193results about How to "Fast crystallization rate" patented technology

The invention relates to a method of synthesizing Beta molecular sieve without organic templates, which belongs to the technical field of catalytic chemistry. The steps of the invention comprise mixing alkali oxide sources, alumina sources, silica sources and water, stirring and synthesizing initial silica-alumina gel, then adding with Beta zeolite crystal seed, crystallizing 12-24 hours under the temperature of 100-180 DEG C and hydro-thermally synthesizing the Beta molecular sieve, SiO2/Al2O3 of the Beta zeolite crystal seed equals 22-25, and the quality of addition quantity is 5%-20% of the silica sources. The method of the invention suits requirements of applying zeolite molecular sieve in industry, not only can directly synthesize high crystallinity crystal of the Beta molecular, but also can increase crystallizing speed of the molecular and reduce manufacturing cost. Because the synthesis process doesn't use any organic templates without roasting, thereby a pore path is unimpeded, and environmental pollution and relatively consumption are avoided.

The invention relates to a method for preparing a SAPO molecular sieve and mainly solves the problem that the SAPO molecular sieve has low crystallization speed and low production capacity in the prior art. The method comprises the following steps: (a) evenly mixing a phosphorous source, an aluminum source, a silicon source and water to form a crystallized solution I; (b) adding small-grain solid seed crystals with the diameter of the crystals being less than 1 micron to the crystallized solution I to form a crystallized solution II; (c) subjecting the crystallized solution II to hydrothermal crystallization at the temperature of 110 DEG C to 260 DEG C for at least 0.1 hours to obtain the SAPO molecular sieve; and d) recycling the molecular sieve product. By the technical proposal, the problem in the prior art is well solved, so that the method can be used in the process of preparing alkenes catalyst with oxygenated chemicals.

The invention discloses a glass fiber enhanced PET/PBT (Polyethylene Terephthalate)/(Polybutylene Terephthalate) alloy with high glossiness and low warping degree and a preparation method thereof. The PET/PBT alloy comprises the following components by mass percentage content: 15-60% of PBT, 19-60% of PET, 3-10% of compatilizer, 0.3-0.9% of antioxygen, 0.5-1% of nucleating accelerating agent, 3-8% of composite nucleating agent, 10-30% of glass fiber and 0.4-1% of processing aid. According to the invention, the PET and the PBT are fused to obtain the PET/PBT alloy, and the PET/PBT alloy has the advantages of quick crystallizing speed rate, good physical performance, high distortion temperature, high surface glossiness, low contractibility rate, stable dimension, low warping degree and lower cost; and the PET/PBT alloy of the invention can be used for completely replacing the bakelite powder under a specific occasion.

The invention provides a preparation method of a SAPO-34 molecular sieve membrane. The method is characterized in that a specific zeolite molecular sieve is employed as a silicon source. A continuous compact SAPO-34 molecular sieve thin film is formed on a surface of a porous ceramic supporting body, namely, a layer of the SAPO-34 molecular sieve membrane is grown on the porous ceramic supporting body with a crystalline state zeolite molecular sieve being the silicon source. A structure unit of the molecular sieve is same as that of SAPO-34. Crystal nucleus are provided for crystallization of a SAPO-34 molecular sieve and a synthesis time of the membrane is shortened. In addition, the content of silicon in the SAPO-34 molecular sieve membrane can be adjusted within a large range. The membrane has a preferable selectivity on CO2 and a high permeation flux and separation selectivity when being used for separating mixing systems of CO2/CH4.

The invention discloses crystalline copolymer polyimide resin low in melt viscosity and prone to melt processing. The crystalline copolymer polyimide resin is prepared from aromatic dianhydride monomers, aromatic diamine monomers and capping agent by means of condensation polymerization, mixtures of 3,3',4,4'-triphenyldiether tetracarboxylic acid dianhydride and other dianhydrides are taken as aromatic dianhydride monomers, and phthalic anhydride is taken as capping agent. The copolymer polyimide resin has high glass transition temperature, good heat stability, low melt viscosity, excellent repeated melt crystallization capacity and easy-melting processability, the melting range is 320-380 DEG C, and the polymer has broad application in preparation of materials such as composite material matrix resin, high-temperature adhesives, powder coating, high-performance films, 3D-printing polymer powder and the like.

The invention discloses a polylactic resin composition with high heat resistance and high flexibility and a preparation method of the composition, solving the problem that polylactic resin with high heat resistance and high flexibility does not exist in the prior art. The polylactic resin composition consists of the following components in parts by weight: 50 to 99.5 weight parts of poly-L-lactic acid homopolymer and 0.5 to 50 weight parts of poly-D-lactic acid copolymer, wherein the poly-D-lactic acid copolymer is prepared from poly-D-lactic acid and a polymer with a flexible chain structure. The invention also provides the preparation method of the polylactic resin composition with high heat resistance and high flexibility. The preparation method is simple and suitable for industrialized production; and the prepared polylactic resin composition has high flexibility and heat resistance, the elongation at break reaches 16 percent, the notch impact strength reaches 12.2kJ/m<2>, and the vicat softening temperature reaches 113 DEG C.

The invention discloses a polylactic acid/cellulose bio-based degradable composite material and a preparation method thereof. The polylactic acid/cellulose bio-based degradable composite material is prepared from the following raw materials in parts by weight: 40-85 parts of polylactic acid, 5-25 parts of a dextral polylactic acid-type polyurethane elastomer, 2-10 parts of maleic anhydride graftedpolylactic acid and 10-50 parts of cellulose, wherein the number average molecular weight of the polylactic acid is 100000-300000. The polylactic acid/cellulose bio-based degradable composite material is safe, non-toxic, biodegradable and excellent in mechanical properties. The preparation method comprises the following steps: uniformly mixing components, then adding into a twin-screw extruder, performing melt blending, drawing into strips, pelletizing, and drying to obtain the composite material. The preparation method is simple, easy to control, strong in operability and easy to implement,the production cost is low, and the industrial mass production is easy; the prepared composite material can be applied to the field of interior trim parts, films, fibers or other specially shaped materials and the like.

The invention relates to three-dimensional order mono-disperse macropore material and its preparation method and functionalizing method. The three-dimensional order mono-disperse macropore material has 91%-98% syndiotactic polyvinyl alcohol arene, 80 nm-1000 nm average aperture. Its preparation method includes the following steps: using colloid crystal mold board method to make three-dimensional order mono-disperse macropore polyvinyl alcohol without water and oxygen by coordination polymerization; using copolymerization or chloromethylation to functionalize. It has the advantages of high melting point, quick crystallization rate, strong chemical resistance, good size stability, processing surface chemical modification, and wide application prospect in sensor, photon chip, photon band gap material preparation etc.

The invention discloses a multilayer nanometer composite phase-transition thin film material and a preparation method and application thereof. The material is formed by arranging Sn2Se3 film layers and Sb film layers alternatively, one Sn2Se3 film layer and one Sb film layer serve as an alternative period, and the Sn2Se3 layer in the latter alternative period is deposited on the Sb layer in the former alternative period. A general formula of the film structure of the film material is [Sn2Se3(a)/Sb(b)]x, a represents the thickness of the single Sn2Se3 film layer, b represents the thickness of the single Sb film layer, a is greater than or equivalent to 1nm and lower than or equivalent to 50nm, b is greater than or equivalent to 1nm and lower than or equivalent to 50nm, x represents the number of alternative periods or layers of the Sn2Se3 film layers and Sb film layers, and x is a positive integer. The phase-transition thin film material uses Sb as a crystallization induction layer to accelerate phase transition of the phase-transition material, and advantages of low melting point and high thermal stability of Sn2Se3 are used; and the clamping effect of multiple interfaces in the multilayer nanometer composite structure is used to reduce the size of crystal grains, and further to shorten the crystallization time, inhibit crystallization, improve the thermal stability and accelerate phase transition.

The invention belongs to the field of molecular sieve catalytic materials and discloses a pentasil type zeolite molecular sieve synthetic method. The pentasil type zeolite molecular sieve synthetic method comprises the following steps of mixing an aluminum-source compound, an alkali-source compound, a silicon-source compound, an additive, an organic template agent and water, and uniformly stirring to form a reaction mixture; and carrying out hydrothermal crystallization, filtering, washing and drying to obtain pentasil type zeolite molecular sieve, wherein the additive is polyether type compound. The pentasil type zeolite molecular sieve synthetic method disclosed by the invention has the advantages of high crystallization speed, low cost, low template agent consumption and the like, and the synthesized pentasil type zeolite molecular sieve has high degree of crystallinity and purity.

The invention provides a grease composition. The grease composition comprises, based on the weight of total triglycerides, more than 25.5 wt% of 1,2-disaturated-3-unsaturated triglyceride (SSU), more than 33.1% of 1,2-diunsaturated-3-saturated triglyceride (UUS), more than 9.2 wt% of trisaturated triglyceride (SSS), and less than 10 wt% of triunsaturated triglyceride (UUU), wherein the S is saturated fatty acid and the U is unsaturated fatty acid. The invention also provides a preparation method of a plastic grease product. The method includes subjecting the grease composition to rapid cooling, kneading and curing processing. The plastic grease product prepared by the method has advantages of wide plasticity temperature range, high crystallization rate, high expansion rate, and the like.

The invention belongs to the field of semiconductor materials, and discloses an Si-Sb-Se nano phase-change thin film material. A general formula of a chemical composition of the phase-change thin film material is Si<x>(Sb<2>Se)<1-x>, wherein x is smaller than 0.50 and greater than or equal to 0.05; the proportion of an ingredient Si in the Si<x>(Sb<2>Se)<1-x> is controlled through the diameters of stacked Si sheets; and the Si-Sb-Se nano phase-change thin film material is formed by deposition through a room-temperature high-vacuum magnetron sputtering method. The Si-Sb-Se nano phase-change thin film material provided by the invention does not contain a Te element and belongs to an environment-friendly material; and meanwhile, Si-Sb-Se also has ultra-high thermal stability, relatively low power consumption and a high phase change speed, is an ideal phase-change storage material and has a relatively good market application prospect.

The invention relates to an antimony-germanium multilayer nano-composite phase-change material and preparation and application thereof. The composite phase-change material comprises a multilayer film structure formed by alternative arrangement of Sb films and Ge films, the thickness of the Sb film is 1-3 nm, and the thickness of the Ge film is 0.5-3.5 nm. By employing a magnetron sputtering method, multiple layers of Sb films and Ge films are alternatively deposited on a SiO2/Si (100) substrate by regarding Sb and Ge as sputtering target materials and regarding Ar as the sputtering gas, and the Sb/Ge nano-composite multilayer phase-change film material is obtained. Compared with the prior art, according to the Sb/Ge nano-composite multilayer phase-change film, the thermal stability is high, and the saving time of data can be increased; crystalline and amorphous resistances are higher, and the operation power consumption of a PCRAM can be reduced; and compared with the conventional phase-change storage material, the thermal stability is improved, and the crystallization speed is accelerated.

The invention discloses an SiO2 doped Sb nano phase change film material, and a preparation method and an application of the film material. A chemical composition of the SiO2 doped Sb nano phase change film material is (SiO2)xSb1-x, wherein x is greater than or equal to 0.22 and less than or equal to 0.40; and the film material is deposited by a magnetron sputtering method. The prepared SiO2 doped Sb nano phase change film material has a high crystallization temperature, can effectively improve thermal stability of a PCRAM (Phase Change Random Access Memory), has a high crystallization speed, and can greatly increase a memory speed of the PCRAM.

The invention discloses a Raney Ni catalyst suitable for methanation of a fixed bed. The Raney Ni catalyst is characterized in that the Ni content is 86wt%-95wt% and the specific surface area is between 85 and 180 m<2>/g. The Raney Ni catalyst suitable for methanation of the fixed bed has the advantages that the particle size is uniform, the mechanical strength is high, the catalytic activity is good and the Raney Ni catalyst is suitable for large-scale production.

The invention provides a preparation method of a polylactide-type polyurethane-modified polylactic acid alloy. The preparation method comprises the following steps: a. dissolving D-polylactide polylol, diisocyanate and a catalyst in a mole ratio of 1:(3-5):(0.001-0.01) in a solvent, and reacting in a protective gas atmosphere at 50-100 DEG C to obtain a prepolymer; b. adding a chain extender into the prepolymer, and carrying out chain extension to obtain a D-polylactide polylol polyurethane elastomer, wherein the mole ratio of the chain extender to the D-polylactide polylol is (2-4):1; and c. premixing 60-99.5 parts by mass of polylactic acid and 0.5-40 parts by mass of D-polylactide polylol polyurethane elastomer, and carrying out melt extrusion at 175-190 DEG C through a double-screw extruder. The invention also provides a polylactide-type polyurethane-modified polylactic acid alloy.

The invention discloses a SbSe-based nitrogen-doped nano-film material for a PCRAM (Phase-Change Random Access Memory) and a preparation method for the SbSe-based nitrogen-doped nano-film material. The general formula of the chemical composition of the nano-film material is (Sb<70>Se<30>)<x>N<1-x>, wherein x is equal to 0.69-0.75. Compared with the conventional Ge2Sb2Te5 phase-change film material, the SbSe-based nitrogen-doped nano-film material for the PCRAM disclosed by the invention is higher in crystallization speed; the storage speed of PCRAM can be greatly improved; meanwhile, the film material disclosed by the invention is higher in crystallization temperature and activation energy, so that the stability of the PCRAM can be greatly improved. The content of nitrogen in the SbSe-based nitrogen-doped nano-film material is controlled by controlling the flow rate of the introduced nitrogen when magnetron sputtering is performed, so that the content of the nitrogen can be controlled accurately.