Additive building material mixtures containing nonionic emulsifiers

Abstract

The present invention relates to the use of polymeric microparticles containing nonionic emulsifiers in hydraulically setting building material mixtures for the purpose of enhancing their frost resistance and cyclical freeze/thaw durability.

Description

Claims

1. Use of polymeric microparticles, containing a void, in hydraulically setting building material mixtures, characterized in that the microparticles are stabilized by nonionic emulsifiers.

2. Use of polymeric microparticles, containing a void, according to claim 1, characterized in that the hydrophilic group of the nonionic emulsifiers used belongs to the alcohols, amine oxides or (oligo)oxyalkylenes or mixtures thereof.

3. Use of polymeric microparticles, containing a void, according to claim 2, characterized in that the nonionic emulsifiers are used in amounts of <5% by weight, based on the polymer content of the microparticles used.

4. Use of polymeric microparticles, containing a void, according to claim 2, characterized in that the nonionic emulsifiers are used in amounts of <3% by weight, based on the polymer content of the microparticles used.

5. Use of polymeric microparticles, containing a void, according to claim 2, characterized in that the nonionic emulsifiers are used in amounts of <1% by weight, based on the polymer content of the microparticles used.

6. Use of polymeric microparticles, containing a void, according to claim 1, characterized in that the microparticles are composed of polymer particles which contain a polymer core (A), swollen by means of an aqueous base and based on an unsaturated carboxylic acid (derivative) monomer, and a polymer envelope (B), based on a nonionic, ethylenically unsaturated monomer.

7. Use of polymeric microparticles, containing a void, according to claim 6, characterized in that the unsaturated carboxylic acid (derivative) monomers are selected from the group of acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and crotonic acid.

8. Use of polymeric microparticles, containing a void, according to claim 6, characterized in that the nonionic, ethylenically unsaturated monomers are composed of styrene, butadiene, vinyltoluene, ethylene, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile, acrylamide, methacrylamide, C1-C12 alkyl esters of acrylic or methacrylic acid.

9. Use of polymeric microparticles, containing a void, according to claim 1, characterized in that the microparticles have a polymer content of 2% to 98% by weight.

10. Use of polymeric microparticles, containing a void, according to claim 1, characterized in that the microparticles possess an average particle size of 100 to 5000 nm.

11. Use of polymeric microparticles, containing a void, according to claim 1, characterized in that the microparticles possess an average particle size of 200 to 2000 nm.

12. Use of polymeric microparticles, containing a void, according to claim 1, characterized in that the microparticles possess an average particle size of 250 to 1000 nm.

13. Use of polymeric microparticles, containing a void, according to claim 1, characterized in that the microparticles are used in an amount of 0.01% to 5% by volume, based on the building material mixture.

14. Use of polymeric microparticles, containing a void, according to claim 1, characterized in that the microparticles are used in an amount of 0.1% to 0.5% by volume, based on the building material mixture.

15. Use of polymeric microparticles, containing a void, according to claim 1, characterized in that the building material mixtures are composed of a binder selected from the group of cement, lime, gypsum and anhydrite.

16. Use of polymeric microparticles, containing a void, according to claim 1, characterized in that the building material mixtures are concrete or mortar.