CN118027456A - Low-warpage glass fiber reinforced polypropylene material and preparation method thereof - Google Patents
Low-warpage glass fiber reinforced polypropylene material and preparation method thereof Download PDFInfo
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- CN118027456A CN118027456A CN202410206555.5A CN202410206555A CN118027456A CN 118027456 A CN118027456 A CN 118027456A CN 202410206555 A CN202410206555 A CN 202410206555A CN 118027456 A CN118027456 A CN 118027456A
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- 239000003365 glass fiber Substances 0.000 title claims abstract description 80
- -1 polypropylene Polymers 0.000 title claims abstract description 36
- 239000000463 material Substances 0.000 title claims abstract description 35
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 33
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000011159 matrix material Substances 0.000 claims abstract description 7
- 239000003963 antioxidant agent Substances 0.000 claims description 22
- 230000003078 antioxidant effect Effects 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 16
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000000835 fiber Substances 0.000 abstract description 17
- 239000005357 flat glass Substances 0.000 abstract description 7
- 239000010432 diamond Substances 0.000 abstract description 2
- 229910003460 diamond Inorganic materials 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000003513 alkali Substances 0.000 description 4
- 238000005469 granulation Methods 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000006060 molten glass Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229910052903 pyrophyllite Inorganic materials 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- QYHKLBKLFBZGAI-UHFFFAOYSA-N boron magnesium Chemical compound [B].[Mg] QYHKLBKLFBZGAI-UHFFFAOYSA-N 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000010446 mirabilite Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The invention belongs to the technical field of polymer material processing, and particularly relates to a low-warpage glass fiber reinforced polypropylene material and a preparation method thereof. The invention provides a low-warpage glass fiber reinforced polypropylene material, wherein glass fibers are added in a combined manner by a main feed and a side feed, so that the degree of difference of glass fiber orientations of the glass fibers in a polypropylene matrix along a flowing direction and a vertical flowing direction is obviously reduced, and arch warpage generated by the main feed of the glass fibers and diamond warpage generated by the side feed of the glass fibers are mutually offset, so that buckling deformation is improved; and compared with flat glass fiber, the low-warpage glass fiber reinforced polypropylene material has lower cost.
Description
Technical Field
The invention belongs to the technical field of polymer material processing, and particularly relates to a low-warpage glass fiber reinforced polypropylene material and a preparation method thereof.
Background
The glass fiber reinforced polypropylene material is a plastic with high rigidity, light weight, corrosion resistance and high cost performance, and is widely applied to the fields of automobiles, household appliances, electronic appliances and the like. In the field of automobiles, the material is often used for manufacturing various automobile body parts, chassis, engine cover and other parts, and in particular, in the field of automobile bottom guard plate parts, the material has high requirement on low warpage. Since conventional glass fibers are rod-like structures, there is a significant orientation in the material, such that there is a large difference in shrinkage of the material in the flow and perpendicular flow directions, and thus warpage of the material occurs.
Glass fiber is an inorganic nonmetallic material with excellent performance, and has the advantages of good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength, but has the disadvantages of brittle property and poor wear resistance. The yarn is manufactured by taking six ores of pyrophyllite, quartz sand, limestone, dolomite, loam and boron-magnesium stone as raw materials through the processes of high-temperature melting, wire drawing, winding, weaving and the like, the diameter of a monofilament is several micrometers to twenty-several micrometers, which is equivalent to 1/20-1/5 of that of a hair, and each bundle of fiber precursor consists of hundreds or even thousands of monofilaments. Glass fibers are commonly used as reinforcing materials in composite materials, electrical and thermal insulation materials, circuit substrates, and the like.
Glass fibers can be divided into continuous fibers, fixed-length fibers and glass wool according to the form and the length; glass components can be classified into alkali-free, chemical-resistant, high alkali-resistant, medium alkali-resistant, high-strength, high-elastic modulus, alkali-resistant (alkali-resistant) glass fibers and the like.
The main raw materials for producing the glass fiber are as follows: quartz sand, alumina and pyrophyllite, limestone, dolomite, boric acid, soda ash, mirabilite, fluorite, etc. The production methods are roughly classified into two types: one is to directly make molten glass into fibers; one is to make molten glass into glass ball or rod with 20mm diameter, and then heat remelting in several modes to obtain very fine fiber with 3-80 microns diameter. An infinitely long fiber drawn by a mechanical drawing method through a platinum alloy sheet is called a continuous glass fiber, and is commonly called a long fiber. Discontinuous fibers made by rollers or air flow are known as staple fibers and are known as staple fibers.
Aiming at the buckling deformation of glass fiber reinforced polypropylene, the anisotropy caused by glass fibers is reduced by adding flat glass fibers in the prior art, so that the buckling of the glass fiber reinforced polypropylene is improved. However, flat glass fibers have high cost and are difficult to be widely applied in practical production.
Disclosure of Invention
In order to solve the technical problems, the application provides the following technical scheme:
the invention aims to solve the problem of high cost in the prior art, and provides a low-warpage glass fiber reinforced polypropylene material which takes polypropylene as a matrix, and meanwhile, glass fibers are added in a combined manner by a main feed and a side feed, so that the warpage deformation of the glass fibers is improved, and the material cost is further reduced.
The invention provides a preparation method of a low-warpage glass fiber reinforced polypropylene material, which comprises the following steps:
s1: mixing homo-polypropylene, a compatilizer, an antioxidant and a black matrix to obtain a premix A;
s2: mixing the premix A with short glass fibers to obtain a premix B;
S3: adopting a double-screw extruder to melt and extrude the premix B and the round rod-shaped glass fiber to obtain the low-warpage glass fiber reinforced polypropylene material; the premix B enters from a main feeding port of the double-screw extruder, and the round rod-shaped glass fibers enter from a side feeding port of the double-screw extruder.
Preferably, the low-warpage glass fiber reinforced polypropylene material comprises the following raw materials in parts by weight: 50-75 parts of homopolymerized polypropylene resin, 20-40 parts of glass fiber, 0.2-1 part of antioxidant, 3-5 parts of compatilizer and 1-2 parts of black matrix; the glass fibers include short glass fibers and round rod-shaped glass fibers.
Preferably, the melt mass flow rate of the homo-polypropylene is 50-60g/10min at 230 ℃ multiplied by 2.16 kg.
Preferably, in the step S1, the mixing time is 4-6min.
Preferably, in the step S2, the mixing time is 0.5-1.5min.
Preferably, in the step S3, the conditions for melt extrusion in the twin screw extruder are as follows: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃.
Preferably, the screw speed of the side feeding port of the double-screw extruder is 75-125r/min.
Preferably, the length-diameter ratio of the twin-screw extruder is 22-28:1.
Preferably, the mass ratio of the short glass fibers to the round rod-shaped glass fibers is 1-5:1-5.
The invention also provides the low-warpage glass fiber reinforced polypropylene material prepared by the preparation method.
Compared with the prior art, the technical scheme of the invention has the following advantages:
The invention provides a low-warpage glass fiber reinforced polypropylene material, wherein glass fibers are added in a combined manner by a main feed and a side feed, so that the degree of difference of glass fiber orientations of the glass fibers in a polypropylene matrix along a flowing direction and a vertical flowing direction is obviously reduced, and arch warpage generated by the main feed of the glass fibers and diamond warpage generated by the side feed of the glass fibers are mutually offset, so that buckling deformation is improved; and compared with flat glass fiber, the low-warpage glass fiber reinforced polypropylene material has lower cost.
Detailed Description
The present invention will be further described with reference to specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the present invention and practice it.
The melt mass flow rate of the homo-polypropylene 1 at 230 ℃ multiplied by 2.16kg is 56g/10min; the homo-polypropylene 1 was purchased from SK chemical (su state) limited under model 3900;
The melt mass flow rate of the homo-polypropylene 2 at 230 ℃ multiplied by 2.16kg is 12g/10min; the homo-polypropylene 2 was purchased from taiwan plastics industries, inc.
Short glass fibers, commercially available; round rod-shaped glass fibers, commercially available; the model is giant stone ECS10-4.5-568H.
Flat glass fiber, flat ratio 1:3, commercially available;
The compatilizer is maleic anhydride grafted polypropylene, which is purchased from Guangdong Bai Chen new material technology Co., ltd, and the model is PC-1;
The antioxidant comprises a main antioxidant and an auxiliary antioxidant; the main antioxidant is a hindered phenol compound, and is purchased from BASF (BASF) with the model number of 1010; the auxiliary antioxidant is phosphite ester compound, and is purchased from Basiff corporation, and the model is 168; in the conventional adding proportion, the mass ratio of the main antioxidant to the auxiliary antioxidant is 1-3:2-6 (primary antioxidant 0.1-0.3%, secondary antioxidant 0.2-0.6%).
Black stock was purchased from cabot corporation, usa under the model number 2718.
Example 1
The preparation method comprises the steps of pouring 64 parts of homo-polypropylene 1,3 parts of compatilizer, 1.5 parts of antioxidant and 1 part of black masterbatch into a stirrer for 5min, pouring 15 parts of short glass fibers into the stirrer for 1min, uniformly mixing, pouring the mixture into a main feeding scale of a double-screw extruder, and meanwhile, adding 15 parts of round rod-shaped glass fibers from a lateral feeding scale for plasticizing and granulating. The conditions for melt extrusion in a twin screw extruder were: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃. The low-warpage glass fiber reinforced polypropylene material is obtained.
Example 2
The preparation method comprises the steps of pouring 64 parts of homo-polypropylene 1,3 parts of compatilizer, 1.5 parts of antioxidant and 1 part of black masterbatch into a stirrer for 5min, pouring 20 parts of short glass fibers into the stirrer for 1min, uniformly mixing, pouring the mixture into a main feeding scale of a double-screw extruder, and meanwhile adding 10 parts of round rod-shaped glass fibers from a lateral feeding scale for plasticizing and granulating. The conditions for melt extrusion in a twin screw extruder were: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃.
Example 3
The preparation method comprises the steps of pouring 64 parts of homo-polypropylene 1,3 parts of compatilizer, 1.5 parts of antioxidant and 1 part of black masterbatch into a stirrer for 5min, pouring 10 parts of short glass fibers into the stirrer for 1min, uniformly mixing, pouring the mixture into a main feeding scale of a double-screw extruder, and meanwhile, adding 20 parts of round rod-shaped glass fibers from a lateral feeding scale for plasticizing and granulating. The conditions for melt extrusion in a twin screw extruder were: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃.
Example 4
The preparation method comprises the steps of pouring 64 parts of homo-polypropylene 1, 3 parts of compatilizer, 1.5 parts of antioxidant and 1 part of black masterbatch into a stirrer for 5min, pouring 5 parts of glass fiber into the stirrer for 1min, uniformly mixing, pouring the mixture into a main feeding scale of a double-screw extruder, and meanwhile, adding 25 parts of round rod-shaped glass fiber from a lateral feeding scale for plasticizing granulation. The conditions for melt extrusion in a twin screw extruder were: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃.
Example 5
The preparation method comprises the steps of pouring 64 parts of homo-polypropylene 1, 3 parts of compatilizer, 1.5 parts of antioxidant and 1 part of black masterbatch into a stirrer for 5min, pouring 25 parts of glass fiber into the stirrer for 1min, uniformly mixing, pouring the mixture into a main feeding scale of a double-screw extruder, and meanwhile, adding 5 parts of round rod-shaped glass fiber from a lateral feeding scale for plasticizing granulation. The conditions for melt extrusion in a twin screw extruder were: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃.
Example 6
64 Parts of homopolymerized polypropylene 2, 3 parts of compatilizer, 1.5 parts of antioxidant and 1 part of black masterbatch are poured into a stirrer for 5min, then 15 parts of glass fiber is poured into the stirrer for 1min, after being uniformly mixed, the mixture is poured into a main feeding scale of a double-screw extruder, and simultaneously 15 parts of round rod-shaped glass fiber are added from a lateral feeding scale for plasticizing granulation. The conditions for melt extrusion in a twin screw extruder were: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃.
Comparative example 1
Pouring 64 parts of homopolymerized polypropylene 1,3 parts of compatilizer, 1.5 parts of antioxidant and 1 part of black masterbatch into a stirrer for 5min, uniformly mixing, pouring the mixture into a main feeding scale of a double-screw extruder, and simultaneously adding 30 parts of round rod-shaped glass fiber from a lateral feeding scale for plasticizing and granulating, wherein the conditions of melt extrusion of the double-screw extruder are as follows: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃. The low-warpage glass fiber reinforced polypropylene material is obtained.
Comparative example 2
Pouring 64 parts of homopolymerized polypropylene 1, 3 parts of compatilizer, 1.5 parts of antioxidant and 1 part of black masterbatch into a stirrer for 5min, pouring 30 parts of round rod-shaped glass fiber into the stirrer for 1min, uniformly mixing, pouring the mixture into a main feeding scale of a double-screw extruder, plasticizing and granulating. The conditions for melt extrusion in a twin screw extruder were: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃.
Comparative example 3
The preparation method comprises the steps of pouring 64 parts of homo-polypropylene 1,3 parts of compatilizer, 1.5 parts of antioxidant and 1 part of black masterbatch into a stirrer for 5min, uniformly mixing, pouring the mixture into a main feeding scale of a double-screw extruder, and meanwhile adding 30 parts of flat glass fiber into the main feeding scale for plasticizing granulation. The conditions for melt extrusion in a twin screw extruder were: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃.
Effect evaluation 1
The particles prepared in the above examples and comparative examples were subjected to material-level and part-level performance tests, test items and test methods as follows:
tensile properties: the stretching speed was 5mm/min according to ISO 527-2.
Bending properties: the test speed was 2mm/min according to ISO 178.
Notched impact strength: according to ISO 179-1.
Warpage test: the low warp glass fiber reinforced polypropylene materials obtained in examples 1 to 6 and comparative examples 1 to 3 were injection molded into 210mm×140mm×2mm templates, one side of the templates was fixed after warp deformation, and the vertical distance between the highest warp point on the other side and the tabletop was measured, and the smaller the distance indicated that the material was flatter.
Table 1 performance test of each example and comparative example
As can be seen from examples 1 to 5 and comparative examples 1 and 2, the glass fibers are advantageous in reducing warpage of the glass fiber reinforced polypropylene material by adding the main feed and the side feed in combination, and 1:1, the effect of reducing the warpage of the material is optimal. It can be seen from examples 1 and 6 that increasing the melt flow rate of polypropylene is beneficial for reducing the warp deformation of the material. As can be seen from example 1 and comparative example 3, the glass fiber is fed by main and side feeds 1:1 in combination so that the warping deformation of the material is smaller than that of the flat glass fiber.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. The preparation method of the low-warpage glass fiber reinforced polypropylene material is characterized by comprising the following steps of:
s1: mixing homo-polypropylene, a compatilizer, an antioxidant and a black matrix to obtain a premix A;
s2: mixing the premix A with short glass fibers to obtain a premix B;
S3: adopting a double-screw extruder to melt and extrude the premix B and the round rod-shaped glass fiber to obtain the low-warpage glass fiber reinforced polypropylene material; the premix B enters from a main feeding port of the double-screw extruder, and the round rod-shaped glass fibers enter from a side feeding port of the double-screw extruder.
2. The preparation method of claim 1, wherein the low-warpage glass fiber reinforced polypropylene material comprises the following raw materials in parts by weight: 50-75 parts of homopolymerized polypropylene resin, 20-40 parts of glass fiber, 0.2-1 part of antioxidant, 3-5 parts of compatilizer and 1-2 parts of black matrix; the glass fibers include short glass fibers and round rod-shaped glass fibers.
3. The process according to claim 1, wherein the homo-polypropylene has a melt mass flow rate of 50 to 60g/10min at 230 ℃ x 2.16 kg.
4. The method according to claim 1, wherein the mixing time in step S1 is 4 to 6 minutes.
5. The method according to claim 1, wherein the mixing time in the step S2 is 0.5 to 1.5min.
6. The method according to claim 1, wherein in the step S3, the conditions for melt extrusion in the twin screw extruder are as follows: 11 temperature zones are provided, the temperature of the first zone is 80 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 200 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 220 ℃, the temperature of the eighth zone is 220 ℃, the temperature of the ninth zone is 220 ℃, the temperature of the tenth zone is 220 ℃, and the temperature of the eleventh zone is 220 ℃.
7. The method of claim 1, wherein the twin screw extruder has a side feed screw speed of 75-125r/min.
8. The method of claim 1, wherein the twin screw extruder has an aspect ratio of 22 to 28:1.
9. The method according to claim 1, wherein the mass ratio of the short glass fibers to the round rod-shaped glass fibers is 1 to 5:1-5.
10. A low warpage glass fiber reinforced polypropylene material prepared by the preparation method of any one of claims 1 to 9.
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