Reinforced polyethylene square drainage pipe and production method thereof

Abstract

The invention relates to the technical field of high polymer materials, and discloses a reinforced polyethylene square drainage pipe material and a production method of the reinforced polyethylene square drainage pipe material. Comprising the following raw materials: high-density polyethylene, maleic anhydride grafted polyethylene, a reinforcing antibacterial filler, naphthalene modified butyl rubber, a flame retardant, an antioxidant, an ultraviolet light absorber, a lubricant and a plasticizer. The reinforced antibacterial filler and the naphthalene modified butyl rubber participate in the preparation process of the polyethylene square drainage pipe material, so that the prepared polyethylene square drainage pipe material can have excellent tensile strength, impact resistance and wear resistance, and meanwhile, the polyethylene square drainage pipe material is endowed with an excellent antibacterial effect; the use field of the polyethylene square drainage pipe is greatly expanded, and the service life of the polyethylene square drainage pipe is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly relates to a reinforced polyethylene square drainage pipe and a production method thereof. Background Art

[0002] Due to its excellent light weight characteristics and processing convenience, polyethylene materials have been widely used in the field of drainage pipes. However, with the rapid development of modern facility construction and the diversification of application scenarios, the mechanical strength and impact resistance of traditional polyethylene drainage pipes are average, and it has been difficult to meet the long-term use requirements under complex working conditions. Especially when frequently subjected to external loads and other stress actions, traditional polyethylene drainage pipes are prone to generate microcracks due to stress concentration. During long-term use, the cracks expand, eventually leading to phenomena such as leakage and rupture of the pipe body, which not only shortens the service life of the pipe, but also increases the maintenance cost and potential safety hazards. In addition, the functionality of traditional polyethylene pipes is relatively single, especially lacking the active defense ability against microbial erosion. In the drainage system, the pipes are in long-term contact with environments rich in microorganisms such as sewage, and bacteria and other microorganisms are extremely likely to adhere to the pipe wall surface to form biofilms, which will exacerbate the corrosion of the pipeline, resulting in a decline in the mechanical properties of the pipe, and is also prone to cause problems such as pipeline blockage and secondary water pollution.

[0003] The patent with the publication number CN116285054B discloses a polyethylene pipe for water supply and a preparation method thereof. The polyethylene pipe for water supply includes the following raw materials: polyethylene, carbon black masterbatch, antioxidant, flame retardant, and polypropylene. By adding a small amount of polypropylene to the polyethylene raw material and then pre-mixing at low temperature, the impact strength of the prepared polyethylene pipe can be significantly improved. However, the pipe prepared by this patent lacks antibacterial effect. During long-term use, the attachment of microorganisms will affect the service life of the pipe, and there is also a risk of water quality pollution. Summary of the Invention

[0004] The purpose of the present invention is to provide a reinforced polyethylene square drainage pipe and a production method thereof, which solve the following technical problems: (1) The tensile strength and impact resistance of traditional polyethylene drainage pipes are average, and cracks will occur during long-term use, resulting in damage problems; (2) Traditional polyethylene drainage pipes have no antibacterial ability, and the physiological activities of bacteria exacerbate pipeline corrosion, resulting in a decline in mechanical properties.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A reinforced polyethylene square drainage pipe comprises the following raw materials in parts by weight: high-density polyethylene, maleic anhydride grafted polyethylene, reinforced antibacterial filler, naphthalene-modified butyl rubber, flame retardant, antioxidant, ultraviolet absorber, lubricant, and plasticizer; the reinforced antibacterial filler is prepared by reacting modified pyrophyllite with ursolic acid under the action of a catalyst; the modified pyrophyllite is prepared by surface-modifying pyrophyllite with isocyanatepropyltriethoxysilane; the naphthalene-modified butyl rubber is prepared by reacting epoxidized butyl rubber with 2-naphthylamine; and the epoxidized butyl rubber is prepared by epoxidizing butyl rubber under the action of formic acid and hydrogen peroxide.

[0007] Furthermore, the flame retardant is any one of triphenylphosphine, flame retardant DOPO, and di-tert-butyl chloromethyl phosphate; the antioxidant is any one of antioxidant 168, antioxidant 1098, and antioxidant 1135; the ultraviolet absorber is any one of ultraviolet absorber UV-3030, ultraviolet absorber UV-326, and ultraviolet absorber UV-P; the lubricant is any one of stearic acid, zinc stearate, and white oil; the plasticizer is any one of dioctyl phthalate, diisononyl phthalate, and castor oil.

[0008] Furthermore, the preparation method of the reinforced antibacterial filler comprises the following steps:

[0009] S1: placing pyrophyllite in anhydrous ethanol, stirring magnetically for 10-15 minutes at room temperature, ultrasonically dispersing for 3-5 minutes, adding isocyanatepropyltriethoxysilane, stirring and mixing thoroughly, adjusting the pH with acetic acid solution, heating to 45-50°C and stirring for 5-6 hours, then filtering, washing, and vacuum drying to obtain modified pyrophyllite;

[0010] S2: Place the modified pyrophyllite in toluene, ultrasonically disperse for 15-20 minutes, add ursolic acid and a catalyst, mix thoroughly, heat to 75-80°C, stir and react for 8-10 hours, centrifuge, wash and vacuum dry after the reaction to obtain a reinforced antibacterial filler.

[0011] Furthermore, in step S1, the mass ratio of pyrophyllite, anhydrous ethanol and isocyanatepropyltriethoxysilane is 2-4:70-90:1-3.

[0012] Furthermore, in step S2, the mass ratio of the modified pyrophyllite, toluene, ursolic acid and catalyst is 3-4:90-110:3.5-4.1:0.3-0.7.

[0013] In this scheme, talc is surface-treated by isocyanatepropyltriethoxysilane to obtain modified talc with isocyanate groups on the surface, and then under the action of a catalyst, the isocyanate groups on the surface of the modified talc react with the hydroxyl groups in the ursolic acid structure to obtain a reinforced antibacterial filler. The reinforced antibacterial filler prepared by surface-modifying talc has excellent interface compatibility in the matrix material of the polyethylene square drain pipe, can be evenly dispersed to avoid agglomeration, and effectively enhances the mechanical strength of the polyethylene square drain pipe. At the same time, the ursolic acid grafted on its surface has a broad-spectrum antibacterial activity as a triterpenoid compound. It is loaded on the surface of the filler by chemical bonding, and can release active antibacterial components during the use of the polyethylene square drain pipe, thereby achieving a long-term and effective antibacterial effect. By inhibiting the attachment and reproduction of bacteria on the surface of the drain pipe, the problem of pipe wall corrosion caused by bacterial physiological activities is effectively avoided, and the use field of the polyethylene square drain pipe is effectively expanded, and its service life is extended.

[0014] Furthermore, in step S1, the concentration of the acetic acid solution in the pH adjustment using the acetic acid solution is 35-40%, and the pH is adjusted to 5-6.

[0015] Furthermore, in step S2, the catalyst is any one of stannous octoate and dibutyltin dilaurate.

[0016] Furthermore, the preparation method of the naphthalene-modified butyl rubber comprises the following steps:

[0017] SS1: Place butyl rubber in n-hexane, mix thoroughly, add formic acid, heat to 50-55°C, drop hydrogen peroxide solution, add ethanol to condense after condensation, filter, wash, and vacuum dry to obtain epoxidized butyl rubber;

[0018] SS2: Epoxidized butyl rubber and 2-naphthylamine are placed in toluene, mixed thoroughly, heated to react, and the solvent is removed by reduced pressure distillation. The product is collected to obtain naphthalene-modified butyl rubber.

[0019] Furthermore, in step SS1, the mass ratio of the butyl rubber, n-hexane, formic acid, hydrogen peroxide and ethanol is 4-6:90-110:5-8:14-16:6-10.

[0020] Furthermore, in step SS2, the mass ratio of the epoxidized butyl rubber, 2-naphthylamine and toluene is 5-6:4.5-5:90-110.

[0021] In this solution, under the action of formic acid and hydrogen peroxide, the double bonds in the butyl rubber structure are oxidized to form epoxy groups, obtaining epoxidized butyl rubber. The epoxy groups in the structure of this epoxidized butyl rubber undergo a ring-opening reaction with the amino groups in the 2-naphthylamine structure, obtaining naphthalene-modified butyl rubber. The structure of this naphthalene-modified butyl rubber contains multiple hydroxyl groups that can interact with the matrix material of the polyethylene square drainage pipe to form an entangled structure, enhancing the interfacial compatibility. At the same time, the flexible chain segments of the butyl rubber in the structure absorb stress through molecular chain slippage, and the rigid units of the naphthalene ring can effectively disperse external impact energy. The two work together to significantly improve the impact resistance of the polyethylene square drainage pipe. Moreover, the introduction of the naphthalene ring can produce a synergistic effect with the reinforcing antibacterial filler, further improving the mechanical strength of the polyethylene square drainage pipe, making it not easy to generate cracks and breakages during long-term use, and significantly extending its service life.

[0022] Further, in step SS1, the mass fraction of hydrogen peroxide in the dropped hydrogen peroxide solution is 30-35%, and the dropping rate is 0.5-0.6 ml / min.

[0023] Further, in step SS2, the temperature of the temperature-raising reaction is 80-85 °C, and the time is 5-8 h.

[0024] A production method of an enhanced polyethylene square drainage pipe includes the following steps:

[0025] Step 1: Put high-density polyethylene, maleic anhydride-grafted polyethylene, reinforcing antibacterial filler, naphthalene-modified butyl rubber, flame retardant, antioxidant, ultraviolet absorber, lubricant, and plasticizer into a high-speed mixer, and mix them evenly to obtain a premix.

[0026] Step 2: Transfer the premix to a twin-screw extruder, set the screw speed to 250-300 r / min, and the extrusion temperature to 200-210 °C. After melting and extruding, cool and vacuum shape it to obtain a polyethylene square drainage pipe.

[0027] The beneficial effects of the present invention:

[0028] By preparing the reinforcing antibacterial filler and naphthalene-modified butyl rubber and participating in the preparation process of the polyethylene square drainage pipe, the prepared polyethylene square drainage pipe can have excellent tensile strength, impact resistance, and wear resistance, and at the same time endow it with excellent antibacterial effects, greatly expanding the application fields of the polyethylene square drainage pipe and extending its service life.

[0029] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. Description of the drawings

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0031] Figure 1 It is the preparation flow chart of the polyethylene square drainage pipe of the present invention. Specific embodiments

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] The preparation methods of the reinforcing antibacterial filler and naphthalene-modified butyl rubber in the following embodiments and comparative examples of the present invention are as follows:

[0034] I. Preparation of the reinforcing antibacterial filler

[0035] S1: Place 3 g of pyrophyllite in 80 ml of absolute ethanol. After magnetic stirring at room temperature for 10 min, ultrasonically disperse for 3 min, add 2 g of isocyanatopropyltriethoxysilane, fully stir and mix, then adjust the pH to 5 with a 35% acetic acid solution by mass fraction, raise the temperature to 45 °C, stir for 5 h, then filter, wash, and vacuum dry to obtain modified pyrophyllite;

[0036] The isocyanate content in the modified pyrophyllite is tested by titration method. The specific operation method is as follows: Take 1 g of modified pyrophyllite as a sample, add it to 50 ml of toluene, ultrasonically extract for 30 min, centrifuge to collect the supernatant, repeat the extraction 3 times and then combine the extraction solutions. Add 10 ml of a 0.1 mol / L dibutylamine toluene solution to the extraction solution, shake well and react at room temperature for 1 h, then add 50 ml of isopropanol and 1 ml of bromophenol blue indicator, and titrate with a 0.1 mol / L hydrochloric acid standard solution until the color changes and does not change within 30 s. At the same time, perform a blank test and calculate according to the following formula: Isocyanate content (mmol / g) = (V 0 - V 1 ) × C HCl × 1000 / m; In the formula, V O is the volume of the hydrochloric acid standard solution consumed in the blank test (ml); V 1 is the volume of the hydrochloric acid standard solution consumed in the sample test (ml); C HClis the concentration of hydrochloric acid standard solution (mol / L); m is the sample mass (g); after calculation, the isocyanate content in the modified pyrophyllite is 3.2mmol / g.

[0037] S2: Place 3.5 g of modified pyrophyllite in 100 ml of toluene, and after ultrasonic dispersion for 15 minutes, add 3.8 g of ursolic acid and 0.5 g of stannous octoate, mix thoroughly, heat to 75 ° C and stir to react for 8 hours. After the reaction is completed, centrifuge, wash, and vacuum dry to obtain a reinforced antibacterial filler.

[0038] The isocyanate group content in the reinforced antibacterial filler was tested by titration method. The specific operation method was the same as step S1. After calculation, the isocyanate content in the reinforced antibacterial filler was 0.5 mmol / g, which was significantly lower than the isocyanate content in the modified pyrophyllite. This was due to the reaction of the isocyanate groups on the surface of the modified pyrophyllite with ursolic acid, resulting in consumption.

[0039] 2. Preparation of naphthalene-modified butyl rubber

[0040] SS1: 5g of butyl rubber was placed in 100ml of n-hexane, and after thorough mixing, 6ml of formic acid was added, and the temperature was raised to 50°C. 15ml of 32% hydrogen peroxide solution was added dropwise at a dropping speed of 0.5ml / min. After the addition, 8ml of ethanol was added for coagulation. After complete coagulation, the epoxidized butyl rubber was obtained by filtering, washing, and vacuum drying.

[0041] SS2: 5.5 g of epoxidized butyl rubber and 4.8 g of 2-naphthylamine were placed in 100 ml of toluene, mixed thoroughly, heated to 80°C for reaction for 5 h, and the solvent was removed by reduced pressure distillation. The product was collected to obtain naphthalene-modified butyl rubber.

[0042] The nitrogen content of epoxidized butyl rubber and naphthalene-modified butyl rubber was analyzed using VarioELcube elemental analyzer. The results showed that epoxidized butyl rubber does not contain nitrogen, while the nitrogen content of naphthalene-modified butyl rubber is 3.9%. In comparison, the appearance of nitrogen in naphthalene-modified butyl rubber is due to the introduction of nitrogen after the ring-opening reaction between the epoxy group in the epoxidized butyl rubber structure and the amino group in the 2-naphthylamine structure.

[0043] Example 1

[0044] A reinforced polyethylene square drainage pipe comprises the following raw materials in parts by weight: 70 parts of high-density polyethylene, 15 parts of maleic anhydride grafted polyethylene, 10 parts of reinforcing antibacterial filler, 12 parts of naphthalene-modified butyl rubber, 3 parts of triphenylphosphine, 2 parts of antioxidant 168, 1 part of ultraviolet absorber UV-3030, 1 part of stearic acid, and 1 part of dioctyl phthalate;

[0045] The production method of this enhanced polyethylene square drainage pipe includes the following steps:

[0046] Step 1: Put high-density polyethylene, maleic anhydride grafted polyethylene, reinforcing antibacterial filler, naphthalene modified butyl rubber, triphenylphosphine, antioxidant 168, ultraviolet absorber UV-3030, stearic acid, and dioctyl phthalate in parts by weight into a high-speed mixer, and mix them evenly to obtain a premix;

[0047] Step 2: Transfer the premix to a twin-screw extruder, set the screw speed to 250 r / min, the extrusion temperature to 200 °C, and after melting and extrusion, cool and vacuum shape it to obtain a polyethylene square drainage pipe.

[0048] Example 2

[0049] An enhanced polyethylene square drainage pipe includes the following raw materials in parts by weight: 80 parts of high-density polyethylene, 18 parts of maleic anhydride grafted polyethylene, 11 parts of reinforcing antibacterial filler, 13 parts of naphthalene modified butyl rubber, 4 parts of flame retardant DOPO, 2.5 parts of antioxidant 1098, 2 parts of ultraviolet absorber UV-326, 1.5 parts of zinc stearate, and 2 parts of diisononyl phthalate;

[0050] The production method of this enhanced polyethylene square drainage pipe includes the following steps:

[0051] Step 1: Put high-density polyethylene, maleic anhydride grafted polyethylene, reinforcing antibacterial filler, naphthalene modified butyl rubber, flame retardant DOPO, antioxidant 1098, ultraviolet absorber UV-326, zinc stearate, and diisononyl phthalate in parts by weight into a high-speed mixer, and mix them evenly to obtain a premix;

[0052] Step 2: Transfer the premix to a twin-screw extruder, set the screw speed to 280 r / min, the extrusion temperature to 205 °C, and after melting and extrusion, cool and vacuum shape it to obtain a polyethylene square drainage pipe.

[0053] Example 3

[0054] An enhanced polyethylene square drainage pipe includes the following raw materials in parts by weight: 90 parts of high-density polyethylene, 20 parts of maleic anhydride grafted polyethylene, 12 parts of reinforcing antibacterial filler, 15 parts of naphthalene modified butyl rubber, 5 parts of di-tert-butyl chloromethyl phosphate, 3 parts of antioxidant 1135, 3 parts of ultraviolet absorber UV-P, 2 parts of white oil, and 3 parts of castor oil;

[0055] The production method of this enhanced polyethylene square drainage pipe includes the following steps:

[0056] Step 1. Put high-density polyethylene, maleic anhydride grafted polyethylene, reinforcing antibacterial filler, naphthalene modified butyl rubber, di-tert-butyl chloromethyl phosphate, antioxidant 1135, ultraviolet absorber UV-P, white oil, and castor oil in parts by weight into a high-speed mixer, and mix them evenly to obtain a premix;

[0057] Step 2. Transfer the premix to a twin-screw extruder, set the screw speed to 300 r / min, the extrusion temperature to 210 °C, and after melt extrusion, cool and vacuum shape it to obtain a polyethylene square drainage pipe.

[0058] Comparative Example 1

[0059] A polyethylene square drainage pipe comprises the following raw materials in parts by weight: 80 parts of high-density polyethylene, 18 parts of maleic anhydride grafted polyethylene, 13 parts of naphthalene modified butyl rubber, 4 parts of flame retardant DOPO, 2.5 parts of antioxidant 1098, 2 parts of ultraviolet absorber UV-326, 1.5 parts of zinc stearate, and 2 parts of diisononyl phthalate;

[0060] The production method of this polyethylene square drainage pipe comprises the following steps:

[0061] Step 1. Put high-density polyethylene, maleic anhydride grafted polyethylene, naphthalene modified butyl rubber, flame retardant DOPO, antioxidant 1098, ultraviolet absorber UV-326, zinc stearate, and diisononyl phthalate in parts by weight into a high-speed mixer, and mix them evenly to obtain a premix;

[0062] Step 2. Transfer the premix to a twin-screw extruder, set the screw speed to 280 r / min, the extrusion temperature to 205 °C, and after melt extrusion, cool and vacuum shape it to obtain a polyethylene square drainage pipe.

[0063] Comparative Example 2

[0064] A polyethylene square drainage pipe comprises the following raw materials in parts by weight: 80 parts of high-density polyethylene, 18 parts of maleic anhydride grafted polyethylene, 11 parts of reinforcing antibacterial filler, 4 parts of flame retardant DOPO, 2.5 parts of antioxidant 1098, 2 parts of ultraviolet absorber UV-326, 1.5 parts of zinc stearate, and 2 parts of diisononyl phthalate;

[0065] The production method of this polyethylene square drainage pipe comprises the following steps:

[0066] Step 1. Put high-density polyethylene, maleic anhydride grafted polyethylene, reinforcing antibacterial filler, flame retardant DOPO, antioxidant 1098, ultraviolet absorber UV-326, zinc stearate, and diisononyl phthalate in parts by weight into a high-speed mixer, and mix them evenly to obtain a premix;

[0067] Step 2: Transfer the premix to a twin-screw extruder, set the screw rotation speed at 280 r / min, the extrusion temperature at 205°C, cool and vacuum shape the product after melt extrusion to obtain a polyethylene square drainage pipe.

[0068] Comparative Example 3

[0069] A polyethylene square drainage pipe, comprising the following raw materials in parts by weight: 80 parts of high-density polyethylene, 18 parts of maleic anhydride grafted polyethylene, 11 parts of modified pyrophyllite, 13 parts of naphthalene modified butyl rubber, 4 parts of flame retardant DOPO, 2.5 parts of antioxidant 1098, 2 parts of ultraviolet absorber UV-326, 1.5 parts of zinc stearate, 2 parts of diisononyl phthalate;

[0070] The production method of this polyethylene square drainage pipe comprises the following steps:

[0071] Step 1: Place high-density polyethylene, maleic anhydride grafted polyethylene, modified pyrophyllite, naphthalene modified butyl rubber, flame retardant DOPO, antioxidant 1098, ultraviolet absorber UV-326, zinc stearate, and diisononyl phthalate in parts by weight into a high-speed mixer, and mix evenly to obtain a premix;

[0072] Step 2: Transfer the premix to a twin-screw extruder, set the screw rotation speed at 280 r / min, the extrusion temperature at 205°C, cool and vacuum shape the product after melt extrusion to obtain a polyethylene square drainage pipe.

[0073] Comparative Example 4

[0074] A polyethylene square drainage pipe, comprising the following raw materials in parts by weight: 80 parts of high-density polyethylene, 18 parts of maleic anhydride grafted polyethylene, 11 parts of reinforcing antibacterial filler, 13 parts of butyl rubber, 4 parts of flame retardant DOPO, 2.5 parts of antioxidant 1098, 2 parts of ultraviolet absorber UV-326, 1.5 parts of zinc stearate, 2 parts of diisononyl phthalate;

[0075] The production method of this polyethylene square drainage pipe comprises the following steps:

[0076] Step 1: Place high-density polyethylene, maleic anhydride grafted polyethylene, reinforcing antibacterial filler, butyl rubber, flame retardant DOPO, antioxidant 1098, ultraviolet absorber UV-326, zinc stearate, and diisononyl phthalate in parts by weight into a high-speed mixer, and mix evenly to obtain a premix;

[0077] Step 2: Transfer the premix to a twin-screw extruder, set the screw rotation speed at 280 r / min, the extrusion temperature at 205°C, cool and vacuum shape the product after melt extrusion to obtain a polyethylene square drainage pipe.

[0078] Performance detection

[0079] The polyethylene square drainage pipes prepared in Examples 1 - 3 and Comparative Examples 1 - 4 were made into samples that met the specifications. The tensile strength of the samples was detected with reference to the standard GB / T1040.1 - 2018; the antibacterial performance of the samples was detected with reference to the standard GB / T31402 - 2023; the impact performance of the samples was detected with reference to the standard GB / T1843 - 2008. The specific detection results are shown in the following table:

[0080] Tensile strength / MPa Antibacterial rate / % <![CDATA[Izod impact strength / KJ / m 2 > Example 1 40.9 99.2 41.9 Example 2 41.6 99.4 42.4 Example 3 40.4 99.3 42.2 Comparative Example 1 31.7 42.8 36.5 Comparative Example 2 33.5 98.6 31.9 Comparative Example 3 37.8 43.1 37.7 Comparative Example 4 33.9 98.9 35.3

[0081] As can be seen from the above table, the samples prepared in Examples 1 - 3 all have excellent mechanical strength, impact resistance, and antibacterial effects. In the sample prepared in Comparative Example 1, no reinforcing antibacterial filler was added, so it does not have antibacterial effects and the tensile strength is average. In the sample prepared in Comparative Example 2, no naphthalene - modified butyl rubber was added, so the impact resistance is poor. In the sample prepared in Comparative Example 3, no reinforcing antibacterial filler was added, but modified pyrophyllite was directly added. This sample has good mechanical strength but no antibacterial effect. In the sample prepared in Comparative Example 4, butyl rubber was directly added without improvement. The mechanical strength and impact resistance of this sample are inferior to those of the examples.

[0082] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above - mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0083] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications, supplements, or use similar methods to substitute for the specific embodiments described, as long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. An enhanced polyethylene square drainage pipe, characterized in that: The invention comprises the following raw materials in parts by weight: 70-90 parts of high-density polyethylene, 15-20 parts of maleic anhydride grafted polyethylene, 10-12 parts of reinforcing antibacterial filler, 12-15 parts of naphthalene modified butyl rubber, 3-5 parts of flame retardant, 2-3 parts of antioxidant, 1-3 parts of ultraviolet absorber, 1-2 parts of lubricant and 1-3 parts of plasticizer; the reinforcing antibacterial filler is prepared by reacting modified pyrophyllite with ursolic acid under the action of a catalyst; the modified pyrophyllite is prepared by surface-modifying pyrophyllite with isocyanatepropyltriethoxysilane; the naphthalene modified butyl rubber is prepared by reacting epoxidized butyl rubber with 2-naphthylamine; the epoxidized butyl rubber is prepared by epoxidizing butyl rubber under the action of formic acid and hydrogen peroxide.

2. The reinforced polyethylene square drainage pipe according to claim 1, characterized in that: The flame retardant is any one of triphenylphosphine, flame retardant DOPO, and di-tert-butyl chloromethyl phosphate; the antioxidant is any one of antioxidant 168, antioxidant 1098, and antioxidant 1135; the ultraviolet absorber is any one of ultraviolet absorber UV-3030, ultraviolet absorber UV-326, and ultraviolet absorber UV-P; the lubricant is any one of stearic acid, zinc stearate, and white oil; the plasticizer is any one of dioctyl phthalate, diisononyl phthalate, and castor oil.

3. The reinforced polyethylene square drainage pipe according to claim 1, characterized in that: The preparation method of the reinforced antibacterial filler comprises the following steps: S1: placing pyrophyllite in anhydrous ethanol, stirring magnetically for 10-15 minutes at room temperature, ultrasonically dispersing for 3-5 minutes, adding isocyanatepropyltriethoxysilane, stirring and mixing thoroughly, adjusting the pH with acetic acid solution, heating to 45-50°C and stirring for 5-6 hours, then filtering, washing, and vacuum drying to obtain modified pyrophyllite; S2: Place the modified pyrophyllite in toluene, ultrasonically disperse for 15-20 minutes, add ursolic acid and a catalyst, mix thoroughly, heat to 75-80°C, stir and react for 8-10 hours, centrifuge, wash and vacuum dry after the reaction to obtain a reinforced antibacterial filler.

4. The reinforced polyethylene square drainage pipe according to claim 3, characterized in that: In step S1, the concentration of the acetic acid solution in the step of adjusting the pH with the acetic acid solution is 35-40%, and the pH is adjusted to 5-6.

5. The reinforced polyethylene square drainage pipe according to claim 3, characterized in that: In step S2, the catalyst is any one of stannous octoate and dibutyltin dilaurate.

6. The reinforced polyethylene square drainage pipe according to claim 1, characterized in that: The preparation method of the naphthalene-modified butyl rubber comprises the following steps: SS1: Place butyl rubber in n-hexane, mix thoroughly, add formic acid, heat to 50-55°C, drop hydrogen peroxide solution, add ethanol to condense after condensation, filter, wash, and vacuum dry to obtain epoxidized butyl rubber; SS2: Epoxidized butyl rubber and 2-naphthylamine are placed in toluene, mixed thoroughly, heated to react, and the solvent is removed by reduced pressure distillation. The product is collected to obtain naphthalene-modified butyl rubber.

7. The reinforced polyethylene square drainage pipe according to claim 6, characterized in that: In step SS1, the mass fraction of the hydrogen peroxide solution in the dripped hydrogen peroxide solution is 30-35%, and the dripping speed is 0.5-0.6 ml / min.

8. The reinforced polyethylene square drainage pipe according to claim 6, characterized in that: In step SS2, the temperature of the temperature-raising reaction is 80-85° C. and the time is 5-8 hours.

9. A method for producing the reinforced polyethylene square drainage pipe according to claim 1, characterized in that: The following steps are involved: Step 1, placing high-density polyethylene, maleic anhydride grafted polyethylene, reinforcing antibacterial filler, naphthalene-modified butyl rubber, flame retardant, antioxidant, ultraviolet absorber, lubricant, and plasticizer in a high-speed mixer, and mixing them thoroughly to obtain a premix; Step 2: Transfer the premix to a twin-screw extruder, set the screw speed to 250-300 r / min, the extrusion temperature to 200-210°C, cool and vacuum shape after melt extrusion, and obtain a polyethylene square drainage pipe.

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