Sealing agents, methods of making and uses thereof

Patent metadata

Field	Value
Publication number	US-10259946-B1
Application number	US-201715470646-A
Country	US
Kind code	B1
Filing date	Mar 27, 2017
Priority date	Mar 25, 2016
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

Embodiments of the present disclosure relate generally to coating compositions which are suitable for use as sealing agents, methods of making and uses thereof. The disclosed coating compositions may be particularly suitable for application as a sealing agent to a burnished surface of a cementitious substrate, such as the cut face of a fiber cement board.

First claim

What is claimed is:

1. A coating composition suitable for use as a sealing agent for a cementitious substrate, comprising:
water;
5-40% wt. of an alkali metal dihydrogen phosphate, wherein the alkali metal dihydrogen phosphate is dissolved in the water to form an acidic aqueous solution comprising dihydrogen phosphate and alkali metal ions;
a water-based dye composition, said water-based dye composition is dispersed in the acidic aqueous solution, wherein the % wt. ratio of the water-based dye composition to the alkali metal dihydrogen phosphate is between 0.01 and 0.5; and
wherein the pH value of the coating composition is maintained at a level lower than 7 such that the composition provides sufficient hydrogen ions to neutralize one or more functional groups on a surface of the cementitious substrate.

2. The composition of claim 1 , wherein the alkali metal dihydrogen phosphate is sodium dihydrogen phosphate.

3. The composition of claim 1 , wherein the pH value of the coating composition is between 3.0 and 5.0.

4. The composition of claim 1 , wherein the dye composition comprises water and one or more water soluble dye molecules that are stable in an acidic solution.

5. The composition of claim 4 , wherein the one or more dye molecules comprises disodium 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo] 2-naphthalene sulfonate, and 2-(6-hydroxy-2,4,5,7-tetraiodo-3-oxo-xanthen-9-yl)benzoic acid.

6. The composition of claim 1 , wherein the dye composition comprises water, disodium 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo] 2-naphthalene sulfonate, 2-(6-hydroxy-2,4,5,7-tetraiodo-3-oxo-xanthen-9-yl)benzoic acid, propylene glycol, and paraben.

7. The composition of claim 4 , wherein the one or more dye molecules are about 1 to about 50 mg/mL of the dye composition.

Assignees

• Hardie James Technology Ltd

Inventors

• Peng Weiling

Classifications

• C04B41/67

  Phosphates · CPC title

• C04B2111/00482

  Coating or impregnation materials · CPC title

• C09D7/63

  organic · CPC title

• C09D1/02

  alkali metal silicates · CPC title

• C04B41/5092

  Phosphate cements · CPC title