Composition of halogen-free flame-retardant ethylene/vinyl acetate copolymer of phosphorus-containing heterocyclic compound

A vinyl acetate copolymer and vinyl acetate copolymerization technology, applied in conductors, electrical components, circuits, etc., can solve problems such as low elongation at break, and achieve the effects of excellent flame retardant performance, good rheological properties, and simple processing technology

Active Publication Date: 2013-09-18
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But both have a disadvantage: the elongation at break of the material is relatively low, the former does not exceed 60%, and the latter only reaches 18.9%.
At present, it has been found that in the case of flame-retardant ethylene-vinyl acetate copolymers, there are silica, carbon nanotubes, silicone rubber, siloxane, etc. that have a synergistic effect with metal hydroxides. Regarding metal hydroxides and organophosphorus heterocyclic compounds There is no report on the literature of synergistic flame retardant ethylene-vinyl acetate copolymer

Method used

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  • Composition of halogen-free flame-retardant ethylene/vinyl acetate copolymer of phosphorus-containing heterocyclic compound
  • Composition of halogen-free flame-retardant ethylene/vinyl acetate copolymer of phosphorus-containing heterocyclic compound
  • Composition of halogen-free flame-retardant ethylene/vinyl acetate copolymer of phosphorus-containing heterocyclic compound

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Composition and weight percent of composition are:

[0063] Ethylene-vinyl acetate copolymer 44wt%

[0064] Magnesium hydroxide 48wt%

[0065] DOPO 8wt%

[0066] Weigh 26.4g of ethylene-vinyl acetate copolymer, 28.8g of magnesium hydroxide and 4.8g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (abbreviated as DOPO), After pre-mixing the above components uniformly, knead in an internal mixer at 135° C. for 10 minutes to obtain the EVA / MDH / DOPO composition. The mixing equilibrium torque of the composition is 9.0 Nm, the limiting oxygen index is 37%, the tensile strength is 11.7 MPa, and the elongation at break is 158%.

Embodiment 2

[0068] Composition and weight percent of composition are:

[0069] Ethylene-vinyl acetate copolymer 42wt%

[0070] Aluminum hydroxide 53wt%

[0071] DOPO 5wt%

[0072] Weigh 25.2g of ethylene-vinyl acetate copolymer, 31.8g of aluminum hydroxide and 3.0g of DOPO, after pre-mixing the above components uniformly, at 150°C, knead in an internal mixer for 13 minutes to obtain Halogen flame retardant EVA / ATH / DOPO composition. The mixing equilibrium torque of the composition is 9.6Nm, the limiting oxygen index is 41%, the tensile strength is 12.5MPa, and the elongation at break is 122%.

Embodiment 3

[0074] Composition and weight percent of composition are:

[0075] Ethylene-vinyl acetate copolymer 45wt%

[0076] Magnesium hydroxide 50wt%

[0077] The compound shown in structural formula IV 5wt%

[0078] First weigh 27.0g of ethylene-vinyl acetate copolymer and add it to the internal mixer. After it melts, add 30.0g of magnesium hydroxide and 3.0g of the compound shown in the structural formula IV, and mix in the internal mixer at 135°C After kneading in the machine for 10 minutes, the kneading equilibrium torque of the obtained composition was 8.8 Nm, the limiting oxygen index was 39%, the tensile strength was 11.6 MPa, and the elongation at break was 167%.

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Abstract

The invention belongs to the field of halogen-free flame-retardant ethylene/vinyl acetate copolymers, relates to a composition of the halogen-free flame-retardant ethylene/vinyl acetate copolymer of a phosphorus-containing heterocyclic compound, and in particular relates to a composition of the halogen-free flame-retardant ethylene/vinyl acetate copolymer, and the composition is prevented from being flamed under the synergistic action of a metal hydroxide and an organophosphorus heterocyclic compound. The composition contains the following components by weight percent: 30% to 50% of the ethylene/vinyl acetate copolymer, 40% to 60% of the metal hydroxide and 0.1% to 10% of the organophosphorus heterocyclic compound. The composition is prepared conveniently, which is beneficial to the industrial production. The composition has the excellent flame-retardant property and also has the mechanical property and heat stability of materials. In addition, the composition is good in rheological property and can be processed simply. As a result, the composition provided by the invention can be applied to the fields of electric wires and cables, and the like.

Description

technical field [0001] The invention belongs to the field of halogen-free flame-retardant ethylene-vinyl acetate copolymers, in particular to a composition of ethylene-vinyl acetate copolymers in which metal hydroxides and organophosphorous heterocyclic compounds are synergistically flame-retardant. Background technique [0002] Ethylene-vinyl acetate copolymer (EVA) is a polymer material formed by copolymerization of ethylene and vinyl acetate in a certain proportion. Generally, the content of vinyl acetate is 5wt% to 40wt%. Compared with polyethylene, due to the introduction of polar vinyl acetate monomer in the molecular chain of ethylene-vinyl acetate copolymer, the high crystallinity is reduced, and the flexibility, impact resistance, filler compatibility and heat resistance are improved. Sealing performance, is widely used in foamed shoe materials, functional shed film, packaging film, hot melt adhesive, wire and cable and toys and other fields. [0003] With the incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L31/04C08L23/06C08K5/5357C08K3/22H01B7/295
Inventor 阳明书董会丛张世民丁艳芬王峰刘绍仁董全霄
Owner INST OF CHEM CHINESE ACAD OF SCI
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