The Role Of 4A Zeolite in Detergent
4A zeolite synthesis raw materials can be divided into two categories: one is NaOH, Al(OH)3 or Al2(SO4)3, sodium silicate and other chemical raw materials, is the main raw materials of industrial synthesis at present; The other is natural aluminosilicate mineral raw materials, such as (coal measures) kaolin, (sodium base) bentonite, natural zeolite, alum, bauxite, high alumina cement, glass tuff, etc., which have begun to partially replace traditional chemical raw materials.
Beskrivning
The role of 4A zeolite in detergent
Products Description
The ion exchange of 4A zeolite is carried out with aluminum ions on the skeleton, and the negative charge of each aluminum ion can not only bind Na+, but also other cations. These cations (such as Ca2+) in the zeolite enter the large crystalline cavity formerly occupied by Na+ and replace the Na+ in the 4A molecular sieve.
The main factors affecting the ion exchange of 4A zeolite are particle size, temperature and pH value. The smaller the size of 4A zeolite is, the faster the exchange rate is, and the optimum size is 1μm ~ 10μm. When the temperature increased from 20℃ to 60℃, the ability of zeolite to exchange calcium ion increased, but not significantly. Alkalinity helps to improve the ability of 4A zeolite to exchange calcium ions. In neutral solution, the exchange capacity is 70% ~ 80%. When pH value is 9 ~ 11, more than 90% of the exchange capacity can be achieved. The ability of 4A zeolite to exchange magnesium ions is poor, because the diameter of hydrated magnesium ions is larger than that of 4A zeolite, and the ion exchange is difficult to carry out. When the sodium ions in 4A zeolite are exchanged by calcium ions 1/3, the number of cations is reduced, the location is empty, and the pore size becomes larger to about 0.5nm, then the removal ability of magnesium ions increases correspondingly, so 4A zeolite may remove 98% calcium ions and at least 50% magnesium ions. When sodium tripolyphosphate was partially replaced by zeolite hydrate, the residual amount of calcium reached below 1×10-6 after adding 4A zeolite for 10min. FIG. 1 compares the removal efficiency of Ca2+ and Mg2+ by 4A zeolite. Initial mass concentration: ρ(Ca2+)=80mg/L, ρ(Mg2+)=40mg/L(Ca2+ calculated by CaCO3, Mg2+ calculated by MgCO3); Zeolite mass fraction 0.06%; Temperature 40℃
It can carry more nonionic surfactants
The adsorption of zeolite to nonionic surfactants is 3 times that of NTA(subamino-triacetate) and sodium carbonate, and 5 times that of STPP and sodium sulfate. This property is of great significance for adding more surfactants into the adhesion forming laundry detergent to produce new products with good washing and flowing properties.
Synergistic effect
In detergents, the combination of different components often achieves better performance than any single component in the mixture. In addition to chelating heavy metal ions, 4A zeolite also has synergistic effects with surfactants like other electrolytes.
| Brand | Z-4A |
|
Ca exchange capability |
≥295（mg CaCO3/g） |
| Ca exchange rate: (2 minutes) | ≥175（mg CaCO3/g） |
| (10 minutes) | ≥190（mg CaCO3/g） |
| Particle size : D50 | 2-4um |
| D10 | ≥1um |
| D90 | ≤10um |
|
+325mesh |
≤2% |
| whiteness(W+Y10) | ≥96% |
| PH(1% solution,25℃) | ≤11 |
| L.O.I(800℃，1h) | ≤22% |
| Al3+（Dry basis） | ≥18% |
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