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High-temperature self-crosslinking anti-flaming anti-dripping copolyester based on Schiff base structure and preparation method thereof

A Schiff base, self-crosslinking technology, applied in the high temperature self-crosslinking flame retardant anti-droplet copolyester and its preparation field, can solve the problem of limited application scope, large addition amount, polyester can not be spun and processed into Film and other problems, to achieve the effect of improving melt viscosity, reducing preparation cost, excellent flame retardant and anti-droplet

Active Publication Date: 2016-01-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using such substances together with traditional flame retardants can make polyester obtain a certain flame-retardant and anti-droplet effect, but their addition is large, so that the resulting polyester cannot be used for spinning and processing into films, and can only be used Used as an engineering plastic, thus limiting its range of applications

Method used

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  • High-temperature self-crosslinking anti-flaming anti-dripping copolyester based on Schiff base structure and preparation method thereof
  • High-temperature self-crosslinking anti-flaming anti-dripping copolyester based on Schiff base structure and preparation method thereof
  • High-temperature self-crosslinking anti-flaming anti-dripping copolyester based on Schiff base structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 388g dimethyl terephthalate, 210mL ethylene glycol, 18.1g 4-(2-hydroxyethoxy) benzaldehyde acetal 4-(2-hydroxyethoxy) aniline Schiff base, 2.2g zinc acetate and 0.16 g tetrabutyl titanate was added to the reaction kettle, filled with nitrogen to remove the air in the kettle, and carried out the transesterification reaction at 180-210°C under normal pressure for 3-5 hours; ~ 1.5 hours, and then under high vacuum (pressure <60Pa) at 230 ~ 260 ° C for 1 ~ 3 hours after polycondensation, discharge, water cooling.

[0045] The intrinsic viscosity [η] of the copolyester is 0.71dL / g; the limiting oxygen index is 25.5%; the vertical combustion rating is V-2, and the peak heat release rate p-HRR in the cone calorimetry test is 704kW / m 2 .

Embodiment 2

[0047] 388g dimethyl terephthalate, 210mL ethylene glycol, 30.1g 4-(2-hydroxyethoxy) benzaldehyde acetal 4-(2-hydroxyethoxy) aniline Schiff base, 2.2g zinc acetate and 0.16 g of tetrabutyl titanate was added to the reaction kettle, and after the transesterification and polycondensation reactions were carried out according to the steps and conditions given in Example 1, the material was discharged.

[0048] The intrinsic viscosity [η] of the copolyester is 0.66dL / g; the limiting oxygen index is 28.0%; the vertical combustion rating is V-1, and the peak heat release rate p-HRR in the cone calorimetry test is 624kW / m 2 .

Embodiment 3

[0050] 388g dimethyl terephthalate, 210mL ethylene glycol, 60.2g 4-(2-hydroxyethoxy) benzaldehyde acetal 4-(2-hydroxyethoxy) aniline Schiff base, 2.2g zinc acetate and 0.16 g antimony trioxide was added to the reaction kettle, and after transesterification and polycondensation were carried out according to the steps and conditions given in Example 1, the material was discharged.

[0051] The intrinsic viscosity [η] of the copolyester is 0.67dL / g; the limiting oxygen index is 29.5%; the vertical combustion rating is V-1, and the peak heat release rate p-HRR in the cone calorimetry test is 546kW / m 2 .

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Abstract

The invention discloses high-temperature self-crosslinking anti-flaming anti-dripping copolyester based on a Schiff base structure. The high-temperature self-crosslinking anti-flaming anti-dripping copolyester is obtained by introducing structural units represented in III or IV on the basis of polyester structural units represented in I and II and carrying out random copolymerization. The intrinsic viscosity number [eta] of copolyester is 0.30-1.10 dL / g, and the limit oxygen index is 24.0-40.0%; the vertical flame class is V-2-V-0; the peak heat release rate p-HRR in a cone calorimeter test is lowered by 33-83% compared with pure PET. The invention further discloses a preparation method of the high-temperature self-crosslinking anti-flaming anti-dripping copolyester. The introduced crosslinking group is a Schiff base group, and the anti-flaming anti-dripping efficiency is high, so that the melt viscosity of polyester can be rapidly improved through the self-crosslinking group char formation effect and stable chemical crosslinking without adding other fire retardant, and the copolyester has the excellent anti-flaming and anti-dripping performance.

Description

technical field [0001] The invention belongs to the technical field of high-temperature self-crosslinking flame-retardant anti-droplet copolyester and its preparation. Specifically, the present invention relates to a copolyester containing a Schiff base structure with high-temperature self-crosslinking, flame retardancy and drop resistance and a preparation method thereof. Background technique [0002] Polyethylene terephthalate (PET) is not only used in synthetic fibers for its high modulus, high strength, high elasticity, excellent shape retention, heat resistance and chemical resistance, good surface hardness and gloss It accounts for a huge share, and at the same time, as engineering plastics, it also plays a great role in people's lives. However, polyester itself is inherently flammable and easy to melt and drip, which limits its application in some important fields, such as electronic devices, flame-retardant protective clothing and military uniforms, vehicles and hig...

Claims

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Application Information

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IPC IPC(8): C08G63/685C08G63/78
Inventor 王玉忠吴嘉宁付腾汪秀丽王晓琳郭德明倪延鹏陈力
Owner SICHUAN UNIV
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