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Preparation method of polyester film with high heat shrinkage

A technology of polyester film and shrinkage rate, which is applied in the field of preparation of polyester film with high heat shrinkage rate, can solve the problems of increasing melting strength, complicated production process, and difficulty in making, and achieves good heat resistance effect, improved heat resistance, Good heat shrink effect

Active Publication Date: 2013-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent 200610128532 discloses a modified copolyester and a method for making a heat-shrinkable polyester film. The modified copolyester contains terephthalic acid, ethylene glycol, and a first modifier for destroying crystallinity , and a branching agent for increasing melt strength, wherein the first modifier is selected from 1,3-dihydroxy-2-methylpropane, 1,-dihydroxy-2-methylpropane alkoxy Esters, 2,5-dimethyl-2,5-hexanediol, or their combination, the branching agent is a compound with at least three reactive groups by itself or after ring opening, wherein each reactive group The group is selected from OH, COOH, NCO, NH 2 , epoxy or COOR, where R is C 1 -C 18 The alkyl group, the patent adds at least two kinds of modifiers, and the production process is more complicated
The copolyester blend described in this patent is suitable for the preparation of thermoformed products resistant to UV radiation, mainly using 1,4-cyclohexanedimethanol, anti-ultraviolet absorbers and biphenyl dicarboxylic acid modified polyester, wherein 1, The price of 4-cyclohexanedimethanol is relatively high, and it is not easy to obtain

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 5.7kg PTA, 0.438kg4, 4'-biphenyl dicarboxylic acid, 3.8kgEG, 2.096g ethylene glycol antimony in a 20L general-purpose polymerization reactor, and carry out esterification reaction at 230~265°C and 0.2~0.3Mpa (Table Under pressure), the esterification reaction is carried out. When the water output reaches 1300ml, the pressure is released to normal pressure, 1.23g of triphenyl phosphate is added, stirred at normal pressure for 10 minutes, the temperature is raised to 280°C and the pressure is lowered to below 100Pa, and the reaction is 1 to 3 Hour. After the reaction is completed, it is extruded by a melt pump, pelletized, and dried to obtain polyester chips for heat-shrinkable films with an intrinsic viscosity of 0.707 dl / g.

[0024] Pre-crystallize the obtained heat-shrinkable film with polyester chips, dry, extrude, bidirectionally stretch gradually, set the shape, and cool to form a single-layer film. The extrusion temperature is 275-285°C, the longitudinal drawi...

Embodiment 2

[0026] Add 4.8kg of PTA, 1.235kg of 4,4'-biphenyl dicarboxylic acid, 3.8kg of EG, 2.885g of antimony acetate into a 20L general-purpose polymerization reactor, and carry out esterification reaction at 230-265°C and 0.2-0.3Mpa (gauge pressure) Carry out the esterification reaction at low temperature. When the water output reaches 1300ml, release the pressure to normal pressure, add 0.528g trimethyl phosphate, stir at normal pressure for 10 minutes, raise the temperature to 280°C and reduce the pressure to below 100Pa, and react for 1 to 3 hours. After the reaction is completed, it is extruded by a melt pump, pelletized and dried to obtain polyester chips for heat-shrinkable films with an intrinsic viscosity of 0.698dl / g.

[0027]Pre-crystallize the obtained heat-shrinkable film with polyester chips, dry, extrude, bidirectionally stretch gradually, set the shape, and cool to form a single-layer film. The extrusion temperature is 275-285°C, the longitudinal drawing temperature is...

Embodiment 3

[0029] Add 4.4kg PTA, 1.6kg4,4'-biphenyl dicarboxylic acid, 3.7kgEG, 1.183g germanium dioxide in a 20L general-purpose polymerization reactor, and carry out esterification reaction at 230~265°C and 0.2~0.3Mpa (gauge pressure ) for esterification reaction, when the water output reaches 1300ml, release the pressure to normal pressure, add 1.008g triethyl phosphate, stir for 10 minutes at normal pressure, raise the temperature to 280°C and lower the pressure to below 100Pa, and react for 1 to 3 hours . After the reaction is completed, it is extruded by a melt pump, pelletized, and dried to obtain polyester chips for heat-shrinkable films with an intrinsic viscosity of 0.701 dl / g.

[0030] Pre-crystallize the obtained heat-shrinkable film with polyester chips, dry, extrude, bidirectionally stretch gradually, set the shape, and cool to form a single-layer film. The extrusion temperature is 275-285°C, the longitudinal drawing temperature is 90°C, the transverse drawing temperature ...

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Abstract

The invention discloses a preparation method of a polyester film with high heat shrinkage. The method comprises steps of: carrying out an esterification reaction on terephthalic acid, 4, 4 '-biphenyldicarboxylic acid and ethylene glycol under the effect of catalyst, and adding a stabilizer to conduct a subsequent polycondensation reaction, so as to obtain a polyester slice; drying and conducting melt extrusion on the polyester slice at 265-285 DEG C, and subjecting the polyester slice to a vertical and horizontal two-way stretch with stretching ratio of 3.0-4.5:1 at 80-115 DEG C; and finally shaping to prepare a polyester film with single-layer structure and high heat shrinkage. According to the invention, polyester is subjected to drying, extrusion, stretching and shaping to prepare the polyester film with high heat shrinkage; and compared with a conventional polyester film prepared under same conditions, the polyester film provided by the invention has good heat shrinkage effect, and good heat resistance.

Description

technical field [0001] The invention belongs to the field of polymer chemical industry, and in particular relates to the preparation of a polyester film with high thermal shrinkage rate. Background technique [0002] Polyethylene terephthalate film has excellent physical and chemical properties and can be widely used in many fields. Polyester (PET) high heat shrinkage film is a new type of heat shrinkable packaging material. Because it is easy to recycle, non-toxic, tasteless, good mechanical properties, especially in line with environmental protection, polyester (PET) has become an ideal substitute for polyvinyl chloride (PVC) high heat shrinkage film in developed countries. [0003] Ordinary polyester is a crystalline high polymer. To obtain a polyester film with a high heat shrinkage rate, it is necessary to carry out copolymerization modification on the ordinary polyester raw material, namely polyethylene terephthalate. [0004] In order to improve the thermal shrinkag...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08G63/185C08G63/183B29C69/02B29C55/12B29C47/92B29L7/00B29C48/92
CPCB29C48/92B29C2948/92704B29C2948/92923
Inventor 戴钧明杨胜林王树霞李光江建民
Owner CHINA PETROLEUM & CHEM CORP
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