37results about How to "Improve application features" patented technology

The invention discloses an ultra-high molecular weight polyethylene ultrafine fiber. The invention is characterized in that the ultra-high molecular weight polyethylene ultrafine fiber is prepared from polyethylene with the molecular weight of more than 1 million, and the diameter of the ultrafine fiber is 80 nanometers-2 micrometers. The preparation method comprises the following steps: adding 0.1-5 wt% polyethylene with the molecular weight of more than 1 million and 0.005-2 wt% antioxidant into a corresponding solvent to prepare a polyethylene spinning liquid at 130-180 DEG C; and carrying out ultrasonic processing on the prepared spinning liquid, spinning into an extractant under certain electrostatic spinning conditions to obtain a jelly fiber, and storing the jelly fiber in the extractant for 1-5 days until the solvent in the fiber is leached out, thereby obtaining the ultra-high molecular weight polyethylene ultrafine fiber of which the diameter is 80 nanometers-2 micrometers.

The invention relates to a low-attenuation high temperature resistance optical fiber which comprises a silica fiber. An inner coating and an outer coating wraps the outer surface of the silica fiber from inside to outside in sequence. The low-attenuation high temperature resistance optical fiber is characterized in that the inner coating is made of modified silicone rubber coating materials, the outer coating is made of polyimide coating materials, the inner coating and the outer coating are both formed through thermal curing, and the thickness of the radial single edge of each coating is 16-25microns. According the low-attenuation high temperature resistance optical fiber, the inner coating is small in modulus, high in tensile strength and capable of playing a good buffering role, effectively protecting the silica fiber, improving the mechanical properties of the silicon fiber and optimizing the transmission characteristics of the optical fiber; by means of the recombination of the inner high temperature resistance coating and the outer high-temperature resistance coating, the silica fiber is made to be work normally and maintain low attenuation in environments with 300DEG C high temperature, and thus the application characteristics of the silicon fiber are improved greatly, the silicon fiber can be applied to high-temperature severe working environments, the long-period using temperature reaches 300DEG C, and thus the application field of the silica fiber is expanded; the low-attenuation high temperature resistance optical fiber is simple in coating structure and easy and convenient to manufacture.

A preformed sheet device comprising: (a) less than 10% of a polysaccharide mixture consisting of: (i) red algae polysaccharide; (ii) mannose-containing polysaccharide selected from the group consisting of Mannan, glucomannan, and derivatives or mixtures thereof, and; (iii) fermented polysaccharides, or derivatives thereof; and (b) from about 30% to about 99.5% water; wherein the device contained The total amount of polysaccharides is less than 10%. The preformed sheet device of the present invention is suitable for topical application and exhibits a desired amount of syneresis and/or improved mechanical properties such as strength and elasticity, and exhibits excellent moisturizing, hydrating and cooling effects Beneficial effect. In addition, the device of the present invention is easy to handle when applied, has permeability, and can conform to the contour of the applied surface.

The invention discloses a compensator used in a concentrated-heating hot water network, and concretely relates to a PE (poly ethylene) corrugated compensator for high-temperature water. The compensator comprises an operating tube compensator and an outer polyethylene sleeve, wherein the operating tube compensator is externally sleeved with a hard thermal insulation layer and a soft thermal insulation layer, the outer polyethylene sleeve is tightly wrapped on the outsides of the hard thermal insulation layer and the soft thermal insulation layer, and the hard thermal insulation layer is tightly wrapped on one end of the operating tube compensator and raised parts; the soft thermal insulation layer is tightly wrapped on the other end of the operating tube compensator; and the outer edge of the soft thermal insulation layer is provided with a corrugated pipe. The compensator disclosed by the invention is extremely compact in structure; the compensator is strong in bearing capacity, has the characteristics of acid, alkali and chloride ion corrosion resistance, and prevents the rupturing of an outer pipe in the process that an operating tube is drawn, thereby prolonging the service life of the compensator and saving energy; meanwhile, because of the setting of a protective cover, the heat preservation effect can be further increased; due to the selection of materials, the compensator is more practical; and because of the simple structure and process, the installation process is easier, thereby solving the problem of inconvenience in installation.

The invention discloses a method for preparing ultraviolet excited or vacuum ultraviolet excited green emitting phosphor. The method comprises the following steps of: weighing Al2O3, MgO, Tb3O4 and CeO2 in a mass ratio, sieving all raw materials by using a 100-mesh sieve, mixing by a dry method, introducing one or more of BaCO3, MgCl2, AlF3, MgF2, BaF2 and H3BO3 into the uniformly mixed raw materials, and fully mixing; loading the mixed powder into an alumina crucible; firing at high temperature at reducing atmosphere; crushing the fired fluorescent powder blocks, and sieving by using the 100-mesh sieve; dispersing by a wet method to obtain slurry; controlling the particle size to be 2 to 12 mu m; sieving the slurry which is obtained by wet-method dispersing by using a 500-mesh sieve; removing the sieving residues on the 500-mesh sieve; washing with water; and suction-filtering, drying and screening to obtain the green emitting phosphor. The green emitting phosphor has the characteristics of controllable particle size, high brightness, light failure, color development and low color bleaching.

The invention provides a polyethylene film adhesion tape and a preparation method thereof. A polyethylene film and adhesive are compounded to form the polyethylene film adhesive tape. The polyethylene film adhesion tape and the preparation method have the advantages that processing technology is simple and convenient, performances of a product are excellent, and the product is remarkably superior to a teflon film and a polyimide film in terms of price.

The invention discloses an optical fiber and a preparation method thereof and belongs to the optical fiber field. The optical fiber comprises a quartz optical fiber; the outer surface of the quartz optical fiber is coated with an inner coating and an outer coating sequentially from inside to outside. The optical fiber is characterized in that the glass-transition temperature of a coating materialused for the inner coating ranges from -50 DEG C to -70 DEG C, the refractive index of the coating material used for the inner coating ranges from 1.4 to 1.5, and the post-curing elastic modulus of the coating material of the inner coating ranges from 0.3 to 0.5 MPa; the refractive index of a coating material used for the outer coating ranges from 1.5 to 1.6, and the post-curing elastic modulus ofthe coating material used for the outer coating is 800 MPa or more; the coating material used for the inner coating and the coating material used for the outer coating have different refractive indexes; and the inner coating and the outer coating are both formed by means of ultraviolet curing. The optical fiber can satisfy low attenuation performance and good coating performance required by national standards, can be applicable to a low temperature environment of -70 DEG C to -80 DEG C, and therefore, the temperature application range of the optical fiber can be extended; the preparation process of the optical fiber involves the extremely cold-resistant optical fiber coating materials, the drawing process of the optical fiber is improved, and curing time is reduced, and therefore, preparation process time can be shortened, and preparation efficiency is higher. The preparation method is suitable for continuous production in large quantities.

The invention discloses epoxy-based alkene and alkene ether modified rosin phenol resin and a preparation method thereof. The preparation method comprises the following steps: reacting a phenol-sourced reagent and rosin under the acid catalyzing condition to prepare rosin phenol resin acid; adding 100 weight parts of the rosin phenol resin acid prepared in S1 into a solvent B, and heating to 50-150 DEG C; melting the rosin phenol resin, adding 0.2-6 weight parts of an organic alkali ammonium catalyst; dropwise adding epoxy-based alkene and alkene ether raw materials for 0.5-1 hour, regulatingthe temperature to 50-180 DEG C, and stopping reacting when the acid value of the product is not more than 6mg KOH/g; supplementing a solvent B after the reaction is stopped, and adding acid to neutralize the organic alkali ammonium catalyst; rinsing to obtain substrate, and distilling the substrate at reduced pressure at 50-180 DEG C to obtain epoxy-based alkene and alkene ether modified rosin phenol resin. The epoxy-based alkene and alkene ether modified rosin phenol resin have the characteristics of high reaction activity and good tackifying effect.

The method for making nano size chitin is characterized by that it utilizes ultrasonic technique, inversed phase microemulsion technique and sol-gel technique, etc. to synthesize chitin with nano structure. The detection by using transmission electron microscope with a magnification of 10 ten thousand times shows that said product is of network formed from sphere-like particles connected together, the size of said particle and network vein is mainly in 19-50 nm, and the size of more than 97% of particles and network vein is in 100 nm. Said product possesses good biological compatibility, network structure, microbiostatic power and stability.

The invention provides a method for preparing spherical CaAl2O4:Eu,Nd luminescent powder. The method comprises the steps of: preparing an aluminum salt solution which contains Al<3+>, preparing a mixed salt solution which contains Ca<2+>, Eu<3+> and Nd<3+>, mixing an ammonium carbonate salt solution with the aluminum salt solution and the mixed salt solution in a state of stirring to form a reaction system, and performing a reaction at 15-65 DEG C for 10-20 hours to obtain a precipitate; washing the precipitate, drying the washed precipitate, calcining the dried precipitate in a carbon reduction atmosphere at 1250-1450 DEG C for 2-6 hours, and cooling calcined products to obtain the spherical CaAl2O4:Eu,Nd long-lasting luminescent powder. The long-lasting luminescent powder prepared by themethod has purity of 99.99% or above, spherical morphology and good dispersibility, the problems that an existing long-lasting luminescent material has poor fluidity and uneven dispersion in a mediumare solved, and the application characteristics of the long-lasting luminescent material can be greatly improved.

The invention relates to linear low-density polyethylene and a preparation method thereof. The linear low-density polyethylene is composed of, by weight, 50-60 parts of linear low-density polyethylene, 30-40 parts of chlorinated paraffin, 20-26 parts of solid paraffin, 7-11 parts of catalyst, 4-7 parts of dispersant, 1-2 parts of initiator, 2-4 parts of antioxidant, 50-60 parts of deionized waterand 1-3 parts of anti-adhesion agent. The preparation method is low in raw material consumption and production cost, and prepared linear polyethylene copolymer is uniform in composition distribution,high in tensile performance and better in application characteristic.