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YuanLei little knowledge | Application of nanometer calcium carbonate in rubber
Nano calcium carbonate refers to the particle size of 1-100nm functional inorganic filler, widely used in rubber, plastics, paper, ink, paint, sealant and adhesives, medicine, toothpaste, food and other fields. Let's take you to understand the application of nano calcium carbonate in rubber.
Nano - sized calcium carbonate has a good semi - reinforcing effect in rubber because of its three-dimensional structure and good dispersibility. Mainly used in natural rubber, nitrile, butadiene, rubber, etc., suitable for tire, rubber hose, tape, oil seal, auto parts and other rubber products. The rubber products with nanometer calcium carbonate are much stronger than ordinary calcium carbonate in elongation, compression deformation, yield resistance and tear resistance.
Tire: Nano calcium carbonate can partially replace carbon black and white carbon black in the production of automobile tires, but there is still a gap in the reinforcement effect, so in the application of less stressed parts, such as tire side, curtain glue, air tight layer glue, inner layer glue, buffer glue, etc. In production, nanometer calcium carbonate combined with active zinc oxide can greatly improve the strength of tire tread rubber.
Hose and tape: nano calcium carbonate in the hose, tape mainly strengthen, white, and improve the dispersion of rubber material effect.
Wire and cable: nano calcium carbonate is generally used for mining wire and cable, high voltage wire and cable, Marine wire and cable protective sleeve and electrical wire and cable adhesive.
The technical requirements of rubber industry for nano calcium carbonate are as follows:
Oil absorption value: The rubber industry requires higher oil absorption value of nano calcium carbonate. The higher the oil absorption value, the better the wettability and reinforcement of rubber.
Crystal shape: Because rubber requires very high reinforcement performance, the crystal shape of nano-calcium carbonate should be mainly in the shape of chain or chain. During processing, the chain segments will intertwine, which can enhance the strength of the system.
Particle size: used in rubber nano calcium carbonate particle size is generally appropriate to 80 ~ 120nm, the particle size is too large to play the effect of reinforcing, and the particle size is too small and the contact area of rubber infiltration increases, making it difficult to disperse, affect the rubber mixing.
Moisture: moisture control should not be higher than 0.5%, if the moisture is too high, the coking time of vulcanization is prolonged, which is not conducive to the promotion of vulcanization rate.
pH value: The pH value of nano-calcium carbonate mainly affects its curing rate, which should be controlled within 9.5 ~ 10.5. If pH value is low, the curing rate will slow down, reduce efficiency and increase energy consumption.
After surface modification treatment of nano calcium carbonate and rubber has good compatibility, with reinforcing, filling, color, improve the performance of the process and products, rubber can be easy to mix, easy to disperse, after mixing gum soft, rubber surface smooth; It can improve the extensibility, tensile strength and tearing strength of products. Can reduce the rubber content or partially replace titanium dioxide, white carbon black and other expensive white fillers, improve the market competitiveness of products.