Preparation method of high-performance hydrotalcite/silicon dioxide/rubber nano composite material

Abstract

The invention relates to a preparation method of a high-performance hydrotalcite / silicon dioxide / rubber nano composite material. The stability of a rubber latex system is dependent on the zeta potential value of the system and hydrotalcite is filled to easily destroy the stability of the rubber. The preparation method comprises the following steps: by adopting an emulsion grafting method, firstly adhering silicon dioxide on a hydrotalcite laminate in an emulsion system by using a silane coupling agent to reduce the zeta potential value of the filler system; and furthermore, adjusting according to increase of the use level of SiO2 with electronegativity and obtaining a hydrotalcite / silicon dioxide / rubber emulsion composite system with high concentration so as to prepare the highly filled hydrotalcite / rubber composite material. The material is endowed with preferable air impermeability due to the laminate effect of hydrotalcite. SiO2 is adhered on the hydrotalcite laminate by means of chemical reaction of the silane coupling agent, so that the organic compatibility is improved, and the material is endowed with good crack propagation resistance and mechanical property. The material is expected to be importantly applied in the field of a tire inner liner material, space flight and aviation seal, medical seal and the like.

Description

Technical field: [0001] The invention relates to a preparation method of a high-performance hydrotalcite / silicon dioxide / rubber nano composite material. In particular, it solves the problem that the zeta potential value on the surface of hydrotalcite is positive, and the rubber emulsion filled to negative charge tends to cause early flocculation of the glue, and cannot obtain uniform dispersion and high filling. Use the negatively charged water-soluble suspension containing inorganic particles (such as silicon dioxide, etc.) as the charge balance agent of the hydrotalcite solution, and use the silane coupling agent (such as Si69, KH550, Si747, etc.) to bridge the hydrotalcite and the inorganic particles, thereby A high-performance hydrotalcite / silica / rubber nanocomposite was prepared. Background technique: [0002] Hydrotalcite is a layered double metal hydroxide (Layered Double Hydroxide Compounds, referred to as LDHs), is a kind of double hydroxyl anion clay that has deve...

AI Technical Summary

Problems solved by technology

When a small amount of hydrotalcite is added to the rubber emulsion, the positive charge on the surface of the hydrotalcite will neutralize the negative charge on the surface of the latex, instantly destroying the stability of the latex. Therefore, it is impossible to add a higher amount of hydrotalcite, and the excellent properties of hydrotalcite cannot be exerted. Exercising functions such as barrier gas

In addition, hydrotalcite is a polar filler and has poor compatibility with the rubber organic matrix, so it cannot fully demonstrate the excellent properties of hydrotalcite sheet materials, which greatly limits the application of hydrotalcite in rubber materials.

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