Environmentally friendly lightweight blow molded container and method of making same

Abstract

This invention relates to an environmentally friendly lightweight blow-molded container, which has a multi-layer co-extrusion structure. The multi-layer co-extrusion structure includes at least one foam layer, an inner surface support layer, and an outer surface support layer. The foam layer is located between the inner and outer surface support layers. The foam layer is made of the following components by weight: 100 parts of waste plastic scrap PP, 1-3 parts of diallyl isocyanurate, 5-10 parts of acrylamide, 0.3-0.5 parts of initiator, 3-10 parts of foaming material, and 0-15 parts of other additives. The foaming material includes a support structure, which is a three-dimensional porous material. This invention achieves lightweighting through foaming while utilizing waste plastics for high-value conversion. The foamed product of this invention has stable pores that are not easily collapsed, and has good thermal insulation properties.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to an environmentally friendly lightweight blow-molded container and its preparation method. Background Technology

[0002] Polypropylene is widely used due to its excellent properties, including light weight, abundant raw material sources, non-toxicity, and odorlessness. However, as a highly crystalline polymer, its melt strength and viscosity decrease sharply at high temperatures, leading to issues such as cell collapse, rupture, and aggregation during foaming, resulting in unsatisfactory foamed products.

[0003] Waste plastics are now a serious source of pollution. Relying solely on incineration and landfill for post-treatment not only pollutes the environment but also consumes a lot of energy, which is inconsistent with the concept of environmental protection and green living. Compared with virgin materials, waste plastics undergo thermal, oxygen, and photodegradation, leading to the breakage of molecular chains and a decline in performance, making them unsuitable for daily use.

[0004] To improve the current situation, waste plastics are grafted and modified, and then co-extruded with foaming compositions and other additives to prepare environmentally friendly lightweight blow-molded container products. Summary of the Invention

[0005] This invention provides an environmentally friendly lightweight blow-molded container and its preparation method. The invention achieves lightweighting through foaming while utilizing waste plastics for high-value transformation; the foamed product of this invention has stable cell structure, is not easily collapsed, and has good thermal insulation properties.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] An environmentally friendly lightweight blow-molded container has a multi-layer co-extrusion structure; the multi-layer co-extrusion structure includes at least one foam layer, an inner surface support layer, and an outer surface support layer; the foam layer is located between the inner surface support layer and the outer surface support layer;

[0008] The foamed layer comprises the following components by weight: 100 parts of waste plastic shreds PP, 1-3 parts of diallyl isocyanurate, 5-10 parts of acrylamide, 0.3-0.5 parts of initiator, 3-10 parts of foaming material, and 0-15 parts of other additives; the foaming material includes a support, which is a three-dimensional porous structure material.

[0009] Furthermore, the foaming material also includes terpenoids and a foaming agent; the mass ratio of the terpenoids, the foaming agent, and the support is (7-11):(3-5):(1-2).

[0010] Furthermore, the three-dimensional porous structure material is one or more of MOF, ZIF, and cage-type polysilsesquioxane in any proportion; the terpene compound is one or more of camphene, pinene, and limonene in any proportion; and the foaming agent is one or more of citric acid, sodium bicarbonate, azobenzoyl, sodium carbonate, and ammonium bicarbonate in any proportion.

[0011] Furthermore, the other additives include one or more of antistatic agents, antioxidants, and UV stabilizers; the initiator is one of DCP, DTBP, and BIPB.

[0012] Furthermore, the antistatic agent is a mixture of conductive carbon black and dodecylamine polyoxyethylene ether in a mass ratio of 1:0.1-0.15, and the amount of the antistatic agent added to the foamed layer material is 1-3 parts by weight.

[0013] The antioxidant is a mixture of 1010 antioxidant and 168 antioxidant in a mass ratio of 6:4-5:5, and the amount of antioxidant added to the foamed layer material is 3-5 parts by weight.

[0014] The UV stabilizer is one of UV-3808, UV-531, and UV-770, and the amount of the UV stabilizer added to the foamed layer material is 3-5 parts by weight.

[0015] Furthermore, the materials of the inner surface support layer and the outer surface support layer each include the following components by weight: 100 parts HDPE, 3-5 parts color masterbatch, and 3-5 parts antioxidant; the antioxidant is a mixture of 1010 antioxidant and 168 antioxidant in a mass ratio of 6:4-5:5.

[0016] The method for preparing the above-mentioned environmentally friendly lightweight blow-molded container includes the following steps:

[0017] (1) After mixing the terpene compound, foaming agent and support material evenly according to the formula, the foamed material is obtained by extrusion granulation.

[0018] (2) Then, according to the ratio, waste plastic crushed material PP, diallyl isocyanurate and acrylamide are melt-reactively grafted under the action of initiator DCP, and then the foaming material and other additives are added to obtain the foamed layer material.

[0019] Simultaneously prepare the materials for the inner surface support layer and the outer surface support layer for melt blending;

[0020] The materials of the inner surface support layer, the foam layer, and the outer surface support layer are co-extruded in sequence and then blow-molded to obtain an environmentally friendly lightweight blow-molded container.

[0021] Furthermore, the extrusion temperature of the foam is 80-130℃; the temperature of the melt reactive grafting is 150-195℃ and the time is 2-8 minutes.

[0022] Beneficial technical effects:

[0023] 1. By using waste plastic shreds PP with diallyl isocyanurate and acrylamide for melt reactive grafting, grafting is performed on the PP molecular chain to improve melt strength, which is beneficial to cell stability, prevents collapse, and forms uniform and stable cells; at the same time, the presence of amide groups, together with a small amount of antistatic agent, can give blow-molded containers excellent long-lasting antistatic effect.

[0024] Encased in the melt of waste plastic fragments, camphene in the foam first forms bubbles, providing some support for the bubbles. Simultaneously, the addition of a support material with a three-dimensional porous structure further enhances the supporting force on the bubbles, improving the foaming effect from within the foam layer, making the bubbles stable and preventing collapse. It also acts as a reinforcing material, increasing the strength of the foamed product and providing external support for the bubble structure. Therefore, in addition to the internal three-dimensional porous structure as support, the foam layer of this invention also provides support for the bubble structure on its inner and outer surfaces.

[0025] 2. The raw materials used in the three-layer co-extrusion are all polyolefins. The inner and outer surface support layers are made of polyethylene, and the middle foaming layer is made of polypropylene. They have good compatibility. At the same time, when the bubbles generated by the middle foaming encounter the melt of the inner and outer surface support layers, the bubble walls or melt are connected with the melt of the inner and outer surface support layers, so that the three-layer co-extrusion material does not delaminate and has stronger adhesion.

[0026] 3. This invention achieves weight reduction and lightweighting without compromising the sealing performance of the packaging container, while also providing heat insulation. Furthermore, the use of waste plastics helps reduce costs and save resources, aligning with the concept of green development. Moreover, the invention is easy to prepare, simple to process, and convenient for commercial promotion, with promising market application prospects. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Unless otherwise specifically stated, the numerical values ​​set forth in these embodiments do not limit the scope of the invention. Techniques and methods known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques and methods should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0029] Experimental methods not specifically described in the following examples are generally determined according to national standards; if no corresponding national standard exists, they are performed according to generally accepted international standards or the standards proposed by relevant enterprises. Unless otherwise stated, all parts are parts by weight, and all percentages are weight percentages.

[0030] Example 1

[0031] An environmentally friendly lightweight blow-molded container has a multi-layer co-extrusion structure; the multi-layer co-extrusion structure consists of a foam layer, an inner surface support layer, and an outer surface support layer; the foam layer is located between the inner surface support layer and the outer surface support layer;

[0032] The foamed layer is composed of the following components by weight: 100 parts of waste plastic shreds PP, 2 parts of diallyl isocyanurate, 5 parts of acrylamide, 0.3 parts of initiator DCP, 7 parts of foaming agent, 1 part of antistatic agent (conductive carbon black and dodecylamine polyoxyethylene ether mixed at a mass ratio of 1:0.15), 5 parts of antioxidant (antioxidant 1010 and antioxidant 168 mixed at an equal mass ratio), and 5 parts of UV-3808 anti-ultraviolet agent;

[0033] The foam is composed of the following materials in parts by weight: 5.5 parts camphene, 2.5 parts citric acid, and 1 part support (a mixture of MOF-801 and ZIF-8 in equal mass ratio);

[0034] The materials of the inner surface support layer and the outer surface support layer are both composed of the following parts by weight: 100 parts HDPE, 3 parts color masterbatch (color added as needed), and 5 parts antioxidant (antioxidant 1010 and antioxidant 168 are mixed in equal mass ratio).

[0035] The method for preparing the above-mentioned environmentally friendly lightweight blow-molded container includes the following steps:

[0036] (1) Camphene, citric acid and support are mixed evenly according to the formula, and then extruded and granulated at 80-130℃ to obtain foamed material;

[0037] (2) Then, according to the ratio, waste plastic crushed material PP, diallyl isocyanurate and acrylamide are melt-reactively grafted at 150-195℃ for 5 minutes under the action of initiator DCP. Then, the foaming material, antistatic agent, antioxidant and anti-ultraviolet agent are added and blended to obtain the foamed layer material.

[0038] Simultaneously prepare the materials for the inner surface support layer and the outer surface support layer for melt blending;

[0039] The materials of the inner surface support layer, the foam layer, and the outer surface support layer are co-extruded in sequence and then blow-molded to obtain an environmentally friendly lightweight blow-molded container.

[0040] Example 2

[0041] An environmentally friendly lightweight blow-molded container has a multi-layer co-extrusion structure; the multi-layer co-extrusion structure consists of a foam layer, an inner surface support layer, and an outer surface support layer; the foam layer is located between the inner surface support layer and the outer surface support layer;

[0042] The foamed layer is composed of the following components by weight: 100 parts of waste plastic shreds PP, 3 parts of diallyl isocyanurate, 8 parts of acrylamide, 0.4 parts of initiator DCP, 7 parts of foaming agent, 3 parts of antistatic agent (conductive carbon black and dodecylamine polyoxyethylene ether are mixed at a mass ratio of 1:0.15), 5 parts of antioxidant (antioxidant 1010 and antioxidant 168 are mixed at an equal mass ratio), and 5 parts of UV-531 anti-ultraviolet agent;

[0043] The foam is composed of the following materials in parts by weight: 5.5 parts camphene, 2.5 parts citric acid, and 1 part support (a mixture of MOF-808 and ZIF-67 in equal mass ratio);

[0044] The materials of the inner surface support layer and the outer surface support layer are both composed of the following parts by weight: 100 parts HDPE, 4 parts color masterbatch (color added as needed), and 3 parts antioxidant (antioxidant 1010 and antioxidant 168 are mixed in a mass ratio of 3:2).

[0045] The preparation method of the above-mentioned environmentally friendly lightweight blow-molded container is the same as that in Example 1.

[0046] Example 3

[0047] An environmentally friendly lightweight blow-molded container has a multi-layer co-extrusion structure; the multi-layer co-extrusion structure consists of a foam layer, an inner surface support layer, and an outer surface support layer; the foam layer is located between the inner surface support layer and the outer surface support layer;

[0048] The foamed layer is composed of the following components by weight: 100 parts of waste plastic shreds PP, 4 parts of diallyl isocyanurate, 10 parts of acrylamide, 0.5 parts of initiator DCP, 7 parts of foaming agent, 2 parts of antistatic agent (conductive carbon black and dodecylamine polyoxyethylene ether mixed at a mass ratio of 1:0.15), 5 parts of antioxidant (antioxidant 1010 and antioxidant 168 mixed at an equal mass ratio), and 5 parts of UV-770 anti-ultraviolet agent;

[0049] The foam is composed of the following materials in parts by weight: 5.5 parts camphene, 2.5 parts citric acid, and 1 part support (a mixture of MOF-5 and octamethylPOSS CAS No. 17865-85-9 in equal mass ratio);

[0050] The materials of the inner surface support layer and the outer surface support layer are both composed of the following parts by weight: 100 parts HDPE, 5 parts color masterbatch (color added as needed), and 3 parts antioxidant (antioxidant 1010 and antioxidant 168 are mixed in a mass ratio of 3:2).

[0051] The preparation method of the above-mentioned environmentally friendly lightweight blow-molded container is the same as that in Example 1.

[0052] Example 4

[0053] An environmentally friendly lightweight blow-molded container has a multi-layer co-extrusion structure; the multi-layer co-extrusion structure consists of a foam layer, an inner surface support layer, and an outer surface support layer; the foam layer is located between the inner surface support layer and the outer surface support layer;

[0054] The foamed layer is composed of the following components by weight: 100 parts of waste plastic shreds PP, 4 parts of diallyl isocyanurate, 10 parts of acrylamide, 0.5 parts of initiator DCP, 3 parts of foaming agent, 2 parts of antistatic agent (conductive carbon black and dodecylamine polyoxyethylene ether mixed at a mass ratio of 1:0.12), 5 parts of antioxidant (antioxidant 1010 and antioxidant 168 mixed at an equal mass ratio), and 5 parts of UV-770 anti-ultraviolet agent;

[0055] The foam is composed of the following materials in parts by weight: 5.5 parts camphene, 2.5 parts citric acid, and 1 part support (a mixture of ZIF-7 and aminopropylheptyl POSS CAS No. 444315-15-5 in equal mass ratio);

[0056] The materials of the inner surface support layer and the outer surface support layer are both composed of the following parts by weight: 100 parts HDPE, 5 parts color masterbatch (color added as needed), and 4 parts antioxidant (antioxidant 1010 and antioxidant 168 are mixed in equal mass ratio).

[0057] The preparation method of the above-mentioned environmentally friendly lightweight blow-molded container is the same as that in Example 1.

[0058] Example 5

[0059] An environmentally friendly lightweight blow-molded container has a multi-layer co-extrusion structure; the multi-layer co-extrusion structure consists of a foam layer, an inner surface support layer, and an outer surface support layer; the foam layer is located between the inner surface support layer and the outer surface support layer;

[0060] The foamed layer is composed of the following components by weight: 100 parts of waste plastic shreds PP, 4 parts of diallyl isocyanurate, 10 parts of acrylamide, 0.5 parts of initiator DCP, 3 parts of foaming agent, 2 parts of antistatic agent (conductive carbon black and dodecylamine polyoxyethylene ether mixed at a mass ratio of 1:0.1), 5 parts of antioxidant (antioxidant 1010 and antioxidant 168 mixed at an equal mass ratio), and 5 parts of UV-3808 anti-ultraviolet agent;

[0061] The foam is composed of the following materials in parts by weight: 5.5 parts camphene, 2.5 parts foaming agent (azobenzoyl and sodium carbonate in equal mass ratio), and 1 part support (a mixture of ZIF-67 and dimethylsilyl cage polysilsesquioxane CAS No. 125756-69-6 in equal mass ratio);

[0062] The materials of the inner surface support layer and the outer surface support layer are both composed of the following parts by weight: 100 parts HDPE, 5 parts color masterbatch (color added as needed), and 4 parts antioxidant (antioxidant 1010 and antioxidant 168 are mixed in equal mass ratio).

[0063] The preparation method of the above-mentioned environmentally friendly lightweight blow-molded container is the same as that in Example 1.

[0064] Example 6

[0065] An environmentally friendly lightweight blow-molded container has a multi-layer co-extrusion structure; the multi-layer co-extrusion structure consists of a foam layer, an inner surface support layer, and an outer surface support layer; the foam layer is located between the inner surface support layer and the outer surface support layer;

[0066] The foamed layer is composed of the following components by weight: 100 parts of waste plastic shreds PP, 4 parts of diallyl isocyanurate, 10 parts of acrylamide, 0.5 parts of initiator DCP, 7 parts of foaming agent, 2 parts of antistatic agent (conductive carbon black and dodecylamine polyoxyethylene ether mixed at a mass ratio of 1:0.12), 5 parts of antioxidant (antioxidant 1010 and antioxidant 168 mixed at an equal mass ratio), and 5 parts of UV-3808 anti-ultraviolet agent;

[0067] The foam is composed of the following materials in parts by weight: 3.5 parts camphene, 1.5 parts foaming agent (citric acid and ammonium bicarbonate in equal mass ratio), and 0.5 parts support (a mixture of MOF-808 and ZIF-7 in equal mass ratio);

[0068] The materials of the inner surface support layer and the outer surface support layer are both composed of the following parts by weight: 100 parts HDPE, 3 parts color masterbatch (color added as needed), and 4 parts antioxidant (antioxidant 1010 and antioxidant 168 are mixed in equal mass ratio).

[0069] The preparation method of the above-mentioned environmentally friendly lightweight blow-molded container is the same as that in Example 1.

[0070] Example 7

[0071] An environmentally friendly lightweight blow-molded container has a multi-layer co-extrusion structure; the multi-layer co-extrusion structure consists of a foam layer, an inner surface support layer, and an outer surface support layer; the foam layer is located between the inner surface support layer and the outer surface support layer;

[0072] The foamed layer is composed of the following components by weight: 100 parts of waste plastic shreds PP, 4 parts of diallyl isocyanurate, 10 parts of acrylamide, 0.5 parts of initiator DCP, 7 parts of foaming agent, 2 parts of antistatic agent (conductive carbon black and dodecylamine polyoxyethylene ether mixed at a mass ratio of 1:0.15), 5 parts of antioxidant (antioxidant 1010 and antioxidant 168 mixed at an equal mass ratio), and 3 parts of UV-770 anti-ultraviolet agent;

[0073] The foam is composed of the following materials in parts by weight: 4.5 parts camphene, 2 parts foaming agent (citric acid and ammonium bicarbonate in equal mass ratio), and 0.5 parts support (a mixture of ZIF-9 and aminopropylheptyl POSS CAS No. 444315-15-5 in equal mass ratio).

[0074] The materials of the inner surface support layer and the outer surface support layer are both composed of the following parts by weight: 100 parts HDPE, 3 parts color masterbatch (color added as needed), and 5 parts antioxidant (antioxidant 1010 and antioxidant 168 are mixed in equal mass ratio).

[0075] The preparation method of the above-mentioned environmentally friendly lightweight blow-molded container is the same as that in Example 1.

[0076] Comparative Example 1

[0077] The formulation and preparation method of the blow-molded container in this comparative example are the same as those in Example 3, except that the foaming layer material does not contain diallyl isocyanurate, acrylamide, and initiator DCP, and the antistatic agent is increased to 3 parts. That is, this comparative example does not perform melt reactive grafting of amide polar groups onto the waste shredded PP material.

[0078] Comparative Example 2

[0079] The formulation and preparation method of the comparative blow-molded container are the same as those in Example 3, except that the foaming layer material does not contain an antistatic agent.

[0080] Comparative Example 3

[0081] The formulation and preparation method of the comparative blow-molded container are the same as those in Example 3, except that the foaming layer material does not contain diallyl isocyanurate, acrylamide, and initiator DCP, nor does it contain an antistatic agent.

[0082] The tensile properties, flexural properties, melt flow index, apparent density, surface resistivity, and sealing performance of the blow-molded containers of the above embodiments and comparative examples were tested, and the test results are shown in Table 1.

[0083] Tensile properties were tested in accordance with GB / T 1040.1-2018.

[0084] Bending performance was tested in accordance with GB / T 9341-2008.

[0085] Melt flow index was tested according to GB / T 3682.1-2018.

[0086] Apparent density was tested according to GB / T 6343-2009.

[0087] Surface resistivity was tested according to GB / T1410-2006.

[0088] The sealing performance of blow-molded containers shall be tested in accordance with GB / T 13508-2011.

[0089] The test results are shown in Table 1 below.

[0090] Table 1. Test results of the examples and comparative examples.

[0091]

[0092] As shown in Table 1, in Examples 1, 2, and 3, the melt strength and mechanical properties improved with the increase of crosslinking degree, and the density of the three was not much different. With the addition of a small amount of antistatic agent, the product had a good antistatic effect. In Examples 3, 4, and 5, the melt strength remained basically unchanged with the increase of foaming agent dosage, but the density gradually decreased, and the product was lighter.

[0093] Comparative Example 3 is a pure foaming formulation without modification of the waste plastic, with a surface resistivity of 9.42 × 10⁻⁶. 14 Ω, greater than 1×10 12Ω represents an insulating state and exhibits very poor melt strength (high melt index). Comparative Example 1 did not graft amide polar groups onto PP, but it contained an antistatic agent. The antistatic effect was provided by the antistatic agent. Although the amount of antistatic agent was increased, its antistatic effect was slightly worse than that of Example 3. In addition, the high melt index of Comparative Example 1 indicates a significant reduction in melt strength, poor mechanical properties, uneven product thickness, and difficulty in production control. Furthermore, the antistatic effect of Comparative Example 1 is not long-lasting. Comparative Example 2 did not add an antistatic agent, but grafted amide polar groups onto the PP molecular structure. It can be seen that the melt strength of PP was improved after grafting, and its melt index was close to that of Example 3, while providing basic antistatic properties.

[0094] This invention utilizes graft modification of waste PP plastic to prepare a three-layer blow-molded container that achieves lightweight design without compromising its sealing performance as a packaging container. Simultaneously, the presence of amide groups, combined with a small amount of antistatic agent, provides the blow-molded container with excellent long-lasting antistatic properties. Furthermore, the use of three-dimensional porous materials in the foam layer provides internal pore support, and the co-extruded layers on both sides of the foam layer also offer good support for the pores, resulting in stable and less prone-to-collapse foam cells. This superior cell stability contributes to the product's excellent thermal insulation properties.

[0095] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An environmentally friendly, lightweight blow-molded container, characterized in that, The container has a multi-layer co-extrusion structure; the multi-layer co-extrusion structure includes at least one foam layer, an inner surface support layer, and an outer surface support layer; the foam layer is located between the inner surface support layer and the outer surface support layer; The foamed layer comprises the following components by weight: 100 parts of waste plastic shreds PP, 1-3 parts of diallyl isocyanurate, 5-10 parts of acrylamide, 0.3-0.5 parts of initiator, 3-10 parts of foaming agent, and 0-15 parts of other additives; The foaming material includes a support, a terpene compound, and a foaming agent; the mass ratio of the terpene compound, the foaming agent, and the support is (7-11):(3-5):(1-2); The support is a three-dimensional porous structure material; the three-dimensional porous structure material is one or more of MOF and cage-type polysilsesquioxane in any ratio combination; The preparation method includes the following steps: (1) After mixing the terpene compound, foaming agent and support material evenly according to the formula, the foamed material is obtained by extrusion granulation. (2) Then, according to the proportion, waste plastic crushed material PP, diallyl isocyanurate and acrylamide are melt-reactively grafted under the action of an initiator, and then the foaming material and other additives are added to obtain the foamed layer material. Simultaneously prepare the materials for the inner surface support layer and the outer surface support layer for melt blending; The materials of the inner surface support layer, the foam layer, and the outer surface support layer are co-extruded in sequence and then blow-molded to obtain an environmentally friendly lightweight blow-molded container. The extrusion temperature of the foam is 80-130℃; the temperature of the melt reactive grafting is 150-195℃ and the time is 2-8 min.

2. The environmentally friendly lightweight blow-molded container according to claim 1, characterized in that, The terpene compound is one or more of camphene, pinene, and limonene in any ratio; the foaming agent is one or more of citric acid, sodium bicarbonate, azobenzoyl, sodium carbonate, and ammonium bicarbonate in any ratio.

3. The environmentally friendly lightweight blow-molded container according to claim 1, characterized in that, The other additives include one or more of antistatic agents, antioxidants, and UV stabilizers; the initiator is one of DCP, DTBP, and BIPB.

4. The environmentally friendly lightweight blow-molded container according to claim 3, characterized in that, The antistatic agent is a mixture of conductive carbon black and dodecylamine polyoxyethylene ether in a mass ratio of 1:0.1-0.15, and the amount of the antistatic agent added to the foamed layer material is 1-3 parts by weight. The antioxidant is a mixture of 1010 antioxidant and 168 antioxidant in a mass ratio of 6:4-5:5, and the amount of antioxidant added to the foamed layer material is 3-5 parts by weight. The UV stabilizer is one of UV-3808, UV-531, and UV-770, and the amount of the UV stabilizer added to the foamed layer material is 3-5 parts by weight.

5. The environmentally friendly lightweight blow-molded container according to claim 1, characterized in that, The materials of both the inner and outer surface support layers comprise the following components by weight: 100 parts HDPE, 3-5 parts color masterbatch, and 3-5 parts antioxidant; wherein the antioxidant is a mixture of 1010 antioxidant and 168 antioxidant in a mass ratio of 6:4-5:5.

Images