Copolyester with low melting point and synthesis method thereof

A technology of copolyester and polyethylene glycol, which is applied in the field of low melting point copolyester and its synthesis, can solve the problems of serious side reactions and unstable product performance, and achieves reduction of production cost, serious side reactions, and molecular weight and low molecular weight. The effect of uniform distribution of functional groups

Inactive Publication Date: 2010-06-16
ZHONGFU GUANGHAN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a low-melting-point novel polyester with a melting point of 170-220°C and a synthesis method thereof. By selecting appropriate monomers to participate in copolymerization, the problems of serious side reactions and unstable product performance in the reaction process are solved.

Method used

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  • Copolyester with low melting point and synthesis method thereof
  • Copolyester with low melting point and synthesis method thereof
  • Copolyester with low melting point and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] The semi-continuous polymerization process is adopted, and the test device is a 50kg / batch semi-continuous small-scale polymerization device, which is composed of a slurry tank, an esterification tank 1, an esterification tank 2, a polycondensation tank, and a vacuum system.

[0116] Step 1: Prepare slurry

[0117] Put 33.75 kilograms of PTA, 11.25 kilograms of IPA, 21.5 kilograms of EG and 5 grams of phosphoric acid into the slurry kettle, and stir well. The molar ratio of PTA:IPA in the slurry is 75:25; the acid-alcohol molar ratio of the slurry is 1:1.28; the added amount of the stabilizer is 100ppm.

[0118] The second step: esterification 1 reaction

[0119] Add the slurry in batches to the esterification tank with half the amount of the previous batch of esterification liquid left to carry out the esterification reaction. The reaction is carried out under normal pressure, and the temperature of the material is controlled between 230 and 255 ° C. After 2 hours of ...

Embodiment 2

[0131] The semi-continuous polymerization process is adopted, and the test device is a 50kg / batch semi-continuous small-scale polymerization device, which is composed of a slurry tank, an esterification tank 1, an esterification tank 2, a polycondensation tank, and a vacuum system.

[0132] Step 1: Prepare slurry

[0133] Put 38.92 kilograms of PTA, 6.08 kilograms of IPA, 22.6 kilograms of EG and 5 grams of phosphoric acid into the slurry tank, fully and evenly. The molar ratio of the slurry PTA:IPA is 86.5:13.5; the acid-alcohol molar ratio of the slurry is 1:1.345; the added amount of the stabilizer is 100ppm.

[0134] The second step: esterification 1 reaction

[0135] Add the slurry in batches to the esterification tank with half the amount of esterification liquid left in the previous batch to carry out the esterification reaction. The reaction is carried out under normal pressure, and the temperature of the material is controlled between 250 and 260 ° C. After 2 hours o...

Embodiment 3

[0151] Sample Preparation

[0152] The A1 sample is the novel polyester produced by the formula and method provided in embodiment two.

[0153] A2 sample is the polyester produced according to the method provided in Example 2 without adding DEG.

[0154] A3 sample is 30.15 kilograms of PTA, 14.85 kilograms of IPA (the molar ratio of PTA:IPA is 67:33), without adding DEG, the polyester produced according to the method provided in Example 2.

[0155] The product qualities of the three samples are shown in the table below.

[0156] Table 4

[0157]

Sample serial number

intrinsic viscosity

(dl / g)

Melting point (DSC)

℃

Melting point (microscope)

℃

Color value

A1

0.73

none

175-200

L85a-0.1b4.0

A2

0.75

213.5

228

L87a-0.2b3.5

[0158]

Sample serial number

intrinsic viscosity

(dl / g)

Melting point (DSC)

℃

Melting poi...

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Abstract

The invention discloses polyester with an extensive amorphous region. The components of terephthalic acid, m-phthalic acid and dihydric alcohol and a dihydroxy compound with an ether bond are used as basic raw materials, an acid component contains 10-30 percent by mol of m-phthalic acid and 70-90 percent by mol of terephthalic acid, total acid and total alcohol are prepared into uniform slurry inthe mol ratio of 1.05:2.0, and the polyester which does not have an obvious melting peak under a DSC (differential scanning calorimetry) and has the extensive amorphous region and low melting point is generated by the reactions of esterification and polycondensation. The method can utilize a traditional semicontinuous and continuous polyester production line to realize industrialized production. The polyester produced by utilizing the method provided by the invention is used for preparing a packaging film, a sheet, a hot melt adhesive and the like. The invention is especially suitable for being prepared into a thermal contraction film used for a packaging purpose or a tag purpose so as to replace a polyvinyl chloride (PVC) thermal contraction film used in the market at present.

Description

technical field [0001] The invention utilizes the third component to carry out acid modification on the polyester, and utilizes the fourth component to carry out alcohol modification on the polyester. Thereby a method of preparing polyesters with lower melting points and lower crystallinity properties. Background technique [0002] Heat shrinkable films have been widely used in different fields. Polyethylene, polyester, polyvinyl chloride (PVC), etc. can all be used to make heat shrinkable films. However, it is very difficult to print on polyethylene film. Polyester heat shrinkable film requires a higher shrinkage temperature (usually above 100°C), while PVC heat shrinkable film is famous for its excellent processing, shrinkage performance, good transparency and The advantage of low cost has become the most widely used heat shrinkable film material in the market, but the use of PVC shrinkable film has caused serious environmental problems. Therefore, a new type of materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/78C09J167/02B65D65/02B65D65/38
Inventor 晋忠周洋苏湘通钟友建陈彬秦光泽
Owner ZHONGFU GUANGHAN CHEM IND
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