34results about How to "Increase hydrophilic group" patented technology

The invention discloses a preparation method of polylactic-acid-gel-toughened sponge, which comprises the steps of polyurethane sponge pretreatment, preparation of a polylactic acid finishing solution, finishing, cleaning and drying, and the like. The polyurethane sponge piece is subjected to pretreatment and plasma treatment to destroy the microscopic surface of the polyurethane sponge network, and carboxyl and other oxygen-containing active groups are grafted on the surface; the groups react with the amino group on the ethylenediamine-modified polylactic acid macromolecule surface to implement crosslinking; drying is carried out to obtain a polylactic acid film on the polyurethane sponge sheet network structure surface; and the film is beneficial to increasing the rebound rate of the pressed polyurethane sponge. Compared with the untreated polyurethane sponge, the quantity of the hydrophilic groups on the sponge network surface is increased, and the hydrophilicity of the sponge is enhanced. The sponge prepared by the method has certain antibacterial property and flame retardancy.

A viscosity-reducing high-efficiency water-reducing polycarboxylate water-reducer and its preparation method, the water-reducer is composed of macromonomers such as isopentenol polyoxyethylene ether monomers, unsaturated hydroxy acid monomers or derivatives thereof, Or the unsaturated acid with trans structure is prepared by free radical polymerization under the action of reducing agent, oxidizing agent and chain transfer agent by intermittent dropping. The anchor groups and side chains in the water reducer of the present invention are block-distributed molecular structures, which can give full play to the electrostatic repulsion and steric hindrance effects; in addition, the hydroxyl groups introduced by unsaturated hydroxyacid monomers or their derivative monomers Polar groups such as carboxyl and carboxyl groups increase the proportion of hydrophilic groups and reduce the surface tension of the cement pore solution; in addition, the trans structure represented by fumaric acid and dihydroxy fumaric acid derivatives, due to its special The structure, that is, the rigidity of the monomer itself and its two carboxyl groups are distributed on the opposite side of the side chain, which makes it easy to show a stretched structure in space, reduces the possibility of molecular chain entanglement, and significantly increases the polycarboxylate superplasticizer. Adsorption on the surface of cement, thereby improving the viscosity-reducing effect of polycarboxylate superplasticizer.

The invention discloses a PET / PBT blended modified fiber, comprising the following parts by weight: PBT: 30-50 parts PET: 80-120 parts, 4-methyl-2-(2-methyl-1-propylene base) tetrahydropyran: 0.1~0.5 parts, nucleation accelerator: 0.5~1 part, hydrophilic modifier: 0.5~1 part, and the hydrophilic modifier is: N-(3-triethoxy a mixture of (silylpropyl)-4-hydroxybutyramide and 1-methoxy-2-(epoxymethoxy)benzene. Using PBT and PET as the main body, blending is carried out to prepare blended materials. By adding hydrophilic modifiers, the hydrophilic groups on the surface of the blended materials are increased, so that in the dyeing process using water-based dyes, the water-based dyes can be improved. color fastness.

The invention belongs to the field of biomedicine, and specifically relates to a composite hydrogel for promoting wound healing and its preparation method and application. The composite hydrogel is composed of gelatin, antibacterial photodynamic peptide and recombinant human type III collagen. Photodynamic antibacterial chemotherapy is carried out by introducing photosensitizer Ce6 to antibacterial, and it is used to generate active oxygen under laser irradiation, which leads to the oxidation of microbial molecules and causes bacterial cell damage and death, and produces synergistic effects with antimicrobial peptides. The antibacterial composite hydrogel has good biocompatibility and maintains a moist environment around the wound. It can stably transport the loaded antibacterial photodynamic peptide and recombinant human collagen to the wound surface, and guide the formation of Fibroblasts migrate and proliferate, increasing the deposition of new collagen in vascular reconstruction, thereby accelerating wound healing and improving the quality of wound healing.

The invention discloses a method for efficient co-production of cyclodextrin and rice protein through rice processing by-products. Broken rice and rice bran serve as raw materials. The method includes the steps that firstly, mechanical activation is conducted; secondly, ultrasonic waves are united with low-concentration cellulase for treatment; thirdly, separation is conducted, wherein broken rice and rice bran slurry obtained in the second step is subjected to centrifuging at the rate of 2500 r / min to 3200 r / min, and supernate and sediment are obtained; fourthly, broken rice and rice bran protein is extracted; fifthly, the broken rice and rice bran cyclodextrin is extracted, wherein the fifth step includes the sub-steps that A, debranching treatment is conducted; B, 4-alpha-glycosyl transferase and glucoamylase are modified; C, compound enzyme of the modified 4-alpha-glycosyl transferase and the modified glucoamylase is treated; and fourthly, a finished cyclodextrin product is obtained after freezing drying. According to the method, the high-quality broken rice and rice bran glucoamylase and high-quality rice protein by-products can be prepared, and the use value of the rice processing by-products is further improved.