8 results about "Oxidized cellulose" patented technology

The application discloses a method for preparing nanocellulose based on guanidinium sulfamate low eutectic solvent, and belongs to the field of modified nanocellulose materials. Firstly, in a certain temperature, water is used as a reaction medium, sodium periodate is used as an oxidant, and lithium chloride is used as a catalyst to oxidize cellulose into dialdehyde cellulose DAC. Secondly, a guanidinium sulfamate-choline chloride binary eutectic solvent or a guanidinium sulfamate-glycerol binary eutectic solvent is configured, and then DAC is added into the two kinds of eutectic solvents respectively. DAC is swollen in the two kinds of eutectic solvents and reacts with guanidinium sulfonic acid groups to graft guanidinium sulfonic acid groups. In the process, the cellulose is swollen in the solvent and the surface charge density is increased, which promotes the subsequent ultrasonic nanocrystallization process, and the guanidinium sulfonic acid group nanocellulose with high transparency and good flame retardant effect is successfully prepared. The application has the advantages of simple operation, low cost, effective reduction of energy loss in the nanocrystallization process of fibers, good flame-retardant modification effect on nanocellulose, environmental friendliness of the used eutectic solvent, and facilitation of industrial production and application of the guanidinium sulfonic acid group nanocellulose and guanidinium sulfonic acid group nanocellulose membrane.

Carboxylated cellulosic nanofibers (CNFs) having a degree of oxidation (DO) from about 0.5 mmol·g⁻¹–about 2.5 mmol·g⁻¹, wherein the CNFs are obtained by treating a non-plant biomass feedstock using a nitro-oxidation process (NOP), and wherein the DO is measured on washed oxidized cellulose obtained by the NOP at a pH greater than about 2.5.

The application belongs to the technical field of chemical industry, and particularly relates to a sulfated titanium-iron oxide, a preparation method and application thereof. FeCl3 solution is added into an oxidized cellulose aqueous solution, and first mixing and stirring is carried out, then TiCl4 solution is added, second mixing and stirring is carried out, and then ammonia water is added drop by drop into the mixed solution to adjust the pH value to 8.6-9.2; a precipitate is obtained, the precipitate is filtered and washed, and then is immersed in a sulfuric acid solution, and then is fully washed and calcined to obtain the sulfated titanium-iron oxide. The catalyst provided by the application not only has high catalytic effect, but also maintains good catalytic activity and selectivity in the reaction process, and the catalyst can be recycled and reused through an external magnetic field.

Provided is an emulsifier containing cellulose and a thickener, wherein the cellulose includes oxidized cellulose that is an oxide of a cellulosic raw material oxidized with hypochlorous acid or a salt thereof, and / or nanocellulose that is a defibrated product of the oxidized cellulose, and does not substantially include N-oxyl compounds.

A composition comprising cellulose and a thickening agent, the cellulose comprising oxidized cellulose and / or nanocellulose, the oxidized cellulose being an oxide of a cellulose-based raw material obtained from hypochlorous acid or a salt thereof, and substantially not comprising an N-oxy compound, the nanocellulose being a defibrated product of the oxidized cellulose, the composition being characterized in that the oxidized cellulose is an oxide of a cellulose-based raw material obtained from hypochlorous acid or a salt thereof, and the nanocellulose being a defibrated product of the oxidized cellulose.

A pesticide formulation includes a pesticide active ingredient, nitro-oxidized cellulose nanofibers (NOCNFs), and water. The NOCNFs can have a degree of oxidation between about 0.8–about 3.0 mmol –COOH / g. The NOCNFs can include a counterion selected from the group including sodium, potassium, ammonium, or a combination thereof. The NOCNFs can be included in a range of about 0.01 wt%–about 5 wt%.

The application discloses a multifunctional wood-based heat insulation film and a preparation method thereof. The preparation method comprises the following steps: firstly, obtaining a micro-nano level oxidized cellulose water dispersion by performing multi-step solvent encapsulation treatment on industrial pulp; and secondly, using a chitosan and sodium lignosulfonate aqueous solution to prepare sodium lignosulfonate nanoparticles as a functional filler. The synthesis method is simple, raw materials are widely sourced, the comprehensive performance of cellulose and lignin is combined, the preparation cost is low, the obtained wood-based film has stable mechanical performance and heat insulation performance, and the wood-based film is expected to become a substitute for traditional heat insulation building materials.

The invention discloses a preparation method of pseudo-boehmite, which comprises the following steps: mixing sodium hydroxide and aluminum hydroxide according to a Na / Al molar ratio of 1.5-4.5, and reacting at 80-130 DEG C for 10-12 hours to obtain a sodium aluminate solution; and carrying out a neutralization reaction on a mixed solution of oxidized cellulose and an aluminum salt and the sodium aluminate solution under the conditions that the temperature is 55-75 DEG C and the pH value is 6.5-8.5, after the neutralization reaction is finished, carrying out an aging reaction under the conditions that the temperature is 60-80 DEG C and the pH value is 7.0-9.0, and washing and drying to obtain the pseudo-boehmite. According to the method, specific sodium aluminate-aluminum salt-modified cellulose is taken as a raw material, and oxidized and modified cellulose is directly introduced into aluminate, so that the finally prepared pseudo-boehmite product has a fibrous structure, large specific surface area, large pore volume and high peptizing property, and has industrial application potential. In addition, the preparation method is simple and low in process cost.