A kind of anticorrosion pipeline and its production process

Abstract

The invention relates to the technical field of anti-corrosion pipelines, and proposes an anti-corrosion pipeline and a production process thereof. An anti-corrosion pipeline comprises a pipeline body and a non-metallic anti-corrosion layer arranged on the surface of the pipeline body; the raw materials of the non-metallic anti-corrosion layer include the following components by mass: 25-40 parts of fluororesin, 5-20 parts of epoxy resin, 2-8 parts of polyimide resin, 3-10 parts of phenolic resin, 4-7 parts of bismaleimide resin, 5-8 parts of silicone resin, 2-4 parts of cyanate resin, 10-20 parts of polyphenylene ether, 15-25 parts of anti-corrosion filler, 5-10 parts of compatibilizer, and 1-5 parts of curing agent; the anti-corrosion filler includes scaly sericite and tetrapod-shaped zinc oxide whiskers. Through the above technical scheme, the problem of poor anti-corrosion effect of anti-corrosion pipelines in related technologies is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-corrosion pipelines, and in particular to an anti-corrosion pipeline and a production process thereof. Background Art

[0002] The biggest weakness of steel pipes is their poor corrosion resistance, which greatly limits their application. With the development of technology and continuous innovation, anti-corrosion pipelines have emerged. Anti-corrosion pipelines can effectively prevent metal corrosion from transported products, industrial atmosphere, water and soil. At present, there are many methods for pipeline anti-corrosion. The most commonly used method is to coat the surface of the pipeline with a non-metallic anti-corrosion layer to achieve the purpose of corrosion resistance.

[0003] The two most important points in selecting a non-metallic anti-corrosion layer are: ① The non-metallic anti-corrosion layer itself has good corrosion resistance. After being applied to the coated pipe, the pipe can achieve better anti-corrosion effect; ② The material of the non-metallic anti-corrosion layer must be compatible with the coated pipe so that there is good bonding between the two to better exert the anti-corrosion effect.

[0004] However, the corrosion resistance of the existing non-metallic anti-corrosion layer of the anti-corrosion pipeline is not ideal, and the anti-corrosion effect of the anti-corrosion pipeline needs to be further improved. Summary of the invention

[0005] The present invention provides an anti-corrosion pipeline and a production process thereof, which solves the problem of poor anti-corrosion effect of the anti-corrosion pipeline in the related art.

[0006] The technical solution of the present invention is as follows:

[0007] An anti-corrosion pipeline comprises a pipeline body and a non-metallic anti-corrosion layer arranged on the surface of the pipeline body;

[0008] The raw materials of the non-metallic anticorrosion layer include the following components in parts by weight: 25-40 parts of fluororesin, 5-20 parts of epoxy resin, 2-8 parts of polyimide resin, 3-10 parts of phenolic resin, 4-7 parts of bismaleimide resin, 5-8 parts of silicone resin, 2-4 parts of cyanate resin, 10-20 parts of polyphenylene ether, 15-25 parts of anticorrosive filler, 5-10 parts of compatibilizer, and 1-5 parts of curing agent;

[0009] The anticorrosive filler comprises scaly sericite and tetrapod-shaped zinc oxide whiskers.

[0010] As a further technical solution, the compatibilizer includes one or two of styrene grafted maleic anhydride and polyphenylene ether grafted maleic anhydride.

[0011] As a further technical solution, the curing agent is a polyamide curing agent.

[0012] As a further technical solution, the mass of the scaly sericite is greater than the mass of the tetrapod-shaped zinc oxide whiskers.

[0013] The quality of the flaky sericite in the present invention is greater than the quality of the tetrapod-shaped zinc oxide whiskers, which further improves the anti-corrosion effect of the anti-corrosion pipeline.

[0014] As a further technical solution, the mass ratio of the scaly sericite to the tetrapod-shaped zinc oxide whiskers is 3.5:1.5-4:1.

[0015] The present invention limits the mass ratio of scaly sericite to tetrapod-shaped zinc oxide whiskers to 3.5:1.5-4:1, thereby further improving the anti-corrosion effect of the anti-corrosion pipeline.

[0016] As a further technical solution, the flaky sericite is modified flaky sericite, the tetrapod-shaped zinc oxide whisker is modified tetrapod-shaped zinc oxide whisker, and the modifiers in the modified flaky sericite and modified tetrapod-shaped zinc oxide whisker each independently include siloxane or a hydroxyl-containing substance.

[0017] The present invention defines the flaky sericite as modified flaky sericite, the tetrapod-shaped zinc oxide whisker as modified tetrapod-shaped zinc oxide whisker, and the modifiers in the modified flaky sericite and the modified tetrapod-shaped zinc oxide whisker each independently include siloxane or a hydroxyl-containing substance, thereby further improving the anti-corrosion effect of the anti-corrosion pipeline.

[0018] As a further technical solution, the hydroxyl-containing substance includes a hydroxyl-containing compound or a hydroxyl-containing polymer.

[0019] The hydroxyl-containing polymer in the present invention can be any polymer containing hydroxyl groups, for example, it can be one or more of polyvinyl alcohol, polyethylene glycol, allyl polyethylene glycol, ethylene-vinyl alcohol copolymer, styrene-propylene alcohol copolymer resin, and polylactic acid, preferably polyvinyl alcohol.

[0020] As a further technical solution, the flaky sericite is fluorine-containing silicone-modified flaky sericite, and the tetrapod-shaped zinc oxide whiskers are tetrapod-shaped zinc oxide whiskers modified by hydroxyl-containing substances.

[0021] In the present invention, the flaky sericite is defined as fluorinated silicone-modified flaky sericite, and the tetrapod-shaped zinc oxide whisker is a hydroxyl-containing substance-modified tetrapod-shaped zinc oxide whisker, which further improves the anti-corrosion effect of the anti-corrosion pipeline.

[0022] As a further technical solution, the four-needle zinc oxide whisker is a four-needle zinc oxide whisker modified by a hydroxyl-containing compound.

[0023] In the present invention, the four-needle zinc oxide whisker is defined as a four-needle zinc oxide whisker modified by a hydroxyl compound, which further improves the anti-corrosion effect of the anti-corrosion pipeline.

[0024] As a further technical solution, the raw materials of the fluorinated silicone modified flaky sericite include flaky sericite and fluorinated silicone in a mass ratio of 1:0.05-0.15, and the raw materials of the hydroxyl-containing compound modified tetrapod-shaped zinc oxide whiskers include tetrapod-shaped zinc oxide whiskers and hydroxyl-containing compounds in a mass ratio of 1:0.1-0.5.

[0025] The fluorine-containing siloxane in the present invention can be any siloxane containing fluorine atoms, for example, it can be one or more of trifluoropropane trimethoxysilane, monofluorotriethoxysilane, dimethoxymethyl (3,3,3-trifluoropropyl) silicon, trifluoropropyl triethoxysilane, preferably trifluoropropane trimethoxysilane.

[0026] The hydroxyl-containing compound in the present invention can be any compound containing a hydroxyl group, for example, it can be one or more of 2-methyl-2-propyl-1,3-propanediol, L-fucitol, methylpropanediol, 3,4-dihydroxyphenylethanol, preferably 2-methyl-2-propyl-1,3-propanediol.

[0027] As a further technical solution, the preparation method of the fluorinated silicone modified flaky sericite comprises the following steps: after mixing the flaky sericite with water, adding the fluorinated silicone, performing a first modification, and drying to obtain the fluorinated silicone modified flaky sericite; the preparation method of the hydroxyl compound modified tetrapod-shaped zinc oxide whisker comprises the following steps: after mixing the hydroxyl compound with a solvent, adding the tetrapod-shaped zinc oxide whisker, performing a second modification, and drying to obtain the hydroxyl compound modified tetrapod-shaped zinc oxide whisker.

[0028] As a further technical solution, the temperature of the first modification is 50-60°C, and the temperature of the second modification is 30-50°C.

[0029] The present invention also proposes a production process for an anti-corrosion pipeline, comprising the following steps:

[0030] S1, melt-mixing fluororesin, epoxy resin, polyimide resin, phenolic resin, bismaleimide resin, silicone resin and cyanate resin to obtain a mixed resin;

[0031] S2, melting and mixing the polyphenylene ether, anticorrosive filler, compatibilizer and curing agent to obtain a mixed material;

[0032] S3, melt-extrude the mixed resin and the mixed material, and crush them to obtain granular material;

[0033] S4, placing the granular material on the surface of the pipeline body, melting it, cooling it, and obtaining an anti-corrosion pipeline.

[0034] The working principle and beneficial effects of the present invention are:

[0035] The present invention provides an anti-corrosion pipeline, comprising a pipeline body and a non-metallic anti-corrosion layer arranged on the surface of the pipeline body. The flaky sericite and the four-needle zinc oxide whiskers in the non-metallic anti-corrosion layer are used in combination, and the two synergistically improve the anti-corrosion effect of the anti-corrosion pipeline. DETAILED DESCRIPTION

[0036] 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.

[0037] The raw material parameters in the following examples and comparative examples are as follows:

[0038] Fluororesin is FEP perfluororesin FJP-820;

[0039] The epoxy resin is epoxy resin NPCN-704;

[0040] The polyimide resin is polyimide resin ZS07;

[0041] The phenolic resin is phenolic resin 2123;

[0042] The bismaleimide resin is bismaleimide resin SK-0310, with a content of ≥80%, purchased from Changzhou Shangke New Materials Co., Ltd.;

[0043] The silicone resin is silicone resin HT-608;

[0044] The cyanate ester resin was phenolic cyanate ester PT-30, purchased from Lonza Company;

[0045] The polyphenylene ether is PPO 540Z;

[0046] The particle size of scaly sericite is 100 mesh;

[0047] The length of the four-needle ZnO whiskers is 3~200μm and the root diameter is 0.5~14μm;

[0048] The polyphenylene ether grafted maleic anhydride was PPO-g-MAH SH820, purchased from Shuanghao Plastic Raw Materials Business Department, Zhangmutou, Dongguan City;

[0049] Styrene grafted maleic anhydride is SMA-1000P;

[0050] The amine value of polyamide curing agent 650 is 300±20mgKOH / g, and the viscosity is 15000~30000mpa·s;

[0051] Polyvinyl alcohol is PVA 2488;

[0052] The particle size of nano zinc oxide powder is 30nm.

[0053] Example 1

[0054] S1, melt and mix 32 parts of fluororesin, 13 parts of epoxy resin, 4 parts of polyimide resin, 5 parts of phenolic resin, 5 parts of bismaleimide resin, 7 parts of silicone resin and 3 parts of cyanate resin to obtain a mixed resin;

[0055] S2, melt-mix 15 parts of polyphenylene ether, 6 parts of flaky sericite, 14 parts of tetrapod-shaped zinc oxide whiskers, 7 parts of polyphenylene ether grafted maleic anhydride, and 3 parts of polyamide curing agent 650 to obtain a mixed material;

[0056] S3, transferring the mixed resin and mixed material to a twin-screw extruder for melt extrusion, and crushing to 300 meshes with a pulverizer to obtain granular material;

[0057] S4. Place the above-mentioned granular material on the inner wall surface of the pipeline body to melt, cool, and obtain an anti-corrosion pipeline with a non-metallic anti-corrosion layer thickness of 3 mm.

[0058] Example 2

[0059] S1, melt and mix 25 parts of fluororesin, 5 parts of epoxy resin, 2 parts of polyimide resin, 3 parts of phenolic resin, 4 parts of bismaleimide resin, 5 parts of silicone resin and 2 parts of cyanate resin to obtain a mixed resin;

[0060] S2, melt-mixing 10 parts of polyphenylene ether, 4 parts of flaky sericite, 11 parts of tetrapod-shaped zinc oxide whiskers, 5 parts of polyphenylene ether grafted maleic anhydride, and 1 part of polyamide curing agent 650 to obtain a mixed material;

[0061] S3, transferring the mixed resin and mixed material to a twin-screw extruder for melt extrusion, and crushing to 150 meshes by a pulverizer to obtain granular material;

[0062] S4. Place the above-mentioned granular material on the inner wall surface of the pipeline body to melt, cool, and obtain an anti-corrosion pipeline with a non-metallic anti-corrosion layer thickness of 3 mm.

[0063] Example 3

[0064] S1, melt and mix 40 parts of fluororesin, 20 parts of epoxy resin, 8 parts of polyimide resin, 10 parts of phenolic resin, 7 parts of bismaleimide resin, 8 parts of silicone resin and 4 parts of cyanate resin to obtain a mixed resin;

[0065] S2, melt-mix 20 parts of polyphenylene ether, 7 parts of flaky sericite, 18 parts of tetrapod-shaped zinc oxide whiskers, 10 parts of styrene-grafted maleic anhydride, and 5 parts of polyamide curing agent 650 to obtain a mixed material;

[0066] S3, transferring the mixed resin and mixed material to a twin-screw extruder for melt extrusion, and crushing to 300 meshes with a pulverizer to obtain granular material;

[0067] S4. Place the above-mentioned granular material on the inner wall surface of the pipeline body to melt, cool, and obtain an anti-corrosion pipeline with a non-metallic anti-corrosion layer thickness of 3 mm.

[0068] Example 4

[0069] The only difference from Example 1 is that: 10 parts of flaky sericite and 10 parts of tetrapod-shaped zinc oxide whiskers.

[0070] Example 5

[0071] The only difference from Example 1 is that: 12 parts of flaky sericite and 8 parts of tetrapod-shaped zinc oxide whiskers.

[0072] Example 6

[0073] The only difference from Example 1 is that: 14 parts of flaky sericite and 6 parts of tetrapod-shaped zinc oxide whiskers.

[0074] Example 7

[0075] The only difference from Example 1 is that: 16 parts of flaky sericite and 4 parts of tetrapod-shaped zinc oxide whiskers.

[0076] Example 8

[0077] The only difference from Example 1 is that: 18 parts of flaky sericite and 2 parts of tetrapod-shaped zinc oxide whiskers.

[0078] Example 9

[0079] The only difference from Example 6 is that the flaky sericite is fluorinated siloxane-modified flaky sericite, and the preparation method is as follows: 20 g of flaky sericite and 200 g of water are evenly mixed, and 2 g of trifluoropropane trimethoxysilane is added, stirred at 55° C. for 2 h, filtered, and dried to obtain fluorinated siloxane-modified flaky sericite;

[0080] The tetrapod-shaped zinc oxide whisker is a fluorinated siloxane-modified tetrapod-shaped zinc oxide whisker, and the preparation method is as follows: after evenly mixing 20 g of the tetrapod-shaped zinc oxide whisker and 200 g of water, 2 g of trifluoropropane trimethoxysilane is added, stirred at 55° C. for 2 h, filtered, and dried to obtain the fluorinated siloxane-modified tetrapod-shaped zinc oxide whisker.

[0081] Example 10

[0082] The only difference from Example 6 is that the flaky sericite is a flaky sericite modified by a hydroxyl-containing substance, and the preparation method is as follows: 2 g of polyvinyl alcohol and 200 g of water are evenly mixed, and then 20 g of flaky sericite is added, stirred at 40° C. for 1 h, filtered, and dried to obtain a flaky sericite modified by a hydroxyl-containing substance;

[0083] The tetrapod-shaped zinc oxide whisker is a tetrapod-shaped zinc oxide whisker modified by a hydroxyl-containing substance, and the preparation method is as follows: after evenly mixing 2 g of polyvinyl alcohol and 200 g of water, 20 g of tetrapod-shaped zinc oxide whisker is added, stirred at 40° C. for 1 hour, filtered, and dried to obtain the tetrapod-shaped zinc oxide whisker modified by a hydroxyl-containing substance.

[0084] Embodiment 11

[0085] The only difference from Example 6 is that the flaky sericite is fluorinated siloxane-modified flaky sericite, and the preparation method is as follows: 20 g of flaky sericite and 200 g of water are evenly mixed, and 2 g of trifluoropropane trimethoxysilane is added, stirred at 55° C. for 2 h, filtered, and dried to obtain fluorinated siloxane-modified flaky sericite;

[0086] The tetrapod-shaped zinc oxide whisker is a tetrapod-shaped zinc oxide whisker modified by a hydroxyl-containing substance, and the preparation method is as follows: after evenly mixing 2 g of polyvinyl alcohol and 200 g of water, 20 g of tetrapod-shaped zinc oxide whisker is added, stirred at 40° C. for 1 hour, filtered, and dried to obtain the tetrapod-shaped zinc oxide whisker modified by a hydroxyl-containing substance.

[0087] Example 12

[0088] The only difference from Example 6 is that the flaky sericite is a flaky sericite modified by a hydroxyl-containing substance, and the preparation method is as follows: 2 g of polyvinyl alcohol and 200 g of water are evenly mixed, and then 20 g of flaky sericite is added, stirred at 40° C. for 1 h, filtered, and dried to obtain a flaky sericite modified by a hydroxyl-containing substance;

[0089] The tetrapod-shaped zinc oxide whisker is a fluorinated siloxane-modified tetrapod-shaped zinc oxide whisker, and the preparation method is as follows: after evenly mixing 20 g of the tetrapod-shaped zinc oxide whisker and 200 g of water, 2 g of trifluoropropane trimethoxysilane is added, stirred at 55° C. for 2 h, filtered, and dried to obtain the fluorinated siloxane-modified tetrapod-shaped zinc oxide whisker.

[0090] Example 13

[0091] The only difference from Example 11 is that trifluoropropanetrimethoxysilane is replaced by an equal amount of KH-570.

[0092] Embodiment 14

[0093] The only difference from Example 11 is that polyvinyl alcohol is replaced by an equal amount of 2-methyl-2-propyl-1,3-propanediol.

[0094] Comparative Example 1

[0095] The only difference from Example 1 is that the flaky sericite is replaced by an equal amount of tetrapod-shaped zinc oxide whiskers.

[0096] Comparative Example 2

[0097] The only difference from Example 1 is that the tetrapod-shaped zinc oxide whiskers are replaced by an equal amount of flaky sericite.

[0098] Comparative Example 3

[0099] The only difference from Example 1 is that the four-needle zinc oxide whiskers are replaced by an equal amount of nano zinc oxide powder.

[0100] The anti-corrosion pipes obtained in Examples 1 to 14 and Comparative Examples 1 to 3 were subjected to corrosion resistance tests:

[0101] (1) Acid resistance: Immerse the anti-corrosion pipe in a 5wt% sulfuric acid solution, record the time it takes for the non-metallic anti-corrosion layer to be completely corroded, and take the average value of 5 times as the final result;

[0102] (2) Alkali resistance: Immerse the anti-corrosion pipe in 10wt% NaOH solution, record the time it takes for the non-metallic anti-corrosion layer to be completely corroded, and take the average value of 5 times as the final result;

[0103] The results are recorded in Table 1.

[0104] Table 1 Corrosion resistance of anti-corrosion pipelines

[0105]

[0106] It can be seen from Table 1 that the present invention provides an anti-corrosion pipeline with an acid resistance of more than 2503h and an alkali resistance of more than 2685h, and has good corrosion resistance.

[0107] Compared with Comparative Examples 1 to 3, Example 1 adds flaky sericite and tetrapod-shaped zinc oxide whiskers, and the acid and alkali resistance of the anti-corrosion pipe obtained in Example 1 is better than those in Comparative Examples 1 to 3, indicating that the flaky sericite and tetrapod-shaped zinc oxide whiskers are used in combination in the non-metallic anti-corrosion layer, and the two synergistically improve the anti-corrosion effect of the anti-corrosion pipe.

[0108] The acid resistance and alkali resistance of the anticorrosive pipes obtained in Examples 5 to 8 are better than those in Example 1 and Example 4, indicating that the quality of the flaky sericite is greater than the quality of the tetrapod-shaped zinc oxide whiskers, further improving the anticorrosive effect of the anticorrosive pipes.

[0109] The acid resistance and alkali resistance of the anti-corrosion pipes obtained in Examples 6 and 7 are better than those in Examples 5 and 8, indicating that the mass ratio of flaky sericite to tetrapod-shaped zinc oxide whiskers is 3.5:1.5-4:1, which further improves the anti-corrosion effect of the anti-corrosion pipes.

[0110] The acid resistance and alkali resistance of the anti-corrosion pipes obtained in Examples 9 to 13 are better than those in Example 6, indicating that the anti-corrosion effect of the anti-corrosion pipes is further improved when the scaly sericite and the tetrapod-shaped zinc oxide whiskers are modified by siloxane or hydroxyl-containing substances.

[0111] The acid resistance and alkali resistance of the anti-corrosion pipes obtained in Examples 11 and 14 are better than those in Examples 9-10 and 12-13, indicating that the flaky sericite is flaky sericite modified by fluorinated silicone, and the tetrapod-shaped zinc oxide whiskers are tetrapod-shaped zinc oxide whiskers modified by hydroxyl-containing substances, which further improves the anti-corrosion effect of the anti-corrosion pipes.

[0112] The acid resistance and alkali resistance of the anti-corrosion pipeline obtained in Example 14 are better than those in Example 11, indicating that the four-needle zinc oxide whiskers are four-needle zinc oxide whiskers modified by hydroxyl compounds, which further improves the anti-corrosion effect of the anti-corrosion pipeline.

[0113] 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. An anti-corrosion pipeline, characterized in that: It includes a pipeline body and a non-metallic anti-corrosion layer arranged on the surface of the pipeline body; The raw materials of the non-metallic anticorrosion layer include the following components in parts by weight: 25-40 parts of fluororesin, 5-20 parts of epoxy resin, 2-8 parts of polyimide resin, 3-10 parts of phenolic resin, 4-7 parts of bismaleimide resin, 5-8 parts of silicone resin, 2-4 parts of cyanate resin, 10-20 parts of polyphenylene ether, 15-25 parts of anticorrosive filler, 5-10 parts of compatibilizer, and 1-5 parts of curing agent; The anticorrosive filler includes scaly sericite and tetrapod-shaped zinc oxide whiskers; The mass of the scaly sericite is greater than the mass of the tetrapod-shaped zinc oxide whiskers; The flaky sericite is fluorine-containing silicone-modified flaky sericite, and the tetrapod-shaped zinc oxide whisker is hydroxyl-containing compound-modified tetrapod-shaped zinc oxide whisker.

2. The anti-corrosion pipeline according to claim 1, characterized in that: The mass ratio of the scaly sericite to the tetrapod-shaped zinc oxide whiskers is 3.5:1.5-4:

1.

3. The anti-corrosion pipeline according to claim 1, characterized in that: The raw materials of the fluorine-containing silicone modified flaky sericite include flaky sericite and fluorine-containing silicone in a mass ratio of 1:0.05-0.15, and the raw materials of the hydroxyl-containing compound modified tetrapod-shaped zinc oxide whisker include tetrapod-shaped zinc oxide whisker and hydroxyl-containing compound in a mass ratio of 1:0.1-0.

5.

4. The anti-corrosion pipeline according to claim 3, characterized in that: The preparation method of the fluorine-containing silicone modified flaky sericite comprises the following steps: mixing the flaky sericite with water, adding the fluorine-containing silicone, performing a first modification, and drying to obtain the fluorine-containing silicone modified flaky sericite; the preparation method of the hydroxyl-containing compound modified tetrapod-shaped zinc oxide whisker comprises the following steps: mixing the hydroxyl-containing compound with a solvent, adding the tetrapod-shaped zinc oxide whisker, performing a second modification, and drying to obtain the hydroxyl-containing compound modified tetrapod-shaped zinc oxide whisker.

5. The anti-corrosion pipeline according to claim 4, characterized in that: The temperature of the first modification is 50-60°C, and the temperature of the second modification is 30-50°C.

6. A production process for anti-corrosion pipelines according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, melt-mixing fluororesin, epoxy resin, polyimide resin, phenolic resin, bismaleimide resin, silicone resin and cyanate resin to obtain a mixed resin; S2, melting and mixing the polyphenylene ether, anticorrosive filler, compatibilizer and curing agent to obtain a mixed material; S3, melt-extrude the mixed resin and the mixed material, and crush them to obtain granular material; S4, placing the granular material on the surface of the pipeline body, melting it, cooling it, and obtaining an anti-corrosion pipeline.

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