How To Solve The Problem Of Carbonic Acid Agglomeration And Difficulty In Dispersion In Breathable Membranes

How to solve the problem of carbonic acid agglomeration and difficulty in dispersion in breathable membranes? Breathable films have the function of being impermeable to liquid water and permeable to water vapor. The pore size is 0.001-1μm, and can only pass water vapor with a diameter of 0.4nm. Water, urine, and blood with a diameter of about 100μm cannot pass through. Breathable membranes are used for women’s sanitary napkins, baby diapers, elderly diapers, taxi driver diapers, long-distance travel diapers, surgery, or paralyzed patients. The amount is increasing. The current development direction is antibacterial and biodegradable.

1. What is the principle of breathable membranes?

Permeability principle: After the inorganic powder is added, it is stretched longitudinally at a high multiple, the resin is deformed but the calcium carbonate is not deformed, and a gap is generated between the resin and the calcium carbonate. The gap size is within the range of 0.001-1?m.

2. What is the formula of breathable membrane masterbatch?
The formula of breathable film masterbatch includes: resin, pore-forming agent, dispersant, coupling agent, lubricant.

(1) Dispersant:

The dispersion effect is very demanding. It must be evenly dispersed without any agglomeration, otherwise it will cause large holes and water leakage in the film. Therefore, the amount of dispersant added in the formula should be relatively large; second, the quality of the dispersant should be good, for example, the molecular weight should be above 3500.

(2) Lubricant

First, the lubricant is required to be pH neutral in the end to prevent strong acid and alkali residues in the film from harming human skin; second, if non-pH neutral additives are used, it is best to remove them at high temperature before the final stretching stage of processing to avoid residues as much as possible; third, the amount of non-neutral additives added should be reduced as much as possible. For breathable film materials, it can be made into a special material with a calcium carbonate content of 50%, or it can be made into a masterbatch with a calcium carbonate content of 85%.

Tianshi breathable membrane special dispersant has excellent lubrication and dispersibility, can quickly reduce the viscosity of the slurry, increase dispersibility and fluidity, quickly increase the solid content, and the viscosity of the slurry is stable after dispersion;

In addition, it can also coordinate the overall balance of the stretching temperature, stretching ratio, stretching rate and stretching gap of the breathable membrane, and improve the air permeability, mechanical properties, consistency and appearance of the breathable membrane.