50results about How to "Solve the uniform dispersion" patented technology

The invention provides a preparation method of a polylactic acid / nano cellulose composite material. The composite material comprises the following components in percentage by weight: 55 to 99.8% of polylactic acid, 0.1 to 15% of nano cellulose, and 0.1 to 30% of polyethylene glycol. The method comprises the following steps of: preparing a 5 to 15% an aqueous solution of microcrystalline cellulose, dripping concentrated sulfuric acid until the concentration of sulfuric acid reaches 40 to 60%, stirring and reacting for 1 to 2hours, carrying out centrifugation, ultrasound treatment and adjusting pH value to be neutral to obtain a nano cellulose suspension; dissolving polyethylene glycol, mixing with the nano cellulose suspension, stirring for 1 to 3hours at the temperature of 90 DEG C and carrying out vacuum drying to obtain a polyethylene glycol / nano cellulose comixture; and carrying out melt blending on the polyethylene glycol / nano cellulose comixture and polylactic acid for 5 to 8minutes at the temperature of 120 to 170 DEG C to obtain the composite material. The method is convenient and simple to operate, short in the time of the preparation process and solves the problem of uniform dispersion of nano-cellulose in the polylactic acid.

The invention provides a composite catalytic system used for synthesizing a petroleum resin, which is a homogeneous transparent solution or a homogeneous disperse system prepared by the following raw materials by weight portion: 1 portion of anhydrous alchlor, 2 to 10 portions of nucleophile and 1 to 20 portions of auxiliary catalyst. Composite catalyst of the composite catalytic system can solvethe problem of homodisperse of solid catalyst AlCl3 during the process of polymerization of the petroleum resin, and can realize stable technique. Moreover, charging is easy; measurement is easy; andcontinuous operation can be realized. The softening point of the resin prepared is between 85 and 135 DEG C; the conversion rate of active ingredients reaches between 60 and 85 percent; and the average molecular weight is between 400 and 700. The synthesized petroleum resin can be widely applied to oil paint, road marking paint and printing ink.

The invention discloses a preparation method of a POSS (Polyhedral Oligomeric Silsesquioxane) modified polysiloxane rubber composite material. The preparation method is characterized in that the POSS containing single / double reactive functional groups is introduced into a polysiloxane molecular chain containing a plurality of reactive functional groups by virtue of grafting or blocking in a chemical copolymerization manner, and then a POSS modified polysiloxane oligomer with the POSS as a polysiloxane hanging chain and the POSS as a polysiloxane block chain, next, 0.1-100 parts of POSS modified polysiloxane oligomer is evenly dispersed in 100 parts of polysiloxane raw rubber by virtue of physical blending, and finally, 0-50 parts of white carbon black and 0.2-10 parts of a curing agent are added to the mixture for cross-linking and solidification and then the POSS modified polysiloxane rubber composite material is obtained. The POSS modified polysiloxane rubber composite material has excellent high and low temperature resistance, mechanical properties and dielectric property, and can be applied to the technical fields of automobiles, electronics, building materials as well as national defense and aerospace.

The invention relates to a preparation method of a carbon-nanotube-enhanced copper-based composite material, and belongs to the technical field of composite material preparation. The method comprises:putting carbon nanotubes in an acid solution, performing ultrasonic dispersion treatment for 20-120 min, performing heating to 50-80 DEG C, maintaining the constant temperature for 5-15 h, and performing filtering, washing, and drying to obtain pre-treated carbon nanotubes; preparing a carbon nanotube and copper salt composite solution with the pre-treated carbon nanotubes; taking a pure titaniumplate as a cathode, a pure copper plate as an anode, the carbon nanotube and copper salt composite solution as a plating solution, performing electroplating at the temperature of 25-50 DEG C with thecurrent density of the cathode being 0.5-20 A / dm2; when the deposition electric quantity is 50-200 C, taking the cathode out, peeling a composite film off, and cleaning and drying the composite filmto obtain carbon-nanotube-enhanced copper-based composite film; laying the composite films layer by layer, and performing compacting molding to obtain a carbon-nanotube-enhanced copper-based compositeblock; and sintering the composite block to obtain the carbon-nanotube-enhanced copper-based composite material. In the composite material, carbon nanotubes are uniformly distributed in the compositefilm layer in a network manner.

The invention relates to a one-step in situ synthesis method for preparing transparent organic flaming retarding composite material. Methyl methacrylate is taken as raw material, Na-montmorillonite and magnesium hydroxide are taken as fire retardant, firstly the Na-montmorillonite is purified, magnesium hydroxide microemulsion is prefabricated, methyl methacrylate monomer is added into a four-opening flask, and initiating agent azodiisobutyronitrile absolute alcohol solution is dripped in under the conditions of protection of nitrogen, water circulation condensation, continuous heating at constant temperature and uniform stirring, thus methyl methacrylate + magnesium hydroxide + Na-montmorillonite three phase composite material, namely the organic flaming retarding nano composite material, is synthesized by one step. The material is in white unconsolidated composite particle power, the average particle size of magnesium hydroxide in base after film forming is 60nm, the Na-montmorillonite is stripped, luminousness of product is 85%, absorption rate of ultraviolet light is 40%, limited oxygen index is improved from 19% to 26%, and hardness can be improved by 10%. The method uses less devices, process flow is short, no environmental pollution is produced, and yield is high.

The invention discloses a nylon / silica composite microsphere, a preparation method and an application thereof. The composite microsphere is spherical and / or near spherical particles with the particle size of 0.5-300 [mu]m, and is formed by an aperture-containing nylon microsphere matrix and silica uniformly dispersed in the aperture-containing nylon microsphere aperture and / or surface. The content of the aperture-containing nylon microsphere is 10-99.9 wt%, and the content of the silica is 0.1-90 wt%. The composite microsphere is obtained by performing silica in-situ hydrolysation in aperture-containing nylon microsphere dispersion liquid. Addition of silica can effectively reduce the water absorption of the aperture-containing nylon microsphere, and increases the heat stability, crystallization property and mechanical intensity; the composite microsphere can be taken as consumable in a SLS selective laser sintering technology, and widens the application of the SLS technology in the fields of aviation, automobile, medical apparatus, electronic apparatus, machinery die and artwork.

The invention belongs to the technical field of functional polymer materials, and in particular relates to a self-bacterial lactic acid-based aqueous polyurethane, a preparation method thereof and an emulsion thereof. In the present invention, water-based chitosan and juniper alcohol structures are introduced into the side chain of the large polyurethane long chain from the antibacterial lactic acid-based water-based polyurethane and evenly distributed, so that the two substances with different antibacterial and biocidal mechanisms can produce synergistic effects of biocide and antibacterial. It can effectively reduce the drug resistance of bacterial organisms, and at the same time, the two are grafted on the long chain of polyurethane in the form of chemical bonds, and the antibacterial is durable.

The invention discloses a stable nano-grade oxide dispersion which includes the components as the following weight percentages: 10 to 20 percent of nano-grade oxide, 40 to 60 percent of dimethyl acetamide, 20 to 40 percent of polyamide acid salt as well as 0.1 to 1 percent of ethoxy silane. The invention also discloses a preparation method for the stable nano-grade oxide dispersion. The stable nano-grade oxide dispersion stabilizes the production technique of a corona-resistant polyimide film and ensures the corona-resistant performance of the polyimide film; besides, the performance is stable and the cost is lower.

The present invention provides fully biodegradable and multi-functional plastic mulch. The plastic mulch comprises, by weight percent: natural biopolymers of starch or derivatives thereof, biodegradable synthetic polymers, an interfacial reinforcer, a compound plasticizer with urea as a main ingredient, a nitrogen phosphorus and potassium compound fertilizer, pesticides, herbicides and trace fertilizers. The plastic mulch of the present invention not only has heat and moisture preservation functions, and is fully biodegradable after use, eliminating the contamination to soil causes by residual plastic mulch debris; and functional additives of fertilizers and nutrients, pesticides, herbicides etc. in the plastic mulch are sustainedly released as the plastic munch degrading, so the plastic mulch has long lasting effects of weed controlling, pest killing, and sustainedly released fertilizing, significantly reducing the use amount of fertilizers and pesticides, decreasing costs, and protecting the ecological environment. The invention also provides a method for preparing the multi-functional plastic mulch.