High-temperature-resistant light-weight polypropylene cup material and preparation method thereof

Abstract

The application provides a high-temperature-resistant light polypropylene cup material, which is prepared from the following components in parts by weight: polypropylene resin 60-65 parts, light stabilizer 0.5-0.8 parts, heat stabilizer 0.9-1.2 parts, lubricant 1-1.5 parts, antioxidant 0.2-0.5 parts, toughening agent 1.5-2 parts, filler 18-22 parts, and hydrophobic silica aerogel 10-14 parts. The application also provides a preparation method of the high-temperature-resistant light polypropylene cup material. The high-temperature-resistant light polypropylene cup material has good high-temperature resistance, impact resistance and light weight.

Description

Technical Field

[0001] This invention relates to a cup material, and more particularly to a high-temperature resistant lightweight polypropylene cup material and its preparation method. Background Technology

[0002] Commonly used cup materials include glass, ceramic, enamel, stainless steel, and plastic, each with its own advantages and disadvantages. Glass cups have good chemical stability and high-temperature resistance, but are relatively heavy, making them less portable and less flexible. Ceramic cups have good heat retention and stain resistance, but are fragile and have poor resistance to rapid temperature changes. Enameled cups have good high-temperature resistance, chemical inertness, and are easy to clean, but their enamel layer is easily damaged, posing a risk of heavy metal leaching, and they are prone to rusting and are not durable. Stainless steel cups are highly resistant to drops and corrosion, and have a longer lifespan than other cup materials, but they are relatively heavy, making them less portable, and their high thermal conductivity can cause burns. Plastic cups are not easily broken, are lightweight, and portable. Common plastic materials include polypropylene, Tritan, and polyphenylene sulfone. Polypropylene is a popular choice, but its high-temperature resistance and impact resistance are not ideal, and it carries the risk of softening, deformation, and cracking at high temperatures. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a high-temperature resistant and lightweight polypropylene cup material, which has good high-temperature resistance, impact resistance and is lightweight and portable.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0005] A high-temperature resistant, lightweight polypropylene cup material is prepared from the following components in parts by weight: 60-65 parts polypropylene resin, 0.5-0.8 parts light stabilizer, 0.9-1.2 parts heat stabilizer, 1-1.5 parts lubricant, 0.2-0.5 parts antioxidant, 1.5-2 parts toughening agent, 18-22 parts filler, and 10-14 parts hydrophobic silica aerogel.

[0006] Furthermore, the polypropylene resin described in this invention is a homopolymer polypropylene resin with a melt flow rate of 2-3 g / 10 min under test conditions of 230°C and 2.16 kg.

[0007] Furthermore, the light stabilizer described in this invention is light stabilizer 327.

[0008] Furthermore, the heat stabilizer of the present invention is composed of calcium adipic acid, zinc adipic acid, and pentaerythritol adipate in a mass ratio of 4:5:1.

[0009] Furthermore, the lubricant described in this invention is PP wax.

[0010] Furthermore, the antioxidant described in this invention is antioxidant 626.

[0011] Furthermore, the toughening agent of the present invention is ethyl 2-vinylbenzoate, and the filler is talc powder with an average particle size of 1-10 μm.

[0012] Furthermore, the hydrophobic silica aerogel of the present invention is prepared by the following steps:

[0013] A1. Mix tetraethyl orthosilicate, deionized water and anhydrous ethanol, stir for 15-20 minutes, adjust the pH value to 8 with ammonia, continue stirring for 2-3 hours, and let stand for 8-10 hours to obtain wet gel.

[0014] A2. Immerse the hydrogel obtained in step A1 in anhydrous ethanol and let it stand for 24 hours to obtain aged wet gel. Mix the aged wet gel, oxalic acid, and hexamethyldisilazane, stir for 30 minutes, and let it stand for 8-10 hours to obtain hydrophobic wet gel. Dry the hydrophobic wet gel to obtain hydrophobic silica aerogel.

[0015] Furthermore, in step A1 of the preparation of the hydrophobic silica aerogel of the present invention, the ratio of tetraethyl orthosilicate, deionized water, and anhydrous ethanol is 1 mol: 200 mL: 9 mol, the mass fraction of ammonia is 25%, and the stirring speed is 200 rpm; in step A2, the mass ratio of aged wet gel, oxalic acid, and hexamethyldisilazane is 1:1:3, the stirring speed is 200 rpm, the drying temperature is 100°C, and the drying time is 9-12 hours.

[0016] Another technical problem to be solved by the present invention is to provide a method for preparing the above-mentioned high-temperature resistant lightweight polypropylene cup material.

[0017] To solve the above technical problems, the technical solution is as follows:

[0018] A method for preparing a high-temperature resistant, lightweight polypropylene cup material includes the following steps:

[0019] B1. Weigh each component according to the weight percentage, add each component to the mixer, and stir at 500-600 rpm for 20-30 minutes to obtain the mixture;

[0020] B2. Add the mixture obtained in step B1 to a twin-screw extruder, melt extrude and granulate to obtain a high-temperature resistant lightweight polypropylene cup material; the length-to-diameter ratio of the twin-screw extruder is 36:1, the screw speed is 200 rpm, and the melting section temperature is 170-230℃.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The filler used in this invention, talc, can promote the crystallization process of polypropylene resin and increase its crystallinity, thereby improving the high temperature resistance and mechanical properties of the polypropylene cup material.

[0023] 2) In addition to its good thermal stabilizing effect, the zinc adipic acid in the heat stabilizer used in this invention can also improve the impact resistance of the polypropylene cup material.

[0024] 3) The toughening agent used in this invention, ethyl 2-vinylbenzoate, can enhance the mobility of polypropylene resin molecular chains, thereby improving the impact resistance of polypropylene resin.

[0025] 4) Silica aerogel has low density, thermal conductivity, and good high-temperature resistance. However, its surface is hydrophilic and its compatibility with polypropylene resin is poor. To address this, this invention uses tetraethyl orthosilicate as the silicon source, dissolves it, and adjusts the pH value with ammonia to form a wet gel. After aging the wet gel, it is surface modified with hexamethyldisilazane and other materials, and finally dried to obtain a hydrophobic silica aerogel with a hydrophobic surface. This hydrophobic silica aerogel has good compatibility with polypropylene resin, can effectively reduce the density of polypropylene cup material, and improve the high-temperature resistance of polypropylene cup material. Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0027] Example 1

[0028] The high-temperature resistant, lightweight polypropylene cup material is prepared from the following components in parts by weight: 63 parts polypropylene resin, 0.7 parts light stabilizer, 1.1 parts heat stabilizer, 1.4 parts lubricant, 0.4 parts antioxidant, 1.6 parts toughening agent, 20 parts filler, and 12 parts hydrophobic silica aerogel. The polypropylene resin is a homopolymer polypropylene resin with a melt flow rate of 3 g / 10 min under test conditions of 230℃ and 2.16 kg; the light stabilizer is light stabilizer 327; the heat stabilizer consists of calcium adipate, zinc adipate, and pentaerythritol adipate in a mass ratio of 4:5:1; the lubricant is PP wax; the antioxidant is antioxidant 626; the toughening agent is ethyl 2-vinylbenzoate; and the filler is talc powder with an average particle size of 5 μm.

[0029] Hydrophobic silica aerogel is prepared by the following steps:

[0030] A1. Mix tetraethyl orthosilicate, deionized water and anhydrous ethanol in a ratio of 1 mol: 200 mL: 9 mol, stir at 200 rpm for 18 minutes, adjust the pH value to 8 with 25% ammonia water, continue stirring for 2.5 hours and let stand for 9 hours to obtain wet gel.

[0031] A2. The hydrogel obtained in step A1 is immersed in anhydrous ethanol and allowed to stand for 24 hours to obtain an aged wet gel. The aged wet gel, oxalic acid and hexamethyldisilazane are mixed in a mass ratio of 1:1:3, stirred at 200 rpm for 30 minutes and allowed to stand for 9 hours to obtain a hydrophobic wet gel. The hydrophobic wet gel is dried at 100℃ for 10 hours to obtain a hydrophobic silica aerogel.

[0032] The preparation method of Example 1 includes the following steps:

[0033] B1. Weigh each component according to the weight percentage, add each component to the mixer, and stir at 600 rpm for 25 minutes to obtain the mixture;

[0034] B2. Add the mixture obtained in step B1 to a twin-screw extruder, melt extrude and granulate to obtain a high-temperature resistant lightweight polypropylene cup material; the length-to-diameter ratio of the twin-screw extruder is 36:1, the screw speed is 200 rpm, and the melting section temperature is 170-230℃.

[0035] Example 2

[0036] The high-temperature resistant, lightweight polypropylene cup material is prepared from the following components in parts by weight: 65 parts polypropylene resin, 0.8 parts light stabilizer, 1.2 parts heat stabilizer, 1.5 parts lubricant, 0.5 parts antioxidant, 2 parts toughening agent, 22 parts filler, and 14 parts hydrophobic silica aerogel. The polypropylene resin is a homopolymer polypropylene resin with a melt flow rate of 3 g / 10 min under test conditions of 230℃ and 2.16 kg; the light stabilizer is light stabilizer 327; the heat stabilizer consists of calcium adipate, zinc adipate, and pentaerythritol adipate in a mass ratio of 4:5:1; the lubricant is PP wax; the antioxidant is antioxidant 626; the toughening agent is ethyl 2-vinylbenzoate; and the filler is talc powder with an average particle size of 10 μm.

[0037] Hydrophobic silica aerogel is prepared by the following steps:

[0038] A1. Mix tetraethyl orthosilicate, deionized water and anhydrous ethanol in a ratio of 1mol:200mL:9mol, stir at 200 rpm for 20 minutes, adjust the pH value to 8 with 25% ammonia water, continue stirring for 3 hours and let stand for 10 hours to obtain wet gel.

[0039] A2. The hydrogel obtained in step A1 is immersed in anhydrous ethanol and allowed to stand for 24 hours to obtain an aged wet gel. The aged wet gel, oxalic acid and hexamethyldisilazane are mixed in a mass ratio of 1:1:3 and stirred at 200 rpm for 30 minutes. After standing for 10 hours, a hydrophobic wet gel is obtained. The hydrophobic wet gel is dried at 100°C for 12 hours to obtain a hydrophobic silica aerogel.

[0040] The preparation method of Example 2 includes the following steps:

[0041] B1. Weigh each component according to the weight percentage, add each component to the mixer, and stir at 500 rpm for 30 minutes to obtain the mixture;

[0042] B2. Add the mixture obtained in step B1 to a twin-screw extruder, melt extrude and granulate to obtain a high-temperature resistant lightweight polypropylene cup material; the length-to-diameter ratio of the twin-screw extruder is 36:1, the screw speed is 200 rpm, and the melting section temperature is 170-230℃.

[0043] Example 3

[0044] The high-temperature resistant, lightweight polypropylene cup material is prepared from the following components in parts by weight: 64 parts polypropylene resin, 0.6 parts light stabilizer, 1 part heat stabilizer, 1.2 parts lubricant, 0.3 parts antioxidant, 1.8 parts toughening agent, 21 parts filler, and 11 parts hydrophobic silica aerogel. The polypropylene resin is a homopolymer polypropylene resin with a melt flow rate of 2 g / 10 min under test conditions of 230℃ and 2.16 kg; the light stabilizer is light stabilizer 327; the heat stabilizer consists of calcium adipate, zinc adipate, and pentaerythritol adipate in a mass ratio of 4:5:1; the lubricant is PP wax; the antioxidant is antioxidant 626; the toughening agent is ethyl 2-vinylbenzoate; and the filler is talc powder with an average particle size of 1 μm.

[0045] Hydrophobic silica aerogel is prepared by the following steps:

[0046] A1. Mix tetraethyl orthosilicate, deionized water and anhydrous ethanol in a ratio of 1 mol: 200 mL: 9 mol, stir at 200 rpm for 16 minutes, adjust the pH value to 8 with 25% ammonia water, continue stirring for 2.5 hours and let stand for 9 hours to obtain wet gel.

[0047] A2. The hydrogel obtained in step A1 is immersed in anhydrous ethanol and allowed to stand for 24 hours to obtain an aged wet gel. The aged wet gel, oxalic acid and hexamethyldisilazane are mixed in a mass ratio of 1:1:3, stirred at 200 rpm for 30 minutes and allowed to stand for 8 hours to obtain a hydrophobic wet gel. The hydrophobic wet gel is dried at 100℃ for 9 hours to obtain a hydrophobic silica aerogel.

[0048] The preparation method of Example 3 includes the following steps:

[0049] B1. Weigh each component according to the weight percentage, add each component to the mixer, and stir at 500 rpm for 25 minutes to obtain the mixture;

[0050] B2. Add the mixture obtained in step B1 to a twin-screw extruder, melt extrude and granulate to obtain a high-temperature resistant lightweight polypropylene cup material; the length-to-diameter ratio of the twin-screw extruder is 36:1, the screw speed is 200 rpm, and the melting section temperature is 170-230℃.

[0051] Example 4

[0052] The high-temperature resistant, lightweight polypropylene cup material is prepared from the following components in parts by weight: 60 parts polypropylene resin, 0.5 parts light stabilizer, 0.9 parts heat stabilizer, 1 part lubricant, 0.2 parts antioxidant, 1.5 parts toughening agent, 18 parts filler, and 10 parts hydrophobic silica aerogel. The polypropylene resin is a homopolymer polypropylene resin with a melt flow rate of 2 g / 10 min under test conditions of 230℃ and 2.16 kg; the light stabilizer is light stabilizer 327; the heat stabilizer consists of calcium adipate, zinc adipate, and pentaerythritol adipate in a mass ratio of 4:5:1; the lubricant is PP wax; the antioxidant is antioxidant 626; the toughening agent is ethyl 2-vinylbenzoate; and the filler is talc powder with an average particle size of 8 μm.

[0053] Hydrophobic silica aerogel is prepared by the following steps:

[0054] A1. Mix tetraethyl orthosilicate, deionized water and anhydrous ethanol in a ratio of 1mol:200mL:9mol, stir at 200 rpm for 15 minutes, adjust the pH value to 8 with 25% ammonia water, continue stirring for 2 hours and let stand for 8 hours to obtain wet gel.

[0055] A2. The hydrogel obtained in step A1 is immersed in anhydrous ethanol and allowed to stand for 24 hours to obtain an aged wet gel. The aged wet gel, oxalic acid and hexamethyldisilazane are mixed in a mass ratio of 1:1:3, stirred at 200 rpm for 30 minutes and allowed to stand for 9 hours to obtain a hydrophobic wet gel. The hydrophobic wet gel is dried at 100℃ for 11 hours to obtain a hydrophobic silica aerogel.

[0056] The preparation method of Example 4 includes the following steps:

[0057] B1. Weigh each component according to the weight percentage, add each component to the mixer, and stir at 600 rpm for 20 minutes to obtain the mixture;

[0058] B2. Add the mixture obtained in step B1 to a twin-screw extruder, melt extrude and granulate to obtain a high-temperature resistant lightweight polypropylene cup material; the length-to-diameter ratio of the twin-screw extruder is 36:1, the screw speed is 200 rpm, and the melting section temperature is 170-230℃.

[0059] Comparative Example 1:

[0060] The difference from Example 1 is that the heat stabilizer in the component consists of calcium adipic acid and pentaerythritol adipate in a mass ratio of 4:1, that is, the heat stabilizer does not contain zinc adipic acid.

[0061] Comparative Example 2:

[0062] The difference from Example 1 is that the toughening agent, ethyl 2-vinylbenzoate, is not included in the components.

[0063] Comparative Example 3:

[0064] The difference from Example 1 is that the components do not include talc.

[0065] Comparative Example 4:

[0066] The difference from Example 1 is that the components do not include hydrophobic silica aerogel, thus omitting its preparation step.

[0067] Experiment Example 1: High Temperature Resistance Test

[0068] The heat distortion temperature of the polypropylene cup materials prepared in Examples 1-4 and Comparative Examples 2-4 were determined according to GB / T 1634-2019 standard, with a test pressure of 0.45 MPa. A higher heat distortion temperature indicates better high-temperature resistance. The test results are shown in Table 1.

[0069] Heat distortion temperature (°C) Example 1 145 Example 2 149 Example 3 144 Example 4 141 Comparative Example 2 138 Comparative Example 3 122 Comparative Example 4 135

[0070] Table 1

[0071] As shown in Table 1, the heat distortion temperatures of Examples 1-4 of this invention are all relatively high, indicating that the high-temperature resistant lightweight polypropylene cup material prepared by this invention has good high-temperature resistance. Some components and preparation steps of Comparative Examples 2-4 differ from those of Example 1. Compared with Example 1, the heat distortion temperature of Comparative Example 3 is significantly lower, indicating that the talc powder used in this invention can greatly improve the high-temperature resistance of the polypropylene cup material. Compared with Example 1, the heat distortion temperatures of Comparative Examples 2 and 4 are also lower, indicating that the toughening agent—ethyl 2-vinylbenzoate—and the hydrophobic silica aerogel used in this invention can also improve the high-temperature resistance of the polypropylene cup material.

[0072] Experiment Example 2: Density Test

[0073] The densities of the polypropylene cup materials prepared in Examples 1-4 and Comparative Example 4 were determined according to GB / T 1033.1-2008 standard. The test temperature was 23℃, and the test results are shown in Table 2.

[0074] Density (g / cm³) Example 1 0.759 Example 2 0.745 Example 3 0.768 Example 4 0.770 Comparative Example 4 0.912

[0075] Table 2

[0076] As shown in Table 2, the densities of Examples 1 to 4 of the present invention are all low, indicating that the high-temperature resistant lightweight polypropylene cup material prepared by the present invention is lightweight and portable. Comparative Example 4 differs from Example 1 in some components and preparation steps. Compared with Example 1, the density of Comparative Example 4 is significantly higher, indicating that the hydrophobic silica aerogel used in the present invention can effectively reduce the density of the polypropylene cup material.

[0077] Experiment Example 3: Impact Resistance Test

[0078] The notched impact strength of the polypropylene cup materials prepared in Examples 1-4 and Comparative Examples 1-2 was determined according to GB / T 1843-2008 standard at a test temperature of 23℃. Higher notched impact strength indicates better impact resistance. The test results are shown in Table 3.

[0079] Notched impact strength (kJ / m²) Example 1 13.5 Example 2 13.8 Example 3 13.6 Example 4 13.3 Comparative Example 1 12.4 Comparative Example 2 10.9

[0080] Table 3

[0081] As shown in Table 3, the notched impact strengths of Examples 1-4 of the present invention are all relatively high, indicating that the high-temperature resistant lightweight polypropylene cup material prepared by the present invention has good impact resistance. Some components of Comparative Examples 1-2 differ from those of Example 1. Compared with Example 1, the notched impact strength of Comparative Example 2 is significantly lower, indicating that the toughening agent used in the present invention—ethyl 2-vinylbenzoate—can greatly improve the impact resistance of the polypropylene cup material. Compared with Example 1, the notched impact strength of Comparative Example 1 is also lower, indicating that the zinc oxalate in the heat stabilizer used in the present invention can also improve the impact resistance of the polypropylene cup material.

[0082] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A high temperature resistant, lightweight polypropylene cup material, characterized by: It is prepared from the following components by weight parts: polypropylene resin 60-65 parts, light stabilizer 0.5-0.8 parts, heat stabilizer 0.9-1.2 parts, lubricant 1-1.5 parts, antioxidant 0.2-0.5 parts, toughening agent 1.5-2 parts, filler 18-22 parts, hydrophobic silica aerogel 10-14 parts; the heat stabilizer is composed of calcium adipate, zinc adipate and pentaerythritol adipate with a mass ratio of 4:5:1; the toughening agent is 2-vinyl-ethyl benzoate, and the filler is talc powder with an average particle size of 1-10 μm The hydrophobic silica aerogel is prepared by the following steps: A1. Mix tetraethyl orthosilicate, deionized water and anhydrous ethanol, stir for 15-20 minutes, then adjust the pH value to 8 with ammonia water, continue to stir for 2-3 hours, and then stand for 8-10 hours to obtain a wet gel; A2. Soak the wet gel obtained in step A1 in anhydrous ethanol, stand for aging for 24 hours to obtain an aged wet gel, mix the aged wet gel, oxalic acid and hexamethyldisilazane, stir for 30 minutes, then stand for 8-10 hours to obtain a hydrophobic wet gel, and dry the hydrophobic wet gel to obtain a hydrophobic silica aerogel.

2. The high temperature resistant, lightweight polypropylene cup material of claim 1, wherein: The polypropylene resin is a homopolymer polypropylene resin with a melt flow rate of 2-3 g / 10 min under the test conditions of 230℃ and 2.16 kg.

3. The high temperature resistant, lightweight polypropylene cup material of claim 1, wherein: The light stabilizer is light stabilizer 327.

4. The high temperature resistant, lightweight polypropylene cup material of claim 1, wherein: The lubricant is PP wax.

5. The high temperature resistant, lightweight polypropylene cup material of claim 1, wherein: The antioxidant is antioxidant 626.

6. The high temperature resistant, lightweight polypropylene cup material of claim 1, wherein: In step A1 of the preparation of the hydrophobic silica aerogel, the ratio of tetraethyl orthosilicate, deionized water and anhydrous ethanol is 1 mol:200 mL:9 mol, the mass fraction of ammonia water is 25%, and the stirring speed is 200 revolutions / min; in step A2, the mass ratio of the aged wet gel, oxalic acid and hexamethyldisilazane is 1:1:3, the stirring speed is 200 revolutions / min, the drying temperature is 100℃, and the drying time is 9-12 hours.

7. The method according to any one of claims 1 to 6, characterized in that: It comprises the following steps: B1. Take each component by weight parts, add each component to a mixer, and stir at a speed of 500-600 revolutions / min for 20-30 minutes to obtain a mixture; B2. Add the mixture obtained in step B1 to a twin-screw extruder, melt extrude and then pelletize to obtain a high-temperature-resistant lightweight polypropylene cup material; the length-diameter ratio of the twin-screw extruder is 36:1, the screw rotation speed is 200 revolutions / min, and the melting section temperature is 170-230℃.