Polyester composition as well as preparation method and application thereof

A composition and polymer technology, applied in the field of polyester, can solve problems such as lack of anti-ultraviolet performance, increased carboxyl content, difficulty in uniform dispersion of nanoparticles, etc.

Active Publication Date: 2021-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical scheme of the present invention adopts the titanium series catalyst in order to realize the effect of low content of polyester carboxyl end and further realize the technical effect of hydrolysis resistance, and solve the problem that other catalyst systems cause the content of polyester end carboxyl group to be on the high side; the use of nanometer white pigment is to Realize the anti-ultraviolet effect, and solve the technical problem that most polyester products do not have excellent anti-ultraviolet performance in the prior art; the alkali metal salt of polyphosphoric acid is used to modify the surface of nano-white pigment particles to help it in the polymerization process. Dispersion in the body and for the thermal stability of the polyester composition, solve the problem that the nanoparticles in the prior art are difficult to uniformly disperse in the polyester and the content of carboxyl groups at the end of the polyester chips is obvious after thermal processing such as extrusion and stretching The problem of rising; the use of alkali metal salts of polyphosphoric acid also solves the problem that small molecular phosphorus stabilizers in the prior art are easy to form inactive compounds with catalysts

Method used

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  • Polyester composition as well as preparation method and application thereof
  • Polyester composition as well as preparation method and application thereof
  • Polyester composition as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0064] Preparation of Catalyst A:

[0065] Add 12.4 grams (0.2 mol) of ethylene glycol in the reactor that stirrer, condenser and thermometer are equipped with, in reactor, slowly drip into tetraisopropyl titanate 28.4 grams (0.1mol), separate out white precipitate, After reacting at 70°C for 2 hours, the product was centrifuged, and the residue was washed with distilled water three times, and the product was vacuum-dried at 70°C to obtain a white powdery substance.

[0066] The dried white powdery substance is placed in a reactor with agitator, condenser and thermometer, 50 grams of ethylene glycol, 32 grams of 25% aqueous sodium hydroxide solution (0.2 mol) in mass fraction, 18 grams of lactic acid (0.2 mol), and reacted for 2 hours at a reaction temperature of 150° C. to obtain a nearly colorless homogeneous liquid, which was Catalyst A.

Embodiment 1

[0068] With 600 grams of terephthalic acid, 300 grams of ethylene glycol, catalyst A (based on the weight of the polyester polymer that finally generates, the weight of titanium atoms is 5 ppm), potassium tripolyphosphate (based on the polyester polymer that finally generates by weight, the weight of phosphorus atoms is 40ppm) and anatase titanium dioxide (average particle diameter 30nm, based on the weight of the polyester polymer that is finally generated, the mass fraction of anatase titanium dioxide is 2%), made into Mix the slurry, add it to the reaction kettle, and carry out the esterification reaction. The esterification temperature is 230-255° C., the pressure is 0.25 MPa, and the water generated by the reaction is discharged through the rectification device. After the esterification is completed, it is reduced to normal pressure and enters the pre-condensation stage. Vacuumize and decompress until the system pressure is maintained at 500 Pa, and the liquid phase temper...

Embodiment 2

[0071] With 600 grams of terephthalic acid, 300 grams of ethylene glycol, catalyst A (based on the weight of the polyester polymer that finally generates, the weight of titanium atoms is 5 ppm), potassium tripolyphosphate (based on the polyester polymer that finally generates by weight, the weight of phosphorus atoms is 40ppm) and anatase titanium dioxide (average particle diameter 30nm, based on the weight of the polyester polymer that is finally generated, the mass fraction of anatase titanium dioxide is 15%), made into Mix the slurry, add it to the reaction kettle, and carry out the esterification reaction. The esterification temperature is 230-255° C., the pressure is 0.25 MPa, and the water generated by the reaction is discharged through the rectification device. After the esterification is completed, it is reduced to normal pressure and enters the pre-condensation stage. Vacuumize and decompress until the system pressure is maintained at 500 Pa, and the liquid phase tempe...

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Abstract

The invention discloses a polyester composition as well as a preparation method and application thereof. The polyester composition comprises 4 to 50 ppm of a titanium element, 0.1 to 100 ppm of a phosphorus element and 1.5 to 30% of a nano white filler. The phosphorus element is derived from an alkali metal salt of polyphosphoric acid contained in the polyester composition, and the nano-white filler is selected from a nano-white pigment having a refractive index being greater than 1.50 at 20 DEG C. The preparation method comprises the step of carrying out esterification and condensation polymerization on components including dicarboxylic acid, alkylene glycol, a titanium source, a phosphorus source and a white filler to obtain the polyester composition. The polyester composition can be used for producing film materials such as photovoltaic backboards. The polyester composition is low in terminal carboxyl group content, meets the technical requirement of hydrolysis resistance, and achieves better ultraviolet resistance.

Description

technical field [0001] The invention relates to the technical field of polyester, in particular to a polyester composition and its preparation method and application. Background technique [0002] The back sheet film is an important part of the photovoltaic module, which protects and supports the cells in the module, and requires reliable electrical performance, water vapor barrier performance and UV aging resistance. Traditionally, metal aluminum alloy is used as the back plate, but due to its heavy weight, large thickness, and inconvenient construction and transportation, more and more batteries use polyvinyl fluoride (PVF) and PET composite film as the back plate, of which the PET film is used as the base. The fluorine film is used as the weather-resistant layer, and the two are bonded by an adhesive layer to form a composite backsheet film. Another type of fluorine-containing backsheet film is prepared by coating fluorine-containing coatings on the surface of the base f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08K3/22C08K3/32C08G63/85C08G63/183H01L31/049
CPCY02E10/50
Inventor 熊文韬王睿况军章瑛虹熊金根
Owner CHINA PETROLEUM & CHEM CORP
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