3results about How to "Increase active point" patented technology

The invention provides a springback-reducing admixture for sprayed concrete and a preparation method of the springback-reducing admixture, and relates to the technical field of concrete admixtures. The springback-reducing admixture for the sprayed concrete comprises the following raw materials in percentage by mass: 40-70% of a component A and 30-60% of a component B, the component A comprises the following raw materials in percentage by mass: 30%-50% of calcined kaolin, 10%-20% of light calcined magnesia and 40%-60% of semi-hydrated gypsum. And the component B comprises the following raw materials in percentage by mass: 60-90% of cement, 5-10% of modified rubber powder and 5-10% of cellulose. The springback-reducing admixture for sprayed concrete provided by the invention is applied to sprayed concrete and has relatively low springback rate and relatively high strength.

The invention specifically discloses a flexible high-permeability epoxy waterproof anticorrosive coating and a preparation method thereof. The coating comprises a component A and a component B, wherein the component A is prepared from the following raw materials in percentage by mass: 31 to 35 percent of furfural, 13 to 17 percent of acetone, 0.02 to 0.07 percent of sodium hydroxide, 1 to 3 percent of butyronitrile carboxylic toughening modified epoxy prepolymer, 43 to 47 percent of epoxy resin, 1 to 5 percent of C12 to tetradecyl glycidyl ether, 1.5 to 2.0 percent of benzyl alcohol, 0.05 to 0.15 percent of coupling agent, 0.01 to 0.05 percent of wetting agent and 0.01 to 0.04 percent of defoaming agent; and the component B is prepared from the following raw materials in percentage by mass: 23-27% of diethylenetriamine, 58-62% of an epoxy curing agent, 4-6% of a tertiary amine curing agent and 9-11% of benzyl alcohol. The coating disclosed by the invention has relatively good strength, crack resistance and tensile strength, and a film formed by the coating is not easy to crack after being irradiated by sunlight ultraviolet rays.

The application discloses a supported metal element synergistically modified copper-based catalyst and a preparation method and application thereof. The catalyst is composed of metal copper, metal gallium, an auxiliary element M and a carrier SiO2. In the preparation method, a Cu-Ga catalyst precursor is prepared through an ammonia evaporation method, and then the auxiliary element is added through ball milling. Mechanical shearing force and impact generated in the milling process can promote sufficient contact and uniform mixing of the auxiliary element and the precursor, so that the auxiliary element is more uniformly distributed and a strong interaction is formed. Under the condition that the hydrogen ester ratio is about 200, the application can still maintain a high methyl 3-hydroxypropionate conversion rate and 1,3-propanediol selectivity.