212results about How to "Increase the relative molecular mass" patented technology

The invention relates to a preparation method of instant ultra-high molecular weight polyacrylamide dry powder. The method comprises the following steps of: taking acrylic amide AM as a monomer, adopting a low-temperature composite initiation system taking NTP and K2S2O8 as main initiators, and an azo compound as an auxiliary initiator; adopting ammonia water and urea as cosolvents; and adding the initiator in batches and controlling the concentration of the cosolvent and the pH value of the medium, so as to obtain the instant ultra-high molecular weight polyacrylamide dry powder. The relative molecular weight range of the ultra-high molecular weight polyacrylamide PAM is that Mw is smaller than or equal to 25000000 and greater than or equal to 5000000. The optimal production technology is determined by discussing the influence factors such as the initiation system, the cosolvent concentration, and the pH value of the medium; the obtained polyacrylamide is rapidly dissolved, and is high in relative molecular weight, high in percent conversion, low in monomer content, high in production efficiency, low in cost and suitable for industrial production.

The present invention relates to preparation process of high molecular weight cation type polyacrylamide. The preparation process includes: mixing acrylamide and acrylyl oxyethyl trimethyl ammonium chloride in weight ratio of 1/99-99 in reactor and dissolving with added deionized water to total monomer concentration of 18-30 %; regulating system pH with ammonia water to 6-9; adding successively chain extender, reductant, disodium editate, urea, Span-20 and AIBN into the reactor with initiating temperature of 8-14 deg.c via stirring; introducing N2 to eliminate O2 for 30 min, adding oxidant ammonium persulfate and introducing for other 10 min; sealing for adiabatic polymerization; taking out the colloid block after the reaction system temperature is lowered to room temperature; pelletizing, stoving, crushing and sieving to obtain the powdered cation type polyacrylamide product.

The invention relates to an oil-displacing agent composition for improving a recovery ratio of a high-temperature reservoir and a preparation method of the composition, mainly solving the problems that a polymer-containing oil-displacing agent in the prior art is poor in temperature resistance, salt resistance and thermal stability resistance, and low in displacement efficiency. In order to solve the problems better, a following technical scheme is adopted as follows: the oil-displacing agent composition comprises the following components in percentage by weight: 0.005%-8.0% of high-temperature-resistant and oil-displacing acrylamide polymers, 0.005%-5.0% of a fatty alcohol polyoxyethylene ether carboxylate surfactant and 87.0%-99.99% of injected water. The preparation method of the oil-displacing agent composition comprises the following steps: regulating a pH value; ventilating a nitrogen gas and removing an oxygen gas; carrying out hydrolysis reaction; drying, crushing and sieving to obtain acrylamide polymers; stirring the acrylamide polymers, the fatty alcohol polyoxyethylene ether carboxylate and the injected water for 0.5 hour-5 hours at 5 DEG C-45 DEG C, and uniformly mixing to obtain the oil-displacing agent composition. And therefore, the oil-displacing agent composition can be used for tertiary oil recovery production of the high-temperature reservoir.

The invention discloses a preparation method of secondary-post-chain-extension waterborne polyurethane and a dispersing liquid prepared from waterborne polyurethane. According to the preparation method, the problems that the post-chain-extension reaction of water-soluble diamine is only limited on the hydrophilic surfaces of polyurethane emulsion particles at present, therefore, no effective chain extension is caused to oleophilic isocyanate groups remained in the polyurethane emulsion particles, and the relative molecular mass of waterborne polyurethane is difficult to be adequately increased are solved. The preparation method comprises the steps of reacting polymeric polylol with diisocyanate, a hydrophilic chain extender and a small molecule chain extender in the presence of a catalyst, adjusting the viscosity by virtue of a solvent so as to obtain a prepolymer, adding a neutralizer for neutralization, carrying out chain extension by virtue of a water-soluble chain extender, carrying out secondary post chain extension by virtue of an oil-soluble post chain extender, and decompressing to remove the solvent, so as to obtain the secondary-post-chain-extension waterborne polyurethane dispersing liquid. By virtue of a secondary-post-chain-extension method, the adequate reaction between the remained isocyanate groups of polyurethane and a post chain extender is realized, and the relative molecular mass of the waterborne polyurethane is rapidly and effectively increased.

The invention relates to a marine creep-resistant polyester high-strength low-elongation industrial yarn and its preparation method. The preparation method includes preparation of a creep-resistant polyester hyperviscous slice and preparation of a marine creep-resistant polyester high-strength low-elongation industrial yarn. According to the preparation method, polyester is tackified through solid phase polycondensation and then the tackified polyester is mixed with a fluorine-containing epoxy compound and a carbodiimide stabilizer to react so as to obtain the creep-resistant polyester hyperviscous slice; and the marine creep-resistant polyester high-strength low-elongation industrial yarn is prepared from the creep-resistant polyester hyperviscous slice by metering, extrusion, cooling, oiling, stretching, thermoforming and coiling. The marine creep-resistant polyester high-strength low-elongation industrial yarn provided by the invention has a certain creep resistance, hydrolysis resistance and stability, can be applied in a hot and humid environment for a long time, and has a huge application prospect in the fields of marine mooring ropes, fishing nets and the like.

The invention relates to modified bisphenol A-type epoxy resin and a preparation method thereof; the modified bisphenol A-type epoxy resin disclosed by the invention is a product obtained by reacting bisphenol epoxy resin and octadecanedicarboxylic acid under the effect of special catalyst; a carbon chain in a special structure is led into an epoxy resin molecule structure through the addition reaction of the modified bisphenol A-type epoxy resin and an epoxy group; the preparation method comprises the following steps: mixing epoxy resin and the octadecanedicarboxylic acid evenly; then, stirring a mixture under the protection of nitrogen while heating the mixture to 95-100 degrees centigrade; adding catalyst; keeping the reaction time of a reactant within 1.5-5 hours at a temperature when the temperature of the reactant reaches to 130-170 degrees centigrade; cooling the reactant; and discharging the reactant. According to the invention, the modified bisphenol A-type epoxy resin and the preparation method thereof have advantages of low reaction temperature, fast reaction speed, high yield, light color of the modified bisphenol A-type epoxy resin and good rigidity, toughness and chemistry resistance of modified curing epoxy resin.

The invention discloses a preparation method of an amphoteric humate coal water slurry dispersant. The preparation method comprises the following steps: preparing sulfomethylated humic acid by reaction of humic acid, formaldehyde and a sulfonating agent; then further performing cationization reaction on sulfomethylated humic acid and a cationic etherifying agent and finally dropping a cross-linking agent to perform cross-linking reaction so as to obtain the novel amphoteric humate coal water slurry dispersant. The method for preparing the coal water slurry dispersant comprises three steps of sulfomethylation, cationization and cross-linking reaction, and anionic and cationic groups are introduced on a matrix of the humic acid, so that the relative molecular weight of the dispersant is also increased; by using the novel dispersant, the apparent viscosity of the coal water slurry can be effectively reduced and the stability of the coal water slurry can be also obviously improved.

The invention discloses an epoxy resin flame-retardation composition and a preparation method thereof, belonging to the field of flame-retardation substances. The composition comprises, by mass, 75 to 90 parts of epoxy resin, 5 to 15 parts of a curing agent and 5 to 10 parts of a fire retardant, summing to 100 parts, wherein the fire retardant is a rational compound of poly(bisphenoxy)biphenol phosphorate (PBPP) and ammonium polyphosphate (APP). The fire retardant in the composition is high-efficiency halogen-free compound intumescent flame retardant, and overcomes the disadvantages of generation of heavy smoke and a great number of droplets in combustion of halogen fire retardants and the problem that a great addition amount of an inorganic fire retardant leads to changing of the mechanical properties of a material; the epoxy resin flame-retardation composition overcomes the problems of low heat stability, proneness to hydrolysis, difficulty in processing and proneness to migration in a matrix of conventional phosphorus-containing fire retardants, realizes synergistic flame retardation of multiple elements such as elemental nitrogen and elemental phosphorus, and has high flame retardation efficiency; and the preparation method for the epoxy resin flame-retardation composition is simple.

The invention relates to a chain extender for polyamide preparation through chain extending. The chain extender is prepared by the step of: reacting polymethyl methacrylate with styrene in a stainless steel reaction vessel equipped with a mixer, a condenser and a temperature control device as well as nitrogen atmosphere for 2-3h at a temperature of 108DEG C-112DEG C, thus obtaining a copolymer with a number-average molecular weight of 6000-7500 and a glass transition temperature of 50DEG C-60DEG C, with the styrene of 0.05 wt%-2 wt% in content. The invention also relates to application of the chain extender in a direct polymerization technology of polycaprolactam. Polycaprolactam slices obtained by a direct polymerization technology employing the chain extender have stable amino end group content, and high dyeing uniformity in a post processing process as well as good spinnability, thus being suitable for polyamide high-speed spinning and fine denier yarn production.

The invention relates to a water-repellent creep-resistant polyester fully drawn yarn (FDY) fiber and a preparation method thereof. The preparation method comprises the preparation of a creep-resistant polyester melt and the preparation of the water-repellent creep-resistant polyester FDY fiber; polyester is blended or added with a fluorine-containing epoxy compound during polyester synthesizing to obtain the creep-resistant polyester melt; then the creep-resistant polyester melt is subjected to metering, extruding, cooling, oiling, stretching and winding to obtain the water-repellent creep-resistant polyester FDY fiber, wherein the oiling operation refers to the operation of coating the surface of the water-repellent creep-resistant polyester FDY fiber with water repellents. The water-repellent creep-resistant polyester FDY fiber has certain creep resistance, hydrolysis resistance and performance stability, can be used in a humid field environment or a high-temperature high-humidity environment for a long time, and has great prospect in the fields of plastic packaging, waterproof fabrics, ropes, mooring ropes, marine fibers and the like.

The invention provides octade carbonyl tributyl citrate plasticizer and preparation method thereof. The composition of octade carbonyl tributyl citrate plasticizer (in mass percent): tributyl citrate 43.5-53.8%, octade carbonyl chloride 45.2-55.0%, catalyst 1.0-1.5%. The preparation method comprises: (1) adding citric acid, butylalcohol, water-carrying agent and catalyst into reaction kettle, stirring, heating up until reflowing to obtain tributyl citrate; (2) adding stearic acid into reaction kettle, stirring, heating up to 50 degree and then adding phosphorous trichloride and heating up to 75 degree to perform thermal insulating reaction for 3 hours and layering to obtain octade carbonyl chloride; (3) adding tributyl citrate and catalyst in the reaction kettle, stirring, heating up to 70 degree and then adding octade carbonyl chloride to obtain chlorine hydride and the chlorine hydride being absorbed in water containing soda in drier, when the pH of the water containing soda is constant, the reaction being stopped and the product being subjected to neutralizing, cleaning, pump filtering under reduced pressure to obtain octade carbonyl tributyl citrate.

The invention discloses a rare-earth complex rubber anti-aging agent, and a preparation method and application thereof. The preparation method of the rare-earth complex comprises the following steps: dissolving sodium sulfanilate in water to prepare a solution having a concentration of 5-60%; adding rare-earth salts of which the mole number is equivalent to 10-100% of the mole number of the sodium sulfanilate, and then performing stirring reaction at 40-95 DEG C for 2-24 hours; and filtering the obtained product, washing, and drying to obtain a powdered target product lanthanum sulfanilate. The rare-earth complex rubber anti-aging agent is applied in rubber preparation. According to the invention, the preparation method of the rare-earth complex rubber anti-aging agent is simple and easy to implement; and the rare-earth complex rubber anti-aging agent can obviously decelerate aging of rubber, can be singly used or compounded with other anti-aging agents for use, and has the advantages of causing no pollution to a rubber product, prolonging the scorching time of a rubber material, lowering the viscosity of the rubber material and the like.

The invention relates to a creep-resistant polyester ultralow-shrinkage industrial yarn and its preparation method. The preparation method includes preparation of a creep-resistant polyester hyperviscous slice and preparation of a creep-resistant polyester ultralow-shrinkage industrial yarn. According to the preparation method, polyester is tackified through solid phase polycondensation and then the tackified polyester is mixed with a fluorine-containing epoxy compound to react so as to obtain the creep-resistant polyester hyperviscous slice; and the creep-resistant polyester ultralow-shrinkage industrial yarn is prepared from the obtained creep-resistant polyester hyperviscous slice by metering, extrusion, cooling, oiling, stretching, thermoforming and coiling. The obtained creep-resistant polyester ultralow-shrinkage industrial yarn has a certain creep resistance, hydrolysis resistance and performance stability, can be used in a hot and humid environment for a long time, and has a huge prospect in the fields of plastic packing, waterproof fabric, ropes, cables, marine fiber and the like.

The invention discloses a high-wave-transparent light honeycomb sandwich bulletproof radome which comprises a radome main body. A concave cover body is in the radome main body, an inner core of the radome main body is a honeycomb layer for supporting, and an ultrahigh molecular weight polyethylene fiber layer for ballistic protection with a matched shape is outside the honeycomb layer. The radomemain body is cylindrical and comprises a side surface portion as a side surface and a bottom surface portion as a bottom surface, the side surface portion has an arc shape which is contracted at two ends of a middle ridge, the bottom surface portion is planar, the bottom surface portion and the side surface portion are connected by arc bending unit, the angle between the bottom surface portion andthe side surface portion is larger than or equal to 90 degrees and smaller than 120 degrees, and the bulletproof radome is made of ultrahigh molecular weight polyethylene as a raw material and has high wave transmission performance and bulletproof performance.

The invention relates to a creep-resistant polyester color yarn and its preparation method. The preparation method includes preparation of a creep-resistant polyester hyperviscous slice and preparation of a creep-resistant polyester color yarn. According to the preparation method, polyester is tackified through solid phase polycondensation and then the tackified polyester is mixed with a fluorine-containing epoxy compound to react so as to obtain the creep-resistant polyester hyperviscous slice; and the creep-resistant polyester color yarn is prepared from the obtained creep-resistant polyester hyperviscous slice by metering, mixing with a black masterbatch, extrusion, cooling, oiling, stretching and coiling. The creep-resistant polyester color yarn has a certain creep resistance, hydrolysis resistance and performance stability, can be used in a hot and humid environment for a long time, and has a huge prospect in the fields of automobile safety belts, bags fabric for military use, lifting belts and the like.

The invention provides water-borne wood paint, which comprises the following ingredients in percentage by weight: 10 to 20 parts of deionized water, 1 to 5 parts of propylene glycol, 1 to 3 parts of base association type thickening agents, 0.05 to 0.5 parts of dimethylethanolamine, 0.01 to 0.5 parts of non-silicone mineral oil system defoaming agents, 0.05 to 0.3 parts of water-borne carboxymethyl cellulose, 0.2 to 1.2 parts of ethanol, 60 to 80 parts of water-borne nanometer core-case crylic acid polymer dispersoid, 3 to 10 parts of water-borne fluorine-containing polyurethane nanometer dispersoid, 1 to 5 parts of alcohol ester twelve coalescing agents, 0.01 to 0.05 parts of fluorine flatting agents and 0.1 to 0.3 parts of anticorrosive and bacterium prevention agents. The water-borne wood paint has the advantages that the water-borne fluorine-containing polyurethane nanometer dispersoid is used as the core technology and is organically combined with water-borne auxiliaries such as the fluorine flatting agents, the problem that the wood surface cannot be easily moistened by the water-borne wood paint because the water surface tension is strong is solved, and the problems of poor paint film adhesion force, poor boiled water resistance and the like of the ordinary water-borne wood paint are solved. The invention also provides a preparation method of the water-borne wood paint at the same time.

The invention discloses a starch-based composite seed coating agent and a preparation method thereof and aims to solve the problems that common starch is poor in film formation property and easily lost through dissolution when being applied to a film forming agent; the requirements on the film formation property and the cohesiveness cannot be satisfied simultaneously when certain high-molecular film forming substance is used independently. The composite seed coating agent is divided into an inner layer and an outer layer, wherein the inner layer takes etherified starch as a base material, contains a bactericide, an insecticide, a plant growth inhibitor, a fertilizer and the like, and can be used for preventing diseases and insect pests of seeds to a certain extent; the outer layer takes the starch base a substrate; graft copolymerization of an acrylic acid monomer is triggered by free radicals to prepare a film layer and a water retaining layer; the film layer and the water retaining layer are good in cohesiveness and film formation property, can be used for protecting components of the inner layer from loss and also have water retention property and moisture retention property, so that the germination rate and planting percent of the seeds are increased. The starch-based composite seed coating agent disclosed by the invention is broad-spectrum and suitable for seed coatings of crops such as vegetables, flowers and grains.

The invention relates to a high-modulus low-shrinkage creep-resistant polyester industrial yarn and a preparation method thereof. The preparation method comprises the preparation of a high-viscosity creep-resistant polyester chip and the preparation of the high-modulus low-shrinkage creep-resistant polyester industrial yarn; polyester is subjected to solid phase polycondensation for viscosifying and then is blended and reacted with a fluorine-containing epoxy compound to obtain the high-viscosity creep-resistant polyester chip; then the high-viscosity creep-resistant polyester chip is subjected to metering, extruding, cooling, oiling, stretching, heat setting and winding to obtain the high-modulus low-shrinkage creep-resistant polyester industrial yarn. The high-modulus low-shrinkage creep-resistant polyester industrial yarn has certain creep resistance, hydrolysis resistance and performance stability, can be used in a high-temperature high-humidity environment for a long time, and has great prospect in the fields of plastic packaging, waterproof fabrics, ropes, mooring ropes, marine fibers and the like.