CN110894348A - Fiber-reinforced PC/PBT material and application thereof as new energy automobile connector material - Google Patents
Fiber-reinforced PC/PBT material and application thereof as new energy automobile connector material Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
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- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K3/04—Carbon
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Abstract
The invention relates to a fiber reinforced PC/PBT material which comprises the following components in parts by weight: 50-80 parts of polycarbonate; 20-50 parts of polybutylene terephthalate; 2-4 parts of a compatilizer; 0.3-0.5 part of ester exchange inhibitor; 0.6-0.8 part of light stabilizer; 0.3-0.5 part of antioxidant; 0.3-0.4 part of lubricant; 10-20 parts of basalt fibers; 0.25-0.35 parts of carbon nano tubes; wherein the mass ratio of the polycarbonate to the polybutylene terephthalate is 1-4: 1. The invention reasonably designs the composition ratio of PC/PBT, adds the carbon nano tube to promote the crystallization of PBT by using the basalt fiber reinforced composite material, and obtains the fiber reinforced PC/PBT material with high tensile strength, thermal deformation temperature and bending strength.
Description
Technical Field
The invention relates to the technical field of alloy materials, in particular to a fiber reinforced PC/PBT material and application thereof as a new energy automobile connector material.
Background
With the outstanding problems of fossil energy crisis and environmental pollution, energy conservation, green and sustainable development become global development trends. New energy automobiles are produced by fortune, and under a series of national encouragement policies, a large number of new energy automobiles appear in cities such as Shenzhen and the like, and public transportation vehicles such as taxies and the like are replaced by the new energy automobiles. However, the new energy automobile uses a high-capacity lithium battery, the working voltage range of the new energy automobile is increased from 14V of the traditional automobile to 400-600V, the electronic and electrical architecture of the automobile needs to be improved comprehensively, the connector is taken as a key part, the connector is taken as the first place, the high-voltage connector becomes an extremely important component of the new energy automobile, and the new energy automobile is applied to the whole automobile and charging facilities.
The new energy automobile connector is made of materials such as nylon, PPS (polyphenylene sulfide), PC (polycarbonate) and the like, but nylon is prone to moisture absorption, so that size instability and electrical performance reduction are caused, PPS is fragile, and materials are prone to overflowing during molding. The patent CN1063982344A aims at the application field of new energy sources of low-temperature-resistant flame-retardant PC materials prepared by PC modification, but the PC has the defects of high melt viscosity, poor molding processability and the like. The blending modification of PC and PBT overcomes the defects of poor heat resistance, low impact resistance and low notch impact strength of PBT (polybutylene terephthalate), and can make up the defects of chemical resistance and molding processability of PC. Not only has the aging resistance and mechanical property of PC, but also has the chemical resistance and high fluidity of PBT. Therefore, the PC/PBT alloy with excellent performance is widely applied to the field of electronic and electric appliances.
In general, fiber reinforced materials are considered for reinforcing materials, and the reinforcement includes carbon fiber, glass fiber, and basalt fiber, among which the glass fiber is widely used due to low price, for example, CN101469114A discloses a toughened and reinforced PC/PBT composite material, which uses glass fiber for material reinforcement. CN108624006A discloses a preparation method of a high-fluidity glass fiber reinforced flame-retardant PC/PBT alloy material, which mainly aims to improve the fluidity and the flame retardance of a composite material, and a selected reinforcement body is glass fiber. The basalt fiber has the advantages of environmental friendliness, high temperature resistance, mechanical property stronger than that of glass fiber and the like, but few basalt fibers with high cost performance are selected for reinforcing PC/PBT materials. PBT is a semi-crystalline polymer, in the composite material, PC inhibits PBT crystallization, and basalt fiber promotes PBT crystallization, so the composition ratio of the basalt fiber and the PC/PBT can influence the crystallization behavior of the composite material, the fiber addition is excessive, the fiber floating problem can occur, the product appearance problem is caused, the crystallization behavior of the polymer is important for the mechanical property, the high crystallinity often shows higher tensile strength and heat resistance, but the impact strength is reduced.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a fiber reinforced PC/PBT material and application thereof as a new energy automobile connector material. The invention reasonably designs the composition ratio of PC/PBT, takes basalt fiber as a reinforcement, and adds the carbon nano tube to promote the crystallization of PBT, thereby obtaining the fiber reinforced PC/PBT material with high tensile strength, thermal deformation temperature and bending strength.
The technical scheme of the invention is as follows:
the invention relates to a fiber reinforced PC/PBT material, which comprises the following components in parts by weight:
50-80 parts of polycarbonate; 20-50 parts of polybutylene terephthalate; 2-4 parts of a compatilizer; 0.3-0.5 part of ester exchange inhibitor; 0.6-0.8 part of light stabilizer; 0.3-0.5 part of antioxidant; 0.3-0.4 part of lubricant; 10-20 parts of basalt fibers; 0.25-0.35 parts of carbon nanotubes; wherein the mass ratio of the polycarbonate to the polybutylene terephthalate is 1-4: 1.
Preferably, the mass ratio of PC to PBT is 2.5: 1.
Preferably, the fiber reinforced PC/PBT material comprises the following components in parts by weight:
65-75 parts of polycarbonate; 25-35 parts of polybutylene terephthalate; 2.5-3.5 parts of a compatilizer; 0.3 part of ester exchange inhibitor; 0.8 part of light stabilizer; 0.3 part of antioxidant; 0.4 part of a lubricant; 10-15 parts of basalt fibers; 0.3 part of carbon nano tube.
More preferably, the fiber reinforced PC/PBT material comprises the following components in parts by weight:
70 parts of Polycarbonate (PC); 30 parts of polybutylene terephthalate (PBT); 3 parts of a compatilizer; 0.3 part of ester exchange inhibitor; 0.8 part of light stabilizer; 0.3 part of antioxidant; 0.4 part of a lubricant; 10 parts of basalt fibers; 0.3 part of carbon nano tube.
Further, the polycarbonate has a melt index of 8 to 10g/10min (300 ℃/2.16 kg); the melt index of the polybutylene terephthalate is 110-120g/10min (250 ℃/5 kg).
Further, the compatibilizer is an ethylene elastomer containing double functionalization of acrylate and methyl methacrylate. Preferably, the compatilizer is ethylene-methyl acrylate-glycidyl methacrylate terpolymer (E-MA-GMA) which has impact resistance and compatibilization effects, wherein epoxy groups can react with PC or polyester end groups to play a role in inhibiting synergistic ester exchange.
Further, the transesterification inhibitor is selected from anhydrous sodium dihydrogen phosphate and/or sodium dihydrogen phosphate, preferably anhydrous sodium dihydrogen phosphate. The ester exchange reaction is random, which easily causes the performance of the product to be not uniform, the performance is changed due to each heat history, which brings difficulty to the recycling of the product, and in addition, the ester exchange reaction can reduce the relative molecular weight of PBT, thereby reducing the chemical resistance and heat resistance of the product. The anhydrous sodium dihydrogen phosphate ester exchange inhibitor is selected to inhibit the ester exchange reaction in the material and improve the chemical resistance and heat resistance of the composite material.
Further, the light stabilizer is an ultraviolet light absorber, so that the PC is prevented from being catalytically degraded by using the alkaline hindered amine light stabilizer. Preferably, the light stabilizer is selected from UV-234.
Further, the antioxidant is polyphenol antioxidant and phosphite antioxidant. Preferably, the antioxidant is a compound of antioxidant 1076 and antioxidant 168, and the mass ratio is 2: 1.
Further, the lubricant is selected from one or more of cyclobutene terephthalic acid, pentaerythritol stearate and oxidized PE wax. Preferably, the lubricant is cyclobutene terephthalic acid CB-100, the lubricant is a low molecular weight PBT oligomer which is solid at normal temperature, can be melted when heated, has the viscosity close to that of water, can easily permeate the fiber reinforced material, and is polymerized into the PBT polyester by continuing heating.
Furthermore, the basalt fiber is a chopped basalt fiber with the length of 3mm and the diameter of 9-13 μm, and the surface of the basalt fiber is treated by a silane coupling agent, so that the interface bonding of the fiber and the PC/PBT matrix is improved. Basalt fiber is an inorganic non-metallic material with excellent properties. Its advantages are high strength, high anticorrosion nature, and high insulating effect. It is made up by using silicon dioxide, aluminium oxide, calcium oxide, magnesium oxide, iron oxide and titanium dioxide, etc. through a platinum-rhodium alloy wire-drawing bushing plate and drawing. The basalt fiber not only improves the mechanical property of the PC/PBT alloy, but also can obviously improve the heat resistance and the dimensional stability of the composite material.
Furthermore, the carbon nano tube has the outer diameter of 20-30nm, the inner diameter of 5-10nm and the length of 10-30 mu m, has heterogeneous nucleation effect on the semi-crystalline polymer, can induce the molecular chain of the matrix to carry out epitaxial crystallization, and can promote the crystallization of the PBT.
Further, the preparation method of the fiber reinforced PC/PBT material comprises the following steps:
uniformly mixing the dried components in proportion, and then extruding and granulating the obtained mixture in a double-screw extruder, wherein the extrusion temperature of each area of the double-screw extruder is 210-250 ℃, the feeding speed is 300-400rpm, and the screw rotating speed is 400-500 rpm; and cooling to obtain the fiber reinforced PC/PBT material.
The invention also discloses application of the fiber reinforced PC/PBT material as a new energy automobile connector material.
By the scheme, the invention at least has the following advantages:
the invention provides a basalt fiber reinforced PC/PBT composite material which has the mechanical property of PC and the chemical resistance and high flow property of PBT. The basalt fiber is selected for reinforcing modification, and the surface of the composite material can be smooth due to the control of the using amount of the basalt fiber, so that the surface of the material is prevented from being rough due to excessive use of the fiber. When the carbon nano tube is added into the composite material, the PC/PBT composite material has higher tensile strength, bending strength and impact strength. Meanwhile, the PC/PBT composite material has higher melt index, shows better fluidity, meets the requirements of material forming and processing, has high thermal deformation temperature with the load of 1.82MPa, exceeds 110 ℃, and has excellent comprehensive performance.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a preferred embodiment of the present invention and is described in detail below.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Examples 1-5 provide a fiber reinforced PC/PBT composite for a new energy automobile connector, wherein the components and their contents are shown in table 1. In Table 1, the amounts of the components are in parts by weight.
Table 1 composite formulation compositions of examples 1-5
| Formulation of | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| PC | 80 | 70 | 60 | 50 | 70 |
| PBT | 20 | 30 | 40 | 50 | 30 |
| Compatilizer | 3 | 3 | 3 | 3 | 3 |
| Ester interchange inhibitor | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Light stabilizers | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| Antioxidant agent | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Lubricant agent | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Carbon nanotube | 0 | 0 | 0 | 0 | 0.3 |
| Basalt fiber | 10 | 10 | 10 | 10 | 10 |
In Table 1, the compatibilizer is E-MA-GMA. The ester exchange inhibitor is anhydrous sodium dihydrogen phosphate. The surface of the chopped basalt fiber with the basalt fiber length of 3mm and the diameter of 9-13 mu m is treated by a silane coupling agent, so that the interface bonding of the fiber and a PC/PBT matrix is improved. The light stabilizer is UV-234. The antioxidant is a composite antioxidant (the mass ratio of the antioxidant 1076 to the antioxidant 168 is 2: 1). The lubricant is cyclobutene terephthalic acid CB-100.
The preparation method of the fiber reinforced PC/PBT composite material for the new energy automobile connector comprises the following steps:
(1) and (3) drying the materials, wherein the PC is dried in a drying oven at 120 ℃ for 4-6 hours, the PBT is placed at 80 ℃ for drying for 4-6 hours, and the basalt fiber is dried at 80 ℃ for 3 hours. And uniformly mixing the granular materials such as PC, PBT and the like, and uniformly mixing the powder materials such as the antioxidant and the like.
(2) Extruding and granulating by a double screw, wherein the heating temperature of each zone is 210 ℃, 220 ℃, 230 ℃, 240 ℃, 250 ℃, 245 ℃ and 245 ℃. Adding the uniformly mixed granules and powder from a main feeding hopper, and adding the basalt fiber from a side feeding hopper. And regulating and controlling the main feeding speed and the side feeding speed to control the content of the basalt fiber in the composite material.
(2) And (3) extruding and granulating, wherein the extrusion speed is 400rpm, the feeding speed is 280rpm, the vacuum degree is-0.08 MPa, the length-diameter ratio of a screw is 40:1, and drying the granules in a drying oven at 110 ℃ for 4-6 hours to obtain the fiber reinforced PC/PBT composite material.
The obtained fiber reinforced PC/PBT composite material is subjected to injection molding to prepare a required sample strip (the injection molding temperature is 240-.
TABLE 2 test conditions
| Serial number | Inspection item | Test method | Unit of | Remarks for note |
| 1 | Tensile strength | ASTM D638 | MPa | 50mm/min |
| 2 | Melt index | ASTM D1238 | g/10min | 250℃/5kg |
| 3 | Bending strength | ASTM D790 | MPa | 2mm/min |
| 4 | Heat distortion temperature | ASTM D648 | ℃ | Load 1.82MPa |
| 5 | Izod notched impact Strength | ASTM D256 | J/m | 23℃ |
The results of the performance tests on the fiber-reinforced PC/PBT composite materials of examples 1 to 5 are shown in Table 3:
TABLE 3 Performance test results for fiber reinforced PC/PBT composites in examples 1-5
| Formulation of | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Tensile Strength (MPa) | 85.0 | 88.2 | 91.2 | 82.8 | 90.6 |
| Melt index (g/10min) | 23.5 | 29.0 | 45.0 | 59.2 | 28.9 |
| Flexural Strength (MPa) | 135.0 | 136.5 | 137.0 | 132.5 | 137.3 |
| Heat distortion temperature (. degree. C.) | 113.1 | 111.3 | 85.7 | 81.6 | 114.0 |
| Izod notched impact Strength (MPa) | 123.5 | 115.0 | 100.9 | 63.0 | 105.2 |
The above results indicate that the PC/PBT composition ratio is 70/30, and the basalt fiber reinforced composite material containing 0.3 part of carbon nanotubes has high tensile strength, flexural strength and impact strength. The high melt index shows good fluidity, meets the requirements of material forming and processing, has high thermal deformation temperature with the load of 1.82MPa, exceeds 110 ℃, and has excellent comprehensive performance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The fiber-reinforced PC/PBT material is characterized by comprising the following components in parts by weight:
50-80 parts of polycarbonate; 20-50 parts of polybutylene terephthalate; 2-4 parts of a compatilizer; 0.3-0.5 part of ester exchange inhibitor; 0.6-0.8 part of light stabilizer; 0.3-0.5 part of antioxidant; 0.3-0.4 part of lubricant; 10-20 parts of basalt fibers; 0.25-0.35 parts of carbon nano tubes; wherein the mass ratio of the polycarbonate to the polybutylene terephthalate is 1-4: 1.
2. The fiber reinforced PC/PBT material of claim 1, wherein: the melt index of the polycarbonate is 8-10g/10min at 300 ℃ and 2.16kg pressure; the melt index of the polybutylene terephthalate is 110-120g/10min at 250 ℃ and 5kg pressure.
3. The fiber reinforced PC/PBT material of claim 1, wherein: the compatilizer is an ethylene elastomer containing double functionalization of acrylic ester and methyl methacrylate.
4. The fiber reinforced PC/PBT material of claim 1, wherein: the ester exchange inhibitor is selected from anhydrous sodium dihydrogen phosphate or sodium dihydrogen phosphate.
5. The fiber reinforced PC/PBT material of claim 1, wherein: the light stabilizer is an ultraviolet light absorber.
6. The fiber reinforced PC/PBT material of claim 1, wherein: the antioxidant is polyphenol antioxidant and phosphite antioxidant.
7. The fiber reinforced PC/PBT material of claim 1, wherein: the lubricant is one or more of cyclobutene terephthalic acid, pentaerythritol stearate and oxidized PE wax.
8. The fiber reinforced PC/PBT material of claim 1, wherein: the basalt fiber is a chopped basalt fiber with the length of 3mm and the diameter of 9-13 mu m, and the surface of the basalt fiber is treated by a silane coupling agent.
9. The fiber reinforced PC/PBT material of claim 1, wherein the preparation method comprises the following steps:
uniformly mixing the dried components in proportion, and then extruding and granulating the obtained mixture in a double-screw extruder, wherein the extrusion temperature of each area of the double-screw extruder is 210-250 ℃, the feeding speed is 300-400rpm, and the screw rotating speed is 400-500 rpm; and cooling to obtain the fiber reinforced PC/PBT material.
10. Use of a fiber reinforced PC/PBT material according to any one of claims 1-9 as a material for automotive connectors.
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| CN112646329A (en) * | 2020-11-24 | 2021-04-13 | 江苏澳盛复合材料科技有限公司 | Carbon fiber reinforced PBT composite material for laser welding and composite molded body |
| CN115044184A (en) * | 2022-06-23 | 2022-09-13 | 海南大学 | Polyester-like polycarbonate-based basalt fiber reinforced biodegradable composite material and preparation method thereof |
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