Steel skeleton plastic composite pipe for coked ammonium sulfate and preparation method of steel skeleton plastic composite pipe

Abstract

The invention relates to a coked ammonium sulfate steel skeleton plastic composite pipe and a preparation method thereof, and relates to the technical field of pipes, the coked ammonium sulfate steel skeleton plastic composite pipe comprises a pipe body, and the inner surface of the pipe body is sequentially provided with a steel skeleton layer, a modified polyphenylene sulfide layer, a first polyolefin layer and a second polyolefin layer. According to the coked ammonium sulfate steel skeleton plastic composite pipe, through the arrangement of the steel skeleton layer, the modified polyphenylene sulfide layer, the first polyolefin layer and the second polyolefin layer, the comprehensive performance such as corrosion resistance, penetration resistance and wear resistance of the coked ammonium sulfate steel skeleton plastic composite pipe is remarkably improved, the use requirements of a coked ammonium sulfate production process can be met, and the defects in the prior art are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of pipes, and in particular to a steel skeleton plastic composite pipe for coking ammonium sulfate and a preparation method thereof. Background Art

[0002] In the coking ammonium sulfate production process, the stability and corrosion resistance of the pipeline system are crucial to the overall production efficiency and product quality. Traditionally, such pipelines are mostly made of stainless steel. Although stainless steel has a certain degree of corrosion resistance, it still faces many challenges when handling the highly acidic ammonium sulfate mother liquor. Since the ammonium sulfate mother liquor contains high concentrations of corrosive media such as ammonium sulfate and ammonia, stainless steel pipelines are prone to weld corrosion and frequent leaks during long-term operation, which not only increases maintenance costs, but also seriously affects the safety and continuity of production.

[0003] Specifically, the corrosion problems of stainless steel pipelines in the ammonium sulfate production environment mainly come from the following aspects: first, the material itself has limited corrosion resistance to specific media, especially when the medium composition is complex and the concentration is high; second, the selection and matching of welding process and welding rod material are improper, resulting in the weld becoming a weak point for corrosion; third, the crystals in the ammonium sulfate mother liquor scour the inner wall of the pipeline, further accelerating the corrosion process. These problems not only lead to mother liquor leakage and production shutdown, but also increase acid consumption, seriously affecting production efficiency and product quality.

[0004] At present, there are still some shortcomings in the steel skeleton plastic composite pipe and its preparation method on the market, such as the plastic coating is not firmly combined with the steel pipe, the coating is uneven, and the production process is complicated. These problems limit the wide application of steel skeleton plastic composite pipe in the field of transporting highly corrosive media such as coking ammonium sulfate. Therefore, the development of a steel skeleton plastic composite pipe suitable for the coking ammonium sulfate production environment and its preparation method is of great significance for improving production safety, reducing maintenance costs, and improving product quality. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a plastic composite pipe with steel skeleton for coking ammonium sulfate and a preparation method thereof.

[0006] In a first aspect, the present invention provides a coked ammonium sulfate steel skeleton plastic composite pipe, the coked ammonium sulfate steel skeleton plastic composite pipe comprises a pipe body, the inner surface of the pipe body is sequentially provided with a steel skeleton layer, a modified polyphenylene sulfide layer, a first polyolefin layer and a second polyolefin layer;

[0007] The modified polyphenylene sulfide layer comprises raw materials including polyphenylene sulfide and non-metallic glass flakes;

[0008] The raw materials of the first polyolefin layer include polyethylene and polypropylene;

[0009] The raw materials of the second polyolefin layer include polyolefin and carbon black.

[0010] Furthermore, in the modified polyphenylene sulfide layer, the weight ratio of the polyphenylene sulfide to the non-metallic glass flakes is 2:1.

[0011] Furthermore, in the first polyolefin layer, the weight ratio of the polyethylene to the polypropylene is (1-2):(1-2).

[0012] Furthermore, in the second polyolefin layer, the weight ratio of the polyolefin to the carbon black is 100:1.

[0013] Furthermore, the thickness of the steel skeleton layer is 2-3 mm, and the thickness of the modified polyphenylene sulfide layer is 1-2 mm.

[0014] Furthermore, the thickness of the first polyolefin layer is 1.5-2.5 mm, and the thickness of the second polyolefin layer is 1-2 mm.

[0015] In a second aspect, the present invention provides a method for preparing the coking ammonium sulfate steel skeleton plastic composite pipe according to any one of the first aspects, the preparation method comprising the following steps:

[0016] Step (1): pre-treating the pipe body, and then welding steel wire inside the pipe body to form a steel skeleton layer;

[0017] Step (2): performing welding point process on the steel skeleton layer to obtain the coked ammonium sulfate steel skeleton plastic composite pipe.

[0018] Furthermore, the pretreatment includes rust removal.

[0019] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0020] An embodiment of the present invention provides a steel skeleton plastic composite pipe for coking ammonium sulfate and a preparation method thereof. The coking ammonium sulfate steel skeleton plastic composite pipe provided by the present invention significantly improves its comprehensive properties such as corrosion resistance, penetration resistance and wear resistance through the arrangement of a steel skeleton layer, a modified polyphenylene sulfide layer, a first polyolefin layer and a second polyolefin layer. It can meet the use requirements of the coking ammonium sulfate production process and make up for the shortcomings of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 A schematic flow chart of a method for preparing a coking ammonium sulfate steel skeleton plastic composite pipe provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0026] In a first aspect, the present invention provides a coked ammonium sulfate steel skeleton plastic composite pipe, the coked ammonium sulfate steel skeleton plastic composite pipe comprises a pipe body, the inner surface of the pipe body is sequentially provided with a steel skeleton layer, a modified polyphenylene sulfide layer, a first polyolefin layer and a second polyolefin layer;

[0027] The modified polyphenylene sulfide layer comprises raw materials including polyphenylene sulfide and non-metallic glass flakes;

[0028] The raw materials of the first polyolefin layer include polyethylene and polypropylene;

[0029] The raw materials of the second polyolefin layer include polyolefin and carbon black.

[0030] An embodiment of the present invention provides a coked ammonium sulfate steel skeleton plastic composite pipe. The coked ammonium sulfate steel skeleton plastic composite pipe provided by the present invention significantly improves its comprehensive performance such as corrosion resistance, penetration resistance and wear resistance through the arrangement of a steel skeleton layer, a modified polyphenylene sulfide layer, a first polyolefin layer and a second polyolefin layer. It can meet the use requirements of the coked ammonium sulfate production process and make up for the shortcomings of the prior art.

[0031] In the present invention, the first polyolefin layer is a common polyolefin layer, and the second polyolefin layer is a high-end polyolefin layer; among them, the common polyolefin is mainly polyethylene and polypropylene on the market; and the high-end polyolefin is the received polypropylene and ethylene-vinyl alcohol copolymer with high technical content, high application performance, high rigidity and high impact resistance. It mainly solves the problem of surface erosion resistance, small friction coefficient, and preventing ammonium sulfate crystal particles from scaling and blocking the pipeline and increasing resistance.

[0032] In some specific embodiments, the weight ratio of the polyphenylene sulfide to the non-metallic glass flakes in the modified polyphenylene sulfide layer is 2:1.

[0033] In some specific embodiments, the weight ratio of the polyethylene to the polypropylene in the first polyolefin layer is (1-2):(1-2).

[0034] In some specific embodiments, the weight ratio of the polyolefin to the carbon black in the second polyolefin layer is 100:1.

[0035] In some specific embodiments, the thickness of the steel skeleton layer is 2-3 mm, and the thickness of the modified polyphenylene sulfide layer is 1-2 mm.

[0036] In some specific embodiments, the thickness of the first polyolefin layer is 1.5-2.5 mm, and the thickness of the second polyolefin layer is 1-2 mm.

[0037] In some specific embodiments, the pipe body may be processed with anti-oxidation and high-temperature resistant materials according to specific working conditions and the properties of the transported medium, such as the concentration of strong acids and alkalis, especially concentrated sulfuric acid with strong oxidizing properties.

[0038] In the second aspect, based on the same inventive concept, the present invention provides a method for preparing the coking ammonium sulfate steel skeleton plastic composite pipe as described in any one of the first aspects, such as Figure 1 As shown, the preparation method comprises the following steps:

[0039] The preparation method comprises the following steps:

[0040] Step (1): pre-treating the pipe body, and then welding steel wire inside the pipe body to form a steel skeleton layer;

[0041] Step (2): performing welding point process on the steel skeleton layer to obtain the coked ammonium sulfate steel skeleton plastic composite pipe (the skeleton structure will not change due to thermal expansion and contraction during heating).

[0042] In some specific embodiments, the pretreatment includes rust removal.

[0043] The preparation method of the coked ammonium sulfate steel skeleton plastic composite pipe provided by the embodiment of the present invention is simple to operate, does not require additional specific equipment, and is suitable for mass industrial production. At the same time, the preparation method is based on the coked ammonium sulfate steel skeleton plastic composite pipe described in any one of the first aspects, so it has at least the beneficial effects of the coked ammonium sulfate steel skeleton plastic composite pipe described in any one of the first aspects, which will not be repeated here.

[0044] It should be noted that the component raw materials involved in the coked ammonium sulfate steel skeleton plastic composite pipe and its preparation method provided in the embodiment of the present invention, unless otherwise specified or specified, can be directly commercially available products or homemade using existing public preparation methods; at the same time, the steps and parameters involved, unless otherwise specified or specified, can be carried out according to the existing steel skeleton plastic composite pipe processing technology or directly using existing equipment, and the present invention document will not describe them one by one.

[0045] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0046] Example 1

[0047] This example provides a coked ammonium sulfate steel skeleton plastic composite pipe, the coked ammonium sulfate steel skeleton plastic composite pipe comprises a pipe body, the inner surface of the pipe body is sequentially provided with a steel skeleton layer, a modified polyphenylene sulfide layer, a first polyolefin layer and a second polyolefin layer;

[0048] The modified polyphenylene sulfide layer comprises raw materials including polyphenylene sulfide and non-metallic glass flakes;

[0049] The raw materials of the first polyolefin layer include polyethylene and polypropylene;

[0050] The raw materials of the second polyolefin layer include polyolefin and carbon black;

[0051] The weight ratio of the polyphenylene sulfide to the non-metallic glass flakes in the modified polyphenylene sulfide layer is 2:1;

[0052] The weight ratio of the polyethylene to the polypropylene in the first polyolefin layer is 1.5:1;

[0053] In the second polyolefin layer, the weight ratio of the polyolefin to the carbon black is 100:1, and the polyolefin is polyethylene;

[0054] The thickness of the steel skeleton layer is 2 mm, the thickness of the modified polyphenylene sulfide layer is 1 mm, the thickness of the first polyolefin layer is 1.5 mm, and the thickness of the second polyolefin layer is 1 mm.

[0055] The preparation method of the above-mentioned coking ammonium sulfate steel skeleton plastic composite pipe comprises the following steps:

[0056] Step (1): pre-treating the pipe body, and then welding steel wire inside the pipe body to form a steel skeleton layer;

[0057] Step (2): performing welding point process on the steel skeleton layer to obtain the coked ammonium sulfate steel skeleton plastic composite pipe.

[0058] Example 2

[0059] This example provides a coked ammonium sulfate steel skeleton plastic composite pipe, the coked ammonium sulfate steel skeleton plastic composite pipe comprises a pipe body, the inner surface of the pipe body is sequentially provided with a steel skeleton layer, a modified polyphenylene sulfide layer, a first polyolefin layer and a second polyolefin layer;

[0060] The modified polyphenylene sulfide layer comprises raw materials including polyphenylene sulfide and non-metallic glass flakes;

[0061] The raw materials of the first polyolefin layer include polyethylene and polypropylene;

[0062] The raw materials of the second polyolefin layer include polyolefin and carbon black;

[0063] The weight ratio of the polyphenylene sulfide to the non-metallic glass flakes in the modified polyphenylene sulfide layer is 2:1;

[0064] The weight ratio of the polyethylene to the polypropylene in the first polyolefin layer is 1:1;

[0065] In the second polyolefin layer, the weight ratio of the polyolefin to the carbon black is 100:1, and the polyolefin is polyethylene;

[0066] The thickness of the steel skeleton layer is 2 mm, the thickness of the modified polyphenylene sulfide layer is 1 mm, the thickness of the first polyolefin layer is 1.5 mm, and the thickness of the second polyolefin layer is 1 mm.

[0067] The preparation method of the above-mentioned coking ammonium sulfate steel skeleton plastic composite pipe comprises the following steps:

[0068] Step (1): pre-treating the pipe body, and then welding steel wire inside the pipe body to form a steel skeleton layer;

[0069] Step (2): performing welding point process on the steel skeleton layer to obtain the coked ammonium sulfate steel skeleton plastic composite pipe.

[0070] Example 3

[0071] This example provides a coked ammonium sulfate steel skeleton plastic composite pipe, the coked ammonium sulfate steel skeleton plastic composite pipe comprises a pipe body, the inner surface of the pipe body is sequentially provided with a steel skeleton layer, a modified polyphenylene sulfide layer, a first polyolefin layer and a second polyolefin layer;

[0072] The modified polyphenylene sulfide layer comprises raw materials including polyphenylene sulfide and non-metallic glass flakes;

[0073] The raw materials of the first polyolefin layer include polyethylene and polypropylene;

[0074] The raw materials of the second polyolefin layer include polyolefin and carbon black;

[0075] The weight ratio of the polyphenylene sulfide to the non-metallic glass flakes in the modified polyphenylene sulfide layer is 2:1;

[0076] The weight ratio of the polyethylene to the polypropylene in the first polyolefin layer is 2:1;

[0077] In the second polyolefin layer, the weight ratio of the polyolefin to the carbon black is 100:1, and the polyolefin is polyethylene;

[0078] The thickness of the steel skeleton layer is 2 mm, the thickness of the modified polyphenylene sulfide layer is 1 mm, the thickness of the first polyolefin layer is 1.5 mm, and the thickness of the second polyolefin layer is 1 mm.

[0079] The preparation method of the above-mentioned coking ammonium sulfate steel skeleton plastic composite pipe comprises the following steps:

[0080] Step (1): pre-treating the pipe body, and then welding steel wire inside the pipe body to form a steel skeleton layer;

[0081] Step (2): performing welding point process on the steel skeleton layer to obtain the coked ammonium sulfate steel skeleton plastic composite pipe.

[0082] Test Case

[0083] In this example, the coking ammonium sulfate steel skeleton plastic composite pipes of the above-mentioned embodiments 1 to 3 were subjected to performance tests.

[0084] 1) Performance test method: Thickness 8±1mm. The test results are shown in Table 1.

[0085] 2) Performance test method: Sparks are scattered and not gathered. The test results are shown in Table 2.

[0086] Table 1

[0087] Test samples Thickness test results Example 1 8.1mm Example 2 7.9mm Example 3 8.3mm

[0088] Table 2

[0089] Test samples Spark test results Example 1 Sparks are scattered and not gathered Example 2 Sparks are scattered and not gathered Example 3 Sparks are scattered and not gathered

[0090] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0091] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A coking ammonium sulfate steel skeleton plastic composite pipe, characterized in that: The coked ammonium sulfate steel skeleton plastic composite pipe comprises a pipe body, and the inner surface of the pipe body is sequentially provided with a steel skeleton layer, a modified polyphenylene sulfide layer, a first polyolefin layer and a second polyolefin layer; The modified polyphenylene sulfide layer comprises raw materials including polyphenylene sulfide and non-metallic glass flakes; The raw materials of the first polyolefin layer include polyethylene and polypropylene; The raw materials of the second polyolefin layer include polyolefin and carbon black; The polyolefin includes at least one of copolymerized propylene and ethylene-vinyl alcohol copolymer.

2. The coking ammonium sulfate steel skeleton plastic composite pipe according to claim 1, characterized in that: The weight ratio of the polyphenylene sulfide to the non-metallic glass flakes in the modified polyphenylene sulfide layer is 2:

1.

3. The coking ammonium sulfate steel skeleton plastic composite pipe according to claim 1, characterized in that: The weight ratio of the polyethylene to the polypropylene in the first polyolefin layer is (1-2):(1-2).

4. The coking ammonium sulfate steel skeleton plastic composite pipe according to claim 1, characterized in that: The weight ratio of the polyolefin to the carbon black in the second polyolefin layer is 100:

1.

5. The coking ammonium sulfate steel skeleton plastic composite pipe according to claim 1, characterized in that: The thickness of the steel skeleton layer is 2-3 mm, and the thickness of the modified polyphenylene sulfide layer is 1-2 mm.

6. The coking ammonium sulfate steel skeleton plastic composite pipe according to claim 1, characterized in that: The thickness of the first polyolefin layer is 1.5-2.5 mm, and the thickness of the second polyolefin layer is 1-2 mm.

7. A method for preparing the coking ammonium sulfate steel skeleton plastic composite pipe according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: Step (1): pre-treating the pipe body, and then welding steel wire inside the pipe body to form a steel skeleton layer; Step (2): performing welding point process on the steel skeleton layer to obtain the coked ammonium sulfate steel skeleton plastic composite pipe.

8. The method for preparing the coking ammonium sulfate steel skeleton plastic composite pipe according to claim 7, characterized in that: The pretreatment includes rust removal.

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