Scratch-proof and scald-proof protective material for polyolefin pipeline

Abstract

The invention discloses a polyolefin pipeline anti-scratch and anti-scald protective material, the protective material is prepared by taking a polyolefin granulation material, color master batch and azodicarbonamide as raw materials, and the polyolefin granulation material is prepared by taking polyolefin, modified hollow glass beads, maleic anhydride grafted polyolefin, a lubricant, a stabilizer and an antioxidant as raw materials. The protective material is prepared, the protective material is compounded outside an original polyolefin pipeline through a multi-layer co-extrusion technology to serve as a protective layer, and the protective layer has very high anti-scratching, anti-scalding, heat-insulating and anti-impact performance, so that the polyolefin composite pipe is prevented from being scratched and scalded in the transporting, loading and unloading processes; and the service life of the polyolefin composite pipe is obviously prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of polyolefin pipes, and in particular relates to a polyolefin pipeline anti-scratch and anti-scald protective material. Background Art

[0002] Polyolefin plastic pipes are favored by people for their advantages such as corrosion resistance, long service life, rich variety of pipe products, light weight, convenient construction, small water flow resistance, energy saving, simple daily maintenance, and low comprehensive engineering cost. Plastic pipe products have also entered thousands of households and gradually become popular in people's daily lives. However, due to the many links from production to end users, the situation is complicated, and the non-standard transportation and loading and unloading construction can easily cause scratches and burns on the pressure-bearing layer of polyolefin pipes. When polyolefin pipes are used for more than a certain number of years, water leakage accidents are prone to occur. Summary of the invention

[0003] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a polyolefin pipe anti-scratch and anti-scalding protective material. The present invention prepares a protective material, and the protective material is compounded on the outside of the original polyolefin pipe as a protective layer through a multi-layer co-extrusion technology. The protective layer has strong anti-scratch, anti-scalding, heat-insulating and impact-resistant properties, thereby avoiding scratches and scalding caused by the polyolefin composite pipe during transportation and loading and unloading, and significantly extending the service life of the polyolefin composite pipe.

[0004] The technical solution adopted to achieve the above-mentioned purpose of the present invention is:

[0005] A polyolefin pipe anti-scratch and anti-scalding protective material is prepared from the following raw materials:

[0006] Polyolefin granules 80-120 parts

[0007] Masterbatch 1-3 parts

[0008] 0.5-3 parts of azodicarbonamide;

[0009] The polyolefin granules are prepared from the following raw materials:

[0010]

[0011] The D50 particle size of the hollow glass microspheres is 15-50 μm.

[0012] Further, the preparation method of the modified hollow glass microspheres is as follows:

[0013] The silane coupling agent is dissolved in ethanol, and then water is added to obtain a mixed solution. Hollow glass microbeads are added to the mixed solution, and ultrasonic vibration is performed at room temperature. Then, the hollow glass microbeads are taken out and dried to obtain modified hollow glass microbeads.

[0014] Furthermore, the silane coupling agent is at least one of silane coupling agent KH550 and silane coupling agent KH560.

[0015] Furthermore, the lubricant is selected from at least one of stearic acid, PE wax and calcium stearate.

[0016] Furthermore, the stabilizer is zinc oxide.

[0017] Furthermore, the antioxidant is selected from at least one of antioxidant 1010 and antioxidant 168.

[0018] Furthermore, the masterbatch is selected from at least one of titanium dioxide and carbon black.

[0019] Further, the preparation method of the polyolefin granules is:

[0020] Add polyolefin, modified hollow glass microspheres, maleic anhydride grafted polyolefin, lubricant, stabilizer and antioxidant into a twin-screw extruder, extrude and granulate to obtain polyolefin granules.

[0021] A polyolefin composite pipe comprises an inner layer and an outer layer, wherein the inner layer is a polyolefin pipe body, and the outer layer is a protective layer (protective layer thickness ≥ 0.05 mm) formed by extruding the protective material according to claim 1.

[0022] Furthermore, the polyolefin composite pipe is composited by multi-layer co-extrusion technology.

[0023] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0024] 1. Hollow glass microspheres are added to the formula of the protective material of the present invention. The hollow glass microspheres have strong anti-scratch ability, thereby significantly improving the anti-scratch performance of the protective material.

[0025] 2. The modified hollow glass microspheres of a certain size are added to the formula of the protective material of the present invention, and cooperate with a certain mass of foaming agent to significantly improve the anti-scalding, heat-insulating and impact-resistant properties of the protective material, and the scratch-resistant performance is improved to a certain extent. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to specific embodiments.

[0027] The raw materials used in the following examples and comparative examples are as follows:

[0028] Polypropylene was purchased from Zhenhai Refining and Chemical Company of Sinopec Corporation with the brand name PP HMS20Z.

[0029] Maleic anhydride grafted polypropylene was purchased from Guangzhou Hecheng Chemical Co., Ltd. with the brand name Grakcy HS1-009A.

[0030] PE wax was purchased from Qingdao Enze Chemical Co., Ltd.

[0031] Silane coupling agent KH550 was purchased from Tianjin Chemical Reagent Factory No. 1.

[0032] Silane coupling agent KH560 was purchased from Tianjin Chemical Reagent Factory No. 1.

[0033] Example 1

[0034] A polypropylene pipe anti-scratch and anti-scalding protective material is prepared from the following raw materials:

[0035] Polypropylene granules 100 parts

[0036] 2 parts carbon black

[0037] 1 part of azodicarbonamide.

[0038] The above-mentioned polypropylene granules are prepared from the following raw materials:

[0039]

[0040] The bead preparation method of the above-mentioned polypropylene granules is as follows:

[0041] 1. Mix silane coupling agent KH550 and silane coupling agent KH560 in a mass ratio of 1:1 to obtain a mixed silane coupling agent, mix the mixed silane coupling agent with ethanol in a volume ratio of 1:5, mix well to obtain a silane coupling agent solution. Add water 3 times the volume of the silane coupling agent solution to dilute it to obtain a mixed solution.

[0042] 2. Add hollow glass microspheres with an average diameter of 30 μm to the mixed solution, the mass of the hollow glass microspheres being 1.8% of the mass of the mixed silane coupling agent. Ultrasonic vibration is performed at room temperature for 10 minutes, the hollow glass microspheres are taken out, and placed in a drying oven at 120°C for 60 minutes to obtain modified hollow glass microspheres.

[0043] 3. Add polypropylene, modified hollow glass microspheres, maleic anhydride grafted polyolefin, PE wax, calcium stearate, antioxidant 1010, antioxidant 168 and zinc oxide into a twin-screw extruder, extrude and granulate to obtain polyolefin granules.

[0044] A polyolefin composite pipe comprises an inner layer of a polyolefin pipe body and an outer protective layer (protective layer thickness 0.15 mm) formed by the above-mentioned polypropylene pipe anti-scratch and anti-scald protective material, and the polyolefin composite pipe is formed by co-extrusion of the polyolefin pipe body and the protective layer.

[0045] Example 2

[0046] A polypropylene pipe anti-scratch and anti-scalding protective material is prepared from the following raw materials:

[0047] Polypropylene granules 90 parts

[0048] 2.5 parts of carbon black

[0049] 1.5 parts of azodicarbonamide.

[0050] The above-mentioned polypropylene granules are prepared from the following raw materials:

[0051]

[0052] The bead preparation method of the above-mentioned polypropylene granules is as follows:

[0053] 1. Mix silane coupling agent KH550 and silane coupling agent KH560 in a mass ratio of 1:1 to obtain a mixed silane coupling agent, mix the mixed silane coupling agent with ethanol in a volume ratio of 1:5, mix well to obtain a silane coupling agent solution. Add water 3 times the volume of the silane coupling agent solution to dilute it to obtain a mixed solution.

[0054] 2. Add hollow glass microspheres with a diameter of 40 μm to the mixed solution, the mass of the hollow glass microspheres being 1.8% of the mass of the mixed silane coupling agent. Ultrasonic vibration is performed at room temperature for 10 minutes, the hollow glass microspheres are taken out, and placed in a drying oven at 120°C for 60 minutes to obtain modified hollow glass microspheres.

[0055] 3. Add polypropylene, modified hollow glass microspheres, maleic anhydride grafted polyolefin, PE wax, calcium stearate, antioxidant 1010, antioxidant 168 and zinc oxide into a twin-screw extruder, extrude and granulate to obtain polyolefin granules.

[0056] A polyolefin composite pipe comprises an inner layer of a polyolefin pipe body and an outer protective layer (protective layer thickness 0.12 mm) formed by the above-mentioned polypropylene pipe anti-scratch and anti-scald protective material base, and the polyolefin composite pipe is formed by co-extrusion of the polyolefin pipe body and the protective layer.

[0057] Comparative Example 1

[0058] The raw materials of this comparative example are slightly different from those of Example 1. The average diameter of the hollow glass microspheres in this comparative example is 5 μm.

[0059] Comparative Example 2

[0060] The raw materials of this comparative example are slightly different from those of Example 1. The average diameter of the hollow glass microspheres in this comparative example is 60 μm.

[0061] Comparative Example 3

[0062] The raw materials of this comparative example are slightly different from those of Example 1, and the mass part of azodicarbonamide is 0.1 mass part.

[0063] Comparative Example 4

[0064] The raw materials of this comparative example are slightly different from those of Example 1, and the mass parts of azodicarbonamide are 6 mass parts.

[0065] Comparative Example 5

[0066] The raw materials of this comparative example are slightly different from those of Example 1. In this comparative example, the average diameter of the hollow glass microspheres is 5 μm, and the mass fraction of azodicarbonamide is 6 mass fractions.

[0067] Comparative Example 6

[0068] The raw materials of this comparative example are slightly different from those of Example 1. In this comparative example, the average diameter of the hollow glass microspheres is 5 μm, and the mass portion of azodicarbonamide is 0.1 mass portion.

[0069] Comparative Example 7

[0070] The raw materials of this comparative example are slightly different from those of Example 1. In this comparative example, the average diameter of the hollow glass microspheres is 60 μm, and the mass portion of azodicarbonamide is 0.1 mass portion.

[0071] Comparative Example 8

[0072] The raw materials of this comparative example are slightly different from those of Example 1. In this comparative example, the average diameter of the hollow glass microspheres is 60 μm, and the mass fraction of azodicarbonamide is 6 mass fractions.

[0073] The density (GB / T-1033.1), flexural modulus (GB / T-9341), scratch resistance (according to the PV3952 method, the ΔL data size is judged on the stipple 002 under a load of 10N) and appearance of the protective materials prepared in Examples 1-2 and Comparative Examples 1-8 are tested. The results are shown in Table 1 below (the present invention requires that the prepared protective material sample has a density of ≤0.8g / cm3, a flexural modulus of ≤900MPa, a cross scratch ΔL of <2.0, and an acceptable appearance):

[0074] Table 1

[0075]

[0076] The impact resistance (drop hammer impact test, test conditions 0°C, 3h, 5kg, 1m, 20 samples, GB / T-14152) and scalding and heat insulation performance (scalding test, test conditions PP-R hot melt machine, set temperature 260°C, 20 punch contacts the pipe, that is, the punch contacts the outer protective layer of the pipe for a certain period of time, then removes the pipe, peels off the protective layer and observes the surface of the pipe (removes the outer protective layer of the pipe, the surface of the internal pressure-bearing layer), and records the maximum contact time without obvious scalding on the surface of the internal pressure-bearing layer) of the polyolefin composite pipe prepared in Examples 1-2 and Comparative Examples 1-8. From the results in Table 1, the verification test is continued (the present invention requires that the polyolefin composite pipe prepared has a drop hammer test TIR≤10% and a scalding test≥5s), and the test results are shown in Table 2 below:

[0077] Table 2

[0078]

[0079]

Claims

1. A polyolefin pipe anti-scratch and anti-scalding protective material, characterized in that Prepared from the following raw materials: Polyolefin granules 80-120 parts Masterbatch 1-3 parts 0.5-2.5 parts of azodicarbonamide; The polyolefin granules are prepared from the following raw materials: The average particle size of the hollow glass microspheres is 15-50 μm.

2. The polyolefin pipe anti-scratch and anti-scalding protective material according to claim 1, characterized in that The preparation method of the modified hollow glass microspheres is as follows: The silane coupling agent is dissolved in ethanol, and then water is added to obtain a mixed solution. Hollow glass microbeads are added to the mixed solution, and ultrasonic vibration is performed at room temperature. Then, the hollow glass microbeads are taken out and dried to obtain modified hollow glass microbeads.

3. The polyolefin pipe anti-scratch and anti-scalding protective material according to claim 2, characterized in that: The silane coupling agent is at least one of silane coupling agent KH550 and silane coupling agent KH560.

4. The polyolefin pipe anti-scratch and anti-scalding protective material according to claim 1, characterized in that: The lubricant is selected from at least one of stearic acid, PE wax and calcium stearate.

5. The polyolefin pipe anti-scratch and anti-scalding protective material according to claim 1, characterized in that: The stabilizer is zinc oxide.

6. The polyolefin pipe anti-scratch and anti-scalding protective material according to claim 1, characterized in that: The antioxidant is selected from at least one of antioxidant 1010 and antioxidant 168.

7. The polyolefin pipe anti-scratch and anti-scalding protective material according to claim 1, characterized in that: The color masterbatch is selected from at least one of titanium dioxide and carbon black.

8. The polyolefin pipe anti-scratch and anti-scalding protective material according to claim 1, characterized in that The preparation method of the polyolefin granulated material is: Add polyolefin, modified hollow glass microspheres, maleic anhydride grafted polyolefin, lubricant, stabilizer and antioxidant into a twin-screw extruder, extrude and granulate to obtain polyolefin granules.

9. A polyolefin composite pipe, characterized in that: It comprises an inner layer and an outer layer, wherein the inner layer is a polyolefin pipe body, and the outer layer is a protective layer formed by extruding the protective material according to claim 1.

10. The polyolefin composite pipe according to claim 8, characterized in that: The polyolefin composite pipe is composited by multi-layer co-extrusion technology.

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