Green low-carbon glass fiber reinforced polypropylene composite material and preparation method and device thereof

Abstract

The invention provides a green low-carbon glass fiber reinforced polypropylene composite material and a preparation method and device thereof. The composite material comprises a low-carbon polypropylene material, polypropylene resin, glass fibers, an antioxidant, a deodorant, a low-VOC compatilizer and a chain extender. By recycling a low-carbon polypropylene material, reducing carbon emission and adding glass fibers again, a support and skeleton structure is provided for the composite material, so that the strength and rigidity of the composite material are improved; then the odor and VOC of the material are reduced by utilizing the synergistic effect of the deodorant, the low-VOC compatilizer and the chain extender, and meanwhile, the odor and VOC of the composite material are further reduced by using the devolatilization device provided by the invention; the green low-carbon glass fiber reinforced polypropylene composite material prepared by adopting the formula proportion, the preparation method and the device disclosed by the invention has the advantages of excellent mechanical property, excellent thermal aging resistance, longer service life and lower odor, and meets the GRS requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer material processing, and particularly relates to a green and low-carbon glass fiber reinforced polypropylene composite material, a preparation method and a device thereof. Background Art

[0002] The development of low-carbon environmental protection is a main theme of the current stage of development, and the development of low-carbon environmental protection has been incorporated into the general framework of scientific and technological development. In the field of materials, it has become a trend to search for more environmentally friendly and low-carbon materials and production processes. Traditional non-renewable energy sources such as petroleum are decreasing day by day. Affected by the "dual carbon" policy, OEMs such as BMW, Mercedes-Benz, and Audi have put forward the demand for recycled plastics to reduce the carbon emissions of the whole vehicle. Recycled glass fiber reinforced polypropylene composite materials can only be applied to non-structural parts and load-bearing parts in automobiles, as well as exterior parts without odor requirements due to their poor mechanical properties and strong odor, which greatly limits the scope of use of recycled glass fiber reinforced polypropylene composite materials.

[0003] Therefore, how to provide a green and low-carbon glass fiber reinforced polypropylene composite material to make full use of recycled glass fiber reinforced polypropylene composite materials, reduce carbon emissions, and improve the mechanical properties of recycled glass fiber reinforced polypropylene composite materials is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide a green and low-carbon glass fiber reinforced polypropylene composite material, a preparation method and a device thereof to solve at least one of the above technical problems.

[0005] To achieve the above purpose, in the first aspect of the present invention, a green and low-carbon glass fiber reinforced polypropylene composite material is provided, which comprises: a low-carbon polypropylene material, a polypropylene resin, glass fiber, an antioxidant, an odor remover, a low-VOC compatibilizer and a chain extender; the low-carbon polypropylene material is at least one of a glass fiber reinforced polypropylene modified material, a runner material, a parts crushing material and a trimming material; the glass fiber is long glass fiber or short glass fiber surface-treated with a coupling agent; the chain extender contains an epoxy group.

[0006] In the first aspect, the polypropylene resin is polymerized by a hydrogen regulation method, and the polypropylene resin comprises a copolymerized polypropylene resin and a homopolymerized polypropylene resin.

[0007] In a first aspect, the antioxidant includes a primary antioxidant and a secondary antioxidant; the primary antioxidant is at least one of pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine, and octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate; the secondary antioxidant is at least one of tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, or bis(2,4-di-tert-butylphenyl) diphosphite.

[0008] In a first aspect, the deodorant is at least one of an inorganic substance with a porous structure, an organic substance with a porous structure, and an inorganic / organic composite with a porous structure.

[0009] In a first aspect, the low-VOC compatibilizer is at least one of maleic anhydride grafted polypropylene with low VOC, maleic anhydride grafted polyethylene, and maleic anhydride grafted ethylene-octene copolymer.

[0010] In a first aspect, the composite material further includes other additives, and the other additives are a lubricant and a black additive; the lubricant is maleic anhydride grafted polypropylene wax; the black additive is a medium-high pigment ultra-fine carbon black masterbatch with polypropylene or polyethylene as the carrier.

[0011] In a first aspect, the composite material includes, by weight fraction: 20-40% of a low-carbon polypropylene material, 20-50% of a polypropylene resin, 10-30% of glass fiber, 0.3-0.8% of an antioxidant, 0.5-2.0% of a deodorant, 0.5-4% of a low-VOC compatibilizer, 0.2-1.0% of a chain extender, 0.3-0.8% of a lubricant, and 1.0-2.0% of a black additive.

[0012] A second aspect of the present invention provides a device for preparing the green low-carbon glass fiber reinforced polypropylene composite material as described in the first aspect, and the device includes:

[0013] A suction hopper, a first suction motor, an A-tank suction pipe, a first suction stop valve, a double-layer tank A-tank, a first circulation pump, an A-tank circulation pipe, an A-tank heating pipe, an A-tank high-level gauge, an A-tank low-level gauge, a first circulation stop valve, a double-layer tank B-tank, a second circulation pump, a B-tank circulation pipe, a second circulation stop valve, a second suction motor, a B-tank suction pipe, a second suction stop valve, a B-tank high-level gauge, a B-tank low-level gauge, a B-tank heating pipe, an A-C suction pipe, a third suction stop valve, a B-C suction pipe, a fourth suction stop valve, a third suction motor, a single-layer cooling and homogenizing tank C-tank, a C-tank high-level gauge, a C-tank low-level gauge, a third circulation pump, a C-tank circulation pipe, a third circulation stop valve, a discharge valve, and a discharge bucket;

[0014] The material suction hopper is connected to one end of the suction pipe of Tank A, and the other end of the suction pipe of Tank A is connected to the upper end of the double-layer tank of Tank A. The first material suction motor and the first material suction stop valve control the conveyance of materials from the material suction hopper into the double-layer tank of Tank A. The materials, by weight parts, include: 20-40% of low-carbon polypropylene material, 20-50% of polypropylene resin, 10-30% of glass fiber, 0.3-0.8% of antioxidant, 0.5-2.0% of deodorant, 0.5-4% of low-VOC compatibilizer, 0.2-1.0% of chain extender, 0.3-0.8% of lubricant, and 1.0-2.0% of black additive;

[0015] The material suction hopper is connected to one end of the suction pipe of Tank B, and the other end of the suction pipe of Tank B is connected to the upper end of the double-layer tank of Tank B. The second material suction motor and the second material suction stop valve control the conveyance of materials from the material suction hopper into the double-layer tank of Tank B;

[0016] The A-tank heating pipe is arranged in the double-layer tank of Tank A for heating the materials in the double-layer tank of Tank A. The high material level gauge of Tank A is arranged at the upper end of the double-layer tank of Tank A, and the low material level gauge of Tank A is arranged at the lower end of the double-layer tank of Tank A;

[0017] The B-tank heating pipe is arranged in the double-layer tank of Tank B for heating the materials in the double-layer tank of Tank B. The high material level gauge of Tank B is arranged at the upper end of the double-layer tank of Tank B, and the low material level gauge of Tank B is arranged at the lower end of the double-layer tank of Tank B;

[0018] A number of first interfaces are arranged at the lower port of the double-layer tank of Tank A. One end of the circulation pipe of Tank A is connected to one of the first interfaces, and the other end of the circulation pipe of Tank A is connected to the upper port of the double-layer tank of Tank A. The first circulation pump and the first circulation stop valve are arranged on the circulation pipe of Tank A to control the circulation of the materials in the double-layer tank of Tank A within the double-layer tank of Tank A;

[0019] A number of second interfaces are arranged at the lower port of the double-layer tank of Tank B. One end of the circulation pipe of Tank B is connected to one of the second interfaces, and the other end of the circulation pipe of Tank B is connected to the upper port of the double-layer tank of Tank B. The second circulation pump and the second circulation stop valve are arranged on the circulation pipe of Tank B to control the circulation of the materials in the double-layer tank of Tank B within the double-layer tank of Tank B;

[0020] One end of the A-C suction pipe is connected to another one of the first interfaces, and the other end of the A-C suction pipe is connected to one end of the main suction pipe; one end of the B-C suction pipe is connected to another one of the second interfaces, and the other end of the B-C suction pipe is connected to one end of the main suction pipe. The other end of the main suction pipe is connected to the upper port of the single-layer cooling and homogenizing tank C. A third suction stop valve is provided on the A-C suction pipe, a fourth suction stop valve is provided on the B-C suction pipe, and a third suction motor is provided on the main suction pipe for conveying the materials in the double-layer tank A or the materials in the double-layer tank B to the single-layer cooling and homogenizing tank C.

[0021] A high-level meter for tank C is provided at the upper end of the single-layer cooling and homogenizing tank C, and a low-level meter for tank C is provided at the lower end of the single-layer cooling and homogenizing tank C; one end of the C-tank circulation pipe is connected to the lower port of the single-layer cooling and homogenizing tank C, and the other end of the C-tank circulation pipe is connected to the upper port of the single-layer cooling and homogenizing tank C. A third circulation pump and a third circulation stop valve are provided on the C-tank circulation pipe for controlling the circulation of the materials in the single-layer cooling and homogenizing tank C within the single-layer cooling and homogenizing tank C.

[0022] The upper end of the discharge bucket is connected to the lower port of the single-layer cooling and homogenizing tank C, and the materials in the single-layer cooling and homogenizing tank C are conveyed to the discharge bucket through the discharge valve.

[0023] The device further includes: a control component, which includes a PLC host and a control terminal. The control terminal is used to control the PLC host to execute computer instructions; the computer instructions include controlling the opening and closing of the first suction motor, the first suction stop valve, the first circulation pump, the first circulation stop valve, the second circulation pump, the second circulation stop valve, the second suction motor, the second suction stop valve, the third suction stop valve, the fourth suction stop valve, the third suction motor, the third circulation pump, the third circulation stop valve and the discharge valve, and setting the suction time, heating temperature, and circulation heating time in the double-layer tank A, setting the suction time, heating temperature, and circulation heating time in the double-layer tank B, and setting the suction time, cooling and homogenizing time in the single-layer cooling and homogenizing tank C.

[0024] The third aspect of the present invention provides a method for preparing a green and low-carbon glass fiber reinforced polypropylene composite material. Based on the green and low-carbon glass fiber reinforced polypropylene composite material described in the first aspect, the preparation method includes: drying the low-carbon polypropylene material and polypropylene resin, where the drying temperature is 80 - 100 °C and the drying time is 4 - 6 h; pre-mixing the dried low-carbon polypropylene material and polypropylene resin in a high-speed mixer to obtain an initial mixed material; mixing the initial mixed material, antioxidant, deodorant, low-VOC compatibilizer, chain extender and other additives in the high-speed mixer to obtain a secondary mixed material; adding the secondary mixed material from the main feeding port and conveying it into the screw cavity of a twin-screw extruder, adding glass fiber from the side feeding port and conveying it into the screw cavity of the twin-screw extruder, heating and melting, extrusion granulation, and sieving in the screw cavity to obtain composite particles; adding the composite particles into the device described in the second aspect for devolatilization treatment to obtain the green and low-carbon glass fiber reinforced polypropylene composite material.

[0025] In the third aspect, the main machine speed of the twin-screw extruder is 300 - 400 rpm; the temperature for heating and melting is 220 - 240 °C.

[0026] Beneficial effects:

[0027] A green and low-carbon glass fiber reinforced polypropylene composite material provided by the present invention comprises: low-carbon polypropylene material, polypropylene resin, glass fiber, antioxidant, deodorant, low-VOC compatibilizer and chain extender. The low-carbon polypropylene material is a glass fiber reinforced polypropylene recycled plastic, which contains a certain amount of glass fiber itself. After being extruded by a twin-screw extruder, the glass fiber will become disordered, the bonding force between the glass fiber and the resin will become weak, the compatibility will become poor, the anti-aging ability will be reduced, and the strength will be reduced; the viscosity of the polypropylene resin is reduced and the fluidity is improved; the newly added glass fiber can improve the support and skeleton structure of the composite material, and improve the strength and rigidity of the composite material; the low-VOC compatibilizer can improve the compatibility between the glass fiber and the resin; the chain extender can increase the viscosity of the low-carbon polypropylene material, increase the chain segments of polypropylene, increase the molecular weight of polypropylene, and improve the mechanical properties of the material; the compounding of the deodorant, low-VOC compatibilizer and chain extender can synergistically reduce the odor and VOC of the material. At the same time, by using the devolatilization device of the present invention, the odor and VOC of the composite material can be further reduced; in addition, the combination of the primary antioxidant and the secondary antioxidant used in the present invention can effectively inhibit the thermal-oxidative aging degradation of the polypropylene composite material, significantly improve the heat resistance of the polypropylene composite material, delay the degradation and aging process of the polypropylene composite material, and thus extend the service life of the polypropylene composite material. It can be seen that the green and low-carbon glass fiber reinforced polypropylene composite material prepared by using the raw material ratio and device described in the present invention can not only make full use of the recycled glass fiber reinforced polypropylene composite material to reduce carbon emissions, but also has excellent mechanical properties, heat aging resistance and low odor, meeting the GRS requirements. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a flowchart of a preparation method of a green and low-carbon glass fiber reinforced polypropylene composite material in the present application;

[0030] Figure 2 It is a structural schematic diagram of a device in the present application;

[0031] Reference Signs:

[0032] 1. Suction hopper; 2. First suction motor; 3. A-tank suction pipe; 4. First suction stop valve; 5. Double-layer tank A-tank; 6. First circulation pump; 7. A-tank circulation pipe; 8. A-tank heating pipe; 9. A-tank high level gauge; 10. A-tank low level gauge; 11. First circulation stop valve; 12. Double-layer tank B-tank; 13. Second circulation pump; 14. B-tank circulation pipe; 15. Second circulation stop valve; 16. Second suction motor; 17. B-tank suction pipe; 18. Second suction stop valve; 19. B-tank high level gauge; 20. B-tank low level gauge; 21. B-tank heating pipe; 22. A-C suction pipe; 23. Third suction stop valve; 24. B-C suction pipe; 25. Fourth suction stop valve; 26. Third suction motor; 27. Single-layer cooling and homogenizing tank C-tank; 28. C-tank high level gauge; 29. C-tank low level gauge; 30. Third circulation pump; 31. C-tank circulation pipe; 32. Third circulation stop valve; 33. Discharge valve; 34. Discharge bucket. Detailed implementation manners

[0033] The following will specifically elaborate on the present invention in combination with the detailed implementation manners and embodiments, and the advantages and various effects of the present invention will be presented more clearly therefrom. Those skilled in the art should understand that these detailed implementation manners and embodiments are used to illustrate the present invention rather than limit the present invention.

[0034] Throughout the specification, unless otherwise specifically stated, the terms used herein should be understood as having the meanings commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as the general understanding of those skilled in the art to which the present invention belongs. In case of contradiction, this specification shall prevail.

[0035] Unless otherwise specifically stated, various raw materials, reagents, instruments, and equipment used in the present invention can be obtained through market purchases or by existing methods.

[0036] A green and low-carbon glass fiber reinforced polypropylene composite material provided by the present application, the composite material includes: low-carbon polypropylene material, polypropylene resin, glass fiber, antioxidant, odor remover, low-VOC compatibilizer, and chain extender; the low-carbon polypropylene material is at least one of glass fiber reinforced polypropylene modified material, regrind, part crushing material, and trimming; the glass fiber is long glass fiber or short glass fiber surface-treated with a coupling agent; the chain extender contains epoxy groups.

[0037] Specifically, a green and low-carbon glass fiber reinforced polypropylene composite material provided by the present invention includes: a low-carbon polypropylene material, polypropylene resin, glass fiber, antioxidant, deodorant, low-VOC compatibilizer, and chain extender. The low-carbon polypropylene material is a glass fiber reinforced polypropylene recycled plastic, which already contains a certain amount of glass fiber. After being extruded by a twin-screw extruder, the glass fiber becomes disordered, the bonding force between the glass fiber and the resin becomes weak, the compatibility becomes poor, the anti-aging ability decreases, and the strength decreases; the viscosity of the polypropylene resin decreases and the fluidity increases; the newly added glass fiber can improve the support and framework structure of the composite material, and improve the strength and rigidity of the composite material; the low-VOC compatibilizer can improve the compatibility between the glass fiber and the resin; the chain extender can increase the viscosity of the low-carbon polypropylene material, increase the chain segments of polypropylene, increase the molecular weight of polypropylene, and improve the mechanical properties of the material; the compound of the deodorant, low-VOC compatibilizer, and chain extender can synergistically reduce the odor and VOC of the material. At the same time, by using the devolatilization device of the present invention, the odor and VOC of the composite material can be further reduced; in addition, the combination of the primary antioxidant and the secondary antioxidant used in the present invention can effectively inhibit the thermal-oxidative aging degradation of the polypropylene composite material, significantly improve the heat resistance of the polypropylene composite material, delay the degradation and aging process of the polypropylene composite material, and thus extend the service life of the polypropylene composite material. It can be seen that the green and low-carbon glass fiber reinforced polypropylene composite material prepared by using the raw material ratio and device of the present invention can not only make full use of the recycled glass fiber reinforced polypropylene composite material, reduce carbon emissions, but also has excellent mechanical properties, heat aging resistance, and low odor, meeting the GRS requirements.

[0038] In some possible embodiments, the polypropylene resin is polymerized by a hydrogen regulation method, and the polypropylene resin includes a copolymerized polypropylene resin and a homopolymerized polypropylene resin.

[0039] Those skilled in the art can understand that the polypropylene resin is a polypropylene resin polymerized by a hydrogen regulation method on a gas-phase bulk polymerization device (without oxide residues), and has lower VOC compared with the polypropylene resin produced by a degradation method (with oxide residues).

[0040] In some possible embodiments, the antioxidant includes a primary antioxidant and a secondary antioxidant; the primary antioxidant is at least one of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, and octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; the secondary antioxidant is at least one of tris[2,4-di-tert-butylphenyl]phosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite, or bis(2,4-dicumylphenyl)-diphosphite.

[0041] This is because there are active hydrogen atoms in the molecule of the primary antioxidant. Such H atoms are more active than the H atoms in the polymer chain and can combine with the macromolecular chain free radicals R· or ROO· decomposed, thereby destroying the chain growth and playing the role of an antioxidant; the secondary antioxidant acts on the hydroperoxides generated by the decomposition of organic matter to prevent the generation of free radicals, and further prevent the continuous generation of more free radicals, so as to maintain the thermal stability of the organic matter and extend the service life of the organic matter; the effects of light, heat, and oxygen exist in both the early and late stages of processing. The primary antioxidant and the secondary antioxidant act synergistically to delay the thermal oxidation rate of the organic matter during processing and use.

[0042] In some possible embodiments, the deodorant is at least one of an inorganic substance with a porous structure, an organic substance with a porous structure, and an inorganic / organic composite with a porous structure.

[0043] Those skilled in the art can understand that the deodorant is an inorganic substance or an organic substance or an inorganic / organic composite with a porous structure, has a strong adsorption capacity for odors and organic substances, has high heat resistance, and has a good dispersion effect in the polypropylene composite material.

[0044] In some possible embodiments, the low-VOC compatibilizer is at least one of low-VOC maleic anhydride grafted polypropylene, maleic anhydride grafted polyethylene, and maleic anhydride grafted ethylene-octene copolymer.

[0045] This is because the low-VOC compatibilizer is at least one of low-VOC maleic anhydride grafted polypropylene, maleic anhydride grafted polyethylene, and maleic anhydride grafted ethylene-octene copolymer, which improves the compatibility between the resin and the glass fiber and enhances the bonding force between the resin and the glass fiber.

[0046] In some possible embodiments, the composite material further includes other additives; the other additives are a lubricant and a black additive; the lubricant is maleic anhydride grafted polypropylene wax; the black additive is a medium-high pigment ultra-fine carbon black masterbatch with polypropylene or polyethylene as the carrier.

[0047] Those skilled in the art can understand that the lubricant is maleic anhydride grafted polypropylene wax, which has good compatibility with the polypropylene resin and can be well dispersed in the polypropylene resin; the black additive is a medium-high pigment ultra-fine carbon black masterbatch with polypropylene or polyethylene as the carrier, which has good compatibility with the polypropylene resin and can be well dispersed in the polypropylene resin.

[0048] In some possible embodiments, the composite material includes, by weight fraction: 20-40% low carbon polypropylene material, 20-50% polypropylene resin, 10-30% glass fiber, 0.3-0.8% antioxidant, 0.5-2.0% deodorant, 0.5-4% low VOC compatibilizer, 0.2-1.0% chain extender, 0.3-0.8% lubricant and 1.0-2.0% black additive.

[0049] Based on a general inventive concept, the present application also provides a device, see Figure 2 , used to prepare the green low-carbon glass fiber reinforced polypropylene composite material described in the first aspect, the device includes: a suction hopper 1, a first suction motor 2, a tank A suction pipe 3, a first suction stop valve 4, a double-layer tank A tank 5, a first circulation pump 6, a tank A circulation pipe 7, a tank A heating pipe 8, a tank A high level meter 9, a tank A low level meter 10, a first circulation stop valve 11, a double-layer tank B tank 12, a second circulation pump 13, a tank B circulation pipe 14, a second circulation stop valve 15, a second suction motor 16, a tank B circulation pipe 17, a second suction stop valve 18, a second suction motor 19, a tank A suction pipe 20, a tank B suction pipe 21, a tank B suction pipe 22, a tank B suction pipe 23, a tank B suction pipe 24, a tank B suction pipe 25, a tank B suction pipe 26, a tank B suction pipe 27, a tank B suction pipe 28, a tank A suction pipe 29, a tank A suction pipe 30, a tank A suction pipe 31, a tank B suction pipe 32, a tank B suction pipe 33, a tank B suction pipe 34, a tank A suction pipe 35, a tank A suction pipe 36, a tank A suction pipe 37, a tank A suction pipe 38, a tank A suction pipe 39, a tank A suction pipe 40, a tank A suction pipe 41, a tank A suction pipe 42, a tank A suction pipe 43, a tank A suction pipe 44, a tank A suction pipe 45, a tank A suction pipe 46, a tank A suction pipe 47, a tank A suction pipe 48, a tank A suction pipe 49, a tank A suction pipe 50, a tank A suction pipe 51, a tank A suction pipe 52, a tank A suction pipe 53, a tank A suction pipe 54, a tank A suction pipe Machine 16, B tank suction pipe 17, second suction stop valve 18, B tank high material level meter 19, B tank low material level meter 20, B tank heating pipe 21, AC suction pipe 22, third suction stop valve 23, BC suction pipe 24, fourth suction stop valve 25, third suction motor 26, single-layer cooling homogenization tank C tank 27, C tank high material level meter 28, C tank low material level meter 29, third circulation pump 30, C tank circulation pipe 31, third circulation stop valve 32, discharge valve 33, discharge barrel 34;

[0050] The suction hopper 1 is connected to one end of the A tank suction pipe 3, and the other end of the A tank suction pipe 3 is connected to the upper end of the double-layer tank body A tank 5. The first suction motor 2 and the first suction stop valve 4 control the material to be transported from the suction hopper 1 to the double-layer tank body A tank 5; the material includes by weight: 20-40% low-carbon polypropylene material, 20-50% polypropylene resin, 10-30% glass fiber, 0.3-0.8% antioxidant, 0.5-2.0% deodorant, 0.5-4% low VOC compatibilizer, 0.2-1.0% chain extender, 0.3-0.8% lubricant and 1.0-2.0% black additive;

[0051] The suction hopper 1 is connected to one end of the B tank suction pipe 17, and the other end of the B tank suction pipe 17 is connected to the upper end of the double-layer tank body B tank 12. The second suction motor 16 and the second suction stop valve 18 control the material to be transported from the suction hopper 1 to the double-layer tank body B tank 12;

[0052] In the double-layer tank A tank 5, there is an A tank heating pipe 8 for heating the materials in the double-layer tank A tank 5; at the upper end of the double-layer tank A tank 5, there is an A tank high level gauge 9, and at the lower end of the double-layer tank A tank 5, there is an A tank low level gauge 10;

[0053] In the double-layer tank B tank 12, there is a B tank heating pipe 21 for heating the materials in the double-layer tank B tank 12; at the upper end of the double-layer tank B tank 12, there is a B tank high level gauge 19, and at the lower end of the double-layer tank B tank 12, there is a B tank low level gauge 20;

[0054] At the lower port of the double-layer tank A tank 5, there are several first interfaces. One end of the A tank circulation pipe 7 is connected to one of the first interfaces, and the other end of the A tank circulation pipe 7 is connected to the upper port of the double-layer tank A tank 5. The A tank circulation pipe 7 is provided with a first circulation pump 6 and a first circulation stop valve 11 for controlling the circulation of the materials in the double-layer tank A tank 5 within the double-layer tank A tank 5;

[0055] At the lower port of the double-layer tank B tank 12, there are several second interfaces. One end of the B tank circulation pipe 14 is connected to one of the second interfaces, and the other end of the B tank circulation pipe 14 is connected to the upper port of the double-layer tank B tank 12. The B tank circulation pipe 14 is provided with a second circulation pump 13 and a second circulation stop valve 15 for controlling the circulation of the materials in the double-layer tank B tank 12 within the double-layer tank B tank 12;

[0056] One end of the A-C suction pipe 22 is connected to another one of the first interfaces, and the other end of the A-C suction pipe 22 is connected to one end of the total suction pipe; one end of the B-C suction pipe 24 is connected to another one of the second interfaces, and the other end of the B-C suction pipe 24 is connected to one end of the total suction pipe. The other end of the total suction pipe is connected to the upper port of the single-layer cooling and homogenizing tank C tank 27. The A-C suction pipe 22 is provided with a third suction stop valve 23, the B-C suction pipe 24 is provided with a fourth suction stop valve 25, and the total suction pipe is provided with a third suction motor 26 for transporting the materials in the double-layer tank A tank 5 or the materials in the double-layer tank B tank 12 to the single-layer cooling and homogenizing tank C tank 27;

[0057] The upper end of the single-layer cooling and homogenizing tank C tank 27 is provided with the C tank high-level gauge 28, and the lower end of the single-layer cooling and homogenizing tank C tank 27 is provided with the C tank low-level gauge 29; one end of the C tank circulation pipe 31 is connected to the lower port of the single-layer cooling and homogenizing tank C tank 27, and the other end of the C tank circulation pipe 31 is connected to the upper port of the single-layer cooling and homogenizing tank C tank 27. The C tank circulation pipe 31 is provided with the third circulation pump 30 and the third circulation stop valve 32 for controlling the circulation of the materials in the single-layer cooling and homogenizing tank C tank 27 in the single-layer cooling and homogenizing tank C tank 27;

[0058] The upper end of the discharge bucket 34 is connected to the lower port of the single-layer cooling and homogenizing tank C tank 27, and the materials in the single-layer cooling and homogenizing tank C tank 27 are conveyed to the discharge bucket 34 through the discharge valve 33;

[0059] The device further includes: a control component, the control component includes a PLC host and a control terminal, and the control terminal is used to control the PLC host to execute computer instructions; the computer instructions include controlling the first suction motor 2, the first suction stop valve 4, the first circulation pump 6, the first circulation stop valve 11, the second circulation pump 13, the second circulation stop valve 15, the second suction motor 16, the second suction stop valve 18, the third suction stop valve 23, the fourth suction stop valve 25, the third suction motor 26, the third circulation pump 30, the third circulation stop valve 32 and the discharge valve 33 to open and close, and setting the suction time, heating temperature, and circulation heating time in the double-layer tank A tank 5, setting the suction time, heating temperature, and circulation heating time in the double-layer tank B tank 12, and setting the suction time and cooling and homogenizing time in the single-layer cooling and homogenizing tank C tank 27.

[0060] Specifically, the working principle of the device is as follows:

[0061] When the control terminal controls the first material suction motor 2, the first material suction cut-off valve 4, the first circulation pump 6 and the first circulation cut-off valve 11 to open, the A tank material suction pipe 3 sucks materials from the material suction hopper 1 into the double-layer tank A tank 5. While sucking materials from the material suction hopper 1, the double-layer tank A tank 5 also circulates the materials inside. When the materials reach the low material level gauge 10 of the A tank, the control terminal controls the A tank heating pipe 8 to reach the specified temperature to circulate and heat the materials in the double-layer tank A tank 5 for odor removal. When the materials reach the high material level gauge 9 of the A tank, the control terminal controls the first material suction motor 2 and the first material suction cut-off valve 4 to close, stopping the material suction. At the same time, the control terminal controls the circulating heating time of the materials in the double-layer tank A tank 5. After reaching the specified circulating heating time, the control terminal controls the third material suction cut-off valve 23 and the third material suction motor 26 to open, so that the materials in the double-layer tank A tank 5 are transported to the single-layer cooling and homogenizing tank C tank 27 for cooling and homogenizing;

[0062] To improve work efficiency and expand production capacity, when the materials reach the high material level gauge 9 of the A tank, the control terminal controls the second material suction motor 16, the second material suction cut-off valve 18, the second circulation pump 13 and the second circulation cut-off valve to open. The B tank material suction pipe 17 sucks materials from the material suction hopper 1 into the double-layer tank B tank 12. While sucking materials from the material suction hopper 1, the double-layer tank B tank 12 also circulates the materials inside. When the materials reach the low material level gauge 20 of the B tank, the control terminal controls the B tank heating pipe 21 to reach the specified temperature to circulate and heat the materials in the double-layer tank B tank 12 for odor removal. When the materials reach the high material level gauge 19 of the B tank, the control terminal controls the second material suction motor 16 and the second material suction cut-off valve 18 to close, stopping the material suction. At the same time, the control terminal controls the circulating heating time of the materials in the double-layer tank B tank 12. After reaching the specified circulating heating time, the control terminal controls the fourth material suction cut-off valve 25 to open, so that the materials in the double-layer tank B tank 12 are transported to the single-layer cooling and homogenizing tank C tank 27 for cooling and homogenizing;

[0063] When the materials are cooled and homogenized to the specified temperature in the single-layer cooling and homogenizing tank C tank 27, an alarm is triggered to prompt the staff to control the opening of the discharge valve 33 through the control terminal, so that the materials are transported to the discharge bucket 34 for packing.

[0064] The PLC host is composed of a PLC, a touch screen, control components and electrical appliance components.

[0065] Based on a general inventive concept, the present application also provides a preparation method of a green and low-carbon glass fiber reinforced polypropylene composite material. Please refer to Figure 1, based on the green low-carbon glass fiber reinforced polypropylene composite material described in the first aspect, the preparation method comprises:

[0066] S1, drying the low carbon polypropylene material and the polypropylene resin, the drying temperature is 80-100° C., and the drying time is 4-6 hours;

[0067] S2, premixing the dried low-carbon polypropylene material and polypropylene resin in a high-speed mixer to obtain an initial mixed material;

[0068] S3, mixing the initial mixed material, antioxidant, deodorant, low VOC compatibilizer, chain extender and other additives in the high-speed mixer to obtain a secondary mixed material;

[0069] S4, adding the secondary mixed material from the main feeding port and conveying it into the screw cavity of the twin-screw extruder, adding the glass fiber from the side feeding port and conveying it into the screw cavity of the twin-screw extruder, heating and melting in the screw cavity, extruding and granulating, and sieving to obtain composite particles;

[0070] S5. Adding the composite particles into the device as described in the second aspect, performing devolatilization treatment, and obtaining a green low-carbon glass fiber reinforced polypropylene composite material.

[0071] In combination with the third aspect of the present application, the main engine speed of the twin-screw extruder is 300-400 rpm; the heating and melting temperature is 220-240°C.

[0072] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0073] The components of the polypropylene composite materials in Examples 1-3 and Comparative Examples 1-3 are shown in Table 1 below in terms of weight percentage:

[0074] Table 1 Raw material components by weight

[0075] Component / wt% Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Low-carbon polypropylene material 33.5 33.5 33.5 - - - Copolymerized polypropylene resin 39.4 31.4 23.4 50.6 42.6 34.6 Homopolymerized polypropylene resin 9.8 7.8 5.8 12.6 10.6 8.6 Glass fiber 10 20 30 30 40 50 Antioxidant 0.8 0.8 0.8 0.8 0.8 0.8 Deodorant 0.5 0.5 0.5 0.5 0.5 0.5 Low-VOC compatibilizer 4.0 4.0 4.0 4.0 4.0 4.0 Chain extender 0.5 0.5 0.5 - - - Other additives 1.5 1.5 1.5 1.5 1.5 1.5

[0076] According to the preparation method of the polypropylene material mentioned above, the composite material prepared with the formula ratio in Table 1 was tested, and the test results are shown in Table 2:

[0077] Table 2 Test results

[0078]

[0079]

[0080] It should be further noted that: (1) The low-carbon polypropylene materials used in Examples 1-3 are recycled scraps. The original material is 60% reinforced polypropylene material, and the mass ratio of copolymerized polypropylene resin to homopolymerized polypropylene resin is 80:20. (2) The basic conditions to meet the GRS requirements are as follows: after thermal-oxidative aging at 150 °C for 1000 h, the tensile strength retention rate meets >50%, the odor grade meets ≤3.5, and the addition amount of low-carbon polypropylene material is ≥20 wt%.

[0081] As can be seen from the above table: Since the low-carbon polypropylene materials in Examples 1-3 are recycled scraps and themselves contain glass fibers, but after passing through a twin-screw extruder, the glass fibers become disordered and cannot play a role in filling and strengthening the material, and will also reduce the mechanical properties of the material. Therefore, by adding a small amount of glass fibers again to provide support and a skeletal structure for the composite material, and adding a chain extender to increase the chain segments of polypropylene to improve the mechanical properties of the composite material. At the same time, a low-VOC compatibilizer and deodorant are used to reduce the odor of the composite material. And according to the test results of the examples and comparative examples, the fluidity of the composite material prepared by the technical solution of the present application is equivalent to that of the composite material prepared by using brand-new materials in the comparative example, and the mechanical properties of the composite material of the present application can reach more than 80% of the performance of the composite material prepared by using brand-new materials. That is, the present application realizes the reuse of waste materials, reduces carbon emissions, and can also meet the performance requirements of the composite material for the parts of the vehicle factory and meet the GRS requirements.

[0082] Finally, it should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0083] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0084] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A green and low-carbon glass fiber reinforced polypropylene composite material, characterized in that, The composite material includes: low-carbon polypropylene material, polypropylene resin, glass fiber, antioxidant, odor remover, low-VOC compatibilizer, and chain extender; The low-carbon polypropylene material is at least one of glass fiber reinforced polypropylene modified material, regrind, part crushed material, and trim; The glass fiber is long glass fiber or short glass fiber surface-treated with a coupling agent; The chain extender contains an epoxy group.

2. The green and low-carbon glass fiber-reinforced polypropylene composite material according to claim 1, wherein The polypropylene resin is polymerized by a hydrogen regulation method, and the polypropylene resin includes copolymerized polypropylene resin and homopolymerized polypropylene resin.

3. The green and low-carbon glass fiber-reinforced polypropylene composite material according to claim 2, wherein The antioxidant includes a main antioxidant and a co-antioxidant; The main antioxidant is at least one of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, and octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; The co-antioxidant is at least one of tris(2,4-di-tert-butylphenyl)phosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite, or bis(2,4-dicumylphenyl)-diphosphite; 4. The green and low-carbon glass fiber-reinforced polypropylene composite material according to claim 3, wherein, The odor remover is at least one of an inorganic substance with a porous structure, an organic substance with a porous structure, and an inorganic substance / organic substance composite with a porous structure; 5. The green and low-carbon glass fiber-reinforced polypropylene composite material according to claim 4, characterized in that, The low-VOC compatibilizer is at least one of low-VOC maleic anhydride grafted polypropylene, maleic anhydride grafted polyethylene, and maleic anhydride grafted ethylene-octene copolymer; 6. The green and low-carbon glass fiber-reinforced polypropylene composite material according to claim 5, wherein The composite material further includes other additives, and the other additives are lubricant and black additive; The lubricant is maleic anhydride grafted polypropylene wax; The black additive is a medium-high pigment ultra-fine carbon black masterbatch with polypropylene or polyethylene as the carrier; 7. The green and low-carbon glass fiber reinforced polypropylene composite material according to claim 6, wherein The composite material includes, by weight fraction: 20-40% of low-carbon polypropylene material, 20-50% of polypropylene resin, 10-30% of glass fiber, 0.3-0.8% of antioxidant, 0.5-2.0% of odor remover, 0.5-4% of low-VOC compatibilizer, 0.2-1.0% of chain extender, 0.3-0.8% of lubricant, and 1.0-2.0% of black additive.

8. A device, characterized in that, For preparing the green low-carbon glass fiber reinforced polypropylene composite material as described in any one of claims 1-7, the device includes: A suction hopper, a first suction motor, an A tank suction pipe, a first suction stop valve, a double-layer tank A tank, a first circulation pump, an A tank circulation pipe, an A tank heating pipe, an A tank high level gauge, an A tank low level gauge, a first circulation stop valve, a double-layer tank B tank, a second circulation pump, a B tank circulation pipe, a second circulation stop valve, a second suction motor, a B tank suction pipe, a second suction stop valve, a B tank high level gauge, a B tank low level gauge, a B tank heating pipe, an A-C suction pipe, a third suction stop valve, a B-C suction pipe, a fourth suction stop valve, a third suction motor, a single-layer cooling and homogenizing tank C tank, a C tank high level gauge, a C tank low level gauge, a third circulation pump, a C tank circulation pipe, a third circulation stop valve, a discharge valve, and a discharge bucket; The material suction hopper is connected to one end of the A-tank suction pipe, and the other end of the A-tank suction pipe is connected to the upper end of the double-layer tank A-tank. The first suction motor and the first suction stop valve control the conveyance of materials from the material suction hopper to the double-layer tank A-tank. The materials include, by weight parts: 20-40% of low-carbon polypropylene material, 20-50% of polypropylene resin, 10-30% of glass fiber, 0.3-0.8% of antioxidant, 0.5-2.0% of odor remover, 0.5-4% of low-VOC compatibilizer, 0.2-1.0% of chain extender, 0.3-0.8% of lubricant, and 1.0-2.0% of black additive; The material suction hopper is connected to one end of the B-tank suction pipe, and the other end of the B-tank suction pipe is connected to the upper end of the double-layer tank B-tank. The second suction motor and the second suction stop valve control the conveyance of materials from the material suction hopper to the double-layer tank B-tank; The A-tank heating pipe is arranged in the double-layer tank A-tank for heating the materials in the double-layer tank A-tank. The A-tank high-level meter is arranged at the upper end of the double-layer tank A-tank, and the A-tank low-level meter is arranged at the lower end of the double-layer tank A-tank; The B-tank heating pipe is arranged in the double-layer tank B-tank for heating the materials in the double-layer tank B-tank. The B-tank high-level meter is arranged at the upper end of the double-layer tank B-tank, and the B-tank low-level meter is arranged at the lower end of the double-layer tank B-tank; A number of first interfaces are arranged at the lower port of the double-layer tank A-tank. One end of the A-tank circulation pipe is connected to one of the first interfaces, and the other end of the A-tank circulation pipe is connected to the upper port of the double-layer tank A-tank. The first circulation pump and the first circulation stop valve are arranged on the A-tank circulation pipe for controlling the circulation of the materials in the double-layer tank A-tank within the double-layer tank A-tank; A number of second interfaces are arranged at the lower port of the double-layer tank B-tank. One end of the B-tank circulation pipe is connected to one of the second interfaces, and the other end of the B-tank circulation pipe is connected to the upper port of the double-layer tank B-tank. The second circulation pump and the second circulation stop valve are arranged on the B-tank circulation pipe for controlling the circulation of the materials in the double-layer tank B-tank within the double-layer tank B-tank; One end of the A-C suction pipe is connected to another one of the first interfaces, and the other end of the A-C suction pipe is connected to one end of the total suction pipe. One end of the B-C suction pipe is connected to another one of the second interfaces, and the other end of the B-C suction pipe is connected to one end of the total suction pipe. The other end of the total suction pipe is connected to the upper port of the single-layer cooling and homogenizing tank C-tank. The third suction stop valve is arranged on the A-C suction pipe, the fourth suction stop valve is arranged on the B-C suction pipe, and the third suction motor is arranged on the total suction pipe for conveying the materials in the double-layer tank A-tank or the materials in the double-layer tank B-tank to the single-layer cooling and homogenizing tank C-tank; The upper end of the single-layer cooling and homogenizing tank C tank is provided with the high-level meter of the C tank, and the lower end of the single-layer cooling and homogenizing tank C tank is provided with the low-level meter of the C tank; one end of the C tank circulation pipe is connected to the lower port of the single-layer cooling and homogenizing tank C tank, and the other end of the C tank circulation pipe is connected to the upper port of the single-layer cooling and homogenizing tank C tank. The C tank circulation pipe is provided with the third circulation pump and the third circulation stop valve for controlling the circulation of the materials in the single-layer cooling and homogenizing tank C tank in the single-layer cooling and homogenizing tank C tank. The upper end of the discharging bucket is connected to the lower port of the single-layer cooling and homogenizing tank C tank, and the materials in the single-layer cooling and homogenizing tank C tank are conveyed to the discharging bucket through the discharging valve. The device further includes: a control component, which includes a PLC host and a control terminal. The control terminal is used to control the PLC host to execute computer instructions; the computer instructions include controlling the opening and closing of the first suction motor, the first suction stop valve, the first circulation pump, the first circulation stop valve, the second circulation pump, the second circulation stop valve, the second suction motor, the second suction stop valve, the third suction stop valve, the fourth suction stop valve, the third suction motor, the third circulation pump, the third circulation stop valve and the discharging valve, and setting the suction time, heating temperature and circulating heating time in the double-layer tank A tank, setting the suction time, heating temperature and circulating heating time in the double-layer tank B tank, and setting the suction time and cooling and homogenizing time in the single-layer cooling and homogenizing tank C tank.

9. A preparation method of a green and low-carbon glass fiber reinforced polypropylene composite material, characterized in that, Based on the green and low-carbon glass fiber reinforced polypropylene composite material according to any one of claims 1-7, the preparation method includes: Drying the low-carbon polypropylene material and polypropylene resin, wherein the drying temperature is 80-100 °C and the drying time is 4-6 h. Pre-mixing the dried low-carbon polypropylene material and polypropylene resin in a high-speed mixer to obtain an initial mixed material. Mixing the initial mixed material, antioxidant, odor remover, low-VOC compatibilizer, chain extender and other additives in the high-speed mixer to obtain a secondary mixed material. Adding the secondary mixed material from the main feeding port and conveying it into the screw cavity of the twin-screw extruder, adding glass fiber from the side feeding port and conveying it into the screw cavity of the twin-screw extruder, heating and melting, extruding and granulating, and sieving in the screw cavity to obtain composite particles. Adding the composite particles into the device according to claim 8 for devolatilization treatment to obtain the green and low-carbon glass fiber reinforced polypropylene composite material.

10. The preparation method of the green and low-carbon glass fiber reinforced polypropylene composite material according to claim 9, characterized in that, The main machine speed of the twin-screw extruder is 300-400 rpm; the heating and melting temperature is 220-240 °C.

Images