Solid phase polymerization process for preparing ethylene telephthalate and aromatic diamine copolymer

A polyethylene terephthalate and aromatic binary technology, which is applied in the field of aromatic diamine copolymers, can solve the problems of expensive nucleating agents, poor dimensional stability, and slow crystallization speed. easy effect

Inactive Publication Date: 2006-05-17
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the three major restrictive factors in the application of PET at present, the melt strength is poor, the crystallization speed is slow, and the dimensional stability is poor, so it cannot meet the needs of rapid injection molding in industry.
Therefore, unique rapid crystallization additives have emerged at the historic moment. These commercialized PET engineering plastic products have a relatively high crystallization rate, but the addition of nucleating agents during processing is expensive, which has become a bottleneck restricting their large-scale application.

Method used

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  • Solid phase polymerization process for preparing ethylene telephthalate and aromatic diamine copolymer
  • Solid phase polymerization process for preparing ethylene telephthalate and aromatic diamine copolymer
  • Solid phase polymerization process for preparing ethylene telephthalate and aromatic diamine copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The synthesis of embodiment 1 PET-DDS (5mol%) copolymer

[0032]Dry the PET slices in an ordinary oven at 110°C for one day, and mix them with DDS for later use. The temperature of each zone of the twin-screw is set at 220, 260, 240, and 220° C., and the extruded mixture sample is granulated through a condensation water tank. The blend chips were dried at 60°C and pre-crystallized at 90°C for 4h. Solid state polymerization yields copolymer chips of desired viscosity in 5-30 hours. Solid state polymerization temperature: 210°C nitrogen protection (anti-oxidation, and take away small molecular by-products); nitrogen protection rapid sampling does not exceed 5 minutes.

[0033] sample

[0034] The synthesis and viscosity-increasing process of the resulting copolymers are shown in the attached image 3 shown.

Embodiment 2

[0035] The preparation of embodiment 2 PET-DDS (2mol%)

[0036] Put the PET slices in an ordinary oven at 90°C for 4 hours, then dry them in a vacuum oven at 120°C for 4 hours, mix them with DDS and set them aside. The temperature of each zone of the twin-screw is set at 220, 260, 244, and 230° C., and the extruded mixture sample is granulated through a condensation water tank. The blend slices were dried at 6°C and pre-crystallized at 90°C for 4h. Solid state polymerization yielded copolymer chips with the desired intrinsic viscosity of 0.64±0.02 in 40 hours. Solid phase polymerization temperature: 240°C nitrogen protection (anti-oxidation, and take away small molecular by-products).

Embodiment 3

[0037] Example 3 PET-DDS (2%) was used as a masterbatch to obtain PET-DDS (0.1mol%, 0.5mol% and 2mol%)

[0038] project

Pure PET

PET / 0.1%DD

S

PET / 0.5%DDS

PET / 2%DDS

Screw temperature / ℃

I

II

III

IV

metering pump and

Bending temperature / ℃

Cabinet temperature / ℃

aspect ratio

Spinneret specification / mm*f

Spinning speed / m min -1

Stretch ratio

Heat roller temperature / ℃

Hot plate temperature / ℃

Denier (dtex) (10 4 )

Elongation at break (%)

Breaking strength (CN / dtex)

290

305

298

295

295

310

2.0

0.3*36

800

3.8

80

160

1.0515

7.201

2.44

290

305

298

295

295

310

2.0

0.3*36

800

3.8

80

135

1.0177

32.435

3.67

290

305

280

280

295

310

2.0

0.3*36

800

3.8

80

160

1...

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PUM

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Abstract

The present invention relates to solid phase polymerization process for preparing ethylene terephthalate and aromatic diamine copolymer. The copolymer is prepared with polyethylene terephthalate as aromatic diamine monomer in certain ratio, and through the first mixing, extruding and pelletizing in a double screw extruder, slicing and drying, and the subsequent solid phase condensation polymerization inside a solid phase polymerization reactor to obtain the copolymer through the ester exchange reaction between the monomer and polyethylene terephthalate. The present invention introduces aromatic diamine into the main chain of polyethylene terephthalate to make the copolymer possess the advantages of both polyester and polyamide. The preparation process is simple and suitable for industrial production.

Description

technical field [0001] The invention mainly relates to the copolymerization modification of polyethylene terephthalate (PET), and furthermore relates to a method for preparing a copolymer of polyethylene terephthalate and aromatic diamine by solid phase polymerization. Background technique [0002] Polyethylene terephthalate (PET) is a linear macromolecule. Because the main chain contains a para-benzene ring, the macromolecular chain is rigid, and -OCO-CH 2 -CH 2 -The existence of the base makes it have a certain degree of flexibility. This structure endows PET with excellent mechanical strength, electrical insulation, heat resistance and chemical resistance. At present, PET is mainly used in the fields of fibers, bottles and films, and is widely used. widely. However, there are currently three restrictive factors in the application of PET, such as poor melt strength, slow crystallization speed, and poor dimensional stability, so it cannot meet the needs of rapid injection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91B29B9/12B29C47/40C08G69/30
Inventor 余木火刘洋
Owner DONGHUA UNIV
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