阅读说明：本技术 一种再生pet托幕线及其生产方法 (Regenerated PET curtain supporting line and production method thereof ) 是由 马海燕 司淼 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种再生PET托幕线及其生产方法,再生PET托幕线的特性粘度为1.02~1.12 dl/g,强度≥5.5 CN/dtex,直径为1.8~6.0mm,圆整度≥90%,断裂伸长率10~15%,干热收缩率10~15%。本发明方法简便,可有效提高再生PET的特性粘度,并大大提高了由此制得的托幕线单丝的强度。(The invention discloses a regenerated PET curtain supporting wire and a production method thereof, wherein the intrinsic viscosity of the regenerated PET curtain supporting wire is 1.02-1.12 dl/g, the strength is more than or equal to 5.5CN/dtex, the diameter is 1.8-6.0 mm, the roundness is more than or equal to 90%, the elongation at break is 10-15%, and the dry heat shrinkage rate is 10-15%. The method is simple and convenient, can effectively improve the intrinsic viscosity of the regenerated PET, and greatly improves the strength of the monofilament of the curtain supporting line prepared by the method.)

1. The utility model provides a regeneration PET holds in palm curtain line which characterized by: the intrinsic viscosity is 1.02-1.12 dl/g, the strength is more than or equal to 5.5CN/dtex, the diameter is 1.8-6.0 mm, the roundness is more than or equal to 90%, the elongation at break is 10-15%, and the dry heat shrinkage is 10-15%.

2. A production method of a regenerated PET curtain supporting line is characterized by comprising the following steps: comprises the following steps:

(1) putting the regenerated PET slices with the moisture of about 30ppm after vacuum drying into a solid-phase tackifying device, and rotating for 20 hours at the temperature of 220 ℃ under the vacuum environment of 50 Pa to obtain solid-phase tackified regenerated PET slices;

(2) melting and extruding the solid-phase tackified regenerated PET slices through a single-screw extruder, adding an auxiliary agent in the melting and extruding process to react for 60-120 seconds; the diameter of the screw is 30-85 mm, the temperature of each zone of the screw is 270 ℃, 280 ℃ and 290 ℃, the liquid cooling temperature is 70 ℃, the total stretching ratio is 5.8-6.8 times, the stretching temperature is 240 ℃, and the heat setting temperature is 260 ℃, so that the regenerated PET support curtain wire with the wire diameter of 1.8-6.0 mm is prepared;

the auxiliary agent is prepared by compounding the following components in parts by mass:

71% -99% of polydimethylsiloxane and 29% -1% of isocyanate; the dosage of the auxiliary agent is 0.1-0.5% of the dosage of the regenerated PET raw material.

Technical Field

The invention relates to a regenerated PET curtain supporting line and a production method thereof.

Background

The prior recycled material of polyethylene terephthalate is difficult to be made into high-strength monofilaments because of low intrinsic viscosity which is generally about 0.55dl/g, and cannot be applied to high-strength monofilament products such as curtain supporting lines and the like.

Disclosure of Invention

The invention aims to provide a regenerated PET (polyethylene terephthalate) curtain supporting line capable of effectively improving the intrinsic viscosity of recycled polyethylene terephthalate and a production method thereof.

The technical solution of the invention is as follows:

the utility model provides a regeneration PET holds in palm curtain line which characterized by: the intrinsic viscosity is 1.02-1.12 dl/g, the strength is more than or equal to 5.5CN/dtex, the diameter is 1.8-6.0 mm, the roundness is more than or equal to 90%, the elongation at break is 10-15%, and the dry heat shrinkage rate is 10-15% (the test temperature is 180 ℃ and the test time is 30 minutes).

The production method comprises the following steps:

(1) and putting the regenerated PET slices with the moisture of about 30ppm after vacuum drying into a solid-phase tackifying device, and rotating for 20 hours at the temperature of 220 ℃ under the vacuum environment of 50 Pa to obtain the solid-phase tackified regenerated PET slices with the intrinsic viscosity of 0.90 dL/g.

(2) Melting and extruding the solid-phase tackified regenerated PET slices through a single-screw extruder, adding an auxiliary agent in the melting and extruding process to react for 60-120 seconds; the diameter of the screw is 30-85 mm, the temperature of each zone of the screw is 270 ℃, 280 ℃ and 290 ℃, the liquid cooling temperature is 70 ℃, the total stretching ratio is 5.8-6.8 times, the stretching temperature is 240 ℃, and the heat setting temperature is 260 ℃, so that the regenerated PET support curtain wire with the wire diameter of 1.8-6.0 mm is prepared.

The auxiliary agent is prepared by compounding the following components in parts by mass:

71-99% of polydimethylsiloxane and 29-1% of isocyanate. The dosage of the auxiliary agent is 0.1-0.5% of the dosage of the regenerated PET raw material.

The method is simple and convenient, can effectively improve the intrinsic viscosity of the regenerated PET, and greatly improves the strength of the monofilament of the curtain supporting line prepared by the method.

The present invention will be further described with reference to the following examples.

The specific implementation mode is as follows: