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Yuan Lei will tell you about nano calcium carbonate in two minutes.

Release time:

2024-01-29 09:37

 

Yuan Lei will tell you about nano calcium carbonate in two minutes.

 

Nano calcium carbonate is also called ultra fine calcium carbonate. The standard name is superfine calcium carbonate. Nano calcium carbonate application of the most mature industry is the plastic industry is mainly used in high-grade plastic products. PVC plastisol for automotive interior sealing. Can improve the rheology of plastic masterbatch, improve its formability. Used as a plastic filler has the effect of toughening and reinforcing, improving the bending strength and bending modulus of elasticity, thermal deformation temperature and dimensional stability of the plastic, while also giving the plastic thermal retardation.

Nano calcium carbonate used in ink products shows excellent dispersibility and transparency and excellent gloss, and excellent ink absorption and high drying. Nano calcium carbonate is used as ink filler in resin ink, which has good stability and high gloss, and does not affect the drying performance of printing ink. strong adaptability and other advantages.

The paper industry is the most potential market for nano-calcium carbonate. At present, nano calcium carbonate is mainly used for special paper products, such as sanitary napkins for women, diapers for babies, etc. Nano active calcium carbonate as a papermaking filler has the following advantages: high light shielding, high brightness, can improve the whiteness and light shielding of paper products; high expansion, can make paper mills use more fillers and greatly reduce the cost of raw materials; fine particle size, uniform, more uniform products, smooth; high oil absorption value, can improve the expected firmness of colored paper.

 

As a pigment filler in the paint industry, nano-calcium carbonate has the advantages of fine, uniform, high whiteness and good optical properties. Nano-scale ultrafine calcium carbonate has steric hindrance effect. In the paint, can make the formula in the larger density of the lide powder suspension, anti-settling effect. After the paint is made, the whiteness of the paint film is increased, the gloss is high, and the hiding power is not reduced. It is mainly used for high-end car paint.

One of the main application markets of nano calcium carbonate in rubber industry. The rubber added with sodium calcium carbonate has higher vulcanizate growth rate, tear performance, compression deformation and yield resistance than that added with general calcium carbonate. After adding nano-calcium carbonate treated with resin acid, the tear strength of some rubber products increased by more than 4 times.

 

Nano calcium carbonate in the feed industry can be used as a calcium supplement, increase the calcium content of feed; used in cosmetics, because of its high purity, good whiteness, fine particle size, can replace titanium dioxide.

The industrial preparation method of nano-active calcium carbonate, which is carbonized by carbon dioxide gas in a suspension of a certain concentration of calcium hydroxide. The nucleation rate of calcium carbonate nuclei is controlled by the temperature of calcium hydroxide suspension and the flow rate of carbon dioxide gas. After carbonization to form a certain number of nuclei, the nucleation control is transformed into crystal growth control; then, the uniformly dispersed cubic nano calcium carbonate particles are subjected to a liquid phase surface coating treatment. The obtained nano-active calcium carbonate particles are controllable between 25 ~ 100nm, cubic, with a specific surface greater than 25 m2/g, a particle size distribution GSD of 1.57, an oil absorption value less than 28g/100g calcium carbonate, and no agglomeration phenomenon. The obtained product has excellent performance and can be used as a functional filler in high-grade rubber, plastic and automobile primer.

An industrial preparation method of nano-active calcium carbonate, characterized in that the method comprises the following steps:(1) introducing a gas containing carbon dioxide into a suspension of Ca(OH)2 until the carbonization rate reaches 5-40%, adding a crystal form modifier to continue the carbonization until the pH is 8.0-9.0, adding a surface charge and steric hindrance modifier to continue the carbonization until the pH is 6-7.5, generating nano-scale cubic calcium carbonate; the crystal form regulator is one of phosphate, sulfate, acetate, citrate, monosaccharide or polysaccharide and a mixture thereof, and the addition amount is 0.05-3.0% of the weight of the slurry; the surface charge and steric hindrance regulator is one or more of phosphate, sulfate, chloride, triethanolamine, and sodium dodecylbenzenesulfonate; the addition amount of surface charge and steric hindrance regulator is 0.1-4.0% of the weight of calcium carbonate;(2) one or two of fatty acid or water-soluble titanate coupling agent are prepared into aqueous solution coating agent; The fatty acid is C12 ~ C18 fatty acid;(3) The nano calcium carbonate slurry is heated to 45-95 ℃, and then the coating agent is added, the coating agent is added in an amount of 0.5 to 3.5% based on the weight of the calcium carbonate, and the coating treatment time is 0.5 to 3.5 hours. The slurry is filtered and dried to obtain nano-active calcium carbonate.

 

 

 

 

 

 

Two minutes, calcium carbonate, nano, join, carbonization, conditioner, active, with, filler, ink

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