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Transparent modified copolyester and its sheet material preparation method

A copolyester and modification technology, applied in the field of modified copolyester, can solve problems such as easy sticking to the wall, high cost, and difficulty in drying slices, and achieve the effect of easy drying, solving the problem of sticking to the wall, and wide processing conditions

Active Publication Date: 2012-05-02
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent 200510040004.3 "A preparation process for multi-component copolymerization modified PETG polyester" discloses a copolymerization modified PETG polyester, whose ingredients are terephthalic acid, isophthalic acid, neopentyl glycol, ethylene glycol and metal catalysts , its molar ratio is PTA: IPA=1: 0.08~0.80, (PTA+IPA): MEG: NPG=1: 1.20~1.75: 0.08~40; The copolyester IPA, NPG content that this patent synthesis is higher, crystallization It is mainly suitable for the manufacture of low melting point polyester and heat shrinkable film, etc., and is not suitable for the manufacture of transparent plates, and its cost is high, and the drying of slices is difficult, and it is easy to stick to the wall

Method used

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  • Transparent modified copolyester and its sheet material preparation method
  • Transparent modified copolyester and its sheet material preparation method
  • Transparent modified copolyester and its sheet material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Add 150kg of purified terephthalic acid, 66.5kg of ethylene glycol, 9.4kg of neopentyl glycol, and 60g of ethylene glycol antimony into a 300L polymerization reactor, and carry out esterification at 210°C-250°C and 0.2-0.3 MPa reaction. When the water output reaches 30L, release the system pressure to normal pressure, raise the temperature in the reactor to about 280°C, and reduce the pressure below 100Pa at the same time. Under this condition, the reaction time is determined according to the change of the stirring power of the polymerization tank. Copolyester A (carboxyl-terminated content 38.8mol / t, diethylene glycol content 2.66%) with an intrinsic viscosity [η] of 0.664 was produced, and finally discharged and pelletized through nitrogen pressing.

[0068] In order to further obtain the copolyester of higher intrinsic viscosity, carry out viscosification with certain heating program in vacuum drying drum to obtain intrinsic viscosity [η] be the copolyester B of 0.77...

Embodiment 2

[0074] Add 142.5kg of purified terephthalic acid, 7.5kg of purified isophthalic acid, 67kg of ethylene glycol, 14kg of neopentyl glycol, and 60g of ethylene glycol antimony into a 300L polymerization reactor. The esterification reaction is carried out at ~0.3 MPa. When the water output reaches 30L, release the system pressure to normal pressure, raise the temperature in the reactor to about 280°C, and reduce the pressure below 100Pa at the same time. Under this condition, the reaction time is determined according to the change of the stirring power of the polymerization tank. A copolyester with an intrinsic viscosity [η] of 0.687 (carboxyl-terminated content of 22.7mol / t and diethylene glycol content of 2.68%) was produced, and finally discharged and pelletized through nitrogen extrusion.

[0075] The prepared copolyester was analyzed by nuclear magnetic resonance (NMR), and the molar ratio of (PTA+IPA):MEG:NPG was 1:0.89:0.11, and the molar ratio of PTA:IPA was 1:0.05.

[00...

experiment example 1

[0078] According to the preparation method described in Example 2, the following copolyesters were prepared;

[0079] When the IPA content is zero:

[0080]

[0081] Tg represents glass transition temperature, Tcc represents cold crystallization temperature, ΔHc represents cold crystallization enthalpy, Tm represents melting temperature; ΔHm represents melting enthalpy; Tmc represents thermal crystallization temperature; ΔHmc thermal crystallization enthalpy;

[0082] The lower the ΔHc, ΔHm, and ΔHmc, the lower the crystallinity.

[0083] ΔTcc is the difference between Tcc and Tg, which is called the degree of superheating. The smaller ΔTcc is, the easier the sample is to crystallize; ΔTmc is the difference between Tm and Tmc, which is called the degree of supercooling. The smaller the ΔTmc, the easier the sample crystallizes.

[0084] It can be seen from the above table that with the increase of NPG, the values ​​of ΔTcc and ΔTmc increase, indicating that the crystallini...

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Abstract

The invention relates to a modified copolyester and its preparation method, especially to a transparent modified copolyester and its sheet material preparation method. Raw materials contain purified terephthalic acid, glycol, neopentylene glycol and / or m phthalic acid. The mol ratio of each structural unit in the transparent modified copolyester is: PTA:IPA=1:0-0.1, (PTA+IPA):MEG:NPG=1:0.60-0.99:0.01-0.40. According to the transparent modified copolyester, its intrinsic viscosity is 0.5-0.7dl / g and its melting point is 200-239 DEG C. With the increase of NPG and IPA, crystallizability of the copolyester is reduced and its transparency is increased. By controlling the copolymerization components, the copolyester with different crystallization degrees and different intrinsic viscosities is prepared, thus satisfying different needs of the market.

Description

technical field [0001] The invention relates to a modified copolyester, in particular to a transparent modified copolyester and its plate, and a preparation method thereof. Background technique [0002] In recent years, the application of polyethylene terephthalate (PET) in the non-fiber field has grown rapidly, but due to the inherent crystallinity and other properties of PET, its processing performance in sheet applications is not good, especially for the preparation of transparent When the plate is used, the transparency is not high. Copolymerization modification is required in the synthesis. In the 1980s, the American Eastman Company developed a new variety of polyester - PETG. It is a modified copolyester obtained by adding 1,4-cyclohexanedimethanol (CHDM) during the polymerization of PET for co-condensation. PETG is a microcrystalline copolyester, which has excellent impact resistance, high transparency, chemical resistance, γ-ray resistance, excellent fluidity, uni...

Claims

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Application Information

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IPC IPC(8): C08G63/672C08G63/78B29C47/92B29C48/92
CPCB29C48/92B29C48/875B29C2948/92704B29C2948/92895
Inventor 迟克栋姜润喜左志俊罗欣张俊韩朝阳尹华
Owner CHINA PETROLEUM & CHEM CORP
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