| 摘要 |
<p>The novel stabilised-viscosity adhesive agent and mortar additive with improved shelf life contains 92.0 M% or more, related to the total composition, of water, amorphous, finely divided silicon dioxide and at least one organic polymer dispersions with silicon dioxide and polymer dispersion together making +/- 6.0 M% of the mass of water, and 4.0 M% or less, related to the total composition, of non-ionic wetting agents and dispersion auxiliaries. It is important here that the adhesive agent and mortar additive contain: amorphous, finely divided silicon dioxide with 92.0 M% SiO2 or more; as a stabilising additive either a bentonite swellable with cold water and based on magnesium silicate, a finely divided silica with a high specific area mixed with aluminium oxide in the ratio of 4:1 to 8:1 or an aluminium oxide of high specific area with an Al2O3 content of 96.0 M% or more in proportions of 0.2 to 0.4 M% related to the total composition; and as an additional dispersing additive one based on formaldehyde naphthaline sulphonic acid condensates in proportions of 0.05 to 0.1 M% (solids) related to the total composition, dissolved in water. The steps in the process for making said adhesive agent and mortar additive are: the addition and dispersion of the amorphous, finely divided silicon dioxide in the formaldehyde naphthaline sulphonic acid condensate/water mixture before or after the addition of the stabilising additive; then mixing in the organic polymer dispersion followed by the additives; adjusting to a steady final viscosity of 200 to 900 mPa.s, which also improves shelf life.</p> |
