%{tishi_zhanwei}%

Yuan Lei's Little Knowledge | Application of Heavy Calcium, Light Calcium and Nano Calcium in Coatings

Release time:

2024-01-29 09:34

Calcium carbonate is the most widely used pigment in coatings, which plays the role of filling the skeleton and substrate in the paint film, and improves the performance of the coating. So what are the applications of heavy calcium carbonate, light calcium carbonate and nano calcium carbonate in coatings? Let's take a look at the following.

 

 

heavy calcium carbonate

Heavy calcium carbonate is the first filler in the world's coating industry. China's coating industry consumes more than 400000 tons of heavy calcium every year. Among them, architectural coatings, paper coatings and powder coatings are the most consumed areas of heavy calcium.

(1) As an extender pigment, it has a filling effect to make it delicate, uniform and high whiteness.

(2) has a certain dry hiding power, the general use of ultra-fine products, when its particle size and titanium dioxide particle size close, can improve the covering effect of titanium dioxide.

(3) can improve the film strength, water resistance, dry, scrub resistance.

(4) Improve color retention.

(5) Reduce costs, the use of 10% to 50%.

 

 

Light calcium carbonate

Compared with heavy calcium, light calcium is artificially synthesized, and the crystal form and composition are easy to control, so light calcium can be endowed with multiple functions, and the relatively high specific surface area makes the reinforcing effect of powder in the coating obviously better than heavy calcium.

(1) As an extender pigment, it has a filling effect, is delicate and increases whiteness.

(2) has a certain dry covering power.

(3) the density is small, the specific surface area is large, with a certain suspension, play a role in anti-settling.

(4) Reduce costs.

(5) increase the feel. Disadvantages: easy frosting, swelling, thickening, the amount should not be too large, can not be used in exterior wall coatings.

 

 

nano calcium carbonate

With the rise of nanotechnology, nano calcium carbonate as a cheap nano particles, in the coating industry has become a hot topic, compared with heavy calcium and light calcium, although the cost increases, and has a better reinforcing effect, but nano calcium carbonate in the coating can also improve the coating hiding power, gloss, transparency, quick drying, and stability. In some industries, such as automotive coatings, architectural coatings, etc., nano calcium carbonate can partially or completely replace the high price of titanium dioxide, in order to reduce the cost of enterprises.

(1) Building materials: nano calcium carbonate due to the existence of "blue shift" phenomenon, in the latex paint can shield ultraviolet light, play a heat insulation effect, the anti-aging properties of the coating has been improved. Applied to exterior wall coatings, the coatings exhibit strong "hydrophobicity". The cracking strength and contamination resistance of the coating are enhanced.

(2) Coating and topcoat: because the nano calcium carbonate particles dispersed in the coating are extremely small, under a certain volume fraction, the number of particles increases sharply, the average distance between particles decreases, and the chance of any two particles entering the mutual attraction zone increases rapidly, resulting in an increase in viscosity. When the material is under stress, the sliding between a large number of particles attracts more impact energy, this is reflected in a wide temperature range with a higher damping value, and the treatment agent layer on the surface of nano calcium carbonate can effectively transfer and relax the stress on the interface between organic and inorganic materials, and better absorb and disperse impact energy. Considering the flexibility of the treatment agent itself, the mechanical strength of the coating film is improved.

 

Material, calcium carbonate, nano, coating, with, increase, improve, coating, effect

Yuanlei Classroom | As a key material, how many applications does precipitated barium sulfate have?

2024-07-11


The appearance of precipitated barium sulfate is a white amorphous powder, with a relative density of 4.50 (15 ℃) and a melting point of 1580 ℃. Due to its high refractive index (1.63-1.65), it exhibits a relatively white color and a certain degree of covering power. It is almost insoluble in water, ethanol, and acid, soluble in hot sulfuric acid. It is easy to form mixed crystals with potassium permanganate, calcium carbonate, or metal nitrates, and can be reduced to barium sulfide with carbon at high temperatures.

Yuan Lei's Little Knowledge | Application of Wet Mica Powder in Other Fields

2024-07-03


Wet mica powder is a high-quality mineral filler made from high-quality mica raw materials, which are washed, impurity removed, soaked, crushed, low-temperature dried, and screened. Its unique production process maximizes the preservation of mica's sheet-like structure, large diameter to thickness ratio, high refractive index, high purity, high whiteness, high gloss, low sand and iron content, and other industrial characteristics that cannot be compared to dry process technology. The unique performance of wet mica powder has greatly improved its application in multiple industries such as plastics, paint, rubber, etc., and has a significant effect on improving product performance and reducing costs.

Yuan Lei's Little Knowledge | Application of Wet Mica Powder in Resin and Plastics

2024-06-27


Wet mica powder is a high-quality powder with good whiteness, large diameter to thickness ratio, smooth surface, and uniform particle size obtained by special processes of crushing, drying, and grading mica fragments after washing, impurity removal, and purification. It is widely used in rubber, plastics, coatings, paints, cosmetics, and other industries.