CN112795147B - high-GWIT flame-retardant PBT composition and preparation method and application thereof - Google Patents
high-GWIT flame-retardant PBT composition and preparation method and application thereof Download PDFInfo
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- CN112795147B CN112795147B CN202011585123.8A CN202011585123A CN112795147B CN 112795147 B CN112795147 B CN 112795147B CN 202011585123 A CN202011585123 A CN 202011585123A CN 112795147 B CN112795147 B CN 112795147B
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- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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Abstract
The invention discloses a high GWIT flame-retardant PBT composition, and a preparation method and application thereof. The high GWIT flame-retardant PBT composition comprises the following components in parts by weight: 55-80 parts of PBT resin; 8 to 10 parts of brominated flame retardant; 0.5 to 1 part of antimony trioxide; 3 to 6 parts of calcium hydroxide; 20 to 35 parts of alkali-free glass fiber. According to the invention, through specific component compatibility, especially the synergistic compatibility of antimony trioxide and calcium hydroxide, the GWIT of the brominated flame-retardant PBT can be effectively improved to reach 850 ℃, 1.60mmV 0-grade flame retardance is realized, the high-GWIT flame-retardant PBT composition also has good mechanical properties, the tensile strength can reach 110MPa, the notch impact strength can reach 9.5kJ/m2, and the bending strength can reach 165MPa, so that the requirements of electronic and electric products on flame-retardant materials can be completely met, and the composition is especially suitable for unattended electronic and electric products.
Description
Technical Field
The invention relates to the technical field of engineering plastics, and particularly relates to a high GWIT flame-retardant PBT composition, and a preparation method and application thereof.
Background
The flame-retardant reinforced PBT material is widely applied in the fields of electronic appliances and the like, for a long time, a bromine-antimony compound system is usually adopted for flame-retardant PBT, and the flame-retardant reinforced PBT material has the advantages of high flame-retardant efficiency and good flame-retardant effect, but the conventional flame-retardant PBT engineering plastic can only meet the V-0 flame-retardant requirement of UL-94, the Glow Wire Ignition Temperature (GWIT) of the IEC glow wire test is lower and is usually only about 725 ℃, a plurality of unattended electric appliance products put higher requirements on the GWIT, the GWIT is required to reach 850 ℃, and the conventional flame-retardant PBT can not meet the requirements.
The prior art CN101851405A discloses an environment-friendly flame-retardant reinforced PBT (polybutylene terephthalate) engineering plastic with high CTI (comparative tracking index) and high GWIT (glow wire ignition temperature) for unattended electric appliances and a preparation method thereof, wherein the PBT engineering plastic consists of PBT resin, a compound flame retardant, a toughening agent and a char forming agent, and the compound flame retardant consists of three flame retardants of different types: the flame retardant is characterized by consisting of a brominated flame retardant system A component, a nitrogen flame retardant B component and a phosphorus flame retardant system C component, wherein red phosphorus and MCA are adopted as flame retardants for improving GWIT, but the GWIT of the PBT material prepared by the scheme can only reach 750 ℃, and cannot meet the market requirement that the GWIT reaches 850 ℃.
Disclosure of Invention
The invention aims to overcome the defect and the defect that the GWIT of the conventional flame-retardant PBT composition cannot reach 850 ℃, and provides a high-GWIT flame-retardant PBT composition, which can realize GWIT850 ℃ and 1.6mmV 0-level flame retardance through the synergistic effect of antimony trioxide and calcium hydroxide and has good mechanical properties.
The invention also aims to provide a preparation method of the high GWIT flame-retardant PBT composition.
The invention further aims to provide application of the high GWIT flame-retardant PBT composition in preparation of electronic appliances.
The above purpose of the invention is realized by the following technical scheme:
the high GWIT flame-retardant PBT composition comprises the following components in parts by weight:
45-61 parts of PBT resin
8 to 10 portions of brominated flame retardant
0.5 to 1 part of antimony trioxide
3 to 6 portions of calcium hydroxide
20 to 35 parts of alkali-free glass fiber.
The high GWIT flame-retardant PBT composition comprises PBT resin, a brominated flame retardant, antimony trioxide, calcium hydroxide and alkali-free glass fiber components, wherein:
the PBT resin is the resin matrix of the high GWIT flame retardant PBT composition.
The addition of the brominated flame retardant can realize V0 flame retardance, the performance is influenced when the content is too high, and the flame retardant effect is poor when the content is too low, so that the content is further controlled to be 8-10 parts.
The high GWIT flame-retardant PBT composition contains antimony trioxide and calcium hydroxide, the antimony trioxide and the calcium hydroxide synergistically have a good GWIT improving effect, and the GWIT of the flame-retardant PBT composition is improved to 850 ℃ mainly through a gas-phase flame-retardant mechanism effect.
Moreover, the content of the components of antimony trioxide and calcium hydroxide in the high GWIT flame-retardant PBT composition is also crucial, and when the content of antimony trioxide is too low, the flame retardance of UL-94V0 is not achieved; when the antimony trioxide content is too high, the GWIT temperature is greatly reduced. Similarly, when the content of calcium hydroxide is too low, the GWIT temperature does not reach the requirement of 850 ℃, but when the content of calcium hydroxide is too high, the mechanical property is obviously reduced. Therefore, the mechanical property, the flame retardant property and the synergistic balance of GWIT of the high GWIT flame retardant PBT composition need to be comprehensively considered, and the comprehensive optimization of the mechanical property, the flame retardant property and the GWIT is realized.
The alkali-free glass fiber mainly provides high mechanical strength in the high GWIT flame-retardant PBT composition, but the influence of the addition amount on the fluidity is considered, so that the mechanical strength and the fluidity are comprehensively considered, and the content is selected to be 25-35 parts.
Preferably, the composition comprises the following components in parts by weight:
45-54 parts of PBT resin
8 parts of brominated flame retardant
0.5 part of antimony trioxide
4 to 6 portions of calcium hydroxide
30 to 35 parts of alkali-free glass fiber.
In order to further improve the mechanical properties of the flame retardant PBT composition, the flame retardant PBT composition of the invention preferably comprises the following components in parts by weight:
45-51 parts of PBT resin
8 parts of brominated flame retardant
0.5 part of antimony trioxide
4 to 6 portions of calcium hydroxide
35 parts of alkali-free glass fiber.
Further preferably, the composition comprises the following components in parts by weight:
50.5 parts of PBT resin
8 parts of brominated flame retardant
0.5 part of antimony trioxide
4 parts of calcium hydroxide
35 parts of alkali-free glass fiber.
Wherein, preferably, the PBT resin has a relative density of 1.30-1.32g/cm3Melting point 215-.
Preferably, the brominated flame retardant is brominated epoxy resin or brominated polystyrene. The problems of precipitation or poor compatibility and the like of other brominated flame retardants in PBT are easy to occur, and the brominated flame retardants selected by the invention, especially brominated epoxy resin and brominated polystyrene, can effectively avoid the problems of precipitation or poor compatibility.
Preferably, the calcium hydroxide is calcium hydroxide with the particle size of 1-10 mu m. Too large particle size affects the glow wire GWIT performance, and too small particle size is not easy to process.
The invention also provides a preparation method of the high GWIT flame-retardant PBT composition, which comprises the following steps:
uniformly mixing PBT resin, a brominated flame retardant, antimony trioxide and calcium hydroxide in a high-speed mixer, adding the mixture into a double-screw extruder, feeding alkali-free glass fiber from the side of the extruder, plasticizing, mixing, extruding, cooling and granulating to obtain the high-GWIT flame-retardant PBT composition.
Wherein, the PBT resin is subjected to water removal treatment before other components are mixed, and the water removal operation is as follows: and drying the PBT for 3-5 hours at the temperature of 130-140 ℃.
The application of the high GWIT flame-retardant PBT composition in the preparation of electronic appliances is also within the protection scope of the invention.
The flame-retardant material for the electronic and electric appliances has certain performance requirements on the flame-retardant PBT material, for example, the flame-retardant PBT material needs to meet the V0 flame-retardant requirement of UL-94, and for the glow wire test of IEC, a plurality of unattended electric appliance products put forward higher requirements on GWIT, and the requirements on GWIT850 ℃ need to be met.
Preferably, the high GWIT brominated flame retardant PBT has a GWIT of 850 ℃, a tensile strength of not less than 95MPa, and a notch impact strength of not less than 8kJ/m2The UL-94 flame resistance test is grade V0.
The invention has the beneficial effects that:
the invention provides a high GWIT flame-retardant PBT composition, which can effectively improve the GWIT of a brominated flame-retardant PBT through specific component compatibility, particularly the synergistic compatibility of antimony trioxide and calcium hydroxide, achieves 850 ℃ and realizes 1.60mmV 0-grade flame retardance, and meets the high GWIT requirement of unattended electric appliance products.
Meanwhile, the high GWIT flame-retardant PBT composition has high GWIT and V0 flame-retardant effects and good mechanical properties, the tensile strength can reach 110MPa, and the notch impact strength can reach 9.5kJ/m2The bending strength can reach 165MPa, the requirements of electronic and electric products on flame-retardant materials can be completely met, and the flame-retardant material is particularly suitable for unattended electronic and electric products.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.
In the examples, the properties were tested as follows:
wherein GWIT performance is tested according to test standard IEC 60695-2-12-2014
Tensile strength was tested according to test standard ISO 527-.
Notched impact strength was tested in accordance with test standard ISO 180-2000.
UL-94 flame resistance test, the thickness of 1.6mm is tested according to the test standard UL-94-2019.
Examples 1 to 7
The high GWIT flame-retardant PBT composition comprises the components shown in the table 1 in percentage by weight.
Wherein the PBT resin has a relative density of 1.30-1.32g/cm3The melting point is 215-230 ℃.
The brominated flame retardant is brominated epoxy resin.
The calcium hydroxide is calcium hydroxide with a particle size of 5 μm.
The preparation method of the high GWIT flame-retardant PBT composition comprises the following steps:
1) drying PBT at 135 deg.C for 4 hr;
2) and (2) mixing the dried PBT, the brominated flame retardant, the antimony trioxide and the calcium hydroxide in a high-speed mixer for 1 minute, adding the mixture into a double-screw extruder, feeding glass fibers from the side of the extruder, plasticizing, mixing, extruding, cooling and granulating at 220 ℃ to obtain the PBT composition with high GWIT.
TABLE 1 compositions of high GWIT brominated flame retardant PBT of examples 1-7
Example 8
The high GWIT flame-retardant PBT composition comprises the following components in percentage by weight:
50.5 parts of PBT resin
8 parts of brominated flame retardant
0.5 part of antimony trioxide
4 parts of calcium hydroxide
35 parts of alkali-free glass fiber.
Wherein the PBT resin has a relative density of 1.30-1.32g/cm3Melting point 215-.
The brominated flame retardant is brominated epoxy resin.
The calcium hydroxide has a particle size of 15 μm.
Comparative examples 1 to 4
The flame-retardant PBT composition comprises the components shown in the table 2 in percentage by weight.
Wherein the PBT resin has a relative density of 1.30-1.32g/cm3Melting point 215-.
The brominated flame retardant is brominated epoxy resin.
The calcium hydroxide is calcium hydroxide with a particle size of 5 μm.
The preparation method of the high GWIT flame-retardant PBT composition comprises the following steps:
1) drying PBT at 135 deg.C for 4 hr;
2) and mixing the dried PBT, the brominated flame retardant, the antimony trioxide and the calcium hydroxide in a high-speed mixer for 1 minute, adding the mixture into a double-screw extruder, feeding glass fibers from the side of the extruder, plasticizing, mixing, extruding, cooling and granulating at 220 ℃ to obtain the flame-retardant PBT composition.
TABLE 2 brominated flame retardant PBT compositions of comparative examples 1-4
| Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| PBT | 63.9 | 49 | 40 | 52 |
| Brominated epoxy resins | 7 | 11 | 10 | 7 |
| Antimony trioxide | 0.1 | 2 | 4 | 3 |
| Calcium hydroxide | 2 | 8 | 10 | 1 |
| Alkali-free glass fiber | 25 | 25 | 30 | 35 |
Comparative example 5
A high GWIT flame-retardant PBT composition is prepared from the following components in percentage by weight:
50.5 parts of PBT resin
8 parts of brominated flame retardant
4 parts of calcium hydroxide
35 parts of alkali-free glass fiber.
Wherein the PBT resin has a relative density of 1.30-1.32g/cm3Melting point 215-.
The brominated flame retardant is brominated epoxy resin.
The calcium hydroxide has a particle size of 5 μm.
Comparative example 6
A high GWIT flame-retardant PBT composition is prepared from the following components in percentage by weight:
50.5 parts of PBT resin
8 parts of brominated flame retardant
0.5 part of antimony trioxide
35 parts of alkali-free glass fiber.
Wherein the PBT resin has a relative density of 1.30-1.32g/cm3Melting point 215-.
The brominated flame retardant is brominated epoxy resin.
Result detection
The performance tests of the high GWIT brominated flame retardant PBT of the above examples and comparative examples comprise the flame retardant performance and the mechanical properties, and the specific test results are shown in the following tables 3 and 4.
Table 3. detection results of brominated flame retardant PBT with high GWIT in examples
Table 4 comparative example high GWIT brominated flame retardant PBT detection result
As can be seen from the examples and comparative examples, within the scope of protection of the present invention, through the synergistic compatibility of the components, especially the synergistic effect of antimony trioxide and calcium hydroxide, GWIT of 850 ℃ can be achieved, and good mechanical properties are provided.
Also, it can be seen from the data of comparative example that the antimony trioxide content of comparative example 1 is too low to reach UL-94V0 grade flame retardance, and the GWIT can only be raised to 750 ℃ and cannot meet the 850 ℃ requirement. And if the content of the antimony trioxide in the comparative examples 2-3 is too high, the GWIT temperature can not reach the requirement of 850 ℃, and the mechanical property is obviously reduced.
In addition, it can also be seen from the comparative example that when the calcium hydroxide content is too low, the GWIT temperature does not reach the requirement of 850 deg.C, for example, in comparative example 4, the GWIT temperature is only 725 deg.C, but when the calcium hydroxide content is too high, the mechanical properties are remarkably reduced. Therefore, the synergistic optimal effects of the mechanical property, the flame retardant property and the GWIT can be realized only within the content range protected by the invention.
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. This need not be, nor should it be 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 (6)
1. The high GWIT flame-retardant PBT composition is characterized by comprising the following components in parts by weight:
45-54 parts of PBT resin
8 parts of brominated flame retardant
0.5 part of antimony trioxide
4 to 6 portions of calcium hydroxide
30 to 35 parts of alkali-free glass fiber,
the bromine flame retardant is brominated epoxy resin,
the calcium hydroxide is calcium hydroxide with the particle size of 5 mu m.
2. The high GWIT flame retardant PBT composition of claim 1, wherein the PBT resin has a relative density of 1.30 to 1.32g/cm3The melting point is 215-230 ℃.
3. A process for preparing a high GWIT flame retardant PBT composition of claim 1 or 2, comprising the steps of:
uniformly mixing the PBT resin, the brominated flame retardant, the antimony trioxide and the calcium hydroxide in a high-speed mixer, adding the mixture into a double-screw extruder, feeding alkali-free glass fiber from the side of the extruder, plasticizing, mixing, extruding, cooling and granulating to obtain the high-GWIT flame-retardant PBT composition.
4. The preparation method according to claim 3, wherein the PBT resin is subjected to water removal treatment at 130-140 ℃ for 3-5 hours.
5. Use of the high GWIT flame retardant PBT composition of claim 1 or 2 in the manufacture of an electronic appliance.
6. The use of claim 5, wherein the high GWIT flame retardant PBT composition has a GWIT of 850 ℃, a tensile strength of 95MPa or more, a notched impact strength of 8kJ/m2 or more, and a UL-94 flame retardant rating of V0.
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| CN102391623A (en) * | 2011-09-30 | 2012-03-28 | 中山市纳普工程塑料有限公司 | Ultrahigh-glowing filament temperature and flame-retardant reinforced PBT (polybutylece terephthalate) composite material and preparation method thereof |
| CN102816415B (en) * | 2012-07-30 | 2014-06-04 | 南通星辰合成材料有限公司 | High-flame-retardant high-flowability polybutylene terephthalate resin composition |
| CN107418156B (en) * | 2017-04-21 | 2019-12-03 | 金旸（厦门）新材料科技有限公司 | A kind of high glow-wire enhancing flame retardant type PBT composite and preparation method thereof |
| CN112063128A (en) * | 2020-09-16 | 2020-12-11 | 佛山市汉纬新材料有限公司 | High-glow-wire impact-resistant high-fluidity reinforced flame-retardant PBT (polybutylene terephthalate) material and preparation method thereof |
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