Preparation method of pre-dispersed clay-aramid pulp flocculation masterbatch

Abstract

The invention discloses a preparation method of pre-dispersed clay-aramid pulp flocculation, and belongs to the field of high-performance polymer materials. According to the preparation method disclosed by the invention, an aramid pulp micro-fiber fully stretches to form effective isolation by using the high adsorption performance of an efficient coupling agent modified clay suspension system on the aramid pulp micro-fiber under a high-speed stirring effect, and simultaneously, a hydrophilic adhesive is added to endow the aramid pulp and the subsequently added rubber latex with better compatibility and adhesiveness. After the rubber latex is added into the modified clay-aramid pulp suspension system, rubber latex particles uniformly envelops the surface of the aramid pulp micro-fiber under a stirring effect, is subjected to demulsification coprecipitation and then cleaned and dried to obtain the coprecipitated masterbatch containing 40% of para aramid pulp. According to the preparation method disclosed by the invention, no organic solvent harmful to environment is used, the para aramid pulp is uniformly dispersed in the prepared pre-dispersed masterbatch without tangle, the masterbatch shares higher compatibility and adhesion with a rubber substrate and can be directly applied to enhancing systems for different rubber substrates, and the preparation method is simple in process, and quite low in cost.

Description

technical field [0001] The invention belongs to the technical field of manufacturing high-performance polymer structural materials. It relates to a preparation method of pre-dispersed clay-aramid pulp flocculation masterbatch, specifically relates to a method for preparing high-content aramid pulp by using a coupling agent to modify the clay suspension system to absorb aramid pulp microfibers The method of meal flocculation masterbatch. Background technique [0002] Aramid pulp (Aramid pulp) is a short fiber product formed by the fibrillation of the surface of aramid fibers. It has excellent properties such as high modulus, high strength, high temperature resistance, wear resistance, chemical corrosion resistance, and dimensional stability. This makes it widely used in non-asbestos friction sealing materials, high-performance insulating materials, honeycomb paper for engineering and new reinforcing additive materials, etc. However, as a new high-tech fiber, the application...

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Problems solved by technology

[0003] However, the excellent physical and chemical properties of aramid pulp also lead to a key problem that restricts the large-scale application of aramid pulp in rubber products: due to the strong surface polarity of aramid pulp, large electrostatic tendency, ultra-fine fibers, and specific surface area Large, so that the ultrafine fibrils near the surface of the main fiber are easily entangled with each other and adsorbed on the main fiber, making it difficult to disperse in the rubber matrix

However, the dispersing solvent is an organic solvent, and it cannot ensure that the aramid pulp is fully dispersed

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