42results about How to "Increase the content of functional groups" patented technology

This case involves a spherical polytetrafluoroethylene micropowder wax and its preparation method, including: PTFE raw materials and organosiloxane adsorbents are jointly irradiated and pulverized in an aerobic environment to obtain polytetrafluoroethylene micropowder, Subsequently, spherical polytetrafluoroethylene micropowder wax was prepared by dispersion polymerization. In the preparation process of the present invention, the fluorine-containing gas produced in the irradiation process can be consumed, and the damage to the microscopic appearance of the polytetrafluoroethylene micropowder can be reduced; the conversion rate of the terminal carboxyl group of the polytetrafluoroethylene chain can be improved, and the content of functional groups on the surface of the micropowder can be increased, thereby It is more conducive to subsequent chemical modification; the end of the polymer chain is active, and it is easy to graft to obtain products with different properties. It can also be modified by using active functional groups at the end of the polymer chain, such as carboxyl and hydroxyl groups, to form a comb polymer and expand its application. Range: The morphology of PTFE micropowder is not greatly damaged, and it is also very easy to form a spherical shape during chemical modification. The obtained micropowder has a small particle size, uniform size, and good dispersion performance.

The invention discloses a method for preparing a collagen peptide grafted hydrothermal carbon microsphere adsorbent, comprising: (1) preparation of collagen peptide powder; (2) preparation of carboxylated hydrothermal carbon microspheres; (3) Disperse 1-10 parts of carboxylated hydrothermal charcoal microspheres in 20-50 parts of ultrapure water, sonicate for 1-3 hours, stir, and add 1-10 parts of 1-ethyl-(3-dimethylaminopropyl) The mixture of carbodiimide EDC and N-hydroxysuccinimide NHS activates the carboxyl group of hydrothermal charcoal, and reacts in ice bath for 30-90 minutes, then adds 1-50 parts of collagen peptide powder, and reacts in ice bath for 30-90 minutes , removed from the ice bath, filtered at room temperature for 24 hours, washed, and dried to obtain the collagen peptide grafted hydrothermal carbon microsphere adsorbent. The collagen peptide grafted hydrothermal carbon material of the present invention has high adsorption capacity and Selectivity can be applied to the treatment of wastewater containing heavy metal ions; the preparation method of the invention is simple in operation, high in efficiency, simple in preparation process, strong in practicability and low in cost, and the obtained adsorbent is an environmentally friendly material.

The invention provides a modified carbon material, a preparation method thereof, and a redox flow battery electrode modified by a graphene-like nanosheet prepared from the same. The preparation methodcomprises the steps of: 1) subjecting phytic acid and an amino group-containing substance to in-situ polymerization on the surface of the carbon material; and 2) calcining the product at a high temperature. The carbon material treated by the method has rich oxygen-containing functional groups on its surface, and has greatly improved hydrophilic property, electrochemical activity and specific surface area. Moreover, the loading amount of hetero elements such as nitrogen and phosphorus can be controlled by adjusting the amount and molar ratio of phytic acid and urea. The electrode has high specific surface area and a high functional group content (for example, the oxygen-containing functional group), and exhibits good catalytic activity for both the positive and negative electrode pairs ofan all-vanadium redox flow battery, and the high catalytic activity of the electrode greatly reduces the polarization of the electrode.

The invention provides a modified carbon fiber / SiO 2 The preparation method of the airgel composite material comprises the steps of: desizing the carbon fiber, and after nitric acid oxidation treatment, using silane coupling agents KH-550 and KH-560 to carry out surface modification and grafting treatment to obtain the modified carbon fiber; Stir and disperse the modified carbon fiber and silicon dioxide wet gel evenly, and freeze-dry after drying, aging, hydrophobic modification and soaking. The preparation method of airgel composite material of the present invention strengthens SiO by adopting the modified carbon fiber 2 The performance of airgel, the chemical cross-linking combination of the two has better mechanical properties than the previous physical combination, the whole operation method is simple, the operating conditions are mild, the steps are closely connected, and the prepared material has good performance.

The invention provides a modified carbon material and a preparation method thereof, and a nitrogen-enriched liquid flow battery electrode prepared from the material. The preparation method comprises: 1) a substance containing an amino group and a substance containing a hydroxyl group are placed on the surface of the carbon material Carrying out in-situ polymerization reaction, and 2) calcining to obtain the modified carbon material. The carbon material treated by this method is rich in nitrogen-containing functional groups and oxygen-containing functional groups on the surface, and its hydrophilic performance, electrochemical activity and specific surface area are greatly improved. Moreover, the loads of nitrogen and oxygen elements can be controlled by adjusting the amount of formaldehyde-urea-melamine. The electrode has a high specific surface area and a high functional group content (such as an oxygen-containing functional group), especially for the main redox couple of the vanadium ion, which shows good catalytic activity, and its higher catalytic activity greatly reduces the polarization of the electrode. .