33results about How to "Controllable expansion ratio" patented technology

The invention provides a foaming synthetic leather manufacturing technology based on waterborne polyurethane (WPU). In the manufacturing technology, the WPU is taken as a main raw material, and a hollow microsphere foaming agent is taken as a foaming material; and the technology can be widely used for manufacturing synthetic leathers such as clothing leathers, luggage leathers, shoe upper leathers, sofa leathers, home interior trim leathers and the like. The content of volatile organic compounds (VOC) in the finished leather is lower than 2mg/kg (leather), and the air permeability and moisture penetrability are good, thus meeting the EU (European Union) requirements for the ecological synthetic leather; and in addition, the foaming synthetic leather has the advantages of moderate foaming multiplying power, uniform and compact foaming holes, bulky and firm hand feel as well as good comprehensive performance which is equivalent to or superior to that of a solvent-borne product. The foaming synthetic leather manufacturing technology based on the WPU provided by the invention has the beneficial effects that by adopting the WPU instead of the traditional solvent-borne PU, organic pollution is eliminated from a source, organic solvent resources are saved, the comprehensive energy consumption is lowered, the employment environment of laborers is improved, and the ecological grade of the synthetic leather and the international market competitiveness of the product are enhanced, thus achieving obvious innovativeness and remarkable social and economic benefits.

The invention provides an inorganic filler modified polyurethane foam material and a preparation method thereof, and belongs to the field of macromolecular foam materials. The inorganic filler modified polyurethane foam material is prepared from polyhydric alcohols, deionized water, catalysts, surface active agents, inorganic particles and isocyanate compounds. The preparation method comprises thefollowing steps that 1, polyhydric alcohols and isocyanate are preheated separately; 2, polyhydric alcohols, deionized water, catalysts, surface active agents and inorganic particles are mixed proportionally to be uniform; 3, the mixture is stirred with isocyanate compounds at high speed; 4, free foaming is performed, and the inorganic filler modified polyurethane foam material is obtained. The inorganic filler modified polyurethane foam material adopts deionized water as the foaming agent, is environmentally friendly, due to the high opening rate of polyurethane foams, a channel can be provided for sewage flowing, the adhesion property of microorganisms can be improved due to biocompatibility of filler, and the material has the advantages that the method is simple, the cost is low and the requirement for equipment is low.

The invention discloses double-component pouring silica gel. The double-component pouring silica gel comprises a component A and a component B. The component A comprises, by weight, 100 parts of vinyl silicone oil, 0-100 parts of non-reactive silicone oil, 0.05-10 parts of hollow micro-powder, 0.01-1.5 parts of transition metal complex catalysts and 0-3 parts of white paste; the component B comprises, by weight, 100 parts of vinyl silicone oil, 0-100 parts of non-reactive silicone oil, 0.05-10 parts of hollow micro-powder, 0.01-1 part of alkynol inhibitors, 10-40 parts of hydrogen-containing silicone oil and 0-3 parts of black paste. The double-component pouring silica gel has the advantages that the hollow micro-powder is used as a pre-foam filler, so that stable foam is available in the component A and the component B before the double-component pouring silica gel is used, and the double-component pouring silica gel is low in density and small in pore diameter, and foam holes are uniform; the double-component pouring silica gel is used as a pore closing material and is excellent in impact resistance, rebounding performance, softness, sound insulation, waterproof performance and steam-proof performance, and the like.

The invention discloses a preparation method of foamed polypropylene beads. The method comprises the following steps that 1, polypropylene resin, an active filler and auxiliaries are added into a high-speed mixing machine and mixed to be uniform at the temperature of 10-20 DEG C, and a polypropylene foaming material is obtained; 2, the polypropylene foaming material is added into a triple-screw extruder, plastification and mixing are conducted, a supercritical fluid is injected, the mouth mold pressure is controlled to be 5-25 MPa, the mouth mold temperature is 110-160 DEG C, instant pressure release is conducted through a mouth mold, foaming is conducted, and super-fine hole foamed polypropylene is obtained; 3, super-fine hole foamed polypropylene is subjected to mold surface water-ring hot-cutting granulation, drying and sieving, and the foamed polypropylene beads are obtained. The method is low in production cost, high in capacity, safe and environmentally friendly, no foaming agent decomposed residue exists in the prepared foamed polypropylene beads, secondary foaming can be conducted, the foaming ratio can be adjusted, the rebound resilience of a finished product is high, decomposing and recycling are easy, and the foamed polypropylene beads can be widely used in the fields of plastic packaging, transportation industry, military aerospace, office supplies and the like.

The invention relates to an expanded graphite material, and discloses expanded graphite and a preparation method thereof. The traditional high-temperature expansion method is combined with a graphite expansion furnace; the optimal expansion temperature is used; the product stability can be effectively improved through controlling the raw materials and the process parameters at the expansion temperature, so that the large-scale preparation of stable expanded graphite with controllable expansion times is realized; the expansion times is 200 to 300; the bore diameter is 30 to 100nm; the carbon content is stable. The temperature region is formed by defining the temperature of a feeding opening and a discharging opening; the expansion time is controlled by setting the feeding speed and the wind speed; then, the separation and collection are realized through wind speed; the large-scale preparation is realized; the inert gas protection is not needed; the graphite high-temperature oxidation caused by too high expansion temperature can be prevented, so that the expansion volume of the graphite is reduced.

The invention relates to the technical field of polyurethane, in particular to a high-flame-retardancy polyurethane gas hole sealing material for a coal mine and a preparation method of the high-flame-retardancy polyurethane gas hole sealing material. The hole sealing material is prepared from a component A and a component B, wherein the component A comprises polyhydric alcohol, water, an adjuvant, a flame retardant and a physical foaming agent; the component B is polymethylene polyphenyl isocyanate. Due to the formula design, a high-flame-retardancy polyurethane material which is high in flame retardancy, stable in effect and applied to gas hole sealing is obtained by compounding the polyhydric alcohol, the adjuvant and the flame retardant, and has the advantages of normal temperature reaction, adjustable reaction speed, adjustable foaming rate and high flame retardancy; foam produced by the high-flame-retardancy polyurethane material is high in flame retardancy, high in bonding strength to a coal and rock mass, high in shear strength and toughness after being bonded and impact-resistant; relevant raw materials are low in odor and cannot generate any toxic gas, and the use and environmental protection requirements of the gas hole sealing material can be completely met.

The invention discloses a foaming method of polypropylene foamed microparticles. The foaming method comprises the following steps: uniformly mixing polypropylene raw material particles with a first auxiliary agent, and extruding and granulating the mixture to obtain the polypropylene microparticles for foaming; adding the microparticles, a second auxiliary agent and water into a high pressure kettle to be stirred, heating the kettle by steam, injecting high pressure carbon dioxide into the polypropylene microparticles which are softened but not melted; keeping the temperature and the pressurefor a certain time to make sure that high pressure carbon dioxide fully impregnates the polypropylene microparticles, wherein the polypropylene microparticles are foamed; and after foaming, relievingthe pressure quickly to discharge to obtain the polypropylene foamed microparticles. The foaming method of the polypropylene foamed microparticles achieves continuous production and operation, and ishigh in efficiency, simple in process and suitable for industrial popularization and application. The foaming rate of the polypropylene foamed microparticles prepared by the invention is adjustable, the pores are uniform and fine, and the polypropylene foamed microparticles are excellent in mechanical property and has good compressive strength, tensile strength and buffer performance.

The invention discloses an impact-resistant polypropylene foaming material with high-melt strength. According to the invention, impact-resistant polypropylene with high-melt strength taken as matrix resin is obtained by foaming, The impact-resistant polypropylene with high-melt strength comprises a propylene homopolymer component and an ethylene/1-butylene copolymer component; wherein the propylene homopolymer component comprises at least a first propylene homopolymer and a second propylene homopolymer; the ethylene content in the ethylene/1-butylene copolymer is 20-45 wt%; the weight ratio of the ethylene/1-butylene copolymer component to the propylene homopolymer component is 11-80: 100; and the ratio of room-temperature trichlorobenzene soluble Mw of the material to room-temperature trichlorobenzene insoluble Mw of the material is greater than 0.5 and is smaller than or equal to 1. The invention also relates to a preparation method of the foaming material. The foaming material has the characteristics of good shock resistance at high and low temperature, high physical heat resistance, high closed porosity, good insulation and sound insulation performances, controllable foaming multiplying power and foam structure, and easy recovery and utilization.

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 discloses an expandable silicone rubber sheet and a preparation method thereof. The expandable silicone rubber sheet is prepared from the following components in parts by weight: 100 parts of silicone rubber, 10 to 30 parts of white carbon black, 100 to 150 parts of filler, 3 to 5 parts of vulcanizing agent, 6 to 10 parts of foaming agent and 3 to 8 parts of hydrogenated silicone oil. The preparation method of the expandable silicone rubber sheet comprises the following steps: putting and mixing the silicone rubber and the white carbon black in proportion in an open mill, then sequentially adding the filler, the vulcanizing agent, the foaming agent and the hydrogenated silicone oil, and mixing, thus preparing the expandable silicone rubber sheet. The expandable silicone rubber sheet disclosed by the invention can be used as a filling material for filling a gap of a structural member, and the gap of the structural member can be spontaneously filled during a temperature rising process through foaming; compared with a foamed silicone rubber filling material prepared by a traditional method, the preparation method has the advantages that advanced foaming is not required,the expandable silicone rubber sheet and the structural member are integrally formed, filling is compact, the foaming is uniform, and the like.

The invention discloses a single-component polyurethane foaming adhesive as well as a preparation method and application thereof. The single-component polyurethane foaming adhesive is prepared from the following components in parts by mass: 31.1 to 55.3 parts of vegetable oil polyol, 15.0 to 53.4 parts of polyether polyol, 30 to 106 parts of polyester polyol, 100 parts of isocyanate and 0.176 to 1.570 parts of a catalyst. The single-component polyurethane foaming adhesive provided by the invention does not contain an organic solvent, has a good micro-bubble structure and cohesiveness after being cured, is simple in preparation process, adjustable in curing rate and foaming times, simple and convenient to use, and suitable for bonding of foaming ceramic tile gap base plane materials.

The invention relates to the field of composite materials, and discloses a foamable composite material composition, a foaming composite material and a preparation method and application thereof. The foaming composite material comprises a component A, a component B and a component C, the weight ratio of the component A to the component B to the component C is 1: (0.7-0.95): (0.01-0.4); the component A comprises the following components in percentage by weight: 80 to 99.5 percent of an alkaline solution, 0.3 to 10 percent of a cross-linking agent and 0.3 to 10 percent of a thermosensitive catalyst; the component B contains a polyisocyanate prepolymer and a solubilizer, the content of the polyisocyanate prepolymer is 80-99% by weight, and the content of the solubilizer is 1-20% by weight; and the component C contains a silicon-aluminum material. The foaming composite material has controllable foaming degree and excellent compressive strength, and can be applied to the fields of coal mine gas drainage hole sealing, deep hole blasting, anchoring glue and the like.