CN110922659A - Infrared-transmitting flame-retardant polyethylene EVA (ethylene-vinyl acetate) alloy modified material and preparation method thereof - Google Patents
Infrared-transmitting flame-retardant polyethylene EVA (ethylene-vinyl acetate) alloy modified material and preparation method thereof Download PDFInfo
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- CN110922659A CN110922659A CN201911094786.7A CN201911094786A CN110922659A CN 110922659 A CN110922659 A CN 110922659A CN 201911094786 A CN201911094786 A CN 201911094786A CN 110922659 A CN110922659 A CN 110922659A
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- infrared
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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
- C08L23/06—Polyethene
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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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
- C08K2003/3036—Sulfides of zinc
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Abstract
The invention provides an infrared-transmitting flame-retardant polyethylene EVA (ethylene-vinyl acetate copolymer) alloy modified material, which comprises the following raw material formula in percentage by mass: polyethylene: 48-73.4%, ethylene-vinyl acetate copolymer (EVA): 20-30%, brominated flame retardant: 4-9.5%, flame retardant synergist: 1.5-5%, infrared-transmitting modifier: 1-5%, other processing aids: 0.1 to 2.5 percent. The infrared-transmitting flame-retardant polyethylene EVA alloy modified material is toughened by adding EVA, the impact strength of the material is obviously improved compared with that of polyethylene resin, and the flame retardant performance and the infrared-transmitting performance of the material are not influenced.
Description
Technical Field
The invention belongs to the field of modified plastics, and particularly relates to an infrared-transmitting flame-retardant polyethylene EVA alloy modified material and a preparation method thereof.
Background
With the increasing domestic consumption level, more and more household appliances have an intelligent control function, wherein the realization of automatic control through infrared induction is one of important directions, and an infrared ray transmission material can allow infrared rays in a certain specific wavelength range (5-15 μm) to pass through without absorption and reflection. As a key material in the infrared transmission technology, due to the contact with electronic components, relevant national regulations require flame retardance, and therefore the requirements of infrared transmission and flame retardance need to be met simultaneously.
Polyethylene, as a thermoplastic plastic with the largest global dosage, has good toughness, electrical insulation and easy processability, the HDPE material can be widely applied to the fields of electronic appliances, food packaging, pipes, agriculture and the like, the extrusion-grade or blow-molding high-density polyethylene HDPE has poor flowability due to large molecular weight and is difficult to be formed by injection molding, the injection-molding HDPE is easy to realize injection molding although the flowability is good, but the use condition of the HDPE material is limited due to low impact strength, under specific use conditions, a toughening agent is required to be added for toughening, although polyethylene has certain infrared transmission characteristic, the traditional POE toughening agent has stronger absorption effect on infrared rays, in addition, the common flame-retardant polyethylene products on the market at present generally adopt magnesium hydroxide, aluminum hydroxide or intumescent flame retardants, the flame retardant has a strong infrared absorption effect, so that the finally prepared flame-retardant polyethylene material does not have an infrared transmission characteristic.
Disclosure of Invention
In view of the above, the invention aims to provide an infrared-transmitting flame-retardant polyethylene EVA alloy modified material and a preparation method thereof, which are used for overcoming the defect that the existing polyethylene product cannot give consideration to infrared transmission, toughness and flame retardant property.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an infrared-transmitting flame-retardant polyethylene EVA alloy modified material comprises the following raw material formula in percentage by mass:
polyethylene: 48 to 73.4 percent
Ethylene-vinyl acetate copolymer (EVA): 20 to 30 percent
Brominated flame retardants: 4 to 9.5 percent
Flame retardant synergist: 1.5 to 5 percent
Infrared-transmitting modifier: 1 to 5 percent
Other processing aids: 0.1 to 2.5 percent.
Further, the polyethylene is high-density polyethylene, and the melt flow rate of the polyethylene is 2-30g/10min under the test conditions of 190 ℃ and 2.16 kg.
Further, the content of the ethylene-vinyl acetate copolymer (EVA) and the Vinyl Acetate (VA) is 7%.
Further, the ethylene-vinyl acetate copolymer (EVA) has a melt flow rate of 0.5 to 3g/min at 190 ℃ under a test condition of 2.16 kg.
Further, the brominated flame retardant is one or more of flame retardants such as octabromoether and octabromothioether.
Further, the flame-retardant synergist is one or more of flame retardants such as antimony trioxide, antimony pentoxide, zinc borate and the like.
Further, the infrared-transmitting modifier is one or more of KBr, zinc sulfide, magnesium fluoride, zinc selenide and the like.
Further, the processing aid is one or more of an antioxidant, a coupling agent, a nucleating agent, an anti-sticking agent and a lubricant.
Further, the brominated flame retardant is octabromoether, the flame-retardant synergist is antimony trioxide, and the infrared-transmitting modifier is zinc sulfide.
A preparation method of an infrared-transmitting flame-retardant polyethylene EVA alloy modified material comprises the following steps:
1) uniformly mixing the raw material components of the infrared-transmitting flame-retardant polyethylene EVA alloy modified material of any one of claims 1-8 according to a formula ratio to obtain a uniformly mixed mixture A;
2) feeding the mixture A obtained in the step 1) from a main feeding port of an extruder, and melting and extruding the mixture A by the extruder to obtain a strip-shaped mixture B;
the machine barrel of the double-screw extruder is divided into 9 temperature intervals from a feeding hole to a discharging hole, and the processing conditions of melt extrusion are as follows: the temperature of the first zone is 180-;
the extruder is a double-screw extruder;
the screw rotating speed of the double-screw extruder is 250-360 revolutions per minute;
3) granulating the mixture B obtained in the step 2) to obtain the infrared-transmitting flame-retardant polyethylene EVA alloy modified material.
Further, the infrared-transmitting flame-retardant polyethylene EVA alloy modified material can be applied to the fields of household appliances and automobile industry.
Compared with the prior art, the infrared-transmitting flame-retardant polyethylene EVA alloy modified material and the preparation method thereof have the following advantages:
(1) the infrared-transmitting flame-retardant polyethylene EVA alloy modified material disclosed by the invention is endowed with flame-retardant performance by selecting a proper flame-retardant system, and the flame-retardant grade can reach UL 94V-2 grade.
(2) According to the infrared-transmitting flame-retardant polyethylene EVA alloy modified material, by adding a proper infrared-transmitting auxiliary agent, the modified material has small infrared absorption and reflection effects and has an infrared-transmitting characteristic for infrared rays of 5-15 microns.
(3) The infrared-transmitting flame-retardant polyethylene EVA alloy modified material is toughened by adding EVA, so that the impact strength is remarkably improved compared with that of polyethylene resin, and the flame retardant property and the infrared-transmitting property of the material are not influenced.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Examples 1 to 4
The raw material formula of the infrared-transmitting flame-retardant polyethylene EVA alloy modified material is shown in Table 1, and the preparation method comprises the following steps:
uniformly mixing the raw materials, and then feeding the raw materials from a main feeding port of an extruder;
melting and extruding the raw materials in a double-screw extruder, and granulating to obtain the infrared-transmitting flame-retardant polyethylene EVA alloy modified material;
the machine barrel of the double-screw extruder is divided into 9 temperature intervals from a feeding hole to a discharging hole, and the processing conditions of melt extrusion are as follows: the temperature of a first area is 190 ℃, the temperature of a second area is 190 ℃, the temperature of a third area is 200 ℃, the temperature of a fourth area is 200 ℃, the temperature of a fifth area is 210 ℃, the temperature of a sixth area is 210 ℃, the temperature of a seventh area is 210 ℃, the temperature of an eighth area is 210 ℃, and the temperature of a ninth area is 190 ℃;
the screw speed of the twin-screw extruder was 300 revolutions per minute.
Comparative example
The flame-retardant polyethylene material is shown in table 1, and the preparation method comprises the following steps:
uniformly mixing the raw materials, and then feeding the raw materials from a main feeding port of a double-screw extruder;
melting and extruding the raw materials in a double-screw extruder, granulating and drying to obtain the flame-retardant polyethylene material;
the raw materials are all the prior art.
Test example
The pellets obtained in the examples and comparative examples were injection molded into corresponding test specimens and tested, the test results are shown in Table 2.
Table 1 table of raw material formulations (in mass percent) of flame retardant polyethylenes of examples and comparative examples
TABLE 2 test data tabulations for examples and comparative examples
From the test results of examples 1 to 4 and comparative examples, it can be seen that the addition of EVA can significantly enhance the impact strength of the finished material under impact load while ensuring the infrared transmittance and flame retardancy of the product, so that the material has more excellent impact energy absorption and crack propagation resistance, and more balanced mechanical properties.
From the test results of examples 1 to 4, it can be seen that the maximum value of the toughness of the material in the test is 18kJ/m2 in example 4, and the mass percentage of EVA and HDPE in the raw material composition of the example is smaller than that in example 3, but not the maximum value, and the two are not in direct proportion.
As can be seen from the test results of examples 1 to 4 and comparative example, the infrared transmittance test results are one, the materials obtained in examples 2 and 4 are better than those obtained in examples 1 and 3, the materials obtained in examples 1 and 3 are better than those obtained in comparative example, and the infrared transmittance can be effectively improved by adding the infrared transmittance modifier;
in example 2, the amount of zinc sulfide added was less than that in example 3, but the material obtained in example 2 had better infrared transmittance than that of the material obtained in example 3, and the infrared transmittance was not in direct proportion to the amount of infrared-transmitting modifier added, and was affected by the brominated flame retardant and the flame-retardant synergist.
From the test results of examples 1 to 4, it is understood that the flame retardancy of the materials obtained in examples 1 and 3 is the best, and the flame retardancy of the materials obtained in examples 2 and 4 is reduced by excessively reducing the addition amount of the brominated flame retardant and the flame retardant synergist.
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The infrared-transmitting flame-retardant polyethylene EVA alloy modified material is characterized in that: the formula comprises the following raw materials in percentage by mass:
polyethylene: 48 to 73.4 percent
Ethylene-vinyl acetate copolymer (EVA): 20 to 30 percent
Brominated flame retardants: 4 to 9.5 percent
Flame retardant synergist: 1.5 to 5 percent
Infrared-transmitting modifier: 1 to 5 percent
Other processing aids: 0.1 to 2.5 percent.
2. The infrared-transmitting flame-retardant polyethylene EVA alloy modified material of claim 1, wherein: the polyethylene is high-density polyethylene, and the melt flow rate of the polyethylene is 2-30g/10min at 190 ℃ under the test condition of 2.16 kg.
3. The infrared-transmitting flame-retardant polyethylene EVA alloy modified material of claim 1, wherein: the content of the ethylene-vinyl acetate copolymer (EVA) is 7 percent.
4. The infrared-transmitting flame-retardant polyethylene EVA alloy modified material of claim 1, wherein: the melt flow rate of the ethylene-vinyl acetate copolymer (EVA) is 0.5-3g/min at 190 ℃ under the test condition of 2.16 kg.
5. The infrared-transmitting flame-retardant polyethylene EVA alloy modified material of claim 1, wherein: the bromine flame retardant is one or more of eight bromine ether, eight bromine thioether and the like.
6. The infrared-transmitting flame-retardant polyethylene EVA alloy modified material of claim 1, wherein: the flame-retardant synergist is one or more of flame retardants such as antimony trioxide, antimony pentoxide, zinc borate and the like.
7. The infrared-transmitting flame-retardant polyethylene EVA alloy modified material of claim 1, wherein: the infrared-transmitting modifier is one or more of KBr, zinc sulfide, magnesium fluoride, zinc selenide and the like.
8. The infrared-transmitting flame-retardant polyethylene EVA alloy modified material of claim 1, wherein: the processing aid is one or more of an antioxidant, a coupling agent, a nucleating agent, an anti-sticking agent and a lubricant.
9. The infrared-transmitting flame-retardant polyethylene EVA alloy modified material of claim 1, wherein: the brominated flame retardant is octabromoether, the flame-retardant synergist is antimony trioxide, and the infrared-transmitting modifier is zinc sulfide.
10. A preparation method of the infrared-transmitting flame-retardant polyethylene EVA alloy modified material of any one of claims 1 to 8 is characterized by comprising the following steps:
1) uniformly mixing the raw material components of the infrared-transmitting flame-retardant polyethylene EVA alloy modified material of any one of claims 1-8 according to a formula ratio to obtain a uniformly mixed mixture A;
2) feeding the mixture A obtained in the step 1) from a main feeding port of an extruder, and melting and extruding the mixture A by the extruder to obtain a strip-shaped mixture B;
the melting temperature is 180-240 ℃;
the extruder is a double-screw extruder;
the screw rotating speed of the double-screw extruder is 250-360 revolutions per minute;
3) granulating the mixture B obtained in the step 2) to obtain the infrared-transmitting flame-retardant polyethylene EVA alloy modified material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911094786.7A CN110922659A (en) | 2019-11-11 | 2019-11-11 | Infrared-transmitting flame-retardant polyethylene EVA (ethylene-vinyl acetate) alloy modified material and preparation method thereof |
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| CN201911094786.7A CN110922659A (en) | 2019-11-11 | 2019-11-11 | Infrared-transmitting flame-retardant polyethylene EVA (ethylene-vinyl acetate) alloy modified material and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112898669A (en) * | 2020-12-25 | 2021-06-04 | 青岛中新华美塑料有限公司 | Infrared light permeable black plastic and preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03290452A (en) * | 1990-04-06 | 1991-12-20 | Idemitsu Petrochem Co Ltd | Polyethylene resin composition |
| CN103627066A (en) * | 2013-11-27 | 2014-03-12 | 安徽科聚新材料有限公司 | Far infrared ray transmitting composite material and preparation method thereof |
| CN105670265A (en) * | 2016-04-14 | 2016-06-15 | 上海中镭新材料科技有限公司 | Infrared transmittance material, preparation method and application |
| CN109929168A (en) * | 2017-12-15 | 2019-06-25 | 中蓝晨光化工研究设计院有限公司 | Modified polyethylene material and preparation method thereof suitable for electric insulator |
-
2019
- 2019-11-11 CN CN201911094786.7A patent/CN110922659A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03290452A (en) * | 1990-04-06 | 1991-12-20 | Idemitsu Petrochem Co Ltd | Polyethylene resin composition |
| CN103627066A (en) * | 2013-11-27 | 2014-03-12 | 安徽科聚新材料有限公司 | Far infrared ray transmitting composite material and preparation method thereof |
| CN105670265A (en) * | 2016-04-14 | 2016-06-15 | 上海中镭新材料科技有限公司 | Infrared transmittance material, preparation method and application |
| CN109929168A (en) * | 2017-12-15 | 2019-06-25 | 中蓝晨光化工研究设计院有限公司 | Modified polyethylene material and preparation method thereof suitable for electric insulator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112898669A (en) * | 2020-12-25 | 2021-06-04 | 青岛中新华美塑料有限公司 | Infrared light permeable black plastic and preparation method and application thereof |
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Application publication date: 20200327 |