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
CN102432855AActive Publication Date: 2012-05-02CHINA PETROLEUM & CHEM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2012-05-02

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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.
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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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