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Method for preparing high-strength synthetic fibers by using two-stage high-temperature sectional drafting

A synthetic fiber and high-strength technology, which is applied in the field of polymer material preparation, can solve the problems of limited and unreachable reinforcement multiples, and achieve the effect of improving performance and fiber strength

Active Publication Date: 2017-04-26
殷石
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current technology and disclosed patents, the multiples that can be enhanced are limited, and very ideal effects cannot be achieved.

Method used

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  • Method for preparing high-strength synthetic fibers by using two-stage high-temperature sectional drafting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment is applied to the preparation of high-strength polypropylene fibers, and the preparation process includes the following steps:

[0029] After fully mixing polypropylene resin, maleic anhydride grafted polypropylene, color masterbatch, high temperature resistant masterbatch, anti-corrosion masterbatch and defoaming masterbatch, they are added to a single-screw extruder for melt extrusion. Immediately after the fiber is extruded, it is cooled in cooling water to obtain an undrawn filament in an amorphous state. The fiber is drawn in two stages at high temperature. The first stage is drawn at high temperature in stages. The total length of the heating oven is 6m, the length of the front heating plate is 2m, and the temperature is 50°C. There is a roller at both ends of an oven, the rotating speed of the first roller is 3 meters per minute, the rotating speed of the second roller is 15 meters per minute, and the draft ratio is 5 times; High temperature draf...

Embodiment 2

[0031] This embodiment is applied to the preparation of high-strength polyester amide fibers, and the preparation process includes the following steps:

[0032] After nylon 6 and polybutylene adipate are copolymerized, they are added to a single-screw extruder for melt extrusion. Immediately after the fiber is extruded, it is cooled in cooling water to obtain an undrawn filament in an amorphous state. The fiber is drawn in two stages at high temperature. The first segmental high-temperature drafting, the total length of the heating oven is 6m, the length of the front heating plate is 3m, the temperature is 20°C, the length of the rear heating plate is 3m, the temperature is 30°C, and the draft ratio is 2 times; High-temperature drafting, the total length of the heating oven is 6m, the length of the heating plate in the front section is 3m, the temperature is 70°C, the length of the heating plate in the rear section is 3m, the temperature is 80°C, and the draft ratio is 5 time...

Embodiment 3

[0034] This embodiment is applied to the preparation of high-strength polyvinyl alcohol fibers, and the preparation process includes the following steps:

[0035] After the polyvinyl alcohol is swollen, it is added to a single-screw extruder for melt extrusion. After the fibers are extruded, they are subjected to freezing, alcoholysis and neutralization. The fiber is drawn in two stages at high temperature. The first segmental high-temperature drawing, the total length of the heating oven is 6m, the length of the front heating plate is 4m, the temperature is 90°C, the length of the rear heating plate is 2m, the temperature is 100°C, and the draft ratio is 3 times; High-temperature drafting, the total length of the heating oven is 6m, the length of the heating plate in the front section is 4m, the temperature is 140°C, the length of the heating plate in the rear section is 2m, the temperature is 150°C, and the draft ratio is 6 times. The rate control mode is the same as that ...

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Abstract

The invention relates to a method for preparing high-strength synthetic fibers by using two-stage high-temperature sectional drafting. The method includes the steps of synthetic resin melt spinning or melt extrusion, cooling, sectional high-temperature drafting, heat setting and fiber surface treatment; according to the sectional high-temperature drafting, the temperature of the front sections and rear sections of drying ovens is independently adjusted and controlled, and the temperature of the rear sections is higher than the temperature of the front sections; and the sectional high-temperature drafting includes two-stage sectional high-temperature drafting, namely, the process of the sectional high-temperature drafting includes first-stage drafting and second-stage drafting which are performed in two drying ovens sequentially, the heating temperature of the front section of the drying oven where the second-stage drafting is performed is not lower than the heating temperature of the rear section of the drying oven where the first-stage drafting is performed, and the rate of the second-stage drafting is not lower than that of the first-stage drafting. According to the method of the invention, corresponding temperature adjustment is performed at different positions of the drying ovens according to the orientational crystallization conditions of fiber molecular chains, and therefore, the strength of the fibers can be greatly improved. The method of the invention can be widely applied to the preparation of a variety of kinds of fibers and can greatly improve the use performance of the fibers.

Description

technical field [0001] The invention relates to a method for preparing synthetic fibers, which belongs to the field of polymer material preparation. Background technique [0002] Synthetic fibers have the advantages of high strength, low cost, good chemical stability, acid and alkali resistance, microbial resistance, wear resistance, etc., and are widely used in building materials, safety protection, aerospace, medical, sports, electronics, military and many other fields. Its basic preparation process is melt spinning or melt extrusion of synthetic resin, cooling, high temperature drawing, heat setting, fiber surface treatment and winding. [0003] CN1401021A discloses a manufacturing method of high-strength polyester amide fiber. Its production process is to melt-spin the polyester amide copolymer, then cool it at a temperature below 20°C to obtain non-crystalline unstretched filaments, and then pass through one or more ovens at 70-110°C High-temperature stretching, the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/12D01D10/02
CPCD01D5/12D01D10/02
Inventor 殷石石峰
Owner 殷石
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