CN115785625A - PBT/PET alloy composition with high RTI value as well as preparation method and application thereof - Google Patents
PBT/PET alloy composition with high RTI value as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a PBT/PET alloy composition with a high RTI value. The PBT/PET alloy composition comprises the following components in parts by weight:13-45 parts of polybutylene terephthalate, 7-30 parts of polyethylene terephthalate, 10-20 parts of brominated flame retardant, 2-6 parts of synergistic flame retardant, 10-40 parts of glass fiber, 0.5-3 parts of epoxy resin, 2-6 parts of calcium sulfate whisker, 1-4 parts of crosslinking assistant and 0.1-0.5 part of antioxidant; the crosslinking auxiliary agent is trimethyl allyl isocyanate; the particle size D of the calcium sulfate whisker 50 Is 1-4 μm. The invention provides a PBT/PET alloy composition with a high RTI value, which has an RTI value of more than or equal to 135 ℃, is far beyond the level of the prior art and materials, and solves the core requirements of customers and related industries.
Description
Technical Field
The invention belongs to the technical field of engineering plastics, and particularly relates to a PBT/PET alloy composition with a high RTI value, and a preparation method and application thereof.
Background
Polybutylene terephthalate (PBT) is polymerized by terephthalic acid and butanediol through polycondensation reaction, and the PBT material reinforced by glass fiber is widely applied to lighting lamps, cooling fans, connectors, coil frameworks, electric appliance shells and other electronic and electrical components at present. Polyethylene terephthalate (PET), which is polymerized from terephthalic acid and ethylene glycol by polycondensation, is a thermoplastic polyester which is most commercialized and widely used in the application field, has excellent physical and mechanical properties in a wider temperature range, has excellent electrical insulation, and has good electrical properties even at high temperature and high frequency, but has poor corona resistance, creep resistance, fatigue resistance, friction resistance and dimensional stability.
RTI, the abbreviation of relative temperature index (relative temperature index), refers to the ability of a material to retain certain properties (e.g., mechanical properties, electrical properties, etc.) when exposed to high temperatures for a long period of time, and is a way to evaluate the heat-bearing capacity of a material. The RTI is the corresponding temperature for which the performance is maintained at 50% for 6 ten thousand hours as deduced from the thermal ageing results. The higher the RTI value, the higher the long-term service temperature of the material is generally represented. The theoretical basis for the RTI value is the Arrhenius equation, where the logarithm of the life of the material (logt 1/2) is found to be a linear function of the reciprocal of the absolute temperature (1/T) by finding the logarithm of loggeK = logEA-E/RT. The RTI value of the material (finally converted to centigrade) is determined by linear fitting of logt1/2 at different temperatures and extrapolation to the temperature T (Fahrenheit) corresponding to the end point of 60000 h. A material comprises a plurality of RTI values (RTI-Elec: dielectric strength; RTI-Imp: impact strength; RTI-Str: tensile strength), each index corresponding to a specific property and a specific thickness.
The RTI index is an extremely important index for representing the long-term heat resistance of the material which is widely accepted in the plastic industry at present, and a material manufacturer can obtain the RTI value of the material after testing by applying for RTI Huang Ka certification to a UL mechanism and identify the RTI value on the corresponding material Huang Ka. The end customer often carries out the material selection work of earlier stage according to Huang Ka RTI value of the material on the UL website, so if the RTI of the material is lower, the wide application of the plastic material in many fields, such as connectors, electrical switches, relays and other electronic and electrical fields, can be greatly limited.
The flame-retardant reinforced PBT/PET alloy material has excellent mechanical properties and good surface appearance, and is more and more widely applied to industries such as cooling fans, household appliances, connectors and the like in recent years; on the other hand, due to the existence of ester exchange reaction between the PBT and the PET, the RTI value of the flame-retardant reinforced PBT/PET alloy system is lower than that of the flame-retardant reinforced PBT and the flame-retardant reinforced PET of a pure resin system, and after the RTI of the flame-retardant reinforced PBT/PET alloy material at home and abroad is retrieved on a UL website, the RTI value of the system is not more than 130 ℃. The practical popularization and application of the material are seriously influenced and limited by the lower RTI value, and because the use environment of the product is continuously severe, most end customers require the alloy material with the RTI value of more than 135 ℃. At present, no flame-retardant reinforced PBT/PET alloy material meeting the requirements is available on the market.
According to the rules of UL RTI calculations, materials are required to have a relatively short life time t when aged at higher temperatures 1/2 And a relatively longer life time t is required for aging at a lower temperature 1/2 Therefore, when the curve is fitted and extrapolated to 60000h, the slope of the curve is larger, and a higher RTI value can be obtained, but the condition that the aging life time is longer and better under a certain temperature condition is not required to be understood in the conventional wayThe 'gradient' relationship exists at the same temperature, the UL requires that the aging process is carried out at multiple points, and generally 3 to 4 aging point temperatures are required.
Although the invention refers to the RTI concept, the invention content does not relate to calculation deduction aiming at RTI, aging test is not carried out according to UL RTI rules, even deviates from the RTI rules, and higher RTI value cannot be expected.
Disclosure of Invention
Aiming at the prior technical problems, the invention provides the PBT/PET alloy composition with the high RTI value, the composition has the RTI value of more than or equal to 135 ℃, exceeds the level of the prior art and materials, solves the core requirements of customers and related industries, and has extremely high economic value and application prospect.
The second purpose of the invention is to provide a preparation method of the PBT/PET alloy composition with high RTI value.
The third purpose of the invention is to provide the application of the PBT/PET alloy composition with high RTI value in the electronic and electrical fields.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a PBT/PET alloy composition with a high RTI value comprises the following components in parts by weight: 13-45 parts of polybutylene terephthalate, 7-30 parts of polyethylene terephthalate, 10-20 parts of brominated flame retardant, 2-6 parts of synergistic flame retardant, 10-40 parts of glass fiber, 0.5-3 parts of epoxy resin, 2-6 parts of calcium sulfate whisker, 1-4 parts of crosslinking assistant and 0.1-0.5 part of antioxidant; the crosslinking auxiliary agent is trimethyl allyl isocyanate; the particle diameter D of the calcium sulfate whisker 50 Is 1-4 μm.
Isocyanate can react with hydroxyl, carboxyl, amino and other groups on a resin molecular chain to form crosslinking, can quickly initiate the crosslinking reaction between the molecular chains, can obviously improve the adhesive force, color stability, boiling-resistant disinfection capability and the like of polyester, and is often used as a crosslinking assistant. The inventor finds that the performance retention rate of a PET/PBT system can be improved to a higher extent at a lower aging temperature by using trimethyl allyl isocyanate (TMAIC) under the condition of a higher aging temperature, and the phenomenon well accords with the gradient relation required by high and low temperatures required by RTI deduction calculation rules, so that the PET/PBT material has an important effect on obtaining a higher RTI value. The inventors surmise that this is probably the reason why trifunctional monomers with high thermal stability of trimethallyl allyl isocyanate are far superior to other types of isocyanate compounds in both water and acidic environment. In addition, the inventor discovers through research that in the polyester system, calcium sulfate whiskers in a specific particle size range not only can better improve the mechanical strength of the polyester system, but also has a better improving effect on the heat resistance stability of the polyester system. Under the combined action of the calcium sulfate whiskers with the specific particle size range, the TMAIC and other components of the system, the PBT/PET alloy composition prepared by the invention has an outstanding RTI value, and a large amount of experimental data shows that the performance effect of the invention cannot be achieved by only adding one or two additives or adding the additives within the range not limited by the invention.
Preferably, the PBT/PET alloy composition comprises, in parts by weight: 13 to 45 parts of polybutylene terephthalate, 13 to 30 parts of polyethylene terephthalate, 10 to 20 parts of brominated flame retardant, 2 to 6 parts of synergistic flame retardant, 10 to 40 parts of glass fiber, 0.5 to 2 parts of epoxy resin, 2 to 5 parts of calcium sulfate whisker, 1 to 3 parts of crosslinking assistant and 0.1 to 0.5 part of antioxidant. Within this preferred range, the PBT/PET alloy composition has an RTI value of 145 ℃ or more.
Preferably, the epoxy equivalent of the epoxy resin is more than or equal to 2000g/eq. The inventor finds that the epoxy resin with specific epoxy equivalent can effectively improve the performance retention rate of the material after high-temperature aging, and if the epoxy equivalent of the epoxy resin is too small, the performance of a material system can be slowly reduced at high temperature, a fall can not be formed between the epoxy resin and data at low temperature, and a higher RTI value is difficult to obtain; if the epoxy equivalent of the epoxy resin is too large, the degree of crosslinking is too weak, which affects the stability of the resin system. Within this preferred range, the PBT/PET alloy composition has a more excellent RTI value. Specifically, the test method of the epoxy equivalent of the epoxy resin is according to GB/T4612-2008.
More preferably, the epoxy equivalent of the epoxy resin is 2000 to 2800g/eq.
Preferably, the glass fibers are modified glass fibers.
Further preferably, the glass fiber is a glass fiber modified with a coupling agent; the coupling agent is selected from one or two of silane coupling agent and titanate coupling agent.
Further preferably, the coupling agent is one or more of N- (β -aminoethyl) - γ -aminopropyltrimethoxysilane, γ -methacryloxypropyltrimethoxysilane, or isopropylbis (methacryloyl) isostearoyl titanate.
Further preferably, the mass ratio of N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane and isopropylbis (methacryloyl) isostearoyl titanate is (1-2): 1:3; most preferably, the mass ratio is 2:1:3. the glass fiber modified by the coupling agent has more excellent interface performance with PBT and PET components in a polyester system. And in the long-term high-temperature aging process, the better performance retention rate of the polyester system can be maintained. The inventor researches and discovers that a higher proportion of isopropyl di (methacryloyl) isostearyl titanate coupling agent can endow the glass fiber with more excellent interface bonding force between PBT and PET components, and the weight ratio of (1-2): 1: the preferable mass ratio of 3 can ensure that the glass fiber has better interface bonding force with the PBT and PET components.
Preferably, the bromine-based flame retardant is one or two of brominated polystyrene and brominated poly (pentabromobenzyl) acrylate.
Further preferably, the mass ratio of the brominated polystyrene to the brominated poly (pentabromobenzyl) acrylate is (2-4): 1.
preferably, the antioxidant is a hindered phenol antioxidant. The inventors have found through studies that, in the case of a phosphite antioxidant, a sulfur-containing synergist or a hindered amine antioxidant, a hindered phenol antioxidant is likely to have atoms detached from the molecule due to the existence of a steric barrier, and to bind to a radical to terminate the chain reaction. In the aging process of the polymer, the polymer is relatively stable in the presence of hindered phenol antioxidants, the possibility of further oxidation is reduced, and the effects of stabilizing the product performance and improving the RTI value are achieved.
Further preferably, the antioxidant is selected from one or two of beta (3,5 di-tert-butyl-4-hydroxyphenyl) propionic acid octadecyl ester, 1,3,5-tris (4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) -1,3,5-triazine-2,4,6- (1H, 3H, 5H) -trione. Specifically, octadecyl beta (3,5 di-tert-butyl-4-hydroxyphenyl) propionate and 1,3,5-tris (4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) -1,3,5-triazine-2,4,6- (1H, 3H, 5H) -trione can be compounded in any proportion.
Preferably, the intrinsic viscosity of the polybutylene terephthalate at 23 ℃ is 0.7-1.2 dL/g; the intrinsic viscosity of the polyethylene terephthalate at 23 ℃ is 0.5-0.8 dL/g. The polybutylene terephthalate and the polyethylene terephthalate within the intrinsic viscosity range can obtain better mixing effect and balance the fluidity and the mechanical property. Specifically, the intrinsic viscosity test method of polybutylene terephthalate and polyethylene terephthalate is GB/T14190-2017.
Preferably, the synergistic flame retardant is selected from one or two of sodium antimonate and antimony white.
In addition, the invention also provides a preparation method of the PBT/PET alloy composition, which comprises the following steps: mixing the brominated flame retardant, the synergistic flame retardant, the epoxy resin, the calcium sulfate whisker, the crosslinking assistant and the antioxidant, adding polybutylene terephthalate, polyethylene terephthalate and glass fiber, mixing, and performing melt extrusion to obtain the PBT/PET alloy composition.
Preferably, the melt extrusion temperature is 220 to 270 ℃.
Preferably, the rotation speed of the melt-extrusion screw is 200 to 450rpm.
Preferably, the melt extrusion is carried out by using a double-screw extruder, and the ratio of the barrel length to the screw diameter of the double-screw extruder is (32-48): 1.
preferably, the invention also protects the application of the PBT/PET alloy composition in the field of electronics and electrics. Especially in the occasions with higher requirements on the long-term service life of the products in the field at high temperature. Specifically, the present invention is applicable to electronic and electrical products such as connectors, heat dissipation fans, coil bobbins, capacitor cases, relays, and the like.
Compared with the prior art, the invention has the following beneficial effects: the invention adopts calcium sulfate crystal whisker with specific particle size range and specific cross-linking auxiliary agent (TMAIC); under the combined action of the additives and other components in the system, the PBT/PET alloy composition with excellent RTI value is prepared, and the RTI value of the PBT/PET alloy composition is more than or equal to 135 ℃. Can be used for a long time at the temperature of 135 ℃, and is suitable for various occasions with higher requirements of customers on the long-term use temperature of the material.
Detailed Description
The invention is further illustrated by the following description and specific examples, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Examples and comparative example raw material descriptions:
polybutylene terephthalate (PBT 1) with an intrinsic viscosity of 1.0dL/g at 23 ℃ according to the test method GB/T14190-2017, GX121, daizhizai chemical fibers Co.
Polybutylene terephthalate (PBT 2) having an intrinsic viscosity of 1.3dL/g at 23 ℃ according to the test method GB/T14190-2017, 1100-211X, catharan synthetic resins works Ltd.
Polyethylene terephthalate (PET 1) with an intrinsic viscosity at 23 ℃ of 0.68dL/g, according to the test method for the intrinsic viscosity of PET GB/T14190-2017, FG600, daizhizai chemical fiber company.
Polyethylene terephthalate (PET 2) having an intrinsic viscosity of 0.88dL/g at 23 ℃ according to the test method GB/T14190-2017, CR-8828, wako pure chemical materials science and technology Ltd.
Glass fiber: ESC303HR-3-H, chongqing International composite materials, inc.
Coupling agent 1: n- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane, nanjing Quanxi chemical Co., ltd.
Coupling agent 2: gamma-methacryloxypropyltrimethoxysilane, nanjing warp Tianyu chemical Co., ltd.
Coupling agent 3: isopropyl bis (methacryloyl) isostearyl titanate, berey new materials science and technology ltd, yellow mountain.
Coupling agent 4: gamma- (2,3-glycidoxy) propyltrimethoxysilane, shanghai Hao Sheng Kogyo Co., ltd.
Epoxy resin 1: the epoxy equivalent is 2500g/eq, and the test method of the epoxy equivalent is GB/T4612-2008, 0199, nantong Xincheng synthetic materials Co., ltd.
Epoxy resin 2: the epoxy equivalent is 480g/eq, and the test method of the epoxy equivalent is GB/T4612-2008, CYD-011, yueyang Barring petrochemical Huaxing petrochemical Co.
Epoxy resin 3: the epoxy equivalent is 3000g/eq, and the test method of the epoxy equivalent is GB/T4612-2008, YD-019, national chemical industry (Kunshan) Co., ltd.
Calcium sulfate whisker 1: particle diameter D 50 And 2.5 μm, DL-40H, shenzhen, shenbang New energy materials, inc.
Calcium sulfate whisker 2: particle diameter D 50 =6 μm, NP-S01, kagaku chemical science and technology, shandong.
Trimethallyl isocyanate, TMAIC, shanghai derived chemical Co., ltd.
Triallyl isocyanurate, TAIC, lakan national chemical company, ltd.
Antioxidant octadecyl 1, beta (3,5 di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1076), RIANOX1076, tianjin Li Anlong New materials GmbH.
Antioxidants 2,1,3,5-tris (4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) -1,3,5-triazine-2,4,6- (1H, 3H, 5H) -trione (antioxidant 1790), RIANOX 1790, tianjin Li Anlong, new materials GmbH.
Antioxidant 3,4.4-bis (α, α -dimethylbenzyl) diphenylamine, naugard 445, corpio, usa.
Bromine-based flame retardant: brominated polystyrene, BPS 7010, shandongtian chemical corporation.
Brominated Polypentabromobenzyl acrylate, FR-1025, israel dead sea Bromide.
Polymeric brominated epoxy flame retardant, F-2100, israel dead sea bromine.
Synergistic flame retardant: sodium antimonate (or antimony white), commercially available.
The components (e.g., synergistic flame retardants) selected in each of the parallel examples and comparative examples were the same commercial product, unless otherwise specified.
Examples 1 to 4
The weight parts of the raw materials used in the following examples are shown in table 1.
The following embodiments adopt the same preparation method, and the specific steps comprise:
(1) Weighing brominated flame retardants, synergistic flame retardants, epoxy resin, calcium sulfate whiskers, trimethallyl allyl isocyanate and antioxidants according to the weight parts in the table 1, and putting the materials into a high-speed mixer for dry mixing for 3-6 min at the rotating speed of 500-800 rpm; wherein the brominated flame retardant is brominated polystyrene and brominated poly (pentabromobenzyl) in a mass ratio of (3): 1 and mixing.
(2) Dispersing the glass fiber in a coupling agent, stirring and mixing for 5-8 min at 20-40 ℃ to obtain modified glass fiber; wherein the mass ratio of the coupling agent 1 to the coupling agent 2 to the coupling agent 3 is 2:1:3; adding the mixture obtained in the step (1), polybutylene terephthalate, polyethylene terephthalate and modified glass fiber into a double-screw extruder through feeders respectively, wherein the temperature of the double-screw extruder from a feeding port to a first zone of a machine head is 220-250 ℃, the temperature of the second zone is 250-270 ℃, the temperature of the third zone is 245-265 ℃, the temperature of the fourth zone is 245-265 ℃, the temperature of the fifth zone is 245-265 ℃, the temperature of the sixth zone is 250-270 ℃, the temperature of the seventh zone is 250-270 ℃, the temperature of the eighth zone is 240-260 ℃, the temperature of the ninth zone is 240-260 ℃, the temperature of the tenth zone is 250-270 ℃, the rotation speed of the screws is 200-450 rpm, the length-diameter ratio is 40:1, mixing, dispersing, melt extruding and granulating to obtain the PBT/PET alloy composition.
Examples 5 to 20
Example 5 differs from example 1 in that: coupling agent 4 is used in the modified glass fiber.
Example 6 differs from example 1 in that: the mass ratio of the coupling agent 1 to the coupling agent 2 to the coupling agent 3 is 2:1:1.
example 7 differs from example 1 in that: the bromine flame retardant is a high-molecular brominated epoxy flame retardant.
Example 8 differs from example 1 in that: brominated polystyrene and brominated polyacrylic acid pentabromobenzyl ester are mixed according to the mass ratio of 5:1.
example 9 differs from example 1 in that: 4, 4-bis (alpha, alpha-dimethylbenzyl) diphenylamine is used as an antioxidant.
Example 10 differs from example 1 in that: brominated polystyrene and brominated polyacrylic acid pentabromobenzyl ester are mixed according to the mass ratio of 2:1.
example 11 differs from example 1 in that: brominated polystyrene and brominated polyacrylic acid pentabromobenzyl ester are mixed according to the mass ratio of 4:1.
the weight parts of the raw materials used in examples 12 to 20 are shown in Table 1.
Comparative examples 1 to 5
The parts by weight of the raw materials used in the following comparative examples are shown in Table 2.
The specific preparation procedure for each comparative example was the same as in example 1.
Table 1 shows the formulation components for each example:
TABLE 1
Table 2 shows the formulation components for each ratio:
TABLE 2
| Components | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| PBT1 | 30.8 | 30.8 | 30.8 | 30.8 | 30.8 |
| PET1 | 15.4 | 15.4 | 15.4 | 15.4 | 15.4 |
| Bromine seriesFlame retardant | 13 | 13 | 13 | 13 | 13 |
| Synergistic flame retardant | 4 | 4 | 4 | 4 | 4 |
| Modified glass fiber | 30 | 30 | 30 | 30 | 30 |
| Epoxy resin 1 | 0 | 1.5 | 1.5 | 1.5 | 1.5 |
| Calcium sulfate whisker 1 | 3 | 0 | 3 | 0 | 3 |
| Calcium sulfate whisker 2 | 0 | 0 | 0 | 3 | 0 |
| TMAIC | 2 | 2 | 0 | 2 | 0 |
| TAIC | 0 | 0 | 0 | 0 | 2 |
| Antioxidant 1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Antioxidant 2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
The raw materials and the PBT/PET alloy compositions prepared in the above examples and comparative examples were tested according to the following test methods:
the PBT/PET alloy compositions prepared in examples and comparative examples were injection-molded into 3mm thick, ISO 5271BA standard bar, ASTM D256 3.2mm thick notched impact bar, 60X 0.75mm square plate after baking at 120 ℃ for 6 hours, and were used for tensile property, notched impact property, and dielectric strength property tests, respectively.
Taking the performance of the sample strip for testing tensile property after being subjected to oven annealing at 180 ℃ for 48 hours as the initial aging performance; and then, respectively carrying out aging performance tests on the aged sample strips at four aging temperature points (one sample strip corresponds to one temperature point) of 210 ℃, 200 ℃, 190 ℃ and 180 ℃ (the sample strips for testing the notch impact performance and the square plates for testing the dielectric strength performance are operated in the same way), respectively carrying out sampling tests on the above temperature points according to sampling intervals of 3 days, 7 days, 14 days and 28 days, and dividing the performance of the sampling tests by the initial performance to obtain a performance retention rate (%), until obtaining an aging time F50 (F50 refers to the aging time corresponding to the performance decaying to the initial value of 50% at a certain aging temperature). And finally, extrapolating LOG (F50) at different temperatures to 60000h by a linear fitting mode according to UL rules to obtain the corresponding aging temperature, and further obtaining the RTI value of the material.
Wherein, tensile strength (MPa): the test was carried out using the test method of ISO527: 2000.
Notched impact strength (J/m): the test was carried out using the test method of ASTM D256: 2006.
Dielectric strength (kV/mm): the test was carried out using the test method of IEC 60243-1.
Tables 3 and 4 show the results of the performance tests of the examples and comparative examples, respectively.
TABLE 3
TABLE 4
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim the broadest possible scope that can be conceived and the examples presented herein are demonstrated by the results of actual testing by the applicant. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Where the claims recite a range of values, such ranges are intended to include all sub-ranges subsumed therein, and variations within the ranges are intended to be encompassed by the claims as appended hereto where possible.
Claims (10)
1. The PBT/PET alloy composition with the high RTI value is characterized by comprising the following components in parts by weight: 13-45 parts of polybutylene terephthalate, 7-30 parts of polyethylene terephthalate, 10-20 parts of brominated flame retardant, 2-6 parts of synergistic flame retardant, 10-40 parts of glass fiber, 0.5-3 parts of epoxy resin, 2-6 parts of calcium sulfate whisker, 1-4 parts of crosslinking assistant and 0.1-0.5 part of antioxidant;
the crosslinking auxiliary agent is trimethyl allyl isocyanate;
the particle size D of the calcium sulfate whisker 50 Is 1-4 μm.
2. The PBT/PET alloy composition of claim 1, comprising, in parts by weight: 13 to 45 parts of polybutylene terephthalate, 13 to 30 parts of polyethylene terephthalate, 10 to 20 parts of brominated flame retardant, 2 to 6 parts of synergistic flame retardant, 10 to 40 parts of glass fiber, 0.5 to 2 parts of epoxy resin, 2 to 5 parts of calcium sulfate whisker, 1 to 3 parts of crosslinking assistant and 0.1 to 0.5 part of antioxidant.
3. The PBT/PET alloy composition according to claim 1, wherein the epoxy resin has an epoxy equivalent of 2000g/eq or more.
4. The PBT/PET alloy composition of claim 1, wherein the glass fiber is a modified glass fiber.
5. The PBT/PET alloy composition of claim 4, wherein the glass fiber is a coupling agent-modified glass fiber; the coupling agent is one or more of N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane or isopropyl di (methacryloyl) isostearoyl titanate.
6. The PBT/PET alloy composition as described in claim 1, wherein the bromine-based flame retardant is one or two of brominated polystyrene and brominated poly (pentabromobenzyl acrylate).
7. The PBT/PET alloy composition of claim 1, wherein the antioxidant is a hindered phenol antioxidant.
8. The PBT/PET alloy composition of claim 1, wherein the polybutylene terephthalate has an intrinsic viscosity at 23 ℃ of 0.7 to 1.2dL/g; the intrinsic viscosity of the polyethylene terephthalate at 23 ℃ is 0.5-0.8 dL/g.
9. A process for the preparation of a PBT/PET alloy composition according to any one of claims 1 to 8, comprising the steps of: mixing the brominated flame retardant, the synergistic flame retardant, the epoxy resin, the calcium sulfate whisker, the crosslinking assistant and the antioxidant, adding polybutylene terephthalate, polyethylene terephthalate and glass fiber, mixing, and performing melt extrusion to obtain the PBT/PET alloy composition.
10. Use of the PBT/PET alloy composition according to any one of claims 1 to 8 in the field of electronics.
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