4A Zeolite Molecular Sieve Related Knowledge Analysis

Zeolite molecular sieves are a synthetic, aluminosilicate with a microporous cubic lattice. According to the size of the pores inside the crystal, molecules that adsorb or repel different substances are called "zeolite molecular sieves". A substance having a molecular diameter smaller than the pore diameter of the zeolite molecular sieve crystal can enter the zeolite molecular sieve crystal and thus be adsorbed, otherwise it is repelled. The performance of zeolite molecular sieves is as follows:
 
    1. Ion exchange performance ---- softening water quality function: Each oxygen atom in the 4A zeolite molecular sieve framework is shared by two adjacent tetrahedra. This structure forms large crystals that can be occupied by cations and water molecules. Acupuncture points, and these cations and water molecules have greater mobility, can perform cation exchange and reversible dehydration. The ion exchange of 4A zeolite molecular sieves is carried out on a framework with aluminum ions. A negative charge carried by each aluminum ion can bind not only sodium ions but also other cations. Calcium and magnesium ions can enter the large cavities occupied by the original sodium ions, replacing the sodium ions in the 4A zeolite molecular sieve - that is, the sodium ions in the 4A zeolite molecular sieve can be ion exchanged, and can be combined with Ca2+ in hard water. Mg2+ ions are exchanged to achieve the purpose of softening water quality. The
    4A Zeolite molecular sieves bind calcium and magnesium ions at a slower rate than sodium tripolyphosphate and have weaker binding ability to magnesium ions. However, the 4A zeolite molecular sieve can remove a small amount of harmful heavy metal ions (such as Pb2+, Cd2+, Hg2+) easily and quickly in the aqueous solution, which is of great significance for purifying water quality. The

    2. Adsorption of Surfactants - Carrier Fluid Function: Due to the pore structure of 4A zeolite molecular sieve crystals and the large specific surface area of the particles, the adsorption performance of the 4A zeolite molecular sieve is very strong. The
    The adsorption of non-ionic surfactants, 4A zeolite molecular sieve is 3 times NTA (nitrilotriacetate) and sodium carbonate, is 5 times of sodium tripolyphosphate (STPP) and sodium sulfate, this property is in the agglomeration The formation of high-concentration laundry detergents is formulated with more surfactants, making it very meaningful to produce products with good washing and flow properties. Through experiments, the liquid carrying capacity of 4A zeolite molecular sieve is ≥ 30%. Adding 4A zeolite molecular sieve during detergent production process can increase the flowability of the material, adjust the viscosity, and obtain products with good appearance, flowability and anti-caking ability. . The
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    3. Detergency: Through the experiment, the same formula with different additives was used to change the decontamination ability of the additives and found that 20% of STPP, 20% of zeolite molecular sieve, 4% of polymer decontamination effect and 40% of STPP Similarly, 10% of sodium carbonate and 4,5% of polymer are added to 20% of the zeolite molecular sieves in the non-phosphorus formulation to give a very satisfactory detergency. The
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    4, anti-redeposition: 4A zeolite molecular sieve has a good oil adhesion, when sodium carbonate, CMC, sodium silicate and sodium sulfate and other additives added to the zeolite, the nylon cloth significantly reduced the adsorption of oil pollution. When the particle size of the zeolite is 0, 4-1, and 0 μm, the dispersibility is relatively good, and the adhesion to the fabric can be prevented. The
Although the dispersibility of 4A zeolite molecular sieves is not as good as that of STPP, the problem of dispersion of the dirt can be solved by compounding sodium polyacrylate. The

    5. Compatibility with other additives: 4A Zeolite molecular sieves and other additives can complement each other's performance. 4A zeolite molecular sieves are not as good as STPP in dispersibility of dirt and hardness ions, but 4A zeolite molecular sieve is mixed with STPP. Detergency can achieve the effect of using STPP alone. This is because STPP can rapidly complex calcium and magnesium ions from the solid surface and pass it through an aqueous medium to the 4A zeolite molecular sieve. The 4A zeolite molecular sieves have poor ability to bind to magnesium ions and can be compensated by compounding silicates and carbonates in zeolite molecular sieves. The

    6, PH buffering effect: 4A zeolite molecular sieve is alkaline, 1% of the aqueous solution PH at 11,0, so it has a certain buffer alkalinity.
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    7. Safety: 4A zeolite molecular sieve is non-toxic and highly safe to the human body. No irritation to the eyes and skin, will not cause allergies, use safe and reliable. It is deposited in the soil after washing, does not cause pollution, and can also improve the soil. The 4A zeolite molecular sieve has no adverse effects on ecology.