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[Chemical Knowledge]：Production process and preparation method of nitrile latex

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Nitrile latex is a synthetic material widely used in medical, laboratory, paint, construction and chemical industries. In industrial production and practical application, nitrile latex has the characteristics of oil resistance, acid resistance, alkali resistance, chemical resistance and heat resistance, and can replace natural rubber latex and synthetic rubber latex in some application scenarios. This article will introduce the production process and preparation method of nitrile latex.

1. nitrile latex production process

1. Preparation of nitrile emulsion
nitrile emulsion is the precursor of the preparation of nitrile latex, so the preparation of high-quality nitrile emulsion is the key to the preparation of high-performance nitrile latex. The preparation of nitrile emulsion usually adopts emulsion polymerization method, the nitrile monomer, crosslinking agent, starting agent, emulsifier and auxiliary agent are dissolved in the water phase, and then the polymerization initiator is added to carry out emulsion polymerization reaction, and finally the nitrile emulsion is obtained.

2. Preparation
of nitrile latex The nitrile emulsion can be prepared into nitrile latex after filtration, centrifugation, purification, dilution and other treatments. The nitrile latex is usually prepared by the dry gel method, that is, the nitrile latex is added with calcium carbonate and other solid substances under the condition of high-speed stirring to form a dry gel, and then a diluent is added for mechanical dispersion and filtration to obtain the nitrile latex treated by heating, dehydration, drying and other processes.

3. Post-treatment of nitrile latex
After the production of nitrile latex, post-treatment is required to change its performance and use. For example, chemicals such as anti-aging agent and vulcanizing agent can be added to modify nitrile latex to improve its heat resistance and tensile strength.

2. nitrile latex preparation method

1. Traditional preparation method
In the traditional nitrile latex preparation method, the nitrile monomer is polymerized into emulsion by emulsion polymerization, and then the emulsion is prepared into nitrile active gum. Commonly used emulsifiers are anionic-nonionic composite emulsifiers such as sodium dodecylbenzenesulfonate.

2. Directional preparation method
Based on the traditional preparation method, the directional preparation method realizes the directional control of the morphology and performance of the nitrile latex by adjusting the monomer/emulsifier ratio, controlling the ionic strength and pH value. For example, the addition of a cationic inorganic salt to the nitrile emulsion can promote the polymerization reaction to form a high quality nitrile latex.