Microencapsulated fire preventing and extinguishing material and preparation method thereof

Abstract

The invention provides a microencapsulated fire preventing and extinguishing material and a preparation method thereof. The microencapsulated fire preventing and extinguishing material comprises a fireproof base layer and a plurality of microencapsulated fire extinguishing particles, wherein the fireproof base layer is filled with the microencapsulated fire extinguishing particles; each microencapsulated fire extinguishing particle comprises a carbonized coating layer and a fire extinguishing core; the carbonization coating layer comprises 10-20 parts by mass of a carbonization expansion wall material; the fire extinguishing core comprises 80-90 parts of a fire extinguishing material; and the carbonized coating layer is carbonized and expanded under the action of flames, and the carbonized and expanded carbonized coating layer can block a gap formed after the fire extinguishing core is released. According to the microencapsulated fire preventing and extinguishing material, a gap after the fire extinguishing core is completely released is blocked, so that the microencapsulated fire preventing and extinguishing material has fire preventing and extinguishing functions at the same time; the utilization rate of the residual carbonized coating layer is increased, and the use amount of the flame retardant is reduced, so that the mechanical property of the microencapsulated fire preventing and extinguishing material is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of fire extinguishing materials, and in particular to a microencapsulated fire extinguishing material and a preparation method thereof. Background Art

[0002] At present, the technology of microcapsule-coated fire extinguishing agent is widely used in fireproof materials, mainly because it can provide an effective way for fireproof materials to realize automatic startup and automatic fire extinguishing, so as to realize effective fire extinguishing function.

[0003] For example, Chinese patent document No. CN 116115947 B discloses a multi-walled microcapsule perfluorohexanone fire extinguishing agent and a preparation method thereof. Another example is Chinese patent document No. CN 106807027 B discloses a microcapsule fire extinguishing agent. Although the fire extinguishing agent is effectively coated by the technology of microcapsule coating the fire extinguishing agent, it is easy to form gaps at the original blocking position after the coated fire extinguishing agent is completely released. If the fire is not extinguished at this time, the remaining microcapsule wall material cannot play a good fireproof blocking role, resulting in flames directly jumping out of the gaps and causing serious problems of flame spread. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a microencapsulated fire-proof material and a preparation method thereof, which can not only seal the gap after the fire extinguishing core is completely released, so that the microencapsulated fire-proof material has both fire prevention and fire extinguishing functions; but also improve the utilization rate of the residual carbonized coating layer, and reduce the use of flame retardants, which is beneficial to improving the mechanical properties of the microencapsulated fire-proof material.

[0005] The purpose of this disclosure is achieved through the following technical solutions:

[0006] A microencapsulated fire extinguishing material comprises a fireproof base layer and a plurality of microencapsulated fire extinguishing particles, wherein each of the microencapsulated fire extinguishing particles is filled in the fireproof base layer; the microencapsulated fire extinguishing particles comprise a carbonized coating layer and a fire extinguishing core; in terms of mass fractions, the carbonized coating layer comprises 10 to 20 parts of carbonized expansion wall material; the fire extinguishing core comprises 80 to 90 parts of fire extinguishing material; the carbonized coating layer undergoes carbonization expansion under the action of a flame, and the carbonized and expanded carbonized coating layer can block the gap after the fire extinguishing core is released.

[0007] In one embodiment, the expansion multiple of the microencapsulated fire extinguishing material is 18.0 to 21 times.

[0008] In one embodiment, the fire extinguishing material includes at least one of perfluorohexanone, carbon dioxide, water, ammonium carbonate and ammonium phosphate.

[0009] In one embodiment, the total mass fraction of each of the microencapsulated fire extinguishing particles is 20 to 35 parts, and the mass fraction of the fireproof base layer is 60 to 90 parts.

[0010] In one embodiment, the fireproof base layer includes the following parts by mass:

[0011]

[0012] In one embodiment, the polymer resin includes at least one of polyurethane resin, silicone resin, epoxy resin and water-based acrylic acid-vinyl acetate copolymer emulsion; and / or,

[0013] The fireproof functional filler includes at least one of expandable graphite, zinc borate, ammonium molybdate, silicate, silicon dioxide, perlite, expanded vermiculite and mica powder; and / or,

[0014] The flame retardant comprises at least one of ammonium polyphosphate, 1,3,5-triazine-2,4,6-triamine, sorbitol, starch, pentaerythritol, aluminum hydroxide, magnesium hydroxide and organic phosphate; and / or,

[0015] The curing agent includes at least one of polymethylene polyphenyl isocyanate, ethyl orthosilicate, methyltriethoxysilane, phenyltriethoxysilane, phenyltrimethyloxysilane, diethylenetriamine and triethylenetetramine.

[0016] In one embodiment, the reaction release temperature of the microencapsulated fire extinguishing material ranges from 105°C to 120°C.

[0017] A method for preparing a microencapsulated fire extinguishing material comprises the following steps:

[0018] Mixing polymer resin, flame retardant and fire-proof functional filler to obtain a premixed fluid;

[0019] After the premixed fluid is cooled to below 40° C., microencapsulated fire extinguishing particles are added to the premixed fluid for mixing to obtain a microencapsulated fire extinguishing material component A;

[0020] The microencapsulated fire extinguishing material component A is mixed with the curing agent component B to obtain the microencapsulated fire extinguishing material described in any of the above embodiments.

[0021] In one embodiment, the microencapsulated fire extinguishing material is cured on a metal plate at normal pressure; or,

[0022] Curing the microencapsulated fire extinguishing material on a fiber fabric at normal pressure; or,

[0023] The microencapsulated fire extinguishing material is injection molded to obtain a multi-form fire extinguishing module.

[0024] In one embodiment, in the step of adding microencapsulated fire extinguishing particles to the premixed fluid for mixing, the mixing operation conditions are: a stirring speed of less than 500 rpm, a vacuum degree of -0.05Mpa to -0.01Mpa, and a stirring time of 10min to 15min.

[0025] Compared with the prior art, the present invention has at least the following advantages:

[0026] 1) By filling a plurality of microencapsulated fire extinguishing particles in the fireproof base layer, the fireproof base layer can provide a basic fireproof framework for the plurality of microencapsulated fire extinguishing particles, and by optimizing the ratio of the carbonized coating layer and the fire extinguishing core of the microencapsulated fire extinguishing particles, that is, the carbonized coating layer includes 10 to 20 parts of carbonized expansion wall material; the fire extinguishing core includes 80 to 90 parts of fire extinguishing material. When the fire extinguishing core is completely released, a plurality of gaps will be formed in the fireproof base layer. If the fire is not extinguished at this time, the remaining carbonized coating layer will undergo carbonization and expansion under the action of the flame, and the carbonized coating layer after carbonization and expansion can block the gaps after the fire extinguishing core is released, so that the remaining carbonized coating layer can effectively block the flame, which not only effectively avoids the problem of flames directly jumping out of the gaps and causing serious flame spread, so as to realize that the microencapsulated fire extinguishing material has both fire prevention and fire extinguishing functions; and improves the utilization rate of the remaining carbonized coating layer.

[0027] 2) Since the use of microencapsulated fire extinguishing particles can effectively reduce the amount of flame retardant used, it is beneficial to improve the mechanical properties of the microencapsulated fire extinguishing material. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a flow chart of a microencapsulated fire extinguishing material according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] The present disclosure provides a microencapsulated fire extinguishing material including a fireproof base layer and a plurality of microencapsulated fire extinguishing particles, wherein each of the microencapsulated fire extinguishing particles is filled in the fireproof base layer; the microencapsulated fire extinguishing particles include a carbonized coating layer and a fire extinguishing core; in terms of mass fractions, the carbonized coating layer includes 10 to 20 parts of carbonized expansion wall material; the fire extinguishing core includes 80 to 90 parts of fire extinguishing material; the carbonized coating layer carbonizes and expands under the action of a flame, and the carbonized and expanded carbonized coating layer can block the gap after the fire extinguishing core is released.

[0034] The above-mentioned microencapsulated fire-proof and extinguishing material is achieved by filling a plurality of microencapsulated fire-extinguishing particles in the fire-proof base layer so that the fire-proof base layer can provide a basic fire-proof framework for the plurality of microencapsulated fire-extinguishing particles, and by optimizing the ratio of the carbonized coating layer and the fire-extinguishing core of the microencapsulated fire-extinguishing particles, that is, the carbonized coating layer includes 10 to 20 parts of carbonized expansion wall material; the fire-extinguishing core includes 80 to 90 parts of fire-extinguishing materials. When the fire-extinguishing core is completely released, a plurality of gaps will be formed in the fire-proof and extinguishing base layer. If the fire is not extinguished at this time, the remaining carbonized coating layer will undergo carbonization and expansion under the action of the flame, and the carbonized coating layer after carbonization and expansion can block the gaps after the fire-extinguishing core is released, so that the remaining carbonized coating layer can effectively block the flame, which not only effectively avoids the flame directly jumping out of the gap and causing the serious problem of flame spreading, so as to realize that the microencapsulated fire-proof and extinguishing material has both fire-proof and fire-extinguishing functions; and improves the utilization rate of the remaining carbonized coating layer. Furthermore, since the use of microencapsulated fire extinguishing particles can effectively reduce the amount of flame retardant used, it is beneficial to improve the mechanical properties of the microencapsulated fire extinguishing material.

[0035] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0036] The microencapsulated fire extinguishing material of one embodiment includes a fireproof base layer and a plurality of microencapsulated fire extinguishing particles, each of the microencapsulated fire extinguishing particles is filled in the fireproof base layer; the microencapsulated fire extinguishing particles include a carbonized coating layer and a fire extinguishing core; in terms of mass percentage, the carbonized coating layer includes 10 to 20 parts of carbonized expansion wall material; the fire extinguishing core includes 80 to 90 parts of fire extinguishing material; the carbonized coating layer carbonizes and expands under the action of flames, and the carbonized and expanded carbonized coating layer can block the gap after the fire extinguishing core is released.

[0037] It can be understood that by filling multiple microencapsulated fire extinguishing particles in the fireproof base layer, the fireproof base layer can provide a basic fireproof framework for the multiple microencapsulated fire extinguishing particles, and by optimizing the ratio of the carbonized coating layer and the fire extinguishing core of the microencapsulated fire extinguishing particles, that is, the carbonized coating layer includes 10 to 20 parts of carbonized expansion wall material; the fire extinguishing core includes 80 to 90 parts of fire extinguishing material. When the fire extinguishing core is completely released, multiple gaps will be formed in the fireproof base layer. If the fire is not extinguished at this time, the remaining carbonized coating layer will carbonize and expand under the action of the flame, and the carbonized coating layer after carbonization and expansion can block the gaps after the fire extinguishing core is released, so that the remaining carbonized coating layer can effectively block the flame, which not only effectively avoids the flame directly jumping out of the gap and causing serious flame spread, so as to realize that the microencapsulated fire extinguishing material has both fire prevention and fire extinguishing functions; and improves the utilization rate of the residual carbonized coating layer.

[0038] It can be understood that if the expansion multiple of the microencapsulated fire extinguishing material is less than 5 times, it cannot be guaranteed that the residual carbonized coating layer can effectively block the gap after the fire extinguishing core is completely released under the action of the flame; if the expansion multiple of the microencapsulated fire extinguishing material is higher than 20 times, the carbonized coating layer under the same unit usage amount will not be able to form a dense carbonized blocking structure, that is, it still cannot effectively block the gap after the fire extinguishing core is completely released. Therefore, in one embodiment, the expansion multiple of the microencapsulated fire extinguishing material is 5 to 20 times to ensure that the residual carbonized coating layer will form a dense carbonized blocking structure under the high temperature of the flame, thereby effectively blocking the gap after the fire extinguishing core is completely released.

[0039] Furthermore, since the use of microencapsulated fire extinguishing particles can effectively reduce the amount of flame retardant used, it is beneficial to improve the mechanical properties of the microencapsulated fire extinguishing material.

[0040] In one embodiment, the carbonized expansion wall material includes at least one of urea-formaldehyde resin, melamine-formaldehyde amino resin and polyurethane to ensure that the microencapsulated fire extinguishing particles will rupture and release the fire extinguishing material under the action of the high temperature of the flame, and to ensure that the added 10 to 20 parts of the carbonized expansion wall material will form a dense carbonized sealing structure under the action of the flame.

[0041] In one embodiment, the fire extinguishing material includes at least one of perfluorohexanone, carbon dioxide, water, ammonium carbonate and ammonium phosphate to ensure that the released fire extinguishing material can effectively suppress the spread of flames, and to ensure that the added 10 to 20 parts of carbonized expanded wall material can effectively cover 80 to 90 parts of fire extinguishing material, thereby ensuring that the prepared microencapsulated fire extinguishing particles can rupture the carbonized coating layer and continuously release the fire extinguishing gas as the flame temperature increases, thereby ensuring the fire extinguishing effect.

[0042] It is understandable that if the proportion of microencapsulated fire extinguishing particles in the fireproof base layer is too low or too high, it cannot be guaranteed that the carbonized coating layer after carbonization and expansion can effectively block the gap after the fire extinguishing core is released. Therefore, in one embodiment, the total mass of each microencapsulated fire extinguishing particle is 20 to 35 parts by mass, and the mass of the fireproof base layer is 60 to 90 parts, so as to ensure that the proportion of multiple microencapsulated fire extinguishing particles in the fireproof base layer is appropriate, thereby ensuring that the carbonized coating layer after carbonization and expansion can effectively block the gap after the fire extinguishing core is released.

[0043] Specifically, in one of the embodiments, the fireproof base layer includes the following parts by mass: 30 to 40 parts of polymer resin; 10 to 15 parts of fireproof functional filler; 10 to 15 parts of flame retardant; 10 to 20 parts of curing agent, so as to ensure that the fireproof base layer has good fireproof and flame retardant properties, and ensure that the added flame retardant materials and fireproof functional fillers can interrupt and delay the thermal decomposition or chain combustion reaction of the material by means of condensed phase or gas phase flame retardancy, thereby reducing and preventing the spread of flames; especially in conjunction with the use of microencapsulated fire extinguishing particles, in the face of fire, to ensure the fire-fighting combined effect of the microencapsulated fire-fighting material, thereby improving the overall fireproof performance of the microencapsulated fire-fighting material, to ensure that the microencapsulated fire-fighting material cannot be directly ignited within 10 seconds, and can also extinguish itself after being burned for a long time with an open flame, proving that the microencapsulated fire-fighting material disclosed in the present invention has good fire-fighting performance.

[0044] It can be understood that the addition of microencapsulated fire extinguishing particles can effectively reduce the amount of flame retardant added in the fireproof base layer, which is conducive to the improvement of the mechanical properties of the microencapsulated fireproof material, thereby ensuring the overall strength of the microencapsulated fireproof material. In addition, due to the good compatibility of the microencapsulated fire-extinguishing particles, the compatibility of the microencapsulated fire-extinguishing particles, polymer resin, fireproof functional filler, flame retardant and curing agent is improved, which is conducive to the preparation of microencapsulated fireproof materials with good structural stability; and the addition of microencapsulated fire-extinguishing particles can quickly respond and release fire-extinguishing materials to achieve rapid and effective fire extinguishing. At the same time, the addition of microencapsulated fire-extinguishing particles ensures that the microencapsulated fireproof material has excellent controlled release performance. As the flame temperature increases, it can continuously release fire-extinguishing materials within a certain period of time to improve fire extinguishing efficiency.

[0045] In one embodiment, the polymer resin includes at least one of polyurethane resin, silicone resin, epoxy resin and aqueous copolymer emulsion to ensure the cross-linking and curing properties of the polymer resin, so that the microencapsulated fire extinguishing particles and fire-retardant fillers and flame retardants can be effectively compounded to form a stable structure.

[0046] The fireproof functional filler includes at least one of expandable graphite, zinc borate, ammonium molybdate, silicate, silicon oxide, perlite, expanded vermiculite and mica powder; in particular, the flame retardant includes at least one of ammonium polyphosphate, 1,3,5-triazine-2,4,6-triamine, sorbitol, starch, pentaerythritol, aluminum hydroxide, magnesium hydroxide and organic phosphate, so as to ensure that the microencapsulated fireproof material disclosed in the present invention has good fireproof performance.

[0047] In one embodiment, the curing agent includes at least one of polymethylene polyphenyl, diethylenetriamine and triethylenetetramine.

[0048] It can be understood that for the blocking structure of the over-line of the building wall, the general probability of fire is usually caused by the flammable sources or equipment in the building, and the high-temperature drippings caused by these flammable sources or equipment will usually splash everywhere to cause a secondary fire in the blocking structure of the over-line of the building wall. If the reaction release temperature range of the microencapsulated fire extinguishing material is lower than 105°C, the microencapsulated fire extinguishing material will start to release the fire extinguishing material at the initial stage of the fire of the flammable source or equipment in the building, and the fire prevention and extinguishing function of the splashing high-temperature drippings cannot be achieved; if the reaction release temperature range of the microencapsulated fire extinguishing material is higher than 120°C, the splashing high-temperature drippings will stay in the blocking structure of the over-line of the building wall for too long, resulting in too large a combustion area of ​​the blocking structure of the over-line of the building wall, thereby increasing the difficulty of fire prevention and extinguishing in the later stage. Therefore, in one of the embodiments, the reaction release temperature range of the microencapsulated fire extinguishing material is 105°C to 120°C, so as to ensure that the reaction release temperature range of the microencapsulated fire extinguishing material is more suitable, so as to achieve rapid activation of high-temperature dripping materials, while also reducing the residence time of splashing high-temperature dripping materials in the blocking structure of the over-line of the building wall, thereby reducing the difficulty of fire prevention and extinguishing in the later stage.

[0049] See also Figure 1 The present disclosure also provides a method for preparing a microencapsulated fire extinguishing material, comprising the following steps: mixing a polymer resin, a flame retardant and a fire retardant functional filler to obtain a premixed fluid; after the premixed fluid is cooled to below 40° C., adding microencapsulated fire extinguishing particles to the premixed fluid for mixing to obtain a microencapsulated fire extinguishing material component A; mixing the microencapsulated fire extinguishing material component A with a curing agent component B to obtain the microencapsulated fire extinguishing material described in any of the above embodiments.

[0050] In order to better understand the technical solution and beneficial effects of the present disclosure, the present disclosure is further described in detail below in conjunction with specific embodiments: A method for preparing a microencapsulated fire extinguishing material in one embodiment comprises the following steps:

[0051] S101, mixing polymer resin, flame retardant and fire-proof functional filler to obtain a premixed fluid for standby use.

[0052] In one embodiment, 30 to 40 parts of a polymer resin are placed in a concentric double-shaft vacuum mixer, and then vacuum heated to 50°C to 70°C to pretreat the polymer resin, thereby reducing the viscosity of the resin fluid and removing small molecular substances in the resin, such as water molecules; then, the vacuum degree of the concentric double-shaft vacuum mixer is maintained at -0.055Mpa to -0.085Mpa, the temperature adjustment range is 60°C to 100°C, and high-speed dispersion stirring is maintained for 120min to 150min, and the stirring speed is 600 rpm to 800 rpm; then, the concentric double-shaft vacuum mixer is added 10 to 15 parts of flame retardant; then, maintain the vacuum degree at -0.055Mpa to -0.085Mpa, the temperature adjustment range at 60℃ to 100℃, maintain high-speed dispersion for 30min to 50min, and the stirring speed at 600 rpm to 800 rpm; then, add 10 to 15 parts of fire-retardant functional filler into the concentric double-shaft vacuum mixer, maintain the vacuum degree at -0.055Mpa to -0.085Mpa, the temperature at 60℃ to 100℃, continue high-speed dispersion for 30min to 50min, and the rotation speed at 800 rpm to 1000 rpm to obtain a premixed fluid.

[0053] S102, after the premixed fluid is cooled to below 40°C, microencapsulated fire extinguishing particles are added to the premixed fluid for mixing to obtain a microencapsulated fire extinguishing material component A.

[0054] It is understood that if the temperature of the premixed fluid is higher than 40° C., the carbonized coating layer of the microencapsulated fire extinguishing particles will be likely to rupture at a higher temperature. Therefore, in one embodiment, by cooling the premixed fluid to below 40° C. and then adding the microencapsulated fire extinguishing particles to the premixed fluid for mixing, the probability of the microencapsulated fire extinguishing particles rupturing in step S102 is effectively reduced.

[0055] It can be understood that if the mixing conditions of the microencapsulated fire extinguishing particles and the premixed fluid remain the same as the mixing conditions of S101, the microencapsulated fire extinguishing particles will be prone to rupture. Therefore, in one embodiment, in the step of adding the microencapsulated fire extinguishing particles to the premixed fluid for mixing, the conditions of the mixing operation are: the stirring speed is below 500 rpm, the vacuum degree is -0.05Mpa to -0.01Mpa, and the stirring time is 10min to 15min. By reducing the stirring speed, vacuum degree and stirring time at the same time, under the condition of achieving full mixing of the microencapsulated fire extinguishing particles and the premixed fluid, the probability of rupture of the microencapsulated fire extinguishing particles when mixing with the premixed fluid can be further reduced, thereby ensuring that the microencapsulated fire extinguishing material finally prepared has good fire extinguishing performance.

[0056] S103, mixing the microencapsulated fire extinguishing material component A with the curing agent component B, so that the microencapsulated fire extinguishing material component A and the curing agent component B can be cured to form a corresponding shape, thereby obtaining the microencapsulated fire extinguishing material described in any of the above embodiments.

[0057] The above-mentioned method for preparing microencapsulated fire extinguishing material effectively reduces the probability of microencapsulated fire extinguishing particles rupturing in step S102 by cooling the premixed fluid to below 40°C and then adding microencapsulated fire extinguishing particles to the premixed fluid for mixing. In particular, the mixing conditions of the microencapsulated fire extinguishing particles and the premixed fluid: the stirring speed is below 500 rpm, the vacuum degree is -0.05Mpa to -0.01Mpa, and the stirring time is 10min to 15min, so as to better reduce the probability of microencapsulated fire extinguishing particles rupturing in step S102, thereby ensuring that the finally prepared microencapsulated fire extinguishing material has good fire extinguishing performance.

[0058] In order to ensure that microencapsulated fire-proof composite materials of different structural shapes are prepared, in one embodiment, the microencapsulated fire-proof composite materials are cured on a metal plate at normal pressure to obtain the microencapsulated fire-proof composite materials. Specifically, the metal plate is a galvanized steel plate or a 304 stainless steel plate.

[0059] For example, in some other embodiments, the microencapsulated fire extinguishing material is cured on a fiber fabric at normal pressure to obtain a microencapsulated fire extinguishing composite coiled material. Specifically, the fiber fabric includes glass fiber cloth and basalt fiber cloth.

[0060] In one embodiment, when the microencapsulated fire extinguishing material is cured on the fiber fabric at normal pressure, the following specific steps are included: at room temperature, the microencapsulated fire extinguishing material is coated on the fiber fabric, and the thickness during coating is controlled to be no more than 5 mm, and then cured at normal pressure to obtain a microencapsulated fire extinguishing composite coil. During coating, the flatness of the coating process is ensured, which is conducive to preparing a light, thin, fire extinguishing, and easy-to-roll microencapsulated fire extinguishing composite coil.

[0061] For example, in some other embodiments, the microencapsulated fire extinguishing material is injection molded to obtain a multi-form fire extinguishing module to better suit the blocking structure of the cross-line of an irregular-shaped building wall.

[0062] For example, in some other embodiments, the microencapsulated fire extinguishing material component A and the curing agent component B are respectively filled into a two-component rubber hose to obtain a microencapsulated fire extinguishing sealant with two-component reactivity having fire extinguishing function.

[0063] It is worth mentioning that in the present disclosure, the temperatures during normal pressure curing, injection molding and filling operations are all at room temperature of 25°C to 40°C to reduce the probability of damage to the microencapsulated fire extinguishing material.

[0064] Some specific examples are given below, and if % is mentioned, it means percentage by weight. It should be noted that the following examples do not exhaust all possible situations, and the materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0065] Among them, encapsulated fire extinguishing particles are provided by Guangdong Heiwei Fire Protection Technology Co., Ltd.; polyurethane resin 330N is provided by Tianjin Petrochemical Plant No. 3; silicone resin 107 is provided by Guangzhou Jucheng Zhaoye Silicone Raw Materials Co., Ltd.; epoxy resin BYDB 450 is provided by Dalian Qihua Chemical Co., Ltd.; water-based copolymer emulsion is provided by Dow Chemical Company; fire-retardant functional fillers are commercially available products; flame retardants are provided by Klein Chemical (China) Co., Ltd.; polymethylene polyphenyl isocyanate is provided by Bayer.

[0066] Table 1 Fireproof Base Formula

[0067]

[0068]

[0069] Table 2 Formulation of microencapsulated fire extinguishing particles

[0070]

[0071] The formulations of Examples 1 to 3 were prepared according to the following steps:

[0072] S1. Place the polymer resin in the formula of Table 1 above in a concentric double-shaft vacuum mixer, and then vacuum heat it to 65° C. to pretreat the polymer resin; and maintain the vacuum degree of the concentric double-shaft vacuum mixer at -0.085 MPa, the temperature at 100° C., and maintain the speed of 800 rpm for 120 min of dispersion stirring;

[0073] S2. Add the flame retardant in the formula of Table 1 into the concentric double-shaft vacuum mixer; then, maintain the vacuum degree at -0.085 MPa, the temperature at 80° C., and maintain the high-speed dispersion at 700 rpm for 30 min;

[0074] S3, add the fire-retardant functional filler in the formula of Table 1 into a concentric double-shaft vacuum mixer, maintain a vacuum degree of 0.085 MPa, a temperature of 80° C., and continue high-speed dispersion at a speed of 1000 rpm for 30 min to obtain a premixed fluid;

[0075] S4, after the premixed fluid in step S3 is cooled to below 40° C., the microencapsulated fire extinguishing particles in Table 1 are added to the premixed fluid for mixing, the stirring speed is 300 rpm, the vacuum degree is -0.05 MPa, and the stirring time is 10 min to obtain the microencapsulated fire extinguishing material component A; wherein the microencapsulated fire extinguishing particles are prepared according to the formula in Table 2;

[0076] S5, mixing the microencapsulated fire extinguishing material component A of step S4 with the curing agent component B in Table 1 to obtain a microencapsulated fire extinguishing material;

[0077] S6. At room temperature of 28° C., the microencapsulated fire extinguishing material of step S5 is coated on one side of the glass fiber cloth to form a microencapsulated fire extinguishing layer with a thickness of 5 mm on the glass fiber cloth, and then cured at normal pressure to obtain a microencapsulated fire extinguishing composite coil.

[0078] Comparative Example 1

[0079] The difference from Example 1 is that 30 kg of microencapsulated fire extinguishing particles are directly replaced with 10 kg, and the rest remain unchanged.

[0080] Comparative Example 2

[0081] The difference from Example 1 is that 30 kg of microencapsulated fire extinguishing particles are directly replaced with 15 kg, and the rest remain unchanged.

[0082] Comparative Example 3

[0083] The difference from Example 1 is that 30KG of microencapsulated fire extinguishing particles is directly replaced with 35KG, and the rest remains unchanged.

[0084] Comparative Example 4

[0085] The difference from Example 1 is that 30 kg of microencapsulated fire extinguishing particles are directly replaced with 40 kg, and the rest remain unchanged.

[0086] Comparative Example 5

[0087] The difference from Example 1 is that ammonium polyphosphate, 1,3,5-triazine-2,4,6-triamine and microencapsulated fire extinguishing particles are not added directly, and the rest remain unchanged.

[0088] Comparative Example 6

[0089] The difference from Example 1 is that ammonium polyphosphate and 1,3,5-triazine-2,4,6-triamine are not added directly, and the rest remain unchanged.

[0090] Comparative Example 7

[0091] The difference from Example 1 is that ammonium polyphosphate is not added directly, and the rest remains unchanged.

[0092] Comparative Example 8

[0093] The difference from Example 1 is that 5KG of ammonium polyphosphate is directly replaced with 2.5KG of ammonium polyphosphate, and the rest remains unchanged.

[0094] Comparative Example 9

[0095] The difference from Example 1 is that the premixed fluid in step S3 is cooled to below 40° C. and directly changed to 42° C., and the rest remain unchanged.

[0096] Comparative Example 10

[0097] The difference from Example 1 is that the vacuum degree in step S3 is changed from -0.05 MPa to -0.85 MPa, and the rest remains unchanged.

[0098] Comparative Example 11

[0099] The difference from Example 1 is that the 300 rpm in step S3 is replaced with 600 rpm, and the rest remains unchanged.

[0100] The microencapsulated fire-proof composite coils (hereinafter referred to as samples) prepared in the above Examples 1 to 3 and Comparative Examples 1 to 11 were tested for flame retardancy, expansion ratio and combustion performance, and the experimental data in Table 3 below were obtained:

[0101] Table 3 Experimental data

[0102]

[0103]

[0104] It can be seen from Examples 1 to 3 and Comparative Examples 1 to 4 in Table 3 above that when 20 to 35 parts of microencapsulated fire extinguishing particles are compounded with 60 to 90 parts of fireproof base layers, the added microencapsulated fire extinguishing particles are not only beneficial to improving the expansion performance of the microencapsulated fireproof composite coil, but also improve the flame retardant properties and mechanical properties of the microencapsulated fireproof composite coil; among them, the comprehensive index of Example 1 is the best.

[0105] It can be seen from the above table 3 that when the flame retardant and the microencapsulated fire extinguishing particles are not added to the comparative example 5, the flame retardant performance of the sample is easy to burn. After the microencapsulated fire extinguishing particles are added alone, such as in comparative example 6, the flame retardant performance of the sample is greatly improved, that is, it reaches the V-0 level, and it cannot be directly ignited, indicating that the fire extinguishing material released by the microencapsulated fire extinguishing particles has a significant inhibitory effect on the flame through the gas phase flame retardant. However, after burning with an open flame for 5 minutes, the sample is ignited after the release of the microencapsulated fire extinguishing particles ends, indicating that the fire extinguishing performance of the microencapsulated fire extinguishing particles is effective for a certain period of time; when the amount of flame retardant does not reach 10 parts, such as in comparative examples 7-8, the sample is ignited within 10 seconds, and self-extinguishes within 30 seconds after leaving the fire, with dripping matter, And there is a hidden danger of igniting the cotton pad, which shows that the flame retardant effect of comparative examples 7 to 8 is not good; when the amount of flame retardant reaches 10 to 15 parts, especially with the use of 20 to 35 parts of microencapsulated fire extinguishing particles, such as Examples 1 to 3, it is ensured that the two play a synergistic role, that is, the flame retardant performance of the sample reaches V-0 level, the sample cannot be directly ignited within 10 seconds and no dripping is produced, and it can be self-extinguished after being burned with an open flame for 1 minute, which proves that the synergistic effect of the flame retardant and the microencapsulated fire extinguishing particles has a positive effect on the flame retardant performance, and the microencapsulated fire extinguishing particles can effectively reduce the amount of flame retardant added in the sample, which is beneficial to improving the mechanical properties of the microencapsulated fire-proof composite coil, that is, improving the structural strength of the microencapsulated fire-proof composite coil.

[0106] It can be seen from the above Table 3 that by controlling the stirring speed of step S3 to be less than 500 rpm, the vacuum degree to be -0.05 MPa to -0.01 MPa, the stirring time to be 10 min to 15 min, and the premixed fluid to be cooled to below 40° C., the probability of rupture of the microencapsulated fire extinguishing particles and affecting the finally prepared microencapsulated fire extinguishing material with good fire extinguishing performance can be reduced, so that the flame retardant properties and combustion performance of comparative examples 9 to 11 are worse than those of embodiment 1.

[0107] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A microencapsulated fire extinguishing material, comprising a fireproof base layer and a plurality of microencapsulated fire extinguishing particles, characterized in that: Each of the microencapsulated fire extinguishing particles is filled in the fireproof base layer; the microencapsulated fire extinguishing particles include a carbonized coating layer and a fire extinguishing core; in terms of mass percentage, the carbonized coating layer includes 10 to 20 parts of carbonized expansion wall material; the fire extinguishing core includes 80 to 90 parts of fire extinguishing material; the carbonized coating layer undergoes carbonization and expansion under the action of flames, and the carbonized coating layer after carbonization and expansion can block the gap after the fire extinguishing core is released.

2. The microencapsulated fire extinguishing material according to claim 1, characterized in that: The expansion multiple of the microencapsulated fire extinguishing material is 5 to 20 times.

3. The microencapsulated fire extinguishing material according to claim 1, characterized in that: The fire extinguishing material includes at least one of perfluorohexanone, carbon dioxide, water, ammonium carbonate and ammonium phosphate.

4. The microencapsulated fire extinguishing material according to claim 1, characterized in that: In terms of mass fractions, the total mass fraction of the microencapsulated fire extinguishing particles is 20 to 35 parts, and the mass fraction of the fireproof base layer is 60 to 90 parts.

5. The microencapsulated fire extinguishing material according to claim 4, characterized in that: The fireproof base layer includes the following parts by mass:

6. The microencapsulated fire extinguishing material according to claim 5, characterized in that: The polymer resin includes at least one of polyurethane resin, silicone resin, epoxy resin and water-based acrylic acid-vinyl acetate copolymer emulsion; and / or, The fireproof functional filler includes at least one of expandable graphite, zinc borate, ammonium molybdate, silicate, silicon dioxide, perlite, expanded vermiculite and mica powder; and / or, The flame retardant comprises at least one of ammonium polyphosphate, 1,3,5-triazine-2,4,6-triamine, sorbitol, starch, pentaerythritol, aluminum hydroxide, magnesium hydroxide and organic phosphate; and / or, The curing agent includes at least one of polymethylene polyphenyl isocyanate, ethyl orthosilicate, methyltriethoxysilane, phenyltriethoxysilane, phenyltrimethyloxysilane, diethylenetriamine and triethylenetetramine.

7. The microencapsulated fire extinguishing material according to claim 1, characterized in that: The reaction release temperature range of the microencapsulated fire extinguishing material is 105°C to 120°C.

8. A method for preparing a microencapsulated fire extinguishing material, characterized in that: The steps include: Mixing polymer resin, flame retardant and fire-proof functional filler to obtain a premixed fluid; After the premixed fluid is cooled to below 40° C., microencapsulated fire extinguishing particles are added to the premixed fluid for mixing to obtain a microencapsulated fire extinguishing material component A; The microencapsulated fire extinguishing material component A is mixed with the curing agent component B to obtain the microencapsulated fire extinguishing material according to any one of claims 1 to 7.

9. The method for preparing a microencapsulated fire extinguishing material according to claim 8, characterized in that: Solidifying the microencapsulated fire extinguishing material on a metal plate at normal pressure; or, Curing the microencapsulated fire extinguishing material on a fiber fabric at normal pressure; or, The microencapsulated fire extinguishing material is injection molded to obtain a multi-form fire extinguishing module.

10. The method for preparing a microencapsulated fire extinguishing material according to claim 8, characterized in that: In the step of adding the microencapsulated fire extinguishing particles to the premixed fluid for mixing, the mixing operation conditions are: a stirring speed of less than 500 rpm, a vacuum degree of -0.05 MPa to -0.01 MPa, and a stirring time of 10 min to 15 min.

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