A flame retardant PE communication pipe and preparation method thereof

Abstract

The present invention relates to the technical field of polyethylene pipes, and in particular to a flame-retardant PE communication pipe and a preparation method thereof, wherein the flame-retardant PE communication pipe comprises the following raw materials by weight: 80-100 parts of polyethylene resin, 10-30 parts of functional masterbatch, 1-3 parts of compatibilizer, 0.5-2 parts of antioxidant, 2-5 parts of lubricant and 0.1-1 parts of thermal stabilizer, wherein the functional masterbatch is made of functional polymer material, flame retardant and synergistic flame retardant. The purpose is to make the PE communication pipe have good flame retardant properties and mechanical properties and be able to adapt to different environments.

Description

Technical Field

[0001] The invention relates to the technical field of polyethylene pipes, and in particular to a flame-retardant PE communication pipe and a preparation method thereof. Background Art

[0002] Polyethylene (PE) refers to a polymer formed by free radical polymerization of ethylene monomers. It is one of the most produced general-purpose plastics. It is a lightweight, non-toxic thermoplastic with good mechanical strength, excellent electrical insulation and chemical corrosion resistance. It is easy to mold and process. It is widely used in wire and cable, chemical, food, packaging, machinery, electronic communications, home decoration and civil engineering industries. PE (polyethylene) pipes are one of the most common pipes. They have the advantages of low-temperature impact resistance, chemical corrosion resistance, and wear resistance. They are widely used in water supply, drainage, heating, gas supply, agricultural irrigation, water conservancy projects, communications, cables and various industrial devices.

[0003] PE communication pipes are widely used in sheathed pipe systems for outdoor communication cables and optical cables, including bureau relay pipes, feeder pipes, distribution pipes, dedicated network pipes, and communication pipes of specially specified lengths. They are highly applicable and suitable for the laying of cables, wires, and many other cables. They are suitable for the laying of sheathed pipes for urban communication optical cables, low-voltage cables, cable TV networks, multimedia transmission network lines, and the laying, isolation, and protection of indoor wires and cables in buildings. Therefore, the flame retardant properties of PE communication pipes are particularly important.

[0004] At present, flame retardants are generally added when preparing PE communication pipes. Flame retardants can be divided into two types: halogen flame retardant and halogen-free flame retardant. Among them, although the halogen flame retardant is added in a small amount and has high flame retardant performance, it will volatilize a large amount of toxic smoke when it burns, causing "secondary disasters" and there are also environmental problems. There are many choices of halogen-free flame retardant materials, and different flame retardant formulas achieve different flame retardant effects. For example, the general addition of hydrated hydroxide is too large, which affects the processing performance and some mechanical properties. The application environment of PE communication pipes is diverse. In order to adapt to the current ever-increasing application requirements, the flame retardant performance of existing PE communication pipes needs to be improved. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a flame retardant PE communication pipe and a preparation method thereof, so that the PE communication pipe has good flame retardant properties and mechanical properties and can adapt to different environments.

[0006] The present invention solves the above technical problems by the following technical means:

[0007] A flame retardant PE communication pipe comprises the following raw materials in parts by weight: 80-100 parts of polyethylene resin, 10-30 parts of functional masterbatch, 1-3 parts of compatibilizer, 0.5-2 parts of antioxidant, 2-5 parts of lubricant and 0.1-1 parts of heat stabilizer, wherein the functional masterbatch is made of functional polymer material, flame retardant and synergistic flame retardant.

[0008] By adding flame-retardant functional masterbatch into polyethylene, the communication pipe made of polyethylene has good flame-retardant properties and mechanical properties and can adapt to a variety of environments; and by adding processing aids, the processing performance of polyethylene and functional masterbatch in the preparation process can be improved.

[0009] Preferably, the polyethylene resin is one or a combination of high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene.

[0010] Further preferably, the polyethylene resin is a mixture of low-density polyethylene and medium-density polyethylene, and the mass ratio of low-density polyethylene to medium-density polyethylene is 1:0.35. The melt index of the low-density polyethylene is 3-40 g / 10 min, and the melt index of the medium-density polyethylene is 0.1-35 g / 10 min.

[0011] Preferably, the compatibilizer is one or a combination of PE-g-ST, PP-g-ST, ABS-g-MAH, PE-g-MAH, and PP-g-MAH.

[0012] More preferably, the compatibilizer is PE-g-MAH. Maleic anhydride grafted polyethylene as a compatibilizer can improve the interface bonding ability between the functional masterbatch and the polyethylene resin and improve the dispersion uniformity of the functional masterbatch in the polyethylene.

[0013] Preferably, the antioxidant is one or a combination of antioxidant 1010, antioxidant 168, antioxidant 736, and antioxidant AT-10.

[0014] More preferably, the antioxidant is a mixture of antioxidant 168 and antioxidant AT-10, and the mass ratio of antioxidant 168 to antioxidant AT-10 is 1:1.

[0015] Preferably, the lubricant is one or a combination of stearic acid, oxidized polyethylene wax, polyethylene wax, glyceryl monostearate, glyceryl distearate or pentaerythritol monostearate; and the heat stabilizer is an environmentally friendly calcium zinc stabilizer.

[0016] Further preferably, the lubricant is polyethylene wax and glyceryl monostearate, wherein the polyethylene wax serves as an external lubricant, glyceryl monostearate serves as an internal lubricant, and the mass ratio of polyethylene wax to glyceryl monostearate is 1:1.

[0017] Preferably, the functional masterbatch comprises the following raw materials in parts by weight: 30-50 parts of EVA resin, 3-8 parts of flame retardant, 1-3 parts of synergistic flame retardant and 0.1-1 part of dispersant.

[0018] More preferably, the flame retardant is modified zirconium phosphate.

[0019] In this scheme, the preparation of modified zirconium phosphate includes the following steps:

[0020] α-zirconium phosphate is prepared into nano zirconium phosphate by ball milling, the nano zirconium phosphate is dispersed in water, and then an ethylamine aqueous solution is slowly added and slowly stirred to form a suspension for use; trimethylchlorosilane is slowly added to the nano zirconium phosphate suspension, and slowly stirred for 2-5 hours at 30-40°C. After the stirring is completed, it is washed, filtered and dried to obtain modified zirconium phosphate.

[0021] Zirconium phosphate can be used as a flame retardant material. The preparation of nano zirconium phosphate is beneficial to improve the dispersion performance of zirconium phosphate. Pre-supported zirconium phosphate can be obtained through the action of ethylamine. Trimethylchlorosilane is added to the pre-supported zirconium phosphate and reacted to obtain trimethylchlorosilane intercalation-modified zirconium phosphate, thereby improving the dispersion performance of zirconium phosphate, the bonding performance with polymers and the flame retardant performance. It can catalyze the cross-linking of polymers into carbon during combustion to form a "barrier" to block the transmission of combustible gases, oxygen and heat. Combined with synergistic flame retardants, it can improve the flame retardant efficiency, form a denser carbon layer, and improve the flame retardant effect.

[0022] More preferably, the synergistic flame retardant is one or a combination of ammonium polyphosphate, pentaerythritol, phenoxy polyphosphazene and melamine phosphate; in this embodiment, the synergistic flame retardant is preferably phenoxy polyphosphazene.

[0023] As a synergistic flame retardant, phenoxy polyphosphazene has low volatility and high temperature stability. When the polymer burns, it can absorb more heat and further enhance the flame retardant effect of PE pipes.

[0024] Further preferably, the dispersant is polyethylene wax, which can improve the dispersibility of the flame retardant and the synergistic flame retardant in the EVA resin and facilitate the subsequent dispersion in the polyethylene resin.

[0025] Preferably, the preparation of the functional masterbatch comprises the following steps:

[0026] B1. Place the EVA resin in a mixer, stir evenly, heat to 90-120°C, continue stirring for 3-5 minutes, add flame retardant, synergistic flame retardant and dispersant, continue stirring for 2-4 minutes to obtain a premix;

[0027] B2. Transfer the mixed material into a screw extruder, extrude and granulate to obtain functional masterbatch.

[0028] EVA resin has good chemical stability, aging resistance, ozone resistance, water resistance, corrosion resistance, vibration resistance, thermal insulation, processability, environmental stress cracking resistance and large filler tolerance. By first dispersing the flame retardant and the synergistic flame retardant in the EVA resin, the flame retardant properties of the EVA resin are increased without changing the properties of the EVA resin to form a flame retardant masterbatch. When added to polyethylene, it can not only improve the light stability and mechanical properties of polyethylene, but also improve the flame retardant properties of polyethylene.

[0029] The present application also discloses a method for preparing the flame-retardant PE communication pipe, comprising the following steps:

[0030] A1. Put polyethylene resin and functional masterbatch into a mixer, stir evenly, heat to 130-150℃, add compatibilizer, continue stirring for 3-5min, then add antioxidant, lubricant and heat stabilizer, stir evenly to obtain a mixture;

[0031] A2. Transfer the mixed material into a screw extruder, extrude and granulate to obtain a flame retardant PE masterbatch;

[0032] A3. Transfer the flame-retardant PE masterbatch into the molding machine, extrude, size, pull, cool and shape to obtain the flame-retardant PE communication tube.

[0033] By first melt-blending the polyethylene resin and the functional masterbatch and then adding a compatibilizer, the functional masterbatch can improve the compatibility of EVA resin and polyethylene and the dispersibility of the flame retardant in polyethylene when blending and modifying polyethylene, and improve the processing rheology and mechanical properties of polyethylene; by adding antioxidants, lubricants and heat stabilizers, the polyethylene pipe has good antioxidant properties and the processing conditions of the polyethylene pipe are made wider.

[0034] Preferably, in step A2, the melting temperature of the screw extruder is 160-200° C., and the rotation speed is 250-350 r / min.

[0035] The invention adopting the above scheme has the following beneficial effects:

[0036] 1. By adding functional masterbatch to polyethylene, it can not only improve the flame retardant properties of polyethylene, but also improve the mechanical properties of polyethylene, so that it has excellent flame retardant effect with less addition amount;

[0037] 2. The PE pipe prepared in this application has good mechanical properties and flame retardant properties, and can be used as a communication pipe. When used as a communication pipe, it can adapt to a variety of environments and can also be used as other pipes, such as wiring pipes, cable protection pipes, etc. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments:

[0039] Example 1, Preparation of flame retardant PE communication pipe

[0040] In this embodiment, polyethylene uses low-density polyethylene and medium-density polyethylene, wherein the low-density polyethylene uses Saudi Arabian sabic 1905UMS, and its melt index is 5g / 10min. The medium-density polyethylene uses Korean SK DX800, and its melt index is 0.64g / 10min. EVA uses Yangzi BASF V6110M, and its melt index is 5.6-6.4g / 10min.

[0041] Preparation of modified zirconium phosphate

[0042] 10 parts by mass of α-zirconium phosphate are prepared into nano zirconium phosphate by ball milling, the nano zirconium phosphate is dispersed in 30 parts by mass of soft water, and then 13 parts by mass of ethylamine aqueous solution are slowly added, slowly stirred to form a suspension for standby use; 16.8 parts by mass of trimethylchlorosilane are slowly added to the nano zirconium phosphate suspension, slowly stirred for 2-5 hours at 30-40°C, after the stirring is completed, washed with soft water for 3-5 times, filtered, and dried at 80°C to obtain trimethylchlorosilane-modified zirconium phosphate.

[0043] Preparation of functional masterbatch

[0044] Place 30 parts by mass of EVA resin in a mixer, stir evenly, heat to 90-120° C., continue stirring for 3 minutes, add 3 parts by mass of trimethylchlorosilane-modified zirconium phosphate, 1 part by mass of phenoxy polyphosphazene and 0.1 part by mass of polyethylene wax, continue stirring for 2-4 minutes to obtain a premix;

[0045] B2. Transfer the mixed material into a screw extruder, extrude and granulate to obtain functional masterbatch.

[0046] Preparation of polyethylene tube

[0047] A1. 80 parts by mass of polyethylene resin and 10 parts by mass of functional masterbatch were put into a mixer, stirred evenly, heated to 130-150 ° C, 1 part by mass of PE-g-MAH was added, stirring was continued for 3 min, and then 0.5 parts by mass of an antioxidant 168 and an antioxidant AT-10 mixture in a mass ratio of 1: 1, 2 parts by mass of polyethylene wax and glyceryl monostearate in a mass ratio of 1: 1 and 0.1 parts by mass of an environmentally friendly calcium zinc stabilizer were added, and stirred evenly to obtain a mixture;

[0048] A2. Transfer the mixed material into a screw extruder, extrude, set the barrel zone 1 temperature to 160-180°C, zone 2 temperature to 170-190°C, zone 3 temperature to 180-200°C, zone 4 temperature to 190-200°C, extruder screw speed to 250-350r / min, granulate, and obtain flame-retardant PE masterbatch;

[0049] A3. Transfer the flame-retardant PE masterbatch into the molding machine, extrude, size, pull, cool and shape to obtain the flame-retardant PE communication tube.

[0050] Example 2, Preparation of flame retardant PE communication pipe

[0051] In this embodiment, the raw materials of polyethylene and EVA resin are the same as those in Embodiment 1, and the flame retardant is trimethylchlorosilane-modified zirconium phosphate prepared in Embodiment 1.

[0052] Preparation of functional masterbatch

[0053] 40 parts by mass of EVA resin are placed in a mixer, stirred evenly, heated to 90-120° C., stirred for 4 minutes, 6.5 parts by mass of trimethylchlorosilane-modified zirconium phosphate, 2 parts by mass of phenoxy polyphosphazene and 0.5 parts by mass of polyethylene wax are added, stirred for 2-4 minutes to obtain a premix;

[0054] B2. Transfer the mixed material into a screw extruder, extrude and granulate to obtain functional masterbatch.

[0055] Preparation of polyethylene tube

[0056] A1. 90 parts by mass of polyethylene resin and 20 parts by mass of functional masterbatch were put into a mixer, stirred evenly, heated to 130-150 ° C, 2 parts by mass of PE-g-MAH were added, stirring was continued for 3 min, and then 1 part by mass of an antioxidant 168 and an antioxidant AT-10 mixture in a mass ratio of 1: 1, 3 parts by mass of polyethylene wax and glyceryl monostearate in a mass ratio of 1: 1 and 0.45 parts by mass of an environmentally friendly calcium zinc stabilizer were added, and stirred evenly to obtain a mixture;

[0057] A2. Transfer the mixed material into a screw extruder, extrude, set the barrel zone 1 temperature to 160-180°C, zone 2 temperature to 170-190°C, zone 3 temperature to 180-200°C, zone 4 temperature to 190-200°C, extruder screw speed to 250-350r / min, granulate, and obtain flame-retardant PE masterbatch;

[0058] A3. Transfer the flame-retardant PE masterbatch into the molding machine, extrude, size, pull, cool and shape to obtain the flame-retardant PE communication tube.

[0059] Example 3, Preparation of flame retardant PE communication pipe

[0060] In this embodiment, the raw materials of polyethylene and EVA resin are the same as those in Embodiment 1, and the flame retardant is trimethylchlorosilane-modified zirconium phosphate prepared in Embodiment 1.

[0061] Preparation of functional masterbatch

[0062] Place 50 parts by mass of EVA resin in a mixer, stir evenly, heat to 90-120° C., continue stirring for 5 minutes, add 8 parts by mass of trimethylchlorosilane-modified zirconium phosphate, 3 parts by mass of phenoxy polyphosphazene and 1 part by mass of polyethylene wax, continue stirring for 2-4 minutes to obtain a premix;

[0063] B2. Transfer the mixed material into a screw extruder, extrude and granulate to obtain functional masterbatch.

[0064] Preparation of polyethylene tube

[0065] A1. 100 parts by mass of polyethylene resin and 30 parts by mass of functional masterbatch were put into a mixer, stirred evenly, heated to 130-150 ° C, 3 parts by mass of PE-g-MAH were added, stirring was continued for 3 min, and then 2 parts by mass of a mixture of antioxidant 168 and antioxidant AT-10 in a mass ratio of 1: 1, 5 parts by mass of polyethylene wax and glyceryl monostearate in a mass ratio of 1: 1 and 1 part by mass of an environmentally friendly calcium zinc stabilizer were added, and stirred evenly to obtain a mixture;

[0066] A2. Transfer the mixed material into a screw extruder, extrude, set the barrel zone 1 temperature to 160-180°C, zone 2 temperature to 170-190°C, zone 3 temperature to 180-200°C, zone 4 temperature to 190-200°C, extruder screw speed to 250-350r / min, granulate, and obtain flame-retardant PE masterbatch;

[0067] A3. Transfer the flame-retardant PE masterbatch into the molding machine, extrude, size, pull, cool and shape to obtain the flame-retardant PE communication tube.

[0068] Example 4 (Comparative Example 1), Preparation of Flame Retardant PE Communication Tube

[0069] In this embodiment, the raw materials of polyethylene and EVA resin are the same as those in Embodiment 1, the flame retardant is trimethylchlorosilane-modified zirconium phosphate prepared in Embodiment 1, and no synergistic flame retardant is used.

[0070] Preparation of functional masterbatch

[0071] Place 40 parts by mass of EVA resin in a mixer, stir evenly, heat to 90-120° C., continue stirring for 4 minutes, add 6.5 parts by mass of trimethylchlorosilane-modified zirconium phosphate and 0.5 parts by mass of polyethylene wax, continue stirring for 2-4 minutes to obtain a premix;

[0072] B2. Transfer the mixed material into a screw extruder, extrude and granulate to obtain functional masterbatch.

[0073] Preparation of polyethylene tube

[0074] A1. 90 parts by mass of polyethylene resin and 20 parts by mass of functional masterbatch were put into a mixer, stirred evenly, heated to 130-150 ° C, 2 parts by mass of PE-g-MAH were added, stirring was continued for 3 min, and then 1 part by mass of an antioxidant 168 and an antioxidant AT-10 mixture in a mass ratio of 1: 1, 3 parts by mass of polyethylene wax and glyceryl monostearate in a mass ratio of 1: 1 and 0.45 parts by mass of an environmentally friendly calcium zinc stabilizer were added, and stirred evenly to obtain a mixture;

[0075] A2. Transfer the mixed material into a screw extruder, extrude, set the barrel zone 1 temperature to 160-180°C, zone 2 temperature to 170-190°C, zone 3 temperature to 180-200°C, zone 4 temperature to 190-200°C, extruder screw speed to 250-350r / min, granulate, and obtain flame-retardant PE masterbatch;

[0076] A3. Transfer the flame-retardant PE masterbatch into the molding machine, extrude, size, pull, cool and shape to obtain the flame-retardant PE communication tube.

[0077] Example 5 (Comparative Example 2), Preparation of Flame Retardant PE Communication Tube

[0078] In this embodiment, the raw materials of polyethylene and EVA resin are the same as those in Embodiment 1, and phenoxy polyphosphazene is used as a flame retardant.

[0079] Preparation of functional masterbatch

[0080] Place 40 parts by mass of EVA resin in a mixer, stir evenly, heat to 90-120° C., continue stirring for 4 minutes, add 2 parts by mass of phenoxy polyphosphazene and 0.5 parts by mass of polyethylene wax, continue stirring for 2-4 minutes to obtain a premix;

[0081] B2. Transfer the mixed material into a screw extruder, extrude and granulate to obtain functional masterbatch.

[0082] Preparation of polyethylene tube

[0083] A1. 90 parts by mass of polyethylene resin and 20 parts by mass of functional masterbatch were put into a mixer, stirred evenly, heated to 130-150 ° C, 2 parts by mass of PE-g-MAH were added, stirring was continued for 3 min, and then 1 part by mass of an antioxidant 168 and an antioxidant AT-10 mixture in a mass ratio of 1: 1, 3 parts by mass of polyethylene wax and glyceryl monostearate in a mass ratio of 1: 1 and 0.45 parts by mass of an environmentally friendly calcium zinc stabilizer were added, and stirred evenly to obtain a mixture;

[0084] A2. Transfer the mixed material into a screw extruder, extrude, set the barrel zone 1 temperature to 160-180°C, zone 2 temperature to 170-190°C, zone 3 temperature to 180-200°C, zone 4 temperature to 190-200°C, extruder screw speed to 250-350r / min, granulate, and obtain flame-retardant PE masterbatch;

[0085] A3. Transfer the flame-retardant PE masterbatch into the molding machine, extrude, size, pull, cool and shape to obtain the flame-retardant PE communication tube.

[0086] Example 6 (Comparative Example 3), Preparation of Flame Retardant PE Communication Tube

[0087] In this embodiment, the raw material of polyethylene is the same as that in Embodiment 1, and the flame retardant is trimethylchlorosilane-modified zirconium phosphate prepared in Embodiment 1.

[0088] Preparation of polyethylene tube

[0089] A1. 90 parts by mass of polyethylene resin was added to a mixer, stirred evenly, heated to 130-150 ° C, 2 parts by mass of PE-g-MAH was added, stirring was continued for 3 min, and then 6.5 parts by mass of trimethylchlorosilane-modified zirconium phosphate, 2 parts by mass of phenoxy polyphosphazene, 1 part by mass of an antioxidant 168 and an antioxidant AT-10 in a 1:1 ratio, 3 parts by mass of polyethylene wax and glyceryl monostearate in a 1:1 ratio and 0.45 parts by mass of an environmentally friendly calcium zinc stabilizer were added, stirred evenly to obtain a mixture;

[0090] A2. Transfer the mixed material into a screw extruder, extrude, set the barrel zone 1 temperature to 160-180°C, zone 2 temperature to 170-190°C, zone 3 temperature to 180-200°C, zone 4 temperature to 190-200°C, extruder screw speed to 250-350r / min, granulate, and obtain flame-retardant PE masterbatch;

[0091] A3. Transfer the flame-retardant PE masterbatch into the molding machine, extrude, size, pull, cool and shape to obtain the flame-retardant PE communication tube.

[0092] Example 7 (Comparative Example 4), Preparation of Flame Retardant PE Communication Tube

[0093] In this embodiment, the raw material of polyethylene is the same as that in Embodiment 1, and the flame retardant is nano zirconium phosphate.

[0094] Preparation of polyethylene tube

[0095] A1. 90 parts by mass of polyethylene resin was put into a mixer, stirred evenly, heated to 130-150 ° C, 2 parts by mass of PE-g-MAH were added, stirring was continued for 3 min, and then 6.5 parts by mass of nano zirconium phosphate, 1 part by mass of antioxidant 168 and antioxidant AT-10 in a 1:1 ratio, 3 parts by mass of polyethylene wax and glyceryl monostearate in a 1:1 ratio and 0.45 parts by mass of an environmentally friendly calcium zinc stabilizer were added, and stirred to obtain a mixture;

[0096] A2. Transfer the mixed material into a screw extruder, extrude, set the barrel zone 1 temperature to 160-180°C, zone 2 temperature to 170-190°C, zone 3 temperature to 180-200°C, zone 4 temperature to 190-200°C, extruder screw speed to 250-350r / min, granulate, and obtain flame-retardant PE masterbatch;

[0097] A3. Transfer the flame-retardant PE masterbatch into the molding machine, extrude, size, pull, cool and shape to obtain the flame-retardant PE communication tube.

[0098] The polyethylene pipes prepared in Examples 1-7 were subjected to physical property tests, including tensile strength, elongation at break, vertical combustion, limiting oxygen index and oxidation induction time. The tensile strength was tested according to GB / T1040, the vertical combustion was tested according to UL94 standard, and the limiting oxygen index was tested according to GB / T2406-2008. During the test, the standards of the samples met the corresponding test requirements. The average value of 5 groups of data was taken. The test results are shown in Table 1:

[0099]

[0100] It can be seen from the data in Table 1 that the polyethylene pipes prepared in Examples 1-3 have good flame retardant properties and mechanical properties, and the comprehensive performance of Example 1 is better.

[0101] It can be seen from the data in Table 1 that in Example 4 and Example 5, the addition of trimethylchlorosilane-modified zirconium phosphate as a flame retardant is better than the addition of phenoxy polyphosphazene as a flame retardant, and the flame retardant performance is better and the limiting oxygen index is higher. The addition of trimethylchlorosilane-modified zirconium phosphate as a flame retardant and the addition of phenoxy polyphosphazene as a synergistic flame retardant have a higher limiting oxygen index than the addition of trimethylchlorosilane-modified zirconium phosphate as a flame retardant alone, and the oxidation induction time is longer.

[0102] It can be seen from the data in Table 1 that in Example 6 and Example 7, the addition of EVA resin and the preparation of functional masterbatch with flame retardants and synergistic flame retardants can improve the tensile strength and elongation at break of the polyethylene pipe, and the addition of trimethylchlorosilane-modified zirconium phosphate as a flame retardant has a better flame retardant effect than the addition of nano zirconium phosphate as a flame retardant.

[0103] The above is a detailed introduction to a flame-retardant PE communication pipe and a preparation method thereof provided by the present invention. The description of the specific embodiment is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0104] It should be noted that if no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be purchased commercially.

[0105] The above examples are intended to provide a better understanding of the present invention, and are not intended to be limiting of the best implementation mode described herein, nor are they intended to limit the content and protection scope of the present invention. Any product identical or similar to the present invention that is derived by anyone under the inspiration of the present invention or by combining the present invention with features of other prior arts shall fall within the protection scope of the present invention.

Claims

1. A flame retardant PE communication tube, It is characterized in that The invention comprises the following raw materials in parts by weight: 80-100 parts of polyethylene resin, 10-30 parts of functional masterbatch, 1-3 parts of compatibilizer, 0.5-2 parts of antioxidant, 2-5 parts of lubricant and 0.1-1 parts of heat stabilizer; The functional masterbatch comprises the following raw materials in parts by weight: 30-50 parts of EVA resin, 3-8 parts of flame retardant, 1-3 parts of synergistic flame retardant and 0.1-1 parts of dispersant; The flame retardant is modified zirconium phosphate, and the synergistic flame retardant is phenoxy polyphosphazene; The preparation of the modified zirconium phosphate comprises the following steps: α-zirconium phosphate is prepared into nano zirconium phosphate by ball milling, the nano zirconium phosphate is dispersed in water, and then an ethylamine aqueous solution is slowly added and slowly stirred to form a suspension for use; trimethylchlorosilane is slowly added to the nano zirconium phosphate suspension, and slowly stirred for 2-5 hours at 30-40°C. After the stirring is completed, it is washed, filtered and dried to obtain modified zirconium phosphate.

2. A flame-retardant PE communication pipe according to claim 1, It is characterized in that The polyethylene resin is one or a combination of high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene.

3. A flame retardant PE communication pipe according to claim 1, It is characterized in that The compatibilizer is one or a combination of PE-g-ST, PP-g-ST, ABS-g-MAH, PE-g-MAH, and PP-g-MAH.

4. The flame-retardant PE communication pipe according to claim 1, It is characterized in that The antioxidant is one or a combination of antioxidant 1010, antioxidant 168, antioxidant 736, and antioxidant AT-10.

5. The flame-retardant PE communication pipe according to claim 1, It is characterized in that The lubricant is one or a combination of stearic acid, oxidized polyethylene wax, polyethylene wax, glyceryl monostearate, glyceryl distearate or pentaerythritol monostearate; and the heat stabilizer is an environmentally friendly calcium zinc stabilizer.

6. The flame-retardant PE communication pipe according to claim 1, It is characterized in that The preparation of the functional masterbatch comprises the following steps: B1. Place the EVA resin in a mixer, stir evenly, heat to 90-120°C, continue stirring for 3-5 minutes, add flame retardant, synergistic flame retardant and dispersant, continue stirring for 2-4 minutes to obtain a premix; B2. Transfer the mixed material into a screw extruder, extrude and granulate to obtain functional masterbatch.

7. A method for preparing the flame-retardant PE communication pipe according to any one of claims 1 to 6, It is characterized in that The following steps are involved: A1. Put polyethylene resin and functional masterbatch into a mixer, stir evenly, heat to 130-150℃, add compatibilizer, continue stirring for 3-5min, then add antioxidant, lubricant and heat stabilizer, stir evenly to obtain a mixture; A2. Transfer the mixed material into a screw extruder, extrude and granulate to obtain a flame retardant PE masterbatch; A3. Transfer the flame-retardant PE masterbatch into a molding machine, extrude, sizing, draw, and cool and shape it to obtain a flame-retardant PE communication pipe.

8. According to the preparation method of a flame-retardant PE communication pipe described in claim 7, characterized in that, in the step A2, the melting temperature of the screw extruder is 160 - 200 °C, and the rotation speed is 250 - 350 r / min.

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