162results about How to "Fully crosslinked" patented technology

The invention discloses an insulating and sheathing material of ultraviolet light crosslinking expanding type phosphorus nitrogen flaming resistance polyolefine cables and a preparation method thereof. The invention is characterized in that polyethylene/PEMA and/or ethylene vinyl acetate or maleic anhydride grafted ethylene vinyl acetate or acid amide grafted ethylene vinyl acetate copolymer are taken as base, added with expanding type phosphorus nitrogen halogen-free flame retardants, light trigger, polyfunctional group cross linker and chemical inhibitor and matched with flaming retardant synergistic agent, antismoke agent and processing aid, and then squeezed out and pelleted into photo-crosslinking flame retardant cable materials; and then the flame retardant cable materials are melted and extruded on a cable conductor wire core and clad into an insulating layer and a sheathing layer; hereupon the ultraviolet light irradiation crosslinking is carried on the insulating layer or the sheathing layer. Via detecting, the oxygen index of the insulating layer or the sheathing layer is larger than 30%, the vertical flaming experiment passes through UL-94 V0 level, the tensile strength is larger than 12Mpa, the elongation at break is larger than 350%, and the electric volume resistivity is larger than 8*10 omega.cm.

The invention discloses a modified starch adhesive and a method for preparing the same. The modified starch adhesive comprises the following components by weight: 30-50 parts of corn starch, 80-120 parts of deionized water, 25-40 parts of sodium hypochlorite solution, 0.5-2 parts of epichlorohydrin, 30-70 parts of polyvinyl acetate emulsion, 10-30 parts of epoxy resin, 2-7 parts of tertiary amine catalyst, 5-15 parts of filler, 0.2-1 part of surfactant, and 0.2-0.6 part of preservative, wherein the sodium hypochlorite solution serves as the oxidant, the polyvinyl acetate emulsion serves as the high-cohesive-energy reinforcement component, and the epoxy resin servers as the water-tolerant modified component. The method for preparing the modified starch adhesive comprises the following steps: mixing the oxidized starch emulsion prepared in advance, the polyvinyl acetate emulsion and the epoxy resin according to proportion uniformly, adding the catalyst, the filler and the preservative, and stirring quickly and uniformly. The modified starch adhesive disclosed by the invention has the advantages of high shear strength, high water-tolerant shear strength, moderate viscosity, good liquidity, moderate primary drying time, low cost and excellent integrated performance.

The invention provides a composite material prepreg for quickly ultraviolet light curing a resin base structure reinforced by glass fibers with certain thickness and a preparation method thereof. In the method, a common free radical curing resin as a matrix, a proper photoinitiator, a thermal initiator and other assistants are preferably selected to form a light-thermal composite initiation system, a glass fiber textile is used as a reinforcement material, and the composite material prepreg with a certain thickness is prepared by a proper compound process. The prepreg can be cured by irradiating ultraviolet light on a single surface for 10 minutes, and the light curing thickness at one time can be higher than 15 mm. By adopting the invention, the existing technical problem that the ultraviolet light cannot be used for curing composite material structural members with large thicknesses (10-15 mm and larger) at one time is solved, the composite material prepreg is cured more conveniently and efficiently. The light-cured resin and the composite material thereof express huge application prospect and market potential in some special fields, for example, trenchless repair of municipal drainage pipelines.

The invention relates to a method for preparing superfine phenolic fibre, comprising the following steps of: firstly, preparing commercially available soluble phenolic resin with low molecular weight (Mw)of 500-3000 into organic solution containing 10-40wt% of soluble phenolic resin; secondly, adding high molecular weight linear polymer into the solution and stirring until the high molecular weight linear polymer is completely dissolved, wherein mass ratio of the high molecular weight linear polymer to the soluble phenolic resin is 1: (20-100); and thirdly, carrying out electrostatic spinning on the solution to obtain the superfine phenolic fibre and a phenolic fiber felt, wherein relative humidity RH of an electrostatic spinning experiment is 15-55%, and the obtained superfine phenolic fibres can be cylindrical, elliptic cylinder-shaped and belt-shaped. Aiming at the characteristic that low-molecular-weight phenolic resin can be easily melted, the invention provides a non-constant-speed stepped heating and curing process, and curing time is shortened under the condition that the fibers are fully crosslinked and are not melted.

The invention relates to a method for preparing polyacrylonitrile carbon fiber with gamma ray irradiation. The method comprises the following steps: carrying out appropriate doses of gamma ray irradiation for polyacrylonitrile fiber in air, vacuum or inert atmosphere, and thus generating part of cyclization and crosslinking structure; carrying out thermal oxidation stabilization for 0-100 min in air atmosphere to achieve full cyclization and crosslinking; carrying out low-temperature carbonization and high-temperature carbonization so as to prepare the high-performance carbon fiber. The method carries out pre-irradiation treatment before thermal stabilization, so that the thermal stabilization time can be shortened, the production efficiency can be improved, and polyacrylonitrile molecules can form a rigid structure with a regular structure and strong heat resistance. Higher rigid drafting can be applied in the thermal stabilization process, the orientation degree graphite-like sheets in the carbon fiber is facilitated, and the high-performance carbon fiber is prepared.

The invention relates to a carboxymethyl chitosan microsphere embolization agent. The embolization agent takes carboxymethyl chitosan as raw materials; the carboxymethyl chitosan is subjected to pretreatment, emulsification, cross-linking and dehydration drying to prepare microspheres with three-dimensional network structures. After the microspheres absorb water, the microspheres are smooth in surface and are rich in elasticity, have good biocompatibility and biodegradablity and is suitable for non-permanent vascular embolization.

The invention particularly provides a visible-light-quick-curing vinyl ester resin composite prepreg, and a preparation method and application method thereof, belonging to the field of repair of a fiber-reinforced resin-base structure with certain thickness. A special vinyl ester resin is used as a matrix; the proper visible light initiator, thermal initiator and other aids are selected to constitute the light-thermal composite initiation system; magnesium oxide is used as a thickener; different types of fabrics are selected as fiber-reinforcing materials according to performance requirements; and a proper composite technique is utilized to prepare the composite prepreg with certain thickness. The visible-light-curing prepreg material can be cured within 5 minutes under the single-side irradiation of visible light, and the once-time photocuring thickness can reach 10mm or above, thereby basically solving the problems of poor operability, poor safety and insufficient film thickness under ultraviolet light. The visible-light-curing prepreg can be subjected to mass application in the field of structure repair.

The present invention provides a curable resin composition for coating natural or artificial nails, which in particular exhibits an excellent appearance after coating, high water and scratch resistances, and low levels of odor, damage to nails, and dermal irritancy, resulting in a high level of safety to human bodies and superior storage stability. The curable resin composition for coating a natural or artificial nail of the present invention comprises (A) an aqueous emulsion of a polymer having functional groups polymerizable by exposure to active energy radiation, (B) polyethylene glycol, and (C) a photo radical initiator containing no nitrogen atom in its molecule.

The invention provides a positive temperature coefficient material. The material is formed by melting a mixture, and the mixture comprises a polymer, a conductive filler, a nucleating agent, an additive, a flame retardant and a lubricant; through considering the total weight of a mixture as a reference, the components by weight percent are 0.5 to 10 wt% additive, 5 to 15 wt% polymer, 0.5 to 10 wt% nucleating agent, and 0.5 to 3 wt% lubricant, 80 to 90 wt% conductive filling material, and 1 to 6 wt% flame retardant; the additive is ethylene-propylene-diene rubber; the conductive filling material is titanate modified conductive filling material; and the flame retardant is titanate modified flame retardant. The invention further provides a preparation method of the material and a thermistor containing the material. The positive temperature coefficient material has good ageing-resistance and pressure resistant and current resistance.

The invention discloses a composite film with a stable friction coefficient and which can be coded. It includes an outer layer, a barrier layer and a polyethylene co-extrusion film layer from the outside to the inside, and the polyethylene co-extrusion film layer includes a corona treatment layer from the outside to the inside. , a core layer and a heat-sealing layer. The material composition of the heat-sealing layer mainly includes polyethylene resin and a slip agent. The slip agent is a silicone slip agent masterbatch with polyethylene as a carrier. In the present invention, silicone slippery agent is added to the polyethylene co-extrusion film heat-sealing layer located inside the film, and it is extruded to the surface and evenly distributed during processing by utilizing its incompatibility with the main material to achieve The purpose of reducing the friction coefficient, and the molecular weight is large. Under the high temperature conditions during the film aging, storage and use, the silicone resin with low surface energy will not migrate and precipitate, and improve the stability of the friction coefficient of the inner surface of the film. Unwinding The speed meets the requirements of high-speed packaging machines. The invention discloses a method for preparing a composite film suitable for stable friction coefficient and capable of coding.

The invention relates to chitosan microspheres. The microspheres are solid spheres which have smooth surface and uniform granularity and are formed by crosslinking of chitosan and a crosslinking agent, wherein the grain diameter of each microsphere is 50-1200 mu m, preferably 50-600mu m, and further preferably 150-300mu m; and the grain diameter difference is not more than 20 percent, and preferably not more than 10 percent. The microspheres provided by the invention have the characteristics of small grain diameters and high uniformity, and are capable of improving the safety effectiveness of embolism in interventional therapy, reinforcing the clinical operability, reducing the clinical safety accident rate and reducing the production cost.

The present invention relates to a good caking property two-component hollow glass silicone sealant which is prepared by mixing A and B components, the weight ratio of A and B components is 10 ~ : 1; an adhesion promoter is added into the B component, the adhesion promoter comprises KH550, KH560, KH602 and KH792, the four components are mixedly placed for cross-linking, the calculated weight ratio of KH550: KH560 is 2: 1, the calculated weight ratio of KH602: KH792 is 1: 1, and the calculated weight ratio of KH550: KH602 is 5-6: 1. The silicone rubber two-component sealant uses the bran-new adhesion promoter to overcome the disadvantages of single use of KH550 and KH560, inherits the dual advantages of good adhesion and process performance stability, and has excellent overall performance.

The invention relates to an environment-friendly plastic foamed sheet with antistatic and flame-retardant functions and a manufacturing technique thereof. The manufacturing technique comprises the following steps: preparing bamboo carbon powder, kaolin, plastic, antistatic agent, flame retardant and other chemical assistants, banburying, mixing, discharging from a guillotine to obtain a sheet semi-finished product, and foaming to form with a foaming machine. The plastic foamed sheet is prepared from the following raw materials in parts by mass: 5.5-6 parts of plastic, 1.0-1.5 parts of bamboo carbon powder, 1.5-3.5 parts of kaolin, 1.0-2.5 parts of antistatic agent, 1.5-3.5 parts of flame retardant and 0.5-1.0 part of chemical assistants. The manufacturing technique produces the plastic foamed sheet with high-standard antistatic and flame-retardant functions, overcomes the defects and shortcomings in the prior art, has important and profound significance for solving the problems above, and has very wide market potential.

The invention provides a thermosetting type IMD film and a preparation method thereof. The IMD film comprises a PET (polyester) base film, wherein an anti-scraping coating layer is arranged on the upper surface of the PET base film; a film layer is arranged on the anti-scraping coating layer; an ink adhesion layer is arranged on the lower surface of the PET base film; the film layer is arranged on the ink adhesion layer; and the anti-scraping coating layer is a thermosetting coating layer. The preparation method comprises the following steps of performing corona on the PET base film; coating the PET base film; drying the coated PET base film; drying and curing the dried PET base film; coating the ink adhesion layer on the back of the thermoset PET base film; and drying and curing the PET base film of which the back is coated with the ink adhesion layer, coating the film on the two surfaces, and curing, rolling and cutting the film. The thermosetting type IMD film has the characteristics of high transmittance, flexibility and adhesion. The process of strengthening the coating is a progressive temperature raising process, the cross-linking of the coating is fuller, and the requirements of high transmittance, flexibility and adhesion are met.

The invention discloses a composite packaging adhesive film for a solar packaging material. The composite packaging adhesive film is composed of an ethylene vinyl acetate (EVA) adhesive film layer anda polyolefin elastomer (POE) adhesive film layer, and the EVA adhesive film layer is prepared from the following raw materials in parts by weight: 100 parts of EVA resin, 0.5-1.6 parts of a compositecross-linking agent, 0.5-1 part of a co-crosslinking agent, 0.05-0.2 part of an ultraviolet absorbent, 0.03-0.1 part of an antioxidant and 0.1-0.5 part of a tackifier, wherein the composite cross-linking agent comprises a peroxide and an crosslinking control agent. The invention further discloses a preparation method of the composite packaging adhesive film for the solar packaging material, and the preparation method comprises the following steps: melt extrusion of POE resin, melt extrusion of EVA resin and co-extrusion. According to the composite packaging adhesive film disclosed by the invention, the problems of bubbles and too low gel content of a cured film are solved, and meanwhile, the composite packaging adhesive film has the characteristics of good light transmittance and high glass strength. The preparation method can meet the requirements of process stability, laminating process stability and cross-linking curing efficiency during film preparation by casting at a same time.

The invention relates to a method for preparing a reverse osmosis membrane by utilizing ethyl silicate as an oil-phase cosolvent. The method comprises the following steps: infiltrating a supporting film into a water-phase solution to sufficiently infiltrate the supporting film by the water-phase solution; infiltrating the film into an Isopar G solution containing the ethyl silicate and trimesoyl chloride to initiate interfacial polymerization to form an aromatic polyamide separation layer; and performing thermal treatment on the film at 70-90 DEG C to obtain the aromatic polyamide composite reverse osmosis membrane. The method provided by the invention has a simple preparation process and low costs, and is easy to implement, and the prepared aromatic polyamide composite reverse osmosis membrane has high flux of >=3L*m<-2>*h<-1>*bar<-1> and a high rejection rate of >=99.00%; and in addition, the method can also provide reference for preparation of other high-performance aromatic polyamide composite separation membranes.

The invention discloses a method for preparing a graphene-based biodegradable composite film used in parks. The method comprises the following steps: compounding graphene oxide twice so as to comprehensively transforming a film in a graphene manner, adding the following components into 50-100 parts by weight of a caprolactam phenylsulfonic acid ionic liquids: 10-20 parts of refined starch, 20-30 parts of cellulose and 5-10 parts of graphene oxide suspension, and further dropping 30-40 parts of a polylactic acid solution which is dissolved in chloroform so as to obtain a film material. The film material has the advantages of good mechanical property, high thermal stability, high degradability, good biocompatibility and the like, and can be used in the field of parks.

The invention provides a high-hydrophobicity fluorocarbon composition as well as a preparation method and application thereof, and belongs to the technical field of polymer insulating materials. The high-hydrophobicity fluorocarbon composition is prepared from the following raw materials in parts by weight: 60 parts of fluorocarbon resin; 10 to 25 parts of a reinforcing filler; 50 to 100 parts ofan inorganic flame retardant; 0.2-1 part of a dispersing agent; 12-20 parts of curing agent. The composition can resist electric corrosion and high-temperature damage caused by the electric corrosion,has high hydrophobicity, excellent tracking resistance and flame retardance compared with common silicone rubber coating, and can expand the application field of fluorocarbon coating in the aspect ofelectrical equipment insulation, so that the high-hydrophobicity fluorocarbon composition has a good practical application value.

The invention discloses a thermoplastic dynamic vulcanized brominated butyl rubber/polypropylene composition and a preparation method thereof. The thermoplastic dynamic vulcanized brominated butyl rubber/polypropylene composition is prepared from brominated butyl rubber, polypropylene, dialkyl peroxide, peroxyacidester, N,N-m-phenylenedimaleimide, rubber softening oil and a scorch retarder. The preparation method comprises the following steps: 1) performing internal mixing smelting on the brominated butyl rubber, polypropylene and rubber softening oil; 2) further adding a vulcanizing agent, and uniformly mixing; 3) transferring the commixture obtained in the step 2) into a single screw extruder, and performing extrusion pelleting; 4) transferring the commixture obtained in the step 3) into a parallel intermeshing co-rotating twin screw, performing dynamic vulcanization, and performing extrusion pelleting. The thermoplastic dynamic vulcanized brominated butyl rubber/polypropylene composition disclosed by the invention is good in air tightness and barrier property, excellent in mechanical property, feasible in direct injection molding, simple in production process, high in production efficiency, low in cost and easy to popularize and use.

The invention relates to a radiation-crosslinking flame retardant polyolefin material for a car thin-wall electric wire and a preparation method of the material. The radiation-crosslinking flame retardant polyolefin material for the car thin-wall electric wire is formed by extruding through an extruder after mixing and mulling the materials including ethylene-propylene copolymer resin, ethylene vinyl acetate resin, cyanoacrylate rubber, a flame retardant, an antioxidant, a cross-linking agent, a beta ray-resistant degradation agent, a lubricant and the like through a muller. The car thin-wall electric wire which is manufactured by the radiation-crosslinking flame retardant polyolefin material has high temperature resistance and low temperature resistance, is unlimited in applicable range, has better aging resistance, scraping resistance and processing performance, and is quick in extruding speed, so that the requirements of the car thin-wall electric wire with a temperature-resistant level of 125 DEG C can be satisfied. Moreover, the radiation-crosslinking flame retardant polyolefin material can be used as the material for manufacturing the car thin-wall electric wire with a higher temperature-resistant level (125 DEG C).