coating Thickening rheological agent with montmorillonite
Selection of high quality montmorillonite thickening rheological agent for coating Bentonite It is a natural montmorillonite product with high purity, high whiteness, super dispersibility and high consistency, which is made from raw materials through beneficiation, pulping, activation, flaking, ultra-fine classification and purification, and chemical modification,
Principle: Gelation mechanism in water system, the crystal structure unit of magnesium lithium silicate gel is nanometer A tiny slice of a meter. The surface of the small piece is full of exchangeable cations, mainly Na. When the gel particles are mixed with water, the water and Na are adsorbed on the surface of the sheet, and the gel is stretched along the sheet. At this time, the particles expand rapidly until the sheet is separated. Because the slice surface is negatively charged and the end face is positively charged, the separated slice end face is attracted to the surface of another slice, thus rapidly forming a three-dimensional colloidal structure, namely, card palace structure, which increases the viscosity of the system, and has high suspension, thickening, thixotropy, good compatibility, and chemical stability. It is an ideal thickening rheological agent for water systems.
Product Functions and Features ：
Synergistic thickening and compatibility —— Inorganic gel and agricultural production system Thickening agent Use together to give play to their better performance. Montmorillonite inorganic gel helps to coordinate viscosity and yield value, while colloid and polymer are improved in the presence of electrolyte, surfactant and other water-soluble substances clay Stability.
Acid and alkali resistance —— A small amount of acid, alkali and salt added to the hydrated gel of montmorillonite inorganic gel will not become dilute or flocculate. The gel has good stability and can usually be used in media with a pH value of 4-12. Their pH stability can also be further extended with protective colloid such as xanthan gum.
Resistance to degradation —— Because they are minerals, montmorillonite inorganic gels are not decomposed by bacteria, heating or excessive mechanical shearing. They are insoluble in water and some solvents, and will not mildew after long-term storage.
Thixotropy —— Inorganic gel has good thixotropy, high shear force and low viscosity, low shear force and high viscosity, which can give the product excellent leveling and anti sagging performance, and improve the brushing performance of water-based coatings.
Washability —— The layer of montmorillonite is negatively charged, which can attract the relative groups of agricultural production system substances in the coating, so that it can be inserted into the interlayer to form a montmorillonite agricultural production system complex. After dehydration, it has hydrophobic property, improving the scrub resistance of the coating.
Technical indicators:
Technical indexes of montmorillonite inorganic thickening rheological agent
Product model | RL-A01 | RL-A02 |
Appearance characteristics | White powder | White powder |
Volatile matter (105 ℃)%, ≤ | ten | ten |
Expansion capacity, ml /g | >90 | >95 |
Colloid value, ml/15g | >500 | >500 |
Viscosity 25 ℃ (10%) mpa. s, ≥ | ten | twelve |
Thixotropic index, ≥ | five | four |
PH value | 8-11 | 8-11 |
Water dispersion fineness μ m | ≤10 | ≤10 |
Bulk specific gravity | 600-800g/L | 600-850 g/L |
usage method
（1） Pregel method
1. Preparation of pregel Hydrophilic high-purity modified montmorillonite thickening thixotropic agent powder is mixed with water to make slurry, with the proportion of powder: water=1:6. Dilute the above evenly dispersed slurry to powder: water=1:9, and then mix at high speed for 5-10 minutes for standby.
2. Adding of pregel Add the formula amount of water, film forming agent, defoamer, bactericide and dispersant into the container, and mix them together evenly. Add pigment, filler and gel slurry into the mixed solution while stirring to mix dispersant.
3. Add emulsion later for mixing and adjust later.
（2） Direct addition method
1. With water as the mixed liquid, slowly add the formula amount of hydrophilic high-purity modified montmorillonite thickening thixotropic agent powder in the state of high-speed stirring until the thixotropic gel is fully formed.
2. Add the film forming agent, defoamer, bactericide and dispersant into the above dispersion solution, and stir evenly.
3. Add the pigments, fillers and some additives into the above stirring solution and disperse them evenly.
4. Add emulsion for mixing, and then adjust it.
purpose
It is widely used as a thixotropic agent, latex stabilizer, thickener and pesticide carrier for suspensions and pastes in daily chemicals such as building coatings, water-based coatings, latex paints, toothpaste, cosmetics, rubber, paper making, etc; In the pharmaceutical industry, it is used as a binder, disintegrant and drug stabilizer for tablet drugs; In latex coatings, water dilutive coatings and latex adhesives, it has a strong thickening effect, but it can maintain good fluidity. It has thickening, gelation, and can prevent water separation and sagging. At the same time, it has strong acid resistance and salt resistance. It can be used for medium * * * exterior wall painting and printing ink, with the amount of 0.2%~2%; It is used as suspending agent and thixotropic agent of base material in special casting coatings and various ceramic colored glaze coatings; The performance of this series of products is better than that of CMC alone in many aspects HEC and other agricultural production system polymers.
Product packaging
25kg/bag, packed in woven bags.
Product storage
The product should be stored in a cool and dry place.
