111results about How to "High physical and mechanical strength" patented technology

The invention relates to a self-repairing polyurethane hydrogel and a preparation method thereof. The polyurethane hydrogel comprises the following components in parts by mass: 10-30 parts of polyisocyanate, 30-50 parts of hydrophilic polyester polyol or hydrophilic polyether polyol, 10-50 parts of acrylamide monomer, 0.5-3 parts of chain extender, 3-10 parts of methacrylic acid functional monomer containing an UPy unit, 0.5-2 parts of catalyst and 0.5-3 parts of photoinitiator. The preparation method comprises the following steps of firstly preparing a hydrophilic polyurethane macromonomer terminated with an acrylic acid monomer and carrying out radical polymerization with the methacrylic acid functional monomer containing the UPy unit under the action of photo-initiation. According to the self-repairing polyurethane hydrogel, the self-repairing of the damage of the polyurethane hydrogel can be completed without need of any repairing agent or specific environmental requirements, the polyurethane hydrogel has the advantages of high repairing efficiency, high mechanical strength and low cost and the repeatedly repairing function can be achieved on the same site.

Techniques, mixtures and improved porous materials (interconnected porous constructs) that are capable of maintaining a sufficient porosity while conferring improved mechanical and physical strength to the final construct. A sacrificial construct (for example, a sacrificial material such as polymethyl methacrylate (PMMA)) is used to obtain an inverse porosity of the construct it was molded into. The process provides a less porous end material that may be used as an arthroplasty device or surgical implant (for example, an interference screw of suture anchor) among many other applications. The process employs a sacrificial material to reduce the porosity of the final construct to about 35%.

The invention discloses a shielding longitudinal watertight degaussing cable and a production method thereof for ships. A tinned copper wire is impregnated with a sealant and then twisted into a twisted copper conductor which is impregnated with a conductor sealant layer on the periphery, an electro-insulating rubber layer is extruded on the periphery of the conductor sealant layer to form insulation core wires, chloroprene rubber filling bars are filled into gaps between the insulation core wires, and a plurality of insulation core wires are twisted wholly into a cable core. A cable core inner sealant layer, an inner jacket rubber layer, an armor shielding layer and an outer jacket rubber layer are sequentially arranged on the periphery of the cable core. A single wire of the cable conductor is impregnated with the sealant, the twisted copper conductor is impregnated with the conductor sealant layer on the periphery, the cable core inner sealant layer is extruded on the periphery of the cable core to form multiple sealing, the chloroprene rubber filling bars swell during follow-up vulcanization and can fill in the gaps inside the cable core completely, and tangency between the insulation core wires can be avoided, so that the sealant can permeate to the inside of the cable core to guarantee the watertight effect when the cable core inner sealant layer is extruded.

The invention relates to a linear low-density polyethylene composition comprising components of, by weight: 50-98 parts of linear low-density polyethylene with a density of 0.918-0.922g/cm<3> and a melt flow index of 0.1-10g/10min, 0.5-45 parts of low-density polyethylene with a density of 0.910-0.925g/cm<3> and a melt flow index of 0.1-30g/10min, 0.5-45 parts of high-density polyethylene with a density of 0.941-0.970g/cm<3> and a melt flow index of 0.5-10g/10min, 0.5-45 parts of polypropylene with a density of 0.830-0.910g/cm<3> and a melt flow index of 0.5-50g/10min, 0.1-20 parts of an ethylene-vinyl acetate copolymer with a density of 0.926-0.939g/cm<3>, 0.01-1 part of a rheology modifying agent, and 0.5-20 parts of a compatibilizing agent with a melt flow index of 0.5-50g/10min. With the composition, extrusion processing performance can be effectively improved, a melt fracture phenomenon can be eliminated, and the compatibility can be improved. With the composition, the strength, flexibility and aging resistance of a product can be improved. The composition can be used for producing films, drip irrigation tapes, and pipes with various specifications.

The display unit comprises a display device such as liquid crystal cell or the like; and a secondary battery disposed to a rear side of the display device. A heat shielding layer having a thermal conductivity of at most 5 W/mK, preferably at most 1 W/mK is formed as a heat shielding plate between the display device and the secondary battery, and the display device and the secondary battery are integrally assembled to form a module structure. According to the above structure of the present invention, since the display device such as liquid crystal cell or the like and the secondary battery are integrally assembled to form a module structure, the display unit can be made compact and thin to attain a light weight.

A battery paste additive, and process for making the same comprising micronized seed crystals of tetra basic lead sulfate, is added to battery paste and results in accelerated curing time and other improvements in battery performance. The battery paste additive may be used to produce positive or negative battery plates and may be use with conventional mixing, pasting and curing processes and equipment.

The invention discloses a method for using thin-wall bamboo materials to prepare bamboo scrimbers. The method includes the steps that alkali is adopted for stewing thin-wall bamboo sheets, and then defibering, gum dipping, laying and hot pressing are carried out in sequence; NaOH is used for stewing the bamboo sheets, and the bamboo sheets are processed by lipase and then subjected to defibering,wherein by means of the procedures above, the defibering effect of bamboo bundles is obviously improved by 35% or above, bamboo green and tabasheer on the surfaces of the bamboo materials are effectively subjected to chemical erosion, the purpose of breaking wax layers and silicon layers is achieved, and the effect of improving gluing is achieved. A waste liquid generated after stewing is used fordiluting a glum liquid, and the problem of discharging the waste liquid is solved; by adopting a vacuum pressurizing dipping mode, even permeation of an adhesive in the bamboo materials is achieved,consumption of the adhesive is reduced, the production cost is reduced, efficient utilization of the thin-wall bamboo materials is achieved, and the environment is protected. The physical and chemicalstrength of the scrimbers are obviously improved, the horizontal shearing strength is improved by 25% or above, the thickness swelling rate of water absorption is reduced by 100% or above, the bending strength is improved by 20% or above, and the elasticity modulus is increased by 15% or above.

The invention discloses a degumming method of silk, which belongs to the technical field of silk. The degumming method comprises the following steps of preparing the silk, tying the silk with polyester threads, putting the silk in a Na2CO3 solution with certain concentration, heating, boiling, adjusting the pH value of the solution to 9-11, and applying ultrasonic waves to the solution; and washing with deionized water, removing sericin, and drying the degummed silk. The degumming method disclosed by the invention has the advantages that by changing the degumming condition and applying the ultrasonic waves, the breaking strength loss and the breaking elongation of the degummed silk are reduced, and the physical and mechanical strength of the degummed silk is effectively improved; the time is short, the cost is low and the degumming efficiency is high.

The invention discloses anti-wrinkle crease-free non-woven fabric polyurethane synthetic leather used for shoes and a preparation method thereof. The preparation method comprises the steps that fiber screen laying and needling are carried out on a spunlaced non-woven fabric surface, and a anti-wrinkle non-woven base is formed; after dipping carried out in a polyurethane dipping sizing agent is finished, condensing and ironing are carried out in a DMF aqueous solution; after coating is carried out by a polyurethane coating, the condensing, washing and drying are sequentially carried out; a post-processing grinding machine is used for carrying out orientated grinding on the surface of a semi-finished product; one layer of a thermoplastic polyurethane resin dry coating sizing agent is coated on release paper, after drying is conducted, one layer of a thermoplastic polyurethane dry bonding layer sizing agent is coated on the release paper, then drying is carried out in a drying oven until the release paper is half-dried, and a dry synthetic leather semi-finished product is obtained; the dry synthetic leather semi-finished product is attached to the wet synthetic leather semi-finished product, and after drying and ripening are conducted, the non-woven fabric polyurethane synthetic leather is obtained. The non-woven fabric polyurethane synthetic leather has the advantages that wrinkles cannot be generated, the physical mechanical strength is high, meanwhile sizing of shoemaking is good, and the durability is good; processing and performance requirements for children shoes, sport leisure shoes and the like are completely met.

A friction stir welding method for a metal material for longitudinally welding members to be butted and then welded with complicated shape portions in section at end portions. The friction stir welding method includes preparing members to be welded and formed with excess thickness portions and a welding tool provided with a probe; performing a first welding to the members to be welded; inserting the welding tool from the excess thickness portion to cause plastic flow of the metal material subsequent to the butt-welding; and performing a second welding.

The invention discloses a 90DEG C cracking-resistant moisture-resistant and flame-retardant polyethylene cable material and a preparation scheme thereof. The cable material is composed of the following components by weight: 60-90 parts of polyethylene, 10-20 parts of a vinyl copolymer, 10-20 parts of a compatilizer, 50-100 parts of a hydroxide flame retardant, 5-20 parts of sepiolite, 5-20 parts of a synergistic flame retardant, 1-3 parts of aminosilane, 1-3 parts of an antioxidant, 0.5-1.5 parts of an ultraviolet light absorber and 2-5 parts of a lubricant. The 90-DEG C cracking-resistant moisture-resistant and flame-retardant polyethylene cable material disclosed by the invention has the characteristics of resistance to a low temperature of -50DEG C, outstanding cracking resistance, insulativity and moisture resistance (volume resistivity of 70DEG C*168h after immersion), good flame retardance, low smoke, no toxicity and the like, also has the advantages of fast extrusion processingspeed, difficult generation of air holes, etc., and can be widely applied to an outer sheath layer of a 1kV-220kV cable.

The invention discloses a polyethylene composite with excellent puncture resistance and weather resistance, and belongs to the field of high polymer materials. The composite is characterized by being prepared from the following components in parts by weight: 80-90 parts of polyethylene resin A, 5-15 parts of polyethylene resin B, 0.3-0.7 parts of antioxidant, 1.5-2.5 parts of nano titanium oxide and 0.1-0.3 parts of ultraviolet absorber, wherein the polyethylene resin A is a copolymer of ethylene and 1-butylene or/and 1-hexylene; the density is 0.917-0.924g/cm<3>; a melt flow rate (MFR) is 1.6-2.4g/10min; the polyethylene resin B is metallocene polyethylene; the density is 0.916-0.922g/cm<3>; and an MFR is 37-43g/10min. The composite has good ultraviolet ageing resistance, good puncture resistance and higher physical and mechanical strength; and the strength of a film material after long-term use under an ultraviolet condition can be improved.

The invention relates to a method for preparing a polyacrylate/nano ZnO composite leather finishing agent by Pickering emulsion polymerization. When the polyacrylate finishing agent prepared by conventional emulsion polymerization uses a surfactant, the dry/wet rubbing resistance of the finished leather can be lowered. The method comprises the following steps: mixing and heating zinc acetate dihydrate and ethanol to obtain a zinc acetate dihydrate-ethanol solution; adding lithium hydroxide, and carrying out ultrasonic treatment to obtain a nano ZnO alcosol; adding distilled water, stirring, centrifuging, separating, washing with water, and dispersing in distilled water to obtain a nano ZnO water dispersion; and dropwisely adding butyl acrylate-methyl methacrylate mixed monomers, dropwisely adding an ammonium persulfate water solution, keeping the temperature, and cooling to obtain the finishing agent. By using the nano ZnO sol prepared by the sol-gel process instead of the traditional surfactant, the polyacrylate/nano ZnO composite leather finishing agent prepared by Pickering emulsion polymerization has the advantages of favorable physical and mechanical strength and higher dry/wet rubbing resistance.

The invention discloses a cold-zinc-spray long-acting anti-corrosive coating. The coating comprises the components in a weight ratio: 11%-14% of silicone-grafted polymer, 78%-83% of ultrafine zinc powder and 6%-8% solvent gasoline. Compared with existing similar products, the product, of which the content of metallic zinc in dry paint film is greater than 96%, has the same antirust effect as hot galvanizing and a steel structure is protected from being corroding for 20-25 years in a severe marine-atmosphere environment; the anti-corrosive coating has the advantages of high bonding strength, salt-spray corrosion resistance, single component and convenience in construction and operation and the service life of the steel structure is significantly prolonged.

The invention discloses a modified glass microsphere and a preparation method thereof and a method for preparing a composite resin product by using the modified glass microsphere. The modified glass microsphere includes a first class glass microsphere and a second class glass microsphere, a discontinuous metal layer and an ultraviolet absorbent wrap the surface of the first class glass microsphere, a hydrophobic material wraps the surface of the second class glass microphere, the coverage rate of the metal layer on the surface of the first glass microsphere is 45.0%-85.0%, and the modified glass microbead is added into the component of a common anti-yellowing product to improve the anti-yellowing property and the mechanical property of the product.

The invention discloses an environment-friendly and durable sisal bag and a preparation method thereof. The environment-friendly and durable sisal bag comprises raw materials in parts by weight as follows: sisal fibers, shengma fibers, ramie fibers, bamboo fibers, carbon fibers, banana fibers, konjac starch, polyvinyl alcohol, polyvinyl chloride, aromatic particles, negative ion mineral particles, thermoplastic polyurethane, titanium dioxide, laccase, agar, a plasticizer, a surfactant, a plant extract solution and an antibacterial agent. The natural degradable fibers including the sisal fibers, the shengma fibers, the ramie fibers, the bamboo fibers, the carbon fibers and the banana fibers are selected as the main raw materials, the plastic bag can be degraded rapidly in a natural state by means of combined use of titanium dioxide and the laccase, and by means of cooperation with other additives such as the plasticizer, the surfactant and the like, the environment-friendly and durable sisal bag is easy to degrade and has higher environmental resistance, water resistance, durability and antibacterial property.