Method for increasing particle size of lignin/butadiene styrene rubber composite particles

Abstract

The invention relates to a method for increasing the particle size of lignin / styrene-butadiene rubber composite particles, which comprises the following steps: (1) dissolving lignin in alkali liquor, then adjusting the pH value to 6-9 by using a dilute acid solution, and then adding styrene-butadiene rubber latex for reaction to obtain lignin / styrene-butadiene rubber latex mixed liquor; and (2) adding the mixed solution in the step (1) and an inorganic acid solution into water to react, separating out solid composite particles, filtering, washing and drying to obtain the composite particles. According to the invention, coating of lignin molecules on styrene butadiene rubber particles can be effectively reduced, the particle size of the composite particles is further improved, the particle size of particles greater than 10 meshes accounts for 85% or more, and the problem that the particle size of colloidal particles is too small during liquid-phase co-precipitation is solved.

Description

technical field [0001] The invention belongs to the field of rubber composite materials, and in particular relates to a method for increasing the particle size of lignin / styrene-butadiene rubber composite particles. Background technique [0002] Styrene-butadiene rubber (SBR) is a random copolymer of butadiene and styrene. It is the largest variety of synthetic rubber, the backbone product of the rubber industry, and one of the earliest rubbers to achieve industrial production. Lignin is a natural organic polymer with an aromatic ring structure, second only to cellulose in nature, lignin is degradable, non-toxic, renewable, low density, and contains more lignin and its derivatives Active groups (aryl groups, alcoholic hydroxyl groups, carboxyl groups, methoxy groups, conjugated double bonds, etc.) can improve the mechanical properties of rubber such as tensile strength, modulus stress and wear resistance by adding lignin to styrene-butadiene rubber. Improve the anti-ultrav...

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Problems solved by technology

However, when this patent is carrying out liquid phase co-precipitation of lignin / styrene-butadiene rubber composite materials, since the coating of rubber particles by lignin molecules will block the normal cross-linking between rubber particles, the particle size of the composite material particles will often appear If it is too small, in industrial production, glue leakage (the rubber particles fall from the gap of the chain belt) and flying glue (the rubber particles are blown up by the drying air flow) will occur during the subsequent belt drying oven drying, resulting in equipment failure and rubber loss

Therefore, how to solve the problem of colloidal particles being too small in the process of liquid phase co-precipitation of lignin / styrene-butadiene rubber composites while improving dispersibility has not yet been reported.

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