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Ecological multifunctional ternary copolymerization PETG (Polyethylene Terephthalate Glycol) polyester, preparation method of polyester, and method for preparing unidirectional stretching heat-shrinkable film from polyester

A heat-shrinkable film, multi-functional technology, applied in the field of polymer materials, can solve the problems of polluted environment, low strength, low strength of heat-shrinkable film, etc., and achieve the effects of reducing production cost, good structural regularity, and easy recycling.

Active Publication Date: 2012-07-11
河南银金达新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the price of CHDM is about 30,000 yuan per ton, which is very expensive; moreover, this method will also produce harmful substances such as methanol esters, which will pollute the environment
The deficiency of this method is: (1) this method needs to use the higher isophthalic acid of price, thereby increased production cost
(2) Since the introduction of isophthalic acid destroys the regularity of macromolecular chains, thereby reducing the force between macromolecules, the PETG polyester has higher flexibility and lower strength, and the PETG polyester is made of The strength of the formed heat shrinkable film is low
(3) The transparency and thermal shrinkage rate of the heat shrinkable film made of this polyester are not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (Example 1, ecological multifunctional ternary copolymerized PETG polyester and preparation method thereof)

[0017] The terpolymerized PETG polyester in this embodiment is formed by copolymerizing terephthalic acid, neopentyl glycol, and ethylene glycol at a molar ratio of 1:0.46:1.35.

[0018] Concrete preparation method is as follows:

[0019] ①Esterification reaction: 9.08kg of terephthalic acid, 2.65kg of neopentyl glycol, 4.5kg of diethanol, 8.1kg of ethylene glycol antimony as a catalyst, 1.7g of triphenyl phosphate as a stabilizer And 1.7g of triphenyl phosphite as a stabilizer was put into the beating kettle for beating for 1 hour, then the slurry was forced into the esterification kettle and heated to 230°C for esterification reaction, and the temperature at the top of the fractionation tower of the esterification kettle was controlled at 100 ℃. When the esterification water separated in the carrying out of the esterification reaction reached about 2kg, the ...

Embodiment 2～ Embodiment 4）

[0024] Each embodiment is basically the same as Embodiment 1, and the differences are shown in Table 1.

[0025] Table 1

[0026] Example 1 Example 2 Example 3 Example 4 Terephthalic acid 9.08kg 9.08kg 9.08kg 9.08kg Neopentyl glycol 2.65kg 0.5688kg 1.72kg 3.69kg ethylene glycol 4.5kg 5.9kg 5.3kg 4.1kg Ethylene glycol antimony 8.1g 7.0g 9.0g 8.1g stabilizer Triphenyl phosphate 1.7g, triphenyl phosphite 1.7g Triphenyl phosphate 1.7g, triphenyl phosphite 1.7g Triphenyl phosphate 1.6g, triphenyl phosphite 1.5g Triphenyl phosphate 1.5g, triphenyl phosphite 1.9g Intrinsic viscosity (η) 0.756 0.782 0.761 0.778 melting point 235℃ 165℃～180℃ 232℃ 170℃～185℃

Embodiment 5

[0027] (Example 5, the method for preparing longitudinally stretched heat-shrinkable film by ecological multifunctional ternary copolymerized PETG polyester)

[0028] The method of the present embodiment has the following steps:

[0029] 1. The ecological multifunctional ternary copolymerized PETG polyester obtained in Example 1 was continuously added to a twin-screw extruder for melt plasticization. The temperature of each zone of the twin-screw extruder is: zone 1 180°C, zone 2 220°C, zone 3 235°C, zone 4 255°C, zone 5 255°C.

[0030] ②The molten and plasticized melt is fed into the forming casting mold, and passed through the cooling roller to form the casting strip. The temperature of each zone of the forming casting belt mold is: zone 1 245°C, zone 2 245°C, zone 3 245°C, zone 4 250°C, zone 5 250°C, zone 6 245°C, zone 7 245°C, zone 8 245°C. The cooling roll temperature is 28°C to 30°C.

[0031] ③ performing longitudinal far-infrared stretching on the cast strip sheet ob...

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Abstract

The invention discloses an ecological multifunctional ternary PETG (Polyethylene Terephthalate Glycol), a preparation method of the polyester, and a method for preparing a unidirectional stretching heat-shrinkable film from the polyester. The ecological multifunctional ternary copolymerization PETG polyester is formed by ternary monomer copolymerization of terephthalic acid, neopentyl glycol and glycol, wherein the molar ratio of terephthalic acid to neopentyl glycol to glycol is 1: (0.1-0.65):(1.2-1.75). The preparation method comprises esterification reaction and polymerization, wherein the temperature of the esterification reaction is 200 DEG C to 255 DEG C, the temperature of the polymerization is 270 DEG C to 280 DEG C, and the vacuum degree of the polymerization is 0.098 MPa to 0.1 MPa. The price of raw materials of the ecological multifunctional ternary copolymerization PETG polyester is low, so that the manufacturing cost is reduced, and the structural regularity of the PETG polyester is good, so that the strength is high. The heat-shrinkable film prepared from the obtained ecological multifunctional ternary copolymerization PETG polyester according to the invention is high in strength, transparency and heat shrinkage.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to an ecological multifunctional ternary copolymerized PETG polyester, a preparation method thereof, and a method for preparing a uniaxially stretched heat-shrinkable film from the polyester. Background technique [0002] At present, most of the protective films used on some food packaging, sleeve labels, and labels are PVC heat shrinkable films, and its usage is more than 200,000 tons per year. This PVC material is not only harmful to human health, but also seriously pollutes the natural environment. Developed countries such as Europe, America and Japan have already banned all kinds of PVC heat shrinkable film materials. [0003] The full name of PETG polyester is polyethylene terephthalate-1,4-cyclohexanedimethanol ester, which is an amorphous polyester with toughness, weather resistance, chemical resistance, environmental protection, economic characteristics. At pre...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/86C08L67/02B29C69/02B29C55/04B29C71/02
Inventor 姚雪远严莜梅
Owner 河南银金达新材料股份有限公司
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