Composite pipe and production process thereof

Abstract

The present invention relates to the technical field, and specifically provides a composite pipe and a production process thereof. On the one hand, the present invention provides a composite pipe, including an inner seamless steel pipe and an outer diatomaceous earth ceramic pipe; an antibacterial coating containing a coptis chinensis extract is coated between the seamless steel pipe and the diatomaceous earth ceramic pipe, and a microbial coating containing gingivalis and nutrients is coated on the outer side of the diatomaceous earth ceramic pipe. The antibacterial coating coated between the seamless steel pipe and the diatomaceous earth ceramic pipe of the present invention can specifically inhibit gingivalis, so that the growth range of gingivalis does not touch the inner seamless steel pipe, and the corrosion of gingivalis and its secretions to the steel pipe is avoided, and the endotoxin and other virulence factors produced on the diatomaceous earth ceramic pipe and the formed biofilm are used to inhibit and repel the growth of other heterogeneous microorganisms; the present invention uses environmentally friendly coatings and a large amount of natural ingredients, and there is no secondary pollution to the environment.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline transportation, and in particular to a composite pipeline and a production process thereof. Background Art

[0002] At present, oil transportation is mainly carried out through pipeline transportation. Pipelines are mainly seamless steel pipes made of steel structure materials. After being buried, steel structure pipelines are easily affected by microorganisms in the external soil environment and the acid and alkali substances they secrete, causing chemical reactions, causing pipeline corrosion, shortening the service life of the pipeline, and even causing leakage after perforation, thereby increasing transportation costs and causing oil pollution, leading to economic losses and harming the public and the environment. Xia Shuanghui et al. clearly recorded in "Microbial Corrosion Mechanism and Its Impact on Corrosion Protection of Buried Pipelines": The coexistence of multiple microorganisms causes serious microbial corrosion. These microorganisms include metal oxidizing bacteria, sulfate-reducing bacteria, acid-producing bacteria and metal-reducing bacteria. They interact in a complex way to aggravate the corrosion of pipelines. At the same time, traditional paint-based anti-corrosion not only produces pollution during production, but the paint that falls off after use is difficult to degrade and causes secondary pollution.

[0003] Therefore, along with the development needs of oil transportation, it is urgent to develop an environmentally friendly composite pipeline resistant to soil microbial corrosion. Summary of the invention

[0004] In order to solve the above problems, the present invention aims to provide a composite pipe and a production process thereof.

[0005] In one aspect, the present invention provides a composite pipe, comprising an inner seamless steel pipe and an outer diatomaceous earth ceramic pipe;

[0006] An antibacterial coating is applied between the seamless steel tube and the diatomaceous earth ceramic tube, and a microbial coating is applied on the outside of the diatomaceous earth ceramic tube;

[0007] The components of the antibacterial coating include: 20-35% by weight of Coptis chinensis extract, 16% by weight of mussel protein, 1% by weight of defoamer AF 838, 3% by weight of leveling agent FLWL-137, and glycerol to make up the remaining weight;

[0008] The components of the microbial coating include: culture powder with a weight fraction of 35-40%, a weight fraction of 0.4% and a concentration of 7×10 6 / mL of Porphyromonas gingivalis, 2% by weight of SPERSE HLD-69 dispersant and pure water to make up the remaining weight;

[0009] The preparation method of the Coptidis rhizome extract comprises the following steps:

[0010] Step 1: Put 400g of fresh Coptis chinensis leaves into a vibration grinder, vibrate at a frequency of 50-70Hz, and grind at 1300-1600rpm for 50s to obtain Coptis chinensis powder paste;

[0011] Step 2: distilling the Rhizoma Coptidis powder paste at 60° C. and a vacuum degree of 500 mbar until no liquid continues to flow out, and collecting the distillate to obtain the Rhizoma Coptidis extract;

[0012] The preparation method of the culture powder comprises the following steps:

[0013] 100 g of pig bone marrow and mussel protein with a weight of 34% of pig bone marrow were placed in a freezing grinder at -46°C, and ground and mixed at 50-70 Hz for 200 seconds to obtain the culture powder;

[0014] Further, the vibration frequency of the vibration grinder is 65 Hz;

[0015] Further, the rotation speed of the vibration grinder is 1400 rpm;

[0016] Further, the weight fraction of the Coptis chinensis extract is 32%;

[0017] Further, the grinding frequency of the cryo-grinder is 60 Hz;

[0018] Further, the weight fraction of the culture powder is 38%;

[0019] In another aspect, the present invention provides a process for producing a composite pipe, the process comprising:

[0020] Step 1: putting the components of the antibacterial coating into a conical mixer with a mixing power of 1.2 kW and mixing for 140 seconds to obtain the antibacterial coating; circulating and mixing the components of the microbial coating through an SX type static mixer for 90 seconds to obtain the microbial coating;

[0021] Step 2: Evenly apply the antibacterial coating on the outside of the seamless steel pipe, with a coating amount of 80g / m 2 After drying the antibacterial coating, the seamless steel pipe is inserted into the diatomite ceramic tube, and the microbial coating is evenly applied on the outside of the diatomite ceramic tube. The coating amount is 160g / m 2 , and obtain the composite pipe.

[0022] The present invention can bring the following beneficial effects:

[0023] The present invention uses the porous adsorption effect of diatomaceous earth ceramic tubes to fix the microbial coating, and the nutrients of the microbial coating are also conducive to the growth of Porphyromonas gingivalis of the present invention. The Porphyromonas gingivalis of the present invention quickly becomes the dominant flora in the diatomaceous earth ceramic tube area under the growth environment of the present invention. The endotoxin and other virulence factors produced by the diatomaceous earth ceramic tubes and the biofilm formed can inhibit and exclude the growth of other heterologous microorganisms, thereby avoiding the serious corrosion of the pipeline caused by the growth of multiple bacteria such as metal oxidizing bacteria, sulfate-reducing bacteria, acid-producing bacteria and metal-reducing bacteria.

[0024] The antibacterial coating coated between the seamless steel pipe and the diatomaceous earth ceramic pipe of the present invention can specifically inhibit Porphyromonas gingivalis, so that the growth range of Porphyromonas gingivalis does not touch the inner seamless steel pipe, thereby avoiding corrosion of the inner pipe by Porphyromonas gingivalis and its secretions.

[0025] The vibration grinding process of the antibacterial coating of the present invention improves the sensitivity of the coptis chinensis leaves to shear crushing through vibration, thereby improving the extraction rate while avoiding excessive physical damage; the preparation process of the culture powder of the present invention utilizes the embrittlement of pig bone marrow by low temperature, and uniformly mixes it with mussel protein while controlling the appropriate grinding particle size, so as to facilitate the construction of a growth coating system for Porphyromonas gingivalis through a static mixer in the later stage. The coating amount of the microbial coating of the present invention takes into account the reproduction of Porphyromonas gingivalis in the growth environment of the present invention, so that it can form a dominant flora as soon as possible, but will not break through the restriction of the antibacterial coating of the present invention to corrode the inner layer of the seamless steel pipe.

[0026] The coatings of the present invention are all environmentally friendly coatings, using a large amount of biological natural ingredients, without secondary pollution such as heavy metals to the environment, and meet the current needs of protecting the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] In the attached picture: Figure 1 A structural schematic diagram of a specific implementation mode of the composite pipeline provided by the present invention; in the figure: 1. seamless steel pipe, 2. diatomaceous earth ceramic pipe. DETAILED DESCRIPTION

[0029] In order to more clearly explain the overall concept of the present invention, the overall scheme of the present invention is described in detail in the form of embodiments below; in the following description, a large number of specific details are given to provide a more thorough understanding of the present invention; however, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details; in other examples, in order to avoid confusion with the present invention, some technical features known in the art are not described.

[0030] The vibration grinder in the present invention was purchased from Shanghai Cebo Biotechnology Development Center Co., Ltd., with the article number FSTPRP-YLS-02; the conical mixer was purchased from Shanghai Chongye Industrial Co., Ltd., with the model ZX-0.05; the freezing grinder was purchased from Shanghai Jingxin Industrial Development Co., Ltd.; the SX-type static mixer was purchased from Shanghai Chongye Industrial Co., Ltd., with the model SX-75 / 300; the mussel protein was purchased from Shaanxi Haibo Biotechnology Co., Ltd., with the article number HB-YBZDB; the seamless steel pipe was purchased from Tianjin Fajiu Metal Materials Co., Ltd., with the strength x80 and the specification 1016*25.4cm; the diatomite ceramic pipe was purchased from Dongguan Shengye Precision Ceramic Technology Co., Ltd.; the defoamer AF 838, the leveling agent FLW L-137 and the dispersant SPERSE HLD-69 in the present invention were purchased from Silcona GmbH&CO.KG.

[0031] Unless otherwise specified, all raw material components in the following examples can be purchased through commercial channels, the experimental instruments used are conventional laboratory experimental instruments, and the performance testing methods are the testing methods known in the art.

[0032] The preferred implementation is as follows:

[0033] Embodiment 1:

[0034] The components of the antibacterial coating include: 32% by weight of Coptis chinensis extract, 16% by weight of mussel protein, 1% by weight of defoamer AF 838, 3% by weight of leveling agent FLWL-137, and glycerol to make up the remaining weight;

[0035] The components of the microbial coating include: culture powder with a weight fraction of 38%, a weight fraction of 0.4% and a concentration of 7×10 6 / mL of Porphyromonas gingivalis, 2% by weight of SPERSE HLD-69 dispersant and pure water to make up the remaining weight;

[0036] The preparation method of the coptis root extract comprises the following steps:

[0037] Step 1: Put 400g of fresh Coptis chinensis leaves into a vibration grinder, vibrate at 65Hz, grind at 1400rpm for 50s to obtain Coptis chinensis powder paste;

[0038] Step 2: distill the coptis root powder paste at 60° C. and a vacuum degree of 500 mbar until no liquid continues to flow out, and collect the distillate to obtain the coptis root extract;

[0039] The preparation method of culture powder comprises the following steps:

[0040] 100 g of pig bone marrow and mussel protein with a weight of 34% of the pig bone marrow were placed in a freezing grinder at -46°C, ground and mixed at 60 Hz for 200 seconds to obtain culture powder.

[0041] The production process of composite pipes includes:

[0042] Step 1: Put the components of the antibacterial coating into a conical mixer with a mixing power of 1.2 kW and mix for 140 seconds to obtain the antibacterial coating; Circulate and mix the components of the microbial coating through an SX-type static mixer for 90 seconds to obtain the microbial coating;

[0043] Step 2: Apply antibacterial coating evenly on the outside of the seamless steel pipe, with a coating amount of 80g / m 2 After drying the antibacterial coating, the seamless steel pipe is inserted into the diatomite ceramic tube, and the microbial coating is evenly applied on the outside of the diatomite ceramic tube. The coating amount is 160g / m 2 , a composite pipe is obtained.

[0044] Embodiment 2-11:

[0045] The only difference between Example 2 and Example 1 is that the vibration frequency of the vibration grinder is 50 Hz;

[0046] The only difference between Example 3 and Example 1 is that the vibration frequency of the vibration grinder is 70 Hz;

[0047] The only difference between Example 4 and Example 1 is that the rotation speed of the vibration grinder is 1300 rpm;

[0048] The only difference between Example 5 and Example 1 is that the rotation speed of the vibration grinder is 1600 rpm;

[0049] The only difference between Example 6 and Example 1 is that the weight fraction of the Coptis chinensis extract is 20%;

[0050] The only difference between Example 7 and Example 1 is that the weight fraction of the Coptis chinensis extract is 35%;

[0051] The only difference between Example 8 and Example 1 is that the grinding frequency of the cryo-grinder is 50 Hz;

[0052] The only difference between Example 9 and Example 1 is that the grinding frequency of the cryo-grinder is 70 Hz;

[0053] The only difference between Example 10 and Example 1 is that the weight fraction of the culture powder is 35%;

[0054] The only difference between Example 11 and Example 1 is that the weight fraction of the culture powder is 40%.

[0055] Comparative Examples 1-21:

[0056] The only difference between Comparative Example 1 and Example 1 is that the vibration frequency of the vibration grinder is 90 Hz;

[0057] The only difference between Comparative Example 2 and Example 1 is that the rotation speed of the vibration grinder is 2300 rpm;

[0058] The only difference between Comparative Example 3 and Example 1 is that the weight fraction of the Coptis chinensis extract is 40%;

[0059] The only difference between Comparative Example 4 and Example 1 is that the grinding frequency of the cryo-grinder is 100 Hz;

[0060] The difference between Comparative Example 5 and Example 1 is that the weight fraction of the culture powder is 60%;

[0061] The difference between Comparative Example 6 and Example 1 is that the temperature of vacuum distillation is 50°C;

[0062] The difference between Comparative Example 7 and Example 1 is that the temperature of vacuum distillation is 70°C;

[0063] The difference between Comparative Example 8 and Example 1 is that the vacuum degree of reduced pressure distillation is 800 mbar;

[0064] The only difference between Comparative Example 9 and Example 1 is that the mixing power of the conical mixer is 1.4 kW and the mixing time is 200 s;

[0065] The only difference between Comparative Example 10 and Example 1 is that in the preparation of the microbial coating, the weight of mussel protein is 50% of the weight of pig bone marrow;

[0066] The only difference between Comparative Example 11 and Example 1 is that the freezing temperature of the freezer grinder is -55°C;

[0067] The only difference between Comparative Example 12 and Example 1 is that the weight fraction of Porphyromonas gingivalis is 1.0%;

[0068] The difference between Comparative Example 13 and Example 1 is that the static mixer circulates and mixes for 150 seconds;

[0069] The difference between Comparative Example 14 and Example 1 is that the leaves of Coptis chinensis are replaced with Coptis chinensis roots;

[0070] The difference between Comparative Example 15 and Example 1 is that the pig bone marrow is replaced with beef peptone;

[0071] The difference between Comparative Example 16 and Example 1 is that Porphyromonas gingivalis is replaced by Bacillus subtilis;

[0072] The difference between Comparative Example 17 and Example 1 is that the coating amount of the microbial coating is 280 g / m 2 ;

[0073] The only difference between Comparative Example 18 and Example 1 is that the weight fraction of the defoaming agent AF 838 is 2%;

[0074] The only difference between Comparative Example 19 and Example 1 is that the weight fraction of the leveling agent FLWL-137 is 5%;

[0075] The only difference between Comparative Example 20 and Example 1 is that the weight fraction of SPERSE HLD-69 dispersant is 4%;

[0076] Comparative Example 21 uses only a single-layer seamless steel pipe.

[0077] The composite pipes prepared in the above examples were tested for antibacterial corrosion:

[0078] Prepare three 50 cm sections of the composite pipes prepared in each of the above examples, fill each section with soil to cover the composite pipe by 0.5 m, control the soil moisture content to 14%, and place glass surfaces near the openings at both ends of the composite pipes to seal the openings and observe; add 5×10 6 / mL of sulfate-reducing bacteria, iron-oxidizing bacteria and acid-producing bacteria, 5ml each, were added and observed once a day. The days on which bacterial plaque appeared near the outer cross-section of each seamless steel pipe were recorded, and the days on which rust spots appeared near the outer cross-section of each seamless steel pipe were recorded to indicate the ability to resist soil microbial corrosion.

[0079] The test results of each example are the average of the three days measured for each example and the integer is retained, see Table 1.

[0080] Table 1:

[0081]

[0082] It can be seen from the data in Table 1 that, compared with other examples, the composite pipe of the embodiment of the present invention has good resistance to corrosion by sulfate-reducing bacteria, iron-oxidizing bacteria and acid-producing bacteria, and good resistance to soil microbial corrosion, among which Example 1 of the present invention has the best effect.

[0083] Specific antibacterial test:

[0084] According to Appendix A "Antibacterial coatings - Test methods for antibacterial performance" of the Chemical Industry Standard of the People's Republic of China HG / T 3950-2007, the bacterial species selected were Porphyromonas gingivalis, Bacillus subtilis, sulfate-reducing bacteria, iron-oxidizing bacteria and acid-producing bacteria, which were respectively recorded as bacterial species 1 to 5. The coating selected was the antibacterial coating of the present invention. Each bacterial species was tested three times, and the antibacterial rate results were averaged three times and retained to the integer. The test results are shown in Table 2.

[0085] Table 2:

[0086]

[0087] It can be seen from the data in Table 2 that the antibacterial coating of the present invention has the highest antibacterial rate against species 1, and is significantly different from species 2 to 4. The antibacterial coating coated between the seamless steel pipe and the diatomaceous earth ceramic pipe of the present invention can specifically inhibit Porphyromonas gingivalis.

[0088] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A composite pipe, characterized in that: The composite pipe comprises an inner seamless steel pipe and an outer diatomaceous earth ceramic pipe; An antibacterial coating is applied between the seamless steel tube and the diatomaceous earth ceramic tube, and a microbial coating is applied on the outside of the diatomaceous earth ceramic tube; The components of the antibacterial coating include: 20-35% by weight of Coptis chinensis extract, 16% by weight of mussel protein, 1% by weight of defoamer AF 838, 3% by weight of leveling agent FLWL-137, and glycerol to make up the remaining weight; The components of the microbial coating include: culture powder with a weight fraction of 35-40%, a weight fraction of 0.4% and a concentration of 7×10 6 / mL of Porphyromonas gingivalis, 2% by weight of SPERSE HLD-69 dispersant and pure water to make up the remaining weight; The preparation method of the Coptidis rhizome extract comprises the following steps: Step 1: Put 400g of fresh Coptis chinensis leaves into a vibration grinder, vibrate at a frequency of 50-70Hz, and grind at 1300-1600rpm for 50s to obtain Coptis chinensis powder paste; Step 2: distilling the Coptidis powder paste at 60° C. and a vacuum degree of 500 mbar until no liquid continues to flow out, and collecting the distillate to obtain the Coptidis extract; The preparation method of the culture powder comprises the following steps: 100 g of pig bone marrow and mussel protein with a weight of 34% of the pig bone marrow were placed in a freezing grinder at -46°C, and ground and mixed at 50-70 Hz for 200 seconds to obtain the culture powder.

2. The composite pipe according to claim 1, characterized in that: The vibration frequency of the vibration grinder is 65 Hz.

3. The composite pipe according to claim 1, characterized in that: The rotation speed of the vibration mill is 1400 rpm.

4. The composite pipe according to claim 1, characterized in that: The weight fraction of the Coptis chinensis extract is 32%.

5. The composite pipe according to claim 1, characterized in that: The grinding frequency of the cryo-grinder was 60 Hz.

6. The composite pipe according to claim 1, characterized in that: The weight fraction of the culture powder is 38%.

7. A process for producing a composite pipe according to any one of claims 1 to 6, characterized in that: The process comprises: Step 1: putting the components of the antibacterial coating into a conical mixer with a mixing power of 1.2 kW and mixing for 140 seconds to obtain the antibacterial coating; circulating and mixing the components of the microbial coating through an SX type static mixer for 90 seconds to obtain the microbial coating; Step 2: Evenly apply the antibacterial coating on the outside of the seamless steel pipe, with a coating amount of 80g / m 2 After drying the antibacterial coating, the seamless steel pipe is inserted into the diatomite ceramic tube, and the microbial coating is evenly applied on the outside of the diatomite ceramic tube. The coating amount is 160g / m 2 , and obtain the composite pipe.

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