With the rapid development of the synthetic materials industry, the demand for n-dodecyl mercaptan has rapidly increased. They can effectively reduce the branching of polymer chains, regulate molecular weight, and make molecular weight uniform; It can prevent excessive functional group cross-linking, make the cohesion of the polymer appropriate, and its dosage directly affects the molecular weight of the polymer, leading to the quality of the physical and mechanical properties of the polymer.

The purpose of adding n-dodecyl mercaptan during the polymerization process is to regulate the relative molecular weight, and the principle is to undergo chain transfer reaction.

The purpose of adding n-dodecyl mercaptan during the polymerization process is to regulate the relative molecular weight, and the principle is to undergo chain transfer reaction.

1.The role of n-dodecyl mercaptan in acrylic resin

In the production of acrylic resin polymerization (such as hammer pattern paint), the addition of n-dodecyl mercaptan can effectively regulate the molecular weight distribution of the resin, resulting in good leveling and uniform viscosity of the resin, and making the paint film visually bright.

In order to regulate molecular weight, it is necessary to add molecular weight regulators. Molecular weight regulators can be captured by long-chain free radicals, which transform into a dead macromolecule and regenerate a free radical with initiation and elongation activity. Therefore, good molecular weight regulators only reduce the degree of polymerization or molecular weight, and have no effect on the polymerization rate. The commonly used varieties now are thiol compounds, such as n-dodecyl mercaptan, secondary dodecyl mercaptan, tert dodecyl mercaptan, mercaptoethanol, mercaptoacetic acid, etc. Mercaptoethanol can introduce hydroxyl groups on the macromolecular chains after transfer and trigger again, reducing the amount of radial monomers used in the synthesis of hydroxylated acrylic resins.

NDM is also used in POP (polyolefin plastic), polyurethane lotion polymerization and other fields.

2.Other applications and uses of n-dodecyl mercaptan

① Molecular weight regulators for ABS resin, styrene butadiene rubber (SBR), nitrile rubber (NBR), and high impact polystyrene (M-HIPS) products

②Polyvinyl chloride PVC, polyethylene PE, polypropylene PP stabilizer, antioxidant

③Provide sulfur components as sulfur tin stabilizers for PVC

④Chloroprene rubber UV absorber

⑤ Modified oil, polyurethane foam plastic stabilizer

⑥Raw materials for mining flotation agents, rust inhibitors, insecticides, surface hydrophobic modifiers, and fungicides