Paint dispersion
View Patent ↗The invention relates to a method of providing an aqueous paint dispersion comprising silanized colloidal silica particles and an acrylate-based binder wherein the weight ratio of SiO 2 to acrylate-based binder on a dry basis ranges from 0.02 to 0.2, and wherein the content of SiO 2 , measured by XRF, in said dispersion ranges from 1.05 to 7.5 wt %, wherein silane groups present in the silanized colloidal silica particles are derived from silanes containing an epoxy group, glycidoxy group, glycidoxypropyl group, ureido-based silanes, methacrylamido silanes, mercapto silanes, and combinations thereof. The invention also relates to the use thereof.
1. Aqueous paint dispersion comprising silanized colloidal silica particles, an acrylate-based binder, and polysiloxane;
wherein the weight ratio of SiO 2 to acrylate-based binder on a dry basis ranges from 0.02 to 0.2;
wherein the content of SiO 2 , measured by XRF, in said dispersion ranges from 1.05 to 7.5 wt %;
wherein silane groups present in the silanized colloidal silica particles are derived from silanes containing an epoxy group, glycidoxy group, glycidoxypropyl group, ureido-based silanes, methacrylamido silanes, mercapto silanes, and combinations thereof;
wherein the polysiloxane is present in an amount of 0.05 to 2 wt %; and
wherein the colloidal silica particles are prepared by polymerization of polysilicic acid originating from water glass.
2. The dispersion of claim 1 wherein the dispersion remains stable for at least 12 months at a temperature from 15 to 25° C.
3. The dispersion of claim 1 , wherein the SiO 2 content in the dispersion ranges from 1.3 to 5 wt %.
4. The dispersion of claim 3 , wherein the SiO 2 content in the dispersion ranges from 1.3 to 4.5 wt %.
5. The dispersion of claim 4 , wherein the SiO 2 content in the dispersion ranges from 2 to 3 wt %.
6. The dispersion of claim 1 , wherein the total dry content in the dispersion ranges from 45 to 75 wt %.
7. The dispersion of claim 1 , wherein the silane group of the silanized colloidal silica particles is derived from an epoxy silane.
8. The dispersion of claim 6 , wherein the total dry content in the dispersion ranges from 50 to 65 wt %.
9. The dispersion of claim 1 , wherein the content of SiO 2 is measured by XRF using a Philips Magix PW2424 spectrometer.
10. A method for painting of bricks, minerals, wood, metal surfaces, plastics, ceramics, cementitious materials, glass, or porcelain comprising the step of applying the paint dispersion of claim 1 to bricks, minerals, wood, metal surfaces, plastics, ceramics, cementitious materials, glass, or porcelain.
11. Method of preparing an aqueous paint dispersion comprising mixing silanized colloidal silica particles, an acrylate-based binder and a polysiloxane;
wherein the weight ratio of SiO 2 to acrylate-based binder on a dry basis ranges from 0.02 to 0.2;
wherein silanized colloidal silica particles is mixed in such amount that the content of SiO 2 , measured by XRF, in said dispersion ranges from 1.05 to 7.5 wt %;
wherein silane groups present in the silanized colloidal silica particles are derived from silanes containing an epoxy group, glycidoxy group, glycidoxypropyl group, ureido-based silanes, methacrylamido silanes, mercapto silanes, and combinations thereof;
wherein the polysiloxane is present in an amount of 0.05 to 2 wt %; and
wherein the colloidal silica particles are prepared by polymerization of polysilicic acid originating from water glass.
12. The method of claim 11 , wherein the SiO 2 content in the dispersion ranges from 1.3 to 5 wt %.
13. The method of claim 11 , wherein the total dry content of the dispersion ranges from 45 to 75 wt %.
14. The method of claim 11 , wherein the silane groups present in the silanized colloidal silica particles are derived from silanes containing an epoxy group.