Preparation method of active fire extinguishing silica gel material and active fire extinguishing silica gel material

Abstract

A method for preparing an active fire-extinguishing silica gel material and the active fire-extinguishing silica gel material. During preparation, a low-temperature solidified liquid two-component silica gel is used, and fire-extinguishing microcapsules are added to silica gel A and silica gel B respectively, and then stirred separately. After stirring separately, silica gel A and silica gel B are mixed and stirred to obtain a fire-extinguishing microcapsule silica gel mixture, which is then pressed and stretched. The pressed and stretched fire-extinguishing microcapsule silica gel mixture is vulcanized in a first temperature box, the length of the first temperature box being at least 15 meters. The fire-extinguishing microcapsule silica gel is transported in the first temperature box by a conveyor belt. During the transportation process, the temperature is gradually increased from at least 25°C to a maximum of 75°C. After preliminary vulcanization, it is transported to a second temperature box for constant temperature and time vulcanization to obtain a finished product. The method can solve the problem that fire-extinguishing microcapsules are easily broken during the vulcanization process of silica gel preparation, realize the combination of fire-extinguishing microcapsules and silica gel, and obtain a silica gel material with active fire extinguishing function.

Description

Technical Field

[0001] The present invention relates to the technical field of fire extinguishing materials, in particular to a preparation method of an active fire extinguishing silica gel material and the active fire extinguishing silica gel material. Background Art

[0002] Fire-extinguishing microcapsules solidify liquid fire extinguishing agents, encapsulating them within micro- and nano-capsules. When exposed to high temperatures and open flames, the encapsulated materials rupture, releasing the extinguishing gas, enabling repeated fire extinguishing. These microcapsules offer superior fire-extinguishing performance compared to liquid fire extinguishing agents, are more convenient, and are easy to store. The development of a diverse product line is inevitable.

[0003] Using molds to create various shapes requires a lot of manpower and time, making it difficult to promote and implement them across multiple fields. However, if silicone products are made, their flexibility can be leveraged to cut them into various shapes suitable for installation and protection on a variety of equipment, effectively reducing costs and increasing efficiency.

[0004] However, due to the high-temperature rupture characteristics of fire-extinguishing microcapsules, they are easily broken during the vulcanization process of silica gel. Conventional methods cannot produce silica gel materials containing fire-extinguishing microcapsules. Therefore, how to combine fire-extinguishing microcapsules with silica gel is the technical problem to be solved by this invention. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a preparation method of an active fire extinguishing silica gel material and an active fire extinguishing silica gel material. The method can solve the problem that the fire extinguishing microcapsules are easily broken during the vulcanization process of silica gel preparation, realize the combination of fire extinguishing microcapsules and silica gel, and obtain a silica gel material with active fire extinguishing function.

[0006] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: providing a method for preparing an active fire extinguishing silica gel material, comprising the following steps:

[0007] 1) Using low-temperature curing liquid two-component silicone, the liquid two-component silicone includes silicone A and silicone B, and adding fire extinguishing microcapsules to silicone A and silicone B respectively;

[0008] 2) Stir silica gel A and silica gel B with fire extinguishing microcapsules added separately;

[0009] 3) Mixing and stirring the separately stirred silica gel A and silica gel B to form a fire extinguishing microcapsule silica gel mixture;

[0010] 4) Pressing and extending the fire extinguishing microcapsule silica gel mixture;

[0011] 5) The pressed and stretched fire extinguishing microcapsule silica gel mixture is vulcanized in a first temperature box, the length of the first temperature box is at least 15 meters, and the fire extinguishing microcapsule silica gel is transported in the first temperature box by a conveyor belt, and the temperature is gradually increased from at least 25° C. to a maximum of 75° C. during the transportation process;

[0012] 6) After the fire extinguishing microcapsule silica gel mixture is initially vulcanized in the first temperature chamber, it is transported to the second temperature chamber for constant temperature and time vulcanization, and the active fire extinguishing silica gel material is obtained after vulcanization in the second temperature chamber.

[0013] As a further improvement of the present invention, in step 1), the ratio of silica gel A to silica gel B is 1:1; the weight of the fire extinguishing microcapsules added to silica gel A is 5-10% of the weight of silica gel A; and the weight of the fire extinguishing microcapsules added to silica gel B is 5-10% of the weight of silica gel B.

[0014] As a further improvement of the present invention, in step 1), before adding the fire extinguishing microcapsules to silica gel A and silica gel B respectively, silicone oil is first added to the fire extinguishing microcapsules.

[0015] As a further improvement of the present invention, in step 2), the silica gel A and silica gel B to which the fire extinguishing microcapsules are added are stirred separately by a high-speed disperser; the stirring speed does not exceed 80 rpm.

[0016] As a further improvement of the present invention, in step 3), the silica gel A and silica gel B after being stirred separately are mixed and stirred in a mixer; the temperature of the mixed and stirred fire-extinguishing microcapsule silica gel mixture is controlled to be 25-30° C. when it is output.

[0017] As a further improvement of the present invention, in step 3), the temperature control is achieved by controlling the stirring speed and setting a cooling device, or either one of them, wherein the stirring speed is controlled to 80 to 120 rpm, and the cooling device uses a flowing liquid refrigerant to remove heat.

[0018] As a further improvement of the present invention, in step 4), before pressing and stretching, the fire extinguishing microcapsule silica gel mixture is attached to a carrier, and the carrier is made of fireproof cloth or release film; the fire extinguishing microcapsule silica gel mixture is pressed and stretched using a calender, and the roller temperature of the calender is 25-35°C.

[0019] As a further improvement of the present invention, in step 5), a 20-meter first incubator is used, and the temperature change of the first incubator is set along its length direction, and is set to 35°C, 40°C, 45°C, 50°C, 55°C, and 60°C in sequence, and the conveying speed of the conveyor belt is 1 m / min.

[0020] As a further improvement of the present invention, in step 6), before the fire extinguishing microcapsule silica gel mixture is transported to the second incubator for vulcanization, the fire extinguishing microcapsule silica gel mixture is first rolled up, and then transported to the second incubator for vulcanization after rolling up; the temperature of the second incubator is controlled at 50-60°C, and the vulcanization time is controlled at 2-3 hours.

[0021] The present invention also provides an active fire extinguishing silica gel material, which is prepared by the above preparation method.

[0022] The present invention has the following beneficial effects: the method utilizes low-temperature curing liquid two-component silicone. During the initial vulcanization of the liquid two-component silicone, a first temperature chamber of sufficient length is employed, and the temperature is gradually increased to perfectly match the length and temperature of the first temperature chamber. The silicone is vulcanized without rupturing the fire-extinguishing microcapsules, and the fire-extinguishing microcapsules and the silicone are fully bonded together, thereby obtaining a silicone material with active fire extinguishing function. The active fire extinguishing silicone material can be easily cut into various shapes for installation on different equipment for protection, facilitating widespread promotion and application in multiple fields. Furthermore, the preparation of the silicone material does not require repeated mold opening, resulting in low production costs and high efficiency, making it suitable for industrial large-scale mass production. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to specific embodiments.

[0024] Example 1:

[0025] A method for preparing an active fire extinguishing silica gel material, comprising the following steps:

[0026] 1) Use a low-temperature curing, two-component liquid silicone rubber (addition-type), comprising silicone A and silicone B in a 1:1 ratio. Silicone oil is added to the fire-extinguishing microcapsules, which are then added to silicone A and silicone B, respectively. The weight of the fire-extinguishing microcapsules added to silicone A is 5% of the weight of silicone A, and the weight of the fire-extinguishing microcapsules added to silicone B is 5% of the weight of silicone B. The silicone oil prevents the fire-extinguishing microcapsules from sticking to the machine during the subsequent mixing step, allowing them to fully integrate into the silicone. The amount of silicone oil used is also part of the silicone A / Silicone ratio.

[0027] 2) Silica gel A and silica gel B with the fire extinguishing microcapsules added thereto are stirred separately by a high-speed disperser; the stirring speed does not exceed 80 rpm.

[0028] 3) The separately stirred silica gel A and silica gel B are mixed and stirred in a mixer to fully mix the silica gels A and B. During the mixing process, a gas-liquid homogeneous system is formed. The shearing effect makes the mixing uniform, thereby obtaining a fire-extinguishing microcapsule silica gel mixture. The temperature of the mixed and stirred fire-extinguishing microcapsule silica gel mixture is controlled at 25°C when it is output to ensure that the vulcanization reaction and dehydrogenation reaction of the silica gel are synchronized and balanced. Temperature control is achieved by controlling the stirring speed and setting a cooling device, wherein the stirring speed is controlled to 80 rpm. The lower the speed, the less heat is generated. The increase in speed converts mechanical energy into thermal energy, which will instantly destroy the integrity and airtightness of the fire-extinguishing microcapsules and is not easily detected. At the same time, a cooling device is used to cool the mixture, and the cooling device uses a flowing liquid refrigerant to remove heat.

[0029] 4) The fire extinguishing microcapsule silica gel mixture is attached to a carrier. The carrier is made of a flexible, shearable material that is fireproof and high temperature resistant. In this embodiment, glass fiber fireproof cloth is selected. The fire extinguishing microcapsule silica gel mixture can be coated and attached to one or both sides of the glass fiber fireproof cloth. In addition to attaching the fire extinguishing microcapsule silica gel mixture, the carrier also plays a major role in transportation. The glass fiber fireproof cloth with the fire extinguishing microcapsule silica gel mixture is transported to a calender for pressing and stretching. The calender uses a three-roll calender. The three-roll calender is more suitable for materials with a thickness of 2 to 3 mm. The roller temperature is controlled at 25°C. Using this roller temperature can make the viscosity of the silica gel low, the calendering fluidity good, the shrinkage rate of the semi-finished product low, and the surface smooth. If the roller temperature is too high, bubbles and scorching are likely to occur, or the fire extinguishing microcapsules may rupture; if the roller temperature is too low, the fluidity of the rubber compound will be reduced, the surface of the semi-finished product will be rough, and the shrinkage rate will increase. The thickness of the silicone rubber should leave enough space for expansion. In this embodiment, the required material thickness is 2 mm, so the gap between the rollers for calendering should be about 1.8 mm before entering the first temperature box for vulcanization.

[0030] 5) The pressed and stretched fire-extinguishing microcapsule silica gel mixture is vulcanized in a first incubator. The first incubator is 20 meters long, and the fire-extinguishing microcapsule silica gel is transported in this incubator via a conveyor belt. During transportation, the temperature gradually increases from 35°C to 60°C. Specifically, the temperature of the first incubator is set along its length, successively set to 35°C, 40°C, 45°C, 50°C, 55°C, and 60°C, and the conveyor belt speed is 1 meter / minute. Since the fire-extinguishing microcapsules will rupture and release the fire extinguishing agent when exposed to open flames or high temperatures of around 120°C, temperature control during the vulcanization process is critical. By coordinating the temperature of the first incubator and the length of the space, the two are perfectly matched, protecting the wall material of the fire-extinguishing microcapsules intact during the vulcanization process.

[0031] 6) After the fire extinguishing microcapsule silica gel mixture is initially vulcanized in the first temperature chamber, the fire extinguishing microcapsule silica gel mixture is first rolled up, and then transported to the second temperature chamber for constant temperature and time vulcanization. The temperature of the second temperature chamber is controlled at 50°C, and the vulcanization time is controlled at 3 hours. After vulcanization in the second temperature chamber, it is completely solidified and rolled into shape to obtain an active fire extinguishing silica gel material coil. The coil is more convenient to transport and cut, and is convenient for industrial production.

[0032] Example 2:

[0033] A method for preparing an active fire extinguishing silica gel material, comprising the following steps:

[0034] 1) Low-temperature curing liquid two-component silicone is used. The liquid two-component silicone includes silicone A and silicone B. The ratio of silicone A to silicone B is 1:1. Silicone oil is added to the fire-extinguishing microcapsules, and then the fire-extinguishing microcapsules are added to silicone A and silicone B respectively. The weight of the fire-extinguishing microcapsules added to silicone A is 10% of the weight of silicone A, and the weight of the fire-extinguishing microcapsules added to silicone B is 10% of the weight of silicone B.

[0035] 2) Silica gel A and silica gel B with the fire extinguishing microcapsules added thereto are stirred separately by a high-speed disperser; the stirring speed does not exceed 80 rpm.

[0036] 3) The separately stirred silica gel A and silica gel B are mixed and stirred in a mixer to form a fire-extinguishing microcapsule silica gel mixture. The mixed and stirred fire-extinguishing microcapsule silica gel mixture is discharged at a temperature of 30°C. The temperature is controlled by controlling the stirring speed at 120 rpm and providing a cooling device. The cooling device uses a flowing liquid refrigerant to remove heat.

[0037] 4) The fire-extinguishing microcapsule silica gel mixture is attached to a carrier using a release film. The fire-extinguishing microcapsule silica gel mixture is sandwiched between two layers of release film. The carrier with the fire-extinguishing microcapsule silica gel mixture is then conveyed to a calender for pressing and stretching. The calender roller temperature is set at 35°C.

[0038] 5) The pressed and stretched fire extinguishing microcapsule silica gel mixture is vulcanized in a first incubator having a length of 15 meters. The fire extinguishing microcapsule silica gel is transported in the first incubator by a conveyor belt, and the temperature is gradually increased from 25° C. to 75° C. during the transportation process. Specifically, the temperature change of the first incubator is set along its length direction, and is set to 25° C., 35° C., 45° C., 55° C., 65° C., and 75° C. in sequence. The conveying speed of the conveyor belt is 1 m / min.

[0039] 6) After the fire extinguishing microcapsule silica gel mixture is initially vulcanized in the first temperature chamber, a layer of release film is removed and the fire extinguishing microcapsule silica gel mixture is rolled up. After rolling up, it is transported to the second temperature chamber for constant temperature and time vulcanization. The temperature of the second temperature chamber is controlled at 60°C and the vulcanization time is controlled at 2 hours. After vulcanization in the second temperature chamber, it is completely solidified and rolled up to obtain an active fire extinguishing silica gel material coil, which is used as a finished product or for future die-cutting.

[0040] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention in any form. Any person with ordinary knowledge in the technical field can make equivalent embodiments by making partial changes or modifications to the technical contents disclosed by the present invention without departing from the scope of the technical features of the present invention, and the equivalent embodiments still fall within the scope of the technical features of the present invention without departing from the technical features of the present invention.

Claims

1. A method for preparing an active fire extinguishing silica gel material, characterized in that The following steps are involved: 1) Using a low-temperature curing liquid two-component silicone rubber, the liquid two-component silicone rubber includes silicone A and silicone B. Fire extinguishing microcapsules are added to silicone A and silicone B respectively; the ratio of silicone A to silicone B is 1:1; the weight of the fire extinguishing microcapsules added to silicone A is 5-10% of the weight of silicone A; the weight of the fire extinguishing microcapsules added to silicone B is 5-10% of the weight of silicone B; 2) Stir silica gel A and silica gel B with fire extinguishing microcapsules separately; 3) Mixing and stirring the separately stirred silica gel A and silica gel B to form a fire extinguishing microcapsule silica gel mixture; 4) Press and extend the fire extinguishing microcapsule silica gel mixture; 5) The pressed and stretched fire-extinguishing microcapsule silica gel mixture is vulcanized in a first temperature box. The length of the first temperature box is 20 meters. The fire-extinguishing microcapsule silica gel is transported in the first temperature box by a conveyor belt. The temperature is gradually increased during the transportation process. The temperature change of the first temperature box is set along its length direction, and is set to 35°C, 40°C, 45°C, 50°C, 55°C, and 60°C in sequence. The conveying speed of the conveyor belt is 1 meter / minute. 6) After the fire extinguishing microcapsule silica gel mixture is initially vulcanized in the first temperature chamber, the fire extinguishing microcapsule silica gel mixture is rolled up and then transported to the second temperature chamber for vulcanization. The temperature of the second temperature chamber is controlled at 50-60°C and the vulcanization time is controlled at 2-3 hours. After vulcanization in the second temperature chamber, an active fire extinguishing silica gel material is obtained.

2. The method for preparing an active fire extinguishing silica gel material according to claim 1, characterized in that: In step 1), before adding the fire extinguishing microcapsules to silica gel A and silica gel B respectively, silicone oil is first added to the fire extinguishing microcapsules.

3. The method for preparing an active fire extinguishing silica gel material according to claim 1, characterized in that: In step 2), silica gel A and silica gel B containing fire extinguishing microcapsules are stirred separately by a high-speed disperser; the stirring speed does not exceed 80 rpm.

4. The method for preparing an active fire extinguishing silica gel material according to claim 1, characterized in that: In step 3), the silica gel A and silica gel B, which have been stirred separately, are mixed and stirred in a mixer; the temperature of the mixed and stirred fire-extinguishing microcapsule silica gel mixture is controlled to be 25-30° C. when it is output.

5. The method for preparing an active fire extinguishing silica gel material according to claim 4, characterized in that: In step 3), the temperature control is achieved by controlling the stirring speed and setting a cooling device, or either one of them, wherein the stirring speed is controlled to be 80 to 120 rpm, and the cooling device uses a flowing liquid refrigerant to remove heat.

6. The method for preparing an active fire extinguishing silica gel material according to claim 1, characterized in that: In step 4), before pressing and stretching, the fire extinguishing microcapsule silica gel mixture is attached to a carrier, which is a fireproof cloth or a release film; the fire extinguishing microcapsule silica gel mixture is pressed and stretched using a calender, and the roller temperature of the calender is 25 to 35°C.