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Polymer/organic montmorillonite nano composite flame-proof masterbatch, its preparing method and application

An organic montmorillonite and nanocomposite technology, which is applied in the field of polymer/organic montmorillonite nanocomposite flame retardant masterbatch and its preparation, can solve the problems of unfavorable large-scale industrial production, flying dust, affecting flame retardant performance, etc., to achieve Good application and promotion prospects, simple processing technology, and the effect of reducing adverse effects

Inactive Publication Date: 2007-09-12
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

The melt intercalation method refers to the method in which the polymer is directly intercalated between the montmorillonite sheets under the action of an external force in a molten state. This method has a simple process and is easy to industrialize; Due to the problem of non-resistance, the montmorillonite sheet layer in the composite material prepared by the melt intercalation method is difficult to achieve true nanoscale dispersion, which affects the flame retardancy on the one hand, and on the other hand, due to the phase between the polymer and the montmorillonite Poor capacity may affect the mechanical properties of some polymers, especially polymers with special aggregate structures such as ABS; in addition, the dispersion state of montmorillonite sheets in this method is greatly affected by processing conditions , the processing process is not easy to control, and because montmorillonite is directly added in the form of powder, it is easy to cause dust to fly, which is not conducive to large-scale industrial production
The in-situ intercalation method is to make the polymer / montmorillonite nanocomposite material by directly initiating monomer polymerization between the layers through the initiator entering the montmorillonite layer. The in-situ intercalation method can ensure that the montmorillonite layer is Nanoscale dispersion is achieved in the polymer matrix, and the use of a small amount of montmorillonite (<5%, mass fraction) can greatly improve the performance indicators of the polymer. The disadvantage is that the polymer monomer suitable for this method fewer types
The solution intercalation method pollutes the environment due to the use of solvents. In addition, if the polymer is directly used for solution intercalation, it is difficult to find a suitable solvent for some polymers, which limits the use of this method.

Method used

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  • Polymer/organic montmorillonite nano composite flame-proof masterbatch, its preparing method and application
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  • Polymer/organic montmorillonite nano composite flame-proof masterbatch, its preparing method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Preparation of Example 1 PBA / OMMT Nanocomposite Flame Retardant Masterbatch

[0040] Add 600 milliliters (ml) of water, 6.0 grams (g) of sodium lauryl sulfate, 2.0 g of ammonium persulfate and 90 g of organic montmorillonite (OMMT) modified by octadecyltrimethylammonium chloride into three ports In the flask, stir in a water bath at 35°C for 5 hours, then raise the temperature of the water bath to 80°C, add 90 g of butyl acrylate to the three-necked flask under stirring, and polymerize at 80°C for 6 hours, and the reaction product Pour into a beaker, add an appropriate amount of distilled water, stir evenly, let stand until the reactants are separated, discard the upper layer of clear water, filter the lower layer under reduced pressure, and vacuum-dry the obtained solid matter at 60°C to constant weight to obtain the content of OMMT About 50% polybutylacrylate / organic montmorillonite (PBA / OMMT) nanocomposite flame retardant masterbatch, denoted as PBA / OMMT-50.

[0041...

Embodiment 2

[0049] The preparation method and reaction conditions of the PBA / OMMT nanocomposite flame retardant masterbatch of the present invention are as embodiment 1, the OMMT consumption is reduced to 60g, namely the PBA / OMMT nanocomposite flameretardant masterbatch that makes OMMT content is about 40%, Denoted as PBA / OMMT-40. It can be seen from Figure 1(d) that the layer spacing of montmorillonite is 3.85nm, which is close to that of PBA / OMMT-50.

[0050] Fig. 2(c) is the XRD spectrum of flame retardant ABS with OMMT content of 3% prepared by PBA / OMMT-40 masterbatch dispersion method. The results are similar to those in Figure 2(b), indicating that the montmorillonite sheets were exfoliated in ABS and dispersed uniformly at the nanoscale, forming an exfoliated ABS / OMMT nanocomposite.

[0051] It can be seen from Figure 3(d) that the PHHR and mHRR of flame-retardant ABS prepared from PBA / OMMT-40 masterbatch with 3% OMMT content are 825.2kW.m -2 and 358.8Kw.m -2 , respectively decr...

Embodiment 3

[0053] According to the method and conditions of Example 1, PBA / OMMT-40 nanocomposite flame retardant masterbatch was used to prepare flame retardant ABS. Flame-retardant ABS with 5% and 7% OMMT contents were prepared by changing the amount of PBA / OMMT-40.

[0054] It can be seen from Figures 3(d), 3(e), and 3(f) that as the OMMT content increases from 3% to 5% and 7%, the HRR curve of flame-retardant ABS gradually becomes gentle, and the PHHR changes from 825.2 kW.m -2 Respectively decreased to 709.5kW.m -2 and 710.8kW.m -2 , indicating that the increase of OMMT content is beneficial to improve the flame retardant effect, but when its content increases to 5%, PHRR no longer decreases. In addition, when the amount of OMMT increased from 3% to 5% and 7%, the tensile strength of the obtained flame-retardant ABS decreased from 44.7MPa to 39.5MPa and 36.9MPa, respectively, and the impact strength decreased from 8.0kJ.m -2 Respectively down to 7.8kJ.m -2 and 5.7kJ.m -2 , indi...

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Abstract

This invention relates to a polymer / organic montmorillonite nano-composite fire retardant material, its preparation and application, which takes water as the media, and under the condition of emulsifier, acrylic monomers or styrene monomers that enter organic montmorillonite layers through initiator conduct polymerization, obtaining the polymer / organic montmorillonite nano-composite fire retardant material. It can prepare flame-retardant plastic with good retardant and mechanical properties if this material is melt with acrylonitrile-butadiene-(ABS), HIPS or PP together.

Description

technical field [0001] The invention relates to the field of organic / inorganic nanocomposite materials, in particular to a polymer / organic montmorillonite nanocomposite flame retardant masterbatch and its preparation method and application. Background technique [0002] In recent years, with the enhancement of people's awareness of environmental protection and the introduction of more stringent environmental regulations related to flame retardant materials, the use of some traditional halogen-containing flame retardant systems in the field of flame retardant polymer materials has received more and more attention. There are many restrictions, because the polymer materials containing this kind of flame retardant system will produce a large amount of toxic smoke and corrosive gases when burned, causing secondary pollution. Polymer / layered silicate nanocomposites, which emerged in the late 1980s, opened up a new way of flame-retardant polymer material...

Claims

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Application Information

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IPC IPC(8): C08F2/44C08F20/10C08F12/08C08F2/22C08F4/30C08K9/04C08L55/02C08L23/12C08L25/06
Inventor 曾幸荣贺成张远江
Owner SOUTH CHINA UNIV OF TECH
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