114results about How to "The polymerization process is stable" patented technology

The invention relates to a novel neodymium (Nd)-based homogeneous rare earth catalyst as well as a preparation method and application thereof in conjugated diene polymerization. The synthesis method of the catalyst is simple and easy to control, and the homogeneous and stable catalyst with high activity can be obtained by utilizing the method. By utilizing the Nd-based homogeneous rare earth catalyst, a conjugated diene polymer can be synthesized, wherein, the cis-structure content of the polymer is more than 98%, the weight-average molecular weight of the polymer can be adjusted within the range of 1,000,000-2,500,000, and the molecular weight distribution (MWD) ranges from 3.0 to 4.0; and the polymerization process is stable and easy to control, thus being applicable to continuous technological operation.

The invention relates to a preparation method of nano silicone-acrylate core shell type composite latex for latex paints. The preparation method solves the problem that latex paints prepared from the common latex is insufficient to meet the demands of people at the performance aspects of water resistance, weather resistance, pollution resistance and the like, and simultaneously reduces the restraint degrees of a region domain and a time and season domain for latex construction. In the preparation method, active organic silicon and acrylate monomers are mainly used as raw materials, and then the nano silicone-acrylate core shell type composite latex using polyacrylate as a core and using silicone-acrylate composite resin as a shell is synthesized by adopting a monomer pre-emulsifying process and a seed semi-continuous latex polymerization method, so that the preparation method has the advantages of stable polymerization process and convenient large-scale production. When used for preparing the latex paints of outer walls, the synthesized latex can greatly improve all performance of the latex paints, also solve the conflicts between the lowest film-forming temperature and film hardness and simultaneously realize the unification of the cost and the performance.

Production of polyisoprene water latex, its gloves and related products is carried out by polymerization reacting for isoprene monomer, emulsifying agent and evocating agent by emulsion free-radical at normal-temperature and pressure or mixing polyisoprene water latex with other synthetic polymer. It has excellent strength and extensibility.

The invention belongs to the field of room temperature self-crosslinking materials, and discloses a room temperature self-crosslinking polyacrylate pressure-sensitive adhesive and a preparation method and application thereof. The method comprises the steps of preparing a pre-emulsion from 85-95 parts of acrylate soft monomer, 5-15 parts of hard monomer, 2-5 parts of functional monomer, 1.3-4 parts of emulgator and 30-55 parts of deionized water by mass fraction; then heating up the pre-emulsion, the deionized water, an initiator, the emulgator and a PH buffer agent for reaction; dripping a chain transfer agent, the pre-emulsion and an initiator solution when the emulsion shows blue light; adding ketone-containing carbonyl monomer, heating up together and reacting; then cooling down and regulating pH value to be 6.5-7.0; and adding hydrazide monomer, stirring and mixing uniformly, so as to obtain the room temperature self-crosslinking polyacrylate pressure-sensitive adhesive. The room temperature self-crosslinking polyacrylate pressure-sensitive adhesive prepared by the method has excellent indexes like excellent initial adhesive force, excellent persistent viscosity force and excellent peel strength, and can be used for preparing labels with good bond performance.

The invention relates to a kind of sym-form polydiene rubber with bimodal molecular weight distribution and the preparation method. The conjugated polydiene with bimodal / acromion molecular weight distribution can be produced in one single reactor directly. The invention is characterized by high catalytic activity, stable catalytic property, easy controllable polymerization and conjugated polydiene with structure unit larger than 96%. The polymer produced in this invention can not only retain mechanical performance of high molecular part, but aslo retains the processing performance of low molecular weight part.

The invention relates to a novel homogenous neodymium-based rare earth catalyst, and a preparation method of the catalyst and application in polymerization of conjugated diene. The synthesis method of the catalyst is simple and easy to control, thus the obtained catalyst has high activity and good stability. By using the inventive homogenous neodymium-based rare earth catalyst for catalyzing polymerization of isoprene, the polymerization process is stable, easy to control, and suitable for continuous operation, and polyisoprene with a cis structure content higher than 98% and adjustable Mooney viscosity range within 60-100 can be synthesized.

The invention relates to a manufacturing method of removable dentures. Currently, the removable-denture manufacturing methods in all countries in the world are a thermos-coagulation packing method, need steps such as casing, filling, squeezer pressurizing and water bath polymerization (dental cast cooking pot), are complex in process, time-consuming and labor consuming, are non-uniform in moldingcase pressurizing and are difficult in precise mastering and control of heating speed and heating maintaining time during heat processing. The method has the advantages that the manufacturing flow oftraditional removable dentures is improved, joint height increasing and contraction bubbles of the removable dentures manufactured by the traditional manufacturing process are avoided, and the base-material filling of the partial removable dentures and attachment dentures can be performed; the models of the attachment dentures does not need to be pressurized on a squeezer, and the subfissure or deformation of the fixing-part porcelain teeth of the attachment dentures is avoided.

The invention discloses an inverse emulsion drag reduction agent for fracturing a shale gas by using quick water and a preparation method thereof, and relates to the technical field of petroleum engineering. The inverse emulsion drag reduction agent is a macromolecular water soluble polymer which is prepared from acrylamide, sodium acrylate and dodecyl methacrylate copolymerized in an inverse emulsion, and azo diisobutyl hydrochloride and sodium hydrogen sulfite as complex initiation systems. A long-chain hydrophobic monomer is introduced into the drag reduction agent, so that the shear resistance of the drag reduction agent in a high displacement pump injection process is improved, meanwhile, the drag reduction agent is prepared from the inverse emulsion in a polymerization manner, the product is a liquor and instant, the liquor demands of a continuous mixed construction technology for fracturing the shale gas are met, the dosage for field use is 0.06-0.8% of mass of clean water, and the drag reduction rate can be up to 73%.

The invention discloses silicone acrylic emulsion and the application of the silicone acrylic emulsion as a textile finishing agent. The silicone acrylic emulsion is manufactured by the following raw materials in parts by weight: 24-30 parts of butyl acrylate, 6-14 parts of methyl methacrylate, 0.15-1.0 part of initiator, 42.9-67.7 parts of deionized water, 1.2-6 parts of compound emulsifier, 0.3-0.6 part of pH buffer agent, 1-5 parts of vinyltriethoxysilane and 0.1-0.3 part of ammonium hydroxide. The silicone acrylic emulsion of the invention has the advantages that the composition is simple, the consumption of organosilicone monomer is low, the hydrolyzation of siloxane can be efficiently reduced through the matching of the silicone acrylic emulsion and seed emulsion, the polymerization process and the finally obtained emulsion are stable, and the emulsion is high in solid content, low in viscosity and convenient to use; the emulsion is used as the textile finishing agent so as to enable the textile to gain better weight increment and anti-wrinkle performance under the condition of keeping whiteness and intensity, no methyl aldehyde is realized during finishing, preservation and use, and the emulsion has the characteristics of remarkable effect, environmental protection and low cost.

The invention relates to a polyisoprene aqueous emulsion and a method for preparing a glove and related products thereof. The polyisoprene aqueous emulsion is a stable polyisoprene rubber emulsion which is obtained by performing radical emulsion polymerization under normal pressure and the initiation of an initiator by taking isoprene as a monomer, taking an emulsifying agent and a dispersant as an emulsification system and adopting a redox initiation system, wherein an oil phase obtained after the isoprene and the initiator are mixed and a reducing agent are added dropwise together in a sectional dropwise adding way. The polymerization conversion rate of the polyisoprene aqueous emulsion of the invention is increased to be over 97.5 percent from original 78 percent; and a prepared polyisoprene glove and related thin emulsion products have the characteristics of high strength, high extensibility, good handfeel and no anaphylaxis to human bodies, and can meet the requirements of different purposes.

The invention relates to a high-shear reaction kettle which comprises a motor driving device, a stirring device, a kettle body, a clamping sleeve and a baffle plate, wherein the motor driving device is connected with the stirring device and is positioned on the top of the kettle body, and the stirring device is arranged in the kettle body; the clamping sleeve is arranged outside the kettle body, and the baffle plate is arranged in the kettle body; a material inlet, a material outlet and a kettle-inside temperature sensor inserting hole are formed in the kettle body, and a condensing medium inlet, a condensing medium outlet and a clamping sleeve temperature sensor inserting hole are formed in the clamping sleeve. The high-shear reaction kettle is applied to the production of the suspension polymerization polyethylene. Compared with the prior art, the reaction kettle can provide great radial shearing force, so that the generation of a dead angle in the reaction kettle is avoided. The polymerization reaction kettle is adopted to produce a polymerization product, namely the polyethylene, the molecular weight distribution and the particle size distribution of the polyethylene are narrow, the particle size of the polyethylene is uniform, the quality of finished products of the polymerization product is significantly improved and the rate of finished products of the polymerization product is significantly increased.

The invention discloses an elastic waterproof emulsion, and is characterized in the emulsion is obtained by the steps of carrying out emulsion polymerization of an olefinic compound (a) at least having one unsaturated group in one molecule, an olefinic compound (b) at least having two unsaturated groups in one molecule, an unsaturated compound (c) having a group which can undergo a cross-linking reaction at room temperature in a molecule and an unsaturated compound (d) having a carboxyl or anhydride group under the action of an emulsifier (e), and then adding a compound (f) which is soluble in water and can undergo a chemical cross-linking reaction with the compound (c) at room temperature. The produced elastic emulsion has the characteristics of excellent calcium ion stability, good compatibility with cement, excellent waterproof performance, good anti-cracking performance, simple preparation, low cost and the like, is suitable for the fields of concrete waterproof and cement waterproof mortar, building exterior wall coatings, adhesives and other biological materials, and is especially suitable for the foam concrete waterproof and cement waterproof mortar, the building exterior wall coatings and the like.

The invention discloses a powdery polycarboxylic acid water reducing agent and a preparation method therefor. The water reducing agent contains the following ingredients: 100 parts of macromonomer A, 10-20 parts of monomer B, 0.6-2 parts of initiator and 0.6-2 parts of chain transfer agent, wherein the macromonomer A is R1-O-[CH2-CH2O]m-[CH2-CH(CH3)O]n-R2; and the monomer B is liquid-state unsaturated carboxylic acid. The method comprises the steps: mixing the macromonomer A with 5% to 20% of the monomer B, heating the mixture to 50 DEG C to 70 DEG C, and adding 60% to 80% of the initiator into the mixture; dropwise adding a mixed solution of the chain transfer agent and the rest of the monomer B, wherein the time for dropwise adding is 2 to 4 hours, 60% to 85% of the mixed solution is dropwise added uniformly in first 1/2 to 2/3 of the time, and the rest of the mixed solution is dropwise added uniformly in remaining time; and carrying out a heat-preservation reaction for 1 to 2 hours, and then, carrying out cooling and crushing. The powdery polycarboxylic acid water reducing agent disclosed by the invention is good in dispersity, high in water reducing rate, small in blended amount and good in slump loss resistant performance.

The invention relates to a system for producing modified coal tar pitch and a preparation method of the modified coal tar pitch. The method comprises the following steps: feeding mid-temperature pitch from a revaporizer of a tar processing device into modified intermediate pitch processing equipment with a flash oil-gas treatment device through a pipeline, allowing the flash oil and gas generated by flashing through a vacuum flasher to enter heavy oil treatment equipment for performing separation and condensation recycling on heavy wash oil fraction, and feeding the modified intermediate pitch generated by flashing into pitch modification reaction equipment for producing modified coal tar pitch. According to the system and the method, various indexes of the modified coal tar pitch are obviously improved, the energy and power consumption is greatly reduced, and pollutant escape in the whole reaction process is avoided.

The invention belongs to a catalyzing system for isoprene polymerization and preparation and an application method of the catalyzing system. The catalyzing system is composed of A) rare earth organic carboxylate compound, B) organic aluminum compound, C) activating agent, D) acrylate compound and E) carboxylic aromatic cyclic ester compound containing total carbon number of C7-C9 according to molar ratios that A:B=1:1-30, A:C=1:1-3, A:D=1:1-60, and A:E=1:5-50. The prepared catalyzing system forms pre-polymerized catalyst activity central body during ageing at 0-80 DEG C. The catalyzing system can be maintained for 180 days at the room temperature, the monomer conversion rate is higher than 98% in polymerization, the molecular weight distribution index of the synthesized poly-isoprene rubber is 1.6-2.8, cis-form 1,4 structural unit content is higher than 96%, and the Mooney viscosity satisfies that ML1+4100 DEG C =40-80.

The invention discloses an epoxy modified acrylic emulsion and a preparation method thereof. The epoxy modified acrylic emulsion comprises three components A, B and C, wherein the component A comprises deionized water, an emulsifier, epoxy resin, an acylamino compound, styrene, acrylate, methacrylate and (meth)acrylic acid; the component B comprises deionized water, a buffer agent and an emulsifier; the component C comprises deionized water and an initiator; in the emulsion system, a reducing agent, protective glue, a functional monomer, a neutralizing agent and the like can also be included.The prepared emulsion has the characteristics of fine granules, good elasticity, light resistance, weather resistance, water resistance and the like, and can be applied to waterborne industrial coating, waterborne building coating and waterborne wood coating. The waterborne coating prepared from the emulsion provided by the invention has the characteristics of strong adhesion, high mechanical properties, low curing shrinkage, good water/oil resistance, good temperature change resistance, good heat resistance, excellent aging resistance, excellent electrical insulation, excellent chemical resistance and the like.

The invention discloses a printing adhesive and a preparation method thereof, printing paste and clothing. The printing adhesive is prepared from the following components in parts by weight: 40-70 parts of a cool silicone emulsion, 0.6-1.0 part of an emulsifier, 36-59 parts of deionized water, 80-100 parts of soft monomer, 10-30 parts of a hard monomer, 0.6-3.0 parts of an emulsifier, 0.2-0.6 part of a pH buffer agent, 50-60 parts of deionized water, 0.2-0.6 part of an initiator and 1-4 parts of a cross-linking monomer. The printing adhesive has the advantages of low viscosity and good heat dispersion and has a relatively high polymerization reaction rate, and the obtained polymer is high in molecular weight.

The invention relates to a preparation method of a high-strength graphene expandable polystyrene board. The prepared product has the mechanical strength higher than that of other existing expendable polystyrene boards. The method comprises the several steps as follows: preparing a modified graphene pre-dispersion liquid; adding an oily dispersant to prepare an oily mixed liquid; preparing graphene polystyrene particles through suspension polymerization in a reaction kettle; finally, measuring mechanical properties after molding with pre-expansion, curing and board making processes. The prepared graphene expandable polystyrene board has excellent mechanical properties, has the tensile strength 400% higher than the national standard and has the compressive strength 200% higher than the national standard. With the adoption of the method, the application of expandable polystyrene in the packaging industry is expanded, expandable polystyrene is suitable for packaging industries with higher mechanical properties, such as packaging of precise instruments, packaging of spaceflight navigation parts and the like, and the advantages of polystyrene as a packaging material are played.

The invention discloses a water-based acrylate adhesive for reflective coatings and a preparation method thereof. The water-based acrylate adhesive comprises the raw materials in parts by weight: 8-10 parts of perfluoroalkyl phosphate amine salt, 0.5-1.5 parts of heterogeneous tridecyl alcohol polyoxyethylene (40) ether, 6-7 parts of diacetone acrylamide, 3-4 parts of adipic dihydrazide, 1-2 parts of vinyl-containing functional silicon oil, 145-155 parts of ethyl acrylate, 30-40 part of methyl methacrylate, 2-4 parts of acrylic acid, 1-1.4 parts of ammonium persulfate and 280 parts of deionized water. An emulsion is obtained through semicontinuous emulsion polymerization; the adhesive and the inorganic material are in high binding firmness, and the adhesive is abrasion-proof, weather-resistant, stain-proof and high in film-forming transparency.

The present invention discloses a composite polymer sludge dewatering agent and a preparation method thereof. The preparation method comprises: (1) respectively preparing a non-ionic monomer, an anionic monomer and a cationic monomer into aqueous solutions with deionized water, mixing, adjusting the pH value to 2-6, introducing nitrogen, and stirring; (2) adding a persulfate initiator, a sulfite reducing agent, an azo initiator and EDTA-2Na to the mixed solution prepared in the step (1), controlling the reaction temperature at 25-50 DEG C, and triggering a chain initiation and chain extending reaction; and (3) after the reaction in the step (2) is performed for 2-4 h, adding an inorganic salt, completely stirring, continuously introducing nitrogen to react for 1-3 h, discharging the material, and sequentially carrying out drying, crushing and granulation on the obtained colloid so as to obtain the sludge dewatering agent. The sludge dewatering agent of the present invention has advantages of complex water body conditioning, low consumption, low cost, thick floc, no residual toxic-harmful monomer, low moisture content of the treated sludge, inorganic suspended solids, good treatment effect, and the like.

The invention relates to a preparation method of a ternary polyacrylonitrile copolymer, which comprises the steps of heating an aqueous solution of maleic anhydride, acrylamide and a dispersing agent to 55-75 DEG C under a nitrogen shielding condition, adding acrylonitrile to keep constant temperature for 20-30min, adding an initiator solution for reaction for 3-12h, and carrying out washing, demonomerisation, filtration and drying. The method employs a mixed solvent precipitation polymerization method for polymerization and has the advantages of high reaction yield, high viscosity average molecular weight, narrow distribution, easiness in temperature control, stable product quality and the like. The thermal property of the polyacrylonitrile copolymer prepared by the method can be effectively improved, and the copolymer has certain practical application prospects.