117results about How to "Preparation method green" patented technology

The invention discloses a chitin / graphene composite hemostatic sponge and a preparation method thereof. The method comprises the following steps: mixing and ball-milling a certain amount of flake graphite and chitin, dissolving the obtained mixture in a NaOH / urea solvent, centrifuging the obtained solution, performing uniform dispersing, crosslinking the obtained material with an epichlorohydrin crosslinker, and standing, dialyzing and lyophilizing the crosslinked material to obtain the chitin / graphene composite sponge. The composite sponge has the advantages of excellent blood coagulation andhemostasis effects, good biodegradability and good cell compatibility. Compared with the prior art, the method for preparing the chitin / graphene composite material by using a ball milling-assisted stripping process has the advantages of simplicity, and easiness in implementation; the synergistic action of chitin and graphene makes the hemostatic sponge have an excellent hemostasis property; and the chitin is used as the raw material, so the prepared composite sponge is biodegradable, has good cell compatibility, and avoids the risk of secondary bleeding caused by the removal of the hemostaticmaterial after hemostasis treatment.

The invention discloses a bamboo cellulose aerogel thermal insulation material and a preparation method and application thereof. The preparation method comprises the steps of removing lignin from bamboo processing waste by bleaching to obtain holocellulose; After being configured into a suspension, it is ultrasonically broken, and then subjected to pre-freezing and vacuum freeze-drying in sequence. The preparation method of the bamboo cellulose aerogel thermal insulation material provided by the invention comprises a chemical treatment step, an ultrasonic treatment step and a freezing treatment step, which can greatly reduce the use of chemical agents, and is environmentally friendly; the preparation process is simple, and the energy consumption is low. Low cost, short preparation time, wide source of raw materials, low price, low cost, and broad practical application prospect; the prepared bamboo cellulose aerogel thermal insulation material has certain strength and good thermal insulation effect, which can effectively improve bamboo processing. The utilization rate of waste and the added value of the industry have expanded the way of recycling bamboo processing waste, which is of great theoretical significance.