Intercalation preparation method of nylon 6/quaternary phosphonium salt modified montmorillonite nano composite material

Abstract

The invention discloses an intercalation preparation method of a nylon 6 / quaternary phosphonium salt modified montmorillonite nano composite material. The method comprises the following steps: 1) adding quaternary phosphonium salt and sodium-based montmorillonite into water in a mass ratio of 1:(3-5), and stirring for 4-8 hours at the temperature of 60-100 DEG C; 2) filtering a solution obtained in the step 1) so as to obtain a solid, washing, drying, grinding, and sieving so as to obtain quaternary phosphonium salt intercalation modified montmorillonite; 3) evenly stirring the quaternary phosphonium salt intercalation modified montmorillonite obtained in the step 2) with caprolactam at room temperature, adding water and an auxiliary for carrying out hydrolysis polymerization reaction on caprolactam, and pelletizing after reaction so as to obtain a nylon 6 / montmorillonite nano composite material slice, wherein the mass ratio of quaternary phosphonium salt intercalation modified intercalation modified montmorillonite to caprolactam is 1: (18-22); and 4) extracting the slice obtained in the step 3) with water. The product obtained by the method in the invention has good mechanical property and color is not easily to change.

Description

technical field [0001] The invention relates to an intercalation preparation method of nylon 6 / quaternary phosphonium salt modified montmorillonite nano composite material. Background technique [0002] Intercalation composite method is an important method to prepare high-performance polymer-based nanocomposites, and it is also one of the current research hotspots in the field of materials science. It is to insert the monomer between the montmorillonite sheets for in-situ polymerization, or the polymer is directly inserted between the montmorillonite sheets, thereby destroying the sheet structure of the montmorillonite to form a polymer nanocomposite material. The composite of the polymer and the montmorillonite at the nanometer level greatly increases the interfacial interaction between the polymer and the montmorillonite, so that the composite material has excellent mechanical properties. [0003] Polymer / montmorillonite nanocomposites have the advantages of excellent com...

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Problems solved by technology

[0006]1. Commonly used intercalation modifiers are long-chain alkyl quaternary ammonium salts, but the thermal decomposition temperature of quaternary ammonium salts is low. When desoiling and engineering plastics are melt blended and intercalated, engineering plastics will be discolored due to the decomposition of quaternary ammonium salts, which restricts the application of organic montmorillonite in engineering plastics

[0007]2. The modification method of montmorillonite is that the organic small molecule intercalation agent enters the interlayer of montmorillonite through ion exchange, and the intercalation agent and montmorillonite sheet The bonding force between the layers is relatively weak. During the intercalation process of melt blending with nylon 6, a part of the intercalation agent between the layers will come out due to strong shearing, so that the polymer macromolecules cannot enter the montmorillonite layer to form a real nanostructured composites

Montmorillonite will re-aggregate into massive large particles, which is difficult to fully and effectively disperse uniformly, making the performance of nylon 6 / montmorillonite nanocomposites far lower than the theoretical expected value, and it is difficult to reflect the nano effect

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