118 results about "Cellulose acetate propionate" patented technology

The invention relates to a preparation method of cellulose acetate propionate, belonging to technical field of cellulose modification. The preparation method of cellulose acetate propionate comprises the following steps of: taking cellulose as a raw material, activating by a mixed solution of acetic anhydride and propionic anhydride, adding acetic acid and propionic acid solvents and a solid super acidic catalyst for esterification, after esterification, filtering to remove the catalyst, adding waste acid water for hydrolyzing, settling out by waste acid water, and finally obtaining the cellulose acetate propionate by steps of filtering, washing, drying and the like. The production process is simple to operate, the solid super acidic catalyst substitutes the concentrated sulfuric acid catalyst and can be cyclically used for many times, thus alleviating the problem of serious corrosion of the original process equipment. The waste acid water generated in the reaction process only contains acetic acid and propionic acid without sulfuric acid and can be fully recovered and cyclically used, thus decreasing the tension in environmental protection, realizing zero discharge and greatly reducing the production cost. The cellulose acetate propionate prepared by the method has fine toughness, heat stability and compatibility, thus being extensively used.

The invention discloses a polarized lens and a method for manufacturing the same. In the process of manufacturing the polarized lens of the invention, a poly vinyl alcohol (PVA) membrane is inserted between a tri acetyl cellulose (TAC) membrane and a cellulose acetate propionate (CAP) membrane or between the tri acetyl cellulose (TAC) membrane and a polymethyl methacrylate (PMMA); or materials with different chemical properties and physical properties are attached to two sides of the poly vinyl alcohol (PVA) membrane, and then the polarized lens is manufactured. The polarized lens is used for preventing foreign matters from hurting eyes or dazzling caused by light rays, and has excellent transparency.

The invention relates to a preparation method of a uniform-cell and high-buffer polylactic acid foamed material. The foamed material comprises a main material and an auxiliary material, and the main material comprises polylactic acid, EVA elastomer, cellulose acetate propionate, esterification modified nano-cellulose, polylactic acid grafted maleic anhydride and gelatin; and the auxiliary material comprises an antioxidant, a plasticiser and an ultraviolet resisting agent. The main material comprises, by mass, 100 parts of polylactic acid, 20-35 parts of the EVA elastomer, 8-15 parts of cellulose acetate propionate, 3-6 parts of esterification modified nano-cellulose, 4-8 parts of polylactic acid grafted maleic anhydride and 3-6 parts of gelatin. The auxiliary material comprises 2-4 parts of the antioxidant, 2-4 parts of the plasticiser and 2-4 parts of the ultraviolet resisting agent. The foamed material is prepared through a premixing, autoclave foaming and liquid nitrogen cooling technology, has the advantages of effective guaranteeing of cell uniformity, high foaming rate and good buffering performance, and can be used in the field of packaging buffering.

Cellulose mixed esters are disclosed having low molecular weights and low degrees of polymerization. These new cellulose mixed esters include cellulose acetate propionate and cellulose acetate butyrate. The esters exhibit solubility in a wide range of organic solvents with minimal viscosity increase, are compatible with a wide variety of resins, and are useful in coatings and inks compositions as binder resins and rheology modifiers.

The present invention relates to a polylactic acid composite material. The composite material is compounded and prepared by using polylactic acid, polylactic acid grafted glycidyl methacrylate, starch grafted polylactic acid, acetate esterified nano cellulose, acetate propionate cellulose and an antioxidant through melting extrusion in two steps. According to the composite material disclosed by the present invention, the preparation process is simple, the composite material has excellent strength and toughness due to excellent compatibility between each component, so that the composite material can be widely used in the environment protection packaging and industrial fields with the requirements of high strength and high toughness.

An enteric coating for a solid pharmaceutical carrier or substrate wherein the enteric coating includes a cellulosic polymeric material selected from selected from the group consisting of hydroxypropyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, ethyl cellulose, cellulose acetate, cellulose acetate butyrate, cellulose acetate phthalate, cellulose acetate succinate, cellulose acetate propionate, cellulose acetate trimellitate, hydroxypropylmethyl cellulose phthalate, hydroxypropylmethyl cellulose succinate, hydroxypropylmethyl cellulose acetate succinate, cellulose acetate succinate butyrate, cellulose acetate succinate propionate, carboxymethylcellulose sodium, cellulose butyrate, and mixtures thereof and a plasticizer selected from a water-soluble preparation of a fat-soluble vitamin. A preferred plasticizer is Vitamin E polyethylene glycol 1000 succinate.

A nutrient composition, a lipid metabolism-improving agent, and prophylactic and / or therapeutic agents typically for inflammatory bowel diseases, immune disorders, cancers, non-alcoholic steatohepatitis, obesity, diabetes, and hypercholesterolemia each contain a cellulose acetate having a total degree of acetyl substitution of 0.4 to 1.1. The cellulose acetate may be one having a compositional distribution index (CDI) of 2.0 or less, where the CDI is defined by the formula:CDI=(Measured value of half height width of chemical composition) / (Theoretical value of half height width of chemical composition)where the measured value of half height width of chemical composition represents a half height width of chemical composition determined by HPLC analysis of a cellulose acetate propionate prepared by propionylating all residual hydroxy groups of the cellulose acetate (sample), andthe theoretical value of half height width of chemical composition =2.35482√{square root over (3*DPw*(DS / 3)*(1−DS / 3))} / DPw  [Math. 1]where DS is the total degree of acetyl substitution; and DPw is a weight-average degree of polymerization determined by a GPC-light scattering method using a cellulose acetate propionate prepared by propionylating all residual hydroxy groups of the cellulose acetate (sample).

Improvements in a mini-osmotic pump and coating compositions are described. The dispensing pump includes an inner fluid-filled bag encased by an osmotic layer and outer, semi-permeable membrane. The inner bag is formed with an arcuate edge at the open end of the bag to inhibit formation of fissures in the outer membrane in this edge region. The coating compositions include cellulose acetate butyrate, cellulose acetate propionate, and polymethylmethacrylate polymers, optionally mixed with ethyl cellulose in acetone based solvent systems.

The invention discloses a preparation method for water-soluble cellulose acetate propionate mould-pressing and aluminium-plating emulsion. The preparation method comprises a step of weighing the substances of cellulose acetate propionate, methyl methacrylate, butyl methacrylate, ethyl acrylate, dicyclopentadienyl acrylate, acrylic acid and N-hydroxyethyl acrylamide in a weight ratio, a step of preparing a pre-mixing solution, namely, performing mixed reaction on cellulose acetate propionate, an organic solvent, an initiator and a part of monomers, and a step of preparing pre-emulsion, namely, mixing a non-ionic emulsifier with an anionic emulsifier at first, and then adding the remainder substances to prepare the pre-emulsion, adding the pre-emulsion in a reaction kettle to react after the initiator is completely dissolved, dropwise adding ammonia water to neutralize, and finally diluting until the solid content is 35%, and then cooling and discharging. With the adoption of the preparation method disclosed by the invention, the problem of discharge for volatile organic compounds is solved; and the obtained product is good in water resistance after being dried, and improved in hardness, glossiness and plasticity after film-forming.