified polypropylene has better viscoelastic properties, thereby making the prepared polyurethane foam material have better foaming effect.

A foaming process using a carbon dioxide solution, comprising: adding a parison into a carbon dioxide solution for primary foaming, taking out, and performing secondary foaming to obtain a cellular product. A polar liquid system is used for foaming; compared with direct foaming by using a high-pressure gas, a high-foaming ratio and uniform cellular structure can be obtained more quickly, and even for a highly crystalline polymer, a good foaming effect is achieved. Controlling changes of temperature and pressure after carbon dioxide is introduced can first control the impact and penetration of carbon dioxide on the surface of the cross-linked material, and further increase of the pressure and temperature promotes increase of the solubility of carbon dioxide in the polar system, so as to promote saturation of carbon dioxide in the polymer more quickly, thereby promoting formation of a high-foaming ratio and uniform cellular structure in the subsequent heating and foaming process.

This invention provides a production process for natural latex sponges with high latex content, comprising the following steps: (1) raw material preparation and pre-vulcanization; (2) adding the pre-vulcanized latex, zinc oxide, and curing agent dispersion obtained above together into a foaming device for foaming; (3) vulcanization process; (4) washing, dehydration, and drying of the finished product. This invention's production process for natural latex sponges with high latex content allows sulfur to be evenly dispersed in the natural latex, and then, through ultrasonic waves, the sulfur can fully react with the latex, effectively shortening the latex pre-vulcanization time and increasing the foaming ratio. This not only significantly improves production efficiency and maintains the various properties of latex products, but also reduces the amount of sulfur used, and produces natural latex products with a higher latex content.

The invention provides flame-retardant polycarbonate foam and a preparation method thereof, and belongs to the field of foaming materials.The method comprises the steps that a PC raw material and an optional flame retardant are melted and mixed to obtain a PC / flame retardant blend, and the PC / flame retardant blend is processed into a PC / flame retardant blend board; the PC / flame retardant blend plate is saturated under the condition of a physical foaming agent and high temperature, the high temperature is 180-240 DEG C, the saturation pressure is 5-30 MPa, cooling is performed under a certain condition after saturation, pressure relief foaming is performed after temperature balance, and the flame-retardant polycarbonate foam is obtained. According to the preparation method, the problem of foaming difficulty caused by PC crystallization induced by plasticizing in the existing preparation is solved, meanwhile, the saturation time is shortened by utilizing the higher diffusion rate of the physical foaming agent under the high-temperature condition, and the production efficiency is improved. The method is simple in process, environmentally friendly and beneficial to large-scale production and processing; the flame-retardant PC foam material has the advantages of temperature resistance, heat insulation, high flame retardance, good mechanical property and the like.

A method of molding a sandwich panel according to an embodiment of the present invention includes a step of providing, on one or both surfaces of an (a) core material, a prepreg or the prepreg and an adhesive as a (b) skin material. The (a) core material is a super engineering plastic foam having a Tg of greater than 200°C. The (b) skin material contains: a (b-1) epoxy resin having an average molecular weight of 1300 or more or having a trishydroxymethane-type or cresol novolac-type structure and containing, in a total epoxy resin, an amount of 70 to 100 mass% of an epoxy resin that is semi-solid or solid; a (b-2) epoxy resin containing, in the total epoxy resin, an amount of 0 to 30 mass% of an epoxy resin that is liquid; and a (b-3) curing agent.

The present invention relates to the technical field of polymer foaming materials, and provides a polyamide elastomer foam material with a bimodal pore structure and a preparation method thereof. The present invention utilizes foaming gas CO2 to perform saturation treatment on a polyamide elastomer sheet solid sample, wherein the first saturation treatment is to perform a melting treatment on the polyamide elastomer to eliminate crystals; by regulating the temperature and time of the second saturation treatment, the weight crystallization degree of the polyamide elastomer is regulated to be 1.1-10%, thereby preparing a polyamide elastomer foam material with a bimodal structure having controllable pore size; since the temperature and pressure of the second saturation treatment are under the supercritical condition of CO2, the foaming temperature range is widened, and not only the polyamide elastomer foam material with a bimodal pore structure is obtained, but also the foaming ratio of the polyamide elastomer foam material is improved.

The invention relates to a grain fiber-PVC (polyvinyl chloride) composite foamed sheet with a surface co-extrusion layer and a preparation method of the grain fiber-PVC composite foamed sheet. Comprising a middle foaming layer and a surface co-extrusion layer, and the middle foaming layer and the surface co-extrusion layer both comprise PVC resin and rice hull powder. The rare earth composite stabilizer is added, so that the environment-friendly function is achieved, the rare earth stabilizer further has the coupling, reinforcing and brightening functions in the PVC material, and in addition, the rare earth composite stabilizer can further adjust the decomposition temperature of the foaming agent and achieve the effects of toughening and capacity increasing; the foaming agent is prepared by compounding an AC foaming agent and an NC foaming agent, so that the extrusion rate can be increased, meanwhile, the dimensional deviation of the product is reduced, and the surface hardness can reach about Shore D hardness 80; the weight ratio of the rare earth compound stabilizer to the foaming agent to the foaming regulator is (1-5): (0.5-1.6): (3-9). Plasticization in the processing process can be promoted, and meanwhile, the mechanical property of the material is improved.

The preparation method comprises the following steps: taking chitosan and bamboo powder, mixing, adding water, uniformly stirring, adding acetic acid while stirring, then adding a cross-linking agent, stirring at a high speed, centrifuging after high-speed stirring, removing supernate, putting the obtained turbid liquid into a container, and molding to obtain a toughening material blank; freeze-drying and crushing the toughening material blank to obtain toughening material powder; the preparation method comprises the following steps: uniformly mixing bamboo powder, starch and toughening material powder, adding a nucleating agent, invertase and an adhesive, uniformly mixing, then adding water, and stirring for 60-120 seconds to pre-expand the toughening material powder and the bamboo powder; adding a foaming agent, and stirring to form a soft bamboo powder dough; the bamboo powder, the starch, the toughening material powder, the nucleating agent, the foaming agent, the adhesive and the water are 55-65 parts by mass of the bamboo powder, 13-15 parts by mass of the starch, 5-8 parts by mass of the toughening material powder, 0.2-0.4 part by mass of the nucleating agent, 2-4 parts by mass of the foaming agent, 1-2 parts by mass of the adhesive and 15-20 parts by mass of the water; and carrying out hot press molding on the bamboo powder dough at 210-220 DEG C to obtain the bamboo powder.

The invention discloses full-biodegradable foamed plastic and a preparation method thereof, and belongs to the technical field of foaming materials, and the full-biodegradable foamed plastic is prepared from the following raw materials in parts by mass: 100 parts of polylactic acid, 0.1-0.5 part of an initiator, 0.5-3 parts of a chain extender, 0.1-0.3 part of an antioxidant, 0.5-2 parts of a plasticizer, 8-10 parts of an additive and 1-4 parts of a nucleating agent. The preparation method comprises the following steps: preparing long-chain branch PLA with low gel content through an initiator and a chain extender, then increasing nucleation sites by adopting a micron-sized nucleating agent, and preparing the fully biodegradable PLA foamed plastic through a supercritical fluid foaming process of heating and cooling. The full-biodegradable foamed plastic disclosed by the invention is good in foam pore morphology, small in foam pore size and uniform in foam pore distribution, and the foam pore density is remarkably improved; the gel is low in content, degradable and environment-friendly; the compression performance is excellent.

The application provides a polyolefin foamed bead and a preparation method and a foamed product thereof, and belongs to the technical field of foamed materials. The preparation method of the polyolefin foamed bead comprises the following steps: mixing polyethylene, an alpha-olefin elastomer and a crosslinking agent, and then adding the mixture into an open mill to perform melt extrusion and granulation, so as to obtain a polyolefin composite; mixing the polyolefin composite with polypropylene, adding a supercritical fluid in a plasticizing stage of a first-order extruder, and adopting a cooling process in a second-order extruder, so as to obtain the polyolefin foamed bead. The polyolefin foamed bead has low forming pressure, high heat resistance and high foaming ratio.

The utility model relates to colloid foam generating equipment, and discloses a foam generating device, a gel foam generating device and a gel foam fire rescue device.The foam generating device comprises the foam generating device, and the foam generating device comprises a first mixer, a second mixer and a primary expander which are sequentially connected; a foaming liquid channel and a compressed gas channel of the first mixer are both communicated with a turbulent flow cavity of the second mixer, so that foaming liquid and compressed gas are mixed to form gas-liquid mixed fluid, and the turbulent flow cavity is communicated with a primary expansion cavity of the primary expander; the cross sectional area of the turbulent flow cavity is smaller than that of the primary expansion cavity, and a foaming assembly used for foaming the gas-liquid mixed fluid is arranged in the primary expansion cavity. According to the foam generation device, the gel foam generation device and the gel foam fire rescue device, gel foam has high foaming times.

The invention belongs to the technical field of plastic packaging materials, and particularly relates to a composition for polyethylene foamed beads as well as a preparation method and application of the composition. Two kinds of polyethylene A and B produced by adopting a metallocene catalyst are adopted, 0.05-0.3 part of an antioxidant and 0.05-0.5 part of other auxiliaries are added to prepare polyethylene composition particles, the polyethylene foamed beads are prepared through a kettle type dipping foaming method, the obtained foamed beads are uniform in size, good in roundness and good in foamability, and the foaming performance is good. The material has the characteristics of good flexibility, high tensile strength, high elongation at break and the like, and can be applied to the fields of buffer parts, packaging container interior materials, low-temperature packaging and the like.

The present application provides a polymer lightweight concrete foaming agent and a preparation method thereof, comprising 4-8 parts of vegetable protein, 3-8 parts of hydroxypropyl methylcellulose, 3-15 parts of a foam stabilizer, 10-40 parts of a polymer bonding component, 5-10 parts of a cellulose solution, and 5-12 parts of a salt component; the concrete foaming agent further comprises: an anionic surfactant, a cationic surfactant, and a nonionic surfactant; the anionic surfactant is sodium dodecylbenzene sulfonate and sodium methylene dinaphthalene sulfonate in a mass ratio of 1:1.2-1.5; the nonionic surfactant is selected from alkylphenol polyoxyethylene ether and polyethylene glycol octylphenyl ether in a mass ratio of 1:1.01-1.24; the cationic surfactant is selected from cationic guar gum and hexadecyltrimethylammonium bromide in a mass ratio of 1:0.6-0.9; the added amounts of the anionic surfactant, the cationic surfactant, and the nonionic surfactant account for X, Y, and Z of the total weight of the foaming agent, and satisfy the relationship: Y+Z≥0.8X, Z≥1.2Y. The foaming agent of the present application has excellent comprehensive properties such as low water absorption.

The present invention provides a process based on supercritical fluid foaming and hot pressing shaping, comprising the following steps: S1, adding all raw materials to a banbury mixer for mixing, and single-screw granulation to obtain composite material particles; S2, using an injection molding machine to inject and vulcanize the composite material particles to obtain a midsole embryo; S3, placing the midsole embryo in an autoclave for infiltration; S4, placing the infiltrated embryo in an oven for heating and foaming to obtain a semi-finished midsole; S5, placing the semi-finished midsole in a mold for hot pressing and shaping, and then cooling with water for 550 to 650 seconds to obtain a finished product. The present invention is simple to operate, and uses specific raw materials, proportions and processes. The obtained finished product not only has a high rebound rate and good compression permanent deformation performance, but also has excellent wear resistance and moderate hardness, and is very suitable for preparing midsole materials.

The invention discloses a polyamide foam material as well as a preparation method and application thereof. The polyamide foam material comprises the following raw material components in parts by weight: 85-98 parts of polyamide 5X resin and 0.5-5 parts of a chain extender, the pore size distribution of the foam material is 1.0 to 3.0. According to the invention, polyamide 5X resin is used as a raw material, a polyamide modified material meeting foaming requirements is prepared through chain extension modification, and then the bio-based polyamide foam material is prepared through continuous extrusion, foaming and molding by twin-screw extrusion foaming equipment. Or the polyamide 5X resin is subjected to online chain extension modification and continuous extrusion foaming molding in double-screw extrusion foaming equipment to prepare the bio-based polyamide foam material, and the bio-based polyamide foam material has the characteristics of low foam density, high foaming ratio, high compression strength, uniform average cell diameter and small pore size distribution.

The invention provides a three-connection foam generator for fire fighting, and relates to the technical field of fire fighting equipment, the three-connection foam generator comprises a main channel, one end of the main channel is provided with connectors along a horizontal line, each connector is provided with a spiral jet device, and the periphery of the spiral jet device far away from the connector end is installed on a foam barrel; a metal fine screen is mounted in each foam barrel, supporting arms are rotationally connected to the outer sides of the foam barrels on the two sides, and the supporting arms extend towards the ends, away from the spiral jet device, of the foam barrels and are provided with guide covers; aiming at the particularity of petrochemical fire disasters and the situation that the coverage area of a foam gun of a traditional high-pressure spraying fire fighting truck at the present stage cannot meet the requirement of an independent working face, foam coverage is carried out on the storage tank fire disasters by changing the types of spraying devices and the foam generation mode and installing a detachable three-connection foam gun barrel on a boom (high-pressure spraying fire fighting truck); the device is large in flow, wide in foam covering area and detachable, and overcomes the defects of a traditional high-pressure spraying vehicle at present.

The utility model provides a kind of HNSPS low energy consumption external wall external thermal insulation system, it is related to external wall thermal insulation technical field, including base wall, adhesive layer, thermal insulation layer and protective layer;Base wall includes concrete wall or masonry wall;Adhesive layer includes bonding mortar and anchor bolt, bonding mortar is located base wall outside;Thermal insulation layer is HNSPS insulation board, thermal insulation layer is located between adhesive layer and the protective layer of outermost layer.The utility model has the beneficial effects of: reasonable in design, simple structure, safe and reliable, improve the fire performance of system, reduce the fire occurrence in the use process of the product.

The invention discloses a modified toluene diisocynate composition as well as a preparation method and application thereof. The modified toluene diisocynate composition comprises 9-20 wt% of a compound containing a carbamate group, 20-25 wt% of a compound containing a biuret group and 25-30 wt% of a compound containing a triuret group and a polyuret group. The content of isocyanate groups in the modified toluene diisocynate composition is 29.0-33.0%, and the modified toluene diisocynate composition has the viscosity of 500-15000mPa. S at the temperature of 25 DEG C, can replace PMDI and is applied to the field of high-resilience polyurethane foaming.

The invention discloses flame-retardant polypropylene foamed plastic and a preparation method thereof, and relates to the technical field of thermal insulation materials. The preparation method of the flame-retardant polypropylene foamed plastic comprises the following steps: adding polypropylene and a functional additive into a charging barrel of an extruder according to the raw material ratio, and carrying out melt blending, extrusion and granulation to obtain microparticles; the microparticles, deionized water and a dispersing agent are added into a high-pressure reaction kettle, a physical foaming agent is introduced, heat preservation and pressure maintaining treatment is conducted, pressure relief, cooling and drying are conducted, and foamed beads are obtained; the foamed beads are subjected to water vapor molding and annealing shaping, and the flame-retardant polypropylene foamed plastic is obtained. The polypropylene foamed plastic prepared by the invention has the characteristics of flame retardance and excellent mechanical properties.

The utility model discloses a pressurizing type foam generator structure which comprises an air pump, an air pipe, an air inlet, a foam liquid storage cavity, a pressurizing cavity and a foam nozzle. The air inlet is formed in and communicated with the bottom of the foam liquid storage cavity; an output port of the air pump is connected to the air inlet through the pipeline; the top of the foam liquid storage cavity is communicated with the pressurizing cavity to form an integral space; and the foam nozzle is connected and communicated with the pressurizing cavity. Under the condition that the same amount of foam is jetted, the consumption of consumed foam liquid consumables is lower, the water content of the jetted foam is lower, the foam expansion is high, and meanwhile, the foam jetting device has the advantages of being simple in overall structure, low in production cost, small and exquisite in size, low in failure rate and the like.

The invention discloses a sodium bicarbonate microcapsule foaming agent and a preparation method thereof. The preparation method comprises the following steps: mixing polyvinyl alcohol with deionized water, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol aqueous solution; the preparation method comprises the following steps: adding NaHCO3 into a polyvinyl alcohol aqueous solution according to a mass ratio of polyvinyl alcohol to sodium bicarbonate of 1: (1.5-6), stirring and dissolving to obtain a mixed solution of sodium bicarbonate and polyvinyl alcohol; and pumping the mixed solution of sodium bicarbonate and polyvinyl alcohol into a spray dryer for spray drying to obtain the polyvinyl alcohol coated NaHCO3 microcapsule. According to the invention, the initial decomposition temperature of the sodium bicarbonate foaming agent is increased, the decomposition temperature interval is reduced, the dispersity and compatibility are improved, the production process is simplified, the sodium bicarbonate microcapsules and AC are synergistically used in the foaming process, and the overall performance of the foaming material is also improved, so that the foaming material has excellent performance in the aspects of low hardness, high elasticity, soft texture, uniform foam holes and the like.

The application relates to the field of high polymer foaming materials, and particularly discloses a preparation method of elastic polypropylene composite foaming beads, the foaming beads and a molded product thereof, and the preparation method of the elastic polypropylene composite foaming beads comprises the following steps: uniformly mixing polypropylene resin, alpha-olefin elastomer and an additive, melt plasticizing, the ratio of the melt mass flow rate of the polypropylene resin to that of the alpha-olefin elastomer being 1:1-3, to obtain a composite; injecting a supercritical fluid, the supercritical fluid accounting for 0.5-3.0 wt% of the total mass of the composite, mixing and melting to obtain a mixed melt; gradiently cooling the mixed melt, then extruding, cutting and drying, then adding a dispersion medium and a foaming agent, impregnating through pressurization and heating, then releasing pressure to foam, washing, drying and curing, to obtain the foaming beads; the molded product is obtained by water vapor heating molding of the foaming beads; and the foaming beads have the advantages of good compatibility and dispersibility, good heat resistance, high expansion ratio, high elasticity and dimensional stability.

The invention provides a high-flame-retardant high-foaming-ratio cross-linked polyolefin foaming material and a preparation method thereof, and relates to the technical field of high polymer materials. Polyolefin, a foaming agent, an auxiliary foaming agent, an activating agent of the foaming agent, a cross-linking agent, a cross-linking accelerant, a flame retardant, a lubricating agent and inorganic filler are subjected to banburying, extrusion, calendaring, foaming, edge cutting and rolling according to certain mass parts, the production process is simple, the dosage of the flame retardant is small, the production cost is effectively reduced, and the production efficiency is improved. The chemical crosslinking polyolefin foaming material is high in foaming ratio and good in flame retardant property.