Nano calcium has different modification effects in different adhesives

Nano calcium carbonate has different modification effects in different adhesives, and can improve its rheological properties in PVC plastisol; In silicone structural sealant, it can increase strength and wear resistance; It can provide incremental reinforcement and heat resistance in hot melt adhesive; It can play a role in thickening and thickening in water-based adhesives.

In production, it has the following characteristics

Nano calcium carbonate has low water content, near neutrality, and good chemical stability, and does not undergo chemical reactions with cured adhesives in adhesives.

The large amount of nano calcium carbonate added can significantly reduce the cost of adhesive products (such as using more than 50% in silicone rubber gaskets and 20-30% in polyurethane adhesives).

Nano calcium carbonate has a reinforcing effect, which can improve the mechanical properties of adhesives, reduce their shrinkage rate and thermal expansion coefficient during curing, increase thermal conductivity, improve heat resistance and adhesion, enhance mechanical strength (hardness and compression strength) and corrosion resistance; It can also lubricate the adhesive, improve the process conditions of operation, and comprehensively enhance the bonding performance.

Nano calcium carbonate has a small particle size and a large specific surface area. After certain surface treatment, it has good compatibility with adhesives and can be used as a thixotropic agent in adhesive systems to adjust the viscosity of adhesives, prevent sagging during vertical surface construction, and improve their retention characteristics.

Nano calcium carbonate is easy to color during the process of making colorants and will not affect the color of the product.

The quality factors of the filling effect of nano calcium carbonate in rubber mainly include the following aspects:

1、 Among the different crystal forms of nano calcium carbonate, the chain like nano calcium carbonate has the best reinforcing effect on rubber.

2、 The application of nano-sized calcium carbonate in rubber, the finer the particles, the larger the specific surface area of mutual infiltration with rubber, making it increasingly difficult for calcium carbonate particles to disperse, especially below 80nm. Due to the increase in surface energy, it is easy to generate heat during rubber mixing and cause stick mixing.

3、 The higher the oil absorption value of nano calcium carbonate used for rubber, the better the wettability and reinforcement of calcium carbonate on rubber.

4、 Water is used as a filler for rubber. When the moisture content of nano calcium carbonate decreases, the burning time for vulcanization is shortened, which is beneficial for improving the vulcanization speed.

5、 The pH value of nano calcium carbonate mainly affects its vulcanization rate in rubber applications. The pH value requirement for general nano calcium carbonate is 9-10.5. A high pH value promotes sulfurization, but a low pH value results in slow sulfurization rate and long burning time, thereby extending processing time and increasing energy consumption.