CN-122014922-A - High-barrier glass fiber reinforced plastic composite pipe and forming method thereof

CN122014922ACN 122014922 ACN122014922 ACN 122014922ACN-122014922-A

Abstract

The invention discloses a high-barrier glass fiber reinforced plastic composite pipe and a forming method thereof, and belongs to the technical field of composite pipes. The high-barrier glass fiber reinforced plastic composite pipe is characterized in that a barrier layer is arranged between an inner lining pipe and a reinforcing layer, a polar material is added in the inner lining pipe, an aluminum foil is connected with the inner lining pipe containing the polar material through a pressure-sensitive adhesive, the connectivity between the aluminum foil and the inner lining pipe is enhanced by means of good combination of the pressure-sensitive adhesive and the polar material, an oxidation layer with a certain polarity is arranged on the outer surface of the aluminum foil, so that the aluminum foil and thermosetting resin have good connectivity, and the thermosetting resin is contained in the reinforcing layer, so that the thermosetting resin can be used as a middle bonding layer to better connect the reinforcing layer and the barrier layer. The invention provides the binding force between the lining pipe and the reinforcing layer, and simultaneously effectively avoids the stress concentration phenomenon caused by the reinforcing ribs, and on the other hand, the barrier layer can improve the gas barrier property of the pipe, widens the application range of the pipe, and can be applied to the fields of gas transmission including high-pressure hydrogen transmission.

Inventors

ZHANG DONGNA
KONG LUSHI
SHAO XIAODONG
DING NAN
MA DING
ZHANG ZHAO

Assignees

中国石油天然气集团有限公司
中国石油集团工程材料研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. The high-barrier glass fiber reinforced plastic composite pipe is characterized by comprising an inner lining pipe (1), wherein the outer surface of the inner lining pipe (1) is wrapped by a barrier layer (2), and the outer surface of the barrier layer (2) is wrapped by a reinforcing layer (3); The lining pipe (1) is added with a polar material, the reinforcing layer (3) is a glass fiber reinforced thermosetting resin composite material, and the glass fiber reinforced thermosetting resin composite material contains thermosetting resin; The barrier layer (2) is a composite aluminum foil, the composite aluminum foil comprises an aluminum foil and a pressure-sensitive adhesive, and the pressure-sensitive adhesive is arranged on the contact surface of the aluminum foil and the lining pipe (1); The reinforcing layer (3) is connected to the barrier layer (2) by means of a thermosetting resin.
2. The high-barrier glass fiber reinforced plastic composite pipe according to claim 1, wherein the lining pipe (1) is made of polypropylene.
3. The high-barrier glass fiber reinforced plastic composite pipe according to claim 2, wherein the lining pipe (1) comprises, by mass, 100 parts of polypropylene, 2-10 parts of polar materials, 1-2 parts of plasticizers and 0.1-0.5 part of antioxidants.
4. The high-barrier glass fiber reinforced plastic composite pipe according to claim 3, wherein the polar material is an epoxy group-containing compound, a hydroxyl group-containing compound or a carbonyl group-containing compound, the plasticizer is vinyl bis-stearamide or pentaerythritol, and the antioxidant is antioxidant 1010.
5. The high-barrier glass fiber reinforced plastic composite pipe according to claim 4, wherein an initiator and an active agent are further added to the polar material.
6. The high barrier glass fiber reinforced plastic composite pipe of claim 1, wherein the glass fiber reinforced thermoset resin composite further comprises continuous glass fibers.
7. The high-barrier glass fiber reinforced plastic composite pipe according to claim 6, wherein the mass fraction of the continuous glass fiber in the glass fiber reinforced thermosetting resin composite material is 65% -75%, and the rest is thermosetting resin.
8. The high barrier glass fiber reinforced plastic composite pipe according to claim 1, wherein the thermosetting resin is any one of epoxy resin, vinyl resin and unsaturated polyester.
9. A method of forming a high barrier glass reinforced plastic composite pipe as defined in claim 1, comprising the steps of: S1, extruding and granulating the mixed raw materials of the lining pipe (1) to obtain raw material particles, and extruding and molding the raw material particles into the lining pipe (1); s2, winding a composite aluminum foil on the outer surface of the lining tube (1), and bonding the aluminum foil in the composite aluminum foil with the lining tube (1) through a pressure-sensitive adhesive to obtain a barrier layer (2); S3, coating a layer of thermosetting resin on the outer surface of the barrier layer (2), and winding a glass fiber reinforced thermosetting resin composite material outside the thermosetting resin to obtain the reinforcing layer (3).
10. The method for forming the high-barrier glass fiber reinforced plastic composite pipe according to claim 9, wherein in S2, when residual heat exists after the inner lining pipe (1) is extruded, the outer surface of the inner lining pipe (1) is wound with a composite aluminum foil, the composite aluminum foil is wound and reciprocated for N times, and N is a natural number more than or equal to 1.

Description

High-barrier glass fiber reinforced plastic composite pipe and forming method thereof Technical Field The invention belongs to the technical field of composite pipes, and particularly relates to a high-barrier glass fiber reinforced plastic composite pipe and a forming method thereof. Background The glass fiber reinforced plastic composite pipe is composed of an inner layer thermoplastic plastic lining pipe and a fiber reinforced thermosetting resin composite material coated outside the lining pipe, combines the high strength of the composite material and the barrier property of the thermoplastic plastic, has the advantages of corrosion resistance, good hydraulic characteristic, long service life, light weight and the like, and is mainly applied to the field of gathering and transportation of oil and gas fields. However, it is worth noting that, since the lining pipe and the reinforcing layer are respectively thermoplastic plastics and thermosetting plastics, and the conventional lining pipe polyolefin material has poor bonding capability, the two structural layers have no bonding force, and slip easily occurs between the two structural layers in the transportation and installation processes. In addition, when the oil field is in service in some severe environments such as western oil fields, delamination of two structural layers can be caused by expansion with heat and contraction with cold caused by temperature difference. In order to solve the problem, a method of sticking reinforcing ribs outside the lining tube is generally used, an uneven surface layer is constructed by the reinforcing ribs, and then a composite material layer is wound, wherein the winding angle of the composite material layer is opposite to the direction of the reinforcing ribs so as to avoid sliding between the lining tube and the reinforcing layer. However, due to the existence of the reinforcing ribs, when the pipe body bears certain internal pressure, the position of the reinforcing ribs has obvious stress concentration phenomenon on the glass fiber reinforced thermosetting resin composite material, so that the pipe body is stressed unevenly, and local stress is overlarge, so that the pipe body is easy to fail. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides a high-barrier glass fiber reinforced plastic composite pipe and a preparation method thereof, so as to solve the problems that the stress concentration at the position of a reinforcing rib exists in the high-barrier glass fiber reinforced plastic composite pipe in the prior art, so that the stress of a pipe body is uneven, the local stress is overlarge, and the pipe body is easy to fail. In order to achieve the purpose, the invention is realized by adopting the following technical scheme: The high-barrier glass fiber reinforced plastic composite pipe comprises an inner lining pipe, wherein the outer surface of the inner lining pipe is wrapped by a barrier layer, and the outer surface of the barrier layer is wrapped by a reinforcing layer; the lining pipe is added with a polar material, the reinforcing layer is a glass fiber reinforced thermosetting resin composite material, and the glass fiber reinforced thermosetting resin composite material contains thermosetting resin; the barrier layer is a composite aluminum foil which comprises an aluminum foil and a pressure-sensitive adhesive, and the pressure-sensitive adhesive is arranged on the contact surface of the aluminum foil and the lining pipe; the reinforcing layer is connected to the barrier layer by a thermosetting resin. The invention further improves that: Preferably, the lining pipe is made of polypropylene. Preferably, the lining tube comprises 100 parts by mass of polypropylene, 2-10 parts by mass of polar material, 1-2 parts by mass of plasticizer and 0.1-0.5 part by mass of antioxidant. Preferably, the polar material is an epoxy group-containing compound, a hydroxyl group-containing compound or a carbonyl group-containing compound, the plasticizer is vinyl bis-stearamide or pentaerythritol, and the antioxidant is antioxidant 1010. Preferably, an initiator and an active agent are also added to the polar material. Preferably, the glass fiber reinforced thermosetting resin composite material further comprises continuous glass fibers. Preferably, in the glass fiber reinforced thermosetting resin composite material, the mass fraction of the continuous glass fiber is 65-75%, and the rest is thermosetting resin. Preferably, the thermosetting resin is any one of epoxy resins, vinyl resins, and unsaturated polyesters. The forming method of the high-barrier glass fiber reinforced plastic composite pipe comprises the following steps: s1, extruding and granulating mixed raw materials of the lining pipe to obtain raw material particles, and extruding and molding the raw material particles into the lining pipe; S2, winding a composite aluminum foil on the outer surface of the li