7 results about "Polydimethyl diallylammonium chloride" patented technology

The application provides a modified activated carbon for removing perchlorate in water for sheep farms and a preparation method thereof, relates to the field of water treatment, and the method carries out reaction on activated carbon in a citric acid aqueous solution, uniformly loads a carboxyl layer on the surface of the activated carbon, and obtains preliminarily modified activated carbon; carries out reaction on the preliminarily modified activated carbon in an alkaline polydimethyl diallyl ammonium chloride aqueous solution, and strong cation quaternary ammonium salt is adsorbed on the surface of the carboxyl layer through electrostatic action, thereby obtaining secondarily modified activated carbon; and carries out reaction on the secondarily modified activated carbon in a triethylenetetramine aqueous solution, so that triethylenetetramine molecules are further combined to the strong cation quaternary ammonium salt through electrostatic adsorption, thereby obtaining the modified activated carbon for removing perchlorate in water for sheep farms, the adsorption capacity of the activated carbon for solutes with negative charges is significantly enhanced, and the treatment efficiency of the overall farm environment on perchlorate is improved.

This invention discloses a red pigment paste for color photoresist and its preparation method, relating to the field of photoresist technology. The red pigment paste for photoresist comprises the following materials: modified pigment red 177, propylene glycol methyl ether acetate, poly(methacrylic acid-co-acrylate) copolymer, acrylate resin, styrene-maleic anhydride copolymer, and antioxidant. This invention, by adding modified pigment red 177, works synergistically with the poly(methacrylic acid-co-acrylate) copolymer and polydimethyldiallyl ammonium chloride to inhibit pigment particle agglomeration, ensuring uniform dispersion of the pigment in the propylene glycol methyl ether acetate solvent, thus guaranteeing uniform and fine dispersion of the pigment paste. The antioxidant in this invention includes β-cyclodextrin, which can coat pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and UV-327, improving the compatibility of the pigment paste system and extending the storage life of the pigment paste.

The invention discloses a treating agent and a treating method for waste water-based drilling fluid, and belongs to the technical field of oil field waste drilling fluid treatment. Wherein the treating agent is composed of a gel breaker and a flocculating agent; the gel breaker is prepared from the following raw materials: 25wt%-30wt% of polyaluminum chloride, 0.1 wt%-0.2 wt% of cationic polyacrylamide and the balance of water. The flocculant is prepared from the following raw materials in percentage by weight: 1wt%-3wt% of poly dimethyl diallyl ammonium chloride, 0.5 wt% of a heavy metal stabilizer and the balance of water. According to the method, the waste drilling fluid can be quickly treated, the production requirements of an offshore drilling platform or a limited space can be met, meanwhile, the requirements of safety, environmental protection, water compatibility and the like are met, the problems of space occupation and cost caused by long-term storage and transportation of the waste drilling fluid are solved, and a method and a way are provided for green and quick offshore drilling. The method is suitable for treating the waste water-based drilling fluid in an offshore platform or other limited spaces.

This invention discloses a composite cationic flocculant based on a dual gradient of molecular weight and charge density, along with its preparation and application methods. The flocculant is composed of a medium-molecular-weight, high-charge-density poly(diallylammonium chloride)-acrylamide copolymer (PDA) and a high-molecular-weight, medium-low-charge-density cationic polyacrylamide (CPAM), with an effective mass ratio of 10:1 to 20:1. The mass charge density of PDA is 2 to 3 times that of CPAM. A gradient shear mixing preparation process and a time-sequential synergistic flocculation application method based on differences in diffusion kinetics are employed. Through a relay effect of rapid charge neutralization (0-30 seconds) and slow bridging (30-180 seconds), the flocculant can form a skeleton-filled floc structure, achieving adaptive interception of dissolved organic matter and complexation-encapsulation and fixation of heavy metals. This invention can significantly shorten plate and frame filter press time and reduce the moisture content of the filter cake and the concentration of pollutants in the effluent.

The application discloses an environment-friendly agent for sewage treatment and a preparation method thereof, and belongs to the technical field of water treatment. The environment-friendly agent for sewage treatment comprises the following raw materials in parts by weight: modified cellulose 15-20 parts, layered double hydroxide 10-15 parts, diatomite 25-30 parts, 2-mercaptobenzothiazole 1-3 parts, polyaluminum chloride 20-25 parts, polydimethyl diallyl ammonium chloride 5-8 parts, and ferrous sulfate 5-8 parts, wherein the modified cellulose is subjected to double modification of quaternization and amino grafting. The environment-friendly agent for sewage treatment is innovatively compounded by the modified cellulose, the layered double hydroxide and the 2-mercaptobenzothiazole, takes diatomite as a carrier, and cooperates with other substances, so that the suspended solids in water are quickly reduced, and the COD, total phosphorus and heavy metal ions are also remarkably removed, and the sewage treatment efficiency is remarkably improved. The environment-friendly agent for sewage treatment realizes the efficient and comprehensive sewage treatment purpose, is environment-friendly, and has remarkable application value.

This application relates to the field of headliner materials for new energy vehicles, and discloses a lightweight moisture-proof headliner material for new energy vehicles and its preparation process. The lightweight moisture-proof headliner material for new energy vehicles is prepared by impregnating needle-punched nonwoven fabric with a water-based nitrile rubber solution and curing it. The water-based nitrile rubber solution is prepared from the following raw materials in parts by weight: 100-120 parts water-based carboxylated nitrile rubber, 18-25 parts nanocrystalline cellulose suspension, 4.5-6.5 parts dispersant, 1-3 parts crosslinking agent, 1-3 parts antioxidant, 0.2-0.5 parts defoamer, 0.2-0.5 parts colorant, and 40-60 parts water. The nanocrystalline cellulose suspension is composed of nanocrystalline cellulose, organomontmorillonite, polydimethyldiallyl ammonium chloride, 4-vinylbenzyltrimethylammonium chloride, a silane coupling agent, and an aqueous ethanol solution. The headliner material of this application will not expand, deform, warp, or discolor under long-term humid and hot conditions, and has good moisture resistance.

This invention provides a high-strength, low-cost immobilized D-allulose 3-epimerase, its preparation method, and its application. The immobilized enzyme is obtained by the following method: (1) Fermentation broth expressing D-allulose 3-epimerase is obtained through fermentation, and the cell concentration of the fermentation broth is adjusted to obtain the immobilized enzyme raw material; (2) Chitosan-modified diatomaceous earth and polydimethyldiallylammonium chloride-modified bentonite are added sequentially to the immobilized enzyme raw material and stirred evenly at room temperature; (3) Then, flocculant and crosslinking agent are added and stirred at room temperature for 1.5-4 hours; (4) Filter cake is prepared, granulated, and dried to obtain the immobilized enzyme. The immobilized enzyme can withstand high-pressure column reactors like resins, but its preparation cost is much lower than that of resins. The immobilized enzyme is loaded into a column reactor to form a reaction column, which can achieve continuous conversion of fructose to D-allulose for more than 200 days, and has important application value.