40results about How to "Heterogeneous nucleation" patented technology

The invention relates to nano bentonite for plastic modification and a preparation method thereof, which is characterized in that a nano bentonite product for plastic modification is obtained through the special processing of natural bentonite in five steps of whitening through purification and acidification, sodium activation, intercalation organization, surface finishing and coating. The purity of the nano bentonite reaches more than 95 percent, the whiteness reaches more than 80 degrees, the interlayer spacing after intercalation organization reaches more than 2.7nm, and the thermal weight loss at the temperature of 280 DEG C is below 3 percent. The nano bentonite has good compatibility with a high molecular material (mainly a plastic material), is more beneficial to keeping mechanical performance, has good dispersive property, is easy to process, can perform the action of heterogeneous nucleation for crystallized plastics, improves the mechanical performance thereof, is used for plastic flame retardant modification, can reduce the addition of a flame retardant by 30 percent, and not only is beneficial to keeping the mechanical performance, but also can lower the cost.

The invention discloses a high-rigidity high-transparency polypropylene composite material, and belongs to the technical field of high polymer alloy materials. The high-rigidity high-transparency polypropylene composite material is compounded by 2-4wt% of nanoscale barium sulfate master batch, 0.1-0.3wt% p-tertiary butyl hydroxyl aluminum benzoate and 0.1-0.3wt% sorbitol acetal as a nucleating agent of polypropylene. According to the high-rigidity high-transparency polypropylene composite material, the nanoscale barium sulfate master batch is added to achieve a certain compatible effect on two nucleating agents, so that the two nucleating agents are prevented from resisting against each other; and meanwhile, the effects of nucleating heterogeneously, promoting the polypropylene to quicken crystallization and refining spherocrystal effects are achieved, so that the rigidity and the transparency of a PP (polypropylene) product are further improved.

The invention relates to a high-toughness and high-heatproof glass fiber reinforced PBT (Polybutylece Terephthalate) composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 100 parts of PBT, 5-10 parts of reactive impact modifier, 3-5 parts of nucleating agent, 15-30 parts of glass fiber and 0.5-1 part of processing aid, wherein the reactive impact modifier is a compound of a toughening agent with reactive groups and a PBT thickening agent, and the mass ratio of the toughening agent with the reactive groups to the PBT thickening agent is (3:2)-(4:1). Compared with the prior art, the high-toughness and high-heatproof glass fiber reinforced PBT composite material has the advantages that the reactive impact modifier is prepared by compounding the PBT thickening agent and the toughening agent with the reactive groups, and the super-toughening of the PBT material is realized through reactive blending extrusion from the perspectives of a molecular chain and the external toughening of a reactive toughening agent. PBT crystal grains can be refined through the introduction of the nucleating agent, so that the toughness of the material is improved; and meanwhile, the nucleating agent plays a heterogeneous nucleation role, so that the crystallinity of PBT can be increased, and furthermore, the thermal property is greatly improved.

The invention provides a low-residual solvent polypropylene flexible package thin film and a preparation technology of the low-residual solvent polypropylene flexible package thin film, belonging to the technical field of package thin films. Polypropylene modified master batch comprises SiO2/EVA (ethylvinylacetate) auxiliaries, PP (propene polymer)-g-GMA (glycidyl methacrylate)/PS (poly styrene) and polypropylene. The preparation technology comprises the following steps of: mechanically mixing; and carrying out melt blending by a twin-screw extruder at 160-225 DEG C. The acrylic resin and the polypropylene modified master batch are jointly blown into the low-residual solvent polypropylene flexible package thin film. According to the thin film provided by the invention, the residual value of the weak-polarity solvent, i.e. the toluene, the ethyl acetate and the like, in printed BOPP (biaxially-oriented polypropylene) can be reduced, and the residual value to the high-polarity solvent, i.e. ketone, alcohol and the like, can be greatly reduced as well.

The invention discloses a gadolinium-holmium ion-implanted nickel-plating neodymium-iron-boron magnet, prepared from the following components by mass percent: 25-35% of Pr-Nd, 0.5-1.5% of B, 0.1-1% of Al, 0-0.2% of Cu, 1-2% of Co, 0.1-1% of Ga, 0.02-0.08% of Nb, 0.01-0.05% of Zr, 0.1-1% of mesoporous silica, and the balance of Fe and a small amount of inevitable impurities. The sintered neodymium-iron-boron magnet is uniform in crystal structure; an area close to the core of the magnet is lower in content of heavy rare earth, so that the residual magnetism of the magnet is enabled basically not to be influenced; an area close to the surface of the magnet is higher in content of the heavy rare earth, so that the coercive force of the magnet is remarkably improved; therefore, the disadvantages of the sintered neodymium-iron-boron magnet are comprehensively overcome, and the advantages of the sintered neodymium-iron-boron magnet are greatly improved.

The invention belongs to the technical field of materials, and relates to a manufacturing method of nano-copper antibacterial and antiviral melt-blown cloth master batch. The method comprises the following steps of mixing and hybridizing graphene, nano-copper, microporous silicon dioxide and a nano-microcapsule wrapping material to obtain a nano-microcapsule-coated graphene composite material; and mixing and melting the nano-microcapsule-coated graphene composite material and a polypropylene material, and carrying out extrusion granulation to obtain the nano-copper antibacterial and antiviral melt-blown cloth master batch. The invention also relates to application of the nano-copper antibacterial and antiviral melt-blown cloth master batch obtained by the preparation method in melt-blown cloth with antibacterial and virus-inactivating properties. According to the method and application, the nano-copper is used as an antibacterial auxiliary agent to form the nano-microcapsule-coated graphene composite material, and the nano-microcapsule-coated graphene composite material and the polypropylene material form the melt-blown non-woven fabric master batch so that the nano-copper can be firmly embedded in a polyester fiber molecular structure to form a non-dissolution type antibacterial fiber, and then the fiber and the non-woven fabric obtain continuous antibacterial property.

The invention discloses a dysprosium-yttrium ion implanted galvanized neodymium-iron-boron magnet, which consists of the following components in percentage by mass: 25 to 35 percent of Pr-Nd, 0.5 to 1.5 percent of B, 0.1 to 1 percent of Al, 0 to 0.2 percent of Cu, 1 to 2 percent of Co, 0.1 to 1 percent of Ga, 0.02 to 0.08 percent of Nb, 0.01 to 0.05 percent of Zr, 0.1 to 1 percent of mesoporous silica and the balance of Fe and inevitable impurities in a material. The produced sintered neodymium-iron-boron magnet is uniform in crystal structure; the heavy rare earth content of an area close to a core of the magnet is slightly low, so that influence on the residual magnetism of the magnet is substantially avoided; the heavy rare earth content of an area close to the surface of the magnet is slightly high, so that the coercivity of the magnet is remarkably improved, the shortcomings of the sintered neodymium-iron-boron magnet are comprehensively overcome, and the advantages of the sintered neodymium-iron-boron magnet are greatly improved.

The invention belongs to the technical field of polyformaldehyde ropes, and particularly relates to a preparation process of a graphene reinforced polyformaldehyde rope. The preparation process comprises the following steps: S1, taking the following raw materials in parts by weight: 60-72 parts of polyformaldehyde, 22-26 parts of high-molecular polyethylene, 3-7 parts of carbon fibers, 0.1-0.3 part of graphene, 2-5 parts of a dispersant, 0.2-0.4 part of an ultraviolet ray absorber, 0.1-0.3 part of a reinforcing agent, and 0.6-1 part of an antioxidant. According to the preparation process, the polyformaldehyde, high-molecular polyethylene, carbon fibers and graphene are used as main raw materials, so that the polyformaldehyde rope has the characteristics of high modulus, high toughness and high wear resistance, and also has good high-temperature resistance; the graphene plays a role in heterogeneous nucleation of the polyformaldehyde, so that the polyformaldehyde rope has high tensile strength and excellent mechanical properties, the strength and wear resistance of polyformaldehyde fibers are further improved, graphene layers can be separated and prevented from gathering, and thus the graphene is dispersed more uniformly.

The invention provides a preparation method of a PPy (polypyrrole)-PCL (polycaprolactone) antibacterial nanocomposite film. The preparation method comprises steps as follows: PPy surface modified LDHs(layered double hydroxides) clay antibacterial powder (LDHs@PPy) is obtained from PPy coated LDHs clay formed through a chemical oxidation reaction of Py (pyrrole) on the surface of the LDHs clay under the initiation function of soluble Fe<3+> salt; then, a LDHs@PPy/PCL nanocomposite film is prepared from LDHs@PPy and PCL through solution pouring. The interfacial compatibility and the binding force between LDHs and a substrate PCL are increased by a surface organic coating PPy, the blocking property, the mechanical performance and the like of the final nanocomposite are improved, the composite film is endowed with antibacterial performance, and the application of the surface modified LDHs clay/bio-based polymer composite in the field of active packaging is finally extended. The preparation method is simple and is suitable for large-scale production, and conditions are easy to control.

The invention relates to the technical field of new material processing, and discloses a preparation method of a corrosion-resistant chemical barrel material. According to the preparation method, nanometer ceramic material modified polypropylene composite plastic is used for preparing a chemical barrel material master batch; chemical reaction between a corrosive medium and the surface of the chemical barrel material is prevented; a interface structure is protected; excellent performances of corrosion resistance, wear resistance, low relative density and the like are realized; the preparationmethod can be used for plastic enhancement, and the effect of promoting plasticization can also be achieved; after being treated and added into the polypropylene blended plastic, the corrosion-resistant chemical barrel material has an excellent reinforcing effect, the material microstructure can greatly improve the corrosion resistance, mechanical properties and aging resistance of blended materials, the corrosion-resistant chemical barrel material can be well dispersed in the blended materials, and the chemical properties are basically kept stable after immersion in corrosive liquid for a long time.

The invention discloses a high-brightness black composite nylon material and a preparation method thereof. The high-brightness black composite nylon material is prepared from the following raw materials in parts by weight: 65-90 parts of nylon 6, 10-35 parts of nylon 56, 0.1-1 part of a functional nucleating agent, 0.15-0.6 part of carbon black and 0.4-1 part of an auxiliary agent, the functional nucleating agent is a polyamide-amine dendrimer grafted carboxylated carbon nano tube. The high-brightness black composite nylon material prepared by the invention has the advantages of low cost, good appearance and scratch resistance, meets the performance requirements of good appearance and scratch resistance when the high-brightness black composite nylon material is applied to automobile exterior trimming, and meanwhile, compared with a high-brightness black material which takes special nylon as a matrix in the market at present, the high-brightness black composite nylon material has the advantages of low cost, good appearance and scratch resistance. The obvious price advantage is realized.

The invention discloses a mesoporous-material-added zinc-plated neodymium-iron-boron magnet which is composed of the following components in percentage by mass: 25-35% of Pr-Nd, 1-2% of B, 0.1-1% of Al, 0-0.2% of Cu, 1-2% of Co, 0.1-0.3% of Ga, 0.1-1% of Nb, 0-0.1% of Zr, 0.1-1% of mesoporous silicon dioxide, and the balance of Fe and small amounts of inevitable impurities in the material. By starting with the neodymium-iron-boron magnet raw material powder ground by an air flow grinder, the micron-sized raw material powder is directly coated and plated by zinc, thereby enhancing the oxidation resistance of the neodymium-iron-boron raw material. By adding the mesoporous silicon dioxide, the nano component and neodymium-iron-boron magnet main phase are compounded into the grain boundary phase, thereby enhancing the coercivity of the magnet on the premise of keeping the magnetic remanence basically constant; and the produced neodymium-iron-boron magnet has the advantages of uniform crystal form structure, excellent corrosion resistance, obviously higher machinability, excellent oxidation resistance and high coercivity.

The invention discloses a preparation method of a modified polyester chip and a polyester film. The method comprises the following steps: dispersing POSS-octahydroxy propyl dimethyl silicon in ethylene glycol, performing ultrasonic dispersion, then mixing with terephthalic acid, biphenyl dicarboxylic acid, 1, 2-propylene glycol, zinc acetate and ethylene glycol antimony, controlling the molar ratio of alcohol to acid to be not less than 1.5: 1, heating to 230-240 DEG C until the water yield reaches 95% or above of a theoretical value, vacuumizing for the first time, heating to 260-265 DEG C, carrying out constant-temperature and constant-pressure reaction for 1-2 hours, vacuumizing for the second time to increase the vacuum degree, carrying out constant-temperature and constant-pressure reaction for 0.5-1 hour at 265-275 DEG C, reducing the pressure, discharging, cooling and granulating to prepare the modified polyester chip. The prepared polyester chip can be used for preparing a biaxially oriented polyester film, and has good mechanical properties and optical properties.

The invention discloses a gadolinium/yttrium-ion-implanted zinc-plated neodymium-iron-boron magnet which is composed of the following components in percentage by mass: 25-35% of Pr-Nd, 0.5-1.5% of B, 0.1-1% of Al, 0-0.2% of Cu, 1-2% of Co, 0.1-1% of Ga, 0.02-0.08% of Nb, 0.01-0.05% of Zr, 0.1-1% of mesoporous silicon dioxide, and the balance of Fe and small amounts of inevitable impurities in the material. The sintered neodymium-iron-boron magnet has uniform crystal form structure; the heavy rare earth content in the region adjacent to the magnet core is lower, thereby preventing the magnetic remanence of the magnet from being influenced basically; the heavy rare earth content in the region adjacent to the magnet surface is higher, thereby obviously enhancing the coercivity of the magnet; and the defects of the neodymium-iron-boron sintered magnet are comprehensively improved, and the advantages are greatly enhanced.

The invention discloses a transparent nucleating agent master batch for blow molding PE and a preparation method of the transparent nucleating agent master batch. The transparent nucleating agent master batch for blow molding PE is prepared from the following components in parts by weight: 60-80 parts of polyethylene, 12-28 parts of nano butadiene styrene rubber, 3-7 parts of nano silicon dioxide, 0.1-0.5 part of an antioxidant, 0.1-0.3 part of a lubricant and 0.1-0.3 part of a dispersing agent. When the prepared transparent nucleating agent master batch for blow molding is added into blow molding PE, the spherocrystal size of polyethylene resin is reduced, and the structure is finer and more uniform, so that the crystallization temperature of a blow molding PE film is remarkably improved, the transparency is improved, and the haze is reduced. The film has the characteristics of high transparency and low haze, and can be widely applied to the requirements of various film products.

The invention relates to a talcum powder-polyester composite material and a preparation method thereof. The method comprises: (1) mixing 1 part by weight of a coupling agent, 10-100 parts by weight of glycol and 0.1-10 parts by weight of water, adjusting a pH value to 1-6 with acid, and hydrolyzing for 0-1 hour; (2) mixing the coupling agent hydrolysate and 30-1000 parts by weight of the talcum powder for 5 minutes to obtain the active talcum powder; and (3) mixing 0.1-10 parts by weight of the active talcum powder, 70-80 parts by weight of terephthalic acid and 20-30 parts by weight of the glycol with stirring, adding 0.01-1 part by weight of a catalyst, heating to 70-90 DEG C, dehydrating under vacuum until the water content is less than 1.0 %, re-heating to 220-240 DEG C, esterifying for 6-10 hours, adding 0.01-1 part by weight of an additive, vacuumizing to a vacuum degree of 80 Pa or less under a temperature of 240-260 DEG C, and polymerizing for 1-3 hours to obtain the product.

The invention relates to the field of high polymer materials, and discloses a PET auxiliary agent, a synthesis method thereof and an application of the PET auxiliary agent in improvement of mechanical properties of recycled PET, and the PET auxiliary agent is synthesized by reacting dibenzylidene sorbitol and long-carbon-chain lignite wax acid under catalysis of dimethylaminopyridine. A synthetic method of a PET auxiliary agent comprises the following steps: step I, dispersing dibenzylidene sorbitol in xylene, adding long-carbon-chain montan wax acid and dimethylaminopyridine, and carrying out a reaction; and II, after the reaction is finished, carrying out suction filtration, washing and drying to obtain the target PET auxiliary agent. The PET auxiliary agent can be used as a mechanical property accelerant for recovering PET, and the straight-chain molecular structure of the long carbon chain part can promote the addition and rearrangement of the molecular chain in the crystallization process of the recovered PET and the epiphytic crystallization around the long carbon chain, so that the crystallization promoting effect of the dibenzylidene sorbitol part is further enhanced; the recycled PET is induced to generate microcrystals or shish-kebab, so that the mechanical property of the recycled PET is improved.

The invention discloses a high-brightness black nylon material as well as a preparation method and application thereof. The high-brightness black nylon material is specifically prepared from the following raw materials in parts by weight: 97 to 99 parts of nylon resin, 0.1 to 1 part of functional nucleating agent, 0.15 to 0.6 part of carbon black and 0.4 to 1 part of auxiliary agent, the functional nucleating agent is a polyamide-amine dendrimer grafted carboxylated carbon nano tube. The high-brightness black nylon material prepared by the invention has good appearance and solvent resistance, meets the performance requirement of good appearance when the high-brightness black nylon material is simultaneously applied to automotive interiors, and has good solvent resistance at the same time.

The invention discloses a propeller rapid prototyping process, which comprises the following steps: copper alloy smelting; pouring; grinding; and weight measurement. Compared with the prior art, the invention has the advantages of high efficiency, corrosion resistance and the like.