Double-coated microencapsulation expansion flame retardant natural rubber and preparation method thereof

Abstract

The invention discloses double-coated microencapsulation expansion flame retardant natural rubber and a preparation method thereof and relates to rubber and a preparation method thereof. The method comprises the following steps of: sequentially mixing a rubber matrix, stearic acid, zinc oxide, an accelerant, an anti-aging agent, carbon black, paraffin, double-coated microencapsulation ammonium polyphosphate / mesoporous molecular sieve MCM-41, pentaerythritol, ammonium polyphosphate and sulfur in an open mill, and performing microencapsulation on the ammonium polyphosphate and mesoporous molecular sieve MCM-41 by employing melamine resin-zinc borate double coating, so that the thermal stability of the rubber matrix is improved. The coating defect of the melamine resin layer can be filled through the outer zinc borate layer, so that the microencapsulation coating is complete. The outer zinc borate layer is a flame retardant and an inorganic matter, and the flame retardant property and the mechanical property are effectively improved. In addition, the mesoporous molecular sieve MCM-41 has the special catalysis and adsorption functions and is synergistic with the expansion type flame retardant, so that the flame retardant property and carbon layer stability of the composite material are further improved.

Description

technical field [0001] The invention relates to a rubber and a preparation method thereof, in particular to a double-coated microencapsulated expansion flame-retardant natural rubber and a preparation method thereof. Background technique [0002] Rubber products are widely used, but natural rubber and most synthetic rubbers are flammable or inflammable, which limits their application in materials requiring flame retardancy. For example, the sheathing of wires and cables, various rubber products used in the electrical industry, various rubber products used in automobiles and airplanes, and rubber sheets used in public places such as shopping malls and hospitals, the importance of flame retardant treatment for them is obvious. [0003] Intumescent flame retardant is a new type of additive flame retardant that can generate a uniform carbon foam layer on the surface when the polymer is heated, heat insulation, oxygen insulation, smoke suppression, and prevent molten droplets. I...

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Problems solved by technology

However, if it is directly applied to polymer materials, the performance of the material will be greatly reduced due to problems such as compatibility and water absorption between the two.

For example, our research group once applied for nano-mesoporous molecular sieve synergistically expanded flame-retardant rubber and its preparation method (application number: 201110120587.6). Adding nano-mesoporous molecular sieve as a synergist, although the flame-retardant efficiency has been improved to a certain extent, The amount of carbon residue is increased, but the intumescent flame retardant without coating treatment, especially the ammonium polyphosphate component has a large hygroscopicity and is easy to agglomerate, which is limited for further improving the flame retardancy and mechanical properties of the composite material. limit

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