A soil-resistant polyethylene material and a method for producing the same

Abstract

The application provides an anti-fouling polyethylene material and a preparation method thereof. The anti-fouling polyethylene material is prepared from the following components in parts by weight: polyethylene 45-70 parts, perfluoroethylene propylene copolymer 10-20 parts, nano diatomite 5-15 parts, nano titanium dioxide 5-10 parts, nano aluminum nitride 5-10 parts, dispersing agent 0.4 part, lubricant 0.3 part, and antioxidant 0.5 part. The ceramic powder prepared by compounding is used as an additive for preventing fouling and scaling, the hardness and hydrophobicity of the surface of the product are improved, the adsorption and agglomeration of stains of diatomite are combined, and the polyethylene composite material with good surface performance and good anti-fouling performance is obtained.

Description

Technical Field

[0001] This invention relates to the field of modified materials technology, specifically to an anti-fouling polyethylene material and its preparation method. Background Technology

[0002] Antifouling materials, developed based on our understanding of the functions, structures, and principles of various organisms in nature, allow water and oil to easily slide across their surfaces without leaving any marks. Research on antifouling materials has long held broad application prospects and significant practical importance.

[0003] Domestic and international scholars have developed antifouling materials on various substrates (such as glass, metal, and polymers) using diverse processing techniques. Based on different antifouling principles, these materials are mainly categorized into three types: superhydrophobic, superhydrophilic, and superoleophobic surfaces. Currently, several techniques exist for preparing superhydrophilic antifouling surfaces, such as dip coating, sol-gel, inductively coupled plasma etching, and nanosecond lasers. From a practical perspective, research on superhydrophilic antifouling materials primarily focuses on TiO2 photoinduced superhydrophilic materials based on glass substrates (such as automotive windshields, rearview mirrors, and architectural glass). This is because the photocatalytic effect of TiO2 can effectively degrade surface contaminants, while also exhibiting photoinduced superhydrophilic properties. However, these technologies are quite expensive to manufacture or require costly specialized equipment, limiting their widespread application.

[0004] Perfluoroethylene-propylene copolymer (PFRC) is a copolymer of tetrafluoroethylene and hexafluoropropylene. It possesses properties similar to polytetrafluoroethylene (PTFE) while also exhibiting the good processing performance of thermoplastics. Therefore, it overcomes the processing difficulties of PTFE, making it a viable alternative. In wire and cable production, it is widely used in transmission wires for electronic devices operating at high temperatures and frequencies, internal wiring for computers, aerospace wiring and special-purpose installation wires, oil pump cables, and insulation layers for submersible motor windings. Summary of the Invention

[0005] This invention provides a stain-resistant polyethylene material and its preparation method.

[0006] The technical solution of the present invention is as follows:

[0007] A stain-resistant polyethylene material, which is prepared from the following components in parts by weight:

[0008]

[0009] In a further embodiment, the polyethylene is one or more of high-density polyethylene, low-density polyethylene, or linear low-density polyethylene mixed in any proportion;

[0010] The perfluoroethylene-propylene copolymer is a powder, which is a commercially available product, grade DS605, purchased from Shandong Huaxia Shenzhou.

[0011] The nano-diatomite is a commercially available product with a silica content of ≥60%, grade LH-880, purchased from Shenyang Taioke Chemical Co., Ltd.

[0012] The nano-titanium dioxide is rutile nano-titanium dioxide, grade JWN-R15, purchased from Ningbo Jiwei Nano New Materials Technology Co., Ltd.

[0013] The dispersant is a mixture of two or three of sodium dodecyl sulfate, potassium hexadecyl phosphate, and glucon;

[0014] The lubricant is a mixture of calcium stearate and ethylene bis-stearamide in a mass ratio of 1:1.

[0015] The antioxidant is at least three of the following: pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (1010), octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (1076), tris-(2,4-di-tert-butylphenyl)phosphite (168), and dioctadecyl thiodipropionate (DSTDP).

[0016] Another objective of this invention is to provide a method for preparing the aforementioned antifouling polyethylene material. The method involves mixing 45-70 parts of polyethylene, 10-20 parts of perfluoroethylene-propylene copolymer powder, 5-15 parts of nano-diatomaceous earth, 5-10 parts of nano-titanium dioxide, 5-10 parts of nano-aluminum nitride, 0.4 parts of dispersant, 0.3 parts of lubricant, and 0.5 parts of antioxidant in a high-speed mixer for 5-15 minutes. The uniformly mixed material is then added to a twin-screw extruder for compounding, extrusion, cooling, and pelletizing to obtain polyethylene composite granules. The extrusion temperatures in each extrusion zone of the twin-screw extruder are 155-165℃, 160-170℃, 160-170℃, 160-170℃, 170-180℃, 170-180℃, 170-180℃, 170-180℃, 170-180℃, and 180-190℃.

[0017] The anti-fouling polyethylene material prepared by this invention improves the surface hardness and hydrophobicity of the product by using compounded ceramic powder as an anti-fouling and anti-scaling additive, and combines the ability of diatomaceous earth to adsorb and agglomerate stains, resulting in a polyethylene composite material with good surface properties and good anti-fouling performance.

[0018] The addition of perfluoroethylene propylene copolymer in this invention can improve the processing performance of thermoplastic plastics.

[0019] The present invention incorporates a compound of perfluoroethylene propylene copolymer, nano-diatomaceous earth, nano-titanium dioxide, and nano-aluminum nitride, which exhibits a good synergistic effect. This is because the internal microstructure of a single filler powder is relatively simple and its orientation is obvious, which can easily lead to filling defects in some areas. The complex microstructure of the filler system can effectively avoid this deficiency, and the nano-diatomaceous earth itself also has a significant anti-fouling effect.

[0020] The composite resin of the present invention has the following advantages:

[0021] (1) The compound additives used in this invention are all commercially available conventional additives, and the compound performance is significantly better than the effect of adding one of the additives alone.

[0022] (2) The present invention uses a conventional material modification method, which has low processing cost and is easy to widely produce and apply. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments (the present invention includes, but is not limited to, the embodiments described below).

[0024] The polyethylene mentioned in the examples is high-density polyethylene of grade HDPE-8008, purchased from Fujian United Petrochemical.

[0025] The perfluoroethylene propylene copolymer powder is a commercially available product, brand name DS605, purchased from Shandong Huaxia Shenzhou.

[0026] The nano-diatomite is a commercially available product with a silica content of ≥60%, grade LH-880, purchased from Shenyang Taioke Chemical Co., Ltd.

[0027] The nano-titanium dioxide is rutile nano-titanium dioxide, grade JWN-R15, purchased from Ningbo Jiwei Nano New Materials Technology Co., Ltd.

[0028] The dispersant is a mixture of sodium dodecyl sulfate and potassium hexadecyl phosphate in a mass ratio of 1:1;

[0029] The antioxidant is a mixture of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (1010), tris-(2,4-di-tert-butylphenyl)phosphite (168), and dioctadecyl thiodipropionate (DSTDP) in a mass ratio of 2:2:1.

[0030] Example 1

[0031] 70 parts of polyethylene, 10 parts of perfluoroethylene-propylene copolymer powder, 5 parts of nano diatomaceous earth, 5 parts of nano titanium dioxide, 10 parts of nano aluminum nitride, 0.4 parts of dispersant, 0.3 parts of lubricant, and 0.5 parts of antioxidant were added to a high-speed mixer and mixed for 5 minutes. The uniformly mixed material was then added to a twin-screw extruder for kneading, extrusion, cooling, and pelletizing to obtain polyethylene composite material pellets. The extrusion temperatures of each extrusion zone in the twin-screw extruder were 155℃, 160℃, 160℃, 160℃, 170℃, 170℃, 170℃, 170℃, 170℃, and 180℃, respectively.

[0032] Example 2

[0033] 60 parts of polyethylene, 15 parts of perfluoroethylene-propylene copolymer powder, 10 parts of nano diatomaceous earth, 10 parts of nano titanium dioxide, 5 parts of nano aluminum nitride, 0.4 parts of dispersant, 0.3 parts of lubricant, and 0.5 parts of antioxidant were added to a high-speed mixer and mixed for 10 minutes. The uniformly mixed material was then added to a twin-screw extruder for kneading, extrusion, cooling, and pelletizing to obtain polyethylene composite granules. The extrusion temperatures of each extrusion zone in the twin-screw extruder were 160℃, 165℃, 165℃, 165℃, 175℃, 175℃, 175℃, 175℃, 175℃, and 185℃, respectively.

[0034] Example 3

[0035] 45 parts of polyethylene, 20 parts of perfluoroethylene-propylene copolymer powder, 15 parts of nano diatomaceous earth, 10 parts of nano titanium dioxide, 10 parts of nano aluminum nitride, 0.4 parts of dispersant, 0.3 parts of lubricant, and 0.5 parts of antioxidant were added to a high-speed mixer and mixed for 15 minutes. The uniformly mixed material was then added to a twin-screw extruder for kneading, extrusion, cooling, and pelletizing to obtain polyethylene composite material pellets. The extrusion temperatures of each extrusion zone in the twin-screw extruder were 165℃, 170℃, 170℃, 170℃, 180℃, 180℃, 180℃, 180℃, 180℃, and 190℃, respectively.

[0036] The performance test results of the materials prepared in Examples 1-3 are shown in Table 1:

[0037] Table 1

[0038] Test Items / Units Test Standards Example 1 Example 2 Example 3 Surface hardness / Rockwell GB / T 3398.2 57 61 69 Water contact angle / ° GB / T 30963 121 124 125 Castor oil contact angle / ° GB / T 30963 113 116 118

[0039] Comparative Example 1

[0040] 75 parts of polyethylene, 10 parts of nano diatomaceous earth, 10 parts of nano titanium dioxide, 5 parts of nano aluminum nitride, 0.4 parts of dispersant, 0.3 parts of lubricant, and 0.5 parts of antioxidant were added to a high-speed mixer and mixed for 10 minutes. The uniformly mixed material was then added to a twin-screw extruder for kneading, extrusion, cooling, and pelletizing to obtain polyethylene composite granules. The extrusion temperatures of each extrusion zone in the twin-screw extruder were 160℃, 165℃, 165℃, 165℃, 175℃, 175℃, 175℃, 175℃, 175℃, and 185℃, respectively.

[0041] The performance test results are shown in Table 2.

[0042] Comparative Example 2

[0043] 70 parts of polyethylene, 15 parts of perfluoroethylene-propylene copolymer powder, 10 parts of nano titanium dioxide, 5 parts of nano aluminum nitride, 0.4 parts of dispersant, 0.3 parts of lubricant, and 0.5 parts of antioxidant were added to a high-speed mixer and mixed for 10 minutes. The uniformly mixed material was then added to a twin-screw extruder for kneading, extrusion, cooling, and pelletizing to obtain polyethylene composite granules. The extrusion temperatures of each extrusion zone in the twin-screw extruder were 160℃, 165℃, 165℃, 165℃, 175℃, 175℃, 175℃, 175℃, 175℃, and 185℃, respectively.

[0044] The performance test results are shown in Table 2.

[0045] Comparative Example 3

[0046] 60 parts of polyethylene, 15 parts of perfluoroethylene-propylene copolymer powder, 10 parts of nano diatomaceous earth, 15 parts of nano titanium dioxide, 0.4 parts of dispersant, 0.3 parts of lubricant, and 0.5 parts of antioxidant were added to a high-speed mixer and mixed for 10 minutes. The uniformly mixed material was then added to a twin-screw extruder for kneading, extrusion, cooling, and pelletizing to obtain polyethylene composite granules. The extrusion temperatures of each extrusion zone in the twin-screw extruder were 160℃, 165℃, 165℃, 165℃, 175℃, 175℃, 175℃, 175℃, 175℃, and 185℃, respectively.

[0047] The performance test results are shown in Table 2.

[0048] Comparative Example 4

[0049] 60 parts of polyethylene, 15 parts of perfluoroethylene-propylene copolymer powder, 10 parts of nano diatomaceous earth, 15 parts of nano aluminum nitride, 0.4 parts of dispersant, 0.3 parts of lubricant, and 0.5 parts of antioxidant were added to a high-speed mixer and mixed for 10 minutes. The uniformly mixed material was then added to a twin-screw extruder for kneading, extrusion, cooling, and pelletizing to obtain polyethylene composite granules. The extrusion temperatures of each extrusion zone in the twin-screw extruder were 160℃, 165℃, 165℃, 165℃, 175℃, 175℃, 175℃, 175℃, 175℃, and 185℃, respectively.

[0050] The performance test results are shown in Table 2.

[0051] Table 2

[0052]

[0053] As can be seen from the data in Tables 1 and 2, the anti-fouling polyethylene material prepared by the present invention achieves the effect that cannot be achieved by adding an equal amount of a single additive or filler by combining different modified additives and fillers. It has the dual effect of resisting water-based stains and oil-based stains, and the surface properties of the material are also significantly improved.

[0054] Compared with Comparative Example 1, Comparative Example 1 did not contain perfluoroethylene propylene copolymer powder, resulting in slightly lower overall rigidity and poorer antifouling performance of the material.

[0055] In Comparative Examples 2-4, only a single additive was added, and their performance was significantly lower than that of Example 2. Furthermore, Comparative Example 2 did not contain nano-diatomaceous earth, which has inherent antifouling properties, so its apparent antifouling performance was the worst.

[0056] The materials prepared by this invention have high surface hardness, which can prevent the materials from being damaged by other substances and produce tiny pores that can accommodate stains, thereby improving the stain resistance of the materials.

[0057] The above description of the embodiments is provided to enable those skilled in the art to understand and apply the present invention. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the embodiments described herein, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A stain-resistant polyethylene material, characterized in that: It is prepared from the following components in parts by weight: 45-70 parts of polyethylene 10-20 parts of perfluoroethylene-propylene copolymer 5-15 parts of nano diatomaceous earth 5-10 parts of nano titanium dioxide 5-10 parts of nano aluminum nitride 0.4 parts dispersant 0.3 parts lubricant Antioxidant 0.5 parts; The mass percentage of silicon dioxide in the nano-diatomite is ≥60%; The nano-titanium dioxide is rutile-type nano-titanium dioxide.

2. The antifouling polyethylene material according to claim 1, characterized in that: The polyethylene is at least one of high-density polyethylene, low-density polyethylene, or linear low-density polyethylene.

3. The anti-fouling polyethylene material according to claim 1, characterized in that: The dispersant is a mixture of at least two of sodium dodecyl sulfate, potassium hexadecyl phosphate, and glucon.

4. The antifouling polyethylene material according to claim 1, characterized in that: The lubricant is a mixture of calcium stearate and ethylene bis-stearamide in a mass ratio of 1:

1.

5. The antifouling polyethylene material according to claim 1, characterized in that: The antioxidant is at least three of the following: pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris-(2,4-di-tert-butylphenyl)phosphite, and dioctadecyl thiodipropionate.

6. The method for preparing an antifouling polyethylene material as described in claim 1, characterized in that: 45-70 parts of polyethylene, 10-20 parts of perfluoroethylene-propylene copolymer, 5-15 parts of nano diatomaceous earth, 5-10 parts of nano titanium dioxide, 5-10 parts of nano aluminum nitride, 0.4 parts of dispersant, 0.3 parts of lubricant, and 0.5 parts of antioxidant are added to a high-speed mixer and mixed for 5-15 minutes. The uniformly mixed material is then added to a twin-screw extruder for kneading, extrusion, cooling, and pelletizing to obtain polyethylene composite granules.

7. The preparation method according to claim 6, characterized in that: The extrusion temperatures of each extrusion zone in the twin-screw extruder are 155-165℃, 160-170℃, 160-170℃, 160-170℃, 170-180℃, 170-180℃, 170-180℃, 170-180℃, 170-180℃, and 180-190℃.

Images