A core-rolling tube production process and core-rolling tube

Abstract

The invention relates to the technical field of core-rolled tubes, and specifically to a core-rolled tube production process and a core-rolled tube. The core-rolled tube production process includes base tube layer winding, reinforcement layer winding, heating and curing, and fine processing. The base tube layer and the reinforcement layer are cured simultaneously, and the tube is not easy to be delaminated. The bending strength and compressive strength are high. Basalt fiber is added to the reinforcement layer. The basalt fiber content is high, so that the hardness of the tube surface is high, the wear resistance of the tube surface is improved, and the service life is extended. After the surface layer is re-coated, ground, and polished, the inherent surface defects of the winding process are compensated and the surface smoothness is improved. An antistatic agent is added to the dyeing agent for dyeing the basalt fiber, so that the antistatic agent can be evenly distributed on the surface of the basalt fiber, the conductivity continuity is good, and the conductivity performance is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of core-rolling tubes, and in particular to a core-rolling tube production process and a core-rolling tube. Background Art

[0002] FRP core tubes are mainly used for film core products that have high quality requirements on the surface smoothness and straightness of the tube core, including the winding of various vapor-deposited film products, paper products, sticker products, labels and other products.

[0003] The FRP core tube is divided into two parts: the base tube and the reinforcement layer. The wet winding process is commonly used in China.

[0004] Wet winding is to bundle the glass fiber, impregnate it with resin, and then directly wind it on the core mold under tension control, and then solidify it into shape. After solidification and molding, it is processed on a lathe, the base tube is roughened, cleaned and dried, mixed resin is applied, chopped strands are wound, mixed resin is applied, and glass fiber mat tape is wound. The operation is repeated according to thickness requirements, and finally mixed resin is applied, surface mat is wound, the surface is trimmed after solidification, and then polished to the required smoothness, etc. Antistatic agent is added to the mixed resin.

[0005] Disadvantages of this process:

[0006] There are bubbles and dry silk on the surface of the tube, which affect the smoothness and roughness;

[0007] Poor surface hardness, Shore hardness is lower than 85HD, insufficient wear resistance, affecting service life;

[0008] The base pipe and reinforcement layer are cured twice, which may lead to the risk of delamination, resulting in low bending and compressive strengths;

[0009] Antistatic agent is added to the mixed resin, and the overall antistatic property is average. Summary of the invention

[0010] In order to solve the above technical deficiencies, the present invention provides a core tube production process and a core tube, which have good surface finish, good wear resistance, are not easy to delaminate, have high bending strength and compressive strength, and have good antistatic properties.

[0011] In a first aspect, the present invention discloses a process for producing a core tube, comprising the following steps:

[0012] S1. Base tube layer: Apply release agent on the steel mandrel, fully contact and mix the No. 1 mixed resin and the glass fiber yarn in the impregnation tank, and use a winding machine to cross-wind the glass fiber yarn back and forth on the steel mandrel to the required outer diameter thickness. It should be noted that the outer diameter thickness can be measured at multiple positions by a vernier caliper, and the minimum value that meets the required outer diameter thickness is sufficient. The mass ratio of the No. 1 mixed resin to the glass fiber yarn is controlled by adjusting the tension and winding speed of the glass fiber yarn. The tension of the glass fiber yarn is 3~4 kg, and the winding speed of the glass fiber yarn is 12~18 meters per minute, so that the mass ratio of the No. 1 mixed resin to the glass fiber yarn is 25:75~30:70. The tighter the glass fiber yarn is, the faster the winding speed of the glass fiber yarn is, and the less the No. 1 mixed resin content on the glass fiber yarn is, and the winding angle of the glass fiber yarn is 55°~65°;

[0013] S2. Reinforcement layer: The basalt fiber yarn is dyed with a dye, that is, the basalt fiber yarn is soaked in the dye for 3 to 5 seconds, and an antistatic agent is added to the dye so that the dye and the antistatic agent can be evenly distributed on the surface of the basalt fiber. The dye can be a water-based polyurethane resin or a bisphenol A epoxy dye, and the antistatic agent type is a fatty alkyl imidazole salt derivative. The dyed basalt fiber yarn is dried, and then the basalt fiber yarn and the No. 2 mixed resin are fully contacted and mixed in the impregnation tank, and the basalt fiber yarn is crossed back and forth on the base tube layer using a winding machine. Winding to the required outer diameter thickness to form a blank, by adjusting the tension and winding speed of the basalt fiber yarn, to control the mass ratio of the No. 2 mixed resin to the basalt fiber yarn, the tension of the basalt fiber yarn is 3-4 kg, the winding speed of the basalt fiber yarn is 12-18 meters per minute, so that the mass ratio of the No. 2 mixed resin to the basalt fiber yarn is 25:75-30:70, the tighter the basalt fiber yarn is, the faster the winding speed of the basalt fiber yarn is, the less the No. 2 mixed resin content on the basalt fiber yarn is, and the winding angle of the basalt fiber yarn is 83°-85°;

[0014] S3. Curing: The blank is placed in an oven and heated by electric heating and blasting in a multi-stage manner. The heating is carried out in four stages. The temperature of the first stage is heated from room temperature to 85°C~95°C for 15 minutes. The second stage is kept at 85°C~95°C for 20 minutes. The third stage is heated from 85°C~95°C to 140°C~150°C for 15 minutes. The fourth stage is kept at 140°C~150°C for 3 hours. After drying and curing, the oven is opened and naturally cooled to room temperature before demoulding to obtain a preliminary product.

[0015] S4. Finishing: Cut the two ends of the preliminary product, turn it to the required size on a CNC lathe, then grind the outer surface on a grinder, and then polish the outer surface with a polishing machine. After polishing, apply epoxy coating on the outer surface again. After the epoxy coating is cured, grind and polish the outer surface.

[0016] Preferably, in S1, mixed resin No. 1 includes bisphenol A epoxy resin, curing agent, and accelerator, the mass ratio of bisphenol A epoxy resin, curing agent, and accelerator is 100:83:13, the tension of the glass fiber yarn is 3 kg, the winding speed of the glass fiber yarn is 12 meters per minute, the mass ratio of mixed resin No. 1 to glass fiber yarn is 30:70, the glass fiber yarn adopts direct untwisted roving, the linear density requirement is: 600~1200TEX, and the winding angle of the glass fiber yarn is 55°.

[0017] Preferably, in S2, the content of antistatic agent in the dye is 10%~15%, the moisture content of the dyed basalt fiber yarn after drying is less than 0.5%, the No. 2 mixed resin includes bisphenol A epoxy resin, curing agent, accelerator, and antistatic agent, the mass ratio of bisphenol A epoxy resin, curing agent, and accelerator is 100:83:13, the tension of the basalt fiber yarn is 3 kg, the winding speed of the basalt fiber yarn is 12 meters per minute, the mass ratio of the No. 2 mixed resin to the basalt fiber yarn is 30:70, the basalt fiber yarn adopts direct untwisted roving, the linear density requirement is: 400~1200TEX, and the winding angle of the basalt fiber yarn is 85°.

[0018] Preferably, in S4, the epoxy coating includes bisphenol A epoxy resin, a curing agent, an antistatic agent, and conductive carbon black, and the mass ratio of the bisphenol A epoxy resin, the curing agent, the antistatic agent, and the conductive carbon black is 100:28:6:2.

[0019] Furthermore, one or more of colorants, wear-resistant agents, antistatic agents, and anti-ultraviolet agents can be added to the No. 1 mixed resin in S1 as functional auxiliary materials, one or more of colorants, wear-resistant agents, conductive carbon powder, and anti-ultraviolet agents can be added to the No. 2 mixed resin in S2 as functional auxiliary materials, and one or more of promoters, colorants, wear-resistant agents, and anti-ultraviolet agents can be added to the epoxy coating in S4 as functional auxiliary materials.

[0020] In a second aspect, the present invention provides a winding core tube, comprising a base tube layer and a reinforcement layer, wherein the reinforcement layer is arranged on the outside of the base tube layer, the base tube layer comprises a No. 1 mixed resin and glass fiber yarn, the mass ratio of the No. 1 mixed resin to the glass fiber yarn is 25:75~30:70, and the winding angle of the glass fiber yarn in the base tube layer is 55°~65°, the reinforcement layer comprises basalt fiber yarn and a No. 2 mixed resin, an antistatic agent is evenly distributed on the surface of the basalt fiber in the basalt fiber yarn, the mass ratio of the No. 2 mixed resin to the basalt fiber yarn is 25:75~30:70, and the winding angle of the basalt fiber yarn in the reinforcement layer is 83°~85°.

[0021] The core-wound tube production process and the core-wound tube obtained by the present invention have the following beneficial effects: the base tube layer and the reinforcement layer are cured at the same time, are not easy to be delaminated, and have high bending strength and compressive strength; basalt fiber is added to the reinforcement layer, and the basalt fiber content is high, so that the Shore hardness value of the tube surface is as high as 88HD~89HD, the hardness is high, the wear resistance of the tube surface is improved, and the service life is extended; after the surface is re-coated, polished and polished, the inherent surface defects (dry wire, pits and other defects) of the winding process are compensated, and the surface finish is improved; an antistatic agent is added to the dyeing agent for dyeing the basalt fiber, so that the antistatic agent can be evenly distributed on the surface of the basalt fiber, the conductive continuity is good, the antistatic property is good, and the surface resistance of the tube body can be measured to be within 10 7 ~10 9 Between ohms. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the winding core tube of the present invention. DETAILED DESCRIPTION

[0023] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments. Example 1

[0024] In a first aspect, the present invention discloses a process for producing a core tube, comprising the following steps:

[0025] S1. Base pipe layer: Apply release agent on the steel core rod, the diameter of the steel core rod is 152.6 mm, and the No. 1 mixed resin and glass fiber yarn are fully contacted and mixed in the impregnation tank. The No. 1 mixed resin includes bisphenol A epoxy resin, curing agent, accelerator, colorant, wear-resistant agent, antistatic agent, and anti-ultraviolet agent. The mass ratio of bisphenol A epoxy resin, curing agent, and accelerator is 100:83:13. The bisphenol A epoxy resin, curing agent, and accelerator as a whole are mixed with colorant, wear-resistant agent, and antistatic agent. The mass ratio of the agent and the anti-ultraviolet agent is 95:5. The tension and winding speed of the glass fiber yarn are adjusted. The glass fiber yarn is wound back and forth on the steel core rod by a winding machine until the outer diameter is 163 mm. The tension of the glass fiber yarn is 4 kg. The winding speed of the glass fiber yarn is 18 meters per minute. The mass ratio of the No. 1 mixed resin to the glass fiber yarn is 25:75. The glass fiber yarn adopts direct untwisted roving, the linear density requirement is: 600TEX, and the winding angle of the glass fiber yarn is 65°.

[0026] S2. Reinforcement layer: The basalt fiber yarn is dyed with a dye, and an antistatic agent is added to the dye. The content of the antistatic agent in the dye is 10%, so that the dye and the antistatic agent can be evenly distributed on the surface of the basalt fiber. The dyed basalt fiber yarn is dried to make its moisture content less than 0.5%, and then the basalt fiber yarn is fully contacted and mixed with the No. 2 mixed resin in the impregnation tank. The No. 2 mixed resin includes bisphenol A type epoxy resin, curing agent, accelerator, antistatic agent, colorant, wear-resistant agent, conductive carbon powder, and anti-ultraviolet agent. The mass ratio of bisphenol A type epoxy resin, curing agent, and accelerator is 100:83:13. The mass ratio of bisphenol A epoxy resin, curing agent, accelerator as a whole to antistatic agent, colorant, wear-resistant agent, conductive carbon powder, and anti-ultraviolet agent as a whole is 95:5. The tension and winding speed of the basalt fiber yarn are adjusted. The basalt fiber yarn is wound back and forth on the base tube layer by a winding machine until the outer diameter is 171 mm to form a blank. The tension of the basalt fiber yarn is 4 kg, and the winding speed of the basalt fiber yarn is 18 meters per minute. The mass ratio of the second mixed resin to the basalt fiber yarn is 25:75. The basalt fiber yarn uses direct untwisted roving, and the linear density requirement is: 400TEX. The winding angle of the basalt fiber yarn is 83°.

[0027] S3. Curing: The blank is placed in an oven and heated by electric heating blast in a multi-stage manner. The heating is carried out in four stages. The temperature in the first stage is heated from room temperature to 85°C~95°C, the room temperature is controlled at 23°C, and the temperature is raised for 15 minutes. The second stage is kept at 85°C~95°C for 20 minutes. The third stage is heated from 85°C~95°C to 140°C~150°C, and the heating time is 15 minutes. The fourth stage is kept at 140°C~150°C for 3 hours. After drying and curing, the oven is opened and naturally cooled to room temperature, and then demolding is performed to obtain a preliminary product.

[0028] S4. Finishing: Cut the two ends of the preliminary product, turn it on a CNC lathe to the specified outer diameter, make its straightness less than 0.15 mm, the roundness less than 0.15 mm, and the outer diameter tolerance plus or minus 0.5 mm, then grind the outer surface on a grinder, and then polish the outer surface with a polishing machine. The surface roughness Ra after polishing is between 1.5 and 1.6. After polishing, apply epoxy coating on the outer surface again. The epoxy coating includes bisphenol A epoxy resin, curing agent, antistatic agent, and conductive carbon black. The mass ratio of bisphenol A epoxy resin, curing agent, antistatic agent, and conductive carbon black is 100:28:6:2. After the epoxy coating is cured, the outer surface is ground and polished, and the surface roughness Ra after polishing is between 0.5 and 1.5.

[0029] In a second aspect, the present invention provides a winding core tube, such as Figure 1As shown, it includes a base tube layer 1 and a reinforcement layer 2. The reinforcement layer 2 is arranged on the outside of the base tube layer 1. The base tube layer 1 includes a mixed resin No. 1 and glass fiber yarn. The mass ratio of the mixed resin No. 1 to the glass fiber yarn is 25:75. The winding angle of the glass fiber yarn in the base tube layer 1 is 65°. The reinforcement layer 2 includes basalt fiber yarn and a mixed resin No. 2. The surface of the basalt fiber in the basalt fiber yarn is evenly distributed with an antistatic agent. The mass ratio of the mixed resin No. 2 to the basalt fiber yarn is 25:75. The winding angle of the basalt fiber yarn in the reinforcement layer 2 is 83°. Example 2

[0030] In a first aspect, the present invention discloses a process for producing a core tube, comprising the following steps:

[0031] S1. Base tube layer: Apply a release agent on the steel mandrel, the diameter of the steel mandrel is 152.6 mm, and the No. 1 mixed resin and the glass fiber yarn are fully contacted and mixed in the impregnation tank. The No. 1 mixed resin includes bisphenol A epoxy resin, curing agent, accelerator, colorant, and antistatic agent. The mass ratio of bisphenol A epoxy resin, curing agent, and accelerator is 100:83:13, and the mass ratio of bisphenol A epoxy resin, curing agent, and accelerator as a whole to colorant and antistatic agent as a whole is 95:5. Adjust the tension and winding speed of the glass fiber yarn, and use a winding machine to cross-wind the glass fiber yarn back and forth on the steel mandrel until the outer diameter is 163 mm, so that the mass ratio of No. 1 mixed resin to glass fiber yarn is 28:72. The glass fiber yarn uses direct untwisted roving, and the linear density requirement is: 900TEX. The winding angle of the glass fiber yarn is 60°;

[0032] S2. Reinforcement layer: The basalt fiber yarn is dyed with a dye, and an antistatic agent is added to the dye. The content of the antistatic agent in the dye is 13%, so that the dye and the antistatic agent can be evenly distributed on the surface of the basalt fiber. The dyed basalt fiber yarn is dried to make its moisture content less than 0.5%. Then, the basalt fiber yarn is fully contacted and mixed with the No. 2 mixed resin in the impregnation tank. The No. 2 mixed resin includes bisphenol A type epoxy resin, curing agent, accelerator, antistatic agent, wear-resistant agent, conductive carbon powder, and anti-ultraviolet agent. Bisphenol A type epoxy resin, curing agent, accelerator The mass ratio of the feed agent is 100:83:13, the mass ratio of bisphenol A epoxy resin, curing agent, accelerator as a whole to antistatic agent, wear-resistant agent, conductive carbon powder, and anti-ultraviolet agent as a whole is 95:5, the tension and winding speed of the basalt fiber yarn are adjusted, and the basalt fiber yarn is wound back and forth on the base tube layer by a winding machine to form a blank with an outer diameter of 171 mm, so that the mass ratio of the second mixed resin to the basalt fiber yarn is 28:72, the basalt fiber yarn uses direct untwisted roving, the linear density requirement is: 800TEX, and the winding angle of the basalt fiber yarn is 84°;

[0033] S3. Curing: The blank is placed in an oven and heated by electric heating blast in a multi-stage manner. The heating is carried out in four stages. The temperature in the first stage is heated from room temperature to 85°C~95°C, the room temperature is controlled at 23°C, and the temperature is raised for 15 minutes. The second stage is kept at 85°C~95°C for 20 minutes. The third stage is heated from 85°C~95°C to 140°C~150°C, and the heating time is 15 minutes. The fourth stage is kept at 140°C~150°C for 3 hours. After drying and curing, the oven is opened and naturally cooled to room temperature, and then demolding is performed to obtain a preliminary product.

[0034] S4. Finishing: Cut the two ends of the preliminary product, turn it on a CNC lathe to the specified outer diameter, make its straightness less than 0.15 mm, the roundness less than 0.15 mm, and the outer diameter tolerance plus or minus 0.5 mm, then grind the outer surface on a grinder, and then polish the outer surface with a polishing machine. The surface roughness Ra after polishing is between 1.5 and 1.6. After polishing, apply epoxy coating on the outer surface again. The epoxy coating includes bisphenol A epoxy resin, curing agent, antistatic agent, and conductive carbon black. The mass ratio of bisphenol A epoxy resin, curing agent, antistatic agent, and conductive carbon black is 100:28:6:2. After the epoxy coating is cured, the outer surface is ground and polished, and the surface roughness Ra after polishing is between 0.5 and 1.5.

[0035] In a second aspect, the present invention provides a winding core tube, such as Figure 1 As shown, it includes a base tube layer 1 and a reinforcement layer 2. The reinforcement layer 2 is arranged on the outside of the base tube layer 1. The base tube layer 1 includes a mixed resin No. 1 and glass fiber yarn. The mass ratio of the mixed resin No. 1 to the glass fiber yarn is 28:72. The winding angle of the glass fiber yarn in the base tube layer 1 is 60°. The reinforcement layer 2 includes basalt fiber yarn and a mixed resin No. 2. The surface of the basalt fiber in the basalt fiber yarn is evenly distributed with an antistatic agent. The mass ratio of the mixed resin No. 2 to the basalt fiber yarn is 28:72. The winding angle of the basalt fiber yarn in the reinforcement layer 2 is 84°. Example 3

[0036] In a first aspect, the present invention discloses a process for producing a core tube, comprising the following steps:

[0037] S1. Base tube layer: Apply release agent on the steel mandrel, the diameter of the steel mandrel is 152.6 mm, No. 1 mixed resin and glass fiber yarn are fully contacted and mixed in the impregnation tank, No. 1 mixed resin includes bisphenol A type epoxy resin, curing agent, and accelerator, and the mass ratio of bisphenol A type epoxy resin, curing agent, and accelerator is 100:83:13, adjust the tension and winding speed of the glass fiber yarn, use a winding machine to cross-wind the glass fiber yarn back and forth on the steel mandrel until the outer diameter is 163 mm, the tension of the glass fiber yarn is 3 kg, the winding speed of the glass fiber yarn is 12 meters per minute, so that the mass ratio of No. 1 mixed resin to glass fiber yarn is 30:70, the glass fiber yarn uses direct untwisted roving, the linear density requirement is: 1200TEX, and the winding angle of the glass fiber yarn is 55°;

[0038] S2. Reinforcement layer: The basalt fiber yarn is dyed with a dye, and an antistatic agent is added to the dye. The content of the antistatic agent in the dye is 15%, so that the dye and the antistatic agent can be evenly distributed on the surface of the basalt fiber. The dyed basalt fiber yarn is dried to make its moisture content less than 0.5%, and then the basalt fiber yarn is fully contacted and mixed with the No. 2 mixed resin in the impregnation tank. The No. 2 mixed resin includes bisphenol A epoxy resin, curing agent, accelerator, and antistatic agent. The mass ratio of bisphenol A epoxy resin, curing agent, and accelerator is 100:83 :13, the mass ratio of bisphenol A epoxy resin, curing agent, accelerator and antistatic agent is 95:5, the tension of basalt fiber yarn is adjusted, and the basalt fiber yarn is wound back and forth on the base tube layer by a winding machine until the outer diameter is 171 mm to form a blank, the tension of basalt fiber yarn is 3 kg, the winding speed of basalt fiber yarn is 12 meters per minute, and the mass ratio of No. 2 mixed resin to basalt fiber yarn is 30:70. The basalt fiber yarn adopts direct untwisted roving, the linear density requirement is: 1200TEX, and the winding angle of basalt fiber yarn is 85°;

[0039] S3. Curing: The blank is placed in an oven and heated by electric heating blast in a multi-stage manner. The heating is carried out in four stages. The temperature in the first stage is heated from room temperature to 85°C~95°C, the room temperature is controlled at 23°C, and the temperature is raised for 15 minutes. The second stage is kept at 85°C~95°C for 20 minutes. The third stage is heated from 85°C~95°C to 140°C~150°C, and the heating time is 15 minutes. The fourth stage is kept at 140°C~150°C for 3 hours. After drying and curing, the oven is opened and naturally cooled to room temperature, and then demolding is performed to obtain a preliminary product.

[0040] S4. Finishing: Cut the two ends of the preliminary product, turn it on a CNC lathe to the specified outer diameter, make its straightness less than 0.15 mm, the roundness less than 0.15 mm, and the outer diameter tolerance plus or minus 0.5 mm, then grind the outer surface on a grinder, and then polish the outer surface with a polishing machine. The surface roughness Ra after polishing is between 1.5 and 1.6. After polishing, apply epoxy coating on the outer surface again. The epoxy coating includes bisphenol A epoxy resin, curing agent, antistatic agent, and conductive carbon black. The mass ratio of bisphenol A epoxy resin, curing agent, antistatic agent, and conductive carbon black is 100:28:6:2. After the epoxy coating is cured, the outer surface is ground and polished, and the surface roughness Ra after polishing is between 0.5 and 1.5.

[0041] In a second aspect, the present invention provides a winding core tube, such as Figure 1 As shown, it includes a base tube layer 1 and a reinforcement layer 2, wherein the reinforcement layer 2 is arranged on the outside of the base tube layer 1, the base tube layer 1 includes a mixed resin No. 1 and glass fiber yarn, the mass ratio of the mixed resin No. 1 to the glass fiber yarn is 30:70, and the winding angle of the glass fiber yarn in the base tube layer 1 is 55°, and the reinforcement layer 2 includes basalt fiber yarn and a mixed resin No. 2, and the antistatic agent is evenly distributed on the surface of the basalt fiber in the basalt fiber yarn, the mass ratio of the mixed resin No. 2 to the basalt fiber yarn is 30:70, and the winding angle of the basalt fiber yarn in the reinforcement layer 2 is 85°.

Claims

1. A process for producing a core tube, characterized in that: The following steps are involved: S1. Base tube layer: a release agent is applied to the steel mandrel, the No. 1 mixed resin and the glass fiber yarn are fully contacted and mixed in the impregnation tank, and the glass fiber yarn is wound back and forth on the steel mandrel by a winding machine to the required outer diameter thickness. The mass ratio of the No. 1 mixed resin to the glass fiber yarn is controlled by adjusting the tension and winding speed of the glass fiber yarn. The tension of the glass fiber yarn is 3-4 kg, and the winding speed of the glass fiber yarn is 12-18 meters per minute. The mass ratio of the No. 1 mixed resin to the glass fiber yarn is 25:75-30:70, and the winding angle of the glass fiber yarn is 55°-65°; S2. Reinforcement layer: the basalt fiber yarn is dyed with a dye, an antistatic agent is added to the dye, so that the dye and the antistatic agent can be evenly distributed on the surface of the basalt fiber, the dyed basalt fiber yarn is dried, and then the basalt fiber yarn and the No. 2 mixed resin are fully contacted and mixed in the impregnation tank, and the basalt fiber yarn is cross-wound back and forth on the base tube layer to the required outer diameter thickness by a winding machine to form a blank, and the mass ratio of the No. 2 mixed resin to the basalt fiber yarn is controlled by adjusting the tension and winding speed of the basalt fiber yarn. The tension of the basalt fiber yarn is 3-4 kg, and the winding speed of the basalt fiber yarn is 12-18 meters per minute, so that the mass ratio of the No. 2 mixed resin to the basalt fiber yarn is 25:75-30:70, and the winding angle of the basalt fiber yarn is 83°-85°; S3. Curing: The blank is placed in an oven and heated by electric heating and blasting in a multi-stage manner. The heating is carried out in four stages. The temperature of the first stage is heated from room temperature to 85°C~95°C for 15 minutes. The second stage is kept at 85°C~95°C for 20 minutes. The third stage is heated from 85°C~95°C to 140°C~150°C for 15 minutes. The fourth stage is kept at 140°C~150°C for 3 hours. After drying and curing, the oven is opened and naturally cooled to room temperature before demoulding to obtain a preliminary product. S4. Finishing: Cut the two ends of the preliminary product, turn it to the required size on a CNC lathe, then grind the outer surface on a grinder, and then polish the outer surface with a polishing machine. After polishing, apply epoxy coating on the outer surface again. After the epoxy coating is cured, grind and polish the outer surface.

2. A process for producing a core tube according to claim 1, characterized in that: In S1, mixed resin No. 1 includes bisphenol A epoxy resin, curing agent, and accelerator. The mass ratio of bisphenol A epoxy resin, curing agent, and accelerator is 100:83:

13. The tension of the glass fiber yarn is 3 kg, the winding speed of the glass fiber yarn is 12 meters per minute, the mass ratio of mixed resin No. 1 to glass fiber yarn is 30:70, and the glass fiber yarn adopts direct untwisted roving. The linear density requirement is: 600~1200TEX, and the winding angle of the glass fiber yarn is 55°.

3. A process for producing a core tube according to claim 1 or 2, characterized in that: In S2, the content of antistatic agent in the dye is 10%~15%, the moisture content of the dyed basalt fiber yarn after drying is less than 0.5%, the No. 2 mixed resin includes bisphenol A epoxy resin, curing agent, accelerator, and antistatic agent, the mass ratio of bisphenol A epoxy resin, curing agent, and accelerator is 100:83:13, the tension of the basalt fiber yarn is 3 kg, the winding speed of the basalt fiber yarn is 12 meters per minute, the mass ratio of No. 2 mixed resin to basalt fiber yarn is 30:70, the basalt fiber yarn adopts direct untwisted roving, the linear density requirement is: 400~1200TEX, and the winding angle of the basalt fiber yarn is 85°.

4. A process for producing a core tube according to claim 3, characterized in that: In S4, the epoxy coating includes bisphenol A epoxy resin, a curing agent, an antistatic agent, and conductive carbon black, and the mass ratio of the bisphenol A epoxy resin, the curing agent, the antistatic agent, and the conductive carbon black is 100:28:6:

2.

5. A process for producing a core tube according to claim 4, characterized in that: The No. 1 mixed resin in S1 can be added with one or more of colorants, wear resistors, antistatic agents, and anti-ultraviolet agents as functional auxiliary materials, the No. 2 mixed resin in S2 can be added with one or more of colorants, wear resistors, conductive carbon powder, and anti-ultraviolet agents as functional auxiliary materials, and the epoxy coating in S4 can be added with one or more of promoters, colorants, wear resistors, and anti-ultraviolet agents as functional auxiliary materials.

6. A core tube, characterized in that: The invention comprises a base tube layer and a reinforcement layer, wherein the reinforcement layer is arranged on the outer side of the base tube layer, the base tube layer comprises a No. 1 mixed resin and glass fiber yarn, the mass ratio of the No. 1 mixed resin to the glass fiber yarn is 25:75-30:70, and the winding angle of the glass fiber yarn in the base tube layer is 55°-65°; the reinforcement layer comprises a basalt fiber yarn and a No. 2 mixed resin, an antistatic agent is evenly distributed on the surface of the basalt fiber in the basalt fiber yarn, the mass ratio of the No. 2 mixed resin to the basalt fiber yarn is 25:75-30:70, and the winding angle of the basalt fiber yarn in the reinforcement layer is 83°-85°.

Images