CN110558646A - Fireproof suit based on silicon dioxide aerogel composite material and preparation method - Google Patents

Abstract

The invention relates to the field of fire protection technology, and provides a fireproof clothing based on a silica airgel composite material and a preparation method, using a new type of material, nano silica airgel, and compounding with glass fibers through a specific process to form silica Airgel blanket, select acrylic synthetic resin polymer AE‑7135 alcohol glue as adhesive, use high temperature resistant high strength fireproof and flame retardant glass fiber sewing thread to sew with ceramic fiber cloth with aluminum foil on the surface, and make a new type of fireproof Heat-insulating composite material, and use the composite material to make fireproof clothing. In addition, a GPS positioning chip is set in the fireproof clothing. The invention uses the novel silicon dioxide airgel composite material to realize a substantial improvement in the fireproof and heat insulation performance of firefighting clothing, and can provide safer and more reliable protection for firefighters in firefighting and disaster relief. The novel fireproof clothing made by the method has the advantages of excellent fireproof and heat insulation performance, affordable price and wide application range.

Description

Fireproof clothing and preparation method based on silica airgel composite material

technical field

The invention relates to the technical field of fire protection, in particular to a fire-resistant clothing based on a silica airgel composite material and a preparation method thereof.

Background technique

Firefighting clothing is thermal protective clothing worn by firefighters during fire rescue or fire fighting. As an important protective equipment to protect front-line firefighters under high temperature or ultra-high temperature conditions, the advantages and disadvantages of its flame retardancy and thermal protection directly It is related to the life safety of frontline firefighters. At present, although traditional fire protection clothing is widely used, there are still problems such as insufficient protection level, lack of comfort, high cost, and the command and dispatch system is susceptible to environmental interference. Therefore, it is necessary to study how to improve the fire protection performance, comfort level and command accuracy of fire protection clothing Undoubtedly, it is of great significance to improve the fire fighting and rescue efficiency of firefighters and reduce casualties and property losses.

Due to the characteristics of modern fires, traditional fire-resistant clothing is heavy in quality, high in cost, and easily affected by various factors during on-site command, which hinders command orders. There is an urgent need for fire-resistant clothing of new materials to improve the efficiency of fire fighting and rescue.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a fireproof clothing based on silica airgel composite material and its preparation method, through the new material silica airgel felt and ceramic fiber cloth, aluminum foil, alcohol The composite material composed of glue and ceramic fiber cloth, then properly cut and sewed, and equipped with a GPS positioning chip, can improve the quality of traditional fireproof clothing, which is heavy and expensive, and is easily affected by various factors during on-site command, leading to command orders. Obstructed and other problems, to improve the efficiency of fire fighting and rescue.

The present invention adopts following technical scheme:

A fireproof clothing based on silica airgel composite material, the fireproof layer of the fireproof clothing includes aluminum foil, ceramic fiber cloth, and silica airgel felt as the surface layer from the surface to the inside; the silica airgel The gel felt is modified by acrylic synthetic resin polymer AE-7135 alcohol glue; the aluminum foil, ceramic fiber cloth and silica airgel felt are combined into a whole.

Further, the modification treatment specifically includes: evenly applying AE-7135 alcohol glue on the two sides of the silica airgel felt, maintaining the flexibility of the silica airgel felt and being able to be compatible with the silica airgel felt. The inner surface of the ceramic fiber cloth is closely attached.

Further, the aluminum foil and the ceramic fiber cloth are stacked in a single layer, or the ceramic fiber cloth with aluminum foil is directly used.

Further, on the inner surface of the silica airgel felt, a cotton cloth layer is set as a comfort layer.

Further, the thickness of the aluminum foil is 0.2-0.4mm, the thickness of the ceramic fiber cloth is 0.1-0.3mm, and the thickness of the silica airgel felt is 4-6mm.

Further, the thickness of the aluminum foil is 0.3mm, the thickness of the ceramic fiber cloth is 0.2mm, and the thickness of the silica airgel felt is 5mm.

Further, when the fire-resistant clothing is sewn, the composite material is stitched and fixed with fire-resistant and flame-retardant glass fiber sewing thread to ensure that the overall structure is stable and the components do not slip and displace.

Further, a GPS positioning chip is set in the fireproof clothing.

Further, the fire-resistant temperature time of the fire-resistant clothing reaches: when continuously exposed to a 500°C flame, it will reach the comfort threshold of 41.3°C after 1 minute; when continuously exposed to a 1300°C flame, it will reach 59.8°C after 1 minute.

A preparation method of the above-mentioned fireproof clothing based on silica airgel composite material, comprising:

According to the design drawing, the fireproof clothing is cut and sewed in pieces, and the composite material composed of aluminum foil, ceramic fiber cloth, and silica airgel felt is divided into five major plates according to the front, left, and right sides of the body, the back, and the arms on both sides. Each plate is stitched with fire-resistant and flame-retardant glass fiber sewing thread, and the wiring at the joint should be kept inside the fire-resistant clothing as much as possible when stitching;

Surface treatment, fire-resistant fluorescent cloth is sewn with fire-resistant and flame-retardant glass fiber sewing thread on the surface of the arms on both sides and the torso of the body, so as to identify the position of personnel in the thick smoke at the fire scene, and a fire-resistant zipper is installed on the front side of the clothes. And leave a certain width of surface ceramic fiber cloth on the outside of the zipper, and stick the fireproof clothing on both sides of the zipper together through Velcro to protect the zipper;

The surface-treated fire-resistant clothing is internally processed, and the cotton cloth is cut and then sewn inside the fire-resistant clothing with fire-resistant and flame-retardant glass fiber sewing thread to serve as a comfortable layer; a built-in pocket is designed on the inner layer of the clothing, and a GPS positioning chip is implanted.

The present invention has the beneficial effects relative to traditional fireproof clothing as follows:

1. Compared with the traditional fireproof clothing, the fireproof and heat insulation performance of the new fireproof clothing has been greatly improved. Experimental research shows that the continuous use temperature of the outer layer of the new fireproof clothing, ceramic fiber cloth, can reach 1000 ° C, and the short-term use temperature can reach 1260 ° C. The fine nano-network structure of the thermal insulation airgel blanket can effectively limit the propagation of localized thermal excitations, and its solid-state thermal conductivity is 2-3 orders of magnitude lower than that of the corresponding glassy materials. It has been tested by experiments that the thermal conductivity of the silica airgel blanket itself is lower than 0.02w/m K. By means of doping, the radiation heat conduction of the airgel blanket can be further reduced. The thermal conductivity of the rubber felt can be as low as 0.013w/m·K. At a high temperature of 800K, the addition of titanium dioxide can reduce the thermal conductivity of the airgel felt to 0.03w/m·K.

2. Compared with the traditional fireproof clothing, the anti-radiation performance of the new fireproof clothing has been greatly improved. The refractive index of the airgel is close to 1, and the ratio of the annihilation coefficient to infrared rays and visible light is over 100, which can effectively transmit sunlight , and block infrared heat radiation at ambient temperature. At the same time, because the aluminum foil is opaque and reflective, it is used as the surface of the new fireproof clothing to further enhance the radiation protection performance of the fireproof clothing.

3. Compared with the traditional fireproof clothing, the new fireproof clothing is more green and environmentally friendly, and its service life has been greatly improved. Because the water-repellent rate of the airgel nano-insulation blanket of the new fire-resistant clothing insulation layer can reach more than 99%, it can avoid the settlement failure of the material caused by water ingress, so the service life can reach more than 3 times that of traditional materials, and it can be used at normal strength. Under normal circumstances, the life span can reach ten years. Experiments have shown that the carbon black formed by the long-term combustion of the new fire-resistant clothing can be wiped off directly with paper towels or wet rags, which greatly facilitates the cleaning of the fire-resistant clothing and facilitates recycling.

4. Compared with the traditional fireproof clothing, the new fireproof clothing is more cost-effective and has a wider scope of application. After comparative research on the prices of fire-resistant clothing, the price of Type 97 fire-resistant clothing is 39.60 yuan, the price of new airgel fire-resistant clothing is 289.04 yuan, and the price of 14 types of fire-resistant clothing is 3253.00 yuan. Considering the comprehensive price and all aspects of performance, the new airgel fireproof clothing has the highest cost performance and is easy to promote. In addition to the fire rescue of firefighters, the applicable field can also be equipped in many aspects such as enterprises, hotels, shopping malls, and family residences.

5. The new fire-resistant clothing equipped with GPS positioning device can locate the position of firefighters in the fire scene, and has higher safety performance than traditional fire-resistant clothing. Using satellite positioning technology, the GPS positioning chip equipped with a virtual phone module is innovatively implanted into the fire-resistant clothing, realizing the two functions of locating the position of firefighters in the fire scene and timely feedback of fire scene information, which is not available in traditional fire-resistant clothing. .

Description of drawings

Figure 1 shows the comparison of thermal insulation effect with and without silica airgel.

Figure 2 shows a comparison of the thermal insulation effects of silica airgel with or without aluminum foil on the surface.

Figure 3 is a comparison of the heat insulation effect of ceramic fiber cloth with or without aluminum foil.

Figure 4 shows the comparison of the overall heat insulation effect in the multi-combination state.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with specific drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as isolated, and they can be combined with each other to achieve better technical effects.

Research train of thought of the present invention is as follows:

First of all, according to the study of the average temperature in the fire scene, a new material, silica airgel felt with strong fireproof and heat insulation properties, and ceramic fiber cloth with aluminum foil, which is a material with strong heat resistance, are selected to improve the low strength and poor toughness of the airgel felt. The shortcomings of AE-7135 alcohol glue was used as the coating, and the thermal protection performance was studied.

Prepare ceramic fiber cloth samples of equal size; ceramic fiber cloth samples with aluminum foil on the surface; composite samples of ceramic fiber cloth, airgel and alcohol glue with aluminum foil on the surface; 97-type fireproof clothing fabric samples; burn them separately Experiment, and observe the temperature inside the material within the same time period, determine the optimal composite method, and determine the composite material composite formed by combining three materials: silica airgel felt, alcohol glue, and ceramic fiber cloth with aluminum foil on the surface. best effect.

The application method of GPS positioning: using satellite positioning technology to innovatively implant the GPS positioning chip equipped with a virtual phone module into the interior of the fireproof clothing. The technicians track and communicate with the personnel in real time through mobile phones outside the fire scene, realizing the two functions of locating firefighters in the fire scene and timely feedback of fire scene information.

Basic parameters of materials

Airgel felt: It is a flexible insulation felt made of nano-silica airgel as the main material and compounded with glass fiber cotton or pre-oxidized fiber felt through a special process. It is characterized by low thermal conductivity, certain tensile and compressive strength, and is a new type of fireproof material. Airgel blanket is currently the solid thermal insulation material with the lowest thermal conductivity in the temperature range of about 400°C. It has the characteristics of softness, easy cutting, low density, inorganic fire prevention, overall hydrophobicity, and environmental protection. It can replace glass fiber products and asbestos insulation blankets. , Silicate fiber products and other non-environmentally friendly, traditional flexible thermal insulation materials with poor thermal insulation performance, as the thermal insulation layer of new fire-resistant clothing, have the following characteristics:

1. Lightweight: The density of the airgel felt material is extremely small, only 2.75 times that of air; the density of dry pine wood (500 kg per cubic meter) is 140 times that of air. Airgel blanket achieves the same thermal insulation effect, and the thickness is only a fraction of that of traditional materials. After heat preservation, the heat loss is small and the space utilization rate is high. And at high temperature, the above performance advantages are more obvious.

2. High structural strength: Airgel felt is very strong and durable, it can withstand the pressure equivalent to thousands of times its own mass, and has good tensile and compressive properties. Because the airgel felt has good flexibility and tensile strength, it can resist the internal stress caused by the stretching when it is stressed and the linear shrinkage when it is alternated between cold and heat. In addition, it has low thermal conductivity and low refractive index, and its insulating ability is 39 times stronger than the best fiberglass.

3. Heat insulation: The fine nano-network structure of airgel blanket effectively limits the propagation of local thermal excitation, and its solid-state thermal conductivity is 2-3 orders of magnitude lower than that of the corresponding glassy material. Nano-micro-holes suppress the contribution of gas molecules to heat conduction. The refractive index of airgel is close to 1, and the ratio of annihilation coefficient to infrared and visible light is more than 100, which can effectively transmit sunlight and prevent infrared heat radiation at ambient temperature. It has been widely used in solar energy utilization and building energy saving. application. The thermal conductivity of silica airgel felt itself is lower than 0.02w/m·K. By means of doping, the radiation heat conduction of airgel felt can be further reduced, and the thermal conductivity of carbon-doped airgel at normal temperature and pressure It can be as low as 0.013w/m·K. It is the solid material with the lowest thermal conductivity at present, and it is expected to replace polyurethane foam as a new type of thermal insulation material. The incorporation of titanium dioxide can make airgel a new type of high-temperature insulation material, and the thermal conductivity at 800K is only 0.03w/m·K.

4. Low sound velocity characteristics: airgel felt is an ideal acoustic delay or high temperature sound insulation material. The acoustic impedance of this material has a large variable range of 10 ³ -10 ⁷ (m ² s), which is an ideal acoustic resistance coupling material for ultrasonic detectors. For example, the commonly used acoustic resistance turns Zp=1.5×l0 ⁷ kg/ (m ² ·s) piezoelectric ceramics are used as ultrasonic generators and detectors, while the acoustic resistance of air is only 400kg/(m ² ·s). Preliminary experimental results show that airgel with a density of about 300kg/m ³ as a coupling material can increase the sound intensity by 30dB. If an airgel felt with a density gradient is used, a higher sound intensity gain can be expected. In terms of environmental protection and chemical industry, nano-structured airgel felt can also be used as a new type of gas filter material. The difference from other materials is that the material has uniform pore size distribution and high porosity. It is a high-efficiency gas filter material.

5. Waterproof and long service life: The water-repellent rate of airgel nano-insulation blanket can reach more than 99%, which can avoid the settlement failure of the material caused by water ingress, so the service life can reach more than three times that of traditional materials.

The basic characteristics of silica (SiO ₂ ) airgel mat are shown in Table 1.

Table 1 Basic properties of SiO ₂ airgel mat

Ceramic fiber cloth: It is made of ceramic fiber plus a certain proportion of organic fiber, lined with glass wire (steel wire) and spun into yarn, and then woven into cloth. The amount of organic fiber determines the ablation rate, the type of organic fiber determines the flexibility of the cloth (from good to bad: viscose, polyester, pulp), the thickness of the glass determines the strength, and the material of the steel wire Determines the strength of corrosion resistance (from good to bad: 304 stainless steel wire, 302 stainless steel wire, 201 stainless steel wire, iron wire). The twist of the weaving process determines the smoothness of the cloth, and the number of batches determines the density of the cloth. Has the following properties:

1. High temperature resistance, low thermal conductivity, thermal shock resistance, low heat capacity, the continuous use temperature can reach 1000°C, and the short-term use temperature can reach 1260°C.

2. Excellent high temperature resistance and insulation performance, long service life, ceramic fiber cloth, tape, packing and other products with alkali-free glass fiber as reinforcement material, have a higher level of electrical insulation and high temperature electrical insulation than glass fiber Insulation, the breakdown voltage is 5kV/mm.

3. It has the ability to resist the corrosion of non-ferrous metals such as aluminum and zinc, and has good resistance to acid and alkali corrosion and non-ferrous metals.

4. It has good low temperature and high temperature strength, thermal shrinkage rate (1232°C, 24h) is 35%, aluminum oxide content is 45-48%, organic fiber content is <20%, thermal conductivity (538°C, 8pcf) is 0.130W /m·K.

5. It is non-toxic and harmless, has no adverse effects on the environment, and is environmentally friendly and pollution-free.

Aluminum foil: It is a hot stamping material that is directly calendered into thin sheets of metal aluminum. Because aluminum is soft, ductile, and has a silvery white luster, if the calendered sheets are mounted on offset paper with sodium silicate and other substances Made of aluminum foil, can also be printed. Has the following properties:

(1) The surface of aluminum foil is extremely clean and hygienic, and no bacteria or microorganisms can grow on its surface.

(2) Aluminum foil is a non-toxic packaging material, which can be in direct contact with food without any danger to human health, and can be in direct contact with human skin.

(3) Aluminum foil is a tasteless and odorless packaging material that does not produce pungent odors.

(4) Whether at high temperature or low temperature, the aluminum foil will not have the phenomenon of grease penetration.

(5) Aluminum foil is an opaque packaging material that can prevent heat radiation to a certain extent.

(6) Aluminum foil has good plasticity and can be used to package products of various shapes. Containers of various shapes can also be made arbitrarily, which is suitable for making the surface of clothes.

AE-7135 Alcohol Glue: It is an acrylic synthetic resin polymer with high viscosity, stable properties, anti-pollution, good weather resistance, no damage to the skin, no adverse effects on plastics and iron wires, elastic after drying, colorless, suitable for use It has a very wide range and is a good adhesive for better coupling of materials. Has the following properties:

1. The appearance is transparent liquid, solid content: (55±2)%, viscosity: 80000-120000, with strong adhesion.

2. It will not corrode or dissolve the fabric itself. Easy to apply, easy to operate, fast drying, water resistance, transparent after drying without affecting the appearance of the adhesive.

After being glued, it will not affect the softness of the fabric, which can ensure comfortable wearing.

Fire-resistant and flame-retardant glass fiber sewing thread: It is made of high-temperature-resistant, high-strength, ultra-fine and tough glass fiber, which is processed by special technology. Glass fiber high temperature thread (high temperature sewing thread, fireproof thread) is used in the sewing of high temperature resistant fabrics, electrical insulation materials, cable fillers, winding heating wires and heating elements, heat insulation materials, seals, rubber tubes, high temperature tapes and other skeleton materials.

Cotton cloth: refers to the cloth made of cotton yarn, which is the general term for all kinds of cotton textiles. As a comfortable layer, it has the function of breathable and sweat-absorbing, easy to clean, non-toxic and harmless, and comfortable to wear. It has excellent moisture absorption and air permeability; the disadvantage is that it is easy to shrink and wrinkle, and the appearance is not very crisp and beautiful. It must be ironed frequently when wearing it. Has the following properties:

1. It has good moisture absorption and air permeability, comfortable to wear, soft to the touch, soft and rustic in luster.

2. It has good warmth retention property, excellent wearing performance, good dyeing property, bright color and complete color spectrum, but the color fastness is not good enough.

3. Alkali-resistant but not acid-resistant, concentrated alkali treatment can make the cross-section of the fiber in the fabric round, thereby improving the luster of the fabric, that is, mercerizing.

4. Good light fastness, but long-term exposure will cause fading and decrease in strength.

5. Poor elasticity, prone to wrinkles and difficult to restore creases, pure cotton fabrics are prone to mildew and deterioration, but are resistant to insects.

Example 1: Determination of the thermal insulation properties of thermal insulation layer silica airgel felt

Through the comparative study of various materials with thermal insulation properties, the thermal insulation properties of SiO ₂ airgel felts are finally explored and analyzed. The thermal insulation layer used in this experiment is 6mm thick SiO ₂ airgel felts, SiO 2 ₂ Airgel is a new type of material with the lowest density among existing solids. As the thickness increases, its heat insulation effect as a heat insulation layer of fireproof clothing shows almost a linear relationship.

Before the experiment, considering the thickness, flexibility, and heat insulation effect of the fireproof clothing, the thickness of the SiO ₂ airgel blanket was roughly set at 6mm by optimizing the results of the preliminary measurement of the experiment to determine the effective and practical range of the experiment.

Referring to the relevant fire-resistant clothing standards, the continuous burning time of the experiment is set at 1min, and the fire-resistant and heat-insulated test is carried out by using ordinary lighting candles (flame temperature 500°C) on the market. The high-temperature material is equipped with aluminum foil ceramic fiber cloth, and at the same time, alcohol glue is added to combine the _two . In addition, a blank control test is set. According to the principle of single variable, a controlled test was carried out, and the test results are shown in Figure 1.

(Note: The following materials are all in abbreviated form, pottery—ceramic fiber cloth, aluminum—aluminum foil, gas— _SiO2 airgel felt, wine—alcohol glue)

It can be seen from Figure 1 that when no SiO ₂ airgel is used as the heat insulation layer, the temperature rises steeply as the continuous heating time increases within 1 minute, and reaches 45°C in only about 15 seconds. It is within the range that the matching personnel feel stuffy and uncomfortable; and when there is SiO ₂ airgel as the heat insulation layer, within 1min, with the increase of continuous heating time, the temperature rises slowly, and it reaches 45°C in about 60s, indicating that the addition of SiO ₂ gas After the gel treatment, it has an obvious heat insulation effect, and as the heating time increases, the temperature of the two will still maintain the original rate of increase.

Considering that the aluminum foil on the surface has the effect of anti-infrared radiation and the flame-retardant effect of ceramic fiber cloth, which may affect the characteristic detection of _SiO2 airgel, so on the basis of the above experiment, after both of them remove the aluminum foil, they maintain the same According to the experimental conditions, the control test of SiO ₂ airgel was carried out, and the results obtained are shown in Figure 2. At the same time, after the aerogel was retained, the same experimental conditions were maintained, and a control experiment was carried out with and without aluminum foil ceramic fiber cloth, and the results were shown in Figure 3.

It can be seen from Figure 2 that after the aluminum foil is removed from the surface layers of both, when no SiO ₂ airgel is used as the heat insulation layer, within 1 minute, as the continuous heating time increases, the temperature rises more steeply, reaching 45 in only about 10s. ℃, at this time, the inside of the fireproof clothing will reach the temperature range of sultry heat and discomfort of the human body; and when SiO ₂ airgel is used as the heat insulation layer, within 1 minute, with the increase of the continuous heating time, the temperature rises relatively slowly, and it only takes about 38s. Reaching 45°C, it shows again that after adding SiO ₂ airgel treatment, SiO ₂ airgel has an obvious heat insulation effect, and with the increase of heating time, the temperature of the two will still maintain the original rate of growth. At the same time, through the analysis of the experimental data in Figure 1 and Figure 2, when both reach 45°C, the time is advanced, indicating that aluminum foil also plays a non-negligible role in resisting the infrared radiation of the flame, and can reflect part of the infrared.

It can be seen from Figure 3 that when the ceramic fiber cloth without aluminum foil is used as the outer layer, within 1 minute, as the continuous heating time increases, the temperature rises relatively slowly, and reaches 45°C in about 30 seconds. However, when the ceramic fiber cloth with aluminum foil is used as the outer layer, the temperature rises slowly with the increase of the continuous heating time within 1min, and it reaches 45°C in about 60s, indicating that after the ceramic fiber cloth with aluminum foil is used as the outer layer, the To the heat insulation effect, but compared with Figure 1, the heat insulation effect is not obvious. And with the increase of heating time, the temperature of the two will still maintain the original rate of growth.

Using the single variable principle, each variable is compared one by one, and the comparison of the overall experimental data is shown in Figure 4.

It can be seen from Figure 4 that the temperature of each experimental group increases with the increase of time, but the degree of change is different. It can be seen from the figure that the experimental group with only ceramic fiber cloth and alcohol glue is the steepest, and the ceramic with aluminum foil The experimental group of fiber cloth, airgel and alcohol glue was the most gentle. It shows that this experimental group has the best heat insulation effect.

Embodiment 2: The adsorption peculiar smell characteristic of SiO2 airgel mat is determined

From the analysis of the structural characteristics of SiO ₂ airgel felt, because SiO ₂ airgel has the characteristics of high air conductivity, we conduct a gas filtration test on it, and only use ceramic fiber cloth with an aluminum foil surface or Type 97 fireproof clothing The fabric is burned in the outer flame of the candle, and the irritating smell can be clearly smelled, but after we combine it with alcohol glue and SiO ₂ airgel felt, and test it under the same experimental conditions, there is almost no irritating smell smell, indicating that the SiO ₂ airgel felt acts as an adsorption medium and filters air.

Example 3: Determination of the easy-to-clean properties of aluminum foils

The above comparison experiment shows that aluminum foil has good anti-infrared radiation characteristics. Considering the smooth and hydrophobic surface of aluminum foil, this research found that the residual carbon black on the surface of aluminum foil can be wiped off with a damp rag or paper towel after burning a candle. , which fully demonstrates the easy-cleaning properties of aluminum foil and facilitates the cleaning of fire-resistant clothing.

Embodiment 4: preparation method of fireproof clothing

First, cut and sew the fire-resistant clothing in blocks according to the drawn design drawings, divide the composite material into five major plates according to the front, left, and right sides of the body, the back, and the arms on both sides, and sew each plate with fire-resistant and flame-retardant glass fiber sewing thread , When sewing, try to keep the wiring at the connection inside the fire-resistant clothing, so as to avoid direct contact with high-temperature flames in the fire scene, and reduce the weak area of the fire-resistant clothing as much as possible.

Next, surface treatment is carried out on the preliminarily formed fire-resistant clothing, and fire-resistant fluorescent cloth is sewn on the surfaces of the arms on both sides and the torso of the body with fire-resistant and flame-retardant glass fiber sewing thread, so as to identify the position of personnel in the thick smoke at the fire scene. A fire-resistant zipper is added to the front merge, and a certain width of surface ceramic fiber cloth is left on the outside of the zipper, and the fire-resistant clothing on both sides of the zipper is glued together by Velcro to protect the zipper. Targeted treatment of the collar of fire-resistant clothing makes it fire-resistant and comfortable to wear.

Then the surface-treated fire-resistant clothing is internally processed, and the cotton cloth is cut and then sewn inside the fire-resistant clothing with fire-resistant and flame-retardant glass fiber sewing thread to serve as a comfortable layer. Built-in pockets are designed on the inner layer of clothes, and GPS positioning chips are implanted.

Finally, the final series of tests are carried out on the finished fireproof clothing, including the heat insulation performance test: the internal temperature of the flame directly burning at 500°C for 1 minute should not be higher than 40°C, and there should be no melting or dripping. GPS positioning performance test: test the positioning effect, and the error is controlled within 5-10m. and provide timely feedback. Weight test: test whether the weight of the fireproof clothing meets the national standard, and the weight of the whole set of clothing should not exceed 3.5kg. Strength test: the longitudinal and latitudinal dry breaking strength should not be less than 650N. The warp and weft tear strength should not be less than 100N. The breaking strength of the outer seam of the protective clothing should not be less than 650N. Air permeability test: The water vapor transmission rate should not be less than 5000g/㎡.24h. Durability test: After washing 25 times, there should be no breakage, shedding, or discoloration. Fireproof clothing that passes all tests is a qualified finished product.

Aiming at the problems of insufficient fireproof and heat insulation performance and insufficient thermal radiation resistance of the existing fireproof clothing, the present invention adopts a new material nano-silica aerogel (Silica aerogel), which is compounded with glass fiber through a special process to form silica aerogel Rubber felt, choose acrylic synthetic resin polymer AE-7135 alcohol glue as the adhesive, use high temperature resistant high strength fireproof flame retardant glass fiber sewing thread and the outer protective layer of fireproof clothing (ceramic fiber cloth with aluminum foil) to sew together to make a A new type of fire-proof and heat-insulating composite material. The composite material passed the flame continuous combustion experiment at 500°C, and the temperature rise was monitored in real time with a temperature measuring gun. Various combinations of airgel composite materials and ordinary fireproof cloth were compared to determine the temperature rise of different forms of composite materials after continuous combustion. And the combination material with the least temperature rise in the same combustion time is selected as the optimal combination. Its material composition is as follows: ceramic fiber cloth whose surface layer is aluminum foil 2mm, airgel felt 6mm, alcohol glue. After the composite material was continuously burned by the flame at 500°C for 21s, the inner temperature was 32.3°C, after being continuously burned by the 500°C flame for 60s, the inner temperature was 43.9°C, and after being continuously burned by the 1300°C flame for 60s, the inner temperature was 59.8°C. Compared with the 97-type fire-resistant clothing fabric, the structure will be destroyed after 500 °C flames continue to burn for 10 seconds. The new silica airgel composite material has greatly improved the fire-proof and heat-insulating performance of fire-fighting clothing, and can provide firefighters with more safe and reliable protection against fire and disaster relief. Assure. The new fireproof clothing made of silica airgel composite material will have the advantages of excellent fireproof and heat insulation performance, affordable price and wide application. On this basis, the use of satellite positioning technology innovatively implanted the GPS positioning chip equipped with a virtual phone module into the interior of the fire protection suit, realizing the two functions of locating the position of firefighters in the fire scene and timely feedback of fire scene information, providing a new fire protection It provides new ideas for the research of fire protection and has important practical guiding significance for the development of fire protection.

Although several embodiments of the present invention have been given herein, those skilled in the art should understand that the embodiments herein can be changed without departing from the spirit of the present invention. The above-mentioned embodiments are only exemplary, and the embodiments herein should not be used as limitations on the scope of rights of the present invention.

Claims (10)

1. The fireproof suit based on the silicon dioxide aerogel composite material is characterized in that a fireproof layer of the fireproof suit sequentially comprises an aluminum foil, ceramic fiber cloth and a silicon dioxide aerogel felt from the surface to the inside; the silica aerogel felt is subjected to modification treatment by acrylic acid synthetic resin polymer AE-7135 alcohol glue; the aluminum foil, the ceramic fiber cloth and the silicon dioxide aerogel felt are combined into a whole.

2. the silica aerogel composite-based fire protection suit of claim 1, wherein the modification treatment is in particular: AE-7135 alcohol glue is uniformly coated on 2 side faces of the silica aerogel felt, and the silica aerogel felt can be tightly attached to the inner surface of the ceramic fiber cloth while flexibility of the silica aerogel felt is kept.

3. The silica aerogel composite-based fire protection suit of claim 1, wherein said aluminum foil and said ceramic fiber cloth are stacked in a single layer, or a ceramic fiber cloth with an aluminum foil surface layer is directly used.

4. The silica aerogel composite-based fire protection suit of claim 1, wherein a cotton cloth layer is provided as a comfort layer on the inner surface of said silica aerogel blanket.

5. The silica aerogel composite-based fire protection suit of any one of claims 1 to 4, wherein said aluminum foil has a thickness of 0.2 to 0.4mm, said ceramic fiber cloth has a thickness of 0.1 to 0.3mm, and said silica aerogel blanket has a thickness of 4 to 6 mm.

6. The silica aerogel composite-based fire suit of claim 5, wherein said aluminum foil is 0.3mm thick, said ceramic fiber cloth is 0.2mm thick, and said silica aerogel blanket is 5mm thick.

7. The silica aerogel composite-based fire protection suit of claim 5, wherein said fire protection suit is sewn using fire-resistant and fire-retardant fiberglass sewing thread to secure the composite material, ensuring the overall structural stability and the components are not slip or dislocated.

8. The silica aerogel composite-based fireprotective clothing of claim 5, wherein a GPS positioning chip is provided in said fireprotective clothing.

9. A fire suit based on a silica aerogel composite according to claim 6, characterized in that said fire suit has a fire resistance temperature and time such as to reach: when the flame is continuously contacted with the flame of 500 ℃, the comfort critical value of 41.3 ℃ is reached after 1 min; upon continued exposure to the 1300 ℃ flame, 59.8 ℃ is reached after 1 min.

10. The method of preparing a silica aerogel composite-based fire suit according to any of claims 1 to 10, comprising:

The fireproof suit is cut and sewn in blocks according to a design drawing, a composite material consisting of aluminum foils, ceramic fiber cloth and silicon dioxide aerogel felts is divided into five plates according to the left and right sides, the back and the arms at the two sides of the body, each plate is sewn by fireproof flame-retardant glass fiber sewing threads, and the threads at the joint are retracted into the fireproof suit as much as possible during sewing;

Surface treatment processing, namely sewing fireproof fluorescent cloth on the surfaces of arms at two sides and the trunk part of a body by using fireproof flame-retardant glass fiber sewing threads so as to identify the position of a person in dense smoke in a fire scene, additionally arranging a fireproof zipper at the combination position of the front side of the clothes, reserving surface ceramic fiber cloth with a certain width at the outer side of the zipper, and adhering fireproof clothes at two sides of the zipper together by using a magic tape so as to play a role in protecting the zipper;

The fireproof clothing after surface treatment is internally processed, cotton cloth is cut, and then the fireproof flame-retardant glass fiber is sewn inside the fireproof clothing to serve as a comfortable layer; a built-in pocket is designed on the inner layer of the clothes, and a GPS positioning chip is implanted.