18 results about "Characteristic viscosity" patented technology

The application relates to the technical field of polyester fiber production, and discloses a power dispatching optimization method and system for industrial production, which are used for a polyester fiber direct spinning production line. The method comprises the following steps: calculating a characteristic viscosity qualified interval of polyester fiber melt; collecting process parameter data flow of a polymerization reactor in the polyester fiber direct spinning production line; calculating a basic power demand curve and a power regulation margin; collecting real-time state data of a spinning beam in the polyester fiber direct spinning production line; calculating minimum power demand and an interruptible time window set of the spinning beam; calculating a working instruction set of the polymerization reactor and the spinning beam in a preset dispatching period so as to minimize the production cost of the polyester fiber direct spinning production line; and dispatching the polymerization reactor and the spinning beam to work so as to produce the polyester fiber melt. The application not only solves the technical problem that quality guarantee and power saving cannot be considered simultaneously in polyester fiber direct spinning production, but also provides a general power-process collaborative optimization paradigm.

The invention discloses a high-strength special polyester filament fiber, and relates to the technical field of fibers, the high-strength special polyester filament fiber comprises the following raw materials by weight: 95.5-98.7% of polyethylene glycol terephthalate with intrinsic viscosity of 1.0-1.2 dL / g, 0.3-0.8% of a chain extender, 0.5-2.0% of nano inorganic particles, and 0.5-1.5% of a hydrolysis-resistant stabilizer, the terminal carboxyl group content of the polyethylene glycol terephthalate is less than 30 mol / t, and the terminal carboxyl group content of the chain extender is less than 30 mol / t. By arranging the infiltration mechanism, when fibers are dragged, rolling shafts can be driven to rotate, outer wall rotating sleeves, connecting rods and stirring balls are driven to rotate while the rolling shafts rotate, liquid contained in an infiltration box is stirred through the stirring balls, liquid flowing is generated, the liquid is made to make continuous contact with the surfaces of the fibers, the infiltration uniformity is improved, and the infiltration efficiency is improved. And due to the mixing uniformity of the liquid, the influence on the infiltration effect caused by component layering or precipitation due to long-time static state of the liquid is avoided.

The disclosure refers to a composition comprising poly(3-hexylthiophene) nanoparticles suspended in a saline solution comprising a stabilizing agent selected from a non-ionic surfactant, a water-soluble polymer having high intrinsic viscosity and a combination thereof. The preferred water-soluble polymer is hyaluronic acid. The saline solution is an aqueous solution comprising at least sodium ions and chloride ions. The saline solution may further comprise at least one of: magnesium ions, calcium ions, potassium ions, and combination thereof. The formulation has demonstrated an improved effectiveness in restoring a visual response in the RCS rat model of blindness and is potentially effective in the treatment of human retinal dystrophies such as retinitis pigmentosa (RP) and macular degeneration (AMD).

The invention discloses a preparation method of a high molecular weight polylactic acid-glycolic acid copolymer (PLGA). According to the method, PLGA (poly (lactic-co-glycolic acid)) with relatively low molecular weight is taken as a macromolecular initiator, and ring-opening polymerization of glycolide and lactide monomers is initiated under the action of a catalyst. In the preparation process, a programmed cooling control strategy is introduced by combining the kinetic characteristics of the polymerization reaction, so that the temperature field gradient in the reaction process is accurately regulated and controlled. The control strategy effectively inhibits chain termination and thermal degradation side reactions in the later stage of the reaction while ensuring rapid proceeding of the reaction in the initial stage. According to the method disclosed by the invention, the monomer conversion rate is remarkably improved, and the ultra-high molecular weight PLGA material with the intrinsic viscosity of 1.5 or above is successfully prepared.

The invention relates to the technical field of printing processes, and particularly discloses a high-adhesion water-based ink printing process and equipment. The process comprises the following steps: performing corona and modification treatment on a low-surface-energy printing base material; adjusting the viscosity of the water-based ink and carrying out coating printing; and hot air drying curing and glazing protection treatment are conducted, and a printed finished product is obtained. The equipment comprises an attachment acquisition module for extracting the characteristic viscosity through inter-partition merging processing; the deviation analysis module determines a target viscosity working interval and an instability sensitive domain based on a dynamic response relationship between characteristic viscosity analysis and dot forming and adhesion performance; the dynamic analysis module monitors the synchronization state of the viscosity and the image quality change trend, and judges whether significant desynchronization tending to an instability sensitive domain is presented or not; and the optimization adjustment module executes synchronous repair and trajectory planning and outputs a dynamic viscosity set value adjustment sequence. Through cooperation of the technology and equipment, the stability of the printing technology is improved.

Polyethylene powder satisfying (Requirements 1 and 2):(Requirement 1)a viscosity change rate of a gel under <Conditions for Preparing Gel> is −0.8 to 0.0 Pas / ° C. under <Conditions for Measurement of Viscosity Change Rate>;<Conditions for Preparing Gel>28 g liquid paraffin of 450 to less than 550 g / mol, 12 g polyethylene powder, and 0.4 g tetrakis[methylene(3,5-di-t-butyl-4-hydroxy-hydrocinnamate)]methane are kneaded at 200° C. and 50 rpm for 10 min using Labo Plastomill to obtain a gel;<Conditions for Measurement of Viscosity Change Rate>viscosity (Pas) is measured at a piston rate of 10 mm / min (shear rate of 266 s−1) at 200° C. and 230° C. in accordance with a flow characteristics test using a capillary die prescribed in JIS K7199, and a viscosity change rate (Pas / ° C.):viscositychangerate=η⁡(266,230)-η⁡(266,200)3⁢0(1)wherein η(A,B) represents a viscosity found at shear rate of A s−1 and temperature of(Requirement 2)intrinsic viscosity (IV) is 1.5 to less than 18.0 dL / g.

The invention discloses a polymer F-PDA as well as a preparation method and application thereof, the structural formula of the F-PDA is as shown in formula I. The F-PDA is prepared by copolymerizing a water-soluble fluorescent monomer (FM), acrylamide (AM) and dimethyl diallyl ammonium chloride (DMDAAC) through an inverse emulsion polymerization method for the first time. By optimizing process parameters such as the initiator, the emulsifier and the oil-water ratio, the prepared polymer is high in characteristic viscosity and high in dissolution speed. The F-PDA has excellent flocculability and a fluorescence tracing function, the fluorescence intensity and the concentration of the F-PDA have an excellent linear relationship (R is greater than 0.99), and the lower detection limit reaches 1.03 * 10 <-6 > g / L. The system breaks through the bottleneck that a traditional flocculant cannot be accurately monitored in real time, provides key technical support for intelligent feeding and intelligent water quality management based on online monitoring, can be widely applied to sludge dewatering, river dredging and other scenes, and achieves cost reduction and efficiency improvement.

One embodiment of the present invention relates to a polypropylene-based resin composition or a foam molded body containing a polypropylene-based resin composition, and the polypropylene-based resin composition is a polypropylene-based resin composition (X) containing 20 parts by mass or more and 80 parts by mass or less of an impact polypropylene (A) that satisfies the following requirements (a-1) and (a-2), 10 parts by mass or more and 40 parts by mass or less of an ethylene-based elastomer (B) that satisfies the following requirements (b-1) and (b-2), and 10 parts by mass or more and 40 parts by mass or less of an inorganic filler (C) that is talc, wherein the requirement (x-1) is satisfied.(a-1) an MFR measured at 230° C. and a load of 2.16 kg in accordance with ASTM D-1238 is 60 g / 10 min or more and 300 g / 10 min or less;(a-2) a propylene / ethylene copolymer that is specified as a decane soluble part at 23° C. is contained, and an intrinsic viscosity [η] of the propylene / ethylene copolymer is 4.1 dl / g or more and 10 dl / g or less;(b-1) an MFR measured at 190° C. and a load of 2.16 kg in accordance with ASTM D-1238 is 0.5 g / 10 min or more and 30 g / 10 min or less;(b-2) a density is 0.85 g / cm or more and 0.875 g / cm or less; and(x-1) a content of a polypropylene component having a molecular weight of 106.5 or more is less than 0.05 mass % relative to 100 mass of the polypropylene-based resin composition (X).

The present application belongs to the technical field of polymer materials, and particularly relates to a low-shrinkage high-transmittance polypropylene composition and a preparation method thereof. The composition is composed of the following raw materials in percentage by weight: polypropylene resin: 29.2-79.85%; polyethylene resin: 10-25%; elastomer: 0-10%; light diffuser: 0-5%; inorganic filler: 10-30%; nucleating agent: 0.05-0.5%; antioxidant: 0.1-0.3%; wherein the polypropylene resin is an impact copolymer polypropylene, and the ratio of the characteristic viscosity of the rubber phase to that of the polypropylene resin is 1-1.2; the polyethylene resin is prepared by using a metallocene catalyst. The present application optimizes the formula of the composition, significantly improves the transmittance, impact resistance and dimensional stability of the polypropylene material on the basis of maintaining excellent mechanical properties, so as to meet the market demand for high-performance polypropylene materials.

A process to manufacture dissolving pulp grade cellulose said process comprising the steps of: o providing a lignocellulosic material; o optionally, comminuting said lignocellulosic material into chips of a particle size no greater than 5 cm o providing a modified Caro's acid, wherein said modified Caro's acid o exposing said lignocellulosic material to said modified Caro's acid at a temperature of less than or equal to 45°C for a period of time sufficient to allow the modified Caro's acid to delignify said lignocellulosic material and yield a solid cellulosic portion and a liquid portion with a high dissolved lignin content; o separating said solid cellulosic portion from said liquid portion; wherein said solid cellulosic portion has the following characteristics: o lignin content below 1%; o hemicellulose content below 15%; and o cellulose content of at least 75%; - exposing said solid cellulosic portion to a caustic solution yielding causticized solids; - filtering said causticized solids; - re-slurrying said causticized solids and neutralizing such to yield a dissolving pulp cellulose; and - washing said dissolving pulp cellulose with water to remove the neutralized salts to obtain a high purity dissolving pulp cellulose having the following characteristics: o over 90% cellulose content; o less than 1% lignin content; o less than 5% hemicellulose content; and o an intrinsic viscosity ranging between 100 – 800 mL / g.

A process to manufacture dissolving pulp grade cellulose said process comprising the steps of: o providing a lignocellulosic material; o optionally, comminuting said lignocellulosic material into chips of a particle size no greater than 5 cm o providing a modified Caro's acid, wherein said modified Caro's acid o exposing said lignocellulosic material to said modified Caro's acid at a temperature of less than or equal to 45°C for a period of time sufficient to allow the modified Caro's acid to delignify said lignocellulosic material and yield a solid cellulosic portion and a liquid portion with a high dissolved lignin content; o separating said solid cellulosic portion from said liquid portion; wherein said solid cellulosic portion has the following characteristics: o lignin content below 1%; o hemicellulose content below 15%; and o cellulose content of at least 75%; - exposing said solid cellulosic portion to a caustic solution yielding causticized solids; - filtering said causticized solids; - re-slurrying said causticized solids and neutralizing such to yield a dissolving pulp cellulose; and - washing said dissolving pulp cellulose with water to remove the neutralized salts to obtain a high purity dissolving pulp cellulose having the following characteristics: o over 90% cellulose content; o less than 1% lignin content; o less than 5% hemicellulose content; and o an intrinsic viscosity ranging between 100 – 800 mL / g.

The application relates to a heat-conducting polyester composite material and a preparation method and application thereof. The heat-conducting polyester composite material comprises the following components in parts by weight: 28-66 parts of PCT resin, 8-42 parts of reinforcing material and 10-42 parts of modified spherical boron nitride; the modified spherical boron nitride is spherical boron nitride with isocyanurate alkoxysilane on the surface; and the PCT resin has a characteristic viscosity of 0.5-1.0 dl / g. The heat-conducting polyester composite material has good mechanical properties, high inter-plane thermal conductivity and thermal conductivity isotropy.

The invention relates to the technical field of wires and cables, and provides a high-strength wire and cable and a preparation method thereof. The high-strength wire cable comprises a conductor, an insulating layer and a sheath layer which are sequentially arranged from inside to outside, and the sheath layer is prepared from the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 6-8 parts of a stabilizer, 30-35 parts of a plasticizer, 30-40 parts of filler, 2-4 parts of a lubricant and 1-3 parts of an antioxidant; the polyvinyl chloride is composed of first polyvinyl chloride and second polyvinyl chloride in a mass ratio of (4-5): 6, and the intrinsic viscosities of the first polyvinyl chloride and the second polyvinyl chloride are different. According to the technical scheme, the problem of insufficient strength of wires and cables in related technologies is solved.

The invention relates to a high-displacement high-concentration polymer dry powder direct distribution variable-viscosity fracturing fluid device and process, and belongs to the technical field of polymer fluid preparation and dissolution quality control. The process comprises the steps that S1, a main process pipeline system is constructed, and a mixing feeding assembly, a shearing dispersion assembly and an online optical detection assembly are sequentially arranged in the flow direction of fluid; a rheodynamic control algorithm is executed in cooperation with the control and operation unit; s2, obtaining the net viscous resistance moment of fluid acting on the high-speed rotor, and correcting the net viscous resistance moment into the real hydration characteristic viscosity influenced by the decoupling rotating speed; s3, constructing a hydration evolution model and monitoring the dissolution mass to represent the proportion of undissolved particles in the fluid; s4, deducing the stable viscosity of the fluid reaching the front edge of a fracturing crack through a well bottom hole, and carrying out differential adjustment on the shearing rotating speed, the method overcomes the reading deviation caused by equipment friction and rotating speed fluctuation in traditional measurement, and ensures the accuracy of judgment of the expansion degree of the polymer molecular chain.

The present invention relates to a polyolefin composition, to an article comprising said polyolefin composition, preferably to a cable comprising an insulating layer comprising said polyolefin composition, and to the use of said polyolefin composition as cable insulation for medium-voltage, high-voltage, extra-high-voltage and extra-high-voltage cables, the polyolefin composition having a total ethylene content of greater than 32.5 to 60.0 wt% based on the total weight of the polyolefin composition and determined by Crystallization Extraction (CRYSTEX) by FT-IR spectroscopy calibrated by Quantitative 13C-NMR spectroscopy; a melt flow rate MFR2, determined according to ISO 1133 at 230 DEG C and 2.16 kg, of greater than 2.5 to 6.0 g / 10 min; a crystalline fraction (CF) content determined by crystallization extraction (CRYSTEX) in an amount, based on the total weight of the polyolefin composition, in the range of 75.0 to 95.0 wt.%, the crystalline fraction (CF) having an ethylene content (C2 (CF)) determined by FT-IR spectroscopy calibrated by quantitative 13C-NMR spectroscopy in the range of greater than 32.5 to 62.5 wt.%, based on the total amount of monomer units in the crystalline fraction (CF), and a soluble fraction (SF) content, determined by crystallization extraction (CRYSTEX), in an amount, based on the total weight of the polyolefin composition, in the range of 5.0 to 25.0 wt%, said soluble fraction (SF) having an intrinsic viscosity (iV (SF)), determined according to ISO 1628-3, in the range of 85 to 200 cm3 / g.

The application relates to a PEN resin and a synthesis method thereof, which comprises the following steps: S1, preparing 2,6-naphthalene dicarboxylic acid and ethylene glycol into a slurry, ultrasonic dispersion, and adding into a microchannel reactor; S2, adding a titanium-tantalum composite catalyst into the microchannel reactor, reacting under the protection of inert gas, and obtaining an esterification reactant; S3, collecting the esterification reactant obtained in the step S2 into a polycondensation kettle, heating, reducing pressure, and reacting to obtain a polymer melt; and S4, cooling the polymer melt obtained in the step S3, granulating, and obtaining the PEN resin; the preparation raw materials of the titanium-tantalum composite catalyst in the step S2 include tetrabutyl titanate, titanium isopropoxide and tantalum isopropoxide. The PEN resin synthesized by the method has a characteristic viscosity of 0.5-0.9 dL / g, a molecular weight distribution of 1.15-1.25, a glass transition temperature of 122-126 DEG C and a melting point of greater than or equal to 268 DEG C.

The invention relates to a preparation method of low-color-value recycled polyester, and belongs to the technical field of new materials. The invention aims to solve the problems of high color value and poor quality of products caused by thermal degradation and oxidative degradation in the processing process of regenerated polyester in the prior art. The method comprises the following steps: melting the polyester waste in a single-screw extruder, and sequentially carrying out two-stage vacuum devolatilization on the material so as to respectively remove moisture, low-molecular organic matters and subsequently generated oligomers; then, the polyester melt and a compound additive are subjected to melt blending in a double-screw extruder, and the compound additive comprises a phosphite antioxidant, a hindered phenol heat stabilizer and a bluish violet toner; and finally, carrying out rapid cooling and pelletizing by adopting an underwater pelletizing system. Through the synergistic effect of a unique process flow and a specific auxiliary agent system, the degradation reaction and the formation of chromophore are effectively inhibited, and the finally obtained regenerated polyester product has the advantages of low color value, good quality and stable and controllable intrinsic viscosity.

The application discloses a method, equipment and medium for cleaning glass high-temperature viscosity data, which can obtain the temperature corresponding to the characteristic viscosity of glass, remove abnormal values in the data, and regularize the data without abnormal values, specifically, in the first step, the characteristic viscosity data is input and stored in the memory; in the second step, the original high-temperature viscosity data is loaded, and the abnormal values (temperature and viscosity abnormal values) are removed; in the third step, the data without abnormal values is fitted (linear or quadratic curve fitting), the characteristic viscosity is substituted into the fitted equation, and the temperature corresponding to the characteristic viscosity is solved; in the fourth step, the data without abnormal values is regularized; and in the fifth step, the final result, i.e. the regularized high-temperature viscosity data without abnormal values, the characteristic viscosity and the corresponding temperature data, is displayed, and the whole process can be completed in only a few seconds, thereby overcoming the problems of slow speed and low efficiency in manually processing the original high-temperature viscosity data.