CN114539725A - PET composite material and preparation method thereof - Google Patents

PET composite material and preparation method thereof Download PDF

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Publication number
CN114539725A
CN114539725A CN202011342360.1A CN202011342360A CN114539725A CN 114539725 A CN114539725 A CN 114539725A CN 202011342360 A CN202011342360 A CN 202011342360A CN 114539725 A CN114539725 A CN 114539725A
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parts
pet composite
composite material
pet
solution
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杨桂生
廖雄兵
姚晨光
邹冲
朱敏
计娉婷
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Hefei Genius New Materials Co Ltd
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Hefei Genius New Materials Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses a PET composite material and a preparation method thereof, wherein the PET composite material is prepared from 80-100 parts of PET, 6-10 parts of friction-resistant filler, 8-12 parts of modified PBO fiber and 0.1-0.5 part of antioxidant according to parts by weight, wherein the friction-resistant filler is modified nano molybdenum diboride, and the modified PBO fiber is PBO-g-GMA. The PET composite material has excellent friction resistance and excellent mechanical property.

Description

PET composite material and preparation method thereof
Technical Field
The invention belongs to the technical field of modification of high polymer materials, and particularly relates to a PET composite material and a preparation method thereof.
Background
Polyethylene terephthalate (PET) is a widely used high molecular polyester resin, and PET has the advantages of good fatigue resistance, good heat resistance, excellent dimensional stability and the like, and in some specific material fields, the requirements on the mechanical property and the friction resistance of PET are high, and the common PET material is difficult to meet the requirements, so that the application of the PET composite material in the specific fields is limited.
Disclosure of Invention
In view of the above, the present invention provides a PET composite material with good friction resistance and a preparation method thereof, in which modified nano molybdenum diboride and modified PBO fiber are added to a PET matrix resin, so that the obtained PET composite material has excellent friction resistance and mechanical properties, so as to solve the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a PET composite material which is prepared from 80-100 parts of PET, 6-10 parts of friction-resistant filler, 8-12 parts of modified PBO fiber and 0.1-0.5 part of antioxidant in parts by weight, wherein the friction-resistant filler is modified nano molybdenum diboride, and the modified PBO fiber is PBO-g-GMA.
Modified nanometer molybdenum diboride and modified PBO fiber are added into a PET resin system, so that the nanometer molybdenum diboride is tightly combined with other components in a PET matrix, and excellent wear resistance is shown; the modified PBO fiber is PBO-g-GMA, the epoxy group is introduced to the surface of the PBO fiber, and the interface bonding effect of the PBO fiber and the PET matrix is improved, so that the mechanical property of PET is provided by substitution, and the obtained PET composite material has a high-performance friction-resistant effect and excellent mechanical property.
It is to be understood that the PET base resin is not particularly limited, and any PET resin conventionally used in the art may be used.
Further, the preparation of the friction-resistant filler comprises the following steps:
adding praseodymium chloride hexahydrate into the first acetone solution, and uniformly stirring to obtain a first solution;
after the first solution, the nanometer molybdenum diboride and the concentrated hydrochloric acid are mixed, wherein the grain size of the nanometer molybdenum diboride is 5-80nm to obtain a second solution, it can be understood that the grain size of the nanometer molybdenum diboride is not particularly limited, and the nanometer molybdenum diboride can be used in the invention;
and (3) placing the second solution in a water bath at 50-70 ℃ for reaction for 4-6h, washing the reaction product with water until the pH value is neutral, carrying out vacuum drying at 80-100 ℃ for 3-5h, and grinding and sieving with a 600-mesh sieve to obtain the friction-resistant filler.
Because the boron ion outer layer of the molybdenum diboride has four electrons, each boron ion is connected with the other three boron ions by covalent sigma bonds, and the redundant electron forms a delocalized large pi bond when Pr is added3+And then, the molybdenum diboride can be chemically bonded with delocalized large pi bonds at high temperature, so that the molybdenum diboride is tightly combined with other components in a PET matrix, and the PET composite material has more excellent wear resistance.
Further, the mass ratio of the praseodymium chloride hexahydrate to the first acetone solution is (50-70): (160-200).
Further, the mass ratio of the nanometer molybdenum diboride, the first solution and the concentrated hydrochloric acid is (20-30): (100-160): (30-40).
Further, the preparation of the modified PBO fiber comprises the following steps:
adding PBO fiber into the second acetone solution, reacting for 4-6h at normal temperature, filtering, washing and drying to obtain the first fiber, wherein the filtering, washing and drying in the step are all conventional means in the field, and can be adjusted according to the specific preparation process as long as the purposes of separation, washing and drying can be realized, and in some preferred embodiments of the invention, the washed product is placed at 60-80 ℃ for vacuum drying for 2-4 h;
adding the first fiber and glycidyl methacrylate into a third acetone solution, carrying out grafting reaction for 10-12h under the irradiation of high-pressure ultraviolet light, filtering, washing and drying to obtain the modified PBO fiber, wherein the steps of filtering, washing, drying and the like are the same as the previous step, and in some embodiments of the invention, the washed product is dried for 4-6h at 50-70 ℃.
Preferably, the mass ratio of the PBO fiber to the second acetone solution is (40-60): (120-160).
Preferably, the mass ratio of the first fiber, the glycidyl methacrylate and the third acetone solution is (30-40): (10-16): (100-160).
The ultraviolet grafting reaction in the preparation of the modified PBO fiber can be realized by irradiation of a high-pressure ultraviolet mercury lamp, and the power range of the ultraviolet grafting reaction is 200-100W; preferably, the high-pressure ultraviolet light is a high-pressure ultraviolet mercury lamp with the power of 500W.
Further, the antioxidant described in the present invention is not particularly limited, and any antioxidant conventionally used in the art may be used in the present invention, and preferred specific examples include, but are not limited to, at least one of antioxidant 168, antioxidant 1010, and antioxidant 1330.
The invention also provides a preparation method of the PET composite material, which comprises the following steps:
fully mixing 80-100 parts of PET, 6-10 parts of friction-resistant filler, 8-12 parts of modified PBO fiber and 0.1-0.5 part of antioxidant according to the parts by weight to obtain a uniform mixed material, wherein the full mixing is not particularly limited, the conventional mechanical mixing mode in the field can be realized, and the rotating speed, the time and the like can be adjusted as required as long as the purpose of uniform mixing can be realized;
and adding the mixed material into a double-screw extruder, and carrying out melting, extrusion and granulation to obtain the PET composite material. The processing parameters of the twin-screw extruder may be adjusted according to the selection of the matrix resin and the auxiliary agent, and therefore, may not be particularly limited, and in some embodiments of the present invention, the twin-screw extruder comprises six temperature zones arranged in sequence: the temperature of the first zone is 240-260 ℃, the temperature of the second zone is 280-300 ℃, the temperature of the third zone is 280-300 ℃, the temperature of the fourth zone is 280-300 ℃, the temperature of the fifth zone is 280-300 ℃, the temperature of the sixth zone is 280-300 ℃, the temperature of the head is 280-300 ℃ and the rotation speed of the screw is 200-280 r/min.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the modified nanometer molybdenum diboride is added into the PET matrix, so that the PET composite material has excellent friction resistance. Furthermore, the modified PBO fiber is added into the PET matrix, because one end of GMA is a methyl-substituted ethylene group and the other end is an epoxy group, under the condition of ultraviolet illumination, double bonds form active free radicals, so that graft polymerization reaction is carried out, PBO-g-GMA is obtained, the epoxy group is introduced into the surface of the PBO fiber, the interface combination effect of the PBO fiber and the PET matrix is improved, and the mechanical property of PET is improved.
The PET composite material has high-performance friction-resistant effect and excellent mechanical property.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
It should be noted that the types and suppliers of the reagents used in the following examples and comparative examples are only for the purpose of illustrating the sources and components of the reagents used in the experiments of the present invention, so as to fully disclose the reagents, and do not indicate that the present invention cannot be realized by using other reagents of the same type or other reagents supplied by other suppliers. Unless otherwise specified, "parts" described in the following examples and comparative examples refer to parts by weight.
PET (model 008L), Aclo, canada;
PrCl3·6H2o, Hubeixin Hongli chemical Co., Ltd;
acetone solution, wuhan camboddar chemical ltd;
nano molybdenum diboride, shanghai longjin metal materials ltd;
PBO fiber, delrin fiber technologies ltd;
concentrated hydrochloric acid, hong xing chemical company, even in hong Kong;
GMA, Jinan Kai chemical Co., Ltd;
antioxidants (type Irganox168, Irganox1010, Irganox1330), from Bassfer.
Example 1
Providing friction-resistant filler modified nanometer molybdenum diboride: 500g of praseodymium chloride hexahydrate (PrCl) is weighed3·6H2O) and 1.6kg of acetone solution are put into a reaction vessel to obtain a first solution;
adding 200g of nano molybdenum diboride and 1.0kg of the first solution into a beaker filled with 300g of concentrated hydrochloric acid, placing the beaker into a water bath kettle at 50 ℃, reacting for 4 hours, then washing the surface of the product with deionized water until the pH value is neutral, filtering and washing, placing the product into a vacuum drying oven at 80 ℃ for drying for 3 hours, crushing and grinding the product, and sieving the product with a 600-mesh sieve to obtain the friction-resistant filler.
Providing a modified PBO fiber PBO-g-GMA: weighing 400g of PBO fiber and 1.2kg of acetone solution, putting the PBO fiber and the acetone solution into a reaction vessel, reacting for 4 hours at normal temperature, filtering, washing, and drying in a vacuum drying oven at 60 ℃ for 2 hours to obtain first fiber;
weighing 300g of first fiber, 100g of Glycidyl Methacrylate (GMA) and 1.0kg of acetone solution in a reaction vessel, placing the reaction vessel in a high-pressure ultraviolet mercury lamp environment with the power of 500W, carrying out ultraviolet light initiated grafting reaction for 10h, filtering, washing, and placing in a vacuum drying oven at 50 ℃ for drying for 4h to obtain the modified PBO fiber.
Preparing a PET composite material: weighing 80 parts of PET, 6 parts of friction-resistant filler, 8 parts of modified PBO fiber and 0.1 part of Irganox1010, mixing and uniformly stirring to obtain a mixture;
adding the mixture into a double-screw extruder, and extruding and granulating to obtain the PET composite material, wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the first zone temperature is 240 ℃, the second zone temperature is 280 ℃, the third zone temperature is 280 ℃, the fourth zone temperature is 280 ℃, the fifth zone temperature is 280 ℃, the sixth zone temperature is 280 ℃, the head temperature is 280 ℃ and the screw rotation speed is 200 r/min.
Example 2
Modified nano diboron for providing friction-resistant fillerMolybdenum melting: weighing 700g of praseodymium chloride hexahydrate (PrCl)3·6H2O) and 2.0kg of acetone solution are put into a reaction vessel to obtain a first solution;
adding 300g of nano molybdenum diboride and 1.6kg of the first solution into a beaker containing 400g of concentrated hydrochloric acid, placing the beaker into a 70 ℃ water bath kettle, reacting for 6h, then washing the surface of the product with deionized water until the pH value is neutral, filtering and washing, placing the product into a 100 ℃ vacuum drying oven for drying for 5h, crushing and grinding the product, and sieving the product with a 600-mesh sieve to obtain the friction-resistant filler.
Providing a modified PBO fiber PBO-g-GMA: weighing 600g of PBO fiber and 1.6kg of acetone solution, putting the PBO fiber and the acetone solution into a reaction vessel, reacting for 6 hours at normal temperature, filtering, washing, and drying for 4 hours in a vacuum drying oven at 80 ℃ to obtain first fiber;
weighing 400g of first fiber, 160g of Glycidyl Methacrylate (GMA) and 1.6kg of acetone solution in a reaction vessel, placing the reaction vessel in a high-pressure ultraviolet mercury lamp environment with the power of 500W, carrying out ultraviolet light initiated grafting reaction for 12h, filtering, washing, and placing in a vacuum drying oven at 70 ℃ for drying for 6h to obtain the modified PBO fiber.
Preparing a PET composite material: weighing 100 parts of PET, 10 parts of friction-resistant filler, 12 parts of modified PBO fiber, 0.1 part of Irganox1010, 0.2 part of Irganox168 and 0.2 part of Irganox1330, mixing and uniformly stirring to obtain a mixture;
adding the mixture into a double-screw extruder, and extruding and granulating to obtain the PET composite material, wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the first zone temperature is 260 ℃, the second zone temperature is 300 ℃, the third zone temperature is 300 ℃, the fourth zone temperature is 300 ℃, the fifth zone temperature is 300 ℃, the sixth zone temperature is 300 ℃, the head temperature is 300 ℃ and the screw rotation speed is 280 r/min.
Example 3
Providing friction-resistant filler modified nanometer molybdenum diboride: weighing 600g of praseodymium chloride hexahydrate (PrCl)3·6H2O) and 1.8kg of acetone solution are put into a reaction vessel to obtain a first solution;
adding 250g of nano molybdenum diboride and 1.3kg of the first solution into a beaker filled with 350g of concentrated hydrochloric acid, placing the beaker in a water bath kettle at 60 ℃, reacting for 5 hours, then washing the surface of the product with deionized water until the pH value is neutral, filtering and washing, placing the product in a vacuum drying oven at 90 ℃ for drying for 4 hours, crushing and grinding the product, and sieving the product with a 600-mesh sieve to obtain the friction-resistant filler.
Providing a modified PBO fiber PBO-g-GMA: weighing 500g of PBO fiber and 1.4kg of acetone solution, putting the PBO fiber and the acetone solution into a reaction vessel, reacting for 5 hours at normal temperature, filtering, washing, and drying in a vacuum drying oven at 70 ℃ for 3 hours to obtain first fiber;
350g of first fiber, 130g of Glycidyl Methacrylate (GMA) and 1.3kg of acetone solution are weighed into a reaction vessel, the reaction vessel is placed in a high-pressure ultraviolet mercury lamp environment with the power of 500W to carry out ultraviolet light initiated grafting reaction for 11h, and the reaction vessel is filtered, washed and placed in a vacuum drying oven at the temperature of 60 ℃ to be dried for 5h to obtain the modified PBO fiber.
Preparing a PET composite material: weighing 90 parts of PET, 8 parts of friction-resistant filler, 10 parts of modified PBO fiber, 0.1 part of Irganox168 and 0.2 part of Irganox1010, mixing and uniformly stirring to obtain a mixture;
adding the mixture into a double-screw extruder, and extruding and granulating to obtain the PET composite material, wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the first zone temperature is 250 ℃, the second zone temperature is 290 ℃, the third zone temperature is 290 ℃, the fourth zone temperature is 290 ℃, the fifth zone temperature is 290 ℃, the sixth zone temperature is 290 ℃, the head temperature is 290 ℃, and the screw rotation speed is 240 r/min.
Example 4
Providing a friction-resistant filler modified nano molybdenum diboride: 580g of praseodymium chloride hexahydrate (PrCl) is weighed3·6H2O) and 1.9kg of acetone solution are put into a reaction vessel to obtain a first solution;
adding 260g of nano molybdenum diboride and 1.4kg of the first solution into a beaker filled with 380g of concentrated hydrochloric acid, placing the beaker into a water bath kettle at 55 ℃, reacting for 5 hours, then washing the surface of the product with deionized water until the pH value is neutral, filtering and washing, placing the product into a vacuum drying oven at 95 ℃ for drying for 4 hours, crushing and grinding the product, and sieving the product with a 600-mesh sieve to obtain the friction-resistant filler.
Providing a modified PBO fiber PBO-g-GMA: weighing 480g of PBO fiber and 1.5kg of acetone solution, putting the PBO fiber and the acetone solution into a reaction vessel, reacting for 6 hours at normal temperature, filtering, washing, and drying in a vacuum drying oven at 65 ℃ for 2 hours to obtain first fiber;
380g of first fiber, 150g of Glycidyl Methacrylate (GMA) and 1.4kg of acetone solution are weighed into a reaction vessel, the reaction vessel is placed in a high-pressure ultraviolet mercury lamp environment with the power of 500W to carry out ultraviolet light initiated grafting reaction for 12h, and the reaction vessel is filtered, washed and placed in a vacuum drying oven at the temperature of 65 ℃ to be dried for 6h, so that the modified PBO fiber is obtained.
Preparing a PET composite material: weighing 85 parts of PET, 9 parts of friction-resistant filler, 11 parts of modified PBO fiber, 0.1 part of Irganox1010 and 0.2 part of Irganox1330, mixing and uniformly stirring to obtain a mixture;
adding the mixture into a double-screw extruder, and extruding and granulating to obtain the PET composite material, wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the temperature of the first zone is 245 ℃, the temperature of the second zone is 285 ℃, the temperature of the third zone is 285 ℃, the temperature of the fourth zone is 285 ℃, the temperature of the fifth zone is 285 ℃, the temperature of the sixth zone is 285 ℃, the temperature of a machine head is 285 ℃, and the rotating speed of a screw is 255 r/min.
Example 5
Providing friction-resistant filler modified nanometer molybdenum diboride: weighing 650g of praseodymium chloride hexahydrate (PrCl)3·6H2O) and 1.7kg of acetone solution are put into a reaction vessel to obtain a first solution;
adding 290g of nano molybdenum diboride and 1.1kg of the first solution into a beaker filled with 380g of concentrated hydrochloric acid, placing the beaker into a water bath kettle at 55 ℃, reacting for 5 hours, then washing the surface of the product with deionized water until the pH value is neutral, filtering and washing, placing the product into a vacuum drying oven at 95 ℃ for drying for 5 hours, crushing and grinding the product, and sieving the product with a 600-mesh sieve to obtain the friction-resistant filler.
Providing a modified PBO fiber PBO-g-GMA: weighing 480g of PBO fiber and 1.5kg of acetone solution, putting the PBO fiber and the acetone solution into a reaction vessel, reacting for 6 hours at normal temperature, filtering, washing, and drying in a vacuum drying oven at 65 ℃ for 3 hours to obtain first fiber;
weighing 340g of first fiber, 150g of Glycidyl Methacrylate (GMA) and 1.2kg of acetone solution in a reaction vessel, placing the reaction vessel in a high-pressure ultraviolet mercury lamp environment with the power of 500W, carrying out ultraviolet light initiated grafting reaction for 12h, filtering, washing, and placing in a vacuum drying oven at 65 ℃ for drying for 6h to obtain the modified PBO fiber.
Preparing a PET composite material: weighing 95 parts of PET, 7 parts of friction-resistant filler, 11 parts of modified PBO fiber, 0.1 part of Irganox1010 and 0.1 part of Irganox168, mixing and uniformly stirring to obtain a mixture;
adding the mixture into a double-screw extruder, and extruding and granulating to obtain the PET composite material, wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the temperature of the first zone is 250 ℃, the temperature of the second zone is 295 ℃, the temperature of the third zone is 295 ℃, the temperature of the fourth zone is 295 ℃, the temperature of the fifth zone is 295 ℃, the temperature of the sixth zone is 295 ℃, the temperature of the machine head is 295 ℃, and the rotating speed of the screw is 270 r/min.
Comparative example 1
Weighing 100 parts of PET, 0.1 part of Irganox1010 and 0.2 part of Irganox168, mixing and uniformly stirring to obtain a mixture;
adding the mixture into a double-screw extruder, and extruding and granulating to obtain the PET composite material, wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the temperature of the first zone is 250 ℃, the temperature of the second zone is 295 ℃, the temperature of the third zone is 295 ℃, the temperature of the fourth zone is 295 ℃, the temperature of the fifth zone is 295 ℃, the temperature of the sixth zone is 295 ℃, the temperature of the machine head is 295 ℃, and the rotating speed of the screw is 270 r/min.
Comparative example 2
Weighing 100 parts of PET, 11 parts of PBO fiber, 0.1 part of Irganox1010 and 0.2 part of Irganox168, mixing and uniformly stirring to obtain a mixture;
adding the mixture into a double-screw extruder, and extruding and granulating to obtain the PET composite material, wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the temperature of the first zone is 250 ℃, the temperature of the second zone is 295 ℃, the temperature of the third zone is 295 ℃, the temperature of the fourth zone is 295 ℃, the temperature of the fifth zone is 295 ℃, the temperature of the sixth zone is 295 ℃, the temperature of the machine head is 295 ℃ and the rotating speed of the screw is 270 r/min.
Comparative example 3
Compared with the example 5, in the preparation process of the PET composite material, 7 parts of the friction-resistant filler is replaced by 7 parts of unmodified nanometer molybdenum diboride, and the rest is the same as that of the example 5, so that the PET composite material is obtained.
Comparative example 4
Compared with example 5, in the preparation process of the PET composite material, 11 parts of modified PBO fiber is replaced by 7 parts of unmodified PBO fiber, and the rest is the same as that of example 5, so that the PET composite material is obtained.
The PET composite materials of examples 1 to 5 and comparative examples 1 to 4 were molded into test specimens using an injection molding machine, and the test results are shown in Table 1:
TABLE 1 results of performance test of PET composite materials in examples and comparative examples
Figure BDA0002798899760000071
Note: in Table 1, the tensile specimens used were of type (170.0. + -. 5.0) mmX (13.0. + -. 0.5) mmX (3.2. + -. 0.2) mm and the tensile rate was 50 mm/min;
the cantilever beam notch impact strength sample bars used are of the type: (125.0 + -5.0) mmX (13.0 + -0.5) mmX (3.2 + -0.2) mm, and the notch is machined to have a notch depth (2.6 + -0.2) mm.
As can be seen from the comparison in Table 1, the mechanical properties and the friction resistance of example 1 are superior to those of the comparative example, so that the application field of the PET composite material is greatly expanded, which has very important significance.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The PET composite material is characterized by being prepared from 80-100 parts of PET, 6-10 parts of friction-resistant filler, 8-12 parts of modified PBO fiber and 0.1-0.5 part of antioxidant in parts by weight, wherein the friction-resistant filler is modified nano molybdenum diboride, and the modified PBO fiber is PBO-g-GMA.
2. The PET composite of claim 1, wherein the friction-resistant filler is prepared by the steps of:
adding praseodymium chloride hexahydrate into the first acetone solution, and uniformly stirring to obtain a first solution;
mixing the first solution, the nano molybdenum diboride and concentrated hydrochloric acid to obtain a second solution; the grain size of the nanometer molybdenum diboride is not particularly limited, and the nanometer molybdenum diboride can be used in the invention;
and (3) placing the second solution in a water bath at 50-70 ℃ for reaction for 4-6h, washing the reaction product with water until the pH value is neutral, carrying out vacuum drying at 80-100 ℃ for 3-5h, and grinding and sieving with a 600-mesh sieve to obtain the friction-resistant filler.
3. The PET composite of claim 2, wherein the mass ratio of the praseodymium chloride hexahydrate and the first acetone solution is (50-70): (160-200).
4. The PET composite material according to claim 2, wherein the mass ratio of the nano molybdenum diboride, the first solution and the concentrated hydrochloric acid is (20-30): (100-160): (30-40).
5. The PET composite of claim 1, wherein the preparation of the modified PBO fibers comprises the steps of:
adding PBO fiber into the second acetone solution, reacting for 4-6h at normal temperature, filtering, washing and drying to obtain a first fiber;
and adding the first fiber and glycidyl methacrylate into a third acetone solution, performing grafting reaction for 10-12h under the irradiation of high-pressure ultraviolet light, filtering, washing and drying to obtain the modified PBO fiber.
6. The PET composite material of claim 5 wherein the mass ratio of the PBO fibers to the second diacetone solution is (40-60): (120-160).
7. The PET composite material according to claim 5, wherein the mass ratio of the first fibers, the glycidyl methacrylate and the third acetone solution is (30-40): (10-16): (100-160).
8. The PET composite material according to claim 5 wherein the high-pressure UV light is a high-pressure UV mercury lamp with a power of 500W.
9. The PET composite of claim 1, wherein the antioxidant is at least one selected from the group consisting of antioxidant 168, antioxidant 1010, and antioxidant 1330.
10. A process for the preparation of a PET composite material according to any one of claims 1 to 9, comprising the steps of:
fully mixing 80-100 parts of PET, 6-10 parts of friction-resistant filler, 8-12 parts of modified PBO fiber and 0.1-0.5 part of antioxidant according to parts by weight to obtain a uniform mixed material;
and adding the mixed material into a double-screw extruder, and carrying out melting, extrusion and granulation to obtain the PET composite material.
CN202011342360.1A 2020-11-25 2020-11-25 PET composite material and preparation method thereof Pending CN114539725A (en)

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