134results about How to "Adjustable mechanical properties" patented technology

The invention discloses preparation methods of mineralized hydrogel and a biomimetic mineralized bone repair material. The mineralized hydrogel is prepared by using a photoactivated biomacromoleculesand a photoactivated phosphatase as raw materials; hydrogel is formed by initiating cross-linking by means of light irradiation or initiating polymerization cross-linking by means of a radical initiator; when the hydrogel is put into mineralized liquid, phosphatase can promote the uniform deposition of phosphate in the gel, so that the uniformly mineralized hydrogel is obtained. Phosphoprotein-like molecules are added during the preparation of the hydrogel; the phosphoprotein-like molecules can promote the uniform deposition of phosphate along a molecular network of biomacromolecules, so thatthe high-strength mineralized hydrogel can be obtained. When the phosphoprotein-like molecules and cells are added during the preparation of the hydrogel, the in-situ loading of the cells can be realized, and the enzyme in a process of bone physiological mineralization can be simulated so as to promote a phosphate mineralization process, so that the biomimetic mineralized bone repair material withhigh strength can be obtained, and the personalized customization of the bionic mineralized bone repair material can be realized; therefore, the preparation methods have a broad application prospectin the field of bone tissue engineering.

A method for preparing polyimide fibers belongs to the field of high-performance organic fibers. The method comprises the following steps: preparing a copolymerized polyamide acid spinning solution through condensation polymerization of dianhydride and diamine; adding acetic anhydride and a catalyst in the polyamide acid spinning solution to obtain partly imidized polyamide acid spinning solution; spinning by adopting a wet or dry-wet spinning process, and solidifying and washing to obtain partly imidized polyimide fibers; conducting thermal imidization on the fibers at gradient temperature, and preparing the polyimide fibers with high strength, high modulus and high mechanical performance. The method provided by the invention is used for preparing the polyimide fibers by combination of chemical imidization and thermal imidization, and can be used for further improving the mechanical performance of the polyimide fibers, thereby meeting requirements of various applications.

The invention discloses silicane modified polyurethane sealant used for an automobile and a preparing method thereof. Silicane modified polyurethane polymer, plasticizer, filling, reinforcing agents, cross-linking agents, thickening agents, catalytic agents and an antioxidant are used as raw materials. The preparing method includes the steps that firstly, the silicane modified polyurethane polymer and the plasticizer are evenly mixed at the temperature of 80 DEG C-90 DEG C under the vacuum degree of 0.06 MPa-0.09 MPa; then the filling is added, and stirring and mixing are performed evenly; then the reinforcing agents and the antioxidant are added, dehydrated and blended evenly at the temperature of 100 DEG C-120 DEG C under the vacuum degree of 0.06 MPa-0.09 MPa; finally, the cross-linking agents, the thickening agents and the catalytic agents are added and mixed evenly under the vacuum degree of 0.06 MPa-0.09 MPa to obtain the silicane modified polyurethane sealant used for the automobile. Compared with the same kind of materials, the silicane modified polyurethane sealant used for the automobile is wide in selection range of mechanical properties, and can be used for sealing and adhering of different component of the automobile according to different requirements; the water-resistant performance is excellent, and the safety of automobile operation is ensured; meanwhile, the sealant has excellent mechanical performance and adhesive performance, is resistant to aging, and can be widely applied to the field of automobile manufacturing.

The invention relates to a preparation method of thermosensitive conducting hydrogel with enhanced metal ion coordination, and belongs to the technical field of the thermosensitive conducting hydrogel. The method includes the following steps: (1) dissolving monomeric vinylimidazole and N-isopropylacrylamide in deionized water, adding a crosslinking agent, an initiator and an accelerator, performing prepolymerization after dissolving and uniform mixing, and performing complete reaction to obtain a chemically crosslinked hydrogel precursor; (2) taking out the hydrogel precursor obtained in the step (1), soaking the hydrogel precursor in a solution containing divalent metal zinc, copper, cobalt and nickel ions for coordination, soaking the hydrogel precursor in water to remove redundant uncoordinated ions, and performing swelling equilibrium to obtain the metal-ion-coordinated thermosensitive conducting hydrogel. The preparation method has the advantages that the mechanical strength of the hydrogel is regulated through reversible physical cross-linking between the metal ions and a specific ligand, and the hydrogel has quick thermosensitivity and electrical conductivity.

The invention discloses a method for preparing microcapsules through polymer precoating. The method includes the following steps that firstly, polymer is added into an organic solvent, stirred and mixed evenly to obtain a polymer solution, and then a core material is added, stirred and evenly mixed to obtain a mixed solution; secondly, colloid protector is added into water, stirred and evenly mixed, the mixed solution in the first step is added during stirring, the temperature is raised so that the organic solvent can completely volatilize, and microcapsules of the polymer precoated core material are obtained; thirdly, a wall material is added, stirred and fully cured, and the microcapsules are obtained. The method is good in universality, simple, quick, economical and capable of being widely used in the field of novel microcapsule preparation. The microcapsules are adjustable in size and structure, surface functional modification can be conducted, performance is excellent, and the microcapsules are economical and practical.

The invention relates to the field of high polymer material synthesis and discloses a method for preparing poly(butylene succinate) through a transesterification method. The method comprises the following steps: carrying out esterification reaction on dimethyl succinate, a dihydric alcohol monomer containing 1,4-butanediol and a composite catalyst in a nitrogen atmosphere, wherein the reaction temperature is 110-150 DEG C and the reaction time is 2-3 hours; carrying out condensation polymerization in a vacuum condition, wherein the vacuum degree is 10-300Pa of absolute pressure, the reaction temperature is 150-240 DEG C and the reaction time is 2-3 hours, thereby preparing the poly(butylene succinate). According to the method, on one hand, the problem of high corrosivity of a polymeric monomer in the prior art can be solved, and on the other hand, the problems of multiple byproduct micromolecules and relatively low yield in the prior art can be solved, so that the production cost of the poly(butylene succinate) can be effectively reduced.

The invention provides a biodegradable poly-caprolactone artificial breast wall material and preparation method thereof, wherein the material comprises 10-70% of chitosan fiber and balancing ploycaprolactone. When short chitosan fiber is employed, the short chitosan fiber is weighed and mixed with ploycaprolactone and stirred in high speed mixing machine, the premix is compounded, squeezed and granulated with a double bolt extrusion machine, or compounded and squashed with a closed-smelting machine, then is subject to compression moulding on vulcanizing press and cut into samples. The invention also provides the preparing method for the situation when long chitosan fiber is employed.

The invention provides a method for preparing lamellar zirconium boride ultrahigh-temperature ceramic through a casting method. The method is characterized by comprising the following steps of: (1) respectively preparing two zirconium boride casting sheets with different components and thicknesses by adopting the casting method: firstly adding a binder and a plasticizer to a solvent, uniformly stirring, then respectively adding zirconium boride ceramic powder, uniformly stirring to form two casting materials with different components, then carrying out casting forming, and drying and demoulding at room temperature to respectively obtain a zirconium boride casting sheet A with the thickness of 300-1000 micrometers and a zirconium boride casting sheet with the thickness of 20-100 micrometers; (2) respectively slicing the zirconium boride casting sheet A and the zirconium boride casting sheet B according to the size of a mould; (3) alternately overlapping the sliced zirconium boride casting sheet A and the sliced zirconium boride casting sheet B, placing into a graphite grinding tool, and degreasing in vacuum; and (4) carrying out hot pressed sintering in an argon atmosphere at the sintering temperature of 1900-2000 DEG C under the pressure of 20-40 MPa so as to obtain the lamellar zirconium boride ultrahigh-temperature ceramic. A casting forming technology is adopted in the invention and the method has simple process; and in addition, an obtained material reaches high toughness value at 9.3 MPa.m<1 / 2>.

The general structural formula of the multi-block copolyester disclosed in the present invention is: in the formula, R represents the hydrocarbon group of diisocyanate, x, a, b are all integers from 2 to 10, and y and c are integers from 0 to 8 , and when x=b, y≠c, when y=c, x≠b, j, k, n are all integers greater than 5, and the intrinsic viscosity of the multi-block copolyester is 0.7~4.7dL / g , the melting point is 70-240°C, the tensile strength is 10-67MPa, and the elongation at break is 20-1100%. The invention also discloses a preparation method of the multi-block copolyester. The multi-block copolyester prepared by the invention has high melting point and molecular weight, good mechanical properties, and better controllability and repeatability than the traditional transesterification method, which can make the multi-block copolyester prepared by it have a wider application range. for extensive.

The invention relates to a multifunctional intelligent fiber or fabric. The multifunctional intelligent fiber or fabric is obtained by directly extruding a mixed sizing agent containing oxidized nanocellulose and a MXene material into a solvent for forming; the weight ratio of the oxidized nanocellulose to the MXene material in the mixed sizing agent is 9:1-3:7, preferably 7:3-1:2, and more preferably 1:1.