Penetration sealing method for light-weight and high-fire-resistance-grade filling material type cable

Abstract

The invention belongs to the technical field of cable sealing and penetrating, and particularly provides a light filler type cable penetrating and sealing method with a high fire resistance rating, which comprises the following steps: S1, cleaning the periphery of a through hole, naturally drying, penetrating a cable along the through hole, and then fixing a clamping piece and a support frame on a cabin wall; s2, filling a gap between the cables with a filling material, then filling an area between the cables and the clamping piece with the filling material, then sealing the clamping piece, the filling material and the cables with a sealant, and flattening the surface of the sealant with a tool to complete sealing; wherein the filling material is prepared from refractory fiber felt, hydrophobic liquid and flame-retardant liquid. The filler type cable penetration sealing method provided by the invention is relatively simple and convenient, ensures the sealing firmness between the sealant and the support frame, and improves the sealing effect and efficiency; meanwhile, the filler has the characteristics of light weight and high fire resistance, can effectively insulate heat, does not contain asbestos, and is non-toxic and halogen-free.

Description

Technical Field

[0001] The present invention belongs to the technical field of cable sealing penetration, and specifically provides a filler-type cable penetration sealing method with light weight and high fire resistance rating. Background Art

[0002] With the increasing requirements of the international maritime industry for energy conservation and environmental protection performance, it has become a consensus to reduce the weight of the ship itself and achieve ship lightweighting. In ship design, cable penetration sealing is a key safety issue that needs to meet strict fire prevention, waterproofing, and airtightness requirements. With the increase in ship tonnage, requirements for the lightweighting of cable sealing have also been put forward.

[0003] Lightweighting can not only improve the cargo capacity of the ship, but also reduce energy consumption and emissions, meeting the increasingly strict environmental protection standards. Lightweight fillers play an important role in shipbuilding. Common fillers are based on refractory fiber felts. Due to their light weight, good strength, high temperature resistance and other characteristics, refractory fiber felts have been widely used in shipbuilding, especially in key parts such as cable penetration sealing. At present, effectively improving the fire resistance, heat insulation and waterproof properties of refractory fiber felts helps to improve the fire safety of ships and protect ships from threats.

[0004] Chinese Patent CN 115700234 B discloses a fiber-reinforced low-density porous thermal insulation material. The fiber-reinforced low-density thermal insulation material is prepared by a dry pressing method, and its preparation raw materials are composed of the following raw materials in weight percentage: compressible powder 50-99%, ceramic fiber 1-50%; the ceramic fiber is composed of refractory fiber and infrared light-shielding fiber. In the material of this invention, powdery infrared light-shielding agent is not added, but infrared light-shielding fiber is used to reduce the thermal conductivity of the thermal insulation material in the high-temperature section, which can effectively improve the anti-bending strength, maximum service temperature of the material and reduce the thermal conductivity. However, the bulk density of this material is 200-450 kg / m 3 , although it has certain lightweight characteristics, its bulk density still needs to be improved.

[0005] Therefore, there is an urgent need for a lightweight filler with a high fire resistance rating, and the sealing device obtained by the cable penetration sealing method using this filler has good airtightness and watertightness. Summary of the Invention

[0006] Aiming at the existing technical problems, the purpose of the present invention is to provide a preparation method of a filler-type cable penetration sealing method with light weight and high fire resistance rating. The filler-type cable penetration sealing method provided by the present invention is relatively simple and convenient, ensuring the sealing firmness between the sealant and the support frame, improving the sealing effect and efficiency; at the same time, the filler of the present invention has the characteristics of light weight and strong fire resistance, can effectively insulate heat, and does not contain asbestos, is non-toxic and halogen-free.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The present invention provides a lightweight and high fire-resistant grade filler type cable penetration sealing method, comprising the following steps:

[0009] S1. Clean the periphery of the through-hole and dry it naturally. Pass the cable through the through-hole, and then fix the clamping member and the support frame on the bulkhead;

[0010] S2. First, stuff the filler between the cables, then fill the area between the cable and the clamping member with the filler, then seal the clamping member, the filler and the cable with sealant, and finally level the surface of the sealant with a tool to complete the sealing; wherein,

[0011] The filler is prepared from refractory fiber felt, hydrophobic liquid and flame retardant liquid.

[0012] The reaction mechanism and function of the present invention are as follows:

[0013] 1. The present invention relates to a refractory fiber mainly composed of alumina fiber, which has low cost and excellent heat resistance. The refractory fiber felt made of this refractory fiber is not only light and heat-insulating, but also due to the excellent chemical corrosion resistance of alumina, the environmental protection and recyclability of the refractory fiber felt are enhanced. The addition of magnesium oxide further improves the fire resistance of the fiber felt. Because zirconia has high temperature resistance, oxidation resistance, acid and alkali corrosion resistance, chemical stability and excellent heat insulation performance, the strength of the fiber felt is significantly increased. The addition of titanium dioxide not only assists in strengthening the structure of the fiber felt, but also has a synergistic effect with alumina, enhancing the toughness and fire resistance of the fiber felt. In addition, zirconia and titanium dioxide also have good ultraviolet shielding functions and can be used as antioxidants in the fiber felt to play a role in prolonging the service life of the fiber felt. More importantly, the applicant controls the mass fraction and the crushed particle size between the main materials, which can not only make the prepared refractory fiber felt have relatively stable properties, but also improve the melting rate and enhance the production efficiency of the whole process.

[0014] 2. The present invention adds a polymer additive when preparing the base material refractory fiber felt of the filler, and prepares the polymer additive with boron phenolic resin and phenylacetyl glutamine. On the one hand, compared with traditional phenolic resin, boron phenolic resin has excellent heat resistance, instantaneous high temperature resistance, ablation resistance and oxidation resistance. At the same time, the hydrogen atom in the phenolic hydroxyl group of phenolic resin is replaced by boron, the polarity decreases, and the compatibility with water, a polar molecule, becomes poor, so its water resistance is also improved. On the other hand, by controlling the mass ratio of boron phenolic resin and phenylacetyl glutamine, the applicant toughens and modifies the phenolic resin, which is beneficial to the formation of a network structure, thereby improving the heat insulation performance of the fiber felt.

[0015] 3. After the refractory fiber felt of the present invention is made, it is impregnated with a water-repellent liquid, making the refractory fiber felt waterproof, which is beneficial for its use in ships and ocean engineering. Then, the applicant impregnates it in a flame-retardant liquid to further enhance the flame retardancy of the refractory fiber felt. The flame retardant in the flame-retardant liquid contains epoxy groups, which may react with the silanol groups in the water-repellent liquid under heating conditions to form a stable Si-O-C crosslinked network, thereby improving the mechanical strength and thermal stability of the material.

[0016] In some embodiments, the specific steps of fixing the clamping member and the support frame on the bulkhead are as follows: a plurality of clamping members are distributed along the inner side wall of the through hole, and the opening of the clamping member clamps the bulkhead where the through hole is located, and the support frame is located between the clamping member and the bulkhead.

[0017] In some embodiments, the raw materials for preparing the refractory fiber felt include the following components by weight: 70-90 parts of alumina, 20-30 parts of magnesia, 10-20 parts of zirconia, 10-15 parts of titanium dioxide, and 12-16 parts of polymer additive.

[0018] In some embodiments, the preparation method of the polymer additive comprises the following steps:

[0019] Mix boron phenolic resin, phenylacetyl glutamine, and dimethyl sulfoxide, add methyl sulfonic acid, heat to 50-65 °C, and react for 3-4 h to obtain the polymer additive.

[0020] In some embodiments, the mass ratio of the boron phenolic resin to the phenylacetyl glutamine is 1:(0.1-0.3).

[0021] In some embodiments, the preparation method of the filler comprises the following steps:

[0022] T1. Blend alumina, magnesia, zirconia, and titanium dioxide after holding at 200-400 °C for 1-2 h, and crush to a particle size of 200-350 mesh to obtain the main material;

[0023] T2. Add the polymer additive and the main material obtained in step T1 to a reaction kettle, and heat to 1800-2200 °C to obtain a molten liquid;

[0024] T3. Filter the impurities in the molten liquid obtained in step T2, and the filtrate flows into a reactor at 2200-2400 °C, and continuously stir to obtain a spinning solution;

[0025] T4. Let the spinning solution obtained in step T3 flow out from the discharge port, enter the centrifugal head, and spray out through the fine holes of the centrifugal head. The spinning solution is quickly cooled to obtain solid fibers, which are collected by a cotton collector to obtain refractory fibers;

[0026] T5. Feed the refractory fiber obtained in step T4 into an opening and cleaning cotton device for loosening and carding to obtain a fiber web. Use a needling machine to needle the fiber web to obtain a green refractory fiber felt. Subject the green refractory fiber felt to pressure heat setting, cutting, and collection to obtain a refractory fiber felt;

[0027] T6. Immerse the refractory fiber felt obtained in step T5 in a water-repellent liquid. Take it out and air-dry it until no more dripping occurs, then immerse it in a flame retardant liquid, heat it to 70 - 80 °C, keep it warm for 1 - 2 h, and dry it to obtain a filler.

[0028] In some embodiments, the centrifugal speed of the centrifugal head in step T4 is 20000 - 30000 r / min, and the aperture of the fine holes of the centrifugal head is 0.1 - 0.4 mm.

[0029] In some embodiments, the specific operating parameters of the pressure heat setting in step T5 are as follows: treat at a temperature of 500 - 800 °C and a pressure of 5 - 8 Kg / cm 2 for 30 - 60 min, then raise the temperature to 1200 - 1600 °C at a rate of 10 - 30 °C / min, and treat at a pressure of 3 - 5 Kg / cm 2 for 1 - 3 min.

[0030] In some embodiments, the needling parameters in step T5 are as follows: the needling density is 250 - 500 needles / cm 2 , and the needling depth is 9 - 13 mm.

[0031] In some embodiments, the water-repellent liquid in step T6 comprises the following raw materials by weight: 20 - 30 parts of dimethyl silicone oil, 3 - 5 parts of emulsifier, 1 - 3 parts of cetyltriethoxysilane, and 20 - 50 parts of deionized water.

[0032] In some embodiments, the emulsifier is a combination of fatty alcohol polyoxyethylene ether and polyvinyl acetate.

[0033] In some embodiments, the preparation method of the flame retardant liquid in step T6 comprises the following steps:

[0034] Mix diphenyl phosphoric acid and epichlorohydrin, heat to 120 - 140 °C, stir and react for 20 - 30 h, cool, purify to obtain a flame retardant, and add toluene for mixing to obtain a flame retardant liquid.

[0035] In some embodiments, the bulk density of the filler is 85 - 200 kg / m 3 .

[0036] In some embodiments, the sealant comprises the following raw materials by weight: 80-100 parts of α,ω-dihydroxypolydimethylsiloxane, 25-35 parts of dimethyl silicone oil, 25-40 parts of composite flame retardant, 10-20 parts of modified calcium carbonate, 15-30 parts of crosslinking agent, 2-6 parts of coupling agent, and 0.1-0.5 part of catalyst.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. The filler-type cable penetration sealing method provided by the present invention is relatively simple and convenient, ensuring the sealing firmness between the sealant and the support frame, and improving the sealing effect and efficiency; meanwhile, the filler of the present invention has the characteristics of light weight and strong fire resistance, can effectively insulate heat, does not contain asbestos, and is non-toxic and halogen-free.

[0039] 2. The sealant of the present invention has excellent flame retardancy and high adhesiveness, can resist fire, aging, light, and corrosion, does not contain asbestos, and has the characteristics of being non-toxic, halogen-free, and low-smoke.

[0040] 3. By controlling the mass fraction and the crushed particle size among alumina, magnesia, zirconia, and titanium dioxide, the present invention can not only make the prepared refractory fiber felt have relatively stable properties, but also improve the melting rate and enhance the production efficiency of the whole process.

[0041] 4. When preparing the base refractory fiber felt of the filler, the present invention adds a polymer auxiliary agent, which improves the heat resistance, instantaneous high-temperature resistance, ablation resistance, antioxidant property, and water resistance, and is also beneficial to the formation of a network structure, thereby improving the heat insulation performance of the fiber felt.

[0042] 5. After the refractory fiber felt is made, the present invention impregnates it with a water-repellent liquid and a flame-retardant liquid, which is beneficial to improving the water resistance and flame retardancy of the refractory fiber felt, and enhancing its mechanical strength and thermal stability. Specific Embodiments

[0043] The following will describe the present invention in combination with specific implementation examples. It should be noted that the following examples are examples of the present invention, only for explaining the present invention, rather than limiting the present invention. Without departing from the gist or scope of the present invention, other combinations and various improvements within the inventive concept can be made.

[0044] According to the raw material ratios and production methods specified in the following examples and comparative examples, each filler is produced.

[0045] For the convenience of those skilled in the art to implement the present invention, the manufacturers of some raw materials in the examples and comparative examples are described as follows:

[0046] Polyvinyl acetate: purchased from Jiangsu Runfeng Synthetic Technology Co., Ltd.;

[0047] Fatty alcohol polyoxyethylene ether AEO-9: Purchased from Shanghai Dikaiemu Industry Co., Ltd.;

[0048] Boron phenolic resin: Purchased from Jining Fangyu Chemical Co., Ltd., model TY03;

[0049] α,ω-Dihydroxypolydimethylsiloxane: Purchased from Hubei Chengfeng Chemical Co., Ltd., viscosity at 25 °C is 50000 cps;

[0050] Dimethyl silicone oil: Purchased from Jinan Guigang Chemical Co., Ltd., viscosity at 25 °C is 500 cps;

[0051] Alkylphenol polyoxyethylene ether TX-10: Purchased from Shandong Jinli Chemical Co., Ltd.;

[0052] Nano calcium carbonate: 80 nm;

[0053] For other raw materials without special instructions, they can all be purchased from the market.

[0054] Preparation Example 1

[0055] Preparation method of intumescent flame retardant, comprising the following steps:

[0056] Mix 35 g of phytic acid, 10 g of N-formamidopiperidine and 8 g of 2,3-dihydroxypropyl calcium phosphate and add them to a reaction kettle, add 3.18 g of alkylphenol polyoxyethylene ether TX-10, heat to 75 °C, disperse at high speed at 8000 r / min for 45 min, dry at 85 °C for 24 h, and pulverize to obtain the intumescent flame retardant.

[0057] Preparation Example 2

[0058] Preparation method of modified calcium carbonate, comprising the following steps:

[0059] H1. Mix 200 g of nano calcium carbonate and 1200 mL of absolute ethanol, ultrasonically disperse for 40 min, add 10 g of sodium myristate, heat to 70 °C and react for 60 min, cool to room temperature, wash with absolute ethanol 3 times, and dry at 85 °C for 6 h to obtain the product;

[0060] H2. Mix 150 g of the product obtained in step H1 and 1150 mL of absolute ethanol, ultrasonically disperse for 45 min to obtain a dispersion;

[0061] H3. Add the dispersion obtained in step H2 to a reaction kettle, heat to 75 °C, add 8.25 g of cocoamidopropyl trimethyl ammonium chloride and 4.5 g of ultraviolet absorber UV-1164, carry out mechanical stirring for 80 min, cool to room temperature, and dry at 85 °C to constant weight to obtain the modified calcium carbonate.

[0062] Preparation Example 3

[0063] A method for preparing a sealant, comprising the following steps:

[0064] Q1. Add α,ω-dihydroxypolydimethylsiloxane, dimethyl silicone oil, and a composite flame retardant into a reaction kettle for mixing, then add modified calcium carbonate and stir for 60 min, followed by vacuum degassing for 25 min at a vacuum degree of -0.09 MPa to obtain a base material;

[0065] Q2. Mix vinyl tributanone oxime silane and γ-aminopropyltrimethoxysilane, then add them to the base material obtained in step Q1 for mixing, stir for 30 min, and then add dibutyltin dilaurate and stir for 60 min to obtain a sealant;

[0066] Among them, by weight, the sealant comprises the following raw materials: 90 parts of α,ω-dihydroxypolydimethylsiloxane, 30 parts of dimethyl silicone oil, 32.5 parts of a composite flame retardant, 15 parts of modified calcium carbonate, 22.5 parts of vinyl tributanone oxime silane, 4 parts of γ-aminopropyltrimethoxysilane, and 0.3 part of dibutyltin dilaurate; the composite flame retardant is an SFR-100 type flame retardant and an intumescent flame retardant, and the mass ratio of the two is 1:1; the modified calcium carbonate is prepared from Preparation Example 1; the intumescent flame retardant is prepared from Preparation Example 2.

[0067] Preparation Example 4

[0068] A method for preparing a water-repellent liquid, comprising the following steps:

[0069] Mix 2.5 kg of dimethyl silicone oil and 0.2 kg of cetyltriethoxysilane, stir for 1 h, add 0.2 kg of fatty alcohol polyoxyethylene ether AEO-9 and 0.2 kg of polyvinyl acetate, perform high-speed shearing, and then add 3.5 kg of water to obtain a water-repellent liquid.

[0070] Preparation Example 5

[0071] A method for preparing a flame retardant liquid, comprising the following steps:

[0072] Mix 5 mmol of diphenylphosphoric acid and 20 mL of epichlorohydrin, heat to 130 °C, stir and react at 500 / min for 24 h, cool to room temperature, perform vacuum distillation, and separate by column chromatography to obtain a flame retardant, then add 6000 mL of toluene for mixing to obtain a flame retardant liquid.

[0073] Preparation Example 6

[0074] A method for preparing a polymer assistant A, comprising the following steps:

[0075] Mix 1000 g of boron phenolic resin, 200 g of phenylacetyl glutamine, and 6000 mL of dimethyl sulfoxide, add 60 g of methanesulfonic acid, heat to 60 °C, and react for 3.5 h to obtain polymer auxiliary A.

[0076] Preparation Example 7

[0077] The preparation method of polymer auxiliary B is the same as that of Preparation Example 6, except that the addition amount of phenylacetyl glutamine is 80 g.

[0078] Preparation Example 8

[0079] The preparation method of filler A comprises the following steps:

[0080] T1. Blend 800 g of alumina, 250 g of magnesia, 150 g of zirconia, and 125 g of titanium dioxide at 300 °C for 1.5 h, then pulverize to a particle size of 250 mesh to obtain the main material;

[0081] T2. Add 140 g of polymer auxiliary A and the main material obtained in step T1 to a melting furnace, heat to 2000 °C to obtain a molten liquid;

[0082] T3. Filter the impurities in the molten liquid obtained in step T2, and let the filtrate flow into a reactor at 2300 °C, and continuously stir to obtain a spinning solution;

[0083] T4. Let the spinning solution obtained in step T3 flow out from the discharge port, enter the centrifugal head, and spray out through the fine holes of the centrifugal head. The spinning solution is quickly cooled to obtain solid fibers, which are collected by a cotton collecting device to obtain refractory fibers; wherein, the centrifugal speed is 25000 r / min, and the aperture of the fine holes of the centrifugal head is 0.2 mm;

[0084] T5. Put the refractory fibers obtained in step T4 into an opening and cleaning cotton device for opening, carding, and obtaining a uniformly distributed fiber web. Use a needle punching machine to needle the fiber web to obtain a refractory fiber felt blank, and the needle punching density is 350 needles / cm 2 , the needle punching depth is 11 mm, and the refractory fiber felt blank is subjected to pressure heat setting, cutting, and collection to obtain a refractory fiber felt; wherein, the specific operating parameters of the pressure heat setting: process at a temperature of 650 °C and a pressure of 6 Kg / cm 2 for 45 min, then heat up to 1400 °C at a rate of 20 °C / min and process at a pressure of 4 Kg / cm 2 for 2 min;

[0085] T6. Immerse the refractory fiber felt obtained in step T5 in a water-repellent liquid, take it out and air-dry it until it no longer drips, then immerse it in a flame-retardant liquid, heat to 75 °C, keep it warm for 1.5 h, and dry it at 85 °C to constant weight to obtain filler A.

[0086] Preparation Example 9

[0087] Method for preparing filler B, comprising the following steps:

[0088] T1. Mix 700 g of alumina, 200 g of magnesia, 100 g of zirconia and 100 g of titanium dioxide, keep them at 200 °C for 2 h, then blend and crush to a particle size of 350 mesh to obtain the main material;

[0089] T2. Add 120 g of polymer additive A and the main material obtained in step T1 into a melting furnace, heat to 1800 °C to obtain a molten liquid;

[0090] T3. Filter the impurities in the molten liquid obtained in step T2, let the filtrate flow into a reactor at 2200 °C, and continuously stir to obtain a spinning solution;

[0091] T4. Let the spinning solution obtained in step T3 flow out from the discharge port, enter a centrifugal head, and spray out through the fine holes of the centrifugal head. The spinning solution is rapidly cooled to obtain solid fibers, which are collected by a cotton collector to obtain refractory fibers; wherein, the centrifugal speed is 20000 r / min, and the aperture of the fine holes of the centrifugal head is 0.1 mm;

[0092] T5. Put the refractory fibers obtained in step T4 into an opening and cleaning cotton device for opening, carding to obtain a uniformly distributed fiber web, and use a needling machine to needle the fiber web to obtain a refractory fiber felt blank. The needling density is 250 needles / cm 2 , the needling depth is 9 mm, subject the refractory fiber felt blank to pressure heat setting, cutting and collection to obtain a refractory fiber felt; wherein, the specific operation parameters of the pressure heat setting: treat at a temperature of 500 °C and a pressure of 5 Kg / cm 2 for 60 min, then raise the temperature to 1200 °C at a rate of 10 °C / min, and treat at a pressure of 3 Kg / cm 2 for 3 min;

[0093] T6. Immerse the refractory fiber felt obtained in step T5 in a water-repellent liquid, take it out and air-dry until no more dripping, then immerse it in a flame-retardant liquid, heat to 80 °C, keep warm for 1 h, and dry at 85 °C to constant weight to obtain filler B.

[0094] Preparation Example 10

[0095] Method for preparing filler C, comprising the following steps:

[0096] T1. Mix 900 g of alumina, 300 g of magnesia, 200 g of zirconia and 150 g of titanium dioxide, keep them at 400 °C for 1 h, then blend and crush to a particle size of 200 mesh to obtain the main material;

[0097] T2. Add 160 g of polymer additive A and the main material obtained in step T1 into a melting furnace, and heat to 2200 °C to obtain a molten liquid;

[0098] T3. Filter the impurities in the molten liquid obtained in step T2, and the filtrate flows into a reactor at 2400 °C, and continuously stir to obtain a spinning solution;

[0099] T4. Let the spinning solution obtained in step T3 flow out from the discharge port, enter a centrifugal head, and spray out through the fine holes of the centrifugal head. The spinning solution is rapidly cooled to obtain solid fibers, which are collected by a cotton collector to obtain refractory fibers; among them, the centrifugal speed is 30000 r / min, and the aperture of the fine holes of the centrifugal head is 0.4 mm;

[0100] T5. Put the refractory fibers obtained in step T4 into an opening and cleaning cotton device for opening and carding to obtain a uniformly distributed fiber web, and use a needle punching machine to needle punch the fiber web to obtain a refractory fiber felt blank. The needle punching density is 500 needles / cm 2 , the needle punching depth is 13 mm, and the refractory fiber felt blank is subjected to pressure heat setting, cutting and collection to obtain a refractory fiber felt; among them, the specific operating parameters of the pressure heat setting: at a temperature of 800 °C and a pressure of 8 Kg / cm 2 Treat for 30 min under the condition, and then heat up to 1600 °C at a rate of 30 °C / min, and the pressure is 5 Kg / cm 2 Treat for 1 min under the condition;

[0101] T6. Immerse the refractory fiber felt obtained in step T5 in a water-repellent liquid, take it out and air-dry it until it no longer drips, then immerse it in a flame-retardant liquid, heat to 70 °C, keep it warm for 2 h, and dry it at 85 °C to constant weight to obtain filler C.

[0102] Preparation Example 11

[0103] The preparation method of filler D includes the following steps:

[0104] T1. Mix 800 g of alumina, 250 g of magnesia, 150 g of zirconia and 125 g of titanium dioxide, keep them warm at 300 °C for 1.5 h, and then blend and crush them to a particle size of 250 mesh to obtain the main material;

[0105] T2. Add 140 g of polymer additive A and the main material obtained in step T1 into a melting furnace, and heat to 2000 °C to obtain a molten liquid;

[0106] T3. Filter the impurities in the molten liquid obtained in step T2, and the filtrate flows into a reactor at 2300 °C, and continuously stir to obtain a spinning solution;

[0107] T4. The spinning solution obtained in step T3 flows out from the discharge port, enters the centrifuge head, and is ejected through the fine holes of the centrifuge head. The spinning solution is rapidly cooled to obtain solid fibers, which are collected by a cotton collector to obtain refractory fibers; among them, the centrifugal speed is 25000 r / min, and the aperture of the fine holes of the centrifuge head is 0.2 mm.

[0108] T5. The refractory fibers obtained in step T4 are put into an opening and cleaning cotton device for opening and carding to obtain a uniformly distributed fiber web. The fiber web is needled by a needling machine to obtain a refractory fiber felt blank. The needling density is 350 needles / cm 2 , the needling depth is 11 mm. The refractory fiber felt blank is subjected to pressure heat setting, cutting and collection to obtain a refractory fiber felt, which is the filler D; among them, the specific operating parameters of the pressure heat setting: under the conditions of a temperature of 650 °C and a pressure of 6 Kg / cm 2 for 45 min, and then heated to 1400 °C at a rate of 20 °C / min, and treated for 2 min under the conditions of a pressure of 4 Kg / cm 2 .

[0109] Preparation Example 12

[0110] The preparation method of filler E is the same as that of Preparation Example 8, except that in step T2, an equal amount of polymer additive B is used to replace polymer additive A.

[0111] Preparation Example 13

[0112] The preparation method of filler F is the same as that of Preparation Example 8, except that polymer additive A is not added in step T2.

[0113] Example 1

[0114] A lightweight and high fire-resistant grade filler type cable penetration sealing method includes the following steps:

[0115] S1. Clean the periphery of the through hole and dry it naturally. Pass the cable through the through hole, and then fix the clamping member and the support frame on the bulkhead;

[0116] S2. First, fill the filler in the gap between the cables, then fill the area between the cable and the clamping member with the filler, then seal the clamping member, the filler and the cable with the sealant, and then level the surface of the sealant with a tool to complete the sealing; among them, the sealant is prepared from Preparation Example 3, and the filler is prepared from Preparation Example 8.

[0117] Effect evaluation:

[0118] The fillers prepared in the above Preparation Examples 8-13 and Example 1 were tested and analyzed, and the specific results are as follows.

[0119] Performance test:

[0120] (1) The fillers prepared in Preparation Examples 8 - 13 were tested for heat insulation performance and flame retardancy performance:

[0121] ① Heat insulation performance: The lower the thermal conductivity, the better the heat insulation performance. The test was carried out in accordance with the national standard GB10295 - 88 "Determination of Steady - State Thermal Resistance and Related Characteristics of Thermal Insulation Materials (Heat Flow Meter Method)". The equipment used for the test was the DRS - 3A thermal conductivity tester of Xiangtan Xiangke brand. The thermal conductivity of each filler at 800 °C was tested.

[0122] ② Flame retardancy performance: The higher the oxygen index, the better the fire - prevention and flame - retardant effect. The limiting oxygen index was determined in accordance with GB / T 5454 - 1997

[0123] "Test Method for Oxygen Index of Combustion Performance of Textiles".

[0124] Table 1 Performance Test

[0125] Serial number Thermal conductivity (W / mK) Oxygen index / % Preparation Example 8 0.096 100.0 Preparation Example 9 0.102 99.9 Preparation Example 10 0.097 100.0 Preparation Example 11 0.104 91.4 Preparation Example 12 0.138 99.7 Preparation Example 13 0.165 99.4

[0126] From the results in Table 1, it can be seen that the fillers prepared in Preparation Examples 8 - 10 have good flame retardancy and good heat insulation.

[0127] When preparing the filler, compared with Preparation Example 8, Preparation Example 11 has no step T6, and the flame retardancy decreases significantly, while the influence on heat insulation is not significant.

[0128] In Preparation Example 12, an equal amount of polymer additive B was used to replace polymer additive A, that is, the mass ratio of boron phenolic resin and phenylacetyl glutamine was changed, and the cross - linking weakened. In Preparation Example 13, no polymer additive was added. Both Preparation Examples 12 - 13 caused a decrease in heat insulation and an increase in thermal conductivity, and had almost no influence on flame retardancy.

[0129] (2) The sealed cable penetration device was tested for airtightness using the sealing method of Example 1:

[0130] ① At room temperature, the device sample was installed on the airtightness test simulation chamber. The sample and the simulation chamber were connected by a flange. After the sample was installed, water was injected into the airtightness test simulation chamber. After the test chamber was filled with water, an air pressure pump was used to inject air into the chamber to increase the chamber pressure. When the pressure gauge pointer indicated 0.4 MPa, the air pumping was stopped, and at the same time, the timing started. It took 1 h, and during this period, the leakage situation at the end face of the sample was observed.

[0131] ② At room temperature, the device sample was installed on the airtightness test simulation chamber. The sample and the simulation chamber were connected by a flange. After the sample was installed, an air pressure pump was used to inject air into the chamber to increase the chamber pressure. When the pressure gauge pointer indicated 0.4 MPa, the air pumping was stopped, and at the same time, the timing started. It took 30 min, and during this period, the leakage situation at the end face of the sample was observed.

[0132] During the test, the cable penetration device withstood a water pressure of 0.4 MPa for 1 h and an air pressure of 0.4 MPa for 30 min. There was no water leakage or air leakage during the whole test process, fully demonstrating the high sealing performance of the cable penetration device.

[0133] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on this application. Although this application is disclosed as above with preferred embodiments, it is not intended to limit this application. Any person skilled in the art, without departing from the scope of the technical solution of this application, making some changes or modifications using the disclosed technical content above is equivalent to equivalent implementation cases. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution.

Claims

1. A lightweight, fire-resistant, high-filler cable penetration sealing method, characterized in that: The following steps are included: S1. Clean the area around the through hole and dry it naturally, pass the cable through the through hole, and then fix the clamp and support frame to the bulkhead; S2. First, fill the gap between cables with fillers, then fill the area between the cable and the clamp with fillers, then seal the clamp, fillers and cables with sealant, and then use tools to smooth the surface of the sealant to complete the sealing; wherein, The filler is prepared from refractory fiber felt, hydrophobic liquid and flame retardant liquid.

2. A lightweight, fire-resistant, filler-type cable penetration sealing method according to claim 1, characterized in that: The refractory fiber felt is prepared by including the following raw materials by weight: 70-90 parts of aluminum oxide, 20-30 parts of magnesium oxide, 10-20 parts of zirconium oxide, 10-15 parts of titanium dioxide, and 12-16 parts of polymer additives.

3. A lightweight, fire-resistant, filler-type cable penetration sealing method according to claim 2, characterized in that: The preparation method of the polymer auxiliary agent comprises the following steps: Mix boron phenolic resin, phenylacetylglutamine and dimethyl sulfoxide, add methanesulfonic acid, heat to 50-65°C, react for 3-4 hours, and obtain a polymer auxiliary agent.

4. A lightweight, fire-resistant, filler-type cable penetration sealing method according to claim 3, characterized in that: The mass ratio of the boron phenolic resin to phenylacetylglutamine is 1:(0.1-0.3).

5. A lightweight, fire-resistant, filler-type cable penetration sealing method according to claim 1, characterized in that: The preparation method of the filler comprises the following steps: T1. Alumina, magnesium oxide, zirconium oxide and titanium dioxide are mixed at 200-400 ° C for 1-2h and crushed to a particle size of 200-350 mesh to obtain the main material; T2. The polymer additive and the main material obtained in step T1 are added to the reactor and heated to 1800-2200°C to obtain a molten liquid; T3. The impurities in the melt obtained in step T2 are filtered, and the filtrate is flowed into a reactor at 2200-2400°C and continuously stirred to obtain a spinning solution; T4. The spinning solution obtained in step T3 flows out from the discharge port, enters the centrifugal head, and is ejected through the fine holes of the centrifugal head. The spinning solution is rapidly cooled to obtain solid fibers, which are collected by a cotton collector to obtain refractory fibers; T5. The refractory fiber obtained in step T4 is put into a cotton cleaning device for opening and combing to obtain a fiber web, the fiber web is needled by a needle punching machine to obtain a refractory fiber felt cloth, the refractory fiber felt cloth is pressurized and heat-set, cut and collected to obtain a refractory fiber felt; T6. The refractory fiber felt obtained in step T5 is immersed in a hydrophobic liquid, taken out and naturally dried until no more dripping occurs, immersed in a flame retardant liquid, heated to 70-80°C, kept warm for 1-2 hours, and dried to obtain a filler.

6. A lightweight, fire-resistant, filler-type cable penetration sealing method according to claim 5, characterized in that: The centrifugal speed of the centrifugal head in step T4 is 20000-30000 r / min, and the pore diameter of the centrifugal head is 0.1-0.4 mm.

7. A lightweight, fire-resistant, filler-type cable penetration sealing method according to claim 5, characterized in that: The specific operating parameters of the pressurized heat setting in step T5 are: temperature 500-800°C, pressure 5-8Kg / cm 2 Treat for 30-60 minutes under the same conditions, then heat to 1200-1600℃ at 10-30℃ / min, pressure 3-5Kg / cm 2 Treat for 1-3 minutes under the same conditions.

8. A lightweight, fire-resistant, filler-type cable penetration sealing method according to claim 1, characterized in that: The hydrophobic liquid in step T6 comprises the following raw materials in parts by weight: 20-30 parts of dimethyl silicone oil, 3-5 parts of emulsifier, 1-3 parts of hexadecyltriethoxysilane, and 20-50 parts of deionized water.

9. A lightweight, fire-resistant, filler-type cable penetration sealing method according to claim 8, characterized in that: The emulsifier is a composition of fatty alcohol polyoxyethylene ether and polyvinyl acetate.

10. A lightweight, fire-resistant, filler-type cable penetration sealing method according to claim 1, characterized in that: The sealant comprises the following raw materials by weight: 80-100 parts of α,ω-dihydroxypolydimethylsiloxane, 25-35 parts of dimethyl silicone oil, 25-40 parts of composite flame retardant, 10-20 parts of modified calcium carbonate, 15-30 parts of cross-linking agent, 2-6 parts of coupling agent, and 0.1-0.5 parts of catalyst; wherein the composite flame retardant is a combination of silicone resin flame retardant and expansion flame retardant.