Polyester foamed sheet and semi-continuous preparation method thereof

A foamed sheet, semi-continuous technology, applied in the field of polymer foamed sheet, can solve the problems of reducing the foaming ability of the sheet, limiting technical reliability and practicality, etc., to suppress desorption and escape, and to improve practicability Effect

Active Publication Date: 2021-09-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the glass transition temperature (55 degrees) of PLA in this method is lower than that of PET (75 degrees), and the desorption rate of high-pressure fluid in PLA is higher than that in PET. The continuous desorption reduces the foaming ability of the sheet, which limits the reliability and practicality of the technology

Method used

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  • Polyester foamed sheet and semi-continuous preparation method thereof
  • Polyester foamed sheet and semi-continuous preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The embodiment of the semi-continuous preparation method of polyester foam sheet of the present invention, as figure 1 shown, including the following steps:

[0061] (1) After 100 parts of PET particles (intrinsic viscosity 1dl / g) and 0.5 parts of antioxidant are sequentially dried, pre-mixed, twin-screw continuous extrusion, calendered and rolled, a precursor polyester sheet with a thickness of 0.3mm is obtained ;

[0062] (2) Put the precursor polyester sheet obtained in step (1) into an anhydrous and filled with CO 2 The impregnated polyester sheet with a high-pressure fluid content of 8% and a crystallinity of 5% is obtained by impregnating the fluid in a high-pressure container, and then the impregnated polyester sheet is moved into the cooling chamber and subjected to rapid freezing and air-locking treatment with liquid nitrogen. At this time, the cooling chamber The temperature inside is -60°C, and then stored at -20°C for 1 day at low temperature. After 1 day ...

Embodiment 2

[0066] The embodiment of the semi-continuous preparation method of polyester foam sheet of the present invention comprises the following steps:

[0067] (1) The mixed particles of 100 parts of PET particles (intrinsic viscosity 1dl / g) and PBT particles (intrinsic viscosity 0.9dl / g), 0.5 parts of antioxidant are sequentially dried, pre-mixed, twin-screw continuous extrusion, calendering and After winding, a precursor polyester sheet with a thickness of 0.6 mm is obtained;

[0068] (2) Put the precursor polyester sheet obtained in step (1) into an anhydrous and filled with CO 2 The impregnated polyester sheet with a high-pressure fluid content of 8% and a crystallinity of 5% is obtained by impregnating the fluid in a high-pressure container, and then the impregnated polyester sheet is moved into the cooling chamber and subjected to rapid freezing and air-locking treatment with liquid nitrogen. At this time, the cooling chamber The temperature inside is -60°C, and then stored at...

Embodiment 3

[0072] The embodiment of the semi-continuous preparation method of polyester foam sheet of the present invention comprises the following steps:

[0073] (1) After 100 parts of PET particles (intrinsic viscosity 1.2dl / g) and 0.5 parts of antioxidant are sequentially dried, pre-mixed, twin-screw continuous extrusion, calendered and rolled, a precursor polyester sheet with a thickness of 1mm is obtained ;

[0074] (2) Put the precursor polyester sheet obtained in step (1) into an anhydrous and filled with CO 2 The impregnated polyester sheet with a high-pressure fluid content of 5% and a crystallinity of 12% is obtained by impregnating the fluid in a high-pressure container, and then the impregnated polyester sheet is moved into the cooling chamber and subjected to rapid freezing and air-locking treatment with liquid nitrogen. At this time, the cooling chamber The temperature inside is -60°C, and then stored at -20°C for 1 hour at low temperature. After 1 hour of low temperature...

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Abstract

The invention discloses a polyester foamed sheet and a semi-continuous preparation method thereof, and belongs to the field of polymer foamed sheets. According to the polyester foamed sheet and the semi-continuous preparation method thereof, the dissolution content of a high-pressure fluid in the polyester sheet is controlled, and then the material is subjected to rapid freezing gas locking treatment at a specific temperature, so that desorption escape of the high-pressure fluid is inhibited; the problem that in the prior art, high-quality foaming or remote transportation cannot be achieved due to the high-pressure fluid escape phenomenon of impregnated foaming polyester is solved, the obtained impregnated sheet can be stored for a long time at the low temperature or can be transported remotely, meanwhile, semi-continuous heating foaming can be stably conducted, the weight loss rate is obviously reduced, and the feasibility is obviously improved. The invention also discloses the polyester foamed sheet prepared by the method. The product has a smooth and flat surface, a thickness of 0.2-3.0 mm, a length of not less than 50m, a crystallinity of 20-45%, a density of 0.1-0.6 g / cm < 3 >, and a luminous reflectance of 90% or more.

Description

technical field [0001] The invention relates to the field of polymer foam sheets, in particular to a polyester foam sheet and a semi-continuous preparation method thereof. Background technique [0002] Polymer foam sheet generally refers to a homogeneous polymer foam material with a thickness of 0.5-2.0 mm. It has excellent properties such as light weight, heat insulation, and sound insulation. Components, and then used in food packaging, liquid packaging, automotive interiors, composite materials and other fields. Among them, ethylene terephthalate (PET) is the thermoplastic polyester with the largest output and the cheapest price. It has a significant cost performance and is widely used in the three major fields of synthetic fibers, polyester bottles, and biaxially oriented films. , Other polyester materials include polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT) and polyethylene naphthalate (PEN). Among the materials, the crystalline polyester foa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L67/02C08K3/34
CPCC08J9/122C08J9/0061C08J9/0066C08J2203/06C08J2201/032C08J2367/02C08J2467/02C08K3/34
Inventor 翟文涛
Owner SUN YAT SEN UNIV
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