High-performance centrifugal pipeline lining resin and preparation method thereof

Abstract

The invention discloses high-performance centrifugal pipeline lining resin and a preparation method thereof, and relates to the technical field of composite materials. According to the invention, 40-60 parts of epoxy resin, 15-25 parts of furan resin, 10-20 parts of vinyl ester resin, 5-10 parts of an active diluent, 3-8 parts of nano-silica, 5-15 parts of carbon fiber chopped strands, 5-10 parts of a modified amine curing agent, 5-10 parts of a peroxide-initiated curing agent, 1-3 parts of an accelerator, 0.5-1 part of a defoaming agent and 0.3-0.8 part of a leveling agent are adopted. A nano reinforcing material is introduced, and a curing process is optimized, so that low shrinkage, high bonding strength and chemical corrosion resistance are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials, and in particular to a high-performance centrifugal pipe lining resin and a preparation method thereof. Background Art

[0002] In the petroleum, chemical, electric power, and mining industries, pipeline systems that transport corrosive media, high-temperature fluids, or solid particles place extremely high demands on the performance of lining materials. Traditional pipeline lining materials, such as metal linings (stainless steel and alloy steel), are resistant to high pressure but are costly and prone to corrosion. Rubber linings offer flexibility but lack wear and temperature resistance. Ordinary epoxy or unsaturated polyester resins, while corrosion-resistant, are brittle and have poor impact resistance, making them difficult to adapt to environments with high-speed fluids or particle erosion. Furthermore, the centrifugal molding process places higher demands on the resin's fluidity, curing speed, and bonding strength. Existing resin systems often suffer from high curing shrinkage, uneven filler dispersion, or insufficient interfacial bonding strength, leading to delamination, cracking, or shedding of the lining, impacting the pipeline's service life. Summary of the Invention

[0003] The purpose of the present invention is to address the defects and shortcomings of the existing technology and provide a high-performance centrifugal pipe lining resin and its preparation method with reasonable design and easy use. By modifying the epoxy and furan composite system, introducing nano-reinforced materials, and optimizing the curing process, low shrinkage, high bonding strength and chemical corrosion resistance are achieved.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: it comprises the following components by weight: 40-60 parts of epoxy resin, 15-25 parts of furan resin, 10-20 parts of vinyl ester resin, 5-10 parts of reactive diluent, 3-8 parts of nano-silica, 5-15 parts of carbon fiber chopped strands, 5-10 parts of modified amine curing agent, 5-10 parts of peroxide-initiated curing, 1-3 parts of accelerator, 0.5-1 part of defoaming agent, and 0.3-0.8 part of leveling agent.

[0005] As a further improvement of the present invention, the epoxy resin is E-51 epoxy resin, the reactive diluent is butyl glycidyl ether, the modified amine curing agent is a composite of TETA and polyetheramine, the accelerator is 2,4,6-tris(dimethylaminomethyl)phenol, the defoaming agent is silicone, and the leveling agent is acrylate.

[0006] As a further improvement of the present invention, the length of the carbon fiber chopped strands is 0.1-0.5 mm.

[0007] As a further improvement of the present invention, the epoxy resin is 40 parts, the furan resin is 20 parts, the vinyl ester resin is 15 parts, the reactive diluent is 5 parts, the nano-silica is 3 parts, the carbon fiber chopped strands are 10 parts, the modified amine curing agent is 6 parts, the peroxide-initiated curing is 7 parts, the accelerator is 2 parts, the defoaming agent is 0.7 parts, and the leveling agent is 0.5 parts.

[0008] As a further improvement of the present invention, the epoxy resin is 50 parts, the furan resin is 15 parts, the vinyl ester resin is 18 parts, the reactive diluent is 8 parts, the nano-silica is 5 parts, the carbon fiber chopped strands are 15 parts, the modified amine curing agent is 8 parts, the peroxide-initiated curing is 5 parts, the accelerator is 1 part, the defoaming agent is 0.8 parts, and the leveling agent is 0.6 parts.

[0009] As a further improvement of the present invention, the epoxy resin is 60 parts, the furan resin is 10 parts, the vinyl ester resin is 20 parts, the reactive diluent is 10 parts, the nano-silica is 8 parts, the carbon fiber chopped strands are 5 parts, the modified amine curing agent is 10 parts, the peroxide-initiated curing is 9 parts, the accelerator is 3 parts, the defoaming agent is 1 part, and the leveling agent is 0.8 parts.

[0010] A method for preparing a high-performance centrifugal pipe lining resin comprises the following processing steps: Step 1: Premix the matrix resin: Epoxy resin, furan resin, vinyl ester resin, and reactive diluent were weighed in parts by weight, stirred and mixed at 60° C. for 30 minutes, and vacuum degassed to form a matrix resin; Step 2: Filler dispersion: Weigh nano-silica and carbon fiber chopped strands by weight, add them to an ethanol solvent, and ultrasonically disperse them for 20 minutes. After drying, mix them with the matrix resin in step 1; Step 3, curing system addition: Cool the base resin in step 1 to 40°C, then weigh the modified amine curing agent, peroxide initiator curing and accelerator by weight and squeeze them into the base resin. Add the defoamer and leveling agent by weight during low-speed stirring to avoid bubble formation; Step 4: Centrifugal Forming: The mixed resin obtained in step 3 is injected into the rotating metal pipe. The centrifugal force makes the resin spread evenly and removes bubbles. Finally, a step-by-step temperature rise curing method is used to form a dense lining layer.

[0011] As a further improvement of the present invention, the metal pipe rotates at a speed of 300-800 rpm.

[0012] As a further improvement of the present invention, the step temperature of the lining curing is 80°C / 2h→120°C / 1h→150°C / 1h.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The epoxy resin, furan resin and vinyl ester ternary resin system combines corrosion resistance, mechanical strength and toughness, while nano-silica and carbon fiber synergistically enhance wear resistance and impact resistance; 2. Active diluent adjusts viscosity, and centrifugal molding combined with step curing ensures bubble-free and high-density lining, making it suitable for complex pipeline structures; 3. The dual curing mechanism formed by modified amine curing agent and peroxide-induced curing has controllable curing rate and complete deep curing to avoid cracking defects; 4. Carbon fiber chopped strands are locally reinforced to reduce usage; the raw material ratio is optimized to balance performance and cost, making it suitable for industrial-scale production. DETAILED DESCRIPTION

[0014] Example 1: The technical solution adopted in this example is: it comprises the following ingredients in parts by weight: 40 parts of epoxy resin, 20 parts of furan resin, 15 parts of vinyl ester resin, 5 parts of reactive diluent, 3 parts of nano-silica, 10 parts of carbon fiber chopped strands, 6 parts of modified amine curing agent, 7 parts of peroxide-initiated curing, 2 parts of accelerator, 0.7 parts of defoaming agent, and 0.5 parts of leveling agent.

[0015] A method for preparing a high-performance centrifugal pipe lining resin comprises the following processing steps: Step 1: Premix the matrix resin: Weigh 40 parts of E-51 epoxy resin, 20 parts of furan resin, 15 parts of vinyl ester resin, and 5 parts of reactive diluent (butyl glycidyl ether) by weight, stir and mix at 60° C. for 30 minutes, and perform vacuum degassing to form a matrix resin; Step 2: Filler dispersion: Weigh 3 parts of nano-silica and 10 parts of carbon fiber chopped strands by weight, add them to an ethanol solvent, and ultrasonically disperse them for 20 minutes. After drying, mix them with the matrix resin in step 1. The length of the carbon fiber chopped strands is 0.1-0.5 mm. Step 3, curing system addition: The base resin in step 1 is cooled to 40°C, and then 6 parts of a modified amine curing agent, 7 parts of a peroxide-initiated curing agent, and 2 parts of an accelerator are weighed and squeezed into the base resin. The accelerator is 2,4,6-tris(dimethylaminomethyl)phenol. During low-speed stirring, 0.7 parts of a defoamer and 0.5 parts of a leveling agent are added by weight. The defoamer is a silicone type, and the leveling agent is an acrylate type to prevent bubble formation. Step 4: Centrifugal Forming: The mixed resin obtained in step 3 is injected into a rotating metal pipe. The metal pipe rotates at a speed of 300-800 rpm. The centrifugal force causes the resin to spread evenly and expel bubbles. Finally, a dense lining layer is formed by a step-by-step temperature curing method. The step-by-step temperature of the lining curing is 80°C / 2h→120°C / 1h→150°C / 1h.

[0016] Example 2: The technical solution adopted in this example is: it contains the following ingredients in parts by weight: 50 parts of epoxy resin, 15 parts of furan resin, 18 parts of vinyl ester resin, 8 parts of reactive diluent, 5 parts of nano-silica, 15 parts of carbon fiber chopped strands, 8 parts of modified amine curing agent, 5 parts of peroxide-initiated curing, 1 part of accelerator, 0.8 parts of defoaming agent, and 0.6 parts of leveling agent.

[0017] A method for preparing a high-performance centrifugal pipe lining resin comprises the following processing steps: Step 1: Premix the matrix resin: Weigh 50 parts of E-51 epoxy resin, 15 parts of furan resin, 18 parts of vinyl ester resin, and 8 parts of reactive diluent, wherein the reactive diluent is butyl glycidyl ether, and stir and mix them at 60° C. for 30 minutes, and perform vacuum degassing to form a matrix resin; Step 2: Filler dispersion: Weigh 5 parts of nano-silica and 15 parts of carbon fiber chopped strands by weight, add them to an ethanol solvent, and ultrasonically disperse them for 20 minutes. After drying, mix them with the matrix resin in step 1. The length of the carbon fiber chopped strands is 0.1-0.5 mm. Step 3, curing system addition: The base resin in step 1 is cooled to 40°C, and then 8 parts of a modified amine curing agent, 5 parts of a peroxide-initiated curing agent, and 1 part of an accelerator are weighed and squeezed into the base resin. The accelerator is 2,4,6-tris(dimethylaminomethyl)phenol. During low-speed stirring, 0.8 parts of a defoamer and 0.6 parts of a leveling agent are added by weight. The defoamer is a silicone type, and the leveling agent is an acrylate type to avoid bubble formation. Step 4: Centrifugal Forming: The mixed resin obtained in step 3 is injected into a rotating metal pipe. The metal pipe rotates at a speed of 300-800 rpm. The centrifugal force causes the resin to spread evenly and expel bubbles. Finally, a dense lining layer is formed by a step-by-step temperature curing method. The step-by-step temperature of the lining curing is 80°C / 2h→120°C / 1h→150°C / 1h.

[0018] Example 3: The technical solution adopted in this example is: it contains the following ingredients in parts by weight: 60 parts of epoxy resin, 10 parts of furan resin, 20 parts of vinyl ester resin, 10 parts of reactive diluent, 8 parts of nano-silica, 5 parts of carbon fiber chopped strands, 10 parts of modified amine curing agent, 9 parts of peroxide-initiated curing, 3 parts of accelerator, 1 part of defoaming agent, and 0.8 parts of leveling agent.

[0019] A method for preparing a high-performance centrifugal pipe lining resin comprises the following processing steps: Step 1: Premix the matrix resin: Weigh 60 parts of E-51 epoxy resin, 10 parts of furan resin, 20 parts of vinyl ester resin, and 10 parts of reactive diluent, wherein the reactive diluent is butyl glycidyl ether, and stir and mix them at 60° C. for 30 minutes, and perform vacuum degassing to form a matrix resin; Step 2: Filler dispersion: 8 parts of nano-silica and 5 parts of carbon fiber chopped strands were weighed by weight and added to an ethanol solvent, and ultrasonically dispersed for 20 minutes. After drying, the mixture was mixed with the matrix resin in step 1. The length of the carbon fiber chopped strands was 0.1-0.5 mm. Step 3, curing system addition: The base resin in step 1 is cooled to 40°C, and then 10 parts of a modified amine curing agent, 9 parts of a peroxide-initiated curing agent, and 3 parts of an accelerator are weighed and squeezed into the base resin. The accelerator is 2,4,6-tris(dimethylaminomethyl)phenol. During low-speed stirring, 1 part of a defoamer and 0.8 parts of a leveling agent are added by weight. The defoamer is a silicone type, and the leveling agent is an acrylate type to avoid bubble formation. Step 4: Centrifugal Forming: The mixed resin obtained in step 3 is injected into a rotating metal pipe. The metal pipe rotates at a speed of 300-800 rpm. The centrifugal force causes the resin to spread evenly and expel bubbles. Finally, a dense lining layer is formed by a step-by-step temperature curing method. The step-by-step temperature of the lining curing is 80°C / 2h→120°C / 1h→150°C / 1h.

[0020] Compared with the prior art, the beneficial effects of this specific embodiment are as follows: 1. The epoxy resin, furan resin and vinyl ester ternary resin system combines corrosion resistance, mechanical strength and toughness, while nano-silica and carbon fiber synergistically enhance wear resistance and impact resistance; 2. Active diluent adjusts viscosity, and centrifugal molding combined with step curing ensures bubble-free and high-density lining, making it suitable for complex pipeline structures; 3. The dual curing mechanism formed by modified amine curing agent and peroxide-induced curing has controllable curing rate and complete deep curing to avoid cracking defects; 4. Carbon fiber chopped strands are locally reinforced to reduce usage; the raw material ratio is optimized to balance performance and cost, making it suitable for industrial-scale production.

[0021] For those skilled in the art, they can modify the technical solutions described in the aforementioned embodiments and make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-performance centrifugal pipe lining resin, characterized by: The invention comprises the following components in parts by weight: 40-60 parts of epoxy resin, 15-25 parts of furan resin, 10-20 parts of vinyl ester resin, 5-10 parts of active diluent, 3-8 parts of nano-silicon dioxide, 5-15 parts of carbon fiber chopped strands, 5-10 parts of modified amine curing agent, 5-10 parts of peroxide-initiated curing, 1-3 parts of accelerator, 0.5-1 part of defoaming agent and 0.3-0.8 part of leveling agent.

2. The high-performance centrifugal pipe lining resin according to claim 1, characterized in that: The epoxy resin is E-51 epoxy resin, the active diluent is butyl glycidyl ether, the modified amine curing agent is a composite of TETA and polyetheramine, the accelerator is 2,4,6-tris(dimethylaminomethyl)phenol, the defoaming agent is silicone, and the leveling agent is acrylate.

3. The high-performance centrifugal pipe lining resin according to claim 1, characterized in that: The length of the carbon fiber chopped strands is 0.1-0.5 mm.

4. The high-performance centrifugal pipe lining resin according to claim 1, characterized in that: The epoxy resin is 40 parts, the furan resin is 20 parts, the vinyl ester resin is 15 parts, the reactive diluent is 5 parts, the nano-silica is 3 parts, the carbon fiber chopped strands are 10 parts, the modified amine curing agent is 6 parts, the peroxide initiated curing is 7 parts, the accelerator is 2 parts, the defoaming agent is 0.7 parts, and the leveling agent is 0.5 parts.

5. The high-performance centrifugal pipe lining resin according to claim 1, characterized in that: The epoxy resin is 50 parts, the furan resin is 15 parts, the vinyl ester resin is 18 parts, the reactive diluent is 8 parts, the nano-silica is 5 parts, the carbon fiber chopped strands are 15 parts, the modified amine curing agent is 8 parts, the peroxide initiated curing is 5 parts, the accelerator is 1 part, the defoaming agent is 0.8 parts, and the leveling agent is 0.6 parts.

6. The high-performance centrifugal pipe lining resin according to claim 1, characterized in that: The epoxy resin is 60 parts, the furan resin is 10 parts, the vinyl ester resin is 20 parts, the reactive diluent is 10 parts, the nano-silica is 8 parts, the carbon fiber chopped strands are 5 parts, the modified amine curing agent is 10 parts, the peroxide initiated curing is 9 parts, the accelerator is 3 parts, the defoaming agent is 1 part, and the leveling agent is 0.8 parts.

7. A method for preparing a high-performance centrifugal pipe lining resin, characterized by: It includes the following processing steps: Step (1), premixing the matrix resin: Epoxy resin, furan resin, vinyl ester resin, and reactive diluent were weighed in parts by weight, stirred and mixed at 60° C. for 30 minutes, and vacuum degassed to form a matrix resin; Step (2), filler dispersion: Weigh nano-silica and carbon fiber chopped strands by weight, add them to an ethanol solvent, and ultrasonically disperse them for 20 minutes. After drying, mix them with the matrix resin in step (1); Step (3), adding the curing system: The base resin in step (1) is cooled to 40°C, and then the modified amine curing agent, peroxide initiator curing and accelerator are weighed by weight and squeezed into the base resin. During the low-speed stirring process, a defoamer and a leveling agent are added by weight to avoid bubble formation; Step (4), centrifugal molding: The mixed resin obtained in step (3) is injected into the rotating metal pipe. The centrifugal force makes the resin spread evenly and removes bubbles. Finally, a step-by-step temperature rise curing method is used to form a dense lining layer.

8. The high-performance centrifugal pipe lining resin and preparation method thereof according to claim 1, characterized in that: The metal pipe rotates at a speed of 300-800 rpm.

9. The high-performance centrifugal pipe lining resin and preparation method thereof according to claim 1, characterized in that: The step temperature of the lining curing is 80°C / 2h→120°C / 1h→150°C / 1h.