47results about How to "Improved crystallization behavior" patented technology

The invention discloses a blended foam material based on PLC and modified PLA and a preparation method thereof, and belongs to the foam material field. The foam material comprises, by weight, 60-90 parts of PLA, 1-25 parts of PCL, 2-10 parts of reinforcing agents, 1-3 parts of nanometer nucleating agents, 4 parts of foaming agents, 0.1-1 part of a blowing promoter, 1-3 parts of environment-friendly flame retardants and 0.5-1 part of a surfactant. According to the foam material and the preparation method thereof, composite foamed plastics with good mechanical properties and superior surface quality can be prepared.

The invention provides a nano-composite material high-wax thick oil pour point-depressing and viscosity-reducing agent and a preparation method thereof. The pour point-depressing and viscosity-reducing agent comprises nano-silica, a silane coupling agent, octadecyl methacrylate, maleic anhydride, styrene and acrylamide; a mass/volume ratio of the nano-silica to the silane coupling agent is (2-3):1g/mL, and a molar ratio of octadecyl methacrylate to maleic anhydride to styrene to acrylamide is (3-8):1:2:1; and a mole/volume ratio of octadecyl methacrylate to the silane coupling agent is (3-8):1 mol/mL. The invention also provides a preparation method of the pour point-depressing and viscosity-reducing agent. The pour point-depressing and viscosity-reducing agent has the advantages of pourpoint depressing and viscosity reducing effects, good effects, improvement of the low-temperature fluidity of crude oil, simple and easily controlled production processes, effectiveness in solving ofthe problems that a pour point depressant and a viscosity reducer cannot be considered at the same time and the low-temperature fluidity of thickened oil is poor, and wide application prospect.

The invention discloses a nano zinc oxide modified foaming material. The nano zinc oxide modified foaming material comprises components in parts by weight as follows: 80-95 parts of polylactic acid, 10-20 parts of bisphenol epoxy resin, 5-30 parts of polycaprolactone, 5-20 parts of nano zinc oxide, 6-18 parts of a compound foaming agent, 3-5 parts of a quaternary ammonium compound or fatty glyceride, 3-8 parts of an organic phosphate nucleating agent or organically modified nano-montmorillonite and 1-2 parts of lauric acid. According to the nano zinc oxide modified foaming material, the process is simple and easy, and the polylactic acid based composite foaming conductive material with excellent conductivity and general mechanical performance, good heat resistance and controllable density can be prepared economically and effectively.

The invention relates to a high-barrier thin film modified by a nano rare earth nucleating agent. The thin film comprises a surface layer 1, a core layer and a surface layer 2 and is characterized in that the surface layer 1 contains 10-30 percent of MXD6, 63-84.9 percent of PA6, 2-4 percent of anti-sticking master batch, 3-8 percent of a compatilizer and 0.1-5 percent of the nano rare earth nucleating agent; the core layer contains 95-99.9 percent of MXD6 and 0.1-5 percent of the nano rare earth nucleating agent; the surface layer 2 contains 10-30 percent of MXD6, 63-84.9 percent of PA6, 2-4 percent of anti-sticking master batch, 3-8 percent of the compatilizer and 0.1-5 percent of the nano rare earth nucleating agent. The tensile strength and the haze of the modified high-barrier film are better improved.

The invention relates to the technical field of lithium battery separators and provides a dry unilateral-stretching production technology of a lithium battery separator. The dry unilateral-stretchingproduction technology of the lithium battery separator solves the problem that the hole size distribution of a lithium battery separator produced in the prior art is uneven. The dry method unilateralstretching production technology of the lithium battery separator comprises the following steps of (1) preparing materials, wherein polypropylene and ethylene-propylene copolymer are used as raw materials, pre-dried respectively and then put into a high-speed mixer to be stirred to uniform; (2) conducting melt extrusion, wherein the evenly mixed raw materials are fed into an extrusion machine andplastified into uniform melt, and the uniform melt is extruded from a slit die; (3) conducting tape casting film formation, wherein the melt undergoes tape casting and then forms a polypropylene basefilm, and the polypropylene base film undergoes traction and coiling; (4) conducting annealing treatment, wherein the coiled polypropylene base film is placed in a drying box to undergo annealing treatment; (5) conducting unilateral stretching, wherein the annealed polypropylene base film undergoes cold stretching and hot stretching; and (6) conducting heat setting, wherein heat setting is conducted on the polypropylene base film completing unilateral stretching, and after cooling and coiling, the lithium battery separator is obtained.

The invention discloses a preparation method of a phase change composite material with a high phase change enthalpy. The preparation method comprises the following steps: (1) synthesizing nano-flower-shaped mesoporous organic silicon; and (2) preparing shape-stabilized the phase change composite material by taking the nano-flower-shaped mesoporous organic silicon as a carrier. The preparation method disclosed by the invention has the advantages that the nano-flower-shaped mesoporous organic silicon is taken as the carrier for fixing PEG (polyethylene glycol) to prepare the shape-stabilizedphase change composite material, so that the crystallization behavior of PEG molecules is improved, and the phase change enthalpy of the shape-stabilized phase change composite material is increased; the PEG modified by GO forms a cross-linked network, so that the stability of the phase change composite material is increased; and interior of the network of the PEG is filled with the GO to form afilled structure, so that the thermorheological behavior and the crystallization behavior of the phase change composite material are effectively improved.

The invention relates to a poly-hydroxyalkanoate degradable composite material containing a carbon nanomaterial and a preparation method thereof. The composite material is constructured by introducing a high thermal conductive carbon nanomaterial into a poly-hydroxyalkanoate matrix to form an efficient thermal conductive network in the composite material to accelerate dissipation of heat discharged by crystals. The carbon nanomaterial is used as a nucleating agent at the same time to promote nucleation and crystallization of the poly-hydroxyalkanoate matrix. The carbon nanomaterial is further used as a flexibilizer to strengthen the obtained composite material. The mass ratio of the poly-hydroxyalkanoate matrix to the carbon nanomaterial is 10:1 to 2000:1. Compared with the prior art, the carbon nanomaterial has the advantages of high machining property, high mechanical property and high thermal property, low production cost and the like.

The invention discloses a heat-resistant impact-resistant polypropylene composition and a preparation method thereof, and belongs to the technical field of polypropylene materials. The polypropylene composite is characterized by comprising the following components in parts by weight: 100 parts of a polypropylene resin powder, 0.03-0.3 part of a hyper-branched polymer powder, 0.02-0.1 part of an inorganic nucleating agent, 0.05-0.3 part of an antioxidant, 0.02-0.1 part of an acid absorbent, and 0.03-1.0 part of an antistatic agent, wherein the polypropylene resin is a homo-polymerized polypropylene resin powder, a melt mass flow rate of the homo-polymerized polypropylene resin under the conditions of 2.16 kg and 230 DEG C is 20-60 g/10 min, the isotacticity of polypropylene is 95% or more,and Mw/Mn is 4-12. Through the synergistic effect of a small amount of hyper-branched polyethylene and a small amount of nano-scale white carbon black added in the composition, the rigidity and toughness balance of a product is achieved, the crystallization speed is increased, and the crystallization behavior of polypropylene is improved, so that the size of resin crystals is finer and denser, thescattering and refraction of an incident light are reduced, and the glossiness of the product is increased.

The invention provides a high tenacity one-dimensional titanium dioxide nanowire modified PP material and a preparation method thereof, and belongs to the field of high polymer materials. The PP material is prepared from the following components in parts by weight: 50-80 parts of polypropylene, 5-40 parts of modified one-dimensional TiO2 nanowire, 1-2 parts of an antioxidant, 1-2 parts of a lightstabilizer and 5-10 parts of a fire retardant; the modified one-dimensional TiO2 nanowire is obtained by adding one-dimensional TiO2 nanowire into a surfactant for surface modification, the diameter of the modified one-dimensional TiO2 nanowire is 10-200nm, and the length is 50nm-5micron. The invention further provides the preparation method of the high tenacity one-dimensional titanium dioxide nanowire modified PP material. The material has the high tenacity.

The pyrometamorphism treatment method to add mixed rare-earth with Ce as main into the high-temperature electrolytic aluminum solution can improve the fused mass inner structure effectively, eliminates the low-strength on high-temperature phenomena, further improves the crystallization behavior, has important meaning for casting high-performance aluminum alloy, and thereby brings great economic and social benefits.

The invention discloses a method for preparing a recycled regenerated plastic for printing. The recycled and regenerated plastic for 3D printing, which is disclosed by the invention, comprises 60-70 parts of a recycled plastic, 5-20 parts of glass fibers, 3-10 parts of graphenoid, 1-10 parts of a toughening agent, 2-3 parts of a dispersant, 1-15 parts of biochar, 1-5 parts of a compatibilizer, 0.1-2 parts of a chain extender, 0.5-1 part of a lubricant, 0.1-5 parts of a foaming agent and 1-8 parts of other additives. In addition, recycled and regenerated plastic may also comprise 10-60 parts ofEVA (ethylene vinyl acetate), and the content of VA (vinyl acetate) of EVA is 20-55%. The graphenoid is one of silicene, germanene and molybdenum disulfide surface activity treatment. The chain extender is one or more of pyromellitic dianhydride, dicumyl peroxide and an acrylonitrile-butadiene-styrene copolymer. The recycled and regenerated plastic is one or more of ABS (acrylonitrile butadiene styrene), polypropylene and PET (polyethylene terephthalate).

The invention discloses a biodegradable polylactic acid film and a preparation method thereof. The biodegradable polylactic acid film comprises the following components: 70-95 parts of polylactic acid (PLA), 4-29 parts of poly (butyl carbonate) (PBC), 0.1-1 part of a chain extender epoxy acrylic copolymer, 0.1-10 parts of a plasticizer tung oil anhydride, 0.1-1 part of a heat stabilizer zinc stearate and 0.1-5 parts of a nucleating agent phenyl phosphonic acid loaded calcium carbonate powder. The preparation method comprises the steps of uniformly mixing the raw materials in proportion, carrying out melt blending by a twin-screw extruder to obtain the modified polylactic acid film blowing special resin, and carrying out blow molding by a film blowing machine to form the film. The PLA film prepared by the method has high tensile strength, good opening performance and good transparency.

The invention relates to the technical field of new materials, and discloses a functional modified silicon dioxide flame-retardant modified polylactic acid composite fiber. Silicon dioxide reacts with adipic acid to obtain carboxylated silicon dioxide; the carboxylated silicon dioxide reacts with hydroxyl-terminated butadiene-acrylonitrile rubber to obtain hydroxyl-terminated butadiene-acrylonitrile rubber modified silicon dioxide; the hydroxyl-terminated butadiene-acrylonitrile rubber modified silicon dioxide reacts with isophorone diisocyanate to obtain isocyanate butadiene-acrylonitrile rubber modified silicon dioxide; the isocyanate butadiene-acrylonitrile rubber modified silicon dioxide further reacts with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to obtain phosphaphenanthrene-based butadiene-acrylonitrile rubber modified silicon dioxide; the phosphaphenanthrene-based butadiene-acrylonitrile rubber modified silicon dioxide is mixed with polylactic acid; and melt spinning is performed to obtain the functional modified silicon dioxide flame-retardant modified polylactic acid composite fiber. Butadiene-acrylonitrile rubber and nano silicon dioxide can absorb and disperse stress energy, a phosphaphenanthrene group can generate oxyacid of phosphorus when being combusted to promote carbon formation of a matrix and form a carbon protection layer, and the nano silicon dioxide is deposited on the surface of a carbon layer to enhance the barrier effect, so that the flame retardant property of the composite fiber is enhanced.

The invention relates to homogeneous hyper-viscous polyester and a preparation method thereof. The method comprises the following steps of: controlling the mechanism of adding a catalyst during a synthesis process to obtain low-viscous polyester with an intrinsic viscosity of 0.300-0.500 dL/g, and then performing solid phase thickening on the low-viscous polyester to obtain the homogeneous hyper-viscous polyester with an intrinsic viscosity of 0.85-1. 15dL/g, an intrinsic viscosity deviation less than or equal to 0.02dL/g and a molecular weight distribution index of 2.5, wherein the catalyst is added when the average polymerization degree of an intermediate product in a polymerization reaction reaches 8-17; the pre-reaction of the solid-phase thickening is divided into four stages which are a first stage, a second stage, a third stage, and a fourth stage, the corresponding temperatures are 190-195 DEG C,195-210 DEG C, 210-220 DEG C and 220-230 DEG C respectively. The preparation methodof the homogeneous hyper-viscous polyester obviously reduces the content of oligomer in a product, and the prepared polyester has high quality and excellent popularization value.

The invention provides a preparation method of a polyethyleneimine functionalized carbon nanotube modified polyformaldehyde composite material. The preparation method comprises the following steps: A)mixing carbon nanotube with an acid to obtain carboxylated carbon nanotube; b) mixing and reacting the carboxylated carbon nanotube and polyethyleneimine in the presence of a condensing agent to obtain a polyethyleneimine functionalized carbon nanotube product; and C) reacting polyformaldehyde with the polyethyleneimine functionalized carbon nanotube product, and molding to obtain the product. According to the method disclosed by the invention, the polyethyleneimine functionalized carbon nanotubes can be uniformly dispersed in the polyformaldehyde matrix, and the interface bonding force between the carbon nanotubes and the polyformaldehyde is improved; therefore, the thermal stability of the polyformaldehyde composite material is improved, the crystallization behavior and the mechanical property are improved, and the polyformaldehyde composite material can be widely applied to the fields of automobiles, electronic appliances, machinery, precise instruments, building materials and thelike.