CN104441683A - Manufacturing method of insulating cylinder and pipe fitting made from fiber composite material - Google Patents

Abstract

The invention discloses a method for manufacturing a fiber composite insulating cylinder and a pipe fitting, which is characterized in that the method includes fiber dipping, fiber bundle winding tension setting, fiber bundle winding, heating and curing, and outer surface light curing. The manufacturing cost of the fiber composite material manufactured by the method of the invention is lower than that of the prior art by more than 30%, and the electrical properties and mechanical properties of the material are better than the fiber composite material manufactured by the prior art.

Description

A kind of manufacturing method of fiber composite insulation cylinder and pipe fittings

technical field

The invention relates to a method for manufacturing insulating cylinders and pipe fittings in the power grid industry, in particular to a method for manufacturing insulating cylinders and pipe fittings made of fiber composite materials.

Background technique

At present, the composite insulating materials used in domestic ultra-high voltage electrical appliances, high-voltage switches and high-voltage test transformers, especially in the field of manufacturing large-length-to-diameter, large-diameter, and super-long pipe fittings, mainly use ordinary glass fibers and single-structure bisphenol A rings. Oxygen resin composite molding. In the manufacturing process, a large metal core mold is required, which is heavy, has a long processing cycle, is expensive, and requires a large demoulding device, so its production cost is high and the efficiency is low; before fiber winding, the mandrel needs to be evenly coated with a mold release agent , to help smooth demoulding, but in actual operation, the uneven application of the demoulding agent often causes many production accidents such as difficulty in demoulding, inability to demould, or scratches on the inner wall of the demoulding; The solvent release agent will increase the processing cost, complicate the production molding process, increase uncontrollability, and poor quality stability.

Contents of the invention

The object of the present invention is to provide a method for manufacturing a fiber composite insulation cylinder and a pipe fitting.

The technical solution of the present invention is: a method for manufacturing a fiber composite insulating cylinder and a pipe fitting, which is characterized in that the method includes the following process steps:

A. Fiber dipping, put the glue in the glue tank, heat it to 20-40°C, the viscosity is 0.2-1.0Pa·s, after the fibers are bundled, immerse in the glue from one end of the glue tank and slowly to the other end of the glue tank Move to the outside of the tank, control the moving speed of cellulose to 0.2-0.9 m/min, and the glue content is between 15%-30%;

B. Fiber bundle winding tension setting, the initial tension is selected according to 5%-10% of fiber strength, in spiral winding and plane winding, the tension of fiber bundle is controlled at 0.45-1.8 kg, in radial winding, the fiber bundle The tension is controlled at 2.7-3.6 kg;

C. Winding of fiber bundles. The fiber bundles after dipping are wound longitudinally and circumferentially in a cross-helical manner using a winding machine. The winding angle of the circumferential winding is between 85°-90°, and the winding angle of the longitudinal winding is 15° or 30°. Or 45°, the maximum winding speed does not exceed 0.9 m/s, and the winding forms a semi-finished product;

D. Heating and curing. Use an infrared heating device to heat and cure the semi-finished product. Keep the semi-finished product slowly rotating during heating. Under the heating condition of 30-80°C, the heating and curing time is 30-80 minutes;

E. Light curing of the outer surface: Apply the light curing agent evenly on the outer surface of the semi-finished product after heating and curing, repeatedly compact with rubber rollers to discharge the air, and then irradiate with ultraviolet light source for 15-30 seconds until hardening.

The fibers mentioned above are carbon fibers or glass fibers.

The invention adopts fiber winding and rapid solidification molding process, so that the manufacture of fiber composite ultra-high-voltage electrical appliances, high-voltage switches and high-voltage test transformers, especially large-length-to-diameter ratio, large-diameter, and super-long pipes, does not need to use large mandrels and demoulding agent, thereby improving production efficiency, reducing manufacturing costs, and reducing labor intensity. The manufacturing cost of the fiber composite material manufactured by the method of the invention is lower than that of the prior art by more than 30%, and the electrical properties and mechanical properties of the material are better than the fiber composite material manufactured by the prior art.

Detailed ways

Example 1:

A. Put the glue solution prepared by mixing special bisphenol A, bisphenol F epoxy resin, toughener, modifier, accelerator, and diluent with a viscosity of 0.4 Pa·s in the glue tank. After the carbon fiber low-twisted yarn is bundled, it is immersed in the glue solution from one end of the glue tank and slowly moves to the other end of the glue tank to the outside of the tank. The moving speed of the cellulose is controlled at 0.5 m/min, and the glue content is 20%.

B. The fiber bundle after dipping is controlled by a multi-dimensional computer winding machine for longitudinal and circumferential cross-helical winding, the winding angle of the circumferential winding is controlled at 85°, the winding angle of the longitudinal winding is controlled at 15°, and the winding speed is 0.7 m/ Second; in spiral winding and planar winding, the tension of the fiber bundle is controlled at 1 kg, in radial winding, the tension of the fiber bundle is controlled at 3 kg, and the winding forms a semi-finished product.

C. Use a rotary infrared curing furnace to heat and cure the semi-finished product. During heating, keep the semi-finished product rotating slowly in the furnace. Under the heating condition of 65°C, the heating and curing time is 60 minutes.

D. Evenly coat the photocuring agent prepared by mixing special low-viscosity epoxy resin, photoinitiator, chain transfer agent and photosensitizer on the outer surface of the semi-finished product after heating and curing, and repeatedly compact the air with a rubber roller, and then use ultraviolet light The ultraviolet light source of the light rotation curing device is irradiated for 20 seconds until hardening to obtain a finished product.

Example 2:

A. Put the glue solution prepared by mixing special bisphenol A, bisphenol F epoxy resin, toughener, modifier, accelerator, and diluent with a viscosity of 0.9 Pa·s in the glue tank. After the glass fiber roving is bundled, it is immersed in the glue solution from one end of the glue tank and slowly moves to the other end of the glue tank to the outside of the tank. The moving speed of the cellulose is controlled to 0.9 m/min, and the glue content is 30%.

B. The fiber bundle after dipping is controlled by a multi-dimensional computer winding machine for longitudinal and circumferential cross-helical winding, the winding angle of the circumferential winding is controlled at 90°, the winding angle of the longitudinal winding is controlled at 45°, and the winding speed is 0.9 m/ Second; in spiral winding and planar winding, the tension of the fiber bundle is controlled at 1.8 kg, and in radial winding, the tension of the fiber bundle is controlled at 3.6 kg, and the winding forms a semi-finished product.

C. Use a rotary infrared curing furnace to heat and cure the semi-finished product. During heating, keep the semi-finished product rotating slowly in the furnace. Under the heating condition of 80°C, the heating and curing time is 80 minutes.

D. Evenly coat the photocuring agent prepared by mixing special low-viscosity epoxy resin, photoinitiator, chain transfer agent and photosensitizer on the outer surface of the semi-finished product after heating and curing, and repeatedly compact the air with a rubber roller, and then use ultraviolet light The ultraviolet light source of the light rotation curing device is irradiated for 30 seconds until hardening to obtain a finished product.

Claims (2)

1. A method for manufacturing a fiber composite insulating cylinder and a pipe fitting, characterized in that the method comprises the following processing steps: A. Fiber dipping, put the glue in the glue tank, heat it to 20-40°C, the viscosity is 0.2-1.0Pa·s, after the fibers are bundled, immerse in the glue from one end of the glue tank and slowly to the other end of the glue tank Move to the outside of the tank, control the moving speed of cellulose to 0.2-0.9 m/min, and the glue content is between 15%-30%; B. Fiber bundle winding tension setting, the initial tension is selected according to 5%-10% of fiber strength, in spiral winding and plane winding, the tension of fiber bundle is controlled at 0.45-1.8 kg, in radial winding, the fiber bundle The tension is controlled at 2.7-3.6 kg; C. Winding of fiber bundles. The fiber bundles after dipping are wound longitudinally and circumferentially in a cross-helical manner using a winding machine. The winding angle of the circumferential winding is between 85°-90°, and the winding angle of the longitudinal winding is 15° or 30°. Or 45°, the maximum winding speed does not exceed 0.9 m/s, and the winding forms a semi-finished product; D. Heating and curing. Use an infrared heating device to heat and cure the semi-finished product. Keep the semi-finished product slowly rotating during heating. Under the heating condition of 30-80°C, the heating and curing time is 30-80 minutes; E. Light curing of the outer surface: Apply the light curing agent evenly on the outer surface of the semi-finished product after heating and curing, repeatedly compact with rubber rollers to discharge the air, and then irradiate with ultraviolet light source for 15-30 seconds until hardening. 2. A method for manufacturing a fiber composite insulation cylinder and pipe fittings according to claim 1, characterized in that said fibers are carbon fibers or glass fibers.