345 results about "Relative viscosity" patented technology

The invention discloses a lactobacillus leavening agent, a preparation method thereof and a special bacterial strain. The preservation serial number of lactobacillus is CCTCC M208151. An active constituent of the lactobacillus leavening agent is the lactobacillus. The invention also discloses a method for preparing the lactobacillus leavening agent, which comprises the following steps: firstly, leavening and culturing lactobacillus plantarum SC79 CCTCC M208151 in SC79 optimal culture medium; and secondly, collecting thallus in the step 1 and then adding a protective agent to the thallus to obtain the leavening agent. The lactobacillus leavening agent has small dosage, quick acid production speed through mixing the lactobacillus leavening agent and a harvestless exopolysacchatide yoghourt bacterial strain to prepare yoghourt, better relative viscosity, elasticity, denseness and adhesiveness than that of the conventional yogurt and small syneresis sensibility of formed sticky yogurt colloids, larger water holding capacity than that the conventional yogurt and hard whey separation.

A single probe system is utilized to quickly obtain uncontaminated formation fluid samples. The single probe includes an outer guard tube and an inner sampling tube which is slightly recessed relative to the outer tube such that the pressure at the front face of the probe is substantially uniform. Each tube is coupled to its own pump which controls the flow rate of the fluid moving through that tube. Knowing the size of the sampling tube relative to the size of the outer probe tube, and optionally based on relative viscosities of formation fluids and filtrates, the pumps are caused to generate a particular flow rate ratio through the tubes such that an appropriate pressure is maintained at the front face of the probe and such that the fluid flowing through the sampling tube is substantially uncontaminated.

A method for producing an artificial leather includes mixed spinning an island polymer and a sea polymer having a different dissolving property from that of the island polymer at a predetermined temperature, producing a non-woven substrate from the fiber obtained, immersing the non-woven substrate into a polymer, dissolving and removing the sea polymer in the non-woven substrate to obtain an artificial leather as a semi-finished product, and polishing the surface of the artificial leather to obtain an artificial leather having excellent dyeability and advanced fluff-like property. The ratio of melt flow index of the sea polymer to relative viscosity of the island polymer is about 20 to about 55, in which the relative viscosity of the island polymer is about 2.7 to about 3.5 and the weight percentage of the sea polymer relative to the sum of the sea polymer and the island polymer is about 30% to about 70%.

A sheath-core polyester fiber where the sheath includes an antimicrobial agent and the sheath comprises less than thirty percent of the total cross-sectional area of the fiber. The antimicrobial agent is selected such that the relative viscosity of the fiber lies above a defined spinnability limit, so that spinning is possible. With no loss in antimicrobial efficacy, the fiber of the present invention may be slickened with a siliconized finish in order to reduce fiber friction, thus giving the fiber a silky feel.

The invention discloses a high-flowability polymide composite which comprises the following components in parts by weight: 100 parts of thermoplasticity polymide, 0.5-10 parts of polybutylene, 15-70 parts of reinforcing material, 10-30 parts of fire retardant and 3-10 parts of other additives, wherein the melting point of the thermoplasticity polymide is 280-330 DEG C, and the relative viscosity of the thermoplasticity polymide is 2.0-2.3. The polymide composite provided by the invention has the advantages of high flowability and good mechanical processing property, and can meet thin wall and multi-cave forming requirements; the content of the gas in the obtained composite is less, the surface of the formed product is good, and raw materials can be obtained easily and are low in price; and the high-flowability polymide composite has a wide market space.

A polyamide resin composition comprising 100 parts by weight of a polyamide resin and 0.005 to 1.0 part by weight of at least one compound selected from the group consisting of a metal salt of a fatty acid, a diamide compound and a diester compound. The polyamide resin is obtained by solid phase-polymerizing a polyamide resin prepared by melt-polymerizing a diamine component containing 70 mol % or more of metaxylylenediamine and a dicarboxylic acid component containing 70 mol % or more of adipic acid, and preferably has a relative viscosity of 2.3 to 4.2 when measured at 25 DEG C. using a solution of 1 g polyamide resin in 100 ml of 96% sulfuric acid. By adding at least one compound selected from the group consisting of the specific metal salt of fatty acid, the diamide compound and the diester compound to a solid phase-polymerized polyamide resin, shaped articles such as films, sheets and hollow containers made of the solid phase-polymerized polyamide are improved in the resistance to whitening during storage tinder a high humid condition, upon contacting with water or boiling water, or upon heating to a glass transition temperature or higher.

The invention discloses a polyethylene/nylon alloy composite material and a preparation method thereof. The polyethylene/nylon alloy composite material is prepared from the following components in percentage by mass: 20-90% of recycled PE/PA (polyethylene/polyamide) composite membrane, 3-20% of thermoplastic elastic body graft, 5-50% of inorganic filler, 0.1-3% of chain extender, 0.1-1% of antioxidant, 0.1-1% of coupling agent, 0.2-3% of lubricating agent and 0.5-3% of other functional auxiliaries. The recycled waste PE/PA composite membrane is taken as a main raw material, thus the waste material is changed into things of value and resource recycling is realized. The thermoplastic elastic body graft is taken as a compatilizer, compatibility of PE and PA can be obviously improved, a homogeneous system in micro morphology is formed, comprehensive performance and impact toughness of the material are improved, and balanced physical mechanical properties can be obtained. The chain extender is adopted, molecular weight and relative viscosity of nylon can be effectively improved, and the defect that the physical mechanical properties are reduced owning to breaking of a molecular chain in a nylon regenerating process can be effectively avoided. The preparation method is a one-step method, production process is simple, and processing cost is low.

Provided is a continuous production method of a polyamide with stabilized polymerization degree and good quality, particularly an aromatic-containing polyamide. A continuous production method of a polyamide, comprising (a) a raw material preparation step of individually melting a diamine and a dicarboxylic acid, or producing a salt of amine and carboxylic acid in water, (b) a raw material introduction step of continuously introducing the prepared raw materials into a tubular reaction apparatus, (c) an amidation step of passing the introduced raw materials through the tubular reaction apparatus, thereby effecting amidation to obtain a reaction mixture containing an amidated product and a condensed water, (d) an initial polymerization step of introducing the reaction mixture into a continuous reaction apparatus capable of separation and removal of water, and elevating the polymerization degree while separating and removing water at a temperature higher than the melting point of the finally obtained polyamide to obtain a polyamide prepolymer, and (e) a final polymerization step of introducing the polyamide prepolymer into a continuous reaction apparatus capable of separation and removal of water, and further elevating the polymerization degree at a temperature higher than the melting point of the finally obtained polyamide to obtain a polyamide adjusted to a desired relative viscosity [RV].

A polylactic acid resin suitable for use especially in textile products; textile products obtained from the resin as a raw material (a fiber, multifilament, monofilament, staple, false-twist yarn, long-fiber nonwoven fabric, etc.); and processes for producing these textile products. The polylactic acid resin is a resin consisting mainly of a polylactic acid and is characterized in that it is linear, has an L-isomer content of 95 mol % or higher, an Sn content of 30 ppm or lower, a monomer content of 0.50 wt. % or lower, and has a relative viscosity of 2.7 to 3.9 or has a weight-average molecular weight of 120,000 to 220,000 and a number-average molecular weight of 60,000 to 110,000. Each of the textile products comprises the polylactic acid resin as the main material. The textile products each comprises a polylactic acid that is excellent in processability and excellent fiber properties. The free textile products are problems in practical use.

The invention discloses a PA10T polyamide resin. The relative viscosity of the PA10T polyamide resin in 98% concentrated sulfuric acid of 25 DEG C is 1.1-1.8; the terminal amino value of the PA10T polyamide resin is 20-60 mol/t, and the terminal carboxyl value is 70-130 mol/t; in the PA10T polyamide resin, benzoic acid accounts for 2-6 mol% of repetitive units; and the PA10T polyamide resin is prepared by adding polyfunctional compounds in a polymerization process and performing polymerization, wherein the amount of the polyfunctional compounds is 0.1-1 mol%. The invention also discloses a polyamide composition which comprises the following components in percentage by weight: 40-99wt% of PA10T polyamide resin, 0.8-89wt% of mineral filler and 0.2-1wt% of other assistants. The PA10T polyamide resin disclosed by the invention has low apparent viscosity in the melt condition and has high flowability; and the polyamide composition composed of the PA10T polyamide resin has high flowability and basically equivalent mechanical property, and can be used for occasions having high requirements for the dimensions of injection molding products.

The invention discloses a halogen-free flame retardant continuous long glass fiber reinforced polyamide 66 composite material which comprises the following ingredients by weight percent: 42-72.5% of polyamide 66, 2-6% of flexibilizer, 10-20% of halogen-free flame retardant, 0.5-2.0% of heat stabilizer and 15-30% of long glass fiber, wherein the relative viscosity of the polyamide 66 is 2.0-3.0; and the long glass fiber is an LFT (Long Fiber Thermoplastic) alkali-free continuous long glass fiber specially used for polyamide 66. The prepared material has high fluidity, excellent heat resistance, high rigidity, high impact, high size stability, excellent flame retardant property and high CTI (comparative tracking index) value; through detection, the tensile strength of the material is not less than 150MPa, the flexural modulus is not less than 7000MPa, the notch impact strength is not less than 15KJ/m<2>, the heat distortion temperature (1.80MPa) is not less than 250 DEG C, the flame retardant grade is UL94 1.6mmV-0, and the CTI value is not less than 500V; and moreover, the defect in halogen-free flame retardant high temperature decomposition is solved by using a technique of high-low-temperature double-melting body infiltration tank serial connection.

Device that can be used in an enhanced oil recovery method by injection of a solution of water soluble polymer and brine having a viscosity below 1000 cps that includes a mixer, and preferably a static mixer, capable of homogenizing the solution on-line; a device capable of measuring the viscosity of the homogenized solution, continuously, downstream of the solution injection pump, at a pressure below or equal to 250 bars, and preferably between 50 and 250 bars, and at a temperature below or equal to 120° C., and preferably between 40 and 120° C., by measuring a pressure drop in a calibrated tube, at a constant rate of flow.

A line resin tube includes a resin composition (C) including 60 to 230 parts by mass of polyamide resin (B) based on 100 parts by mass of polyamide resin (A), wherein the polyamide resin (B) includes 6-nylon and/or denatured 6-nylon, and has a bending modulus of elasticity of 1 GPa or less measured by ASTM D790; and the polyamide resin (A) is obtained by polymerization condensation of xylylene diamine and adipic acid, and has a relative viscosity from 2.0 to 6.0 measured at 25° C. in a solution of 98% concentrated sulfuric acid.

A method of producing a fuel hose material which is obtained at low costs and has excellent properties such as antistatic property, resistance to thermal aging and resistance to sour gasoline, and a material produced by the method. The method includes the steps of: dispersing a carbon nanotube in a polar plasticizer comprising at least one of a sulfonamide plasticizer and an ester plasticizer; and blending the resulting compound into a polyamide resin having a relative viscosity (ηr) of 2.5 to 3.5, in which the carbon nanotube is present in a proportion of not less than 7 wt %.

The invention relates to a figured sea-island ultrafine fiber, a preparing method and a process method of synthetic leather of the figured sea-island ultrafine fiber. The figured sea-island ultrafine fiber consists of a sea ingredient and an island ingredient, wherein the fiber degree of the figured sea-island ultrafine fiber is 3 to 8 deniers, in addition, the sea ingredient is low-density polyethylene, polyethylene, polystyrene, polypropylene, polylactic acid or vinol, the island ingredient is polycaprolactam, polyamide or polyester, the mass ratio of the island ingredient to the sea ingredient is 70/30 to 75/25, the density of the low-density polyethylene is between 0.915 g/cm<3> to 0.940g/cm<3>, and the melt index is 5.0+/- 0.7g/min, and the relative viscosity of the polycaprolactam is 2.80 +/- 0.04 Eta* gamma. The figured sea-island ultrafine fiber can be widely used for being made into shoes, sofas, garment leather, case and bag leather and leather for furniture and indoor decoration.

The invention discloses a polyamide resin A which has a relative viscosity of 1.2-1.8 in 98% concentrated sulfuric acid at 25 DEG C; the polyamide resin A has an amino end group value of 20-60 mol/t, and a carboxyl end group value of 70-130 mol/t; in the polyamide resin A, the proportion of benzoic acid in repetitive units is 2-6 mol%; the polyamide resin A is polymerized by adding polyfunctional compounds during the polymerization process; the adding amount of the polyfunctional compounds is 0.1-1 mol%. The polyamide composition comprises the following components: 31-99 wt% of polyamide resin A; 0-68 wt% of polyamide resin B; 0.8-40 wt% of mineral fillers; and 0.2-1 wt% of other additives. The polyamide resin A of the invention has low apparent viscosity under fusion conditions, has high fluidity; when a certain ratio of polyamide resin A is added into semi-aromatic polyamide, the prepared polyamide composition has high fluidity and comparable mechanical properties, and is applicable to conditions with high injection molding product dimension requirements.

A spun-dyed textured polylacted filament yarn according to the present invention comprises a textured polylacted filament yarn, wherein the textured polylacted filament yarn includes a filament having an approximately circular or circular cross-section and has a relative viscosity of 2.5 to 3.8, wherein the textured polylacted filament yarn contains a coloring agent in an amount of 0.01 to 3 mass %, and wherein the textured polylacted filament yarn is 1.75 to 3.5 cN/dtex in tenacity, 35 to 60% in elongation, 500 to 3,500 dtex in total fineness, 2.5 to 25 dtex in a filament fineness, 2 to 8% in hot water shrinkage ratio, and 5 to 25% in dry heat crimp ratio. By employing the above structure, a spun-dyed textured polylacted filament yarn excellent in loftiness, toughness and abrasion resistance can be obtained. It is preferable that the cross-section of the filament has a degree of deformation less than 1.5, the degree of deformation being expressed by a ratio (B/A) of a diameter B of an circumscribed circle of the filament cross-section to a diameter A of a inscribed circle of the filament cross-section.