41results about How to "Small cell" patented technology

A hierarchical cell structure (HCS) cellular communications system includes a macro cell encompassing a smaller micro cell that employ the same frequency band. The macro cell includes a macro cell base station, and the micro cell includes a micro cell base station. An uplink communication cell boundary between the macro cell and the micro cell is established, and a downlink communication cell boundary between the macro cell and the micro cell is established. A radio network controller determines whether a condition exists in the HCS system which indicates that the uplink and downlink micro cell boundaries should be unbalanced. If the condition is met or exists, the power and/or antenna beam tilt of a downlink transmission from the micro cell base station is reduced to unbalance the uplink and downlink micro cell boundaries. Alternatively, the radio network controller may employ an offset value to mathematically reduce mobile detected pilot power levels associated with the micro base station.

The invention provides a method for preparing a polymer microporous foaming material by supercritical mould foaming. The method comprises the following steps of: heating a foaming mould on a mould press to the foaming temperature; placing a polymer into the mould; closing the mould by using the mould press; sealing the mould; introducing supercritical fluid, which swells and diffuses to the polymer, into the mould; and opening the mould by using the mould press to release pressure and foam to obtain the polymer microporous foaming material. Compared with the prior art, the method has the advantages that: the high-temperature and high-pressure supercritical fluid is used for swelling the polymer, so the moulding cycle is greatly shortened; the limit that only microporous foaming sheet material with lesser thickness can be manufactured in the prior art is broken through, so a polymer microporous foaming plate with greater thickness can be manufactured; when the mould is opened, the pressure-releasing speed is high and the foaming pore core-forming speed is high, so the formed microporous foaming material has smaller foaming pores, higher pore density and more excellent performance; and multiple layers of moulds can be placed on one mould press, so the method is suitable for industrialized scale production.

The invention discloses a high-temperature-resistant silicone rubber foam material and a preparation method thereof. The preparation method of the high-temperature-resistant silicone rubber foam material is characterized by comprising the following steps: mixing 100 parts of silicone rubber base stock, 20-35 parts of a reinforcing agent, 2-3 parts of a structure controlling agent, 0-0.2 part of colour master batch, 60-150 parts of a pore-forming agent and 4-5 parts of a radiation sensitizer, moulding, crosslinking through gamma ray radiation, forming pores through subsection dissolving-out, and drying, so that the silicone rubber foam material which is resistant to high temperature of 250 DEG C and still maintains excellent performance after equivalent time of 20000 hours can be obtained. The preparation method of the high-temperature-resistant silicone rubber foam material has the advantages that radiation crosslinking and dissolving-out pore forming are combined, so that crosslinking is uniform, control is easy, energy conservation and environmental protection are realized, a technology is concise, reproducibility is good, and production efficiency is high; the high-temperature-resistant silicone rubber foam material still maintains high tensile strength, high weight loss, low longitudinal deformation and low surface hardness after the equivalent time of 20000 hours at the temperature of 250 DEG C, permanent compressive deformation is slightly increased, the high-temperature-resistant silicone rubber foam material does not become brittle or hard, and the high-temperature-resistant silicone rubber foam material can serve as filling and positioning, sealing cushion, cable insulation as well as buffer and vibration-absorptive materials or parts which are used in high-temperature environment.

The invention discloses a micro-foaming polypropylene composite material and a preparation method thereof. The micro-foaming polypropylene composite material is composed of the following components by weight: 100 parts of polypropylene, 40 to 60 parts of bamboo powder, 10 to 15 parts of foaming agent, 1 to 5 parts of foaming assistant, 1 to 5 parts of antioxygen, 1 to 3 parts of nucleating agent and 5 to 10 parts of compatilizer. The micro-foaming polypropylene composite material is wide in raw material resource, low in cost, simple to operate and wide in application prospect. The micro-foaming polypropylene composite material which has small bubble holes, is even, compact, light in weight, good in impact performance and environment-friendly.

The invention relates to micropore polymethacrylimide foam with high thermal deformation temperature. The foam comprises, by mass, 35-60 parts of methacrylic acid (MAA), 65-40 parts of acrylonitrile, 0.10-4.0 parts of initiators, 1.0-20 parts of foaming agents, 1-5 parts of nucleating agents, 0.1-5 parts of cross-linking agents and 5-10 parts of heat-resisting additives; the initiators are azo-bis(4-cyano valeric acid) or mixtures of azo-bis(4-cyano valeric acid) and other azo compounds. The other azo compounds are azodiisobutyronitrile AIBN, azobisisovaleronitrile or azobisisoheptonitrile. According to the micropore polymethacrylimide foam high in thermal deformation temperature, the foam has the small pore diameter phi of 0.1-0.3 mm, thermal resistance is high, the thermal deformation temperature is high and is larger than 200 DEG C, and the mechanical property is excellent.

The invention relates to a formula of a hard polyurethane molding foam negative pressure foaming raw material, wherein the raw material is prepared by mixing polyether polyol, a polyester polyol, a foam stabilizer, a catalyst and water, and a weight ratio of the polyether polyol to the polyester polyol to the foam stabilizer to the catalyst to the water is 50-90:10-50:2-3:2-3:1-2.5. The hard polyurethane molding foam negative pressure foaming production method comprises carrying out hard polyurethane foaming under a state with a negative pressure of 0 to -0.025 MPa, wherein polyurethane foaming is performed under the negative pressure state so as to reduce polyurethane raw material requirements. In addition, a high functionality polyester polyol can be adopted as a main polyol to prepare a combination polyether so as to carry out foaming, such that a mold cavity can be filled in a short time, and the prepared foam has characteristics of thin cell, high strength and good size stability.

The invention relates to a nano composite foaming agent and a preparation method and a foamed product thereof. The foaming agent is compounded from layered montmorillonite and 4,4-oxo-bis hydrazide, wherein the mass ratio of the 4,4-oxo-bis hydrazide to the montmorillonite is 1:(4-16). The composite foaming agent is obtained by a method of recombining and compounding the layered montmorillonite with the 4,4-oxo-bis hydrazide after stripping in preparation of the foaming agent. The foaming agent has the advantages that an organic foaming agent is embedded between nanoscale montmorillonite layers, so that the foaming agent is refined, the dosage of the foaming agent is effectively controlled, a nucleating point is increased, the foaming efficiency is improved, formed bubbles are even and small in holes, and meanwhile, the property of the obtained foamed product is also improved to a certain extent by adding of an inorganic material.

The invention discloses a TPU/EVA supercritical foam composite material and a preparation method thereof. The TPU/EVA supercritical foam composite material is prepared from, by weight, 300-360 parts of a thermoplastic polyurethane elastomer, 66-73 parts of an ethylene-vinyl acetate copolymer, 25-33 parts of a maleic anhydride grafting modifier, 9-14 parts of peroxide and 1.2-1.6 parts of a nucleating agent. The TPU/EVA supercritical foam composite material has the advantages of good foaming effect, high foaming efficiency, uniform, small and dense cells, excellent mechanical properties and useproperties such as light weight and high strength, high tensile strength, large elongation at break, good mechanical properties, high tear strength, good tear resistance and low density.

The invention provides a preparation method of a polypropylene injection molding chemical micro-foamed composite material. The polypropylene micro-foamed composite material is prepared by uniformly mixing a polypropylene composite material and a foaming agent and molding an obtained mixture by adopting a secondary mold opening process, wherein the polypropylene composite material is prepared from the following materials in parts by weight: 57 to 63 parts of polypropylene, 0.1 to 25 parts of talcum powder, 0.1 to 20 parts of flexibilizer, 2 to 10 parts of dendritic macromolecule master batch, 0.2 to 0.4 part of antioxidant, 0.5 to 1 part of lubricating agent, and 0 to 3 parts of other additives, wherein the chemical foaming agent is sodium hydrogen carbonate master batch of LDPE carriers. Melt strength of the polypropylene composite system is mutually entangled and regulated with a matrix by virtue of the special dendritic structure of the dendritic macromolecule, after the foaming, a core layer presents in an obvious sandwiched structure, the diameter of a foam hole is 60 micrometers, and the foam holes are uniform and dense; and in addition, the heat insulation, sound insulation and noise reduction can be achieved, a novel solution is provided for developing the light-weight material, and the prepared polypropylene injection molding chemical micro-foamed composite material can be widely applied to products such as automotive interior door panels, instrument panels.

The invention discloses a PLA/TPU supercritical foaming composite material and a preparation method thereof. The PLA/TPU supercritical foaming composite material is prepared from the following raw materials in parts by weight: 300 to 370 parts of polylactic acid, 130 to 155 parts of polyether polyurethane, 40 to 48 parts of organic silicon modified polyurethane, 20 to 27 parts of hydroxyl siliconeoil, 14 to 18 parts of maleic anhydride grafted polyethylene, 15 to 25 parts of glass fiber, 7 to 10 parts of a nucleating agent, 6 to 8 parts of a chain extender and 5 to 8 parts of a cross-linkingagent. The PLA/TPU supercritical foaming composite material disclosed by the invention is relatively high in tensile strength and good in mechanical property; the rebound rate is high, and the reboundperformance is excellent; the density is low, the foaming ratio is high, the pore size (diameter) is moderate, pores are uniform, and the foaming effect is good; the composite material has comprehensive mechanical properties such as ultra-light weight and good elasticity; in addition, the composite material is degradable and environment-friendly.

The invention discloses a core layer material of a halogen-free flame retardant aluminum-plastic plate. The core layer material is characterized by comprising the following components by weight percent: 10-70% of resin, 20-80% of inorganic fire retardant, 0.1-5% of synergistic fire retardant, and 0.05-10% of assistant. The core layer material of the halogen-free flame retardant aluminum-plastic plate has the advantages that supercritical fluid of nitrogen or carbon dioxide is adopted as a foaming agent; the core layer material is friendly to environment, and does not generate any bad effect on the environment; meanwhile, the solubility of supercritical nitrogen or carbon dioxide in melt is better than that of a chemical foaming agent; the supercritical nitrogen or carbon dioxide can be evenly dispersed into the filled melt; evenly dispersed foams can be formed; the size of each foam is smaller than that of abscess of the chemical foaming agent; the condition that the foamed aluminum-plastic plate has better strength and better heat-insulating property is ensured.

The invention discloses a lignin-containing biodegradable polyester compound bead foaming material with a high crystallization rate and a preparation method thereof, the preparation method comprises the following steps: (1) melting and blending poly (butylene adipate terephthalate), an anhydride compound and a peroxide cross-linking agent to obtain MAH-g-PBAT particles; (2) carrying out blending granulation on the particles, degradable resin, lignin and a chain extender to obtain biodegradable polyester compound beads; and (3) putting the biodegradable polyester composite beads into a high-pressure mold, and carrying out mold pressing foaming by taking foaming gas as a foaming agent, thereby obtaining the biodegradable polyester composite beads. The MAH-g-PBAT and the chain extender can synergistically improve the compatibility of PBAT, PLA and lignin, promote chain branching and chain intertwining, successfully combine two melting points into one melting point, broaden the foaming interval, improve the foaming performance and facilitate steam forming of beads.

The invention discloses a nylon/polyurethane supercritical foamed composite material and a preparation method thereof. The nylon/polyurethane supercritical foamed composite material is prepared from the following raw materials in parts by weight: 300-350 parts of polyamide, 60-72 parts of polyurethane, 40-48 parts of a polyamide-polysiloxane segmented copolymer, 6-8 parts of graphene fiber, 5-7 parts of a cross-linking agent and 3-4 parts of a nucleating agent. The nylon/polyurethane supercritical foamed composite material disclosed by the invention is good in foaming effect and high in foaming efficiency; the foam holes are uniform, small and compact; the advantages of high resilience rate, low water absorption rate, good dimensional stability, small irreversible deformation after being pressed, high tensile strength, good mechanical properties, light weight, high strength and the like excellent mechanical properties and use properties are achieved.

The invention provides a preparation method of an anti-attenuation gasket, belonging to the technical field of sealing material preparation. The preparation method of the anti-attenuation gasket is characterized in that the anti-attenuation gasket comprises a spring steel belt and a foaming rubber layer; the foaming rubber layer is arranged on one side or two sides of the spring steel belt, and the preparation method is characterized by comprising the following steps of: carrying out surface treatment to the spring steel belt; preparing the foaming rubber; carrying out compounding, curing, checking, stamping forming and ribbing treatment on the foaming rubber and the spring steel belt sequentially so as to obtain a finished product. The foaming rubber and the spring steel belt provided bythe invention are tightly bonded, and are not easy to peel off, the product is environment-friendly, nontoxic and odorless, has a large compression amount, good rebound resilience and good flexibility, and a framework adopts the spring steel belt, so that the framework can maintain elasticity for a long time due to a honeycomb structure of the foaming rubber after being stressed, and the moment can be maintained for a long time without attenuation.

The invention relates to a special seam splicing adhesive for a double-T plate. The special seam splicing adhesive comprises the following components by weight: 150-250 parts of polypropylene oxide glycol, 100-150 parts of MDI, 20-40 parts of propane and butane, 10-20 parts of ethylene glycol dimethyl ether, 70-100 parts of superfine coal powder, 1-2 parts of simethicone, 0.5-1.5 parts of dibutyltin dilaurate, 10-20 parts of polysilsesquioxane, 10-20 parts of hollow glass micro-beads, 1-3 parts of bimorpholine, 0.1-5 parts of a foaming agent and 3 parts of tetra(beta-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid)pentaerythritol ester. The special seam splicing adhesive disclosed by the invention has the advantage of high strength.

The invention relates to a heat insulation decoration line, which belongs to a novel outer wall decoration line and component, and is suitable to be arranged on an EPS and XPS heat insulation wall body of an outer wall, so that the European, classical and elegant decoration styles can be shown; and the outer wall of a main body building can be enabled not to generate cold and heat bridge effects. For the European styles of a high-rise building, the construction period is long; cracks can occur after a long time; and the durability is poor. Therefore the heat insulation decoration line and component are used; the installation is convenient; economical performance is realized; and the durability is long. The heat insulation decoration line and component are compounded by using demolded B2 grade fireproof graphite polystyrene as a main body, sticking alkaline-resistant fiberglass gridding cloth and adding a special bonding outer protection layer. The heat insulation decoration line and component is not influenced by temperature change, achieves cold-resistant and heat-resistant effects, and cannot be influenced by humid climate and acid rain. The heat insulation decoration line can achieve the fire-proof performance, cannot give out toxic substances and is an environment-friendly high-quality product.

The present invention relates to the field of transgenic and non-transgenic plants with novel phenotypes. Provided are Solanum lycopersicum Auxin Response Factor 9 (SlARF9) proteins and nucleic acid sequences encoding these, which are useful in conferring novel phenotypes to plants, especially increased fruit size.