阅读说明：本技术 一种阻燃聚乙烯通信管及其制备方法 (Flame-retardant polyethylene communication pipe and preparation method thereof ) 是由 章振华 陈毅明 裘杨燕 孙东华 王进 陈建 汤成群 于 2020-06-03 设计创作，主要内容包括：本发明涉及通信管道技术领域,公开了一种阻燃聚乙烯通信管及其制备方法,原材料包括低密度聚乙烯60-80份,低密度聚乙烯包覆红磷料20-30份,抗氧剂1-2份,增韧剂1.2-1.6份,润滑剂3-4份；制备时,将低密度聚乙烯熔融,在搅拌状态下加入抗氧剂、增韧剂和润滑剂,搅拌均匀,得到第一混合物,挤出造粒,获得A料粒；将低密度聚乙烯包覆红磷料中加入抗氧剂,熔融,在2000-3000r/min的速度下搅拌5-10min后,得到第二混合物,挤出造粒,获得B料粒；将A1中和步骤A2中得到的A料粒和B料粒混合均匀,然后投入到双螺杆挤出机中挤出,得到聚乙烯通信管材料。本发明能够在保证聚乙烯通信管具有阻燃性能的同时保证具有良好的力学性能。(The invention relates to the technical field of communication pipelines and discloses a flame-retardant polyethylene communication pipe and a preparation method thereof, wherein the raw materials comprise 60-80 parts of low-density polyethylene, 20-30 parts of low-density polyethylene-coated red phosphorus material, 1-2 parts of antioxidant, 1.2-1.6 parts of flexibilizer and 3-4 parts of lubricant; during preparation, melting the low-density polyethylene, adding the antioxidant, the toughening agent and the lubricant under a stirring state, uniformly stirring to obtain a first mixture, and extruding and granulating to obtain material particles A; adding an antioxidant into the low-density polyethylene coated red phosphorus material, melting, stirring at the speed of 2000-3000r/min for 5-10min to obtain a second mixture, and extruding and granulating to obtain material B particles; and D, uniformly mixing the pellets A and B obtained in the step A2 and neutralizing the pellets A1, and then putting the mixture into a double-screw extruder for extrusion to obtain the polyethylene communication pipe material. The invention can ensure that the polyethylene communication pipe has flame retardant property and good mechanical property.)

1. The flame-retardant polyethylene communication pipe is characterized by comprising the following raw materials in parts by weight: 60-80 parts of low-density polyethylene, 20-30 parts of low-density polyethylene coated red phosphorus material, 1-2 parts of antioxidant, 1.2-1.6 parts of toughening agent and 3-4 parts of lubricant.

2. A flame retardant polyethylene communication tube according to claim 1, wherein: the flame-retardant polyethylene communication pipe comprises the following raw materials in parts by weight: 70 parts of low-density polyethylene, 25 parts of low-density polyethylene-coated red phosphorus material, 1.5 parts of antioxidant, 1.4 parts of toughening agent and 3.5 parts of lubricant.

3. A flame retardant polyethylene communication tube according to claim 2, wherein: the antioxidant is one or more of antioxidant 1076, antioxidant 3114 or antioxidant CA.

4. A flame retardant polyethylene communication tube according to claim 3, wherein: the toughening agent is any one of copolymer of polyoctene and polyethylene and copolymer of maleic anhydride grafted polyoctene and polyethylene.

5. A flame retardant polyethylene communication tube according to claim 4, wherein: the lubricant is pentaerythritol stearate. The pentaerythritol stearate has excellent lubricating property and good compatibility with polyethylene.

6. The method of making a flame retardant polyethylene communication tube of claim 5, wherein: comprises the following steps of (a) carrying out,

a1, melting low-density polyethylene at the temperature of 100-120 ℃, adding an antioxidant, a toughening agent and a lubricant under the stirring state, uniformly stirring to obtain a first mixture, putting the first mixture into a co-rotating meshed parallel double-screw granulator, and extruding and granulating to obtain material granules A;

a2, adding an antioxidant into the low-density polyethylene coated red phosphorus material, then melting at the temperature of 100-120 ℃, stirring at the speed of 2000-3000r/min for 5-10min to obtain a second mixture, putting the first mixture into a homodromous meshed parallel double-screw granulator, and extruding and granulating to obtain material B particles;

a3, uniformly mixing the A pellets and the B pellets obtained in the step A1 and the step A2, and then putting the mixture into a double-screw extruder for extrusion to obtain a polyethylene communication pipe material;

and A4, plasticizing and molding the polyethylene communication pipe material into the polyethylene communication pipe.

7. The method of making a flame retardant polyethylene communication tube of claim 6, wherein: the ratio of the antioxidant used in the steps A1 and A2 is 7: 3.

8. The method of making a flame retardant polyethylene communication tube of claim 7, wherein: in the steps A1 and A2, in a co-rotating meshed parallel twin-screw granulator, the process conditions of extrusion granulation in each stage are as follows: the temperature of the first section is 140 ℃, the temperature of the second section is 150 ℃, the temperature of the third section is 160 ℃, the temperature of the fourth section is 180 ℃, the temperature of the fifth section is 190 ℃, the temperature of the sixth section is 200 ℃, the temperature of the machine head is 195 ℃, the temperature of the melt is 190 ℃, the feeding speed is 19.5r/min, the rotating speed of the main machine is 40-50r/min, and the traction speed is 40-50 r/min.

9. The method of making a flame retardant polyethylene communication tube of claim 8, wherein: the process conditions of the single-screw extruder in the step A3 are that the cylinder temperature is 160-.

10. The method of making a flame retardant polyethylene communication tube of claim 9, wherein: the preparation method of the low-density polyethylene coated red phosphorus material comprises the following steps,

b1, adding the low-density polyethylene with the particle size of 1-3um into the NaOH solution for 10-20min, washing with deionized water after soaking, and drying for later use;

b2, immersing low-density polyethylene and red phosphorus in ethanol, and then performing laser drilling by using a nanosecond laser under an ultrasonic stirring state, wherein the pulse width of the laser is 2-3ns, the wavelength is 1064nm, the power is 2-3W, and the repetition frequency is 10 kHz;

b3, after the processing is finished, maintaining for 1-3h under ultrasonic dispersion, and filling red phosphorus in micropores of the low-density polyethylene by a physical vapor deposition method under the pressure of 2 Mpa;

b4, gradually evaporating the ethanol at the temperature of 60-70 ℃ to obtain the density polyethylene coated red phosphorus material.

Technical Field

The invention relates to the technical field of communication pipelines, in particular to a flame-retardant polyethylene communication pipe and a preparation method thereof.

Background

In recent years, with the progress of urbanization, the construction of communication networks has been actively carried out. Polyethylene is a thermoplastic resin prepared by polymerizing ethylene, and is suitable for preparing communication pipes due to the characteristics of no odor, no toxicity, good chemical stability and resistance to most of acid and alkali at room temperature. However, the existing polyethylene pipelines have some defects, sometimes because of some irresistible natural reasons or artificial reasons, the polyethylene pipelines are burnt, and some difficult-to-handle results are caused.

In order to avoid the communication pipe from catching fire and burning in use, the polyethylene communication pipe is generally used to be added with a flame retardant, and the red phosphorus flame retardant is added into the flame retardant mostly at present, so that the red phosphorus flame retardant has reasonable flame retardant property, and the red phosphorus flame retardant is added into the material to enable the material to indirectly have the flame retardant property, thereby effectively preventing the fire from being ignited. However, the research and application of the red phosphorus flame retardant still have some development problems to be solved urgently.

The red phosphorus flame retardant is applied to the polyethylene communication pipe, and the main problems of poor processing characteristics of red phosphorus, poor compatibility with polyethylene resin and poor mechanical property of the processed and manufactured polyethylene communication pipe are solved.

Disclosure of Invention

In view of the above, the present invention provides a flame retardant polyethylene communication tube and a preparation method thereof, which can ensure that the polyethylene communication tube has flame retardant properties and good mechanical properties.

The invention solves the technical problems by the following technical means:

the flame-retardant polyethylene communication pipe comprises the following raw materials in parts by weight: 60-80 parts of low-density polyethylene, 20-30 parts of low-density polyethylene coated red phosphorus material, 1-2 parts of antioxidant, 1.2-1.6 parts of toughening agent and 3-4 parts of lubricant.

Further, the flame-retardant polyethylene communication pipe comprises the following raw materials in parts by weight: 70 parts of low-density polyethylene, 25 parts of low-density polyethylene-coated red phosphorus material, 1.5 parts of antioxidant, 1.4 parts of toughening agent and 3.5 parts of lubricant.

Further, the antioxidant is one or more of antioxidant 1076, antioxidant 3114 or antioxidant CA.

Further, the toughening agent is any one of a copolymer of polyoctene and polyethylene and a copolymer of maleic anhydride grafted polyoctene and polyethylene.

Further, the lubricant is pentaerythritol stearate. The pentaerythritol stearate has excellent lubricating property and good compatibility with polyethylene.

A preparation method of a flame-retardant polyethylene communication pipe comprises the following steps,

a1, melting low-density polyethylene at the temperature of 100-120 ℃, adding an antioxidant, a toughening agent and a lubricant under the stirring state, uniformly stirring to obtain a first mixture, putting the first mixture into a co-rotating meshed parallel double-screw granulator, and extruding and granulating to obtain material granules A;

a2, adding an antioxidant into the low-density polyethylene coated red phosphorus material, then melting at the temperature of 100-120 ℃, stirring at the speed of 2000-3000r/min for 5-10min to obtain a second mixture, putting the first mixture into a homodromous meshed parallel double-screw granulator, and extruding and granulating to obtain material B particles;

a3, uniformly mixing the A pellets and the B pellets obtained in the step A1 and the step A2, and then putting the mixture into a double-screw extruder for extrusion to obtain a polyethylene communication pipe material;

and A4, plasticizing and molding the polyethylene communication pipe material into the polyethylene communication pipe.

Further, the ratio of the antioxidant used in steps a1 and a2 was 7: 3.

Further, in the steps A1 and A2, in a co-rotating meshed parallel twin-screw granulator, the process conditions of extrusion granulation in each stage are as follows: the temperature of the first section is 140 ℃, the temperature of the second section is 150 ℃, the temperature of the third section is 160 ℃, the temperature of the fourth section is 180 ℃, the temperature of the fifth section is 190 ℃, the temperature of the sixth section is 200 ℃, the temperature of the machine head is 195 ℃, the temperature of the melt is 190 ℃, the feeding speed is 19.5r/min, the rotating speed of the main machine is 38r/min, and the traction speed is 38 r/min.

Further, the process conditions in the single-screw extruder in the step A3 are as follows: the barrel temperature was 180 ℃, 185 ℃, 190 ℃, 200 ℃ and the screw speed was 20 rpm.

Further, the preparation method of the low-density polyethylene coated red phosphorus material comprises the following steps,

b1, adding the low-density polyethylene with the particle size of 1-3um into the NaOH solution for 10-20min, washing with deionized water after soaking, and drying for later use;

b2, immersing low-density polyethylene and red phosphorus in ethanol, and then performing laser drilling by using a nanosecond laser under an ultrasonic stirring state, wherein the pulse width of the laser is 2-3ns, the wavelength is 1064nm, the power is 2-3W, and the repetition frequency is 10 kHz;

b3, after the processing is finished, maintaining for 1-3h under ultrasonic dispersion, and filling red phosphorus in micropores of the low-density polyethylene by a physical vapor deposition method under the pressure of 2 Mpa;

b4, gradually evaporating the ethanol at the temperature of 60-70 ℃ to obtain the density polyethylene coated red phosphorus material.

The invention has the beneficial effects that:

the low-density polyethylene coated red phosphorus material is added into the polyethylene communication pipe, nanosecond punching is firstly carried out on the low-density polyethylene during preparation of the low-density polyethylene coated red phosphorus material, and the red phosphorus is filled in the low-density polyethylene during punching; if the polyethylene communication pipe is burnt, the red phosphorus filled in the polyethylene communication pipe can play a flame retardant function. Because red phosphorus adds into in the polyethylene pipe for adopting the mode of punching the interpolation, it promotes the flame retardant property of polyethylene under the condition that does not influence polyethylene pipe mechanical properties after adding into.

Detailed Description

The present invention will be described in detail below with reference to examples 1 to 4: