The present invention relates to a modified starch and a preparation method therefor and an application thereof. The modified starch is mainly prepared from starch and a cationic starch complexing agent; The chemical structure of the cationic starch complexing agent consists of the following components: i) one or more hydrophobic groups, wherein at least one hydrophobic group is capable of reacting with starch to form an inclusion complex, and ii) one or more hydrophilic groups, wherein at least one hydrophilic group is a cationic hydrophilic group. The hydrophobic group and the hydrophilic group are respectively at both ends of the same molecular structure and are connected by means of a chemical bond to form an asymmetric and polar structure. The use of the modified starch in papermaking can greatly increase the adsorption rate of starch on the surface of the fiber or in the pulp, thereby increasing the retention rate of the starch in the paper, improving the strength of the paper and reducing or even eliminating the loss of starch in the pulping and papermaking process and further reducing COD emissions.
A composition controlling deposition of an organic contaminant during pulp and paper making. Active ingredients thereof comprise: 1) a bio-enzyme having a perhydrolysis function; and ii) hydrogen peroxide and/or a precursor enabling generation of hydrogen peroxide. The part-by-weight ratio of i) to ii) in the composition is 1 : 0.1-200. Also provided is a paper making method in which the composition is added to a paper-making fiber slurry to control deposition of an organic contaminant.
Provided are a system and method for obtaining an image of granular sticky materials (410, 420) in a papermaking pulp, belonging to the technical field of pulping and papermaking. The system comprises a transparent adsorption test piece (200) allowing the transmission of visible light, the adsorption test piece (200) having an adsorption surface and being used for adsorbing the granular sticky materials (410, 420) in the papermaking pulp flowing through the adsorption test piece (200); and an image collection device comprising an image collector (310) and a background platform (320), wherein the image collector (310) is used for collecting the image of the above-mentioned adsorption test piece (200), the background platform (320) is used for cooperating with the adsorption test piece (200), the background platform (320) comprises at least two coloured background faces (329), and the at least two background faces (329) can be mutually converted. By the cooperation of the transparent adsorption test piece (200) and the image collection device with the background faces (329) that can be mutually converted, the precision and the sensitivity of the sticky material monitoring can be improved, and more comprehensive and accurate sticky material image data can be provided for a subsequent sticky material analysis.
Provided is a method for monitoring the distribution condition of sticky materials (410, 420) in a pulping and papermaking system, belonging to the technical field of pulping and papermaking. The method comprises the following steps: sampling: allowing the papermaking pulp at a pre-determined sampling point in the pulping and papermaking system to flow through an adsorption test piece (200) having a surface capable of adsorbing granular sticky materials (410, 420) and have an adsorption reaction with the adsorption test piece (200) so as to adsorb the granular sticky materials (410, 420) in the papermaking pulp onto the surface of the adsorption test piece (200), wherein the adsorption test piece (200) is made of a transparent material allowing the transmission of visible light; and detection: acquiring images of the above-mentioned adsorption test piece (200) under the condition of at least two pre-determined background colours; and analysing various properties of particles in each of the images, and calculating the content of the granular sticky materials (410, 420) at the sampling point so that the distribution condition of the sticky materials (410, 420) in the pulping and papermaking system is obtained. By using the above-mentioned method, the sticky materials (410, 420) of various colours in the pulping and papermaking system can be determined, the monitoring precision and sensitivity of the sticky materials (410, 420) are improved; moreover, the distribution condition of the sticky materials (410, 420) in the whole system can be provided.
A device for capturing sticky materials in a pulping and papermaking system, comprising a reaction vessel comprising an accommodating cavity (110) for accommodating a papermaking pulp; and an absorption test piece (200) having an absorption surface and used for adsorbing granular sticky materials in a papermaking pulp flowing through the absorption test piece, the absorption surface of the absorption test piece (200) being located inside the accommodating cavity (110). A method using the device comprises allowing a papermaking pulp at a pre-determined sampling point in the pulping and papermaking system to flow through the surface of the absorption test piece and have an adsorption reaction with the absorption test piece so that granular sticky materials in the papermaking pulp are adsorbed to the surface of the absorption test piece. The capturing device uses the reaction vessel to provide support for the absorption test piece and can withstand the impact of the flow of the papermaking pulp in every direction.
A method for reducing and removing organic pollutant deposits and ink during pulp and paper production, said method comprising adding polystyrene phenol polyoxyethylene/propylene/butylene ether or sulphate, phosphate and carboxylic ester polymers having a molecular weight of 240-7000 to aqueous cellulose papermaking slurry, said polymers comprising at least one polymer represented by formula I. Wherein: R1 is selected from: hydrogen or C 1-4 alkyl; R2, R3, and R4 are selected from: hydrogen, methyl, ethyl, propyl or phenyl, and the substituents of adjacent R2 and R3 and R3 and R4 are from different radical groups; m is selected from: an integer between 0-70; n is selected from: an integer between 1-80; p is selected from: an integer between 0-30, and if one of R2 or R3 is selected from phenyl, then the corresponding p value is zero; z is selected from: an integer between 1-3; X is selected from: hydrogen, R5OOH, a sulfuric acid group, a phosphoric acid group, acrylic acid, maleic acid, or fumaric acid, or a soluble salt of any one of R5OOH, a sulfuric acid group, a phosphoric acid group, acrylic acid, maleic acid, or fumaric acid; and R5 is selected from C 1-4 alkyl.
Disclosed in the present invention is a polystyrene phenol polyoxy alkyl polymer and a preparation method and application thereof, relating to the technical field of pulping and papermaking. The polystyrene phenol polyoxy alkyl polymer is a polystyrene phenol polyoxyethylene/propylene/butylene ether or sulphate, phosphate and carboxylic ester polymers having a molecular weight of 240-7000; adding the polymer to aqueous cellulose papermaking slurry such that same has a surface reaction with organic pollutants or ink matter which changes the physical and chemical properties of the organic pollutants or ink, such that this matter is more easily separated and removed during the pulping process; the amount of organic pollutants and ink in the system is reduced, whilst the viscosity of organic pollutants is simultaneously changed and even eliminated; organic pollutant deposits during the pulping and papermaking process are thereby eliminated, achieving the objectives of improving paper quality and increasing papermaking productivity.
Provided are a fiber oxidase composition used for altering and improving the whiteness of a paper, a papermaking method, and applications of the composition. The fiber oxidase composition comprises the following components: an enzyme component having an oxidation function for a fiber, where the enzyme component is a fiber oxidase that alters the surface properties of the fiber by means of a redox reaction; and, an auxiliary component having increased catalytic activities for the fiber oxidase, where the auxiliary component is a scavenger for a reaction product of the fiber oxidase, and the weight ratio of the enzyme component to the auxiliary component is 1:0.1-50.
C12N 9/26 - Hydrolases (3.) agissant sur les composés glycosyliques (3.2) agissant sur les liaisons alpha-glucosidiques-1, 4, p. ex. hyaluronidase, invertase, amylase
C12N 9/24 - Hydrolases (3.) agissant sur les composés glycosyliques (3.2)
C12N 9/18 - Hydrolases agissant sur les esters d'acides carboxyliques
C12N 9/16 - Hydrolases (3.) agissant sur les liaisons esters (3.1)
C12N 9/08 - Oxydoréductases (1.), p. ex. luciférase agissant sur le peroxyde d'hydrogène comme accepteur (1.11)
C12N 9/04 - Oxydoréductases (1.), p. ex. luciférase agissant sur des groupes CHOH comme donneurs, p. ex. oxydase de glucose, déshydrogénase lactique (1.1)
C12N 9/02 - Oxydoréductases (1.), p. ex. luciférase
D21H 17/00 - Matériaux non fibreux ajoutés à la pâte caractérisés par leur constitutionMatériaux d'imprégnation du papier caractérisés par leur constitution
D21H 21/10 - Agents de rétention ou produits améliorant l'égouttage
9.
FIBER OXIDASE COMPOSITION USED FOR ALTERING AND IMPROVING WHITENESS OF PAPER, PAPERMAKING METHOD, AND APPLICATIONS OF THE COMPOSITION
Provided are a fiber oxidase composition used for altering and improving the whiteness of a paper, a papermaking method, and applications of the composition. The fiber oxidase composition consists primarily of the following components: an enzyme component having an oxidation function for a fiber, where the enzyme component is a fiber oxidase that alters the surface properties of the fiber by means of a redox reaction; and, an auxiliary component having increased catalytic activities for the fiber oxidase, where the auxiliary component is a protein having catalytic effects for the fiber oxidase, and the weight ratio of the enzyme component to the auxiliary component is 1:0.4-50.
C12N 9/26 - Hydrolases (3.) agissant sur les composés glycosyliques (3.2) agissant sur les liaisons alpha-glucosidiques-1, 4, p. ex. hyaluronidase, invertase, amylase
C12N 9/24 - Hydrolases (3.) agissant sur les composés glycosyliques (3.2)
C12N 9/18 - Hydrolases agissant sur les esters d'acides carboxyliques
C12N 9/16 - Hydrolases (3.) agissant sur les liaisons esters (3.1)
C12N 9/08 - Oxydoréductases (1.), p. ex. luciférase agissant sur le peroxyde d'hydrogène comme accepteur (1.11)
C12N 9/04 - Oxydoréductases (1.), p. ex. luciférase agissant sur des groupes CHOH comme donneurs, p. ex. oxydase de glucose, déshydrogénase lactique (1.1)
C12N 9/02 - Oxydoréductases (1.), p. ex. luciférase
D21H 17/00 - Matériaux non fibreux ajoutés à la pâte caractérisés par leur constitutionMatériaux d'imprégnation du papier caractérisés par leur constitution
10.
FIBER OXIDASE COMPOSITION USED FOR IMPROVING WHITENESS OF PAPER, PAPERMAKING METHOD, AND APPLICATIONS OF THE COMPOSITION
Provided are a fiber oxidase composition used for improving the whiteness of a paper, a papermaking method, and applications of the composition. The fiber oxidase composition consists primarily of the following components: an enzyme component having an oxidation function for a fiber, where the enzyme component is a fiber oxidase that improves the surface properties of the fiber by means of a redox reaction; and, an auxiliary component having increased catalytic activities for the fiber oxidase, where the auxiliary component is a reaction substrate for the fiber oxidase. Also provided is a method for using the composition in papermaking.
C12N 9/02 - Oxydoréductases (1.), p. ex. luciférase
D21H 17/00 - Matériaux non fibreux ajoutés à la pâte caractérisés par leur constitutionMatériaux d'imprégnation du papier caractérisés par leur constitution
D21H 21/30 - Substances luminescentes ou fluorescentes, p. ex. pour blanchiment optique
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