Preparation method of flat acrylic fiber

Abstract

The invention relates to a preparation method of flat acrylic fiber. The preparation method is characterized by sequentially including following steps: spinning, coagulating, and forming: extruding polymer dope of 10-13.5wt% in polyacrylonitrile copolymer content into coagulating bath by a rectangular-hole spinneret plate after being treated specially, and forming primary fiber through double diffusion coagulating; drying for densification after water washing and drafting, and performing heat setting; oiling, winding, and drying: subjecting fiber after being treated thermally to soak-oiling and winding sequentially to endow with processability after spinning to obtain the flat acrylic fiber. Compared with existing rectangular-hole spinneret plates, the preparation method has the advantagesthat the surface of a tantalum metal spinneret plate is improved through nitriding and siliconing, in this way, temperature difference of the polymer dope in the spinneret plate and the coagulating bath is increased from delta 45-50 DEG C before treatment to delta 55-60 DEG C, contact angle of the dope at an orifice outlet is increased by 30 degrees, rheological performance of the dope is improved, and production stability and quality improvement of the flat fiber are ensured.

Description

technical field

[0001] The invention relates to a method for preparing acrylic fiber, in particular to a method for preparing flat acrylic fiber spun from a specially treated spinneret with rectangular holes. Background technique

[0002] Acrylic fiber is a kind of textile fiber raw material with a large quantity and a wide range. Flat acrylic fiber is one of the functional fibers widely used in the fields of post-spinning fur, plush products and blankets. The unique performance of acrylic fiber and the flat fiber cross section make it The fabric has a unique style that cannot be replaced by other synthetic fibers in terms of luster, elasticity, anti-pilling, bulkiness, hand feeling and simulation effect.

[0003] There are many production routes for flat acrylic fiber, among them, the wet process route using NaSCN as solvent is an industrial production route with high production capacity and wide application range of acrylic fiber. The acrylic fiber produced by NaSCN method...

Examples

Embodiment

[0034] A kind of preparation method of flat acrylic fiber, comprises the steps successively:

[0035] Spinning coagulation forming: Extrude the polymer stock solution with a polyacrylonitrile copolymer content of 10-13.5wt% from a specially treated spinneret with rectangular holes into the coagulation bath, and form the primary fiber through double-diffusion coagulation forming. The temperature for spinning is 65-75°C, the temperature of the coagulation bath is -3-0°C, and the concentration of the coagulation bath is 14.0-15.5wt%.

[0036] Washing and drafting: After the as-spun fibers are washed to remove the spinning solvent, the drafting is completed. Among them, the washing temperature is 45-65°C, and the draft ratio is 3.0-5.0 times.

[0037] Drying and densification: after drawing, the fiber is passed through a dryer to complete the densification process, and the densification wet bulb temperature is controlled at 55-80 °C.

[0038] Heat setting: The densified fiber en...

technical field

[0001] The invention relates to a method for preparing acrylic fiber, in particular to a method for preparing flat acrylic fiber spun from a specially treated spinneret with rectangular holes. Background technique

[0002] Acrylic fiber is a kind of textile fiber raw material with a large quantity and a wide range. Flat acrylic fiber is one of the functional fibers widely used in the fields of post-spinning fur, plush products and blankets. The unique performance of acrylic fiber and the flat fiber cross section make it The fabric has a unique style that cannot be replaced by other synthetic fibers in terms of luster, elasticity, anti-pilling, bulkiness, hand feeling and simulation effect.

[0003] There are many production routes for flat acrylic fiber, among them, the wet process route using NaSCN as solvent is an industrial production route with high production capacity and wide application range of acrylic fiber. The acrylic fiber produced by NaSCN method...

Examples

Embodiment

[0034] A kind of preparation method of flat acrylic fiber, comprises the steps successively:

[0035] Spinning coagulation forming: Extrude the polymer stock solution with a polyacrylonitrile copolymer content of 10-13.5wt% from a specially treated spinneret with rectangular holes into the coagulation bath, and form the primary fiber through double-diffusion coagulation forming. The temperature for spinning is 65-75°C, the temperature of the coagulation bath is -3-0°C, and the concentration of the coagulation bath is 14.0-15.5wt%.

[0036] Washing and drafting: After the as-spun fibers are washed to remove the spinning solvent, the drafting is completed. Among them, the washing temperature is 45-65°C, and the draft ratio is 3.0-5.0 times.

[0037] Drying and densification: after drawing, the fiber is passed through a dryer to complete the densification process, and the densification wet bulb temperature is controlled at 55-80 °C.

[0038] Heat setting: The densified fiber en...