Cement-based powdered water-repellent composition, and its applications

• US 4,229,225 A
• Filed: 07/20/1979
• Issued: 10/21/1980
• Est. Priority Date: 08/03/1978
• Status: Expired due to Term

• Current Assignee: Jean J. Damiguet, Richard Kraszewski
• Original Assignee: Jean J. Damiguet, Richard Kraszewski
• Inventors: Kraszewski, Richard, Damiguet, Jean J.
• Primary Examiner(s): Poer, James
• Application Number:
  US06/059,155
• Time in Patent Office: 459 Days
• Field of Search: 106/99
• US Class Current: 106/643
• CPC Class Codes: C04B 14/00 Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone expanding or defibrillating materials C04B20/00
• CPC Class Codes: C04B 14/46 Rock wool ; Ceramic or silicate fibres C04B14/40, C04B14/42 take precedence
• CPC Class Codes: C04B 14/4643 Silicates other than zircon
• CPC Class Codes: C04B 16/00 Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
• CPC Class Codes: C04B 2111/00482 Coating or impregnation materials
• CPC Class Codes: C04B 2111/2023 Resistance against alkali-aggregate reaction
• CPC Class Codes: C04B 22/00 Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators , shrinkage compensating agents
• CPC Class Codes: C04B 24/00 Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: F24S 70/16 made of ceramic; made of concrete; made of natural stone
• CPC Class Codes: Y02E 10/40 Solar thermal energy, e.g. solar towers

Abstract

This invention relates to a cement-based powdered water-repellent composition, comprising, expressed as dry weight:

(a) 20-60% of a cement,

(b) 30-70% of an inorganic or organic filler,

(c) 2-10% of a fibre selected from zirconium, hafnium, vanadium and cesium silicate fibres,

(d) 0.2-1% of plasticizers for cement,

(e) 1-3% of an adhesive,

(f) 0.1-0.5% of a water-repellent.

This composition is useful for the production of coatings and molded products, having very high mechanical strength and water-repellent properties.

This composition may additionally contain 0.1-2% alkalinity-reducing buffer salts.

Claims

1. Cement-based powdered water-repellent composition, comprising, expressed as dry weight:

(a) 20-60% of a cement,

(b) 30-70% of an inorganic or organic filler,

(c) 2-10% of a fibre selected from zirconium, hafnium, vanadium and cesium silicate fibres,

(d) 0.2-1% of plasticizers for cement,

(e) 1-3% of an adhesive,

(f) 0.1-0.5% of a water-repellent.

2. Composition as claimed in claim 1, additionally comprising 0.1-2% of alkalinity-reducing buffer salts.

3. Composition as claimed in claim 2, wherein said buffer salts are selected from phosphates and borax.

4. Composition as claimed in claim 1, wherein the inorganic filler is selected from silica and alumina fillers, carbonates, sulfates and metal filings, and the organic filler is selected from natural and synthetic plastic materials, in powdered form having a particle size of 1μ

to 10 mm.

5. Composition as claimed in claim 1, wherein the silicate fibres have a diameter of up to 10 mm and a length of 0.3 mm to 20 cm.

6. Composition as claimed in claim 1, wherein the plasticizer is selected from natural limestone, an alkyl-aryl sulfonate and a lignosulfite.

7. Composition as claimed in claim 1, wherein the adhesive is selected from vinylic and acrylic polymers, copolymers and terpolymers, styrene-butadiene adhesives, epoxy resins and natural adhesives selected from gelatin, casein, starch derivatives and cellulose derivatives.

8. Composition as claimed in claim 1, wherein the water-repellent agent is selected from zinc, magnesium, sodium and potassium stearates and oleates, powdered silicones, and diatomites.

9. Composition as claimed in claim 1, comprising additionally, per 100 parts by weight of the composition of claim 1, 1-20 parts by weight of a coloring agent, 0.1-0.5 parts by weight of an air-removing agent, 0.1-0.5 parts by weight of a water-retaining agent.

10. Process for the preparation of a cement-based powdered water-repellent composition, comprising, expressed as dry weight:

(a) 20-60% of a cement,

(b) 30-70% of an inorganic or organic filler,

(c) 2-10% of a fibre selected from zirconium, hafnium, vanadium and cesium silicate fibres,

(d) 0.2-1% of plasticizers for cement,

(e) 1-3% of an adhesive,

(f) 0.1-0.5% of a water-repellent,

comprising first mixing the silicate fibres, optionally together with the buffer salts and the adhesive, then adding the water-repellent agent, and then adding to the resulting mixture the cement and the plasticizer previously dispersed in the filler.

11. Coating or molded product, prepared with a cement-based powdered water-repellent composition, comprising, expressed as dry weight:

(a) 20-60% of a cement,

(b) 30-70% of an inorganic or organic filler,

(c) 2-10% of a fibre selected from zirconium, hafnium, vanadium and cesium silicate fibres,

(d) 0.2-1% of plasticizers for cement,

(e) 1-3% of an adhesive,

(f) 0.1-0.5% of a water-repellent,

diluted with 10-40 wt% water with respect to its weight, and then applied to a substrate or a mold by any suitable means.

12. Member for collecting solar energy, comprising a cured cement-based powdered water-repellent composition, comprising, expressed as dry weight:

(a) 20-60% of a cement,

(b) 30-70% of an inorganic or organic filler,

(c) 2-10% of a fibre selected from zirconium, hafnium, vanadium and cesium silicate fibres,

(d) 0.2-1% of plasticizers for cement,

(e) 1-3% of an adhesive,

(f) 0.1-0.5% of a water-repellent,

in which are provided channels for the flow of a heat-carrying fluid.