Preparation method of high-transparency low-oil-absorption-number matting powder
A technology of matting powder and oil absorption value, applied in chemical instruments and methods, dyeing low molecular organic compound treatment, dyeing high molecular organic compound treatment and other directions, can solve the problems of poor matting effect, high oil absorption value, poor dispersibility, etc. Effects of increased density, gloss and transparency, good suspension properties
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Embodiment 1
[0020] Add 3000kg of water glass into the reaction kettle, start stirring, start adding hydrofluoric acid, stop adding acid after the gel is formed, immediately raise the temperature to 48°C, add acid again to adjust the pH value to 4, and stir for 60 minutes.
[0021] 500 kg of polytetrafluoroethylene wax emulsion was added thereto, 40 kg of silane and aluminate were added to carry out surface modification, and the reaction was carried out for 65 minutes.
[0022] Raise the temperature to 58°C, add 50kg of water-soluble acrylic acid grafted with siloxane, and at the same time add 50kg of ethanol, and keep it warm for 1.5 hours to make it second coating.
[0023] Wash the slurry with water and press filter to reduce the conductivity to below 300μs / cm. Spray dried and then pulverized to a particle size of 4 μm.
Embodiment 2
[0025] Add 3000kg of water glass into the reaction kettle, start stirring, start adding phosphoric acid, stop adding acid after the gel is formed, immediately raise the temperature to 52°C, add acid again to adjust the pH value to 5, and stir for 60 minutes.
[0026] Add 400kg of fluorine-containing silane coupling agent therein, add 50kg each of polyethylene wax emulsion and titanate to carry out surface modification, and react for 90 minutes.
[0027] Raise the temperature to 84°C, add 35kg of linear siloxane, and add 70kg of ethanol at the same time, and react for 2.5 hours to make it secondly coated.
[0028] Wash the slurry with water and press filter to reduce the conductivity to below 300μs / cm. Spray dried and then pulverized to a particle size of 6 μm.
Embodiment 3
[0030] Add 3000kg of water glass into the reaction kettle, start stirring, start adding sulfuric acid, stop adding acid after the gel is formed, immediately raise the temperature to 50°C, add acid again to adjust the pH value to 4.5, and stir for 60 minutes.
[0031] Add 1000 kg of fluorine-containing cyclic silane therein, add 25 kg each of silane and titanate to carry out surface modification, and react for 1 hour.
[0032] Raise the temperature to 68°C, add 30kg of water-soluble polyurethane grafted with siloxane, 40kg of linear siloxane, and at the same time add 50kg of ethanol, and react for 2 hours to make it second coating.
[0033] Wash the slurry with water and press filter to reduce the conductivity to below 300μs / cm. Spray dried and then pulverized to a particle size of 5 μm.
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