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 invention discloses a method for preparing a cross-linked nano-medicine based on an active-response one-step method, which specifically includes the following steps: after adding a polymer and a drug with a sulfhydryl group into a solution and mixing them, dialyzing to obtain a cross-linked nano-medicine; the polymer The side chain contains a dithiolane structure. The present invention can obtain nano-medicines with stable circulation through simple preparation, which solves the defects of complex preparation of chemically bonded nano-medicines and the need for catalysts in the prior art; moreover, the products prepared by the present invention have a stable cross-linked structure, avoiding the existing chemical bond The problem of non-crosslinking of composite nanodrugs; on the B16F10 melanoma-bearing model, it showed good therapeutic effect, and the tumor inhibition rate exceeded 90%, indicating that the active targeting crosslinking nanodrug has great potential application in cancer chemotherapy .

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.

The invention discloses a high-strength polymer grouting curing agent and a preparation process thereof. The high-strength polymer grouting curing agent comprises the following raw materials in parts by weight: 20-30 parts of a first component, 23-25 parts of a second component, 30-40 parts of formaldehyde, 30-50 parts of melamine, 50-60 parts of deionized water and 0.1-0.3 part of span 20. The preparation process comprises the following steps: 1, preparing the first component and the second component; 2, uniformly mixing formaldehyde, melamine and deionized water to obtain a mixed solution, adjusting the pH value of the mixed solution, setting the temperature at 70-80 DEG C, and stirring for 50-60 minutes to obtain a prepolymer solution for later use; and 3, stirring the first component, the second component and Span 20 at room temperature for 5-10 minutes, adding the prepolymer solution prepared in the step 2, setting the temperature to be 60 DEG C, adjusting the pH value of the reaction solution, stirring for 2 hours, and adjusting the pH value of the system after stirring to obtain the high-strength high-molecular grouting curing agent.

The invention provides a bisphenol A synthetic resin catalyst and a preparation method thereof. According to the method, the crosslinking degree being 2 to 8 percent is used; third monomers with unsaturated double bonds are introduced to participate in copolymerization; mesoporous white balls with the pore diameter being 1 to 20 nm are obtained and are used as parent matrixes; then, a mild sulfonation process is used for sulfonation; finally, the resin is modified; and a high-intensity strong acid and mesoporous cation resin catalyst with the pore diameter being 2 to 10nm can be obtained. The pressure difference of the materials on the catalyst can be reduced by mesopores formed in the catalyst; the mesopores are favorable for the generation of bisphenol A; byproducts are few; the third monomers of diallyl bisphenol A are added into the catalyst in polymerization, the inside crosslinking structure of the resin is more stable; the pressure-resistant intensity is improved; the affinity of the resin on phenol is improved; the swelling property of materials of the phenol, acetone and the like on the resin is reduced; the damage of the materials to the resin is reduced. The catalyst provided by the invention has the advantages that through the addition of modifying agents, the effects of a cocatalyst are achieved; and the phenol and acetone conversion rate of the reaction raw materials is improved and is high.

The invention discloses a high-intensity photoreversible adhesive, a preparation method and an application. The present invention firstly epoxidizes anthracenyl-containing compound raw materials to prepare anthracene-containing epoxidized products, then mixes them with terminal mercapto alcohol compounds and accelerators, and performs ring opening at room temperature to prepare anthracenyl-containing side chains. Double terminal hydroxyl compound. A double-terminal isocyanate compound and double-terminal hydroxyl polycaprolactone are used, and an organic tin catalyst is added to carry out a chain extension reaction to form a larger molecular weight chain-extended double-terminal isocyanate compound. Finally, the chain-extended double-terminal isocyanate compound is reacted with the double-terminal hydroxyl compound containing anthracenyl side chain and the double-terminal hydroxyl compound not containing anthracenyl side chain, and an organotin catalyst is added to catalyze the reaction to obtain the high-intensity photoreversible adhesive. The adhesive of the invention undergoes [4+4] cycloaddition reaction under the irradiation of ultraviolet light of 350-405nm, and is cured; it is decrosslinked under the irradiation of ultraviolet light of less than 300nm.