Water and oxygen barrier polyethylene composite and method for preparing the same

Abstract

The application provides a water and oxygen resistant polyethylene composite material and a preparation method thereof. The water and oxygen resistant polyethylene composite material is prepared from the following components in parts by weight: 80-95 parts of polyethylene, 5-20 parts of ethylene-vinyl alcohol copolymer, 2-10 parts of hydroxylated glass fiber, 2-8 parts of montmorillonite, 0.5-4 parts of polyhydroxy sulfonic acid quaternary ammonium salt and 0.1-3 parts of an auxiliary. The composite material provided by the application has high oxygen resistance and water resistance, and the tensile property and impact strength also meet the use requirements, and is suitable for the preparation of polyethylene films.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plastic packaging, and particularly relates to a water and oxygen resistant polyethylene composite material and a preparation method thereof. BACKGROUND

[0002] Polyethylene is one of commonly used packaging materials, and has advantages of low price, easy processing and stable chemical properties, and is widely applied in food and medical packaging. Barrier property is a basic requirement for packaging materials, and can prevent oxygen, water vapor and bacteria from invading from outside the packaging, thereby prolonging the shelf life of materials inside the packaging. Since polyethylene has low polarity, according to the principle of similar solubility, the water permeability of polyethylene is low, but the air permeability is high, that is, the oxygen resistance is poor.

[0003] Ethylene-vinyl alcohol copolymer (EVOH) has good processability of polyethylene and high gas barrier property of polyvinyl alcohol. The molecular chain of EVOH contains hydroxyl groups, and a large number of hydrogen bonds weaken the molecular chain movement, thereby increasing the compactness of the material, and thus the material has excellent gas barrier property. However, the high-polarity molecular structure of EVOH makes it have hydrophilicity and hygroscopicity, and the gas barrier property of EVOH decreases with the increase of humidity, and the barrier property sharply decreases under high humidity conditions.

[0004] Blending polyethylene with EVOH can take advantages of both and reduce cost, but the non-polar polyolefin and the high-polar barrier material EVOH have poor compatibility, and the blending of materials will destroy the continuity of the high-barrier material, thereby affecting the barrier property. In addition, the low mechanical strength of polyethylene is also a problem to be solved in the process of blending modification. Therefore, it is necessary to provide a polyethylene composite material with good water and oxygen resistance and mechanical properties meeting the use requirements, so as to solve the problems in the prior art. SUMMARY

[0005] The application aims to overcome the shortcomings of the prior art, and provides a water and oxygen resistant polyethylene composite material. The polyethylene composite material has high oxygen resistance and water resistance, and the tensile property and impact strength meet the use requirements, and is suitable for preparing polyethylene film and other packaging materials.

[0006] Another object of the application is to provide a preparation method of the water and oxygen resistant polyethylene composite material.

[0007] To solve the above technical problems, the application adopts the following technical scheme:

[0008] A water and oxygen resistant polyethylene composite material, which comprises the following raw material components in parts by weight

[0009]

[0010] Preferably, the polyethylene is at least one of low density polyethylene or high density polyethylene.

[0011] Further preferably, the polyethylene is a mixture of low density polyethylene and high density polyethylene, and the mass ratio of the low density polyethylene to the high density polyethylene is (60-65):(20-30).

[0012] Preferably, the hydroxylated glass fiber is obtained by heating and reacting glass fiber in a strong acid.

[0013] Further preferably, the hydroxylated glass fiber is obtained by heating and reacting glass fiber in a hydrochloric acid solution with a concentration of 8-20% at 90-100°C for 6-12h, and then washing and drying.

[0014] Preferably, the polyhydroxy sulfonic acid quaternary ammonium salt has a general structure as shown in formula (I):

[0015]

[0016] wherein n1, n2, n3 and n4 of the alkyl chain on the quaternary ammonium cation are independently selected from 1-18, and are not simultaneously 1; the anion containing R in formula (I) is

[0017] Preferably, the preparation method of the polyhydroxy sulfonic acid quaternary ammonium salt comprises the following steps:

[0018] S1, dissolving a halide salt of a quaternary ammonium compound in a solvent, exchanging the halide anion to hydroxide anion by a hydroxide exchange column to form a quaternary ammonium cation-containing hydroxide;

[0019] S2, adding a polyhydroxy sulfonic acid in an equimolar amount to the quaternary ammonium cation-containing hydroxide, stirring to perform neutralization reaction, and vacuum baking to remove the solvent to obtain the polyhydroxy sulfonic acid quaternary ammonium salt.

[0020] Preferably, the solvent in step S1 is a combination of one or more of water, methanol, ethanol, propanol, butanol, and isopropanol.

[0021] Preferably, the quaternary ammonium cation is a mixture of one or more of dodecyltrimethylammonium ion, tetradecyltrimethylammonium ion, hexadecyltrimethylammonium ion, octadecyltrimethylammonium ion, dioctyl dimethyl ammonium ion, didecyl dimethyl ammonium ion, didodecyl dimethyl ammonium ion, ditetradecyl dimethyl ammonium ion, dihexadecyl dimethyl ammonium ion, and dioctadecyl dimethyl ammonium ion.

[0022] Preferably, the polyhydroxy sulfonic acid is a mixture of one or more of 1,2-dihydroxyethanesulfonic acid, 2-(diethanolamino)ethanesulfonic acid, 3-[2-(4-hydroxybutoxy)-1-[(2-hydroxyethoxy)methyl]ethoxy]-1-propanesulfonic acid.

[0023] Preferably, the auxiliary agent includes a mixture of one or more of an antioxidant, an antistatic agent, a compatibilizer, a toughening agent.

[0024] Preferably, the method for preparing the water-oxygen barrier polyethylene composite material comprises the following steps:

[0025] S01, adding montmorillonite into deionized water, heating and stirring until the montmorillonite is fully dissolved, adding a polyhydroxy sulfonic acid quaternary ammonium salt and continuing to heat and react;

[0026] S02, adding hydroxylated glass fibers and stirring at room temperature to react;

[0027] S03, centrifuging, washing, and drying the product of step S02 to obtain an organic montmorillonite-glass fiber composite;

[0028] S04, blending polyethylene, ethylene-vinyl alcohol copolymer, the organic montmorillonite-glass fiber composite of step S03, and an auxiliary agent, heating and melting to mix, extruding and granulating to obtain the water-oxygen barrier polyethylene composite material.

[0029] Further preferably, the temperature of the heating in step S01 is 50-60℃, the temperature of the room temperature in step S02 is 10-40℃, and the temperature of the heating in step S04 is 180-230℃.

[0030] Further preferably, the heating reaction time in step S01 is 2-4h, and the stirring reaction time in step S02 is 2-4h.

[0031] Montmorillonite is a nano-dimension surface negative charged silicate sheet, which is in a layered structure. When used as a polymer filler, it can prolong the penetration path of moisture or small gas molecules in the material, which is helpful to improve the barrier property of the material. However, the presence of a large number of inorganic ions between the layers of nano-montmorillonite makes it exhibit hydrophilic and oleophobic properties, which is not conducive to its dispersion in polyethylene, thereby making the barrier property of the polyethylene material not obviously improved. On the other hand, for packaging materials such as polyethylene film with small thickness, in order to obtain high barrier property, more montmorillonite needs to be added. However, when the amount of montmorillonite is too much, the nanoparticles in the composite material are prone to agglomeration, which will cause the gas barrier property and mechanical property of the polymer to deteriorate significantly. The orientation degree of two-dimensional nanomaterials in the matrix material is closely related to the improvement of the gas barrier property, so it is very important to ensure its full distribution and arrangement to improve the barrier property while reducing the amount.

[0032] In the application, the montmorillonite is organically modified by using a polyhydroxy quaternary ammonium sulfonate. The quaternary ammonium cation is replaced with the interlayer cation of the montmorillonite, and an oleophilic alkyl chain segment is introduced on the surface of the montmorillonite sheet. The glass fiber is treated by acid erosion, and the Si-O structure on the surface is fully exposed to generate hydroxyl groups, which form hydrogen bonds with the hydroxyl groups of the polyhydroxy quaternary ammonium sulfonate, forming a composite of organically modified montmorillonite coated on the surface of the glass fiber. The glass fiber has high strength and high modulus, and when added to polyethylene, it can improve the mechanical properties and thermal stability of the material. During the molding process, the glass fiber is arranged in parallel along the stress (flow) direction, while the montmorillonite is arranged and distributed in the form of nanosheet along the direction of the glass fiber surface due to the hydrogen bonds between the polyhydroxy quaternary ammonium sulfonate and the hydroxylated glass fiber, forming a barrier layer, which is conducive to further improving the barrier effect.

[0033] In the application, the polyethylene, EVOH and organically modified montmorillonite-glass fiber composite are melt blended. The hydrogen bond force exists between the hydroxyl groups of EVOH and the hydroxyl groups on the organically modified montmorillonite-glass fiber composite, which increases the density of the material and improves the water and oxygen barrier properties. On the other hand, the alkyl chain segment of the quaternary ammonium cation in the organically modified montmorillonite-glass fiber composite is compatible with the polyethylene segment, so that the organically modified montmorillonite-glass fiber composite and EVOH form a stable dispersed phase in the polyethylene matrix.

[0034] Compared with the prior art, the application has the following beneficial effects:

[0035] (1) The present application mixes and reacts quaternary ammonium polyhydroxy sulfonate, montmorillonite and hydroxylated glass fiber, wherein the quaternary ammonium cation of the quaternary ammonium polyhydroxy sulfonate has an oleophilic alkane segment, which is introduced onto the surface of the montmorillonite by cation exchange to improve the hydrophobicity and compatibility with polyethylene, and the hydroxyl group of the quaternary ammonium polyhydroxy sulfonate forms a hydrogen bond with the hydroxyl group of the glass fiber to generate a composite of organic modified montmorillonite coated on the surface of the glass fiber. During the processing and molding, the glass fiber is arranged in parallel along the stress direction, and the montmorillonite is arranged and distributed in the form of nanosheet along the direction of the surface of the glass fiber. The impermeability of the montmorillonite and the glass fiber and the bending of the permeation path induced by the presence of nanomaterials reduce the permeation rate of gas and moisture, and the ordered arrangement and distribution of the nanosheet further improve the barrier effect.

[0036] (2) The present application uses ethylene-vinyl alcohol copolymer and organic modified montmorillonite-glass fiber composite to blend and modify polyethylene. The hydrogen bond between the hydroxyl group of EVOH and the hydroxyl group on the organic modified montmorillonite-glass fiber composite increases the density of the material and improves the barrier property. The good compatibility between the alkane segment of the quaternary ammonium cation in the organic modified montmorillonite-glass fiber composite and the polyethylene segment also improves the dispersion stability of the montmorillonite-glass fiber composite and EVOH in the polyethylene matrix. The two work together to improve the water and oxygen resistance and mechanical strength of the polyethylene. DETAILED DESCRIPTION

[0037] The present application will be further described in conjunction with specific examples, but the examples do not limit the present application in any form. Unless otherwise specified, the reagents, methods and equipment used in the present application are conventional reagents, methods and equipment in the technical field.

[0038] The following raw materials are used in the examples and comparative examples of the present application:

[0039] Low-density polyethylene (LDPE): MG70 from Qatar Petrochemical;

[0040] High-density polyethylene (HDPE): HD5502FT from Shanghai Sike;

[0041] Ethylene-vinyl alcohol copolymer (EVOH): F104B from Japan Kuraray;

[0042] PE-MAH compatibilizer: 41E710 from the United States DuPont;

[0043] Montmorillonite: K-10 from Shanghai Dibai;

[0044] Glass fiber: Weijia Composite Materials Co., Ltd. in Wuhe County.

[0045] (I) Test method

[0046] The oxygen transmission rate was tested at 23°C under 0% RH and 80% RH humidity according to GB / T 1038-2022; the water vapor transmission rate was tested according to GB / T 1037-2021, test conditions: 38°C, 90% RH; the tensile strength and elongation at break were tested according to GB / T 1040.1-2006, the tensile speed was 50 mm / min; the impact strength was tested according to GB / T 1843-2008.

[0047] (II) Preparation method

[0048] (1) Preparation of hydroxylated glass fiber

[0049] The glass fiber was immersed in a 10% hydrochloric acid solution, heated at 100°C for 8h, washed and dried to obtain the hydroxylated glass fiber.

[0050] (2) Preparation of polyhydroxy sulfonic acid quaternary ammonium salt

[0051] ① Preparation of 1# polyhydroxy sulfonic acid quaternary ammonium salt

[0052] S1, 3.92g (0.01mol) octadecyl trimethyl ammonium bromide was dissolved in 100ml ethanol, the bromide anion was exchanged into hydroxide anion by a hydroxide exchange column to form an octadecyl trimethyl ammonium hydroxide solution;

[0053] S2, 1.41g (0.01mol) 1,2-dihydroxyethanesulfonic acid (cas number: 115465-05-9, ) was added to the octadecyl trimethyl ammonium hydroxide solution, stirred for 10-15min, and the solvent was removed by vacuum baking to obtain 1# polyhydroxy sulfonic acid quaternary ammonium salt.

[0054] ② Preparation of 2# polyhydroxy sulfonic acid quaternary ammonium salt

[0055] S1, 4.62g (0.01mol) didodecyl dimethyl ammonium bromide was dissolved in 100ml isopropanol, the bromide anion was exchanged into hydroxide anion by a hydroxide exchange column to form a didodecyl dimethyl ammonium hydroxide solution;

[0056] S2, 2.13g (0.01mol) 2-(diethanolamino)ethanesulfonic acid (cas number: 10191-18-1, ) was added to the didodecyl dimethyl ammonium hydroxide solution, stirred for 10-15min, and the solvent was removed by vacuum baking to obtain 2# polyhydroxy sulfonic acid quaternary ammonium salt.

[0057] ③ Preparation of 3# polyhydroxy sulfonic acid quaternary ammonium salt

[0058] S1, 5.75 g (0.01 mol) of dicetyl dimethyl ammonium bromide was dissolved in 120 ml of isopropyl alcohol, and the bromide anion was exchanged into hydroxide anion by passing through a hydroxide exchange column to form a hydroxide solution of dicetyl dimethyl ammonium ion;

[0059] S2, 3.30 g (0.01 mol) of 3-[2-(4-hydroxybutoxy)-1-[(2-hydroxyethoxy) methyl] ethoxy]-1-propanesulfonic acid (cas No. 735251-18-0, ) was added to the hydroxide solution of dicetyl dimethyl ammonium ion, stirred for 10-15 min, and the solvent was removed by vacuum baking to obtain 3# polyhydroxy sulfonic acid quaternary ammonium salt.

[0060] (3) Preparation of water and oxygen barrier polyethylene composite material

[0061] Table 1: Raw material addition amount of water and oxygen barrier polyethylene composite material (unit: mass parts)

[0062]

[0063] 1) Preparation of Examples 1-4

[0064] S01, the montmorillonite was added to deionized water, stirred at 50-60℃ until the montmorillonite was fully dissolved, and then the quaternary ammonium polyhydroxy sulfonate was added for further heating and stirring, and the reaction was carried out for 3 hours;

[0065] S02, hydroxylated glass fiber was added, and the reaction was carried out for 3 hours at room temperature (25±2℃) with stirring;

[0066] S03, the product of step S02 was centrifuged, washed with deionized water, and dried to obtain an organic montmorillonite-glass fiber composite;

[0067] S04, polyethylene, ethylene-vinyl alcohol copolymer, organic montmorillonite-glass fiber composite of step S03 and auxiliary agent were blended, and the mixture was heated and melted at 180-230℃, then extruded and granulated to obtain the water and oxygen barrier polyethylene composite material.

[0068] 2) Preparation method of Comparative Example 1

[0069] The difference between Comparative Example 1 and Example 1 is that octadecyl trimethyl ammonium bromide is used instead of quaternary ammonium polyhydroxy sulfonate to prepare the polyethylene composite material.

[0070] S01, the montmorillonite was added to deionized water, stirred at 50-60℃ until the montmorillonite was fully dissolved, and then the quaternary ammonium polyhydroxy sulfonate was added for further heating and stirring, and the reaction was carried out for 3 hours;

[0071] S02, hydroxylated glass fiber was added, and the reaction was carried out for 3 hours at room temperature (25±2℃) with stirring;

[0072] S03, centrifuging, washing with deionized water, drying the product of step S02 to obtain an organic montmorillonite-glass fiber composite;

[0073] S04, blending polyethylene, ethylene-vinyl alcohol copolymer, the organic montmorillonite-glass fiber composite of step S03 and auxiliary agents, heating and melting mixing at 180-230°C, extruding and granulating to obtain a polyethylene composite material.

[0074] 3) Preparation method of Comparative Example 2

[0075] The difference between Comparative Example 2 and Example 4 is that no hydroxylated glass fiber is added. The preparation method is as follows:

[0076] S01, adding montmorillonite to deionized water, stirring at 50-60°C until the montmorillonite is fully dissolved, adding polyhydroxy quaternary ammonium sulfonate and continuing to heat and stir, reacting for 3 hours;

[0077] S02, centrifuging, washing with deionized water, drying the product of step S01 to obtain an organic montmorillonite;

[0078] S03, blending polyethylene, ethylene-vinyl alcohol copolymer, the organic montmorillonite of step S02 and auxiliary agents, heating and melting mixing at 180-230°C, extruding and granulating to obtain a polyethylene composite material.

[0079] 4) Preparation method of Comparative Example 3

[0080] The difference between Comparative Example 3 and Example 4 is that no montmorillonite is added. The preparation method is as follows:

[0081] S01, dissolving polyhydroxy quaternary ammonium sulfonate in deionized water, adding hydroxylated glass fiber, stirring at room temperature (25±2°C) for 3 hours;

[0082] S02, centrifuging, washing with deionized water, drying the product of step S01 to obtain modified glass fiber;

[0083] S03, blending polyethylene, ethylene-vinyl alcohol copolymer, the modified glass fiber of step S02 and auxiliary agents, heating and melting mixing at 180-230°C, extruding and granulating to obtain a polyethylene composite material.

[0084] 5) Preparation method of Comparative Example 4

[0085] The difference between Comparative Example 4 and Example 1 is that the amount of montmorillonite is increased from 8 parts by mass to 11 parts by mass.

[0086] 6) Preparation method of Comparative Example 5

[0087] The difference between Comparative Example 5 and Example 1 is that the glass fiber added in step S02 is not subjected to hydroxyl treatment.

[0088] S01, add montmorillonite into deionized water, stir at 50-60°C until the montmorillonite is fully dissolved, add polyhydroxy sulfonic acid quaternary ammonium salt and continue heating and stirring, and react for 3 hours;

[0089] S02, add glass fiber, stir at room temperature (25±2°C) for 3 hours;

[0090] S03, centrifuge the product of step S02, wash with deionized water, and dry to obtain an organic montmorillonite-glass fiber composite;

[0091] S04, blend polyethylene, ethylene-vinyl alcohol copolymer, the organic montmorillonite-glass fiber composite of step S03, and an auxiliary, heat and melt mix at 180-230°C, extrude and granulate to obtain the water and oxygen barrier polyethylene composite material.

[0092] Table 2: Performance test of the polyethylene composite material prepared in Examples 1-4 and Comparative Examples 1-5

[0093]

[0094]

[0095] As can be seen from Table 2, the polyethylene composite material in Examples 1-4 has excellent water and oxygen barrier properties, wherein the oxygen transmission rate under 0% RH conditions is less than 0.42 cm 3 / (m 2 ·24h·0.1MPa), the oxygen transmission rate under high humidity conditions is less than 0.9 cm 3 / (m 2 ·24h·0.1MPa), and the water vapor transmission rate is less than 0.8 g / (m 2 ·24h); in addition, its tensile properties and impact strength meet the use requirements.

[0096] As can be seen from Comparative Example 1 and Example 1, the water and oxygen barrier properties of the polyethylene composite material prepared by using octadecyl trimethyl ammonium bromide instead of polyhydroxy sulfonic acid quaternary ammonium salt are decreased, and the tensile strength and impact strength are also significantly reduced. This is because the interaction between the montmorillonite modified by octadecyl trimethyl ammonium bromide and the hydroxylated glass fiber is small, the montmorillonite-glass fiber composite is unstable, which leads to poor dispersion of the glass fiber in the system, and the barrier properties and mechanical properties are poor.

[0097] As can be seen from the comparative example 2 and the example 4, when the hydroxylated glass fiber is not added, the water and oxygen barrier properties of the composite material are obviously reduced, which is because the regularity of the distribution of the montmorillonite nanosheet is reduced, and the hydrogen bond effect between the hydroxyl glass fiber and the EVOH is not formed, and the compactness of the composite material is reduced; in addition, the tensile strength and the impact strength of the composite material are reduced without the reinforcing effect of the glass fiber.

[0098] As can be seen from the comparative example 3 and the example 4, when the montmorillonite is not added, the oxygen barrier property of the composite material is obviously deteriorated under high humidity conditions, and the water barrier property is reduced; and the impact strength of the composite material is also reduced without the toughening effect of the nanometer montmorillonite.

[0099] As can be seen from the comparative example 4 and the example 1, when the amount of the montmorillonite is continuously increased to 11 parts by mass, the barrier property and the mechanical property are deteriorated, which is because the agglomeration phenomenon occurs when the amount of the montmorillonite is large.

[0100] As can be seen from the comparative example 5 and the example 1, when the glass fiber is not subjected to the hydroxyl treatment, the water and oxygen barrier properties of the composite material are reduced, and the tensile strength and the impact strength are also obviously reduced. This is because the content of -OH on the surface of the glass fiber is low after the glass fiber is not subjected to the hydroxyl treatment, the interaction force between the modified montmorillonite and the glass fiber is small, and the compatibility of the glass fiber with the polyethylene is also poor, so that the dispersed phase in the system is unstable, and the barrier property and the mechanical property are deteriorated.

[0101] Obviously, the above examples of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the implementation modes are not required or can not be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A water- and oxygen-barrier polyethylene composite, characterized by, The water and oxygen barrier polyethylene composite comprises raw material components calculated by weight parts as follows: Polyethylene 80-95 parts Ethylene-vinyl alcohol copolymer 5-20 parts Hydroxylated glass fiber 2-10 parts Montmorillonite 2-8 parts Quaternary ammonium polyhydroxy sulfonate 0.5-4 parts Auxiliary agent 0.1-3 parts. The quaternary ammonium polyhydroxy sulfonate has a general structure as shown in formula (I): Formula (I) wherein the values of n1, n2, n3 and n4 of the alkyl chains on the quaternary ammonium cation are independently selected from 1 to 18, and are not simultaneously 1; the anion containing R in formula (I) is , or ; The preparation method of the water and oxygen barrier polyethylene composite comprises the following steps: S01, adding montmorillonite into deionized water, heating and stirring until the montmorillonite is fully dissolved, and then adding quaternary ammonium polyhydroxy sulfonate for further heating reaction; S02, adding hydroxylated glass fiber and stirring at room temperature for reaction; S03, centrifuging, washing and drying the product of step S02 to obtain an organic montmorillonite-glass fiber composite; S04, blending polyethylene, ethylene-vinyl alcohol copolymer, the organic montmorillonite-glass fiber composite of step S03 and auxiliary agent, heating and melting mixing, extruding and granulating to obtain the water and oxygen barrier polyethylene composite.

2. The water and oxygen barrier polyethylene composite of claim 1, wherein, The hydroxylated glass fiber is obtained by heating and reacting glass fiber in strong acid.

3. The water and oxygen barrier polyethylene composite of claim 1, wherein The preparation method of the quaternary ammonium polyhydroxy sulfonate comprises the following steps: S1, dissolving halide salt of quaternary ammonium compound in solvent, exchanging halide anion into hydroxide anion through hydroxide exchange column to form quaternary ammonium cation-containing hydroxide; S2, adding polyhydroxy sulfonic acid in equimolar amount with the quaternary ammonium cation-containing hydroxide, stirring for neutralization reaction, and vacuum baking to remove solvent to obtain the quaternary ammonium polyhydroxy sulfonate.

4. The water and oxygen barrier polyethylene composite of claim 3, wherein, The quaternary ammonium cation is a mixture of one or more of dodecyltrimethylammonium ion, tetradecyltrimethylammonium ion, hexadecyltrimethylammonium ion, octadecyltrimethylammonium ion, dioctyl dimethyl ammonium ion, didecyl dimethyl ammonium ion, didodecyl dimethyl ammonium ion, ditetradecyl dimethyl ammonium ion, dihexadecyl dimethyl ammonium ion, dioctadecyl dimethyl ammonium ion.

5. The water and oxygen barrier polyethylene composite of claim 3, wherein the polyethylene is a high density polyethylene. The polyhydroxy sulfonic acid is a mixture of one or more of 1,2-dihydroxyethanesulfonic acid, 2-(diethanolamino)ethanesulfonic acid, 3-[2-(4-hydroxybutoxy)-1-[(2-hydroxyethoxy)methyl]ethoxy]-1-propanesulfonic acid.

6. The water and oxygen barrier polyethylene composite of claim 1, wherein, The auxiliary agent comprises a mixture of one or more of antioxidant, antistatic agent, compatibilizer and toughening agent.

7. The water and oxygen barrier polyethylene composite of claim 1, wherein, The heating temperature in step S01 is 50-60℃, the room temperature in step S02 is 10-40℃, and the heating temperature in step S04 is 180-230℃.

8. The water and oxygen barrier polyethylene composite of claim 1, wherein, The heating reaction time in step S01 is 2-4h, and the stirring reaction time in step S02 is 2-4h.

Images