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The key factor in the pretreatment sodium carboxymethyl cellulose

- Aug 21, 2014 -

In order to increase the sodium carboxymethyl cellulose and the accessibility and reactivity of the chemistry and method of treatment is usually a large margin, the reaction mechanism of the reagent mixture of sodium carboxymethyl cellulose, and the reaction, to increase the swelling of the surface-active products, to improve microporous structure.

We already know, sodium carboxymethyl cellulose, soluble in water, carboxymethyl cellulose hydrogen bonds can be disconnected between the molecular chains, the open pore structure, thus greatly increasing the sodium carboxymethyl cellulose the internal surface area, increasing the reaction product performance, and therefore carboxymethyl cellulose alkalization, etherification reaction, there must be a water can.

By expansion of moist sodium carboxymethyl cellulose, a surface area can be increased to 50 times, the rate of esterification and the insulating four-fold increase. After Hydra swelling, chemical reagents for penetration, diffusion can play a decisive role. The number of pore diameter 5.Ox10m promote increased rapidly. In phase basified sodium carboxymethyl cellulose, sodium ions water hydration layer formed around separate primitive fibrils to each other. Bolls of the cotton fiber cell wall, saturated by water, the biological state of the base is formed of cotton fibers, cotton fibers retain water at this time is 145%. Linters at 16-18% NaOH aqueous solution at room mercerized, washed sodium hydroxide and then with water, and without drying, the fibers can be restored to the original volume of the biological state of the water retention value of 115% -118 between%, so the conclusion is the water fountain Zhang relatively strong.

It is noteworthy that after the expansion of moist sodium carboxymethyl cellulose and dried by drying, the molecular chain and can be interrupted to re-open the hydrogen-bonded together, the water is turned off will also porous, which phenomenon is called keratinization effects, assuming the drying temperature is too high, the drying rate is too fast and then the reaction performance even worse than the feed water prior to the performance of the reaction of sodium carboxymethyl cellulose. When dry water retention is not 155%, 20 ℃ under drying of 106%, 105 ℃ drying was 77%, 150 ℃ under the dryer for 78%. Thus, the dry pulp is very important.

Pretreatment sodium carboxymethyl cellulose to understand these key factors.

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