19results about How to "High tensile modulus" patented technology

The invention belongs to the technical field of high polymer material processing, and discloses a preparation method of high-modulus para-aramid, which comprises the following steps: dipping para-aramid wet fibers obtained by dry-jet wet spinning in acetone at room temperature, taking out and airing, and then carrying out constant-tension heat treatment in a dry nitrogen atmosphere to obtain the high-modulus para-aramid. The high-modulus para-aramid fiber is prepared; the temperature of the constant tension heat treatment is 325-350 DEG C, and the tension is 0.80-1.10 cN / dtex; compared with a contrast sample, the tensile modulus of the high-modulus para-aramid fiber is increased by 17-32%; the contrast sample is prepared by directly carrying out constant-tension heat treatment on para-aramid wet fibers in a dry nitrogen atmosphere without acetone dipping treatment. According to the preparation method, the tensile modulus of the para-aramid can be greatly improved, the operation is simple, the production cost is low, and the preparation method can be used for a large-scale industrial production line of the high-modulus para-aramid.

The invention relates to the technical field of polyaryletherketone foam materials, in particular to a preparation method of a high-strength porous polyaryletherketone foam material. The high-strength porous polyaryletherketone foam material comprises the following substances in parts by weight: 80-95 parts of polyaryletherketone resin; 5-20 parts of a porous modified material; 0.1 to 1.0 part of a nucleating agent; 0.1 to 1.0 part of an antioxidant; the polyaryletherketone resin comprises at least one of polyether-ether-ketone resin, polyether-ketone-ketone resin and phenolphthalein polyaryletherketone resin. According to the technical scheme, the components of the porous polyaryletherketone foam material are optimized, the polyaryletherketone resin, the porous modified material, the nucleating agent and the antioxidant are selected for preparation, the strength and toughness of the material are improved through introduction of the porous modified material, the overall weight of the material is reduced, and the trend of modern lightweight design is met.

The invention discloses a high-toughness carbon-glass super-hybrid composite material as well as a preparation method and application thereof. Carbon fiber broadened filaments and glass fiber broadened filaments prepared by ultrathin carbon fiber spreading equipment are subjected to super-hybrid doubling, and the carbon-glass super-hybrid composite material with better reinforcing and toughening effects is prepared through a vacuum-assisted resin transfer molding process. An existing mixing method is improved, the problems that an interlayer mixing method is poor in mixing designability, low in fiber mixing degree, poor in toughening effect and the like are solved, the prepared carbon-glass super-mixed composite material has better reinforcing and toughening effects, and under the same carbon-glass volume ratio, the carbon-glass super-mixed composite material has the better reinforcing and toughening effects. The carbon-glass super-hybrid composite material is higher in tensile modulus, elongation at break and loss factor, and a drop hammer impact test shows that the carbon-glass super-hybrid composite material has the characteristics of larger energy absorption, small damage area and the like. In conclusion, the carbon-glass super-hybrid composite material shows better reinforcing and toughening effects, the mechanical property of the composite material is improved, and the carbon-glass super-hybrid composite material is better than an interlayer hybrid composite material on the whole.

The utility model discloses a moisture-proof vibration-damping airport cable with unshielded control lines, which comprises an inner-layer cable core body formed by twisting seven power cable cores together, a cross-linked fluororubber longitudinal hole insulator, a copper net braided armor layer and a PUR outer sheath are sequentially wrapped outside the inner-layer cable core body, six longitudinal holes are uniformly distributed in the circumferential direction of the cross-linked fluororubber longitudinal hole insulator, and the outer sheath is wrapped outside the copper net braided armor layer and the PUR outer sheath. Each longitudinal hole is internally provided with three or four control wire cores and filled with polypropylene moisture absorption core materials, each power wire core comprises an inner conductor, an alignment type wholly aromatic copolyamide stretched fiber woven separation net, a nylon resin moisture-proof dielectric layer and a thermoplastic polyester insulating layer, and the outer diameter of the PUR outer sheath is 44-48 mm. The airport cable is balanced and stable in cable core structure, high in mechanical strength, better in vibration reduction performance, excellent in moisture-proof and water-blocking characteristics, suitable for laying and installation in a complex underground environment, and better in durability and applicability.

An object is to provide a film having a relatively high tensile modulus of elasticity (Young's modulus) in both a MD direction and a TD direction, having a relatively low heat shrinkage rate in the TD direction, and having relatively excellent uniform stretchability in the TD direction during production. The film contains a propylene-based polymer or a propylene-based polymer composition and satisfies an inequality (I) below and the like. -0.35 < BOMD - BOTD < 1.00 (I) -0.35 < BOMD - BOTD < 1.00 (I) (In the inequality, BOMD represents a degree of orientation in a MD direction of the film measured using a birefringence method, and BOTD represents a degree of orientation in a TD direction of the film measured using the birefringence method.)

The invention relates to the field of automobile parts, and discloses an instrument panel cross beam machining method and an instrument panel cross beam. The instrument panel cross beam machining method adopts an injection molding mode to machine an instrument panel cross beam, and in the injection molding process of the instrument panel cross beam, injection molding is carried out by adopting injection molding parameters of a first injection speed and a first screw rotating speed in a first time period; in the second time period, injection molding parameters of the second injection speed and the second screw rotating speed are adopted for injection molding; wherein the first injection speed is greater than the second injection speed, and the first screw rotation speed is greater than or equal to the second screw rotation speed. Therefore, the distribution of the glass fibers can be optimized only by adjusting the injection molding parameters of the first time period and the second time period, so that the mechanical property of the instrument panel cross beam is improved, and compared with the mode that the content of defects and impurities needs to be accurately controlled in the related technology, the production cost and the production difficulty can be reduced.

The application relates to a multi-phase synergic high-strength high-elasticity polyester elastomer and a preparation method and application thereof, and belongs to the technical field of high polymer material synthesis. The application comprises the following steps: weighing binary acid I, binary alcohol and a hydroxyl-terminated polyether, and performing esterification reaction on terminal carboxyl groups and terminal hydroxyl groups to form an esterification product; polyester oligomers are prepared by performing ester exchange reaction between the terminal hydroxyl groups of the esterification product; caprolactam is added to generate aminocaproic acid by ring-opening reaction, and meanwhile, the aminocaproic acid and part of the polyester oligomers perform esterification reaction to form a multi-component oligomer with terminal amino groups and terminal hydroxyl groups; binary acid II and a solvent are added, and salt formation reaction is performed on the terminal carboxyl groups and the terminal amino groups at low temperature; at high temperature, three forms of polycondensation reactions, i.e., amide bond formation by dehydration of the ammonium salt, ester bond formation by dehydration of the terminal carboxyl groups and the terminal hydroxyl groups, and ester bond formation by dehydration of the binary alcohol between the terminal hydroxyl groups, are synchronously performed to prepare a multi-block polyester elastomer. The hydrogen bond interaction is strengthened, and the tensile strength, tensile modulus and elastic recovery capacity of the elastomer are improved.

The invention belongs to the technical field of materials, particularly relates to a short fiber reinforced EPDM (ethylene-propylene-diene monomer) sheet and a preparation process thereof, and provides the following scheme aiming at the problems of limited tensile property and low tearing strength in the prior art. Comprising the following components in parts by weight: 40-50 parts of ethylene propylene diene monomer, 10-15 parts of modified polyacrylate, 5-10 parts of crayfish shell powder, 15-25 parts of modified reinforced fibers, 5-10 parts of soybean protein and 5-10 parts of an additive, the raw materials of the modified reinforced fibers comprise modified polyamide fibers, polypropylene reticular fibers, aramid nanofibers, graphene oxide and polyether ketone, the solvent is dimethylformamide, the tensile property of the short fiber reinforced EPDM sheet produced from the raw materials is greatly improved, the indexes such as tensile strength, tensile modulus and elongation at break are increased, and the tensile strength of the short fiber reinforced EPDM sheet is improved. And the capability of resisting tearing damage is high.

The application discloses a polyurethane elastomer and a preparation method thereof. Raw materials of the polyurethane elastomer include polymer polyol, diisocyanate and chain extender, etc., wherein the polymer polyol is prepared by condensation reaction or ester exchange reaction of aromatic diacid, ester or anhydride thereof and raw materials such as polyether glycol, the polyurethane elastomer of the application has a molecular structure containing hard segments obtained by reaction of isocyanate and small-molecule polyol chain extender, and soft segments containing ester bond connected aromatic group-polyether glycol block copolymer structure, and can realize the following performances: keeping high mechanical properties (specifically represented by high elastic recovery rate, tensile modulus and breaking strength), and endowing the polyurethane elastomer with excellent hydrolysis resistance, oil resistance, wear resistance and low-temperature flexibility.

The invention relates to a 3k polyacrylonitrile precursor, a high-strength 3k carbon fiber and a preparation method thereof, and belongs to the technical field of carbon fiber production. The preparation method of the 3k polyacrylonitrile precursor comprises the following steps: spraying a spinning stock solution through a 4k spinneret plate by adopting a dry-jet wet spinning method, enabling the spinning stock solution to enter a coagulating bath through an air layer for forming, and then carrying out water washing, water drawing, oiling, drying and steam drawing to prepare the 3k polyacrylonitrile precursor. According to the preparation method, the 3k polyacrylonitrile precursor is prepared by adopting a 4k spinneret plate through a dry-jet wet spinning method, so that the prepared 3k polyacrylonitrile precursor has lower fineness and higher mechanical strength, and correspondingly, the prepared 3k carbon fiber can have excellent mechanical strength.

Blown films based on blends of C2C3 random copolymers and C2-based plastomers combine low seal initiation temperature (SIT), good optical properties and improved hardness / impact balance and also show excellent sterilization properties.

The present application aims to provide a sheet having high transparency, suppression of yellowing caused by heating, and high tensile elastic modulus, and also excellent softness, and a laminate having the sheet. The sheet of the present application contains microfine fibrous cellulose having a fiber width of 10 nm or less, and a cellulose derivative having a weight average molecular weight of 1.0 x 10 4 3.0 x 10 5 the following cellulose derivative.

A resin composition containing a styrene block copolymer, a (meth) acrylic compound, and a polymerization initiator. A laminate provided with a base film and a transparent resin layer disposed on the base film, the transparent resin layer containing at least one substance selected from the group consisting of the resin composition and a cured product thereof. A transparent antenna (110) is provided with a transparent substrate (110a), a conductive member (110b) disposed on the transparent substrate (110a), and a coating member (110c) disposed on the conductive member (110b), and at least one member selected from the group consisting of the transparent substrate (110a) and the coating member (110c) contains a cured product of the resin composition. An image display device (100) is provided with a transparent antenna (110).

The present application provides a negative electrode sheet and a preparation method thereof, a secondary battery having the same, a battery module, a battery pack and an electric device. The negative electrode sheet of the present application comprises a reduced graphene oxide sheet and a modified nano negative electrode material, wherein the modified nano negative electrode material comprises: a core; and a coating layer coated on the surface of the core, wherein the molecular formula of the core is A x B y , wherein A is at least one selected from antimony, molybdenum, and silicon, B is at least one selected from sulfur, selenium, and oxygen, 1≤x≤3, 1≤y≤4, and the coating layer includes polydopamine. The negative electrode sheet of the present application has a high tensile modulus and tensile strength, which can improve the energy density of the secondary battery and extend the cycle life.

The invention discloses a polyacrylonitrile-based high-strength and high-modulus carbon fiber and a preparation method thereof. The tensile strength of the carbon fiber is 3.6 GPa to 7.7 GPa, and the tensile modulus of the carbon fiber is 350 GPa to 700 GPa.

The invention discloses a polymerization method for preparing high-strength and high-model carbon fibers, which mainly comprises the following steps of: polymerizing, solidifying and forming, washing with water, drafting with hot water, oiling, drying and densifying, drafting with steam, heat-setting and collecting the protofilaments according to the preparation of the protofilaments to obtain the finished protofilaments. The method comprises the following steps: S1, polymerization: polymerizing a reaction solution composed of acrylonitrile, a comonomer and a dimethyl sulfoxide solution in two steps; s2, monomer removal and defoaming: separating residual acrylonitrile monomers in the polymerization liquid from a system under a vacuum condition, removing mixed gas in the polymerization liquid, and eliminating bubbles to obtain a stable spinning solution. Compared with the prior art, the polymerization method for preparing the high-strength and high-model carbon fibers has the advantages that the good spinning solution is formed through polymerization, and the tensile strength and the tensile modulus of the carbon fibers are helped to be improved at the same time in cooperation with precursor production conditions.

This invention provides a method for preparing high-elasticity spandex from recycled polyester and the resulting high-elasticity spandex. The method includes the following steps: 1) reacting DMT with a diol with a molecular weight less than 200 to obtain an aromatic polyester diol; 2) reacting the aromatic polyester diol obtained in step 1) with a diisocyanate to obtain a prepolymer; 3) chain-extending the prepolymer to obtain a polyurethane polymer; 4) spinning the polyurethane polymer to obtain high-elasticity spandex. The DMT can be obtained from recycled polyester. This invention uses recycled polyester to prepare DMT, eliminating the need to convert DMT to PTA. The direct reaction of DMT with a diol to prepare the polyester diol makes the reaction conditions for the aromatic polyester diol milder, saves the step of converting DMT to PTA, utilizes recycled materials, and makes the production process more environmentally friendly. Simultaneously, the introduction of aromatic rings increases the tensile modulus of the spandex, giving it better elasticity.

The application discloses a kind of polypropylene composite material and preparation method and application thereof, belong to high polymer material technical field.Polypropylene composite material includes following component according to weight fraction: polypropylene resin 50~80 parts;Chopped carbon fiber 20~40 parts;Polar graft A 3~5 parts;Polar graft B 2~5 parts;Beta nucleating agent 0.05~0.3 parts;Antioxidant 0.2~2 parts;Wherein, the polar graft A is maleic anhydride graft, and the mass grafting rate of maleic anhydride is 0.7~1.3%;Polar graft B is glycidyl methacrylate graft, and the mass grafting rate of glycidyl methacrylate is 0.6-0.8%.The polypropylene composite material of the application can significantly improve the impact performance of the material under the premise of maintaining the mechanical properties of the material, so that the material has high tensile strength, high tensile modulus and high impact strength.

The invention relates to the technical field of composite materials, in particular to a straw-plastic composite material and a preparation method thereof. The invention aims to solve the problems of poor mechanical property and poor water resistance of the existing straw-plastic composite material. Through compounding of the rape straw skin powder, the bamboo sawdust powder and the polymer, the load bearing capacity, the rigidity, the bending strength and the bending resistance of the straw-plastic composite material are remarkably improved; meanwhile, the uniformity and orderliness of the straw-plastic composite are improved, the tensile strength and the tensile modulus are increased, and the tensile property is further improved; by adjusting the ratio of MgO to MgSO4 in the magnesium oxysulfate cement, the addition amount of calcium carbonate and the variety of the coupling agent, the density of the straw-plastic composite material and the compactness of the internal structure are enhanced, and the axial tensile mechanical property of the straw-plastic composite material is further improved; the preparation process and the extrusion molding process are improved, the proportion of the composite foaming agent and the extrusion molding temperature are adjusted, the foam structure of the straw-plastic composite material is optimized, and the prepared straw-plastic composite material has the characteristics of high mechanical property and good water resistance.