Surface modification method of aramid, and reinforced natural rubber material and preparation method thereof

Abstract

The invention discloses a surface modification method of aramid, a reinforced natural rubber material and a preparation method thereof. The surface modification method of aramid comprises the following steps of: dipping aramid fibre for 0.5-3h by using phosphoric acid solution at 20-50 DEG C, after cleaning and drying, dipping aramid fibre for 1-2h by using acetone solution of epoxy resin with the mass percentage concentration of 5-20% at normal temperature, and then modifying the surface of aramid after drying. According to the invention, active groups of surface modified aramid and terminated hydroxyl of epoxy resin and liquid rubber are chemically reacted simultaneously at mixing temperature, so that the interfacial bonding strength is improved; liquid rubber and matrix rubber are vulcanized together in the subsequent vulcanizing process of mixing rubber, so that a cross-linked network tightly combined with aramid fibre is formed; the problem that the matrix rubber in an original physical manner forms a self cross-linked network while being vulcanized is overcome, and therefore, negative phenomena of a rubber and aramid fibre interface can be reduced; and the aramid reinforced rubber composite material having good interfacial bonding and fibre dispersion can be formed.

Description

technical field [0001] The invention relates to the field of polymer science, in particular to a method for surface modification of aramid fibers, a product thereof and a preparation method of the product. Background technique [0002] High stiffness and high strength aramid fiber (AF) is an ideal rubber reinforcement material, but the surface of aramid fiber is very smooth, with few active functional groups, low reactivity, and great inertness, especially its high crystallinity, which makes it The interface adhesion with rubber material is poor, and the fiber dispersion is poor, which seriously affects the improvement of the performance of the composite material. Therefore, the surface activation treatment of aramid fiber and its uniform dispersion in the matrix material are the key to the preparation of aramid fiber reinforced rubber composite with excellent performance. Key technologies of materials. At present, the surface treatment of aramid fibers of aramid fiber / rubb...

AI Technical Summary

Problems solved by technology

The dispersion of fibers is another technical problem in the industry. Excessive kneading in order to make the fibers dispersed uniformly will lead to excessive reduction in fiber length, decrease in rubber molecular weight, and deterioration of performance; if the fiber length is long but the dispersion is uneven Composite materials with less than excellent performance

Images