CN111346325B - Fireproof blanket capable of controlling temperature and preventing fire in different temperature areas, preparation method thereof, cable and cable connector - Google Patents
Fireproof blanket capable of controlling temperature and preventing fire in different temperature areas, preparation method thereof, cable and cable connector Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B25/047—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of particles
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C8/00—Hand tools or accessories specially adapted for fire-fighting, e.g. tool boxes
- A62C8/06—Fire-blankets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B32B38/00—Ancillary operations in connection with laminating processes
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/19—Alkali metal aluminosilicates, e.g. spodumene
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
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- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
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- B32B2264/104—Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
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- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
- B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3409—Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
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Abstract
The invention discloses a fireproof blanket capable of controlling temperature and preventing fire at different temperature areas, a cable joint and a preparation method of the fireproof blanket, wherein the fireproof blanket comprises double insulating layers, powder materials are filled between the double insulating layers, and the powder materials comprise the following components: hydroxide, carbonate, phosphate, argil, zinc borate, boric acid, a dispersing aid and fireproof temperature control powder; the fireproof temperature control powder comprises ceramic powder and at least one of magnesium silicate, calcium sulfate dihydrate, kaolin, calcium silicate and derivatives thereof; the ceramic powder is prepared from a ceramic silicon rubber ceramic material, and the ceramic silicon rubber ceramic material comprises methyl vinyl silicone rubber, silicone oil, white carbon black, diatomite, mica powder, spherical zinc borate and boric acid in parts by weight. The technical scheme of the invention can realize the fire-proof temperature control function by the synergistic effect of gradual dehydration heat absorption, decomposition heat absorption and ceramic heat insulation at different temperatures, and the temperature control range of a temperature zone is from 100 ℃ to 1300 ℃.
Description
Technical Field
The invention relates to the technical field of fireproof materials, in particular to a fireproof blanket capable of controlling temperature and preventing fire at different temperature areas, a preparation method of the fireproof blanket, a cable and a cable joint.
Background
With the popularization of power cables, a plurality of cables in loops are arranged in each cable tunnel, the cables in the cable tunnels are densely arranged, and when an accident happens to one joint, open fire or high-temperature burning can be generated to cause chain reaction of nearby cables, so that a plurality of cable lines are in failure, further fire is caused, and serious accident consequences are caused. Even if open fire is not generated, the temperature of the wire core can reach 90 ℃ when the cable runs for a long time, and the cable outer sheath is always in a high-temperature environment in the underground passage in which a plurality of cables are densely arranged, so that the service life of the cable can be shortened.
The existing fireproof blanket only has a first-level fireproof cooling effect, when the temperature is low, or after the temperature is continuously increased (the temperature exceeds 500 ℃), the heat absorption and cooling effects of the powder can disappear, the temperature control of different temperature zones can not be realized, and the fireproof effect is limited.
In the Chinese patent CN110354414, fire is prevented in the form of cable fire-proof wrapping sheets made of fire-proof sand wrapped by glass fiber cotton, and the method only has the function of heat insulation, but does not dynamically cool and control temperature after the temperature rises.
Disclosure of Invention
The invention mainly aims to provide a fireproof blanket capable of controlling temperature and preventing fire at different temperature areas, a cable joint and a preparation method of the fireproof blanket, and aims to prolong the service life of the cable.
In order to achieve the purpose, the invention provides a fireproof blanket, which comprises double insulating layers, wherein a powder material is filled between the double insulating layers, and the powder material comprises the following components in parts by weight:
the fireproof temperature control powder comprises the following components in parts by weight;
the ceramic powder is prepared from a ceramic silicon rubber ceramic material, and the ceramic silicon rubber ceramic material comprises the following components in parts by weight:
in one embodiment, the powder material comprises the following components in parts by weight:
in one embodiment, the hydroxide includes magnesium hydroxide and aluminum hydroxide.
In one embodiment, the carbonate comprises at least one of calcium carbonate, magnesium carbonate, sodium bicarbonate; the dispersing aid is zinc stearate and/or stearic acid.
In one embodiment, the phosphate comprises at least one of dibasic calcium phosphate dihydrate, dibasic sodium phosphate heptahydrate.
In one embodiment, the double-layer insulating layer is a silicon rubber fire-resistant flexible layer.
In order to achieve the above object, the present invention further provides a cable, which includes a wire core, a sheath, and a fire blanket capable of controlling temperature and preventing fire at different temperature regions, wherein the sheath covers the wire core, the fire blanket includes two insulating layers, and a powder material is filled between the two insulating layers, wherein the powder material includes the following components by weight:
the fireproof temperature control powder comprises the following components in parts by weight;
the ceramic powder is prepared from a ceramic silicon rubber ceramic material, and the ceramic silicon rubber ceramic material comprises the following components in parts by weight:
the fire blanket loops around at least a portion of the sheath.
In order to achieve the above object, the present invention further provides a cable, which includes a wire core and a fire blanket capable of controlling temperature and preventing fire at different temperature regions, wherein the fire blanket includes two insulation layers, and a powder material is filled between the two insulation layers, and the powder material includes the following components by weight:
the fireproof temperature control powder comprises the following components in parts by weight;
the ceramic powder is prepared from a ceramic silicon rubber ceramic material, and the ceramic silicon rubber ceramic material comprises the following components in parts by weight:
the fireproof blanket capable of controlling temperature and preventing fire at different temperature areas coats the wire core.
In order to achieve the above object, the present invention further provides a cable joint, which includes a joint body, a sheath and a fire blanket capable of controlling temperature and preventing fire at different temperature regions, wherein the fire blanket includes two insulating layers, and a powder material is filled between the two insulating layers, and the powder material includes the following components by weight:
the fireproof temperature control powder comprises the following components in parts by weight;
the ceramic powder is prepared from a ceramic silicon rubber ceramic material, and the ceramic silicon rubber ceramic material comprises the following components in parts by weight:
the fireproof blanket is wrapped on the periphery of the sheath.
In order to achieve the above object, the present invention further provides a cable joint, which includes a joint body and a fire blanket capable of controlling temperature and preventing fire at different temperature regions, wherein the fire blanket includes two insulating layers, and a powder material is filled between the two insulating layers, and the powder material includes the following components by weight:
the fireproof temperature control powder comprises the following components in parts by weight;
the ceramic powder is prepared from a ceramic silicon rubber ceramic material, and the ceramic silicon rubber ceramic material comprises the following components in parts by weight:
the fire blanket covers the joint body.
In order to achieve the above object, the present invention further provides a method for preparing a fire blanket, comprising the following steps:
preparing porcelain powder: mixing 100 parts by weight of methyl vinyl silicone rubber, 1-10 parts by weight of silicone oil, 40-65 parts by weight of white carbon black, 75-85 parts by weight of diatomite, 100-135 parts by weight of mica powder, 50-75 parts by weight of spherical zinc borate, 2-10 parts by weight of boric acid and 0-20 parts by weight of a refractory agent, putting into a high-temperature converter, heating to 1100 plus materials and 1300 ℃ for vitrification for 2-3h, preserving heat for 20-40 min, taking out after completion, then crushing the vitrified block objects, and grinding by a ball mill to obtain vitrified powder;
preparing fire-proof temperature control powder: mixing 20-40 parts of porcelainized powder, 10-30 parts of magnesium silicate, 80-120 parts of calcium sulfate dihydrate, 0-20 parts of kaolin and 0-30 parts of calcium silicate or derivatives thereof according to parts by weight to obtain fireproof temperature control powder;
preparation of powder material: mixing 40-80 parts of hydroxide, 40-80 parts of carbonate, 30-90 parts of phosphate, 10-30 parts of argil, 5-15 parts of zinc borate, 5-10 parts of boric acid, 1-5 parts of dispersing aid and 120-160 parts of fireproof temperature control powder according to parts by weight to obtain a powder material;
the powder material is laid in the middle of the silicon rubber fireproof flexible layer with a double-layer structure and then sewn into a blanket, and the fireproof blanket capable of controlling temperature and preventing fire at different temperature areas is obtained.
In one embodiment, the carbonate comprises at least one of calcium carbonate, magnesium carbonate, sodium bicarbonate; the dispersing aid is zinc stearate and/or stearic acid; hydroxides include magnesium hydroxide and aluminum hydroxide; the phosphate comprises at least one of dibasic calcium phosphate dihydrate and dibasic sodium phosphate heptahydrate.
The invention provides a fireproof blanket capable of controlling temperature at different temperature regions, which can realize the fireproof temperature control function by the synergistic effects of gradual dehydration heat absorption, decomposition heat absorption and ceramic heat insulation at different temperatures, wherein the temperature control range of the temperature regions is from below 100 ℃, 300 ℃ and 500 ℃ and 600 ℃ plus materials and 800 ℃ to 1000-1300 ℃.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a fireproof blanket capable of controlling temperature and preventing fire at different temperature areas and a preparation method thereof.
The cable includes a wire core and a fire blanket that encases the wire core.
The cable connector comprises a cable connector body and a fireproof blanket, wherein the fireproof blanket is coated on the periphery of the connector body.
In order to test the fire-proof effect of the fire blanket, the following test methods are adopted:
cutting a 1.5-meter-long high-voltage 110kv cable, tightly attaching a temperature sensor contact to the outer sheath of the 110kv high-voltage cable, wrapping a fireproof temperature control blanket on the cable sheath, so that the temperature sensor is positioned in the middle of the fireproof temperature control blanket, heating the set of experimental device to different temperatures of a table, and testing the temperature rise condition of the surface of the outer sheath of the cable within 1 h.
Example 1(1#)
According to the weight parts, 100 parts of methyl vinyl silicone rubber, 8 parts of silicone oil, 45 parts of white carbon black, 75 parts of diatomite, 100 parts of mica powder, 60 parts of zinc borate and 7 parts of boric acid are put into a high-temperature converter, heated to 1250 ℃ for vitrification for 3 hours, kept warm for 30 minutes, taken out after the vitrification is finished, and then the vitrified block is smashed and ground by a ball mill to obtain vitrified powder.
According to the weight portion, 30 portions of ceramic powder, 20 portions of magnesium silicate, 100 portions of calcium sulfate dihydrate, 10 portions of kaolin and 10 portions of calcium silicate are mixed to form the fireproof temperature control powder. It should be noted that the portion of the porcelain powder taken here is not the same unit amount (may be the same or different) as the portion of the above-mentioned methyl vinyl silicone rubber.
35 parts of magnesium hydroxide, 40 parts of aluminum hydroxide, 30 parts of sodium bicarbonate, 50 parts of calcium hydrophosphate, 8515 parts of argil sillitin N, 8 parts of zinc borate, 5 parts of boric acid, 2 parts of zinc stearate and 140 parts of fireproof temperature control powder are mixed to obtain the powder material. It should be noted that the proportion of the fire-proof temperature-control powder and the proportion of the ceramization powder are not the same unit measurement (may be the same or different).
The powder material is laid in the middle of the silicon rubber fireproof flexible layer with a double-layer structure and then sewn into a blanket, and the fireproof blanket capable of controlling temperature and preventing fire at different temperature areas is obtained.
The parameters of the components were adjusted as described above to obtain examples 2 to 18; and adjusting the parameters according to the method to obtain a blank embodiment 1 and a blank embodiment 2; the specific parameters are shown in the following table:
TABLE 1 composition table of preparation materials used in examples 1 to 10 of the present invention
TABLE 1
TABLE 1
TABLE 2 fireproof temperature control test example
For the above table 1, it should be noted that the ceramic powder, the fire-proof temperature control powder and the powder material are in a sequential dependency relationship, and the ceramic powder in the first column of the table is the ceramic powder in the horizontal column where the fire-proof temperature control powder is located; in the first column of the watch, the fire-proof temperature control powder is the fire-proof temperature control powder in the horizontal column where the powder material is located.
As can be seen from the above table 1, in the process of increasing the ambient temperature from 100 ℃ to 1100 ℃, the temperature of the surface of the cable sheath is increased to 20-100 ℃, the temperature of the surface of the cable sheath is greatly reduced, and the service life of the cable is prolonged. It can be seen from examples 2, 3, 6, 12, 13 and 16 that the temperature rise of the cable sheath surface is relatively low (about 90 ℃) when the ambient temperature rises to 1100 ℃, and the specific gravity of the fireproof temperature-control powder is high in examples 2, 3, 6, 12, 13 and 16. Therefore, the specific gravity of the fireproof temperature control powder is preferably higher, and the specific gravity is preferably 140 to 160 parts.
Further, it can be seen from examples 1 to 18 that when the specific gravity of the hydroxide (60 to 80 parts), the carbonate (60 to 80 parts), the phosphate (60 to 80 parts) and the zinc borate (10 to 15 parts) is high, the temperature rise of the cable jacket surface is relatively low (35 ℃) when the ambient temperature is 500 ℃.
For the hydroxides, which are of a wide variety and have a high decomposition temperature for sodium hydroxide and calcium hydroxide, the endothermic decomposition is not favored, and in preferred embodiments, the hydroxides include magnesium hydroxide and aluminum hydroxide.
Further, the carbonate comprises at least one of calcium carbonate, magnesium carbonate, sodium carbonate and sodium bicarbonate; the dispersing aid is zinc stearate and/or stearic acid.
Still further, the phosphate comprises at least one of dibasic calcium phosphate dihydrate and dibasic sodium phosphate heptahydrate. The reason for selecting the two phosphates is mainly to consider the decomposition temperature, and the desorption heat is generated when the temperature is 300-500 ℃.
The invention provides a fireproof blanket capable of controlling temperature at different temperature regions and a preparation method thereof, wherein the fireproof blanket can achieve the fireproof temperature control effect within the temperature region temperature control range from below 100 ℃, 300 ℃ and 500 ℃, 600 ℃ and 800 ℃ to 1000-1300 ℃ through the synergistic effects of gradual dehydration heat absorption, decomposition heat absorption and ceramic heat insulation at different temperatures.
Compared with the prior art, the method has the following beneficial effects:
1. the silicon rubber fireproof flexible layer has a certain heat insulation and heat conduction effect at a low temperature of about 100 ℃, and can prevent the initial temperature from rapidly rising.
2. The added sodium bicarbonate, calcium hydrophosphate, gypsum powder and other substances can absorb heat in an extremely low temperature region below 100 ℃ and an extremely low temperature region below 200 ℃, so that the fire blanket can play a role in controlling the temperature at the extremely low temperature even under the condition that a fire disaster is not generated, the environmental aging of the cable is improved, and the benign operation of the cable is promoted.
3. In the medium temperature range of 300-500 ℃, the added zinc borate and boric acid can form a glass state inorganic expansion layer to cover the powder, thereby blocking combustion and promoting the formation of carbon by the polymer, and simultaneously the added hydroxide and a reaction product generated after the crystal water is lost in the first stage can be decomposed in an endothermic way to generate gas, thereby having the functions of forming carbon, isolating, foaming and diluting combustible gas.
4. After the temperature rises, the added ceramic powder is further sintered and fused into a whole in the temperature range of 600-800 ℃ and above, reaction products generated in the first two stages are wrapped in the ceramic powder, meanwhile, the added calcium carbonate, pottery clay N85 and the like absorb heat, and carbon dioxide gas released by decomposition promotes the formation of a foamed ceramic body to isolate oxygen, so that the effects of flame retardance, heat insulation, coordinated cooling and fire prevention are achieved.
For the cable and the cable joint, the fire blanket can be directly coated on the cable core, or the fire blanket can be directly coated on the joint body.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention in the specification or other related fields directly or indirectly are included in the scope of the present invention.
Claims (9)
1. The fireproof blanket capable of controlling temperature and preventing fire at different temperature areas comprises double insulating layers, and is characterized in that a powder material is filled between the double insulating layers, wherein the powder material comprises the following components in parts by weight:
the carbonate comprises at least one of calcium carbonate, magnesium carbonate, sodium carbonate and sodium bicarbonate;
the fireproof temperature control powder comprises the following components in parts by weight;
the ceramic powder is prepared from a ceramic silicon rubber ceramic material, and the ceramic silicon rubber ceramic material comprises the following components in parts by weight:
the double-layer insulating layer is a silicon rubber fireproof flexible layer.
2. The fire blanket capable of controlling temperature and preventing fire at different temperature areas according to claim 1, wherein the powder material comprises the following components in parts by weight:
3. the fire blanket capable of controlling temperature and fire at different temperature areas according to claim 2, wherein the hydroxide comprises magnesium hydroxide and aluminum hydroxide.
4. The fire blanket with temperature-controllable fire protection at different temperature ranges according to claim 3, wherein the dispersing aid is zinc stearate and/or stearic acid.
5. The fire blanket capable of controlling temperature and fire at different temperature regions according to claim 4, wherein the phosphate comprises at least one of dibasic calcium phosphate dihydrate and dibasic sodium phosphate heptahydrate.
6. A cable comprising a core and a sheath, said sheath covering said core, further comprising a fire blanket capable of controlling temperature and fire at different temperature regions according to any one of claims 1 to 5, said fire blanket surrounding at least a portion of said sheath.
7. A cable joint, comprising a joint body and a sheath, wherein the sheath coats the joint body, and the cable joint is characterized by further comprising the fireproof blanket capable of controlling temperature and preventing fire at different temperature regions according to any one of claims 1 to 5, wherein the fireproof blanket coats the periphery of the sheath.
8. A preparation method of a fireproof blanket capable of controlling temperature and preventing fire at different temperature areas is characterized by comprising the following steps:
preparing porcelain powder: mixing 100 parts by weight of methyl vinyl silicone rubber, 1-10 parts by weight of silicone oil, 40-65 parts by weight of white carbon black, 75-85 parts by weight of diatomite, 100-135 parts by weight of mica powder, 50-75 parts by weight of spherical zinc borate, 2-10 parts by weight of boric acid and 0-20 parts by weight of a refractory agent, putting into a high-temperature converter, heating to 1100 plus materials and 1300 ℃ for vitrification for 2-3h, preserving heat for 20-40 min, taking out after completion, then crushing the vitrified block objects, and grinding by a ball mill to obtain vitrified powder;
preparing fire-proof temperature control powder: mixing 20-40 parts of porcelainized powder, 10-30 parts of magnesium silicate, 80-120 parts of calcium sulfate dihydrate, 0-20 parts of kaolin and 0-30 parts of calcium silicate or derivatives thereof according to parts by weight to obtain fireproof temperature control powder;
preparation of powder material: mixing 40-80 parts of hydroxide, 40-80 parts of carbonate, 30-90 parts of phosphate, 10-30 parts of argil, 5-15 parts of zinc borate, 5-10 parts of boric acid, 1-5 parts of dispersing aid and 120-160 parts of fireproof temperature control powder according to parts by weight to obtain a powder material;
the powder material is laid in the middle of the silicon rubber fireproof flexible layer with a double-layer structure and then sewn into a blanket, and the fireproof blanket capable of controlling temperature and preventing fire at different temperature areas is obtained.
9. The method for preparing a fire blanket with temperature-controllable fire protection at different temperature ranges according to claim 8, wherein the carbonate comprises at least one of calcium carbonate, magnesium carbonate, sodium carbonate and sodium bicarbonate; the dispersing aid is zinc stearate and/or stearic acid; hydroxides include magnesium hydroxide and aluminum hydroxide; the phosphate comprises at least one of dibasic calcium phosphate dihydrate and dibasic sodium phosphate heptahydrate.
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Citations (5)
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|---|---|---|---|---|
| NL8915005A (en) * | 1988-06-16 | 1990-11-01 | Vickers Shipbuilding & Eng | IMPROVEMENTS IN OR RELATED TO MATERIALS RESISTANT TO HIGH TEMPERATURES. |
| CN105860536A (en) * | 2016-04-13 | 2016-08-17 | 山东兆圭高分子材料科技有限公司 | Flame-retardant and fire-resistant ceramic silicone rubber and preparation method thereof |
| CN109852068A (en) * | 2018-12-24 | 2019-06-07 | 杨萌 | A kind of preparation method of Ceramic silicon rubber |
| CN110028740A (en) * | 2019-06-11 | 2019-07-19 | 广讯检测（广东）有限公司 | A kind of staged flame retardant plastics and preparation method thereof |
| CN110354414A (en) * | 2019-06-24 | 2019-10-22 | 深圳市沃尔核材股份有限公司 | A kind of fire blanket and its production method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8915005A (en) * | 1988-06-16 | 1990-11-01 | Vickers Shipbuilding & Eng | IMPROVEMENTS IN OR RELATED TO MATERIALS RESISTANT TO HIGH TEMPERATURES. |
| CN105860536A (en) * | 2016-04-13 | 2016-08-17 | 山东兆圭高分子材料科技有限公司 | Flame-retardant and fire-resistant ceramic silicone rubber and preparation method thereof |
| CN109852068A (en) * | 2018-12-24 | 2019-06-07 | 杨萌 | A kind of preparation method of Ceramic silicon rubber |
| CN110028740A (en) * | 2019-06-11 | 2019-07-19 | 广讯检测（广东）有限公司 | A kind of staged flame retardant plastics and preparation method thereof |
| CN110354414A (en) * | 2019-06-24 | 2019-10-22 | 深圳市沃尔核材股份有限公司 | A kind of fire blanket and its production method |
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