Foaming PET (Polyethylene Terephthalate) sheet and preparation method thereof
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A sheet material and foaming agent technology, applied in the field of polymer foaming material preparation, can solve problems such as unfavorable bubble nucleation and stability, inability to realize continuous production, affect product performance and use safety, etc., and achieve cell size distribution And the effect of excellent mechanical properties, highly continuous and stable production process, and excellent comprehensive evaluation
Inactive Publication Date: 2013-06-26
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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Problems solved by technology
[0005] When PET is used as a foam material matrix, due to its own characteristics, the expandability is very low
Compared with the commonly used PS and LDPE resins, semi-crystalline, relatively high-density PET foams face several problems: (1) PET processing temperature is relatively high (260-290 ° C); (2) and amorphous Compared with resin, the processing temperature range is narrower; (3) The rheological properties of foaming materials are poor, which is not conducive to foaming; (4) The crystallization speed of PET is slow, which is not conducive to the nucleation and stability of bubbles; (5) Other Crystal nucleation may conflict with bubble nucleation
However, this method mainly uses a chemical blowing agent, and a part of the chemical blowing agent will remain in the product during the foam preparation process, which will affect product performance and use safety.
[0007] Chinese patent CN101885855A discloses a method for preparing PET foam sheets, which uses liquid carbon dioxide as a foaming agent to prepare PET foam sheets by kettle pressure, but this method cannot achieve continuous production
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Embodiment 1
[0035] Example 1 Preparation of foamed PET sheet.
[0036] Dry the PET resin and bubble nucleating agent at 100°C for 10h.
[0037] Use 100 parts by weight of PET (intrinsic viscosity is 0.87), add one part by weight of modified montmorillonite bubble nucleating agent, and inject 0.6 kg / h of liquid carbon dioxide. In the second-stage single-screw extruder, the extrusion temperature As follows: extruder delivery section 200, 210, 215°C; compression section 215, 220, 225, 225, 215, 215, 210, 210°C; homogenization section 205, 205, 205, 205°C. The head temperature is 200°C.
[0038] The properties of the obtained PET foam sheet are shown in Table 1.
[0039] Table 1
[0040] Density (g / cc) 0.74 Tensile strength (MPa) 13.20 Impact strength (KJ / cm 3 ) 11.36 Expanding ratio 2.14
Embodiment 2
[0041] Example 2 Preparation of foamed PET sheet.
[0042] Dry the PET resin and bubble nucleating agent at 100°C for 10h.
[0043] Using 100 parts by weight of PET (intrinsic viscosity is 1.15), adding one part by weight of modified montmorillonite bubble nucleating agent, the amount of liquid carbon dioxide injected is 0.6kg / h, in the second-stage single-screw extruder, the extrusion temperature As follows: extruder delivery section 200, 210, 215°C; compression section 215, 220, 225, 225, 215, 215, 210, 210°C; homogenization section 205, 205, 205, 205°C. The head temperature is 200°C.
[0044] The properties of the obtained PET foam sheet are shown in Table 2.
[0045] Table 2
[0046] Density (g / cc) 0.53 Tensile strength (MPa) 16.40 Impact strength (KJ / cm 3 ) 14.27 Expanding ratio 3.42
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Abstract
The invention relates to a foaming PET (Polyethylene Terephthalate) sheet and a preparation method of the foaming PET sheet; the sheet is composed of the following components according to part by weight: 100 parts of PET resin, 0.1-10 parts of nucleating agent, 0.1-10 parts of foaming stabilizer and 1.5-18 parts of composite foaming agent; after being mixed by an extruding machine, the componentsare extruded, foamed and molded, so PET foam sheet is obtained, wherein the composite foaming agent comprises 1-10 parts of liquid carbon dioxide, 0.5-5 parts of second component foaming agent and 0-3 parts of third component foaming agent according to part by weight. In comparison with the prior art, the advantages are as follows: PET foaming packaging sheets with medium-low foaming ratio and good mechanical property can be prepared; the production process is highly continuous, steady and safe without environment pollution, so the production process is suitable for industrial production. Thefoaming ratio, cell size distribution and mechanical property of products have good comprehensive evaluation; and the main foaming agent is carbon dioxide so as not to affect the usability and safetyof products.
Description
technical field [0001] The invention relates to a PET foam sheet prepared by continuous extrusion of a composite foaming agent and a preparation method thereof, belonging to the technical field of polymer foam preparation. Background technique [0002] Polymer foam sheet has been widely used in various industries and daily life due to its light weight, heat insulation, sound insulation, energy absorption, cushioning and other advantages. According to the expansion ratio of the polymer foam material, that is, the ratio of the density of the polymer matrix resin to the density of the foam material, the polymer foam material can be divided into ultra-high ratio (more than 40 times), high ratio (40-4 times) and low magnification (below 4x). Among them, the low-magnification polymer foam sheet has good rigidity and heat resistance in addition to the usual characteristics of foam sheets. It is very suitable for applications such as cups, bowls and other container packaging that ...
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