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A kind of polyester foam sheet and its semi-continuous preparation method

A foam sheet, semi-continuous technology, applied in the field of polymer foam sheet, can solve the problems of limiting technical reliability and practicability, reducing sheet foaming ability, etc., to achieve the suppression of desorption and escape, and the improvement of implementability Effect

Active Publication Date: 2022-04-22
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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  • A kind of polyester foam sheet and its semi-continuous preparation method
  • A kind of polyester foam sheet and its semi-continuous preparation method

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 foam sheet and a semi-continuous preparation method thereof, belonging to the field of polymer foam sheets. The polyester foam sheet and its semi-continuous preparation method of the present invention control the dissolved content of the high-pressure fluid in the polyester sheet, and then perform rapid freezing and air-locking treatment on the material at a specific temperature to suppress the desorption and escape of the high-pressure fluid, and solve the problem The impregnated foamed polyester in the prior art can not realize high-quality foaming or long-distance transportation due to high-pressure fluid escape. Continuous heating and foaming, the weight loss rate is significantly reduced, and the implementability is significantly improved. The invention also discloses the polyester foam sheet prepared by the method. The product has a smooth surface, a thickness of 0.2-3.0mm, a length of not less than 50m, a crystallinity of 20-45%, and a density of 0.1-0.6g. / cm 3 , with a light reflectivity of more than 90%.

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 Patents(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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