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Method of nano-modifying flame-retardant ethylene-vinyl acetate copolymer via two-dimensional material

A vinyl acetate, two-dimensional material technology, applied in the field of flame retardant materials, can solve the problems of poor flame retardant effect, uneven dispersion of two-dimensional materials, etc., to improve the flame retardant efficiency, enhance the synergistic effect, and improve the flame retardant performance. Effect

Inactive Publication Date: 2019-05-10
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor flame-retardant effect caused by uneven dispersion of two-dimensional materials in the prior art, and to provide a method for nano-modified flame-retardant ethylene-vinyl acetate copolymer of two-dimensional materials

Method used

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  • Method of nano-modifying flame-retardant ethylene-vinyl acetate copolymer via two-dimensional material
  • Method of nano-modifying flame-retardant ethylene-vinyl acetate copolymer via two-dimensional material
  • Method of nano-modifying flame-retardant ethylene-vinyl acetate copolymer via two-dimensional material

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Effect test

Embodiment 1

[0047] A method for nano-modified flame-retardant ethylene-vinyl acetate copolymer of a two-dimensional material, each component and its mass percentage content are shown in the following table: (based on the total mass percentage as 100%)

[0048]

[0049]

[0050] Specific steps are as follows:

[0051] (1) After aluminum hydroxide and montmorillonite are dried in an oven at 80°C, they are mixed at a ratio of 10:1 and put into a zirconia ball milling jar, and then zirconia ball milling beads are put into the ball milling jar, and the powder and ball milling beads Total mass is 800g, setting ball mill rotating speed 800rpm, ball milling 2h, obtains a kind of nanocomposite fire retardant that montmorillonite is exfoliated and dispersed in aluminum hydroxide, and its transmission electron microscope is as follows: Figure 6 As shown in the figure, it can be seen that the montmorillonite is delaminated and peeled off, and it is evenly mixed with the aluminum hydroxide part...

Embodiment 2

[0056] Taking the total mass of the composite material as 100%, the components and mass percentages are as follows:

[0057]

[0058]

[0059] Specific steps are as follows:

[0060] (1) After drying melamine cyanurate and montmorillonite in an oven at 80°C, mix them at a ratio of 4:1 and put them into a zirconia ball milling jar, then put the zirconia ball milling beads into the ball milling jar, the powder and The total mass of ball milling beads is 300g, the ball mill speed is set at 800rpm, and ball milling is carried out for 3h to obtain a nanocomposite flame retardant that is exfoliated from montmorillonite and dispersed in melamine cyanurate. Its transmission electron microscope is as follows: Figure 7 As shown in the figure, it can be seen that the montmorillonite is delaminated and peeled off, and it is evenly mixed with the aluminum hydroxide particles.

[0061] (2) The ethylene-vinyl acetate copolymer, compatibilizer, montmorillonite exfoliated and dispersed...

Embodiment 3

[0065] Taking the total mass of the composite material as 100%, the components and mass percentages are as follows:

[0066]

[0067]

[0068] Specific steps are as follows:

[0069] (1) After drying hydromagnesite and hydrotalcite in an oven at 80°C, mix them at a ratio of 11:1 and put them into a zirconia ball milling jar, then put zirconia ball milling beads into the ball milling jar, the powder and ball milling beads The total mass is 800g, the rotational speed of the ball mill is set at 800rpm, and the ball mill is milled for 1 hour to obtain a nanocomposite flame retardant in which hydrotalcite is exfoliated and dispersed in hydromagnesite.

[0070] (2) The ethylene-vinyl acetate copolymer, compatibilizer, and hydrotalcite are exfoliated and dispersed in hydromagnesite. The nanocomposite flame retardant and processing aid are first dried in an oven at 80°C, and then they are Put it in a high mixer and mix evenly, send the mixed raw materials into the feeder of the...

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Abstract

The invention relates to a method of nano-modifying flame-retardant ethylene-vinyl acetate copolymer via a two-dimensional material and belongs to the technical field of flame-retardant materials. Themethod includes: preparing a two-dimensional material in advance by a ball milling process and stripping a dispersed composite nano flame retardant from an inorganic flame retardant; compounding thecomposite nano flame retardant, the inorganic flame retardant and a compatibilizer, applying the compound to an ethylene-vinyl acetate copolymer so that the two-dimensional material is well dispersedin the ethylene-vinyl acetate copolymer; synergy with the inorganic flame retardant is enhanced, flame retarding efficiency is evidently improved, flame retardance of the ethylene-vinyl acetate copolymer can be evidently improved, and the problem of poor dispersion uniformity due to the direct addition of the two-dimensional material is solved.

Description

technical field [0001] The invention relates to a method for nano-modifying flame-retardant ethylene-vinyl acetate copolymer with a two-dimensional material, and belongs to the technical field of flame-retardant materials. Background technique [0002] Ethylene-vinyl acetate copolymer (EVA) is produced by copolymerization of ethylene and vinyl acetate, and vinyl acetate is introduced into the molecular structure to achieve the purpose of reducing crystallinity. EVA is widely used in hot melt adhesives, packaging and wire and cable fields due to its good processing performance, mechanical properties and weather resistance; however, the flammability of EVA limits its application. At present, there are not only requirements for flame retardancy of EVA, but also higher and higher requirements for its safety and environmental protection. Therefore, the halogen-free flame retardancy of EVA is becoming more and more important. At this stage, the flame retardant of EVA is mainly b...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L51/06C08L83/04C08L23/06C08K13/06C08K9/00C08K5/3492C08K3/34C08K3/22C08K3/26
Inventor 李定华吴凡杨荣杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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