31results about How to "Change brittleness" patented technology

The present invention relates to a high-strength and heat-resistant polylactic acid material for 3D printing, wherein the components comprise, by mass, 100 parts of a L-polylactic acid resin, 1-20 parts of an inorganic filler, 0.01-5 parts of a polycarboxylic acid metal salt, 0.1-5 parts of an amide compound, 0.1-5 parts of a plasticizer, 0.1-1 part of an antioxidant, and 0.1-2 parts of an anti-hydrolyzing agent, wherein the molecular weight of the L-polylactic acid resin is 100000-400000, the anti-hydrolyzing agent is mixing at least one or more than two selected from a Polycarbodiimide compound, a single carbodiimide compound and a compound having an active group epoxy, the inorganic filler is a mixture formed from one or at least two selected from nanometer silica, talc powder, calcium sulfate crystal whisker and mica, and the diameter of the inorganic filler is 0.05-5 [mu]m. According to the present invention, the tensile strength achieves more than or equal to 60 MPa, the bending strength achieves more than or equal to 100 MPa, the Vicat softening temperature is more than or equal to 120 DEGC, the mechanical property and the heat resistance are substantially improved compared with the commonly used PLA, and the practicality and the application range of the PLA supplies are substantially improved.

The invention relates to a metal repair adhesive for machining, and belongs to the field of mechanical processing technology. The invention provides a machinable metal repair adhesive. The adhesive is composed of one component comprising by weight 25-35 parts of bisphenol A diglycidyl ether, 0.3-0.7 part of organic polysiloxane,48-65 parts of a metal powder, 2-12 parts of gaseous phase white carbon black, 30-50 parts of a curing agent, 25-45 parts of a low-molecular polyamide resin and 15-25 parts of gaseous phase silica. Compared with the prior art, the invention has the following advantages: 1, the metal repair adhesive has high bond strength and hardness; 2, after curing, the hardness and strength can meet the requirements of machining; and 3, the repair adhesive provided by the invention can be bonded to a metal surface with oil or water, and can cure in oil or water.

The invention relates to a carbon fiber reinforced gypsum board and a preparation method thereof. The technical problem that a gypsum board is low in rupture strength, poor in compressive strength andpoor in waterproof performance in the prior art is solved. The carbon fiber reinforced gypsum board provided by the invention is prepared from the following raw material components: 70-110 parts of agypsum powder, 20-30 parts of diatomite, 5-10 parts of glucose, 4-12 parts of an admixture, 160-200 parts of water and 20-30 parts of chopped carbon fibers. Moreover, the invention further provides apreparation method of the carbon fiber reinforced gypsum board. The carbon fiber reinforced gypsum board disclosed by the invention is widely applied to the technical field of building materials.

The invention discloses a heat-fused highly-wear-resisting anti-pollution white traffic marking material and a preparation method thereof, and the preparation method is used for manufacturing the traffic marking material in the traffic technical field. The heat-fused highly-wear-resisting anti-pollution white traffic marking material comprises the following components: petroleum resin, modified rosin resin, di-n-butyl ortho-phthalate, titanium dioxide, glass bead, stilbene biphenyl sodium disulfonate, ethylene vinyl acetate copolymer, microcrystalline wax, refined white mineral oil, quartz sand and quartz powder. The traffic marking material prepared by adopting the preparation method disclosed by the invention not only can be used for improving the wear resistance and anti-pollution capacity of the traffic marking, but also strengthening the adhesion force of the traffic marking.

The invention relates to an arc-shaped bridge membrane laminating as-cast finish template and a production process thereof. The template comprises melamine impregnated paper, poplar veneers and a core curtain; the arc-shaped bridge membrane laminating as-cast finish template sequentially comprises upper-layer melamine impregnated paper, an upper-layer poplar veneer, the core curtain, a lower-layer poplar veneer and lower-layer melamine impregnated paper from top to bottom; a blank assembling sequence of the core curtain from top to bottom is a long curtain, a long curtain, a short curtain and a long curtain, namely the core curtain totally comprises four layers; the upper-layer poplar veneer is coated with a modified adhesive and is vertically arrayed; the lower-layer poplar veneer is coated with the modified adhesive and is transversely arrayed; and all the layers are compounded into a whole body through gluing and hot pressing. The production process comprises: (1) preparing the melamine impregnated paper; (2) preparing the core curtain; (3) preparing the poplar veneers; (4) assembling a blank of the template; and (5) gluing, hotly pressing and molding. According to the template, a blank assembling structure is adjusted and a surface adhesive type is improved to realize a softening effect, so that the effect that the template can be randomly bent and is not cracked, deformed and broken is realized; and the effect of a manufactured bridge is good and the requirements needed by a curved-surface bridge are met.

The invention discloses an artificial bone scaffold composite material based on kangaroo bone and a preparation method of the artificial bone scaffold composite material. The material is a blended material composed of kangaroo bone powder, calcium pyrophosphate Ca2P2O7, a pore-forming agent, a solvent, a catalytic curing agent and a bonding agent. The method comprises the following steps of adding dry kangaroo bone powder, the calcium pyrophosphate, the pore-forming agent, the solvent, the catalytic curing agent and the bonding agent into a mixing-type torque rheometer for fusion and smelting till a torque is balanced, thereby obtaining the artificial bone scaffold composite material based on the kangaroo bone; finally obtaining an artificial bone scaffold through a 3D (three-dimensional) fused deposition modeling technology. The artificial bone scaffold based on the kangaroo bone disclosed by the invention has the advantages that the biocompatibility is kept and the mechanical defects are conquered at the same time; compared with the existing PLA / PLGA, PLA / PLGA / TCP (polylactic acid / poly(lactic-co-glycolic acid) / tertiary calcium phosphate) artificial bone scaffolds, the rigidity, hardness and elastic modulus of the artificial bone scaffold based on the kangaroo bone are all enhanced.

The invention discloses a method for preparing an oxidized carbon fiber-reinforced phenolic resin friction composite material by a burning method. First, the carbon fibers are burned with butane gas for 5-60 minutes to obtain carbon fibers with a large number of oxygen-containing functional groups such as -COOH and -OH on the surface. . The calcined carbon fibers were then combined with APTES-modified β-Si 3 N 4 , phenolic resin and curing agent (H256) are mixed with pre-dipping liquid in a mass ratio of 30-40:60-70. After removing the solvent from the prepreg, hot-press curing at a temperature of 130-150° C., a hot-pressing time of 20 minutes, and a pressure of 5 MPa to obtain a fired carbon oxide fiber / phenolic resin friction composite material. The sample was subjected to friction and wear test, and its thermal conductivity was 3.06W m ‑1 k ‑1 , the coefficient of kinetic friction reaches 0.13, and the wear rate is as low as 1.14×10 ‑8 mm 3 / Nm. The friction composite material exhibits excellent tribological properties, and has a simple preparation process, low cost and no pollution.

The invention relates to the field of biomedical metal products, in particular to a nano-titanium-dioxide coated root canal file and a preparation method thereof. The nano-titanium-dioxide coated rootcanal file takes nickel-titanium shape memory alloy as a matrix, a nano titanium dioxide coating film is prepared on the surface of the matrix, and the thickness of the nano titanium dioxide coatingfilm is 60 nm-100 nm. The nano-titanium-dioxide coated root canal file adopts the Ni-Ti shape memory alloy and has biological functionality, and the mechanical property of the nano-titanium-dioxide coated root canal file is suitable for a human body; and the nano-titanium-dioxide coating film on the surface of the root canal file has biocompatibility of biological ceramic, is non-toxic, has good biological safety, and has great advantages and application prospects. A film coating method adopted in the preparation method of the nano-titanium-dioxide coated root canal file is simple in process,but the film coating effect is good. The nano-titanium-dioxide coated root canal file is safe to use in medicine and good in practicability.

The invention discloses a hot-melt high wear-resistant and anti-pollution white traffic marking material and a preparation method thereof, which are used for making traffic marking materials in the field of traffic technology 。 Including the following components: petroleum resin, modified rosin resin, di-n-butyl phthalate, titanium dioxide, glass microspheres, sodium distyrene biphenyl disulfonate, ethylene vinyl acetate copolymer, microcrystalline paraffin, refined white Mineral oil, quartz sand, quartz powder. The traffic marking material prepared by the invention can not only improve the wear resistance and anti-pollution ability of the traffic marking, but also enhance the adhesion of the traffic marking.

The invention discloses a processing technology of cotton felt. The processing technology of the cotton felt comprises the following steps: (1), cotton blending, wherein the ratio of PET to hollow fiber to LPET is 30%:40%:30%; (2), cotton mixing; (3), opening; (4), carding; (5), cotton laying; (6), hot baking, wherein the temperature is maintained at 220-250 DEG C, and the fan is controlled at 1200 + / - 200 rev / min; (7), rolling, wherein the thickness of the cotton felt is controlled at 10 + / - 2mm; (8), fan cooling: normal temperature; and (9), cutting and shipping. The cotton felt produced bythe processing technology of the cotton felt provided by the invention is small in volume and convenient to transport, and can be reused after being restored to the original state by heating.

The invention relates to a permanently modified phosphogypsum composite thermal insulation template and a manufacturing method thereof. The composite thermal insulation formwork is prepared by coating the outside of the extruded board (1) with an interface agent (2), then coating the outside with a modified phosphogypsum slurry (4), and filling the middle of the modified phosphogypsum slurry with a reinforcing material (3). Modified phosphogypsum slurry is made by mixing calcined phosphogypsum powder, cement, fly ash, quicklime, slag micropowder, vitrified microspheres, latex powder, water reducer, retarder, etc. in a certain proportion and then mixed with water. The invention has the advantages of simple preparation process, fast forming, large output, time-saving, labor-saving and labor-saving, and most of the raw materials used are solid waste, which conforms to national policies, is energy-saving and environmentally friendly, and has remarkable economic benefits.

Bio-medical implanting material with biomimetic nano film and its use are both disclosed herewith. The implanting material uses NiTi shape-memory alloy as base with biomimetic nano TiO2 bio-ceramic film of 100-200nm to stop Ni ions liberated in human body liquid. It can be used as implanting device, e.g. tubular support, bone fixer, bone orthotic device, and oral orthodontic material, etc.

The invention relates to an arc-shaped bridge membrane laminating as-cast finish template and a production process thereof. The template comprises melamine impregnated paper, poplar veneers and a core curtain; the arc-shaped bridge membrane laminating as-cast finish template sequentially comprises upper-layer melamine impregnated paper, an upper-layer poplar veneer, the core curtain, a lower-layer poplar veneer and lower-layer melamine impregnated paper from top to bottom; a blank assembling sequence of the core curtain from top to bottom is a long curtain, a long curtain, a short curtain and a long curtain, namely the core curtain totally comprises four layers; the upper-layer poplar veneer is coated with a modified adhesive and is vertically arrayed; the lower-layer poplar veneer is coated with the modified adhesive and is transversely arrayed; and all the layers are compounded into a whole body through gluing and hot pressing. The production process comprises: (1) preparing the melamine impregnated paper; (2) preparing the core curtain; (3) preparing the poplar veneers; (4) assembling a blank of the template; and (5) gluing, hotly pressing and molding. According to the template, a blank assembling structure is adjusted and a surface adhesive type is improved to realize a softening effect, so that the effect that the template can be randomly bent and is not cracked, deformed and broken is realized; and the effect of a manufactured bridge is good and the requirements needed by a curved-surface bridge are met.

A bonding material applied to a steel surface and bituminous concrete comprises a component A and a component B at the ratio of 2 to 1, wherein the component A comprises the following ingredients in parts by weight: 2.5-3 parts of an active environment-friendly thinner, 75-90 parts of epoxy resin E51, 5-8 parts of a reactive diluent 501, 2-5 parts of dipropylene glycol and 8-12 parts of an epoxy resin flexibilizer; the component B comprises the following ingredients in parts by weight: 4-6 parts of an active environment-friendly thinner, 8-12 parts of a polyamide curing agent 651, 35-50 parts of a modified amine hardener, 0.8-1.2 parts of an accelerant MP-30, 1.2-1.8 parts of a silane coupling agent Si-69 and 4-6 parts of magnesium oxide. The bonding material has the advantages of being convenient in construction, high in bonding strength, high in impact resistance and high in damage resistance and has the effects of being high in tensile strength, shearing resistance, heat resistance, water resistance and rust resistance.

The invention discloses a strong-strength 3D printing PLA material, which comprises the following components in parts by mass: 100 parts of poly-L-lactic acid resin, 1 to 20 parts of an inorganic filler, 0.01 to 5 parts of metal polycarboxylate, 0.1 to 5 parts of an amide compound, 0.1 to 5 parts of a plasticizer, 0.1 to 1 part of an antioxidant and 0.1 to 2 parts of a hydrolysis resistant agent, wherein the hydrolysis resistant agent is at least one of a polycarbodiimide compound, a monocarbodiimide compound and an acrylic copolymer with an active epoxide group; the inorganic filler is one or a mixture formed by at least two of nano silica, talc powder, a calcium sulfate whisker and mica, and the diameter of the inorganic filler is 0.05 to 10 [mu]m. According to the strong-strength 3D printing PLA material, the mechanical performance can also be improved, the tensile strength of the material reaches 63 MPa or above, the brittleness of PLA is changed, and higher pressure and wear can also be born.

The invention discloses a processing technology of cotton felt. The processing technology of the cotton felt comprises the following steps: (1), cotton blending, wherein the ratio of PET to hollow fiber to LPET is 30%:40%:30%; (2), cotton mixing; (3), opening; (4), carding; (5), cotton laying; (6), hot baking, wherein the temperature is maintained at 220-250 DEG C, and the fan is controlled at 1200 + / - 200 rev / min; (7), rolling, wherein the thickness of the cotton felt is controlled at 10 + / - 2mm; (8), fan cooling: normal temperature; and (9), cutting and shipping. The cotton felt produced bythe processing technology of the cotton felt provided by the invention is small in volume and convenient to transport, and can be reused after being restored to the original state by heating.

The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a fully biodegradable polyester copolymer. The present invention adopts the method of melt direct polycondensation to prepare the carboxyl-terminated lactic acid prepolymer, and then carries out copolymerization with aliphatic polycarbonate diol, and then carries out reaction extrusion chain extension in a twin-screw extruder, and the preparation performance Good polylactic acid copolymer. The specific steps are: lactic acid and small molecule dibasic acid are reacted and directly polycondensed under catalyst conditions to form a carboxyl-terminated lactic acid prepolymer, then add aliphatic polycarbonate diol and catalyst, and vacuumize under N2 atmosphere, at 150 At ~200°C, react for 1-10 hours to obtain low-molecular-weight polylactic acid / polycarbonate copolymer, and then perform reaction extrusion chain extension in a twin-screw extruder at 140-190°C to finally obtain high-molecular-weight Polylactic acid copolymer with good toughness and heat resistance. The method of the invention has simple process and is easy for industrialized production, and the prepared copolymer resin product can be completely biodegraded and has wide application fields.

The invention discloses a heat melting high-wear-resistant anti-pollution yellow traffic marking material and a preparation method thereof. The preparation method is used for preparing the traffic marking material in the technical field of traffics. The heat melting high-wear-resistant anti-pollution yellow traffic marking material comprises the following components: petroleum resin, modified rosin resin, di-n-butyl phthalate, glass beads, an ethylene vinyl acetate copolymer, microcrystalline wax, refined white mineral oil, quartz sand, quartz powder and cadmium yellow. The traffic marking material prepared by using the preparation method not only can be used for improving the wear resistance and anti-pollution capacity of a traffic marking, but also can be used for increasing the adhesive force of the traffic marking.