39results about How to "Low acid and alkali resistance" patented technology

The invention discloses a monovinyl-terminated fluorine-containing prepolymer / epoxy (methyl) acrylate composite UV-cured paint, preparation and applications thereof, and belongs to the field of polymer materials. The composite UV-cured paint comprises the following components in parts by weight: 0.01 to 50 parts of monovinyl terminated fluorine-containing prepolymer, 100 parts of epoxy (methyl) acrylate resin, 2 to 20 parts of active diluting monomers, 0.5 to 8 parts of photoinitiator, 0.5 to 5 parts of dispersant, and 0.1 to 4 parts of antifoaming agent. In the composite UV-cured paint, the monovinyl-terminated fluorine-containing prepolymer and epoxy (methyl) acrylate are taken as the main resins, and at the same time, active diluting monomers, dispersant, and antifoaming agent are added to prepare the paint, which has the advantages of low surface energy, alkali / acid resistant property, and good transparency and can be applied to the fields such as electronic encapsulation, construction paint, metal paint, and the like.

The invention discloses a production method of a composite fiber cement board, and belongs to the technical field of building materials. The production method comprises the following steps: mixing microcrystalline cellulose with a sodium hydroxide solution, cooling the obtained solution, adding a precooled urea solution, stirring and mixing the obtained solution, centrifuging the obtained solutionto obtain a microcrystalline cellulose solution, dropwise adding an etherifying agent to the microcrystalline cellulose solution, performing constant-temperature stirring and reacting, cooling the obtained solution, adding urease and a calcium nitrate solution, continuing a reaction, concentrating the obtained reaction solution, drying the concentrated reaction solution to obtain etherified microcrystalline cellulose, performing a constant-temperature and constant-pressure reaction on the etherified microcrystalline cellulose and a sodium methoxide solution, cooling the obtained reaction solution, adding chloromethane, performing a constant-temperature and constant-pressure reaction, carrying out reduced pressure concentrating, drying the obtained concentrate to obtain modified microcrystalline cellulose, mixing cement, the modified microcrystalline cellulose, a water reducer and a defoamer, carrying out injection molding, and curing the molded mixture to obtain the composite fiber cement board. The composite fiber cement board obtained in the invention has excellent mechanical properties.

The invention relates to a method for preparing a hydrophobic-lipophilic self-supporting polymer porous membrane and a composite hydrophobic-lipophilic separation material. The emulsion obtained after stabilizing high-speed stirring is stabilized by adding a stabilizer to the polymer solution, and is prepared by volatilization of a solvent. Hydrophobic-oleophilic self-supporting membrane polymer porous membrane. The composite hydrophobic-lipophilic separation material can be obtained by casting the emulsion onto different substrates. The micron-scale pore structure in the film increases the roughness of the surface, and the nano-scale and / or micron or sub-micron-scale pores make the film hydrophobic, thereby enabling efficient separation of emulsified oil and water. The invention solves the problems of poor thermal stability, acid and alkali resistance, poor anti-pollution ability and poor mechanical strength of ordinary polymer separation membranes, has high separation efficiency and flux, and its preparation process is simple and easy to operate, and can be applied It is used to prepare a large-area separation membrane with controllable thickness, uniform flatness and high mechanical strength.