CN114276610A - Low-hardness low-smoke halogen-free flame-retardant polyolefin cable material and preparation method thereof - Google Patents
Low-hardness low-smoke halogen-free flame-retardant polyolefin cable material and preparation method thereof Download PDFInfo
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- 239000003063 flame retardant Substances 0.000 title claims abstract description 87
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- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 5
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical group [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- ZJKCITHLCNCAHA-UHFFFAOYSA-K aluminum dioxidophosphanium Chemical compound [Al+3].[O-][PH2]=O.[O-][PH2]=O.[O-][PH2]=O ZJKCITHLCNCAHA-UHFFFAOYSA-K 0.000 claims description 4
- 239000004114 Ammonium polyphosphate Substances 0.000 claims description 3
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- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 3
- ZQKXQUJXLSSJCH-UHFFFAOYSA-N melamine cyanurate Chemical compound NC1=NC(N)=NC(N)=N1.O=C1NC(=O)NC(=O)N1 ZQKXQUJXLSSJCH-UHFFFAOYSA-N 0.000 claims description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims description 2
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 claims description 2
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 claims description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 2
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- 229920001910 maleic anhydride grafted polyolefin Polymers 0.000 claims description 2
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Abstract
The invention relates to the technical field of polymer composite materials, and particularly discloses a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material and a preparation method thereof. The cable material comprises the following components in parts by weight: polyolefin elastomer: 8-25 parts, polyolefin plastomer: 6-15 parts of bimodal polyethylene: 2-10 parts of polyethylene: 0-8 parts of a compatilizer: 3-6 parts of inorganic flame retardant: 50-70 parts of a synergistic flame retardant: 0 to 20 parts, P-N series flame retardant: 0-15 parts of antioxidant: 0.8-1.2 parts of processing aid: 0.8 to 2.0 portions. According to the invention, the polyolefin elastomer, the bimodal polyethylene, the flame retardant, the oxidant and the like are compounded to obtain the cable material which is low in hardness, good in flexibility, excellent in cracking resistance and flame retardance, excellent in processability and capable of meeting the requirements of different production extrusion processing devices.
Description
Technical Field
The invention relates to the technical field of polymer composite materials, in particular to a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material and a preparation method thereof.
Background
The existing low-smoke halogen-free flame-retardant cable material depends on the national standard of GB/T32129-2015 halogen-free low-smoke cable material for wires and cables. At present, the halogen-free low-smoke cable material is mainly prepared by taking EVA (ethylene-vinyl acetate copolymer) as a matrix resin material, assisting a polyolefin resin material and derivatives thereof, and adding a flame retardant. Through long-term technical development and formula improvement, a relatively perfect system and technical method are formed by relying on a low-smoke halogen-free flame-retardant cable material product of an EVA system. However, because the type of formula system mainly depends on the EVA material, and the EVA material is few in domestic manufacturers, only about 3 EVA materials can be produced at present, and with the increasing demand of optical film packaging materials and other industries, the demand and price fluctuation of the EVA material are further promoted, and domestic cable manufacturing enterprises need to develop a novel low-smoke halogen-free flame-retardant cable material product urgently, and the cable material product depending on polyolefin and its copolymer becomes a research hotspot.
At present, in low-smoke halogen-free flame-retardant cable material products prepared by polyolefin and copolymer materials thereof, some of the low-smoke halogen-free flame-retardant cable material products utilize metallocene polyethylene as a main carrier and are added with POE materials; and in some cases, the ethylene propylene diene monomer is added, oil is filled into the ethylene propylene diene monomer, and the ethylene propylene diene monomer is blended and banburied with related resin materials. However, when the polyethylene material is used as the matrix resin material, the hardness of the product is obviously higher (about 10 higher than that of the EVA system), and the risk of cracking of the cable in the later period is higher; the preparation process of the system added with the ethylene propylene diene monomer is complex, and the production process is not easy to rapidly and effectively develop. Therefore, a new method for preparing the cable material by taking the polyolefin and the copolymer material thereof as main raw materials is found, and the method has important significance for optimizing the functions, prolonging the service life and simplifying the production process.
Disclosure of Invention
In view of the above, the application provides a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material and a preparation method thereof, and the cable material with low hardness, excellent cracking resistance, flame retardance, flexibility and excellent comprehensive performance is obtained by compounding a polyolefin elastomer, bimodal polyethylene, a flame retardant, an oxidant and the like.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material 1 comprises the following components in parts by weight: polyolefin elastomer: 8-25 parts, polyolefin plastomer: 6-15 parts of bimodal polyethylene: 2-10 parts of polyethylene: 0-8 parts of a compatilizer: 3-6 parts of inorganic flame retardant: 50-70 parts of a synergistic flame retardant: 0 to 20 parts, P-N series flame retardant: 0-15 parts of antioxidant: 0.8-1.2 parts of processing aid: 0.8 to 2.0 portions.
Compared with the prior art, the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material provided by the application has the following advantages:
the cable material has the advantages that the polyolefin plastomer and the polyolefin elastomer are used as main resin matrixes, so that excellent flexibility is endowed to the cable material product, meanwhile, the added elastomer material optimizes the problem of compatibility of the flame retardant in the matrixes, and the basic mechanical property of the product is ensured; the cable material has the advantages that the bimodal polyethylene resin material and the polyethylene resin material are taken as auxiliary modified resin materials, so that the characteristics of the bimodal polyethylene material are fully utilized, the cable material product is endowed with good processing performance, and meanwhile, the cable material has excellent mechanical and physical properties; common inorganic powder flame-retardant systems are adopted, and P-N series flame retardants and synergistic flame retardants can be matched to obtain cable material products with different flame-retardant grades and meeting the flame-retardant standard GB/T32129-2015.
The cable material provided by the application has the advantages of lower hardness and bending radius, better flexibility and low-temperature resistance, no obvious difference with a low-smoke halogen-free flame-retardant material of an EVA system, obviously reduced process cost and contribution to industrial popularization and use.
The cable material provided by the application has good processing performance, has good adaptability to low-smoke halogen-free screws with different plasticizing capacities, special screws for PVC, separating screws and the like, and can meet the requirements of extrusion processing equipment for different productions.
Optionally, the polyolefin elastomer is an ethylene-octene copolymer, wherein the content of octene in the polyolefin elastomer is 30 wt% to 60 wt%.
Further optionally, the octene is 1-octene.
The preferable polyolefin elastomer is more beneficial to improving the compatibility of the flame retardant in a matrix, forming a uniform system and ensuring the basic mechanical property of the product.
Optionally, the polyolefin plastomer is an ethylene-octene copolymer or an ethylene-butene copolymer, wherein the content of octene or butene in the polyolefin plastomer is 10 wt% to 20 wt%.
Optionally, the shore hardness of the polyolefin elastomer is 55HA to 75 HA.
Optionally, the shore hardness of the polyolefin plastomer is 70HA to 85 HA.
Optionally, the antioxidant is at least one of a phenolic antioxidant, a phosphorus-containing antioxidant or a thioester antioxidant.
Further optionally, the antioxidant is antioxidant 1010.
Further optionally, the antioxidant is a mixture of an antioxidant 1010 and an antioxidant 168 in a mass ratio of 1: 0.4-1.
Further optionally, the antioxidant is a mixture of an antioxidant 1010, an antioxidant 168 and an antioxidant DLTP in a mass ratio of 5-8: 1-3.
The preferred antioxidant can obviously improve the aging resistance of the cable material.
Optionally, the bimodal polyethylene is FB 2230.
The bimodal polyethylene has two melting peak polyethylene materials, and the preferred bimodal polyethylene has wide melting temperature range, so that the processability and physical properties of the cable material are improved.
Optionally, the polyethylene has a melt index of 4-20. Wherein, the test conditions of the melt index are as follows: 90 ℃ 2.16kg 10 min.
For a screw structure with weak partial plasticizing capacity, the optimized melt index ensures that the polyethylene is completely melted under the banburying condition and is uniformly mixed with other matrix resin materials, thereby being beneficial to forming uniform condensed bodies and having good processing performance.
Optionally, the compatibilizer is a maleic anhydride grafted polyolefin material.
Further optionally, the compatibilizer is a maleic anhydride grafted POE material.
Optionally, the processing aid is at least one of silicone master batch, lubricant, silicone powder or silane coupling agent.
Further preferably, the silicone master batch has a silicone content of 50 wt%.
Further optionally, the silane coupling agent is a vinyl silane coupling agent.
Further optionally, the silane coupling agent is a171, a172 or a 151.
Optionally, the synergistic flame retardant is at least one of silica, an organosilicon flame retardant, montmorillonite, mica powder, a smoke suppressant or a char former.
The optimized synergistic flame retardant, the inorganic flame retardant and the P-N series flame retardant have excellent synergistic effect, can obviously improve the flame retardant effect of the cable material, and is nontoxic and environment-friendly.
Optionally, the P-N series flame retardant is a mixture of Melamine Cyanurate (MCA) and a phosphorus flame retardant in a mass ratio of 1: 2-6, wherein the phosphorus flame retardant is organic aluminum phosphinate, inorganic aluminum phosphinate or ammonium polyphosphate (APP).
The preferable P-N series flame retardants have excellent synergistic effect of the polycyanurate cyanurate and the phosphorus flame retardants, have small influence on the mechanical properties of the material, can obtain excellent flame retardant effect, and have no toxicity, less smoke and good carbon forming property.
Optionally, the inorganic flame retardant is aluminum hydroxide.
Optionally, the inorganic flame retardant is a mixture of aluminum hydroxide and magnesium hydroxide in a mass ratio of 3-5: 1.
Further optionally, the particle sizes D50 of the aluminum hydroxide and the magnesium hydroxide are both 1-2 μm.
Further, the application also provides a preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material, which comprises the following steps:
a, weighing the components according to the mixture ratio of the raw materials;
b, uniformly mixing all the components and then banburying to obtain a condensed body;
and step C, extruding and granulating the condensed body, hot cutting the die surface, cooling and screening to obtain the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material.
Compared with the prior art, the preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material provided by the application does not need steps such as oil filling, is reliable and controllable, is environment-friendly, and is beneficial to industrial popularization.
Optionally, in step B, the banburying conditions are as follows: the temperature is 155-165 ℃ and the time is 8-12 min.
The optimized mixing temperature is beneficial to forming a uniform mixed body after the components are melted, so that the cable material has more stable mechanical properties.
Optionally, in the step C, the temperature of the extrusion granulation is 110 to 165 ℃.
Further optionally, in step C, the internal mixer is extruded through a double-stage extruder or a single-screw extruder.
In the double-stage extruder, the temperature of the first-stage double-screw extruder is 110-160 ℃, and the temperature of the second-stage single-screw extruder is 110-130 ℃.
The temperature of the single screw extruder is 120-165 ℃.
The preferred extrusion temperature ensures the extrusion surface quality and the extrusion speed of the cable material; the preferred temperature is more adaptable to different screws.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific formulations of examples 1 to 8 provided herein are shown in table 1.
TABLE 1
Example 1
The embodiment provides a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material, which has a raw material formula shown in table 1, wherein:
the polyolefin elastomer is an ethylene-octene copolymer with a Shore hardness of 60HA, wherein the polyolefin elastomer contains 30-60 wt% of octene, and is purchased from Dow chemistry;
the polyolefin plastomer is an ethylene-octene copolymer with the Shore hardness of 70HA, wherein the content of octene in the polyolefin plastomer is 10-20 wt% and is purchased from Saebick company;
the bimodal polyethylene is FB 2230;
the polyethylene has a melt index of 14, wherein the test conditions of the melt index are as follows: 90 ℃ 2.16kg 10min, purchased from dow chemistry.
The preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material comprises the following steps:
a, weighing the components according to the mixture ratio of the raw materials;
b, uniformly mixing all the components, and then banburying for 10min at a banburying temperature of no more than 160 ℃ to obtain a banburying body;
step C, conveying the internal mixing body into a double-cone feeding device through a lifting machine, and extruding and producing granulation through an extruder, wherein the temperature of each area of the single-screw extruder is set to be 120 ℃, 130 ℃, 140 ℃, 150 ℃, 155 ℃, 140 ℃ and 130 ℃; and then the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material is obtained after hot cutting granulation on the die surface, air cooling molding and screening by a vibrating screen.
Example 2
The present embodiment provides a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material, which has a raw material formula shown in table 1, wherein
The polyolefin elastomer is an ethylene-octene copolymer with a Shore hardness of 60HA, wherein the polyolefin elastomer contains 30-60 wt% of octene, and is purchased from Dow chemistry;
the polyolefin plastomer is an ethylene-octene copolymer with the Shore hardness of 70HA, wherein the content of octene in the polyolefin plastomer is 10-20 wt% and is purchased from Saebick company;
the bimodal polyethylene is FB 2230;
the polyethylene has a melt index of 14, wherein the test conditions of the melt index are as follows: 90 ℃ 2.16kg 10min, purchased from Yanshan petrochemical.
The preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material is as described in example 1 and is not repeated.
Example 3
The present embodiment provides a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material, which has a raw material formula shown in table 1, wherein
The polyolefin elastomer is an ethylene-octene copolymer with the Shore hardness of 60HA, wherein the content of octene in the polyolefin elastomer is 30-60 wt%, and the polyolefin elastomer is available in the Dow chemical industry;
the polyolefin plastomer is an ethylene-octene copolymer with the Shore hardness of 70HA, wherein the content of octene in the polyolefin plastomer is 10-20 wt%, and the purchasing manufacturer is Saebick company;
the bimodal polyethylene is FB 2230;
the polyethylene has a melt index of 14, wherein the test conditions of the melt index are as follows: 90 ℃ 2.16kg 10min, purchased from Yanshan petrochemical.
The preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material is as described in example 1 and is not repeated.
Example 4
The present embodiment provides a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material, which has a raw material formula shown in table 1, wherein
The polyolefin elastomer is an ethylene-1-octene copolymer with the Shore hardness of 55HA, wherein the content of 1-octene in the polyolefin elastomer is 30-60 wt% and is purchased from the Dow chemical;
the polyolefin plastomer is an ethylene-butylene copolymer with the Shore hardness of 85HA, wherein the content of butylene in the polyolefin plastomer is 10-20 wt% and is purchased from Saebick company;
the bimodal polyethylene is FB 2230.
The preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material comprises the following steps:
a, weighing the components according to the mixture ratio of the raw materials;
b, uniformly mixing the components, and then banburying for 12min at a banburying temperature of not more than 155 ℃ to obtain a banburying body;
step C, conveying the internal mixer into a double-cone feeding device through a lifter, and extruding and producing granulation through an extruder, wherein the temperature of each area of the first-order double-screw extruder is set to be 110 ℃, 130 ℃, 140 ℃, 155 ℃ and 150 ℃, and the temperature of each area of the second-order single-screw extruder is set to be 120 ℃, 110 ℃ and 110 ℃; and then the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material is obtained after hot cutting granulation on the die surface, air cooling molding and screening by a vibrating screen.
Example 5
The present embodiment provides a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material, which has a raw material formula shown in table 1, wherein
The polyolefin elastomer is an ethylene-1-octene copolymer with the Shore hardness of 55HA, wherein the content of 1-octene in the polyolefin elastomer is 30-60 wt% and is purchased from the Dow chemical;
the polyolefin plastomer is an ethylene-butylene copolymer with the Shore hardness of 85HA, wherein the content of butylene in the polyolefin plastomer is 10-20 wt% and is purchased from Saebick company;
the bimodal polyethylene is FB 2230.
The preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material is as described in example 4, and is not repeated.
Example 6
The present embodiment provides a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material, which has a raw material formula shown in table 1, wherein
The polyolefin elastomer is an ethylene-octene copolymer with Shore hardness of 75HA, wherein the content of octene in the polyolefin elastomer is 30-60 wt% and is purchased from Dow chemistry;
the polyolefin plastomer is an ethylene-butylene copolymer with the Shore hardness of 70HA, wherein the content of butylene in the polyolefin plastomer is 10-20 wt% and is purchased from Saback company;
the bimodal polyethylene is FB 2230;
the polyethylene has a melt index of 18, wherein the test conditions of the melt index are as follows: 90 ℃ 2.16kg 10min, purchased from Exxon chemical.
The preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material comprises the following steps:
a, weighing the components according to the mixture ratio of the raw materials;
b, uniformly mixing the components, and then banburying for 8min, wherein the banburying temperature is controlled not to exceed 165 ℃ to obtain a banburying body;
step C, conveying the internal mixing body into a double-cone feeding device through a lifting machine, extruding and producing granulation through an extruder, wherein the temperature of each area of the single-screw extruder is set to be 120 ℃, 135 ℃, 145 ℃, 155 ℃, 165 ℃, 160 ℃ and 150 ℃; and then the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material is obtained after hot cutting granulation on the die surface, air cooling molding and screening by a vibrating screen.
Example 7
The present embodiment provides a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material, which has a raw material formula shown in table 1, wherein
The polyolefin elastomer is an ethylene-1-octene copolymer with the Shore hardness of 60HA, wherein the content of 1-octene in the polyolefin elastomer is 30-60 wt% and is purchased from the Dow chemical;
the polyolefin plastomer is an ethylene-octene copolymer with the Shore hardness of 70HA, wherein the content of octene in the polyolefin plastomer is 10-20 wt% and is purchased from Saebick company;
the bimodal polyethylene is FB 2230;
the polyethylene has a melt index of 4, wherein the test conditions of the melt index are as follows: 90 ℃ 2.16kg 10min, purchased from Exxon chemical.
The preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material comprises the following steps:
a, weighing the components according to the mixture ratio of the raw materials;
b, uniformly mixing all the components, and then banburying for 8min, wherein the banburying temperature is controlled not to exceed 160 ℃, so as to obtain a banburying body;
step C, conveying the internal mixing body into a double-cone feeding device through a lifter, and extruding and producing granulation through an extruder, wherein the temperature of each area of the single-screw extruder is set to be 130 ℃, 140 ℃, 150 ℃, 160 ℃, 165 ℃, 160 ℃ and 150 ℃; and then the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material is obtained after hot cutting granulation on the die surface, air cooling molding and screening by a vibrating screen.
Example 8
The present embodiment provides a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material, which has a raw material formula shown in table 1, wherein
The polyolefin elastomer is an ethylene-1-octene copolymer with the Shore hardness of 60HA, wherein the content of 1-octene in the polyolefin elastomer is 30-60 wt%, and the polyolefin elastomer is purchased from Exon chemical industry;
the polyolefin plastomer is an ethylene-octene copolymer with the Shore hardness of 70HA, wherein the content of octene in the polyolefin plastomer is 10-20 wt% and is purchased from Saebick company;
the bimodal polyethylene is FB 2230;
the polyethylene has a melt index of 8, wherein the test conditions of the melt index are as follows: 90 ℃ 2.16kg 10min, purchased from sapick.
The preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material comprises the following steps:
a, weighing the components according to the mixture ratio of the raw materials;
b, uniformly mixing the components, and then banburying for 10min, wherein the banburying temperature is controlled not to exceed 165 ℃ to obtain a banburying body;
step C, conveying the internal mixing body into a double-cone feeding device through a lifter, extruding and producing granulation through an extruder, wherein the temperature of each area of the first-order extruder is controlled at 120 ℃, 135 ℃, 145 ℃, 150 ℃ and 140 ℃, and the temperature of each area of the second-order extruder is controlled at 130 ℃, 120 ℃ and 110 ℃; and then the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material is obtained after hot cutting granulation on the die surface, air cooling molding and screening by a vibrating screen.
In order to better illustrate the characteristics of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material provided by the embodiment of the invention, the cable materials prepared in the embodiments 1 to 8 are subjected to performance detection, and the detection results are shown in the following table 2.
TABLE 2 test results
It can be seen from table 2 that the cable materials prepared in examples 1 to 8 all have excellent cracking resistance, flame retardancy and flexibility, low hardness and good comprehensive properties, meet the standards of the halogen-free low-smoke flame-retardant cable material for GB/T32129-2015 wires and cables, can be applied to wire and cable products with core temperature not higher than 90 ℃, and have no significant difference from the low-smoke halogen-free flame-retardant material of the EVA (ethylene-vinyl acetate copolymer) system.
As can be seen from table 2, the flame retardant systems of the cable materials prepared in the embodiments 1 to 3 are improved, although the cable material prepared in the embodiment 1 passes through a single vertical combustion test, the flame delay time is about 15s, the oxygen index of the embodiment 2 is slightly reduced, the single vertical combustion test achieves extinguishing after leaving fire, the char formation effect is good, and the carbon layer falls off less than that of the embodiment 1; the oxygen index of the cable material in the embodiment 3 is obviously improved, the crusting property of the cable material after combustion is obviously improved, the surface is covered with an obvious carbon layer, the self-extinguishing of the cable material from fire is also achieved in a single vertical combustion test, the smoke density is obviously reduced, but the elongation at break is reduced to some extent.
As can be seen from Table 2, the flame retardant property of the cable material is more excellent, the char forming property and the self-extinguishing property are better due to the compounding of the components in example 5, and the cable material can be suitable for places with higher requirements on the flame retardant property, such as finished cables of ZA and ZB grades which are burned in bundles.
As can be seen from table 2, in example 6, by controlling the compounding of the matrix resin material and the banburying temperature and the extrusion temperature during the preparation process, the hardness and the tensile strength of the cable material are significantly improved.
It can be seen from table 2 that the char formation of the cable materials prepared in examples 7 to 8 is improved significantly, the carbon layer shedding is significantly reduced, the self-extinguishing effect is more outstanding, and the transmittance of the finished cable is also greatly improved.
As long as the polyolefin elastomer, the polyolefin plastomer, the bimodal polyethylene, the P-N series flame retardant, the antioxidant or the processing aid are all in the preferable range, the prepared cable material can achieve the same or corresponding technical effects in the embodiments 1-8 of the invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A low-hardness low-smoke halogen-free flame-retardant polyolefin cable material is characterized in that: the composition comprises the following components in parts by weight: polyolefin elastomer: 8-25 parts, polyolefin plastomer: 6-15 parts of bimodal polyethylene: 2-10 parts of polyethylene: 0-8 parts of a compatilizer: 3-6 parts of inorganic flame retardant: 50-70 parts of a synergistic flame retardant: 0 to 20 parts, P-N series flame retardant: 0-15 parts of antioxidant: 0.8-1.2 parts of processing aid: 0.8 to 2.0 portions.
2. The low-hardness low-smoke halogen-free flame-retardant polyolefin cable material as claimed in claim 1, wherein: the polyolefin elastomer is an ethylene-octene copolymer, wherein the content of octene in the polyolefin elastomer is 30-60 wt%.
3. The low-hardness low-smoke halogen-free flame-retardant polyolefin cable material as claimed in claim 1, wherein: the polyolefin plastomer is an ethylene-octene copolymer or an ethylene-butene copolymer, wherein the content of octene or butene in the polyolefin plastomer is 10 wt% -20 wt%.
4. The low-hardness low-smoke halogen-free flame-retardant polyolefin cable material as claimed in claim 1, wherein: the Shore hardness of the polyolefin elastomer is 55 HA-75 HA; and/or
The Shore hardness of the polyolefin plastomer is 70 HA-85 HA.
5. The low-hardness low-smoke halogen-free flame-retardant polyolefin cable material as claimed in claim 1, wherein: the antioxidant is at least one of a phenol antioxidant, a phosphorus antioxidant or a thioester antioxidant.
6. The low-hardness low-smoke halogen-free flame-retardant polyolefin cable material as claimed in claim 5, wherein: the antioxidant is 1010; or
The antioxidant is a mixture of an antioxidant 1010 and an antioxidant 168 with a mass ratio of 1: 0.4-1; or
The antioxidant is a mixture of an antioxidant 1010, an antioxidant 168 and an antioxidant DLTP in a mass ratio of 5-8: 1-3.
7. The low-hardness low-smoke halogen-free flame-retardant polyolefin cable material as claimed in claim 1, wherein: the bimodal polyethylene is FB 2230; and/or
The melt index of the polyethylene is 4-20; and/or
The compatilizer is a maleic anhydride grafted polyolefin material; and/or
The processing aid is at least one of silicone master batch, lubricant, silicone powder or silane coupling agent; and/or
The synergistic flame retardant is at least one of silicon dioxide, an organic silicon flame retardant, montmorillonite, mica powder, a smoke suppressant or a char former; and/or
The P-N series flame retardant is a mixture of melamine cyanurate and a phosphorus flame retardant in a mass ratio of 1: 2-6, wherein the phosphorus flame retardant is organic aluminum phosphinate, inorganic aluminum phosphinate or ammonium polyphosphate.
8. The low-hardness low-smoke halogen-free flame-retardant polyolefin cable material as claimed in claim 1, wherein:
the inorganic flame retardant is aluminum hydroxide; or
The inorganic flame retardant is a mixture of aluminum hydroxide and magnesium hydroxide in a mass ratio of 3-5: 1.
9. A preparation method of a low-hardness low-smoke halogen-free flame-retardant polyolefin cable material is characterized by comprising the following steps: the method comprises the following steps:
a, weighing the components according to the raw material proportion of any one of claims 1 to 8;
b, uniformly mixing all the components and then banburying to obtain a condensed body;
and step C, extruding and granulating the condensed body, hot cutting the die surface, cooling and screening to obtain the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material.
10. The preparation method of the low-hardness low-smoke halogen-free flame-retardant polyolefin cable material as claimed in claim 9, characterized in that: in the step B, the banburying conditions are as follows: the temperature is 155-165 ℃ and the time is 8-12 min; and/or
In the step C, the temperature of the extrusion granulation is 110-165 ℃.
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| CN115746443A (en) * | 2022-11-25 | 2023-03-07 | 南京全信传输科技股份有限公司 | Low-temperature-resistant low-smoke halogen-free flame-retardant cable material and preparation method thereof |
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| CN102219948A (en) * | 2011-06-09 | 2011-10-19 | 湖北科普达实业有限公司 | Thermoplastic low-smoke zero-halogen inflaming-retarding polyolefin cable material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102219948A (en) * | 2011-06-09 | 2011-10-19 | 湖北科普达实业有限公司 | Thermoplastic low-smoke zero-halogen inflaming-retarding polyolefin cable material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115746443A (en) * | 2022-11-25 | 2023-03-07 | 南京全信传输科技股份有限公司 | Low-temperature-resistant low-smoke halogen-free flame-retardant cable material and preparation method thereof |
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