Preparation method for regenerative polyester staple fiber

A technology of regenerated polyester and staple fibers, which is applied in fiber processing, filament generation, melt spinning, etc., can solve the problems of fiber thickening, strength reduction, and high cost, and achieve improved mechanical properties, enhanced reinforcement effects, and thermal shrinkage. The effect of rate reduction

Inactive Publication Date: 2010-12-01
SHANGHAI KNP CHEM +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of imported polyester fibers and the high cost of domestic road-use polyester fibers and their mechanical properties, dry heat shrinkage properties, and dispersion properties in asphalt concrete, the large-scale development of excellent asphalt pavements in my country has been restricted, and in production A large amount of raw polyester materials are consumed in the process, which is not conducive to cost reduction, energy saving and environmental protection
[0004] The existing recycled polyester staple fibers have certain deficiencies in terms of mechanical properties, dry heat shrinkage properties and dispersion properties. The lack of fiber mechanical properties will lead to cracking and settlement of the road surface, which will affect the performance and use of asphalt pavement. Longevity; fiber dry heat shrinkage rate is too high will lead to fiber entanglement easily when concrete is mixed, causing hollow bone effect; fiber heat shrinkage becomes thicker, and strength will also decrease. The higher the fiber shrinkage rate, the more fiber defects are The reinforcement effect becomes worse; so there is an urgent need for a preparation method that can improve the performance of recycled polyester staple fibers to improve the performance of polyester staple fibers and improve the service performance and life of asphalt pavement

Method used

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  • Preparation method for regenerative polyester staple fiber
  • Preparation method for regenerative polyester staple fiber

Examples

Experimental program
Comparison scheme
Effect test

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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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D1/00D01D1/04D01D5/08D01D10/02D01D11/00D02J1/22D02J13/00D01G1/04
Inventor 张杰王依明倪建华郑伟胡敏静何唯平
Owner SHANGHAI KNP CHEM
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