30results about How to "Improve chemical structure" patented technology

The invention relates to a planting method of imitating wild Polygonatum, the following processing equipment is used in the planting method of imitating wild Polygonatum, the processing equipment includes a floor frame, a material distributing device and a planting device, the bottom frame is a U-shaped structure, the bottom frame A planting device is installed in the middle of the upper end, and a material distributing device is arranged above the planting device, and the material distributing device is installed on the bottom plate frame. The present invention can solve the problem that when the existing Rhizoma Polygonatum is planted and processed, manual cultivation is usually carried out manually, which has high labor intensity and low efficiency, which is not conducive to the large-scale planting of Rhizoma Polygonatum, and when the existing equipment is planting Rhizoma Rhizoma Polygonatum, planting The effect is poor, the efficiency is low, and the seedlings after planting are prone to dumping. At the same time, the seedlings cannot be effectively protected during the planting process, which is easy to cause damage to the seedlings and affect the survival rate of the seedlings.

The invention discloses a preparation method of micro-branched micro-crosslinked polyacrylamide. The preparation method comprises the following steps: adding an acrylamide monomer of which the mass percent is 20-30% into water; then adding dimethylaminoethyl methacrylate, persulfate, a chain transfer agent, EDTA and manganese acetylacetonate, regulating the pH value to 5-8, and initiating a polymerization reaction at 20-40 DEG C; after 5-10 hours of reaction, taking out a colloid, and performing granulation; and the adding NaOH accounting for 1.5-3% of the mass of the colloid, and performing hydrolysis at 80-100 DEG C for 1-3 hours to obtain the finished product. The micro-branched micro-crosslinked polyacrylamide prepared by the method disclosed by the invention has high viscosity, and has excellent thermal stability and mechanical shearing resistance; and experiments indicate that the viscosity retention rate of the micro-branched micro-crosslinked polyacrylamide disclosed by the invention after mechanical shearing is more than 81%, and the viscosity retention rate after 90 days of aging is 79% or above. The method disclosed by the invention has the advantages of mild reaction conditions, simple operation process, low cost and the like.

The invention relates to a method of producing ethylene carbonate by catalytic addition from ethylene oxide and CO2. In the method, under the effect of an environment-friendly ionic liquid catalyst, the CO2 and the ethylene oxide are added to prepare the ethylene carbonate. When the reaction temperature is 90-130 DEG C, the reaction pressure is 1-3 MPa, the stirring speed is 200-300 r / min and the reaction time is 1-2 h, the conversion rate of the ethylene oxide reaches more than 98% and the yield of the ethylene carbonate reaches more than 94%. Conversion rate and yield are both higher than 90% even the catalyst is repeatedly used for seven times.