36results about How to "Make up for performance deficiencies" patented technology

The invention discloses a preparation method of a comb-like structure organosilicon-polyurethane copolymer, which is to prefabricate single-end polyhydroxyl-terminated phenyl-modified polysiloxane and amino-terminated polysiloxane, and then use polyisocyanate React with polyols and the above two modified polysiloxanes successively, and then undergo chain extension to obtain a comb-shaped structure silicone-polyurethane copolymer. The polymer prepared by the present invention has the advantages of both polyurethane and polysiloxane. On the one hand, it has good mechanical and physical properties such as cohesiveness, adhesion, wear resistance, and extensibility, so that the overall material can be well applied to various Surface and interface occasions; on the other hand, it strengthens the thermal stability and weather resistance of the polymer as a whole, expands the application range of the product, and makes it have excellent application prospects in the fields of mold release agents, coatings, and sealants.

The invention belongs to the field of composite materials, and concretely relates to a nano-hydroxyapatite / carboxymethyl chitosan / poly(lactic-co-glycolic acid) micro-nano hybrid drug-loaded scaffold and a bionic preparation method thereof. The three-dimensional bionic hybrid drug-loaded scaffold is prepared through combining solvent evaporation and freeze drying technologies by using a high speed emulsifying machine via adopting nano-hydroxyapatite and carboxymethyl chitosan as a water phase and an emulsion continuous phase, adopting a methylene chloride solution of poly(lactic-co-glycolic acid) as an oil phase and an emulsion dispersion phase, using glutaraldehyde as a cross-linking agent to immobilize the carboxymethyl chitosan in the continuous phase and adopting the main component icariin in a traditional Chinese medicine epimeddium as a carrier drug. The preparation method has the advantages of simple preparation process and mild reaction conditions, and the obtained scaffold overcomes the performance defects of single natural polymer materials or synthetic polymer materials, has the advantages of intercommunicated pores, uniform pore diameter, figurability, slow drug release, good bone bonding ability and good biocompatibility, and is expected to become a new osteoporosis treatment composite material.

The invention discloses a preparation method of cerium and praseodymium stabilized zirconia polishing powder. The preparation method comprises the following steps: mixing zirconium carbonate, cerium carbonate, praseodymium carbonate and a hydrochloric acid solution to obtain a mixed solution; adding an alkaline solution into the mixed solution in a stirring state, and carrying out a precipitation reaction to obtain alkaline zirconium carbonate cerium and praseodymium coprecipitation; and carrying out first roasting, smashing and second roasting in sequence on the alkaline zirconium carbonate cerium and praseodymium coprecipitation so as to obtain the cerium and praseodymium stabilized zirconia polishing powder. The two elements of cerium and praseodymium are doped into the zirconia polishing powder, and the polishing powder obtained through first roasting, smashing and second roasting has relatively high removing rate and relatively low micro scratch level, so that the polishing performance of the polishing powder is improved, and the requirements for high-precision and large-diameter optical glass lenses in the market are met.