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A kind of temperature-sensitive discoloration low-melting point polyester film and preparation method thereof

A low-melting-point polyester and temperature-sensitive discoloration technology, which is applied in the field of polyester, can solve the problems that the processing temperature of discoloration materials should not exceed 230°C, poor thermal stability of temperature-sensing discoloration materials, and limit the activity space of discoloration functional groups, etc., to achieve bright colors , Add fun and fashion, good color changing effect

Active Publication Date: 2021-07-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the processing temperature of conventional PBT polyester is above 260°C, the processing temperature of conventional PET polyester is above 280°C, and the thermal stability of thermochromic materials is poor. It will lose the color changing function, so the processing temperature of the color changing material should not exceed 230°C
At the same time, organic color-changing materials have poor acid resistance, and the content of carboxyl-terminal groups in polyester exceeds 20mol / t. The active ingredients of organic thermochromic materials will chemically react with the carboxyl-terminal groups in polyester, and the color-changing effect is very poor.
In addition, due to the high crystallinity of PBT and PET polyesters, there are more hard segments, which limits the activity space of the color-changing functional groups in the masterbatch.

Method used

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  • A kind of temperature-sensitive discoloration low-melting point polyester film and preparation method thereof
  • A kind of temperature-sensitive discoloration low-melting point polyester film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In a 20L polymerization reactor, successively add 3500 grams of terephthalic acid, 162 grams of adipic acid, 3915 grams of 1,4-butanediol, and adipic acid-based polyester diol with a molecular weight of 500 (Hua Da Chemical Group Co., Ltd. Company brand CMA-1044) 435 grams, tetrabutyl titanate 3.4 grams. Fill the reaction kettle with nitrogen to 0.1MPa, and then discharge it from the rectification column, repeat the replacement 3 times, set the temperature to heat, and carry out the esterification reaction at 180 ° C ~ 230 ° C under normal pressure conditions, esterification 3-4 hours , when the water output reaches 2000-2500mL, add 11.1 grams of cyclohexanol, react for 20 minutes, close the rectification column, open the vacuum system, gradually open the vacuum valve, and transition from low vacuum to high vacuum within 45 minutes. The internal absolute pressure is reduced to below 100Pa, and at the same time, the temperature inside the reactor is raised to 250°C~260°C...

Embodiment 2

[0030] In a 20L polymerization reactor, 3500 grams of terephthalic acid, 252.9 grams of succinic acid, 2131.5 grams of ethylene glycol, 468.5 grams of polycarbonate diol with a molecular weight of 1000, and 0.24 grams of antimony acetate were successively added. Fill the reaction kettle with nitrogen to 0.1MPa, and then discharge it from the rectification column, repeat the replacement 3 times, set the temperature to heat, and carry out the esterification reaction at 260 ° C ~ 280 ° C and a pressure of 0.2 MPa, esterification 2-2.5 When the water output reaches 1200-1400mL, release the pressure, add 20.6 grams of isoamyl alcohol, react at normal pressure for 20 minutes, close the rectification column, open the vacuum system, gradually open the vacuum valve, and transition from low vacuum to vacuum within 45 minutes. High vacuum, the absolute pressure in the reactor is reduced to below 100Pa, at the same time, the temperature in the reactor is raised to 280 ℃ ~ 300 ℃, and the po...

Embodiment 3

[0033] In a 20L polymerization reactor, add 3,000 grams of terephthalic acid, 596.9 grams of glutaric acid, 4,670.4 grams of 1,4-butanediol, 1,129.5 grams of polyε-caprolactone diol with a molecular weight of 500, tetra-titanate Butyl ester 4.2 g. Fill the reaction kettle with nitrogen to 0.1MPa, and then discharge it from the rectification column, repeat the replacement 3 times, set the temperature to heat, and carry out the esterification reaction at 180 ° C ~ 230 ° C under normal pressure conditions, esterification 3-4 hours , when the water output reaches 2000-2500mL, add 5.3 grams of n-heptanol, react for 20 minutes, close the rectification column, open the vacuum system, gradually open the vacuum valve, and transition from low vacuum to high vacuum within 45 minutes. The absolute pressure is lowered below 100Pa, and at the same time, the temperature in the reactor is raised to 250°C to 260°C, and the polymerization reaction is carried out under this condition. The polyme...

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Abstract

The invention discloses a temperature-sensitive color-changing low-melting polyester film and a preparation method thereof, belonging to the field of polyester. The method uses terephthalic acid, 1,4-butanediol or ethylene glycol as raw materials, adopts direct esterification method, and adds aliphatic dibasic acid, polyester diol and monohydroxyl end-capping agent to carry out esterification and polymerization reaction to prepare PBT or PET modified copolyester. Pulverize PET or PBT slices, mix them evenly with thermochromic materials, heat stabilizers, and antioxidants in a high-speed mixer, then use twin-screw extruders for melt blending, and pelletize to obtain thermochromic low Melting point polyester masterbatch. A three-layer low-melting-point polyester film with temperature-sensitive discoloration is prepared by using the prepared thermochromic low-melting-point polyester masterbatch as the middle layer and the low-melting-point polyester as the outer layer. The prepared temperature-sensitive color-changing polyester film has low modulus, good hand feeling, low crystallinity, good thermal adhesion and good color-changing performance, and can be widely used in the fields of automobiles, constructions, heat-sealing packaging films and the like.

Description

technical field [0001] The invention relates to the technical field of polyester, in particular to a thermochromic low-melting polyester film and a preparation method thereof. Background technique [0002] Thermochromic film refers to a functional film product whose color changes reversibly when the temperature changes. With the development of science and technology, the development and application of thermochromic films have attracted more and more attention. Chinese patent CN201320559072.0 discloses a PET film with a color-changing function. Adding a color-changing powder to PET polyester chips enables the PET film to be photosensitive and temperature-sensitive. Since the processing temperature of conventional PBT polyester is above 260°C, the processing temperature of conventional PET polyester is above 280°C, and the thermal stability of thermochromic materials is poor. The discoloration function will be lost, so the processing temperature of the discoloration material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/36B32B27/06B32B27/20
CPCB32B27/08B32B27/20B32B27/36
Inventor 张建李晶李庆男李仁海黄娟
Owner CHINA PETROLEUM & CHEM CORP
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