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Preparation method of submicron PET (polyethylene terephthalate) microspheres

A submicron, microsphere technology, applied in the field of engineering plastics, can solve the problems of difficulty in preparing PET microspheres, difficulty in forming heterogeneous emulsions, etc., and achieve the effect of simple method and resource cost saving.

Inactive Publication Date: 2014-04-02
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solvents of PET are all strong polar solvents, and large pieces of PET precipitation will be obtained by direct dissolution-precipitation method, and it is difficult for polar solvents and water to form heterogeneous emulsions
The melting point of PET is about 260°C, and it is also difficult to prepare PET microspheres using this method

Method used

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  • Preparation method of submicron PET (polyethylene terephthalate) microspheres
  • Preparation method of submicron PET (polyethylene terephthalate) microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At room temperature, add 50g of heated and melted phenol into 100g of tetrachloroethane, stir to obtain a clear and transparent solvent; add 2g of waste PET resin particles to 98g of solvent, then heat to 95°C, stir until the PET resin particles are completely dissolved, and cool to room temperature, obtain the PET solution, and keep it sealed;

[0026] Dissolve 1.8g of sodium dodecyl sulfate (SDS) in 88.2g of water to prepare an SDS aqueous solution with a mass concentration of 2%, then add 10g of the PET solution obtained in step a to it, and use a high-speed dispersing homogenizer at 1× 10 4 Emulsify at a rotational speed of r / min for 3 minutes to obtain a stable white PET emulsion;

[0027] Put absolute ethanol in an ultrasonic cleaner, and add PET emulsion to it drop by drop. With the addition of PET emulsion, the ethanol gradually changes from clear and transparent to light blue, until it just turns white, stop adding PET emulsion , to obtain a milky white suspe...

Embodiment 2

[0030] Mix 50 g of heated and melted phenol and 100 g of tetrachloroethane evenly, and cool to room temperature to obtain a clear and transparent solution. Add 2g of waste PET resin particles to 98g of solvent, then heat to 95°C, stir until the PET resin particles are completely dissolved, cool to room temperature to obtain a PET solution, and keep it sealed;

[0031] At room temperature, dissolve 1.8g of sodium dodecyl sulfate (SDS) in 88.2g of water to prepare an SDS aqueous solution with a mass concentration of 2%, then add 10g of the PET solution obtained in step a to it, and use a high-speed dispersing homogenizer Take 1×10 4 Emulsify at a rotational speed of r / min for 3 minutes to obtain a stable white PET emulsion;

[0032] Put this PET emulsion in an ultrasonic cleaner, and under the action of ultrasound, drop absolute ethanol (dropping speed is about 0.25mL / s) to break the emulsion. The obtained product is precipitated, centrifuged, and then ultrasonically cleaned i...

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Abstract

The invention discloses a preparation method of submicron PET microspheres. The preparation method is characterized by being carried out according to the following steps: preparing PET solution by using mixed solution of phenol and tetrachloroethane as a solvent, and using PET resin particles as solute; adding the PET solution into water solution of lauryl sodium sulfate, emulsifying to obtain PET emulsion; mixing PET emulsion with demulsifying agent to obtain white precipitate, and washing the white precipitate to obtain the submicron PET microspheres. According to the invention, the submicron PET microspheres are prepared by an emulsifying-demulsifying method; the preparation method is simple, and solves the problems that boiling point of the PET solvent is high, the PET microspheres cannot be obtained by solvent evaporation, moreover, each PET solvent with single component is a polar solvent and the PET solution formed by the polar solvent cannot prepare steady emulsion.

Description

technical field [0001] The invention relates to a preparation method of submicron PET microspheres, which is prepared by recycling PET (polyethylene terephthalate) resin particles through processes such as dissolution, emulsification, and demulsification. field of engineering plastics. technical background [0002] Due to its high hardness, excellent dimensional stability, chemical stability, thermal stability, physiological inertness and low production cost, PET is widely used in textile processing, food packaging, mechanical equipment, biomedicine, optical materials, It is a widely used thermoplastic in many fields such as the information industry. However, since PET is a highly crystalline polymer with no hydrophilic groups in its molecular chain, its surface energy is high and its compatibility with other substances is poor, which limits the use of PET to a large extent. Adsorption, bonding, dyeing, printing and electroplating, etc., are used in some processes involvin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/16C08J3/07C08G63/183
Inventor 汪谟贞徐永飞葛学武
Owner UNIV OF SCI & TECH OF CHINA