Overview of Arkema Crayvallac MT, Micro powder Rheological Additive Polyamide Modified Castor Oil Derivatives:
Arkema CRAYVALLAC MTIt is a rheological additive of hydrogenated castor oil derivatives modified with polyamide, applied in solvent based and solvent-free coatings. CRAYVALLAC MT The main characteristics are:
100% active ingredient
Endow the system with shear thinning rheological properties, and its viscosity gradually recovers over time
Good recoating ability
Suitable for solvent-free systems
Excellent anti sagging performance
Very good anti sinking performance
Excellent storage stability
arkema CRAYVALLAC MT Recommended Yield:Anti sinking and anti current hanging: 0.2-1.5%
Arkema CRAYVALLAC MT is suitable for coating systems using aliphatic hydrocarbon solvents, aromatic hydrocarbon solvents, and mixed solvents of aromatic hydrocarbon solvents and alcohols. Compared with pure hydrogenated castor oil derivatives as rheological agents, Arkema MT is more solvent resistant, which further reduces the risk of coarsening and false thickening.
Below is a list of CRAYVALLAC MT Different activation temperatures required in different solvent systems:
Aliphatic hydrocarbon solvents: 35-75 ℃
Aromatic hydrocarbon solvents: 30-50 ℃
Aromatic hydrocarbon solvents/alcohol mixed solvents: 30-50 ℃
Solvent free system: 40-60 ℃
| Product Code | type | Addition amount (wt%) |
| crayvallac mt | Polyamide modified castor oil derivatives | 0.2-2.0 |
| Product specifications | Other properties |
Particle size distributionMalven Mastersizer Laser Particle Size Distribution Analyzer(CR 005) | Specific gravity (25 ℃, g/cm3), (CR006) | one point zero two |
DV.2 min
DV.8 max | 4µm
20µm | Bulk density, g/cm3, (CR 016) | 0.4-0.6 |
| Capillary melting point determination (CR 003) | 130-140℃ | appearance | Grey white powder |
Summary of the method for adding castor oil derivatives as a micro powder rheological additive, Crayvallac PC:
Disperse at high speed together with the base material, dispersion temperature: 30-75 ℃ in aliphatic hydrocarbon solvents and 30-50 ℃ in aromatic hydrocarbon solvents.
Akoma Crayvallac PC, a micro powder rheological aid derived from castor oil, detailed addition method and steps:
Arkema CRAYVALLAC MT It is best to add the pigment and filler together during the grinding stage. Disperse at high speed using a high-speed disperser to the recommended activation temperature mentioned above. In order to achieve the optimal effect of CRAYVALLAC MT, high-speed dispersion is still required for 20-40 minutes after reaching the activation temperature.
The high-speed disperser is the most ideal dispersing equipment because it can provide the shear force and temperature required to activate the Arkema CRAYVALLAC MT, thereby fully activating the CRAYVALLAC MT. The activation process is a process of transforming Arkema CRAYVALLAC MT from a powder state into 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 a low shear state, 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 dissolved Arkema MTDuring the cooling process, it will thicken. It's dissolved Arkema MTThe result of recrystallization precipitation in an uncontrollable form.
Like all systems that use hydrogenated castor oil derivatives as rheological agents, Arkema CRAYVALLAC MT is usedThe system sometimes
Forming a false thickening phenomenon. If the system is not stirred during the cooling process, false thickening may occur. This phenomenon can be avoided by slowly stirring the system to below 40 ℃ during the cooling process before packaging. Of course, false thickness is a temporary phenomenon that can be eliminated during construction through high shear forces.
Due to the potential occurrence of false consistency, it is necessary to ensure that the sample is not affected by false consistency during the detection process. Mechanical stirring of the sample for a few minutes before testing can eliminate the phenomenon of false thickening.
In addition to solvent based coating systems, CRAYVALLAC MT It has also been successfully applied in other industries such as ink, glue, paste, putty, sealant, potting, grease, and lubricants.
Given the different formulation systems, production processes, and application fields, we strongly recommend using CRAYVALLAC MTConduct 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.
Arkema Crayvallac PC storage requirements:
Arkema CRAYVALLAC MT should be stored in its original packaging bag, placed in a dry and temperature range of 5-30 ℃, and protected from direct sunlight or freezing. The product is valid for four years when stored under the above conditions.
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