42results about How to "No reduction in mechanical properties" patented technology

The invention discloses a microwave radiation reclaiming method for environment-friendly high-strength reclaimed rubber, and belongs to the technical field of waste rubber reclaiming. The method comprises the following steps of: mixing waste rubber outer tire crown powder with the particle size of 20 meshes, rosin and dipentene according to a certain proportion; uniformly feeding the materials with a certain thickness on a roller way conveying device; determining the length of a roller way according to microwave radiation time; arranging a high-frequency microwave radiation device on the roller way; conveying the materials on the roller way for reclaiming the materials by microwave radiation during conveying; continuously putting the reclaimed rubber materials into a cooling device through the roller way; directly discharging the cooled materials to an open mill for performing refining, wherein the refining temperature is controlled to be 35-50 DEG C; and refining at low temperature on the open mill for 20 minutes to obtain a refined rubber sheet with smooth surface and uniform texture. A test result shows that the tensile strength of the reclaimed rubber is more than 18MPa, the breaking elongation is over 400%, and the Weigert plasticity is 0.35-0.45. The microwave radiation reclaiming method has the advantages of environment friendliness, short reclaiming time, low reclaiming temperature, energy conservation and high production efficiency.

A curable resin composition for light guide characterized by containing as essential components copolymer (A) from radically polymerizable compound (a) having in its molecule an acid group of acid anhydride group and / or acid group blocked and a radically polymerizable unsaturated group and other radically polymerizable compound (b); polymerizable unsaturated compound (B); and polymerization initiator (C). There is further provided a curable dry film for light guide consisting of this composition; and provided a light guide having at least one of underpart clad layer (13), core portion (15) and upper part clad layer (17) formed therefrom.

One aspect of the invention relates to a methacrylate resin prepared by suspension polymerization using a polyalkylacrylate-acrylic acid as a suspension stabilizer. The suspension stabilizer is used in an amount of about 0.05 to about 0.25 parts by weight per 100 parts by weight of a monomer mixture. Another aspect of the invention relates to a method for preparing a methacrylate resin, which comprises: preparing a mixture by mixing an initiator and a chain-transfer agent with a monomer mixture comprising at least about 50% by weight of alkyl methacrylate; and adding the mixture to an aqueous solution of polyalkylacrylate-acrylic acid to conduct suspension polymerization.

The invention discloses a method of medical nickel titanium alloy differential arc oxidation treatment, which comprises the following steps: (1) pre-treating surface; (2) putting into hydraulic fluid;choosing NiTi ally as positive pole and loading trough as negative pole; treating; (3)washing; drying; getting the product. This invention possesses simple method, which can inhibit discharging of Niion in nickel titanium alloy and reinforce safety.

The present invention relates to a thread embedding therapy rope and a thread embedding therapy needle apparatus comprising same, and disclosed are a thread embedding therapy rope and a needle apparatus comprising same, the rope comprising a linear core, which comprises a biodegradable polymer, and a metal wire, which is arranged to spirally encompass the outer circumferential surface of the linear core, wherein the metal wire comprises a biodegradable metal formed with magnesium or zinc as a main component, so as to have no side effects on biological tissue when applied to the human body by means of thread embedding therapy, pulling force on the tissue can be strengthened, lifespan can be extended over that of a conventional embedded thread of a biodegradable polymer, the drug loading capability of the embedded thread itself can be increased so as to allow for usefulness as a drug carrier, and a drug can be delivered through a simple method.

The invention discloses a PC / ABS material composition for relieving the yellow discoloration, which is prepared from the following ingredients in percentage by weight: 10 to 60 parts of acrylonitrile-butadiene-styrene graft copolymers, 30 to 85 parts of polycarbonate, 0 to 10 parts of acrylics graft rubber, 0.25 to 0.88 parts of coloring agents, 0 to 1 part of antioxidizers and 0 to 1 part of light stabilizers. Yellow dyes without light illumination resistance performance exist in a dye system, and the dyes can not influence the whole coloring process of plastics in the plastic coloring process, but in the light illumination process, the dyes gradually fade, the PC / ABS materials carry out yellow discoloration in the light illumination process, so the two mutually inconsistent processes have the mutual counteraction effect, and the color aberration of the whole PC / ABS composition is reduced after the light illumination. At the same time, the mechanical property of the composition material is not obviously reduced.

The invention discloses a low addition type halogen-free and flame-retardant polylactic acid composite and a preparation method thereof. The composite is prepared from polylactic acid, a flame retardant, an optional flame retardant additive, an optional antioxidant and an optional lubricant, wherein the flame retardant is a phosphate, phosphamide, phosphoryl ester or phosphoramidate compound; the flame retardant additive is inorganic filler or organically modified inorganic filler. The preparation method of the polylactic acid composite comprises the following steps: polylactic acid is dried under vacuum and uniformly mixed with the flame retardant, the optional flame retardant additive, the optional antioxidant and the optional lubricant, and the mixture is placed in a twin-screw extruder for melt blending and extrusion pelletizing. The low addition type halogen-free and flame-retardant polylactic acid composite is low in adding quantity of the flame retardant, good in flame retardance and environment-friendly, and the mechanical properties are not reduced but are even increased; the preparation method is simple, convenient, fast, low in cost and suitable for industrial production.

The invention discloses a preparation method of heat-expandable polyurethane, which comprises the following steps: adding raw material modified expansion agent, halogen-containing flame retardant, and thermoplastic polyurethane elastomer into a dense mixture at a weight ratio of 2-4:1-2:35-45 The heat-expandable polyurethane is obtained by blending in a mill, and then hot-pressing. The invention overcomes the shortcomings of the prior art, and the flame retardant has little influence on the mechanical properties of the polyurethane, and the flame-retardant effect is good.