Organic composite porous layer inorganic salt (montmorillonite) (rod)

Catalog	ACMA00023498
Description	This product is a kind of soil-like mineral composed of nanometer-thick silicate sheets with negatively charged surface, which are stacked together by electrostatic interaction between the layers. The unit cell in its crystal structure is composed of two layers of silicon-oxygen tetrahedron. It consists of a layer of aluminum-oxygen octahedron sandwiched in the middle. It has a unique one-dimensional layered nanostructure and cation exchange properties, which endow montmorillonite with many possibilities for modification and expansion of application fields.
Appearance	Multidimensional crystal, pure white powder with slippery feeling.
Application	Montmorillonite modified in different ways has strong adsorption capacity and good dispersion performance, and can be widely used in the polymer material industry as an additive for nano-polymer polymer materials to improve impact resistance, fatigue resistance, dimensional stability and Gas barrier properties, etc., so as to enhance the comprehensive physical properties of the polymer, while improving the material processing properties.
Feature	Good whiteness, good color fixing effect, synergistic flame retardant, smoke suppression, deodorization, over-glow wire. It has obvious and enhanced effect on red phosphorus flame retardant, smoke suppression and deodorization.
Notes	Synergistic flame retardant, especially suitable for red phosphorus synergistic flame retardant and deodorization

Case Study

Synergistic Effect of Organic Modified Montmorillonite on Intumescent Fire Retardant Coatings

Yan, Long, et al. Progress in Organic Coatings, 2018, 122, 107-118.

Organic modified montmorillonite (OMMT) was obtained by modifying layered montmorillonite (MMT) with alkyl ammonium salts. Subsequently, a series of new montmorillonite polyphosphate (OPEA) flame retardants were successfully synthesized by chemical grafting with cyclic phosphate acid (PEA) and different contents of organic modified montmorillonite (OMMT). These OPEAs were fully mixed with amino resins to prepare a series of transparent fire retardant coatings. Studies have shown that the introduction of OMMT significantly reduces the heat release and smoke production of the coating, making the carbon layer denser and having better fire retardant expansion.
Preparation of transparent fire-retardant coatings with OMMT
· PA (92.24 g, 0.8 mol) and n-BA (5.93 g, 0.08 mol) were added to a 500 mL three-necked flask. PER (29.95 g, 0.22 mol) was added portion-wise, and the mixture was refluxed at 105°C for 4 hours under magnetic stirring. A light yellow, transparent liquid, designated as PEA, was obtained.
· The prepared PEA was reacted with varying amounts of OMMT at 120°C for 6 hours, and water was removed by reduced pressure distillation. A series of yellowish, viscous liquids, termed OPEAs, were produced.
· A series of transparent intumescent fire-retardant coatings were prepared by thoroughly mixing 50 g of a PEA or OPEA ethanol solution (60 wt%) with 60 g of an MF n-BA solution (58-62 wt%). These coatings were applied to plywood boards of various sizes with a wet coating density of 500 g/m2 and cured to a 0.4 ± 0.02 mm thick transparent film at room temperature.

Synergistic Flame Retardancy of Montmorillonite/Phosphaphenanthrene Compounds in Epoxy Thermosets

Tang, Shuo, et al. RSC advances, 2017, 7(2), 720-728.

Organically modified montmorillonite (OMMT) was combined with a flame retardant containing phosphaphenanthrene and triazinetrione groups (TAD) to enhance the flame retardancy of epoxy thermosets (EP). When only 1 wt% OMMT/4 wt% TAD was introduced into EP, the limiting oxygen index (LOI) increased from 26% to 36.9% and achieved a V-0 rating in the UL 94 test.
Preparation and flame retardancy mechanism of the OMMT/TAD system
· DGEBA, TAD, and OMMT were heated to 135 °C and stirred for 30 minutes at 100 °C. Subsequently, DDM was incorporated into the mixture at 120 °C and mixed thoroughly. After degassing the mixture for 3 minutes at 120 °C, it was poured into preheated molds and cured first for 2 hours at 120 °C, followed by 4 hours at 170 °C, resulting in a formulation of 4% TAD/1% OMMT/EP.
· Mechanism: The initial flame-promoting effect facilitated the rapid formation of residue, characterized by condensed aggregates of MMT, which created a barrier effect on the surface of the residue. TAD released decomposed products that provided a quenching effect from the phosphenanthrene group and a dilution effect from the triazine-trione group, both of which exhibit strong flame-retarding properties and fuel dilution effects in the gas phase. When OMMT and TAD were used together to enhance the flame resistance of epoxy thermosets, improved flame retardancy was achieved through the barrier effect of MMT in the condensed phase and the flame-inhibiting effect of TAD in the gas phase.

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