CN110922672A - Thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material and preparation method thereof - Google Patents
Thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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 discloses a thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material and a preparation method thereof. The cable material comprises raw materials of ethylene-vinyl acetate, polyethylene, maleic anhydride graft, a flame retardant, an antioxidant and a lubricant; can meet the electrical property requirement after the national standard 24 hours of water immersion.
Description
Technical Field
The invention relates to a high-electrical-property flame-retardant material, in particular to a thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material and a preparation method thereof.
Background
The traditional thermoplastic halogen-free low-smoke flame-retardant polyolefin material is mainly made of aluminium hydroxideFor a flame-retardant system, the electrical property requirement is more than or equal to 5.0 x 10 in reference standard JB/T10707-200711Omega, m, newly published national standard GB/T32129-2015, the electrical property is required to be more than or equal to 1.0 x 10 after 24H of soaking in water12Omega, m. The product with high electrical property requirement generally adopts magnesium as flame retardant, because of domestic magnesium, the heat productivity is large in a screw extruder, the fluidity is poor, the mass production is not suitable in the practical application, the imported magnesium is expensive, the manufacturing cost is greatly increased, and the product has no competitive advantage in the domestic market.
Therefore, the thermoplastic halogen-free low-smoke flame-retardant polyolefin material still having good electrical properties under the working condition with large heat generation is urgently needed to be provided in the field.
Disclosure of Invention
The invention aims to provide a thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material and a preparation method thereof, and the thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material still has good electrical property after being soaked in water for 24 hours.
In a first aspect of the present invention, a thermoplastic high electrical performance low smoke halogen-free flame retardant material is provided, which comprises the following components by weight:
in another preferred embodiment, each component of the material has one or more of the following characteristics in parts by weight:
40-60 parts of ethylene-vinyl acetate
12-20 parts of polyethylene
Maleic anhydride graft with 12-27 weight portions
120 portions and 150 portions of flame retardant
1-2.7 parts of lubricant
0.5 to 0.8 portion of antioxidant.
In another preferred embodiment, the components comprise the following components in parts by weight:
in another preferred example, the thermoplastic high-electrical property low-smoke halogen-free flame retardant material comprises the following components in parts by weight:
in a further preferred embodiment of the method,
the melt index of ethylene-vinyl acetate (EVA) is 4-7g/10min at 190 ℃ multiplied by 2.16 kg;
the polyethylene has a melt index of 3.0-4.0g/10min at 190 ℃ under 2.16 kg.
In another preferred embodiment, the maleic anhydride grafted graft is one or more of the following: maleic anhydride grafted polyethylene, maleic anhydride grafted ethylene-vinyl acetate, maleic anhydride grafted ethylene-octene copolymer; more preferably, the maleic anhydride grafting ratio is (0.80 ± 0.05)%;
the lubricant comprises polyethylene wax and silica gel master batch;
the antioxidant is one or more than two selected from N, N' -bis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl ] hydrazine (1024 for short), dilauryl thiodipropionate (DLTP for short), pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (1010 for short) and tris (2, 4-di-tert-butylphenyl) phosphite (168 for short).
In another preferred example, the flame retardant is hydromagnesite or comprises hydromagnesite and magnesium hydroxide; the hydromagnesite crystal form is a fibrous aggregate.
In another preferred embodiment, the crystal form fiber particle size D50 of the hydromagnesite is 8 +/-1 mu m, and the specific surface area BET 50 +/-5 m2/g。
In another preferred example, an electron microscope image of the hydromagnesite is shown in fig. 1.
In another preferred example, the thermoplastic high-electrical-property low-smoke halogen-free flame retardant material also has one or more than two of the following characteristics:
(1) the tensile strength of the material is at least 11MPa, preferably at least 12MPa, according to GB/T1040-2006;
(2) according to GB/T1040-2006, the material has an elongation at break of at least 180%, preferably at least 200%;
(3) according to GB/T5470-2008, the low-temperature impact embrittlement temperature of the material is-50 ℃;
(4) according to GB/T1410-13M, preferably at least 3.0 x 1013M, more preferably at least 4.0 x 1013Ω.m；
(4) According to GB/T1410-200, the material has a volume resistivity of at least 1.0 x 10 at 20 DEG C12M, preferably at least 2.0 x 1012M, more preferably at least 4.0 x 1012Ω.m；
(5) According to GB/T2406-1993, the oxygen index of the material is not lower than 30; preferably not less than 35.
In a second aspect of the present invention, there is provided a method for preparing the thermoplastic high electrical performance low smoke zero halogen flame retardant material provided by the present invention, which comprises the following process steps:
mixing ethylene-vinyl acetate, polyethylene, maleic anhydride graft, flame retardant, lubricant and antioxidant, and then extruding and granulating by a double-screw extruder to obtain the thermoplastic high-electrical-property low-smoke halogen-free flame retardant material.
In a third aspect of the invention, a thermoplastic high-electrical-property low-smoke halogen-free flame retardant material obtained by the preparation method provided by the invention is provided.
Therefore, the thermoplastic halogen-free low-smoke flame-retardant polyolefin material still has good electrical property under the working state with large heat productivity.
Drawings
Fig. 1 is an electron microscope image of hydromagnesite used in the examples of the present application.
Detailed Description
The inventor has made extensive and intensive studies, and the crystal form of the fibrous aggregate in the hydromagnesite is selected to effectively solve the problem caused by high water absorption of the flame retardant, so that under similar working currents, the production speed of an aluminum hydroxide flame-retardant system can be achieved, and the obtained material (cable material) can still keep good volume resistivity after being soaked in water. On the basis of this, the present invention has been completed.
As used herein, the term "comprising" or "includes" means that the various ingredients can be used together in a mixture or composition of the invention. Thus, the terms "consisting essentially of and" consisting of are encompassed by the terms "comprising" or "including".
Various aspects of the invention are described in detail below:
thermoplastic high-electrical-property low-smoke halogen-free flame-retardant insulating material
The flame-retardant system of the material can ensure that the material still has good electrical property after being soaked in water, and the volume resistivity of the material obtained by taking the aluminum hydroxide as the flame retardant generates a large amount of loss after being soaked in water.
The invention provides a thermoplastic high-electrical performance low-smoke halogen-free flame-retardant insulating material, which comprises the following components:
base resin
The base resin in the insulation material of the present invention is an ethylene-vinyl acetate copolymer (EVA), Polyethylene (PE), and maleic anhydride graft.
Typically, the ethylene vinyl acetate may be used in the insulation material of the present invention in an amount of 40 to 70 parts by weight, such as 45 to 65 parts by weight, 40 to 60 parts by weight, or 40 to 50 parts by weight, and the like.
The ethylene vinyl acetate suitable for use in the present invention may be ethylene vinyl acetate commonly used in the art for insulating materials. Typically, the ethylene vinyl acetate suitable for use in the present invention has a Vinyl Acetate (VA) monomer content of from 24 to 30 wt%. Herein, the content of a certain monomer in a polymer (rubber, elastomer, resin, etc.) means the mass fraction of such monomer to all monomers that synthesize the polymer. In certain embodiments, the ethylene vinyl acetate suitable for use in the present invention has a Vinyl Acetate (VA) monomer content of from 26 to 28 wt%.
The melt index of the ethylene-vinyl acetate copolymer is 4-7g/10min at 190 ℃ multiplied by 2.16 kg; preferably 5-6g/10 min.
The strength of the ethylene-vinyl acetate copolymer is more than 18 MPa.
The breaking elongation of the ethylene-vinyl acetate copolymer is more than 750 percent.
In certain embodiments, the ethylene vinyl acetate copolymer is a taiwan plastic 7470M.
In general, the polyethylene may be used in the insulation material of the present invention in an amount of 10 to 20 parts by weight, such as 12 to 18 parts by weight, 12 to 20 parts by weight, or 15 to 20 parts by weight, and the like.
The polyethylene suitable for use in the present invention may be polyethylene commonly used in the art for insulation materials. In general, the polyethylene suitable for use in the present invention has a melt index of from 3.0 to 4.0g/10min at 190 ℃ X2.16 kg. In certain embodiments, the polyethylene suitable for use in the present invention has a melt index of from 3.2 to 3.7g/10 min.
In certain embodiments, the polyethylene is exxon 3518 CB.
Typically, the maleic anhydride grafts are used in the insulation material of the invention in an amount of 10 to 30 parts by weight, such as 15 to 20 parts by weight, 12 to 27 parts by weight, or 15 to 25 parts by weight, etc.
The maleic anhydride grafts suitable for use in the present invention may be maleic anhydride grafted polyolefins wherein the maleic anhydride is grafted to the polyolefin, including, but not limited to, any one or combination of maleic anhydride grafted ethylene-octene copolymers (POE), maleic anhydride grafted ethylene-vinyl acetate (EVA), maleic anhydride grafted Polyethylene (PE). In certain embodiments, the present invention uses maleic anhydride grafted Ethylene Vinyl Acetate (EVA). In general, the maleic anhydride graft ratio suitable for the present invention is (0.8. + -. 0.05)%. Herein, the maleic anhydride grafting ratio refers to the mass fraction of maleic anhydride residues in the maleic anhydride-grafted polymer. In certain embodiments, the maleic anhydride graft suitable for use in the present invention is a combination of any one or more of maleic anhydride grafted ethylene-octene copolymer (POE), maleic anhydride grafted ethylene-vinyl acetate (EVA), maleic anhydride grafted Polyethylene (PE), with a maleic anhydride grafting ratio of (0.8 ± 0.05)%. For example, in certain embodiments, a compatibilizer suitable for use in the present invention is maleic anhydride grafted EVA with a maleic anhydride grafting ratio of (0.8. + -. 0.05)%.
Flame retardant system
Generally, the content of the flame retardant in the insulating material of the present invention is 160 parts by weight, such as 130-140 parts by weight, 120-150 parts by weight, 125-135 parts by weight, etc.
An essential ingredient suitable for use in the flame retardant system of the present invention is hydromagnesite, which in some embodiments may also contain magnesium hydroxide. Suitable weight ratios of hydromagnesite to magnesium hydroxide are 0.5-5: 1, such as 0.6-4: 1, 0.8-3.5: 1 or 1-3: 1, etc.
Hydromagnesite suitable for use in the invention is a crystalline form of a fibrous aggregate in hydromagnesite, wherein the particle size D50 is about 8 μm and the specific surface BET is about 50m2/g。
The decomposition temperature of hydromagnesite suitable for the invention is 370-380 ℃. The decomposition temperature is a thermal decomposition temperature, which is a temperature at which the external thermal energy is greater than the bond energy of the molecule, and thus the chain structure of the molecule is destroyed. Decomposition temperature was determined using TG detection.
Hydromagnesite suitable for use in the present invention has an MgO content of greater than 15% as determined according to ASTM D3663-84.
In certain embodiments, hydromagnesite suitable for use in the present invention has an electron micrograph as shown in fig. 1.
In certain embodiments, hydromagnesite suitable for use in the present invention is LH-3C from LKAB Minerals.
Lubricant agent
The amount of lubricant used depends on the efficiency of the production process used. Due to the difference of the screw rods of the device and the like, the adjustment can be carried out according to the actual situation. Typically, the total content of lubricant in the insulation material of the invention is 1-3 parts by weight, such as 1.2-2.8 parts by weight, 1.7-2.5 parts by weight or 1.1-1.5 parts by weight.
Lubricants suitable for use in the present invention include polyethylene wax and silicone rubber masterbatches. In certain embodiments, a lubricant suitable for use in the present invention is a combination of 0.3 to 2 parts by weight polyethylene wax and 1.2 to 2.5 parts by weight silicone rubber masterbatch.
The polyethylene wax suitable for the present invention has an average molecular weight of 2000-4000; the average molecular weight of the silicone rubber master batch is 500000-800000.
The silicone rubber master batch is prepared by compounding and processing silicone rubber and hydroxide, and can be prepared by mixing silicone rubber and an aluminum hydroxide internal mixer and carrying out twin-screw granulation. In certain embodiments, an aluminum hydroxide silica gel masterbatch is used.
In certain embodiments, polyethylene waxes suitable for use in the present invention are high-bridged CH-IIIB.
In certain embodiments, silicone rubber masterbatches suitable for use in the present invention are selected from donut.
Antioxidant agent
The antioxidant determines the aging performance of the material, the aging test period is long, and a large amount of test accumulation is needed for replacing the antioxidant. The compatibility between different antioxidants and the used resin is different, and besides the aging test, the compatibility difference brings performance difference and the problem of precipitation in a long time.
Generally, the antioxidant is present in the insulating material of the present invention in an amount of 0.5 to 1 part by weight, such as 0.6 to 0.9 part by weight, 0.5 to 0.8 part by weight, or 0.5 to 0.7 part by weight, and the like.
The antioxidant suitable for the present invention is one or a mixture of two or more of N, N' -bis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl ] hydrazine (1024 for short), dilauryl thiodipropionate (DLTP for short), pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (1010 for short) and tris (2, 4-di-tert-butylphenyl) phosphite (168 for short).
In certain embodiments, antioxidants suitable for use in the present invention are present in the range of (3-5): (1-3): (1-3): 1, mixture of 1024, DLTP, 1010 and 168.
In certain embodiments, antioxidants suitable for use in the present invention are present in the ratio by weight of (1-3): (1-3): 1 of 1010, 1024 and 168.
Preparation method
Generally, the insulating material of the present invention can be prepared by mixing an ethylene-vinyl acetate copolymer, polyethylene, a maleic anhydride graft, a flame retardant, an antioxidant, and a lubricant to obtain a master batch, and then extruding, granulating, and drying the master batch.
Mixing may be carried out by methods conventional in the art, for example, by using an internal mixer. In some embodiments, the ethylene-vinyl acetate copolymer, the polyethylene, the maleic anhydride graft, the flame retardant, the antioxidant and the lubricant in the required weight ratio are added into an internal mixer to be mixed for 1 to 30 minutes (5 to 15 minutes), and then the components are uniformly mixed to obtain the master batch.
The extrusion can be carried out by adopting a high compression ratio double-screw extruder for extrusion granulation, and the drying of the mixed master batch is strictly ensured, for example, the master batch is packaged by using a moistureproof aluminum-plastic composite bag after being dried. The granulation adopts a water-cooling brace granulation process, so that the cut particles have uniform size. After extrusion granulation, the product is dried, for example by forced air circulation at 90 ℃ for several hours, to obtain the insulating material.
The invention also includes the insulating material prepared by the method and the insulating material prepared by the components with corresponding contents.
Unless otherwise specified, the starting materials of the present invention are commercially available; or prepared according to conventional methods in the art. Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention.
Although numerical ranges and parameters setting forth the invention are approximate, the numerical values set forth in the specific examples are presented as precisely as possible. Any numerical value, however, inherently contains certain standard deviations found in their respective testing measurements. As used herein, "about" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a particular value or range. Alternatively, the term "about" means that the actual value falls within the acceptable standard error of the mean, as considered by those skilled in the art. Except in the experimental examples, or where otherwise expressly indicated, it is to be understood that all ranges, amounts, values and percentages herein used (e.g., to describe amounts of materials, length of time, temperature, operating conditions, quantitative ratios, and the like) are to be modified by the word "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained. At the very least, these numerical parameters are to be understood as meaning the number of significant digits recited and the number resulting from applying ordinary carry notation.
The features mentioned above with reference to the invention, or the features mentioned with reference to the embodiments, can be combined arbitrarily. All the features disclosed in this specification may be combined in any combination, and each feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose. Thus, unless expressly stated otherwise, the features disclosed are merely generic examples of equivalent or similar features.
The main advantages of the invention are:
1. the hydromagnesite adopted by the invention has better hydrophobicity and higher decomposition temperature, compared with the common aluminum hydroxide, decomposition air holes are less likely to be generated in the production process, and higher production efficiency can be achieved by a mode of increasing the temperature.
2. The invention uses ethylene-vinyl acetate copolymer and maleic anhydride grafted EVA to improve the compatibility between the basic resin and the flame retardant component, thereby improving the breaking strength and the elongation of the flame-retardant polyolefin material.
3. The invention improves the production efficiency, reduces the cost, greatly improves the electrical property of the provided insulating material, and meets the electrical property requirement of the national standard after 24 hours of water immersion.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer. Unless otherwise indicated, all parts are parts by weight, all percentages are percentages by weight, and the molecular weight of the polymer is the number average molecular weight.
Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention.
The information on the source of the raw materials used in the following examples is as follows:
7470M is an ethylene-vinyl acetate copolymer available from Taiwan plastics
3518CB is polyethylene, available from Exxon
Hydromagnesite LH-3C (crystalline form is fibrous aggregate) from LKAB Minerals
Dandongxin Yang HF-III is magnesium hydroxide, available from Dandongxin Yangye
The composite antioxidant is a mixture of 1010, 1024 and 168, and the dosage is 0.2Kg, 0.2Kg and 0.1Kg respectively
The polyethylene wax is high-bridge CH-IIIB, purchased from Shanghai high-bridge petrochemical
The silicone rubber master batch is prepared by mixing silicone rubber and an aluminum hydroxide internal mixer and granulating by a double screw.
Example 1
The components and the weight (Kg) of the thermoplastic high-electrical-property low-smoke halogen-free flame retardant material are as follows:
the preparation method of the thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material comprises the following steps:
weighing various raw materials according to a formula, pouring the raw materials into a high-speed stirrer, stirring the raw materials for about 10 minutes to uniformly mix the raw materials, immediately mixing the raw materials by using an internal mixer for uniform granulation after discharging, extruding granules by using a high-compression ratio screw double-screw extruder for granulation, strictly ensuring that the mixed materials are dried, and adopting a water-cooling strip cutting process for granulation so as to ensure that the sizes of cut particles are uniform.
Example 2
Selecting the components and the components, wherein the unit Kg of the components is as follows:
the preparation method of the thermoplastic halogen-free flame retardant material is the same as that of example 1.
Example 3
Selecting the components and the components, wherein the unit Kg of the components is as follows:
the preparation method of the thermoplastic halogen-free flame retardant material is the same as that of example 1.
Example 4
Selecting the components and the components, wherein the unit Kg of the components is as follows:
the preparation method of the thermoplastic halogen-free flame retardant material is the same as that of example 1.
Test method
According to the relevant national technical standards, the test results are as follows:
comparative examples 1 to 4
With the scheme of the above embodiment 1, only the flame retardants therein are replaced with:
comparative example 1: magnesium hydroxide HF-III
Comparative example 2: hydromagnesite LH-3C and magnesium hydroxide HF-III (dosage ratio shown in the following table) with flaky crystal forms
Comparative example 3: hydromagnesite LH-3C and magnesium hydroxide HF-III (dosage ratio shown in the following table) with fibrous crystal forms
Comparative example 4: hydromagnesite LH-3C with fibrous crystal form
The results of the tests according to the methods of the above examples, according to the national relevant technical standards, are as follows:
the result shows that the hydromagnesite with the crystal form being a fibrous aggregate in the flame retardant can effectively solve the problem caused by large water absorption of the flame retardant, so that the obtained material (cable material) can still keep good volume resistivity after being soaked in water.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the scope of the invention, which is defined by the claims appended hereto, and any other technical entity or method that is encompassed by the claims as broadly defined herein, or equivalent variations thereof, is contemplated as being encompassed by the claims.
Claims (10)
1. A thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material comprises the following components in parts by weight:
2. the thermoplastic high-electrical property low-smoke halogen-free flame-retardant material as claimed in claim 1, wherein the components thereof comprise, in parts by weight:
3. the thermoplastic high-electrical performance low-smoke halogen-free flame retardant material as claimed in claim 1, wherein the components comprise the following components in parts by weight:
4. the thermoplastic high-electrical performance low-smoke halogen-free flame retardant material according to claim 1, wherein the maleic anhydride grafted graft is one or more than two of the following: maleic anhydride grafted polyethylene, maleic anhydride grafted ethylene-vinyl acetate, maleic anhydride grafted ethylene-octene copolymer; preferably, the grafting rate of the maleic anhydride is (0.80 +/-0.05)%;
the lubricant comprises polyethylene wax and silica gel master batch;
the antioxidant is one or more than two selected from N, N' -bis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl ] hydrazine (1024 for short), dilauryl thiodipropionate (DLTP for short), pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (1010 for short) and tris (2, 4-di-tert-butylphenyl) phosphite (168 for short).
5. The thermoplastic high-electrical performance low-smoke halogen-free flame retardant material as claimed in claim 1, wherein the flame retardant is hydromagnesite or comprises hydromagnesite and magnesium hydroxide; the hydromagnesite crystal form is a fibrous aggregate.
6. The thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material as claimed in claim 5, wherein the crystal fiber particle size D50 of hydromagnesite is 8 +/-1 μm, and the specific surface area BET 50 +/-5 m2/g。
7. The thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material as claimed in claim 5, wherein an electron micrograph of hydromagnesite is shown in figure 1.
8. The thermoplastic high electrical performance low smoke zero halogen flame retardant material according to any of claims 1 to 7, wherein the material further has one or more of the following characteristics:
(1) the tensile strength of the material is at least 11MPa, preferably at least 12MPa, according to GB/T1040-2006;
(2) according to GB/T1040-2006, the material has an elongation at break of at least 180%, preferably at least 200%;
(3) according to GB/T5470-2008, the low-temperature impact embrittlement temperature of the material is-50 ℃;
(4) according to GB/T1410-13M, preferably at least 3.0 x 1013M, more preferably at least 4.0 x 1013Ω.m；
(4) According to GB/T1410-200, the material has a volume resistivity of at least 1.0 x 10 at 20 DEG C12M, preferably at least 2.0 x 1012M, more preferably at least 4.0 x 1012Ω.m；
(5) According to GB/T2406-1993, the oxygen index of the material is not lower than 30; preferably not less than 35.
9. A method for preparing a thermoplastic high electrical performance low smoke zero halogen flame retardant material according to any one of claims 1 to 8, comprising the following process steps:
mixing ethylene-vinyl acetate, polyethylene, maleic anhydride graft, flame retardant, lubricant and antioxidant, and then extruding and granulating by a double-screw extruder to obtain the thermoplastic high-electrical-property low-smoke halogen-free flame retardant material.
10. A thermoplastic high-electrical-property low-smoke halogen-free flame-retardant material obtained by the preparation method of claim 9.
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Citations (2)
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| CN106496759A (en) * | 2016-11-09 | 2017-03-15 | 北京理工大学 | A kind of low smoke and zero halogen nano fire-retarding composite material for the ethylene vinyl acetate copolymer for promoting into charcoal and preparation method thereof |
| CN108239331A (en) * | 2016-12-27 | 2018-07-03 | 上海凯波特种电缆料厂有限公司 | A kind of thermoplastic halogen-free flame retarding material and preparation method thereof |
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| CN106496759A (en) * | 2016-11-09 | 2017-03-15 | 北京理工大学 | A kind of low smoke and zero halogen nano fire-retarding composite material for the ethylene vinyl acetate copolymer for promoting into charcoal and preparation method thereof |
| CN108239331A (en) * | 2016-12-27 | 2018-07-03 | 上海凯波特种电缆料厂有限公司 | A kind of thermoplastic halogen-free flame retarding material and preparation method thereof |
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