63results about How to "Little loss of mechanical properties" patented technology

The invention belongs to the field of flame retardant materials, and particularly relates to a composite flame retardant containing a microcapsule-coated intumescent flame retardant and a preparation method. The composite flame retardant containing the microcapsule-coated intumescent flame retardant consists of the following components in percentage by mass: 60-94 percent of microcapsule intumescent flame retardant, 5-25 percent of flame-retardant synergist, 0.9-10 percent of smoke suppressant and 0.1-5 percent of hindered amine light stabilizer. The preparation method comprises the following steps: preparing the microcapsule-coated intumescent flame retardant; placing the microcapsule-coated intumescent flame retardant, the flame-retardant synergist, the smoke suppressant and the hindered amine light stabilizer into a high-speed mixer for mixing uniformly, and discharging to obtain the composite flame retardant containing the microcapsule-coated intumescent flame retardant. Multiple components in the composite flame retardant can play roles in retarding flame in a synergetic way, so that the flame retardance of a high polymer material is improved remarkably, the production of toxic and harmful smog in a burning process can be suppressed, and the flame retarding efficiency is increased greatly.

The invention discloses a flame retardant polypropylene material, relating to the technical field of high molecule plastics. The flame retardant polypropylene material comprises the following compositions in percentage by weight: 25-50 percent of high fluidity homo polypropylene, 25-50 percent of high fluidity propylene copolymer, 10-33 percent of flame retardant, 5-30 percent of inorganic strengthening agent, 1-10 percent of barrier additive, 0.1-3 percent of heat resistance strengthening agent, 0.1-4 percent of antioxygen and nucleating agent, 0.1-3 percent of compound pigment and 1-5 percent of internal and external lubricant. The flame retardant polypropylene material reaches V0 grade flame retardation property without lowering the mechanical performance of the material and has good heat resistance and good anti-seep performance.

The invention discloses a polymer based composite material self-repairing nanometer class capsule and the preparation method thereof, relating to a composite material self-repairing capsule and the preparation method. The invention solves the problems that the prior self-repairing capsule is large in size, cannot bring the self-repairing function into play at the early stage of a crack occurrence. The nanometer class capsule is made by carbamide, formaldehyde solution, dicyclopentadiene, sodium dodecyl benzene sulfonate, resorcinol, normal butanol, octane, KH-560 and deionized water. The preparation method is that: 1. preparing prepolymer of Lauxite; 2. preparing microemulsion; 3. performing polymerization reaction; 4. cleaning, filtering and drying. The grain size of the self-repairing nanometer class capsule is 100 to 800 nm and the capsule can self-repair the nanometer class microcracks which occur on polymer based composite material, preventing the extension of the cracks, reducing the damage of mechanical performance of the polymer based composite material and prolonging the service life. The polymer based composite material self-repairing nanometer class capsule has the advantages of easy preparation, convenient operation, low requirement for the equipment performance and easy promotion.

The invention discloses a flame-retardant light-diffusing PP material with the thermal-oxidative aging resistant function and a preparation method thereof. The PP material comprises a polypropylene resin, a composite flame retardant, a light diffusing agent, a composite antioxidant, a high temperature resistant heat stabilizer, an anti-ultraviolet agent, and other auxiliary agents. The prepared flame-retardant light-diffusing PP material has the characteristics of high luminous flux, good flame retardancy, no precipitation of the flame retardant during the use, long service life, and the like.

The invention discloses a degumming method applicable to green fluorescent protein-containing bave. The degumming method comprises the following steps: drying the bave to be constant-weight, soaking the bave in a pretreating solution in a bath ratio of 1: 50, degumming for 30-120 minutes under the conditions that the concentration of alkaline protease is 0.5-3g/L and the temperature is 40-60 DEG C, washing by water, and drying to obtain the degummed bave, wherein the pretreating solution is a solution with pH of 10 and containing 1g/L sodium carbonate and 0.5g/L penetrant JFC. The degumming method is suitable for degumming the green fluorescent protein-containing bave; by the degumming method, the degumming rate is high and the fluorescent characteristic of the bave can be retained to the maximum extent; after the bave is degummed through the degumming method, the bave has relatively small mechanical performance loss, soft hand feel and good mercerization; through the degumming method, a requirement on degumming of transgenic green bave can be met.

The invention relates to a fiber extending method for carbon fibers through supersonic wave, belonging to a field of weaving processing and weaving machinery. A technical scheme comprises guiding the carbon fiber bundles into a container filled with a supersonic generator and a chemical solution through yarn guide rollers, and the carbon fiber bundles are subjected to drawing effects of two or more tangent yarn guide rollers. By using the technical scheme provided by the invention, the carbon fiber bundles can be obviously extended to be relatively wide and relatively thin, meanwhile, a strength loss of the carbon fibers is small and quality is reliable.

A treatment method of magnesium or magnesium alloy surface relates to the treatment method of metal material surface and solves the problems of the existing magnesium or magnesium alloy in application, such as severe mechanical property loss, excessive degradation speed and local pH value increase caused by the generation of large numbers of hydrogen bubbles accompanied with the degradation process. The method comprises the steps of: firstly, washing and drying parent metal; secondly, using NaOH solution for treating the parent metal after washing; and thirdly, forming a dicalcium phosphate dehydrate layer on the surface of the parent metal. Adopting the NaOH solution for treatment, the method can adjust the magnesium or magnesium alloy surface state and transplants parent material for forming hydroxylapatite into a human body, the mechanical property loss is reduced, the degradation speed is slowed, and the pH value is not changed basically; and the method has simple technique and can form uniform hydroxylapatite on the surface of the parent material, without the falling-off phenomenon.

The invention discloses an antistatic polypropylene composite material capable of being used for an explosion-proof container and a preparation method of the antistatic polypropylene composite material. The polypropylene composite material is prepared from the following raw materials in percentage by weight: 68 to 90 percent of polypropylene, 10 to 25 percent of an antistatic agent, 0.1 to 2 percent of a stabilizer and 0 to 5 percent of other additives. Through the synergistic effect of various antistatic agents, the antistatic polypropylene composite material with the surface resistivity of 10 <5>-10 <8> ohm is obtained, and the antistatic polypropylene composite material is suitable for various injection-molded or blow-molded containers or other products with explosion-proof requirements.

The invention discloses a method for quickly and efficiently recycling a high-performance resin-based carbon fiber composite material. The method is used for solving the technical problem of poor practicability of an existing method for recycling the carbon fiber reinforcement resin-based composite material. According to the technical scheme, the method comprises the steps that a waste carbon fiber reinforcement resin-based composite material is put into glacial acetic acid and pretreated for 30-40 minutes at 108-112 DEG C. The pretreated waste carbon fiber reinforcement resin-based compositematerial is put into a drying oven of 90-95 DEG C for being dried, then put into a mixed solution degradation system with dimethyl sulfoxide and potassium hydroxide and degraded for 40-70 minutes at 150-180 DEG C, and the solid product after degradation is separated, cleaned through deionized water and dried. The dried solid product is weighed, and the degradation rate is calculated. According tothe method, the recycle efficiency is high, the conditions are mild, the surface appearance of recycled carbon fibers is good, and the retention rate for the mechanical properties is high.

The invention relates to the technical field of plastic modification processing, in particular to a flame-retardant synergistic functional master batch special for polyethylene modification and a preparation method thereof. The functional master batch takes multi-composite coated decabromodiphenylethane as a main flame retardant, and the functional master batch comprises the following components by mass percentage: 55.0-70.0 wt.% of multi-composite coated decabromodiphenylethane, 15.0-30.0 wt.% of antimony trioxide, 9.0-13.0 wt.% of an ethylene-octene copolymer, 1.0-2.0 wt.% of styrene-acrylonitrile copolymer coated polytetrafluoroethylene, 0.5-1.0 wt.% of a dispersant, and 0.3-0.5 wt.% of a lubricant. Compared with traditional flame-retardant functional master batch, the functional masterbatch prepared by the invention significantly improves the thermal stability of brominated flame retardants, effectively reduces the material yellowing phenomenon in the thermal machining process, and enhances the flame-retardant effect of domestic brominated flame retardants on polyethylene.

The invention discloses a flame-retardant styrene butadiene rubber, which includes the following raw materials by weight: 100 parts of styrene butadiene rubber-1500, 1 part of stearic acid, 3 parts of sulfur, 5 parts of zinc oxide, 1 part of an accelerator NOBS, 1 part of an antioxidant 4010NA, 10 parts of carbon black N330, 40 parts of white carbon black, 80 parts of hydrotalcite, 10 parts of microencapsulated red phosphorus and 10 parts of tricresyl phosphate. The flame retardant styrene butadiene rubber provided by the invention has the advantages of little mechanical performance loss and obvious flame retardant effect, meets the requirements for industrial production and daily use.

The invention discloses a reversible micro-crosslinking high melt strength polypropylene and a preparation method thereof. To prepare the reversible micro-crosslinking high melt strength polypropylene, the reaction of polypropylene, initiator, free radical stabilizer and active crosslinking agents is carried out, and then antioxidants are added to terminate the reaction to obtain the reversible micro-crosslinking high melt strength polypropylene, wherein the active crosslinking agents are selected from one or more of the ionic liquid with a C5-C30 long hydrocarbon chain. The preparation methodof the reversible micro-crosslinking high melt strength polypropylene includes the steps of evenly mixing the polypropylene, initiator, free radical stabilizer and active crosslinking agents in proportion in a high speed mixer, adding the mixed material to a twin-screw extruder for melt extrusion reaction, and then adding antioxidant masterbatch from side feed to terminate the reaction. The preparation method of the reversible micro-crosslinking high melt strength polypropylene has the advantages of effectively improving the melt strength and mechanical properties of polypropylene materials,and guaranteeing small material performance loss after repeated processing.

The invention relates to the technical field of plastic modification processing and in particular to a special thermoplastic polyurethane modification flame-retardant synergetic functional master batch and a preparation method thereof. The functional master batch adopts multiple composite coated ethylene di(tetrabromo phthalic diamide) as main body flame retardant, and comprises the following components in percentage by mass: 60.0-75.0wt.% of multiple composite coated ethylene di(tetrabromo phthalic diamide), 10.0-25.0wt.% of zinc phosphate, 9.0-13.0wt.% of thermoplastic polyurethane, 1.0-2.0wt.% of styrene-acrylonitrile copolymer coated polytetrafluoroethylene, 0.5-1.0wt.% of a dispersant and 0.3-0.5wt.% of a lubricant. Compared with a conventional flame-retardant functional master batch,the functional master batch disclosed by the invention is capable of remarkably improving the thermal stability of brominated flame retardant, a material yellowing phenomenon in a thermal mechanicalprocessing process can be effectively reduced, and the flame retardant effect of domestic brominated flame retardant on the thermoplastic polyurethane can be improved.

The invention discloses a continuous production process for enabling gold metal to be firmly attached to aromatic special fiber filaments, belongs to the technical field of metallization of special fibers, and relates to a method for continuously and uninterruptedly producing gold-plated aromatic special fibers such as aramid fibers, PBO fibers and polyimide fibers for 24 hours. Firstly, the problems that high-strength fiber metallization cannot leave a laboratory, and stable long fibers with consistent parameters cannot be produced, for example, more than thousands of meters of long fibers cannot be produced at a time are solved; and meanwhile, due to the controllability of the production speed and various electroplating parameters, the technical problems that the fibers are the same in length, different in required conductivity and different in plating layer thickness are solved, and different specifications can be customized according to the special requirements of space flight and aviation.

The invention discloses a concrete-filled steel tube column with T-shaped stiffening ribs on the inner side of a steel tube. The concrete-filled steel tube column with the T-shaped stiffening ribs on the inner side of the steel tube comprises the steel tube and a T-shaped stiffening rib. The steel tube is a square steel tube and filled with concrete, The T-shaped stiffening ribs are embedded in the square steel tube and extend in the height direction of the steel tube. According to the concrete-filled steel tube column with the T-shaped stiffening ribs on the inner side of the steel tube, the longitudinal T-shaped stiffening ribs are arranged on the inner side of the steel tube wall along each side, the concrete-filled square steel tube column with the stiffening ribs is formed, local buckling of the tube wall is delayed, constraint of the tube wall on the concrete is enhanced, the bearing capacity and the deformation performance of a component are improved, and the performance of two materials of steel and the concrete can be brought into play easily.

The invention relates to the technical field of cables and the manufacturing technique thereof, in particular to a method for manufacturing non-halogen coaxial cables. The method comprises the following steps that, firstly, core wires are prepared, the metal core wires are combined to form a set, and an insulation layer is wrapped on the outer layer of the core wire set through extruding equipment, wherein high density polyethylene materials are adopted in the insulation layer; then a metal braiding layer wrapping the insulation layer is formed outside the insulation layer through a braiding machine; a coating wraps outside the braiding layer through extruding equipment, and thermoplastic polyester elastomer (TPEE) is adopted in the coating; finally; irradiation treatment is carried out on wires coated with the coating to obtain finished products. Through the adoption of the technical scheme, manufactured products have good engineering characteristic, and the performance of high temperature resistance, erosion resistance and aging resistance of the products are improved. Meanwhile, the method for manufacturing the coaxial cables can further simplify production procedures, and reduce production cost.