Light-weight and low-noise flame-retardant modified polyethylene material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of mining materials, and particularly relates to a light-weight and low-noise flame-retardant modified polyethylene material as well as a preparation method and application thereof. The material comprises the following components in parts by weight: 60-80 parts of PE resin, 5-10 parts of magnesium hydroxide, 2-3 parts of a smoke suppressant, 2-3 parts of an antistatic agent, 10-30 parts of a filling enhancer and 1-2 parts of a coupling agent. The material has excellent flame retardance and light weight, and can effectively prevent static accumulation.

Description

Technical Field

[0001] The invention belongs to the technical field of mining materials, and specifically relates to a lightweight, low-noise flame-retardant modified polyethylene material and a preparation method and application thereof. Background Art

[0002] Mine ventilation ducts play a vital role in underground working environments such as coal mines, and their performance is directly related to the safe production of mines. Their main functions are: ① Supplying sufficient fresh air to underground personnel to ensure normal activities and operations; ② Diluting harmful gases and smoke underground to a harmless level and discharging them to the ground; ③ Regulating the temperature and humidity underground to improve the climate conditions in the mine; ④ Controlling wind flow when a disaster occurs to create good working conditions for disaster relief work.

[0003] Existing mine ventilation ducts are made of traditional PE materials. The application of traditional PE materials in mine ventilation ducts has many shortcomings, such as poor flame retardancy, easy static electricity accumulation, heavy weight and difficulty in installation. These problems are very likely to cause fire or explosion accidents in the mine environment.

[0004] Therefore, developing a modified polyethylene material with both excellent flame retardant properties and good antistatic properties is of great significance for improving the safety performance of mine ventilation ducts. Summary of the invention

[0005] The present invention develops a lightweight, low-noise flame-retardant modified polyethylene material. By selecting magnesium hydroxide as a flame retardant and then mixing different raw materials and proportions, a lightweight, low-noise flame-retardant modified polyethylene material with a high limiting oxygen index, high surface resistivity and strong tensile strength is obtained, which is used in the preparation of mine ventilation ducts.

[0006] In order to achieve the above object, the present invention can adopt the following technical solutions:

[0007] On the one hand, the present invention provides a lightweight, low-noise flame-retardant modified polyethylene material, which includes, by weight: 60 to 80 parts of PE resin, 5 to 10 parts of magnesium hydroxide, 2 to 3 parts of smoke suppressant, 2 to 3 parts of antistatic agent, 10 to 30 parts of filling reinforcing agent and 1 to 2 parts of coupling agent.

[0008] Preferably, the lightweight, low-noise flame-retardant modified polyethylene material further comprises a conductive filler, in parts by weight: 1 to 3 parts of the conductive filler.

[0009] Preferably, the conductive filler is conductive carbon black.

[0010] Preferably, the lightweight, low-noise flame-retardant modified polyethylene material further comprises an antioxidant, in parts by weight: 1 to 3 parts of antioxidant.

[0011] Preferably, the antioxidant is antioxidant 1076.

[0012] Preferably, the lightweight, low-noise flame-retardant modified polyethylene material comprises, by weight: 60-65 parts of PE resin, 5-10 parts of magnesium hydroxide, 2-3 parts of smoke suppressants, 2-3 parts of antistatic agents, 25-30 parts of filling reinforcing agents, 1-1.5 parts of coupling agents, 2 parts of antioxidants and 1 part of conductive fillers.

[0013] Preferably, the lightweight, low-noise flame-retardant modified polyethylene material comprises, by weight: 60 parts of PE resin, 5 parts of magnesium hydroxide, 2 parts of smoke suppressant, 3 parts of antistatic agent, 30 parts of filling reinforcing agent, 1.5 parts of coupling agent, 2 parts of antioxidant and 1 part of conductive filler.

[0014] Preferably, the lightweight, low-noise flame-retardant modified polyethylene material comprises, by weight: 62.5 parts of PE resin, 6.5 parts of magnesium hydroxide, 2.5 parts of smoke suppressant, 2.5 parts of antistatic agent, 25 parts of filling reinforcing agent, 1.5 parts of coupling agent, 2 parts of antioxidant and 1 part of conductive filler.

[0015] Preferably, the smoke suppressant is a compound mixture of zinc borate and molybdenum trioxide in a mass ratio of 3:1.5.

[0016] Preferably, the antistatic agent is nano zinc oxide.

[0017] Preferably, the coupling agent is a silane coupling agent.

[0018] Preferably, the filler reinforcement is hollow glass microspheres.

[0019] In another aspect, the present invention provides a method for preparing a lightweight, low-noise flame-retardant modified polyethylene material, which specifically comprises the following steps:

[0020] (1) Mixing the raw materials according to the above weight parts, wherein the coupling agent is first mixed with the reinforcing agent and then mixed with the other ingredients and stirred evenly to obtain a mixture;

[0021] (2) The mixed material is placed in an extruder, and under the action of high temperature and high pressure, it is plasticized into a viscous flow state, extruded and drawn, and cooled and granulated to obtain a lightweight, low-noise flame-retardant modified polyethylene material.

[0022] Preferably, in step (2), cooling is performed by cooling water, the flow rate of the cooling water is in the range of 8 t / h to 12 t / h, and the temperature of the cooling water is in the range of 0°C to 10°C.

[0023] Preferably, in step (2), the extruder is a conical twin-screw extruder, and the barrel temperature is 7 zones, and the barrel temperature is distributed from low to high: zone 1 160°C, zone 2 170°C, zone 3 175°C, zone 4 185°C, zone 5 190°C, zone 6 195°C, zone 7 190°C; melt pressure 20MPa~25MPa; feeding speed 8r / min~10r / min.

[0024] Another aspect of the present invention provides an application of the lightweight, low-noise flame-retardant modified polyethylene material in the present invention in the preparation of mining ventilation pipes.

[0025] The beneficial effects of the present invention include at least: the lightweight, low-noise flame-retardant modified polyethylene material provided by the present invention has excellent flame retardancy and light weight, and can effectively prevent static electricity accumulation; by adding magnesium hydroxide flame retardant, magnesium hydroxide can significantly improve the flame retardancy and thermal stability of PE; by adding nano zinc oxide antistatic agent, static electricity accumulation is effectively prevented, and the safety of the material in the mine environment is improved; by adding hollow glass microsphere filling reinforcement, the strength of the material is improved and the density of the product is reduced; it is also beneficial to reduce noise, and the lightweight is convenient for operation and installation. DETAILED DESCRIPTION

[0026] The examples are provided to better illustrate the present invention, but the content of the present invention is not limited to the examples. Therefore, those skilled in the art may make non-essential improvements and adjustments to the implementation scheme according to the above invention content, which still fall within the scope of protection of the present invention. The experimental methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, can be obtained from commercial channels.

[0027] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. Unless the context has a significantly different meaning, expressions in the singular include expressions in the plural. As used herein, it should be understood that terms such as "include", "have", "include" are intended to indicate the presence of features, numbers, operations, components, parts, elements, materials or combinations. The terms of the present invention are disclosed in the specification, and are not intended to exclude the possibility that one or more other features, numbers, operations, components, parts, elements, materials or combinations thereof may exist or may be added. As used herein, " / " may be interpreted as "and" or "or", depending on the circumstances.

[0028] The embodiment of the present invention provides a lightweight, low-noise flame-retardant modified polyethylene material, which includes, by weight: 70 to 85 parts of PE resin, 5 to 10 parts of flame retardant, 2 to 3 parts of smoke suppressant, 2 to 4 parts of antistatic agent, 10 to 20 parts of filling reinforcing agent and 1 to 2 parts of coupling agent.

[0029] In some specific examples, the lightweight, low-noise flame-retardant modified polyethylene material includes, by weight: 60-65 parts of PE resin, 5-10 parts of magnesium hydroxide, 2-3 parts of smoke suppressants, 2-3 parts of antistatic agents, 25-30 parts of filling reinforcements, 1-1.5 parts of coupling agents, 2 parts of antioxidants and 1 part of conductive fillers.

[0030] In some specific examples, the lightweight, low-noise flame-retardant modified polyethylene material includes, by weight: 60 parts of PE resin, 5 parts of magnesium hydroxide, 2 parts of smoke suppressant, 3 parts of antistatic agent, 30 parts of filling reinforcing agent, 1.5 parts of coupling agent, 2 parts of antioxidant and 1 part of conductive filler.

[0031] In some specific examples, the lightweight, low-noise flame-retardant modified polyethylene material includes, by weight: 62.5 parts of PE resin, 6.5 parts of magnesium hydroxide, 2 parts of smoke suppressant, 2.5 parts of antistatic agent, 25 parts of filling reinforcing agent, 1.5 parts of coupling agent, 2 parts of antioxidant and 1 part of conductive filler.

[0032] In some specific examples, the flame retardant mentioned above is one or two of magnesium hydroxide; the smoke suppressant is a compound mixture of zinc borate and molybdenum trioxide; in the smoke suppressant, the mass ratio of zinc borate to molybdenum trioxide is 3:1.5; the antistatic agent is nano zinc oxide; the coupling agent is a silane coupling agent, the manufacturer is Fuqingyuan Innovation Materials Co., Ltd., model KH560; the filling reinforcement agent is hollow glass microspheres, the manufacturer is Wenzhou Jufeng International Trade Co., Ltd., model MS-531.

[0033] It should be noted that the addition of magnesium hydroxide flame retardant in the present invention can significantly improve the flame retardancy and thermal stability of PE, and the composite material mixed with PE has the best comprehensive performance and is better than other flame retardants; in addition, magnesium hydroxide flame retardant also has the characteristics of low cost and environmental friendliness; in addition, the addition of antistatic agent effectively prevents static electricity accumulation and improves the safety of materials in mine environments; at the same time, by adding filling reinforcing agent, the strength of the material can be improved, and the density of the product can be reduced, which is convenient for operation and installation. In short, the PE material of the present invention has little effect on the mechanical properties of the material while maintaining excellent flame retardant and antistatic properties, and is environmentally friendly and low-cost.

[0034] In some specific examples, the antistatic agent is nano zinc oxide, and the weight percentage is 2 to 4 parts of nano zinc oxide, which can be 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts, etc., preferably 3 parts or 2.5 parts.

[0035] In some specific examples, the coupling agent is a silane coupling agent, and the weight percentage is: 1 to 2 parts of silane coupling agent; 1 part, 1.25 parts, 1.5 parts or 2 parts can be selected, and 1.5 parts or 1 part is preferred.

[0036] In some specific examples, the lightweight, low-noise flame-retardant modified polyethylene material also includes an antioxidant, calculated by weight: 1 to 3 parts of antioxidant; the antioxidant is antioxidant 1076, which can be 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts, etc., preferably 2 parts.

[0037] In some specific examples, the lightweight, low-noise flame-retardant modified polyethylene material also includes a conductive filler, calculated by weight: 1 to 3 parts of conductive filler; the conductive filler is conductive carbon black, which can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, preferably 1 part.

[0038] It should be noted that the antibacterial agent, coupling agent, antioxidant and conductive filler in the present invention are well known in the art, and the above selection is preferred.

[0039] The embodiment of the present invention also provides a method for preparing a lightweight, low-noise flame-retardant modified polyethylene material, which specifically comprises the following steps:

[0040] (1) Mixing the raw materials according to the above weight parts, wherein the coupling agent is first mixed with the reinforcing agent and then mixed with the other ingredients and stirred evenly to obtain a mixture;

[0041] (2) placing the mixed material in an extruder, and plasticizing it into a viscous flow state under high temperature and high pressure melting, extruding and drawing, cooling and granulating, so as to obtain a lightweight, low-noise flame-retardant modified polyethylene material; the extruder is a conical twin-screw extruder, and the barrel temperature is 7 zones, and the barrel temperature is distributed from low to high: zone 1 160°C, zone 2 170°C, zone 3 175°C, zone 4 185°C, zone 5 190°C, zone 6 195°C, zone 7 190°C; the main machine current is 50-55A; the melt pressure is 20-25MPa; the feed speed is 8-10r / min; cooling water is used for cooling and granulation, the flow range of cooling water is 8-12t / h, and the temperature range of cooling water is 0-10°C.

[0042] Another aspect of the present invention provides an application of the lightweight, low-noise flame-retardant modified polyethylene material in the present invention in the preparation of mining ventilation pipes.

[0043] It should be noted that, based on the lightweight, low-noise flame-retardant modified polyethylene material in the present invention having excellent flame retardancy and lightweight, and being able to effectively prevent static electricity accumulation, the prepared mining ventilation pipe also has the above advantages.

[0044] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with specific examples, but the content of the present invention is not limited to the following examples.

[0045] 1. Preparation of lightweight and low-noise flame-retardant modified polyethylene materials

[0046] The steps are as follows: (1) mixing the raw materials according to the above weight parts, wherein the coupling agent is first mixed with the reinforcing agent and then mixed with the others and stirred evenly to obtain a mixture;

[0047] (2) The mixed material is placed in an extruder, and under the action of high temperature and high pressure melting, the mixed material is plasticized into a viscous flow state, extruded and drawn, and cooled to form pellets. The extruder is a conical twin-screw extruder, and the barrel temperature is 7 zones, and the barrel temperature is distributed from low to high: zone 1 160°C, zone 2 170°C, zone 3 175°C, zone 4 185°C, zone 5 190°C, zone 6 195°C, zone 7 190°C; the main machine current is 50-55A; the melt pressure is 20-25MPa; the feed speed is 8-10r / min; cooling water is used for cooling and pelletizing, the flow range of cooling water is 8-12t / h, and the temperature range of cooling water is 0-10°C, so as to obtain a lightweight, low-noise flame-retardant modified polyethylene material; the anti-static flame-retardant modified PE material is observed by naked eyes, and the appearance is smooth and flat without burrs.

[0048] Example 1 to Example 10

[0049] The raw materials in Examples 1 to 10 are arranged in parts by weight according to the following Table 1, and then different modified PE materials are prepared according to the above method.

[0050] Table 1 Examples 1 to 10

[0051]

[0052] Comparative Example 1 to Comparative Example 11

[0053] The raw materials of Comparative Examples 1 to 11 are arranged in parts by weight according to the following Table 1, and then different modified PE materials are prepared according to the above method.

[0054] Table 2 Comparative Examples 1 to 10

[0055]

[0056] 2. Performance test of lightweight and low-noise flame-retardant modified polyethylene materials

[0057] In the following tests, the limiting oxygen index (LOI) test adopts GB / T2406-1993, and the sample size is 130mm×6mm×3mm; the tensile properties are measured by testing the mechanical properties of the samples using a tensile testing machine, and the experiment is based on GB / T1040.1-2006, with a tensile rate of 100mm / min; the surface resistance test is based on standard ASTMD257, and a resistance meter is used to measure the resistance value of the surface of the formula material.

[0058] The limiting oxygen index (LOI), surface resistivity and tensile strength of Examples 1 to 10 and Comparative Examples 1 to 11 were tested respectively according to the above test methods. The results are shown in Table 3 below.

[0059] Table 3 Performance of Examples 1 to 10 and Comparative Examples 1 to 11

[0060]

[0061]

[0062] As can be seen from Table 3, the modified polyolefin materials prepared in Examples 1 to 10 of the present invention are compared with the modified polyolefin material formulas of Comparative Examples 1 to 11. The flame retardancy, thermal stability, and antistatic properties of the modified polyolefin materials of the embodiments of the present invention are greatly improved, and the strength is also improved.

[0063] In the present invention, by adding magnesium hydroxide flame retardant, magnesium hydroxide can significantly improve the flame retardancy and thermal stability of PE, and the composite material prepared by mixing magnesium hydroxide with PE has the best comprehensive performance. In addition, by using magnesium hydroxide, in collaboration with a smoke suppressant, the flame retardant effect can be further improved, and the magnesium hydroxide flame retardant also improves the mechanical properties of the modified polyolefin material; in addition, the magnesium hydroxide flame retardant has the characteristics of low cost, environmental friendliness, etc.

[0064] The invention effectively prevents static electricity accumulation by adding the nano zinc oxide antistatic agent, thereby improving the safety of the material in a mine environment.

[0065] The present invention not only improves the strength of the material but also reduces the density of the product by adding hollow glass microspheres as a filler reinforcing agent; it is also beneficial to reduce noise and is convenient for operation and installation due to its light weight.

[0066] In summary, the PE material of the present invention has little effect on the mechanical properties of the material while maintaining excellent flame retardancy and antistatic properties; at the same time, the use of inorganic flame retardants reduces production costs and is environmentally friendly.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. A lightweight, low-noise flame-retardant modified polyethylene material, characterized in that: The composition comprises, by weight: 60-80 parts of PE resin, 5-10 parts of magnesium hydroxide, 2-3 parts of smoke suppressant, 2-3 parts of antistatic agent, 10-30 parts of filler reinforcing agent and 1-2 parts of coupling agent.

2. The lightweight, low-noise flame-retardant modified polyethylene material according to claim 1, characterized in that: The lightweight, low-noise flame-retardant modified polyethylene material further includes a conductive filler, which comprises 1 to 3 parts of the conductive filler by weight.

3. The lightweight, low-noise flame-retardant modified polyethylene material according to claim 1 or 2, characterized in that: The lightweight, low-noise flame-retardant modified polyethylene material also includes an antioxidant, which contains 1 to 3 parts of antioxidant in parts by weight.

4. The lightweight, low-noise flame-retardant modified polyethylene material according to claim 3, characterized in that: The lightweight, low-noise flame-retardant modified polyethylene material includes, by weight: 60-65 parts of PE resin, 5-10 parts of magnesium hydroxide, 2-3 parts of smoke suppressant, 2-3 parts of antistatic agent, 25-30 parts of filling reinforcing agent, 1-1.5 parts of coupling agent, 2 parts of antioxidant and 1 part of conductive filler.

5. The lightweight, low-noise flame-retardant modified polyethylene material according to claim 4, characterized in that: The lightweight, low-noise flame-retardant modified polyethylene material includes, by weight: 60 parts of PE resin, 5 parts of magnesium hydroxide, 2 parts of smoke suppressant, 3 parts of antistatic agent, 30 parts of filling reinforcing agent, 1.5 parts of coupling agent, 2 parts of antioxidant and 1 part of conductive filler.

6. The lightweight, low-noise flame-retardant modified polyethylene material according to claim 4, characterized in that: The lightweight, low-noise flame-retardant modified polyethylene material includes, by weight: 62.5 parts of PE resin, 6.5 parts of magnesium hydroxide, 2.5 parts of smoke suppressant, 2.5 parts of antistatic agent, 25 parts of filling reinforcing agent, 1.5 parts of coupling agent, 2 parts of antioxidant and 1 part of conductive filler.

7. The lightweight, low-noise flame-retardant modified polyethylene material according to claim 1, characterized in that: The smoke suppressant is a compound mixture of zinc borate and molybdenum trioxide in a mass ratio of 3:1.5; the antistatic agent is nano zinc oxide; the coupling agent is a silane coupling agent; and the filling reinforcing agent is hollow glass microspheres.

8. The lightweight, low-noise flame-retardant modified polyethylene material according to claim 3, characterized in that: The conductive filler is conductive carbon black; the antioxidant is antioxidant 1076.

9. A method for preparing the lightweight, low-noise flame-retardant modified polyethylene material according to claim 1, characterized in that: The following steps are involved: (1) Mixing the raw materials according to the above weight parts, wherein the coupling agent is first mixed with the reinforcing agent and then mixed with the other ingredients and stirred evenly to obtain a mixture; (2) The mixed material is placed in an extruder, and under the action of high temperature and high pressure, it is plasticized into a viscous flow state, extruded and drawn, and cooled and granulated to obtain a lightweight, low-noise flame-retardant modified polyethylene material.

10. Application of a lightweight, low-noise flame-retardant modified polyethylene material, characterized in that: The lightweight, low-noise flame-retardant modified polyethylene material of any one of claims 1 to 8 is used in the preparation of mining ventilation pipes.

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