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Photosensitive color-changing low melting point polyester film and preparation method thereof

A low-melting polyester, photochromic technology, applied in the polyester field, can solve the problems of limited activity space of color-changing functional groups, poor stability, many hard segments, etc. The effect of prolonging the use time

Active Publication Date: 2021-12-28
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 the color-changing material is poor. When the color-changing material is heated to 230°C, the active ingredients in the color-changing material will lose their color. function, so the processing temperature of color-changing materials should not exceed 230°C
At the same time, the organic color-changing material has poor acid resistance, and the carboxyl-terminal content in the polyester exceeds 20mol / t. The active ingredients of the organic photochromic material will chemically react with the carboxyl-terminus in the polyester, and the discoloration effect is very poor. In addition, because PBT and PET Polyester has higher crystallinity and more hard segments, which limits the activity space of color-changing functional groups in the masterbatch
The above patents have problems such as poor discoloration effect, poor stability, poor repeated use and poor light durability, so there are no batch products in application.

Method used

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  • Photosensitive color-changing low melting point polyester film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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

[0034]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 pol...

Embodiment 3

[0037] 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 photosensitive color-changing low melting point polyester film and a preparation method thereof, belonging to the field of film materials. The low-end carboxyl ester PET or PBT modified copolyester is pulverized, mixed evenly with photochromic materials, heat stabilizers, light stabilizers, and antioxidants, and then extruded, blended, drawn, and pelletized underwater. Prepare photochromic polyester masterbatch. The prepared photochromic polyester masterbatch and low-melting-point polyester mixed chips are used as the middle layer, and the low-melting-point polyester is used as the outer layer, which are melt-extruded, cooled, stretched, and rolled through two single-screws respectively to prepare Three-layer photochromic low-melt polyester film. The polyester film produced by this method has low modulus, good hand feeling, low crystallinity, good thermal adhesion and good discoloration performance, and can be widely used in fields such as automobiles, constructions, and heat-sealing packaging films.

Description

technical field [0001] The invention relates to the technical field of polyester, in particular to a photochromic low-melting polyester film and a preparation method thereof. Background technique [0002] Photochromic film is a functional optical film product. At present, most of the films that can change color use electric field (electrochromism) to present color. Without the action of electric field, color change cannot be realized, which limits its application range. [0003] With the development of science and technology, the development and application of photochromic films have attracted more and more attention. At present, only the Chinese patent CN201320559072.0 discloses a PET film with a color-changing function. Adding a color-changing powder to PET polyester chips realizes the effect of photosensitive and temperature-sensitive PET film. Since the processing temperature of conventional PBT polyester is above 260°C, the processing temperature of conventional PET p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08K5/523C08K5/134C08J5/18B32B27/06B32B27/18B32B27/36
CPCC08J5/18B32B5/16B32B27/14B32B27/36C08J2367/02C08K5/523C08K5/1345B32B2250/244B32B2264/0285B32B2307/40
Inventor 张建李晶李庆男李仁海黄娟
Owner CHINA PETROLEUM & CHEM CORP
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