159results about How to "Improve water solubility" patented technology

The invention provides a method for preparing a macroporous reticulated polyvinyl alcohol spherical vector. The method comprises the following steps: firstly, polyvinyl alcohol, calcium carbonate, sodium alginate and water are mixed in a certain mass proportion, and stirring is performed for full dissolution of the polyvinyl alcohol and uniform mixture, and then white PVA sol is obtained; secondly, the sol obtained is added into saturated boric acid solution containing 3 percent of calcium chloride by a peristaltic pump, and PVA gel beads are formed, cleaned by water and then placed into diluted hydrochloric acid solution for dipping until no air bubble is generated; thirdly, a spherical vector is thrown into glutaral pentanedial water solution and adjusted into acidity so as to generate crosslinking reaction to form a more stable crosslinking structure; and fourthly, the spherical vector is dipped into water and cleaned into neutrality, and then the white macroporous reticulated PVA spherical vector with elasticity is obtained. The macroporous reticulated polyvinyl alcohol vector prepared by the method has stable macroporous reticulated structure and good hydrophilicity, physical and chemical stability and anti-biological degradability, is suitable for immobilized enzymes and microorganisms so as to form a plurality of bed-shaped bioreactors, and is used in the modern bioengineering field such as sewage treatment and so on.

The invention belongs to a carbon material anti-oxidation coating technique, and relates to a preparation method for a carbon material anti-oxidation coating. The coating mainly comprises 30 to 50 percent of SiC, 1 to 10 percent of Al(OH)3, 15 to 35 percent of SiO2 and 5 to 40 percent of kaolin, and is prepared by the following steps: dissolving Al(OH)3 in H3PO4 in a proportion of 5 to 15 ml/g; adding water into the mixture to dilute the mixture and then mixing the diluted mixture with the other components by stirring; brushing the obtained coating material on a surface of the carbon material; curing the coating in a baking box at a low temperature for use. When a mark needs to be displayed on the surface of the carbon material, 10 to 40 percent of TiO2 powder is added into the coating. By using the method, the anti-oxidation coating of compact structure and high anti-oxidation performance can be formed through only one brushing process and one curing process in the baking box at a low temperature; and the anti-oxidation coating is oxidized for 15 hours in static air of 700 DEG C with weight-loss ratio no more than 1 percent; therefore, the method is particularly suitable for rapid anti-oxidation processing in the actual production of the carbon material.

The invention belongs to the technical field of surfactants for fine chemistry and discloses a novel sugar-based surfactant, namely, alkoxyethyl-beta-D-xylopyranoside in order to solve the problem of limitation to application of traditional alkyl glycoside as the surfactant due to the fact water solubility of traditional alkyl glycoside is gradually reduced with increase of carbon chain length. Compared with traditional alkyl glycoside with the same carbon chain length, the surfactant has better water solubility and surface activity as well as selectable and controllable foaming capacity and emulsifying property. Besides, raw materials for synthesis comprisexylose obtained from waste crop leftovers and naturally-sourced fatty alcohol and have rich sources. The glycoside can be widely applied to application industries such as biochemical engineering, pharmacy, pesticides, food processing, cosmetics, scientific research and the like.

The invention discloses a method for symbiotic rotational culture of rice, crayfishes, ducks and crabs, and relates to the field of agricultural ecological cultivation. The method comprises the following steps: in the middle ten days of January, digging cultivation ditches around a rice field, planting waterweed and typha angustifolia, arranging an anti-escape net around the rice field, placing juvenile crayfishes into the rice field in the first ten days of April, artificially cultivating rice seedlings in a greenhouse in the middle ten days of May, transplanting the seedlings into the rice field, irrigating water into the rice field, adding a nutrient into the water, placing juvenile crabs into the cultivation ditches and the rice field in the middle ten days of July, feeding ducks in abreeding shed in the last ten days of August, arranging fences on the periphery of a rice stubble field in the first ten days of November, and breeding the ducks in the rice field. The ducks, the crayfishes and the crabs are cultured alternately, the utilization rate of the rice field is increased, furthermore, mutual swallowing of the cultured products can be prevented, the rice and the culturedproducts mutually provide nutrients for each other, effective circulation of an ecological system is realized, resources are reasonably utilized, and the culture cost is saved.