Dispersion of Sodium Hexametaphosphate in Papermaking

What is the principle of using sodium hexametaphosphate as a dispersant in papermaking?

Paper is a great invention of mankind. Papermaking not only facilitates people's writing, but also promotes cultural transmission. No matter what type of paper is used, the quality control is relatively strict. With the development of modern industry, many additives are also used in papermaking. Sodium hexametaphosphate is one of the widely used dispersants.

Dispersion of Sodium Hexametaphosphate in Papermaking.

In the papermaking process, fibers, fillers and some additives are all water-insoluble, and they tend to aggregate themselves in aqueous solution, and different materials are often kept as far away as possible due to incompatibility, so it is difficult to obtain uniform performance. , ideal strength paper. Adding sodium hexametaphosphate as a dispersant can make the surface of solid particles form a bimolecular layer structure, and the polar end of the outer dispersant has a strong affinity with water, which increases the degree of wetting of solid particles by water. Electrostatic repulsion keeps away to achieve good dispersion effect.

The mechanism of sodium hexametaphosphate dispersant is that the addition of anionic or nonionic surfactants in the slurry reduces the surface tension of the slurry suspension, improves the wetting performance of the fiber surface, and reduces the fiber's hydrophobicity. Flocculation, its mechanism of action is:

1. Give the surface charge of the fiber, making it almost repulsive (anionic surfactant);

2. Cover the fiber surface and play the role of protective colloid;

3. Form a viscosity state around the fiber to prevent fiber collision and aggregation;

4. Surfactant has good adsorbent suspension characteristics, adsorbed on the surface of the fiber, forming a water film, so that the fibers slide over each other without entanglement;

5. The change of fiber surface wettability also reduces the friction force between fibers and reduces the chance of fibers sticking to each other.

In the use of papermaking, the papermaking dispersant has high dispersion efficiency. Sodium hexametaphosphate can be connected to each other to form a helical long chain, which can be adsorbed on the particle surface to enhance the hydrophilicity of the particle, and significantly increase the negative potential of the particle surface. The electric double layer is more stable and the dispersion effect is better.

In paper production and use, the paper dispersant has high dispersion efficiency. Sodium hexametaphosphate can be interconnected and polymerized into long helical chains, which can be adsorbed on the particle surface to enhance the hydrophilicity of the particle, and significantly increase the negative potential of the particle surface, so that The electric double layer is more stable and the dispersion effect is better.

Water quality in papermaking also plays an important role. Poor water quality contains a lot of metal ions such as calcium, magnesium and iron. Sodium hexametaphosphate dispersant not only has the function of dispersing, but also has the function of complexing agent, because sodium hexametaphosphate can complex Calcium, magnesium and other metal ions in the water are not easy to form precipitation, so that the paper color can better meet the needs of users.

There are many dispersants used in the papermaking industry. The dispersion of sodium hexametaphosphate in papermaking can improve the softness of paper and meet the color requirements.

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