Intercalated layered double hydroxide smoke inhibitor and preparation method thereof

A technology of smoke suppressant and hydrotalcite, which is applied in the field of intercalated hydrotalcite smoke suppressant and its preparation, can solve the problems of general smoke suppression performance and lower surface temperature, and achieve remarkable smoke suppression effect, reduced smoke generation, large effect on the surface

Inactive Publication Date: 2017-05-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventor in European patent 02100800 studied a kind of LDHs flame retardant material, LDHs has abundant CO between the layers 3 2- and structure H 2 O, flame retardant gas CO when heated 2 and H 2 The release of O plays the role of isolating oxygen and reducing the surface temperature of the material. At the same time, it can form a condensed phase on the surface to prevent the expansion of the burning surface. It has a good flame retardant effect, but the smoke suppression performance is general

Method used

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  • Intercalated layered double hydroxide smoke inhibitor and preparation method thereof
  • Intercalated layered double hydroxide smoke inhibitor and preparation method thereof
  • Intercalated layered double hydroxide smoke inhibitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Step: Mg(OH) with a total mass of 30kg and a molar ratio of 2:1:3 2 , Al(OH) 3 and H 2 MoO 4 They were added to 60kg of deionized water, and pretreated by a grinder to make Mg(OH) 2 , Al(OH) 3 and H 2 MoO 4 Slurry, take 10kg of this slurry and add it to the autoclave; be heated to a reaction temperature of 215°C, react for 6h under stirring conditions (350rpm), and the obtained product is dried at 70°C for 8 hours to obtain a molecular formula of Mg 4 Al 2 (OH) 12 MoO 4 ·4H 2 O-molybdate intercalated hydrotalcite smoke suppressant.

[0023] The crystal structure of the product was characterized by XRD-6000 X-ray powder diffractometer from Shimadzu Corporation of Japan. figure 1 is the XRD spectrum. It can be seen from the figure that Mg appears around 2θ=11.58°, 23.47°, 34.87° and 60.8° 2 Al-MoO 4 - The characteristic diffraction peaks of LDHs, and the peak shape is sharp and the baseline is low and flat, indicating that the product has a complete crystal ...

Embodiment 2

[0029] Mg(NO 3 ) 2 , Zn(NO 3 ) 2 and Al(NO 3 ) 3 According to the ratio of Mg / Zn / Al=3:1:2, a mixed salt solution was prepared, so that [Mg 2+]=1.2mol / L, NaOH and Na 2 SnO 3 Press n(Na 2 SnO 3 ) / n(Al 3+ )=2, n(NaOH) / [n(Mg 2+ )+n(Zn 2+ )+n(Al 3+ )] = 1.5 to prepare a mixed alkali solution, the mixed salt solution and the mixed alkali solution have the same volume, the two solutions are added to the rotating liquid film reactor at the same time, and the obtained slurry is stirred and heated to 80 ° C in a flask under a nitrogen protection environment. , the stannate intercalated hydrotalcite smoke suppressant is obtained by washing after 24h of reaction.

[0030] The grain size and morphology were observed with a supra55 scanning electron microscope from ZEISS, Germany. image 3 It is a SEM photo, it can be seen from the figure that the prepared product has a uniform structure and a uniform particle size.

[0031] Take 3 g of the stannate intercalated hydrotalcite ...

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Abstract

The invention discloses an intercalated layered double hydroxide smoke inhibitor and a preparation method thereof. The smoke inhibitor is a layered structural material formed by assembling a laminated sheet consisting of metal cations and interlayer anions, wherein a specific composition general formula of the smoke inhibitor is M<2+>1-xM<3+>x(OH)2(A<n->)n / 2.mH2O. According to the preparation method disclosed by the invention, the intercalated layered double hydroxide smoke inhibitor is prepared by adopting a one-step coprecipitation method or a clean hydrothermal reaction at one step; the preparation method is simple and practical; according to the obtained intercalated layered double hydroxide smoke inhibitor, smoke inhibiting groups such as molybdate anions, an octamolybdate radical, a cuprate radical and a stannate radical are arranged at an interlayer, and smoke inhibiting elements such as iron and copper are introduced into the laminated sheet, so that a good carbon forming effect is realized, the smoke generating amount can be reduced, and the smoke inhibiting effect is synergically enhanced; meanwhile, a layered double hydroxide laminated sheet forms an alkaline porous substance at high temperature; the alkaline porous substance has greater specific surface area and can effectively adsorb smog; the prepared intercalated layered double hydroxide smoke inhibitor is applied to an ordinary rubber-plastic product and a high-temperature rubber-plastic product; the maximum density (Ds, max) at low additive amount (1phr) can be reduced by 87.3 percent; the intercalated layered double hydroxide smoke inhibitor is remarkable in smoke inhibiting effect and is a smoke inhibitor material with excellent performance.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of preparation of smoke suppressing materials, in particular to an intercalated hydrotalcite smoke suppressant and a preparation method thereof. The smoke suppressant material can significantly reduce the smoke density of rubber and plastic products when burning. [0003] Background technique: [0004] Rubber and plastic products play an important role in people's lives, and their products are used in all aspects of people's lives, providing an important guarantee for human production and life. Rubber and plastic products have excellent performance, but most products are easy to burn, which brings great harm to people's lives and property safety in the event of a fire accident. At present, flame retardants are added to most rubber and plastic products to improve the flame retardant performance, but most of the flame retardants have poor smoke suppression performance and even some flame retardants will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K7/00C08K3/22C08L23/08C08L27/06C01F7/00
CPCC08K3/22C08K7/00C01P2004/03C01P2002/80C01P2002/72C01F7/785C08L23/0853C08L27/06
Inventor 林彦军李凯涛段雪
Owner BEIJING UNIV OF CHEM TECH
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