摘要:
La présente invention concerne un procédé de classification de matière minérale mettant en oeuvre un additif d'aide à la classification comprenant du glycérol et / ou au moins un poly-glycérol permettant d'augmenter l'efficacité de classification à air ou impliquant une énergie de classification spécifique réduite par rapport à une classification à air sans additif, tout en obtenant une matière minérale classifiée, compatible avec une application en milieu aqueux. Elle concerne également l'utilisation du produit ainsi obtenu, en peinture, en plastique, en application alimentaire à destination humaine ou animale, en formulation pharmaceutique, en masse papetière ou en couchage papetier.
摘要:
The invention relates to the use, in a hydraulic binder-based composition, of a calcium carbonate characterized in that it is obtained by dry-grinding, and in that it is dry-ground in the presence of a grinding aid agent that is a (meth)acrylic acid copolymer with a monomer carrying an alkoxy or hydroxy polyalkylene glycol function. The invention also concerns the hydraulic binder-based compositions thus obtained.
摘要:
The invention relates to the use of at least on polymer containing at least one monomer selected from acrylic acid or methacrylic acid or mixtures thereof and at least one monomer which is the maleic anhydride as a dispersing and/or grinding aid agent in a fabrication process of a dispersion and/or an aqueous suspension of mineral materials, wherein the molar ratio r (acrylic acid and/or methacrylic acid : (maleic anhydride) is strictly confined to the range between 2:1 and 0.1 : 1. Another object of the invention consists in the aqueous dispersions and suspensions of mineral materials thus produced and the use thereof in the fabrication of plastics, paper and paintworks.
摘要:
A first objective of the present invention is a method for dry milling material which contains carbonate ore, characterized in that the said method comprises the following steps: a) dry milling of the said material in at least one milling unit: (i) in the presence of at least one polyalkylene glycol polymer where at least 90% but preferably 95% at least, and very preferably 98% at least of the monomer units forming the backbone of the said polymer are constituted by ethylene oxide, propylene oxide or their mixtures, and where the molecular weight is at least equal to 400 g/mole, (ii) such that the quantity of water in the said milling unit is less than 10% in dry weight of the said material in the said milling unit; b) the milled material may then be classified according to step a) with at least one classification unit; c) the steps a) and/or b) may be repeated with all or part of the milled material from step a) and/or step b). Another aim of the present invention is a product coming from step a) and/or b) and/or c) of the method of the invention. A third object of the present invention is the use of the said product from step a) and/or b) and/or c) for making sealant, paper, paint, plastic or else for formula used in agriculture.
摘要:
The invention relates to the use of comb polymers which comprise a carbon backbone comprising polyether groups of formula A *-U-(C(O))k-X-(Alk-O)n-W A wherein * is the binding point on the carbon backbone of the comb polymer, U represents a chemical binding or an alkylene group having 1 - 8 C-atoms, X represents oxygen or a group NR, k is 0 or 1, n represents a whole number, wherein the average, in relation to the comb polymer, lies in the region of between 5 - 300, Alk represents C2-C4-alkylene, Alk in the group (Alk-O)n can be identical or different, W represents hydrogen, a C1-C6-alkyl- or a aryl radical or the group Y-Z, Y represents a linear or cross-linked alkylene group having 2 - 8 C-atoms and which can support a phenyl ring, Z represents a 5 10-membered nitrogen heterocycle which is linked by nitrogen, and the ring members, in addition to nitrogen atoms and carbon atoms, are 1, 2 or 3 additional heteroatoms which are selected from oxygen, nitrogen and sulphur, whereby the nitrogen ring members can comprises a R' group, and 1 or 2 carbon ring members can be a carbonyl group, R represents hydrogen, C1-C4-alkyl or benzyl, and R' represents hydrogen, C1-C4-alkyl or benzyl. The invention also relates to functional B groups which are in the form of anionic groups when pH >12, and to the salts thereof as grinding agents in preparations containing cement.
摘要:
L'invention concerne l'utilisation d'un copolymère faiblement anionique et hydrosoluble, comme agent d'aide au broyage de pigments et/ou charges minérales en suspension aqueuse donnant d'une part un faible potentiel Zéta aux suspensions aqueuses desdites charges et/ou pigments et d'autre part apportant une stabilisation électro-stérique desdites suspensions. L'invention concerne également lesdites suspensions aqueuses de pigments et/ou charges minérales et leurs utilisations dans les domaines du papier, comme la fabrication ou le couchage du papier, des boues de forage mises en oeuvre pour la prospection ou l'extraction pétrolière. L'invention concerne aussi l'utilisation desdits agents d'aide au broyage dans les domaines des peintures et des matières plastiques comme les résines thermoplastiques ou thermodurcissables.
摘要:
The invention relates to the use of polyacrylic acids which contain organic terminal groups containing sulphur, comprising at least two carbon atoms, having an average molecular weight Mw of 5 000 - 30 000 g/mol and which are at least partially neutralised by a base which is selected from the group of alkali hydroxides and ammonia as auxiliary agents for wet grinding of calcium carbonate. The invention also relates to fine particle aqueous suspensions of calcium carbonate which are produced by wet grinding of calcium carbonate in the presence of said polyacrylic acids.
摘要:
A method for grinding silicon metalloid is claimed herein comprising grinding silicon metalloid in the presence of an effective amount of a grinding aid selected from groups consisting of carboxylic acids having at least 8 carbon atoms, alkali metal salts of carboxylic acids having at least 8 carbon atoms and polydiorganosiloxanes.
摘要:
Agent de mouture pour ciments, caractérisé en ce qu'il est constitué essentiellement de dérivés de sirops de sucres obtenus par oxydation et hydrogénats desdits sirops de sucre.