High-strength plastic particles and preparation method thereof

Abstract

The invention relates to the technical field of high polymer materials, and provides high-strength plastic particles and a preparation method thereof. The high-strength plastic particles comprise the following raw material components: PLA, PBAT, a compound modified inorganic filler containing amino, phenyl and ester groups, a polylactic acid-epoxidized soybean oil star copolymer and a processing aid. According to the technical scheme, the problems that the compatibility of PLA and PBAT is poor, so that the tensile property and impact property of the blended material as a plastic material are poor in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to high-strength plastic particles and a preparation method thereof. Background Art

[0002] Plastics, with their advantages of lightweight, insulation, corrosion resistance, and ease of processing, are widely used in various fields, such as plastic bottles, cups, tables, chairs, and tableware. While plastics offer great convenience, their non-degradability poses serious environmental risks. Therefore, biodegradable plastics are widely used to protect the environment.

[0003] Traditional biodegradable plastic materials include polycaprolactone (PCL), polyhexenylsuccinate (PBS) and its polymers, polylactic acid (PLA), poly(butylene adipate-terephthalate) copolyester (PBAT), polytrihydroxybutyric acid (PHB) and its polymers. Among these, blends of PLA and PBAT are the most commonly used plastic materials. PLA's poor toughness, lack of flexibility, and elasticity result in poor impact and tear resistance, limiting its use. PBAT, on the other hand, has excellent tensile properties and flexibility, and blending the two materials can achieve complementary performance. However, PLA and PBAT have poor compatibility, resulting in poor tensile and impact properties of the blended plastic. Summary of the Invention

[0004] The present invention provides a high-strength plastic particle and a preparation method thereof, which solves the problem in the related art that PLA and PBAT have poor compatibility, resulting in poor tensile and impact properties of the blend as a plastic material.

[0005] The technical solutions of the present invention are as follows: Disclosed are high-strength plastic particles, the raw materials of which include the following components: PLA, PBAT, inorganic filler modified by a compound containing amino, phenyl and ester groups, polylactic acid-epoxidized soybean oil star copolymer and processing aids.

[0006] In the present invention, the ratio of PLA and PBAT can be selected according to the performance requirements of the plastic particles. For example, the mass ratio of PLA and PBAT can be 1:99 to 99:1, for example, it can be 1:99, 10:90, 20:80, 30:70, 40:60, 50:50, 60:40, 70:30, 80:20, 90:10 or 99:1, but it is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0007] In the present invention, the amount of the inorganic filler modified with a compound containing an amino group, a phenyl group, and an ester group can be a conventional amount in the art and can be determined according to the performance requirements of the plastic particles. Preferably, the mass ratio of PLA and PBAT to the inorganic filler modified with a compound containing an amino group, a phenyl group, and an ester group is 100:10 to 15, for example, 100:10, 100:11, 100:12, 100:13, 100:14, or 100:15, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0008] As a further technical solution, the mass ratio of the PLA and PBAT to the polylactic acid-epoxidized soybean oil star copolymer is 100:1~3, for example, it can be 100:1, 100:1.5, 100:2, 100:2.5 or 100:3, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0009] As a further technical solution, the raw materials for modifying the inorganic filler with the compound containing amino groups, phenyl groups and ester groups include the compound containing amino groups, phenyl groups and ester groups and the inorganic filler in a mass ratio of 1 to 8:100.

[0010] In the present invention, the compound containing an amino group, a phenyl group and an ester group can be any compound containing an amino group, a phenyl group and an ester group, for example, it can be one or more of tert-butyl (4-aminophenyl)carbamate, methyl phenylcarbamate, methyl 3-aminobenzoate, methyl 4-aminobenzoate, and butyl 4-aminobenzoate, preferably methyl 4-aminobenzoate and butyl 4-aminobenzoate.

[0011] As a further technical solution, the inorganic filler includes one or more of silicon dioxide, talc, iron oxide, aluminum oxide, zinc oxide, and titanium dioxide, preferably talc or silicon dioxide, and more preferably silicon dioxide.

[0012] As a further technical solution, the preparation method of the inorganic filler modified by the compound containing amino, phenyl and ester groups comprises the following steps: S1, ultrasonically dispersing the inorganic filler in a solvent to obtain an inorganic filler dispersion; S2. Adding a compound containing an amino group, a phenyl group, and an ester group into the inorganic filler dispersion, stirring and mixing the mixture evenly, and drying the mixture to obtain an inorganic filler modified with the compound containing an amino group, a phenyl group, and an ester group.

[0013] As a further technical solution, in step S1, the power of the ultrasound is 200~300W, for example, it can be 200W, 210W, 220W, 230W, 240W, 250W, 260W, 270W, 280W, 290W or 300W, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0014] As a further technical solution, in step S1, the frequency of the ultrasound is 20~30kHz, for example, it can be 20kHz, 22kHz, 25kHz, 27kHz, 28kHz or 30kHz, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0015] As a further technical solution, in step S1, the ultrasonic time is 0.5~1h, for example, it can be 0.5h, 0.6h, 0.7h, 0.8h, 0.9h or 1h, but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable.

[0016] In step S1, the solvent may be any solvent that can dissolve the compound containing an amino group, a phenyl group, and an ester group, for example, methanol, ethanol, or diethyl ether, preferably methanol or ethanol.

[0017] As a further technical solution, the mass ratio of the solvent to the inorganic filler is 1.2~1.5:1, for example, it can be 1.2:1, 1.3:1, 1.4:1 or 1.5:1, but is not limited to the listed values. Other unlisted values ​​within this numerical range are also applicable.

[0018] In the present invention, the processing aid may be any one or more functional processing aids known in the art, and the amount used may be any conventional amount in the art. For example, the processing aid may be one or more antistatic agents, antioxidants, and light stabilizers. Antistatic agents can increase the conductivity of the plastic surface, rapidly discharging static electricity generated during friction and preventing its accumulation; antioxidants can capture active free radicals, interrupting chain reactions and delaying oxidation of the plastic; and light stabilizers can prevent degradation, discoloration, and mechanical property degradation of plastic particles due to light exposure.

[0019] As a further technical solution, when the processing aid includes an antistatic agent, the antistatic agent includes one or more of antistatic agent SN, antistatic agent HK, antistatic agent HZ-1, and antistatic agent Mersolat H95.

[0020] As a further technical solution, when the processing aid includes an antioxidant, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant CA.

[0021] As a further technical solution, when the processing aid includes a light stabilizer, the light stabilizer includes one or more of light stabilizer JT-540, light stabilizer 944, light stabilizer 770, and light stabilizer 622.

[0022] The present invention also provides a method for preparing high-strength plastic particles, which is used to prepare the high-strength plastic particles, comprising the following steps: mixing the raw materials evenly, extruding and granulating, and obtaining high-strength plastic particles.

[0023] The working principle and beneficial effects of the present invention are: In the present invention, the addition of a polylactic acid-epoxidized soybean oil star copolymer and an inorganic filler modified with a compound containing amino, phenyl, and ester groups not only improves the compatibility between PLA and PBAT, but also enhances the compatibility of the inorganic filler with the polymer matrix. The polylactic acid segments in the polylactic acid-epoxidized soybean oil star copolymer have good compatibility with PLA. Modification of the inorganic filler with the compound containing amino, phenyl, and ester groups results in surface amino, phenyl, and ester groups. The amino groups react with the residual epoxy groups in the polylactic acid-epoxidized soybean oil star copolymer, while the phenyl-ester segments exhibit good compatibility with PBAT, ultimately improving the tensile and impact properties of the plastic particles. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] The parameters of each raw material in the following examples and comparative examples are as follows: PLA is PLA Fengyuan FY801; PBAT is PBAT Lanshan Tunhe TH801T; Polylactic acid-epoxidized soybean oil star copolymer: purchased from Xi'an Qiyue Biotechnology Co., Ltd., product number 0005; Four-needle zinc oxide whiskers: diameter 0.5~5μm, length 10~50μm; Talc: 1250 mesh; Silicon dioxide: 1250 mesh.

[0026] Example 1 S1. 100 parts of tetrapod-shaped zinc oxide whiskers were ultrasonically dispersed in 150 parts of ethanol at a power of 300 W and a frequency of 20 kHz for 1 hour, 8 parts of methyl 4-aminobenzoate were added, and the mixture was stirred at 500 rpm for 0.5 hour, and dried to obtain a modified inorganic filler; S2. Evenly mix 60 parts of PLA, 40 parts of PBAT, 2 parts of polylactic acid-epoxidized soybean oil star copolymer, 10 parts of modified inorganic filler, and 1.5 parts of antioxidant 1010, and extrude and granulate to obtain high-strength plastic particles.

[0027] Example 2 S1. Disperse 100 parts of tetrapod-shaped zinc oxide whiskers in 120 parts of ethanol by ultrasonication at a power of 200 W and a frequency of 30 kHz for 0.5 h, add 1 part of butyl 4-aminobenzoate, stir at 300 rpm for 1 h, and dry to obtain a modified inorganic filler; S2. 60 parts of PLA, 40 parts of PBAT, 3 parts of polylactic acid-epoxidized soybean oil star copolymer, 15 parts of modified inorganic filler, and 1 part of antistatic agent SN were mixed evenly, and extruded into granules to obtain high-strength plastic granules.

[0028] Example 3 S1. 100 parts of tetrapod-shaped zinc oxide whiskers were ultrasonically dispersed in 150 parts of ethanol at a power of 300 W and a frequency of 30 kHz for 0.5 h, 5 parts of methyl 4-aminobenzoate were added, and the mixture was stirred at 400 rpm for 0.5 h, and dried to obtain a modified inorganic filler; S2. 60 parts of PLA, 40 parts of PBAT, 1 part of polylactic acid-epoxidized soybean oil star copolymer, 10 parts of modified inorganic filler, and 1.5 parts of light stabilizer JT-540 were mixed evenly, and extruded into granules to obtain high-strength plastic granules.

[0029] Example 4 The only difference from Example 1 is that the tetrapod-shaped zinc oxide whiskers are replaced with an equal amount of talc powder.

[0030] Example 5 The only difference from Example 1 is that the tetrapod-shaped zinc oxide whiskers are replaced by an equal amount of silicon dioxide.

[0031] Comparative Example 1 60 parts of PLA, 40 parts of PBAT, 2 parts of polylactic acid-epoxidized soybean oil star copolymer, 10 parts of tetrapod-shaped zinc oxide whiskers, and 1.5 parts of antioxidant 1010 were mixed evenly, extruded and granulated to obtain high-strength plastic particles.

[0032] Comparative Example 2 S1. 100 parts of tetrapod-shaped zinc oxide whiskers were ultrasonically dispersed in 150 parts of ethanol at a power of 300 W and a frequency of 20 kHz for 1 hour, 8 parts of methyl 4-aminobenzoate were added, and the mixture was stirred at 500 rpm for 0.5 hour, and dried to obtain a modified inorganic filler; S2. Evenly mix 60 parts of PLA, 40 parts of PBAT, 10 parts of modified inorganic filler, and 1.5 parts of antioxidant 1010, and extrude and granulate to obtain high-strength plastic particles.

[0033] Comparative Example 3 60 parts of PLA, 40 parts of PBAT, 2 parts of polylactic acid-epoxidized soybean oil star copolymer, 10 parts of tetrapod-shaped zinc oxide whiskers, 0.8 parts of methyl 4-aminobenzoate, and 1.5 parts of antioxidant 1010 were mixed evenly, extruded and granulated to obtain high-strength plastic particles.

[0034] The plastic particles of Examples 1 to 5 and Comparative Examples 1 to 3 were processed into test samples and subjected to the following performance tests: (1) Tensile properties: The tensile strength test was carried out according to the method in GB / T 1040.2-2022. The specimen type was 1A specimen and the test speed was 50 mm / min. (2) Impact performance: The notched specimen cantilever beam impact strength test was carried out according to the method in GB / T 1843-2008, and the notch type was type A; The test results are recorded in Table 1.

[0035] Table 1 Test results of tensile and impact properties of plastic particles

[0036] As can be seen from Table 1, the tensile strength and notched cantilever beam impact strength of the plastic particles obtained in Examples 1 to 5 are higher than those in Comparative Examples 1 to 3, indicating that the present invention provides high-strength plastic particles, which improve the tensile properties and impact properties of the plastic particles by adding a polylactic acid-epoxidized soybean oil star copolymer and an inorganic filler modified by a compound containing amino, phenyl and ester groups.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-strength plastic particle, characterized in that: The raw materials include the following components: PLA, PBAT, inorganic filler modified by a compound containing amino, phenyl and ester groups, polylactic acid-epoxidized soybean oil star copolymer and processing aid.

2. A high-strength plastic particle according to claim 1, characterized in that: The raw materials of the inorganic filler modified with the compound containing amino groups, phenyl groups and ester groups include the compound containing amino groups, phenyl groups and ester groups and the inorganic filler in a mass ratio of 1 to 8:

100.

3. The high-strength plastic particles according to claim 2, characterized in that: The inorganic filler includes one or more of silicon dioxide, talc, iron oxide, aluminum oxide, zinc oxide, and titanium dioxide.

4. The high-strength plastic particles according to claim 2, characterized in that: The compound containing amino, phenyl and ester groups includes one or more of methyl phenylcarbamate, methyl 3-aminobenzoate, methyl 4-aminobenzoate and butyl 4-aminobenzoate.

5. The high-strength plastic particles according to any one of claims 1 to 4, characterized in that: The preparation method of the inorganic filler modified by the compound containing amino groups, phenyl groups and ester groups comprises the following steps: S1, ultrasonically dispersing the inorganic filler in a solvent to obtain an inorganic filler dispersion; S2. Adding a compound containing an amino group, a phenyl group, and an ester group into the inorganic filler dispersion, stirring and mixing the mixture evenly, and drying the mixture to obtain an inorganic filler modified with the compound containing an amino group, a phenyl group, and an ester group.

6. The high-strength plastic particles according to claim 1, characterized in that: The processing aids include one or more of an antistatic agent, an antioxidant, and a light stabilizer.

7. The high-strength plastic granules according to claim 6, characterized in that: When the processing aid includes an antistatic agent, the antistatic agent includes one or more of antistatic agent SN, antistatic agent HK, antistatic agent HZ-1, and antistatic agent Mersolat H95.

8. The high-strength plastic particles according to claim 6, characterized in that: When the processing aid includes an antioxidant, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant CA.

9. The high-strength plastic particles according to claim 6, characterized in that: When the processing aid includes a light stabilizer, the light stabilizer includes one or more of light stabilizer JT-540, light stabilizer 944, light stabilizer 770, and light stabilizer 622.

10. A method for preparing high-strength plastic particles, for preparing the high-strength plastic particles according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing the raw materials uniformly, extruding and granulating, and obtaining high-strength plastic particles.

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