42 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.

For each of different resins R, a zero shear viscosity no of each resin R is obtained by using a conversion function expression whose parameters are a melt flow rate (MFR) and a set temperature of a heating cylinder and is registered. Also, a purge resin required amount Wu corresponding to a viscosity difference ηd between the zero shear viscosity ηof of a former resin Rf and the zero shear viscosity ηos of a succeeding resin Rs is registered. When resin switching is performed, the zero shear viscosity ηof of the former resin Rf and the zero shear viscosity ηos of the succeeding resin Rs are obtained by inputting the MFR of the former resin Rf and the MFR of the succeeding resin Rs to a molding machine controller, the viscosity difference ηd between the zero shear viscosity ηof of the former resin Rf and the zero shear viscosity ηos of the succeeding resin Rs is obtained, an amount of a purge resin required for resin switching is obtained as a purge resin required amount Wu, and at least the obtained purge resin required amount Wu is displayed.

The invention relates to a liquid crystal polymer, a liquid crystal composition and a preparation method and application thereof. The zero-shear viscosity of the liquid crystal polymer is 3500-8000 Pa.s, and the melting enthalpy is greater than or equal to 1.2 J / g. The liquid crystal composition prepared from the liquid crystal polymer disclosed by the invention is not easy to fall powder under the ultrasonic action, has good flatness, also has good weld line strength, and is very suitable for preparing optical instrument parts, especially camera module workpieces.

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 invention belongs to the technical field of evaporation equipment, and relates to a scraping plate design method of a wiped-film evaporator, which comprises the following steps: (1) determining an application scene, and acquiring the total length of a single-row scraping plate of a wiped-film section, the section number n, the inter-section mounting interval, and eta 01 and eta 0n at an upper end inlet and a lower end outlet according to actual production experience; (2) acquiring eta0i and mi slotting proportions corresponding to the ith section; (3) establishing a wiped film section model; (4) verifying the model after n times of flow field and evaporation simulation; (5) aiming at the ith section, establishing mi film scraping section models, and enabling the slotting proportion of a scraping plate to correspond to that of the ith section; and (6) performing flow field and evaporation simulation once on the mi wiped membrane section models (the zero shear viscosity of the material is equal to the eta0i corresponding to the ith section) to obtain mi cluster membrane exchange fluxes, taking the wiped membrane section model with the maximum cluster membrane exchange flux as the optimal wiped membrane section model of the ith section, and setting the parameters of the ith section to be the same as the optimal wiped membrane section model of the ith section.

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 invention discloses a bottle brush type polymer containing a pH-responsive poly-alpha-lysine side chain, and belongs to the technical field of high-molecular compounds, the structural formula of the polymer is as follows: # imgabs0 #, and a preparation method comprises the following specific steps: (1) taking 6-amino protected L-lysine-NCA as a monomer, adding primary amine containing polymerizable double bonds, and reacting at the temperature of 60-80 DEG C for 1-2 hours; initiating a ring-opening polymerization reaction of the monomer to obtain a 6-amino protected L-lysine macromonomer containing polymerizable double bonds at the tail end; and (2) reacting the macromonomer under the action of a catalyst or an initiator to obtain the bottle brush type polymer containing the pH responsive poly-alpha-lysine side chain. The high-density side chain modified bottle brush type polymer prepared by the invention has zero shear viscosity, low entanglement platform modulus and unique mechanical and rheological properties, and polypeptide is adopted as a side chain of the bottle brush type polymer, so that the biocompatibility of the bottle brush type polymer can be improved, and the functionality of the bottle brush type polymer can be enriched.

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 present invention belongs to the technical field of evaporation equipment and relates to a design method for the scraper of a wiped film evaporator, including the steps of: (1) determining the application scenario, obtaining the total length of a single-row scraper in the wiped film section, the number of sections n and the installation interval between sections, as well as η at the upper inlet and η at the lower outlet according to actual production experience 01 , η 0n ; (2) obtaining the corresponding η of the i-th section 0i and the grooving ratio of m i ; (3) establishing a model of one wiped film section; (4) verifying after performing n times of flow field and evaporation simulations on this model; (5) for the i-th section, establishing m i models of wiped film sections, the grooving ratio of whose scrapers corresponds to that of the i-th section; (6) performing one flow field and evaporation simulation on each of these m i models of wiped film sections (the zero shear viscosity of the material is the same as the corresponding η of the i-th section 0i ), obtaining m i mass transfer fluxes of the mass transfer film, and taking the model of the wiped film section with the largest mass transfer flux of the mass transfer film as the best model of the wiped film section of the i-th section, and setting the parameters of the i-th section the same as those of the best model of the wiped film section of the i-th section.

The invention discloses a bottle brush type polymer of poly-alpha-glutamic acid with pH responsiveness on a side chain, and belongs to the technical field of high-molecular compounds, the structural formula of the polymer is as follows: # imgabs0 #, and a preparation method comprises the following specific steps: (1) taking L-glutamic acid-NCA protected by gamma-carboxyl as a monomer, adding primary amine containing polymerizable double bonds, and reacting for 1-2 hours; initiating a ring-opening polymerization reaction of the monomer to obtain a macromolecular monomer of gamma-carboxyl protected L-glutamic acid containing polymerizable double bonds at the tail end; and (2) reacting the macromonomer under the action of a catalyst or an initiator to obtain the bottle brush type polymer with the pH-responsive poly-alpha-glutamic acid on the side chain. The high-density side chain modified bottle brush type polymer prepared by the invention has zero shear viscosity and low entanglement platform modulus, and presents unique mechanical and rheological properties, and the stimuli-responsive polypeptide is adopted as the side chain of the bottle brush type polymer, so that the biocompatibility of the bottle brush type polymer can be improved, and the functionality of the bottle brush type polymer can be enriched.

The present invention provides a non-woven fabric having both excellent particle collection efficiency and air permeability, and the main object of the present invention is a long-fiber non-woven fabric comprising fibers containing a polypropylene-based resin, the fibers having an average fiber diameter of 0.05-5.00 [mu] m inclusive, and the average fiber diameter of the fibers being less than 0.05 [mu] m and less than 5.00 [mu] m, and the average fiber diameter of the fibers being less than 0.05 [mu] m and less than 5.00 [mu] m. The long fiber non-woven fabric has a zero shear viscosity at 190 DEG C of from 5 Pa * s to 10 Pa * s (inclusive).

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.

A polyethylene resin composition, a method for producing the same, and a molded article containing the same are provided. The polyethylene resin composition contains a polyethylene resin formed by sequentially using a first reactor and a second reactor. The zero-shear viscosity (η01) of the polyethylene resin formed in the first reactor at 180 °C is from 10 6 Poise to 10 8 Poise, and the number of short-chain branches per 1000 carbons (SCB1) by 13 C-NMR is from 5.0 to 20. The ratio of the zero-shear viscosity of the polyethylene resin formed in the first reactor to that of the polyethylene resin formed in the second reactor at 180 °C (η01 / η02) is from 10 to 100. The ratio of the number of short-chain branches per 1000 carbons (SCB1 / SCB2) by 13 C-NMR is from 2 to 20, and the density difference (D2-D1) is from 0.01 g / cm 3 to 0.05 g / cm 3 .

For each of different resins R, a zero shear viscosity ηo of each resin R is obtained by using a conversion function expression whose parameters are a melt flow rate (MFR) and a set temperature of a heating cylinder and is registered. Also, a purge resin required amount Wu corresponding to a viscosity difference ηd between the zero shear viscosity ηof of a former resin Rf and the zero shear viscosity ηos of a succeeding resin Rs is registered. When resin switching is performed, the zero shear viscosity ηof of the former resin Rf and the zero shear viscosity ηos of the succeeding resin Rs are obtained by inputting the MFR of the former resin Rf and the MFR of the succeeding resin Rs to a molding machine controller, the viscosity difference ηd between the zero shear viscosity ηof of the former resin Rf and the zero shear viscosity ηos of the succeeding resin Rs is obtained, an amount of a purge resin required for resin switching is obtained as a purge resin required amount Wu, and at least the obtained purge resin required amount Wu is displayed.