Highly transparent copolyester preparation method

A copolyester and transparent technology, applied in the field of polyester modification, can solve the problems of toxic methanol and high production cost, and achieve the effect of high transparency, reduced consumption and bright gloss.

Inactive Publication Date: 2006-07-12
SINOPEC OILFIELD SERVICE CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the production method of the above-mentioned copolymer is that the production cost is high, and toxic methanol will be produced in the reaction process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] A preparation method of highly transparent copolyester, described method comprises the following three steps:

[0013] 1. Two dicarboxylic acids of terephthalic acid and isophthalic acid, ethylene glycol and 1,4-cyclohexanedimethanol are used as reaction raw materials, and in the presence of a catalyst, the temperature is 210~ Under the conditions of 265°C and pressure of 100-450Kpa, react for 60-200 minutes to form esterified products;

[0014] 2. Add the toner and phosphorus stabilizer to the esterified product obtained in step (1), and stir to make it evenly mixed with the esterified product;

[0015] 3. Under the negative pressure condition of temperature between 260-290°C and pressure between 10-300Pa, the mixture in step 2 is subjected to polycondensation reaction to form copolyester with intrinsic viscosity not lower than 0.5dL / g.

[0016] The molar ratio between the total amount of two kinds of dibasic alcohols and the total amount of two kinds of dicarboxylic ...

Embodiment 1

[0021] Add 203 grams of ethylene glycol, 95 grams of 1,4-cyclohexanedimethanol, 400 grams of terephthalic acid, 36 grams of isophthalic acid and a catalyzer in a 2.5 liter stainless steel reactor, the contents of each element of the catalyst are respectively : Titanium 42ppm, sodium 13ppm, cobalt 160ppm, manganese 40ppm, in the case of stirring, the temperature is between 220-230 ℃, the pressure is between 200-250Kpa, react for 160 minutes to form an ester, add 22ppm phosphorus to the ester to stabilize Toner and 2ppm organic toner, polycondensate the esterified product for 80 minutes at a temperature of 270-280°C and a pressure of 10-100Pa under reduced pressure to obtain a copolyester, the viscosity of the copolyester is 0.818dL / g, the light transmittance is 91%.

Embodiment 2

[0023] Add 95 grams of 1,4-cyclohexanedimethanol, 400 grams of terephthalic acid, 203 grams of ethylene glycol, 36 grams of isophthalic acid and a catalyst in a 2.5 liter stainless steel reactor, the contents of each element of the catalyst are respectively : Titanium 90ppm, sodium 14ppm, cobalt 110ppm, manganese 46ppm, stir and heat up, at a temperature of 230-245°C, a pressure of 200-250Kpa, esterification reaction for 90 minutes to form an esterified product, and then add 88ppm to the esterified product Phosphorus stabilizer and 2ppm organic toner, under reduced pressure conditions with a temperature of 270-285°C and a vacuum of 10-100Pa, the esterified product was polycondensed for 120 minutes to obtain a copolyester, and the copolymerization The ester viscosity is 0.72dL / g, and the light transmittance is 87%.

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Abstract

The invention relates to a method for preparing for high grade of transparency copolyester, which comprises the following steps: 1. using two kinds of dicarboxilic acid: terephthalic acid and m-phthalic acid, glycol and two kinds of diatomic alcohol: 1, 4-cyclohexane 2-methyl alcohol as reaction raw material to react and form esterifying substance on the condition of existing catalyst, the temperature: 210-265 deg., the pressure: 100-450 KPa and the time: 60-200min; 2. adding the toner and phosphate stabilizer into the esterifying substance, stirring it to mix them; 3. doing polycondensation reaction to the mixer of the step 2 to form the copolyester with the character viscosity more than 0.5dL/g on the condition of the temperature: 260-290 deg., the negative pressure: 10-300 Pa.

Description

technical field [0001] The invention relates to modification of polyester, in particular to a method for preparing highly transparent copolyester by adding reactive components. Background technique [0002] Polyethylene terephthalate, also known as polyester, is a common polymer with a wide range of uses. The performance requirements of polyester used in different occasions are also different. Therefore, polyester modification has always been a research topic. The copolyester modified by isophthalic acid and 1,4-cyclohexanedimethanol has high transparency and is a raw material that can be used to manufacture polyester bottles, polyester sheets, polyester films and other products. [0003] In the past, the production method for synthesizing this copolyester mainly included: the initial transesterification reaction, that is: reacting dimethyl terephthalate, ethylene glycol and 1,4-cyclohexanedimethanol under the action of a catalyst, Prepare ethylene terephthalate and by-pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/181C08G63/78
Inventor 翟丽鹏杜明
Owner SINOPEC OILFIELD SERVICE CORPORATION
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