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High-char-forming, low-smoke, flame-retardant, anti-droplet copolyester based on aromatic ketone structure and its preparation method

A low-smoke flame-retardant and copolyester technology is applied in the field of new low-smoke flame-retardant and anti-melting droplet copolyester and its preparation field, which can solve the problems of polyester fusible droplets, toxic fumes, release, etc., and achieve barrier The effect of smoke release, reduction of heat release, and increase of flame retardants

Inactive Publication Date: 2020-03-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to solve the problems of "flammability", "melt drop" and "toxic smoke release" of polyester at the same time by traditional flame retardant methods. Therefore, it is necessary to adopt a new flame retardant mechanism so that it can give polyester good Flame retardant anti-droplet performance and low smoke emission properties

Method used

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  • High-char-forming, low-smoke, flame-retardant, anti-droplet copolyester based on aromatic ketone structure and its preparation method
  • High-char-forming, low-smoke, flame-retardant, anti-droplet copolyester based on aromatic ketone structure and its preparation method
  • High-char-forming, low-smoke, flame-retardant, anti-droplet copolyester based on aromatic ketone structure and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 960g of terephthalic acid, 360g of ethylene glycol, 1728g of 3,5-bis(2-hydroxyethoxy)benzophenone and 0.360g of ethylene glycol antimony into the reactor, and fill the reactor with nitrogen to remove the air in the reactor , pressurize to 0.1MPa, raise the temperature to 200°C within 2h to start the esterification reaction, control the pressure in the kettle to 0.3-0.4MPa, after maintaining for 1.5h, the pressure begins to decrease, and after 1.5h, the temperature gradually rises to 220°C, the pressure drops After reaching normal pressure, the esterification reaction is completed; after that, the polycondensation reaction is carried out at 230-240°C for 0.5h in low vacuum, and then the temperature is raised to 250°C for 2h in high vacuum (pressure <60Pa).

[0045] The intrinsic viscosity [η] of the copolyester is 0.77dL / g; the limiting oxygen index is 39.0; the vertical combustion level is V-0, and no droplet is produced from two ignition to extinguishment in vertica...

Embodiment 2

[0047] 960g of terephthalic acid, 360g of ethylene glycol, 175g of 3,4-bis(2-hydroxyethoxy)benzophenone and 0.360g of ethylene glycol antimony were added to the reaction kettle, according to the method given in Example 1 Steps and conditions After the esterification and polycondensation reactions are carried out, the material is discharged.

[0048] The intrinsic viscosity [η] of the copolyester is 0.61dL / g; the limiting oxygen index is 30.0; the vertical combustion level is V-1, and no droplet is produced from two ignition to extinguishment in vertical combustion; cone calorimetry test Medium peak heat release rate PHRR is 439kW / m 2 , the total smoke release TSR is 1429m 2 / m 2 .

Embodiment 3

[0050] 960g of terephthalic acid, 360g of ethylene glycol, 1550g of 3,4-diacetoxybenzophenone and 0.360g of ethylene glycol antimony were added to the reactor, and the esterification was carried out according to the steps and conditions given in Example 1. After chemical reaction and polycondensation reaction, the material is discharged.

[0051] The intrinsic viscosity [η] of the copolyester is 0.69dL / g; the limiting oxygen index is 37.5; the vertical combustion level is V-0, and there is no droplet from two ignition to extinguishment in vertical combustion; cone calorimetry test The peak heat release rate PHRR is 363kW / m 2 , the total smoke release TSR is 1443m 2 / m 2 .

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Abstract

The invention discloses a high char-forming low-smoke flame-retardant and anti-melt dripping copolyester based on an arone structure and a preparation method thereof. The copolyester is composed of structural units I, II and III, and has an intrinsic viscosity [eta] of 0.51-1.87dL / g, a limit oxygen index of 26.0-39.5, a vertical combustion level of V-2 to V-0, and in a cone calorimetry test, the peak heat release rate (PHRR) is reduced by 34.2-71.2% than that of pure polyester, and the total smoke release TSR is reduced by 26.6-61.8% than that of pure polyester. As the arone structure introduced by the invention can capture aliphatic free radical at high temperature to form stable aromatic heterocycle and further be aromatized into a special flake structure char layer, the copolyester canhave high char-forming ability, excellent flame retardance and melt dripping resistance, and low smoke release, and the preparation method of the copolyester is basically consistent to that of pure polyester, thus being more advantageous in industrial production.

Description

technical field [0001] The invention belongs to the technical field of high-char formation, low-smoke, flame-retardant and droplet-resistant copolyester and its preparation. Specifically, the present invention relates to a carbon layer that can trap aliphatic free radicals at high temperature to form a stable aromatic heterocycle, and can be further aromatized into a special sheet-like structure. Flame-retardant and drop-resistant copolyester and its preparation method. This type of copolyester only needs to add modified monomers containing aryl ketone structure, and the aryl ketone structure can be used to capture the aliphatic free radicals generated by the breakage of polymer chain segments during combustion, form aromatic heterocycles and rapidly aromatize into special The charcoal layer of sheet structure has the characteristics of blocking the release of smoke, improves the charcoal-forming ability of polyester, reduces the release of smoke when polyester is burned, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/672
CPCC08G63/672
Inventor 王玉忠付腾吴嘉宁陈琳刘博文倪延朋汪秀丽郭德明陈力
Owner SICHUAN UNIV
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