1136 results about "Dimethyldiazene" patented technology

The invention relates to a drilling fluid plugging agent while drilling, comprising 60-100 parts of plant fibers, 5-20 parts of asphalt, 5-15 parts of graphite and 5-20 parts of weak water absorbent gel by weight. The weak water absorbent gel is a polymer which has mean grain size of 200-20 meshes and water absorbent multiple of 10-100g.g-1 and is prepared by reacting 20-60 parts of monomer, 0.05-1.0 part of potassium peroxydisulfate, 0.05-1.0 part of sodium bisulfite, 0.005-0.5 part of methylene-bis-acrylamide and 2-10 parts of inorganic fillers by weight under constant temperature of 20-60 DEG C for 8-12h by way of aqueous solution polymerization, drying and pelleting, wherein the polymeric monomer is one or more of acrylamide, acrylic acid, dimethyl diallyl ammonium chloride and 2-acrylamide-2-methyl propanesulfonic acid. The plugging agent has little effect on the rheological property of the drilling fluid, can reduce the API filtration and the coefficient of friction resistance of the drilling fluid in an auxiliary manner and is suitable for controlling leakage of and plugging the windows with high density and narrow pressure.

A homopolymer of a monomer selected from those having the general formula:

wherein: R1 is H or CH3; R2 is H or an alkyl group having from 1 to about 4 carbon atoms; A is a straight or branched chain alkyl group having from 1 to 10 carbon atoms; and R5, R6, and R7 each are independently an alkyl group having from 1 to 6 carbon atoms; or a copolymer of such monomers as acrylate, acrylamide or methacrylamide may be used to disperse metal sulfides prior to their forming scales during the production and transportation of crude oil. Terpolymers of dimethyldiallylammonium salt, 2-hydroxypropyl acrylate; and acrylic acid may also be used for this purpose. The production fluid may also be treated with a compound that promotes the formation of dispersible sulfide scales.

The invention relates to amphiprotic high-molecule chelated flocculating agent for various heavy metal waste water treatments and preparation method thereof. The amphiprotic high-molecule chelated flocculating agent of the invention is formed by following steps: configuring a basic skeleton by cationic dimethyl diallyl ammonium chloride and acrylamide copolymer; reacting with aldehydes and polyamine through Mannich to connect the polyamine to the high-molecule chain; then reacting with carbon bisulfide in alkaline condition. The invention mainly overcomes the disadvantages that the existing high-molecule chelating agent has excessive flocs negative charge caused by the suspension of part chelating radical because the space steric resistance of high-molecule chain and chelated radical are not matched so as to reduce the flocculating settling performance and the traditional heavy metal waste water processing method has complicated technique, high cost, low efficiency and cannot be suitable for large-scaled heavy metal waste water treatment. The invention is widely applied to the heavy metal waste water treatment of various types, in particular suitable for removing the heavy metal ions in industrial waste water and domestic sewage.

The invention relates to a grafted copolymerized cationic polysaccharide bioflocculant and a preparing method thereof. A product with the cationic degree (DC) of 3-63% is finally prepared through an aqueous solution polymerization technology with a present nonionic polysaccharide bioflocculant (Dx) as a raw material, one or more of dimethyl diallyl ammonium chloride (DMDAAC), methacryloxyethyltrimethyl ammonium chloride (DMC), acryloyloxyethyltrimethyl ammonium chloride (DAC), dimethylaminoethyl methacrylate (DMAEMA), dimethylaminoethyl acrylate (DMAEA) as a monomer, and one or two of ammonium persulfate/sodium bisulfate and dibenzoyl peroxide (BPO) (AIBA) as an initiator. The preparation method is simple, and is easy to control, and the product obtained in the invention has good flocculation effect and high treatment efficiency, and can be widely used in the field of treatment various sewages, the sludge dewatering field and the like.

The invention relates to an AM (Acrylamide)/DMDAAC (Dimethyl Diallyl Ammonium Chloride)/cyclodextrin polymer filtrate reducer used in petroleum and gas drilling fluid and a preparation method thereof. The invention can solve the technical problems that a well wall is not stable as water loss increases at the pit bottom under the condition of high temperature, and the like. The AM/DMDAAC/cyclodextrin polymer filtrate reducer is characterized by comprising three monomers of AM, DMDAAC and cyclodextrin; the preparation method comprises the following steps of: firstly adding the AM and the DMDAAC into an allyl cyclodextrin water solution according to the mol ratio among the allyl cyclodextrin water solution, the AM and the DMDAAC of 69.2-84.2:30-15:0.8 in sequence; then adding a chelating agent, an oxidant and a reducing agent in sequence; finally evenly mixing, then injecting nitrogen for 20-40min and deoxidizing, and reacting at 30-50 DEG C for 6-8h to obtain the AM/DMDAAC/cyclodextrin polymer filtrate reducer. The preparation method of the polymer is simple, convenient and available and mild in reaction conditions; and the polymer has good filtrate reduction effect in the drilling fluid, is resistant to temperature up to more than 250 DEG C and used in the petroleum and gas drilling fluid.

The invention discloses a salt-resistant and calcium-resistant filtrate reducer applied to a drilling fluid and a preparation method of the filtrate reducer. The filtrate reducer is prepared from raw materials and water, wherein the raw materials comprise 2-acrylamide-2-methyl propane sulfonic acid, acrylic acid, acrylamide and dimethyl diallyl ammonium chloride; the ratio of m(2-acrylamide-2-methyl propane sulfonic acid) to m(acrylic acid) to m(acrylamide) to m(dimethyl diallyl ammonium chloride) to m(initiator) to m(molecular weight control agent) is (40-60) to (6-10) to (30-40) to (5-9) to (1-2) to (0.1-0.5). The molecular weight of the salt-resistant and calcium-resistant filtrate reducer applied to the drilling fluid and prepared by the preparation method is greatly improved; the coating property, the inhibition property, the heat stability and the salt-resistant and calcium-resistant pollution capacity of the filtrate reducer are greatly improved; by virtue of the salt-resistant and calcium-resistant filtrate reducer applied to the drilling fluid, the rheological property of the drilling fluid can be greatly improved; the salt-resistant and calcium-resistant filtrate reducer applied to the drilling fluid also has a high temperature-resistant effect at 150-180 DEG C.

The invention relates to a cationic polymer coating agent for water-base drilling fluid, which has the following structural formula, wherein A is a first monomer which is selected from one of N,N-dimethylacrylamide, acrylamide or N,N-diethylacrylamide, B is a second monomer which is selected from one of methacryloyloxyethyl trimethyl ammonium chloride, dimethyldiallylammonium chloride or acryloyloxyethyl trimethyl ammonium chloride, and C is a third monomer which is selected from 2-acrylamido-2-methylpropanesulfonic acid, vinyl sulfonic acid or methacrylic acid, wherein x is 40-120, y is 1-20, and z is 1-10. The invention also relates to a preparation method of the cationic polymer coating agent. When the cationic polymer coating agent of the invention is used for a water-base drilling fluid system, the cationic polymer coating agent has good rock debris coating effect and can improve the performance of the water-base drilling fluid system.

The invention relates to an oil field fluid loss additive for drilling liquid and its producing method and the application of the treating agent in the process of producing drilling liquid system. The treating agent utilizes the cation monomer dimethyl diallyl ammonium chloride can make the sodium lignin sulfonate and the sulfonated-methyl brown coal graft induced by FeCl3 so as to produce a new fluid loss agent with the resistance to salt and collapse at high temperature. The composed product integrates the brown coal and lignin. The cation introduction improves the resistance to collapse. The weak crosslinking function of the Fe3+ makes the heat resistance improved further based on the brown coal. Therefore, the product can be widely applied in different complicated conditions such as high temperature deep well, gypsum/slat bed, stratum with a bad water sensitivity, fragility stratum and etc. and has a good prospect.

The invention discloses a PFS-PDMDAAC compound coagulant, a corresponding preparation method and an application method. The PFS-PDMDAAC compound coagulant is prepared as the following steps: the PFS dry powder or solution is arranged in a mixing reactor, and water is added to obtain a ferric-salt PFS solution which is stirred under normal temperature and a PDMDAAC colloid is added into the solution; the mixed solution is stirred under normal temperature till the PDMDAAC colloid is completely dissolved to obtain a stable PFS-PDMDAAC. The application of the PFS-PDMDAAC compound coagulant is to adopt the PFS-PDMDAAC compound coagulant for the coagulation treatment to raw water and waste water and sewage and the dehydration treatment to sludge or silt directly or after dilution with water by any proportion. The component structure and content scope of the invention are distinct to guarantee the capability and stability of the obtained PFS-PDMDAAC compound coagulant, and the materials on industrial manufacturing are available. The various functions of the PFS-PDMDAAC compound coagulant can be adjusted during water treatment with high adaptability so as to reduce cost, reinforce coagulation effect and dramatically enhance the quality of obtained water.

The invention discloses a method for preparing a copolymer of dimethyl diallyl ammonium chloride and acrylamide through initiation of a composite initiator. In the method, powder products of the copolymer of dimethyl diallyl ammonium chloride and acrylamide are prepared by taking high-purity industrial products, i.e., dimethyl diallyl ammonium chloride monomers and acrylamide monomers as raw materials, adding a metallic ion chelating agent and the composite initiator, initiating polymerization to produce colloidal products through heating in three steps, and then drying and crushing. In the invention, the content of various main impurities in the high-purity industrial products, i.e., cationic monomers and nonionic monomer materials, is known, and the upper limit of the content is defined, the process for preparing the products through copolymerizing the monomers has good stability, and the products have high relative molecular mass; the obtained PDA (Poly(DMDAAC-co-AM) products have high seriation degree of cationic degree, and the PDA products have high relative molecular mass under each cationic degree and a broad application range and can be more widely applied to a plurality of fields such as oil exploitation, papermaking, mining, textile printing and dyeing, daily-use chemical industry, water treatment and the like.

The present invention discloses preparation process of polyammonium dimethyldiallyl chloride with relatively high molecular weight. By using ammonium dimethyldiallyl chloride with high purity as material, and through adding initiator and complexing agent at certain temperature and stepped temperature raising for slow releasing of the initiator and stepped initiation of the polymerization, colloidal or powdered polyammonium dimethyldiallyl chloride is prepared. The process has high technological stability, low production cost and easy operation, and the product has relatively high molecular weight and various uses.

The invention provides a polydimethyldiallylammonium chloride modified color fixing agent and a preparation method thereof. The preparation method comprises the following steps: (1) adding a chelating agent and deionized water into a reaction kettle, starting agitating, heating for increasing the temperature; (2) when the temperature is increased to 60-80 DEG C, simultaneously dropwise adding dimethyldiallylammonium chloride, unsaturated ester, epoxy compound and initiator solution with the concentration of 1-10% into first to fourth elevated tanks in sequence, wherein the dripping time is controlled in the range of 0.5 to 2 hours, and the dripping temperature is controlled at 65-85 DEG C; and (3) after the dripping is finished, preserving the temperature for continuously reacting for 1 to 5 hours, adding deionized water according to the requirements of products so as to dilute, and evenly agitating to obtain the color fixing agent.

The invention relates to a preparation method of a polyaluminum ferric chloride-poly dimethyl diallyl ammonium chloride (PAFC-PDMDAAC) inorganic/organic composite flocculant. The inorganic/organic composite flocculant is prepared by taking AlCl3.6H2O, FeCl3.6H2O, and PDMDAAC as raw materials and adopting a method of adding PDMDAAC into a PAFC system. The flocculant integrates the advantages of high molecular weight of PDMDAAC, high charge neutrality and adsorption bridging ability, wide application range, good flocculation effect and small generated sludge quantity, and high PAFC reaction velocity, large formed flocculating constituent, high settling velocity, wide applied pH (potential of hydrogen) range, good coagulation effect and the like. The PAFC-PDMDAAC inorganic/organic composite flocculant can be widely applied to the fields of water supply, waste water treatment, papermaking, oil extraction, textile printing and dyeing, mining, daily-use chemical industry and the like, and has a good water treatment effect.

The invention discloses an efficient defluorination compound chemical and a method for treating fluoride waste water by using the same. The efficient defluorination compound chemical comprises, by weight, 50%-64% of polymeric aluminum, 3%-8% of magnesium chloride, 8%-13% of calcium chloride, 10%-13% of polymeric aluminum ferric chloride and 0.5%-2% of dimethyl diallyl ammonium chloride. By compounding the materials to prepare a liquid chemical and adding the liquid chemical into the fluoride waste water proportionally, complexation, agglomeration and absorption of fluorine ions are completed by mechanical stirring, the purpose of efficient defluorination is realized, and the efficient defluorination compound chemical has the advantages of simplicity in chemical application, high defluorination efficiency, low treating cost, wide application range and the like.

The invention discloses a water solution polymerization production method of dimethyl diallyl ammonium chloride and acrylamide copolymer, which uses cation industrial monomer DMDAAC and industrial non-ionic monomer AM prepared by industrial one-step method as raw materials, uses initiator via water solution polymerization to prepare dimethyl diallyl ammonium chloride and acrylamide copolymer, with high relative molecular weight and cation degree serialization. The invention uses cheap materials, has wide adjustable proportion between oxidant and reducer in initiator, and the application for initializing polymerization temperature of different cation degree PDA products. The invention has simple and mild reaction condition, while the PDA product cation degree is 5-99%, relative characteristic viscosity is 17.0-2.9dL/g, and residual monomer content is lower than 1%. The product has high cation degree serialization, high relative molecular weight of PDA product in each cation degree, strong adaptability, simple method, easy industrialization, and wide application in oil development, paper making, mining, weaving, dying, water treatment, and daily chemical or the like.

This invention relates to a composite clarification agent used in sugar production. The composite clarification agent is composed of: polymerized AlCl3, organic polymeric materials (including chitosan, chitosan quaternary ammonium salt and dimethyl diallyl ammonium chloride), and ultra-fine powder (including perlitic powder, diatomite and clay) at a ratio of (45-90) :( 1-10) :( 5-50). The composite clarification agent has high electrical neutralization and bridge linkage performances, and has such advantages as low cost, rapid solid-liquid separation and no toxicity. The composite clarification agent is suitable for clarifying mixed juice, filtrate and syrupy in sugar production. The method has such advantages as abundant raw materials, simple process and easy operation.

The invention provides a composite anti-mud agent based on a polycarboxylate-type pumping agent, an anti-mud pumping agent and a preparation method of the anti-mud pumping agent. The anti-mud pumping agent comprises a water reducing component which is namely a liquid polycarboxylate superplasticizer with solid content of 40%, a retarder component which is namely a conventional retarder, an entraining component which is namely an anionic surfactant synthesizing entraining agent and a composite anti-mud agent which is namely a mixture of calcium nitrate, polyvinyl alcohol, beta dextrin and diallyl dimethyl ammonium chloride. The preparation method of the anti-mud pumping agent comprises the following steps: firstly adding raw materials of the composite anti-mud agent into water, and preparing a composite anti-mud agent solution; adding the composite anti-mud agent solution into a mixture of the polycarboxylate superplasticizer, the entraining agent, the retarder and water, and uniformly stirring. The anti-mud pumping agent has the advantages that influence of content of mud in sand and stones on flowability of concrete can be obviously reduced without increasing the cost, the time loss in collapsed slump is reduced, and other properties such as strength of the concrete are not influenced.

The invention relates to a fracturing fluid thickening agent and preparation and application thereof. The thickening agent is mainly prepared from the following components in percentage by weight: 15-20% of acrylamide monomer, 6-10% of acrylic monomer, 3-6% of sodium carbonate, 3-8% of 2-acrylamide-2-methylpropanesulsonic acid, 1-4% of dimethyldiallylammonium chloride (60% aqueous solution), 0.03-0.08% of potassium persulfate and the balance of water. The preparation comprises the following steps of: adding the acrylic monomer and water into a reaction kettle; starting stirring and slowly adding sodium carbonate, wherein the adding speed is proper when the bubbles generated by the reaction do not overflow out of the reaction kettle; stirring till sufficient dissolution; adding 2-acrylamide-2-methylpropanesulsonic acid, and stirring till sufficient and uniform mixing; adding the acrylamide monomer and dimethyldiallylammonium chloride, and stirring till sufficient dissolution; heating the reaction liquid to 40 DEG C, introducing nitrogen, and performing thermal insulation stirring for 20 minutes; adding potassium persulfate; continuously introducing nitrogen, and stirring for 30 minutes; stopping the stirring, and reacting for 4 hours to obtain gel; and grinding the reaction product, drying and granulating to obtain the thickening agent.

A bond is created during gypsum board cure between a gypsum matrix and a tacky coating applied onto a glass fiber. The tacky coating is comprised of a polymer composed of methacrylic acid and dimethyldiallyammonium chloride. The polymer is dissolved in an acidic aqueous solution and is roller coated onto the glass fibers. The chopped glass fibers may also be placed in such an acidic solution, which is made alkaline by the addition of alkali, thereby precipitating the polymer out of solution as a tacky composition that produces a tacky coating on the glass fibers. The glass fibers with the tacky bond coating are incorporated in an alkaline gypsum slurry to form a gypsum board having a first and second facer sheet. The tacky coating on the glass fibers bonded to the gypsum matrix result in compliant load transfer between the gypsum matrix and the glass fibers, yielding improved flexure strength and nail pullout resistance.

The invention discloses a preparation method of hydrophobic modified cation polyacrylamide flocculating agent including following steps: acrylamide, dimethyl diallyl ammonium chloride, butyl acrylate and surface-active agent are mixed after being weighed. Polymerized monomer water solution is obtained after the above mixture is stirred to be uniform with the addition of deionized water. All kinds of additives are then added in the polymerized monomer water solution; a compound initiator and then a photoinitiator are added for polymerization; after the polymerization reaction, colloidal particles are extracted for granulation, drying, crushing and sieving. The hydrophobic modified cation polyacrylamide is then obtained in the end. The flocculating agent prepared in the invention can improve the adsorption capacity of polymers to suspended particles especially organics in water through the introduction of hydrophobic groups into flocculating agent macromolecules. At the same time, the flocculating agent has a character of the hydrophobic association of high polymers which is in favor of the interaction between macromolecules, the reduction of the hydrophilic nature of flocs, the acceleration of the settling velocity of flocs and the improvement of the floccules intensity and the water separation capability of filter cakes.

The invention relates to a novel formaldehyde-free fixing agent which is prepared from diethylenetriamine (AE), epichlorohydrin (EP), and dimethyl diallyl ammonium chloride (DMDAAC) with a monomer molar ratio of 2 : 2 : 1. Water is used as a solvent and the obtained product contains 10 % of solid. The prepared fixing agent does not produce formaldehyde substance during production and usage, and the dyed fabric with the dye-fixation treatment does not release formaldehyde either, thereby being capable of effectively improving wet rubbing fastness of cotton fabric dyed with reactive dyes, and obtaining high-quality dye-fixation effect.