7 results about "Macromolecular architecture" patented technology

This invention discloses a method and system for converting waste plastics into hydrogen based on microwave pretreatment and solar photocatalytic reforming, belonging to the field of solid waste resource utilization and clean energy technology. The method includes: mixing waste plastics with water for microwave pretreatment to destroy their macromolecular structure and generate a liquid-phase product rich in small-molecule organic matter; performing solid-liquid separation on the liquid-phase product; and conveying the separated liquid to a flat-plate photocatalytic reactor for photocatalytic reforming under sunlight irradiation and the action of a catalyst supported on a 3D-printed substrate to produce hydrogen and high-value chemicals. The system includes a microwave pretreatment unit, a filtration unit, and a flat-plate photocatalytic reaction unit connected in sequence. This invention achieves efficient, low-carbon, and high-value conversion of waste plastics through the synergy of microwave pretreatment and solar photocatalytic reforming, effectively overcoming the problems of high energy consumption, poor product selectivity, and low photocatalytic efficiency in existing technologies.

The application discloses a preparation method of organic garbage carbon source by composite enzyme combined with nitrogen precipitation. Firstly, enzyme pretreatment is performed on organic garbage materials, starch enzyme, cellulase and hemicellulase are used in cooperation to make macromolecular structure of organic matter be broken, so that preliminary release and partial dissolution of carbon source substances are realized; subsequently, sodium tetraphenylborate is added in the pretreatment system to selectively precipitate nitrogen substances in the solution, and centrifugal separation is performed to reduce nitrogen content of the system; on the basis, potassium persulfate and iron substances are added into the obtained suspension liquid to build a Fenton-like reaction system, residual organic macromolecules are further oxidized and degraded, and the structure is optimized, so that availability and stability of the carbon source are improved. In the whole process, each link cooperates, so that the organic garbage can be efficiently converted into high-quality carbon source with high C / N ratio and COD value, and can be used in a sewage treatment system as stable external carbon source.

The application discloses polyacrylonitrile primary fiber, polyacrylonitrile fiber and a preparation method and application thereof, and belongs to the technical field of high polymer materials and fiber manufacturing. A part of cyano groups on a molecular chain is converted into carboxylic acid salt by performing a partial hydrolysis reaction on polyacrylonitrile in a mixed system of an organic solvent and an inorganic alkali aqueous solution through ultrasonic assistance; the hydrolysis product is dissolved to prepare a spinning solution, and after jetting, in-situ acidification and coagulation and stretching in a coagulation bath containing a protonic acid, a polyacrylonitrile primary fiber containing a carboxyl group is obtained. After washing and stretching, the primary fiber is crosslinked and heat-drawn under high-temperature and negative-pressure conditions, so that the carboxyl groups between the molecular chains are dehydrated to form anhydride bonds, a three-dimensional network macromolecular structure is constructed, and a high-strength polyacrylonitrile fiber is obtained through relaxation and heat setting. The polyacrylonitrile fiber has a breaking strength greater than 9.0 cN / dtex, has the advantages of high strength, stable structure and strong controllability of process, and can be suitable for industrialized production of high-strength polyacrylonitrile fiber.

The present application belongs to the technical field of one-component moisture-cured polyurethane sealant, and relates to a weather-resistant polyurethane plasticizer, a polyurethane bonding sealant for rail transit window glass, and a preparation method and application thereof.A weather-resistant polyurethane plasticizer is obtained by carrying out a first-step polymerization reaction of a diisocyanate compound and a polyether diol, and then adding an excess of 1,2,2,6,6-pentamethylpiperidinol to carry out a second-step polymerization reaction to completely cap the isocyanate groups.The polyurethane bonding sealant for rail transit window glass prepared by using the weather-resistant polyurethane plasticizer can continuously remove harmful free radicals generated by material aging, block photo-oxygen aging chain reactions, and thus improve weather resistance.In addition, the weather-resistant plasticizer has a macromolecular structure, is difficult to migrate, has excellent environmental protection, and can remain stable in a long-term fatigue vibration environment, and is not prone to problems such as mechanical property attenuation, hardness increase, or elongation rate decrease.

This invention discloses a method for preparing and applying anionic waterborne polyaspartic acid ester resin. The preparation method is as follows: (1) reacting an aliphatic polyamine with dialkyl maleate to obtain polyaspartic acid ester; (2) performing an ester exchange reaction between the obtained polyaspartic acid ester and hydroxyalkyl sulfonate to obtain the anionic waterborne polyaspartic acid ester resin. This invention uses hydroxysulfonate to modify polyaspartic acid ester to obtain anionic waterborne polyaspartic acid ester resin with a dendritic macromolecular structure in which anionic sulfonic acid groups extend outward. It can achieve self-emulsification by using water as a solvent, and has better emulsification properties when combined with sulfonate-modified isocyanate curing agents. When applied to coatings, it can produce waterborne PAE polyurea coatings with high strength, high adhesion, and good wear resistance and corrosion resistance.

This invention relates to the field of drilling composition technology, specifically to a Mannich base quaternary ammonium salt corrosion inhibitor. The Mannich base quaternary ammonium salt corrosion inhibitor of this invention comprises a bis-Mannich base quaternary ammonium salt, which has the structural formula of Formula I, wherein R is a C8-16 straight-chain alkyl group and X is a halogen. The unique linking group in the bis-Mannich base quaternary ammonium salt structure allows two pyridine rings to be simultaneously adsorbed onto the metal surface. The uniformly distributed nitrogen and oxygen atoms ensure strong adsorption of the corrosion inhibitor. Simultaneously, the directional arrangement of the long-chain alkyl groups attached after quaternization of the nitrogen atoms forms a hydrophobic protective layer. The uniformly distributed nitrogen and oxygen atoms, and the long-chain alkyl groups attached after quaternization of the nitrogen atoms, fill the voids in the protective film formed between the pyridine rings. This achieves improved corrosion inhibition effect of the macromolecular structure of the Mannich base quaternary ammonium salt corrosion inhibitor while maintaining its non-toxicity.