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A preparing method of aliphatic/aromatic copolyester

A technology of aromatic and copolyester, which is applied in the field of copolyester synthesis and preparation, can solve the problems of restricting the scale-up industrial production of biodegradable aliphatic-aromatic copolyester, not suitable for continuous production, waste of manpower and material resources, etc. , to achieve the effect of streamlining equipment, less addition amount and improving reaction speed

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two-step esterification method has cumbersome feeding steps, complicated procedures, long reaction time, waste of manpower and material resources, and is not suitable for continuous production, which restricts the scaled-up industrial production of biodegradable aliphatic-aromatic copolyesters

Method used

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  • A preparing method of aliphatic/aromatic copolyester
  • A preparing method of aliphatic/aromatic copolyester
  • A preparing method of aliphatic/aromatic copolyester

Examples

Experimental program
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Effect test

Embodiment 1～5

[0032] 1) Esterification: Add 70.63g (0.425mol) terephthalic acid, 55g (0.466mol) succinic acid (0.466mol), 108.3g (1.20mol) 1,4-butanediol into a 500ml three-neck flask, and add titanium catalyst at the same time C-94 (provided by Sachtleben, Germany) and synergistic catalyst (provided by Shanghai Sinopharm Group, see Table 2), nitrogen protection, stirring and heating, the reaction temperature is controlled at 150-230 ° C, the esterification water is collected, and the end is completed after 2.5 hours reaction;

[0033]2) Prepolymerization: After the reaction is finished, the system is slowly evacuated, the vacuum degree is 200-300Pa, the temperature is 230-250℃, and the duration is 1-2 hours;

[0034] 3) Polycondensation: Then apply a high vacuum, the vacuum degree is ≤100pa, the temperature is 240-260°C, and the duration is 3-5h. The white product is aliphatic / aromatic copolyester.

[0035] The reaction conditions of each step of Examples 1-5 are shown in Table 1, and the...

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Abstract

The invention relates to a preparing method of aliphatic / aromatic copolyester. The method includes: subjecting raw material monomers comprising an aromatic diacid, an aliphatic (alicyclic) diacid and an aliphatic (alicyclic) dihydric alcohol to esterification at 150-230 DEG C under the function of a titanium catalyst and a synergistic catalyst; subjecting the reaction system to prepolymerization at 230-260 DEG C under a vacuum degree of 200-300 Pa for 1-2 h; and subjecting products of the prepolymerization to polycondensation at 240-270 DEG C under a vacuum degree not more than 200 Pa for 3-5 h to obtain the aliphatic / aromatic copolyester. The preparing method adopts a direct esterification method and omits a transesterification method, thus avoiding production of methanol that is a byproduct and reducing environment pollution. The preparing method obviously shortens the esterification time, simplifies processes and equipment, and provides technical support for continuous industrial production of the aliphatic / aromatic copolyester.

Description

technical field [0001] The invention belongs to the field of synthesis and preparation of copolyesters, in particular to a preparation method of aliphatic / aromatic copolyesters. Background technique [0002] Due to the good biodegradability and biocompatibility of aliphatic polyesters such as polyhydroxyalkanoate (PHA) and polylactide (lact) ester, they have received widespread attention during the initial research and development of polyesters. However, with the deepening of research, aliphatic polyester has gradually exposed its own disadvantages: low melting point, poor mechanical properties, difficult to meet the various requirements for material properties in practical applications; high raw material costs, high product prices , These have become the bottleneck restricting the further development of aliphatic polyester. Thermoplastic aromatic polyester has stable thermal properties, excellent mechanical properties, easy processing, and low price. Since its industrializ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/199C08G63/78C08G63/85
Inventor 陆慧辉谭晓玲瞿中凯金永龙王雁周芬董艳
Owner CHINA PETROLEUM & CHEM CORP
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