Olefin polymer composition and application thereof

Abstract

The invention provides an olefin polymer composition and application thereof, and relates to the technical field of composite materials. The olefin polymer composition is prepared from the following raw material components in parts by weight: 100 parts of an olefin polymer, 0.5 to 5 parts of an anthraquinone compound and 1 to 5 parts of aspartic ester resin, the structure of the aspartic ester resin contains C8-C24 alkylene and a polyethylene glycol chain segment. The olefin polymer composition has good hydrophilicity, and the treatment effect of the olefin polymer composition on nitrogen-containing sewage can be improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of composite materials, and relates to an olefin polymer composition and application thereof. BACKGROUND

[0002] Anthraquinone compounds as redox mediators for the treatment of nitrogen-containing wastewater (such as nitrate-containing wastewater) show good application prospects. Loading anthraquinone compounds on a carrier can provide relatively long-lasting effects and avoid "secondary pollution" caused by anthraquinone compounds. Olefin polymers have good chemical stability, mechanical strength, suitable density, low price, good processing performance and other characteristics, and are suitable as carriers for anthraquinone compounds. However, the strong hydrophobicity of olefin polymers makes it difficult for microorganisms to adhere, which affects the effect of anthraquinone compounds. Chinese patents CN110204056A, CN110157031A and the like disclose methods for grafting anthraquinone compounds on the surface of plastics, which require first performing surface hydrophilic treatment on the hydrophobic plastics, and then grafting anthraquinone compounds on the surface of the plastics through chemical reaction. It has been proven that the above-mentioned methods have the following disadvantages: (1) high cost, complex operation, and not conducive to processing into fillers, affecting actual application; (2) the stability of the surface-grafted anthraquinone compounds in the wastewater environment will deteriorate, causing the fillers to gradually lose effectiveness; (3) the surface of the plastic loaded with anthraquinone compounds is hydrophobic, which is not conducive to the adsorption of microorganisms on the fillers. Chinese patent CN110204056A also adopts a method of grafting on the surface of the carrier, but further grafts polyethylene glycol to improve the surface hydrophilicity of the carrier. However, the above-mentioned disadvantages (1) and (2) still exist.

[0003] Therefore, the applicant believes that the above-mentioned methods of loading anthraquinone compounds on a carrier need to be improved. SUMMARY

[0004] In order to solve the above-mentioned technical problems and obtain a supported anthraquinone composition with good hydrophilicity, stability and long-term performance, the present application provides an olefin polymer composition and application thereof.

[0005] The technical scheme of the present application is as follows:

[0006] An olefin polymer composition, the raw material components of which comprise, by weight fraction, 100 parts of an olefin polymer, 0.5-5 parts of an anthraquinone compound and 1-5 parts of an aspartic acid ester resin.

[0007] The structure of the aspartic acid ester resin contains C8-C24 alkylene and polyethylene glycol segments.

[0008] Preferably, the structure of the aspartic acid ester resin is as shown in the following formula (1),

[0009]

[0010] wherein X is a C8-C24 alkylene group, and at least one of R1and R2is the polyethylene glycol segment.

[0011] More preferably, both R1and R2are the polyethylene glycol segment.

[0012] Or, R1is the polyethylene glycol segment, and R2is selected from a C1-C4 alkyl group.

[0013] More preferably, the aspartate resin is chain-extended with a diisocyanate monomer.

[0014] The molar ratio of the aspartate resin to the diisocyanate monomer is 2-1.1:1.

[0015] Further preferably, the diisocyanate monomer is selected from one or a combination of two or more of MDI, HMDI, IPDI, NDI, CHDI, XDI, PPDI, and TDI.

[0016] Preferably, the olefin polymer is selected from a homopolymer of one or a copolymer of two or more of ethylene, propylene, 1-butene, 1-hexene, 1-octene, and 1-pentene.

[0017] Preferably, the anthraquinone compound is selected from one or a combination of two or more of anthraquinone, 1,5-dichloroanthraquinone, 1,8-dichloroanthraquinone, 1,4,5,8-tetrachloroanthraquinone, 2-ethylanthraquinone, 2-aminoanthraquinone, 1-aminoanthraquinone, 1-amino-2-bromo-4-hydroxyanthraquinone, 1,2-diaminoanthraquinone, 1,4-diaminoanthraquinone, 2,6-diaminoanthraquinone, 1,8-diaminoanthraquinone, 1,5-diaminoanthraquinone, 1-amino-2-methylanthraquinone, 1,5-dihydroxy-4,8-diaminoanthraquinone, 1-hydroxyanthraquinone, 2-hydroxyanthraquinone, 1-hydroxy-3-methylanthraquinone, 2-hydroxymethylanthraquinone, 1,4-dihydroxyanthraquinone, 1,8-dihydroxyanthraquinone, 1,6-dihydroxyanthraquinone, 1-methylanthraquinone, 2-methylanthraquinone, 1,2-dimethylanthraquinone, 1,4-dimethylanthraquinone, 1,8-dimethylanthraquinone, 2,6-dimethylanthraquinone, and 1,5-dimethylanthraquinone.

[0018] Preferably, the feedstock component further comprises 0.1-2 parts of a carbon-based material.

[0019] The carbon-based material is selected from one or a combination of two or more of carbon nanotubes, graphene, carbon nanobulb, and fullerene.

[0020] Preferably, the surface of the carbon-based material is treated with a surface treatment agent.

[0021] Preferably, the surface treatment agent is selected from an epoxy silane coupling agent or an amino-containing silane coupling agent.

[0022] Use of the olefin polymer composition according to any one of the preceding embodiments for the treatment of nitrogen-containing wastewater.

[0023] The present application has the following advantages:

[0024] (1) The present application adds a hydrophilic aspartic acid ester resin into the olefin polymer, the aspartic acid ester resin contains C8-C24 alkylene, which can improve the compatibility of the aspartic acid ester resin and the olefin polymer; the hydrophilic polyethylene glycol segment in the aspartic acid ester resin can improve the hydrophilicity of the olefin polymer, which is more conducive to the adsorption of microorganisms and improves the denitrification effect.

[0025] (2) The aspartic acid ester resin is further chain-extended by a diisocyanate monomer, which has the following effects: (1) a higher molecular weight aspartic acid ester resin is obtained, which is conducive to improving the stability of the aspartic acid ester resin in the olefin polymer composition and improving the stability and long-term performance of the hydrophilicity; (2) when the anthraquinone compound contains an epoxy group or an NCO group, the anthraquinone compound can react with the chain-extended aspartic acid ester resin to fix part or all of the anthraquinone compound with the aspartic acid ester resin, thereby improving the stability and long-term performance of the denitrification performance of the olefin polymer composition.

[0026] (3) The carbon-based material is further added to the olefin polymer composition, and the carbon-based material with good electrical conductivity can improve the redox mediator effect of the anthraquinone compound and has a good promoting effect on denitrification. When the surface treatment agent of the carbon-based material contains an epoxy group or an amino group, it can react with the anthraquinone compound and / or the chain-extended aspartic acid ester resin, thereby further improving the stability and long-term performance of the denitrification performance of the olefin polymer composition.

[0027] (4) The olefin polymer composition of the present application can be processed into a filler in a flexible and convenient manner, for example, it can be extruded into a shape by using a screw extruder. DETAILED DESCRIPTION

[0028] The technical solutions of the present application are further described and explained below through specific embodiments.

[0029] In one aspect, the present application provides an olefin polymer composition, which is composed of 100 parts of an olefin polymer, 0.5-5 parts of an anthraquinone compound, and 1-5 parts of an aspartic acid ester resin, by weight.

[0030] The aspartic acid ester resin contains C8-C24 alkylene and a polyethylene glycol segment in its structure.

[0031] The anthraquinone compound in the olefin polymer composition serves as a redox mediator to remove nitrogen from the nitrogen-containing wastewater. The aspartic acid ester resin contains C8-C24 alkylene, which can improve the compatibility of the aspartic acid ester resin with the olefin polymer, avoid the agglomeration or poor dispersion of the aspartic acid ester resin due to incompatibility, and affect the effect. The polyethylene glycol segment is incompatible with the olefin polymer, and can migrate or distribute on the surface of the olefin polymer, thereby improving the hydrophilicity of the olefin polymer. Therefore, the aspartic acid ester resin of the present application is partially compatible with the olefin polymer, and can improve the hydrophilicity of the olefin polymer. The olefin polymer composition of the present application has good processability, and can be prepared into various structures by melt extrusion molding method and applied, such as used in moving bed biofilm reactor (MBBR) system, constructed into electron transfer enhanced biofilm reactor system, and achieved the effect of removing nitrogen from the nitrogen-containing wastewater.

[0032] The weight fraction of the anthraquinone compound in the olefin polymer composition can be any value in 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc. Further, the weight fraction of the anthraquinone compound can be 0.5-3 parts. The weight fraction of the aspartic acid ester resin in the olefin polymer composition can be any value in 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc. For the same aspartic acid ester resin, the higher the weight fraction, the better the hydrophilicity of the olefin polymer composition, but if the weight fraction of the aspartic acid ester resin is too high, it will produce obvious incompatibility, which is not conducive to the hydrophilicity of the olefin polymer composition.

[0033] In some embodiments, the structure of the aspartic acid ester resin is as shown in the following formula (1),

[0034]

[0035] wherein X is C8-C24 alkylene, and at least one of R1 and R2 is selected from a polyethylene glycol segment. In the present application, the aspartic acid ester resin of formula (1) can be obtained by Michael addition reaction of corresponding diamine X(NH2)2 and maleate (or fumarate) followed by ester exchange reaction with polyethylene glycol monoalkyl ether, which is well known to those skilled in the art. The diamine X(NH2)2 can be 1,8-octanediamine, 1,12-dodecanediamine, 1,18-octadecanediamine, etc. For the structure of the polyethylene glycol segment, it can be as shown in the following formula (2),

[0036] -(CH2CH2O) m R3(2)

[0037] wherein m is greater than or equal to 3, and R3 is selected from C1-C4 alkyl groups. Or further, m is from 3 to 50.

[0038] In some embodiments, R1 and R2 are both polyethylene glycol segments.

[0039] Or, R1 is a polyethylene glycol segment, and R2 is selected from C1-C4 alkyl groups.

[0040] When R1 and R2 are both polyethylene glycol segments, the aspartic acid ester resin has relatively better hydrophilicity due to the presence of two polyethylene glycol segments in the molecular structure. When R1 is a polyethylene glycol segment, R2 can be methyl, ethyl, and the like.

[0041] In some embodiments, the aspartic acid ester resin is chain-extended with a diisocyanate monomer.

[0042] The molar ratio of the aspartic acid ester resin to the diisocyanate monomer is from 2 to 1.1:1.

[0043] Chain-extending the aspartic acid ester resin with a diisocyanate monomer can increase the molecular weight of the aspartic acid ester resin. The aspartic acid ester resin with a larger molecular weight has better stability and persistence in the olefin polymer composition, and can provide stable and persistent hydrophilicity to the olefin polymer composition. For the molar ratio of the aspartic acid ester resin to the diisocyanate monomer, by way of example, it can be any value from 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, and the like, and the chain-extended aspartic acid ester resin structure also contains a secondary amine group.

[0044] Further, the diisocyanate monomer is selected from one or a combination of two or more of diphenylmethane diisocyanate MDI, dicyclohexylmethane diisocyanate HMDI, isophorone diisocyanate IPDI, 1,5-naphthalene diisocyanate NDI, cyclohexane-1,4-diisocyanate CHDI, m-xylylene diisocyanate XDI, p-phenylene diisocyanate PPDI, and toluene diisocyanate TDI.

[0045] In some embodiments, the olefin polymer is selected from a homopolymer of one of ethylene, propylene, 1-butene, 1-hexene, 1-octene, and 1-pentene or a copolymer of two or more thereof. Further, the olefin polymer can be HDPE, which has the characteristics of high mechanical strength, good chemical stability, low density, low cost, easy processing, etc. Of course, the olefin polymer can also be polypropylene, POE elastomer, etc. For the filler made of the olefin polymer composition, the density is preferably close to that of the nitrogen-containing wastewater to be treated, so that the filler can be suspended in the nitrogen-containing wastewater to better achieve the effect. If the density of the olefin polymer composition is significantly higher than that of the nitrogen-containing wastewater, a proper amount of foaming agent can be added to the olefin polymer composition to adjust its density, or a small amount of filler rich in pores (such as zeolite, silica aerogel, mesoporous silica, etc.) can be added to reduce its density. Further, for HDPE, the melt index (2.16 Kg, 190°C) is not particularly limited and can be 0.5-20 g / min.

[0046] In some embodiments, the anthraquinone compound is selected from one or a combination of two or more of anthraquinone, 1,5-dichloroanthraquinone, 1,8-dichloroanthraquinone, 1,4,5,8-tetrachloroanthraquinone, 2-ethylanthraquinone, 2-aminoanthraquinone, 1-aminoanthraquinone, 1-amino-2-bromo-4-hydroxyanthraquinone, 1,2-diaminoanthraquinone, 1,4-diaminoanthraquinone, 2,6-diaminoanthraquinone, 1,8-diaminoanthraquinone, 1,5-diaminoanthraquinone, 1-amino-2-methylanthraquinone, 1,5-dihydroxy-4,8-diaminoanthraquinone, 1-hydroxyanthraquinone, 2-hydroxyanthraquinone, 1-hydroxy-3-methylanthraquinone, 2-hydroxymethylanthraquinone, 1,4-dihydroxyanthraquinone, 1,8-dihydroxyanthraquinone, 1,6-dihydroxyanthraquinone, 1-methylanthraquinone, 2-methylanthraquinone, 1,2-dimethylanthraquinone, 1,4-dimethylanthraquinone, 1,8-dimethylanthraquinone, 2,6-dimethylanthraquinone, and 1,5-dimethylanthraquinone.

[0047] In some embodiments, the raw material component further comprises 0.1-2 parts of a carbon-based material.

[0048] The carbon-based material is selected from one or a combination of two or more of carbon nanotubes, graphene, carbon nanonions, and fullerenes.

[0049] The carbon-based material has good electrical conductivity, which can further improve the performance of the redox mediator, i.e., the anthraquinone compound, and improve the nitrogen removal efficiency of the olefin polymer composition. For example, the weight fraction of the carbon-based material can be any value in 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, 1.2 part, 1.3 part, 1.5 part, etc. Further, the weight fraction of the carbon-based material in the raw material component is 0.1-0.5 part.

[0050] In some embodiments, the carbon-based material surface is treated with a surface treatment agent; the carbon-based material surface is treated with a surface treatment agent, the surface treatment agent is an organic surface treatment agent, which can graft an organic structure on the carbon-based material surface, improving the compatibility of the carbon-based material with the olefin polymer or forming stronger interactions (such as forming hydrogen bonds, chemical reactions, etc.) with the anthraquinone compound and / or the aspartic acid ester resin.

[0051] Further, the surface treatment agent is selected from an epoxy silane coupling agent or an amino-containing silane coupling agent. For the epoxy silane coupling agent, examples can be KH-560, KH-1770, KH-1771, etc. For the amino-containing silane coupling agent, examples can be KH-550, KH-792, KH-602, etc. When the surface treatment agent is an epoxy silane coupling agent, the carbon-based material surface is grafted with an epoxy group, which can react with the amino-containing anthraquinone compound (or the hydroxyl-containing anthraquinone compound) and the aspartic acid ester resin during melt processing of the olefin polymer composition, and the anthraquinone compound and / or the aspartic acid ester resin are combined with the carbon-based material, further improving the performance of the olefin polymer composition, such as improving the denitrification efficiency, and making the denitrification effect more stable and persistent, etc.

[0052] On the other hand, the present application also proposes an application of the olefin polymer composition according to any one of the above embodiments, which is applied to the treatment of nitrogen-containing wastewater. The nitrogen-containing wastewater can be wastewater containing nitrate, organic nitrogen, nitrite, etc. The olefin polymer composition can be processed into fillers of different structures, which are more beneficial to use. The fillers can refer to CJ / T 461-2014 "High-density polyethylene suspended carrier filler for water treatment".

[0053] The technical solutions of the present application are further described and explained according to various embodiments below. Unless otherwise specified, the amounts in the following embodiments are parts by weight.

[0054] Preparation of hydrophilic aspartic acid ester resin in Preparation Example 1-3

[0055] Preparation Example 1

[0056] The molar ratio of 1,18-octadecanediamine, diethyl maleate and MPEG-800 is 1:2:2.

[0057] 1,18-octadecanediamine was added to a reaction vessel, and diethyl maleate was added dropwise under stirring while the temperature was raised to 95°C. The reaction temperature was controlled not to exceed 100°C. After the dropwise addition was completed, the temperature was raised to 100-105°C, and the reaction was carried out for 120 h. 1% by weight of tetraethyl titanate and MPEG-800 were added to the reaction system, and the pressure was adjusted to -(0.05±0.01) MPa. The reaction was carried out until no low-boiling substances were discharged, and then the temperature was lowered to obtain the hydrophilic aspartic acid ester resin.

[0058] Preparation Example 2

[0059] The difference between this preparation example and Preparation Example 1 is that the molar ratio of 1,18-octadecanedi-amine, diethyl maleate and MPEG-800 in Preparation Example 1 is adjusted from 1:2:2 to 1:2:1. The remaining steps remain unchanged.

[0060] Preparation Example 3

[0061] The molar ratio of 1,8-octane diamine, diethyl maleate and MPEG-1500 (1500 represents the number average molecular weight of MPEG) is 1:2:2.

[0062] 1,8-octane diamine is added to a reaction vessel, and diethyl maleate is added dropwise under stirring while the temperature is raised to 55°C, with the reaction temperature controlled to not exceed 70°C. After the dropwise addition is completed, the temperature is raised to 80-85°C, and the reaction is carried out for 120 hours, to obtain a hydrophobic aspartate resin. Tetraethyl titanate and MPEG-1500 in an amount of 1% by weight of the MPEG-1500 are added to the reaction vessel, the temperature is raised to 120°C, the pressure of the reaction system is adjusted to -(0.05±0.01) MPa, and the reaction is carried out until no low-boiling substances are released, and then the temperature is lowered, to obtain a hydrophilic aspartate resin.

[0063] Example 1

[0064] The raw material components of the olefin polymer composition of this example are composed of 100 parts of HDPE (melt index 5 g / min), 1 part of 1-methylanthraquinone and 1 part of the hydrophilic aspartate resin of Preparation Example 1.

[0065] The HDPE, 1-methylanthraquinone and hydrophilic aspartate resin are dried in advance to remove water, and then mixed and added to a twin-screw extruder to be melt-extruded into a filler. The temperature of the melt section is 180-190°C, and the temperature of the extrusion die is 180°C.

[0066] Example 2

[0067] The difference between this example and Example 1 is that the hydrophilic aspartate resin of Preparation Example 1 in Example 1 is adjusted from 1 part to 5 parts. The remaining steps remain unchanged.

[0068] Comparative Example 1

[0069] The difference between this comparative example and Example 2 is that the hydrophilic aspartate resin in Example 2 is replaced with an equal weight part of the hydrophobic aspartate resin in Preparation Example 1. The remaining steps remain unchanged.

[0070] Comparative Example 2

[0071] The difference between this comparative example and Example 2 is that the hydrophilic aspartic acid ester resin of Preparation Example 1 in Example 2 is replaced by the hydrophilic aspartic acid ester resin of Preparation Example 2 in equal weight fraction. The remaining steps remain unchanged.

[0072] The above hydrophilic aspartic acid ester resin is prepared according to the method of steps (1) and (2) in Example 1 of Chinese patent CN111303368A, with the difference that the triethylene glycol monomethyl ether is replaced by 2 mol MPEG-1500.

[0073] Example 3

[0074] The difference between this example and Example 2 is that the hydrophilic aspartic acid ester resin of Preparation Example 1 in Example 2 is replaced by the hydrophilic aspartic acid ester resin of Preparation Example 3 in equal weight fraction. The remaining steps remain unchanged.

[0075] Example 4

[0076] The difference between this example and Example 2 is that the hydrophilic aspartic acid ester resin of Preparation Example 1 in Example 2 is replaced by the hydrophilic aspartic acid ester resin of Preparation Example 3 in equal weight fraction. The remaining steps remain unchanged.

[0077] Example 5

[0078] The difference between this example and Example 2 is that the hydrophilic aspartic acid ester resin of Preparation Example 1 in Example 2 is replaced by the hydrophilic aspartic acid ester resin of Preparation Example 3 in equal weight fraction. The remaining steps remain unchanged.

[0079] The preparation method of the chain-extended hydrophilic aspartic acid ester resin is as follows: the hydrophilic aspartic acid ester resin of Preparation Example 1 and HMDI are added to a reaction container in a molar ratio of 2:1, stirred at room temperature for 2 h, and then heated to 80°C for continuous stirring until no NCO group is detected, to obtain the chain-extended hydrophilic aspartic acid ester resin.

[0080] Example 6

[0081] The difference between this example and Example 5 is that the molar ratio of the hydrophilic aspartic acid ester resin and HMDI is adjusted from 2:1 to 1.2:1 when preparing the chain-extended hydrophilic aspartic acid ester resin in Example 5. The remaining steps remain unchanged.

[0082] Example 7

[0083] The raw material components of the olefin polymer composition of this example are composed of 100 parts of HDPE (melt index 10 g / min), 2 parts of 2-aminoanthraquinone, and 3 parts of the hydrophilic aspartic acid ester resin of Preparation Example 1.

[0084] According to the method of Example 1, a filler is prepared.

[0085] Example 8

[0086] The difference between this embodiment and embodiment 7 is that the raw material combination in embodiment 7 further comprises 0.2 parts of graphene. The remaining steps remain unchanged.

[0087] The graphene is graphene oxide obtained by Hummers method and reduced by vitamin C.

[0088] Embodiment 9

[0089] The difference between this embodiment and embodiment 7 is that the surface of graphene in embodiment 7 is modified by epoxy group. The remaining steps remain unchanged.

[0090] The method for modifying the surface of graphene with epoxy group is as follows: 1 part of graphene oxide obtained by Hummers method is dispersed in 90% volume concentration ethanol to prepare a concentration of 1 mg / ml, 1 part of KH-560 is added, stirred at room temperature for 2 h, then warmed to micro-reflux, continue to react for 2 h, then add 5 parts of vitamin C, continue to react under micro-reflux for 8 h, centrifuge to collect the solid, wash the solid with anhydrous ethanol for 2 times, dry at 60°C overnight, and obtain the product.

[0091] Performance test

[0092] 1. Hydrophilicity: tested by water contact angle tester. The olefin polymer compositions of embodiments 1-9 and comparative examples 1-2 are respectively prepared into thin plates with a size of 20 cm x 20 cm x 2 mm, and the water contact angle is tested at four corners and the middle of the same surface of the thin plates, and the average value of the five results is taken, as shown in Table 1 below.

[0093] Table 1 Water contact angle test results

[0094]

[0095] Comparing the data in Table 1 above, it can be seen that the surface hydrophilicity of comparative example 2 is obviously uneven, resulting in a larger average water contact angle and higher unevenness.

[0096] 2. Denitrification performance test: 500 ml of denitrification medium with an initial concentration of 50 mg / L (initial concentration of nitrate is 50 mg / L) is prepared, inoculated with 3% of microorganisms activated and cultured in LB medium, and the inoculated denitrification medium is placed in a constant temperature shaker, set at a temperature of 36°C and a speed of 120 r / min, so that 10 g of the filler to be tested in the medium is in a good fluidized state. Sample every 5 h, centrifuge the sample at 3000 rpm for 10 min, take the supernatant of the sample for quantitative dilution, measure the absorbance by ultraviolet spectrophotometer to calculate the corresponding concentration, and calculate the denitrification rate. The denitrification rate at time t = (C0-C t) / C0 x 100%, wherein C0 is the concentration of nitrate at the initial time, C t is the concentration of nitrate at time t. Each sample to be tested is measured three times, and the three results are averaged.

[0097] The results are shown in Table 2 below, wherein the blank group is without the addition of the filler or the anthraquinone compound.

[0098] Table 2 Denitrification rate / %

[0099]

[0100]

[0101] Therefore, from the data results of Table 2 above, it can be seen that the filler prepared from the olefin polymer composition of the present application can significantly improve the denitrification efficiency due to better hydrophilicity. It is found that the filler obtained in Comparative Example 2 has individual parts falling off in the test. In combination with the results of Table 1 above, the possible reason is that the water-soluble polyaspartate resin has poor compatibility with HDPE, resulting in the agglomeration of the water-soluble polyaspartate resin in the olefin polymer composition. Since the water-soluble polyaspartate resin has good hydrophilicity, the water-soluble polyaspartate resin agglomerated on the surface of the filler can be dissolved in the culture medium, resulting in changes in the surface properties of the filler and affecting the denitrification performance.

[0102] 3. Filler stability: The filler to be tested is soaked in water for 72 h, and after being taken out, it is air-dried at room temperature for 24 h, and then tested according to the above denitrification performance test. The denitrification rate retention rate at 15 h of denitrification is tested. Denitrification rate retention rate = denitrification rate after soaking / denitrification rate before soaking x 100%. The higher the denitrification rate retention rate, the better the stability of the denitrification performance of the filler.

[0103] The results are shown in Table 3 below.

[0104] Table 3 Denitrification rate retention rate / %

[0105] Example 2 Example 5 Example 6 Example 7 Example 8 Example 9 80.7 88.3 92.2 82.4 85.0 95.7

[0106] From the data of Table 3 above, it can be seen that the aspartate resin after chain extension is more conducive to the stability of the denitrification performance; the anthraquinone compound, graphene and hydrophilic aspartate resin after chemical reaction are more conducive to the stability of the denitrification performance of the filler.

[0107] The basic principles, main features and advantages of the present application have been shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-described embodiments, which are merely preferred embodiments of the present application, and the scope of the present application is not limited by the above-described embodiments. Equivalent changes and modifications made in accordance with the scope of the present application and the content of the specification should still be within the scope of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An olefin polymer composition, characterized by, The raw material component comprises 100 parts of an olefin polymer, 0.5-5 parts of an anthraquinone compound and 1-5 parts of an aspartic acid ester resin by weight; The aspartic acid ester resin contains C8-C24 alkylene and polyethylene glycol chain segments in its structure.

2. The olefin polymer composition according to claim 1, characterized in that, The structure of the aspartic acid ester resin is shown in the following formula (1), wherein X is C8-C24 alkylene, and at least one of R1 and R2 is selected from the polyethylene glycol chain segment.

3. The olefin polymer composition according to claim 2, characterized in that, Both R1 and R2 are the polyethylene glycol chain segment; or, R1 is the polyethylene glycol chain segment, and R2 is selected from C1-C4 alkyl.

4. The olefin polymer composition according to claim 2, characterized in that, The aspartic acid ester resin is chain-extended by a diisocyanate monomer; The molar ratio of the aspartic acid ester resin to the diisocyanate monomer is 2-1.1:

1.

5. The olefin polymer composition according to claim 4, characterized in that, The diisocyanate monomer is selected from one or a combination of two or more of MDI, HMDI, IPDI, NDI, CHDI, XDI, PPDI and TDI.

6. The olefin polymer composition according to claim 1, characterized in that, The olefin polymer is selected from a homopolymer of one of ethylene, propylene, 1-butene, 1-hexene, 1-octene and 1-pentene or a copolymer of two or more thereof.

7. The olefin polymer composition according to claim 1, characterized in that, The anthraquinone compound is selected from one or a combination of two or more of anthraquinone, 1,5-dichloroanthraquinone, 1,8-dichloroanthraquinone, 1,4,5,8-tetrachloroanthraquinone, 2-ethylanthraquinone, 2-aminoanthraquinone, 1-aminoanthraquinone, 1-amino-2-bromo-4-hydroxyanthraquinone, 1,2-diaminoanthraquinone, 1,4-diaminoanthraquinone, 2,6-diaminoanthraquinone, 1,8-diaminoanthraquinone, 1,5-diaminoanthraquinone, 1-amino-2-methylanthraquinone, 1,5-dihydroxy-4,8-diaminoanthraquinone, 1-hydroxyanthraquinone, 2-hydroxyanthraquinone, 1-hydroxy-3-methylanthraquinone, 2-hydroxymethylanthraquinone, 1,4-dihydroxyanthraquinone, 1,8-dihydroxyanthraquinone, 1,6-dihydroxyanthraquinone, 1-methylanthraquinone, 2-methylanthraquinone, 1,2-dimethylanthraquinone, 1,4-dimethylanthraquinone, 1,8-dimethylanthraquinone, 2,6-dimethylanthraquinone and 1,5-dimethylanthraquinone.

8. The olefin polymer composition according to claim 1, characterized in that, The raw material component further comprises 0.1-2 parts of a carbon-based material; The carbon-based material is selected from one or a combination of two or more of carbon nanotube, graphene, carbon nanonion and fullerene.

9. The olefin polymer composition according to claim 1, characterized in that, The surface of the carbon-based material is treated by a surface treatment agent; Preferably, the surface treatment agent is selected from an epoxy silane coupling agent or an amino-containing silane coupling agent.

10. Use of the olefin polymer composition according to any one of claims 1 to 9, characterized in that, Applied to the treatment of nitrogen-containing sewage.

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