CN115785625B - high-RTI value PBT/PET alloy composition, and preparation method and application thereof - Google Patents
high-RTI value PBT/PET alloy composition, and 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 auxiliary agent and 0.1-0.5 part of antioxidant; the cross-linking auxiliary agent is trimethylallyl isocyanate; particle diameter D of the calcium sulfate whisker 50 1-4 μm. The invention provides a high RTI value PBT/PET alloy composition, which has an RTI value of more than or equal to 135 ℃, far exceeds the level of the prior art and materials, and solves the core appeal of customers and related industries.
Description
Technical Field
The invention belongs to the technical field of engineering plastics, and particularly relates to a high RTI (room temperature ignition) value PBT/PET (polybutylene terephthalate/polyethylene terephthalate) alloy composition, and a preparation method and application thereof.
Background
Polybutylene terephthalate (PBT) is polymerized from terephthalic acid and butanediol by polycondensation, and at present, glass fiber reinforced PBT materials have been widely used in lighting fixtures, cooling fans, connectors, coil bobbins, electrical appliance housings and other electronic and electrical components. Polyethylene terephthalate (PET) is polymerized by terephthalic acid and ethylene glycol through polycondensation, is thermoplastic polyester which has the earliest commercialization and the widest 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 good dimensional stability.
RTI, an abbreviation for relative temperature index (relative temperature index), refers to the ability of a material to retain a certain property (e.g., mechanical, electrical, etc.) upon prolonged exposure to elevated temperatures, and is one way to evaluate the material's ability to withstand heat. RTI is the corresponding temperature calculated from the heat aging results that the performance remains 50% for 6 ten thousand hours of use. The higher the RTI value, the higher the temperature at which the material will generally be used for a long period of time. The theoretical basis of the RTI value is the arrhenius equation, and by solving the logarithmic logk=logea-E/RT, a linear function relationship between the logarithm of the material lifetime (logt 1/2) and the reciprocal of the absolute temperature (1/T) can be found from the formula. The RTI value (finally converted into the temperature) of the material is obtained by linear fitting of the logt1/2 at different temperatures and extrapolation to the corresponding temperature T (temperature of Fahrenheit) under the condition of 60000h end point. 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 particular property and a particular thickness.
The RTI index is an extremely important index widely accepted in the plastic industry at present and used for representing the long-term heat resistance of materials, and a material manufacturer can apply for RTI Huang Ka authentication to an UL organization, obtain an RTI value of the material after testing and identify the material Huang Kashang. End customers often perform early material selection based on the Huang Ka RTI value of the material on the UL website of the material, and thus if the RTI is low, the material tends to greatly limit the wide application of the plastic material in many fields, such as connectors, electrical switches, relays, and other electronic and electrical fields.
The flame-retardant reinforced PBT/PET alloy material has excellent mechanical property and good surface appearance, so that the flame-retardant reinforced PBT/PET alloy material 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 transesterification reaction between PBT and PET, the RTI value of the flame-retardant reinforced PBT/PET alloy system is lower than that of flame-retardant reinforced PBT and flame-retardant reinforced PET of a pure resin system, and the RTI value of the system is not more than 130 ℃ after the RTI of the flame-retardant reinforced PBT/PET alloy materials at home and abroad is searched on an UL website. The lower RTI value seriously affects and limits the practical popularization and application of the materials, and due to the continuous rigor of the product use environment, alloy materials with the RTI value of more than 135 ℃ are required to be used by a plurality of end users. At present, flame-retardant reinforced PBT/PET alloy materials meeting the requirements do not exist in the market.
According to the rules of UL RTI calculation, materials are required to have a relatively short lifetime t when aged at higher temperatures 1/2 And it is desirable to have a relatively longer life time t when aged at lower temperatures 1/2 In this way, when the curve is fitted and extrapolated to 60000h, the slope of the curve is larger, so that a higher RTI value can be obtained, rather than the conventional understanding that the longer the aging life time is under a certain temperature condition, the better the aging life time is, the more favorable the aging life time needs to be, and the gradient relation exists under different temperatures, so that the aging process of the UL needs to be carried out at multiple temperatures, and generally, 3-4 aging point temperatures are needed.
The invention discloses a polyester with heat aging resistance and a production method thereof, and the invention relates to an RTI concept, but the specific invention content does not relate to deduction calculation for RTI, aging test is not carried out according to UL RTI rule, even deviates from RTI rule, and a higher RTI value can not be obtained.
Disclosure of Invention
Aiming at the prior art problems, the invention provides a high RTI value PBT/PET alloy composition, which has an RTI value of more than or equal to 135 ℃, exceeds the level of the prior art and materials, solves the core appeal of clients and related industries, and has extremely high economic value and application prospect.
The second object of the invention is to provide a preparation method of the PBT/PET alloy composition with high RTI value.
A third object of the invention is to provide the use of a high RTI PBT/PET alloy composition in the field of electronics and electrics.
In order to achieve the above object, the present invention is realized by the following technical scheme:
a high RTI value 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 auxiliary agent and 0.1-0.5 part of antioxidant; the cross-linking auxiliary agent is trimethylallyl isocyanate; particle diameter D of the calcium sulfate whisker 50 1-4 μm.
Isocyanate can react with hydroxyl, carboxyl, amino and other groups on a resin molecular chain to form crosslinking, can rapidly initiate crosslinking reaction between the molecular chains, can remarkably improve the adhesive force, color stability, steaming and boiling resistance and the like of polyester, and is often used as a crosslinking auxiliary agent. The inventor discovers through long-term research that under the condition of higher ageing temperature, the use of the trimethylallyl isocyanate (TMAIC) can lead the PET/PBT system to have higher amplitude improvement of the performance retention rate at lower ageing temperature, and the phenomenon is very good in accordance with the 'gradient' relation required between high temperature and low temperature required by the RTI deduction calculation rule, thereby having important effect on obtaining higher RTI value of the material. The inventors hypothesize that this is probably the reason why the trimethallyl isocyanate has a trifunctional monomer with high thermal stability, which is far superior to other classes of isocyanate compounds both in water and in acidic environments. In addition, the inventor finds that in the polyester system, the calcium sulfate whisker in a specific particle size range can better improve the mechanical strength of the polyester system and also has better improving effect on the heat resistance stability of the polyester system. Under the combined action of the calcium sulfate whisker, the TMAIC and other components of the system in the specific particle size range, the PBT/PET alloy composition prepared by the invention has outstanding RTI value, and a large amount of experimental data show that only one or two additives are added or the addition amount is not in the limit range of the invention, and the performance effect of the invention is not enough.
Preferably, the PBT/PET alloy composition comprises, in parts by weight: 13-45 parts of polybutylene terephthalate, 13-30 parts of polyethylene terephthalate, 10-20 parts of brominated flame retardant, 2-6 parts of synergistic flame retardant, 10-40 parts of glass fiber, 0.5-2 parts of epoxy resin, 2-5 parts of calcium sulfate whisker, 1-3 parts of crosslinking auxiliary agent and 0.1-0.5 part of antioxidant. Within this preferred range, the PBT/PET alloy composition has an RTI value of 145 ℃ or greater.
Preferably, the epoxy resin has an epoxy equivalent of not less than 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, if the epoxy equivalent of the epoxy resin is too small, the performance of a material system can be slowly reduced at high temperature, and the material system cannot form a drop with data at low temperature, so that a higher RTI value is difficult to obtain; and the epoxy equivalent of the epoxy resin is too large, so that the crosslinking degree is too weak, and the stability of the resin system is affected. Within this preferred range, the PBT/PET alloy composition has a more excellent RTI value. Specifically, the method for testing the epoxy equivalent of the epoxy resin is based on GB/T4612-2008.
Further preferably, the epoxy resin has an epoxy equivalent of 2000 to 2800g/eq.
Preferably, the glass fibers are modified glass fibers.
Further preferably, the glass fibers are glass fibers modified with a coupling agent; the coupling agent is one or two selected from silane coupling agent and titanate coupling agent.
Further preferably, the coupling agent is one or more of N- (β -aminoethyl) - γ -aminopropyl trimethoxysilane, γ -methacryloxypropyl trimethoxysilane or isopropyl bis (methacryloyl) isostearyl titanate.
Further preferably, the mass ratio of N- (β -aminoethyl) - γ -aminopropyl trimethoxysilane, γ -methacryloxypropyl trimethoxysilane and isopropyl bis (methacryloyl) isostearyl titanate is (1-2): 1:3, a step of; 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. In the long-term high-temperature aging process, the better performance retention of the polyester system can be maintained. The inventor researches find that the isopropyl di (methacryloyl) isostearyl titanate coupling agent with higher proportion can endow the glass fiber with more excellent interface binding force between PBT and PET components, and (1-2): 1:3, the glass fiber has better interfacial bonding force with PBT and PET components.
Preferably, the brominated 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, with respect to phosphite antioxidants, sulfur-containing synergists or hindered amine antioxidants, hindered phenol antioxidants are prone to atom detachment from the molecule due to the existence of a steric barrier and combine with free radicals to terminate the chain reaction. In the aging process of the polymer, the polymer is relatively stable in the presence of the hindered phenol antioxidant, the possibility of further oxidation is reduced, and further the effect of stabilizing the product performance and improving the RTI value is achieved.
Further preferably, the antioxidant is selected from one or two of beta (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 1,3, 5-tris (4-tert-butyl-3-hydroxy-2, 6-dimethylbenzyl) -1,3, 5-triazine-2, 4,6- (1H, 3H, 5H) -trione. Specifically, beta (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl 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 polybutylene terephthalate has an intrinsic viscosity of 0.7 to 1.2dL/g at 23 ℃; 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 achieve 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: and mixing the brominated flame retardant, the synergistic flame retardant, the epoxy resin, the calcium sulfate whisker, the crosslinking auxiliary agent and the antioxidant, adding the polybutylene terephthalate, the polyethylene terephthalate and the glass fiber, mixing, and carrying out melt extrusion to obtain the PBT/PET alloy composition.
Preferably, the temperature of the melt extrusion is 220 to 270 ℃.
Preferably, the screw speed of the melt extrusion is 200 to 450rpm.
Preferably, the melt extrusion is performed by using a twin screw extruder having a barrel length to screw diameter ratio of (32 to 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 case of high requirements for long service life of the products in the above fields at high temperature. Specifically, the invention is applicable to electronic and electric products including, but not limited to, connectors, heat dissipation fans, coil backbones, capacitor housings, relays, and the like.
Compared with the prior art, the invention has the following beneficial effects: the invention adopts calcium sulfate 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 the excellent RTI value is prepared and obtained, 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 135 ℃, and is suitable for various occasions with high requirements of customers on the long-term use temperature of the material.
Detailed Description
The invention is further illustrated below in conjunction with the description and specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Examples and comparative examples raw material description:
polybutylene terephthalate (PBT 1) has an intrinsic viscosity of 1.0dL/g at 23℃and an intrinsic viscosity test method of GB/T14190-2017, GX121, instrument & chemical company.
Polybutylene terephthalate (PBT 2) has an intrinsic viscosity of 1.3dL/g at 23℃and an intrinsic viscosity test method of GB/T14190-2017, 1100-211X, vinca resin Co., ltd.
Polyethylene terephthalate (PET 1) has an intrinsic viscosity of 0.68dL/g at 23℃and a PET intrinsic viscosity test method of GB/T14190-2017, FG600, instrument and chemical company.
Polyethylene terephthalate (PET 2) has an intrinsic viscosity of 0.88dL/g at 23℃and a PET intrinsic viscosity test method of GB/T14190-2017, CR-8828, zhuhai Huarun chemical materials science and technology Co.
Glass fiber: ESC303HR-3-H, chongqing International composite Co., ltd.
Coupling agent 1: n- (beta-aminoethyl) -gamma-aminopropyl trimethoxysilane, nanjing full-chemical Co., ltd.
Coupling agent 2: gamma-methacryloxypropyl trimethoxysilane, nanjing LongTian-Dai-Ganyu chemical Co.
Coupling agent 3: isopropyl di (methacryloyl) isostearyl titanate, huang Shanshi family berui new materials technologies inc.
Coupling agent 4: gamma- (2, 3-glycidoxy) propyltrimethoxysilane, shanghai pacifying Utility Co.
Epoxy resin 1: the epoxy equivalent is 2500g/eq, and the test method of the epoxy equivalent is GB/T4612-2008, 0199, nantong star synthetic materials Co.
Epoxy resin 2: the epoxy equivalent is 480g/eq, and the test method of the epoxy equivalent is GB/T4612-2008, CYD-011, yueyang Baling petrochemical Hua Xing 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, a company of Kunshan, chemical industry, china.
Calcium sulfate whisker 1: particle diameter D 50 =2.5 μm, DL-40H, shenzhen super bang New energy materials Co., ltd.
Calcium sulfate whisker 2: particle diameter D 50 =6μm, NP-S01, shandong jiali chemical engineering limited.
Trimethylallyl isocyanate, TMAIC, shanghai derivative chemical company, inc.
Triallyl isocyanurate, TAIC, hunan people chemical company limited.
Antioxidant 1, beta (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate (antioxidant 1076), RIANOX1076, tianjin Li Anlong New Material Co., ltd.
Antioxidant 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 Material Co., ltd.
Antioxidant 3,4.4 bis (α, α -dimethylbenzyl) diphenylamine, naugard 445, a company of the american type.
Brominated flame retardant: brominated polystyrene, BPS 7010, shandong-day chemical company limited.
Brominated poly (pentabromobenzyl acrylate), FR-1025, israel dead sea Bromide company.
A high molecular brominated epoxy flame retardant, F-2100, available from Ishikawa Bromide, inc.
Synergistic flame retardant: sodium antimonate (or antimony white), commercially available.
The components (e.g., synergistic flame retardants) selected for each of the parallel examples and comparative examples are the same commercially available products, unless otherwise specified.
Examples 1 to 4
The parts by weight of the raw materials used in the examples below are shown in Table 1.
The following examples use the same preparation method, and the specific steps include:
(1) Weighing brominated flame retardant, synergistic flame retardant, epoxy resin, calcium sulfate whisker, trimethylallyl isocyanate and antioxidant according to the parts by weight of 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 acrylate) in a mass ratio of 3: 1.
(2) Dispersing glass fiber in a coupling agent, and 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, a step of; the mixture obtained in the step (1), polybutylene terephthalate, polyethylene terephthalate and modified glass fiber are respectively added into a double-screw extruder through a feeder, wherein the temperature of a first area from a feeding port to a machine head of the double-screw extruder is 220-250 ℃, the temperature of a second area is 250-270 ℃, the temperature of a third area is 245-265 ℃, the temperature of a fourth area is 245-265 ℃, the temperature of a fifth area is 245-265 ℃, the temperature of a sixth area is 250-270 ℃, the temperature of a seventh area is 250-270 ℃, the temperature of an eighth area is 240-260 ℃, the temperature of a ninth area is 240-260 ℃, the temperature of a tenth area is 250-270 ℃, the rotating speed of a screw is 200-450 rpm, and 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: the coupling agent 4 is adopted 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 brominated flame retardant is a high molecular brominated epoxy flame retardant.
Example 8 differs from example 1 in that: brominated polystyrene and brominated poly (pentabromobenzyl acrylate) in a mass ratio of 5:1.
example 9 differs from example 1 in that: 4.4-bis (alpha, alpha-dimethylbenzyl) diphenylamine was used as an antioxidant.
Example 10 differs from example 1 in that: brominated polystyrene and brominated poly (pentabromobenzyl acrylate) in a mass ratio of 2:1.
example 11 differs from example 1 in that: brominated polystyrene and brominated poly (pentabromobenzyl acrylate) in a mass ratio of 4:1.
the parts by weight 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 each comparative example below are shown in Table 2.
The specific preparation procedure of each comparative example was the same as in example 1.
Table 1 shows the formulation components of the examples:
TABLE 1
Table 2 shows the formulation components of each comparative example:
TABLE 2
| Component (A) | 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 |
| Brominated flame 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 prepared PBT/PET alloy compositions used 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 baked at 120℃for 6 hours, and then injection molded into 3mm thick, ISO 5271BA standard bars, ASTM D256, 3.2mm thick notched impact bars, 60X 0.75mm square plates for tensile properties, notched impact properties, and dielectric strength properties, respectively.
Taking the performance of a spline for testing tensile performance after being subjected to oven annealing at 180 ℃ for 48 hours as an initial aging performance; the aged bars were then subjected to aging performance tests (bars for testing notched impact properties, square plates for testing dielectric strength properties were similarly operated) at four aging temperature points (one for each bar) of 210 ℃, 200 ℃, 190 ℃, 180 ℃ respectively, the above temperature points were sampled and tested at sampling intervals of 3 days, 7 days, 14 days, 28 days, respectively, and the performance of the sampled test was divided by the initial performance to obtain a performance retention (%) until an aging time F50 (F50 means an aging time corresponding to a performance decay to 50% of the initial value at a certain aging temperature) was obtained for each performance decay to 50%. And finally, according to the UL rule, LOG (F50) at different temperatures is extrapolated to 60000h in a linear fitting mode to obtain corresponding aging temperatures, and further, the RTI value of the material is obtained.
Wherein, tensile strength (MPa): the test was carried out using the test method of ISO 527:2000.
Notched impact strength (J/m): the test was performed using the test method of ASTM D256:2006.
Dielectric strength (kV/mm): the test was performed using the test method of IEC 60243-1:1998.
Tables 3 and 4 show the performance test results of each example and comparative example, respectively.
TABLE 3 Table 3
TABLE 4 Table 4
The foregoing examples are illustrative only and are provided to illustrate some of the features of the methods of the present invention. The claims that follow are intended to claim the broadest possible scope as conceivable and the embodiments presented herein are demonstrated for the applicant's true test results. It is, therefore, not the intention of the applicant that the appended claims be limited by the choice of examples illustrating the features of the invention. Some numerical ranges used in the claims also include sub-ranges within which variations in these ranges should also be construed as being covered by the appended claims where possible.
Claims (10)
1. The high RTI value PBT/PET alloy composition 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 auxiliary agent and 0.1-0.5 part of antioxidant;
the cross-linking auxiliary agent is trimethylallyl isocyanate;
particle diameter D of the calcium sulfate whisker 50 1-4 μm.
2. The PBT/PET alloy composition of claim 1, comprising, in parts by weight: 13-45 parts of polybutylene terephthalate, 13-30 parts of polyethylene terephthalate, 10-20 parts of brominated flame retardant, 2-6 parts of synergistic flame retardant, 10-40 parts of glass fiber, 0.5-2 parts of epoxy resin, 2-5 parts of calcium sulfate whisker, 1-3 parts of crosslinking auxiliary agent and 0.1-0.5 part of antioxidant.
3. The PBT/PET alloy composition according to claim 1, wherein the epoxy resin has an epoxy equivalent of not less than 2000g/eq.
4. The PBT/PET alloy composition of claim 1, wherein the glass fibers are modified glass fibers.
5. The PBT/PET alloy composition of claim 4, wherein the glass fibers are glass fibers modified with a coupling agent; the coupling agent is one or more of N- (beta-amino ethyl) -gamma-amino propyl trimethoxy silane, gamma-methacryloxypropyl trimethoxy silane or isopropyl di (methacryloyl) isostearyl titanate.
6. The PBT/PET alloy composition of claim 1, wherein the brominated flame retardant is one or both of brominated polystyrene and brominated pentabromobenzyl polyacrylate.
7. The PBT/PET alloy composition of claim 1, wherein the antioxidant is a hindered phenolic antioxidant.
8. The PBT/PET alloy composition of claim 1, wherein the polybutylene terephthalate has an intrinsic viscosity of 0.7 to 1.2dL/g at 23 ℃; the intrinsic viscosity of the polyethylene terephthalate at 23 ℃ is 0.5-0.8 dL/g.
9. The process for preparing a PBT/PET alloy composition according to any one of claims 1 to 8, comprising the steps of: and mixing the brominated flame retardant, the synergistic flame retardant, the epoxy resin, the calcium sulfate whisker, the crosslinking auxiliary agent and the antioxidant, adding the polybutylene terephthalate, the polyethylene terephthalate and the glass fiber, mixing, and carrying out melt extrusion to obtain the PBT/PET alloy composition.
10. Use of the PBT/PET alloy composition according to any of claims 1 to 8 in the field of electronics and electrical.
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