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Copolyester chip and its preparation method, polyester film and its use
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A polyester film and copolyester technology, used in the fields of polyester film, copolyester chips and their preparation, can solve the problems of label shrinkage deformation, deviation from shape, etc., to prevent shrinkage deformation, excellent heat resistance, controllable high sex effect
Active Publication Date: 2021-08-13
JIANGSU JINGHONG NEW MATERIAL TECH
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Problems solved by technology
When using PETG heat shrinkable film to make label packaging containers, exposure to an environment higher than 70°C will easily cause further shrinkage and deformation of the label, deviating from the original desired shape
Method used
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[0093] The preparation method of copolyester chip as above comprises the following steps:
[0094] (a) acid and alcohol blending, in the presence of catalyst and antioxidant, carry out esterification;
[0095] (b) mixing the esterification reactant obtained in step (a) with alcohol, dye and stabilizer to carry out polycondensation reaction to obtain copolyester chips.
[0096] The method is simple to operate and has high controllability, and the copolyester chip prepared by the method has good heat resistance and has an initial shrinkage temperature higher than 65°C.
[0097] Preferably, in the step (a), the esterification reaction pressure is 0.2-0.4Mpa, the reaction temperature is 245-260°C, the stirring speed is 28-35rpm, and the reaction time is 120-180min;
[0098] Typical but non-limiting examples of pressure are 0.2Mpa, 0.24Mpa, 0.28Mpa, 0.32Mpa, 0.36Mpa or 0.4Mpa.
[0099] Typical but non-limiting examples of reaction temperature are 245°C, 248°C, 250°C, 252°C, 254°C...
Embodiment 1
[0130] A copolyester chip, the copolyester chip is mainly prepared from the following raw materials: acid, alcohol, catalyst, antioxidant, dye and stabilizer;
[0132] The mass content of catalyst accounts for 275ppm of acid mass;
[0133] The mass content of antioxidant accounts for 1500ppm of acid mass;
[0134] The mass content of the dye accounts for 1ppm of the acid mass;
[0135] The mass content of the stabilizer accounts for 600ppm of the acid mass.
Embodiment 2
[0137] A copolyester chip, the copolyester chip is mainly prepared from the following raw materials: acid, alcohol, catalyst, antioxidant, dye and stabilizer;
[0138] Wherein, the acid is terephthalic acid, the alcohol includes ethylene glycol, neopentyl glycol and isosorbide, and the molar ratio of terephthalic acid, ethylene glycol, neopentyl glycol and isosorbide is 1:1.3:0.24:0.19 ;
[0139] The mass content of the catalyst accounts for 1250ppm of the acid mass;
[0140] The mass content of antioxidant accounts for 300ppm of acid mass;
[0141] The mass content of the dye accounts for 9ppm of the acid mass;
[0142] The mass content of the stabilizer accounts for 200ppm of the acid mass.
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Abstract
The invention belongs to the technical field of heat-shrinkable films, and in particular relates to a copolyesterchip and a preparation method thereof, a polyester film and an application thereof. The copolyester chips in the present invention are mainly prepared from the following raw materials: acid, alcohol, catalyst, antioxidant, dyestuff and stabilizer; wherein, the acid is terephthalic acid, and the alcohol includes ethylene glycol, neopentyl glycol and isophthalic acidSorbitol, the mol ratio of terephthalic acid, ethylene glycol, neopentyl glycol and isosorbide is 1:0.78-1.3:0.24-0.4:0.18-0.3; the mass content of catalyst accounts for 275-1250ppm of acid mass; The mass content of the oxygen agent accounts for 300-1500ppm of the acid mass; the mass content of the dye accounts for 1-9ppm of the acid mass; the mass content of the stabilizer accounts for 200-600ppm of the acid mass. Copolyester chips are prepared through esterification and polycondensation reactions, and polyester films are prepared by using copolyester chips. The polyester film has an initial shrinkage temperature higher than 65°C and a maximum shrinkage rate of more than 80%. When packaging containers into labels, further deformation and shrinkage of the labels can be avoided.
Description
technical field [0001] The invention relates to the technical field of heat-shrinkable films, in particular to a copolyester chip and a preparation method thereof, a polyester film and an application thereof. Background technique [0002] Heat shrinkable film is the main raw material for making heat shrinkable labels. Usually, the materials of heat shrinkable labels are mainly PVC (polyvinyl chloride), PETG (modified ethylene terephthalate copolyester) and OPS (uniaxially oriented polystyrene). [0003] PVC shrink film is currently the most widely used heat shrink labelfilm material. It has low cost, good transparency and moderate shrinkage. But it has the difficult problem of recycling. In addition, PVC produces highly toxic substances after burning, which is not conducive to environmental protection. It is banned or restricted in some countries and regions such as Europe and Japan. PETG shrink film has a large shrinkage rate, high transparency and good mechanical prop...
Claims
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Application Information
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