34results about How to "Reduced reunion tendency" patented technology

The invention discloses a soft nanometer micro area flexibility-enhanced PET composite material and a preparation method thereof. The flexibility-enhanced PET composite material comprises the following components in mass percent: 80 to 93 percent of polyethylene terephthalate, 1 to 5 percent of a porous nanometer inorganic powder, 5 to 10 percent of liquid low polymers, 1 to 5 percent of polar grafted polymers, and a proper amount of an antioxidant. The method comprises the steps of grinding PET into a powder after the PET is cooled, soaking the nanometer inorganic powder through the liquid low polymer, so as to ensure that the nanometer inorganic powder is sufficiently soaked and absorbed by the liquid low polymer and to form a soft and elastic spherical nanometer structure, and improving the wetting property of the surface of the nanometer inorganic powder through the polar grafted polymer, so as to ensure that the nanometer inorganic powder can be uniformly dispersed in a PET matrix and a soft nanometer micro area can achieve the effect of flexibility enhancement in the PET. A PET sheet produced by adding the flexibility-enhanced composite material has excellent impact property, and maintains good optical property.

The invention discloses a method for preparing flame-retardant expandable polystyrene spheres containing delamination graphite, relates to a method for preparing flame-retardant expandable polystyrene spheres, and aims at solving the technical problems that the expandable polystyrene containing delamination graphite containing graphite granules prepared by the existing method is polymerized and easily aggregated in a suspension manner, the graphite granules are uneven to disperse in polystyrene, and poor in flame-retardant insulation performance of the expandable polystyrene. The preparation method disclosed by the invention comprises the following steps: 1, weighing raw materials according to parts by weight; 2, preparing a first mixture; 3, preparing a second mixture; 4, adding the second mixture to the first mixture under agitation, adding an emulsifier after reaction, continuing to react, and then adding pentane, charging nitrogen into a reaction kettle, heating up and reacting, naturally cooling after reaction is ended, slowly releasing a gas and discharging until the pressure is zero; washing and drying, so as to obtain the flame-retardant expandable polystyrene spheres containing delamination graphite. The method is applied to the field of preparation of the flame-retardant expandable polystyrene spheres.

The invention relates to the technical field of energy storage materials, in particular to a method for improving the breakdown strength and energy storage density of polymers. The invention provides a method for improving the breakdown strength and energy storage density of a polymer. The method is: adding hydroxylated hexagonal boron nitride to the polymer, wherein the mass ratio of the polymer to the hydroxylated hexagonal boron nitride is : 100 parts by weight of polymer, 2 to 14 parts by weight of hydroxylated hexagonal boron nitride. The BNNSs modified product provided by the invention has a better dispersion effect in polymers, greatly reduces the tendency of BNNSs to agglomerate in polymers, and is very beneficial to the improvement of the breakdown strength and energy storage density of composite capacitors.

The invention discloses a EUO (Europium Oxide) structural molecular sieve with hierarchical pores and wide silica-alumina ratio and a synthetic method. The synthetic method comprises the following steps: performing crystallization synthesis by taking a long-chain silane compound as a crystallization assistant, taking double quaternary ammonium salt with an alkane structure being substituted by a double quinary heterocyclic group as an organic template, and heating silica-aluminum sol to a target temperature at the rate of 2 to 20 DEG C / h, wherein the target crystallization synthesis temperature is 150 to 200 DEG C; then performing separation, washing, drying and roasting to remove the organic template in order to obtain EUO structural molecular sieve raw powder with hierarchical pores andwide silica-alumina ratio, and performing ammonium ion exchange, drying and roasting in sequence to obtain an H-type EUO structural molecular sieve with hierarchical pores and wide silica-alumina ratio. The zeolite molecular sieve provided by the invention has the advantages of hierarchical pore structure, wide silica-alumina ratio range, small grain size, high relative crystallinity and high hydrothermal stability. Reaction evaluation shows high isomerization activity and selectivity of xylene, so that the EUO structural molecular sieve has a very good industrial application prospect.

The invention discloses a hierarchical-pore EUO structure molecular sieve and a synthesis method thereof. The synthesis method comprises the following steps: crystallizing and synthesizing an silicon-aluminium solution by raising to target temperature at the heating rate of 2-20 DEG C / h by taking a long-chain silane compound as a crystallization assistant and biquaternary ammonium salt of a bi-hexa-heterocycle group substituted alkane structure as an organic template agent, wherein the target crystallizing and synthesizing temperature is 150-190 DEG C; then separating, washing, drying and roasting to remove the organic template agent to obtain a hierarchical-pore EUO structure molecular sieve material; and then sequentially performing ammonium exchange, drying and roasting to obtain the H-type hierarchical-pore EUO structure molecular sieve. The zeolite molecular sieve provided by the invention has a hierarchical-pore structure, and is wide in product silicon-aluminium ratio, small ingrain size and high in relative crystallinity, and strong in hydrothermal stability; reaction assessment shows good xylene isomerization activity and selectivity, and therefore, the hierarchical-poreEUO structure molecular sieve has good industrial application prospect.

The invention relates to the field of inorganic coating, and aims to provide a method for preparing nanometer toughened inorganic transparent protective coating. The method includes weighing various raw components according to set weight percentages; adding methyl silicate, phosphate, nanometer fillers, dispersing agents, surfactants and deionized water into ingredient barrels, and stirring the methyl silicate, the phosphate, the nanometer fillers, the dispersing agents, the surfactants and the deionized water to form mixed slurry; injecting the mixed slurry into nanometer ball mills and grinding the mixed slurry; adding water glass and defoaming agents into dispersion machines, stirring the water glass and the defoaming agents and then adding the ground mixed slurry into the dispersion machines; continuing to stir the water glass, the defoaming agents and the ground mixed slurry to obtain the nanometer toughened inorganic transparent protective coating. The method has the advantages that inorganic coating is toughened by nanometer materials, and accordingly good toughening effects can be realized without deterioration of the mechanical properties (such as the hardness and the abrasion resistance), the water resistance, the aging resistance and the like of coatings; the nanometer materials are stable in performance and can be mixed with the strong-alkalinity inorganic coating without qualitative change; fillers are ground by nanometer sanders, the particle sizes of the fillers can be reduced and are smaller than or equal to 0.2 micrometer, accordingly, the method is favorable for preparing transparent inorganic coatings, the trend of agglomeration of the nanometer fillers can be weakened, and the toughening effects can be effectively realized by the nanometer fillers.

The invention provides a lead selenide quantum dot / graphene composite material and a preparation method thereof. The composite material is prepared with graphene oxide sheets as a hard template through an ionic complexing method. Firstly, through the complexing and electrostatic effects between carboxylic groups in the graphene oxide and soluble lead salt, lead ions are immobilized on the surface of the graphene oxide, and then a less amount of an alkaline solution is dropwisely added slowly, wherein a certain interval is maintained between graphene oxide sheets through electrostatic repulsion between hydroxide ions and carboxylate ions. A selenium precursor solution is prepared under protective of nitrogen and then is added to the graphene oxide / lead ion complex to to be in a reflux reaction. A reduction agent is then added to reduce the graphene oxide sheets to prepare the lead selenide quantum dot / graphene composite material. The method is simple in operation, is convenient to operate and is repeatable. The composite material has high electron transportation performance of graphene, is high in Seebeck coefficient, and has excellent application prospect in the field of thermoelectricity.

The invention provides an antibacterial skin care polypropylene fiber masterbatch, which belongs to the field of functional fiber masterbatch and fabrics. The masterbatch has the following components in parts by weight: 30-60 parts of polypropylene resin; plant extract 3-15 parts; 8-25 parts of antibacterial agent; 2-10 parts of auxiliary agent; wherein, the plant extract is a plant extract with skin care effect; the antibacterial agent is Fe-doped zinc oxide nanosheets, so The Fe-doped zinc oxide nanosheets are firstly prepared by a secondary hydrothermal method with Zn-Fe hydroxide with a hydrotalcite-like layered structure, and then roasted in high-purity nitrogen to prepare a zinc oxide with oxygen defects. Nano-sheets, reduce the surface polarity of zinc oxide, reduce the tendency of agglomeration, and improve the compatibility with polypropylene melt.