Viscous modified aliphatic-aromatic copolyester and preparation method thereof

A technology of aromatic copolyester and copolyester, which is applied in the field of viscosity-increasing modified aliphatic-aromatic copolyester and its preparation, can solve the problems of high melt index, low polymer viscosity, and influence on product use, and achieve increased Melt viscosity and melt strength, effects of increasing melt viscosity and improving processability

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the product has a branched chain structure before adding the organic peroxide, it is easy to cause a crosslinking reaction when reacting with the organic peroxide, which will gel the extruded product and affect the use of the product
[0004] A linear random aliphatic / aromatic copolyester described in patent ZL200510135517.2, its monomer structure is the polycondensation ester of aliphatic dibasic acid and aliphatic dibasic alcohol with the same aromatic dibasic acid and aliphatic dibasic The copolyester of the ester formed by the polyalcohol, because the copolyester structure belongs to the random linear polymer structure, the viscosity of the polymer is small, and the melt index is too large, which leads to the limitation of the processing and application of the polymer

Method used

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  • Viscous modified aliphatic-aromatic copolyester and preparation method thereof
  • Viscous modified aliphatic-aromatic copolyester and preparation method thereof
  • Viscous modified aliphatic-aromatic copolyester and preparation method thereof

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preparation example Construction

[0052] The preparation method of the present invention comprises the following steps:

[0053] In the first step, the raw material 1, raw material 2 and raw material 3 are mixed together according to the following mass ratio, fully stirred and mixed,

[0054] Raw material 2: Raw material 1 = 0.0001~0.001:1; for example: the ratio can be 0.0001:1, 0.0002:1, 0.0003:1, 0.0004:1, 0.0005:1, 0.0006:1, 0.0007:1, 0.0008:1, 0.0009:1 or 0.001:1;

[0055] Raw material 3: Raw material 1 = 0.0001~0.0002:1; for example: the ratio can be 0.0001:1, 0.00012:1, 0.00014:1, 0.00016:1, 0.00018:1 or 0.0002:1;

[0056] Preferred:

[0057] Raw material 2: Raw material 1=0.0001~0.0005:1;

[0058] Raw material three: raw material one = 0.0001~0.0002:1;

[0059] In the second step, the mixture obtained in the first step is added to a twin-screw extruder for extrusion reaction; the temperature distribution of each temperature zone of the extruder is 100-170-170-165°C;

[0060] The value of the melt ...

Embodiment 1

[0073] 0.03 g of 2,5-dimethyl-2,5-bis(t-butyl)peroxide hexane was added to 300 g of poly(butylene adipate-butylene terephthalate) copolyester (PBAT ), and then add 0.03g of triethylene glycol bis-β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate (abbreviated as 245), and the mixture is fully mixed. The mixed materials are put into a twin-screw extruder for extrusion expansion modification. The melt viscosity of the product increases significantly, and the melt index decreases significantly to 7.2, which proves that the product is a branched copolyester product, and its structure is as shown in structural formula (1), wherein m, n and p are all 4.

Embodiment 2

[0075] 0.06 g of 2,5-dimethyl-2,5-bis(t-butyl)peroxide hexane was added to 300 g of poly(butylene adipate-butylene terephthalate) copolyester (PBAT ), and then add 0.03g of triethylene glycol bis-β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate (abbreviated as 245), and the mixture is fully mixed. The mixed materials are put into a twin-screw extruder for extrusion expansion modification. The melt viscosity of the product increased significantly, and the melt index decreased significantly to 3.4, which proved that the product was a branched copolyester product, and its structure was as shown in structural formula (1), wherein m, n and p were all 4.

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Abstract

The invention relates to viscous modified aliphatic-aromatic copolyester and a preparation method thereof, in particular to biodegradable aliphatic-aromatic copolyester. A monomer of the fat-aromatic copolyester is extracted from aliphatic diacid of C2-C10, aliphatic dihydric alcohol of C2-C10 and terephthalic acid or an esterified product thereof, and then an organic peroxide is introduced underthe condition of obtaining linear random copolyester by condensation polymerization, thereby a polymerized product with increased melt viscosity is obtained. After the aliphatic-aromatic copolyester is modified by the organic peroxide, the melt index of the aliphatic-aromatic copolyester is obviously reduced, and the value (2.19kg, 190 DEG C) of the melt index MI is changed to 0.1-10g/10min from 10-50g/10min. The crystallization temperature is greatly improved, and the viscous modified aliphatic-aromatic copolyester solves the problems of bubble pipe adhesion, unstability of the bubble pipe, bubble destroy, bubble collapse and the like, thereby meeting the technique requirements of film blowing and film coating.

Description

technical field [0001] The invention relates to a biodegradable aliphatic-aromatic copolyester, in particular to a viscosity-increasing modified aliphatic-aromatic copolyester and a preparation method thereof. Background technique [0002] The currently developed biodegradable aliphatic-aromatic copolyesters are mainly produced by BASF in Germany. Its monomer structure is 1,6-adipic acid, terephthalic acid and 1,4-butanediol. BASF Company proposed in the patent U.S.Pat.No.5,817,721, 5,889,135, 6,018004, 6,046,248, 6,114,042 that in the polymerization reaction, the use of adding acid anhydride, ether, isocyanate containing multiple (at least three) functional groups that can react with polyester As a chain extender, it can significantly increase the weight average molecular weight of the copolyester (up to hundreds of thousands), but the number average molecular weight is not as high as the weight average molecular weight, and the molecular weight distribution of the produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08K5/103C08K5/101
Inventor 祝桂香吕静兰张伟闫一凡韩翎许宁
Owner CHINA PETROLEUM & CHEM CORP
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