51results about How to "Narrow melting range" patented technology

The invention relates to novel adhesive alpha-olefin inter-polymers which are largely amorphous and have a Theological behavior that makes them suitable for adhesive use, both without and with minimzed amounts of tackifying resins. Specifically, the invention poly-alpha olefin inter-polymer may be composed of A) from 60 to 94 % of units derived from one alpha mono-olefin having from 3 to 6 carbon atoms and B) from 6 to 40 mol % of units derived from one or more other mono-olefins having from 4 to 10 carbon atoms and at least one carbon atom more than A); and C) optionally from 0 to 10 mol % of units derived from another copolymerizable unsaturated hydrocarbon, different from A) and B); the diad distribution of component A in the polymer as determined by 13C NMR as described herein showing a ratio of experimentally determined diad distribution over the calculated Bernoullian diad distribution of less than 1.07; and the storage modulus G' of said polymer, determined upon cooling as described herein, intersecting a value of 3.105 Pa at a temperature of less than 85 ° C. The invention also describes polymerization processes suitable for the manufacture of these adhesive alpha-olefin inter-polymers.

The present invention belongs to the field of aluminum and aluminum alloy connecting material, relates to aluminum brazing material, and is especially one kind of fast cooled Al-Si-Cu-Zn brazing material for brazing aluminum and aluminum alloy and its preparation process. The Al-Si-Cu-Zn brazing material consists of Si 5.0-12.5 wt%, Cu 15.0-30.0 wt%, Zn 2.5-7.5 wt%, Sr 0.001-0.5 wt% and Al for the rest. The Al-Si-Cu-Zn brazing material is prepared through one single roll and fast cooling process. It has melting temperature of 500-525 deg.c and brazing temperature of 530-570 deg.c, and is suitable for brazing aluminum and aluminum alloy with solidus temperature over 530 deg.c.

The invention relates to a high plasticity environment protection silver-saving intermediate temperature solder in which an intermediate temperature solder is used to replace the silver copper zinc cadmium solder with high content of silver, and a processing technology thereof. Aiming at the defects of the prior silver solder which contains cadmium and lead such as the heavy pollution to environment, the hazard of the cadmium and lead to human body, large brittleness of solder alloy and high cost and so on, the purpose of the invention is to provide a cadmium-free and lead-free high plasticity environment protection silver-saving intermediate temperature solder with low cost, small brittleness of solder alloy, comparatively low melting temperature and comparatively small melting range. The high plasticity environment protection silver-saving intermediate temperature solder of the invention comprises Cu, Sn, P, Ni, Ag, Li and La; wherein, Li and Na are active microelements. The preparation steps of the high plasticity environment protection silver-saving intermediate temperature solder of the invention are that raw materials are weighted by formula; the solder alloy is refined into solder ingot castings which are made into filamentous solders by hot-pressing. The filamentous solder can be made into sizes of solder coiling wire, solder straight wire and solder welding ring.

The invention discloses a boracic Cu-P-based amorphous brazing filler metal and a method for preparing the same, which belong to the technical field of the brazing of amorphous brazing filler metal and copper as well as copper alloy. The amorphous brazing filler metal comprises the following components in percentage by weight: 7.2 percent of P, 14.0 percent of Ni, 5.4 percent of Sn, 0.02 to 0.04 percent of B, 0.2 percent of Si, and the balance of Cu. The amorphous brazing filler metal is prepared by adopting a rapid solidification technique, and the prepared brazing filler metal has a bright and clean surface, two smooth sides and better toughness. The melting temperature of the amorphous brazing filler metal is between 602 and 663 DEG C and the brazing temperature is between 670 and 720 DEG C. The amorphous brazing filler metal is applicable to the brazing of the copper and the copper alloy, and applicable brazing process methods comprise flame brazing, furnace brazing, gas shield brazing, salt bath brazing, and the like. By adopting the amorphous brazing filler metal to perform flame brazing of red copper, the wetting property of the brazing filler metal is obviously better than the brazing filler metal with same components prepared by a conventional melting technique, and the shear strength of a brazed joint is more than 112 MPa.

A method for preparing spinnable pitch from coal tar pitch comprises the following steps: crushing medium-low-temperature coal tar pitch to 20 meshes or below, performing extracting by using tetrahydrofuran, performing filtration to obtain a medium-low-temperature coal tar pitch soluble component, and recovering the tetrahydrofuran solvent from the soluble component to obtain refined pitch; and mixing the refined pitch with petrolatum, adding the obtained mixture into a reactor, introducing nitrogen under normal pressure, heating the reactor to 180-220 DEG C at a heating rate of 1-10 DEG C/min, switching to air, introducing the air into the reactor at a rate of 10-60 mL/min.g, heating the reactor to 280-350 DEG C at a heating rate of 1-10 DEG C/min, and allowing the obtained mixture to stay for 1-10 h to obtain the spinnable pitch. The method has the advantages of high yield, low price and moderate thermal polycondensation temperature.

The invention relates to a method for synthesizing a dianhydride monomer, in particular to a method for synthesizing an aromatic HQEDA monomer. The method adopts a 3(4) substituted phthalimide to prepare HQEDA and provides novel middle steps for preparing the HQEDA. The method comprises the following steps: preparing a 3 (4) substituted-N-alkyl (aryl) phthalimide from the 3(4) substituted phthalimide through Gabriel reaction principle or by adding a salifying agent and halocarbon into an apolar aprotic solvent to react; and using the prepared 3 (4) substituted-N-alkyl (aryl) phthalimide to prepare bis imide and the bis ether anhydride. The method has the advantages that raw materials are easily available, preparation method is simple and easy to operate, and the purity and yield of the prepared 3 (4) substituted-N-alkyl (aryl) phthalimide are obviously higher than that of the prior method.

The invention discloses a chemical structure of a phosphonitrile fire retardant, and discloses a preparation method of the phosphonitrile fire retardant. The method comprises the following steps: (a) dissolving phosphonitrilic chloride trimer and an acid-binding agent into an organic solvent, introducing N2 for protecting, stirring evenly to obtain a mixed solution, dropwise adding n-octylamine or lauryl amine to the mixed solution when stirring, carrying out reflux reaction at 50-80 DEG C for 9-12 hours after dropwise adding is ended, so as to obtain reaction liquid; and (b) cooling the reaction liquid, standing and separating a target product, and drying to obtain a phosphonitrile fire retardant. Meanwhile, the invention also discloses a composite material which is prepared from the prepared fire retardant added to EVA and is excellent in flame retardant property and mechanical performance. According to the novel phosphonitrile fire retardant developed by the method, the preparation method is simple and easy to operate; the prepared aliphatic amine-substituted phosphonitrile compound is narrow in melting range, high in purity and good in processability; and the composite material prepared by compounding with EVA can be widely used as a cable raw material.

A solid ink includes an ink vehicle that is solid at room temperature, including a ketone wax and at least one resin selected from a branched amide resin, a branched urea resin, and a branched urethane resin, a colorant, and optional additives.

The invention relates to a laser sintering rapidly shaping powder material and preparation and application methods thereof, belongs to the field of rapidly shaping high-polymer materials and particularly relates to a selective laser sintering polyimide powder material and a preparation method thereof. The selective laser sintering polyimide powder material is composed of raw materials including, by weight part, 70-100 parts of crystalline polyimide resin, 0-30 parts of nanometer inorganic filler, 0.1-5 parts of polyphenylene sulfide resin and 0.1-3 parts of antioxidant. The selective laser sintering polyimide powder material can facilitate layering during a printing process; 3D (three-dimensional) products printed by the selective laser sintering polyimide powder material can be continuously applied at 330-380 DEG C.

The invention relates to novel adhesive alpha-olefin inter-polymers which are largely amorphous and have a rheological behavior that makes them suitable for adhesive use, both without and with minimzed amounts of tackifying resins. Specifically, the invention poly-alpha olefin inter-polymer may be composed of A) from 60 to 94% of units derived from one alpha mono-olefin having from 3 to 6 carbon atoms and B) from 6 to 40 mol % of units derived from one or more other mono-olefins having from 4 to 10 carbon atoms and at least one carbon atom more than A); and C) optionally from 0 to 10 mol % of units derived from another copolymerizable unsaturated hydrocarbon, different from A) and B); the diad distribution of component A in the polymer as determined by ¹³C NMR as described herein showing a ratio of experimentally determined diad distribution over the calculated Bernoullian diad distribution of less than 1.07; and the storage modulus G′ of said polymer, determined upon cooling as described herein, intersecting a value of 3.10⁵ Pa at a temperature of less than 85° C. The invention also describes polymerization processes suitable for the manufacture of these adhesive alpha-olefin inter-polymers.

A granule-based wax sweating method comprises the following steps: (1) filling water to the bottom part of a sweating device; (2) heating paraffin to a liquid state, adding sweating granules, and thenadding the mixture in the sweating device; (3) cooling the paraffin to be 10 to 20 DEG C lower than a melting point at the speed of 1 to 4 DEG C/h; (4) releasing the water, pumping warm water to a sweating tank, heating at the speed of 0.5 to 2 DEG C/h, and collecting the paraffin which can sweat at different melting points; (5) melting the paraffin after finishing heating, and enabling a moltenhigh-melting-point paraffin product to flow into an intermediate tank; (6) blowing residual sweating granules and the last one distillate in the sweating tank by using steam, filtering and separatingthe sweating granules and the distillate, and recycling the sweating granules. According to the granule-based wax sweating method disclosed by the invention, the compaction density of sweating raw materials is reduced, outflow of oil content and low-melting-point wax can be facilitated, the fluidity of sweating liquid is improved, and the separation effect is multiplied; meanwhile, the yield of asweating product is higher, a wax melting range is narrower, a wax product is concentrated in molecular weight, and the enthalpy value of a product is higher.

The invention belongs to the technical field of chemical engineering and particularly relates to a preparation method of vinyl distearamide. The preparation method uses stearic acid and ethylenediamine as reacting raw materials, uses a composite antioxidant prepared by compounding an antioxidant 1076, an antioxidant DLTDP and an antioxidant T501 as a reacting antioxidant and uses a composite catalyst prepared by compounding a p-Toluene sulfonic acid/SAPO-34 supported solid acid catalyst and a phosphoric acid/SiO2-Al2O3 supported solid acid catalyst as a reaction catalyst. The preparation method of the vinyl distearamide is simple in process, no 'three wastes' emission is produced in the process of preparing the vinyl distearamide, the yield is high, and the prepared vinyl distearamide is high in purity, low in chromaticity and narrow in melting range.

The invention discloses spinnable asphalt and a preparation method thereof, wherein the spinnable asphalt comprises the following raw materials in parts by weight: 20-50 parts of medium and low temperature coal pitch-based refined asphalt and 50-80 parts of petroleum asphalt. The preparation method comprises the following steps: uniformly mixing 20-50 parts by weight of medium and low temperaturecoal pitch-based refined asphalt and 50-80 parts by weight of crushed petroleum asphalt, and putting the mixture into a reactor; and introducing inert gas into the reactor under normal pressure, heating to 370-450 DEG C at a speed of 2-9 DEG C/min, and reacting for 4-9 hours to obtain spinnable asphalt. According to the invention, high aromaticity is provided through refined asphalt, the aromaticcomponents and the asphaltene in petroleum asphalt are combined to provide a small amount of aromatic rings, and saturated components and colloid provide alkyl side chains and naphthenic structures, so that the high-quality spinnable asphalt having high softening point and narrow melting range and capable of continuously spinning can be obtained, the petroleum asphalt is used for replacing a modifier, and the preparation technological process of the spinnable asphalt can be simplified.

The invention discloses a method of increasing the melting temperature of Fischer-Tropsch wax by leaching. The method comprises the following steps: step one. enabling the granular Fischer-Tropsch waxhaving the particle size of 0.01 to 5mm to contact with a solvent, wherein the weight ratio of the solvent to the granular Fischer-Tropsch wax is 20 to 0.1, the leaching temperature is 30 to 230 DEGC, and the leaching time is 10 to 300 minutes; step two. removing the solvent which is mixed in the granular Fischer-Tropsch wax after leaching, and recovering the solvent to obtain the Fischer-Tropsch wax with the high melting temperature; step three. recovering the solvent in raffinate, and meanwhile obtaining the Fischer-Tropsch wax with the low melting temperature; and step four. recycling thesolvent obtained in the step two and the step three. The method has the advantages that the energy consumption is low, high temperature and high vacuum degree are not required, the adverse impact ofhigh temperature on the performance of the Fischer-Tropsch wax is avoided, the melting temperature of the Fischer-Tropsch wax is increased, the melting range is relatively narrow, the cutting is relatively fine, and the method can meet the diversified needs of the market, the production operation is flexible, and the yield is easy to adjust.

The invention discloses a method for preparing spinnable asphalt through co-heating condensation polymerization of anhydride-modified coal asphalt and kerosene co-refining residues. The method includes the steps of pulverizing kerosene co-refining residues and medium-and-low-temperature coal asphalt to reach the granularity of 20 mesh or below, extracting and filtering out soluble components through tetrahydrofuran, recovering a solvent to obtain asphaltene A and asphaltene B, mixing the asphaltene B with benzenetetracarboxylic anhydride and maleic anhydride, introducing nitrogen at normal pressure, raising the temperature to 350-450 DEG C at the temperature rise rate of 1-10 DEG C/min, keeping the temperature for 1-10 hours, lowering the temperature to the room temperature to obtain a solid product (substrate asphalt), mixing the substrate asphalt with the asphaltene A, introducing normal-pressure nitrogen, raising the temperature to 350-400 DEG C at the temperature rise rate of 1-10DEG C/min, keeping the temperature for 1-10 hours, and lowering the temperature to the room temperature to obtain the solid product (spinnable asphalt). The modified spinnable asphalt has the advantages of being moderate in softening point, short in softening and melting range and capable of continuously preparing asphalt fiber filaments through melting and spinning.

The invention discloses medium temperature aluminum alloy brazing solder and a preparing method thereof. The medium temperature aluminum alloy brazing solder comprises, by weight proportion, 0.5-3 parts of Mg, 3-25 parts of Cu, 1-2 parts of Al and 75-95 parts of a Si intermediate alloy. The preparing method comprises the steps of raw material taking, smelting and pouring. The solder has the beneficial effects of being low in melting point (lower than 550 DEG C), narrow in fusion zone and low in welding temperature; the good spreadability, the good gap filling performance, the good wettability and the good connector comprehensiveness are achieved; and the medium temperature aluminum alloy brazing solder is suitable for vacuum brazing.

The invention relates to an MgO optimal distribution method for iron-containing furnace charge of a blast furnace. The method comprises the following steps: S1, determining that the MgO content SMg' of optimized sintered ore is less than or equal to 1.8% and the binary alkalinity (CaO/SiO2) Sb' is greater than or equal to 1.8; S2, determining that the MgO content of optimized pellets is 1.5%-2.0%and the binary alkalinity is less than or equal to 0.4, namely, PMg' is greater than or equal to 1.5% and less than or equal to 2.0%, Pb' is less than or equal to 0.4, and the charging proportion Pp'is less than or equal to 30%; S3, according to the binary alkalinity requirement Bb of the blast furnace comprehensive furnace charge and the binary alkalinity constraint condition of each iron-containing furnace charge, determining the charging proportion Pp' of the optimized pellets; S4, determining the MgO content PMg' of optimized pellets and the MgO content SMg' of optimized sintered ore according to the MgO content requirement BMg of blast furnace comprehensive furnace charge, the optimized iron-containing furnace charge proportions and the optimized iron-containing furnace charge MgO constraint conditions. The method has the advantages that the reduction degree of the comprehensive furnace charge is effectively improved, the soft melting temperature is reduced, the interval is narrowed, and the smelting performance is improved.

The invention provides a polyimide composition. The polyimide composition is prepared from 70 to 95 parts of crystalline polyimide resin, 5 to 30 parts of nano carbon material, 1 to 5 parts of polycarbonate, 0.1 to 3 parts of nano whisker and 0.1 to 2 parts of heat stabilizer. The defects that a polyimide material additive manufacturing product is large in shrinkage rate and high in porosity are overcome, and the method has wide application prospects in the field of additive manufacturing.

The invention relates to the technical field of industrial crystallization, in particular to a 5-aminolevulinic acid hydrochloride crystal form and a preparation method thereof, and the preparation method comprises the following steps: adding a 5-aminolevulinic acid hydrochloride crude product into a specific solvent with the concentration of 0.3-0.8 g/ml, conducting dissolving and clarifying at room temperature, and conducting filtering to remove mechanical impurities so as to avoid interference on crystallization, then dropwise adding another specific solvent at room temperature, stopping dropwise adding after turbidity is generated, maintaining stirring and growing the crystal for 30 minutes or more, continuously dropwise adding a solvent with a specific multiple, separating out a large amount of crystals, conducting filtering, washing a filter cake, and conducting drying in vacuum to obtain the crystal of the 5-aminolevulinic acid hydrochloride crystal form. The product prepared by the method is a white crystal, has good solubility, short melting range and high purity, subsequent preparation of various preparations is facilitated, and a new crystal and a preparation method are provided for efficient utilization of 5-aminolevulinic acid hydrochloride.