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Copolyester containing imide structure and preparation method thereof

A technology containing imide and copolyester, applied in the field of materials, can solve the problems of no suitable alternative materials, etc., and achieve the effect of easy implementation, simple preparation method and good controllability

Active Publication Date: 2021-05-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the mainstream suppliers of water cups and kitchen appliances choose not to use BPA-PC for health considerations, but there is still no suitable alternative material available

Method used

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  • Copolyester containing imide structure and preparation method thereof
  • Copolyester containing imide structure and preparation method thereof
  • Copolyester containing imide structure and preparation method thereof

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preparation example Construction

[0032] The present invention also provides a kind of preparation method of copolyester as above, comprises the following steps:

[0033] (1) Mix terephthalic acid or its esterified product, ethylene glycol, esterification catalyst and glycol monomer, and carry out esterification reaction to obtain the first intermediate product, wherein the glycol monomer includes At least one of bis-N-(2-hydroxyethyl)pyromellitic diimide or bis-N-(2-hydroxyethyl)biphenyltetracarboxylic diimide, the bis-N The structural formula of -(2-hydroxyethyl) pyromellitic acid diimide is shown in the following formula (2), and the structural formula of the two-N-(2-hydroxyethyl) biphenyltetracarboxylic acid diimide is as follows Formula (3) shows:

[0034]

[0035] (2) The first intermediate product is subjected to a polycondensation reaction to obtain a copolyester containing an imide structure.

[0036] In step (1), the esterified product of terephthalic acid includes dimethyl terephthalate. In v...

Embodiment 1

[0056] Dimethyl terephthalate 48.5g (0.25mol), bis-N-(2-hydroxyethyl) pyromellitic acid diimide 12.2g (0.04mol) and ethylene glycol 22.3g (0.36mol) It was added to the polymerization reactor, and then 0.15% of anhydrous zinc acetate based on the molar amount of dimethyl terephthalate was added. Under an inert atmosphere, react at 190° C. for 5 h to obtain the first intermediate product.

[0057] Add 0.2% antimony trioxide, 0.12% triphenyl phosphate and 0.15% antioxidant 1010 based on the molar weight of dimethyl terephthalate to the first intermediate product, and gradually reduce the vacuum to below 100Pa , gradually raising the temperature to 295° C., and reacting for 5 hours to obtain a copolyester containing an imide structure as shown in formula (4).

[0058] After testing, the relative number average molecular mass of the imide-containing copolyester is 22800g / moL, and the relative weight average molecular mass is 38400g / moL. 1 H-NMR such as figure 1 As shown, the str...

Embodiment 2

[0060] 48.5g (0.25mol) of dimethyl terephthalate, 3.0g (0.01mol) of bis-N-(2-hydroxyethyl) pyromellitic diimide and 24.2g (0.39mol) of ethylene glycol It was added to the polymerization reactor, and then 0.15% of anhydrous zinc acetate based on the molar amount of dimethyl terephthalate was added. Under an inert atmosphere, react at 160° C. for 4 hours to obtain the first intermediate product.

[0061] Add 0.2% antimony trioxide, 0.15% triphenyl phosphate and 0.1% antioxidant 1010 based on the molar weight of dimethyl terephthalate to the first intermediate product, and gradually reduce the vacuum to below 100Pa , gradually raising the temperature to 280° C., and reacting for 2.0 hours to obtain a copolyester containing an imide structure as shown in formula (4).

[0062] After testing, the relative number average molecular mass of the copolyester containing imide structure is 31000g / moL, the relative weight average molecular mass is 54000g / moL, bis-N-(2-hydroxyethyl) pyromel...

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Abstract

The invention relates to a copolyester containing an imide structure and a preparation method thereof, the structural formula of the copolyester containing an imide structure is shown in the following formula (1): wherein, R is at least one of, Both x and y are integers of 1-20, and z is an integer of 20-100. The preparation method of the present invention is simple, and the Tg of the obtained copolyester containing imide structure reaches 95°C-120°C, has excellent heat resistance, transparency and mechanical properties, and can be used to manufacture baby feeding bottles, children's toys, water cups, Kitchen supplies and electronic appliances, etc.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a copolyester containing an imide structure and a preparation method thereof. Background technique [0002] Currently, bisphenol A polycarbonate (BPA-PC) is mainly an impact-resistant and transparent polymer material with a glass transition temperature (Tg) greater than 100°C. However, BPA-PC will slowly release bisphenol A during use, which can cause poor growth in babies, induce cancer and lead to metabolic disorders and so on. Therefore, the European Union has banned the use of BPA-PC in baby food packaging and contact areas, and China has also banned the use of BPA-PC in baby food contact containers. Therefore, mainstream suppliers of water cups and kitchen appliances have chosen not to use BPA-PC for health considerations, but there is still no suitable alternative material available. Contents of the invention [0003] Based on this, it is necessary to provide a copoly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/685
CPCC08G63/6856
Inventor 慎昂王静刚刘小青张小琴孙藜源代金月朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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