39 results about "Viscous modulus" patented technology

A hot melt adhesive composition, comprising a blend of components including about 10% to about 40% by weight of an elastomeric block copolymer, preferably styrene-isoprene-styrene (SIS) or styrene-butadiene-styrene (SBS), about 15% to about 70% by weight of a first midblock tackifying resin having a softening point of at least about 110° C. and having an aromatic content of at least about 1.5% by weight; about 0 to 55% of second midblock tackifying resin, about 5% to about 35% by weight of a plasticizer; and about 0% to about 20% by weight of an end block resin having a softening point lower than 125° C.; wherein the components total 100% by weight of the composition, the viscosity of the composition is equal to or less than about 20,000 mPa.s at 120° C., and is applied at a temperature lower that 150° C. and initial bond retention of the composition on elastic strands is at least about 60%. Also, the elastic modulus G′ of the composition is higher than about 5000 Pa, the vicous modules G″ is higher than about 50 Pa, and the tan delta value is between about 0.5 and about 60. Laminates, especially those used in disposable soft goods, and methods of making such laminates are also described. The adhesive composition and/or laminate may be used in making a variety of end products such as a disposable diaper, a sanitary napkin, a bed pad, a bandage, a surgical drape, a tape, a label, a plastic sheet, a nonwoven sheet, a paper sheet, a cardboard, a book, a filter, or a package.

The invention relates to a wood based flooring material having an upper surface and a backing surface, the wood based flooring material comprising one or more layers, wherein the backing surface has a coating of a thermoplastic composition, wherein the thermoplastic composition has a ratio elastic modulus G′ to viscous modulus G″, G′/G″, of less than or equal to about 5 at 0.001 Hz and 25° C. The invention also relates to a method of producing the flooring material.

The invention relates to gel prepared from chitosan or chitosan derivatives by multi-crosslinking and a preparation method. By multi-crosslinking chitosan or the chitosan derivatives, the elasticity modulus and the viscous modulus of the gel are increased and the swelling degree of the gel is reduced under the condition that the crosslinking degree of the gel is not increased. The elasticity modulus and the viscous modulus of the chitosan gel can be further increased each time one crosslinking is increased in the multi-crosslinking process, and the viscoelastic modulus of the gel can be increased by multi-crosslinking under the condition of equal crosslinking degree. The crosslinking times of the chitosan gel are selected according to characteristics of the viscoelastic modulus of different tissue parts, so that the viscoelastic modulus of the chitosan gel is matched with the related tissue, the histocompatibility of the gel in the tissue can be improved, and the use quantity of a crosslinking agent which is irritant or toxic to a human body can be reduced. The gel is applied to the field of soft tissue in tissue engineering such as tissue filling and repair, joint viscoelasticity replenishers, biological scaffolds, anti-cicatricial, anti-adhesion and biological glue and the like.

The invention provides a preparation method of a completely new gel form, namely a critical gel, wherein with carboxymethyl chitin as a raw material and natural and non-toxic amino acid, namely lysine, as a modifying substance, the critical gel is prepared under the catalytic action of a coupling reagent, namely 4-(4,6-dimethoxytriazin-2-yl)-4-methyl morpholine hydrochloride (DMTMM). The gel has the main characteristic that the gel can constantly keep viscous modulus and elasticity modulus equal, which is to say the gel possesses two properties, namely high viscosity and high elasticity. The modified gel, which is under a 'critical state', can achieve terminal sterilization, prolong an in vivo residue time and achieve single-dose injection; with the application of the non-toxic amino acid modifying substance, the intrinsic biocompatibility and bio-activity of the carboxymethyl chitin are reserved, and all potential risks are avoided; since the viscous modulus and the elasticity modulus are simultaneously increased and are constantly kept equal, the viscoelasticity of the carboxymethyl chitin is enhanced; and meanwhile, the original liquid state of the carboxymethyl chitin is kept, so that pain in injection can be relieved easily.

A tire for a motor vehicle includes at least one carcass ply, a belt structure radially external to the at least one carcass ply, a tread band radially external to the belt structure, a pair of sidewalls axially-external to the at least one carcass ply, and a pair of beads. The beads include bead wires or circumferentially-inextensible annular inserts. Opposite lateral edges of the at least one carcass ply are associated with respective beads. The at least one carcass ply includes a first composition having an elastic modulus at 70° C. less than or equal to 5.0 MPa and a viscous modulus at 70° C. less than or equal to 0.50 MPa. The sidewalls include a second composition having an elastic modulus at 70° C. greater than or equal to 3.5 MPa and a viscous modulus at 70° C. less than or equal to 0.50 MPa.

The invention provides an ultrasonic tissue mimicking phantom as well as a preparation method and application thereof. The ultrasonic tissue mimicking phantom is prepared by performing a cross-linking reaction on a mixed liquid of a polyacrylamide mixture, water, scatters and glycerinum. By controlling the components of the polyacrylamide mixture, the elasticity modulus of the ultrasonic tissue mimicking phantom is adjusted and controlled, and by adding glycerinum, the viscous modulus of the ultrasonic tissue mimicking phantom is adjusted and controlled, so that adjustability of the elasticity modulus and the viscous modulus of the ultrasonic tissue mimicking phantom is achieved, and relatively rich possibility of the ultrasonic tissue mimicking phantom in inspection and calibration of ultrasonic imaging instruments is provided.

The invention relates to a cross-linked hyaluronic acid gel. The gel has an elastic modulus of from about 10 Pa to about 1000 Pa at 1 Hz, the viscous modulus of the gel is from about 10 Pa to about 500 Pa at 1 Hz, the ratio tandelta value of the viscous modulus to the elastic modulus of the gel is about 0.4 to about 1.5 at 1 Hz, and the cohesive force is from about 2N to about 10 N. The invention also relates to a preparation method and application of the cross-linked hyaluronic acid gel.

The invention belongs to the technical field of rubber detection, and particularly relates to an evaluation method and device for pre-crosslinking of a carcass ply rubber compound and a computer readable carrier medium. According to the evaluation method for pre-crosslinking of the carcass ply rubber compound, the elastic modulus and the viscous modulus obtained through strain scanning of a rubber processing analyzer are used for drawing corresponding to strain changes, a curve not only can reflect the modulus, but also can visually distinguish the elastic modulus and the viscous modulus of the rubber compound, and therefore the pre-crosslinking of the carcass ply rubber compound is evaluated. And deducing the pre-crosslinking rate of the carcass ply after electron irradiation according to the curve area. The method provided by the invention is simple to operate, high in sensitivity, accurate and reliable in test result and free of environmental pollution.

Tire having two beads each comprising an annular reinforcing structure and a carcass reinforcement which is anchored in the two beads by being wrapped around the annular reinforcing structure so as to form, in each bead, a main portion and a wrapped-around portion, wherein each bead comprises an apex situated between the main portion and the wrapped-around portion of the carcass reinforcement, and an outer strip positioned axially on the outside of the carcass reinforcement and of the apex, the apex and the outer strip being made of a rubber compound that has an elastic modulus G′ less than or equal to 15 MPa and a viscous modulus G″ such that: G″ [MPa]≦0.2·G′ [MPa]−0.2 MPa, the elastic and viscous moduli being measured at 23° C.; wherein the entity formed by the apex and the outer strip has a thickness E(r), the thickness E(r) varying such that, in the range of distances r comprised between 25 and 45% of the height H of the tire, the variation in thickness

is less than or equal to −0.25 mm/mm over at least 4% of the height H of the tire, that, in the range of distances r comprised between 15 and 35% of the height H, the variation in thickness

is greater than or equal to 0.20 mm/mm over at least 2% of the height H of the tire, and that, in the range of distances r comprised between 10 and 20% of the height H of the tire, the variation in thickness

is greater than or equal to −0.10 mm/mm and less than or equal to 0.0 mm/mm over at least 5% of the height H of the tire.

The invention relates to the field of tire production and manufacturing, in particular to a rubber composition with ultralow abrasion and ultralow rolling resistance for production, a screening method of the rubber composition and a tire adopting the composition. The rubber composition comprises two rubber components and a filler comprising at least white carbon black, wherein the rubber components are microscopically phase-separated into two phases in a rubber compound, and the two rubber components exhibits different peak temperatures in a temperature scanning curve of a viscous modulus G''. The rubber composition is ulcanized to obtain a G'' value and the peak temperature of a temperature scanning curve of T1 and T2, the temperature corresponding to the peak with a low temperature is recorded as T1, and the temperature corresponding to the peak with a high temperature is recorded as T2, wherein the relationship between T1 and T2 needs to meet the condition that T2-T1 is more than 0 DEG C and less than 20 DEG C. According to the invention, G'' is used for characterizing Tg, polymers with different Tg are not used for obtaining a partial microcosmic phase separation effect, and finally the tire tread rubber composition with good rolling resistance and abrasion balance is obtained.

The invention provides cationic-anionic surfactant mixed system gel and a preparation method thereof. The preparation method for the gel comprises the following steps: exchanging a halide ion in a cationic hydrocarbon surfactant solution into a hydroxyl ion through an anionic exchanger to obtain a solution A, and calibrating concentration of the solution A through a standard HCl solution; adding an anionic fluorocarbon fatty acid surfactant and the solution A into tri-distilled water, wherein the sum of concentration of anionic fluorocarbon fatty acid surfactant and solute in the solution A is 0.050-0.130mol.L<-1>, and a molar ratio of the anionic fluorocarbon fatty acid surfactant to the solute in the solution A is (8:2)-(1:1); heating until the hydrocarbon surfactant is completely dissolved, and reacting for 30-60 minutes; cooling the solution to the room temperature and keeping the temperature for 4-8 weeks at 25-50 DEG C after centrifuging and removing foams, so as to obtain the gel. The gel has high elasticity modulus and high viscous modulus, the elasticity is far higher than the viscidity, the gel is formed by closely packing polyhedral vesicles and novel in structure.

Tyre comprising two beads (20) comprising an annular reinforcing structure (70) and a carcass reinforcement (60) which is anchored in the two beads by being wrapped around the annular reinforcing structure so as to form, in each bead, a main portion (62) and a wrapped-around portion (63), in which each bead comprises a bead filler (110) situated between the main portion and the wrapped-around portion of the carcass reinforcement, and an outer strip (120) positioned axially on the outside of the carcass reinforcement and of the bead filler, the bead filler (110) and the outer strip (120) being made of a rubber compound that has an elastic modulus G' less than or equal to 15 MPa and a viscous modulus G" such that: G"[MPa] <= 0.2 G' [MPa] - 0.2 MPa, the elastic and viscous moduli being measured at 23 DEG C; in which the entity formed by the bead filler (110) and the outer strip (120) has a thickness E(r), the thickness E(r) changes as a function of the distance r such that, in the range of distances r comprised between 25 and 45 % of the height H of the tyre, the variation in thickness (X) is less than or equal to - 0.25 mm/mm over at least 4 % of the height H of the tyre, and in which the annular reinforcing structure has a maximum axial width DE such that the ratio (Y), where E(r)max is the maximum value of the thickness E(r), is less than or equal to 10%.

An ink or coating composition is rheologically tested at three or more temperatures which substantially cover the anticipated range of printing operation temperatures expected to be encountered during printing to determine the value of the rheological parameters viscous modulus, phase angle and phase-angle slope, and to identify values of these parameters encountered during printing around which the structural behavior of the ink or coating changes. An ink composition that has a phase angle of at least 55°, a viscous modulus of at least 150 Pa, and a phase-angle slope of at least −0.5°/° C. exhibits low misting when employed in high speed printing apparatus.

The invention provides a preparation method of emulsified cross-linked sodium hyaluronate gel microspheres for injection. The preparation method comprises the following steps: firstly, preparing an emulsion of sodium hyaluronate microsphere particles; adding a cross-linking agent into the emulsion according to a certain mass ratio of the cross-linking agent to the sodium hyaluronate;, stirring anduniformly mixing the components in an ice bath, then stirring the mixture at room temperature to carry out primary reaction; and finally stirring the reactant in a water bath at 35-42 DEG C to reactto obtain a microsphere emulsion; cleaning the reaction product with n-hexane, ethyl acetate and absolute ethyl alcohol in sequence. According to the preparation method, uniform and ordered cross-linking reaction in a single sodium hyaluronate colloidal particle is ensured, so that proper viscous modulus, elastic modulus and pushing force are obtained, cross-linking reaction among the particles isavoided, and the yield of qualified gel microspheres is increased. The gel microsphere is suitable for injection and has a wide application prospect.

The invention provides tomato peel soluble dietary fiber interpenetrating colloid and a preparation method thereof. Concretely, the interpenetrating colloid provided by the invention has excellent elastic modulus, viscous modulus and hardness, and also has the characteristics of low cost, environment-friendly effect, high safety coefficient and natural ingredients.

The invention discloses a photonic crystal based on 3D printing and a preparation method thereof. The preparation method comprises the following steps that S1, slurry is prepared, the elasticity modulus of the slurry is larger than the viscous modulus, the slurry has viscoelastic inversion performance, the slurry is prepared from polydimethylsiloxane and a ceramic material, the slurry is divided into slurry A and slurry B; the dielectric constant of the slurry A is not equal to that of the slurry B; S2, a first crystal layer is formed from the slurry A and forming a second crystal layer from the slurry B by film-free direct-writing 3D printing equipment, and the first crystal layer and the second crystal layer are stacked to form a wood pile structure to obtain a photonic crystal semi-finished product; and S3, the photonic crystal semi-finished product is cured to obtain the photonic crystal. According to the preparation method, the process is simple, the prepared photonic crystal is high in precision, the stealth of terahertz waves with different frequency bands can be realized, and the applied wave band can be in a range of 10 GHz-10 THz.

Disclosed are methods of making anhydrous antiperspirant gel-solid stick compositions comprising a particulate antiperspirant active; a solid non-polymeric gellant that is substantially free of dibenzylidene alditol, n-acyl amino acid derivatives, organic polymeric gellants, and inorganic thickening agents; and an anhydrous liquid carrier having an average solubility parameter of from about 3 to about 13 (cal/cm<3>)<0.5>, wherein the composition has a visible residue index of from about 11 to about 30 L-value, a product hardness of from about 500 gram.force to about 5,000 gram.force, a rheology profile defined by a ratio of an elastic modulus (G') to a viscous modulus (G'') of from about 0.1 to about 100. The refractive indices of the particulate antiperspirant active, solid non-polymeric gellant, and anhydrous liquid carrier are not matched. The solid non-polymeric gellant is preferably a crystalline material having an average particle size of less than about 1 mu m, and/or has an elongated particle morphology having an aspect ratio of greater than about 2. These antiperspirant gel-solid stick compositions made in accordance with the methods herein provide improved low residue performance, efficacy and aesthetics.

Disclosed are anhydrous antiperspirant gel-solid stick compositions which comprise a particulate antiperspirant active; a solid non-polymeric gellant that is substantially free of dibenzylidene alditol, n-acyl amino acid derivatives, organic polymeric gellants, and inorganic thickening agents; and an anhydrous liquid carrier having an average solubility parameter of from about 3 to about 13 (cal/cm<3>)<0.5>, wherein the composition has a visible residue index of from about 11 to about 30 L-value, a product hardness of from about 500 gram.force to about 5,000 gram.force, a rheology profile defined by a ratio of an elastic modulus (G') to a viscous modulus (G'') of from about 0.1 to about 100. The refractive indices of the particulate antiperspirant active, solid non-polymeric gellant, and anhydrous liquid carrier are not matched. The solid non-polymeric gellant is preferably a crystalline material having an average particle size of less than about 1 mu m, and/or has an elongated particle morphology having an aspect ratio of greater than about 2. These antiperspirant gel-solid stick compositions provide improved low residue performance, antiperspirant and aesthetics.

A microneedle manufacturing method according to one embodiment of the present invention comprises the steps: selecting and providing a microneedle material, wherein a value of the viscosity/elasticity coefficient of the microneedle material, measured for each shear rate by a viscoelasticity measurement apparatus, belongs to a scope between pre-arranged upper and lower limits; and manufacturing the microneedle material having been selected and provided in the previous step into a microneedle by means of an elongation method.

The invention discloses a method for measuring the gelling point of emulsified asphalt, and belongs to the field of road engineering. The method is characterized in that the temperature correspondingto the condition that the elastic modulus of the emulsified asphalt is equal to the viscous modulus or the temperature when the tangent value of the phase angle is equal to 1 is taken as the gelling point. Compared with the prior art, the method has the advantages that the storage stability and demulsification speed of different emulsified asphalt can be conveniently and quickly identified by calculating the gelling point, and the method has good popularization and application values.