Low-cost polyethylene composition and application thereof

Abstract

The invention discloses a low-cost polyethylene composition and application thereof, and belongs to the technical field of polyethylene. The low-cost polyethylene composition is prepared from the following raw materials in parts by weight: 45-65 parts of recycled polyethylene, 40-50 parts of a filling agent, 0.05-0.3 part of an antioxidant and 1-10 parts of an interface compatilizer, wherein the recycled polyethylene is selected from at least two of recycled polyethylene materials, recycled materials of big blue barrels and recycled materials of PE (polyethylene) films; the filler at least comprises a calcium carbonate filler and comprises or does not comprise a talcum powder filler; the composition is also added with a coupling agent or a toughening agent, the use amount of the coupling agent is 0.2-0.6 part, and the use amount of the toughening agent is 1-10 parts. The mechanical property and the cost are comprehensively considered, the high mechanical property of the polyethylene reclaimed material doped pipe is maintained, and meanwhile the cost of the pipe can be reduced by 10% or above.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of polyethylene, in particular to a low-cost polyethylene composition and its application, which uses recycled materials as raw materials, adds special additives to meet the requirements of mechanical properties, and has low cost. BACKGROUND

[0002] As the "main force" of the plastic family, polyethylene (PE) is widely used in packaging, agriculture, construction and other industries due to its excellent chemical stability, corrosion resistance, easy processing and many other advantages. This directly leads to an explosive increase in the number of discarded polyethylene products, and the accumulation of polyethylene garbage in landfills. Landfill disposal occupies a large amount of land resources, and because polyethylene is extremely difficult to naturally degrade, landfill space is becoming increasingly tight; when incinerated, it releases toxic and harmful substances such as dioxins and furans, which severely damage the surrounding ecological environment and the health of residents, and the environmental crisis caused by plastic waste is urgent.

[0003] On the other hand, the demand for polyethylene pipes in many key fields such as building water supply and drainage, gas transportation, and agricultural irrigation is increasing year by year like a snowball. Polyethylene pipes have become the ideal choice in complex working conditions due to their good flexibility, low temperature resistance, and chemical corrosion resistance. However, traditional pipe production is highly dependent on new polyethylene raw materials, and oil resources are becoming increasingly scarce, making it difficult and costly to extract, causing raw material prices to fluctuate frequently. Pipe production companies are trapped in a cost quagmire and face the problem of unstable raw material supply, hindering their development.

[0004] Recycling of polyethylene waste seems to be a key to breaking the deadlock, but there are many obstacles in reality. The source of recycled materials is extremely diverse, with waste films, packaging bags, and injection molding rejects mixed in, and impurities such as sand, metal debris, and glue residues, greatly reducing the purity and performance of the pipe. Heat aging and mechanical damage during the recycling process damage the polyethylene molecular chain, resulting in uncontrolled melt flow rate and compromised mechanical properties, and inconsistent product quality. In addition, recycled materials have uneven color and appearance, and the market acceptance is low. At present, environmental regulations are becoming increasingly stringent, and the concept of green consumption is deeply rooted in people's minds, and pipe companies urgently need an effective technology to comply with regulations and cater to the market while reducing costs and increasing efficiency. The present application was born to overcome these difficulties and unlock the infinite potential of polyethylene recycled materials in pipe manufacturing.

[0005] To solve these problems, it needs to be enhanced, toughened and stabilized, which can greatly improve its mechanical properties and reduce its possibility of oxidative degradation, so that its performance can be comparable to that of new plastics.

[0006] The patent with application number CN202311522174.X discloses a modified recycled polyethylene composition, which contains recycled polyethylene, polyethylene glycol, antioxidant, crosslinking agent and filler; the content of the polyethylene glycol is 1-15 parts by weight, the content of the antioxidant is 0.1-0.5 parts by weight, the content of the crosslinking agent is 0.1-5 parts by weight, and the content of the filler is 5-50 parts by weight, relative to 100 parts by weight of the recycled polyethylene.

[0007] The patent with application number CN201310029241.4 discloses a recycled polyethylene plastic special master batch, which comprises the following components in percentage by weight: calcium sulfate whisker 70-80 parts, high-grade fatty acid 0.5-0.6 parts, coupling agent 1-1.2 parts, liquid paraffin 1.5-2.5 parts, maleic anhydride 0.5-1 part, dicumyl peroxide 0.02-0.05 part, triphenyl phosphite 0.05-0.1 part, 2,6-di-tert-butyl phenol 0.05-0.1 part, and high-density polyethylene 16-25 parts; the coupling agent is titanium acid ester; the average diameter of the calcium sulfate whisker is 1-6 μm, and the average length is 50-200 μm; the high-grade fatty acid is stearic acid, palmitic acid or oleic acid; and the high-density polyethylene is high-density polyethylene with a melt index of 6-8 g / 10 min.

[0008] The patent with application number CN202410348061.0 discloses a halogen-free flame-retardant polyethylene material based on recycled polyethylene, which comprises the following preparation raw materials in mass fraction: 20-40 parts of recycled polyethylene, 10-50 parts of polyethylene resin, 20-40 parts of a compounded flame retardant, 0.05-2 parts of a flame-retardant synergist, 0.1-1 part of an anti-dripping agent, 3-10 parts of a toughening agent, and 1-10 parts of an auxiliary agent; the compounded flame retardant is compounded by piperazine pyrophosphate and polyphosphoric melamine; the synergistic flame retardant comprises at least one of zinc oxide, zinc borate, magnesium hydroxide or aluminum hydroxide; and the anti-dripping agent is selected from polytetrafluoroethylene.

[0009] A patent with application number CN202410088362.4 discloses a double-strengthened recycled polyethylene, which contains the following components: polyethylene recyclables, modifiers, polymerization agents, reinforcing agents, stabilizers, and fillers. The modifier is a combination of 1-octene and propylene in a mass ratio of 1:1-5. The polymerization agent is benzoyl peroxide. The reinforcing agent is a combination of reinforcing agent A and reinforcing agent B in a mass ratio of 1:0.2-0.7. Reinforcing agent A is selected from at least one of t-butyl phenyl diphenyl phosphate, dimethyl methylphosphonate, and tributyl phosphate. Reinforcing agent B is selected from at least one of adipic acid diester, diisopropyl malonate, and dibutyl sebacate. The stabilizer is a combination of natural paraffin wax and polyethylene wax in a mass ratio of 1:0.7-1. The content of the modifier is 0.5-1 parts by weight, the content of the polymerization agent is 1.6-3.5 parts by weight, the content of the reinforcing agent is 4.5-5.1 parts by weight, the content of the stabilizer is 1-1.8 parts by weight, and the content of the filler is 0.1-1 part by weight, relative to 100 parts by weight of polyethylene recyclables.

[0010] In the prior art, in order to improve the performance of recycled polyethylene, it is usually necessary to add various modifiers and / or reinforcing agents, etc., resulting in high cost of the product. SUMMARY

[0011] The present application provides a low-cost polyethylene composition and its application, which comprehensively considers the mechanical properties and cost, maintains the high mechanical properties of polyethylene recyclables doped pipe materials, and reduces the cost of the pipe material by more than 10%. The technical scheme provided by the present application is as follows: In one aspect, the present application provides a low-cost polyethylene composition made from the following raw materials by weight: 45-65 parts of recycled polyethylene, 40-50 parts of filler, 0.05-0.3 parts of antioxidant, and 1-10 parts of interfacial compatibilizer. The recycled polyethylene is selected from at least two of flower ethylene recyclables, blue barrel recyclables, and PE film recyclables. The filler at least includes calcium carbonate filler, including or not including talc powder filler. The composition also adds coupling agent or toughening agent. If the coupling agent is added, the amount of the coupling agent is 0.2-0.6 parts. If the toughening agent is added, the amount of the toughening agent is 1-10 parts. The flower ethylene recyclables are derived from dishwashing liquid bottles and laundry detergent bottles. The blue barrel recyclables are derived from waste blue plastic barrels at hazardous waste treatment stations. The PE film recyclables are derived from waste PE film. The interfacial compatibilizer is selected from polyethylene grafted maleic anhydride or polypropylene grafted maleic anhydride, etc., and is preferably polyethylene grafted maleic anhydride. The antioxidant is selected from antioxidant 1010, etc. The coupling agent is selected from KH550, KH560, or KH570, etc., and is preferably KH550. The toughening agent is selected from POE polyolefin elastomer, etc.

[0012] The silane coupling agent or toughening agent and the interfacial compatibilizer are used in cooperation to promote the dispersion of the filler and improve the tensile strength, tensile modulus, bending strength and bending modulus of the pipe material, and the addition of the interfacial compatibilizer improves the impact resistance of the pipe material.

[0013] Preferably, the recycled polyethylene in the embodiment of the present application is selected from the flower B material recycled material and the big blue barrel recycled material, the amount of the flower B material recycled material is 20-50 parts by weight, and the amount of the big blue barrel recycled material is 5-30 parts.

[0014] Preferably, the filler in the embodiment of the present application includes calcium carbonate filler and talcum powder filler, the amount of the calcium carbonate filler is 5-60 parts by weight, and the amount of the talcum powder filler is 5-30 parts by weight. The calcium carbonate filler includes light calcium carbonate and / or heavy calcium carbonate, the particle size of the light calcium carbonate is less than 10 μm, and the particle size of the heavy calcium carbonate is 1500-3000 mesh.

[0015] Preferably, the low-cost polyethylene composition in the embodiment of the present application is made of the following raw materials in parts by weight: flower B material recycled material 20-50 parts by weight, big blue barrel recycled material 5-30 parts, calcium carbonate filler 5-60 parts, talcum powder filler 5-30 parts by weight, antioxidant 1010 0.05-0.3 parts, polyethylene grafted maleic anhydride 1-10 parts, and KH550 0.2-0.6 parts.

[0016] More preferably, the low-cost polyethylene composition in the embodiment of the present application is made of the following raw materials in parts by weight: flower B material recycled material 38-45 parts by weight, big blue barrel recycled material 7-10 parts, calcium carbonate filler 25-35 parts, talcum powder filler 10-20 parts by weight, antioxidant 1010 0.05-0.3 parts, polyethylene grafted maleic anhydride 2-6 parts, and KH550 0.2-0.6 parts.

[0017] Most preferably, the low-cost polyethylene composition in the embodiment of the present application is made of the following raw materials in parts by weight: flower B material recycled material 42 parts by weight, big blue barrel recycled material 8 parts, calcium carbonate filler 30 parts, talcum powder filler 15 parts by weight, antioxidant 1010 0.1 parts, polyethylene grafted maleic anhydride 5 parts, and KH550 0.4 parts.

[0018] Preferably, the low-cost polyethylene composition in the embodiment of the present application is made of the following raw materials in parts by weight: flower B material recycled material 20-50 parts by weight, big blue barrel recycled material 5-30 parts, calcium carbonate filler 5-60 parts, talcum powder filler 5-30 parts by weight, antioxidant 1010 0.05-0.3 parts, polyethylene grafted maleic anhydride 1-10 parts, and POE polyolefin elastomer 1-10 parts.

[0019] More preferably, the low-cost polyethylene composition in the embodiments of the present application is made from the following raw materials by weight: flower ethylene recovery material 38-45 parts by weight, large blue barrel recovery material 7-10 parts, calcium carbonate filler 25-35 parts, talcum powder filler 10-20 parts by weight, antioxidant 1010 0.05-0.3 parts, polyethylene grafted maleic anhydride 2-6 parts and POE polyolefin elastomer 1-8 parts.

[0020] Most preferably, the low-cost polyethylene composition in the embodiments of the present application is made from the following raw materials by weight: flower ethylene recovery material 40 parts by weight, large blue barrel recovery material 9 parts, calcium carbonate filler 31 parts, talcum powder filler 15 parts by weight, antioxidant 1010 0.1 parts, polyethylene grafted maleic anhydride 3 parts and POE polyolefin elastomer 2 parts.

[0021] In another aspect, the embodiments of the present application also provide a preparation method of the aforementioned low-cost polyethylene composition. The recycled polyethylene is washed and crushed, and then mixed with fillers, antioxidants, interfacial compatibilizers and additives according to the ratio, the additives being selected from one of coupling agents or toughening agents; and the mother granules are obtained by extrusion at 170-220℃. The mother granules can be used as raw materials to prepare corresponding products.

[0022] Specifically, a sample bar is prepared from the low-cost polyethylene composition of the present application for mechanical experiments, the process being as follows: using a banbury mixer, various raw materials are mixed according to the formula at 200℃ for 20min, and then quickly cut into pieces; then using a micro injection molding machine, the sample is prepared into a sample bar, the injection molding temperature being 240℃, the injection molding time being 18s, the mold closing time being 2s, the cooling time being 3s, and the mold being dumbbell-shaped and square-shaped.

[0023] In another aspect, the embodiments of the present application also provide the use of the aforementioned low-cost polyethylene composition as raw materials for pipe materials. The pipe materials are specifically drainage pipes, gas conveying pipes and irrigation pipes, etc. The pipe materials have high requirements for bending strength and impact resistance.

[0024] The present application has the following advantages: (1) The low-cost polyethylene recovery material is used to replace the new polyethylene material.

[0025] (2) The components are simple.

[0026] (3) When the coupling agent is used together with the interfacial compatibilizer, or the interfacial compatibilizer is used together with the toughening agent, the mechanical strength can be improved and the high impact resistance can be maintained. The tensile strength is greater than or equal to 28Mpa, the bending strength is greater than or equal to 27.5Mpa, and the impact resistance is 16.5KJ / m 2 .

[0027] (4) The mechanical properties of the pipe material doped with the polyethylene recovery material are maintained, and at the same time, the cost of the pipe material is reduced by more than 10%. Attached Figure Description

[0028] Figure 1 This is a table comparing the formulations of the examples and comparative examples; Figure 2 This is a table comparing the mechanical properties of the embodiments and comparative examples; In Table 2, blue represents the lowest, yellow represents the second highest, and green represents the highest. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Example 1: Formula design: 42 parts of polyvinyl acetate, 8 parts of blue granules, 30 parts of stone powder, 15 parts of talc, 5 parts of polyethylene grafted maleic anhydride, 0.4 parts of coupling agent, and 0.1 parts of antioxidant (1010). Using an internal mixer, all raw materials were mixed at 200℃ for 20 minutes according to the formula, and then quickly shredded. Then, a micro-injection molding machine was used to make sample strips. The injection temperature was 240℃, the injection time was 18s, the mold closing time was 2s, and the cooling time was 3s. Dumbbell-shaped and square molds were used. The tensile strength was 28.02MPa, the tensile modulus was 2.73GPa, the flexural strength was 27.95MPa, the flexural modulus was 1.4MPa, and the impact strength was 18.01KJ / m. 2 The cost of raw materials is 3425 yuan / ton.

[0031] Example 2: Design formula: 40 parts of polyvinyl acetate, 9 parts of blue barrel, 31 parts of stone powder, 15 parts of talc powder, 3 parts of polyethylene grafted maleic anhydride, 2 parts of POE polyolefin elastomer, and 0.1 parts of antioxidant (1010). Using an internal mixer, all raw materials were mixed at 200℃ for 20 minutes according to the formula, and then quickly shredded. Then, a micro-injection molding machine was used to make sample strips. The injection temperature was 240℃, the injection time was 18s, the mold closing time was 2s, and the cooling time was 3s. Dumbbell-shaped and square molds were used. The tensile strength was 29.27MPa, the tensile modulus was 1.22GPa; the flexural strength was 28.01MPa, the flexural modulus was 1.61MPa, and the impact strength was 16.78KJ / m. 2 The cost of raw materials is 3,526 yuan per ton.

[0032] Comparative Example 1: Design formula: polyethylene new material 16.9 parts, flower ethylene material 24.9 parts, polyethylene pipe recycling material 13.9 parts, stone powder 30.88 parts, talcum powder 12.92 parts, KH550 coupling agent 0.4 parts, antioxidant (1010) 0.1 part; use the internal mixer, according to the formula, various raw materials are mixed at 200 DEG C for 20 min, and are quickly cut; then use the micro injection molding machine, the sample is made into a sample strip, the injection molding temperature is 240 DEG C, the injection molding time is 18 s, the mold closing time is 2 s, the cooling time is 3 s, and the mold uses dumbbell type and square type. After detection, the tensile strength is 20.8 MPa, the tensile modulus is 1.68 GPa; the bending strength is 22.6 MPa, the bending modulus is 1.65 MPa, and the impact strength is 17.41 KJ / m 2 . The raw material cost is 3432 yuan / ton.

[0033] Comparative example 2: Design formula: polyethylene new material (density 0.952-0.958 g / cm 2 , melt flow rate: 0.15-0.25 g / 10 min, molecular weight 25-35 million, same below) 16.9 parts, flower ethylene material 24.9 parts, polyethylene pipe recycling material 13.9 parts, stone powder 43.8 parts, KH550 coupling agent 0.4 parts, antioxidant (1010) 0.1 part; use the internal mixer, according to the formula, various raw materials are mixed at 200 DEG C for 20 min, and are quickly cut; then use the micro injection molding machine, the sample is made into a sample strip, the injection molding temperature is 240 DEG C, the injection molding time is 18 s, the mold closing time is 2 s, the cooling time is 3 s, and the mold uses dumbbell type and square type. After detection, the tensile strength is 22.1 MPa, the tensile modulus is 1.57 GPa; the bending strength is 23.9 MPa, the bending modulus is 1.64 MPa, and the impact strength is 24.67 KJ / m 2 . The raw material cost is 3353.4 yuan / ton.

[0034] Comparative example 3: Design formula: flower ethylene material 44.2 parts, big blue barrel 8 parts, stone powder 32.4 parts, talcum powder 15 parts, coupling agent 0.4 parts, antioxidant (1010) 0.1 part; use the internal mixer, according to the formula, various raw materials are mixed at 200 DEG C for 20 min, and are quickly cut; then use the micro injection molding machine, the sample is made into a sample strip, the injection molding temperature is 240 DEG C, the injection molding time is 18 s, the mold closing time is 2 s, the cooling time is 3 s, and the mold uses dumbbell type and square type. After detection, the tensile strength is 20.88 MPa, the tensile modulus is 1.82 GPa; the bending strength is 25.60 MPa, the bending modulus is 1.50 MPa, and the impact strength is 6.84 KJ / m 2 . The raw material cost is 3046 yuan / ton.

[0035] Comparative example 4: Design formula: flower B material 42 parts, big blue bucket 9 parts, stone powder 46 parts, polyethylene grafted maleic anhydride 3 parts, antioxidant (1010) 0.1 part; use the internal mixer, according to the formula, various raw materials are mixed at 200 DEG C for 20 min, and are quickly cut; then use the micro injection molding machine, the sample is made into sample strip, the injection molding temperature is 240 DEG C, the injection molding time is 18 s, the mold closing time is 2 s, the cooling time is 3 s, the mold uses dumbbell type and square type. After detection, the tensile strength is 27.71 MPa, the tensile modulus is 1.6 GPa; the bending strength is 26.4 MPa, the bending modulus is 1.34 MPa, the impact strength is 18.11 KJ / m 2 The raw material cost is 3205 yuan / ton.

[0036] Comparative example 5: Design formula: flower B material 40 parts, big blue bucket 9 parts, stone powder 31 parts, talc powder 15 parts, POE polyolefin elastomer 5 parts, antioxidant (1010) 0.1 part; use the internal mixer, according to the formula, various raw materials are mixed at 200 DEG C for 20 min, and are quickly cut; then use the micro injection molding machine, the sample is made into sample strip, the injection molding temperature is 240 DEG C, the injection molding time is 18 s, the mold closing time is 2 s, the cooling time is 3 s, the mold uses dumbbell type and square type. After detection, the tensile strength is 24.66 MPa, the tensile modulus is 1.45 GPa; the bending strength is 23.17 MPa, the bending modulus is 1.53 MPa, the impact strength is 15.28 KJ / m 2 The raw material cost is 3697 yuan / ton.

[0037] Comparative example 6: Formula: flower B material 25.46 parts, big blue bucket 13.48 parts, polyethylene new material 13.48 parts, polyethylene pipe waste 6.74 parts; talc powder 13.48 parts, stone powder 26.96 parts, KH550 coupling agent 0.4 parts, antioxidant (1010) 0.1 part; use the internal mixer, according to the formula, various raw materials are mixed at 200 DEG C for 20 min, and are quickly cut; then use the micro injection molding machine, the sample is made into sample strip, the injection molding temperature is 240 DEG C, the injection molding time is 18 s, the mold closing time is 2 s, the cooling time is 3 s, the mold uses dumbbell type and square type. After detection, the tensile strength is 24.48 MPa, the tensile modulus is 1.58 GPa; the bending strength is 23.27 MPa, the bending modulus is 1.48 MPa, the impact strength is 29.48 KJ / m 2 The raw material cost is 3704 yuan / ton.

[0038] Among them, the comparative example 1 is a new material and a recycled material blended together, the mechanical properties such as tensile strength meet the requirements, the impact resistance is also good, and the cost is slightly high. The comparative example 2 compared with the comparative example 1, the talc powder is removed, the tensile strength, modulus and bending performance are slightly sacrificed, but the cost is reduced, and the impact resistance is further improved. The comparative example 3 completely removes the new material, only uses the flower ethylene material and the large blue barrel waste, and increases the fraction of the filler, increases the rigidity, reduces the cost, but the impact resistance is poor. The comparative example 4 and the comparative example 3 are different: the coupling agent is replaced by the interfacial compatibilizer, the strength is increased, the impact resistance is also good, and the cost is moderate. The comparative example 5 uses a toughening agent instead of a coupling agent and an interfacial compatibilizer, the mechanical properties of the material are not as good as those of the comparative example 4 and the example 1, and the cost is higher. The comparative example 6 does not use the interfacial compatibilizer and the toughening agent, uses the new material and the recycled material together, although the impact strength is high, but the cost is the highest.

[0039] From the above examples and comparative examples, it can be seen that the use of new materials has higher impact strength, but the cost is higher; the use of talc filler further improves the impact strength. The interfacial compatibilizer and the toughening agent both have the effect of improving the mechanical properties (tensile strength, bending strength and impact strength), but will significantly increase the cost, especially the toughening agent.

[0040] The above only describes the preferred embodiments of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low-cost polyethylene composition, characterized in that, It is made from the following raw materials in parts by weight: 45-65 parts recycled polyethylene, 40-50 parts filler, 0.05-0.3 parts antioxidant and 1-10 parts interface compatibilizer; The recycled polyethylene is selected from at least two of recycled polyethylene materials, recycled PE film materials, and recycled PE materials; the filler includes at least calcium carbonate filler, and may or may not include talc filler; the composition also contains a coupling agent or a toughening agent, wherein the amount of the coupling agent is 0.2-0.6 parts, and the amount of the toughening agent is 1-10 parts.

2. The low-cost polyethylene composition according to claim 1, characterized in that, The recycled ethylene ester material comes from detergent bottles and laundry liquid bottles, the recycled blue bucket material comes from waste blue plastic buckets from hazardous waste treatment plants, and the recycled PE film material comes from waste PE film.

3. The low-cost polyethylene composition according to claim 1, characterized in that, The recycled polyethylene is selected from recycled polyethylene ether and recycled polyethylene in large blue barrels. The amount of recycled polyethylene ether is 20-50 parts by weight, and the amount of recycled polyethylene in large blue barrels is 5-30 parts.

4. The low-cost polyethylene composition according to claim 1, characterized in that, The filler includes calcium carbonate filler and talc filler, wherein the amount of calcium carbonate filler is 5-60 parts by weight and the amount of talc filler is 5-30 parts by weight; the calcium carbonate filler includes light calcium carbonate and / or heavy calcium carbonate, wherein the particle size of light calcium carbonate is less than 10 μm and the particle size of heavy calcium carbonate is 1500-3000 mesh.

5. The low-cost polyethylene composition according to claim 1, characterized in that, The interface compatibilizer is selected from polyethylene grafted with maleic anhydride or polypropylene grafted with maleic anhydride, the antioxidant is selected from antioxidant 1010, the coupling agent is selected from KH550, KH560 or KH570, and the toughening agent is selected from POE polyolefin elastomer.

6. The low-cost polyethylene composition according to claim 1, characterized in that, It is made from the following raw materials in parts by weight: 20-50 parts of recycled ethylene oxide, 5-30 parts of recycled blue barrel material, 5-60 parts of calcium carbonate filler, 5-30 parts of talc filler, 0.05-0.3 parts of antioxidant 1010, 1-10 parts of polyethylene grafted maleic anhydride and 0.2-0.6 parts of KH550.

7. The low-cost polyethylene composition according to claim 1, characterized in that, It is made from the following raw materials in parts by weight: 20-50 parts of recycled ethylene oxide, 5-30 parts of recycled blue barrel material, 5-60 parts of calcium carbonate filler, 5-30 parts of talc filler, 0.05-0.3 parts of antioxidant 1010, 1-10 parts of polyethylene grafted maleic anhydride and 1-10 parts of POE polyolefin elastomer.

8. The low-cost polyethylene composition according to claim 1, characterized in that, It is made from the following raw materials in parts by weight: 42 parts by weight of recycled ethylene oxide, 8 parts by weight of recycled blue barrel material, 30 parts by weight of calcium carbonate filler, 15 parts by weight of talc filler, 0.1 parts by weight of antioxidant 1010, 5 parts by weight of polyethylene grafted maleic anhydride and 0.4 parts by weight of KH550.

9. The low-cost polyethylene composition according to claim 1, characterized in that, It is made from the following raw materials in parts by weight: 40 parts by weight of recycled ethylene oxide, 9 parts by weight of recycled blue barrels, 31 parts by weight of calcium carbonate filler, 15 parts by weight of talc filler, 0.1 parts by weight of antioxidant 1010, 3 parts by weight of polyethylene grafted maleic anhydride and 2 parts by weight of POE polyolefin elastomer.

10. The application of the low-cost polyethylene composition according to any one of claims 1-9, characterized in that, As a raw material for pipes.

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