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Method for preparing Nano composite material of nylon / clay of laminar silicate

A nanocomposite material and layered silicate technology, which is applied in the field of nanocomposite material preparation, can solve the problems of inability to obtain completely exfoliated nanocomposite materials, and achieve the effect of obvious barrier effect, uniform distribution and improved barrier performance.

Inactive Publication Date: 2009-08-26
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only prepare nanocomposites with low clay content, and nylon molecules are only intercalated between clay sheets, so it is impossible to obtain completely exfoliated nanocomposites

Method used

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  • Method for preparing Nano composite material of nylon / clay of laminar silicate
  • Method for preparing Nano composite material of nylon / clay of laminar silicate
  • Method for preparing Nano composite material of nylon / clay of laminar silicate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Dissolve 10 parts by weight of masterbatch of nylon 6 / montmorillonite nanocomposite with 10% montmorillonite content in 90 parts by weight of caprolactam monomer under heating, and dehydrate under vacuum for 20 minutes. Add 0.4% of the monomer weight of sodium hydroxide (NaOH), continue vacuum dehydration for 20 minutes, then add 0.6% of the monomer weight of toluene diisocyanate (TDI) to shake up, and quickly pour it into a mold preheated to 160 ° C. Polymerization is carried out in an oven at 160°C to obtain a cast nylon 6 / montmorillonite nanocomposite material. In the nanocomposite material, the mass content of montmorillonite is about 1%. The XRD pattern of the obtained nanocomposite is shown in figure 1, we can see from the figure that there is no diffraction peak in the range of 2θ angle of 1 to 10 degrees, indicating that the montmorillonite sheet is completely peeled off. The properties of nylon 6 modified by montmorillonite are shown in Table 1.

Embodiment 2

[0038] Dissolve 10 parts by weight of montmorillonite content of 10% nylon 1212 / clay nanocomposite masterbatch in 90 parts by weight of caprolactam, dehydrate under vacuum for 20 minutes, then add 1% sodium caprolactam, continue to remove water under vacuum After 10 minutes, add 0.8% by weight of toluene diisocyanate, shake well, quickly pour it into a mold preheated to 180°C, polymerize in an oven at 180°C for 30 minutes, cool and demould, and you can get nylon 1212 mass content The cast nylon / montmorillonite nanocomposite material is 10% and the mass content of montmorillonite is 1%. The properties of nylon 6 modified by nylon 1212 and montmorillonite are shown in Table 1.

Embodiment 3

[0040] 8 parts of heavy montmorillonite content is that 20% nylon 66 / clay nanocomposite master batch is dissolved in 92 parts of heavy caprolactam, dehydrated under vacuum for 20 minutes, then added 0.4% potassium hydroxide, continued to remove under vacuum Water for 10 minutes, add 0.6% by weight of toluene diisocyanate, shake well, quickly pour into a mold preheated to 170°C, polymerize in an oven at 170°C for 30 minutes, cool and demould, you can get nylon 66 mass content The cast nylon / montmorillonite nanocomposite material is 8% and the mass content of montmorillonite is 1.6%. The properties of nylon 6 modified by nylon 66 and montmorillonite are shown in Table 1.

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PUM

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Abstract

The present invention relates to a kind of preparation method of nylon / layered silicate clay nanocomposite material, the method comprises the following process steps: first dissolving the master batch of nylon / layered silicate clay nanocomposite material in molten lactam monomer In the process, the moisture in the lactam is removed under vacuum, then the catalyst is added, the water is removed in vacuum, and the co-catalyst is added for mixing to obtain a premix, and finally the premix is ​​poured into a mold preheated to a certain temperature, and the Anionic ring-opening polymerization at high temperature, or adding the premixed material to the feed port of the twin-screw extruder, and performing twin-screw reactive extrusion to prepare the nylon / layered silicate clay nanocomposite material. By adopting the method of the invention, the nylon nanocomposite material in which the clay sheet is completely peeled off can be obtained, and the composite material can improve the stability of the product in use and increase the thermal deformation temperature of the material.

Description

technical field [0001] The invention relates to a preparation method of a nanocomposite material, in particular to a method for preparing a nylon / layered silicate clay nanocomposite material through anion polymerization. Background technique [0002] Nylon has excellent mechanical and physical properties and good heat resistance, and has been widely used as engineering plastics. Anionic ring-opening polymerized nylon has been widely used because of its fast polymerization speed and high molecular weight, compared with the corresponding melt polycondensed nylon, which has higher mechanical properties. However, due to the strong polarity of nylon, the water absorption rate of the material is high, and the application of the material is damaged to a certain extent. In order to improve various properties of anionic ring-opening polymerized nylon, some inorganic fillers such as carbon black, calcium carbonate, etc. are often added to the molten monomer, and then the modified cas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/02C08K3/34C08G69/48
Inventor 解廷秀杨桂生
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD