High-toughness composite recycled plastic and preparation method thereof

Abstract

The present application relates to the technical field of high polymer materials, and more particularly to a high-toughness composite recycled plastic and a preparation method thereof, which specifically comprises recycled polypropylene, KH550 modified TiO2 nanoparticles and surface-treated fly ash; the surface-treated fly ash is selected from one or more of isopropyl palmitate treated fly ash, furfuryl palmitate treated fly ash, ethyl myristate treated fly ash and ethyl oleate treated fly ash. On the basis of the prior art, the isopropyl palmitate, furfuryl palmitate, ethyl myristate and ethyl oleate are used to treat the fly ash and are compounded with the KH550-TiO2 nanoparticles, so as to further improve the mechanical properties of the recycled polypropylene. Meanwhile, the number of hydroxyl groups on the surface of the fly ash is further increased through acid treatment, the interfacial adhesion between the fly ash and the recycled polypropylene is improved, and the mechanical properties are further improved.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a high-toughness composite recycled plastic and its preparation method. Background Technology

[0002] The global generation of plastic waste is enormous, but the recycling rate is very low. Large quantities of plastic waste are landfilled, incinerated, or carelessly dumped, causing serious environmental pollution. For example, landfilling plastic produces leachate, leading to groundwater and soil pollution; incineration produces toxic gases such as carbon monoxide and dioxins. Furthermore, plastic waste causes severe ecological problems in the ocean, with many marine animals dying from ingesting plastic.

[0003] Recycled plastics refer to plastic raw materials obtained by processing waste plastics through physical or chemical methods such as pretreatment, melt granulation, and modification. They offer benefits such as improved resource utilization, reduced costs, and decreased greenhouse gas emissions.

[0004] Fly ash and polypropylene are industrial wastes that impact the Earth's environment. Fly ash is typically a byproduct of thermal power plants burning carbon and fossil fuels. Its main component is silicon dioxide, with small amounts of alumina, ferric oxide, sodium oxide, magnesium oxide, and potassium oxide. Current technology involves mixing fly ash and recycled polypropylene in a 1:1 ratio to prepare composite materials, thereby improving the composite's bending properties, water absorption, and thermal properties.

[0005] However, its performance still needs to be improved. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a high-toughness composite recycled plastic and its preparation method.

[0007] This invention is achieved through the following technical solution:

[0008] A high-toughness composite recycled plastic, characterized in that it comprises recycled polypropylene, KH550 modified TiO2 nanoparticles, and surface-treated fly ash; wherein the surface-treated fly ash is selected from one or more of isopropyl palmitate treated fly ash, furfuryl palmitate treated fly ash, ethyl myristate treated fly ash, and ethyl oleate treated fly ash.

[0009] Furthermore, the mass ratio of the recycled polypropylene, KH550 modified TiO2 nanoparticles, and surface-treated fly ash is 1:0.1~1:0.1~0.2, preferably 1:1:0.1.

[0010] Furthermore, the preparation method of the KH550 modified TiO2 nanoparticles is as follows: KH550 is dispersed in water and sonicated; then nano-titanium dioxide and ethanol are added and stirred; then centrifuged to obtain a precipitate, the precipitate is washed with deionized water, and the precipitate is vacuum dried to obtain KH550 modified TiO2 nanoparticles.

[0011] Furthermore, the surface-treated fly ash is selected from isopropyl palmitate-treated fly ash. The preparation method of the isopropyl palmitate-treated fly ash is as follows: acid-treated fly ash is soaked in an isopropyl palmitate-acetone solution and stirred at room temperature (25°C) for 30 min; then it is allowed to stand at room temperature (25°C) for 48 h, centrifuged to obtain a precipitate, and the precipitate is vacuum dried at 65°C for 12 h to obtain isopropyl palmitate-treated fly ash.

[0012] Furthermore, the concentration of the isopropyl palmitate acetone solution is 10–50 g / L, preferably 30 g / L.

[0013] Different concentrations of isopropyl palmitate acetone solution showed different effects on fly ash. After experimental comparison, 30 g / L was found to be the optimal concentration.

[0014] Furthermore, the method for preparing the acid-treated fly ash is as follows: fly ash is added to nitric acid, soaked at room temperature for 24 hours, then filtered, the precipitate is washed with deionized water, and the precipitate is vacuum dried to obtain acid-treated fly ash.

[0015] The present invention also provides a method for preparing a high-toughness composite recycled plastic, comprising the following steps: placing recycled polypropylene, surface-treated fly ash and KH550 modified TiO2 nanoparticles in a mixer, stirring at 180°C for 20 min, placing in a mold, maintaining a pressure of 2 MPa at 180°C for 10 min, maintaining the pressure unchanged, lowering the temperature to 90°C and holding for 2 h, and demolding after natural cooling to obtain a high-toughness composite recycled plastic.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] Based on existing technologies, isopropyl palmitate, furfuryl palmitate, ethyl myristate, and ethyl oleate were used to treat fly ash, which was then combined with KH550-TiO2 nanoparticles to further improve the mechanical properties of recycled polypropylene. Simultaneously, acid treatment further increased the number of hydroxyl groups on the fly ash surface, improving the interfacial adhesion between fly ash and recycled polypropylene, thus further enhancing its mechanical properties. Attached Figure Description

[0018] Figure 1 SEM image of fly ash treated with isopropyl palmitate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0020] Isopropyl palmitate, CAS 142-91-6.

[0021] Furfural palmitate, CAS 95668-36-3.

[0022] Ethyl myristate, CAS 124-06-1.

[0023] Ethyl oleate, CAS 111-62-6.

[0024] The fly ash was taken from a local power plant and its particle size is less than 0.075 mm.

[0025] Example 1

[0026] A high-toughness composite recycled plastic comprises recycled polypropylene, isopropyl palmitate treated fly ash, and KH550 modified TiO2 nanoparticles, wherein the mass ratio of recycled polypropylene, isopropyl palmitate treated fly ash, and KH550 modified TiO2 nanoparticles is 1:1:0.1.

[0027] The preparation method of isopropyl palmitate-treated fly ash is as follows: 10g of acid-treated fly ash is soaked in a 30g / L isopropyl palmitate-acetone solution and stirred for 30min at room temperature (25℃); then it is allowed to stand at room temperature (25℃) for 48h, centrifuged to obtain a precipitate, and the precipitate is vacuum dried at 65℃ for 12h to obtain isopropyl palmitate-treated fly ash. Figure 1 SEM image of fly ash treated with isopropyl palmitate.

[0028] The preparation method of acid-treated fly ash is as follows: 10g of fly ash is added to 1M nitric acid and soaked at room temperature for 24h. Then, it is filtered, the precipitate is washed with deionized water, and the precipitate is vacuum dried at 65℃ for 12h to obtain acid-treated fly ash.

[0029] A method for preparing a high-toughness composite recycled plastic: Recycled polypropylene, isopropyl palmitate treated fly ash, and KH550 modified TiO2 nanoparticles are placed in a mixer and stirred at 180°C for 20 min. The mixture is then placed in a mold and kept at 180°C and 2 MPa for 10 min. The pressure is maintained constant, the temperature is lowered to 90°C and held for 2 h. After natural cooling, the mixture is demolded to obtain a high-toughness composite recycled plastic.

[0030] The preparation method of KH550 modified TiO2 nanoparticles is as follows:

[0031] Disperse 0.25g of KH550 in 20mL of water and sonicate for 1h; then add 5g of nano-titanium dioxide and 100mL of ethanol and stir at 80℃ for 5h; then centrifuge to obtain precipitate, wash the precipitate with deionized water, and vacuum dry the precipitate at 65℃ for 12h to obtain KH550 modified nanoparticles TiO2.

[0032] Example 2

[0033] A high-toughness composite recycled plastic comprises recycled polypropylene, furfuryl palmitate treated fly ash, and KH550 modified TiO2 nanoparticles, wherein the mass ratio of recycled polypropylene, furfuryl palmitate treated fly ash, and KH550 modified TiO2 nanoparticles is 1:1:0.1.

[0034] The preparation method of furfuryl palmitate treated fly ash is as follows: 10g of acid-treated fly ash is soaked in 30g / L furfuryl palmitate acetone solution and stirred for 30min at room temperature (25℃); then it is allowed to stand at room temperature (25℃) for 48h, centrifuged to obtain precipitate, and the precipitate is vacuum dried at 65℃ for 12h to obtain furfuryl palmitate treated fly ash.

[0035] The preparation method of acid-treated fly ash is as follows: 10g of fly ash is added to 1M nitric acid and soaked at room temperature for 24h. Then, it is filtered, the precipitate is washed with deionized water, and the precipitate is vacuum dried at 65℃ for 12h to obtain acid-treated fly ash.

[0036] A method for preparing a high-toughness composite recycled plastic: Recycled polypropylene, fly ash treated with furfuryl palmitate, and KH550 modified TiO2 nanoparticles are placed in a mixer and stirred at 180°C for 20 min. The mixture is then placed in a mold and kept at 180°C and 2 MPa for 10 min. The pressure is maintained constant, the temperature is lowered to 90°C and held for 2 h. After natural cooling, the mixture is demolded to obtain a high-toughness composite recycled plastic.

[0037] The preparation method of KH550 modified TiO2 nanoparticles is as follows:

[0038] Disperse 0.25g of KH550 in 20mL of water and sonicate for 1h; then add 5g of nano-titanium dioxide and 100mL of ethanol and stir at 80℃ for 5h; then centrifuge to obtain precipitate, wash the precipitate with deionized water, and vacuum dry the precipitate at 65℃ for 12h to obtain KH550 modified nanoparticles TiO2.

[0039] Example 3

[0040] A high-toughness composite recycled plastic comprises recycled polypropylene, ethyl myristate treated fly ash, and KH550 modified TiO2 nanoparticles, wherein the mass ratio of recycled polypropylene, ethyl myristate treated fly ash, and KH550 modified TiO2 nanoparticles is 1:1:0.1.

[0041] The preparation method of fly ash treated with ethyl myristate is as follows: 10g of acid-treated fly ash is soaked in a 30g / L ethyl myristate acetone solution and stirred for 30min at room temperature (25℃); then it is allowed to stand at room temperature (25℃) for 48h, centrifuged to obtain a precipitate, and the precipitate is vacuum dried at 65℃ for 12h to obtain fly ash treated with ethyl myristate.

[0042] The preparation method of acid-treated fly ash is as follows: 10g of fly ash is added to 1M nitric acid and soaked at room temperature for 24h. Then, it is filtered, the precipitate is washed with deionized water, and the precipitate is vacuum dried at 65℃ for 12h to obtain acid-treated fly ash.

[0043] A method for preparing a high-toughness composite recycled plastic: Recycled polypropylene, myristate-treated fly ash, and H550 modified TiO2 nanoparticles are placed in a mixer and stirred at 180°C for 20 min. The mixture is then placed in a mold and kept at 180°C and 2 MPa for 10 min. The pressure is maintained constant, the temperature is lowered to 90°C and held for 2 h. After natural cooling, the mixture is demolded to obtain a high-toughness composite recycled plastic.

[0044] The preparation method of KH550 modified TiO2 nanoparticles is as follows:

[0045] Disperse 0.25g of KH550 in 20mL of water and sonicate for 1h; then add 5g of nano-titanium dioxide and 100mL of ethanol and stir at 80℃ for 5h; then centrifuge to obtain precipitate, wash the precipitate with deionized water, and vacuum dry the precipitate at 65℃ for 12h to obtain KH550 modified nanoparticles TiO2.

[0046] Example 4

[0047] A high-toughness composite recycled plastic comprises recycled polypropylene, ethyl oleate treated fly ash, and KH550 modified TiO2 nanoparticles, wherein the mass ratio of recycled polypropylene, ethyl oleate treated fly ash, and KH550 modified TiO2 nanoparticles is 1:1:0.1.

[0048] The preparation method of ethyl oleate treated fly ash is as follows: 10g of acid-treated fly ash is soaked in a 30g / L ethyl oleate acetone solution and stirred for 30min at room temperature (25℃); then it is allowed to stand at room temperature (25℃) for 48h, centrifuged to obtain a precipitate, and the precipitate is vacuum dried at 65℃ for 12h to obtain ethyl oleate treated fly ash.

[0049] The preparation method of acid-treated fly ash is as follows: 10g of fly ash is added to 1M nitric acid and soaked at room temperature for 24h. Then, it is filtered, the precipitate is washed with deionized water, and the precipitate is vacuum dried at 65℃ for 12h to obtain acid-treated fly ash.

[0050] A method for preparing a high-toughness composite recycled plastic: Recycled polypropylene, ethyl oleate treated fly ash, and KH550 modified TiO2 nanoparticles are placed in a mixer and stirred at 180°C for 20 min. The mixture is then placed in a mold and kept at 180°C and 2 MPa for 10 min. The pressure is maintained constant, the temperature is lowered to 90°C and held for 2 h. After natural cooling, the mixture is demolded to obtain a high-toughness composite recycled plastic.

[0051] The preparation method of KH550 modified TiO2 nanoparticles is as follows:

[0052] Disperse 0.25g of KH550 in 20mL of water and sonicate for 1h; then add 5g of nano-titanium dioxide and 100mL of ethanol and stir at 80℃ for 5h; then centrifuge to obtain precipitate, wash the precipitate with deionized water, and vacuum dry the precipitate at 65℃ for 12h to obtain KH550 modified nanoparticles TiO2.

[0053] Comparative Example 1

[0054] A high-toughness composite recycled plastic comprises recycled polypropylene, isopropyl palmitate treated fly ash, and KH550 modified TiO2 nanoparticles, wherein the mass ratio of recycled polypropylene, isopropyl palmitate treated fly ash, and KH550 modified TiO2 nanoparticles is 1:1:0.1.

[0055] The preparation method of isopropyl palmitate treated fly ash is as follows: 10g of fly ash is soaked in 30g / L isopropyl palmitate acetone solution and stirred at room temperature (25℃) for 30min; then it is allowed to stand at room temperature (25℃) for 48h, centrifuged to obtain precipitate, and the precipitate is vacuum dried at 65℃ for 12h to obtain isopropyl palmitate treated fly ash.

[0056] A method for preparing a high-toughness composite recycled plastic: Recycled polypropylene, isopropyl palmitate treated fly ash, and KH550 modified TiO2 nanoparticles are placed in a mixer and stirred at 180°C for 20 min. The mixture is then placed in a mold and kept at 180°C and 2 MPa for 10 min. The pressure is maintained constant, the temperature is lowered to 90°C and held for 2 h. After natural cooling, the mixture is demolded to obtain a high-toughness composite recycled plastic.

[0057] The preparation method of KH550 modified TiO2 nanoparticles is as follows:

[0058] Disperse 0.25g of KH550 in 20mL of water and sonicate for 1h; then add 5g of nano-titanium dioxide and 100mL of ethanol and stir at 80℃ for 5h; then centrifuge to obtain precipitate, wash the precipitate with deionized water, and vacuum dry the precipitate at 65℃ for 12h to obtain KH550 modified nanoparticles TiO2.

[0059] Comparative Example 2

[0060] A high-toughness composite recycled plastic comprises recycled polypropylene and isopropyl palmitate treated fly ash, wherein the mass ratio of recycled polypropylene to isopropyl palmitate treated fly ash is 1:1:0.1.

[0061] The preparation method of isopropyl palmitate treated fly ash is as follows: 10g of acid-treated fly ash is soaked in 30g / L isopropyl palmitate acetone solution and stirred at room temperature (25℃) for 30min; then it is allowed to stand at room temperature (25℃) for 48h, centrifuged to obtain precipitate, and the precipitate is vacuum dried at 65℃ for 12h to obtain isopropyl palmitate treated fly ash.

[0062] The preparation method of acid-treated fly ash is as follows: 10g of fly ash is added to 1M nitric acid and soaked at room temperature for 24h. Then, it is filtered, the precipitate is washed with deionized water, and the precipitate is vacuum dried at 65℃ for 12h to obtain acid-treated fly ash.

[0063] A method for preparing a high-toughness composite recycled plastic: Recycled polypropylene and fly ash treated with isopropyl palmitate are placed in a mixer and stirred at 180°C for 20 minutes. The mixture is then placed in a mold and kept at 180°C and 2 MPa for 10 minutes. The pressure is kept constant, the temperature is lowered to 90°C and held for 2 hours. After natural cooling, the mixture is demolded to obtain a high-toughness composite recycled plastic.

[0064] Test Example 1

[0065] The high-toughness composite recycled plastics obtained in each embodiment and comparative example had their flexural modulus measured according to ISO 178 and their impact strength tested according to ISO 179.

[0066] Table 1 Performance Test Comparison Table

[0067]

[0068] As shown in Table 1, and in conjunction with Examples 1 and 2-5, fly ash treated with isopropyl palmitate exhibits better impact strength and flexural modulus compared to furfuryl palmitate, ethyl myristate, and ethyl oleate. Furthermore, as shown in Examples 1 and Comparative Example 2, when fly ash treated with isopropyl palmitate is used in combination with KH550-modified TiO2 nanoparticles, the combined effect of both improves impact strength and flexural modulus. Comparative Example 1 also demonstrates that pre-acidification of fly ash, thereby increasing the number of hydroxyl groups on the fly ash surface, facilitates the modification of the fly ash and further enhances its performance.

[0069] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-toughness composite recycled plastic, characterized in that, Including recycled polypropylene, KH550 modified TiO2 nanoparticles, and surface-treated fly ash; The mass ratio of the recycled polypropylene, KH550 modified TiO2 nanoparticles, and surface-treated fly ash is 1:1:0.

1. The preparation method of KH550 modified TiO2 nanoparticles is as follows: KH550 is dispersed in water and sonicated; then nano-titanium dioxide and ethanol are added and stirred; then centrifuged to obtain a precipitate, the precipitate is washed with deionized water, and the precipitate is vacuum dried to obtain KH550 modified TiO2 nanoparticles; The surface-treated fly ash is selected from isopropyl palmitate-treated fly ash. The method for preparing isopropyl palmitate-treated fly ash is as follows: acid-treated fly ash is soaked in isopropyl palmitate-acetone solution and stirred at room temperature (25°C) for 30 min; then it is allowed to stand at room temperature (25°C) for 48 h, centrifuged to obtain precipitate, and the precipitate is vacuum dried at 65°C for 12 h to obtain isopropyl palmitate-treated fly ash. The method for preparing the acid-treated fly ash is as follows: fly ash is added to nitric acid, soaked at room temperature for 24 hours, then filtered, the precipitate is washed with deionized water, and the precipitate is vacuum dried to obtain acid-treated fly ash. The fly ash particle size is less than 0.075 mm.

2. The high-toughness composite recycled plastic according to claim 1, characterized in that, The concentration of isopropyl palmitate acetone solution is 10–50 g / L.

3. The high-toughness composite recycled plastic according to claim 2, characterized in that, The concentration of the isopropyl palmitate acetone solution is 30 g / L.

4. A method for preparing a high-toughness composite recycled plastic as described in any one of claims 1 to 3, characterized in that, The process includes the following steps: placing recycled polypropylene, surface-treated fly ash, and KH550 modified TiO2 nanoparticles into a mixer, stirring at 180°C for 20 minutes, placing the mixture in a mold, maintaining a pressure of 2MPa at 180°C for 10 minutes, keeping the pressure constant, lowering the temperature to 90°C and holding for 2 hours, and then demolding after natural cooling to obtain a high-toughness composite recycled plastic.

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