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Droplet-resistant flame-retardant modified polyester and preparation method thereof

A flame-retardant modified polyester and anti-melt drop technology, which is applied in the field of polyester, can solve the problems of increasing the amount of fluorine-based polymers, uneven dispersion, poor stability, etc., and achieve improved anti-melt drop performance and enhanced flame retardancy effect, the effect of improving droplet resistance

Inactive Publication Date: 2021-01-19
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fluoropolymers can improve the droplet resistance of polyester, the effect is limited. The reason is that there is no chemical bond connection between fluoropolymer fibers, and the fiber network structure formed by it has poor stability in polyester melt. It is difficult to greatly improve the melt strength; moreover, this problem cannot be solved by increasing the amount of fluoropolymer added, because the granulation method of melt extrusion requires the particle size of the fluoropolymer to be small, when the fluoropolymer is added When the amount increases, it is easy to agglomerate during melt blending, resulting in uneven dispersion in the polyester matrix, and the improvement of the droplet resistance of polyester is limited.

Method used

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  • Droplet-resistant flame-retardant modified polyester and preparation method thereof

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Effect test

Embodiment 1

[0032]A kind of droplet-resistant flame-retardant modified polyester, including the following raw materials in parts by weight: 88 parts of polyethylene terephthalate resin, 10 parts of zinc diethyl hypophosphite, modified carboxyl group-containing polyester with a particle size of 100 μm 5 parts of polytetrafluoroethylene particles, 2 parts of lithium chloride.

[0033] The preparation method of the above-mentioned modified polytetrafluoroethylene particles containing carboxyl groups is as follows: metal sodium is added to the solution of tetrahydrofuran and naphthalene to prepare a mixed solution with a mass fraction of metal sodium of 5%; the mixed solution is stirred at room temperature for 2 h Finally, the color of the solution is dark brown or black; immerse the polytetrafluoroethylene powder in the solution for 10 minutes; take it out and soak it in acetone solution for 5 minutes, take it out of the acetone solution, rinse it with clean water, and put it in a dark place ...

Embodiment 2

[0037] A droplet-resistant flame-retardant modified polyester, comprising the following raw materials in parts by weight: 80 parts of polyethylene naphthalate resin, 15 parts of ammonium polyphosphate, and modified polyperfluorinated polyfluoride containing carboxyl groups with a particle size of 200 μm. 6 parts of ethylene propylene particles, 3 parts of calcium chloride.

[0038] The preparation method of the above-mentioned modified polyperfluoroethylene propylene particles containing carboxyl groups is as follows: 30L of water is added to a 50L reactor, and after vacuuming until the oxygen content is less than 30ppm, 35g of perfluorooctanoate is added and the temperature is raised to 80°C; the mass ratio of the addition is 5:1 of hexafluoropropylene and tetrafluoroethylene until the pressure in the reactor is 4.5MPa, then add 7g of potassium persulfate and 7.5g of ammonium persulfate; after 30min of reaction, add 0.4g of ammonium persulfate and 8g of dibutyl peroxide acid,...

Embodiment 3

[0042] A kind of droplet-resistant and flame-retardant modified polyester, including the following raw materials in parts by weight: 72 parts of polyethylene furandicarboxylate resin, 25 parts of triphenyl phosphate, and modified polytetrafluoroethylene with a particle size of 3 mm and containing carboxyl groups. 8 parts of vinyl fluoride particles, 5 parts of zinc chloride.

[0043] The preparation method of the above-mentioned modified polytetrafluoroethylene powder containing carboxyl groups is as follows: metal sodium is added to the solution of tetrahydrofuran and naphthalene to prepare a mixed solution with a mass fraction of metal sodium of 5%; the mixed solution is stirred at room temperature After 2 hours, the color of the solution is dark brown or black; immerse the polytetrafluoroethylene powder in the solution for 10 minutes; take it out and soak it in acetone solution for 5 minutes, take it out of the acetone solution, rinse it with clean water, and put it in a dar...

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Abstract

The invention relates to the technical field of polyesters, and discloses a droplet-resistant flame-retardant modified polyester and a preparation method thereof. The modified polyester comprises thefollowing raw materials in parts by weight: 72-88 parts of polyester resin, 10-25 parts of a phosphorus-based flame retardant taking condensed phase flame retardance as a main flame retardance mechanism, 5-8 parts of modified fluorine-based polymer particles and 2-5 parts of metal salt. The preparation method comprises the following steps: uniformly mixing polyester resin, a phosphorus-based flameretardant taking condensed phase flame retardance as a main flame retardance mechanism, modified fluorine-based polymer particles and metal salt, adding the mixture into a double-screw extruder for melt blending, and performing extrusion, cooling, pelletizing and drying to obtain the droplet-resistant flame-retardant modified polyester. According to the modified polyester disclosed by the invention, by introducing the modified fluorine polymers and the metal salt, cross-linked networks capable of stably existing in polyester melt are formed between the modified fluorine polymers and between the modified fluorine polymers and the polyester, so that the modified polyester has relatively good molten drop resistance.

Description

technical field [0001] The invention relates to the technical field of polyester, in particular to a droplet-resistant flame-retardant modified polyester and a preparation method thereof. Background technique [0002] Polyester is a kind of high polymer with ester group as the main structure on the main molecular chain. Polyester has the advantages of high strength and high modulus. It is widely used in the fields of engineering plastics and synthetic fibers, including transportation, food packaging, etc. , Electronic appliances, etc. However, the highly linear structure of polyester and the low melt viscosity at high temperature make it prone to droplet. From a thermodynamic point of view, since the heat of combustion (23-24kJ / g) of polyester is much greater than its heat of fusion (0.04-0.05kJ / g), it also has a very fast heat release rate (the time from ignition to maximum heat release is less than 15s), resulting in a large heat release during the combustion process of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L27/22C08K5/5313C08K3/16C08K3/32C08K5/523
CPCC08L67/02C08K2003/323C08L2201/02C08K2003/162C08K2003/168C08L27/22C08K5/5313C08K3/16C08K3/32C08K5/523
Inventor 刘可方哲城薛增增
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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