332 results about "Shear viscosity" patented technology

Methods and compositions are disclosed for controlled addition of components that decrease the viscosity of the viscoelastic surfactant fluids or for controlled changes in the electrolyte concentration or composition of the viscoelastic surfactant fluids. One aspect of the invention relates to the use of internal breakers with a delayed activation. Another aspect of the invention relates to the use of precursors that release a breaking system such as alcohol by a process such as melting, slow dissolution, reaction with a compound present in the fluid or added to the fluid during or after the step of injecting, rupture of an encapsulating coating and de-adsorption of a breaking agent absorbed into solid particles. In another aspect of the invention, alcohols are included in a pad to reduce the low-shear viscosity and reduce the resistance to flow of the treatment fluids during a desired phase of the treatment.

Methods and compositions are disclosed for controlled addition of components that decrease the viscosity of the viscoelastic surfactant fluids or for controlled changes in the electrolyte concentration or composition of the viscoelastic surfactant fluids. One aspect of the invention relates to the use of internal breakers with a delayed activation. Another aspect of the invention relates to the use of precursors that release a breaking system such as alcohol by a process such as melting, slow dissolution, reaction with a compound present in the fluid or added to the fluid during or after the step of injecting, rupture of an encapsulating coating and de-adsorption of a breaking agent absorbed into solid particles. In another aspect of the invention, alcohols are included in a pad to reduce the low-shear viscosity and reduce the resistance to flow of the treatment fluids during a desired phase of the treatment.

Water soluble nonionic friction reducers and added to coacervate gels having excellent shear viscosities and other properties. A preferred gel comprises poly diallyl dimethyl ammonium chloride, a lesser amount of sodium lauryl sulfonate, and lauryl alcohol. Excellent friction reducing properties are manifested; a particularly practical use for the compositions is in subterranean formation fracturing.

The invention relates to the technical field of an oil-based drilling fluid for petroleum drilling, in particular to an environmental-friendly type oil-based drilling fluid and a preparation method therefore. The environmental-friendly type oil-based drilling fluid is prepared from the following raw materials: base liquid white oil, calcium chloride water solution, an emulsifying agent, a wetting agent, organic oil for drilling fluid, a composite plugging agent, a shear strength improving agent, a basicity regulating agent and a fluid loss additive; and a weighting agent is added into a mixture of the raw materials. The oil-based drilling fluid has the following advantages of: good plugging property, high shear viscosity and strong rock carrying capability; the EC 50 (median effect concentration) of the drilling fluid is larger than 3*104mg/L; the drilling fluid has good environmental safety; the return permeability of the drilling fluid can reach 90%-98%; the drilling fluid has little damage to reservoirs; the preparation process of the drilling fluid is simple; the drilling fluid is mainly applied to a special construction technology such as underbalance, horizontal wells and the like, water sensitivity reservoirs and low-pressure low permeability gas wells.

A method for determining a shear elasticity and shear viscosity of a material based on resonance characteristics. A focused ultrasound wave is directed at the material to induce oscillations in the material, and a velocity of the material is measured. A spectrum of frequency of oscillation versus velocity is developed, and the resonance characteristics exhibited by the spectrum are used to estimate the shear elasticity and viscosity of the material.

The present invention refers to a method of producing a coated paper or paperboard, but excluding photographic papers, comprising the steps of: (a) forming a free flowing curtain comprising at least one layer, whereby the composition forming at least one layer of the free flowing curtain has a high shear viscosity of at least about 50 mPa.s, and (b) contacting the curtain with a continuous web substrate of basepaper and paperboard.

Living cells are modified at their surface with specially selected polymers. Covalently attaching specially selected polyethylene glycol (PEG) derivatives to the surface of red blood cells (RBC) in aqueous media under mild conditions is a preferred example. The selected PEG derivatives dramatically reduced aggregation and low shear viscosity of RBC resuspended in autologous plasma, and inhibited RBC agglutination by blood group-specific antibodies. The morphology and deformability of the PEG-treated cells were unaltered. PEG coating of the RBC surface is applicable to the treatment of a variety of diseases characterized by vaso-occlusion or impaired blood flow, e.g., myocardial infarction, shock, and sickle cell disease. An infusion solution is prepared containing red blood cells covalently bound to a PEG derivative having a molecular weight of between 2,000 and 5,000 Daltons and a PEG derivative having a molecular weight between 10,000 and 35,000 Daltons.

Non-thermoplastic starch fibers having no melting point and having apparent peak wet tensile stress greater than about 0.2 MegaPascals (MPa). The fibers can be manufactured from a composition comprising a modified starch and a cross-linking agent. The composition can have a shear viscosity from about 1 Pascal.Seconds to about 80 Pascal.Seconds and an apparent extensional viscosity in the range of from about 150 Pascal.Seconds to about 13,000 Pascal.Seconds. The composition can comprise from about 50% to about 75% by weight of a modified starch; from about 0.1% to about 10% by weight of an aldehyde cross-linking agent; and from about 25% to about 50% by weight of water. Prior to cross-linking, the modified starch can have a weight average molecular weight greater than about 100,000 g/mol.

The invention relates to a method for producing polyester filament yarn with hollow porous structure and better wet adsorption function, wherein it uses two kinds of soluble polyester chips with high and low shearing viscosities to be high-speed spinned with normal polyester chip, to change the components of polyester chip, to be dried and processed via hollow ejection plate, POY-DT production line or FDY one-time production time to obtain the hollow polymer filament yarn. Via alkali reduction treatment, and watched under electric scanning fiber scope, the surface of fiber is uniformly distributed with micro concaves, the section has through micro holes, while its wet adsorption property is better than present one.

Ethylene-based resin, which exhibits a satisfactorily high melt tension and can provide a molded object excellent in mechanical strength, the ethylene-based resin characterized in simultaneously satisfying the requirements [1] to [5] described below: [1] melt flow rate (MFR) under a loading of 2.16 kg at 190° C. is in the range of 0.1 to 100 g/10 minutes;

• [2] density (d) is in the range of 875 to 970 kg/m³;
• [3] ratio [MT/η*(g/P)] of melt tension [MT(g)] at 190° C. to shearing viscosity [η*(P)] at 200° C. at an angular velocity of 1.0 rad/sec. is in the range of 1.50×10⁻⁴ to 9.00×10⁻⁴;
• [4] sum [(A+B)(/1000C)] of the number of methyl branches [A(/1000C)] and the number of ethyl branches [B(/1000C)] per 1000 carbon atoms measured by ¹³C-NMR is 1.8 or less; and
• [5] zero shear viscosity [η₀(P)] at 200° C. and weight-average molecular weight (Mw) measured by GPC-viscosity detector method (GPC-VISCO) satisfy the following relational expression (Eq-1):

0.01×⁻¹³×Mw^3.4≦η₀≦4.5×10⁻¹³×Mw^3.4  (Eq-1)

The invention provides a zwitterionic gemini viscoelasticity surfactant, a preparing method thereof and clean fracturing fluid with the zwitterionic viscoelasticity surfactant as a thickening agent. The clean fracturing fluid prepared with the method is simple in material, low in cost, obvious in microcosmic net structure, good in viscoelasticity, excellent in sand suspending performance and thorough in gel breaking, and the clean fracturing fluid has the maximal advantage of being good in temperature resistance; the shear viscosity of the best product at the temperature below 160 DEG C is larger than or equal to 130 mPa.s, and is much larger than 25 mPa.s of the site construction requirement of the clean fracturing fluid.

The invention relates to a method for printing a fluid material using a continuous jet printing technique, wherein the material is passed under pressure from a reservoir through a channel to at least one outflow opening of the channel, after which the material is passed through the outflow opening, whereby the pressure in at least a part of the channel upstream of the outflow opening is in the interval of 15-600 bars [≡15·10⁵ to 600·10⁵ Pa], and whereby the fluid material comprises a curable composition which comprises: a) a component A in an amount in the range of from 1-15 wt % which component A has a dielectric constant larger than 15 (at 0° C.); b) an ionically dissolved lipophilic salt in an amount in the range of from 1-15 wt %, c) optionally (a) coating additive(s) in an amount of at most 10 wt %, and d) for the remaining part a liquid component B which comprises a curable monomer and/or a curable oligomer, which liquid component B has a low shear viscosity (at 22° C.) in the range of from 50-1500 mPas, whereby liquid components A and B are compatible with each other, and all amounts are based upon total composition. The invention further relates to said curable composition and articles comprising said composition.

The invention discloses a device and a method for online measuring a polymer melt rheological parameter. The device comprises a temperature control device, wherein a storage chamber is formed in the temperature control device; a piston is arranged above the storage chamber, and a plurality of capillary opening molds which are spaced to one another are sequentially arranged below the storage chamber from top to bottom; the storage chamber is connected to a fused plasticizing section of an extruder through a melt pump, the melt pump is used for introducing the polymer melt into the storage chamber from the fused plasticizing section of the extruder, and the polymer melt in the storage chamber can be sequentially extruded from a plurality of capillary opening molds under the extrusion of the piston. By adopting the device, the Bagley and Rabinowitsch correction can be synchronously carried out, the real shear viscosity of the material can be measured in real time, and the instantaneous tensile viscosity of the melt can be measured by utilizing a Cogswell method; in addition, the wall slippage phenomenon of the melt can be researched by replacing different capillary opening molds in different sizes. Compared with the traditional offline measurement method, the device and the method have the advantages that the rheological behavior of the material in a processing device can be really reflected.

The invention relates to a lubricating oil, and specifically discloses a special engine oil for improving the engine oil combustion phenomenon of turbocharged engine and a preparation method thereof. The special engine oil includes base oil and additives; the base oil includes polyester, polyol ester, synthetic olefin (PAO), synthetic alkane, alkyl naphthalene and class II hydrotreated base oil; and the additives include a compound agent, a viscosity index improver and a pour point depressant. The invention also provides a preparation method of the special engine oil. The special engine oil provided by the invention has high flash point and high temperature-high shear viscosity, and has greatly reduced evaporation loss. At the same time, the engine oil meets the grade requirements of API SN. The special engine oil provided by the invention can greatly reduce the engine oil combustion phenomenon of turbocharged engine.

A liquid composition free from N-alkylpyrrolidones and hydroxyl amine and its derivatives, having a dynamic shear viscosity at 50° C. of from 1 to 10 mPas as measured by rotational viscometry and comprising based on the complete weight of the composition, (A) of from 40 to 99.95% by weight of a polar organic solvent exhibiting in the presence of dissolved tetramethylammonium hydroxide (B) a constant removal rate at 50° C. for a 30 nm thick polymeric barrier anti-reflective layer containing deep UV absorbing chromophoric groups, (B) of from 0.05 to <0.5% of a quaternary ammonium hydroxide, and (C) <5% by weight of water; method for its preparation, a method for manufacturing electrical devices and its use for removing negative-tone and positive-tone photoresists and post etch residues in the manufacture of 3D Stacked Integrated Circuits and 3D Wafer Level Packagings by way of patterning Through Silicon Vias and/or by plating and bumping.

The invention relates to a method for manufacturing modified extra fine heavy calcium carbonate powder; polyglycol and water are evenly mixed according to a mass ratio of 1:1 to get fluid A which is added from an inlet orifice of a muller and enters the muller together with coarse fodder entering the muller; the coarse fodder is continuously grinded to be fine, ceaselessly mixed to be even with the fluid A, and evenly wrapped simultaneously; wrapped modified extra fine heavy calcium carbonate powder is separated after entering a grader through wind, thus obtaining modified extra fine heavy calcium carbonate powder. The modified extra fine heavy calcium carbonate of the invention not only ensures retaining of characteristics of modified extra fine heavy calcium carbonate powder, but can improve lipophilicity, wettability and disperse stability of powder body. After applied to a latex system, the modified extra fine heavy calcium carbonate powder obtained by the invention can improve hydrophobic mature of a dope system, rinse resistant times, high shear viscosity of a latex system, construction property, and reduce dosage of moistening dispersant and foam suppressor in the meanwhile.

A lubricating oil composition of the present invention for an internal combustion engine is prepared by blending (A) a perbasic calcium sulfonate and/or a perbasic calcium phenate having a TBN of 200 mgKOH/g or higher, (B) predetermined binuclear and/or trinuclear organic molybdenum compounds, and (C) a polyalkyl (meth)acrylate having an SSI of 30 or lower into a lubricating base oil composed of a mineral oil and/or a synthetic oil, in which the total content of molybdenum derived from the binuclear and trinuclear organic molybdenum compounds is 0.025% by mass or higher based on the total amount of the composition, and in which the lubricating oil composition has a high-temperature high-shear viscosity at 100° C. of 4.0 to 5.0 mPa·s, a high-temperature high-shear viscosity at 150° C. of 2.5 mPa·s or lower and a NOACK value (250° C., 1 hr) of 15% by mass or less.

The invention discloses an aqueous latex paint with high solid and low-viscosity, wherein the coating viscosity is regulated by associative thickeners, such as hydrophobic modified polyaminoester HEUR, hydrophobic modified Polyether HPE and/or hydrophobic modified alkaline expansive emulsion HASE, and the pigment and filler ground paint-pulp is dispersed by associative dispersants, and the moderate-high-low PVC aqueous latex paint used is 20-60 percent in total paint by weight of bonding emulsion. In the invention, the organic pigment and filler particle surface is modified by associative dispersant to enable the organic pigment and filler particle surface to be drawn into the thickening-network, so as to meet requires for lower shear viscosity of the coating and direct construction without dilution with water. The coating abandons conventional hydration thickening method, and all adopts associative thickeners to regulate the coating viscosity, so the coating has good low thixotropy; while the bonding latex particles and pigment and filler particle with function of fill and color are homogeneously distributed more ideally, therefore the coating has no layer phenomenon appeared which is caused by syneresis.

An artificial turf comprising a turf yarn prepared from an ethylene-based polymer composition comprising less than or equal to 100 percent by weight of the units derived from ethylene; and less than 30 percent by weight of units derived from one or more α-olefin comonomers; wherein said ethylene-based polymer composition is characterized by having a Comonomer Distribution Constant of equal to or greater than 40, a vinyl unsaturation of less than 100 vinyls per one million carbon atoms present in the backbone of the ethylene-based polymer composition; a zero shear viscosity ratio (ZSVR) equal to or greater than 1.75; a density in the range of 0.915 to 0.930 g/cm³, a melt index (1₂) in the range of from 0.8 to 5 g/10 minutes, a molecular weight distribution (M_w/M_n) in the range of from 2 to 3.6, and a molecular weight distribution (M_z/M_w) equal to or less than 3; and wherein the turf yarn exhibits one or more of the following properties (a) shrink of less than 4.8%, and (b) curl of less than 0.5 is provided.

A lubricating oil composition which exceeds the fuel saving performance of a conventional low viscosity lubricating oil composition, contains (A) a lubricating base oil having a % C_A of 2 or less, adjusted to a 100° C. kinematic viscosity of 1.5 to 4.5 mm²/s and (B) a viscosity index improver including (B1) a poly(meth)acrylate having a weight-average molecular weight of 50,000 or less in an amount of 1 to 10 percent by mass and (B2) a poly(meth)acrylate having a weight-average molecular weight of 100,000 to 250,000 in an amount of 0.1 to 5 percent by mass of the total composition. The composition has a 80° C. high-shear viscosity (Vs: mPa·s) and a 80° C. kinematic viscosity (Vk: mm²/s) ratio (Vs/Vk) of less than 1, a coefficient of traction of 0.02 or less at 40° C., an average speed of 3.0 m/s, a slip ratio of 10%, and a contact pressure of 0.4 GPa.

The invention relates to a method for producing an adhesive tape intended more particularly for wrapping cables, comprising an open textile carrier and a pressure-sensitive adhesive coated on one side thereof. A shear viscosity of the pressure-sensitive adhesive, at a temperature of 25 DEG C. during coating from dispersion, is 200 to 100 000 Pa*s at a shear rate of 10-2 s-1 and is 0.1 to 10 Pa*s at a shear rate of 100 s-1.