JPH0435673A - Manufacture of foamy fire extinguishing agent using egg shells - Google Patents

Abstract

PURPOSE:To improve the adhesive property, the thermal stability, and the like, by utilizing egg shells obtained by reacting egg shells made into minute powder with an adequate amount of acid or acid salt. CONSTITUTION:Protein attached to the recovered egg shells is washed with water and removed, and dried by the sun light or by heating. The resultant egg shells are powdered minutely less than about 100 meshes by using a ball mill and the like. The smaller the particle diameter the better. Then, by adding a single or a mixture solution of an adequate amount of acid or an acid sale to the egg shell powder, foams of several dozens times the adding solution are generated. And a metal salt such as iron chloride is added to the solution to maintain a fire-proof property so as to obtain a form source solution. As a result, the adhesive property, the thermal stability, and the like can be improved.

Description

Detailed Description of the Invention "Industrial Application Field" This invention is a foam fire extinguishing agent that uses eggshell obtained by reacting finely powdered eggshell with an appropriate amount of inorganic acid, organic acid, or acid salts. This relates to a manufacturing method. The term "eggshell" here refers to an eggshell with collagen attached to it.

``Conventional technology'' Conventionally, eggshells as waste have been used in the confectionery manufacturing industry by simply pulverizing them as a calcium source, or as raw materials for cosmetics to collect collagen. Only.

``Problems to be Solved by the Invention'' Eggshells have a limited range of use as a food additive as a calcium source and as a raw material for cosmetics using the collagen contained therein. The present invention solves the above-mentioned drawbacks and takes advantage of all the characteristics of the main ingredients of eggshells, such as Lucium carbonate, collagen, and amino acids, and adds various inorganic acids such as hydrochloric acid, sulfuric acid, and fine powder to these fine powders. When reacting nitric acid, phosphoric acid, organic acids such as acetic acid, lactic acid, citric acid, or acidic salts such as aluminum sulfate, stable and suffocating bubbles containing carbon dioxide are generated, which is several tens of times the amount of the original solution. It is intended to expand its use as a fire extinguishing foam that utilizes its fire extinguishing effect. Eggshells form highly stable chemical bubbles due to the effects of calcium carbonate, which generates carbon dioxide, collagen, which is firmly attached to it even when it is made into a fine powder, and trace amounts of amino acids within the shell. Because it has ingredients that satisfy the requirements for a fire extinguishing foam in terms of adhesion, thermal stability, fluidity, blast stability, and cohesiveness, it is possible to add a foaming agent or foam stabilizer to the product in addition to conventional foaming agents and foam stabilizers. This is not necessary compared to those prepared using traditional methods, and it is an excellent raw material for fire extinguishing foam.

"Means for Solving the Problem" Add an appropriate amount of an inorganic acid such as phosphoric acid, an organic acid such as lactic acid, or an acidic salt such as aluminum sulfate to eggshells that have been finely ground to about 100 mesh or less, and then This is a method for producing a fire extinguishing foam using eggshells, which consists of the above production method and generates stable suffocating bubbles containing carbon.

[Function] Currently, ordinary fire extinguishing foams are mainly composed of sodium hydrogen carbonate and sodium carbonate as carbon dioxide generating agents, casein, gelatin, saponin, etc. as foam stabilizers, and sulfuric acid. Most products that add acidic salts such as aluminum and generate suffocating bubbles are the most common.The product of this invention has all the components contained in eggshells that have the functions necessary for fire extinguishing foam. For example, the calcium carbonate that forms the shell acts as a carbon dioxide generator, the attached collagen maintains air bubble sealing and cohesive properties, and the collagen-like amino acid component that has entered the shell maintains its adhesive properties. This contributes to stability, etc.

"Example" The present invention will be explained below.

1st step: Proteins attached to the collected eggshells are thoroughly washed with water to remove them, dried under the sun or heated, and then finely ground to approximately 100 meshes or less using a ball mill or the like. The smaller the particle size, the better.

Second step: By adding an appropriate amount of a single or mixed solution of acids or acidic salts to the eggshell fine powder that has passed through the second step, bubbles several tens of times larger than the added solution are generated. The amount of bubbles generated under standard conditions is 50-65% of the theoretical amount; for example, when 1.5 mol of Elagshell and 1.0 mol of phosphoric acid are used, the actual amount of bubbles generated is 21%. δ liters. Moreover, the reaction proceeds smoothly even at a temperature of about 5°C.

To preserve the fire resistance of the above solution, Add metal salts such as iron chloride to Make the foam stock solution.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are examples of results showing the significance of the present invention. The horizontal axis in Figure 1 is the mmol amount of eggshell used for each 22.5 mmol of acid or acidic salt, and the vertical axis is the amount of air bubbles generated in cm'' under standard conditions. Third step Figure 2 The horizontal axis shows the time in minutes for bubbles to disappear when 22.5 mmol of each acid or acidic salt is added to 25 m m O1 of eggshell, and the vertical axis shows the time in minutes for bubbles to disappear under standard conditions. Air bubble generation cm”
It is quantity. In either case, the bubbles remained almost completely stable for about 20 minutes. Symbols in Figures 1 and 2, 1 is lactic acid, 2 is phosphoric acid,
3 is aluminum sulfate.

Claims (1)

[Claims] 1. A method for producing fire extinguishing foam using eggshell obtained by reacting an appropriate amount of acids or acidic salts with finely powdered eggshell