A high-gloss, low-warpage polypropylene composition and its preparation method

Abstract

This invention relates to a high-gloss, low-warpage polypropylene composition. The composition, by weight, comprises: 100 parts homopolymer polypropylene; 0.5-3.0 parts deep eutectic solvent; 0.03-0.1 parts antioxidant; 0.03-0.06 parts acid scavenger; 0.02-0.06 parts α-nucleating agent; 0.02-0.06 parts β-nucleating agent; and 0-0.60 parts inorganic filler. The polypropylene resin prepared by this invention possesses high gloss, low warpage, high heat resistance, and maintains its impact strength. This invention utilizes a synergistic additive system combining deep eutectic solvent, α-nucleating agent, β-nucleating agent, and inorganic filler to control the polypropylene resin to possess α and β crystal forms, significantly improving the gloss and heat resistance of the product, significantly reducing the shrinkage rate, and maintaining its toughness.

Description

Technical Field

[0001] This invention relates to a polypropylene resin composition, and more particularly to a high-gloss, low-warpage polypropylene composition and its preparation method. Background Technology

[0002] Polypropylene (PP), as a widely produced and applied general-purpose polymer material, possesses excellent mechanical properties, processability, solvent resistance, electrical insulation, and cost advantages, making it widely used in the automotive, electronics, and packaging industries. With the increasing sophistication of the home appliance industry, higher demands are being placed on the gloss, dimensional stability, and low warpage properties of polypropylene materials. Ordinary homopolymer polypropylene has a flexural modulus of approximately 1500 MPa and relatively low rigidity; its gloss is only 40-60, and its heat distortion temperature under load is 85-95℃, making it difficult to simultaneously meet the requirements of high gloss and high rigidity. Furthermore, polypropylene has high crystallinity and a regular structure, resulting in a molding shrinkage rate of 1.6%-2.0%, with high isotactic polypropylene reaching up to 2.5%, which can easily lead to poor dimensional accuracy in products. Uneven shrinkage in the flow direction (MD) and perpendicular to the flow direction (TD) can easily cause warpage, deformation, and even breakage, severely limiting its application in precision components such as home appliance casings.

[0003] Currently, inorganic fillers such as talc and glass fiber are commonly used to reduce shrinkage and suppress warping. However, this leads to decreased surface gloss and impact resistance, increased melt viscosity and product density, and poor compatibility and weak interfacial bonding between inorganic fillers and the polypropylene matrix, making it difficult to meet the high appearance and high performance requirements of household appliance casings. While controlling the polypropylene crystal form and structure can reduce shrinkage to some extent, existing technologies still have significant shortcomings: a Chinese patent for a high-gloss, heat-resistant polypropylene resin composition (patent number CN101190988B) achieves high gloss and heat resistance, but it does not address shrinkage and warping control, resulting in poor dimensional stability; another Chinese patent for a method of preparing a wide molecular weight distribution heat-resistant, high-rigidity, transparent, low-shrinkage homopolymer polypropylene resin (patent number CN112280167A) uses an α-nucleating agent, but still suffers from high shrinkage, uneven MD / TD shrinkage, and easy warping. In summary, existing technologies struggle to achieve synergistic optimization of high gloss and low warping, some components lack environmental friendliness, and interfacial compatibility is poor, failing to meet the application requirements of high-end household appliance materials. Summary of the Invention

[0004] To address the shortcomings of the prior art, the present invention provides a high-gloss, low-warpage polypropylene composition, which features high gloss, low warpage, good heat resistance, and maintains its toughness.

[0005] This invention provides a high-gloss, low-warpage polypropylene composition, wherein the raw material composition, by weight, comprises: 100 parts of homopolymer polypropylene Deep eutectic solvent: 0.5-3.0 parts Antioxidant 0.03-0.1 parts Acid absorbent 0.03-0.06 parts α-nucleating agent 0.02-0.06 parts 0.02-0.06 parts of β-nucleating agent Inorganic filler 0-0.60 parts.

[0006] Furthermore, the technical specifications of the homopolymer polypropylene are as follows: Melt mass flow rate (2.16 kg, 190℃): 3-30 g / 10 min Isotacticity 96-99.5%.

[0007] Furthermore, the deep eutectic solvent DES includes one of choline chloride-glycerol, choline chloride-ethylene glycol, choline chloride-urea, and choline chloride-acetic acid binary DES.

[0008] Furthermore, the deep eutectic solvent DES includes one of choline chloride-ethylene glycol-urea and choline chloride-glycerol-citric acid ternary DES.

[0009] Furthermore, the antioxidants are BASF antioxidants Irganox 1010 and Irganox 168.

[0010] Furthermore, the acid absorbent is one of calcium stearate or hydrotalcite.

[0011] Furthermore, the α-nucleating agent is one of the following: organic non-aryl carboxylate salts, organic phosphate salts, and disproportionated rosin salts. Preferably, the α-nucleating agent is one of the following commercial products: RY-2007, HPN-715, or HPN-68L.

[0012] Furthermore, the β-nucleating agent is one of alicyclic dicarboxylate, rare earth, or polycyclic aromatic hydrocarbon compounds. Preferably, the β-nucleating agent is one of the commercially available WBG-2 or NAB-82.

[0013] Furthermore, the inorganic filler is preferably one of barium sulfate or talc.

[0014] This invention also provides a method for preparing a high-gloss, low-warpage polypropylene composition, the method comprising the following steps: The raw materials of the above composition are added into a high-speed mixer in proportion. The high-speed mixer is started and mixed for 5 minutes. The mixture is then discharged, sealed and stored for extrusion granulation. The high-gloss, low-warpage polypropylene composition of this invention was prepared by using a twin-screw extruder under the following extrusion granulation conditions: extrusion temperature 180-210℃, screw speed 200rpm, and feeding speed 15 kg / h.

[0015] Beneficial effects: (1) The polypropylene resin prepared by the present invention has the properties of high gloss, low warpage, high heat resistance and maintaining impact strength without decrease;

[0016] (2) The present invention selects a synergistic additive system of deep eutectic solvent, α nucleating agent, β nucleating agent and inorganic filler to control polypropylene resin to have α and β crystal forms, greatly improve the gloss and heat resistance of the product, significantly reduce the shrinkage rate of the product, and at the same time maintain the toughness. Detailed Implementation

[0017] To address the challenges of synergistically optimizing gloss, heat resistance, shrinkage, and warpage in existing polypropylene materials, as well as the poor compatibility, decreased gloss, and reduced toughness resulting from inorganic filler modification, this invention aims to overcome these shortcomings by providing a polypropylene material based on deep eutectic solvent (DES) synergistic modification. This invention leverages the advantages of DES—its environmental friendliness, strong crystallization control capabilities, and good interfacial compatibility—to significantly improve gloss and heat resistance, effectively reduce molding shrinkage and warpage, while maintaining excellent mechanical properties and processing fluidity. This meets the urgent needs of high-end sectors such as home appliances for high-performance, environmentally friendly, and dimensionally stable polypropylene materials, achieving a breakthrough in comprehensive performance characteristics including high gloss, high heat resistance, low shrinkage, and low warpage.

[0018] The high-gloss, low-warpage polypropylene composition of the present invention uses homopolymer polypropylene as the matrix resin. By adding deep eutectic solvent DES, antioxidant, acid scavenger, α nucleating agent, β nucleating agent and inorganic filler and other additives to it, the high-gloss, high-rigidity, heat-resistant and low-warpage polypropylene is prepared by extrusion granulation after blending with homopolymer polypropylene. The extrusion granulation temperature is 180-210℃.

[0019] The following specific examples further illustrate this point. Example 1

[0020] Accurately weigh 100 parts of homopolymer polypropylene (3 kg total), 0.05 parts of antioxidant (Irganox 1010) and 0.025 parts of antioxidant (Irganox 168) (2.25 g total), 0.05 parts of acid scavenger (calcium stearate) (1.5 g total), 1.5 parts of choline chloride-glycerol (45 g total), 0.03 parts of α-nucleating agent (HPN-715) (0.9 g total), 0.02 parts of β-nucleating agent (WBG-2) (0.6 g total), and 0.5 parts of inorganic filler (barium sulfate) (15 g total). Add these to a high-speed mixer, start the high-speed mixer, mix for 5 minutes, discharge, seal and store for extrusion granulation. Use a twin-screw extruder, and the extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed: 200 rpm, feed rate 15 kg / h. The high-gloss, low-warpage polypropylene of this invention is obtained, and the performance test results are shown in Table 1. Example 2

[0021] Accurately weigh 100 parts of homopolymer polypropylene (3 kg total), 0.05 parts of antioxidant (Irganox 1010) and 0.025 parts of antioxidant (Irganox 168) (2.25 g total), 0.05 parts of acid scavenger (calcium stearate) (1.5 g total), 1.5 parts of choline chloride-urea (45 g total), 0.03 parts of α-nucleating agent (RY-2007) (0.9 g total), 0.02 parts of β-nucleating agent (WBG-2) (0.6 g total), and 0.5 parts of inorganic filler (barium sulfate) (15 g total). Add these to a high-speed mixer, start the high-speed mixer, mix for 5 minutes, discharge, seal and store for extrusion granulation. Use a twin-screw extruder, and the extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed: 200 rpm, feed rate 15 kg / h. The high-gloss, low-warpage polypropylene of this invention is obtained, and the performance test results are shown in Table 1. Example 3

[0022] Accurately weigh 3 kg of homopolymer polypropylene (100 parts), 2.25 g of antioxidant (Irganox 1010) and 0.025 g of antioxidant (Irganox 168), 1.5 g of acid scavenger (calcium stearate), 45 g of choline chloride-ethylene glycol-urea mixture (1.5 parts), 0.9 g of α-nucleating agent (HPN-68L), 0.6 g of β-nucleating agent (NAB-82), and 15 g of inorganic filler (5000 mesh talc). Add these to a high-speed mixer, start the mixer, mix for 5 minutes, then discharge the material, seal and store for extrusion granulation. Use a twin-screw extruder. The extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed 200 rpm, feed rate 15... The high-gloss, low-warpage polypropylene of this invention was prepared by using kg / h, and the performance test results are shown in Table 1. Example 4

[0023] Accurately weigh 100 parts of homopolymer polypropylene (3 kg total), 0.05 parts of antioxidant (Irganox 1010) and 0.025 parts of antioxidant (Irganox 168) (2.25 g total), 0.05 parts of acid scavenger (calcium stearate) (1.5 g total), 0.5 parts of choline chloride-ethylene glycol (15 g total), 0.04 parts of α-nucleating agent (RY-2007) (1.2 g total), 0.03 parts of β-nucleating agent (WBG-2) (0.9 g total), and 0.5 parts of inorganic filler (barium sulfate) (15 g total). Add these to a high-speed mixer, start the high-speed mixer, mix for 5 minutes, discharge, seal and store for extrusion granulation. Use a twin-screw extruder, and the extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed: 200 rpm, feed rate 15 kg / h. The high-gloss, low-warpage polypropylene of this invention is obtained, and the performance test results are shown in Table 1. Example 5

[0024] Accurately weigh 100 parts of homopolymer polypropylene (3 kg total), 0.05 parts of antioxidant (Irganox 1010) and 0.025 parts of antioxidant (Irganox 168) (2.25 g total), 0.05 parts of acid scavenger (calcium stearate) (1.5 g total), 0.5 parts of choline chloride-citric acid (15 g total), 0.05 parts of α-nucleating agent (HPN-715) (1.5 g total), 0.03 parts of β-nucleating agent (WBG-2) (0.9 g total), and 0.5 parts of inorganic filler (barium sulfate) (15 g total). Add these to a high-speed mixer, start the high-speed mixer, mix for 5 minutes, discharge, seal and store for extrusion granulation. Use a twin-screw extruder, and the extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed: 200 rpm, feed rate 15 kg / h. The high-gloss, low-warpage polypropylene of this invention is obtained, and the performance test results are shown in Table 1. Example 6

[0025] Accurately weigh 3 kg of homopolymer polypropylene (100 parts), 2.25 g of antioxidant (Irganox 1010) and 0.025 g of antioxidant (Irganox 168), 1.5 g of acid scavenger (calcium stearate) (0.05 parts), 90 g of choline chloride-acetic acid (3.0 parts), 0.6 g of α-nucleating agent (HPN-68L) (0.02 parts), 0.6 g of β-nucleating agent (NAB-82) (0.02 parts), and 18 g of inorganic filler (5000 mesh talc powder) (0.6 parts). Add these to a high-speed mixer, start the mixer, mix for 5 minutes, then discharge the material, seal and store for extrusion granulation. Use a twin-screw extruder. The extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed 200 rpm, feed rate 15... The high-gloss, low-warpage polypropylene of this invention was prepared by using kg / h, and the performance test results are shown in Table 1. Example 7

[0026] Accurately weigh 100 parts of homopolymer polypropylene (3 kg total), 0.05 parts of antioxidant (Irganox 1010) and 0.025 parts of antioxidant (Irganox 168) (2.25 g total), 0.05 parts of acid scavenger (calcium stearate) (1.5 g total), 3.0 parts of choline chloride-urea (90 g total), 0.02 parts of α-nucleating agent (RY-2007) (0.6 g total), 0.02 parts of β-nucleating agent (NAB-82) (0.6 g total), and 0.5 parts of inorganic filler (barium sulfate) (15 g total). Add these to a high-speed mixer, start the high-speed mixer, mix for 5 minutes, discharge, seal and store for extrusion granulation. Use a twin-screw extruder, and the extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed: 200 rpm, feed rate 15 kg / h. The high-gloss, low-warpage polypropylene of this invention is obtained, and the performance test results are shown in Table 1. Example 8

[0027] Accurately weigh 3 kg of homopolymer polypropylene (100 parts), 2.25 g of antioxidant (Irganox 1010) and 0.025 g of antioxidant (Irganox 168), 1.5 g of acid scavenger (calcium stearate) (0.05 parts), 90 g of choline chloride-glycerol-citric acid (3.0 parts), 0.6 g of α-nucleating agent (HPN-715) (0.02 parts), 0.6 g of β-nucleating agent (NAB-82) (0.02 parts), and 15 g of inorganic filler (barium sulfate) (0.5 parts). Add these to a high-speed mixer, start the mixer, mix for 5 minutes, then discharge the material, seal and store for extrusion granulation. Use a twin-screw extruder. The extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed 200 rpm, feed rate 15... The high-gloss, low-warpage polypropylene of this invention was prepared by using kg / h, and the performance test results are shown in Table 1.

[0028] Comparative Example 1: Accurately weigh 3 kg of homopolymer polypropylene (100 parts), 2.25 g of antioxidant (Irganox 1010) and antioxidant (Irganox 168) (0.025 parts), and 1.5 g of acid scavenger (calcium stearate) (0.05 parts). Add these to a high-speed mixer, start the mixer, mix for 5 minutes, discharge, seal and store for extrusion granulation. Use a twin-screw extruder. The extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed 200 rpm, feed rate 15 kg / h. The performance test results of the obtained polypropylene composition are shown in Table 1.

[0029] Comparative Example 2: Accurately weigh 100 parts of homopolymer polypropylene (3 kg total), 0.05 parts of antioxidant (Irganox 1010) and 0.025 parts of antioxidant (Irganox 168) (2.25 g total), 0.05 parts of acid scavenger (calcium stearate) (1.5 g total), 0.03 parts of α-nucleating agent (HPN-715) (0.9 g total), 0.02 parts of β-nucleating agent (WBG-2) (0.6 g total), and 0.5 parts of inorganic filler (barium sulfate) (15 g total). Add these to a high-speed mixer, start the high-speed mixer, mix for 5 minutes, discharge, seal and store for extrusion granulation. Use a twin-screw extruder. The extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed: 200 rpm, feeding speed 15 kg / h. The performance test results of the obtained polypropylene composition are shown in Table 1.

[0030] Comparative Example 3: Accurately weigh 100 parts of homopolymer polypropylene (3 kg total), 0.05 parts of antioxidant (Irganox 1010) and 0.025 parts of antioxidant (Irganox 168) (2.25 g total), 0.05 parts of acid scavenger (calcium stearate) (1.5 g total), 1.5 parts of choline chloride-urea (45 g total), 0.02 parts of β-nucleating agent (WBG-2) (0.6 g total), and 0.5 parts of inorganic filler (barium sulfate) (15 g total). Add these to a high-speed mixer, start the high-speed mixer, mix for 5 minutes, discharge, seal and store for extrusion granulation. Use a twin-screw extruder. The extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed: 200 rpm, feed rate 15 kg / h. The performance test results of the obtained polypropylene composition are shown in Table 1.

[0031] Comparative Example 4: Accurately weigh 100 parts of homopolymer polypropylene (3 kg total), 0.05 parts of antioxidant (Irganox 1010) and 0.025 parts of antioxidant (Irganox 168) (2.25 g total), 0.05 parts of acid scavenger (calcium stearate) (1.5 g total), 1.5 parts of choline chloride-glycerol chloride (45 g total), 0.03 parts of α-nucleating agent (HPN-715) (0.9 g total), and 0.5 parts of inorganic filler (barium sulfate) (15 g total). Add these to a high-speed mixer, start the high-speed mixer, mix for 5 minutes, discharge, seal and store for extrusion granulation. Use a twin-screw extruder. The extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed: 200 rpm, feed rate 15 kg / h. The performance test results of the obtained polypropylene composition are shown in Table 1.

[0032] Comparative Example 5: Accurately weigh 100 parts of homopolymer polypropylene (3 kg total), 0.05 parts of antioxidant (Irganox 1010) and 0.025 parts of antioxidant (Irganox 168) (2.25 g total), 0.05 parts of acid scavenger (calcium stearate) (1.5 g total), 1.5 parts of choline chloride-ethylene glycol-urea (45 g total), 0.02 parts of α-nucleating agent (HPN-68L) (0.6 g total), and 0.5 parts of inorganic filler (barium sulfate) (15 g total). Add these to a high-speed mixer, start the high-speed mixer, mix for 5 minutes, discharge, seal and store for extrusion granulation. Use a twin-screw extruder. The extrusion granulation process conditions are as follows: extrusion temperature 180-210℃, screw speed: 200 rpm, feed rate 15 kg / h. The performance test results of the obtained polypropylene composition are shown in Table 1.

[0033] Table 1 Performance Test Results

[0034] The performance data of the products in the embodiments and comparative examples adopted the following test standards: (1) Melt mass flow rate (MFR): Measured according to GB / T3682, at a temperature of 230℃ and a load of 2.16kg.

[0035] (2) Flexural modulus: determined according to GB / T 9341.

[0036] (3) Gloss: Measured according to GB / T 8807.

[0037] (4) Load deformation temperature: determined according to GB / T 1634.2, with a load of 0.45MPa.

[0038] (5) Shrinkage rate: determined according to GB / T 17037.4.

[0039] (6) Impact strength: determined according to GB / T 1843.

[0040] As can be seen from the results in Table 1, and from the test results of Examples 1-8 and the comparative examples, the present invention utilizes small amounts of deep eutectic solvents, α-nucleating agents, and β-nucleating agents to achieve high gloss, heat resistance, and low warpage characteristics. Specifically, the polypropylene resin prepared by the present invention has a flexural modulus higher than 2000 MPa, a gloss level higher than 100% at 60°C, a heat distortion temperature under load (0.45 MPa) higher than 130°C, a transverse shrinkage rate lower than 1.25%, and a longitudinal shrinkage rate lower than 1.20%. The high-gloss, heat-resistant, and low-warpage polypropylene composition of the present invention possesses characteristics such as high gloss, low warpage, good heat resistance, and maintained toughness.

[0041] Polypropylene has multiple crystal forms, including α, β, and γ. α crystals are thermodynamically stable, have high strength and modulus, and are easily formed under conventional processing conditions. β crystals are metastable, exhibiting superior toughness and heat resistance, and their density (approximately 0.916 g / cm³) is significantly lower than that of α crystals (approximately 0.936 g / cm³). By controlling the crystal structure of polypropylene and increasing the β crystal content, the linear shrinkage and volume shrinkage of iPP injection molded products can be significantly reduced, thus improving molding warpage.

[0042] This invention ingeniously utilizes the deep eutectic solvent (DES) synergistic modification mechanism to form secondary hydrogen bonds with the weakly polar groups of the polypropylene molecular chain, thereby regulating the chain segment conformation and enhancing intermolecular forces. Simultaneously, it acts as a heterogeneous nucleation site, increasing nucleation density, inducing β-crystal formation, refining spherulites, and optimizing crystallization kinetics, thereby improving heat resistance and reducing shrinkage and warpage. Furthermore, DES can form an interfacial transition layer between nonpolar PP and polar components such as antioxidants, acid scavengers, α-nucleating agents, β-nucleating agents, and inorganic fillers, improving interfacial compatibility, inhibiting filler agglomeration, and inducing shear bands and crazing to construct a physically cross-linked multi-network structure, achieving toughening, improved melt strength, and enhanced processing fluidity, thus synergistically improving the overall performance of the material.

[0043] DES mechanism of action; The modification mechanism of deep eutectic solvent (DES) on polypropylene (PP) from three dimensions—molecular interaction, nucleation regulation, and interfacial compatibility—is as follows: (1) Construction and regulation of intermolecular hydrogen bond networks Deep eutectic solvents consist of hydrogen bond donors (such as polyols, carboxylic acids, and amides) and hydrogen bond acceptors (such as quaternary ammonium salts and metal salts), and their core characteristic is the formation of a dynamically reversible hydrogen bond network. In the modification of polypropylene: The hydrogen bond donors / acceptors of DES can form secondary hydrogen bonds with weakly polar groups (such as methyl and methylene) on the PP molecular chain, enhancing intermolecular forces. This hydrogen bond interaction can regulate the conformation of the PP molecular chain, reduce chain segment movement resistance, and improve the flexibility of the material. In addition, the dynamic hydrogen bond network endows the material with self-healing ability, and the hydrogen bonds can be reformed when damaged by external forces.

[0044] (2) Heterogeneous nucleation and regulation of crystallization behavior Heterogeneous nucleation sites are provided: the composite structure formed by DES molecular clusters and PP can act as a heterogeneous nucleation agent, increasing the density of crystal nucleation sites and inducing the formation of β crystal form (while maintaining toughness). Crystallization morphology control: By controlling the composition and amount of DES, PP can be guided to form a finer and more uniform spherulite structure, thereby improving the transparency and mechanical properties of the material. Crystallization kinetics optimization: The presence of DES can accelerate the crystallization rate of PP, shorten the processing cycle, and at the same time improve the crystallinity, improve the heat resistance and dimensional stability of the material, and reduce shrinkage and warpage.

[0045] (3) Interface compatibility improvement and toughening mechanism Interface compatibilization effect: The polar groups of DES can form an interface layer between non-polar PP and polar fillers. One end is bonded to the polypropylene surface through van der Waals forces, and the other end interacts with the filler surface through hydrogen bonds, which significantly reduces interfacial tension, improves interphase adhesion, reduces interface defects, reduces filler agglomeration, and improves the thermodynamic and optical properties of the material.

[0046] Shear band and crazing control: The addition of DES can promote the formation of more shear bands and crazing in the material under stress, effectively absorbing impact energy; Multiple network structure construction: DES can form physical cross-linking points with PP molecular chains to construct a multiple network structure, which can dissociate at high temperatures, giving the material good processing fluidity; after cooling, it reforms, which can improve the melt strength and creep resistance of polypropylene.

[0047] This invention can be summarized in other specific forms that do not depart from the spirit or essential features of the invention. Therefore, in all respects, the above embodiments of the invention should be considered illustrative only and not limiting, while the claims define the scope of the invention. The foregoing description does not define the scope of the invention; therefore, any changes within the meaning and scope equivalent to the claims should be considered to be included within the scope of the claims.

Claims

1. A high-gloss, low-warpage polypropylene composition, characterized in that, The raw material composition of the composition, by weight, includes: 100 parts of homopolymer polypropylene Deep eutectic solvent: 0.5-3.0 parts Antioxidant 0.03-0.1 parts Acid absorbent 0.03-0.06 parts α-nucleating agent 0.02-0.06 parts 0.02-0.06 parts of β-nucleating agent Inorganic filler 0-0.60 parts.

2. The high-gloss, low-warpage polypropylene composition as described in claim 1, characterized in that, The technical specifications of the homopolymer polypropylene are as follows: Melt mass flow rate (2.16 kg, 190℃): 3-30 g / 10 min Isotacticity 96-99.5%.

3. The high-gloss, low-warpage polypropylene composition as described in claim 1, characterized in that, The deep eutectic solvent DES includes one of choline chloride-glycerol, choline chloride-ethylene glycol, choline chloride-urea, and choline chloride-acetic acid binary DES.

4. The high-gloss, low-warpage polypropylene composition as described in claim 1, characterized in that, The deep eutectic solvent DES includes one of choline chloride-ethylene glycol-urea and choline chloride-glycerol-citric acid ternary DES.

5. The high-gloss, low-warpage polypropylene composition as described in claim 3 or 4, characterized in that, The antioxidants are BASF antioxidants Irganox 1010 and Irganox 168.

6. The high-gloss, low-warpage polypropylene composition as described in claim 5, characterized in that, The acid absorbent is one of calcium stearate or hydrotalcite.

7. The high-gloss, low-warpage polypropylene composition as described in claim 6, characterized in that, The α-nucleating agent is one of the following: organic non-aryl carboxylate salts, organic phosphate salts, and disproportionated rosin salts. Preferably, the α-nucleating agent is one of the following commercial products: RY-2007, HPN-715, or HPN-68L.

8. The high-gloss, low-warpage polypropylene composition as described in claim 7, characterized in that, The β-nucleating agent is one of alicyclic dicarboxylate, rare earth, or polycyclic aromatic hydrocarbon compounds. Preferably, the β-nucleating agent is one of the commercially available WBG-2 or NAB-82.

9. The high-gloss, low-warpage polypropylene composition according to claim 9, characterized in that, The inorganic filler is preferably one of barium sulfate or talc.

10. A method for preparing a high-gloss, low-warpage polypropylene composition, characterized in that, The method steps include: The raw material composition of the high-gloss, low-warpage polypropylene composition according to claim 9 is added into a high-speed mixer in proportion. The high-speed mixer is started and mixed for 5 minutes before being discharged, sealed and stored for extrusion granulation. The high-gloss, low-warpage polypropylene composition of this invention was prepared by using a twin-screw extruder under the following extrusion granulation conditions: extrusion temperature 180-210℃, screw speed 200 rpm, and feeding speed 15 kg / h.

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