A blow molding grade biodegradable material for cosmetic containers and a preparation method thereof

Abstract

The present invention provides a blow molding grade biodegradable material and a preparation method thereof for a cosmetic container, wherein the material includes 20 to 30 parts of polybutylene terephthalate-adipate (PBAT), 60 to 80 parts of carbon nanotube-modified polylactic acid (PLA), 10 to 20 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), 5 to 10 parts of polyolefin elastomer (POE), 10 to 15 parts of titanium dioxide, 1 to 4 parts of glycerol, 0.1 to 0.5 parts of B900 antioxidant, and 0.1 to 0.5 parts of oleamide lubricant. The degradable material has a good degradation rate, and the container obtained by blow molding also has excellent mechanical properties such as tensile strength, impact strength and high toughness, and has good appearance transparency and good texture. It can be effectively used for the storage of cosmetics, can give consumers a good visual impact, and thus enhance consumers' willingness to buy.

Description

Technical Field

[0001] The invention relates to the field of cosmetic containers, and in particular to a blow molding-grade biodegradable material used in cosmetic containers and a preparation method thereof. Background Art

[0002] Blow-molded containers are formed by extrusion or injection equipment through polymer materials and additives, and then blow-molded into containers through corresponding molds. In addition to the advantages shared by most polymer containers, blow-molded containers can also be made into containers of different shapes and volumes, have good shape stability, can be sealed in various forms and methods, and are widely used in life and industry. Specifically, they can be used to package meat, milk and fish processing products, contain fuel, lubricating materials and chemical raw materials, and package cosmetics and medicines. Due to its wide application, a large amount of use will inevitably lead to huge pressure on the environment due to waste. With the increasingly stringent requirements and standards, fully biodegradable blow-molded containers have been developed. PBAT is a thermoplastic biodegradable plastic, a copolymer of butylene adipate and butylene terephthalate, with the characteristics of both PBA and PBT, with good ductility and elongation at break, as well as good heat resistance and impact resistance; in addition, it also has excellent biodegradability, and is one of the most popular and best degradable materials in the research of biodegradable plastics. Polylactic acid (PLA) is a new type of biodegradable material, made from starch raw materials from renewable plant resources (such as corn). Starch raw materials are saccharified to obtain glucose, which is then fermented with glucose and certain strains of bacteria to produce high-purity lactic acid, which is then synthesized into polylactic acid of a certain molecular weight through chemical synthesis.

[0003] Chinese patent CN108250696A discloses a cellulose fully biodegradable blow molding material, and the raw materials for preparation include: polybutylene terephthalate adipate, polylactic acid, polyvinyl alcohol, straw powder, compatibilizer, additive and nano-rigid organic material; wherein the compatibilizer is at least one of polyethylene glycol, silane coupling agent, aluminum titanate and titanate; the additive is one or more of plasticizer, crosslinker and internal lubricant; the nano-rigid organic material is cellulose nanocrystal or cellulose nanofibril. Chinese patent CN113736233A discloses a PBAT / PLA starch-based fully biodegradable material composition, particles, composite film and preparation method thereof, and the material composition includes: 30-60 parts by weight of PBAT, 3-10 parts by weight of PLA, 10-40 parts by weight of starch, 10-20 parts by weight of plasticizer, 0.2-0.8 parts by weight of lubricant, 0.1-0.5 parts by weight of compatibilizer and 0.1-0.5 parts by weight of chain extender. Although fully biodegradable blow molding materials are currently prepared by blending PBAT and PLA, there is still room for further improvement in terms of degradation performance and mechanical properties.

[0004] The requirements for blow-molded cosmetic containers for different application scenarios not only require excellent mechanical properties, but also have high requirements for the appearance and visual appearance of the packaging; the preparation of cosmetic containers with noble, exquisite and transparent appearance also has broad prospects. Summary of the invention

[0005] Based on the needs of existing products, the purpose of the present invention is to provide a blow-molded biodegradable material for cosmetic containers and a preparation method thereof, the biodegradable material has a good degradation rate, and the blow-molded container also has excellent tensile strength, impact strength, high toughness and other mechanical properties, and has good appearance transparency and texture. It can be effectively used to hold cosmetics, can give consumers a good visual impact, and thus enhance consumers' willingness to buy.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a blow molding grade biodegradable material for cosmetic containers, comprising the following raw materials in parts by weight:

[0007] 20-30 parts of polybutylene terephthalate adipate (PBAT),

[0008] 60-80 parts of carbon nanotube modified polylactic acid (PLA),

[0009] 10-20 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG),

[0010] Polyolefin elastomer (POE) 5-10 parts,

[0011] 10-15 parts of titanium dioxide,

[0012] 1-4 parts of glycerin,

[0013] B900 antioxidant 0.1-0.5 parts,

[0014] Oleic acid amide lubricant 0.1-0.5 parts.

[0015] Furthermore, the blow molding grade biodegradable material comprises the following raw materials in parts by weight:

[0016] 23-27 parts of polybutylene terephthalate adipate (PBAT),

[0017] 65-75 parts of carbon nanotube modified polylactic acid (PLA),

[0018] 12-18 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG),

[0019] Polyolefin elastomer (POE) 7-8 parts,

[0020] 12-13 parts of titanium dioxide,

[0021] 2-3 parts of glycerin,

[0022] B900 antioxidant 0.3-0.4 parts,

[0023] Oleic acid amide lubricant 0.2-0.4 parts.

[0024] Furthermore, the preparation steps of the carbon nanotube-modified polylactic acid (PLA) are as follows: (1) pre-drying PLA particles in a vacuum oven at a temperature of 75 to 85° C. for 3 to 4 hours; (2) dissolving 20 to 25 parts of PLA in 5 to 10 L of tetrahydrofuran, heating to 50 to 60° C. and stirring for 1 to 2 hours; (3) dispersing 2 to 3 parts of carbon nanotubes in 1 to 3 L of tetrahydrofuran, and ultrasonically treating for 1 to 2 hours; (4) after ultrasonic treatment, adding the carbon nanotube-tetrahydrofuran dispersion obtained in step (3) to the polylactic acid solution of step (2); and then continuously stirring at 40 to 50° C. for 2 to 3 hours; (5) evaporating tetrahydrofuran from the mixture obtained in step (4), and then drying the solid at room temperature to obtain the carbon nanotube-modified polylactic acid. (6) The dried solid is fed into a torque rheometer to obtain well-dispersed carbon nanotube-modified polylactic acid, wherein the temperature is set at 190-200° C. and the rotation speed is set at 30-40 r / min.

[0025] Furthermore, the blow molding grade biodegradable material also includes a polyethylene glycol plasticizer; the weight portion of the stabilizer is 0.05 to 0.1 parts.

[0026] Furthermore, the blow molding-grade biodegradable material also contains a polyurethane chain extender; the weight portion of the chain extender is 0.1 to 0.3 parts.

[0027] The present invention also provides a method for preparing the above-mentioned blow molding grade biodegradable material, which specifically comprises the following steps:

[0028] (1) Polybutylene terephthalate-adipate (PBAT), carbon nanotube-modified polylactic acid (PLA), polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), polyolefin elastomer (POE), glycerol, B900 antioxidant, and oleic acid amide lubricant are uniformly mixed according to a weight ratio;

[0029] (2) The mixture obtained in step (1) is fed through the main feed, and titanium dioxide is fed through the side feed, and the mixture is melted, mixed, extruded, and granulated through a twin-screw extruder to obtain a blow molding grade biodegradable material.

[0030] Furthermore, the aspect ratio of the twin-screw extruder is (50-55): 1. The screw speed control is set to 400-500r / min.

[0031] Furthermore, the set temperature of the twin-screw extruder is: section one: 125-155°C, section two: 125-155°C, section three: 140-170°C, section four: 135-165°C, section five: 140-170°C, section six: 140-170°C, section seven: 135-175°C, section eight: 150-180°C, section nine: 150-180°C, and die head: 155-185°C.

[0032] The present invention also provides a cosmetic container, wherein the cosmetic container is prepared by blow molding the above-mentioned blow molding-grade biodegradable material.

[0033] PBAT belongs to thermoplastic biodegradable plastics, which is a copolymer of butylene adipate and butylene terephthalate. It has the characteristics of PBA and PBT, and has good ductility and elongation at break, as well as good heat resistance and impact resistance. In addition, it has excellent biodegradability and is one of the most popular and market-application-friendly biodegradable materials in biodegradable plastic research. Polylactic acid (PLA) is a new type of biodegradable material, which is made from starch raw materials proposed by renewable plant resources (such as corn). Starch raw materials are saccharified to obtain glucose, which is then fermented by glucose and certain strains to produce high-purity lactic acid, and then polylactic acid of a certain molecular weight is synthesized by chemical synthesis. By blending PBAT with PLA, the rigidity of blow molding-grade biodegradable materials is improved, so that the blend can be used to form a cosmetic container, thanks to its good balance of strength, rigidity, flexibility and toughness. The present invention further uses carbon nanotubes to modify PLA, which can further improve the mechanical properties of the container, such as excellent tensile strength, impact strength and high toughness.

[0034] The degradation rate of polylactic acid (PLA) is lower than that of polybutylene terephthalate-adipate (PBAT); and the degradation temperature of polylactic acid (PLA) is higher than that of polybutylene terephthalate-adipate (PBAT); therefore, under the same composting degradation conditions, it is easy to cause the overall degradation time to be inconsistent; especially for PLA modified by carbon nanotubes, although the improvement in mechanical properties is expected, it is unfavorable for its degradation rate to further decrease and degradation temperature to further increase. After a large number of experiments, the applicant chose to add a certain amount of glycerol to the biodegradable material, and found that the addition of glycerol can make PLA biodegrade at lower temperatures. The degradation process is as follows:

[0035]

[0036] PETG resin has been rapidly developed in the application of cosmetic containers and is an ideal container material. It can enhance the decorative treatment of the container surface. After anti-ultraviolet treatment, its transparency is still good, and the appearance of the container is close to that of glass. However, the container formed by the material mainly made of PETG resin is relatively soft in touch. The applicant uses it as a secondary component in the blow molding of the container, and after blending with carbon nanotube modified polylactic acid, it can effectively improve the texture of the container body, which can approach the touch of glass material and enhance the touch feeling of consumers.

[0037] Polyolefin elastomer (POE) is a thermoplastic elastomer with a narrow relative molecular weight distribution and uniform short chain branch distribution; it can be used to improve the toughness and impact resistance of polymer materials.

[0038] Composite antioxidant B900 is a highly efficient composite antioxidant with good light stability and excellent color fastness. It has good compatibility with most polymers and is particularly suitable for high-temperature production and processing of various polymer materials.

[0039] Compared with the prior art, the present invention has the following beneficial effects: (1) With polybutylene terephthalate-adipate (PBAT) and polylactic acid (PLA) 65-75 parts as the main components, on the basis of meeting the basic requirements of degradability and mechanical properties of the material, the polylactic acid is modified with carbon nanotubes, further improving the mechanical properties such as tensile strength, impact strength and high toughness; and the degradation performance is also improved. (2) By compounding the raw material components, the product container is finally achieved with good transparency and texture, which can be effectively used for containing cosmetics, can give consumers a good visual impact, and thus enhance consumers' willingness to buy. DETAILED DESCRIPTION

[0040] Next, the preferred embodiments of the present invention are described in detail so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit description of the protection scope of the present invention.

[0041] Example 1

[0042] Carbon nanotube-modified polylactic acid (PLA) is prepared, and the preparation steps of the carbon nanotube-modified polylactic acid (PLA) are as follows: (1) PLA particles are pre-dried in a vacuum furnace at a temperature of 80°C and a drying time of 4 hours; (2) 20 parts by weight of PLA are dissolved in 6 parts of tetrahydrofuran, heated to 60°C and stirred for 2 hours; (3) 3 parts of carbon nanotubes are dispersed in 2 parts of tetrahydrofuran and ultrasonically treated for 2 hours; (4) after ultrasonic treatment, the carbon nanotube-tetrahydrofuran dispersion obtained in step (3) is added to the polylactic acid solution of step (2); and then stirred at 50°C for 2 hours; (5) tetrahydrofuran is evaporated from the mixture obtained in step (4), and then the solid is dried at room temperature to obtain carbon nanotube-modified polylactic acid. (6) The dried solid is sent to a torque rheometer to obtain well-dispersed carbon nanotube-modified polylactic acid, wherein the temperature is set to 200°C and the speed is set to 40rpm / min.

[0043] Example 2

[0044] A blow molding-grade biodegradable material for cosmetic containers comprises the following raw materials, measured by weight: 20 parts of polybutylene terephthalate-adipate (PBAT), 60 parts of carbon nanotube-modified polylactic acid (PLA), 10 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), 5 parts of polyolefin elastomer (POE), 10 parts of titanium dioxide, 1 part of glycerol, 0.1 part of B900 antioxidant, and 0.1 part of oleic acid amide lubricant.

[0045] The preparation method of the above-mentioned blow molding grade biodegradable material specifically comprises the following steps: (1) uniformly mixing polybutylene terephthalate-adipate (PBAT), carbon nanotube-modified polylactic acid (PLA), polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), polyolefin elastomer (POE), glycerol, B900 antioxidant, and oleic acid amide lubricant according to a weight ratio; (2) adding the mixture obtained in step (1) through the main feed and adding titanium dioxide through the side feed, and melting, mixing, extruding, and granulating through a twin-screw extruder to obtain the blow molding grade biodegradable material. The aspect ratio of the twin-screw extruder is 50:1, and the screw speed control is set to 400r / min; the set temperatures of the twin-screw extruder are: section one: 135°C, section two: 135°C, section three: 150°C, section four: 145°C, section five: 145°C, section six: 150°C, section seven: 155°C, section eight: 160°C, section nine: 160°C, and die head: 165°C.

[0046] The container is obtained by blow molding the above biodegradable material.

[0047] Example 3

[0048] A blow molding-grade biodegradable material for cosmetic containers comprises the following raw materials, measured by weight: 30 parts of polybutylene terephthalate-adipate (PBAT), 80 parts of carbon nanotube-modified polylactic acid (PLA), 20 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), 10 parts of polyolefin elastomer (POE), 15 parts of titanium dioxide, 4 parts of glycerol, 0.5 parts of B900 antioxidant, and 0.5 parts of oleamide lubricant.

[0049] The preparation method of the above-mentioned blow molding grade biodegradable material specifically comprises the following steps: (1) uniformly mixing polybutylene terephthalate-adipate (PBAT), carbon nanotube-modified polylactic acid (PLA), polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), polyolefin elastomer (POE), glycerol, B900 antioxidant, and oleic acid amide lubricant according to a weight ratio; (2) adding the mixture obtained in step (1) through the main feed and adding titanium dioxide through the side feed, and melting, mixing, extruding, and granulating through a twin-screw extruder to obtain the blow molding grade biodegradable material. The aspect ratio of the twin-screw extruder is 55:1, and the screw speed control is set to 400r / min; the set temperatures of the twin-screw extruder are: first section: 145°C, second section: 145°C, third section: 160°C, fourth section: 155°C, fifth section: 155°C, sixth section: 160°C, seventh section: 165°C, eighth section: 170°C, ninth section: 170°C, and die head: 175°C.

[0050] The container is obtained by blow molding the above biodegradable material.

[0051] Example 4

[0052] A blow molding-grade biodegradable material for cosmetic containers comprises the following raw materials, measured by weight: 25 parts of polybutylene terephthalate-adipate (PBAT), 70 parts of carbon nanotube-modified polylactic acid (PLA), 15 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), 7 parts of polyolefin elastomer (POE), 13 parts of titanium dioxide, 2 parts of glycerol, 0.3 parts of B900 antioxidant, and 0.2 parts of oleamide lubricant.

[0053] The preparation method of the above-mentioned blow molding grade biodegradable material specifically comprises the following steps: (1) uniformly mixing polybutylene terephthalate-adipate (PBAT), carbon nanotube-modified polylactic acid (PLA), polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), polyolefin elastomer (POE), glycerol, B900 antioxidant, and oleic acid amide lubricant according to a weight ratio; (2) adding the mixture obtained in step (1) through the main feed and adding titanium dioxide through the side feed, and melting, mixing, extruding, and granulating through a twin-screw extruder to obtain the blow molding grade biodegradable material. The aspect ratio of the twin-screw extruder is 55:1, and the screw speed control is set to 400r / min; the set temperatures of the twin-screw extruder are: first section: 140°C, second section: 140°C, third section: 155°C, fourth section: 150°C, fifth section: 150°C, sixth section: 155°C, seventh section: 160°C, eighth section: 165°C, ninth section: 165°C, and die head: 170°C.

[0054] The container is obtained by blow molding the above biodegradable material.

[0055] Comparative Example 1

[0056] A blow molding-grade biodegradable material for cosmetic containers comprises the following raw materials, measured by weight: 25 parts of polybutylene terephthalate-adipate (PBAT), 70 parts of polylactic acid (PLA), 15 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), 7 parts of polyolefin elastomer (POE), 13 parts of titanium dioxide, 2 parts of glycerol, 0.3 parts of B900 antioxidant, and 0.2 parts of oleamide lubricant.

[0057] The preparation method of the above-mentioned blow molding grade biodegradable material specifically comprises the following steps: (1) uniformly mixing polybutylene terephthalate-adipate (PBAT), polylactic acid (PLA), polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), polyolefin elastomer (POE), glycerol, B900 antioxidant, and oleic acid amide lubricant according to a weight ratio; (2) adding the mixture obtained in step (1) through the main feed and adding titanium dioxide through the side feed, and melting, mixing, extruding, and granulating through a twin-screw extruder to obtain the blow molding grade biodegradable material. The aspect ratio of the twin-screw extruder is 55:1, and the screw speed control is set to 400r / min; the set temperatures of the twin-screw extruder are: first section: 140°C, second section: 140°C, third section: 155°C, fourth section: 150°C, fifth section: 150°C, sixth section: 155°C, seventh section: 160°C, eighth section: 165°C, ninth section: 165°C, and die head: 170°C.

[0058] The container is obtained by blow molding the above biodegradable material.

[0059] Comparative Example 2

[0060] A blow molding-grade biodegradable material for cosmetic containers comprises the following raw materials, measured by weight: 25 parts of polybutylene terephthalate-adipate (PBAT), 70 parts of carbon nanotube-modified polylactic acid (PLA), 7 parts of polyolefin elastomer (POE), 13 parts of titanium dioxide, 2 parts of glycerol, 0.3 parts of B900 antioxidant, and 0.2 parts of oleamide lubricant.

[0061] The preparation method of the above-mentioned blow molding grade biodegradable material specifically comprises the following steps: (1) uniformly mixing polybutylene terephthalate-adipate (PBAT), carbon nanotube-modified polylactic acid (PLA), polyolefin elastomer (POE), glycerol, B900 antioxidant, and oleic acid amide lubricant according to a weight ratio; (2) adding the mixture obtained in step (1) through the main feed and adding titanium dioxide through the side feed, and melting, mixing, extruding, and granulating through a twin-screw extruder to obtain the blow molding grade biodegradable material. The aspect ratio of the twin-screw extruder is 55:1, and the screw speed control is set to 400r / min; the set temperatures of the twin-screw extruder are: first section: 140°C, second section: 140°C, third section: 155°C, fourth section: 150°C, fifth section: 150°C, sixth section: 155°C, seventh section: 160°C, eighth section: 165°C, ninth section: 165°C, and die head: 170°C.

[0062] The container is obtained by blow molding the above biodegradable material.

[0063] Comparative Example 3

[0064] A blow molding-grade biodegradable material for cosmetic containers comprises the following raw materials, measured by weight: 25 parts of polybutylene terephthalate-adipate (PBAT), 70 parts of carbon nanotube-modified polylactic acid (PLA), 15 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), 7 parts of polyolefin elastomer (POE), 13 parts of titanium dioxide, 0.3 parts of B900 antioxidant, and 0.2 parts of oleic acid amide lubricant.

[0065] The preparation method of the above-mentioned blow molding grade biodegradable material specifically comprises the following steps: (1) uniformly mixing polybutylene terephthalate-adipate (PBAT), carbon nanotube-modified polylactic acid (PLA), polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), polyolefin elastomer (POE), B900 antioxidant, and oleic acid amide lubricant according to a weight ratio; (2) adding the mixture obtained in step (1) through the main feed and adding titanium dioxide through the side feed, and melting, mixing, extruding, and granulating through a twin-screw extruder to obtain the blow molding grade biodegradable material. The aspect ratio of the twin-screw extruder is 55:1, and the screw speed control is set to 400r / min; the set temperatures of the twin-screw extruder are: first section: 140°C, second section: 140°C, third section: 155°C, fourth section: 150°C, fifth section: 150°C, sixth section: 155°C, seventh section: 160°C, eighth section: 165°C, ninth section: 165°C, and die head: 170°C.

[0066] The container is obtained by blow molding the above biodegradable material.

[0067] The properties of the blow molding grade biodegradable materials prepared in Examples 1-4 and Comparative Examples 1-3 were tested. The results are recorded in Table 1.

[0068]

[0069] It can be seen from the mechanical property test in Table 1 that the blow molding grade biodegradable material for cosmetic containers provided in the present application has excellent tensile strength, impact strength and high toughness.

[0070] The degradation rates of the films prepared by the above operation were tested by composting method at 60 days and 90 days, and the degradation rates are recorded in Table 2.

[0071]

[0072] According to the data in Table 2, the blow molding biodegradable material for cosmetic containers provided by the present application has excellent degradation performance. According to the data in Comparative Example 3, its degradation rate is much lower than that of the present application, which also shows that glycerol is beneficial to the degradation of PLA and carbon nanotube-modified PLA.

[0073] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, any modifications, equivalent substitutions, improvements, etc. made without departing from the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A blow molding grade biodegradable material for cosmetic containers, characterized in that: According to weight parts, it includes the following raw materials: 20-30 parts of polybutylene terephthalate-adipate, 60-80 parts of carbon nanotube modified polylactic acid, 10 to 20 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol, Polyolefin elastomer 5-10 parts, 10-15 parts of titanium dioxide, 1-4 parts of glycerin, B900 antioxidant 0.1-0.5 parts, Oleic acid amide lubricant 0.1-0.5 parts; The preparation steps of the carbon nanotube modified polylactic acid are as follows: (1) pre-drying PLA particles in a vacuum furnace at a temperature of 75-85° C. and a drying time of 3-4 hours; (2) dissolving 20-25 parts of PLA in 5-10 L of tetrahydrofuran, heating to 50-60° C. and stirring for 1-2 hours; (3) dispersing 2-3 parts of carbon nanotubes in 1-3 L of tetrahydrofuran and subjecting to ultrasonic treatment for 1-2 hours; (4) after ultrasonic treatment, adding the carbon nanotube-tetrahydrofuran dispersion obtained in step (3) to the polylactic acid solution in step (2); and then continuously stirring at 40-50° C. for 2-3 hours; (5) evaporating tetrahydrofuran from the mixture obtained in step (4), and then drying the solid at room temperature to obtain carbon nanotube modified polylactic acid; (6) feeding the dried solid into a torque rheometer to obtain well-dispersed carbon nanotube modified polylactic acid, wherein the temperature is set at 190-200° C. and the rotation speed is set at 30-40 rpm; The method for preparing the blow molding grade biodegradable material specifically comprises the following steps: (1) Polybutylene terephthalate-adipate, carbon nanotube-modified polylactic acid, polyethylene terephthalate-1,4-cyclohexanedimethanol, polyolefin elastomer, glycerol, B900 antioxidant, and oleic acid amide lubricant are uniformly mixed according to a weight ratio; (2) adding the mixture obtained in step (1) through the main feed and adding titanium dioxide through the side feed, melting, mixing, extruding and granulating through a twin-screw extruder to obtain a blow molding grade biodegradable material; The aspect ratio of the twin-screw extruder is (50-55):

1. The screw speed control is set to 400-500 r / min; The set temperatures of the twin-screw extruder are: section one: 125-155°C, section two: 125-155°C, section three: 140-170°C, section four: 135-165°C, section five: 140-170°C, section six: 140-170°C, section seven: 135-175°C, section eight: 150-180°C, section nine: 150-180°C, and die head: 155-185°C.

2. The blow molding grade biodegradable material according to claim 1, characterized in that: According to weight parts, it includes the following raw materials: 23 to 27 parts of polybutylene terephthalate-adipate, 65-75 parts of carbon nanotube modified polylactic acid, 12 to 18 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol, Polyolefin elastomer 7-8 parts, 12-13 parts of titanium dioxide, 2-3 parts of glycerin, B900 antioxidant 0.3-0.4 parts, Oleic acid amide lubricant 0.2-0.4 parts.

3. The blow molding grade biodegradable material according to claim 1 or 2, characterized in that: The blow molding-grade biodegradable material further comprises a polyethylene glycol plasticizer; the weight portion of the plasticizer is 0.05 to 0.1 parts.

4. A cosmetic container, characterized in that: The cosmetic container is prepared by blow molding the blow molding-grade biodegradable material according to any one of claims 1 to 3.

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