PETG blow molding film and preparation method thereof

A technology of blown film and anti-blocking agent, which is applied in the field of blown film and its preparation. It can solve the problems of difficult continuous and stable blown film production, huge difference in melt performance, and abnormal molding, etc., and achieves flexible and convenient product replacement and high processing temperature. The effect of wider range and lower production cost

Active Publication Date: 2010-09-22
YIXING GUANGHUI PACKAGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The polyester film preparation methods disclosed above are basically bidirectional or unidirectional casting and stretching flat film forming, and the shortcomings of the stretching method still exist.
[0011] The modified copolyester heat-shrinkable film disclosed in Chinese patent CN101134810 can be prepared by blown film, but it is a new copolyester modified by adding new monomers during the polymerization process, not 1,4 - Cyclohexanedimethanol modified PETG polyester, which is slightly less tough than PETG
However, the melt properties of PETG ...

Method used

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  • PETG blow molding film and preparation method thereof
  • PETG blow molding film and preparation method thereof
  • PETG blow molding film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: see figure 1 , One-time inflation molding (one-bubble method) to prepare non-shrinkable PETG blown film.

[0037] Material composition: PETG (intrinsic viscosity 0.68) 91.545wt%, silicon dioxide 2.5wt%, ricinoleic acid amide 0.7wt%, stearamidopropyl dimethyl-β-hydroxyethylammonium dihydrogen phosphate 0.25 wt%, bisoxazoline 0.005wt%, modified ethylene propylene rubber 5wt%.

[0038] Blown film preparation: fully mix the materials in a low-speed mixer → send them to a vacuum dryer 1 for drying → transport them to a single-screw extruder 2 for plasticizing and extruding → blow the film once through a film blowing head 3 → curl → divide Cut → finished product.

[0039] Process parameters: Mixing: heating temperature is less than 40°C, speed 650 rpm, mixing for 8-15 minutes; vacuum drying: 65±5°C for 8h, vacuum degree 0.01-0.02Mpa, stop drying when the moisture content is ≤0.008wt%; single The temperature of each section of the screw plasticizing extruder f...

Embodiment 2

[0040] Example 2: see figure 1 , One-time inflation molding to prepare non-shrinkable PETG blown film.

[0041] Material composition: PETG (intrinsic viscosity 0.70) 87.292wt%, artificial talc 3.0wt%, oleic acid amide 1.0wt%, alkyl phosphate diethanolamine salt 0.7wt%, homopolytetracarboxylic dianhydride 0.008wt%, styrene - Ethylene-butadiene-styrene copolymer 8 wt%.

[0042] The extrusion process is as in Example 1. Process parameters before extrusion are as in Example 1. Temperature of each section of plasticizing single-screw extruder: 160±5°C, 180±5°C, 190±5°C, 200±5°C, 215±5°C; connector temperature: 210±5°C; film blowing head temperature : 218±3℃; inflation ratio: 3.2.

Embodiment 3

[0043] Embodiment 3: see figure 2 or image 3 , Two-way heat-shrinkable PETG blown film prepared by secondary inflation molding (two-bubble method).

[0044] Material composition: PETG (intrinsic viscosity number 0.72) 90.85wt%, hydrated magnesium silicate 2.9wt%, erucamide 0.8wt%, stearamidopropyl dimethyl-β-hydroxyethyl ammonium nitrate 0.314wt%, Epoxy styrene-acrylic acid random copolymer 0.006wt%, ethylene-vinyl acetate copolymer 5.13wt%.

[0045] Blown film preparation: one-time blown film is the same as Example 1, wherein the temperature of each section of the single-screw extruder: 170±5°C, 185±5°C, 195±5°C, 208±5°C, 217±5°C; connector temperature : 210±5℃; blown film head temperature: 212±3℃; inflation ratio: 1.7. After the primary blown film, the primary blown film is heated by far infrared for 11 (oven temperature: 100±5°C) ( figure 2 ), or water bath heating 17 (water tank temperature: 95 ± 5 ℃ image 3 ) image 3 , for the second cooking film, the second in...

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Abstract

The invention relates to improvement of a PETG (polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester) thin film and a preparation method. The PETG thin film is prepared by mixing 85-92 wt. % of PETG, 2.0-4.0 wt. % of opening agent, 0.5-1.5 wt. % of slipping agent, 0.2-1.0 wt. % of antistatic agent, 0.005-0.01 wt. % of chain extender and 5.0-10.0 wt. % of toughening agent blow molding, making film and shaping. Compared with casting and stretching, the invention has the advantages of short flow, convenient processing, no generation of scrap edge, high film-forming rate which can be increased by 8-10% than a stretching method, equipment investment saving, low operating cost, low production cost which can be reduced by about 20% or more and strong adaptability, adoption of various blowing measures for making the blown film, flexible and convenient product replacement and the like. Different blowing processes can be employed to obtain a non-shrinkage polyester film, and a unidirectional heat-shrinkable PETG film having approximate shrinkage rates lengthways and breadthways and giving priority to the lateral shrinkage rate. The resulting PETG thin film can be applied to a packaging film, a preservative film, a shed film, a label film and a tangle film.

Description

technical field [0001] The invention is an improvement to a PETG (polyethylene terephthalate-1,4-cyclohexanedimethanol) film and a preparation method, in particular to a blown film and a preparation method. Background technique [0002] Modified polyester PETG is synthesized by introducing 1,4-cyclohexanedimethanol monomer in the polymerization process and modifying PET by copolymerization. Compared with PET, PETG has a significantly lower crystallization rate, wider molding range, higher glass transition temperature, superior optical properties, good printability, better mechanical and processing properties, and has been applied to plates, sheets, and shrink films. , bottles, profiles and other products. Among them, heat shrinkable packaging film is one of the important uses. At present, polyethylene terephthalate-1,4-cyclohexanedimethanol (modified polyester PETG) films are basically formed by casting and stretching flat film preparation methods, that is, made of PETG an...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L23/16C08L23/08C08L23/00C08K13/02C08K3/36C08K5/20C08K3/34C08K5/521C08K5/29B29B9/06B29C47/92B29C49/04B29C48/92
CPCB29C48/10B29C48/92B29C2948/92704B29C2948/92895
Inventor 杨涛陈亚龙
Owner YIXING GUANGHUI PACKAGE
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