31 results about "Zero shear viscosity" patented technology

This invention provides a low-emission starch-based biodegradable composition and its application. By weight, the low-emission starch-based biodegradable composition comprises 40-92 parts of flexible polyester, 2-10 parts of polylactic acid, 5-35 parts of starch, and 1-15 parts of plasticizer; the zero-shear viscosity of the flexible polyester is 1100-10000 Pa·s; in this invention, a flexible polyester with a specific zero-shear viscosity is compounded with polylactic acid, starch, and plasticizer, resulting in a lower content of aldehyde compounds in the products processed from the biodegradable composition.

A non-foaming aqueous composition is applied to a fabric substrate to provide a non-foaming light-attenuating coating in the resulting coated fabric substrate that produces reduced outdoor light glare. The non-foaming aqueous composition has 5-50% solids and a zero shear viscosity of 100-1000 mPa-sec at 25°C. The composition has: i) 0.1-20 wt% of porous particles, and optionally an opaque colorant; ii) 4-20 wt% of a film-forming binder material that includes at least a chlorinated polymer; iii) 2-12 wt% of a white inorganic particulate filler material having a refractive index (RI) greater than 2 and a median particle size less than 1 pm; and iv) 5-16 wt% of a white low-density particulate hydrated alumina having a median particle size less than or equal to 3 pm. The non-foaming aqueous composition can be applied to a fabric substrate to reduce outdoor light glare without changing indoor light tinting and light blocking properties.

The application belongs to the technical field of polyethylene pipe materials, and particularly relates to a high-melt-hanging-resistance high-density polyethylene pipe material and a preparation method thereof. The polyethylene pipe material comprises: 80-95 parts by weight of high-density polyethylene resin, and 5-20 parts by weight of directional crystallization nucleating agent. The directional crystallization nucleating agent comprises 85wt%-95wt% one-dimensional nanomaterial and 5wt%-15wt% nano inorganic nucleating agent, based on the total amount of the directional crystallization nucleating agent. The modified polyethylene pipe material has improved zero shear viscosity and melt strength, and can be applied to large-diameter and thick-wall pipe material products.

The present invention relates to an object comprising a sealing layer, wherein the sealing layer comprises a polyethylene comprising moieties derived from ethylene and moieties derived from an α-olefin comprising 4 to 10 carbon atoms, the polyethylene having a density of ≥ 870 and ≤ 920 kg / m3, preferably of ≥ 890 and ≤ 910 kg / m3, as determined in accordance with ASTM D792 (2013), wherein the polyethylene has a zero-shear viscosity of ≤ 12.0 kPaꞏs, as determined in accordance with ISO 6721-10 (2015). Such object exhibits a desirably low seal initiation temperature, and a desirably high hot tack strength.

An ethylene interpolymer product comprises a first component with an undetectable level of long-chain branches and a second component with a detectable level of long-chain branches wherein said first component has a weight-average molecular weight higher than said second component. The ethylene interpolymer product is characterized as having (a) an Arrhenius type flow activation energy Ea greater than or equal to 33 kJ / mol and less than or equal to 45 kJ / mol; and (b) a number-average relaxation time tn measured at 190° C. greater than or equal to 2 ms and less than or equal to 15 ms, wherein said number-average relaxation time is calculated using zero-shear viscosity η0 at 190° C. in kPa·s and plateau modulus Formula (I) at 190° C. in MPa, according to Formula (II). Film made from the ethylene interpolymer product may be characterized by a hot-tack peak strength from about 12 N to about 20 N and a lubricated puncture resistance from about 100 J / mm to about 150 J / mm.GN0Formula⁢ (I)τn=η0GN0.Formula⁢ (II)

A non-foamed aqueous composition can be applied to fabric substrates to provide non-foamed light-attenuating coatings in resulting coated fabric substrates that produce reduced glare from incident outside light. The non-foamed aqueous composition used to make these coated fabric substrates has a 5-50% solids and a zero shear viscosity of 100-1000 mPa-sec at 25° C. This composition has components i) through iv): i) porous particles at 0.1-20 weight %, and optionally an opacifying colorant; ii) a film-forming binder material comprising at least a chlorinated polymer at 4-20 weight %; iii) a white inorganic particulate filler material having a refraction index (RI) greater than 2 and a median particle size of less than 1 μm, at 5-16 weight %; and iv) a white low-density particulate hydrated alumina having a median particle size of less than or equal to 3 μm, at 2-16 weight %.

A dynamic molecular repair technology for recycled polyolefin, repair the molecular damages of polyolefin induced by mechanical recycling, where dynamic bonds are introduced between degraded chains of polyolefins, under dynamic borate exchange of transesterification reaction, to chemically bridge smaller polymer chains into larger ones, thereby increasing the mechanical properties of polyolefin recyclates. The dynamic molecular repaired polyolefins show no more than 10% decrease in tensile strength, impact strength, and zero-shear viscosity, and no more than 20% decrease in elongation, compared with virgin resin.

The present invention provides an ethylene-α-olefin copolymer which is excellent in moldability and particularly excellent in mechanical strength compared with the prior art. The copolymer of ethylene and an α-olefin having 4 to 10 carbon atoms satisfies the following conditions (1) to (7). (1) The density is 890 to 925 kg / m 3 ; (2) The MFR (190°C, 2.16 kg load) is 3.0 to 15.0 g / 10 minutes; (3) The MT (melt tension) / η * (shear viscosity) is 1.40 x 10 ‑4 to 2.90 x 10 ‑4 g / P; (4) 0.01 x 10 ‑13 x Mw 3.4 ≤ η0 (zero shear viscosity) ≤ 4.5 x 10 ‑13 x Mw 3.4 ; (5) -2.0 ≤ Mz / Mw - Mw / Mn ≤ 15; (6) The number of ethylene groups and the like is 0.1 to 1.0 per 1000C; and (7) The DSC melting curve has multiple peaks.

The present invention relates to polyethylene that has a significantly improved melt strength at low zero shear viscosity, and a minimized processing load, and thus can produce a polyethylene film having excellent processability and drop impact strength which can be applied to wide-width agricultural films or an all-polyethylene single material (All-PE_Uni) used for shrinkable films.

Ethylene-based polymers having a high load melt index of 4-15 g / 10 min and a density of 0.94-0.96 g / cm3 are disclosed. These polymers can have one or more of a zero-shear viscosity from 475 to 2000 kPa-s, a relaxation time from 4 to 20 sec, a CY-a parameter from 0.2 to 0.28, a tan δ at 0.1 sec-1 from 1 to 1.5 degrees, and / or from 3 to 10 long chain branches per 1,000,000 total carbon atoms. The ethylene polymers have improved / reduced film thickness variation and are produced by a method that includes a step of melt processing a mixture of a base polymer and a peroxide compound through a die to produce the ethylene polymer. The amount of the peroxide compound is from 1 to 10 ppm by weight of peroxide groups based on the weight of the base polymer (or the ethylene polymer).

The ethylene-acrylic acid copolymer according to the present invention has a zero shear viscosity ([eta] 0) and a storage modulus (G ') in specific ranges, thereby having the effect of being able to maintain initial high adhesive properties for a long period of time.

Provided is an ethylene-acrylic acid copolymer which may maintain high initial adhesive properties for a long time by having a zero shear viscosity (η0) and a storage modulus (G′) in specific ranges.

The present application relates to the technical field of fluorine-free anti-dripping agent, and particularly relates to a high-efficiency fluorine-free anti-dripping agent and a preparation method thereof, which comprises high-aspect-ratio silicon nanotubes, low-aspect-ratio silicon nanotubes, modified PVP-b-PCL and a composite stabilizer. The high-aspect-ratio silicon nanotubes are grafted with PEG, which effectively prevents PBT molecules from approaching the surface of the silicon nanotubes, thereby controlling the shrinkage of the material after molding. The low-aspect-ratio silicon nanotubes are added to prevent the high-aspect-ratio silicon nanotubes from directly contacting and tightly winding to cause agglomeration, and the introduction of the low-aspect-ratio silicon nanotubes can significantly improve the zero-shear viscosity of the polymer melt, thereby avoiding the warping and distortion of the product. The PCL segment of the modified PVP-b-PCL helps the high-aspect-ratio silicon nanotubes to better integrate into the PBT matrix, and the PVP segment prevents the short nanotubes from being aggregated due to polarity, so that the low-aspect-ratio silicon nanotubes can stably exist around the high-aspect-ratio silicon nanotubes to form a uniform mixture.

Ethylene-based polymers having a high load melt index of 4-15 g / 10 min and a density of 0.94-0.96 g / cm3 are disclosed. These polymers can have one or more of a zero-shear viscosity from 475 to 2000 kPa-s, a relaxation time from 4 to 20 sec, a CY-a parameter from 0.2 to 0.28, a tan δ at 0.1 sec−1 from 1 to 1.5 degrees, and / or from 3 to 10 long chain branches per 1,000,000 total carbon atoms. The ethylene polymers have improved / reduced film thickness variation and are produced by a method that includes a step of melt processing a mixture of a base polymer and a peroxide compound through a die to produce the ethylene polymer. The amount of the peroxide compound is from 1 to 10 ppm by weight of peroxide groups based on the weight of the base polymer (or the ethylene polymer).

Disclosed are a modified conjugated diene polymer, a method for preparing the same, and a rubber composition. The conjugated diene polymer has a modified group of a nitrogen atom-containing group and an alkoxysilane at a terminal end, and a nitrogen element content of 20-200 ppm in the polymer. The zero shear viscosity η0 and the weight average molecular weight Mw of the polymer measured using a rotational rheometer satisfy the following conditions: 1.2 lgMW ≤lgη0(395K)≤2.5 lgMW By controlling the relationship between the zero shear viscosity and the weight average molecular weight within a certain range, the present application can ensure that when the values are large, the viscosity can be inhibited from rising greatly in a mixing process, the processing performance is more excellent, the adhesion is reduced, and the drying performance is improved; and when the values are low, excessive molecular chain entanglement and friction resistance can be avoided, so that heat generation can be reduced, and wear can be reduced.

A non-foamed aqueous composition can be applied to fabric substrates to provide non-foamed light-attenuating coatings in resulting coated fabric substrates that produce reduced glare from incident outside light. The non-foamed aqueous composition used to make these coated fabric substrates has a 5-50% solids and a zero shear viscosity of 100-1000 mPa-sec at 25° C. This composition has components i) through iv): i) porous particles at 0.1-20 weight %, and optionally an opacifying colorant; ii) a film-forming binder material comprising at least a chlorinated polymer at 4-20 weight %; iii) a white inorganic particulate filler material having a refraction index (RI) greater than 2 and a median particle size of less than 1 μm, at 5-16 weight %; and iv) a white low-density particulate hydrated alumina having a median particle size of less than or equal to 3 μm, at 2-16 weight %.

This invention relates to the field of catalysis, and discloses a catalyst, its preparation method and application, and a copolyester and its preparation method. The catalyst has a structure as shown in Formula (I). The polyester prepared by this catalyst has a low zero-shear viscosity, facilitating subsequent processing, and the catalyst has high catalytic activity, resulting in a low content of oligomers as a byproduct in the prepared polyester. Formula (I).

This invention relates to the field of polyesters, and discloses a modified copolyester, its preparation method, and its applications. The modified copolyester comprises a germanium-containing compound and a modified inorganic material. The germanium-containing compound has a structure as shown in Formula (I), and the modified inorganic material includes an inorganic material and an alkyl alcohol modified on the inorganic material. This modified copolyester exhibits a low zero-shear viscosity and a high Vicat softening temperature, facilitating subsequent processing and applications. Formula (I).

The invention discloses an ethylene / alpha-olefin copolymer, a preparation method and application of the ethylene / alpha-olefin copolymer in a photovoltaic packaging film. The copolymer comprises the following features: a) the melting point Tm is 50-75 DEG C; b) a zero shear viscosity [eta] 0 of 1 * 10 < 4 >-8 * 10 < 4 > Pa.s; c) the viscosity ratio n is 8-22 when the shearing rate is 1 rad / s and the shearing rate is 100 rad / s; and d) through a cross fractionation chromatography CFC test, the mass ratio of the fraction obtained by elution at 40 DEG C is 0.5-1.2 wt%, and the branching degree factor g'is in the range of 0.90-0.97. The copolymer provided by the invention has specific lubricant and shear thinning properties, so that the copolymer has excellent processability in the process of preparing a photovoltaic adhesive film, and also has improved light transmittance and peel strength.

The present invention provides an ethylene-based resin capable of producing a molded body (particularly a film) having excellent mechanical strength, and excellent balance of transparency and blocking resistance with excellent moldability. The ethylene-based resin composition (Z) of the present invention contains an ethylene-α-olefin copolymer (A) satisfying conditions (1) to (4) and an ethylene-α-olefin copolymer (B) satisfying conditions (a) to (c). (1) Density: 890 to 935 kg / m 3 ; (2) MFR (190°C, 2.16 kg load): 0.1 g / 10 min. or more and less than 3.0 g / 10 min.; (3) MT (melt tension) / η * (shear viscosity): 1.20 x 10 ‑4 ~ 2.90 x 10 ‑ 4 g / P; (4) 0.01 x 10 ‑13 x Mw 3.4 ≤ η0 (zero shear viscosity) ≤ 3.5 x 10 ‑13 x Mw 3.4 ; (a) Density: 890 to 930 kg / m 3 ; (b) MFR (190°C, 2.16 kg load): 0.1 to 10 g / 10 min.; (c) 1.90 x 10 ‑4 x Mw 0.776 ≤ [η] ≤ 2.80 x 10 ‑4 x Mw 0.776 .

The present invention provides an ethylene-α-olefin copolymer which is excellent in moldability, and enables the production of a molded body (particularly a film) which is excellent in mechanical strength, and has a balance between transparency and blocking resistance. The copolymer of ethylene and an α-olefin having 4 to 10 carbon atoms satisfies the following conditions (1) to (6). (1) The density is 890 to 925 kg / m 3 ; (2) The MFR (190°C, 2.16 kg load) is 0.1 g / 10 minutes or more and less than 3.0 g / 10 minutes; (3) The MT (melt tension) / η * (shear viscosity) is 1.20 x 10 ‑4 to 2.90 x 10 ‑4 g / P; (4) 0.01 x 10 ‑13 x Mw 3.4 ≤ η0 (zero shear viscosity) ≤ 3.5 x 10 ‑13 x Mw 3.4 ; (5) -7.0 ≤ Mz / Mw - Mw / Mn ≤ 2.0; and (6) The melting curve of DSC has multiple peaks.

Ethylene-based polymers having a high load melt index of 4-15 g / 10 min and a density of 0.94-0.96 g / cm3 are disclosed. These polymers can have one or more of a zero-shear viscosity from 475 to 2000 kPa-s, a relaxation time from 4 to 20 sec, a CY-a parameter from 0.2 to 0.28, a tan δ at 0.1 sec-1 from 1 to 1.5 degrees, and / or from 3 to 10 long chain branches per 1,000,000 total carbon atoms. The ethylene polymers have improved / reduced film thickness variation and are produced by a method that includes a step of melt processing a mixture of a base polymer and a peroxide compound through a die to produce the ethylene polymer. The amount of the peroxide compound is from 1 to 10 ppm by weight of peroxide groups based on the weight of the base polymer (or the ethylene polymer).

The application discloses a kind of based on dynamic shear modulus master curve matrix asphalt zero shear viscosity fast prediction method, the method is obtained under the condition of multiple temperature, multiple frequency of complex modulus of asphalt by dynamic shear rheological test, and equivalent principle of time-temperature is combined to construct dynamic shear modulus master curve;On this basis, modulus-viscosity conversion relationship is used to establish complex viscosity master curve, by comparing the complex viscosity under low frequency condition with the steady-state apparent viscosity under low shear rate condition, determine the equivalent application interval of Cox-Merz relationship established;Further in the interval, using rheological model is fitted to complex viscosity master curve, obtain the zero shear viscosity of asphalt.The application can realize the fast, stable prediction of zero shear viscosity based on dynamic shear test, and can reuse existing dynamic shear modulus master curve data, with the advantages of high test efficiency, strong engineering applicability.

The present invention relates to a damping medium (1) for use in a damper (2) for use in an accessory (3), preferably a furniture accessory, the damper (2) having a damper housing (4), at least one damping chamber (5) for containing the damping medium (1) and a piston (6) movable in the damping chamber (5) relative to the damper housing (4), the damping medium (1) being a mixture having a first fluid (7), preferably a first liquid and at least one second fluid (8), preferably a second liquid, wherein the at least one second fluid (8) in pure substance form before mixing with the first fluid (7) has, under otherwise identical conditions, a higher zero-shear viscosity than the first fluid (7) in pure substance form before mixing with the at least one second fluid (8), preferably 10 to 200,000 times higher, particularly preferably 100 to 10,000 times higher.

The invention relates to the technical field of fluoride-free anti-dripping agents, in particular to an efficient fluoride-free anti-dripping agent and a preparation method thereof.The efficient fluoride-free anti-dripping agent comprises a high-length-diameter-ratio silicon nanotube, a low-length-diameter-ratio silicon nanotube, modified PVP-b-PCL and a compound stabilizer. The high-length-diameter-ratio silicon nanotube is grafted with PEG, PBT molecules are effectively prevented from being linked to the surface of the silicon nanotube, and then the shrinkage rate of the formed material is controlled. The addition of the low-length-diameter-ratio silicon nanotubes prevents agglomeration caused by direct contact and tight winding of the high-length-diameter-ratio silicon nanotubes, and the introduction of the low-length-diameter-ratio silicon nanotubes can significantly improve the zero shear viscosity of a polymer melt and avoid warping and twisting of a product. The PCL chain segment of the modified PVP-b-PCL helps the high-length-diameter-ratio silicon nanotubes to be better fused into the PBT matrix, and the PVP segment prevents short nanotubes from mutually gathering due to polarity, so that the low-length-diameter-ratio silicon nanotubes can stably exist around the high-length-diameter-ratio silicon nanotubes to form a uniform mixture.

The present invention relates to a polypropylene composition suitable for healthcare applications comprising from 87.5 to 100.0 wt.-%, based on the total weight of the polypropylene composition, of a propylene-ethylene random copolymer, wherein the polypropylene composition in a first aspect has a melt flow rate MFR2 of from 23.0 to 37.0 g / 10 min, an ethylene content of from 2.5 to 4.0 wt.-%, content of xylene cold solubles (XCS) fraction of from 3.0 to 8.0 wt.-%, and a zero shear viscosity at 200°C, eta0, of from 925 to 1400 Pa·s, the polypropylene composition in a second aspect has an ethylene content of from 2.5 to 4.0 wt.-%, a zero shear viscosity at 200°C, eta0, of from 925 to 1400 Pa·s, a polydispersity index at 200°C, PDI, of from 2.5 to 5.5, a flexural modulus of from 950 to 1450 MPa, and an Enhanced Medical MAterial (EMMA) index of from 1.00 to 1.50, a process for producing said polypropylene composition, an article comprising said polypropylene composition and the use of said polypropylene composition for the production of an injection moulded article for healthcare applications.

The invention relates to the technical field of process simulation, and discloses an anti-slip mirror support compression molding process method and device based on simulation. The method comprises the following steps: inputting zero shear viscosity, relaxation time, shear thinning index, reference temperature and temperature sensitivity coefficient of a silica gel material into a Polyflow material database, and applying time nodes and pressure values of a quick charging stage, a slow charging stage and a pressure maintaining stage to an injection port of an anti-slip mirror holder mold cavity; setting a self-adaptive encrypted grid model, and solving phase volume fraction field distribution data of each grid unit in the self-adaptive encrypted grid model; and extracting a first filling depth value at the end moment of the quick filling stage, a second filling depth value at the end moment of the slow filling stage and a third filling depth value at the end moment of the pressure maintaining stage from the phase volume fraction field distribution data, and calculating a filling quality evaluation value. The problem that a traditional fixed viscosity model is low in prediction precision is solved, and the prediction precision of the filling depth is improved.

The application belongs to the technical field of high polymer materials, and discloses a polyolefin resin composition, a preparation method thereof, polyolefin foaming beads and a polyolefin molded body. The composition contains polyolefin, Janus sheets and optional functional additives. The thickness of the Janus sheets is less than or equal to 200 nm, and the cross-sectional side length is 100 nm to 2000 nm. The content of the Janus sheets is 0.008 to 0.1 parts by weight, and the content of the functional additives is 0 to 1 parts by weight, based on 100 parts by weight of the polyolefin. The composition has lower zero shear viscosity. The polyolefin foaming beads prepared by the composition have excellent cell structure, and the accumulation of the Janus sheets can be observed on the cell wall section, thereby playing a supporting and reinforcing role on the cells. The molded body prepared by the composition has excellent tensile properties, compression properties and thermal insulation properties.

The invention relates to a polymer flooding injection concentration determination method based on oil phase fluidity control. The method comprises the following steps: determining the minimum effective viscosity of an underground polymer solution required to meet fluidity control requirements based on an oil phase fluidity control criterion; estimating the front edge concentration of the polymer slug when the polymer slug migrates to the front edge in the stratum; the current ground injection concentration is subjected to stratum shear loss verification and compensation, and the shaft bottom zero shear viscosity is obtained; determining the ground zero shear viscosity of the ground injection liquid; the corresponding polymer concentration is reversely solved, and the minimum ground injection concentration is obtained; and updating the ground injection concentration and the permeability decrease coefficient, and carrying out iterative calculation until the difference between the minimum ground injection concentrations obtained by two adjacent iterations is smaller than a preset tolerance. By matching the polymer fluidity with the oil phase fluidity, microscopic fingering is inhibited, and the oil displacement efficiency is improved; the closed loop iteration is coupled with a multi-loss mechanism, parameter self-consistency is ensured, the concentration design precision is improved, and a more scientific engineering basis is provided for polymer flooding in the high water cut period.

The application discloses a kind of based on coarse-grained molecular dynamics asphalt zero shear viscosity simulation method, the method comprises the following steps: step 1, establish the full atom and coarse-grained model of asphalt;Step 2, obtain equilibrium structure by molecular dynamics simulation;Step 3, adopt SLLOD algorithm to apply shear flow field, simulate the rheological behavior of asphalt under different shear rate;Step 4, the frequency domain analysis of shear stress signal is carried out by fourier transform filter;Step 5, calculate shear rate and shear viscosity;Step 6, adopt Cross and Carreau model respectively to fit the zero shear viscosity of asphalt.Compared with prior art, the present application can break through the scale limit of traditional full atom simulation at low shear rate, significantly improve the signal-to-noise ratio of simulation, and for the first time, the zero shear viscosity plateau region of asphalt is obtained by simulation, which provides a feasible method for accurate simulation of asphalt high-temperature performance.