52results about How to "Guaranteed Affinity" patented technology

Belonging to the technical field of pervaporation membrane separation, the invention relates to a preparation method of a modified polyurethane pervaporation phenol / water separation membrane. The preparation method of the membrane consists of: reacting hydroxyl-terminated polybutadiene with diisocyanate to obtain a terminated prepolymer, adding diamine and cyclodextrin as a chain extender for chain extension, and taking N, N-dimethyl acetamide as a solvent to obtain a modified polyurethane solution, carrying out membrane casting on the solution on a polyfluortetraethylene plate, and conducting curing at room temperature for 1 to 1.5 hours, then moving the obtained membrane into an oven at a temperature of 80DEG C for 10-15 hours of heat treatment, thus obtaining the modified polyurethane membrane. The material synthesis and membrane preparation process of the invention is simple, and the prepared membrane has good thermal and chemical stability as well as mechanical properties. Moreover, compared with traditional unmodified polyurethane separation membranes, the membrane prepared in the invention, due to the existence of the modifier cyclodextrin, has a better comprehensive separation effect on phenol in a phenol / water mixed solution, and has a great practical value.

The present invention relates to a preparation method of a medical adhesive with high antibacterial performance, which is characterized in that it comprises the following steps: step 1, adding sodium alginate, lignin, tannic acid, and a stabilizer Bacterial water, heated to 100°C, stirred and dissolved for 150min, cooled to room temperature to obtain aqueous solution A; step 2, poly(α-isobutyl cyanoacrylate-α-octyl cyanoacrylate), polyurethane, polyisoprene According to the ratio of parts, add alkenes to seabuckthorn seed oil, heat to 80°C and stir for 75min, cool to room temperature to obtain seabuckthorn seed oil solution B; step 3, mix the above aqueous solution A and seabuckthorn seed oil solution B evenly, and Add high-efficiency antibacterial components and formaldehyde inhibitors, and stir for 4 hours; Step 4, filter and sterilize the product obtained in Step 3, subpackage, seal, and package to obtain a medical adhesive with high antibacterial performance.

The invention discloses a method for combining large-diameter tree / tree house with multiple small trees and provides a method for combining small tree seedlings with a ground diameter of phi (1cm-3cm) into one tree and growing into a tree with a huge diameter in 5-10 years. Moreover, another function of the tree is that the tree is a new variety not existing in the nature. The method for combining large-diameter tree / tree house with multiple small trees comprises the technical procedure as follows: small tree seedlings with a ground diameter of phi (around 1cm-3cm) and a height of 1.5-3m are selected; then a pit is dug and a plurality of small tree seedlings are together placed in the pit; then two planes of two rind parts of 60mm sections of the trunks of two small tree seedlings in the most center which can be contacted are selected and flatly jointed; then 2-4 small holes are drilled in two contact points; crabsticks with a ground diameter of phi (1mm) are inserted into the holes; then the residual crabsticks are removed so that the crabsticks are aligned to an outer wall; then the crabsticks are fixed by thin ropes; 502 or white latex glue is coated between the crabsticks and the hole walls so that the crabsticks and the hole walls are firmly stuck; after fixation, the rope is unfastened; and so forth, a neighboring tree is placed closely and connected by crabsticks; afterthe connection is completed, the trees are bound by a soft rope; then the soft rope is removed in a half year so that the trees can grow naturally; after the trees grow higher, the height positions are connected by adopting the same method. The trunks are outwards bent at a required height and are fixed by bending plates with a bending angle of 120-150 degrees (as shown in diagram 3); then the bending plates are removed in a half year; and the trees are conventionally and carefully cultured; the crown is pruned; and the trees grow into a tree with a huge diameter in a plurality of years.