Biodegradable regenerated polyester and preparation method thereof

A recycled polyester and biological technology, applied in the fields of biodegradable recycled polyester and its preparation, high-quality biodegradable recycled polyester and its high-efficiency preparation, can solve the problem of high TVOC content in biodegradable recycled polyester, and achieve It is convenient for precise control, saves production cost and ensures the effect of uniformity

Active Publication Date: 2017-12-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a high-quality biodegradable recycled polyester and its high-efficiency preparation method, which can effectively improve the biodegradable recycled polyester produced from recycled polyester materials while taking into account th

Method used

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  • Biodegradable regenerated polyester and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0062] A preparation method of biodegradable regenerated polyester, such as figure 1 shown, the steps are as follows:

[0063] 1) Under the protection of nitrogen, the polyester recycle material with a moisture content of 95 ppm, a catalyst and a polyester oligomer melt with an average degree of polymerization of 1.5 were added to the twin-screw extruder 13 for reactive melt blending to obtain an average polymerization. The initial depolymerization melt with a degree of 20, wherein the mass ratio of polyester recycled material and polyester oligomer melt is 0.1:1, the catalyst is tetra-n-butyl titanate, and the mass of metal elements in the catalyst is relative to the mass of the polymer. According to the mass calculation of the ester oligomer melt, the content of the catalyst is 10 ppm; the reaction conditions are: the temperature of the twin-screw feeding section is 260 °C, the temperature of the twin-screw compression section is 275 °C, the temperature of the homogenization...

Embodiment 2

[0076] A preparation method of biodegradable regenerated polyester, the steps are as follows:

[0077] 1) Under the protection of nitrogen, the polyester recycled material with a moisture content of 92 ppm, a catalyst and a polyester oligomer melt with an average degree of polymerization of 2.8 were added to a twin-screw extruder for reactive melt blending to obtain an average degree of polymerization. It is the preliminary depolymerization melt of 31, wherein the mass ratio of polyester recycled material and polyester oligomer melt is 1.3:1, the catalyst is tetraisopropyl titanate, and the mass of metal elements in the catalyst is relative to the polyester The mass of the oligomer melt was calculated, and the content of the catalyst was 30 ppm; the reaction conditions were: the temperature of the twin-screw feeding section was 261 °C, the temperature of the twin-screw compression section was 277 °C, and the temperature of the homogenization section was 276 °C, and the time was...

Embodiment 3

[0087] A preparation method of biodegradable regenerated polyester, the steps are as follows:

[0088] 1) Under the protection of nitrogen, polyester recycled material with a moisture content of 91.5 ppm, a catalyst and a polyester oligomer melt with an average degree of polymerization of 2.0 were added to a twin-screw extruder for reactive melt blending to obtain an average The preliminary depolymerization melt with a degree of polymerization of 32, wherein the mass ratio of the polyester recycled material to the polyester oligomer melt is 1.5:1, the catalyst is ethylene glycol titanium, and the mass of the metal elements in the catalyst is relative to the polyester The mass of the oligomer melt was calculated, and the content of the catalyst was 50 ppm; the reaction conditions were: the temperature of the twin-screw feeding section was 262 °C, the temperature of the twin-screw compression section was 278 °C, and the temperature of the homogenization section was 278 °C, and th...

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Abstract

The invention relates to biodegradable regenerated polyester and a preparation method thereof. First polyester reclaimed materials and polyester low polymer melt react to obtain preliminary depolymerization melt, and then the preliminary depolymerization melt and ethylene glycol react to obtain deep depolymerization melt, the deep depolymerization melt and ethylene glycol steam perform convection flow to obtain low TVOC content polyester oligomer melt, aliphatic divalent polyether esterification product is prepared, the polyester oligomer melt and the aliphatic divalent polyether esterification product undergo pre-condensation reaction to obtain low TVOC content precondensible polyester melt, the precondensible polyester melt undergoes final polycondensation reaction to obtain low TVOC content regenerative polyester melt, and finally the low TVOC content regenerative polyester melt enters a melt cooling pelleting system to obtain the biodegradable regenerated polyester. The method is moderate in overall process flow length and process control difficulty and has high efficiency, and the content of TVOC and nonylphenol and an isomeride thereof in the finally made biodegradable regenerated polyester is low.

Description

technical field [0001] The invention belongs to the field of regeneration of waste polyester, relates to a biodegradable recycled polyester and a preparation method thereof, in particular to a high-quality biodegradable recycled polyester with a low TVOC content prepared from recycled polyester materials and an efficient preparation method thereof. Background technique [0002] Polyethylene Terephthalate (PET, polyester for short) is a widely used synthetic polymer material. In 2015, the global PET output exceeded 40 million tons, second only to polyolefin, and is the most important synthetic fiber. And the leading material used in the field of food packaging (accounting for more than 80%). However, as a non-degradable petroleum-based synthetic polymer material, the social reserves of polyester waste products are also very large, especially waste polyester textiles with complex types of impurities and high content are increasing at a rate of one million tons every year, but...

Claims

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Application Information

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IPC IPC(8): C08G63/672C08G63/78C08L67/02C08J11/24
CPCC08G63/672C08G63/78C08J11/24C08J2367/02C08L67/02Y02P20/584Y02W30/62
Inventor 王少博王朝生陈烨王华平胡继月李建武
Owner DONGHUA UNIV
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