44results about How to "Reduced spherulite size" patented technology

The invention provides a preparation method for a polyvinylidene fluoride (PVDF) nanometer film with a beta crystal phase, which belongs to the fields of pyroelectric thin film materials and terahertz detection. The preparation method comprises the following steps: dissolving graphene oxide and polyvinylidene fluoride in an organic solvent and carrying out ultrasonic treatment and magnetic stirring so as to obtain a uniformly dispersed film-making solution; standing the film-making solution for defoaming; preparing a wet film by using a spin coating method; and subjecting the film to heat treatment in an atmospheric environment to realize drying and crystallization of the film so as to obtain the polyvinylidene fluoride nanometer film with the beta crystal phase. According to the invention, the content of the beta crystal phase in PVDF is increased by doping of GO and the PVDF nanometer film is prepared by using the spin coating method; the preparation method is simple, is easy to control, has low requirements on equipment and low cost and can realize preparation under common atmospheric conditions; and the prepared PVDF film is uniform and smooth, has good compactness and stable pyroelectric performance and provides powerful support for development of a thin-film pyroelectric terahertz detector.

The invention discloses an anti-impact MPP (molypermalloy powder core) electric protection tube. The anti-impact MPP electric protection tube is prepared from the following raw materials in parts by weight: 90-110 parts of polypropylene, 5-15 parts of ethylene-propylene-diene monomer, 10-25 parts of talcum powder, 3-10 parts of brucite powder, 5-12 parts of modified micro silicon powder, 0.8-2 parts of colouring agent, 5-15 parts of nano mica, 0.5-2 parts of antioxidant, 0.5-2 parts of polytetrafluoroethylene, 10-25 parts of modified shell powder, 5-15 parts of modified hectorite, 5-25 parts of novel organic montmorillonite, 5-18 parts of melamine cyanurate, 10-25 parts of modified crystal whisker, 15-30 parts of long glass fiber, 3-8 parts of expandable graphite and 5-20 parts of intumescent flame retardants. The anti-impact MPP electric protection tube has excellent impact resistance, flame retardance, ageing resistance, cold resistance and heat resistance.

The invention provides a high voltage direct current cable insulation material, which comprises the following components in parts by weight: 100 parts of LDPE (Low-density Polyethylene), 1-2 parts of CPE (Chlorinated Polyethylene), 0.5-1.5 parts of BaTiO3, 0.6-1.5 parts of conductive potassium titanate whisker, 1-2.5 parts of a cross-linking agent, and 0.1-0.5 part of an antioxygen. A semiconductive polyolefin shielding material prepared from the high voltage direct current cable insulation material has the advantages of ultra-smooth surface feature, good physical property and excellent overall performance; electric current is effectively output to form a favorable uniform electric field, and partial discharge or insulation breakdown caused by severe electric field concentration due to surface defects of a semiconductive shielding layer is prevented; ionized charge and injected charge are absorbed in a deep trap, so that charge accumulating in a local area is avoided, space charge accumulation in a cable insulation material is restrained, and electrical conductivity of the cable insulation material is reduced.

The present invention belongs to the preparation method of poly-3-hydroxyalkanate/carbon dioxide-epoxypropane copolymer/starch ternary mixture. The ternary mixture is formed from carbon dioxide epoxypropane copolymer, poly-3-hydroxyalkanate, starch, talcum powder, boron nitride and tetra[beta-(3,5-di-tert-butyl-4- hydroxyphenyl) propanoicacid] pentaerythritol (antioxidant Ky-7910). The said materials are mechanically mixed in high-speed stirring machine, extruded in twin screw extruder machine and granulated. The temp. of melt material is 175-185 deg.C, and the obtained resin of poly-3-hydroxyalkanate/carbon dioxide-epoxypropane copolymer/starch ternary mixture can be used for preparing film, plate material, sheet material and injection-moulded into plastic components.

The invention discloses a graphene-oxide-modified polypropylene composite material which is prepared from graphene-oxide-modified polypropylene, ethylene propylene diene monomer rubber, a butadiene-acrylonitrile copolymer, a silane coupling agent, zinc borate, magnesium hydroxide, pentaerythritol, epoxy soybean oil, tritolyl phosphate, pentaerythritol stearate, yttrium oxide, nano mica powder, talcum powder, silicon micropowder, 1,3,2,4-di(3,4-dimethylbenzylidene)sorbitol, an ethylene-octylene copolymer and 2-hydroxy-4-n-octyloxy diphenyl ketone. The graphene-oxide-modified polypropylene composite material has the advantages of high strength, excellent heat resistance, excellent flame retardancy and favorable heat stability.

The invention relates to a modified polyester raw material of a low-strength low-elongation terylene filament, which comprises the raw material components as follows: terephthalic acid, ethylene glycol, inorganic sub-micron particles, a catalyst and a flatting agent, wherein the molar ratio of ethylene glycol to terephthalic acid is (1.3-1.8) : 1; the inorganic sub-micron particles are CaCO3 or CaSO4, and the mass ratio of the inorganic sub-micron particles to terephthalic acid is 0.5-2%; the catalyst is ethylene glycol antimony or antimony trioxide, and the mass ratio of the catalyst to terephthalic acid is 0.03-0.06%; and the flatting agent is TiO2, and the mass ratio of the flatting agent to terephthalic acid is 0.1-1.0%. The preparation method comprises the steps as follows: performing melt spinning on the modified polyester, drawing, cooling, and winding to obtain the low-strength low-elongation terylene filament. The low-strength low-elongation terylene filament has the advantages that the hygroscopicity, bulkiness and air permeability of the product are improved; the situation that fibers in the tearable non-woven medical gauze are arranged according to a certain direction is improved, and the service life is prolonged; the heat resistance and the heat stability are improved as compared with the those of the non-woven fabric and other tearable gauze and hygienic cloth; and the light fastness is good, the gloss retention, the color retention and the yellowing resistance and the like can be improved, and the use field is enlarged.

The invention discloses a high strength impact-resistant cable. The high strength impact-resistant cable comprises a conductor, wherein a sheath wraps the conductor; the sheath is made from a polypropylene composite material, and raw materials in parts by weight of the polypropylene composite material comprise: 100 parts of polypropylene, 15-30 parts of polyurethane, 5-20 parts of nylon 66, 2-5 parts of polypropylene grafted polystyrene, 2-6 parts of 1,2-polybutadiene, 10-25 parts of modified filler, 3-8 parts of nano rubber powder, 1-5 parts of sodium 2,2'-methylene-di(4,6-di-n-butyl phenol) phosphate, 0.5-2 parts of stearic acid, 0.5-2 parts of dibenzoyl peroxide, 3-15 parts of a flame retardant and 1-3 parts of an antioxidant. The high strength impact-resistant cable provided by the invention has high strength, good impact resistance, excellent anti-aging and flame retardant properties and long service life.

The invention realizes the even distribution of nano calcium carbonate in PP (Polypropylene) by carrying out filling modification on the PP through applying a supercritical CO2 rapid diffusion technology, thereby greatly improving the stability and the mechanical performance of the modified material. The supercritical CO2 plays a role of plasticization on the PP by unique gas-liquid two-phase performance in the production process, the melting temperature of the PP is reduced, and meanwhile, CaCO3 is uniformly distributed in the PP by the high diffusion and permeability of supercritical CO2. The invention researches a high-performance nano CaCO3 filled microcrystal PP powder. The effect of a microcrystal attributes to the sharp diffusion process from a supercritical state to normal temperature and normal pressure of the whole system; a crystal nucleus of the PP is too late to grow due to the sharp performance of conversion; the optical performance and the transparency are greatly improved by great reduction of the sphaerocrystal size, and the microcrystal structure is beneficial to reducing the contraction of a final injection molding product; and the invention improves the size stability of products and is an ideal high-grade automobile special material.

The invention discloses high-strength siliceous brown glaze electric porcelain and a preparation method thereof, and relates to the technical field of siliceous electric porcelain. The invention discloses a high-strength siliceous brown glaze electric porcelain, the raw materials comprise a blank material and a brown glaze material; the blank material comprises the following raw materials: kaolin, wollastonite, Jiepai mud, siliceous porcelain waste powder, low-melting-point glass powder, spodumene, yttrium oxide, ceramic-grade talcum powder and a nucleating agent; the brown glaze material is composed of the following raw materials: potassium feldspar powder, quartz powder, blank mud, calcite powder, cooked talcum powder, iron oxide, chrome green, manganese sesquioxide and Jiepai mud. The invention also discloses the preparation method of the brown glaze electric porcelain. The siliceous brown glaze electric porcelain has the advantages of simple and easily available raw materials, low cost, high bending strength, good plasticity and good stability; and the brown glaze is low in cost, short in glaze dipping time, good in glazing effect, ruddy and full in glaze surface, bright in luster, stable in color generation and free of color difference, and the strength of the brown glaze electric porcelain is improved by 10% or above compared with the strength of the brown glaze electric porcelain before glazing.

The invention relates to the technical field of modified polypropylene materials for automobiles, and provides a special low-linear expansion coefficient polypropylene material for bumpers, and a preparation method thereof. Polypropylene is toughened and modified with thermoplastic polyurethane, a compatibilizer prepared from maleic anhydride grafted polypropylene and dodecanediamine is used to improve the interfacial bonding between the polypropylene and the thermoplastic polyurethane, glass fibers are adopted to modify the polypropylene to increase the strength and reduce the linear expansion coefficient, and a titanate coupling agent is used to improve the dispersibility of the glass fibers in the polypropylene. Compared with special polypropylene materials prepared by conventional methods, the special polypropylene material prepared in the invention has the advantages of high tensile strength, high flexural modulus, high notch impact strength, significantly reduced linear expansioncoefficient, and realization of good dimensional stability of the bumpers.

The invention discloses a bio-based thermoplastic elastomer material and a preparation method thereof. The bio-based thermoplastic elastomer material comprises following raw materials by weight: 10-60 parts of a 3-hydroxybutyrate homopolymer, 10-60 parts of a hydroxyalkanoate copolymer, 10-120 parts of an ethylene-vinyl acetate random copolymer and 0.01-3 parts of a functional auxiliary agent. The bio-based thermoplastic elastomer material prepared by the preparation method has characteristics of small spherocrystal dimension, high springback rate, good resilience after being repeatedly stretched, high strength, large elongation percentage, excellent thermoplastic properties, and the like. The preparation method is simple and prone to industrialization.

The invention discloses a nano-Al2O3 modified biopolymer material and a preparation method thereof. The nano-Al2O3 modified biopolymer material is formed through mixing and extruding 3-20 parts of a modifying nano-Al2O3 material, 97-80 parts of P(3HB-co-4HB), 0.1-0.3 parts of a heat stabilizer and 0.1-0.3 parts of a lubricant. A biopolymer material poly(3-hydroxy butyrate-3-co-4-hydroxy butyrate) [P(3HB-co-4HB)] material is modified with nano-Al2O3 through a melt blending technology to improve the disadvantages of low crystallization rate, severe post-crystallization, low strength and poor toughness of the [P(3HB-co-4HB)] material, and the [P(3HB-co-4HB)] material has good biodegradability and biocompatibility, so the nano-Al2O3 modified biopolymer material has wide application prospect in the fields of biological and degradable materials.

The invention discloses a preparation method of a polypropylene composite material used for a shell cover of a storage battery. The preparation method is characterized by comprising the following steps: taking the following raw materials in parts by weight: 10 to 20 parts of dried raw material PP (Polypropylene) powder, 70 to 85 parts of high-transparency homopolymerized PP, 5 to 15 parts of ethylene propylene diene monomer, 0.1 to 0.3 part of a nucleating agent of the raw materials, 0.5 to 1 part of a silicon flame retardant and 1 to 2 parts of an antimony oxide flame retardant; mixing all the raw materials to obtain a mixture; pouring the mixture into a mixing machine, and stirring and mixing for 5 to 10 minutes; then adding the mixture into a double-screw extruder, and fusing, extruding, cooling, dicing and drying; injecting and molding to prepare the polypropylene composite material used for the shell cover of the storage battery. The composite material prepared by the invention has good mechanical properties and high-temperature-resisting and low-temperature-resisting stability properties, is particularly suitable for the shell cover of the storage battery, and also can be used for fields including packages with high transparency requirements, medical equipment, household articles, common industries and the like.

The invention provides ultrasonic plasticizing and injection molding equipment for a micro-nano device. The ultrasonic plasticizing and injection molding equipment comprises a base and an injection structure and a molding structure which are arranged on the base, wherein the injection structure comprises an ultrasonic transducer and an injection driving unit for driving the ultrasonic transducer to achieve vertical feeding, the ultrasonic transducer is used for melting and plasticizing polymer particles in the molding structure, and assisting in injection molding of a molten polymer; the molding structure comprises a mold unit and a mold clamping unit, wherein the mold clamping unit is used for mold closing, mold clamping and mold opening of the mold unit; and the mold unit comprises an upper mold with a built-in upper mold core and a lower mold with a built-in lower mold core, wherein the upper mold core is matched with the lower mold core to form a molding cavity to mold the molten polymer under maintained pressure.

The invention discloses a flame-retardant and anti-impact cable. The flame-retardant and anti-impact cable comprises a conductor, wherein the conductor is covered with a sheath; the sheath is prepared from a polypropylene composite material; and the polypropylene composite material comprises the following raw materials: polypropylene, ethylene-propylene-diene monomer rubber, epoxy resin, ethylene-propylene-diene monomer rubber grafted maleic anhydride, 1,2-polybutadiene, nanomicelle powder, magnesium hydroxide, red phosphorus, zinc borate, calcium sulfate whisker, cellulose whisker, gypsum, calcium carbonate, 2,2-methylene-di(4,6-di-n-butyl-phenol) sodium phosphate, stearic acid, dicumyl peroxide, a silane coupling agent, triethylhexyl phosphoric acid and an antioxidant. The flame-retardant and anti-impact cable is high in strength, good in impact resistance and excellent in flame retardant property.