35results about How to "The preparation process conditions are easy to control" patented technology

The invention relates to a hyaluronic acid mixed gel containing amphiphilic microspheres for injection and a preparation method thereof. The microsphere material involves amphiphilic materials such as PLLA-PEG, PLGA, and PLGA-PEG. The molecular weight of PLLA or PLGA is 10,000-500,000, and that of PEG is 1,000-10,000. In PLGA, LA / GA=90 / 10-10 / 90. The average particle size of the microspheres is 1-200 μm, and the mass fraction in the gel is 1-50%; the gel component is hyaluronic acid, or hyaluronic acid cross-linked with divinyl sulfone or glycidyl ether, The molecular weight of hyaluronic acid is 100,000-3,000,000, and the mass fraction is 1-50%. The gel component can also be animal-derived collagen, chitosan, amino acid cellulose, sodium alginate, and the like. The microsphere mixed gel is prepared in a sodium chloride solution or a phosphate buffer solution with an osmotic pressure of 250-350 mOsm / L and a pH of 6.5-7.5. In the present invention, the amphiphilic microspheres are directly mixed with the hyaluronic acid gel, and the amphiphilic microspheres are easily and uniformly distributed in the gel, and after being injected into the human body, they are not easy to assemble into lumps in the water environment of the human body.

The invention relates to a preparation method of artificial heart and cerebral vessels. The preparation method comprises the following steps: (1) preparing a blood vessel main body structure; (2) performing the biological treatment for the blood vessel main body structure; (3) preparing an intermediate layer on the outer surface of the blood vessel main body structure; (3) and preparing an outermost layer on the outer surface of the intermediate layer. By adopting the preparation method disclosed by the invention, the compliance of the artificial heart and cerebral vessels can be greatly improved, so that the degradation rate of the blood vessels and the tissue reconstruction rate are basically kept consistent, and the mechanical stability of the artificial heart and cerebral vessels can be improved. Meanwhile, the artificial heart and cerebral vessels prepared by the method is good in biological compatibility, high in circulation, simple in preparation, and capable of solving the congestion problem of the heart and cerebral vessels.

The preparation method of nano particle iron powder includes the following steps: using high-energy ball grinding mill to ball-pulverize pure reduced iron powder whose grain size is 100-200 meshes under the protection of argon, adding quenched stainless steel ball or hard alloy ball in steel tank or hard alloy tank is ball grinding mill and adding a certain quantity of auxiliary additive. Said invention adopts mechanical alloying (high-energy ball-grinding) method to obtain the pure iron powder with higher chemical stability, and its particle size is less than or equal to 100 nano.

The invention relates to a preparation method for a modified camellia oil fatting agent for leather processing. The method comprises the following steps that a, 850-900 parts by mass of camellia oil, 74-148 parts by mass of n-butyl alcohol and 3-7 parts by mass of catalyzers are taken and added into a reactor; and b, reaction is carried out for 2-3 h at 100-120 DEG C, the hydroxyl value in a reaction system is measured, and by the total amount of reactants, when the hydroxyl value is greater than or equal to 65 mg KOH / g, butyl alcohol which is not fully reacted is removed through reduced pressure distillation.

The invention provides triazine functionalized silsesquioxane based hybrid porous polymer, its preparation method and its application in catalytic degradation of dye pollutants. The invention uses octavinylsilsesquioxane (OVS) and triazine monomers (TAs) substituted by bromophenyl or thiophene as raw materials to prepare a hybrid porous material with photocatalytic performance through Heck reaction; the preparation method is simple, The reaction conditions are easy to realize; the obtained material has good chemical stability, thermal stability and fluorescence characteristics, which greatly improves the specific surface area and pore volume of the silsesquioxane-based hybrid porous material, and exhibits high efficiency for dyes in wastewater Catalytic degradation ability has great potential application value in the field of sewage treatment.

The invention relates to a carbazolyl POSS (Polyhedral Oligomeric Silsesquioxane) monomer and a preparation method thereof. A specific structure of the carbazolyl POSS monomer is shown as a formula (I). The carbazolyl POSS monomer is prepared by taking 1-bromo-4-(N-carbazolyl)benzene and octavinyl silsesquioxane OVS as starting raw materials, and carrying out Heck coupling reaction in a solvent under the action of an acid absorbent, a catalyst and a ligand. According to the carbazolyl POSS monomer provided by the invention, a carbazole derivative is introduced into a POSS structure and the POSS monomer has strong fluorescent characteristics and good thermal stability. The formula (I) is shown in the description.

The invention belongs to the field of macromolecular assistants and particularly relates to an antibacterial plastification assistant for PVC and a preparation method thereof. The structural formula of the antibacterial plastification assistant for PVC is shown as the following description. In the structure of the antibacterial plastification assistant prepared by adopting the preparation method,the antibacterial plastification assistant for PVC has a stronger plastification function due to long chains generated through the reaction of phthalic anhydride and oleyl alcohol; contained N-(4-aminophenyl)-2-hydroxyl benzamide has a stronger antibacterial effect, a sterilization spectrum is wider, meanwhile N-H are increased, and the antibacterial effect is better compared with the effect of salicylanilide. The preparation method of the antibacterial plastification assistant for PVC is simple and easy to operate, preparation process conditions are easy to control, the preparation efficiencyis high, the prices of raw materials and the energy consumption of production are both lower, and the antibacterial plastification assistant is very suitable for large-scale production.

An aluminum part surface microetching method, comprising the following steps: subjecting an aluminum part to pretreatment which involves successive degreasing, neutralizing and alkaline etching treatments; carrying out microetching on the surface of the aluminum part following pretreatment to form micropores on the surface of the aluminum part; subjecting the micropores formed on the surface of the aluminum part to washing and reaming treatments, wherein the microetching treatment involves placing the pretreated aluminum part in a microetching solution for microetching to be carried out, and the microetching solution comprises: 180g / L-200g / L of sulfuric acid, 150ml / L-500ml / L of microM. Further disclosed are an aluminum part composite and a production method therefor.