354 results about "Cotton linters" patented technology

In order to produce a cellulose ester film constructed of a front layer, an intermittent layer and a rear layer, a dope solution is doped on a supporter. In at least one of the front layer and the rear layer, a mass ratio of a cotton linter to a wood pulp (cotton linter/wood pulp) is between 5/95 and 0/100, and a solvent of the dope contains more than 15 wt. % alcohols and hydrocarbons whose carbon number each is 1-10. Further, a ratio of a solid content density of a solution for forming the front layer and the rear layer to a solid density of a solution for forming the intermittent layer is less than 0.9 wt. %, and a total thickness of the solutions for front and rear layers is more than 5% of the dope ribbon.

A mixture composition of a cellulose ether made from raw cotton linters and at least one additive is used in a ready mixed joint compound composition wherein the amount of the cellulose ether in the joint compound composition is significantly reduced. When this joint compound composition is mixed with water and applied to a substrate, the water retention, sag resistance, and workability of the wet joint compound are comparable or improved as compared to when using conventional similar cellulose ethers.

The invention relates to a production method for preparing a dissolving pulp by an oxygen-dissolving and continuous-cooking method, which applies the preparation of cotton linters in the production of viscose fibers in the textile industry, and the method comprises the following steps of: I. cotton linter pretreatments: including cotton linter loosening, cyclone separation and dust removal, feeding, two-roll grinding treatment, etc. to the cotton linters by a two-roll pulping machine; and II. oxygen dissolving and continuous cooking: a horizontal continuous cooking digester is adopted to realize the continuous, fast and low-pollution preparation of dissolving cotton pulp through the actions of high temperature, alkali, oxygen or hydrogen peroxide. The horizontal continuous cooking digester includes a pre-reaction bin, a two-roll gauge, a feeding screw, a T-shaped tube, a continuous-cooking tube and a cold discharge device. The method can effectively solve the problems of: cutting, tearing and cell primary wall breakage to the cotton linters by dry method after feed preparation, physical and chemical stripping to mass impurities in the cotton linters, fast accumulation reduction of the cotton linters in a continuous-cooking device and the purification of alpha cellulose under fast accumulation reduction, recycling of waste heat in the production link, and reduction of total amount of COD in a black liquor, and the method has advantages of even cooking and short cooking cycle.

A composition of a loose mass of comminuted raw cotton linter fibers has a bulk density of at least 8 g/100 ml and at least 50% of the fibers in the mass passes through a US standard sieve size #10 (2 mm opening). This composition is made by obtaining a loose mass of first cut, second cut, third cut, or mill runs raw cotton linters or mixtures thereof and comminuting the loose mass of raw cotton linters to a size wherein at least 50% pass through a US standard sieve size #10 (2 mm opening). This composition is used to make cellulose ether derivatives.

The present invention discloses a cotton pulp with high degree of polymerization and method for preparing said cotton pulp with high degree of polymerization by using cotton linters as raw material. Said preparation method includes the following steps: preparing raw material, digesting, washing material, pulping, removing sand, bleaching, acid treatment, water-washing, filtering and pulp-making, etc.

The invention provides a preparation method of composite pulp of paper pulp and cotton linter for viscose. By utilizing the method, the unique performances of fibers such as bamboos, woods, bast fibers, bagasse and the like can be combined with the excellent performances of cotton; any other two or more than two of raw materials such as the paper pulp or the bamboos, the woods, the cotton, the bast fibers and the like can be steamed and cooked independently and can be composited and prepared into dissolved pulp at a bleaching stage after being subjected to a series of process treatments. The varieties of the paper pulp used in the invention are not limited from production methods and raw materials and can be unbleached pulp or bleached pulp; through alkali steeping treatment, the difficulty in steaming and cooking the paper pulp is reduced, the prepared dissolved pulp has high content of alpha cellulose and the steeping liquor can be cyclically utilized; and by utilizing the method, the pollution in the pulping process is less and the cyclic utilization of the alkali liquor can be realized.

The invention discloses a simple method for producing high-whiteness cotton pulp from cotton linters as raw materials. The method comprises the steps of material preparation, prehydrolysis, boiling, loosening, desanding, concentration, chloridization, alkali purification, bleaching, acid treatment, desanding, concentration, paper making, and oven-drying. A mixture of NaOH and green oxygen is used in the boiling step. The invention has the advantages of simple and controllable process, low processing load posterior to the boiling step, reduced material consumption, less waste discharge, and low environmental pollution. The produced cotton pulp has high pulping fiber strength, yield and whiteness.

This invention provides a process for treating chemical woodpulp, or chemical cellulose including cotton linter, including the step of applying an electron processing technology (EPT) step to chemical woodpulp, or chemical cellulose, as the case may be, on an in-line basis to provide control of pulp viscosity or degree of polymerisation (DP). The invention also provides a method of process control in treating the aforementioned woodpulp or cellulose, including the step of using radiation dose-viscosity relationship curve for applying an EPT step on an in-line basis. The in-line EPT step may, in one form of the invention, replace and hence eliminate a chemical DP reduction step.

The present invention relates to a single layer air-laid composition comprising: hollow synthetic fiber, absorbent and a binder system. The hollow fiber comprises from about 10 to about 50 percent by weight of said composition. The hollow synthetic fiber has a denier of between about 2 to about 18. The hollow synthetic fiber is selected from the class of polyolefins, polyesters, polyamides, acrylics, as well as mixtures and copolymers thereof. The absorbent comprises from about 40% to about 80% of the weight of said composition. The absorbent is a natural absorbent, or a synthetic absorbent, or a mixture of these. The natural absorbent is selected from the class of wood pulp fluff, cotton, cotton linters, and regenerated cellulose fibers, or a mixture of these. The synthetic absorbent is selected from the class of agar, pectin, guar gum, and synthetic hydrogel polymers. The binder fiber comprises from about 3 to about 15 percent by weight of said composition.

A completion and workover fluid composition comprising, water and at least one rheology modifier and/or fluid loss control agent, and at least one other ingredient selected from the group consisting of inorganic salts, shale inhibitors, corrosion inhibitor, biocide, defoamers and finely divided solids particles (e.g., bentonite, attapulgite, sepiolite, calcium carbonate, etc.), depending upon the desired attributes, wherein the rheology modifier and/or the fluid loss control agent is an ethoxylated raw cotton linters or a modified ethoxylated raw cotton linters. The ethoxylated raw cotton linters provides comparable or better rheology and viscosity properties compared to high molecular weight commercial HECs made from purified cotton linters. These ethoxylated raw cotton linters derivatives are suitable for applications in oil-well servicing fluids, particularly to enhance functional properties of completion and workover fluids used during oil-well drilling operations.

The invention relates to a method for preparing activated carbon fibers by the use of cotton linters, comprising the following steps of: placing cotton linters into a fermentation cylinder, inoculating turkey-tail or white rot fungus, performing a fermentation treatment, followed by washing again and drying; placing KOH or NaOH into a reaction vessel, heating until KOH or NaOH is melted; adding the treated cotton linters to the molten NaOH or KOH with the mass ratio of cotton linters to KOH or NaOH being 1:2-4, heating the mixture to the temperature of 600-800 DEG C, and performing a carbonization-activation treatment for 1-1.5 hours. The specific surface of the obtained cotton linter activated carbon fibers is over 2000m<2>/g. The technology provided by the invention is simple and is used to accomplish waste utilization. The prepared activated carbon fibers have large specific surface, strong sorption as well as excellent performance, and can effectively remove harmful pollutants.

The invention relates to a production process of cotton pulp for cellulose triacetate, in particular to a simple production process of cotton pulp using cotton linter as a raw material; in the whole pulping process, the wastewater COD discharge is as low as 20250-25050mg/l, so that the environmental pollution and sewage treatment pressure can be reduced; on the conditions of stable polymerization, high whiteness and alpha cellulose content, uniform fiber length and proper compactness, the product has low content of methylene dichloride extract and metallic ions, low ash content and low dust, thus being applicable to the industry for producing cellulose triacetate.

The invention relates to a naturally degradative short linter plastic film and a manufacture process thereof, belonging to the field of plastic films. The manufacture process comprises the following steps: dedusting short linters, ramie short fibers and silk leftover bits; uniformly mixing according to a proportion; cutting short; placing in a cooking boiler; adding NaOH, anthraquinone and water; increasing temperature; keeping pressure; boiling; preparing pulp by a sulphate pulping method; filtering pulp liquid; cleanly flushing filtered substances; adding water to prepare the pulp liquid; beating the pulp liquid at a beating degree of 50 DEG SR; adding daiamid epoxy chloropropane resin and cellulose to uniformly scatter in a pulp scattering machine; diluting with water; forming handsheets in a water circulating handsheet former; airing the handsheets at a room temperature; steeping the handsheets in a whiteruss steeping tank; immediately fishing out and smoothening the handsheets with a brush; enabling the prepared handsheets, i.e. paper-based semi-finished products of non-weaving cloth, to keep still at the room temperature; steeping the semi-finished products in a sizing liquid steeping tank; immediately fishing out and smoothening the semi-finished products; placing the semi-finished products in an oven to prebake so that sizing liquid is fully permeated and stuck to the semi-finished products; and raising the temperature and baking for molding treatment to obtain the naturally degradative short linter plastic film.

The invention discloses cellulose acetate prepared by taking cotton linter pulp as the raw material and a preparation method and an application thereof. The cellulose acetate is prepared by pulverizing, activating, acetylizing, hydrolyzing, precipitating, rinsing and drying the cotton linter pulp which is used as the raw material. The cellulose acetate is used for manufacturing textile cellulose acetate filaments, membranes, semipermeable membranes, photosensitive films and other materials. The cellulose acetate is prepared by taking cotton linter pulp as the raw material which is easy to obtain, and the preparation method of the cellulose acetate is easy to operate and ensures good product quality.

The invention discloses cellulose pulp and a production method thereof, mainly used for producing cellulose diacetate and cellulose triacetate. In the invention, category II cotton linter, or category III cotton linter with ripeness being 60-70%, or a mixture of category II cotton linter and category III cotton linter are used as the raw material, I type cellulose crystallity of cellulose pulp is within the range of 60-74%, the acetifying reaction has good performance and low cost, and the invention is suitable for commercialized production of cellulose diacetate.

The invention relates to a method for preparing a cellulose sponge by the steps of activating cellulose wood pulp, reacting with urea to prepare dry cellulose carbamate, dissolving the dry cellulose carbamate in a dilute sodium hydroxide solution at low temperature to form a cellulose carbamate solution, then adding cotton linter, a pore former, color paste and the like to the cellulose carbamate solution for uniformly mixing, ageing at low temperature, putting in boiled water and then cooking to make the cellulose regenerate, forming gaps after the dissolution of the pore former in water, alternatively washing with water and weak acid until neutrality appears, soaking in the water emulsion of a softener, and the like.

The invention relates to a process for producing cellulose ether used high polymerised cotton pulp, in particular to a cotton pulp production process mainly used for manufacturing high-viscosity cellulose ethers products, such as carboxymethyl cellulose, hydroxypropyl methylcellulose, etc. by utilizing cotton linters as the raw materials. The process adopts low temperature cooking to prevent carcinogenic toxic substances such as dioxins, organic halides, etc. from being produced through adding chlorine dioxide, thereby having low toxicity, reducing the pollution to the environment, and producing the cotton pulp with high polymerization degree, uniform fiber length, less dust and high alphacellulose content. Besides, the COD discharge amount of the waste water in the practical production is low, and belongs to the low pollutant emission.