CN114196169B - PC/PET composite material and preparation method thereof - Google Patents
PC/PET composite material and preparation method thereof Download PDFInfo
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- CN114196169B CN114196169B CN202111446153.5A CN202111446153A CN114196169B CN 114196169 B CN114196169 B CN 114196169B CN 202111446153 A CN202111446153 A CN 202111446153A CN 114196169 B CN114196169 B CN 114196169B
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- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention belongs to the technical field of composite materials, and provides a PC/PET composite material and a preparation method thereof, wherein the PC/PET composite material comprises the following raw materials in parts by weight: 35-65 parts of PET resin, 5-40 parts of PC resin, 4-40 parts of inorganic functional material, 3-10 parts of toughening agent, 0.2-2 parts of antioxidant, 0.2-2 parts of coupling agent and 0.2-2 parts of dispersing lubricant; wherein the inorganic functional material comprises alpha-alumina whisker and nano needle-shaped wollastonite, and the mass ratio of the alpha-alumina whisker to the nano needle-shaped wollastonite is 1-5: 1. the PC/PET composite material can effectively improve the mechanical strength and the high temperature resistance by adding the inorganic functional materials of alpha-alumina whisker and nano needle-like wollastonite and then matching with other auxiliary agents.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to a PC/PET composite material and a preparation method thereof.
Background
With the improvement of the living standard of people, the requirements on the performance of the material are also higher. Among them, polyethylene terephthalate (PET for short) has the characteristics of good dimensional stability, good insulation, excellent oil resistance and solvent resistance, however, PET materials have the disadvantages of poor heat resistance and low mechanical strength, and limits the application range of PET materials to a certain extent. Polycarbonate (PC for short) is one of five general engineering plastics, which has excellent mechanical strength and thermal stability, but PC has the defects of high melt viscosity, difficult molding and processing, and oil and solvent resistance.
Based on this, in the prior art, it is common to mix PET with PC to make PC/PET composites to ameliorate the above-mentioned drawbacks of PET material alone or PC material. However, the existing PC/PET composite material, such as the preparation method of a transparent PC/PET composite material provided in publication No. CN101570627a, has limited effect of improving the mechanical strength and the high temperature resistance of the PC/PET composite material by adding PC and PET, and the obtained PC/PET composite material is still difficult to adapt to the environment with high temperature and high strength, so that the mechanical strength and the high temperature resistance of the existing PC/PET composite material still need to be further improved to expand the application range thereof.
Disclosure of Invention
One of the purposes of the invention is to provide a PC/PET composite material which has excellent mechanical strength and high temperature resistance.
The second purpose of the invention is to provide a preparation method of PC/PET composite material which has stable preparation process and low production cost and is suitable for mass production, aiming at the defects of the prior art.
Based on the above, the invention discloses a PC/PET composite material, which comprises the following raw materials in parts by weight:
wherein the inorganic functional material comprises alpha-alumina whisker and nano needle-shaped wollastonite, and the mass ratio of the alpha-alumina whisker to the nano needle-shaped wollastonite is 1-5: 1.
preferably, the mass ratio of the alpha-alumina whisker to the nano needle-like wollastonite is 4-5: 1.
further preferably, the mass ratio of the alpha-alumina whisker to the nano needle-like wollastonite is 4:1.
still more preferably, the PC/PET composite material comprises the following raw materials in parts by weight:
the inventor finds that under the condition of keeping good cantilever beam notch impact strength, the content of alpha-alumina whiskers in the PC/PET composite material is properly improved, the tensile strength, the bending modulus and the thermal deformation temperature of the PC/PET composite material can be greatly improved, and on the basis, a small amount of nano needle wollastonite is added, and the tensile strength, the bending modulus and the thermal deformation temperature of the PC/PET composite material can be further improved through the synergistic combination of the nano needle wollastonite and the alpha-alumina whiskers, so that the mechanical strength and the high temperature resistance of the PC/PET composite material can be further effectively improved.
Preferably, the dispersion lubricant is ethylene bis stearamide (namely EBS), and can effectively improve the dispersion performance of the nano needle wollastonite and the alpha-alumina whisker in the PC/PET composite material system, so as to ensure the improvement effect of the nano needle wollastonite and the alpha-alumina whisker on the mechanical strength and the high temperature resistance of the PC/PET composite material.
The invention also discloses a preparation method of the PC/PET composite material, which comprises the following preparation steps:
step S1, mixing nano needle-shaped wollastonite, alpha-alumina whisker and a coupling agent, and uniformly stirring to obtain a first mixed material;
s2, adding an antioxidant, a dispersing lubricant and a toughening agent into the first mixed material, and uniformly stirring to obtain a second mixed material;
step S3, adding PET resin and PC resin into the second mixed material, and uniformly stirring to obtain a third mixed material;
and S4, placing the third mixed material into an extruder for extrusion granulation, and obtaining the PC/PET composite material.
Preferably, in the step S1, the stirring rate of the first mixed material is 320-380 rpm, and the stirring time is 2-5 minutes.
Preferably, in the step S2, the stirring rate of the second mixed material is 450-500 rpm, and the stirring time is 3-8 minutes.
Preferably, in the step S3, the stirring rate of the third mixed material is 450-500 rpm, and the stirring time is 3-8 minutes.
Preferably, in the step S4, the process conditions of the extrusion granulation are as follows:
the temperature of each zone of the extruder is as follows: the temperature of the first area is 195-205 ℃, the temperature of the second area is 245-255 ℃, the temperature of the third area to the fourth area is 255-265 ℃, the temperature of the fifth area to the tenth area is 265-275 ℃, and the temperature of the machine head is 275-285 ℃;
in the extrusion granulation process, the rotating speed of the screw is 185-215 rpm, the feeding rotating speed is 20-50 rpm, the rotating speed of the granulator is 25-40 rpm, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of the water tank is 30-50 ℃.
Compared with the prior art, the invention at least comprises the following beneficial effects:
in the PC/PET composite material, PET resin and PC resin are used as main resin, toughening agent, antioxidant, coupling agent and dispersing wetting agent are used as auxiliary agents, alpha-alumina whisker is used as main inorganic functional material, nano needle wollastonite is used as auxiliary inorganic functional material, the addition amount of the two inorganic functional materials in the PC/PET composite material is strictly controlled through the synergistic effect of the alpha-alumina whisker and the nano needle wollastonite, and under the cooperation of the main resin and various auxiliary agents, the alpha-alumina whisker and the nano needle wollastonite exert the synergistic effect, so that the tensile strength, the bending modulus and the heat distortion temperature of the PC/PET composite material are effectively improved, and the mechanical strength and the high temperature resistance of the PC/PET composite material are further improved. The PC/PET composite material of the invention has tensile strength up to 110Mpa, bending strength up to 151Mpa and thermal deformation temperature up to 160 ℃ under 0.45 MPa.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof.
Example 1
The PC/PET composite material comprises the following raw materials in parts by weight:
the preparation method of the PC/PET composite material comprises the following preparation steps:
step S1, mixing nano needle wollastonite, alpha-alumina whisker and a silane coupling agent, and stirring for 3 minutes at 350 revolutions per minute to obtain a first mixed material.
And S2, adding an antioxidant, a dispersion lubricant and a toughening agent into the first mixed material, and stirring for 5 minutes at 480 rpm to obtain a second mixed material.
And step S3, adding PET resin and PC resin into the second mixed material, and stirring for 5 minutes at 480 revolutions per minute to obtain a third mixed material.
And S4, placing the third mixed material into an extruder for extrusion granulation to obtain the PC/PET composite material.
Wherein, the process conditions of extrusion granulation in the step S4 are as follows:
the temperatures of the various zones of the extruder are as follows: the temperature of the first area is 200 ℃, the temperature of the second area is 250 ℃, the temperatures of the three to four areas are 260 ℃, the temperatures of the five to ten areas are 270 ℃, and the temperature of the machine head is 280 ℃;
in the extrusion granulation process, the rotating speed of a screw is 200 revolutions per minute, the rotating speed of a feeding is 35 revolutions per minute, the rotating speed of a granulator is 30 revolutions per minute, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of a water tank is 40 ℃.
Example 2
The PC/PET composite material comprises the following raw materials in parts by weight:
the preparation method of the PC/PET composite material comprises the following preparation steps:
step S1, mixing nano needle wollastonite, alpha-alumina whisker and a silane coupling agent, and stirring for 2 minutes at 320 revolutions per minute to obtain a first mixed material.
And S2, adding an antioxidant, a dispersion lubricant and a toughening agent into the first mixed material, and stirring for 3 minutes at 450 revolutions per minute to obtain a second mixed material.
And step S3, adding PET resin and PC resin into the second mixed material, and stirring for 3 minutes at 450 r/min to obtain a third mixed material.
And S4, placing the third mixed material into an extruder for extrusion granulation to obtain the PC/PET composite material.
Wherein, the process conditions of extrusion granulation in the step S4 are as follows:
the temperatures of the various zones of the extruder are as follows: the temperature of the first area is 195 ℃, the temperature of the second area is 245 ℃, the temperatures of the third area to the fourth area are 255 ℃, the temperatures of the fifth area to the tenth area are 265 ℃, and the temperature of the machine head is 275 ℃;
in the extrusion granulation process, the rotating speed of the screw is 185 revolutions per minute, the feeding rotating speed is 20 revolutions per minute, the rotating speed of the granulator is 25 revolutions per minute, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of the water tank is 30 ℃.
Example 3
The PC/PET composite material comprises the following raw materials in parts by weight:
the preparation method of the PC/PET composite material comprises the following preparation steps:
step S1, mixing nano needle-shaped wollastonite, alpha-alumina whisker and a silane coupling agent, and stirring for 5 minutes at 380 revolutions per minute to obtain a first mixed material.
And S2, adding an antioxidant, a dispersion lubricant and a toughening agent into the first mixed material, and stirring for 8 minutes at 500 revolutions per minute to obtain a second mixed material.
And S3, adding PET resin and PC resin into the second mixed material, and stirring for 8 minutes at 480 rpm to obtain a third mixed material.
And S4, placing the third mixed material into an extruder for extrusion granulation to obtain the PC/PET composite material.
Wherein, the process conditions of extrusion granulation in the step S4 are as follows:
the temperatures of the various zones of the extruder are as follows: the temperature of the first area is 195 ℃, the temperature of the second area is 245 ℃, the temperatures of the third area to the fourth area are 255 ℃, the temperatures of the fifth area to the tenth area are 265 ℃, and the temperature of the machine head is 275 ℃;
in the extrusion granulation process, the rotating speed of a screw is 190 rpm, the rotating speed of a feeding is 25 rpm, the rotating speed of a granulator is 30 rpm, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of a water tank is 30 ℃.
Example 4
The PC/PET composite material comprises the following raw materials in parts by weight:
the preparation method of the PC/PET composite material comprises the following preparation steps:
step S1, mixing nano needle wollastonite, alpha-alumina whisker and a silane coupling agent, and stirring for 4 minutes at 350 revolutions per minute to obtain a first mixed material.
And S2, adding an antioxidant, a dispersion lubricant and a toughening agent into the first mixed material, and stirring for 5 minutes at 480 rpm to obtain a second mixed material.
And S3, adding PET resin and PC resin into the second mixed material, and stirring for 8 minutes at 500 revolutions per minute to obtain a third mixed material.
And S4, placing the third mixed material into an extruder for extrusion granulation to obtain the PC/PET composite material.
Wherein, the process conditions of extrusion granulation in the step S4 are as follows:
the temperatures of the various zones of the extruder are as follows: the temperature of the first area is 205 ℃, the temperature of the second area is 255 ℃, the temperatures of the three to four areas are 265 ℃, the temperatures of the five to ten areas are 275 ℃, and the temperature of the machine head is 285 ℃;
in the extrusion granulation process, the rotating speed of a screw is 215 revolutions per minute, the rotating speed of a feeding is 50 revolutions per minute, the rotating speed of a granulator is 40 revolutions per minute, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of a water tank is 50 ℃.
Example 5
The PC/PET composite material of this embodiment and the preparation method thereof refer to embodiment 1, and the difference from embodiment 1 is that: 20 parts of alpha-alumina whiskers in the PC/PET composite of example 1 were changed to 10 parts of alpha-alumina whiskers.
Comparative example 1
Reference is made to example 1 for a PC/PET composite material and a method for preparing the same, which differ from example 1 in that: the PC/PET composite material of the comparative example is not added with alpha-alumina whisker and nano needle-like wollastonite.
Comparative example 2
Reference is made to example 1 for a PC/PET composite material and a method for preparing the same, which differ from example 1 in that: the PC/PET composite material of the comparative example is not added with nano needle-like wollastonite.
Comparative example 3
Reference is made to example 5 for a PC/PET composite material and a method for preparing the same, which differs from example 5 in that: the PC/PET composite material of the comparative example is not added with nano needle-like wollastonite.
Performance testing
The PC/PET composites of examples 1 to 5 and comparative examples 1 to 3 were subjected to performance tests, respectively, with the test results shown in tables 1 to 2 below:
TABLE 1
In table 1, the reference standards for each test item are as follows: specific gravity: GB/T1033.1 tensile Strength and elongation at break: GB/T1040.3 flexural Strength and flexural modulus: GB/T9341, notched Izod impact Strength: GB/T1843, heat distortion temperature: GB/T1634.1.
As is clear from Table 1, compared with the PC/PET composite material of comparative example 1, which is not added with alpha-alumina whisker and nano needle wollastonite, the PC/PET composite materials of examples 1 to 5 are effectively improved in tensile strength, bending strength and bending modulus, the mechanical strength is well improved, the heat distortion temperature of the PC/PET composite materials of examples 1 to 5 is also obviously improved, the high temperature resistance is good, and in addition, the PC/PET composite materials of examples 1 to 5 maintain good notched Izod impact strength, and normal use of the PC/PET composite materials can be ensured. Among them, the PC/PET composite material of example 1 was the best in mechanical strength and high temperature resistance.
TABLE 2
As is clear from table 2, the PC/PET composite material of example 1 was significantly improved in tensile strength, flexural modulus and heat distortion temperature by adding more than 10 parts of α -alumina whiskers to the PC/PET composite material of example 5 (which was added with 10 parts of α -alumina whiskers and 5 parts of nano needle-like wollastonite), and it was found that the α -alumina whiskers significantly improved the mechanical strength and high temperature resistance of the PC/PET composite material, and therefore, the α -alumina whisker content in the PC/PET composite material was suitably increased while ensuring good notched impact strength of the cantilever beam.
Compared with comparative example 2 (which is added with 20 parts of alpha-alumina whisker), the PC/PET composite material of example 1 (which is added with 20 parts of alpha-alumina whisker and 5 parts of nano needle wollastonite) is also added with 5 parts of nano needle wollastonite, and the tensile strength, bending modulus and heat deformation temperature of the PC/PET composite material can be further improved through the synergistic combination of the alpha-alumina whisker and the nano needle wollastonite, so that the mechanical strength and high temperature resistance of the PC/PET composite material are further improved. Similarly, the PC/PET composite material of example 5 (which was added with 10 parts of alpha-alumina whisker and 5 parts of nano needle-like wollastonite) was further added with 5 parts of nano needle-like wollastonite, which further improved the tensile strength, flexural modulus and heat distortion temperature of the PC/PET composite material by the synergistic combination of the alpha-alumina whisker and the nano needle-like wollastonite, as compared with comparative example 3 (which was added with 10 parts of alpha-alumina whisker).
On the whole, under the condition of ensuring good notched impact strength of the cantilever beam, the PC/PET composite material can properly increase the content of alpha-alumina whiskers so as to greatly improve the tensile strength, the bending modulus and the heat deformation temperature of the PC/PET composite material, and on the basis, a small amount of nano needle-shaped wollastonite can be added to further improve the tensile strength, the bending modulus and the heat deformation temperature of the PC/PET composite material so as to further improve the mechanical strength and the high temperature resistance of the PC/PET composite material.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
The foregoing has outlined rather broadly the more detailed description of the invention in order that the detailed description of the invention that follows may be better understood, and in order that the present principles and embodiments may be better understood; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (10)
1. The PC/PET composite material is characterized by comprising the following raw materials in parts by weight:
wherein the inorganic functional material comprises alpha-alumina whisker and nano needle-shaped wollastonite, and the mass ratio of the alpha-alumina whisker to the nano needle-shaped wollastonite is 1-5: 1.
2. the PC/PET composite material according to claim 1, wherein the mass ratio of the alpha-alumina whisker to the nano needle-like wollastonite is 4-5: 1.
3. the PC/PET composite material according to claim 2, wherein the mass ratio of α -alumina whiskers to nano-needle wollastonite is 4:1.
4. a PC/PET composite according to claim 3, comprising the following raw materials in parts by weight:
5. a PC/PET composite according to claim 1 wherein the dispersing lubricant is ethylene bis stearamide.
6. A process for the preparation of a PC/PET composite material according to any one of claims 1 to 5, characterized in that it comprises the following preparation steps:
step S1, mixing nano needle-shaped wollastonite, alpha-alumina whisker and a coupling agent, and uniformly stirring to obtain a first mixed material;
s2, adding an antioxidant, a dispersing lubricant and a toughening agent into the first mixed material, and uniformly stirring to obtain a second mixed material;
step S3, adding PET resin and PC resin into the second mixed material, and uniformly stirring to obtain a third mixed material;
and S4, placing the third mixed material into an extruder for extrusion granulation, and obtaining the PC/PET composite material.
7. The method according to claim 6, wherein in the step S1, the stirring rate of the first mixture is 320-380 rpm and the stirring time is 2-5 minutes.
8. The method according to claim 6, wherein in the step S2, the stirring rate of the second mixture is 450-500 rpm and the stirring time is 3-8 minutes.
9. The method according to claim 6, wherein in the step S3, the stirring rate of the third mixture is 450-500 rpm and the stirring time is 3-8 minutes.
10. The method for preparing a PC/PET composite material according to claim 6, wherein in step S4, the extrusion granulation process conditions are as follows:
the temperature of each zone of the extruder is as follows: the temperature of the first area is 195-205 ℃, the temperature of the second area is 245-255 ℃, the temperature of the third area to the fourth area is 255-265 ℃, the temperature of the fifth area to the tenth area is 265-275 ℃, and the temperature of the machine head is 275-285 ℃;
in the extrusion granulation process, the rotating speed of the screw is 185-215 rpm, the feeding rotating speed is 20-50 rpm, the rotating speed of the granulator is 25-40 rpm, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of the water tank is 30-50 ℃.
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| JPH07258426A (en) * | 1994-03-25 | 1995-10-09 | Mitsubishi Gas Chem Co Inc | Molding of high gloss |
| JPH11130948A (en) * | 1997-10-29 | 1999-05-18 | Mitsubishi Chemical Corp | Resin composition |
| CN108148377A (en) * | 2016-12-06 | 2018-06-12 | 青岛绿谷生物科技有限公司 | A kind of modified material and preparation method thereof |
| CN108659476A (en) * | 2018-05-21 | 2018-10-16 | 广州医科大学 | A kind of low-shrinkage 3D printing material and the preparation method and application thereof |
| CN113372651A (en) * | 2021-07-16 | 2021-09-10 | 北海市传创环保科技有限公司 | High-strength and high-toughness polypropylene injection molding material |
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2021
- 2021-11-30 CN CN202111446153.5A patent/CN114196169B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07258426A (en) * | 1994-03-25 | 1995-10-09 | Mitsubishi Gas Chem Co Inc | Molding of high gloss |
| JPH11130948A (en) * | 1997-10-29 | 1999-05-18 | Mitsubishi Chemical Corp | Resin composition |
| CN108148377A (en) * | 2016-12-06 | 2018-06-12 | 青岛绿谷生物科技有限公司 | A kind of modified material and preparation method thereof |
| CN108659476A (en) * | 2018-05-21 | 2018-10-16 | 广州医科大学 | A kind of low-shrinkage 3D printing material and the preparation method and application thereof |
| CN113372651A (en) * | 2021-07-16 | 2021-09-10 | 北海市传创环保科技有限公司 | High-strength and high-toughness polypropylene injection molding material |
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