Microwave reinforced ionic liquid modified waste residue polypropylene composite material and preparation method thereof

Abstract

The application relates to the technical field of high polymer composite materials, and particularly discloses a microwave-enhanced ion liquid modified waste residue polypropylene composite material and a preparation method thereof. The microwave-enhanced ion liquid modified waste residue polypropylene composite material comprises artificial stone waste residue modified by microwave-enhanced ion liquid, polypropylene and a processing aid; the power of the microwave is 600-1000 W, the time of the microwave is 1-3 min; the ion liquid is 1-ethyl-3-methyl imidazole acetate; and the mass of the ion liquid is 0.4%-1% of the mass of the artificial stone waste residue. The microwave-enhanced ion liquid modified waste residue polypropylene composite material realizes the rigid and tough balance under high filling, solves the problem of poor compatibility between the artificial stone waste residue and the polypropylene in the prior art, sharp decrease in toughness under high filling, and realizes the effective application of the artificial stone waste residue.

Description

Technical Field

[0001] This invention relates to the field of solid waste resource utilization technology, specifically to the field of polymer composite material technology, and more specifically to a microwave-enhanced ionic liquid modified polypropylene composite material for waste residue and its preparation method. Background Technology

[0002] Artificial stone (also known as artificial marble) is a type of artificial stone made from natural marble chips, quartz sand, and other aggregates, using unsaturated polyester resin (UPR) as a binder. It is produced through processes such as mixing, molding, curing, and polishing, and is widely used in architectural decoration and furniture countertops. During the production and processing of artificial stone, cutting and grinding processes generate a large amount of waste, known as artificial stone waste (ASWs). The main components of these ASWs are calcium carbonate (CaCO3, approximately 90-92 wt%) and thermosetting unsaturated polyester resin (approximately 7-9 wt%) coating its surface, forming a unique "core-shell" structure. This structure consists of a highly reactive calcium carbonate core inside and a chemically inert, densely cross-linked polyester resin shell on the outside. Currently, most artificial stone waste is landfilled or simply incinerated, resulting in resource waste and environmental pressure.

[0003] Using artificial quartz waste as a filler in thermoplastics (such as polypropylene and polyethylene) is one of the important ways to realize their resource utilization. However, the polyester resin shell on the surface of artificial quartz waste is chemically inert, resulting in poor compatibility with polypropylene, difficulty in dispersion in the matrix, and low filling amount (usually less than 35 wt%), making it impossible to achieve large-scale disposal and high performance. Existing technologies mostly use coupling agents such as titanates and aluminates to modify the surface of artificial quartz waste. Although this can improve compatibility to a certain extent, it cannot effectively destroy the dense cross-linked network structure of polyester resin, and the highly active calcium carbonate core inside cannot be fully exposed, resulting in limited modification effect. It is difficult for composite materials to simultaneously obtain high rigidity and high toughness.

[0004] Therefore, a new technical solution needs to be developed that can efficiently destroy the inert polyester resin shell layer on the surface of artificial quartz waste, fully expose the highly active calcium carbonate core inside, achieve deep activation and firm chemical anchoring of the filler surface, so that the composite material can simultaneously obtain high rigidity and high toughness under high filling amount (such as 50wt% and above), achieve a balance between rigidity and toughness, and the process is simple, green and efficient, suitable for industrial production. Summary of the Invention

[0005] The purpose of this invention is to provide a microwave-enhanced ionic liquid modified polypropylene composite material for waste residue and its preparation method, in order to solve the problem in the prior art that the poor compatibility between artificial quartz waste residue and polypropylene, and the sharp decrease in toughness under high filling, is caused by the strong chemical inertness of the unsaturated polyester resin shell on the surface.

[0006] Inventive Concept: This invention utilizes the synergistic effect of microwave technology and 1-ethyl-3-methylimidazolium acetate to achieve efficient modification and application of artificial quartz waste. The high-frequency electromagnetic field of microwaves generates a strong dipole polarization effect on highly polar ionic liquids, producing a rapid and uniform thermal effect and reducing the reaction activation energy (non-thermal effect). Under this environment, 1-ethyl-3-methylimidazolium acetate can effectively penetrate into the surface micro-regions of artificial quartz waste, playing a dual role: First, the imidazole cations in the ionic liquid have a certain degree of strong polarity and Lewis acidity, which helps them to adsorb and penetrate into the polyester resin shell, destroying the cross-linked network structure of the unsaturated polyester resin in the shell and partially exposing the highly active calcium carbonate core inside; Second, the acetate anion of the ionic liquid has a certain degree of alkalinity, which can form ionic bonds with functional groups such as carboxyl groups in the polyester resin shell, and can also form strong hydrogen bonds with the hydroxyl groups on the exposed calcium carbonate surface. This multi-functional approach of "penetration-activation-bonding" provided by the synergistic action of ionic liquid anions and cations is enhanced with the assistance of microwave energy, achieving efficient activation and firm chemical anchoring of the surface of artificial quartz waste residue, and greatly improving its interfacial compatibility with the polypropylene matrix.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention discloses a microwave-enhanced ionic liquid-modified polypropylene composite material for waste residue.

[0009] The microwave-enhanced ionic liquid modified polypropylene composite material comprises artificial quartz waste modified by microwave-enhanced ionic liquid, polypropylene, and processing aids; the microwave power is 600-1000W, and the microwave duration is 1-3min; the mass of the ionic liquid is 0.4%-1% of the mass of the artificial quartz waste; and the ionic liquid is 1-ethyl-3-methylimidazolium acetate.

[0010] Furthermore, the power of the microwave is 700-900W, such as 750W, 780W, 800W, 820W, or 850W; the duration of the microwave is 1.5-2.5min, such as 1.7min, 1.8min, 1.9min, 2.0min, 2.1min, 2.2min, or 2.3min; and the mass of the ionic liquid is 0.4%-0.8% of the mass of the artificial quartz waste residue, such as 0.5%, 0.6%, or 0.7%.

[0011] Furthermore, the microwave power is 800W, the microwave duration is 2min, and the mass of the ionic liquid is 0.5% of the mass of the artificial quartz waste residue.

[0012] The weight ratio of the artificial quartz waste modified by microwave-enhanced ionic liquid to polypropylene is 50:(37-57), such as 50:42, 50:44, 50:45, 50:46, 50:47, 50:48, 50:49, 50:50, 50:52.

[0013] Furthermore, the weight ratio of the artificial quartz waste modified by microwave-enhanced ionic liquid to polypropylene is 50:47.

[0014] The processing aid is selected from any one or more combinations of polyethylene wax, stearic acid, zinc stearate and calcium stearate.

[0015] Furthermore, the weight ratio of the artificial quartz waste modified by microwave-enhanced ionic liquid to the processing aid is 50:(1.5-5.5), such as 50:2.0, 50:2.5, 50:3.0, 50:3.5, 50:4.0, 50:4.5, or 50:5.0.

[0016] Further, the processing aids are polyethylene wax, stearic acid, and zinc stearate; further, the weight ratio of the artificial quartz waste modified by microwave-enhanced ionic liquid to polyethylene wax, stearic acid, and zinc stearate is 50:(0.6-1.0):(0.5-0.9):(0.8-1.2), such as 50:0.8:0.7:1.

[0017] The impact strength of the microwave-strengthened ionic liquid modified waste polypropylene composite material is 6.0-8.0 kJ / m. 2 The elongation at break is 120-160%.

[0018] Secondly, the present invention discloses a method for preparing microwave-enhanced ionic liquid modified waste polypropylene composite material as described in the first aspect above.

[0019] The preparation method includes:

[0020] (1) Artificial quartz waste residue and ionic liquid are microwave-treated to obtain artificial quartz waste residue modified by microwave-enhanced ionic liquid.

[0021] (2) The artificial quartz waste modified by microwave-enhanced ionic liquid, polypropylene and processing aids are mixed to obtain a premix;

[0022] (3) The premixed material is melt-extruded and granulated in a twin-screw extruder, and the resulting granules are injection molded.

[0023] In step (1), the artificial quartz waste residue and ionic liquid are mixed and stirred so that the ionic liquid is uniformly attached to the surface of the waste residue, and then treated under microwave radiation to obtain artificial quartz waste residue modified by microwave-enhanced ionic liquid. Wherein, the microwave power is 600-1000W, and the microwave duration is 1-3min; the mass of the ionic liquid is 0.4%-1% of the mass of the artificial quartz waste residue; the ionic liquid is 1-ethyl-3-methylimidazolium acetate; further, the microwave power is 700-900W, such as 750W, 780W, 800W, 820W, 850W; the microwave duration is 1.5-2.5min, such as 1.7min, 1.8min, 1.9min, 2.0min, 2.1min, 2.2min, 2.3min; the mass of the ionic liquid is 0.4%-0.8% of the mass of the artificial quartz waste residue, such as 0.5%, 0.6%, 0.7%; further, the microwave power is 800W, the microwave duration is 2min, and the mass of the ionic liquid is 0.5% of the mass of the artificial quartz waste residue.

[0024] In step (1), the ionic liquid is 1-ethyl-3-methylimidazolium acetate.

[0025] In step (2), the weight ratio of the microwave-enhanced ionic liquid modified artificial granite waste to polypropylene is 50:(37-57), such as 50:42, 50:44, 50:45, 50:46, 50:47, 50:48, 50:49, 50:50, or 50:52. Further, the weight ratio of the microwave-enhanced ionic liquid modified artificial granite waste to polypropylene is 50:47.

[0026] In step (2), the processing aid is selected from any one or more combinations of polyethylene wax, stearic acid, zinc stearate, and calcium stearate. Further, the weight ratio of the microwave-enhanced ionic liquid modified artificial quartz waste to the processing aid is 50:(1.5-5.5), such as 50:2.0, 50:2.5, 50:3.0, 50:3.5, 50:4.0, 50:4.5, or 50:5.0. Further, the processing aid is polyethylene wax, stearic acid, and zinc stearate; further, the weight ratio of the microwave-enhanced ionic liquid modified artificial quartz waste to polyethylene wax, stearic acid, and zinc stearate is 50:(0.6-1.0):(0.5-0.9):(0.8-1.2), such as 50:0.8:0.7:1.

[0027] In step (2), the mixing is premixing in a high-speed mixer for 5-10 minutes; the speed of the high-speed mixer is 800-1200 rpm.

[0028] In step (3), the twin-screw extruder is a co-rotating twin-screw extruder; the length-to-diameter ratio of the co-rotating twin-screw extruder is 40:1, and the screw speed is 200-400 rpm; the temperature of the partition in the co-rotating twin-screw extruder is set to 160-220℃.

[0029] In this invention, the polypropylene is copolymer polypropylene with a density of 0.8-1.0 g / cm³. 3 The melt flow rate (230℃, 2.16kg) is 2.5-3.8g / 10min, and the shrinkage rate (MD: 23℃) is 1.4%-1.8%. The copolymer polypropylene is mainly composed of propylene monomer, which is copolymerized with ethylene monomer.

[0030] In this invention, the particle size distribution of the artificial quartz waste is 800-1250 mesh, such as 1000 mesh.

[0031] The artificial quartz waste modified with microwave-enhanced ionic liquid provided by this invention exhibits excellent interfacial compatibility with a polypropylene matrix. Even when the content of the microwave-enhanced ionic liquid-modified artificial quartz waste reaches approximately 50 wt%, it can still be uniformly dispersed, maintaining high rigidity while achieving a significant improvement in toughness; specifically, the impact strength is 6.0-8.0 kJ / m. 2 The elongation at break is 120-160%, and further, the tensile strength is 17.0-18.0 MPa, the flexural strength is 26-28 MPa, and the flexural modulus is 1900-2100 MPa, achieving a balance between rigidity and toughness.

[0032] The beneficial effects of this invention are:

[0033] (1) This invention is the first to use microwave-assisted 1-ethyl-3-methylimidazolium acetate to modify artificial quartz waste. The high-frequency electromagnetic field of microwaves generates a dipole polarization effect on the strongly polar ionic liquid, producing a rapid and uniform thermal effect and reducing the activation energy of the reaction. The penetration energy of the imidazolium cations in the ionic liquid destroys the cross-linking network of the unsaturated polyester resin. At the same time, the acetate anions in the ionic liquid form ionic bonds with functional groups such as carboxyl groups in the shell of the polyester resin, and form strong hydrogen bonds with the hydroxyl groups on the exposed calcium carbonate surface, realizing multiple functions of "penetration-activation-bonding".

[0034] (2) The technical solution provided by this invention achieves a balance between stiffness and toughness in the composite material when the filling amount reaches about 50wt%. For example, compared with the composite material made from unmodified artificial quartz waste, the composite material made from artificial quartz waste modified by microwave-strengthened ionic liquid in this invention has an elongation at break increased from 83.47% to 140.74%, an increase of up to 68.6%; the impact strength increased from 4.90kJ / m 2 Increased to 7.12 kJ / m 2 The improvement was as high as 45.3%; at the same time, the tensile strength increased from 17.15MPa to 17.61MPa, an increase of 2.7%; the flexural strength decreased from 29.17MPa to 26.99MPa, a decrease of only 2.8%; and the flexural modulus decreased from 2035.75MPa to 1960.70MPa, a decrease of only 3.69%. It can be seen that the technical solution provided by the present invention has broken through the technical bottleneck of the sharp decrease in toughness caused by artificial quartz waste under high filling, and achieved a balance between rigidity and toughness under high filling.

[0035] (3) The technical solution provided by the present invention features rapid and uniform microwave heating, low energy consumption, low ionic liquid usage, simple process, easy large-scale production, and is suitable for industrial application. Attached Figure Description

[0036] Figure 1 The image shows a scanning electron microscope (SEM) image of the unmodified artificial granite waste residue in Comparative Example 1.

[0037] Figure 2 The image shows a scanning electron microscope (SEM) image (×5000) of the impact fracture surface of the composite material prepared in Comparative Example 1.

[0038] Figure 3 The image shows a scanning electron microscope (SEM) image of the artificial quartz waste residue treated only with microwave in Comparative Example 2.

[0039] Figure 4 The image shows a scanning electron microscope (SEM) image (×5000) of the impact fracture surface of the composite material prepared in Comparative Example 2.

[0040] Figure 5 This is a scanning electron microscope image of the artificial granite waste residue treated with only ionic liquid in Comparative Example 3.

[0041] Figure 6 The image shows a scanning electron microscope (SEM) image (×5000) of the impact fracture surface of the composite material prepared in Comparative Example 3.

[0042] Figure 7 This is a scanning electron microscope image of the artificial quartz waste residue modified by microwave-enhanced ionic liquid in Example 1.

[0043] Figure 8 The image shown is a scanning electron microscope (SEM) image (×5000) of the impact fracture surface of the composite material obtained in Example 1. Detailed Implementation

[0044] The present invention can be better understood from the following embodiments. However, those skilled in the art will readily understand that the descriptions in the embodiments are for illustrative purposes only and should not, and will not, limit the invention as detailed in the claims.

[0045] Unless otherwise specified, the experimental methods described in the following examples are conventional methods; unless otherwise specified, the reagents and materials are commercially available.

[0046] In the following examples, the polypropylene is copolymer polypropylene, K8003, with a density of 0.9 g / cm³. 3 The melt flow rate (230℃, 2.16kg) is 3.0g / 10min, and the shrinkage rate (MD: 23℃) is 1.4%-1.8%. The polyethylene wax is of type WL-102, with a density of 0.91-0.93g / cm³. 3 The viscosity (CPS 140℃) is 8, and the softening point is 99.5℃. The zinc stearate has a molecular weight of 632.33, a metal content of 10.0-11.5%, a loss on heating ≤1.0%, free acid <0.5%, a melting point of 118-125°C, and a fineness (%) (325 mm passing through) >99. The calcium stearate has a calcium content of 6.0-7.0%, free acid (calculated as stearic acid) ≤0.5%, and a molecular formula (C... 17 H 35 COO)2Ca, moisture <2.0%, molecular weight 606, CAS NO.1592-23-0, specific gravity 1.08. Stearic acid type 1801, molecular formula C 18 H 36 O2, CAS NO.57-11-4, acid value 205-212MgKOH / g, appearance: glossy white bead-like granules, melting point 69-70℃, boiling point 383℃, refractive index (80℃) 1.4299.

[0047] The terms used in the following embodiments are defined as follows: Artificial quartz waste residue (ASWs) refers to the waste residue generated during the production and cutting of artificial quartz stone. Its main components are calcium carbonate and unsaturated polyester resin coated on its surface, forming a core-shell structure. Tensile strength and elongation at break are tested according to GB / T 1040.2 standard using an electronic universal testing machine at a tensile rate of 50 mm / min. Flexural strength and flexural modulus are tested according to GB / T 9341-2008 standard. Impact strength is tested according to GB / T 1843-2008 standard.

[0048] Comparative Example 1

[0049] This comparative example provides a method for preparing unmodified artificial quartz waste-filled polypropylene composite materials.

[0050] Take 1000 grams of 800-mesh artificial quartz stone waste powder, without adding any modifiers or microwaving. The artificial quartz stone waste is production waste provided by artificial quartz stone manufacturers, obtained by crushing and sieving. For example... Figure 1 As shown in the scanning electron microscope images of unmodified ASWs, the waste particles are irregularly shaped lumps with a dense and smooth surface, and no obvious pores or protrusions are observed. The particle edges are relatively rounded, and there is varying degrees of aggregation between the particles.

[0051] 50 parts by weight of unmodified ASWs, 47 parts by weight of polypropylene, 0.8 parts by weight of polyethylene wax, 0.7 parts by weight of stearic acid, and 1 part by weight of zinc stearate were added to a high-speed mixer. The high-speed mixer was set to 1000 rpm and mixed for 5 minutes to obtain a premix.

[0052] The premixed material was fed into a co-rotating twin-screw extruder for melt extrusion granulation. The co-rotating twin-screw extruder had a length-to-diameter ratio of 40:1 and a screw speed of 300 rpm. The temperatures of each zone of the co-rotating twin-screw extruder, from the feeding section to the die head, were set sequentially to 165℃, 175℃, 185℃, 195℃, 200℃, 200℃, and 195℃. The extruded melt was water-cooled and pelletized to obtain composite material granules. The composite material granules were then injection molded into standard test specimens on an injection molding machine, designated as sample D1. The injection temperature was 210℃, and the injection pressure was 40 MPa.

[0053] The test results are shown in Table 1. The composite material prepared in Comparative Example 1 has a tensile strength of 17.15 MPa, an elongation at break of 83.47%, a flexural strength of 29.17 MPa, a flexural modulus of 2035.75 MPa, and an impact strength of 4.90 kJ / m². 2 .like Figure 2 As shown in the scanning electron microscope image of the impact fracture surface of the composite material prepared in Comparative Example 1, the filler agglomerates severely, the interfacial bonding is poor, and there are a large number of voids and filler detachment, indicating that the filler has poor compatibility with the polypropylene matrix and the interfacial bonding is weak.

[0054] Comparative Example 2

[0055] This comparative example provides a method for preparing a polypropylene composite material filled with artificial quartz waste treated only by microwave.

[0056] The difference from Comparative Example 1 is that the ASWs were microwave-treated before the composite material preparation. 1000 grams of 800-mesh artificial quartz waste powder, without adding any modifiers, was placed directly into a microwave reactor. The microwave power was set to 800W, the reactor temperature was controlled at 100℃, and the treatment time was 10 minutes. After microwave treatment, the powder was placed in a desiccator and allowed to cool naturally to room temperature, yielding microwave-treated ASWs. Figure 3 As shown in the scanning electron microscope images of microwave-treated ASWs, compared to unmodified ASWs, the particles are irregularly shaped blocks with clear surface contours and a relatively smooth and flat surface. The particle edges are clearly defined, and the degree of aggregation between particles is slightly reduced.

[0057] The ASWs that were only microwave-treated were used to prepare composite materials according to the same formulation and process as Comparative Example 1, which were designated as Sample D2.

[0058] Test results show that the composite material prepared in Comparative Example 2 has a tensile strength of 17.55 MPa, an elongation at break of 114.61%, a flexural strength of 29.41 MPa, a flexural modulus of 2116.38 MPa, and an impact strength of 5.11 kJ / m². 2 Compared to Comparative Example 1, tensile strength increased by 2.3%, elongation at break increased by 37.3%, and impact strength increased by 4.3%. Figure 4 As shown in the scanning electron microscope images of the impact fracture surfaces of the composite materials prepared in Comparative Example 2, the filler dispersion was slightly improved, the interface between the filler and the matrix was still relatively clear, but the number of voids was reduced, indicating that microwave treatment had a certain activation effect on ASWs and improved the compatibility between the filler and the matrix, but the modification effect was limited.

[0059] Comparative Example 3

[0060] This comparative example provides a method for preparing a polypropylene composite material filled with artificial quartz waste treated only with ionic liquid.

[0061] The difference from Comparative Example 1 is that the ASWs were treated with ionic liquid before the composite material preparation. 1000g of 800-mesh artificial granite waste powder was mixed with 1g of 1-ethyl-3-methylimidazolium acetate in a high-speed mixer at room temperature (the mass of the ionic liquid was 0.1wt% of the mass of the ASWs) for 10 minutes, allowing the ionic liquid to uniformly adhere to the surface of the ASWs particles. After stirring, no microwave treatment was performed, directly obtaining the ASWs treated only with ionic liquid. Figure 5 As shown, the large particles of ASWs treated only with ionic liquids have rough and uneven surfaces with a large number of grooves, pits and step-like structures, and no smooth primary mineral cross-sections. This indicates that the ionic liquid has etched / wetted the particle surface, providing certain interface sites for polypropylene (PP) composites, but the dispersibility is still limited.

[0062] ASWs treated only with ionic liquids were used to prepare composite materials according to the same formulation and process as Comparative Example 1, which were designated as sample D3.

[0063] Test results show that the composite material prepared in Comparative Example 3 has a tensile strength of 17.44 MPa, an elongation at break of 109.03%, a flexural strength of 29.32 MPa, a flexural modulus of 2083.35 MPa, and an impact strength of 5.43 kJ / m². 2 Compared to Comparative Example 1, tensile strength increased by 1.7%, elongation at break increased by 30.6%, and impact strength increased by 10.8%. Figure 6 As shown in the scanning electron microscope image of the impact fracture surface of the composite material prepared in Comparative Example 3, the filler dispersion is good and the interfacial bonding is improved. The interface between the filler and the matrix is ​​more blurred than that in Comparative Example 1, but interface defects are still visible in some areas. This indicates that the ionic liquid treatment improved the compatibility between the filler and the matrix, but failed to fully destroy the UPR shell, and the modification effect was limited. The interface was not completely tightly coated.

[0064] Comparative Example 4: 240W - 2min - 0.1%

[0065] This embodiment provides a method for preparing a microwave-enhanced ionic liquid modified polypropylene composite material from artificial quartz waste, using a combination of process parameters including 240W microwave power, 2 minutes microwave treatment time, and 0.1wt% ionic liquid.

[0066] 1000g of 800-mesh artificial quartz waste powder and 1g of 1-ethyl-3-methylimidazolium acetate were stirred in a high-speed mixer at room temperature for 10 minutes to allow the ionic liquid to uniformly adhere to the surface of the ASWs particles. The ASWs mixture with the ionic liquid attached was placed in a microwave reactor, with the microwave power set to 240W, the reactor temperature controlled at 100℃, and the treatment time set to 2 minutes. After microwave treatment, the mixture was allowed to cool naturally to room temperature to obtain the modified ASWs.

[0067] The modified ASWs were used to prepare composite materials according to the same formulation and process as Comparative Example 1, and this was designated as Sample D4.

[0068] Comparative Example 5: 240W - 6min - 0.3%

[0069] In Comparative Example 4, the amount of ionic liquid added was changed to 3 grams (0.3 wt%), the microwave treatment time was changed to 6 minutes, and all other conditions remained unchanged. This sample is denoted as D5.

[0070] Comparative Example 6: 240W - 10min - 0.5%

[0071] In Comparative Example 4, the amount of ionic liquid added was changed to 5 grams (0.5 wt%), and the microwave treatment time was changed to 10 minutes, while other conditions remained unchanged. This sample was designated as D6.

[0072] Comparative Example 7: 400W - 2min - 0.3%

[0073] In Comparative Example 4, the microwave power was changed to 400W, and the amount of ionic liquid added was changed to 3 grams (0.3wt%), while other conditions remained unchanged. This sample is denoted as D7.

[0074] Comparative Example 8: 400W - 6min - 0.5%

[0075] In Comparative Example 4, the microwave power was changed to 400W, the amount of ionic liquid added was 5 grams (0.5wt%), and the microwave treatment time was 6 minutes, while other conditions remained unchanged. This sample was designated as D8.

[0076] Comparative Example 9: 400W - 10min - 0.1%

[0077] In Comparative Example 4, the microwave power was changed to 400W, the amount of ionic liquid added was 1 gram (0.1wt%), and the microwave treatment time was changed to 10 minutes, while other conditions remained unchanged. This sample was designated as D9.

[0078] Example 1: 800W - 2min - 0.5%

[0079] In Comparative Example 4, the microwave power was changed to 800W, and the amount of ionic liquid added was changed to 5 grams (0.5wt%), while other conditions remained unchanged. This sample is denoted as E1.

[0080] like Figure 7 As shown in the image, scanning electron microscope (SEM) images of ASWs treated with an 800W-2min-0.5% synergistic modification process reveal significant damage and exfoliation of the UPR shell on the particle surface compared to unmodified ASWs. This exposes some CaCO3 cores, increases particle surface roughness, and significantly reduces particle aggregation. This indicates that the synergistic effect of microwave and ionic liquid effectively disrupts the dense UPR crosslinking network, achieving deep activation of the ASWs surface. The SEM image of the impact fracture surface of the resulting composite material is shown below. Figure 8 As shown, the filler particles in the cross-section are uniformly dispersed in the matrix, with no obvious agglomeration. The interface between the filler particles and the matrix is ​​blurred, and the filler is tightly wrapped by the matrix. The cross-section shows many matrix tensile deformation characteristics, but no obvious filler detachment pores are observed.

[0081] Comparative Example 10: 800W - 6min - 0.1%

[0082] In Comparative Example 4, the microwave power was changed to 800W and the microwave treatment time to 6 minutes, while other conditions remained unchanged. This is denoted as sample D10.

[0083] Comparative Example 11: 800W - 10min - 0.3%

[0084] In Comparative Example 4, the microwave power was changed to 800W, the amount of ionic liquid added was 3 grams (0.3wt%), and the microwave treatment time was changed to 10 minutes, while other conditions remained unchanged. This sample was designated as D11.

[0085] Comparative Example 12: 800W - 2min - 0.5%

[0086] In Comparative Example 4, the microwave power was changed to 800W, the ionic liquid was changed to 1-butyl-3-methylimidazolium chloride, and the amount added was changed to 5 grams (0.5 wt%). The microwave treatment time was 2 minutes, and other conditions remained unchanged. This sample was denoted as D12.

[0087] Experimental Results and Analysis: The performance of the above samples was tested according to the aforementioned method, and the results are summarized in Table 1.

[0088] Table 1 Mechanical properties of composite materials prepared under different processing conditions

[0089]

[0090] This invention achieves highly efficient activation of ASWs by combining microwave treatment with 1-ethyl-3-methylimidazolium acetate modification within a specific process parameter window (800W-2min-0.5%). Compared to using microwaves or ionic liquids alone, this method maintains material rigidity while significantly improving the impact strength of the composite material (up to 7.12 kJ / m²). 2 This synergistic effect is not a simple additive effect, but a unique technical effect produced by the interaction of microwaves and specific ionic liquids under specific process conditions. It achieves a balance between rigidity and toughness of artificial quartz waste at a high filling amount of about 50 wt% in polypropylene, providing a green and efficient technical solution for the resource utilization of artificial quartz waste.

[0091] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A microwave-enhanced ionic liquid-modified polypropylene composite material for waste residue, characterized in that, The product comprises artificial quartz waste modified by microwave-enhanced ionic liquid, polypropylene, and processing aids; the microwave power is 780-820W, and the microwave duration is 1.8-2.2min; the mass of the ionic liquid is 0.4%-0.6% of the mass of the artificial quartz waste; the ionic liquid is 1-ethyl-3-methylimidazolium acetate; and the weight ratio of the microwave-enhanced ionic liquid modified artificial quartz waste to polypropylene is 50:(46-48).

2. The microwave-enhanced ionic liquid-modified polypropylene composite material for waste residue according to claim 1, characterized in that, The microwave power is 800W, the microwave duration is 2min, and the mass of the ionic liquid is 0.5% of the mass of the artificial quartz waste residue.

3. The microwave-enhanced ionic liquid-modified polypropylene composite material for waste residue according to claim 1, characterized in that, The weight ratio of the artificial quartz waste modified by microwave-enhanced ionic liquid to polypropylene is 50:

47.

4. The microwave-enhanced ionic liquid-modified polypropylene composite material for waste residue according to claim 1, characterized in that, The processing aid is selected from any one or more combinations of polyethylene wax, stearic acid, zinc stearate and calcium stearate.

5. The microwave-enhanced ionic liquid-modified polypropylene composite material for waste residue according to claim 4, characterized in that, The weight ratio of the artificial quartz waste modified by microwave-enhanced ionic liquid to the processing aid is 50:(1.5-5.5).

6. The microwave-enhanced ionic liquid-modified polypropylene composite material for waste residue according to claim 4, characterized in that, The processing aids are polyethylene wax, stearic acid, and zinc stearate; the weight ratio of the artificial quartz waste modified by microwave-enhanced ionic liquid to polyethylene wax, stearic acid, and zinc stearate is 50:(0.6-1.0):(0.5-0.9):(0.8-1.2).

7. The microwave-enhanced ionic liquid-modified polypropylene composite material for waste residue according to any one of claims 1-6, characterized in that, The impact strength of the microwave-strengthened ionic liquid-modified polypropylene composite material is 6.0-8.0 kJ / m. 2 The elongation at break is 120-160%.

8. The method for preparing the microwave-enhanced ionic liquid modified waste polypropylene composite material according to any one of claims 1-6, characterized in that, include: (1) Artificial quartz waste residue and ionic liquid are microwave-treated to obtain artificial quartz waste residue modified by microwave-enhanced ionic liquid. (2) The artificial quartz waste modified by microwave-enhanced ionic liquid, polypropylene and processing aids are mixed to obtain a premix; (3) The premixed material is melt-extruded and granulated in a twin-screw extruder to obtain granules, and the granules are injection molded.

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