66 results about "Melt viscosity" patented technology

The present invention provides a sealing sheet for solar cell modules that offers a desirable level of molding properties, heat resistance, and effectively suppresses defects during hot press processing. [Solution] A encapsulating sheet for solar cell modules, with a polyolefin resin as the base resin, a melting point of 55°C to 120°C, a temperature difference of 20°C or less between the extracellular melting initiation temperature and the melting point, and a shear rate of 2.43 × 10 sec measured at 190°C. -1 The solar cell module comprises a sealing sheet having a melt viscosity of 1000 Pa·s or more and 4000 Pa·s or less, preferably with a gel fraction of 10% or less, and at least one of the front sealing layer and the back sealing layer being composed of the sealing sheet.

The present invention provides a curable composition with excellent thermal expansion resistance when used in prepreg applications, as well as prepregs, resin films, metal-clad laminates, printed circuit boards, semiconductor packages, and a method for adjusting melt viscosity. [Solution] The resin contains at least two compounds that have different structures from the compounds represented by general formula (1), and R is present in the resin. 1 , R 2 and R 3 At least one of them is a vinylbenzyl group, and R present in the resin 1 , R 2 and R 3 A curable composition comprising a resin (A) in which at least one of the members is an arylalkyl group other than a vinylbenzyl group, an azo radical polymerization initiator (B), and an imidazole compound (C).

This invention relates to the field of polymer material processing and blending technology, and discloses a fiber uniform mixing process in the preparation of bio-based materials. The process includes: controlling the barrel wall temperature of the main dispersion zone of a co-rotating twin-screw extruder to be lower than the intrinsic melting point of the polylactic acid matrix and turning off the external heater; adding jute fiber bundles and the polylactic acid matrix and controlling the screw speed, utilizing the frictional heat balance temperature difference generated by mechanical shearing to maintain the actual melt temperature above the intrinsic melting point; and conveying the mixture to the secondary diffusion zone as the motor drive torque increases, thereby increasing the barrel wall temperature of the secondary diffusion zone and reducing the screw speed to blend the materials. This invention eliminates temperature control lag, maintains a stable shear flow field, avoids a sudden drop in melt viscosity to improve fiber dispersion uniformity, automatically indicates process stage transitions, avoids material thermal degradation, and improves the stability of the mechanical properties of the finished material.

The application discloses a kind of deformation-resistant thermoplastic composite material and preparation method thereof, belong to high polymer composite material preparation technical field, to solve the existing thermoplastic composite material under high load prone to creep, fiber infiltration is insufficient and the problems such as insufficient part size stability.The application uses cyclic butylene terephthalate oligomer as low-viscosity precursor, introduces bifunctional catalytic crosslinking agent, and carries out in-situ reactive molding with glass fiber reinforcement.The method utilizes the low melt viscosity of cyclic butylene terephthalate oligomer, realizes the sufficient infiltration of fiber reinforcement before polymerization and viscosity increase, and constructs a covalent crosslinking network containing dynamic ester exchange bond in-situ during ring-opening polymerization.The obtained composite material has low porosity and good interface bonding, and significantly improves the anti-creep performance and dimensional stability while maintaining the toughness of thermoplastic materials.

The present application relates to a kind of dynamic adjustment control method of fiber forming process window to deal with coal-based solid waste composition fluctuation, comprising the following steps: real-time capture raw material composition, melt viscosity, temperature, fiber diameter and equipment running state;Based on composition-technological coupling model, input perceived multidimensional data, according to composition interval, work condition operation is carried out, and quantitative adaptation rule is quantified;In actual processing process, when melt viscosity exceeds 1500Pas, first, through instruction, the heating power of electric melting furnace is promoted, and if it does not reach the standard for 5min, then the speed of centrifuge is linked to promote;When fiber diameter exceeds 20 μm, first, air flow wind pressure is adjusted, and then electric melting furnace temperature is fine-tuned;Product detection unit real-time acquisition density, strength, fiber diameter data.

An underfill film for a semiconductor package and a method for manufacturing a semiconductor package using the underfill film are disclosed. The underfill film is suitable for a semiconductor package, which, by including an adhesive layer having low lowest melt viscosity, can improve the connection reliability of a package by minimizing the formation of voids during semiconductor packaging.

The present disclosure provides a thermosetting resin composition which, when the thermosetting resin composition and a semi-cured product thereof are heated, exhibits a property of first maintaining a low melt viscosity state and then rapidly becoming curable, which improves the storage stability of the thermosetting resin composition and the semi-cured product thereof, and reduces an increase in a linear expansion coefficient and suppresses a decrease in a glass transition temperature of a cured product, which is often associated with heating. The thermosetting resin composition contains a radically polymerizable unsaturated compound and an organic radical compound.

The present invention relates to a composition for manufacturing a three-dimensional object for transporting, distributing or storing gas, by extrusion blow molding, comprising from 70 to 99.49% by weight of at least one polyamide having a number of carbon atoms per nitrogen atom greater than or equal to 6.5; from 0.50% to 25% of at least one functional polyolefin having a glass transition temperature Tg of less than -25°C; from 0.01 to 5% by weight of at least one additive, the composition having a melt viscosity greater than 40 000 Pa.s. The present invention also relates to a method for preparing the composition and to the use of the composition for manufacturing a three-dimensional object. The present invention also relates to a method for preparing the three-dimensional object. The present invention also relates to the three-dimensional object manufactured by extrusion blow molding, as well as to the three-dimensional object comprising a sealing layer.

A bobbin comprising a body portion around which a coil is capable of being wound is disclosed. The body portion comprises a polymer composition containing a polymer matrix that includes a thermotropic liquid crystalline polymer. The polymer composition exhibits a melt viscosity of about 300 Pa-s or less and a deflection temperature under load of about 170° C. or more.

This invention discloses a tearable heat shrink tubing with helical tearability along its length. The heat shrink tubing contains at least a fluororesin as the matrix resin, comprising a first fluororesin and a second fluororesin. The first fluororesin has a melt index of 15-40 g / 10min, and the second fluororesin has a melt index of 2-7 g / 10min. This invention's tearable heat shrink tubing utilizes a blend of high and low melt index fluororesins. Due to the difference in melt viscosity and flow characteristics between the two components, the high melt index fluororesin exhibits better flowability and is more prone to molecular chain orientation under stretching or blowing, forming a microcrystalline structure. Conversely, the low melt index fluororesin has poorer flowability and a relatively lower degree of orientation, resulting in inhomogeneity in the microstructure formed in the blend system and the generation of a weak interfacial layer at the phase interface, thereby improving the helical tearability of the tearable heat shrink tubing.

This invention relates to the field of iron and steel metallurgy technology, and in particular to a method, system, and application method for predicting the viscosity of titanium-containing blast furnace molten iron based on a cascaded neural network. The method includes collecting the temperature and mass fractions of Fe, C, Si, Mn, P, S, and Ti elements in the titanium-containing blast furnace molten iron and inputting them into a first-stage neural network. The first-stage neural network predicts the free volume ratio, cluster volume ratio, number of atomic clusters per unit volume, solid phase particle fraction, and superheat. Intermediate structural parameters are then input into a second-stage neural network, outputting the target physical property values ​​of the titanium-containing blast furnace molten iron viscosity. This invention introduces physically interpretable liquid structural parameters as intermediate variables into the neural network structure, achieving accurate and efficient prediction of the viscosity of multi-component, strongly non-ideal melt systems.

The application discloses a modified engineering plastic based on PPA and a preparation method thereof in the field of engineering plastics, and comprises the following components in parts by weight: polyamide 66 salt 50-60 parts, polyamide 6T salt 20-30 parts, polyamide 6I salt 12-20 parts, flame-retardant polyurethane prepolymer 5-10 parts, and toughening agent 3-8 parts. The application solves the low-temperature brittleness problem of traditional PPA through the introduction of flexible chain segments and micro-crosslinking regulation, and meanwhile, high strength is maintained; the introduction of phosphine hetero-phenyl groups enables the material to achieve high-grade flame retardation, and additional flame retardant does not need to be added, thereby avoiding the negative influence on the mechanical properties; the synergistic effect of the semi-aromatic structure and the micro-crosslinking network can meet the high-temperature working condition requirement; the step-by-step polymerization controls the molecular weight distribution; the tackifying process adjusts the melt viscosity; the processing such as drawing and pelletizing is facilitated; and the application is suitable for injection molding.

Provided are a fibrous filler-reinforced recycled polyarylene sulfide resin composition that contains a recycled polyarylene sulfide resin, without affecting the inherent heat resistance, chemical resistance and fluidity of a polyarylene sulfide resin, and a production method thereof.The fibrous filler-reinforced recycled polyarylene sulfide resin composition contains a polyarylene sulfide resin (A), a recycled polyarylene sulfide resin (B) and a fibrous filler (C), the polyarylene sulfide resin (A) having a melt viscosity of 100 to 3000 poises, the amount of the recycled polyarylene sulfide resin (B) contained being 10 to 250 parts by weight per 100 parts by weight of the polyarylene sulfide resin (A), and the amount of the fibrous filler (C) contained being 10 to 60 parts by weight per 100 parts by weight in total of the polyarylene sulfide resin (A) and the recycled polyarylene sulfide resin (B).

This invention relates to the use of poly(alkylphenol) resins for reducing the melt viscosity of thermoplastic polyurethane (TPU), and to a composition comprising thermoplastic polyurethane (TPU) and at least one poly(alkylphenol) resin. The invention also relates to a method for preparing a composition as defined herein, wherein the poly(alkylphenol) resin is incorporated into the TPU, particularly into molten TPU. Specifically, the poly(alkylphenol) resin comprises repeating units of formula (I), wherein iR 1 It is a straight-chain or branched alkylene group having 1 to 10 carbon atoms; ii.R 2 It is a straight-chain or branched alkyl group having up to 10, for example, 1 to 10 carbon atoms, especially 2 to 8 carbon atoms or 3 to 6 carbon atoms, especially 4 carbon atoms.

This invention relates to a polyester polyol modified with tricyclodecanediethanol, its preparation method, and its applications, belonging to the technical field of polyester polyols and polyurethane materials. The polyester polyol is prepared by esterification and polycondensation reactions of aliphatic diacids and diols. The diols include alicyclic diols, chain alkane diols, and functional diols; the alicyclic diol is a compound system of tricyclodecanediethanol and 1,4-cyclohexanediethanol, and the functional diol is a diol containing siloxane units or fluorine units. This invention, through a specific ratio of two alicyclic diols, balances material rigidity and flexibility, reduces melt viscosity, and improves processing fluidity; by in-situ copolymerizing trace amounts of functional diols, fluorine / silicone segments spontaneously accumulate to the surface, reducing surface energy and improving stain resistance and mold release properties. This polyester polyol and its downstream products maintain high light transmittance and high mechanical strength, achieving synergistic optimization of bulk and surface properties, and are suitable for high-end coatings, optical coatings, and other fields.

The application relates to the technical field of ceramics, and discloses a skin glaze, dark skin glaze ceramic tiles and a preparation method thereof. The skin glaze can effectively expand the glaze melting temperature range, stabilize high-temperature viscosity, inhibit excessive glaze layer flow during the firing stage, avoid physical disturbance to the ink form, and significantly improve the problems of pattern edge blur, ink scattering, color phase unevenness and the like through the synergistic effect of SrO and ZnO; meanwhile, the SrO and ZnO synergistically control the glaze melt crystal precipitation behavior, optimize the microcrystal distribution and surface flatness, thereby improving the smooth and delicate touch of the glaze surface, eliminating defects such as bright spots, dull spots, roughness and dryness, and guaranteeing the appearance and texture stability of the skin glaze. In addition, the skin glaze further introduces B2O3, which can be used as a low-temperature fluxing agent to reduce the glaze melt viscosity, improve the leveling property, reduce defects such as pinholes, glaze shrinkage and corrugation, and improve the glaze layer density, and B2O3 can also synergistically stabilize the high-temperature viscosity with ZnO and SrO, optimize the ink color development environment, and improve the satin gloss feeling and gloss stability of the glaze surface.

This invention relates to the field of thin film technology, specifically providing a polymer thin film and its manufacturing method, comprising the following raw materials in parts by weight: 48-52 parts of recycled polypropylene (rPP), 38-42 parts of polybutylene adipate-butylene terephthalate (PBAT), 7-9 parts of surface-aminated modified nanocellulose whiskers (CNC, diameter 20-30 nm), and 1.2-1.8 parts of bio-based interface stabilizer. This invention utilizes maleic anhydride grafted lignin to form a three-dimensional hydrogen bond network with rPP / PBAT. DSC measurements show a phase separation temperature difference ΔT = 35℃ and an interfacial peel strength of 13.2 N / cm. The synergistic effect of the epoxy-functionalized castor oil ring-opening reaction and the release of reactive oxygen free radicals from mesoporous zinc oxide (6-10 nm) increases the gel content to 72%. Hindered amine additives are released slowly through the mesoporous zinc oxide nanopores, blocking the PBAT ester hydrolysis chain reaction, resulting in a 60% reduction in the measured hydrolysis rate. A temperature path of 155℃→210℃→160℃ is used, with a melt viscosity fluctuation rate of ±2.5%, solving the problem of a narrow processing window caused by the heat sensitivity of PBAT.

A hydroxyl-terminated polyester resin, a preparation method therefor and use thereof. The hydroxyl-terminated polyester resin is composed of the following raw materials in parts by mass: 25-50 parts of a diol, 40-70 parts of a dibasic acid, 0.1-2 parts of glycidyl tertcarbonate, 0.5-4 parts of a hydroxylation reagent, 0.08-0.3 parts of a catalyst and 0.2-0.5 parts of an antioxidant. The acid value of the polyester resin is 1-8 mgKOH / g, the hydroxyl value is 20-30 mgKOH / g, the melt viscosity at 200° C. is 9000-13000 mPa·s, the reactivity at 180° C. is 410-520 s, the glass transition temperature is 53-59° C., and the softening point is 101-106° C.

A hot melt adhesive (HMA) composition comprises: a) an ethylene / alpha-olefin multi-block interpolymer that has a melt viscosity (177° C.)≤50,000 mPa·s; b) an anhydride and / or carboxylic acid functionalized propylene-based polymer that has a melt viscosity (190° C.)≤50,000 mPa·s; c) a tackifier; and d) a wax. Such composition delivers both a high temperature heat resistance and a fast set time.

A dental block material containing polyether ether ketone and an inorganic filler, the inorganic filler being contained in the dental block material at a proportion of 10 mass% or more and less than 30 mass%, the dental block material having a melt viscosity of 450 to 690 Pa-sec at a temperature of 380°C and a shear rate of 1216 (sec ‑1 ).

This invention relates to the field of polymer material injection molding and automation control technology, specifically to an intelligent control system for injection molding machine parameters, comprising: a rheological digital twin and feedforward calculation unit: generating wavefront position prediction information based on key timestamps; a transient pulsation command generation unit: parsing the wavefront position prediction information and superimposing high-frequency micro-amplitude pulsation commands onto the macroscopic injection speed command; a high-frequency shear heat injection and physical phase change unit: reducing the local melt viscosity of the wavefront based on the high-frequency micro-amplitude pulsation commands; an energy decoupling and state recovery unit: monitoring the execution state of the high-frequency micro-amplitude pulsation commands, restoring the polymer melt to a high viscosity state and completing cooling and solidification; and an adaptive control and optimization unit: quantifying the microstructure filling rate of the microstructure region and optimizing the transient pulsation generation strategy according to the wavefront velocity fluctuation variance. This invention ensures the complete replication of the microstructure and robustness for long-term continuous production.

The objective of this invention is to provide a liquid crystal polyester resin that exhibits low dielectric constant and low dielectric loss tangent while simultaneously improving practical heat resistance and suppressing the generation of escape gases or foreign matter. The liquid crystal polyester resin based on this invention is characterized by comprising at least 90 mol% of constituent units derived from hydroxycarboxylic acids, including constituent units (A) derived from p-hydroxybenzoic acid, constituent units (B) derived from 6-hydroxy-2-naphthoic acid, and constituent units (C) derived from hydroxycarboxylic acids other than those described above (A) and (B). Constituent unit (C) is a constituent unit selected from at least one of m-hydroxybenzoic acid, 6-hydroxynicotinic acid, and 4'-hydroxy-4-biphenylcarboxylic acid. The liquid crystal polyester resin further… The step comprises at least one of a constituent unit (D) from a dicarboxylic acid and a constituent unit (E) from a diol, wherein the composition ratio (mol%) of the constituent units (A) to (E) satisfies the following conditions: 10 mol% ≤ constituent unit (A) ≤ 30 mol%, 60 mol% ≤ constituent unit (B) ≤ 80 mol%, 0.1 mol% ≤ constituent unit (C) ≤ 10 mol%, 0.1 mol% ≤ constituent unit (D) + constituent unit (E) ≤ 2.0 mol%, and the melt viscosity of the liquid crystal polyester resin measured at 350°C under a shear rate of 1000 / s is 25 Pa·s or higher.

The present application relates to the technical field of polyethylene materials, and particularly relates to a regenerated ultra-high molecular weight polyethylene fiber dry yarn and a preparation method thereof. The present application takes into account the processing fluidity and the mechanical skeleton integrity through the design of spherical lubrication-linear enhancement, realizes the long-term residence of the antioxidant, solves the technical bottleneck that the melt viscosity and the mechanical strength are difficult to take into account in the regeneration process of waste UHMWPE fibers, the antioxidant is easy to migrate and lose, and the weather resistance is poor, the obtained regenerated fiber has uniform diameter, stable whiteness, and the outdoor weather resistance is significantly improved, and can be widely applied to outdoor and protection fields such as mountaineering ropes, marine cables, cut-resistant gloves and the like.

The application discloses a kind of automatic adjustment methods of adhesive film baking machine roller temperature, to solve the problem of existing roller temperature regulation exists lag and deviation.The method comprises: real-time acquisition of the working condition data of roller group;Based on the working condition data, call material flow property online identification model iterative calculation melt viscosity and solidification conversion rate, generate boundary constraint condition;Synchronous simulation heat conduction, heat convection and roller surface deformation process is constructed to digital twin multi-physics field coupling simulation model, pre-computes the temperature disturbance value of future control period;Temperature disturbance value and boundary constraint condition are input into composite control model, and the temperature set value is optimized using model predictive control algorithm rolling, and the control output is generated by adaptive disturbance observer to compensate for unmodeled disturbance;According to the priority of control output, dynamically allocate bus bandwidth, and issue temperature adjustment command to heating execution unit.The application realizes the advance compensation of roller temperature field distribution deviation, reduces the adjustment lag and deviation.

Provided is a resin composition that exhibits excellent flame retardancy and that reduces the minimum melt viscosity of a prepreg. Also provided are a prepreg, a resin film, a laminate, a printed wiring board, and a semiconductor package, which are produced using the resin composition. Specifically, the resin composition contains (A) a thermosetting resin, (X) a metal phosphate, and (Y) a phosphazene compound.

The present application relates to the technical field of high-performance structural ceramic preparation, and discloses a gradient structure forming process of high-density alumina-based ceramic plate, which comprises the following steps: preparing an alumina ceramic green body with a connected open pore structure; constructing a permeation adjustment layer containing a porous ceramic fiber framework and an auxiliary agent precursor; attaching the permeation adjustment layer to the surface of the alumina ceramic green body to form a preform; and performing gradient sintering on the preform. In the present application, the capillary pressure difference generated by the densification shrinkage of the alumina ceramic green body is used to drive the directional infiltration of the molten auxiliary agent, the sintering temperature is adjusted to control the viscosity of the melt to limit the penetration depth, and then a glass phase modification area with improved metallization activity is formed on the surface layer, while the phonon conduction channel of the high-purity alumina crystal phase in the core part is ensured, the interface thermal stress concentration is eliminated, and the service reliability of the power module heat dissipation substrate is improved.

A soft thermoplastic elastomer powder has a thermal conductivity coefficient of 0.25 to 0.45 W / mK, a Shore hardness of 20D to 49D, a process window of ≥20° C., and a melt viscosity of less than 1,000 Pa*s (0.63 rad / s) at a specific temperature (Tm+30° C.). The soft thermoplastic elastomer powder includes 100 parts by weight of a thermoplastic polyurethane elastomer, 0.01 to 2.0 parts by weight of a thermal conductive agent, and 0.05 to 2.0 parts by weight of a flow aid agent. The process window of the thermoplastic polyurethane elastomer is ≥15° C. The thermal conductivity coefficient of the thermal conductive agent is 50 to 400 W / mK, and the particle size of the thermal conductive agent is 0.5 μm to 6 μm.