Preparation of oil-extended montmorillonite-extended latex coprecipitation rubber

Abstract

The invention relates to a preparation method for oil-filled montmorillonite-filled emulsion coprecipitated rubber. The rubber comprises the following main components in portion by weight: 100 portions of rubber, 1 to 80 portions of montmorillonite, 1 to 80 portions of oil, 0.1 to 5 portions of coupling agent and 0.1 to 5 portions of age resistor. The preparation method comprises the following steps: adding organic modified montmorillonite or unmodified montmorillonite suspension, coupling agent and age resistor in rubber emulsion and stirring for 1 to 30 minutes while keeping the temperature at 30 to 80 DEG C; adding emulsible oil in the mixture and stirring 1 to 30 minutes; then, respectively synchronously adding the mixture, flocculant and protonic acid, in the aqueous solution of inorganic salt and flocculating agent step by step and stirring for 1 to 30 minutes while keeping pH value between 3 and 4; adding inorganic alkali and adjusting the pH value to 7, and flocculating while stirring; dehydrating and drying the floccule to obtain the oil-filled montmorillonite-filled emulsion coprecipitated rubber. The coprecipitated rubber prepared by the method has excellent performance and ideal reinforcing effect, and can be filled with more montmorillonite while ensuring uniform dispersion, thereby substantially reducing production cost and pollution; moreover, the coprecipitated rubber has simple process and can meet the requirements of different users through adjusting the dosage ratio of filled oil and montmorillonite, thereby having great application value.

Description

Technical field: [0001] The invention relates to a method for preparing oil-filled montmorillonite emulsion co-precipitation rubber, which belongs to the technical field of polymer materials. Background technique: [0002] Rubber is an important strategic material. Because of its special high elasticity, it is used in various fields of the national economy. But the biggest disadvantage of rubber is its low strength, and it must be added with a reinforcing agent to have practical value. For a long time, people have been using carbon black and white carbon black as reinforcing agents. However, in addition to serious pollution, the source of carbon black also depends on petroleum energy materials, and the price is expensive, while the reinforcing effect of white carbon black is not ideal, and the price more expensive. Finding a rubber reinforcing agent with little pollution (or no pollution), low price and easy processing has always been a major issue that people are committe...

AI Technical Summary

Problems solved by technology

The above methods all directly co-precipitate rubber emulsion and montmorillonite. Due to the poor wettability of rubber macromolecular chains and montmorillonite, it is difficult for montmorillonite to be effectively coated in rubber during co-precipitation, especially when montmorillonite is filled. When the amount is large (more than 5 parts by weight), a large amount of montmorillonite remains in the co-sedimentation liquid, which is difficult to realize suitability for industrialized production