41results about How to "Excellent compression recovery performance" patented technology

A polylactic acid foam obtained from a resin composition comprising polylactic acid (A), a polyolefin resin (B), and a polyolefin resin copolymer (C), characterized in that the ratio of the weight of the polylactic acid (A) to the total weight of the polyolefin resin (B) and the polyolefin resin copolymer (C), (A) / {(B)+(C, in the resin composition is 0.2-6. The polylactic acid foam is a foam made from a polylactic acid resin, which burdens the environment little, and excellent in heat resistance, moldability, and compression recovery. This polylactic acid foam is suitable for use in various applications where polyolefin resin foams are used at present, such as automotive applications, bases for heat insulators, cushioning materials, packing materials, pressure-sensitive adhesive tapes, etc., and joint filling materials.

The invention relates to the field of functional materials. In order to solve the deficiencies and defects of the traditional infrared fire alarms and smoke alarms in the using process at present, theinvention provides a novel resistance type fire detection / early-warning sensor, which is formed by connecting a low-voltage power supply, a warning lamp, a fire early-warning composite material and aplurality of lead wires in sequence, wherein the fire early-warning composite material is prepared from, by weight, 25-45 parts of melamine foam, 8-40 parts of graphene oxide and 15-67 parts of silicon-containing additive. The process is simple and efficient, and the raw material is low in cost. The invention further provides an application of the resistance type fire detection / early-warning sensor. The resistance type fire detection / early-warning sensor is used for monitoring and preventing various types of combustible materials in a high fire risk region, reducing or even avoiding the occurrence of fires and loss caused by the fires.

The invention discloses a tunnel portal dangerous rock falling multi-stage protection method and a structure body thereof. The tunnel portal dangerous rock falling multi-stage protection method concretely comprises the following steps: step I, when rockfall impact energy is small, a high-strength rigid ceiling guides falling rocks to the two sides of a traffic line; step II, when the rockfall impact energy is medium, the high-strength rigid ceiling transfers the impact energy to a shock absorption and energy dissipation device and guides the falling rocks to the two sides of the traffic line at the same time; and step III, when the rockfall impact energy is large, the high-strength rigid ceiling carries out light plastic deformation and transfers the energy to the shock absorption and energy dissipation device at the same time, and the shock absorption and energy dissipation device carries out compressive deformation to realize the protection action. The structure body of the tunnel portal dangerous rock falling multi-stage protection method comprises the high-strength rigid ceiling, the shock absorption and energy dissipation device, a supporting structure and a permanent anchoring base. The tunnel portal dangerous rock falling multi-stage protection method and the structure body thereof realize multi-stage protection in a mode with the synergistic effect of avoidance, energy dissipation and guide and have the characteristics of obvious flexibility, applicability, economy and environmental protection property.

The invention discloses a thermoplastic elastomer foamed door seal strip and a preparation method thereof. The thermoplastic elastomer foamed door seal strip is characterized by being prepared from the following materials for preparation in parts by weight: 60 to 110 parts of styrene elastomer, 10 to 30 parts of high-density polyethylene, 10 to 40 parts of polypropylene, 60 to 110 parts of filling oil, 30 to 80 parts of mineral filler, 1 to 5 parts of lubricant, 1 to 5 parts of coupling agent, 0.1 to 2 parts of antioxidant, 0 to 5 parts of crosslinking agent and 1 to 8 parts of foaming agent. The preparation method is as follows: the styrene elastomer and the filling oil among the materials according to parts by weight are first sufficiently mixed for absorption, the other components are then added and uniformly mixed, the uniformly mixed materials are extruded by a double-screw extruder for pelletization, and the pelletized material is sent into a single-screw extruder and extruded out to be shaped. According to the preparation method, in the process of production, no wastewater and waste gas are produced, no solvents are discharged, halogen is not contained, scraps can be recycled, and a product has the advantages of good elasticity, high strength, good compressive resilience, low specific gravity, adjustable density, smooth surface and good welding effect.

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.

A press felt for papermaking comprises a base body, a fibrous assembly, and a three-dimensional knitted fabric within the interior of the felt. The base body and the knitted fabric may be in contact, or, for improved adhesion between the base body and the knitted fabric, a fibrous assembly may be disposed between the base body and the knitted fabric. Excellent compression recoverability and sustainability may be obtained.

An elastic knitted fabric having a multilayer structure, made by binding separate front and back two-layer ground knitted fabrics together, wherein the above described two-layer ground knitted fabrics are bound together with only a bare string(s) of polyurethane based elastic fibers of 17 to 3000 decitexes. <IMAGE>

The invention discloses an EPDM / natural rubber combined ageing-resistant rubber and a preparation method thereof. The method comprises the following steps: (1) preparing EPDM masterbatch; (2) preparing natural masterbatch; (3) mixing EPDM / natural rubber; and (4) vulcanizing the rubber compound and a vulcanizing agent for 20-60min in a vulcanizing machine in order to form to obtain the ageing-resistant rubber. According to the method, a supercritical carbon dioxide technology is carried out, the PEDM / natural rubber mixed rubber is subjected to supercritical treatment before vulcanizing, so that the compatibility and the co-vulcanization performance of the two-phase rubbers can be extremely improved, and the vulcanizing rate of the rubber compound is effectively increased; and the obtained rubber realizes the effective combination of the outstanding performances of the EPDM / natural rubber; the prepared rubber is outstanding in ageing resistance and mechanical performance and meets the performance demand of various special environments to a sealing material.

The invention discloses a preparation method of MXene-based composite aerogel. The preparation method comprises the following steps: adding MXene into deionized water, and carrying out ultrasonic treatment and stirring to obtain MXene dispersion liquid; adding functionalized nano cellulose crystals into the MXene dispersion liquid, performing stirring, carrying out molecular self-assembly, adding polyurethane, continuously stirring and carrying out chemical crosslinking; and after the reaction is finished, carrying out liquid nitrogen freezing and ice crystal volatilization to obtain the MXene-based composite aerogel. The preparation method is characterized by taking the functionalized nano cellulose crystals as an assembling agent and a template, carrying out phase separation and self-assembly on the functionalized nano cellulose crystals and MXene two-dimensional nanosheets, then carrying out chemical crosslinking reaction with waterborne polyurethane, and then carrying out directional freeze-drying operation to obtain the MXene-based composite aerogel material with a three-dimensional directional internal pore channel structure. The MXene-based composite aerogel material not only has a super-elastic mechanical property, but also has an excellent electrochemical property.

A press felt for papermaking comprises a base body, a fibrous assembly, and a three-dimensional knitted fabric layer comprising two pieces of fabric connected by connecting fibers. The three-dimensional knitted fabric layer is disposed within the press felt at a distance from both the wet paper web contact surface and the machine contact surface of the felt. At least some of the connecting fibers are diagonal fibers.

The invention discloses a three-dimensional carbon-rich nanofiber ceramic aerogel and a preparation method thereof, and the preparation method is based on a far electric field-electrostatic spinning preparation method, and the method specifically comprises the following steps: after highly polymerized zirconium acetylacetonate powder is combined with a phase stabilizer yttrium element, introducing a silane coupling agent KH550 at the same time; co-dissolving macromolecular polyoxyethylene PEO in methanol to prepare a binary silicon-zirconium ceramic electrostatic spinning precursor with high spinnability, and then preparing and forming a binary silicon-zirconium nanofiber ceramic aerogel precursor with a three-dimensional layered structure through a far electric field-electrostatic spinning method; and finally, carrying out step-by-step high-temperature annealing crystallization heat treatment and chemical crosslinking to obtain the three-dimensional carbon-rich nanofiber ceramic aerogel with an intact shape structure. The preparation method provided by the invention has the advantages of low production cost and simple production process, and the prepared three-dimensional carbon-rich nanofiber ceramic aerogel material has high carbon content and excellent high-temperature heat insulation performance and mechanical performance.

The invention provides an electric telescopic fender which comprises an electric telescopic shaft, an anti-abrasion layer, a reinforcing layer and a rubber foaming layer. The electric telescopic shaft, the reinforcing layer and the anti-abrasion layer are sequentially and coaxially arranged in a packaged manner from inside to outside. The portion between the reinforcing layer and the electric telescopic shaft is filled with a rubber foaming material, so that the rubber foaming layer is formed. Flange plates are installed at the two ends of the electric telescopic shaft. Compared with the prior art, the quay fender has the beneficial effects of being long in service life, large in compression distance, large in energy absorption capacity and the like.

The invention belongs to the technical field of cables, and relates to a photoelectric composite cable with a special-shaped filling material. The cable comprises a reinforcing part, a plurality of power transmission conductors which are located at an outer side of the reinforcing part and sequentially tangential or slightly separated, optical fiber communication units located in gaps outside the adjacent power transmission conductors, a protection layer wrapping the power transmission conductors and the optical fiber communication units, and a sheath layer which covers the protection layer in an extruding manner. The cable is characterized in that the gaps outside the adjacent power transmission conductors are provided with special-shaped ropes; the special-shaped ropes are formed by the sequential jointing or one-time extrusion molding of a plurality of small-structure filling rope bodies; the outer edges of the small-structure filling rope bodies are respectively a complete cylindrical surface; the power transmission conductors respectively consists of a conductor and an insulating body; and the optical fiber communication units respectively consists of an optical fiber and a protection tube wrapping the optical fiber. The special-shaped ropes are made of materials with a special formula. The cable provided by the invention is simple in structure, is lower in cost, is better in performance, and is more convenient in construction.

The invention belongs to the technical field of cables, and in particular relates to a photoelectric comprehensive cable with irregular filling ropes. The photoelectric comprehensive cable comprises a reinforcing part, a plurality of transmission conductors which are arranged at the outer side of the reinforcing part and are sequentially tangential to each other or arranged at small intervals, optical fiber communication units positioned in outer gaps between the adjacent transmission conductors, protecting layers for wrapping the transmission conductors and the optical fiber communication units, and protecting cover layers which wrap the protecting layers by extrusion molding. The photoelectric comprehensive cable is characterized in that the irregular filling ropes are arranged in the outer gaps between the adjacent transmission conductors; each optical fiber communication unit is clamped into the corresponding irregular filling rope. According to the photoelectric comprehensive cable with the irregular filling ropes, the irregular filling ropes are manufactured from special material; the photoelectric comprehensive cable has the beneficial technical effects of being simple in structure, low in cost, outstanding in performance, convenient to construct and the like.

The invention discloses a preparation method of polypyrrole-graphene-polyvinyl alcohol composite aerogel. The preparation method comprises the following steps: (1) dispersing graphene oxide into a dispersing agent, to obtain graphene oxide dispersed liquid with a certain concentration; (2) adding pyrrole, a glutaraldehyde solution and a polyvinyl alcohol solution into the graphene oxide dispersed liquid obtained in the step (1) in sequence, uniformly stirring the components, and allowing the uniform mixture to stand still for a period of time; (3) cyclically freezing and defreezing a composite obtained in the step (2) at low temperature and normal temperature for multiple times, to obtain pyrrole-graphene oxide-polyvinyl alcohol composite aerogel; (4) putting the composite aerogel obtained in step (3) into an oxidant and hydrazine hydrate in sequence, to obtain the polypyrrole-graphene-polyvinyl alcohol composite aerogel. The preparation process of the preparation method is simple; the obtained composite aerogel is extremely high in electrochemical performance and compression resilience, and can be used for producing novel electronic devices such as a compressible supercapacitor.

The invention relates to a powerful three-dimensional curly memory fiber and a manufacturing method thereof. Raw materials include: poly(1,4-cyclohexanedimethanol terephthalate) referred to as PCT; propylene glycol terephthalate referred to as PTT; blended and spun through melting and kneading. The invention uses the homogeneously dispersed and stable blend melt formed by melting and blending of polymers to carry out spinning, drawing and other processes to obtain three-dimensional short fibers with excellent curling and memory properties. On the one hand, it is because PCT itself has very good curling and compression recovery properties. In addition, under the synergistic effect of PTT’s high elastic properties, PCT is easier to form multiple and dense curls, and PTT also has excellent memory properties, which can lock Holds the formed curl and always maintains the original curl state.

The invention discloses a polyaniline / graphene / polyvinyl alcohol composite gel. First, graphene oxide and p-phenylenediamine are dispersed and reacted to obtain aniline-containing graphene; aniline and aniline-containing graphene are subjected to water Thermal reaction to obtain polyaniline / graphene composite gel, which is then immersed in polyvinyl alcohol solution for cyclic freezing and thawing treatment. The present invention uses aniline as a reducing agent and a polymerization monomer at the same time, uses aniline to reduce graphene oxide in a hydrothermal reaction, and initiates the polymerization of aniline through the aniline group grafted on the graphene, and realizes the molecular level of polyaniline and graphene. Composite, and further use the hydrogen bond interaction between polyvinyl alcohol and polyaniline to enhance the mechanical properties of the resulting gel, so that the composite gel has good compression recovery performance, which can be used to prepare compressible supercapacitors, etc.; and the preparation method involved is simple , mild reaction conditions, adjustable composite gel components, suitable for popularization and application.

The invention relates to the field of functional materials. In order to solve the deficiencies and defects of the traditional infrared fire alarms and smoke alarms in the using process at present, theinvention provides a novel resistance type fire detection / early-warning sensor, which is formed by connecting a low-voltage power supply, a warning lamp, a fire early-warning composite material and aplurality of lead wires in sequence, wherein the fire early-warning composite material is prepared from, by weight, 25-45 parts of melamine foam, 8-40 parts of graphene oxide and 15-67 parts of silicon-containing additive. The process is simple and efficient, and the raw material is low in cost. The invention further provides an application of the resistance type fire detection / early-warning sensor. The resistance type fire detection / early-warning sensor is used for monitoring and preventing various types of combustible materials in a high fire risk region, reducing or even avoiding the occurrence of fires and loss caused by the fires.

The present application provides polyacrylonitrile fibers suitable for pile fabrics with different pile heights such as high pile cloth, yarns containing the fibers, and pile fabrics using the yarns. The polyacrylonitrile fiber is a highly shrinkable polyacrylonitrile fiber with a single fiber fineness of 1-7dtex, a shrinkage rate of 20-40%, and a shrinkage bulk of 0.19-0.30mm3 / g, or a single fiber fineness of 2- 7dtex, polyacrylonitrile fiber with elongation of 50-70% and bulkiness of 0.19-0.30mm3 / g.