47results about How to "Stable cross-linked structure" patented technology

The invention provides a preparation method of shape memory polyurethane, and relates to the technical field of preparation of polyurethane materials. The method comprises the following steps: carrying out a reaction on 1,3,5,7-tetrahydroxyadamantane, epsilon-caprolactone, a catalyst and a solvent in an inert gas at 70-130 DEG C for 20-50 h to obtain adamantyl star-shaped poly(epsilon-caprolactone), wherein a molar ratio of the 1,3,5,7-tetrahydroxyadamantane to the epsilon-caprolactone is 1:(40-240); uniformly mixing the adamantyl star-shaped poly(epsilon-caprolactone) with long-chain diol and isocyanate, adding a catalyst and the solvent, and carrying out a reaction at 50-100 DEG C for 3-9 h to obtain an isocyanate-terminated polyurethane prepolymer, wherein a mass ratio of the adamantyl star-shaped poly(epsilon-caprolactone) to the long-chain diol is 9:1 to 1:9; and adding a linking agent to the polyurethane prepolymer to react the linking agent with the isocyanate in the polyurethane prepolymer in order to obtain the adamantane crosslinked shape memory polyurethane. The shape memory polyurethane prepared through the method has the advantages of very good shape memory effect and range enlargement.

The invention relates to a foundation reinforcement method, comprising the following steps: (1) Drilling a foundation hole, inserting the lower end of a flower tube with several holes evenly distributed on the pipe wall into the foundation hole, filling the lower part of the foundation hole with coarse sand and then compacting it; (2) ) Inject water glass solution and cement slurry into the bottom of the flower tube through the first inner sleeve, and wait for the bottom of the flower tube to solidify in the foundation hole; (3) Ream the upper part of the foundation hole to form an enlarged hole, and then inject The grout discs are set equidistantly and sequentially on the part of the flower tube located in the enlarged hole; (4) Fill the enlarged hole with coarse sand; (5) Pump the high-pressure water glass solution into each grouting disc sequentially through the second inner casing , the water glass solution scours and diffuses outward through the grouting pipe, and then pulls out the second inner sleeve; (6) Inject cement slurry into the floral tube, part of the cement slurry diffuses outward through the grouting pipe to contact the water glass solution, and the other part Directly enter the coarse sand in the enlarged hole through the hole on the flower tube, and the work is completed after the cement slurry solidifies.

The process of hybridizing n-propanol to prepare weak excitant photochromic WO3 powder includes the following steps: 1. preparing tungstate solution; 2. regulating pH of the reactant solution to 0.8-2.0; 3. adding n-propanol to the solution and homogenizing the reactant system through stirring for 2-6 hr; 4. setting the reaction system in a hydrothermal kettle for hydrothermal reaction to obtain WO3 portions; 5. washing the powder; and 6. vacuum drying in a vacuum drying oven to obtain the weak excitant photochromic WO3 powder. The hybridized powder has raised photochromic reaction activity, fast bluing under the excitation of sunlight or low power ultraviolet ray, fast discoloring in no light condition and relaxed requirement on the light source for color change.