Preparation method for regenerative polyester staple fiber

Abstract

The invention provides a preparation method for regenerative polyester staple fiber, comprising the following steps: drying polyester regenerated material, mixing the polyester regenerated material with inorganic granule, melting by a screw melt extrusion spinning machine, spinning, cooling, bundling and applying oil, falling bucket in reciprocating manner and bundling; carrying out first-stage oil bath traction by a traction machine, carrying out second-stage steam traction by the traction machine, carrying out tension heat shaping by the traction machine, cooling and applying oil, carrying out three-stage tension by the traction machine, and cutting by a staple fiber cutting machine; the method has low production cost, high efficiency, energy-saving and environment-friendly performances; the fiber prepared by the invention has high density, large oil absorbing quantity and has good dispersity, and is not easy to intertwist, thereby improving mechanical property, remarkably reducing thermal shrinkage and aging resistance; and, the bond stress with the aggregate is enhanced in the asphalt concrete, thereby remarkably improving the reinforcing effect of asphalt concrete.

Description

technical field

[0001] The invention relates to a preparation method of short fibers, in particular to a preparation method of recycled polyester short fibers applied to asphalt concrete. Background technique

[0002] Most of the domestic high-grade highways and urban roads are asphalt pavement. With the rapid development of the national economy, the vehicles on the road are changing to the direction of high density, fast speed and heavy axle load. Require. For the existing asphalt pavement structure, the change of traffic volume and composition has caused the decline of pavement structure service capacity and the premature occurrence of structural damage, which also promotes the improvement and renewal of asphalt pavement technology. Various types of fiber materials are being promoted in domestic asphalt pavement technology.

[0003] In the 1970s, Kapejo Company of the United States developed Boni Fibers road engineering fibers. After nearly 30 years of application, resea...

Examples

Embodiment 1

[0024] In this embodiment, the intrinsic viscosity of recycled polyester bottle flakes is 0.8, and about 5% of recycled polyester foam (viscosity 0.7) is added. The colors of the raw materials are all bright white. The drying temperature is 135° C., and the drying time is 2 hours. After drying, the water content of the slices is reduced to below 40ppm. The system adopts filling and stirring drying, with low drying temperature, short drying time and obvious drying effect.

[0025] Before the polyester raw material is added to the screw spinning machine, add titanium dioxide in an amount of 15%, mix it evenly with a high-speed mixer, and then add it to the screw spinning machine. The spinning speed is 700m / min to make a pre-drawn yarn and reciprocate drop barrel.

[0026] exist figure 1 In the first stage of drafting, a special fiber finishing oil and preservative are added to the oil tank, the concentration of the oil is 1.0%, the temperature of the oil tank is 68±2℃, and the ...

Embodiment 2

[0032] In this example, the intrinsic viscosity of recycled polyester bottle flakes is 0.75, the color of the raw materials is bright white, the drying temperature is 125°C, and the drying time is 2.5 hours. After drying, the water content of the slices is reduced to below 40ppm. The temperature is low, the time is short and the drying effect is obvious.

[0033] Before the polyester raw material is added to the screw spinning machine, add titanium dioxide in an amount of 15%, mix it evenly with a high-speed mixer, and then add it to the screw spinning machine. The spinning speed is 700m / min to make a pre-drawn yarn and reciprocate drop barrel.

[0034] exist figure 1 In the first stage of drafting, add a special fiber finishing oil and preservative to the oil tank, the concentration of the oil is 1.0%, the temperature of the oil tank is 70 ℃, and the draft ratio is 3.5 times; The temperature is 140°C, the draw ratio is 1.15 times; the draw ratio is 86%.

[0035] In the ten...

Embodiment 3

[0040] In this embodiment, the intrinsic viscosity of recycled polyester bottle flakes is 0.80, and about 20% of recycled polyester foam (viscosity 0.7) is added. The colors of the raw materials are all bright white. The drying temperature is 135° C., and the drying time is 2 hours. After drying, the water content of the slices is reduced to below 40ppm. The system adopts filling and stirring drying, with low drying temperature, short drying time and obvious drying effect.

[0041] The polyester raw material is added to the screw spinning machine for spinning, and the spinning speed is 700m / min to make a pre-drawn yarn and reciprocally fall into the barrel.

[0042] exist figure 1In the first stage of drafting, add a special fiber finishing oil and preservative to the oil tank, the concentration of the oil is 1.5%, the temperature of the oil tank is 70 ℃, and the draft ratio is 3.5 times; The temperature is 120°C, the draw ratio is 1.15 times; the draw ratio is 86%.

[0043]...

technical field

[0001] The invention relates to a preparation method of short fibers, in particular to a preparation method of recycled polyester short fibers applied to asphalt concrete. Background technique

[0002] Most of the domestic high-grade highways and urban roads are asphalt pavement. With the rapid development of the national economy, the vehicles on the road are changing to the direction of high density, fast speed and heavy axle load. Require. For the existing asphalt pavement structure, the change of traffic volume and composition has caused the decline of pavement structure service capacity and the premature occurrence of structural damage, which also promotes the improvement and renewal of asphalt pavement technology. Various types of fiber materials are being promoted in domestic asphalt pavement technology.

[0003] In the 1970s, Kapejo Company of the United States developed Boni Fibers road engineering fibers. After nearly 30 years of application, resea...

Examples

Embodiment 1

[0024] In this embodiment, the intrinsic viscosity of recycled polyester bottle flakes is 0.8, and about 5% of recycled polyester foam (viscosity 0.7) is added. The colors of the raw materials are all bright white. The drying temperature is 135° C., and the drying time is 2 hours. After drying, the water content of the slices is reduced to below 40ppm. The system adopts filling and stirring drying, with low drying temperature, short drying time and obvious drying effect.

[0025] Before the polyester raw material is added to the screw spinning machine, add titanium dioxide in an amount of 15%, mix it evenly with a high-speed mixer, and then add it to the screw spinning machine. The spinning speed is 700m / min to make a pre-drawn yarn and reciprocate drop barrel.

[0026] exist figure 1 In the first stage of drafting, a special fiber finishing oil and preservative are added to the oil tank, the concentration of the oil is 1.0%, the temperature of the oil tank is 68±2℃, and the ...

Embodiment 2

[0032] In this example, the intrinsic viscosity of recycled polyester bottle flakes is 0.75, the color of the raw materials is bright white, the drying temperature is 125°C, and the drying time is 2.5 hours. After drying, the water content of the slices is reduced to below 40ppm. The temperature is low, the time is short and the drying effect is obvious.

[0033] Before the polyester raw material is added to the screw spinning machine, add titanium dioxide in an amount of 15%, mix it evenly with a high-speed mixer, and then add it to the screw spinning machine. The spinning speed is 700m / min to make a pre-drawn yarn and reciprocate drop barrel.

[0034] exist figure 1 In the first stage of drafting, add a special fiber finishing oil and preservative to the oil tank, the concentration of the oil is 1.0%, the temperature of the oil tank is 70 ℃, and the draft ratio is 3.5 times; The temperature is 140°C, the draw ratio is 1.15 times; the draw ratio is 86%.

[0035] In the ten...

Embodiment 3

[0040] In this embodiment, the intrinsic viscosity of recycled polyester bottle flakes is 0.80, and about 20% of recycled polyester foam (viscosity 0.7) is added. The colors of the raw materials are all bright white. The drying temperature is 135° C., and the drying time is 2 hours. After drying, the water content of the slices is reduced to below 40ppm. The system adopts filling and stirring drying, with low drying temperature, short drying time and obvious drying effect.

[0041] The polyester raw material is added to the screw spinning machine for spinning, and the spinning speed is 700m / min to make a pre-drawn yarn and reciprocally fall into the barrel.

[0042] exist figure 1In the first stage of drafting, add a special fiber finishing oil and preservative to the oil tank, the concentration of the oil is 1.5%, the temperature of the oil tank is 70 ℃, and the draft ratio is 3.5 times; The temperature is 120°C, the draw ratio is 1.15 times; the draw ratio is 86%.

[0043]...

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