The purpose of neutralization is to remove chlorine from Sb4O5Cl2 and convert it to Sb2O3. Generally, ammonia is used as a neutralizing agent:
Further, adding an appropriate amount in the same time with the agent and transformation agent, can greatly reduce the content of impurity elements such as iron oxide, lead antimony (≤0.001%), antimony oxide and a cubic crystal form transformed by the orthorhombic, greatly reduce The photosensitivity of Otaru is very beneficial for maintaining whiteness. In the neutralization process, the neutralization washing liquid is used to adjust the slurry, and it is neutralized under normal temperature conditions. The pH of the neutralization end point is about 7.5, and it is stable for 10 to 20 minutes. Then, filter and wash, medium-sized and above factories should use filter belts, filter belts should be equipped with filter section and washing section, small-scale factory vacuum pumping filter, washing with pure water, washing to the end point (more than 8 times) When using AgNO3, the wash solution was checked for no white precipitate.
The quality of high-purity yttrium oxide products directly prepared from brittle sulphide lead ore concentrate and sorghum lead anode slime is shown in the table below.
The main components and impurity element content of high-purity cerium oxide directly prepared by the new chlorination-hydrolysis method and AC method (%)
No. | Sb 2 O 3 | Pb | As | Fe | Cu | Bi | Se | S | Cl | Raw materials and methods |
2 | 99.83 | 0.0012 | 0.0098 | 0.0019 | 0.00069 | 0.0062 | 0.002 | 0.0013 | 0.013 | Brittle sulphur bismuth concentrate, New chlorination-hydrolysis |
3 | 99.91 | 0.0021 | 0.017 | 0.005 | 0.0029 | 0.0054 | 0.0023 | 0.0010 | 0.012 | |
4 | 99.81 | 0.0014 | 0.021 | 0.0005 | 0.00026 | 0.0052 | 0.0024 | 0.0010 | 0.016 | |
5 | 99.85 | 0.000 | 0.00017 | 0.0005 | 0.00001 | 0.000 | 0.000 | - | 0.011 | Sorghum lead anode slime, AC method |
7 | 99.85 | 0.000 | 0.0000 | 0.0006 | 0.000 | 0.000 | 0.000 | - | 0.0095 |
Note: The new chlorination-hydrolysis method does not take the arsenic removal method; the AC method is more than one new reduction solution of the new chlorination-hydrolysis method, and the pure SbCl3 is produced and then hydrolyzed.
Furniture edge sealing glue can be divided into three categories according to the different base materials:
EVA (ethylene-vinyl acetate copolymer resin) base material hot melt adhesive, this hot melt adhesive can be divided into two types with filler and without filler. Using EVA as the base material is the most common production technology for furniture edge sealing adhesives, and its main limitation is poor heat resistance. The ambient temperature of panel furniture sealed with EVA hot melt adhesive shall not be higher than 120°C;
POL YAMIDE (polyamide) based hot melt adhesive, this hot melt adhesive has good heat resistance and fast curing characteristics, the main disadvantage is that it is expensive.
HMPU (polyurethane) base material hot melt adhesive, it is a kind of hot melt adhesive with the best performance, and it is the guarantee of high quality sheet edge sealing. It is expensive and requires special usage.
The performance of furniture edge sealant
1. Viscosity of furniture edge sealant
The viscosity of furniture edge sealing glue does not directly reflect the performance of the glue. In general, the higher the viscosity of the furniture edge sealant, the better its initial tack strength, but the worse the coating performance. Low-viscosity hot melt adhesives have a smaller amount of glue and better wetting properties. Some hot melt adhesives with low viscosity and fast curing speed may also have high initial tack strength.
2. Density of furniture edge sealing glue
The density of furniture edge sealant is generally 0.95-1.6g/cm3, and its density depends on the amount of filler.
3. Softening point and use temperature of furniture edge sealing glue
The softening point is an indicator of the heat resistance of the furniture edge sealant. The higher the softening point, the less likely the furniture edge sealant will melt. At the same time, softening point is also an important aspect to measure the temperature resistance of panel furniture.
4. The opening time of the furniture edge banding glue and the feeding speed of the edge banding machine
Furniture edge sealant is widely used in the market because of its solvent-free, water-resistant, and environmental-friendly features.
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