CN111825935A - Flexible fireproof tube for wires and cables and application thereof - Google Patents
Flexible fireproof tube for wires and cables and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
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- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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Abstract
The invention provides a flexible fireproof tube for wires and cables, which is integrally in a hollow tube shape and comprises a flexible resin outer layer and an expandable graphite inner tube, wherein the flexible resin outer layer is coated on the outer layer of the expandable graphite inner tube, and the expandable graphite inner tube is prepared from raw materials including flexible resin, expandable graphite, white carbon black, a flame retardant and a carbon forming agent. The modified expandable graphite is adopted in the expandable graphite inner tube, so that the expandable graphite inner tube has a certain expansion ratio at low temperature, and can play a role in fire prevention at the initial stage of fire disaster and at low temperature. The fireproof pipe for the electric wires and the cables provided by the invention has good weather resistance, and shows excellent weather resistance in tests of frost cycle resistance, high temperature and high humidity resistance, corrosion resistance, water resistance and oil resistance, so that the fireproof pipe is durable in use.
Description
Technical Field
The invention belongs to the field of fire prevention, and particularly relates to a flexible fire-proof pipe for wires and cables and application thereof.
Background
At present in the building, because the increase of consumer, need set up the hole of a lot of penetrability between the wall, the floor, the wire and cable's of being convenient for passes through. In case of fire, the holes become a safety hazard, and hot gas and salt fog are diffused to other rooms through the holes, and more importantly, the cable channel may form a shaft effect to intensify the fire.
At present, fireproof plugging materials are generally adopted to plug holes, but the existing commercially available stranded materials generally have the defects of insufficient flexibility, inconvenience in disassembly, poor weather resistance, particularly poor water resistance, and limitation on cable protective sleeves. With fire prevention mud, form hard massive thing after the solidification, do not have and stretch and elasticity, unable buffer stress when buildings such as mechanical vibration take place mechanical displacement, can take place to break, kibbling phenomenon still can destroy the cable electric wire when serious, moreover because solidification is very inconvenient when maintenance and change behind the hard piece, often local construction just need change holistic fire-proof material, and is with high costs, the process is loaded down with trivial details. Therefore, the flexible and tough fireproof material is one direction of the current fireproof plugging material.
CN201921208330.4 discloses a polyvinyl chloride insulated flexible cable, which is provided with fire-proof strips between the wire cores, the fire-proof strips are provided with inner cavities, the inner cavities are provided with fire-retardant fillers, and the outer walls of the fire-proof strips are wrapped with glass fiber layers. However, the flexibility of the outer sleeve of the wire cable is not enough, when the cable is used in building construction, particularly subsequent decoration, a pipeline through which the cable passes often involves a plurality of large-angle bends, and the flexibility, the mechanical property and the fireproof flame-retardant property are contradictory and difficult to balance. Moreover, the fire-resistant pipe of the patent melts in the combustion chamber.
CN201910718042.1 discloses a fireproof plugging material for cable ducts, which is composed of two components, wherein the component A is a microcapsule flame-retardant smoke suppressant, and the fireproof capability of the polyurethane fireproof plugging material is improved. However, the mechanical properties and weather resistance of polyurethane fire-retardant materials decrease sharply with increasing temperature. And has poor water resistance and is hydrolyzed by long-term contact with water. In some buildings, such as kitchens, boiler rooms and water boiling rooms, under the high-temperature and high-humidity environment, the fireproof plugging material is not suitable, not only can effective fire prevention be realized after long-term use, but also the poor water resistance of the fireproof plugging material per se forms a serious potential safety hazard.
CN201110394286.2 discloses a fireproof silicone foam material, which is obtained by curing polysiloxane and hydrogen-containing silicone oil serving as main raw materials in the presence of a platinum group catalyst, and has the advantages of good flame retardant property and oxidation and aging resistance. But still does not solve the problem of poor water resistance.
The fireproof plugging material also has the problems that the fireproof material can generate a molten drop phenomenon at high temperature, cannot keep a complete shape and is unfavorable for fireproof and flame-retardant performance. On the other hand, the fire-proof and anti-poison material adopting expandable graphite in the prior art utilizes the expansion of the expandable graphite at high temperature to play the fire-proof role of isolating toxic smoke, hot gas and heat insulation, but the expansion at low temperature in the initial stage of fire is not satisfactory, as is well known, after the fire occurs, the fire-extinguishing and disaster-relieving time of gold is in the early stage of the fire, the environmental temperature is not high at the moment and is far lower than the high temperature of 800 plus 1000 ℃ at which the expandable graphite plays a role, so that the fire-proof material with a certain expansion ratio at low temperature (200 plus 600 ℃) is needed.
Therefore, for the above reasons, the fire-resistant materials for electric wires and cables in the construction field do not have expansibility when a fire occurs, and thus smoke easily spreads, or the fire-resistant materials easily scatter and lose fire resistance as the fire progresses. In addition, there are problems that the weather resistance is not good, and particularly the water resistance is not satisfactory; the fire-proof pipe for the electric wire and the cable has the defects of no expansion at low temperature or low expansion rate, and melting and dripping at high temperature, so that the fire-proof pipe for the electric wire and the cable has good weather resistance, stable performance, capability of expanding at low temperature and excellent fire-proof grade.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a flexible fire protection pipe for electric wires and cables, which is hollow and tubular as a whole, and comprises a flexible resin outer layer and an expandable graphite inner pipe, wherein the flexible resin outer layer is coated on an outer layer of an inner core of the expandable graphite, the outer layer has an anti-aging effect, and the inner pipe can expand in case of fire, and has a fire retardant function and a plugging function. Preferably, the invention further solves the technical problems that the expandable graphite is modified by an organic intercalation agent, the mixed acid comprises benzene trisulfonic acid, the benzene trisulfonic acid and the organic intercalation agent play a synergistic effect, the expandable graphite can expand to a certain degree at a low temperature, and the purpose of delaying the fire can be played at the initial stage of a fire; the expansion ratio can be effectively controlled when the flexible resin jacket is heated, and the expansion ratio can be inhibited at high temperature, so that the flexible resin jacket is not propped open. Meanwhile, the flexible fireproof tube has excellent weather resistance, can keep good toughness and fireproof grade under the conditions of low-temperature circulation, high-temperature high-humidity circulation and simulated aging of ultraviolet irradiation, is durable in use and long in service life, and avoids high cost and fussy work caused by periodic replacement.
The invention solves the technical problems through the following technical scheme:
the invention provides a flexible fireproof tube for wires and cables, which is integrally in a hollow tube shape and comprises a flexible resin outer layer and an expandable graphite inner tube, wherein the flexible resin outer layer is coated on the outer layer of the expandable graphite inner tube, and the expandable graphite inner tube is prepared from raw materials including flexible resin, expandable graphite, white carbon black, a flame retardant and a carbon forming agent.
Preferably, the expandable graphite is modified expandable graphite, and the preparation raw materials comprise crystalline flake graphite, an oxidant and mixed acid, wherein the mixed acid comprises benzene trisulfonic acid.
Preferably, the raw material for preparing the modified expandable graphite also comprises an anionic intercalation agent.
The thickness of the outer layer of the flexible resin is 0.2-0.5mm, the thickness of the expandable graphite inner tube is 2-5mm, and the inner diameter is 5-15 mm. The inner diameter refers to the diameter of the hollow cylinder inside the expandable graphite.
Further preferably, the anionic intercalating agent is an anionic surfactant with long chain alkyl groups, such as sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, sodium diisooctyl succinate sulfonate, sodium lauryl sulfate, sodium fatty alcohol ether sulfate.
Further, the preparation raw materials of the flexible resin outer layer comprise the following raw materials in parts by weight: 2-3 parts of polyvinyl chloride resin, 0.5-1 part of silica filler, 0.5-1 part of glass fiber, 1-2 parts of flame retardant, 0.5-1 part of plasticizer and 1-1.5 parts of chlorinated rubber; the expandable graphite inner tube comprises the following raw materials in parts by weight: 15-30 parts of flexible resin, 25-40 parts of modified expandable graphite, 10-20 parts of silane coupling agent modified white carbon black, 5-10 parts of stearic acid modified mica, 1-3 parts of curing agent, 4-8 parts of intumescent flame retardant, 1-3 parts of smoke suppressor and 2-5 parts of char former.
The flame retardant is selected from at least one of ammonium polyphosphate, triphenyl phosphate, zinc borate, aluminum hydroxide, magnesium hydroxide and antimony trioxide.
The plasticizer is an organosilicon compound containing silicon and nitrogen, and the substance can play a role in plasticization, flame retardance and coupling at the same time, such as amino silicone oil; or the plasticizer is selected from tributyl phosphate, tri (2-ethylhexyl) phosphate, epoxy oleate and chlorinated paraffin which can play a role in plasticization and flame retardance.
Preferably, in the preparation raw material of the expandable graphite inner tube, the modified expandable graphite is prepared by mixing natural crystalline flake graphite with an oxidant, a mixed acid and an anionic organic intercalation agent.
Further, the modified expandable graphite comprises the following raw materials in parts by weight: 10-15 parts of natural crystalline flake graphite, 0.5-0.8 part of oxidant, 20-80 parts of mixed acid and 3-5 parts of anion intercalation agent.
The oxidant is KMnO4，KClO3，K2Cr2O7,(NH)4S2O8And at least one of hydrogen peroxide (40%).
The mixed acid is concentrated sulfuric acid, concentrated nitric acid, oxalic acid and benzene trisulfonic acid according to the mass ratio of 4-6: 2-2.5: 1-2: 2-3.
The amount of the mixed acid is not particularly limited, and the natural crystalline flake graphite can be sufficiently soaked, and is generally more than 30 parts, but the excessive amount of the mixed acid causes waste of raw materials, and is generally controlled below 80 parts.
The inventor unexpectedly finds that when the expandable graphite is prepared, a certain amount of benzene trisulfonic acid is added into mixed acid to be matched with intercalation of an anionic surfactant, and the expansion rate of the prepared modified expandable graphite can reach a satisfactory degree at low temperature. Generally, the swelling rate is considerable at 200 ℃. Meanwhile, a certain amount of oxalic acid is added to serve as an acid source and an organic intercalation agent, and the oxalic acid can be decomposed to generate carbon dioxide when being heated, so that the graphite is further expanded.
Preferably, the modified expandable graphite of the present invention is obtained by a preparation method comprising the following steps: dissolving an oxidant in mixed acid, adding natural crystalline flake graphite into the mixed acid solution, uniformly mixing, filtering, washing with hydrogen peroxide, washing with water to be neutral, and drying to obtain the modified expandable graphite.
The flexible resin is selected from polyvinyl chloride resin and polysiloxane resin.
The carbon forming agent is selected from the compound of polyalcohol and chitosan, and the polyalcohol is selected from at least one of pentaerythritol, dimer of pentaerythritol and trimer of pentaerythritol; preferably, the mass ratio of the polyhydric alcohol to the chitosan is 5-10:1-2, preferably 6-8: 1-1.4.
The inventor finds that a certain amount of chitosan with larger molecular weight is added into the carbon forming agent, the chitosan has a certain amount of hydroxyl and amino, the hydroxyl is condensed with pentaerythritol under the action of phosphate ester at high temperature, the expansion rate of the expanded graphite at high temperature can be inhibited, and the excessive expansion of building holes at high temperature can be prevented; the amino on the chitosan can also participate in the curing reaction, so that the weather resistance and the mechanical strength of the fireproof material are improved.
In the white carbon black modified by the silane coupling agent, the silane coupling agent is selected from at least one of KH-550, KH570, KH551, KH580 and KH-792; the white carbon black is preferably fumed silica with the specific surface area of 150-250m2(ii)/g, preferably 180-2/g。
The white carbon black is used as a filler frequently added into the fireproof material, so that the mechanical property and the ageing resistance of the material can be improved. The inventor finds that the white carbon black modified by the silane coupling agent can further improve the fire-proof grade of the fire-proof material, so that the limit time of combustion is prolonged; but also can increase the weather resistance of the fire-proof strip to a certain extent.
The preparation method of the stearic acid modified mica comprises the following steps: and (2) crushing mica powder into 1-10 mu m, adding the crushed mica powder into a stearate solution, reacting for 4-6h under the condition of heating and stirring, and filtering and drying to obtain the stearic acid modified mica.
The pulverization is not particularly limited, and the mica may be pulverized to a predetermined particle diameter, for example, by jet milling, grinding, ball milling, or the like. The stearate is one or the combination of two of sodium stearate and potassium stearate. The solvent of the stearate solution is at least one of ethanol, acetone, diethyl ether, propanol and butanediol. The concentration of stearate is 0.3-0.5M. The amount of the stearic acid solution used is not particularly limited as long as the mica powder can be sufficiently impregnated, and generally, the amount of the stearic acid solution is 5 to 8 times the amount of the mica used, in terms of weight ratio.
Mica is generally used in the fireproof plugging material because of good insulation, high temperature resistance and heat insulation, and the working time of the electric wire and the cable in a fire disaster can be prolonged. However, mica is easily embrittled at high temperature, which causes cracking, pulverization and other phenomena, and can not ensure the integrity of the fireproof pipe of the electric wire and the cable in fire, thus having adverse effect on fire prevention and serious safety accidents. After the surface of mica is modified by stearic acid, the defect that the composite material is brittle at high temperature can be obviously improved.
The curing agent is silicon triphosphate.
The smoke suppressor is selected from at least one of ferrocene, molybdenum compounds (such as zinc molybdate, calcium molybdate, ammonium molybdate and molybdenum trioxide) and antimony trioxide, and is preferably compounded by the ferrocene, the molybdenum compounds and the antimony trioxide according to the mass ratio of 10-13:8-10: 1-1.5. Antimony trioxide is a flame retardant and a smoke suppressor with excellent performance, but has the defects that black smoke is generated in a combustion chamber, certain potential safety hazards exist, the consumption of antimony trioxide can be greatly reduced according to the compounded smoke suppressor, and the flame retardant, the fireproof and the smoke suppression effects of the material cannot be influenced.
The intumescent flame retardant consists of an acid source, a carbon source and a gas source, wherein the acid source is selected from phosphoric acid and ammonium polyphosphate, and the carbon source is selected from sorbitol, starch and sucrose; the gas source is selected from melamine or a salt thereof; the salt is selected from at least one of melamine borate, melamine pyrophosphate and melamine cyanurate salt. The mass ratio of the acid source to the carbon source to the gas source is 1-2:1-2: 1-2.
The invention also provides a preparation method of the flexible fireproof tube for the electric wire, the preparation method comprises the following steps:
respectively putting the raw materials of the expandable graphite inner tube and the flexible resin outer layer into corresponding parts of an extruder, controlling the thickness of the flexible resin outer layer to be 0.2-0.5mm, the thickness of the expandable graphite inner tube to be 2-5mm, the inner diameter to be 5-15mm, controlling the extrusion temperature to be 140-.
The invention also provides the application of the flexible fireproof tube for the electric wires and cables, in particular to a protective tube for the electric wires and cables in buildings. When a fire disaster occurs, the fire-proof and flame-retardant sealing material not only has a fire-proof and flame-retardant effect, but also can expand to play a role in sealing hot air and toxic smoke. Preferably, considerable expansion occurs at low temperatures, and serves to prevent the spread of fire to some extent in the early stages of a fire. Under high temperature, the expansion rate is fast, the expansion rate is moderate, the plugging effect on hot gas and toxic smoke can be well realized, and the safety of residents is guaranteed.
The beneficial effects obtained by the invention are as follows:
the expandable graphite inner tube has the advantages of good flexibility, excellent expansion performance, good shape retention after combustion and environmental protection, and has good fluidity in the extrusion or injection molding process, stable size after cooling, and can effectively prevent fire or poisoning phenomena caused by toxic smoke or flame passing through the gaps of holes in buildings when fire occurs.
Second, the expandable graphite modified according to the present invention preferably has a certain expansion ratio at low temperature, and exhibits a fire-proof effect at the initial stage of a fire when the temperature is not high.
And thirdly, preferably, the fireproof pipe for the electric wire and the cable provided by the invention has good weather resistance, and shows excellent weather resistance in tests of frost cycle resistance, high temperature and high humidity resistance, corrosion resistance, water resistance and oil resistance, so that the fireproof pipe is durable in use and can be used for a long time without performance reduction, the replacement energy and material resources are avoided, and the cost can be reduced.
Fourthly, by specially compounding the components of the smoke suppressant, the smoke density of the smoke suppressant can be further obviously reduced in a high-temperature ignition state.
Drawings
Fig. 1 is a schematic view of a flame retardant tube, as described herein.
Detailed Description
In the examples of the present invention, "part" means part by weight unless otherwise specified, and "%" means% by weight unless otherwise specified.
The concentration of the concentrated nitric acid used in the embodiment of the invention is 98 wt%, the concentration of the concentrated nitric acid is 66 wt%, the natural crystalline flake graphite is purchased from Qingdao Tianyuan Daigao graphite Co Ltd, the granularity is 0.5mm-1 μm, and the carbon content is more than 98%. The fumed silica is purchased from Wacker, brand N20, BET180-200m2(ii) in terms of/g. The glass fiber is purchased from the fiber industry, the monofilament diameter is about 8 mu m, and the ignition loss is below 0.3 percent. The mica is purchased from a Hebei Xingyuan mineral powder processing factory, has the specification of 50 meshes and is white in color.
Preparation examplePreparation of modified expandable graphite
Preparation example 1
Dissolving 0.5 part of potassium permanganate and 3 parts of sodium dodecyl benzene sulfonate in 40 parts of mixed acid, wherein the mixed acid is concentrated sulfuric acid, concentrated nitric acid, oxalic acid and benzene trisulfonic acid according to a mass ratio of 5:2: 1: 3, stirring and mixing uniformly to obtain a mixed acid solution, adding 12 parts of natural crystalline flake graphite into the mixed acid solution, stirring and mixing uniformly, filtering after 6 hours, filtering the filtrate with 20% hydrogen peroxide, washing with pure water to be neutral, and drying in an oven at 50 ℃ overnight to obtain the modified expandable graphite, which is hereinafter referred to as expandable graphite 1.
Preparation example 2
Dissolving 0.5 part of potassium permanganate and 3 parts of sodium dodecyl sulfate in 40 parts of mixed acid, wherein the mixed acid is concentrated sulfuric acid, concentrated nitric acid, oxalic acid and benzene trisulfonic acid according to a mass ratio of 5:2: 1: 2, stirring and mixing uniformly to obtain a mixed acid solution, adding 12 parts of natural crystalline flake graphite into the mixed acid solution, stirring and mixing uniformly, filtering after 6 hours, filtering a filter substance by using 20% hydrogen peroxide, washing the filter substance to be neutral by using pure water, and drying the filter substance overnight in a 50 ℃ oven to obtain the modified expandable graphite, which is hereinafter referred to as expandable graphite 2.
Preparation example 3
Dissolving 0.5 part of potassium permanganate in 40 parts of mixed acid, wherein the mixed acid is concentrated sulfuric acid, concentrated nitric acid, oxalic acid and benzene trisulfonic acid according to a mass ratio of 5:2: 1: 3, stirring and mixing uniformly to obtain a mixed acid solution, adding 12 parts of natural crystalline flake graphite into the mixed acid solution, stirring and mixing uniformly, filtering after 6 hours, filtering a filtrate with 20% hydrogen peroxide, washing with pure water to be neutral, and drying in an oven at 50 ℃ overnight to obtain the modified expandable graphite, which is hereinafter referred to as expandable graphite 3.
Preparation example 4
Dissolving 0.5 part of potassium permanganate and 3 parts of sodium dodecyl benzene sulfonate in 40 parts of mixed acid, wherein the mixed acid is prepared by compounding concentrated sulfuric acid, concentrated nitric acid and oxalic acid according to the mass ratio of 5:2:1, stirring and mixing uniformly to obtain a mixed acid solution, adding 12 parts of natural crystalline flake graphite into the mixed acid solution, stirring and mixing uniformly, filtering after 6 hours, filtering a filter substance by using 20% hydrogen peroxide, washing the filter substance to be neutral by using pure water, and drying the filter substance in an oven at 50 ℃ overnight to obtain modified expandable graphite, which is hereinafter referred to as expandable graphite 4.
The expandable graphite obtained in the above preparation example was subjected to an expansion test, and the results are shown in table 1 below:
TABLE 1
Preparation example 5
10 parts of superfine mica powder which is subjected to airflow crushing and has the particle size of about 5 mu M are put into 60 parts of 0.4M sodium stearate solution (the solvent is a mixed solvent of ethanol and acetone according to the volume ratio of 1: 1), stirred and reacted for 6 hours at the temperature of 50 ℃, cooled, filtered, washed and dried to obtain the stearic acid modified mica.
Example 1
1-1 raw material composition of flexible resin outer layer
3 parts of polyvinyl chloride resin, 1 part of silica filler, 1 part of glass fiber, 1 part of ammonium polyphosphate flame retardant, 0.7 part of tris (2-ethylhexyl) phosphate plasticizer and 1.5 parts of chlorinated rubber. The raw materials are uniformly mixed to be used as the raw material of the flexible resin outer layer.
1-2 raw material composition of expandable graphite inner tube
25 parts of polyvinyl chloride resin, 35 parts of expandable graphite 1 prepared in preparation example 1, 15 parts of KH550 modified fumed silica, 10 parts of stearic acid modified mica prepared in preparation example 5, 3 parts of silicon triphosphate, 6 parts of intumescent flame retardant (a compound of 2 parts of ammonium polyphosphate, 2 parts of sorbitol and 2 parts of melamine borate), 2 parts of smoke suppressor (a compound of ferrocene, zinc molybdate and antimony trioxide in a mass ratio of 10:8: 1), and 4 parts of char former (a compound of pentaerythritol and chitosan in a mass ratio of 6: 1).
1-3
Respectively putting raw materials of the expandable graphite inner tube and the flexible resin outer layer into corresponding parts of an extruder, wherein the thickness of the flexible resin outer layer is 0.2mm, the thickness of the expandable graphite inner tube is 3mm, the inner diameter of the expandable graphite inner tube is 10mm, the extrusion temperature is controlled to be about 160 ℃, extruding, embossing and cooling are carried out, and the fireproof tube for the electric wire and the cable is obtained.
Example 2
The other conditions were the same as in example 1 except that 1-2 expandable graphite inner tube was made of a raw material composition in which expandable graphite 1 was replaced with expandable graphite 2 of equal mass.
Example 3
The other conditions were the same as in example 1 except that the expandable graphite 1 was replaced with the expandable graphite 3 of the same mass in the raw material composition of the expandable graphite inner tube.
Example 4
The other conditions were the same as in example 1 except that the char-forming agent was 4 parts of pentaerythritol in the raw material composition of the expandable graphite inner tube 1-2.
Example 5
The other conditions are the same as the example 1, and the difference is that in the raw material composition of the expandable graphite inner tube 1-2, 2 parts of smoke suppressor is the combination of ferrocene and antimony trioxide according to the ratio of 10: 1.
Example 6
The other conditions are the same as example 1, except that in the raw material composition of the 1-2 expandable graphite inner tube, the fumed silica is not modified by the silane coupling agent.
Example 7
The other conditions are the same as example 1, except that mica is used directly after being ultrafine-ground in the raw material composition of the 1-2 expandable graphite inner tube, without being modified by stearic acid.
Example 8
The other conditions were the same as in example 1 except that the expandable graphite 1 was replaced with the expandable graphite 4 of equal mass in the raw material composition of the expandable graphite inner tube.
Comparative example 1
The other conditions were the same as in example 1 except that in the raw material composition of the expandable graphite inner tube, the expandable graphite 1 was replaced with an equal mass of ordinary commercial expandable graphite (purchased from Qingdao Tianyuan graphite Co., Ltd., sulfur content of about 1.5%, carbon content of 97%).
Application example
The flexible fireproof strips obtained in the above examples and comparative examples are tested according to GB23864-2009, smoke density is tested according to GB/T8627-2007 standard for Smoke Density (SDR), and insulation is qualified by breakdown voltage of more than 25 kV/mm. The results are shown in table 2 below. The shape retention property after burning was a property of burning at 900 ℃ for 60 minutes.
TABLE 2
As can be seen from the data in Table 2, the fireproof tube for the electric wires and cables, which is prepared by the preparation method disclosed by the invention, has excellent comprehensive performance, obviously improved weather resistance and fire resistance, particularly excellent water resistance and high-temperature and high-humidity resistance, ensures the safe use of electric equipment in a high-temperature and high-humidity environment, and effectively eliminates potential safety hazards.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The flexible fireproof tube for the wires and the cables is integrally in a hollow tube shape and comprises a flexible resin outer layer and an expandable graphite inner tube, wherein the flexible resin outer layer is coated on the outer layer of the expandable graphite inner tube, and preparation raw materials of the expandable graphite inner tube comprise flexible resin, expandable graphite, white carbon black, a flame retardant and a carbon forming agent.
2. The fire resistant pipe according to claim 1, wherein the expandable graphite is a modified expandable graphite prepared from a material comprising flake graphite, an oxidizing agent, and a mixed acid comprising trimellitic acid.
3. The flame retardant tube of claim 2, wherein the modified expandable graphite comprises the following raw materials, by weight: 10-15 parts of natural crystalline flake graphite, 0.5-0.8 part of oxidant, 20-80 parts of mixed acid and 3-5 parts of anion intercalation agent.
4. The fire protection pipe according to claim 2, wherein the mixed acid is concentrated sulfuric acid, concentrated nitric acid, oxalic acid and trimellitic acid in a mass ratio of 4-6: 2-2.5: 1-2: 2-3.
5. The fire protection tube according to claim 1, wherein the modified expandable graphite is prepared from raw materials further comprising an anionic intercalation agent, preferably the anionic intercalation agent is an anionic surfactant having a long chain alkyl group; more preferably at least one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, sodium diisooctyl succinate sulfonate, sodium lauryl sulfate and sodium fatty alcohol ether sulfate.
6. The flame retardant tube of claim 1, wherein, the flexible resin outer layer has a thickness of 0.2-0.5mm, the expandable graphite inner tube has a thickness of 2-5mm, and an inner diameter of 5-15 mm.
7. The flame retardant tube of any one of claims 1-6, wherein the flexible resin outer layer is prepared from raw materials comprising, by weight: 2-3 parts of polyvinyl chloride resin, 0.5-1 part of silica filler, 0.5-1 part of glass fiber, 1-2 parts of flame retardant, 0.5-1 part of plasticizer and 1-1.5 parts of chlorinated rubber; the expandable graphite inner tube comprises the following raw materials in parts by weight: 15-30 parts of flexible resin, 25-40 parts of modified expandable graphite, 10-20 parts of silane coupling agent modified white carbon black, 5-10 parts of stearic acid modified mica, 1-3 parts of curing agent, 4-8 parts of intumescent flame retardant, 1-3 parts of smoke suppressor and 2-5 parts of char former.
8. The flame retardant tube of claim 7, wherein, the flexible resin is selected from the group consisting of polyvinyl chloride resin, silicone resin;
in the white carbon black modified by the silane coupling agent, the silane coupling agent is selected from at least one of KH-550, KH570, KH551, KH580 and KH-792; the specific surface area of the white carbon black which is preferably fumed silica is 150-250m2(ii)/g, preferably 180-2/g；
The curing agent is silicon triphosphate;
the smoke suppressor is selected from at least one of ferrocene, molybdenum compounds (such as zinc molybdate, calcium molybdate, ammonium molybdate and molybdenum trioxide) and antimony trioxide, and is preferably compounded by the ferrocene, the molybdenum compounds and the antimony trioxide according to the mass ratio of 10-13:8-10: 1-1.5;
the intumescent flame retardant consists of an acid source, a carbon source and a gas source, wherein the acid source is selected from phosphoric acid and ammonium polyphosphate, the carbon source is selected from sorbitol, starch and cane sugar, the gas source is selected from melamine or melamine salt, the salt is selected from at least one of melamine borate, melamine pyrophosphate and melamine cyanurate, and the mass ratio of the acid source to the carbon source to the gas source is 1-2:1-2: 1-2.
9. The fire resistant tubing of claim 7 wherein the char-forming agent is selected from the group consisting of a combination of a polyol selected from at least one of pentaerythritol, a dimer of pentaerythritol, and a trimer of pentaerythritol; the mass ratio of the polyalcohol to the chitosan is 5-10:1-2, preferably 6-8: 1-1.4.
10. Use of a fire protection tube according to any one of claims 1 to 9, for the protection of electrical wires, cables in construction.
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| CN202010799297.8A CN111825935A (en) | 2020-08-11 | 2020-08-11 | Flexible fireproof tube for wires and cables and application thereof |
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| CN202010799297.8A CN111825935A (en) | 2020-08-11 | 2020-08-11 | Flexible fireproof tube for wires and cables and application thereof |
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