Overview of Akoma Crayvallac SF, Micro powder Rheological Additive Castor Oil Derivatives:
arkema CRAYVALLACSFIt is a rheological aid for hydrogenated castor oil derivatives modified with polyamide, which enhances temperature resistance and solvent resistance.arkema SFThe main characteristics are:
100% active ingredient
Endow the system with shear thinning rheological properties, and its viscosity gradually recovers over time
More temperature resistant
More resistant to strong polar solvents
Excellent anti sagging performance
Very good anti sinking performance
Good anti sinking performance
Good recoating properties
arkema CRAYVALLACSFRecommended usage:
Anti sinking and anti current hanging: 0.2-1.5%
| Product Code | type | Addition amount (wt%) |
| crayvallac sf | Polyamide modified castor oil derivatives | 0.2-1.5 |
| Product specifications | Other properties |
| Particle size distribution (Malven Mastersizer laser particle size analyzer) (CR 005) | Specific gravity (25 ℃, g/cm3), CR006 | one point zero two |
DV.2 min
DV.8 max | 4um
20um | Bulk density, g/cm3, CR 016 | 0.4-0.6 |
| Capillary melting point determination (CR 003) | 130-140℃ | appearance | Grey white powder |
arkema CRAYVALLACSFSummary of methods for adding castor oil derivatives as micro powder rheological agents:
Disperse at high speed together with the base material, dispersion temperature: 30-65 ℃ in aliphatic hydrocarbon solvents and 30-65 ℃ in aromatic hydrocarbon solvents/alcohol mixed solvents.
arkema CRAYVALLACSFDetailed method and steps for adding castor oil derivatives as micro powder rheological agents:
arkema CRAYVALLAC SF Suitable for coating systems using aromatic hydrocarbon solvents, mixed solvents of aromatic hydrocarbon solvents and alcohols. Compared with other rheological agents derived from hydrogenated castor oil, due to arkema SF Containing unique polyamide, this CRAYVALLAC SF More resistant to high temperatures and solvents, which further reduces the risk of coarsening and false thickening. Below is a list of CRAYVALLAC SF Different activation temperatures required in different solvent systems:
althoughCRAYVALLAC SFIt can also be used in mixed solvents of aromatic hydrocarbon solvents, ethers, and esters, but special attention should be paid to avoiding high temperatures.
arkema CRAYVALLAC SFIt is best to add the pigment and filler together during the grinding stage and disperse them at high speed to the recommended activation temperature mentioned above. In order to achieveCRAYVALLAC SFThe optimal effect is still to disperse at high speed for 20-40 minutes after reaching the activation temperature.
A high-speed disperser is the most ideal dispersing equipment because it can provide activationarkema CRAYVALLAC SFThe required shear force and temperature to fully activatearkema SF. The activation process is a process that involvesCRAYVALLAC SFThe process of transforming from a powder state to a fibrous network structure with interactions. It is precisely this network structure that ultimately endows the system with shear thinning properties. This shear thinning characteristic provides the ability to maintain high viscosity under low shear conditions, thereby achieving excellent anti settling performance; During construction, that is, under high shear conditions, the viscosity of the system will decrease. The ultimate result is that the system has good anti sinking properties and is easy to construct.
After the construction is completed, the system returns to low shear conditions, and the network structure in the system is re formed. The viscosity of the system gradually recovers over time. The process of gradually recovering viscosity over time is called "thixotropy", which enables the system to achieve good leveling and anti sagging performance after viscosity recovery.
When the activation temperature is too low, too high, or the activation time is not enough, it will lead to poor formation of the interacting network structure. Excessive activation temperature will cause the dissolution of the network structure. Partially dissolvedarkema CRAYVALLAC SFDuring the cooling process, it will thicken. It has dissolvedCRAYVALLAC SFThe result of recrystallization precipitation in an uncontrollable form.
Like all systems that use hydrogenated castor oil derivatives as rheological agents, the use ofarkema SFThe system sometimes forms a false consistency phenomenon. The phenomenon of false thickening occurs when the system is not stirred during the cooling process, so this phenomenon can be avoided by slowly stirring the system to below 40 ℃ during the cooling process before packaging. Of course, this false thickness is a temporary phenomenon that can be eliminated under high shear conditions during construction.
Due to the potential occurrence of false consistency, it is necessary to ensure that the sample is not affected by this false consistency during the QC process. Just mechanically stir the sample for a few minutes before testing.
In addition to solvent based coating systems,CRAYVALLAC SFIt has also been successfully applied in other industries such as ink, glue, paste, putty, sealant, grease, and lubricants.
Given the different formulation systems, production processes, and application fields, we strongly recommend usingCRAYVALLAC SFConduct a comprehensive evaluation to ensure that it meets the requirements. In addition, when coating construction is carried out under poor ventilation conditions, or when the substrate temperature is too high, or during hot spraying, additional attention may be required.
Storage requirements for Akoma Crayvallac SF:
arkema CRAYVALLAC SFIt should be stored in the original packaging bag, placed in a dry environment with a temperature of 5-30 ℃, and protected from direct sunlight or freezing.
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