CN111073230A - Low-dielectric-constant PC/PBT alloy material and preparation method thereof - Google Patents
Low-dielectric-constant PC/PBT alloy material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a low-dielectric-constant PC/PBT alloy material, which comprises 20-70% of PC, 20-70% of PBT, 0-20% of minerals, 0-20% of low-dielectric-constant fillers, 1-5% of a compatilizer, 0-2% of a foaming agent, 0.3-3% of a lubricant and 0.1-1% of an antioxidant by mass. The PC/PBT alloy material with the low dielectric constant is obtained by selecting a proper low-dielectric-constant filler and adding minerals, a compatilizer, a lubricant and an antioxidant, and has the advantages of balanced rigidity and toughness, good appearance, dimensional stability and the like. The PC/PBT alloy material injection molding sample piece with the low dielectric constant, prepared by the invention, has the advantages of low dielectric constant, balanced rigidity and toughness, good size stability and excellent appearance, and is suitable for antenna protection and packaging.
Description
Technical Field
The invention relates to the field of material science, in particular to a low-dielectric-constant PC/PBT alloy material and a preparation method thereof.
Background
PBT (polybutylene terephthalate) is a common semi-crystalline engineering plastic, and has the defects of high strength, solvent resistance, low water absorption, good electrical property, easiness in molding and processing, large shrinkage rate, insufficient notch impact strength and the like of a PBT material. PC (polycarbonate) is amorphous engineering plastic, has high impact, wide application temperature range, free dyeing property, low forming shrinkage and good dimensional stability, but PC material has poor wear resistance and solvent resistance. The PC/PBT combines the advantages of the PC/PBT alloy and the PBT, avoids the disadvantages of the PC/PBT alloy, and obtains the low-dielectric-constant PC/PBT alloy material by adding the low-dielectric-constant filler and other fillers and compounding corresponding auxiliaries.
Disclosure of Invention
The invention provides a low-dielectric-constant PC/PBT alloy material and a preparation method thereof, the low-dielectric-constant PC/PBT alloy material has excellent mechanical properties, solvent resistance, particularly excellent flame retardant property and electrical properties, and the material is easy to produce and process.
The technical scheme adopted by the invention is as follows:
a low-dielectric-constant PC/PBT alloy material is composed of the following components in percentage by mass:
PC 20％-70％
PBT 20％-70％
0 to 20 percent of low dielectric constant filler
0 to 20 percent of mineral
1 to 5 percent of compatilizer
0 to 2 percent of foaming agent
0.3 to 3 percent of lubricant
0.1 to 1 percent of antioxidant
The melting index of the PC of the low-dielectric-constant PC/PBT alloy material is 6-30g/10 min.
The viscosity of the PBT of the PC/PBT alloy material with the low dielectric constant is 0.8-1.3cm3/g。
The low-dielectric-constant filler of the low-dielectric-constant PC/PBT alloy material is superfine Polytetrafluoroethylene (PTFE) powder, and the diameter of the PTFE powder is 2-5 mu m.
The mineral of the low-dielectric constant PC/PBT alloy material is one or a compound of more than two of glass fiber, talcum powder, calcium carbonate, wollastonite and mica. The glass fiber is alkali-free glass fiber, the fiber diameter of the glass fiber is 5-20 μm, and the length of the glass fiber is 1.5-6 mm; the chopped glass fiber with the fiber diameter of 7-13 μm and the glass fiber length of 3-4.5 mm is preferred. The particle diameters of the talc, calcium carbonate, wollastonite and mica are 2 μm to 20 μm, preferably 5 μm to 10 μm.
The compatilizer of the low-dielectric-constant PC/PBT alloy material is ethylene-butyl acrylate-glycidyl methacrylate copolymer (PTW), ethylene-ethyl acrylate copolymer (EEA) and glycidyl acrylate grafted ethylene octyl elastomer (GMA-POE), and preferably PTW.
The foaming agent of the low-dielectric constant PC/PBT alloy material is a carbonate polymer.
The lubricant of the low-dielectric constant PC/PBT alloy material is one or a compound of more than two of pentaerythritol stearate (PETS), modified ethylene bisstearamide (TAF) introduced with polar groups and silicone.
The antioxidant of the PC/PBT alloy material with the low dielectric constant is a mixture of hindered phenol antioxidant and phosphite antioxidant, and preferably the antioxidant 1076 and the antioxidant 168 are compounded.
The preparation method of the low-dielectric-constant PC/PBT alloy material comprises the following steps:
drying treatment of raw materials: and (3) placing the PC and PBT raw materials in a drying oven at 100 ℃ for drying for 2-4 h.
Accurately weighing PC, PBT, low-dielectric-constant filler, compatilizer, lubricant and antioxidant, drying, fully mixing, pouring into a main feeding system of a double-screw extruder with a scale, adding minerals through a side feeding system with the scale, setting a good proportion, performing melt extrusion granulation through the double-screw extruder, and uniformly mixing the manufactured particles and foaming agent in a mixing pot according to a certain ratio.
The process parameters of the extruder comprise 190 ℃ in the feeding section and 230 ℃ in the compression section and 240 ℃ in the compression section, 210 ℃ in the metering section and 230 ℃ in the head and 350 ℃ in the screw rotating speed and 450r/min in the screw rotating speed.
And (3) low mixing machine process parameters, wherein the mixing speed is 80r/min, and the mixing time is 3min-8 min.
The invention has the beneficial effects that:
the invention provides a low-dielectric-constant PC/PBT alloy material which has excellent mechanical properties, such as advantages of balanced rigidity and toughness, good appearance, dimensional stability and the like, is solvent-resistant, particularly has excellent electrical properties and a lower dielectric constant, is easy to produce and process, and can be used in the fields of various antennas requiring plastic packaging.
Detailed Description
The invention will now be further described with reference to the following examples, which are intended to illustrate, but not limit the invention.
Drying treatment of raw materials: and (3) placing the PC and PBT raw materials in a drying oven at 100 ℃ for drying for 2-4 h.
Accurately weighing PC, PBT, low-dielectric-constant filler, compatilizer, lubricant and antioxidant, drying, fully mixing, pouring into a main feeding system of a double-screw extruder with a weigher, adding minerals through a side feeding system with the weigher, setting a good proportion, performing melt extrusion granulation through the double-screw extruder, and uniformly mixing the manufactured particles and foaming agent in a mixing pot according to a certain ratio.
The process parameters of the extruder comprise 190 ℃ in the feeding section and 230 ℃ in the compression section and 240 ℃ in the compression section, 210 ℃ in the metering section and 230 ℃ in the head and 350 ℃ in the screw rotating speed and 450r/min in the screw rotating speed.
And (3) low mixing machine process parameters, wherein the mixing speed is 80r/min, and the mixing time is 3min-8 min.
Example 1
A low-dielectric-constant PC/PBT alloy material comprises the following raw material components in percentage by weight:
PC 20％
PBT 78.6％
0% of low-dielectric-constant filler
Mineral content 0%
1 percent of compatilizer
0 percent of foaming agent
0.3 percent of lubricant
0.1 percent of antioxidant
Wherein the melt index of PC is 6g/10min, and the viscosity of PBT resin is 1.3cm3The low dielectric constant filler is superfine PTFE powder with the diameter of 3 mu m, the mineral is talcum powder with the mesh number of 8000 meshes, the compatilizer is PTW, the lubricant is PETS, and the mixture ratio of the antioxidant 1076 to the antioxidant 168 is 1: 2.
Example 2
A low-dielectric-constant PC/PBT alloy material comprises the following raw material components in percentage by weight:
PC 20％
PBT 70％
3.4 percent of low dielectric constant filler
Mineral 5%
1 percent of compatilizer
0 percent of foaming agent
0.3 percent of lubricant
0.3 percent of antioxidant
Wherein the melt index of PC is 6g/10min, and the viscosity of PBT resin is 1.3cm3The low dielectric constant filler is superfine PTFE powder with the diameter of 3 mu m, the mineral is talcum powder with the mesh number of 8000 meshes, the compatilizer is PTW, the lubricant is PETS, and the mixture ratio of the antioxidant 1076 to the antioxidant 168 is 1: 2.
Example 3
A low-dielectric-constant PC/PBT alloy material comprises the following raw material components in percentage by weight:
PC 70％
PBT 20％
3.4 percent of low dielectric constant filler
Mineral 5%
1 percent of compatilizer
0 percent of foaming agent
0.3 percent of lubricant
0.3 percent of antioxidant
Wherein the melt index of PC is 20g/10min, and the viscosity of PBT resin is 1.0cm3The low dielectric constant filler is ultrafine PTFE powder with the diameter of 5 mu m, the compatilizer is PTW, the lubricant is PETS, and the mixture ratio of the antioxidant 1076 to the antioxidant 168 is 1: 2.
Example 4
A low-dielectric-constant PC/PBT alloy material comprises the following raw material components in percentage by weight:
PC 50％
PBT 35％
low dielectric constant filler 10%
Mineral content 0%
4 percent of compatilizer
0 percent of foaming agent
0.7 percent of lubricant
0.3 percent of antioxidant
Wherein the melt index of PC is 20g/10min, and the viscosity of PBT resin is 1.0cm3The mineral is glass fiber, the fiber diameter is 10 mu m, the compatilizer is PTW, the lubricant is PETS, and the mixture ratio of the antioxidant 1076 to the antioxidant 168 is 1: 2.
Example 5
A low-dielectric-constant PC/PBT alloy material comprises the following raw material components in percentage by weight:
PC 41％
PBT 30％
20 percent of low dielectric constant filler
Mineral content 0%
5 percent of compatilizer
0 percent of foaming agent
3 percent of lubricant
1 percent of antioxidant
Wherein the melt index of PC is 10g/10min, and the viscosity of PBT resin is 1.3cm3The compatilizer is PTW, the foaming agent is carbonate polymer, the lubricant is PETS, and the antioxidant is 1076 and 168 mixture in a ratio of 1: 2.
Example 6
A low-dielectric-constant PC/PBT alloy material comprises the following raw material components in percentage by weight:
PC 40％
PBT 35％
low dielectric constant filler 10%
Mineral content 10%
Compatilizer 3%
1.0 percent of foaming agent
0.7 percent of lubricant
0.3 percent of antioxidant
Wherein the melt index of PC is 10g/10min, and the viscosity of PBT resin is 1.3cm3The compatilizer is PTW, the foaming agent is carbonate polymer, the lubricant is PETS, and the antioxidant is 1076 and 168 mixture in a ratio of 1: 2.
Example 7
A low-dielectric-constant PC/PBT alloy material comprises the following raw material components in percentage by weight:
PC 30％
PBT 35％
low dielectric constant filler 10%
Mineral 20%
3.0 percent of compatilizer
1.0 percent of foaming agent
0.7 percent of lubricant
0.3 percent of antioxidant
Wherein the melt index of PC is 10g/10min, and the viscosity of PBT resin is 1.3cm3The compatilizer is PTW, the foaming agent is carbonate polymer, the lubricant is PETS, and the antioxidant is 1076 and 168 mixture in a ratio of 1: 2.
Preparation methods used for examples 1 to 7:
accurately weighing PC, PBT, low-dielectric-constant filler, compatilizer, lubricant and antioxidant, drying, fully mixing, pouring into a main feeding system of a double-screw extruder with a weigher, adding minerals through a side feeding system with the weigher, setting a good proportion, performing melt extrusion granulation through the double-screw extruder, and uniformly mixing the manufactured particles and foaming agent in a mixing pot according to a certain ratio.
The process parameters of the extruder comprise 190 ℃ in the feeding section and 230 ℃ in the compression section and 240 ℃ in the compression section, 210 ℃ in the metering section and 230 ℃ in the head and 400r/min in the screw rotation speed.
And (3) low mixing machine process parameters, wherein the mixing speed is 80r/min, and the mixing time is 3min-8 min.
The analysis and test method comprises the following steps:
drying the material in a drying oven at 80 ℃ for 2-4H, then performing injection molding according to national standard to prepare a sample, adjusting the temperature and humidity of 23 ℃ and 50% humidity for 24H, and testing the mechanical property of the sample;
wherein the density is tested according to the GB/T1033 standard method;
the melt index is tested according to the GB/T3682 standard method;
the tensile property is tested according to the GB/T1040 standard method;
the bending property is tested according to the GB/T9341 method;
the notch impact performance is tested according to the GB/T1843 standard method;
the dielectric constant is tested according to the IEC 60250 standard method;
the test results of examples 1 to 6 and comparative examples 1 to 2 are shown in Table 1:
TABLE 1 formulations and performance test results for examples 1-7
From the data of examples 1 to 7:
1. the addition of low dielectric constant fillers does have a positive effect on the reduction of the dielectric constant;
2. mineral filling also has a positive effect on the dielectric constant, but at the same time has a negative effect on the physical properties;
3. the material is subjected to micro-foaming by using a foaming agent while mineral is filled to form the physical property of the micro-pore diameter enhanced material, and then the low-dielectric-constant filler is added, so that the physical property is not greatly influenced while the dielectric constant is reduced, and the material has great advantages in cost;
4. in summary, the dielectric constant, physical properties and cost can be balanced by using the formulation of the sixth embodiment.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications and equivalents made within the spirit and scope of the present invention should be included therein.
Claims (10)
1. The PC/PBT alloy material with the low dielectric constant is characterized by comprising the following components in percentage by mass:
PC 20%-70%，
PBT 20%-70%，
0 to 20 percent of low dielectric constant filler,
0 to 20 percent of mineral,
1 to 5 percent of compatilizer,
0 to 2 percent of foaming agent,
0.3 to 3 percent of lubricant,
0.1 to 1 percent of antioxidant.
2. The low dielectric constant PC/PBT alloy material of claim 1, wherein: the melt index of the PC is 6-30g/10 min.
3. The low dielectric constant PC/PBT alloy material of claim 1, wherein: the viscosity of the PBT is 0.8-1.3cm3/g。
4. The low dielectric constant PC/PBT alloy material of claim 1, wherein: the low dielectric constant filler is superfine polytetrafluoroethylene powder.
5. The low dielectric constant PC/PBT alloy material of claim 1, wherein: the mineral is one or more of glass fiber, talcum powder, calcium carbonate, wollastonite and mica.
6. The low dielectric constant PC/PBT alloy material of claim 1, wherein: the compatilizer is one or a compound of more than two of ethylene-butyl acrylate-glycidyl methacrylate copolymer, ethylene-ethyl acrylate copolymer and glycidyl acrylate grafted ethylene octyl elastomer.
7. The low dielectric constant PC/PBT alloy material of claim 1, wherein: the foaming agent is a carbonate polymer.
8. The low dielectric constant PC/PBT alloy material of claim 1, wherein: the lubricant is one or a compound of more than two of pentaerythritol stearate, modified ethylene bisstearamide introduced with polar groups and silicone.
9. The low dielectric constant PC/PBT alloy material of claim 1, wherein: the antioxidant is a mixture of hindered phenol antioxidant and phosphite antioxidant.
10. A method for preparing the low dielectric constant PC/PBT alloy material of any one of claims 1-9, comprising the steps of: accurately weighing PC, PBT, low-dielectric-constant filler, compatilizer, lubricant and antioxidant, drying, fully mixing, pouring into a main feeding system of a double-screw extruder with a scale, adding minerals through a side feeding system with the scale, setting a good proportion, performing melt extrusion granulation through the double-screw extruder, and uniformly mixing the manufactured particles and foaming agent in a mixing pot according to a certain ratio.
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|---|---|---|---|---|
| CN113444352A (en) * | 2021-06-23 | 2021-09-28 | 广东虹勤通讯技术有限公司 | Low dielectric composite material and antenna assembly |
| CN114395236A (en) * | 2021-12-22 | 2022-04-26 | 上海长伟锦磁工程塑料有限公司 | Low-dielectric glass fiber reinforced PC (polycarbonate) foam material and preparation method thereof |
| CN116102866A (en) * | 2022-12-30 | 2023-05-12 | 金发科技股份有限公司 | Voltage-resistant and antistatic PC composition and preparation method and application thereof |
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