CN112759882B - Super-soft B1-grade low-smoke halogen-free flame-retardant sheath material and preparation method thereof - Google Patents
Super-soft B1-grade low-smoke halogen-free flame-retardant sheath material and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
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- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/307—Other macromolecular compounds
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- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
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- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
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- C08L2203/00—Applications
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention provides an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material and a preparation method thereof. The sheath material comprises the following components in parts by weight: 15-35 parts of ethylene-methyl acrylate copolymer; 15-35 parts of ethylene-octene copolymer; 25-40 parts of hydrogenated styrene-butadiene block copolymer; 5-15 parts of rubber filling oil; 3-8 parts of SEBS grafted maleic anhydride; 3-8 parts of polyphenyl ether; 120-170 parts of magnesium hydroxide; 10-35 parts of aluminum hypophosphite; 3-8 parts of a smoke suppressant; 1-3 parts of an antioxidant; 1-3 parts of a lubricant; the content of styrene in the hydrogenated styrene-butadiene block copolymer is 20 to 40 weight percent; the aluminum hypophosphite is subjected to coating treatment. The maximum Shore A hardness of the sheath material is 79A, the B1-level flame retardance is met, the light transmittance of a finished product is more than or equal to 60%, and the tensile strength and the elongation at break meet the standard. Can be applied to the environment needing the ultra-soft cable sheath.
Description
Technical Field
The invention relates to the field of cable sheath materials, in particular to an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material and a preparation method thereof.
Background
The GB/T31247B 1 grade flame-retardant cable is mainly applied to dense-people occasions such as airports, stations, rail transit, large buildings and the like. GB/T31247B 1 level is fire-retardant compares in GB/T19666 and GB/T17651, has higher requirement to the heat release of sheath material and smoke release performance, and traditional sheath material is difficult to satisfy, simultaneously because low smoke and zero halogen flame retardant cable material adopts a large amount of metal hydroxide to fill, leads to the material generally on the hard side, and shao shi A hardness is all very big, if there is halogen fire-retardant cable material, first can cause the environmental protection problem, second also does not accord with GB/T31247B 1 standard yet.
For a complicated cable line in a building or a scene requiring high flexibility, a sheath material with high flexibility is required, for example, some cables have limited laying space, such as an ocean platform, and the cables are required to have a small bending radius in order to save space and facilitate laying. In order to enable the cable to obtain a smaller bending radius, on one hand, the cable structure needs to be designed reasonably and is easy to bend, and on the other hand, the sheath layer material of the cable needs to be soft and can be bent greatly. The flexible characteristic of the cable is endowed, so that the laying during construction is facilitated. Materials with higher hardness are not conducive to construction.
However, the material with lower hardness is easy to soften, has poor temperature resistance, and when the cable is burned in bundles (the high-grade bundle burning needs 20 minutes), if the carbonization efficiency is not enough, the combustible mechanism in the cable cannot be protected in time, the temperature of the box body is easily too high (over 100 ℃), so that the sheath falls off, and the flame retardance fails. Therefore, it is very difficult to achieve a B1 grade with soft jacket materials.
Chinese patent (CN 104672743A) discloses an oil-resistant corrosion-resistant super-soft cable sheath material and a preparation method thereof, although the super-soft cable sheath material meets super-soft performance, flame retardance can not meet B1-level flame retardant performance.
Disclosure of Invention
The invention provides an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material, aiming at overcoming the defect that the softness and B1-level flame retardance cannot be simultaneously met in the prior art.
The invention also aims to provide a preparation method of the super-soft B1-grade low-smoke halogen-free flame-retardant sheath material.
The invention also aims to provide the super-soft B1-grade low-smoke halogen-free flame-retardant cable sheath.
In order to realize the purpose, the invention adopts the technical scheme that:
an ultra-soft B1-grade low-smoke halogen-free flame-retardant sheath material comprises the following components in parts by weight:
the content of styrene in the hydrogenated styrene-butadiene block copolymer is 20 to 40 weight percent;
and the aluminum hypophosphite is subjected to coating treatment.
The invention firstly adopts the hydrogenated styrene-butadiene block copolymer with 20 to 40 weight percent of styrene content and the rubber filling oil to blend to reduce the hardness of the resin, thereby greatly improving the softness of the material; wherein, the hydrogenated styrene-butadiene block copolymer has excellent softness when the styrene content is 20-40%, and the styrene-butadiene block copolymer is fully mixed with rubber filling oil to ensure that the matrix resin is more uniformly distributed, thereby further improving the softness; meanwhile, the mechanical property of the material is greatly improved by utilizing the excellent compatibility of the polyphenyl ether, the SEBS grafted maleic anhydride and the hydrogenated styrene-butadiene block copolymer; the coated aluminum hypophosphite, the magnesium hydroxide and the smoke suppressant are compounded, so that the content of the magnesium hydroxide is reduced, the softness is improved, the flame retardance can be improved, and the high smoke content brought by the aluminum hypophosphite can be inhibited. The magnesium hydroxide is matched with the aluminum hypophosphite, so that a good flame-retardant and carbon-forming effect can be obtained. The aluminum hypophosphite is an acidic substance, the magnesium hydroxide is a weakly alkaline substance, and the aluminum hypophosphite is coated to effectively avoid reaction with the magnesium hydroxide, so that the flame retardance is ineffective.
The aluminum hypophosphite is coated by melamine resin.
Preferably, the ethylene-methyl acrylate copolymer has a methacrylic acid content of 18 to 36wt%. When the content of the methacrylic acid is 18-36 wt%, the resin has better tensile strength.
Preferably, the hydrogenated styrene-butadiene block copolymer has a molecular weight of 25 ten thousand or more. The tensile strength of the hydrogenated styrene-butadiene block copolymer is improved.
The rubber filling oil is naphthenic base rubber oil or paraffin base rubber oil.
Preferably, the styrene content in the SEBS grafted maleic anhydride is 20-40 wt%. When the content of the styrene is within 20-40 wt%, the softness is better.
Preferably, the grafting rate of the SEBS grafted maleic anhydride is more than or equal to 0.8%.
The graft ratio can be determined by a conventional method, for example, by acid-base titration.
Preferably, the average particle size of the aluminum hypophosphite is 50 μm or less. Has better flame retardant property when the average grain diameter is less than or equal to 50 mu m.
Preferably, the magnesium hydroxide has an average particle size of 1.5 μm or less. Has better flame retardant property when the average grain diameter is less than or equal to 1.5 mu m.
The surface of the magnesium hydroxide is coated by 3-aminopropyltriethoxysilane, and the coating rate is more than 80 percent
Preferably, the smoke suppressant is a mixture of nano montmorillonite, ammonium octamolybdate and zinc borate, wherein the weight percentage of the nano montmorillonite is 5-25 min; 35-55 parts of ammonium octamolybdate; 20 to 40 portions of zinc borate.
The molecular weight of the polyphenyl ether is 20000-60000, the polyphenyl ether is powder PPO, and the average particle size is 20-100 μm.
The ethylene-octene copolymer has a melt index of 0.5-3 g/10min and a density of 0.87-0.895g/cm measured at 190 deg.C under a load of 2.16Kg 3 。
The invention also provides a preparation method of the super-soft B1-grade low-smoke halogen-free flame-retardant sheath material, which comprises the following steps:
s1, premixing the hydrogenated styrene-butadiene block copolymer and rubber filling oil in proportion, standing, mixing the ethylene-octene copolymer and polyphenyl ether, extruding by a double-screw extruder, granulating and drying.
The length-diameter ratio L/D =48 of the double-screw extruder, and the set temperature of each zone is 160-200 ℃.
S2, putting the dried material obtained in the step S1, ethylene-methyl acrylate copolymer, SEBS grafted maleic anhydride, magnesium hydroxide, aluminum hypophosphite, a smoke suppressant, an antioxidant and a lubricant into an internal mixer in proportion, mixing, cooling, discharging and granulating.
The temperature of the internal mixer is 145-160 ℃. The banburying time is not less than 10min.
The super-soft B1-level low-smoke halogen-free flame-retardant sheath material is applied to preparing a cable sheath.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an ultra-soft B1-grade low-smoke halogen-free flame-retardant cable sheath material, which is prepared by blending hydrogenated styrene-butadiene block copolymer with the styrene content of 20-40 wt%, rubber filling oil and SEBS grafted maleic anhydride to reduce the hardness of resin and greatly improve the softness of the material. The maximum Shore A hardness of the sheath material is 79A, the B1-level flame retardance is met, the light transmittance of a finished product is more than or equal to 60%, the tensile strength and the elongation at break which meet the standard are achieved, and the cable sheath material can be applied to the environment needing the ultra-soft cable sheath.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, but the embodiments of the present invention are not limited thereto.
The reagents, methods and equipment used in the invention are conventional in the technical field unless otherwise specified.
The following examples and comparative examples employ the following starting materials:
ethylene-methyl acrylate copolymer a: the methacrylic acid content is 18wt%, and TC 121Molding brand of Exxon Mobil is adopted;
ethylene-methyl acrylate copolymer B: methacrylic acid content 20wt%, using a mark of 20MA08 from Arkema, france;
ethylene-methyl acrylate copolymer C: methacrylic acid content 24wt%, using a 24MA005 designation from Acoma, france;
ethylene-methyl acrylate copolymer D: the content of methacrylic acid is 10wt%, and SP1402 brand of American West lake chemical industry is adopted;
ethylene-methyl acrylate copolymer E: the methacrylic acid content is 31 wt.%, the 29MA003 brand of Arkema, france;
hydrogenated styrene-butadiene block copolymer a: the styrene content is 20wt%, and the molecular weight is 30 ten thousand by adopting a commercial product;
hydrogenated styrene-butadiene block copolymer B1: the styrene content is 28wt%, and the molecular weight is 30 ten thousand by adopting a commercial product;
hydrogenated styrene-butadiene block copolymer C: the styrene content is 32wt%, and the molecular weight is 30 ten thousand by adopting a commercial product;
hydrogenated styrene-butadiene block copolymer D: the styrene content is 18wt%, and the molecular weight is 30 ten thousand by adopting a commercial product;
hydrogenated styrene-butadiene block copolymer E: the styrene content is 35wt%, and the molecular weight is 30 ten thousand by adopting a commercial product;
hydrogenated styrene-butadiene block copolymer B2: the styrene content is 28wt%, and the molecular weight is 25 ten thousand by adopting a commercial product;
hydrogenated styrene-butadiene block copolymer B3: the styrene content is 28wt%, and the molecular weight is 15 ten thousand by adopting a commercial product;
hydrogenated styrene-butadiene block copolymer B4: the styrene content is 28wt%, and the molecular weight is 35 million by adopting a commercial product;
hydrogenated styrene-butadiene block copolymer B5: the styrene content was 28% by weight, and the molecular weight was 45 million using a commercially available product;
rubber extender oil a: adopting KN4006 of the medium petroleum Caramay;
rubber extender oil B: adopting Mognoni petrochemical 32# white oil;
SEBS grafted maleic anhydride A: the content of styrene is 20wt%, the molecular weight is 30 ten thousand, and the grafting rate is 1%;
SEBS grafting maleic anhydride B: the styrene content is 28wt%, the molecular weight is 30 ten thousand, and the grafting rate is 1%;
SEBS grafted maleic anhydride C: the content of styrene is 33wt%, the molecular weight is 30 ten thousand, and the grafting rate is 1%;
SEBS grafting maleic anhydride D: styrene content 10wt%, molecular weight 30 ten thousand, grafting rate 1%;
SEBS grafting maleic anhydride E: the content of styrene is 40wt%, the molecular weight is 30 ten thousand, and the grafting rate is 1%;
the SEBS grafted maleic anhydride is prepared by adopting the following steps of: 1 twin-screw, feeding an initiator and maleic anhydride in proportion on a side feeding way, wherein the processing temperature of a twin-screw extruder is 175-200 ℃. Selecting commercially available SEBS with molecular weight of 30 ten thousand and different styrene content grades for melt grafting;
ethylene-octene copolymer: POE 58750 of Dow chemical is used, and the density is as follows: 0.870, melt finger: 1g/10min at 190 ℃ under the condition of 2.16 Kg;
polyphenylene ether: the adopted LanxingCHE LXR-045 brand;
magnesium hydroxide: the magnesium hydroxide is prepared from magnesium hydroxide F5 of Asnfoer company of Shandong, and has an average particle size of 1.5 μm;
coating with magnesium hydroxide; heating magnesium hydroxide to 60 ℃ in a high-speed mixer, and adding 3-aminopropyltriethoxysilane according to a proportion; mixing at high speed for 30 minutes;
aluminum hypophosphite: the brand of the Lidao new material is M-116H, melamine resin is coated, and the average grain diameter is 10 mu M;
smoke suppressant: 5 parts of nano montmorillonite; 35 parts of ammonium octamolybdate; 40 parts of zinc borate;
the nano-montmorillonite is purchased from: the Zhejiang Fenghong Henghong Co., ltd is DK4;
ammonium octamolybdate was purchased from: ammonium octamolybdate produced by Hubeixin Hongli chemical industry;
zinc borate was purchased from: ZB-03 of Anhui Shitong New materials GmbH;
antioxidant: adopting the combination of an antioxidant 1010 and an antioxidant 168 with the mass ratio of 1:1;
lubricant: HONEYWELL polyethylene wax AC-6A is adopted.
The present invention will be described in detail with reference to examples and comparative examples.
The following examples and comparative examples were all prepared by the following method to obtain super soft B1 grade low smoke zero halogen flame retardant sheath
Weighing the components according to the weight ratio in tables 1-3; the method comprises the following specific steps:
s1, premixing the hydrogenated styrene-butadiene block copolymer and rubber filling oil in proportion, standing, mixing the ethylene-octene copolymer and polyphenyl ether, extruding by a double-screw extruder, granulating and drying.
The length-diameter ratio L/D =48 of the double-screw extruder, and the set temperature of each zone is 160-200 ℃.
S2, putting the dried material obtained in the step S1, ethylene-methyl acrylate copolymer, SEBS grafted maleic anhydride, magnesium hydroxide, aluminum hypophosphite, a smoke suppressant, an antioxidant and a lubricant into an internal mixer in proportion, mixing, cooling, discharging and granulating.
The temperature of the internal mixer is 145-160 ℃. And banburying time is 15min.
Examples 1 to 5
TABLE 1 formulations (parts) of examples 1 to 5
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Ethylene-methyl acrylate copolymer B | 25 | 25 | 25 | 25 | 25 |
| Ethylene-octene copolymer | 25 | 25 | 25 | 25 | 25 |
| Hydrogenated styrene-butadiene Block copolymer B1 | 30 | — | — | — | — |
| Hydrogenated styrene-butadiene Block copolymer B2 | — | 30 | — | — | — |
| Hydrogenated styrene-butadiene Block copolymer B3 | — | — | 30 | — | — |
| Hydrogenated styrene-butadiene Block copolymer B4 | — | — | — | 30 | — |
| Hydrogenated styrene-butadiene Block copolymer B5 | — | — | — | — | 30 |
| SEBS grafting maleic anhydride B | 4 | 4 | 4 | 4 | 4 |
| Rubber extender oil A | 8 | 8 | 8 | 8 | 8 |
| Polyphenylene ether | 8 | 8 | 8 | 8 | 8 |
| Magnesium hydroxide | 160 | 160 | 160 | 160 | 160 |
| Aluminum hypophosphite | 25 | 25 | 25 | 25 | 25 |
| Smoke suppressant | 4 | 4 | 4 | 4 | 4 |
| Antioxidant agent | 2 | 2 | 2 | 2 | 2 |
| Lubricant agent | 2 | 2 | 2 | 2 | 2 |
Examples 6 to 12
TABLE 2 formulations (parts) of examples 6 to 12
Examples 13 to 19
TABLE 3 formulations (parts) of examples 13 to 19
Comparative examples 1 to 6
TABLE 4 formulations of comparative examples 1 to 6 (parts)
The super-soft B1-grade low-smoke halogen-free flame-retardant cable sheath material prepared in the above examples 1-19 and comparative examples 1-6 is subjected to the following performance tests, and the reference standards and methods for the tests are as follows:
according to the test method of GB/T32129-2015 low-smoke halogen-free material standard and GB 31247-2014B1 flame-retardant grade standard,
the Shore A hardness test method adopts a GB 2411 specified method for testing:
the test method of the finished product light transmittance adopts a method specified in GB/T17651-2008 to test:
TABLE 5 test data for each of the examples and comparative examples
From examples 1 to 5, it can be seen that the higher the molecular weight of the hydrogenated styrene-butadiene block copolymer, the better the mechanical properties of the material.
From examples 1 and 6 to 8, it can be seen that the lower the styrene content of the hydrogenated styrene-butadiene block copolymer, the lower the hardness of the material, the better the flexibility, but the lower the tensile strength.
From examples 1 and 9 to 12, the lower the styrene content of the SEBS-grafted maleic anhydride, the lower the hardness of the material and the better the flexibility,
from examples 1 and 13 to 16, the higher the methacrylic acid content of the ethylene-methyl acrylate copolymer, the better the smoke density performance of the material, and the higher the mechanical properties, and the methacrylic acid content does not affect the softness of the material.
From examples 17 to 19, the higher the content of the extender oil, the lower the hardness of the material, but the mechanical properties of the material were somewhat reduced.
From comparative examples 1 to 6, the material hardness was too high without extender oil or hydrogenated styrene-butadiene block copolymer; the hydrogenated styrene-butadiene block copolymer is insufficient, and the hardness of the material is too high; under the condition that maleic anhydride is grafted on the hydrogenated styrene-butadiene block copolymer, the mechanical property of the material can not meet the national standard requirement; from comparative example 3, it can be seen that the requirement of adding more magnesium hydroxide can not satisfy B1 grade without adding aluminum hypophosphite, and the Shore A hardness is larger.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The super-soft B1-grade low-smoke halogen-free flame-retardant sheath material is characterized by comprising the following components in parts by weight:
15-35 parts of ethylene-methyl acrylate copolymer;
15-35 parts of an ethylene-octene copolymer;
25-40 parts of hydrogenated styrene-butadiene block copolymer;
5 to 15 parts of rubber filling oil;
5363 parts of SEBS grafted maleic anhydride 3~8;
5363 parts of polyphenyl ether 3~8;
120 to 170 parts of magnesium hydroxide;
10-35 parts of aluminum hypophosphite;
5363 parts of smoke suppressant 3~8;
5363 parts of antioxidant 1~3;
lubricant 1~3 parts;
the content of styrene in the hydrogenated styrene-butadiene block copolymer is 20 to 40wt%;
the aluminum hypophosphite is subjected to coating treatment; the content of methacrylic acid in the ethylene-methyl acrylate copolymer is 18 to 36 wt%; the styrene content of the SEBS grafted maleic anhydride is 20 to 40wt%.
2. The super-soft B1-grade low-smoke halogen-free flame-retardant sheath material as claimed in claim 1, wherein the molecular weight of the hydrogenated styrene-butadiene block copolymer is greater than or equal to 25 ten thousand.
3. The super-soft B1-grade low-smoke halogen-free flame-retardant sheath material according to claim 1, wherein the grafting ratio of the SEBS grafted maleic anhydride is greater than or equal to 0.8%.
4. The super-soft B1-grade low-smoke halogen-free flame-retardant sheath material as claimed in claim 1, wherein the average particle size of the aluminum hypophosphite is not more than 50 μm.
5. The super-soft B1-grade low-smoke halogen-free flame-retardant sheath material as claimed in claim 1, wherein the magnesium hydroxide has an average particle size of 1.5 μm or less.
6. The super-soft B1-grade low-smoke halogen-free flame-retardant sheath material as claimed in claim 1, wherein the smoke suppressant is a mixture of nano montmorillonite, ammonium octamolybdate and zinc borate, wherein the nano montmorillonite accounts for 5-25 min by weight; 35 to 55 parts of ammonium octamolybdate; 20 to 40 parts of zinc borate.
7. The preparation method of the super-soft B1-grade low-smoke halogen-free flame-retardant sheath material according to any one of claims 1~6, comprising the following steps:
s1, premixing the hydrogenated styrene-butadiene block copolymer and rubber filling oil according to a proportion, standing, mixing the ethylene-octene copolymer and polyphenyl ether, extruding by a double-screw extruder, granulating and drying;
and S2, putting the dried material obtained in the step S1, ethylene-methyl acrylate copolymer, SEBS grafted maleic anhydride, magnesium hydroxide, aluminum hypophosphite, a smoke suppressant, an antioxidant and a lubricant into an internal mixer in proportion, internally mixing, discharging and granulating.
8. A cable jacket comprising the super-soft B1 grade low smoke zero halogen flame retardant jacket material of any one of claims 1~6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011551913.4A CN112759882B (en) | 2020-12-24 | 2020-12-24 | Super-soft B1-grade low-smoke halogen-free flame-retardant sheath material and preparation method thereof |
| PCT/CN2021/138867 WO2022135271A1 (en) | 2020-12-24 | 2021-12-16 | Ultra-soft b1-level low-smoke halogen-free flame-retardant sheath material and preparation method therefor |
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| CN202011551913.4A CN112759882B (en) | 2020-12-24 | 2020-12-24 | Super-soft B1-grade low-smoke halogen-free flame-retardant sheath material and preparation method thereof |
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| CN112759882B true CN112759882B (en) | 2022-12-06 |
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| CN112759882B (en) * | 2020-12-24 | 2022-12-06 | 金发科技股份有限公司 | Super-soft B1-grade low-smoke halogen-free flame-retardant sheath material and preparation method thereof |
| CN114410051B (en) * | 2021-12-28 | 2023-07-11 | 成都金发科技新材料有限公司 | Insulation coating composite material and preparation method and application thereof |
| CN116543965B (en) * | 2023-07-05 | 2023-09-22 | 南洋电缆（天津）有限公司 | Low-smoke halogen-free flame-retardant cable sheath, B1-level flame-retardant cable and preparation method thereof |
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| CN106221035A (en) * | 2016-08-29 | 2016-12-14 | 四川金开特种电线电缆有限公司 | A kind of flame-retardant cable material |
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| CN112759882B (en) * | 2020-12-24 | 2022-12-06 | 金发科技股份有限公司 | Super-soft B1-grade low-smoke halogen-free flame-retardant sheath material and preparation method thereof |
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- 2020-12-24 CN CN202011551913.4A patent/CN112759882B/en active Active
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- 2021-12-16 WO PCT/CN2021/138867 patent/WO2022135271A1/en active Application Filing
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| CN106280034A (en) * | 2016-08-29 | 2017-01-04 | 四川金开特种电线电缆有限公司 | A kind of halogen-free flameproof cable material |
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| WO2022135271A1 (en) | 2022-06-30 |
| CN112759882A (en) | 2021-05-07 |
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