摘要:
The present invention relates to an additive for hydraulically setting compositions, comprising a colloidally disperse preparation of at least one salt of a mono- or polyvalent metal cation and of at least one compound which is able to release an anion which forms a low-solubility salt with the metal cation, and of at least one polymeric sulphonated dispersant. The additive is suitable particularly as a slump retainer.
摘要:
Proposed is the use of a composition based on polyvinyl alcohol (component a) ) as a water-retention agent in mixtures comprising hydraulic binding agents, the component comprising a sulfonated ketone formaldehyde condensation product as a further component with a preferred mixing ratio of 1:1. The component a) may comprise, depending on the respective hydrolysis degree, polyvinyl acetate parts or parts of other polyvinyl esters as well as polymers in general, which can be converted into polyvinyl alcohol by hydrolysis, up to 90 wt.%. Said new composition is used as a water-retention agent in mixtures comprising hydraulic binding agents, and particularly in connection with the exploitation of underground crude oil and natural gas deposits.
摘要:
Pulverulent polycondensation products are described, comprising a) from 5 to 95% by weight of a polycondensation product based on an aromatic or heteroaromatic compound (A) having from 5 to 10 carbon atoms or heteroatoms having at least one oxyethylene or oxypropylene radical and an aldehyde (C) selected from the group of formaldehyde, glyoxylic acid and benzaldehyde or mixtures thereof, and b) from 5 to 95% by weight of a finely divided mineral support material having a specific surface area of from 0.5 to 500 m2/g (according to BET to DIN 66 131). The inventive pulverulent polycondensation products are outstandingly suitable in building material mixtures in an amount of from 0.1 to 5% by weight, based on the weight of the building material. The pulverulent polycondensation products have a number of advantages in this context, for example excellent storage stability, good liquefying action at low dosage and technically simple production.
摘要:
The invention concerns a method for inerting clays in sand intended for preparing hydraulic compositions, comprising a step which consists in adding to the composition or one of its constituents a cationic polymer having a cationic charge density more than 0.5 meq/g and an intrinsic viscosity less than 1 dg/l.
摘要:
The present invention provides universal well cement additives and methods. The universal well cement additives improve the properties of a well cement slurry and can be comprised of iron chloride, a dispersing agent, an organic acid, a hydratable polymer and an ultra-fine particulate hydraulic cement.
摘要:
L'invention concerne une composition de revêtement de protection thermique du type ablatif comportant deux constituants A et B présentés en conditionnements séparés et destinés à être mélangés avant mise en oeuvre de façon classique, par simple malaxage mécanique à température ambiante, caractérisée en ce que ces deux constituants contiennent les éléments suivants :
constituant A sous forme liquide:
de 20 à 95% massique d'un polymère halogéné sous forme d'une émulsion aqueuse (I), de 5 à 80% massique d'un polymère du type silicone sous forme d'une émulsion aqueuse (II), de 0 à 5% massique de microfibres organiques ou minérales
constituant B sous forme solide :
de 30 à 90% massique d'un liant hydraulique en poudre à haute résistance de type classique, de 0 à 30% massique de fibres de verre ou de fils de verre coupés disponibles commercialement, de 0,5 à 15% massique de microsphères creuses de céramique ou de verre disponibles commercialement, de 0,1 à 20% massique d'oxyde de zinc sous forme pulvérulente, le ratio entre A et B étant de 1 partie en masse de A pour 0,5 à 2 parties en masse de B.
摘要:
Compositions comprising a finely divided material such as a cellulosic material and an amount of a latex containing magnesium oxychloride and/or magnesium oxysulphate effective to impart water and fire resistance to the material are disclosed. Methods to make a water and fire resistant product are also disclosed.