摘要:
Mixtures comprising (A) at least one hydraulic or latently hydraulic binder, (B) at least one copolymer obtainable by reacting (α1) at least one ethylenically unsaturated comonomer having at least one functional group selected from COOH groups, sulfonic acid groups, nitrile groups, hydroxyalkyl groups and amino groups, or (α2) at least one (co)polymer of at least one ethylenically unsaturated comonomer having at least one functional group selected from COOH groups, sulfonic acid groups, nitrile groups, hydroxyalkyl groups and amino groups, with (β) at least one oligomeric or polymeric compound obtainable by reacting (a) at least one ethylenically unsaturated di- or polycarboxylic acid or anhydride or ester thereof with (b) at least one at least trifunctional alcohol and (c) at least one compound of the general formula I in which the variables are each defined as follows: R1 is selected from C1-C4-alkyl and hydrogen, A is the same or different and is selected from C2-C6-alkylene, n is in the range from 4 to 40, and (d) optionally at least one further compound having at least one COOH group or at least one alcoholic OH group per molecule.
摘要:
The invention relates to a process for the production of water-soluble or water-swellable polymers having a low content of residual monomers, particularly on the basis of acrylic acid and/or acrylamide and at least one additional water-soluble comonomer, in which process a monomer solution in a polymerizing state is treated with electromagnetic radiation at the earliest after reaching the maximum temperature of polymerization, and the gel obtained is subsequently crushed and dried, and it also relates to the water-soluble or water-swellable polymers as such, which can be obtained according to said process, to their use in the hygiene industry, packaging industry, in the agrarian technology or in agriculture and horticulture, in the cable industry and information technology, in the food industry, papermaking industry, and to their use as flocculation aids and as drilling fluid in petroleum production.
摘要:
Mixtures comprising (A) at least one hydraulic or latently hydraulic binder, (B) at least one copolymer obtainable by reacting (α1) at least one ethylenically unsaturated comonomer having at least one functional group selected from COOH groups, sulfonic acid groups, nitrile groups, hydroxyalkyl groups and amino groups, or (α2) at least one (co)polymer of at least one ethylenically unsaturated comonomer having at least one functional group selected from COOH groups, sulfonic acid groups, nitrile groups, hydroxyalkyl groups and amino groups, with (β) at least one oligomeric or polymeric compound obtainable by reacting (a) at least one ethylenically unsaturated di- or polycarboxylic acid or anhydride or ester thereof with (b) at least one at least trifunctional alcohol and (c) at least one compound of the general formula I in which the variables are each defined as follows:R1 is selected from C1-C4-alkyl and hydrogen,A is the same or different and is selected from C2-C6-alkylene,n is in the range from 4 to 40, and (d) optionally at least one further compound having at least one COOH group or at least one alcoholic OH group per molecule.
摘要:
The invention relates to powdery, water-soluble cationic polymers containing at least two chemically different composed cationic polymers. A first cationic polymer is formed in the presence of a second cationic polymer from the monomer constituents in an aqueous solution according to the aqueous gel polymerisation method. The invention also relates to the use of said products in solid/liquid separation.
摘要:
The invention relates to polymer-modified cement-containing building material dry mixes which contain a redispersible polymer powder, water retention agents based on polysaccharide structures, a calcium-containing setting accelerator and a superabsorbent copolymer.
摘要:
A process is proposed for blocking underground formations in the extraction of fossil oil and/or gas, a first step involving introducing water-absorbing particles into liquid-bearing and porous rock formations, said particles being water-swellable, crosslinked and water-insoluble polymers, said particles in the water-bearing rock formation finally preventing liquid flow through the rock layers by water absorption. This process is characterized in that the absorbing particles comprise a superabsorbent polymer with anionic and/or cationic properties and a retarded swelling action. This process, which can also be carried out in saline formation waters, is notable in that the swelling of the superabsorbents used begins no earlier than after five minutes and in that the superabsorbents are obtainable by four proposed process variants and any combination thereof. This process, which does not need a carrier liquid, is notable for its simplicity and especially the controllable retardation of the swelling action under the specific conditions of underground rock formations.
摘要:
The invention relates to powdery, water-soluble cationic polymer compositions comprising at least two cationic polymer compositions comprising at least two cationic polymers having a different molecular weight. A first cationic polymer is formed in the presence of a second cationic polymer from monomer constituents in an aqueous solution according to the aqueous gel polymerization method. The invention also relates to the use of products in solid/liquid separation.
摘要:
A dry mortar mixture based on at least one hydraulic and/or latently hydraulic binder which in the made-up and not yet cured state has firm properties is claimed. The novel dry mortar mixture is characterized in that it contains at least one representative of a dispersant and at least one compound having superabsorbent properties. This mixture makes it possible to carry over the advantages of known tile adhesives for horizontal application to vertical application possibilities.
摘要:
The present invention relates to heat storage compositions comprising 70 to 99% by weight of calcium chloride hexahydrate 1 to 10% by weight of one or more cationic polyelectrolytes and 0 to 20% by weight of one or more further salts, based in each case on the heat storage composition, to a process for production thereof, to the use thereof as a latent heat storage material and use of the latter in heat-storing building materials and as a heat storage element for vehicles, walls of transport vessels or other heat storage vessels.
摘要:
A dry mortar mixture based on at least one hydraulic and/or latently hydraulic binder which in the made-up and not yet cured state has firm properties is claimed. The novel dry mortar mixture is characterized in that it contains at least one representative of a dispersant and at least one compound having superabsorbent properties. This mixture makes it possible to carry over the advantages of known tile adhesives for horizontal application to vertical application possibilities.