Applications Rosin has many excellent properties, such as anti-corrosion, moisture-proof, insulation, bonding, emulsification, softening, etc. The main ones are: 1. In the papermaking industry, rosin is saponified with caustic soda to make a sizing agent, which is then beaten into paper pulp with alumina sulfate to prevent the ink from penetrating the paper during writing and facilitate printing. 2. In the ink industry, it can be used as an ink carrier with good compatibility. 3. In the paint industry, rosin is made into calcium salts, sodium salts, etc. to make the paint bright and dry quickly, and increase the hardness and water resistance of the paint film. 4. In the soap industry, rosin is saponified with caustic soda to produce rosin soap, which has great detergency, is easily soluble in water, has good foaming properties, can dissolve grease, and is made into soap. 5. In the food industry, it is used as a food additive in the production of chewing gum and can also be used in the preparation of beverages. The depilatory composed of rosin and cottonseed oil can also be used in meat processing. 6. In the pharmaceutical and pesticide industries, rosin plays a role in softening, bonding, moisture-proofing, and anti-corrosion in medical adhesive plasters and insulating pastes. Rosin can be made into fungicides. It can also act as an emulsifier in insecticides to make insecticide emulsions. 7. In the electronic industry, in flux, rosin can remove the oxide film on the metal surface and help the flux to spread. 8. Other rosins can soften raw rubber, increase elasticity, increase viscosity, and improve its tear strength. It can be made into insulating oil and used as a cable protective film, and can also be used for battery sealing wax, etc. In printing and dyeing formulas, rosin plays a sticky adhesion role. Adding rosin to silk and waterproof cards can play a waterproof and heat-resistant role. The impregnating agent composed of rosin, wax, butylated hydroxytoluene, oleic acid, water, etc. can make permeable building materials hydrophobic. Rosin is used as a foaming agent in cement. It can be used in shipbuilding as a sealing material. Rosin can be used in metal polishing agent formulations and as a base material for metal cutting fluids. Rosin can also be used as detonators, grenade fuses, and match igniters in military production. As a natural raw material, rosin still has some disadvantages, such as easy oxidation, low softening point, easy crystallization, etc. In order to improve the use effect and expand the scope of application, it is necessary to modify the chemical properties of rosin. At the same time, the user department also puts forward higher requirements for rosin for its own development. Therefore, through chemical modification of rosin, various excellent properties are artificially given to it, and a series of deep-processed products are made.
