1420 results about "Modified cellulose" patented technology

The present invention relates to a method of producing a cellulose based paper, the paper itself and the use thereof where the paper exhibits enhanced mechanical properties. The method involves providing a suspension of well dispersed modified cellulose at a low concentration. The properties and the chemical structure of the paper make it suitable for in vivo applications such as implant material.

The invention provides a water-based drilling fluid composition containing an amine compound, which comprises the following components: a 0.5 to 5 weight percent of water-based amine compound as shown in formula I: RHN-Y-[OY']X-NHR', wherein Y, Y',x, R and R' are as defined in a manual; 0.1 to 1.0 weight percent of water-based tackifier which is selected from one or more types of xanthan gum, acrylamide-acrylic copolymer and hydroxyl ethyl cellulose; 0.5 to 5 weight percent of water-based fluid loss agent which is selected from one or more types of modified lignite, acrylic polymer, modified starch and modified cellulose; 2 to 12 weight percent of water-based inhibitor which is selected from one or more types of potassium chloride, potassium sulfate, formic acid, formic acid sodium, potassium chloride and epoxypropyltrimethylammonium chloride; and the composition can also further comprises coating agent, weighting agent, lubricant, borehole stabilizer and the like. The water-based drilling fluid composition has good inhibiting performance to clay shale drilling cuttings.

The invention discloses a preparation method of modified cellulose adsorbents. The preparation method comprises the following steps: (1) activating cellulose in alkaline aqueous solution to obtain activated cellulose; (2) reacting the activated cellulose with epoxy chloropropane to obtain epoxy cellulose; (3) reacting the epoxy cellulose with an oxidizing agent to obtain epoxy dialdehyde oxidized cellulose; (4) reacting cyclodextrin with epoxy dialdehyde oxidized cellulose to obtain cyclodextrin grafted modified cellulose; and (5) reacting the cyclodextrin grafted modified cellulose with amino-terminated hyperbranched polymer to obtain the modified cellulose adsorbents. The raw material source is wide, the price is low, and the environment-friendly effect is achieved; the preparation method is simple, the reaction condition is mild, the equipment requirement is low and scale production is facilitated; and the prepared adsorbent has stable performance and broad-spectrum adsorption capacity for heavy metal ions, dyes and other organic matters and is environment-friendly, the cellulose additional value is remarkably promoted, and good economic and social benefits are achieved.

The present invention provides a method for producing modified nanofibrillated cellulose characterized by bringing cellulosic material into a fiber suspension, adsorbing a cellulose derivative or polysaccharide or polysaccharide derivative onto fibers in said fiber suspension under special conditions and subjecting the obtained fiber suspension derivative to mechanical disintegration. A modified nanofibrillated cellulose obtainable by a method of the present invention is provided. Furthermore, the invention relates to the use of said modified nanotibrillated cellulose.

The present invention provides an aqueous composition useful for CMP of a semiconductor wafer containing a metal comprising oxidizer, inhibitor for a nonferrous metal, complexing agent for the nonferrous metal, modified cellulose, 0.001 to 10% by weight copolymer blends of a first copolymer and a second copolymer and balance water.

The invention discloses a dust inhibitor, which comprises the following raw material in percentage by weight: 0.6 to 0.8 percent of plant seed colloid, 0.1 to 0.3 percent of modified cellulose, 0.05 to 0.09 percent of dispersant and the balance of water. The dust inhibitor can be prepared at normal temperature in a common mixing equipment from mixed aqueous solution of plant seed colloid, modified cellulose, crosslinking agent, dispersant and reinforcing agent; and after being prepared, the dust inhibitor can be sprayed onto the surface of coal in carriages to allow the coal to form a layer of cured film on the surface, the viscosity of the film is high, the wind corrosion rate of the film is low, so that the dust pollution along railways in railway transportation of the coal and the dust loss of the coal are avoided. Besides, dust inhibition in railway coal transportation, the dust inhibitor can be used for dust inhibition on roads in mining areas, urban roads, constructions sites, stations, ports and the like so that the dust inhibitor can be used almost without being limited by fields, and the dust inhibitor can be widely used.

The invention discloses a method for preparing a bifunctional modified cellulose adsorbing agent from peanut shells and application of the method. The method comprises the following preparation steps of: washing, drying and crushing waste peanut shells, which are taken as raw materials, and removing flavochrome, hemicellulose and xylogen from the crushed peanut shells so as to obtain peanut shell cellulose; and performing surface functional modification on the materials through substitution and amidation further so as to finally obtain the amino and carboxy bifunctional modified peanut shell cellulose adsorbing material. The product is powdery and light brownish yellow, and the particle size of the product is 1.5-2.5 microns. The bifunctional modified peanut shell cellulose adsorbing material has a good adsorption effect for excessive heavy metals such as copper, chrome and mercury, phosphate, methylthionine chloride dye, and the like in water. The adsorbing agent is simple in preparation method, low in cost, cheap, easily available, good in biological compatibility and environment-friendly, contains a great deal of functional chelation groups, can realize simultaneous adsorption and removal of negative ions and positive ions, and has the advantages of being recyclable and the like.

The invention provides a cigarette core material for heating incombustible cigarettes. The cigarette core material is prepared from the following components in percentage by weight: 10-50% of tobaccofiber and tobacco powder, 5-30% of wood pulp fibers, 5-30% of one or more of hemp fibers, bamboo fibers, soybean fibers, cocoon fibers, cotton fibers, polylactic acid fibers and modified cellulose fibers, 10-50% of tobacco essence, 10-30% of smoke producing agent, 1-10% of heat conduction material, 1-10% of phase change absorption material and 1-20% of paper coating component which is selected from one or more of a hydrophobic material, a microcapsule suspension and an essence suspension containing the tobacco powder. According to the cigarette core material, the heat conduction material is added, so that the heat can be uniformly conducted; the cigarette core paper is uniformly heated in the heating process; in addition, the phase change absorption material is used and is capable of achieving phase change and absorbing heat under the heated condition so as to prevent the cigarette core material paper from being locally overheated in the heating process.

Dry solids of anionically modified cellulose nanofibers with good redispersion are provided by incorporating 5 to 300% by mass of a water-soluble polymer relative to the anionically modified cellulose nanofibers during the preparation of the dry solids of anionically modified cellulose nanofibers.

The invention discloses an esterification modification method for wood fiber biomasses, comprising the following steps of: firstly, pretreating wood fiber biomasses, i.e. drying and smashing; carrying out pre-ball milling; adding esterification reagent, and continuously carrying out ball milling to carry out an esterification modification reaction; and washing and drying products after the reaction to obtain the esterified modified products of the wood fiber biomasses. According to the method, various wood fiber biomasses are taken as raw materials, wide in source, low in cost, and high in resource utilization rate, and the conventional mode of the single modified cellulose can be changed; and the wood fiber biomasses are esterified in the process of ball milling, the esterification reaction can be carried out within a dissolved homogeneous system or a heterogeneous system in which the solvent is dispersion medium, and the esterification modification method is simple in modifying technology, environment-friendly, and free from the generation of 'the three wastes', and does not need recover the solvent. The infrared and weighing method result shows that the product is good in esterification effect, very good in practical applicability, and better in economic prospect.

The present invention provides an aqueous composition useful for polishing copper on a semiconductor wafer comprising by weight percent 1 to 15 oxidizer, 0.1 to 1 inhibitor for a nonferrous metal, 0.05 to 3 complexing agent for the nonferrous metal, 0.01 to 5 carboxylic acid polymer, 0.01 to 5 modified cellulose, 0.0001 to 2 salt having a cationic and an anionic component, and balance water, the salt reducing noise level from vibration between the wafer and a polishing pad.