CN106497339A - A kind of power equipment environment-friendly fireproof material and preparation method thereof - Google Patents

Abstract

The invention provides an environment-friendly fireproof material for electric equipment and a preparation method thereof, belonging to the technical field of fireproof material and its preparation. An environment-friendly fireproof material for power equipment, characterized in that it is made of the following raw materials in parts by weight: 50-60 parts of modified epoxy resin, 30-40 parts of fluorocarbon resin, 60-90 parts of flame retardant, expansion 3~10 parts of graphite, 3~10 parts of aluminum silicate fiber, 2~8 parts of molecular sieve. The fireproof material of the present invention is applied to fireproofing electric equipment, has excellent crack resistance, water resistance and weather resistance, good expansion performance, and can significantly reduce the heat release rate of the substrate in the burning state, reduce mass loss, and produce smoke Small quantity, good environmental protection effect.

Description

A kind of environment-friendly fireproof material for electric equipment and preparation method thereof

technical field

The invention belongs to the technical field of fireproof materials and their preparation, and in particular relates to an environment-friendly fireproof material for electric equipment and a preparation method thereof.

Background technique

With the rapid development of modern technology and the power industry, power equipment has become an important part of our daily work and life, providing us with services such as industrial power, civil power, telecommunications, data transmission, Internet, business, finance, Technology, medical and other multi-faceted power services. Our reliance on electricity has also become increasingly intense. Compared with the past situation, the power equipment itself has been highly sophisticated, the functions are more and more complete, and the cost has become more and more expensive, so a small fire in the power equipment will cause very serious consequences. This includes not only the loss of the equipment itself, but also the loss caused by the interruption of power service caused by it is immeasurable. Therefore, the safety of power equipment, especially the prevention of fire, has become the primary issue to ensure the safety of power equipment and ensure the normal operation of power services. Coating fire-resistant materials is an economical and safe measure, coupled with a modern fire protection system, it can well solve the safety problem of electrical equipment.

Fireproof materials can be divided into two types: intumescent fireproof materials and non-expandable fireproof materials according to their flame retardant mechanism. Non-intumescent coatings mainly use the flame retardancy and non-combustibility of the coating itself, and at the same time, it can release fire-extinguishing gas under flame or high temperature, and form a non-combustible inorganic "glaze film" layer to isolate the air, so as to prevent or delay being burned. The paint caught fire and burned. The intumescent fireproof material is that its coating expands and carbonizes under flame or high temperature, forming a non-flammable spongy carbonaceous layer that is dozens or even hundreds of times thicker than the original film, so as to isolate the heating of the substrate by external flames. . At the same time, a large amount of non-combustible gas is produced during the melting and expansion of the coating film, which dilutes the flammable gas generated by the thermal decomposition of the substrate, and can effectively prevent the spread of flames. It is a truly effective fireproof material. Intumescent flame retardant polymer is a new flame retardant technology developed on the basis of flame retardant coatings. It blends intumescent flame retardants containing carbon sources, acid sources and gas sources with polymers to form flame retardant materials. When the intumescent flame retardant material is burned, the acid source releases inorganic acid, which esterifies the polyol contained in the carbon source, and then dehydrates and carbonizes. The viscous carbonized product releases inert gas from the gas source, water vapor generated by the reaction, and polymer degradation. Under the action of small molecular volatiles, it expands to form a carbon layer with a microporous structure. The expanded charcoal layer has the functions of oxygen insulation, heat insulation, no droplet dripping and flame self-extinguishing.

At present, the fireproof materials on the market are mainly intumescent, which can effectively protect structures from damage and deformation. Once a fire occurs, the protective effect of fireproof materials can increase the time for personnel to escape and rescue, greatly reduce maintenance costs, and shorten project repairs. time, and avoid causing more casualties and property losses. Patent CN201210217965.7 discloses bromocarbon alkyd resin cable fireproof coating and its preparation method. The components of the fireproof coating are: bromocarbon alkyd resin, ammonium polyphosphate, melamine, pentaerythritol, antimony trioxide, zinc borate, bentonite , titanium dioxide, chlorinated paraffin, molybdenum trioxide, simethicone, drier, solvent. The fireproof coating of the invention is used for cable fireproofing, and has balanced performance and outstanding comprehensive performance. However, when the fireproof material is burned, it produces a lot of smoke, and its anti-crack performance needs to be improved. Patent CN201610263081 discloses a fireproof coating for electric equipment, including the following raw materials in parts by weight: 50-60 parts of organosiloxane-acrylate copolymer emulsion, 30-40 parts of polyvinyl formal, 5 parts of azobisisobutyronitrile -10 parts, 5-10 parts of vinyl acetate, 5-10 parts of maleic anhydride, 3-5 parts of lead sulfite, 3-5 parts of rare earth stabilizer, 2-4 parts of polyurethane resin, defoamer HT-6065- 10 parts, magnesium hydroxide 2-4 parts, aluminum hydroxide 2-4 parts, deionized water 10-20 parts. The fire resistance limit is not less than 3 hours, the water resistance is ≥26 hours, and the cold and heat cycle resistance is ≥20 times. However, some materials used in the fire retardant coating have relatively high toxicity and are prone to produce toxic smoke when burned, which is not conducive to popularization and utilization. The above-mentioned fireproof materials can be applied to power equipment, which can meet the fireproof requirements of power equipment to varying degrees. However, the carbonization layer of the fireproof material is not dense enough, the amount of smoke is large, and the weather resistance performance needs to be improved.

Contents of the invention

In view of this, the technical problem to be solved by the present invention is to provide an environment-friendly fireproof material for power equipment with environmentally friendly raw materials, good film-forming effect, low smoke generation and strong weather resistance.

In order to achieve the above purpose, the technical solution adopted in the present invention is: an environmentally friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 50-60 parts of modified epoxy resin, 30-40 parts of fluorocarbon resin , 60~90 parts of flame retardant, 3~10 parts of expanded graphite, 3~10 parts of aluminum silicate fiber, 2~8 parts of molecular sieve.

Preferably, the flame retardant is made of tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 4~6:0.5~1.5.5:1.5~3.

Preferably, the flame retardant is 70-80 parts by weight.

Preferably, the weight ratio of tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol is 3:1:1.5.

Preferably, the particle size of the expanded graphite is 200-300 μm.

A method for preparing an environment-friendly fireproof material for electric equipment, comprising the following steps:

Step S1: Weigh 35-70 parts by weight of flame retardant, 3-10 parts of expanded graphite and 3-10 parts of aluminum silicate fiber and mix them vigorously in a high-shear homogenizer until completely uniformly dispersed to obtain a homogeneous material;

Step S2: Add the obtained homogeneous material to the premix of 50-60 parts by weight of modified epoxy resin and 30-40 parts by weight of fluorocarbon resin, and stir for 5-12 minutes with a stirrer at a rotating speed of 80-120 r/min Then add 2-8 parts by weight of molecular sieves, stir for 45-60 minutes with a stirrer with a rotating speed of 900-1000r/min, and dilute with distilled water to the required concentration to obtain the fireproof material.

Preferably, the flame retardant is obtained by the following preparation method: according to the weight ratio of tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol is 4~6:0.5~1.5.5:1.5~3, Weigh and mix tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol respectively, and shear and stir at 2000~2500r/min for 10~15 minutes.

Preferably, the fireproof material is evenly sprayed on the surface of the electric equipment, and the coating thickness is controlled to be 0.5-1.5mm.

Compared with the prior art, the present invention has the following beneficial effects:

In the present invention, the modified epoxy resin and the fluorocarbon resin are jointly used as the film-forming material, and the modified epoxy resin has the advantages of excellent melt flow rate, high flame retardant efficiency, no migration, and excellent weather resistance; Resin has many excellent properties such as good corrosion resistance, self-cleaning property and flexibility, but its low hardness and poor temperature resistance limit its application. It is well known that the film-forming substances used in fireproof materials can not only meet the requirements of self-drying at room temperature, film-forming properties, water resistance, adhesion, heat resistance and chemical stability, but also meet the requirements that the coating has flame retardancy and excellent performance under the action of flame or high temperature. expansion effect. Through experiments, it is found that the modified epoxy resin and fluorocarbon resin are used together at a weight ratio of 50~60:30~40. Compared with single use of modified epoxy resin or fluorocarbon resin, the temperature resistance is improved and the fire resistance time is extended by 10 minutes. Above, the expansion ratio is increased by more than 25%, and the foam layer is characterized by a uniform carbon layer and a dense surface. However, increasing the specific gravity of fluorocarbon resin or reducing the specific gravity of modified epoxy resin on this basis will weaken the expansion ratio, fire resistance time and foam layer quality to varying degrees.

Adding expanded graphite to the fireproof material of the present invention can enhance the strength of the carbon layer of the expanded system. At the same time, the expanded graphite has a smooth surface and good heat resistance, and can also improve the compactness and brushing performance of the expanded system. When it encounters a heat source, the volume The rapid expansion produces insulating graphite sheets, which impart good flame-retardant properties to the matrix. Tests have shown that adding 3-10 parts by weight of expanded graphite can significantly improve the performance of the fireproof material, and too much or too little will have no obvious beneficial effect. In addition, the present invention also adds an appropriate amount of aluminum silicate fiber, on the one hand, it cooperates with expanded graphite to increase the strength of the charcoal layer and reduce the cracks in the charcoal layer; on the other hand, the aluminum silicate fiber has stable properties and low thermal conductivity. It can prevent the transmission of flame, oxygen, heat mass, etc., reduce the thermal conductivity of the material, and play a role in heat insulation protection. Molecular sieve is a kind of aluminosilicate crystal with a skeleton structure. Adding it to the fireproof material can improve the flame retardant performance of the base material, enhance the stability of the melt, and at the same time improve the strength and stability of the carbon layer, and increase the internal structural strength of the carbonization layer. Hole wall thickening. Through the synergy of the above materials, the substrate is protected to prevent radiant heat and direct contact with the flame, and effectively isolate the combustible gas and heat generated during external combustion from propagating internally, thereby achieving the purpose of flame retardancy.

The flame retardant of the present invention is compounded with tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol. Tests have shown that the flame retardant has relatively low solubility in most common solvents at room temperature and has good Thermal stability, forming a relatively ideal synergistic flame retardant effect with film-forming substances and their additives, can form a stable carbon layer with an appropriate thickness on the surface of the substrate, no melting dripping phenomenon during combustion, and significantly improve the resistance of the substrate Combustibility, while brushing on the surface of the substrate can improve the mechanical properties of the substrate.

The fireproof material of the present invention is applied to fireproofing electric equipment, has excellent crack resistance, water resistance and weather resistance, good expansion performance, and can significantly reduce the heat release rate of the substrate in the burning state, reduce mass loss, and produce smoke Small quantity, good environmental protection effect.

detailed description

In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the examples, but the protection content of the present invention is not limited to the following examples. In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details.

Embodiment 1: An environmentally friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 55 parts of modified epoxy resin, 35 parts of fluorocarbon resin, 75 parts of flame retardant, 6 parts of expanded graphite, silicic acid 7 parts of aluminum fiber, 5 parts of molecular sieve.

The flame retardant is made from the tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 3:1:1.5.

The particle size of the expanded graphite is 200 μm. The test shows that different particle sizes of expanded graphite have different effects on the strength of the carbon layer in the expansion system. If the particle size of expanded graphite is too small, the specific surface area increases rapidly and the cooling effect is remarkable, but it is not conducive to the improvement of the density and strength of the carbon layer; while the particle size If the diameter is too large, the heat insulation effect will be deteriorated, and the compactness of the char-forming layer will also be weakened. Therefore, choosing a reasonable particle size range of expanded graphite has a positive impact on the improvement of the performance of fireproof materials.

In the present invention, the modified epoxy resin is glycidyl ether epoxy resin, for example: brominated epoxy resin, glycerin epoxy resin and the like.

A method for preparing an environment-friendly fireproof material for electric equipment, comprising the following steps:

Step S1: Weigh the flame retardant, expanded graphite and aluminum silicate fiber in the above parts by weight and mix them vigorously in a high-shear homogenizer until they are completely uniformly dispersed to obtain a homogeneous material;

Step S2: Add the obtained homogeneous material to the premix of modified epoxy resin and fluorocarbon resin in the above parts by weight, and stir for 8 minutes with a stirrer with a rotating speed of 100r/min; then add molecular sieves, and min mixer for 50 minutes, diluted with distilled water to the desired concentration, that is, the fireproof material.

The flame retardant is obtained by the following preparation method: separately weigh tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol, mix them, and shear and stir at 2500 r/min for 12 minutes.

The fireproof material is evenly sprayed on the surface of the electric equipment, and the coating thickness is controlled to be 0.5~1.5mm. The thickness of the coating affects the heat insulation and flame retardant performance of the fireproof material. If the thickness is small, the expected flame retardant effect cannot be achieved. If the thickness is too large, the performance of the substrate will be affected. The electrical equipment described in the present invention includes, but is not limited to: cables, wires, distribution cabinets, distribution rooms, and the like.

Embodiment 2: An environmentally friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 50 parts of modified epoxy resin, 30 parts of fluorocarbon resin, 70 parts of flame retardant, 5 parts of expanded graphite, silicic acid Aluminum fiber 5 parts, molecular sieve 7 parts.

The flame retardant is made from the tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 3:1:1.5.

The particle size of the expanded graphite is 200 μm.

A method for preparing an environment-friendly fireproof material for electric equipment, comprising the following steps:

Step S1: Weigh the flame retardant, expanded graphite and aluminum silicate fiber in the above parts by weight and mix them vigorously in a high-shear homogenizer until they are completely uniformly dispersed to obtain a homogeneous material;

Step S2: Add the obtained homogeneous material to the premix of modified epoxy resin and fluorocarbon resin in the above parts by weight, and stir for 5 minutes with a stirrer with a rotating speed of 80r/min; then add molecular sieves, and min mixer for 45 minutes, diluted with distilled water to the required concentration, that is, the fireproof material.

The flame retardant is obtained by the following preparation method: separately weigh tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol, mix them, and shear and stir at 2500 r/min for 10 minutes.

The fireproof material is evenly sprayed on the surface of the electric equipment, and the coating thickness is controlled to be 0.5~1.5mm.

Embodiment 3: An environmentally friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 60 parts of modified epoxy resin, 40 parts of fluorocarbon resin, 80 parts of flame retardant, 8 parts of expanded graphite, silicic acid 4 parts of aluminum fiber, 4 parts of molecular sieve.

The flame retardant is made from the tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 3:1:1.5.

The particle size of the expanded graphite is 300 μm.

A method for preparing an environment-friendly fireproof material for electric equipment, comprising the following steps:

Step S1: Weigh the flame retardant, expanded graphite and aluminum silicate fiber in the above parts by weight and mix them vigorously in a high-shear homogenizer until they are completely uniformly dispersed to obtain a homogeneous material;

Step S2: Add the obtained homogeneous material to the premix of modified epoxy resin and fluorocarbon resin in the above parts by weight, and stir for 12 minutes with a stirrer with a rotating speed of 120r/min; then add molecular sieves, and min mixer for 60 minutes, diluted with distilled water to the required concentration, that is, the fireproof material.

The flame retardant is obtained by the following preparation method: separately weigh tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol, mix them, and shear and stir at 2000 r/min for 15 minutes.

The fireproof material is evenly sprayed on the surface of the electric equipment, and the coating thickness is controlled to be 0.5~1.5mm.

Embodiment 4: An environmentally friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 52 parts of modified epoxy resin, 34 parts of fluorocarbon resin, 65 parts of flame retardant, 3 parts of expanded graphite, silicic acid 3 parts of aluminum fiber, 2 parts of molecular sieve.

The flame retardant is made of tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 4:1:1.5.

The particle size of the expanded graphite is 300 μm.

Embodiment 5: An environment-friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 58 parts of modified epoxy resin, 46 parts of fluorocarbon resin, 85 parts of flame retardant, 9 parts of expanded graphite, silicic acid 8 parts of aluminum fiber, 7 parts of molecular sieve.

The flame retardant is made of tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 5:1.5:2.

The particle size of the expanded graphite is 200 μm.

Embodiment 6: An environmentally friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 50 parts of modified epoxy resin, 30 parts of fluorocarbon resin, 60 parts of flame retardant, 3 parts of expanded graphite, silicic acid 3 parts of aluminum fiber, 2 parts of molecular sieve.

The flame retardant is made of tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 6:2.5:3.

The particle size of the expanded graphite is 200 μm.

Embodiment 7: An environmentally friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 60 parts of modified epoxy resin, 40 parts of fluorocarbon resin, 90 parts of flame retardant, 10 parts of expanded graphite, silicic acid 10 parts of aluminum fiber, 8 parts of molecular sieve.

The flame retardant is made of tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 5.5:2:2.5.

The particle size of the expanded graphite is 300 μm.

Embodiment 8: An environmentally friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 55 parts of modified epoxy resin, 35 parts of fluorocarbon resin, 65 parts of flame retardant, 7 parts of expanded graphite, silicic acid Aluminum fiber 6 parts, molecular sieve 5 parts.

The flame retardant is made of tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 4.5:1.5:2.

The particle size of the expanded graphite is 200 μm.

Embodiment 9: An environmentally friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 55 parts of modified epoxy resin, 35 parts of fluorocarbon resin, 75 parts of flame retardant, 6 parts of expanded graphite, silicic acid 7 parts of aluminum fiber, 5 parts of molecular sieve. Each raw material kind is with embodiment 1.

In the present invention, modified epoxy resin is prepared by the following method:

1) Weigh 25 parts by weight of bisphenol-A epoxy resin and 1 part by weight of propyltrimethoxysilane, add them into the container, heat in a water bath to 72±3°C, drop tetramethyl at a rate of 50~60 drops/minute base ammonium hydroxide aqueous solution, stirred and heated to 85±5°C, and reacted for 3 hours;

2) Then add 3 parts by weight of hydroxymethylated enzymatic lignin, heat up to 120° C., stir and keep warm for 1 hour, vacuum defoam, and stand for 24 hours to obtain.

Comparative example 1: An environment-friendly fireproof material for electric equipment, made of the following raw materials in parts by weight: 90 parts of modified epoxy resin, 75 parts of flame retardant, 6 parts of expanded graphite, 7 parts of aluminum silicate fiber, molecular sieve 5 servings. Refer to Example 1 for the composition of the flame retardant and its preparation method. For the preparation method of the fireproof material, please refer to Example 1, and details will not be repeated here.

Comparative example 2: An environment-friendly fireproof material for power equipment, made of the following raw materials in parts by weight: 90 parts of fluorocarbon resin, 75 parts of flame retardant, 6 parts of expanded graphite, 7 parts of aluminum silicate fiber, and 5 parts of molecular sieve . Refer to Example 1 for the composition of the flame retardant and its preparation method. For the preparation method of the fireproof material, please refer to Example 1, and details will not be repeated here.

Comparative example 3: An environment-friendly fireproof material for electric equipment, the preparation raw materials and method are made from the following raw materials in parts by weight: 55 parts of bisphenol A epoxy resin, 35 parts of fluorocarbon resin, 75 parts of flame retardant, expansion 6 parts of graphite, 7 parts of aluminum silicate fiber, and 5 parts of molecular sieve.

Wherein, the flame retardant is made of the ammonium polyphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 3:1:1.5.

For the preparation method, refer to Example 1, and details are not repeated here.

Comparative example 4: An environment-friendly fireproof material for electric equipment, the preparation raw materials and method are made of the following raw materials in parts by weight: 55 parts of modified epoxy resin, 35 parts of fluorocarbon resin, 75 parts of flame retardant, 6 parts of expanded graphite parts, 7 parts of aluminum silicate fibers, and 5 parts of molecular sieves.

Wherein, the flame retardant is made of the tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 2:1:2.

For the preparation method, refer to Example 1, and details are not repeated here.

Comparative example 5: An environment-friendly fireproof material for electric equipment, the preparation raw materials and method are made of the following raw materials in parts by weight: 55 parts of modified epoxy resin, 35 parts of fluorocarbon resin, 75 parts of flame retardant, 6 parts of expanded graphite parts, aluminum silicate fiber 7 parts, titanium dioxide 5 parts. Refer to Example 1 for the composition of the flame retardant and its preparation method. For the preparation method of the fireproof material, please refer to Example 1, and details will not be repeated here.

Comparative example 6: An environment-friendly fireproof material for electric equipment, the preparation raw materials and method are made of the following raw materials in parts by weight: 55 parts of modified epoxy resin, 35 parts of fluorocarbon resin, 75 parts of flame retardant, 6 parts of expanded graphite parts, 7 parts of aluminum silicate fibers, and 5 parts of molecular sieves.

Wherein, the particle size of the expanded graphite is 100 μm.

Refer to Example 1 for the composition of the flame retardant and its preparation method. For the preparation method of the fireproof material, please refer to Example 1, and details will not be repeated here.

Evaluation

Experiment 1. The effect of fireproof materials on the combustion performance of cables

The test is carried out in accordance with the ISO5660-1 standard method. Ordinary YJV cables (blank group) and cables coated with fireproof materials (repeatedly painted 3 times, left to dry for 18 hours, and the thickness of the coating to dry is 1mm) are cut into small sections with a length of 100mm, and placed side by side so that the total width is about 100mm. The back and sides are covered, and a ceramic fiber blanket is placed on the bottom to ensure uniform thermal boundary conditions.

During the test, the sample is placed in a stainless steel frame and heated on the loading platform, a specific thermal radiation power is applied through the conical heater above the loading platform, and the high-voltage electric spark igniter is started at the same time to ignite the sample and measure the data. The test ends when the flame goes out. The radiation intensity is selected as 35kW/m ² , which is used to simulate the radiation heat received by combustibles in a fire.

The test fireproof materials are respectively: the fireproof materials prepared in Examples 1-3, 9 and Comparative Examples 1-5.

The test results are shown in Table 1.

Table 1 Cone calorimeter test results of ordinary YJV cables and cables coated with fireproof materials

Fireproof Materials Ignition time/s Average heat release rate/kW·m ^-2 Total heat release/MJ m ^-2 Average mass loss rate/g·s ^-1 Effective heat of combustion/MJ kg ^-1 Total smoke production/m ³ Example 1 136 51.5 70.25 0.021 18.01 5.93 Example 2 125 52.3 72.21 0.023 18.56 6.10 Example 3 121 52.8 72.45 0.024 18.61 6.23 Example 9 145 48.3 70.01 0.018 17.75 5.63 Comparative example 1 64 109.3 116.3 0.036 26.81 12.01 Comparative example 2 72 87.3 93.5 0.032 23.13 11.32 Comparative example 3 76 85.2 91.3 0.031 21.75 11.03 Comparative example 4 85 78.2 87.6 0.030 21.23 10.56 Comparative example 5 83 76.4 86.1 0.030 21.04 10.12 Comparative example 6 86 77.9 86.8 0.029 21.00 10.41 blank group 35 113.78 126.95 0.038 25.85 13.50

Table 1 shows that under the same radiation intensity, the cables coated with fireproof materials have a longer ignition time than the blank group, and the heat release rate, effective combustion heat and smoke release decrease, reflecting different degrees of fire resistance. As far as cables coated with fireproof materials are concerned, the fireproof performance of the fireproof material prepared by coating Example 9 is the best, followed by Example 1, indicating that the modified epoxy resin obtained by the present invention is more suitable for preparing fireproof materials. The performance of the fireproof material prepared by using a single film-forming material in Comparative Example 1 and Comparative Example 2 is significantly different from that of Example 1. In Comparative Example 3, the fireproof performance of the fireproof material obtained by combining bisphenol A epoxy resin with fluorocarbon resin and changing the composition of the flame retardant is obviously inferior to that of the present invention. The performance of the fireproof material obtained by changing the ratio of flame retardant in Comparative Example 4 is also inferior to that of the present invention. In Comparative Example 5, titanium dioxide was used instead of molecular sieve, and the fire resistance performance decreased. The above experimental results show that the synergistic flame-retardant effect of the various raw materials of the present invention is obvious, and the prepared fire-resistant material is used for cables, and has excellent fire-resistant performance.

Experiment 2. Performance test of fireproof material coated on steel plate

After the cold-rolled steel plate is pretreated, the fireproof materials prepared in Examples 1-3 and 9 and Comparative Examples 1-5 are respectively coated on the surface of the cold-rolled steel plate, the coating thickness is 1.4 ± 0.1 mm, dried naturally, and cured 5 days.

The test piece referred to below refers to the cold-rolled steel plate coated with fireproof material.

1. Anti-crack performance: Put the cold-rolled steel plate coated with fireproof materials in a 5m/s wind field for 12 hours, observe at a distance of 0.5m from the test piece, and visually check whether there are cracks on the surface, and it is qualified if there is no crack.

2. Water resistance: immerse 2/3 of the cold-rolled steel plate coated with fireproof materials in tap water, take out the test piece for observation after 36 hours, if there is no layering, foaming, and falling off, it is qualified.

3. Weather resistance: put the cold-rolled steel plate coated with fireproof material in the air at (23±2)°C for 18 hours, then put the test piece in the low-temperature box at (-20±2)°C, and the temperature in the box reaches Freeze at -18°C for 3 hours, then take the test piece out of the low temperature box, immediately put it in a constant temperature box at (50±2)°C, keep the temperature constant for 3 hours, take out the test piece and repeat the above operation for a total of 20 cycles, if there is no cracking or peeling , foaming phenomenon, it is qualified.

4. Expansion ratio n: record the coating thickness of each cold-rolled steel plate coated with fireproof materials, place two thermocouples on the center and backfired surface of the test piece respectively, test the internal temperature and backfire temperature of the sample plate, and place the sample plate In the test furnace, the size of the gas flame is adjusted so that it can completely cover the sample, and the test starts when the flame temperature reaches 1000°C. The test ends, and the temperature rise rate of the flame in the furnace is as shown in Section 1.1.2 of GB/T9978.1-2008 Standard heating curve for heating. After the test, record the values of the internal temperature and the backfire temperature, observe the combination of the carbon layer and the substrate, and measure the expansion thickness of the carbon layer at three points on the bottom and two sides of the sample, and calculate the expansion ratio n according to the following formula. The expansion ratio of the sample charcoal layer is the average of the expansion ratios of 9 points.

N=(dd ₀ )/d ₀

In the formula, d is the expansion thickness of the carbon layer after the test, and _d0 is the coating thickness before the test.

Table 2 Performance test results of fireproof materials coated on steel plates

Fireproof Materials Crack resistance Water resistance weather resistance Expansion ratio n Example 1 qualified qualified qualified 9.43 Example 2 qualified qualified qualified 9.15 Example 3 qualified qualified qualified 9.23 Example 9 qualified qualified qualified 9.65 Comparative example 1 qualified qualified qualified 5.36 Comparative example 2 qualified qualified unqualified 5.64 Comparative example 3 qualified qualified unqualified 5.03 Comparative example 4 qualified qualified qualified 6.01 Comparative example 5 unqualified qualified qualified 5.92 Comparative example 6 unqualified qualified qualified 6.15

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we have described are only illustrative, rather than used to limit the scope of the present invention. Equivalent modifications and changes made by skilled personnel in accordance with the spirit of the present invention shall fall within the protection scope of the claims of the present invention.

Claims (8)

1. An environmentally friendly fireproof material for electric equipment, characterized in that: it is made of the following raw materials in parts by weight: 50-60 parts of modified epoxy resin, 30-40 parts of fluorocarbon resin, and 60-90 parts of flame retardant , 3~10 parts of expanded graphite, 3~10 parts of aluminum silicate fiber, 2~8 parts of molecular sieve. 2. The environment-friendly fireproof material for power equipment as claimed in claim 1, wherein the flame retardant is composed of tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol in a weight ratio of 4~6:0.5 ~1.5.5: 1.5~3 made. 3. The environment-friendly fireproof material for electric equipment according to claim 1, characterized in that: the flame retardant is 70-80 parts by weight. 4 . The environment-friendly fireproof material for power equipment according to claim 1 , wherein the weight ratio of tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol is 3:1:1.5. 5. The environment-friendly fireproof material for power equipment according to claim 1, characterized in that: the particle size of the expanded graphite is 200-300 μm. 6. A method for preparing an environment-friendly fireproof material for electric equipment, characterized in that: comprising the following steps: Step S1: Weigh 35-70 parts by weight of flame retardant, 3-10 parts of expanded graphite and 3-10 parts of aluminum silicate fiber and mix them vigorously in a high-shear homogenizer until completely uniformly dispersed to obtain a homogeneous material; Step S2: Add the obtained homogeneous material to the premix of 50-60 parts by weight of modified epoxy resin and 30-40 parts by weight of fluorocarbon resin, and stir for 5-12 minutes with a stirrer at a rotating speed of 80-120 r/min Then add 2 to 8 parts by weight of molecular sieves, stir for 45 to 60 minutes with a stirrer with a rotating speed of 900 to 1000 r/min, and dilute to the required concentration with distilled water to obtain a fireproof material. 7. the preparation method of environment-friendly fireproof material for electric equipment as claimed in claim 6, is characterized in that: described flame retardant is obtained by following preparation method: according to tetraphenyl bisphenol A diphosphate, melamine phosphate and The weight ratio of dipentaerythritol is 4~6: 0.5~1.5.5: 1.5~3. Weigh tetraphenyl bisphenol A diphosphate, melamine phosphate and dipentaerythritol respectively, mix them, and shear and stir at 2000~2500r/min 10~15 minutes. 8 . The preparation method of the environment-friendly fireproof material for electric equipment according to claim 6 , wherein the fireproof material is evenly sprayed on the surface of the electric equipment, and the coating thickness is controlled to be 0.5-1.5 mm.