Coating composition exhibiting reduced block, rapid dry rate an related methods
View Patent ↗An emulsion composition to coat a substrate that includes a barrier-forming material, water; an organometallic compound, and at least one thickener is described. The composition may further include a material such as talc. Articles, including ductile pipes, coated with this material are also described. A method of increasing the drying rate of a composition applied to a substrate to form a coating that includes application of the emulsion composition and drying the composition to form a coating layer. Also included are methods of forming a coating that exhibits a reduced incidence of blocking or pull-off, comprising applying the emulsion composition to a substrate and drying, whereby the coating layer formed exhibits a reduced incidence of blocking or pull off relative to conventional asphalt emulsion coatings.
1. An emulsion composition to coat a substrate comprising:
a. a barrier-forming material that is an asphalt,
b. water,
c. an organometallic compound, and
d. at least one thickener,
wherein, upon application of the composition to a substrate a coating is formed and the coating is substantially dry within the lapse of about 60 to about 1800 seconds from initial application.
2. The composition according to claim 1 further comprising a material chosen from talc and precipitated silica.
3. The composition according to claim 1 , wherein the asphalt has a pen grade of about 1 to about 70.
4. The composition according to claim 1 , wherein the asphalt has a pen grade of about 10 to about 50.
5. The composition according to claim 1 , wherein the organometallic compound is chosen from an organotitanate, a di-alkoxy acyl titanate, a tri-alkoxy acyl titanate, a alkoxy triacyl titanate, and an alkoxy titanate.
6. The composition according to claim 1 , wherein the organometallic compound comprises neoalkoxy titanate.
7. The composition according to claim 1 , wherein the thickener comprises a modifier chosen from a smectite clay (synthetic or natural), laponite, saponite, nontronite, and montmorillonite.
8. The composition according to claim 1 , further comprising a surfactant.
9. The composition according to claim 1 , wherein the surfactant comprises a defoaming agent.
10. The composition according to claim 1 , further comprising at least one pH modifier.
11. The composition according to claim 1 , wherein the barrier-forming material is present in the composition in an amount of about 25% to about 50% by weight of the total composition.
12. The composition according to claim 1 , wherein the organometallic compound is present in the composition in an amount of about 0.05% to about 0.02% by weight of the total composition.
13. A coating layer that is formed by a process comprising providing the emulsion composition of claim 1 to a substrate and drying the composition.
14. A coated article comprising the coating layer of claim 13 .
15. A coated pipe comprising a pipe having an interior surface and an exterior surface wherein at least one of the surfaces is coated with a coating that comprises the coating layer of claim 13 .