High-pressure pipe with high-strength fibers and epoxy resin as raw materials and preparation method of high-pressure pipe

Abstract

The invention discloses a high-pressure pipe using high-strength fiber and epoxy resin as raw materials and a preparation method thereof, and relates to the technical field of high-pressure pipes, and the high-pressure pipe comprises the following components in parts by weight: 50-70 parts of high-strength fiber, 30-50 parts of epoxy resin, 5-10 parts of a curing agent, 3-8 parts of a toughening agent and 1-3 parts of an antioxidant. The high-pressure pipe provided by the invention has excellent high-pressure resistance, chemical corrosion resistance and longer service life, and is suitable for high-pressure fluid transportation under extreme working conditions. By optimizing the raw material ratio and the preparation process, the defects in the prior art are overcome, and the method has remarkable technical advantages and application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure pipes, and particularly to a high-pressure pipe made of high-strength fibers and epoxy resin and a preparation method thereof, which is applicable to the high-pressure fluid transportation in the fields of petroleum, chemical industry, aerospace, etc. Background Art

[0002] A high-pressure pipe is a pipeline used for transporting high-pressure fluids (such as gases, liquids), and is widely used in the fields of petroleum, chemical industry, aerospace, energy, etc. Due to its complex working environment, the high-pressure pipe needs to have excellent high-pressure resistance, chemical corrosion resistance and good mechanical strength.

[0003] There are many deficiencies in the existing high-pressure pipes. For example, the high-pressure resistance is insufficient: although traditional metal high-pressure pipes (such as stainless steel pipes) have relatively high strength, they are prone to fatigue fracture in extremely high-pressure environments, and their weight is relatively large, increasing the installation and maintenance costs; the chemical corrosion resistance is poor: metal high-pressure pipes are prone to corrosion in strong acid, strong alkali or high-salt environments, resulting in shortened pipeline life; heavy weight and high cost: the density of metal high-pressure pipes is relatively high, resulting in a large overall weight, inconvenient transportation and installation, and relatively high raw material costs; limitations of composite high-pressure pipes: existing composite high-pressure pipes mostly use single fiber reinforcement materials (such as glass fibers), and their strength and corrosion resistance are limited, making it difficult to meet the requirements of extreme working conditions.

[0004] Therefore, how to provide a high-pressure pipe with high-pressure resistance and corrosion resistance is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a high-pressure pipe made of high-strength fibers and epoxy resin and a preparation method thereof.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] On the one hand, an embodiment of the present invention provides a high-pressure pipe made of high-strength fibers and epoxy resin, which comprises the following components in parts by weight: 50-70 parts of high-strength fibers, 30-50 parts of epoxy resin, 5-10 parts of curing agent, 3-8 parts of toughening agent and 1-3 parts of antioxidant.

[0008] In a preferred embodiment, the high-strength fiber is one or a combination of carbon fiber, aramid fiber or glass fiber.

[0009] In a preferred embodiment, the epoxy resin is bisphenol A epoxy resin or phenolic epoxy resin.

[0010] In a preferred embodiment, the curing agent is an amine curing agent or an acid anhydride curing agent;

[0011] Preferably, the amine curing agent includes ethylenediamine or triethylenetetramine;

[0012] Preferably, the anhydride curing agent includes phthalic anhydride.

[0013] In a preferred embodiment, the toughening agent is rubber particles or nano-silica;

[0014] Preferably, the rubber particles are EPDM rubber particles with a diameter of 1 - 3 mm;

[0015] Preferably, the diameter of the nano-silica is 5 - 20 nm.

[0016] The second aspect of the embodiments of the present invention provides a method for preparing a high-pressure pipe, including the following steps:

[0017] Step 1: Weigh each component according to parts by weight, and then mix the high-strength fiber and epoxy resin and stir evenly;

[0018] Step 2: Add the curing agent, toughening agent and antioxidant, and continue to stir until evenly mixed;

[0019] Step 3: Inject the mixture into a mold, heat and cure it, the curing temperature is 120 - 160 °C, and the curing time is 2 - 4 h;

[0020] Step 4: After demolding, perform surface treatment to obtain the high-pressure pipe.

[0021] Preferably, the curing temperature is 140 °C and the curing time is 3 h.

[0022] Preferably, the surface treatment includes spraying an anti-corrosion coating or polishing treatment.

[0023] The third aspect of the embodiments of the present invention provides the application of the high-pressure pipe, and the high-pressure pipe is suitable for high-pressure fluid transportation in the fields of petroleum, chemical industry, and aerospace

[0024] In summary, compared with the prior art, the present invention provides a high-pressure pipe and its preparation method using high-strength fiber and epoxy resin as raw materials. The high-pressure pipe has the following advantages:

[0025] Excellent high-pressure resistance: Through the synergistic effect of high-strength fiber and epoxy resin, the compressive strength of the pipeline is significantly improved.

[0026] Strong chemical corrosion resistance: Epoxy resin has excellent chemical corrosion resistance and can adapt to harsh environments such as strong acids and strong alkalis.

[0027] Light weight and low cost: Prepared by using composite materials, with low density and light weight, reducing the transportation and installation costs.

[0028] Long service life: By optimizing the formula and process, the durability and reliability of the pipeline are significantly improved. Detailed implementation manners

[0029] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Example 1: Carbon fiber reinforced high-pressure pipe

[0031] 1. Raw material ratio:

[0032] Carbon fiber: 60 parts by weight, bisphenol A epoxy resin: 40 parts by weight;

[0033] Ethylenediamine: 8 parts by weight;

[0034] Rubber particle toughening agent (EPDM rubber particles, diameter 1 - 3 mm): 5 parts by weight;

[0035] Antioxidant: 2 parts by weight.

[0036] Preparation method:

[0037] Mix the carbon fiber and epoxy resin and stir evenly;

[0038] Add the curing agent, toughening agent and antioxidant, and continue to stir until evenly mixed;

[0039] Inject the mixture into a mold and cure at 140 °C for 3 h;

[0040] After demolding, perform surface polishing treatment.

[0041] Performance test:

[0042] Compressive strength: 350 MPa;

[0043] Chemical corrosion resistance: Immerse in 10% HCl solution for 30 days, mass loss rate < 0.5%;

[0044] Service life: > 10 years.

[0045] Example 2: Aramid fiber reinforced high-pressure pipe

[0046] Raw material ratio:

[0047] Aramid fiber: 55 parts by weight;

[0048] Phenolic epoxy resin: 45 parts by weight;

[0049] Phthalic anhydride: 7 parts by weight;

[0050] Nano-silica toughening agent (5 - 20 nm): 6 parts by weight;

[0051] Antioxidant: 1.5 parts by weight.

[0052] Preparation method: The same as that in Example 1.

[0053] Performance test:

[0054] Compressive strength: 320 MPa;

[0055] Chemical corrosion resistance: Immersed in 10% NaOH solution for 30 days, mass loss rate < 0.6%; Service life: > 9 years.

[0056] Example 3: Glass fiber reinforced high-pressure pipe

[0057] Raw material ratio:

[0058] Glass fiber: 65 parts by weight;

[0059] Bisphenol A epoxy resin: 35 parts by weight;

[0060] Triethylenetetramine: 9 parts by weight;

[0061] Rubber particle toughening agent (EPDM rubber particles, diameter 1 - 3 mm): 4 parts by weight; Antioxidant: 2.5 parts by weight.

[0062] Preparation method: The same as that in Example 1.

[0063] Performance test:

[0064] Compressive strength: 300 MPa;

[0065] Chemical corrosion resistance: Immersed in 10% NaCl solution for 30 days, mass loss rate < 0.7%; Service life: > 8 years.

[0066] Comparative example

[0067] Comparative example 1: Single carbon fiber reinforced high-pressure pipe (without toughening agent)

[0068] Raw material ratio:

[0069] Carbon fiber: 60 parts by weight;

[0070] Bisphenol A epoxy resin: 40 parts by weight;

[0071] Phthalic anhydride: 8 parts by weight;

[0072] Antioxidant: 2 parts by weight.

[0073] Performance test:

[0074] Compressive strength: 280 MPa;

[0075] Chemical corrosion resistance: Immersed in 10% HCl solution for 30 days, mass loss rate 1.2%; Service life: 6 years.

[0076] Comparative Example 2: Single epoxy resin high-pressure pipe (without high-strength fiber)

[0077] Raw material ratio:

[0078] Bisphenol A epoxy resin: 100 parts by weight;

[0079] Phthalic anhydride: 10 parts by weight;

[0080] Antioxidant: 3 parts by weight.

[0081] Performance test:

[0082] Compressive strength: 150 MPa;

[0083] Chemical corrosion resistance: Immersed in 10% HCl solution for 30 days, mass loss rate 2.5%; Service life: 3 years.

[0084] Comparative Example 3: High-pressure pipe without antioxidant

[0085] Raw material ratio:

[0086] Carbon fiber: 60 parts by weight;

[0087] Bisphenol A epoxy resin: 40 parts by weight;

[0088] Phthalic anhydride: 8 parts by weight;

[0089] Toughening agent (EPDM rubber particles, diameter 1 - 3 mm): 5 parts by weight.

[0090] Performance test:

[0091] Compressive strength: 330 MPa;

[0092] Chemical corrosion resistance: Immersed in 10% HCl solution for 30 days, mass loss rate 1.8%; Service life: 5 years.

[0093] Comparative Example 4: Imbalance in the ratio of high-strength fiber to epoxy resin (1:1)

[0094] Raw material ratio:

[0095] Carbon fiber: 50 parts by weight;

[0096] Bisphenol A epoxy resin: 50 parts by weight;

[0097] Phthalic anhydride: 8 parts by weight;

[0098] Toughening agent (EPDM rubber particles, diameter 1 - 3 mm): 5 parts by weight;

[0099] Antioxidant: 2 parts by weight.

[0100] Performance test:

[0101] Compressive strength: 250 MPa;

[0102] Chemical corrosion resistance: Immersed in 10% HCl solution for 30 days, mass loss rate 1.5%; Service life: 7 years.

[0103] Comparative example 5: Curing temperature too low (100 °C)

[0104] Raw material ratio: Same as in Example 1.

[0105] Preparation method: Curing temperature is 100 °C, curing time is 3 hours.

[0106] Performance test:

[0107] Compressive strength: 200 MPa;

[0108] Chemical corrosion resistance: Immersed in 10% HCl solution for 30 days, mass loss rate 2.0%;

[0109] Service life: 4 years.

[0110] Experimental data analysis is shown in Table 1

[0111] Table 1

[0112] Group Compressive strength (MPa) Chemical corrosion resistance (mass loss rate) Service life (years) Example 1 350 <0.5％ >10 Example 2 320 <0.6％ >9 Example 3 300 <0.7％ >8 Comparative example 1 280 1.2％ 6 Comparative example 2 150 2.5％ 3 Comparative example 3 330 1.8％ 5 Comparative example 4 250 1.5％ 7 Comparative example 5 200 2.0％ 4

[0113] From Table 1 and the data of each group, it can be seen that high-strength fibers and epoxy resin have a synergistic effect: The compressive strength of Examples 1 - 3 is significantly higher than that of Comparative Examples 1 - 5, indicating that the synergistic effect of high-strength fibers and epoxy resin can significantly improve the mechanical properties of the pipeline. The compressive strength and service life of Comparative Example 1 (without toughening agent) are significantly lower than those of Example 1, and the chemical corrosion resistance and service life of Comparative Example 3 (without antioxidant) are poor, indicating that the antioxidant can delay the aging of the pipeline. The performance of Comparative Example 5 (curing temperature too low) has significantly decreased, indicating that an appropriate curing temperature is the key to ensuring the pipeline performance. Therefore, the high-pressure pipe provided by the present invention has excellent high-pressure resistance, chemical corrosion resistance and long service life, and is suitable for high-pressure fluid transportation under extreme working conditions. By optimizing the raw material ratio and preparation process, the defects of the prior art are solved, and it has significant technical advantages and application prospects.

[0114] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0115] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can 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 these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-pressure pipe made of high-strength fiber and epoxy resin, characterized in that, It comprises the following components in parts by weight: 50 - 70 parts of high-strength fiber, 30 - 50 parts of epoxy resin, 5 - 10 parts of curing agent, 3 - 8 parts of toughening agent, and 1 - 3 parts of antioxidant.

2. The high-pressure pipe according to claim 1, wherein, The high-strength fiber is one or a combination of carbon fiber, aramid fiber, or glass fiber.

3. The high-pressure pipe according to claim 1, wherein The epoxy resin is bisphenol A epoxy resin or phenolic epoxy resin.

4. The high-pressure pipe according to claim 1, characterized in that, The curing agent is an amine curing agent or an acid anhydride curing agent; Preferably, the amine curing agent includes ethylenediamine or triethylenetetramine; Preferably, the acid anhydride curing agent includes phthalic anhydride.

5. The high-pressure pipe according to claim 1, wherein The toughening agent is rubber particles or nano-silica; Preferably, the rubber particles are EPDM rubber particles with a diameter of 1 - 3 mm; Preferably, the diameter of the nano-silica is 5 - 20 nm.

6. A method for preparing a high-pressure pipe according to any one of claims 1-5, characterized in that, It includes the following steps: Step 1: Weigh each component according to the parts by weight, and then mix the high-strength fiber and the epoxy resin and stir evenly; Step 2: Add the curing agent, toughening agent, and antioxidant, and continue to stir until uniform; Step 3: Inject the mixture into a mold, heat and cure it, the curing temperature is 120 - 160 °C, and the curing time is 2 - 4 h; Step 4: After demolding, perform surface treatment to obtain a high-pressure pipe.

7. The preparation method according to claim 6, characterized in that, The curing temperature is 140 °C, and the curing time is 3 h.

8. The preparation method according to claim 6, wherein, The surface treatment includes spraying an anti-corrosion coating or polishing treatment.

9. An application of the high-pressure pipe according to any one of claims 1-5, characterized in that, The high-pressure pipe is applicable to the high-pressure fluid transportation in the fields of petroleum, chemical industry, and aerospace.