Preparation method of heat shrinkable polyester film

A technology of copolyester and heat shrinkage, applied in the preparation of copolyester film and the preparation of heat shrinkable copolyester film, can solve the problems of unsatisfactory tensile strength, shrinkage uniformity, no heat shrinkage rate, etc. Excellent transparency, uniform shrinkage, and easy recycling

Active Publication Date: 2013-06-26
JIANGSU SHUANGXING COLOR PLASTIC NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese patent 201210017355.2 discloses a method for preparing an ecological multifunctional ternary copolymerization PETG polyester and a method for preparing a uniaxially stretched heat-shrinkable film from the polyester; the PETG polyester described in the patent is composed of terephthalic acid, neopentyl Diol and ethylene glycol ternary monomers are copolymerized, and the molar ratio of terephthalic acid, neopentyl glycol and ethylene glycol is 1: (0.1-0.65): (1.2-1.75); the preparation method includes Esterification reaction and polymerization reaction, the temperature of esterification reaction is 220-265°C, the temperature of polymerization reaction is 270°C-280°C, and the vacuum degree of polymerization reaction is 0.098MPa-0.1MPa; the PETG polyester heat described in this patent Shrink film has good transparency and heat shrinkage rate, but the tensile strength and shrinkage uniformity are not ideal
The film described in this invention is a non-heat-shrinkable material with almost no heat shrinkage, so it can only be used for electronic labels

Method used

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  • Preparation method of heat shrinkable polyester film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 2.5Kg purified terephthalic acid, 2.5Kg multi-component dibasic acid (including naphthalene dicarboxylic acid, isophthalic acid, biphenyl dicarboxylic acid), 2.8Kg ethylene glycol, 0.5Kg Multi-component glycols (including isosorbide, butylene glycol, diethylene glycol, triethylene glycol, 1,4-cyclohexanedimethanol, neopentyl glycol) and 9 g ethylene glycol antimony catalyst, 160 g titanium dioxide Anti-adhesive agent, 10g silicate modifier, 1.2g stearamidopropyl dimethyl-β-hydroxyethylammonium dihydrogen phosphate antistatic agent, 0.9g isocyanate chain extender, at 230~260℃ , 0.2 ~ 0.3Mpa conditions for esterification, when the water output reaches 1100mL theoretical value, release the system pressure to normal pressure.

[0026] React under these conditions, add 1.6g of triethyl phosphate stabilizer, stir at normal pressure for 7 minutes, raise the temperature in the reactor to 285°C, and drop the pressure below 100Pa, react under these conditions for 3 hours, and...

Embodiment 2

[0029]Add 2.6Kg purified terephthalic acid, 2.4Kg multi-component dibasic acid (including naphthalene dicarboxylic acid, isophthalic acid, biphenyl dicarboxylic acid), 2.7Kg ethylene glycol, 0.6Kg Multi-component diols (including isosorbide, butanediol, diethylene glycol, triethylene glycol, 1,4-cyclohexanedimethanol, neopentyl glycol) and 8g tetrabutyl titanate catalyst, 150g Titanium dioxide anti-adhesive agent, 20g silicate modifier, 1.1g stearamidopropyl dimethyl-β-hydroxyethyl ammonium dihydrogen phosphate antistatic agent, 0.8g isocyanate chain extender, at 230-260 The esterification reaction is carried out under the conditions of 0.2-0.3Mpa and 0.2-0.3Mpa, and when the water output reaches the theoretical value of 1100mL, the system pressure is released to normal pressure.

[0030] React under these conditions, add 1.5g of triethyl phosphate stabilizer, stir at normal pressure for 7 minutes, raise the temperature in the reactor to 285°C, and drop the pressure below 100P...

Embodiment 3

[0033] Add 2.7Kg purified terephthalic acid, 2.3Kg multi-component dibasic acid (including naphthalene dicarboxylic acid, isophthalic acid, biphenyl dicarboxylic acid), 2.6Kg ethylene glycol, 0.7Kg Multi-component glycols (including isosorbide, butanediol, diethylene glycol, triethylene glycol, 1,4-cyclohexanedimethanol, neopentyl glycol) and 9g antimony acetate catalyst, 130g titanium dioxide anti-sticking Binder, 30g silicate modifier, 1.2g stearamidopropyldimethyl-β-hydroxyethylammonium dihydrogen phosphate antistatic agent, 0.9g isocyanate chain extender, at 230~260℃, 0.2 The esterification reaction is carried out under the condition of ~0.3Mpa, and when the water output reaches the theoretical value of 1100ml, the system pressure is released to normal pressure.

[0034] React under these conditions, add 1.6g of triethyl phosphate stabilizer, stir at normal pressure for 9 minutes, raise the temperature in the reactor to 285°C, and drop the pressure below 100Pa, react under...

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Abstract

The invention discloses a preparation method of a heat shrinkable polyester film. The method comprises the following steps of: carrying out esterification and condensation polymerization reaction on multi-component dicarboxylic acid and multi-component dihydric alcohol in the presence of a catalyst, a stabilizing agent, an antistatic agent, a chain extender, an anti-caking agent or a modifying agent to prepare a multi-component polyester; carrying out melt extrusion, extension and pelleting on the multi-component polyester to prepare a multi-component polyester slice; and carrying out melted extrusion, die head casting, transverse far infrared drawing, cooling molding, rolling and cutting on the multi-component polyester slice to prepare the heat shrinkable polyester film. The heat shrinkable polyester film with high shrinkage percentage prepared by using the method is pretty high in strength and heat shrinkage performance, excellent in transparency, malleability, and toughness, good in glossiness, uniform in shrinkage, non-toxic, odorless, and easy to recycle, and a product of the film is suitable for labels for various containers and direct packaging of a food product, a beverage product, an electronic product, an electric product, a mechanical product, a hardware product and the like.

Description

technical field [0001] The invention relates to a method for preparing a heat-shrinkable copolyester film, more specifically, the invention relates to a method for preparing a copolyester film with a high transverse shrinkage rate, and belongs to the technical field of polymer materials. Background technique [0002] In recent years, heat-shrinkable films made of materials such as polyvinyl chloride (PVC), polystyrene (PS), and polyethylene terephthalate (PET) have been widely used in labels for various containers and food and beverage, Electronics, machinery and other fields. [0003] Heat-shrinkable polyvinyl chloride film was first used because of its excellent shrinkage performance and transparency, but because it often produces a large amount of hydrogen chloride and dioxin and other gases during incineration, it is not conducive to recycling and does not meet environmental protection requirements. is now restricted. [0004] Heat-shrinkable polystyrene film has good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/03C08K3/22C08K3/26C08K3/32C08K5/098C08K3/30C08K3/34C08K5/20C08G63/672C08G63/78B29B9/06B29D7/01B29C47/92B29C55/08B29C48/92
CPCB29C48/08B29C48/04
Inventor 吴培服
Owner JIANGSU SHUANGXING COLOR PLASTIC NEW MATERIALS
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