Pyrotechnical, aerosol-forming composition for extinguishing fires and process for its preparation

• US 6,264,772 B1
• Filed: 04/20/1999
• Issued: 07/24/2001
• Est. Priority Date: 07/30/1998
• Status: Expired due to Term

• Current Assignee: R-Amtech International Inc.
• Original Assignee: R-Amtech International Inc.
• Inventors: Drakin, Nikolay Vasiljevich
• Primary Examiner(s): Jordan, Charles T.
• Assistant Examiner(s): FELTON, AILEEN BAKER
• Application Number:
  US09/294,716
• Time in Patent Office: 826 Days
• Field of Search: 149/21, 149/110, 149/61, 149/19.1, 149/19.92, 169/46, 169/47, 252/3, 252/5, 264/3.1, 264/3.4
• US Class Current: 149/19.92
• CPC Class Codes: A61D 1/06 Castrating appliances
• CPC Class Codes: A62C 5/006 Extinguishants produced by combustion
• CPC Class Codes: A62C 99/0018 using gases or vapours that do not support combustion, e.g. steam, carbon dioxide

Abstract

The invention relates to fire-extinguishing technology, in particular a process for producing aerosol-forming pyrotechnical compositions for extinguishing fires. The process includes the steps of mixing powdery combustible binder, oxidizing agent and dicyandiamide. The combustible binder is a polycondensate of formaldehyde and a organic compound, of a fraction from 70 to 120 μm. The oxidizing agent is an alkali nitrate of a fraction from 15 to 25 μm. The dicyandiamide is a fraction from 40 to 80 μm. Subsequently, there is added to the above, respective fractions of the combustible binder of 10 to 25 μm of the oxidizing agent of 1 to 7 μm and of the dicyandiamide of 7 to 15 μm. The weight ratios of the fractions of combustible binder, oxidizing agent and dicyandiamide are 70:30, 25:75 and 80:20. The resulting mixture is molded while the content of the components is 9 to 20 weight percent dicyandiamide, 6 to 14 weight percent combustible binder, and the balance weight percent oxidizing agent.

Claims

1. A process for the preparation of a pyrotechnical, aerosol-forming composition for extinguishing fires, comprising the steps of mixing powdery combustible binder, which is a polycondensate of formaldehyde and an organic compound, of a fraction from 70 to 120 μ

m and an oxidizing agent, which is an alkali nitrate, of a fraction from 15 to 25 μ

m and dicyandiamide of a fraction from 40 to 80 μ

m, subsequently adding respective fractions of said ingredients of 10 to 25 μ

m, 1 to 7 μ

m and 7 to 15 μ

m, the weight ratios of the fractions of combustible binder, oxidizing agent and dicyandiamide being 70;

30, 25;

75 and 80;

20, and molding the mixture while the content of the components is as follows, in % by weight;

dicyandiamide 9 to 20

combustible binder 6 to 14

oxidizing agent the balance.

3. The process for preparing a pyrotechnical, aerosol forming composition according to claim 1 wherein the combustible binder is a polycondensate of formaldehyde and melamine or carbamide.

5. The process for preparing a pyrotechnical, aerosol-forming composition according to claim 1, wherein the combustible binder is polycondensate of formaldehyde and phenol.

7. The process for preparing a pyrotechnical, aerosol-forming composition according to claim 1, wherein prior to the step of mixing, potassium chromate or potassium dichromate or ammonium dichromate is applied in an amount of 1.0 to 3.5% by weight from an aqueous solution onto the surface of the oxidizing agent of the fraction from 1 to 7 μ

m, and subsequently dried until constant weight is reached.

9. The process for preparing a pyrotechnical, aerosol-forming composition according to claim 1, wherein prior to the step of mixing, graphite is applied in an amount of 0.2 to 0.5% by weight onto the surface of the oxidizing agent of the fraction from 15 to 25 μ

m.

2. A process for the preparation of a pyrotechnical, aerosol-forming composition for extinguishing fires, comprising the steps of dissolving in an organic solvent a 70 to 120 μ

m fraction and thereafter a 10 to 25 μ

m fraction of a combustible binder, which is a polycondensate of formaldehyde and an organic compound, dispersing in the obtained solution an oxidizing agent, which is an alkali nitrate, of a fraction from 15 to 25 μ

m and dicyandiamide of a fraction from 40 to 80 μ

m and subsequently respective fractions of said ingredients of from 1 to 7 μ

m and from 7 to 15 μ

m, the weight ratio of the fractions of dicyandiamide and the oxidizing agent being 80;

20 and 25;

75, respectively, drying, granulating with drying, and molding the mixture while the content of the components is as follows, in % by weight;

dicyandiamide 9 to 20

combustible 6 to 14

oxidizing agent the balance.

4. The process for preparing a pyrotechnical, aerosol forming composition according to claim 2, wherein the combustible binder is a polycondensate of formaldehyde and melamine or carbamide.

6. The process for preparing a pyrotechnical, aerosol-forming composition according to claim 2, wherein the combustible binder is polycondensate of formaldehyde and phenol.

8. The process for preparing a pyrotechnical, aerosol-forming composition according to claim 2, wherein prior to the step of mixing, potassium chromate or potassium dichromate or ammonium dichromate is applied in an amount of 1.0 to 3.5% by weight from an aqueous solution onto the surface of the oxidizing agent of the fraction from 1 to 7 μ

m, and subsequently dried until constant weight is reached.

10. The process for preparing a pyrotechnical, aerosol-forming composition according to claim 2, wherein prior to the step of mixing, graphite is applied in an amount of 0.2 to 0.5% by weight onto the surface of the oxidizing agent of the fraction from 15 to 25 μ

m.