A low temperature resistant aerogel insulation PP-R pipe and preparation method thereof

Abstract

The present invention relates to the technical field of polypropylene pipes, and proposes a low-temperature resistant aerogel insulation PP-R pipe and a preparation method thereof. The low-temperature resistant aerogel insulation PP-R pipe includes a random copolymerization polypropylene pipe layer and an aerogel insulation layer from the inside to the outside; the raw materials of the random copolymerization polypropylene pipe layer include the following components in parts by weight: 100 parts of random copolymerization polypropylene, 2-5 parts of maleic anhydride grafted polyethylene, 0.3-0.6 parts of nucleating agent, 5-10 parts of filler, and 1-1.5 parts of antioxidant; the preparation method of the filler includes the following steps: 10-20 parts of inorganic filler, 0.5-1 parts of 2-methyl-3-acetoxybenzoic acid, and 50-80 parts of organic solvent are mixed and dried to obtain the filler. Through the above technical scheme, the problem of poor low temperature resistance and impact strength of PP-R pipe in aerogel insulation PP-R pipe in the related art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of polypropylene pipes, and in particular to a low-temperature resistant aerogel thermal insulation PP-R pipe and a preparation method thereof. Background Art

[0002] Aerogel insulated PP-R pipe consists of a PP-R (random copolymer polypropylene) pipe body and an outer aerogel insulation layer. It is widely used in conventional pipeline transportation such as building water supply and drainage, heating, etc. due to its advantages such as non-toxicity, strong chemical stability, easy processing and molding, and reasonable cost performance.

[0003] However, when the temperature drops to a lower range, the defects of the PP-R pipe in the aerogel insulated PP-R pipe begin to become increasingly prominent. The low temperature environment will cause the physical properties of the PP-R pipe to deteriorate, and the impact strength of the material will be greatly reduced, becoming brittle and hard. When the pipeline is installed and subjected to slight external force impacts (such as soil frost heave, construction collision, etc.), cracks and ruptures are very likely to occur, leading to medium leakage, causing safety hazards, and causing maintenance costs to rise. Therefore, due to the poor low-temperature resistance of the PP-R pipe body, the reliable use time and range of the aerogel insulated PP-R pipe in the low-temperature field are limited. Therefore, it is necessary to improve the low-temperature resistance of the PP-R pipe and broaden the application scenarios of the aerogel insulated PP-R pipe. Summary of the invention

[0004] The present invention provides a low-temperature resistant aerogel thermal insulation PP-R pipe and a preparation method thereof, which solves the problem of poor low-temperature resistance and impact strength of the PP-R pipe in the aerogel thermal insulation PP-R pipe in the related art.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a low-temperature resistant aerogel insulation PP-R pipe, which comprises a random copolymer polypropylene pipe layer and an aerogel insulation layer from the inside to the outside;

[0007] The raw materials of the random copolymer polypropylene tube layer include the following components in parts by weight: 100 parts of random copolymer polypropylene, 2-5 parts of maleic anhydride grafted polyethylene, 0.3-0.6 parts of nucleating agent, 5-10 parts of filler, and 1-1.5 parts of antioxidant;

[0008] The preparation method of the filler comprises the following steps: mixing 10 to 20 parts of an inorganic filler, 0.5 to 1 part of 2-methyl-3-acetoxybenzoic acid and 50 to 80 parts of an organic solvent, and drying to obtain the filler.

[0009] As a further technical solution, the nucleating agent includes a β-type nucleating agent.

[0010] As a further technical solution, the β-type nucleating agent includes one or both of the nucleating agent TMB-5 and the nucleating agent WBG-Ⅱ.

[0011] As a further technical solution, the antioxidant includes an amine antioxidant and a phosphite antioxidant in a mass ratio of 1:9 to 9:1.

[0012] As a further technical solution, the inorganic filler includes one or more of silicon dioxide, calcium carbonate, talc, and barium sulfate.

[0013] As a further technical solution, the particle size of the inorganic filler is 40-60 nm.

[0014] As a further technical solution, the model of the random copolymer polypropylene includes one or more of R200P-3702, RA140E, and K8224.

[0015] As a further technical solution, the preparation method of the filler includes the following steps: mixing 10 to 20 parts of an inorganic filler, 0.5 to 1 part of 2-methyl-3-acetoxybenzoic acid, and 50 to 80 parts of an organic solvent, drying, mixing with 0.5 to 1 part of mesaconic acid and 30 to 40 parts of water, and drying to obtain a filler.

[0016] In the present invention, the inorganic filler in the random copolymer polypropylene pipe layer raw material is first modified by 2-methyl-3-acetoxybenzoic acid and then modified by mesaconic acid, thereby further improving the low temperature resistance and impact strength of the PP-R pipe in the aerogel insulation PP-R pipe.

[0017] As a further technical solution, the mass ratio of the 2-methyl-3-acetoxybenzoic acid to the mesaconic acid is 1:0.7~0.8.

[0018] In the present invention, the inorganic filler in the raw material of the random copolymer polypropylene tube layer is first modified by 2-methyl-3-acetoxybenzoic acid and then modified by mesaconic acid, and the mass ratio of 2-methyl-3-acetoxybenzoic acid to mesaconic acid is 1:0.7-0.8, which further improves the low temperature resistance and impact strength of the PP-R pipe in the aerogel insulation PP-R pipe.

[0019] The present invention also proposes a method for preparing a low-temperature resistant aerogel insulation PP-R pipe, comprising the following steps:

[0020] S1, mixing the raw materials of the random copolymer polypropylene tube layer, and extruding and molding to obtain the random copolymer polypropylene tube layer;

[0021] S2. Attaching an aerogel insulation layer to the outside of the random copolymer polypropylene tube layer to obtain an aerogel insulation PP-R tube.

[0022] The working principle and beneficial effects of the present invention are:

[0023] In the present invention, the aerogel insulation PP-R pipe is provided with a random copolymer polypropylene pipe layer and an aerogel insulation layer in sequence from the inside to the outside. The random copolymer polypropylene pipe layer uses random copolymer polypropylene as a base material, and an inorganic filler modified by 2-methyl-3-acetoxybenzoic acid is added with the remaining components to prepare a random copolymer polypropylene pipe, which significantly improves the low temperature resistance and impact strength of the PP-R pipe in the aerogel insulation PP-R pipe. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the following examples and comparative examples, the model of maleic anhydride grafted polyethylene is GR-207, the particle size of silicon dioxide is 50 nm, the particle size of calcium carbonate is 40 nm, and the particle size of talc is 60 nm.

[0026] Example 1

[0027] The low-temperature resistant aerogel insulation PP-R pipe includes a random copolymer polypropylene pipe layer and an aerogel insulation layer from the inside to the outside;

[0028] The raw materials of the random copolymer polypropylene tube layer include the following components in parts by weight: 100 parts of random copolymer polypropylene R200P-3702, 2 parts of maleic anhydride grafted polyethylene, 0.3 parts of nucleating agent TMB-5, 5 parts of filler, 0.1 parts of antioxidant 168, and 0.9 parts of antioxidant 1098;

[0029] The preparation method of the filler comprises the following steps: mixing 5 parts of silicon dioxide, 5 parts of calcium carbonate, 0.5 parts of 2-methyl-3-acetoxybenzoic acid and 50 parts of methanol, and drying to obtain the filler;

[0030] The preparation method of low temperature resistant aerogel insulation PP-R pipe comprises the following steps:

[0031] S1, mixing the raw materials of the random copolymer polypropylene tube layer, and extruding and molding to obtain a random copolymer polypropylene tube;

[0032] S2. Attach an aerogel insulation layer to the outside of the random copolymer polypropylene tube to obtain an aerogel insulation PP-R tube.

[0033] Example 2

[0034] The low-temperature resistant aerogel insulation PP-R pipe includes a random copolymer polypropylene pipe layer and an aerogel insulation layer from the inside to the outside;

[0035] The raw materials of the random copolymer polypropylene tube layer include the following components in parts by weight: 100 parts of random copolymer polypropylene RA140E, 5 parts of maleic anhydride grafted polyethylene, 0.6 parts of nucleating agent TMB-5, 10 parts of filler, 1.35 parts of antioxidant 168, and 0.15 parts of antioxidant 1098;

[0036] The preparation method of the filler comprises the following steps: mixing 10 parts of silicon dioxide, 10 parts of talc, 1 part of 2-methyl-3-acetoxybenzoic acid and 80 parts of methanol, and drying to obtain the filler;

[0037] The preparation method of low temperature resistant aerogel insulation PP-R pipe comprises the following steps:

[0038] S1, mixing the raw materials of the random copolymer polypropylene tube layer, and extruding and molding to obtain a random copolymer polypropylene tube;

[0039] S2. Attach an aerogel insulation layer to the outside of the random copolymer polypropylene tube to obtain an aerogel insulation PP-R tube.

[0040] Example 3

[0041] The low-temperature resistant aerogel insulation PP-R pipe includes a random copolymer polypropylene pipe layer and an aerogel insulation layer from the inside to the outside;

[0042] The raw materials of the random copolymer polypropylene tube layer include the following components in parts by weight: 100 parts of random copolymer polypropylene R200P-3702, 4 parts of maleic anhydride grafted polyethylene, 0.5 parts of nucleating agent TMB-5, 8 parts of filler, 0.5 parts of antioxidant 168, and 0.5 parts of antioxidant 1098;

[0043] The preparation method of the filler comprises the following steps: mixing 16 parts of silicon dioxide, 1 part of 2-methyl-3-acetoxybenzoic acid and 60 parts of methanol, and drying to obtain the filler;

[0044] The preparation method of low temperature resistant aerogel insulation PP-R pipe comprises the following steps:

[0045] S1, mixing the raw materials of the random copolymer polypropylene tube layer, and extruding and molding to obtain a random copolymer polypropylene tube;

[0046] S2. Attach an aerogel insulation layer to the outside of the random copolymer polypropylene tube to obtain an aerogel insulation PP-R tube.

[0047] Example 4

[0048] The only difference between this embodiment and embodiment 3 is that the preparation method of the filler includes the following steps: 10 parts of silicon dioxide, 0.5 parts of 2-methyl-3-acetoxybenzoic acid, and 50 parts of methanol are mixed, dried, and mixed with 0.5 parts of mesaconic acid and 30 parts of water, and dried to obtain the filler.

[0049] Example 5

[0050] The only difference between this embodiment and embodiment 3 is that the preparation method of the filler includes the following steps: 20 parts of silicon dioxide, 1 part of 2-methyl-3-acetoxybenzoic acid, and 80 parts of methanol are mixed, dried, and mixed with 1 part of mesaconic acid and 40 parts of water, and dried to obtain a filler.

[0051] Example 6

[0052] The only difference between this embodiment and embodiment 3 is that the preparation method of the filler includes the following steps: 16 parts of silicon dioxide, 1 part of 2-methyl-3-acetoxybenzoic acid, and 60 parts of methanol are mixed, dried, and mixed with 1 part of mesaconic acid and 30 parts of water, and dried to obtain a filler.

[0053] Example 7

[0054] The only difference between this embodiment and embodiment 3 is that the preparation method of the filler includes the following steps: 16 parts of silicon dioxide, 1 part of 2-methyl-3-acetoxybenzoic acid, and 60 parts of methanol are mixed, dried, mixed with 0.5 parts of mesaconic acid and 30 parts of water, and dried to obtain the filler.

[0055] Example 8

[0056] The only difference between this embodiment and embodiment 3 is that the preparation method of the filler includes the following steps: 16 parts of silicon dioxide, 1 part of 2-methyl-3-acetoxybenzoic acid, and 60 parts of methanol are mixed, dried, and mixed with 0.7 parts of mesaconic acid and 30 parts of water, and dried to obtain a filler.

[0057] Example 9

[0058] The only difference between this embodiment and embodiment 3 is that the preparation method of the filler includes the following steps: 16 parts of silicon dioxide, 1 part of 2-methyl-3-acetoxybenzoic acid, and 60 parts of methanol are mixed, dried, and mixed with 0.8 parts of mesaconic acid and 30 parts of water, and dried to obtain the filler.

[0059] Comparative Example 1

[0060] The only difference between this comparative example and Example 3 is that the preparation method of the filler includes the following steps: 16 parts of silicon dioxide and 1 part of 2-methyl-3-acetoxybenzoic acid are mixed to obtain a filler.

[0061] Comparative Example 2

[0062] The only difference between this comparative example and Example 3 is that the raw materials of the random copolymer polypropylene tube layer include the following components in parts by weight: 100 parts of random copolymer polypropylene R200P-3702, 4 parts of maleic anhydride grafted polyethylene, 0.5 parts of nucleating agent TMB-5, 8 parts of silica, 0.5 parts of antioxidant 168, and 0.5 parts of antioxidant 1098.

[0063] Comparative Example 3

[0064] The difference between this comparative example and Example 3 is only that 2-methyl-3-acetoxybenzoic acid is replaced by p-nitrobenzoic acid.

[0065] Impact strength and low temperature resistance test: According to the standard GB / T 1043.1-2008 "Determination of impact properties of plastics - Part 1: Non-instrumented impact test", the random copolymer polypropylene tubes prepared in Examples 1 to 9 and Comparative Examples 1 to 3 were respectively subjected to the notched impact strength test. Each sample was subjected to 5 experiments in parallel, and the results were averaged (one decimal place was retained). The test temperatures were 0°C and -20°C, respectively, and the notch type was A-type notch. The change rate of notched impact strength was calculated (the result was retained to two decimal places). The change rate of notched impact strength = [(notched impact strength at 0°C - notched impact strength at 20°C) / notched impact strength at 0°C] × 100%. The results are shown in Table 1 below.

[0066] Table 1 Performance test results

[0067]

[0068] Compared with Comparative Examples 1 to 3, the random copolymer polypropylene pipes prepared in Examples 1 to 9 have higher simply supported beam notched impact strength at 0°C and -20°C and lower simply supported beam notched impact strength change rate, indicating that the random copolymer polypropylene pipe layer is based on random copolymer polypropylene, and the inorganic filler modified with 2-methyl-3-acetoxybenzoic acid is added to the remaining components to prepare the random copolymer polypropylene pipe, which significantly improves the low temperature resistance and impact strength of the PP-R pipe in the aerogel insulation PP-R pipe.

[0069] Compared with Example 3, the random copolymer polypropylene pipes prepared in Examples 4 to 9 have higher simply supported beam notched impact strength at 0°C and -20°C and lower simply supported beam notched impact strength change rate, indicating that the inorganic filler of the random copolymer polypropylene pipe layer is first modified with 2-methyl-3-acetoxybenzoic acid and then modified with mesaconic acid, which further improves the low temperature resistance and impact strength of the PP-R pipe in the aerogel insulation PP-R pipe.

[0070] Compared with Examples 6 and 7, the random copolymer polypropylene tubes prepared in Examples 8 and 9 have higher simply supported beam notched impact strength at 0°C and -20°C and lower simply supported beam notched impact strength change rate, indicating that the inorganic filler of the random copolymer polypropylene tube layer is first modified with 2-methyl-3-acetoxybenzoic acid and then modified with mesaconic acid, and the mass ratio of 2-methyl-3-acetoxybenzoic acid to mesaconic acid is 1:0.7-0.8, which further improves the low temperature resistance and impact strength of the PP-R pipe in the aerogel insulation PP-R pipe.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low temperature resistant aerogel insulation PP-R pipe, characterized in that: From the inside to the outside, it includes a random copolymer polypropylene tube layer and an aerogel insulation layer; The raw materials of the random copolymer polypropylene tube layer include the following components in parts by weight: 100 parts of random copolymer polypropylene, 2-5 parts of maleic anhydride grafted polyethylene, 0.3-0.6 parts of nucleating agent, 5-10 parts of filler, and 1-1.5 parts of antioxidant; The preparation method of the filler comprises the following steps: mixing 10 to 20 parts of an inorganic filler, 0.5 to 1 part of 2-methyl-3-acetoxybenzoic acid, and 50 to 80 parts of an organic solvent, and drying to obtain a filler; The inorganic filler includes one or more of silicon dioxide, calcium carbonate, talc, and barium sulfate; The organic solvent is methanol.

2. The low-temperature resistant aerogel insulation PP-R pipe according to claim 1, characterized in that: The nucleating agent includes a β-type nucleating agent.

3. The low-temperature resistant aerogel insulation PP-R pipe according to claim 2, characterized in that: The β-type nucleating agent includes one or both of nucleating agent TMB-5 and nucleating agent WBG-Ⅱ.

4. The low-temperature resistant aerogel insulation PP-R pipe according to claim 1, characterized in that: The antioxidant comprises an amine antioxidant and a phosphite antioxidant in a mass ratio of 1:9 to 9:

1.

5. The low-temperature resistant aerogel insulation PP-R pipe according to claim 1, characterized in that: The particle size of the inorganic filler is 40-60 nm.

6. The low-temperature resistant aerogel insulation PP-R pipe according to claim 1, characterized in that: The random copolymer polypropylene may have one or more types of R200P-3702, RA140E, and K8224.

7. The low-temperature resistant aerogel insulation PP-R pipe according to claim 1, characterized in that: The preparation method of the filler comprises the following steps: mixing 10-20 parts of inorganic filler, 0.5-1 parts of 2-methyl-3-acetoxybenzoic acid and 50-80 parts of organic solvent, drying, mixing with 0.5-1 parts of mesaconic acid and 30-40 parts of water, drying to obtain the filler.

8. The low-temperature resistant aerogel insulation PP-R pipe according to claim 7, characterized in that: The mass ratio of the 2-methyl-3-acetoxybenzoic acid to the mesaconic acid is 1:0.7-0.

8.

9. The method for preparing a low-temperature resistant aerogel insulation PP-R pipe according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, mixing the raw materials of the random copolymer polypropylene tube layer, and extruding and molding to obtain the random copolymer polypropylene tube layer; S2. Attaching an aerogel insulation layer to the outside of the random copolymer polypropylene tube layer to obtain an aerogel insulation PP-R tube.

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