CN110408276B - Material for cable incoming line fireproof plugging - Google Patents
Material for cable incoming line fireproof plugging Download PDFInfo
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- CN110408276B CN110408276B CN201910736707.1A CN201910736707A CN110408276B CN 110408276 B CN110408276 B CN 110408276B CN 201910736707 A CN201910736707 A CN 201910736707A CN 110408276 B CN110408276 B CN 110408276B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D123/04—Homopolymers or copolymers of ethene
- C09D123/08—Copolymers of ethene
- C09D123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C09D123/0853—Vinylacetate
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
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- C—CHEMISTRY; METALLURGY
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C08L2201/00—Properties
- C08L2201/04—Antistatic
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- C08L2205/00—Polymer mixtures characterised by other features
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Abstract
The invention belongs to the technical field of high polymer materials, and particularly relates to a material for fireproof plugging of a cable incoming line. The raw materials comprise: the flame-retardant polyethylene glycol-ethylene-vinyl acetate copolymer comprises, by weight, 100-120 parts of ethylene-vinyl acetate copolymer (EVA), 20-50 parts of maleic anhydride grafted polypropylene, 20-50 parts of tung oil, 10-20 parts of graphene nanofiber, 5-10 parts of Azodicarbonamide (AC), 10-20 parts of a flame retardant, 5-9 parts of an initiator, 8-12 parts of stearic acid and 8-12 parts of epoxy soybean octyl oleate. The material disclosed by the invention has the characteristics of high closed porosity, good temperature change resistance, small compression deformation, excellent flame retardance and antistatic property, is suitable for electric field packaging, and is particularly suitable for cable incoming line fireproof plugging in a transformer substation.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a material for fireproof plugging of a cable incoming line.
Background
With the rapid development of electric power in China in recent years, higher and higher requirements are placed on ensuring the safe operation of an electric power system and improving the economic efficiency of the system, and particularly, various terminal boxes, control screens, power distribution cabinets and other devices need to be protected. As the fire danger happens once, the fire enters the box body, the damage of components in the box body can be caused, the fault can be caused, even serious accidents can be caused, the fire prevention problem in the power system is particularly worthy of attention, various switch terminal boxes in a transformer substation, cables of the inlet and outlet of devices such as a protection disc, a control panel, a power distribution cabinet and the like are usually plugged by adopting common fire-proof mud, but the material can be softened in summer or in the presence of heat, cracks can be formed by contraction in low temperature, when the number of the inlet cables is large, gaps exist among the cables, the plugging work is difficult to carry out, and the fire-proof mud also has the defects of irregular shape, flow collapse, cracks, incompact and the like, and has great hidden danger.
Aiming at the problems, a novel expansion type fireproof coating appears on the market at present, and the coating is the same as a common coating film at normal temperature, and under the action of flame or high temperature, the coating expands to form a nonflammable porous carbon layer, so that the heating of a fire source to a base material can be slowed down or cut off, and the flame-retardant effect is achieved; however, the problems of unobvious fireproof effect, short flame-retardant time and the like still exist, and particularly, the problems of poor antistatic effect and the like exist in the application of power systems.
Disclosure of Invention
The invention aims to provide a fireproof and flame-retardant plugging material suitable for incoming cable wires in a transformer station according to the defects of the prior art. The material has the characteristics of high closed cell rate, good temperature change resistance, small compression deformation, excellent flame retardance and antistatic property.
The utility model provides a material suitable for fire-retardant shutoff of cable inlet wire in transformer station, its raw materials include: the flame-retardant polyethylene glycol-ethylene-vinyl acetate copolymer comprises, by weight, 100-120 parts of ethylene-vinyl acetate copolymer (EVA), 20-50 parts of maleic anhydride grafted polypropylene, 20-50 parts of tung oil, 10-20 parts of graphene nanofiber, 5-10 parts of Azodicarbonamide (AC), 10-20 parts of a flame retardant, 5-9 parts of an initiator, 8-12 parts of stearic acid and 8-12 parts of epoxy soybean octyl oleate.
The flame retardant is antimony trioxide; the initiator is dibenzoyl peroxide.
The preparation method comprises the following steps: adding the graphene nano-fibers into concentrated sulfuric acid, and stirring and reacting for 1-3 hours at 60 ℃ to obtain acidified graphene nano-fibers; adding EVA, maleic anhydride grafted polypropylene, tung oil, acidified graphene nano-fibers, epoxy soybean octyl oleate and stearic acid into an internal mixer, internally mixing for 10min at the temperature of 100-150 ℃, adding azodicarbonamide, antimony trioxide and dibenzoyl peroxide after uniformly mixing, pouring materials after internally mixing for 5min, and then carrying out open mixing at the temperature of 80-90 ℃ to obtain rubber compound; and (3) performing lamination compounding on the rubber compound, placing the rubber compound into a mold for foaming and vulcanization, specifically foaming at the temperature of 160-190 ℃ for 20min to obtain the material.
The invention has the following remarkable advantages:
(1) the compatibility of EVA and a maleic anhydride grafted polypropylene material is poor, and the viscosity of the maleic anhydride grafted polypropylene is strong, so that the compatibility performance is poor.
(2) The material prepared by the invention has small compression deformation, and meanwhile, the halogen-free flame retardant system is used for replacing the existing halogen flame retardant, so that the generation of toxic gas during accidental combustion can be avoided, and the use safety is high.
(3) According to the invention, the graphene nanofiber is pretreated and added into the EVA and maleic anhydride grafted polypropylene material composite system, so that the dispersion performance is good, the antistatic capability is excellent, and the graphene nanofiber is suitable for fireproof flame-retardant plugging of cable incoming lines in a power substation.
(4) The plugging material system prepared by adopting EVA and maleic anhydride grafted polypropylene as main components and adding different additives has strong binding power, can react with surface active groups of various building materials, and is suitable for being used in occasions such as buildings, factories, power stations and the like.
Drawings
FIG. 1 is a construction drawing of a cable incoming line fireproof flame-retardant plugging material in site;
FIG. 2 is a construction drawing of the fireproof and flame-retardant plugging material for incoming cables in situ.
Detailed Description
For further disclosure, but not limitation, the present invention is described in further detail below with reference to examples.
Example 1
The utility model provides a material suitable for fire-retardant shutoff of cable inlet wire in transformer station, its raw materials include: the material comprises, by weight, 100 parts of ethylene-vinyl acetate copolymer (EVA), 20 parts of maleic anhydride grafted polypropylene, 30 parts of tung oil, 10 parts of graphene nano-fibers, 6 parts of Azodicarbonamide (AC), 14 parts of antimony trioxide, 6 parts of dibenzoyl peroxide, 9 parts of stearic acid and 8 parts of epoxy soybean octyl oleate.
The preparation method comprises the following steps: adding the graphene nano-fibers into concentrated sulfuric acid, and stirring and reacting for 1-3 hours at 60 ℃ to obtain acidified graphene nano-fibers; adding EVA, maleic anhydride grafted polypropylene, tung oil, acidified graphene nano-fibers, epoxy soybean octyl oleate and stearic acid into an internal mixer, banburying at 100 ℃ for 10min, uniformly mixing, adding azodicarbonamide, antimony trioxide and dibenzoyl peroxide, banburying for 5min, pouring, and then carrying out open milling at 80 ℃ to obtain a rubber compound; and (3) laminating and compounding the rubber compound, placing the rubber compound into a mold for foaming and vulcanizing, specifically foaming at 160 ℃ for 20min to obtain the material.
Example 2
The utility model provides a material suitable for fire-retardant shutoff of cable inlet wire in transformer station, its raw materials include: the composite material comprises, by weight, 110 parts of ethylene-vinyl acetate copolymer (EVA), 40 parts of maleic anhydride grafted polypropylene, 40 parts of tung oil, 15 parts of graphene nano-fibers, 6 parts of Azodicarbonamide (AC), 13 parts of antimony trioxide, 5 parts of dibenzoyl peroxide, 10 parts of stearic acid and 10 parts of epoxy soybean octyl oleate.
The preparation method comprises the following steps: adding the graphene nano-fibers into concentrated sulfuric acid, and stirring and reacting for 1-3 hours at 60 ℃ to obtain acidified graphene nano-fibers; adding EVA, maleic anhydride grafted polypropylene, tung oil, acidified graphene nano-fibers, epoxy soybean octyl oleate and stearic acid into an internal mixer, banburying at 100 ℃ for 10min, uniformly mixing, adding azodicarbonamide, antimony trioxide and dibenzoyl peroxide, banburying for 5min, pouring, and then carrying out open milling at 80 ℃ to obtain a rubber compound; and (3) laminating and compounding the rubber compound, placing the rubber compound into a mold for foaming and vulcanizing, specifically foaming at 160 ℃ for 20min to obtain the material.
Example 3
The utility model provides a material suitable for fire-retardant shutoff of cable inlet wire in transformer station, its raw materials include: the high-performance polyethylene composite material comprises, by weight, 120 parts of ethylene-vinyl acetate copolymer (EVA), 50 parts of maleic anhydride grafted polypropylene, 50 parts of tung oil, 15 parts of graphene nano-fibers, 10 parts of Azodicarbonamide (AC), 20 parts of antimony trioxide, 9 parts of dibenzoyl peroxide, 10 parts of stearic acid and 10 parts of epoxy soybean octyl oleate.
The preparation method comprises the following steps: adding the graphene nano-fibers into concentrated sulfuric acid, and stirring and reacting for 1-3 hours at 60 ℃ to obtain acidified graphene nano-fibers; adding EVA, maleic anhydride grafted polypropylene, tung oil, acidified graphene nano-fibers, epoxy soybean octyl oleate and stearic acid into an internal mixer, banburying at 150 ℃ for 10min, uniformly mixing, adding azodicarbonamide, antimony trioxide and dibenzoyl peroxide, banburying for 5min, pouring, and then carrying out open milling at 90 ℃ to obtain a rubber compound; and (3) laminating and compounding the rubber compound, placing the rubber compound into a mould for foaming and vulcanizing, specifically foaming at 190 ℃ for 20min to obtain the material.
And (3) testing the material performance:
test method
Preparation of test pieces
1.1 selection of the substrate
The base material for test is full-plastic aluminum core cable, the oxygen index value of the sheath is 25.0 +/-0.5, the outer diameter of the cable is 30mm +/-2 mm, the conductor is four-core, and the sectional area of the conductor is 50mm2×3+25mm2X 1, the cable surface should be flat and smooth.
1.2 test piece number and Length
The number and length of the test pieces should meet the requirements of table 1.
TABLE 1 test piece number and Length
| Item | Length, mm | Number of |
| Oil resistance | 125 | 3 |
| Resistance to hydrochloric acid corrosion | 125 | 3 |
| Moisture and heat resistance | 125 | 3 |
| Resistance to freeze-thaw cycling | 125 | 3 |
| Bending resistance | 2000 | 3 |
| Fire resistance | 3500 | 13 |
1.3 coating of the test pieces
The test piece is brushed or sprayed according to the specification of the product, the interval time between two brushing is not less than 24 hours, and each brushing is uniform. The flame-retardant test piece should not be coated with cable fire-retardant paint at one end thereof with a length of 500 mm.
1.4 Dry coating thickness
The dry coating thickness of the cable fireproof coating should be 1mm plus or minus 0.1mm.
1.5 Condition Regulation
After the coating thickness of the test piece reaches the specified coating thickness, the test piece is regulated to be of constant mass (the mass change is not more than 0.5 percent by weighing twice 24 hours) under the environmental conditions of the temperature of 23 +/-2 ℃ and the relative humidity (50 +/-5)%.
1.6 determination of the Dry coating thickness
And determining 8 measuring points at a position 100mm away from the coating end of the cable according to the distance of 400mm, measuring the perimeter of the cable before coating and the perimeter of the measuring point after maintenance and dry operation of coating on the measuring points, wherein the measured data is accurate to one decimal point, and calculating the dry coating thickness of each measuring point by the formula (1).
In the formula: i-measuring point number (1-8);
δidry coating thickness in mm at the measuring point
Li-the actual circumference of the blank cable, mm;
Limeasured circumference after painting of the cable coating.
The dry coating thickness is the average of the dry coating thicknesses at 8 stations.
2.1 test environmental conditions
The three tests of oil resistance, salt corrosion resistance and bending resistance of the coating are carried out under the environmental conditions of the temperature of 23 +/-2 ℃ and the relative humidity (50 +/-5)%.
2.2 State in the vessel
The container for storing the paint is opened, the sample is stirred, and whether the paint is agglomerated or not and whether the paint is uniform or not are observed.
2.3 fineness
The test was carried out as specified in GB 6753.1.
2.4 viscosity
The test was carried out as specified in GB/T1723.
2.5 drying time
The test was carried out according to the regulation of GB 1728 (method A).
2.6 oil resistance
2.6.1 the test piece after the state adjustment is subjected to end capping by applying a mixture of paraffin and rosin in a ratio of 1: 1 before the test, wherein the end capping height is 3-4 mm.
2.6.2 put the end-capped ends of the three test pieces into three glass containers filled with machine oil, respectively, and the depth of immersion is the length of the test piece 2/3.
2.6.3 during the soaking period, should be observed and recorded every 24 h. And taking out the test piece after the soaking period, sucking the immersion liquid on the surface of the test piece by using filter paper, and visually checking whether the test piece has wrinkling, peeling and the like and recording. The foamed test piece should have a substantial recovery of the coating within 24 hours under standard environmental conditions.
At least two of the three test pieces should satisfy the oil resistance requirements specified in table 1.
2.7 resistance to salt corrosion
The end capping of the 2.7.1 test pieces was performed as specified in article 2.6.1.
2.7.2 put the end-sealed ends of the three test pieces into three glass containers respectively containing 3% sodium chloride solution, and the depth of immersion is the length of the test piece 2/3.
2.7.3 during the soaking period, should be observed and recorded every 24 h. And taking out the test piece after the soaking period, sucking the immersion liquid on the surface of the test piece by using filter paper, and visually checking whether the test piece has wrinkling, peeling and the like and recording. The foamed test piece should have a substantial recovery of the coating within 24 hours under standard environmental conditions.
At least two of the three test pieces should meet the specified requirements for salt corrosion resistance of table 1.
2.8 Damp-heat resistance
2.8.1 test pieces are placed in a temperature and humidity adjusting box with the temperature of 47 +/-2 ℃ and the relative humidity (95 +/-3)% for continuous test for 7d.
2.8.2 the test pieces should be observed and recorded every 24 h. And (4) taking out the test piece at the end of the test period, visually checking the test piece, and recording whether the test piece has the phenomena of bubbling, falling and the like.
At least two of the three test pieces should satisfy the specified requirements for moist heat resistance in Table 1.
2.9 resistance to Freeze-thaw cycling
2.9.1 hanging the test pieces on the test rack, wherein the distance between the test pieces is not less than 10 mm. And then placing the test stand with the test piece in a low-temperature box at minus 20 +/-2 ℃ for continuous low-temperature test for 3 h.
2.9.2 after the low-temperature test, immediately putting the test piece into an oven with the temperature of 50 +/-2 ℃, and keeping the temperature for 3 hours.
2.9.3 the test piece after the constant temperature test is placed in the environment with the temperature of 23 +/-2 ℃ and the relative humidity of 50 +/-5%
The mixture is placed under the condition for 18 hours.
2.9.4 the test procedure of items 2.9..1, 2.9..2, and 2.9..3 above is defined as a cycle period.
2.9..5 after each cycle the coating was visually inspected for blistering, flaking, cracking and the like and recorded.
After the specified number of cycles has been completed, at least two of the three test pieces should meet the specified requirements for freeze-thaw resistance in table 1.
2.10 bending resistance
And (3) winding the test piece around a cylinder with the diameter of 570mm +/-5 mm at a constant speed for one circle, wherein the operation is completed within 10-20 s. And (4) after the test piece is restored to the original state, the operation is carried out in the reverse direction according to the method, and then the test piece is restored to the original state. The test piece was visually inspected for the presence of delamination, peeling, cracking, etc. and recorded.
At least two of the three test pieces should meet the specified requirements for flexural resistance of Table 1.
2.11 fire resistance
2.11.1 tests are carried out according to class A of GB 12666.5-90, the installation of the test piece is in accordance with the regulation of No. 3.3 in GB 12666.5-90, and one end of the test piece, which is not coated with the cable fireproof paint, is arranged below a ladder.
2.11.2 the firing time was 40min as specified for the class A cable test.
2.11.3 after the complete cessation of burning (if the test piece still burns more than can be extinguished forcibly after 1h of stopping the fire), the intumescent coating is removed and the surface of the test piece is pressed with a sharp object, which changes from elastic to brittle (powdering) indicating that the test piece substrate begins to char. And then measuring the maximum distance from the bottom edge of the nozzle of the blast lamp to the carbonization starting position on the surface of the sample base material by using a steel tape or a ruler, and obtaining the carbonization height (m) of the test piece.
The test results are shown in Table 2.
TABLE 2 test items and test results of the inventive coating on test pieces
Application example 1
And (3) construction description:
1. and opening the cover plate of the cable groove box, and cleaning the cable and the inner surface of the groove box to ensure that the cable and the groove box are dry and have no dust, oil stain and sundries.
2. The section bar of the foam fireproof plugging material prepared in the example 1 is cut according to the internal size of the groove box and the distribution condition of the cables, and the longitudinal length of the section bar is not less than 120 mm.
3. And (3) putting the cut section into a groove box to pass through the floor slab section, and tightly bonding the section with the cable and the groove box by using fireproof sealant without gaps.
4. And (3) after the plugging body is trimmed, coating cable fireproof paint on the surface and two ends of the plugging body by 1m of cables respectively, and fastening a groove box cover plate.
The field diagrams are shown in fig. 1 and 2.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (1)
1. The utility model provides a material suitable for fire-retardant shutoff of cable inlet wire in transformer station which characterized in that: the raw materials are as follows: according to the weight parts, 100-120 parts of ethylene-vinyl acetate copolymer EVA, 20-50 parts of maleic anhydride grafted polypropylene, 20-50 parts of tung oil, 10-20 parts of graphene nano fiber, 10-10 parts of azodicarbonamide AC5, 10-20 parts of antimony trioxide, 5-9 parts of dibenzoyl peroxide, 8-12 parts of stearic acid and 8-12 parts of epoxy soybean octyl oleate; the preparation method comprises the following steps: adding the graphene nano-fibers into concentrated sulfuric acid, and stirring and reacting for 1-3 hours at 60 ℃ to obtain acidified graphene nano-fibers; adding EVA, maleic anhydride grafted polypropylene, tung oil, acidified graphene nano-fibers, epoxy soybean octyl oleate and stearic acid into an internal mixer, internally mixing for 10min at the temperature of 100-150 ℃, adding azodicarbonamide, antimony trioxide and dibenzoyl peroxide after uniformly mixing, pouring materials after internally mixing for 5min, and then carrying out open mixing at the temperature of 80-90 ℃ to obtain rubber compound; and (3) performing lamination compounding on the rubber compound, placing the rubber compound into a mold for foaming and vulcanization, specifically foaming at the temperature of 160-190 ℃ for 20min to obtain the material.
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| CN201910736707.1A CN110408276B (en) | 2019-08-10 | 2019-08-10 | Material for cable incoming line fireproof plugging |
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| CN201910736707.1A CN110408276B (en) | 2019-08-10 | 2019-08-10 | Material for cable incoming line fireproof plugging |
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2019
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| KR20170142739A (en) * | 2016-06-20 | 2017-12-28 | 신기전선 (주) | Non-halogen-based insulated wire coating composition with high fire-retardant |
| CN106188807A (en) * | 2016-07-14 | 2016-12-07 | 福州大学 | A kind of anti-electrostatic fire retardant EVA/PVC composite foam material and preparation method thereof |
| CN107163367A (en) * | 2017-06-21 | 2017-09-15 | 常州碳润新材料科技有限公司 | A kind of graphene EVA g MA foaming damping material and preparation method thereof |
| CN108219260A (en) * | 2018-01-23 | 2018-06-29 | 江苏理工学院 | A kind of halogen-free flameproof EVA thermoplastic elastic materials and preparation method thereof |
| CN108976585A (en) * | 2018-07-02 | 2018-12-11 | 墨烯材料科技有限公司 | A kind of ultralight foamed material of graphene/EVA and preparation method thereof |
| CN109897273A (en) * | 2019-03-18 | 2019-06-18 | 福州大学 | A kind of EVA foam and preparation method thereof of composite flame-retardant agent graft modification |
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