Compositions: coating or plastic – Coating or plastic compositions – Coating repellent
Patent
1996-09-20
1998-07-21
Bonner, Melissa
Compositions: coating or plastic
Coating or plastic compositions
Coating repellent
1062871, 10628714, 106490, 427387, 4273936, 427352, 427354, C04B 4164
Patent
active
057829616
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for the protective treatment of mineral structures, particularly concrete structures. The invention also relates to a composition and the use of the composition when carrying out the method in the treatment of mineral constructions, particularly structures that are comprised of fine-porous material such as high grade concrete, to protect the mineral material from damage, and also possible embedded reinforcement material in the concrete.
BACKGROUND OF THE INVENTION AND CONVENTIONAL ART
Many present-day structures built from mineral materials are subjected to the influence of chloride and water to such an intensity that the structures are unable to serve their intended life span.
It is known that hydrophobizing substances applied to mineral surfaces will reduce the harmful effect of the environment thereon and that the sensitive outer layers of such surfaces will obtain favourable moisture conditions relatively quickly after having been made hydrophobic. (C. f. Folke Karlsson, "Moisture reduction and impregnation", The NACE Annual Conference and Corrosion Show, Corrosion 93, Paper No. 340/10-340/12).
Several different types of hydrophobizing preparations having different properties and compositions for protecting concrete structures against the effect of moisture have been proposed in the art: EP 101 816, EP 273 867, EP 385 108, EP 518 324, SE 404 358 mention different examples of silanes for this purpose. EP 49 365 teaches the use of alkyl silanoles produced from hydrolyzed alkyltrialkoxy silanes.
EP 304 497 mentions siloxanes for this purpose. EP 157 323 and EP 362 084 describe substances which are designated silicone resins. Other compounds and substances are described in EP 186 265, EP 284 085 and SE 419 748. At least the majority of these substances can also be used when carrying out the present invention.
EP 101 816, in particular, describes the use of solvent-free alkyltrialkoxy silanes whose alkyl groups have 3-8 carbon atoms and whose alkoxy groups have 1-2 carbon atoms. It has been found that the solvents proposed in several of the aforesaid patent specifications, both water-insoluble and polar solvents, are disadvantageous. Many solvents are harmful to the health and to the environment. They also heavily dilute the active substance and reduce its protective effect achieved at each treatment occasion while unnecessarily increasing treatment costs.
At present, compounds which render surfaces hydrophobic, ie hydrophobizing substances, are brushed or sprayed onto the surfaces, after having previously cleaned the surfaces with hot water under pressure. When the protective substance is sprayed onto the surfaces to be treated, a large part of the substance is lost by splashing.
In order to achieve a long term protective effect and produce favourable moisture conditions in the outer surfaces of the structure treated, it is necessary for the substance to penetrate deeply into the structure. The amount of protective substance that can be absorbed by the material and the depth to which the substance penetrates decreases markedly with increasing moisture contents of the material. Furthermore, the depth to which a protective substance will penetrate into finely-porous material, such as high-grade concrete, is also greatly limited and, above all, uneven, wherein the protective effect afforded in some surface sections will be poor and will have only a short effective life. Finely-porous concrete structures require the application of large quantities of hydrophobizing substance in order to achieve effective protection at depth. Suction of the substance into the pores of the structure by capillary forces takes place very slowly.
The depth to which the protective substance penetrates can be increased by increasing the amount of substance applied and/or the time in which the substance is in contact with the treated material. One problem in this regard is that it is only possible to apply a thin layer of substance when using a brush or a spray. Because of the long capillar
REFERENCES:
patent: 3905823 (1975-09-01), Piskoti
patent: 4076868 (1978-02-01), Roth et al.
patent: 4352894 (1982-10-01), Schmidt
patent: 4431452 (1984-02-01), Comper et al.
patent: 4631207 (1986-12-01), Price
patent: 4648904 (1987-03-01), DePasquale et al.
patent: 4716051 (1987-12-01), Rodder
patent: 4717599 (1988-01-01), Merrill
patent: 4804573 (1989-02-01), McCarthy et al.
patent: 4940743 (1990-07-01), Grape et al.
patent: 4999249 (1991-03-01), Deschler et al.
patent: 5021262 (1991-06-01), Bouillard et al.
patent: 5250106 (1993-10-01), Roth et al.
patent: 5292908 (1994-03-01), Onikata et al.
patent: 5421865 (1995-06-01), Grulke et al.
Folke Karlsson: "Moisture Reduction and Impregnation," The NACE Annual Conference and Corrosion Show, Corrosion 93, Paper No. 350/10-340/12, 7-12 Mar. 1993.
Abstract of EP-177824.
LandOfFree
Method for the protective treatment of mineral material structur does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for the protective treatment of mineral material structur, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the protective treatment of mineral material structur will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1643145