Chemical composition: Cetyl trimethyl ammonium chloride
This product is a light yellow solid, easily soluble in isopropanol and soluble in water. It has good compatibility with cationic, non-ionic and amphoteric surfactants. Avoid using it in the same bath with anionic surfactants. It is not suitable to heat for a long time above 120℃. This product is an emulsifier for natural, synthetic rubber, and silicone oil; an emulsifier for asphalt emulsifiers and neoprene latex asphalt waterproof coatings; an antistatic agent and softener for synthetic fibers, natural fibers and glass fibers; polyester silkworm additives; leather Fatliquor; Conditioner for hair conditioner; Phase transfer catalyst; Silkworm silkworm disinfectant; Emulsion foaming agent; Modifier for organic bentonite, etc.
As thickeners and thixotropic agents designed to control precipitation, they can build a three-dimensional structure through hydrogen bonding, which thickens the water phase when the paint is at rest. Under shear conditions, these structures can be easily broken, making the coating easy to apply. Among the inorganic thickeners, talc shows a good thixotropic effect in latex paint, thanks to its thin layer structure. Figure 5-27 shows the thickening effect of hydrophilic layered silicate. Figure 5-28 is the layered silicate gel structure (data provided by Lapo nite, technical literature, Laporte Industries Ltd., Cheshire/GB). Sheet-like space structure
5. In the water-based system, the thixotropic rheological effect of titanate can also be achieved by the combination of organic titanate and general-purpose or associative thickener. The titanate group is partially hydrolyzed in an aqueous solution to form a hydrogen bond, which interacts with the pigment and other functional groups on the surface of the base material. When the shear is formed, the network structure micronized polytetrafluoroethylene (ptfe) powder is destroyed and the viscosity drops; Figure 5-28 After the shear force of the bottom silicate gel structure disappears, the viscosity recovers again. In the emulsion system with stable protective gel, the most effective is (amino alcohol) titanate.
In water-based and solvent-based systems, the adjustment of rheological properties can also be achieved with microgels with partial binder groups. Microgels are polymer emulsions that contain crosslinkable monomers, such as methyl hydroxypropyl acrylate, methyl glycidyl acrylate, or tripropyl methanol triacrylate. When the polymerization is completed, the latex particles are separated from the water phase or coagulated with an organic solvent, and the remaining polymerized particles can be dissolved by the solvent to form a colloidal structure and cross-linked in parallel. Polyurethane or polyepoxy particles can complete emulsion polymerization through addition reaction, or polycondensation reaction, or as a seed emulsion, or with different polymerization stabilization systems. Under the influence of shear, the solvent is released from the microparticles, and the viscosity becomes lower. Due to the potential cross-linking effect of the microgel particles in the film formation process, the microgel changes the flow rate without changing the amount of the base material. Performance 67].
The crosslinking density of microgels can affect the viscoelasticity of the dispersion. Therefore, the rheological properties of automotive coatings used on metal substrates can be measured with a controllable pressure rheometer and oscillation measurement method. Sure.
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