16results about How to "Balance rigidity" patented technology

The invention belongs to the technical field of elastic finish paint, and particularly relates to polyurea elastic finish paint as well as a preparation method and application thereof. The polyurea elastic finish paint is prepared from the following raw materials: paint and a curing agent, according to the polyurea elastic finish paint disclosed by the invention, the polyurea resin, the hyperbranched hydroxyl polyester resin and the organic silicon resin form a ternary blended resin system, and the paint vehicle is formed by combining the ternary blended resin system with the wear-resistant filler, the reinforcing filler, the wetting dispersant, the flatting agent, the ultraviolet absorbent, the light stabilizer, the delustering agent and the diluent; the elastic finish paint obtained by mixing and curing the paint vehicle and a flexible aliphatic isocyanate prepolymer has the advantages of good stone crushing resistance, good elasticity, strong stress release capability, high elongation, impact resistance, wear resistance, water resistance, moisture resistance, acid and alkali resistance, salt mist resistance, good weather resistance and the like.

The invention aims to provide a preparation method and application of a CMC / PVA active packaging film coated with chitosan-tannic acid on the surface, and belongs to the field of food preservation. Comprising the following steps: firstly, preparing a CP40 film, and then preparing a CP40 / CT% composite film: preparing a chitosan solution with the mass concentration of 1%, adding tannic acid TA into the chitosan solution, stirring for 30 minutes in a shading manner at room temperature to form a CT coating solution, flatly laying the prepared CP40 film on a planar carrier, coating the surface of a substrate film with the CT coating solution, and putting the composite film and the carrier into a drying oven at 45 DEG C for constant-temperature drying, so as to obtain the CP40 / CT% composite film. And after the solvent of the coating layer is completely volatilized, taking out and stripping to obtain the CP40 / CT% composite film. Under the action of hydrogen bonds and electrostatic attraction, a compact network structure of an amorphous-weak crystal region is formed in the composite film, so that the interface bonding strength of the film is enhanced, and the rigidity and flexibility of the film are balanced. The physical and chemical properties and biological activity of the composite membrane are synergistically optimized, and the composite membrane has obvious degradation signs after being buried in soil for 35 days and belongs to a biodegradable material.

The invention relates to injectable cross-linked collagen gel and a preparation method thereof. Two crosslinking strategies of self-crosslinking and crosslinking agent crosslinking are fused together for the first time, and two types of amido bonds, namely amido bonds of a collagen-collagen structure (A) and amido bonds of a collagen-fatty amine-collagen structure (B), are respectively constructed through two crosslinking paths, namely catalysis of collagen polypeptide self-crosslinking and catalysis of fatty amine crosslinking, so that a hard / soft dual crosslinking network is obtained. The relative proportion of the structure A and the structure B in the final product is adjusted through a proper cross-linking process, so that the strength and the stability of the final product are adjusted and controlled, and the use requirements of different injection parts can be met.

The utility model provides a kind of power battery multi-module folding type welding cold plate structure, it is related to new energy battery technical field, including module cold plate assembly, first module cold plate and second module cold plate, the both sides of module cold plate assembly are equipped with edge, the front of edge is equipped with water outlet, the back of edge is equipped with water inlet, the end of water inlet and water outlet is equipped with sealing ring, the outside of module cold plate assembly includes cold plate outer wall, power battery multi-module folding type welding cold plate structure is designed by three kinds of assembly forms of module cold plate assembly, and the cooling demand of different battery module can be flexibly adapted. In the first form, first module cold plate and second module cold plate are integrated by welding and form sealing, internal S-shaped support septum is connected to form limiting step, provide high rigid support, suitable for high-strength battery module scene;The flexible of the second form of partition type design and reserved gap is enhanced, and the large deformation caused by cell expansion is adapted.

The application belongs to the technical field of pipe materials, and relates to a high-temperature-resistant and high-wear-resistant pipe and a preparation method thereof. The high-temperature-resistant and high-wear-resistant pipe is a composite pipe with double-layer materials, which is composed of a POK inner pipe as an inner layer and a PE outer pipe as an outer layer. The POK inner pipe as the inner layer is obtained by extruding and shaping POK material after melt blending of POK resin, toughening agent, ABS cooling agent, antioxidant and lubricant at a temperature range of 200-240 DEG C. The PE outer pipe as the outer layer is obtained by extruding and shaping PE material after melt blending of PE resin, antioxidant and lubricant at a temperature range of 170-210 DEG C. The PE pipe as the outer layer tightly wraps the POK pipe as the inner layer, and the POK inner pipe as the inner layer and the PE outer pipe as the outer layer are tightly attached. Compared with the prior art, the application has the advantages of excellent high-temperature-resistant and high-wear-resistant performance, anti-aging performance and high-impact resistance, and low production cost.

This invention provides a high-hardness, scratch-resistant, water-based two-component polyurethane matte black base coat, its preparation method, and its application. The two-component matte black base coat comprises component A and component B. Component A includes a water-based hydroxyl polyurethane acrylic dispersion, a water-based hydroxyl acrylic dispersion, hydroxyl microspheres, a high-pigment carbon black paste, water-based additives, a film-forming aid, and water. Component B includes a curing agent and a diluent. The matte black base coat of this invention exhibits high hardness, scratch resistance, and chemical resistance. It also demonstrates excellent workability, activation period, and surface finish, making it suitable for water-based two-component matte black base coat systems. It is particularly suitable for decorative and protective applications in the plastic paint industry, such as 3C consumer electronics, where extremely stringent requirements for abrasion resistance, scratch resistance, and chemical resistance are necessary.

This invention relates to the field of polymer materials technology, specifically disclosing an epoxy resin potting compound and its preparation method. The epoxy resin potting compound comprises the following raw materials: 40-50 parts of epoxy resin matrix, 8-12 parts of reactive diluent, 3-6 parts of core-shell toughening agent, 40-45 parts of nanofiller, 12-16 parts of curing agent, and 1-1.5 parts of curing accelerator. The preparation method includes: S1, mixing and stirring the epoxy resin matrix, reactive diluent, core-shell toughening agent, and nanofiller until homogeneous to obtain a mixture; S2, adding the curing agent and curing accelerator to the mixture and continuing to stir until homogeneous to obtain the epoxy resin potting compound. The epoxy resin potting compound prepared by this invention exhibits excellent impact resistance, weather resistance, and salt spray corrosion resistance, while maintaining good tensile strength and electrical insulation properties, significantly improving the reliability and service life of electronic component packaging.

The utility model provides an elastic sheet structure for a connector. The elastic sheet structure comprises a metal-sheet-shaped base body; the base body is provided with a first bent part, a second bent part, a third bent part, a fourth bent part and a fifth bent part which are sequentially arranged in the length direction. The first bending part is bent to form a semicircle, the semicircle part of the first bending part is provided with a stress buffer hole, and the tail end of the fifth bending part is provided with an arc-shaped contact salient point; a guide channel with an opening gradually reduced from outside to inside is formed between the fifth bending part and the base body, and the fifth bending part forms a guide inclined plane; and the fifth bending part is used for being elastically plugged with an external connector. According to the utility model, the problems of stress concentration, unstable contact, easy deformation, infirm installation and the like of a traditional elastic sheet structure are solved, the combination of high reliability, long service life and low-cost manufacturing is realized, and the elastic sheet is suitable for the field of precision electronic connectors.

The invention relates to the technical field of medical polymer materials, and particularly discloses a nylon material for a medical catheter as well as a preparation method and application of the nylon material. The nylon material for the medical catheter is mainly prepared from the following raw materials in percentage by weight: 80-90% of nylon resin, 8-12% of organic grafted SEBS (Styrene-Ethylene-Butylene-Styrene) and 2-8% of an anticoagulant, the nylon resin is selected from nylon 12 and nylon 6, and the weight ratio of the nylon 12 to the nylon 6 is (6-8): (2-4); the organic grafted SEBS is obtained by treating SEBS resin by adopting maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid and hydroxyethyl methylacrylate. Through mutual cooperation of the raw materials, the nylon material has the advantages of high tensile strength, high elongation at break, good anticoagulation performance, good platelet adhesion resistance and high biological safety, achieves balance in mechanical properties, blood compatibility and biological safety, and meets the requirements of medical catheters.

The present invention belongs to the technical field of polymer films, and specifically relates to a biodegradable wrapping film and a preparation method thereof. The biodegradable wrapping film comprises the following components: 70-85 parts of PBAT, 10-30 parts of polylactic acid, 5-10 parts of polypropylene carbonate, 10-15 parts of toughening agent, 5-15 parts of plasticizer, 1-2 parts of light stabilizer, and 0.1-0.3 parts of antioxidant; wherein the toughening agent is prepared by reacting phenylalanine, tyrosine and gum arabic. The preparation method is to prepare the toughening agent in advance; stir PBAT, polylactic acid, polypropylene carbonate, plasticizer and antioxidant once, continue to add toughening agent and light stabilizer for secondary stirring, and then prepare the biodegradable wrapping film by extrusion granulation and cast film. The present invention improves the stretchability and tensile strength of the biodegradable wrapping film based on PBAT by adding a homemade toughening agent, and at the same time, by granulation and one-time cast extrusion film making, the preparation method is simple to operate, low cost, and suitable for large-scale production.

The invention relates to the technical field of composite materials, and in particular to a composite plastic based on a PPO material and a preparation method thereof. The invention uses a polyphenylene ether having a chain-branched triazine group and polyvinyl chloride modified by a long-chain fatty acid ester as raw materials for blending, and can prepare a composite plastic with good thermal stability and plasticity; the triazine group is chain-branched on the polyphenylene ether side chain, and can significantly improve the thermal stability of the polyphenylene ether; the triazine group has excellent heat resistance and can maintain structural stability at high temperatures, so that the modified polyphenylene ether has a higher use temperature range; the introduction of the long-chain fatty acid ester can further improve the performance of the polyvinyl chloride at high temperatures; the prepared composite plastic can have good thermal stability through the combination of the two; the flexible characteristics of the long-chain fatty acid ester can adjust the toughness of the composite plastic, and combined with the rigidity of the modified polyphenylene ether, the rigidity and toughness of the composite plastic can be better balanced.

This invention provides a carboxyl-terminated modified polyamide toughening agent, its preparation method, and its application. The carboxyl-terminated modified polyamide toughening agent comprises the following components in parts by weight: 55-70 parts of dimer acid, 5-12 parts of aliphatic diamine, 5-15 parts of aromatic dicarboxylic acid, 2-8 parts of modified monomer, 0.1-0.5 parts of catalyst, and 0.2-1 parts of antioxidant. The carboxyl-terminated modified polyamide toughening agent obtained by this invention, when applied to powder coatings, exhibits good flexibility and impact strength, achieving a balance between flexibility and rigidity; it has good boiling water resistance, without defects such as blistering, peeling, discoloration, or loss of gloss; and it has good solvent resistance, resulting in a high gloss retention rate for the coating.

The invention belongs to the technical field of polyurethane resins, and specifically relates to a method for preparing a thermoplastic carbon fiber sizing agent waterborne polyurethane resin and an application thereof, comprising the following steps: (1) preparing a prepolymer: mixing 72-76 parts of polyester polyol and 20-24 parts of isocyanate, reacting, continuously adding 13-16 parts of dihydroxymethylpropionic acid, 6-9 parts of 1,4-dihydroxy-2,2-dimethylpiperazine and 40-50 parts of acetone, reacting, adding 1-3 parts of triethylamine, reacting for 5-10 minutes, and then adding 2-4 parts of sodium ethylenediamine sulfonate to obtain a prepolymer; (2) emulsifying: transferring the prepolymer to an emulsifier, adding 280-300 parts of an ice-water mixture, stirring, adding 6-8 parts of an ethylenediamine aqueous solution with a mass fraction of 18-20%, standing for 20-24 hours, removing the acetone, adding a film-forming aid, a wetting agent, a defoaming agent and a lubricant, stirring evenly, and obtaining a waterborne polyurethane resin.

The present invention aims to provide a polyphenylene ether-based resin composition which is excellent in heat aging resistance in the vicinity of 110°C to 140°C, and has a balance of rigidity and toughness and a good molded appearance. The polyphenylene ether-based resin composition of the present invention is characterized in that it contains a polyphenylene ether (A), an antioxidant (C), a metal oxide and / or a metal sulfide (D), and a lubricant (E), and optionally a styrene-based resin (B), and the mass ratio of each component is: the (A) component 10 to 95 mass parts, the (B) component 0 to 80 mass parts, the (C) component 0.05 to 3 mass parts, the total of the (D) component and the (E) component 0.1 to 3.5 mass parts, and the mass ratio of the (D) component to the (E) component is (D) component / (E) component = 80 / 20 to 55 / 45, with respect to the total of 100 mass parts of the above-mentioned (A) component, the above-mentioned (B) component, the above-mentioned (C) component, the above-mentioned (D) component, and the above-mentioned (E) component.

The present invention provides a high heat-resistant and high-barrier PA6 / COC composite material and a preparation method thereof, wherein the PA6 / COC composite material comprises the following components by weight: 65-80 parts of PA6; 15-25 parts of COC; 6-10 parts of modified filler; 0.5-1.5 parts of nucleating agent; 4-8 parts of toughening agent; 0.5-2 parts of lubricant; 0.2-1.0 parts of antioxidant. The present invention adopts high-viscosity PA6 as the first matrix resin and COC as the second matrix resin, improves the solvent resistance of PA6 by COC, adds a nucleating agent to improve the crystallinity of the alloy material, further improves the rigidity, heat resistance, solvent resistance and barrier properties of the material, and adopts an appropriate toughening agent and lubricant system to balance the rigidity, toughness and processing properties of the material, so that the finally prepared PA6 / COC composite material has high heat resistance, excellent solvent resistance and good barrier properties.

The invention provides a tire design method with low in-vehicle sound, which belongs to the technical field of tire design and comprises the following steps: step 1, acquiring tire noise parameters of an initial tire of a low vehicle during driving, and determining noise attributes and a noise curve; step 2, selecting optimal material molecules of the tread according to noise attributes, and determining a running speed-noise excitation curve of a low vehicle according to a noise curve; 3, determining a tire stress area and a tire rigidity parameter; 4, determining design quality parameters and sidewall structure parameters of the tire according to the stress area of the tire and the rigidity parameters of the tire; and 5, designing the tire according to the optimal material molecules, the design quality parameters of the tire and the sidewall structure parameters. The problems that tread materials cannot be selected according to actual vehicle tire noise attributes and curves, the noise transmission rate of the tire cannot be reduced, noise in a vehicle cannot be improved, meanwhile, only the vehicle speed of the tire is concerned, the performance of the tire at different vehicle speeds is not considered, and the rigidity of the tread and the rigidity of the tire side cannot be balanced are solved.