COMPOUND FLUORINE-FREE FOAM EXTINGUISHING AGENT AND PREPARATION METHOD THEREFOR

Abstract

The present invention discloses a compound fluorine-free foam extinguishing agent and a preparation method therefor, comprising components of the following parts by weight: 6-8 parts of alkyl glycoside, 10-14 parts of polysiloxane quaternary ammonium salt, 0.5-1 part of silicon dioxide and 60-65 parts of water. The compound fluorine-free foam extinguishing agent prepared by the present invention has a high stability, a high expansion, an obvious fire extinguishing effect and a higher environment-friendliness. The polysiloxane quaternary ammonium salt contains hydrophobic polysiloxane long chains, has a high temperature resistance, and collaborates with the alkyl glycoside to be adsorbed on the surface of silicon dioxide particles, which improves the stability of the silicon dioxide in a solution and reduces the surface tension of the solution. The preparation method of the present invention is reasonable; by controlling the temperature and adjusting the stirring time of each component, the alkyl glycoside, the polysiloxane quaternary ammonium salt and silicon dioxide nanoparticles are fully and evenly mixed. In addition, the materials are cheap, and the resultants are safe to the environment, therefore, the present invention is a fluorine-free foam extinguishing agent with low cost and high environment-friendliness.

Claims

1. A compound fluorine-free foam extinguishing agent, comprising components of the following parts by weight: 6-8 parts of alkyl glycoside, 10-14 parts of polysiloxane quaternary ammonium salt, 0.5-1 part of silicon dioxide and 60-65 parts of water.

2. The compound fluorine-free foam extinguishing agent according to claim 1, wherein the agent comprises the components of the following parts by weight: 6 parts of alkyl glycoside, 10 parts of polysiloxane quaternary ammonium salt, 0.5 parts of silicon dioxide and 60 parts of water.

3. A preparation method for the compound fluorine-free foam extinguishing agent according to claim 1, comprising the following steps: S1. adding the water to a blender and controlling the temperature at 23 C.-25 C.; S2. slowly adding the alkyl glycoside and the polysiloxane quaternary ammonium salt into the blender in sequence, stirring the mixture, maintaining the temperature at 23 C.-25 C., and evenly mixing the alkyl glycoside and the polysiloxane quaternary ammonium salt to obtain a mixed solution; S3. stopping stirring, maintaining the temperature at 23 C.-25 C., and letting the mixed solution obtained in step S2 stand for 20-30 min; S4. maintaining the temperature at 23 C.-25 C., adding the silicon dioxide into the mixed solution after standing in step S3, and stirring the mixture for 20-30 min at a stirring rate of 800 rpm to obtain a final solution; S5. stopping stirring, controlling the temperature at 23 C.-25 C., and letting the final solution obtained in step S4 to stand and form a transparent, uniform and stable compound fluorine-free foam extinguishing agent.

4. The preparation method for the compound fluorine-free foam extinguishing agent according to claim 3, wherein in step S2, the stirring time is 0.5-1.5 h, and the stirring rate is 800 rpm.

Description

DETAILED DESCRIPTION

[0019] The present invention is described below in detail in combination with the drawings and specific embodiments:

Embodiment 1

[0020] A compound fluorine-free foam extinguishing agent, comprising components of the following parts by weight: 6 parts of alkyl glycoside, 10 parts of polysiloxane quaternary ammonium salt, 0.5 parts of silicon dioxide and 60 parts of water.

[0021] A preparation method therefor, comprising the following steps: [0022] S1. Adding the 60 parts of water to a blender and controlling the temperature at 23 C.-25 C.; [0023] S2. Slowly adding the 6 parts of alkyl glycoside and the 10 parts of polysiloxane quaternary ammonium salt into the blender in sequence, stirring the mixture for 1 h at a stirring rate of 800 rpm, and evenly mixing the alkyl glycoside and the polysiloxane quaternary ammonium salt to obtain a mixed solution; [0024] S3. Stopping stirring, maintaining the temperature at 23 C.-25 C., and letting the mixed solution obtained in step S2 stand for 20 min; [0025] S4. Maintaining the temperature at 23 C.-25 C., adding the 0.5 parts of silicon dioxide into the mixed solution after standing in step S3, and stirring the mixture for 20 min at a stirring rate of 800 rpm to obtain a final solution; [0026] S5. Stopping stirring, controlling the temperature at 23 C.-25 C., and letting the final solution obtained in step S4 to stand and form a transparent, uniform and stable compound fluorine-free foam extinguishing agent.

Embodiment 2

[0027] A compound fluorine-free foam extinguishing agent, comprising components of the following parts by weight: 8 parts of alkyl glycoside, 14 parts of polysiloxane quaternary ammonium salt, 1 part of silicon dioxide and 65 parts of water.

[0028] A preparation method therefor, comprising the following steps: [0029] S1. Adding the 65 parts of water to a blender and controlling the temperature at 23 C.-25 C.; [0030] S2. Slowly adding the 8 parts of alkyl glycoside and the 14 parts of polysiloxane quaternary ammonium salt into the blender in sequence, stirring the mixture for 1 h at a stirring rate of 800 rpm, and evenly mixing the alkyl glycoside and the polysiloxane quaternary ammonium salt to obtain a mixed solution; [0031] S3. Stopping stirring, maintaining the temperature at 23 C.-25 C., and letting the mixed solution obtained in step S2 stand for 30 min; [0032] S4. Maintaining the temperature at 23 C.-25 C., adding the 1 part of silicon dioxide into the mixed solution after standing in step S3, and stirring the mixture for 30 min at a stirring rate of 800 rpm to obtain a final solution; [0033] S5. Stopping stirring, controlling the temperature at 23 C.-25 C., and letting the final solution obtained in step S4 to stand and form a transparent, uniform and stable compound fluorine-free foam extinguishing agent.

Embodiment 3

[0034] A compound fluorine-free foam extinguishing agent, comprising components of the following parts by weight: 7 parts of alkyl glycoside, 12 parts of polysiloxane quaternary ammonium salt, 0.75 parts of silicon dioxide and 63 parts of water.

[0035] A preparation method therefor, comprising the following steps: [0036] S1. Adding the 63 parts of water to a blender and controlling the temperature at 23 C.-25 C.; [0037] S2. Slowly adding the 7 parts of alkyl glycoside and the 12 parts of polysiloxane quaternary ammonium salt into the blender in sequence, stirring the mixture for 0.5 h at a stirring rate of 800 rpm, and evenly mixing the alkyl glycoside and the polysiloxane quaternary ammonium salt to obtain a mixed solution; [0038] S3. Stopping stirring, maintaining the temperature at 23 C.-25 C., and letting the mixed solution obtained in step S2 stand for 25 min; [0039] S4. Maintaining the temperature at 23 C.-25 C., adding the 0.75 parts of silicon dioxide into the mixed solution after standing in step S3, and stirring the mixture for 25 min at a stirring rate of 800 rpm to obtain a final solution; [0040] S5. Stopping stirring, controlling the temperature at 23 C.-25 C., and letting the final solution obtained in step S4 to stand and form a transparent, uniform and stable compound fluorine-free foam extinguishing agent.

Embodiment 4

[0041] The compound fluorine-free foam extinguishing agents prepared in embodiment 1 and embodiment 2 are diluted by 100 times respectively, and a foam extinguishing device with the function of producing foam by gradually expanding and swirling is used to carry out a fire extinguishing experiment. The size of the fire scene is 400 cm200 cm100 cm. A comparison of expansion, foam drainage time and fire extinguishing time is made among the agents prepared in the present invention and a commercially available aqueous film forming foam extinguishing agent, and the experimental results are shown in Table 1:

TABLE-US-00001 TABLE 1 Comparison of expansion, foam drainage time and fire extinguishing time among three extinguishing agents Source of extinguishing 25% drainage Fire extinguishing agent Expansion time (min) time (min) Embodiment 1 7 8.5 3.5 Embodiment 2 7.5 7 4 Commercially available 6 4.5 5 extinguishing agent

[0042] The fire extinguishing mechanism is: the organosilicon surfactant in a compound foaming agent has a good spreadability, which can reduce the surface tension of a solution and make a foam have an excellent spreadability; in the process of fire extinguishing, the foam of the compound foaming agent spreads rapidly on the surface of a fuel, thus to isolate the contact between the fuel and a comburant. The foam of the compound foaming agent with a high temperature resistance is not easy to burst, and has a strong inhibition effect on fuel vapor; with the increase of temperature, after an upper layer of foam bursts, silicon dioxide nanoparticles in a liquid film precipitate to cover the surface of a lower layer of foam, and gradually accumulate to form a solid covering layer; the nanoparticle covering layer reduces the damage effect of thermal radiation on the lower layer of foam and reduces the heat burst speed of the foam, thus improving the fire extinguishing performance of the foam.

[0043] Compared with the existing fire extinguishing foam, the compound fluorine-free foam extinguishing agent prepared by the present invention has a high stability, a high expansion, an obvious fire extinguishing effect and a higher environment-friendliness. The polysiloxane quaternary ammonium salt used in the fluorine-free foam extinguishing agent contains hydrophobic polysiloxane long chains, has a high temperature resistance, and collaborates with the alkyl glycoside to be adsorbed on the surface of silicon dioxide particles, which improves the stability of the silicon dioxide in a solution and reduces the surface tension of the solution. The preparation method of the present invention is reasonable; by controlling the temperature and adjusting the stirring time of each component, the alkyl glycoside, the polysiloxane quaternary ammonium salt and silicon dioxide nanoparticles are fully and evenly mixed, which avoids the experimental error caused by uneven mixing. In addition, the materials are cheap, and the resultants are safe to the environment, therefore, the present invention is a fluorine-free foam extinguishing agent with low cost and high environment-friendliness.

[0044] The above only describes preferred embodiments of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and the principle of the present invention shall be contained within the protection scope of the present invention.