Use of aluminum phosphate, polyphosphate and metaphosphate particles in paper coating applications
An aluminum polyphosphate, aluminum phosphate technology, applied in coatings, paper coatings, pigmented coatings, etc., can solve problems such as expensive manufacturing costs, and achieve the effects of reduced waste and cost, fast drying rate on the machine, and high solid percentage
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Embodiment 1
[0199] Example 1: Comparison of Aluminum Phosphate Pigments and Plastic Pigments
[0200] Coatings were prepared according to Table 1. GCC (ground calcium carbonate), Hydrocarb 90 was dispersed at 72% solids with a high shear Cowles disperser. No. 1 clay pigment, Hydrafine, was dispersed at 70% solids. The aluminum phosphate pigment was dispersed with a high shear Cowles disperser at 34.2% solids. After the pigment is dispersed, the other coating ingredients are added in the order in Table 1 under gentle stirring with a stirrer. After all coating ingredients were combined, the solids content of the coating was adjusted with dilution water to achieve the same solids content as the target, Table 2. Coating solids and Brookfield viscosity were measured. Brookfield viscosity was measured using a #5 hydrometer at 100 RPM, 23°C, and is also listed in Table 2. The coatings were tested on a Hercules high shear rheometer with an E bob / 20.4sec ramp time.
[0201] Table 1. Coating ...
Embodiment 2
[0219] Example 2: Aluminum Phosphate Pigment and TiO 2 Pigment comparison
[0220] Coatings were prepared according to Table 7. Melaleuca clay was dispersed at 68.0% solids with a high shear Cowles disperser. Clay Pigment No. 2 was dispersed at 71.8% solids. While aluminum phosphate pigments and TiO with 34.2% solids and 62.4% solids, respectively 2 The slurry was redispersed with a high shear Cowles disperser just before use.
[0221] Table 7. Coating Formulations
[0222]
[0223] After dispersing the pigment, the other coating ingredients were added in the order of Table 8 under gentle stirring with a stirrer.
[0224] Table 8. Coating Composition
[0225] order of addition
coating ingredients
Product Specifications
Company Name
1
Melaleuca clay
NUClay
Engelhard Corporation
2
China clay No. 2
Hydrasperse 90
Huber Corporation
3
Titanium dioxide
Ti...
Embodiment 3
[0249] Example 3: Optical Brightener Study of Coated Fiberless Paper
[0250] Coatings were prepared according to the formulations given in Table 15 and the order of addition given in Table 16.
[0251] Table 15:
[0252]
[0253] Table 16: Order of addition
[0254]
[0255] GCC, Hydrocarb 90 was dispersed at 72% solids with a high shear Cowles disperser for 20 minutes. After 20 minutes of dispersion, dry FinnFix CMC was added to the GCC and the mixture was allowed to disperse for an additional 5 minutes. As the CMC thickened, the pH of Coating Clay No. 1, Hydrafme at 70% solids was adjusted to pH=8 with ammonium hydroxide. This serves to prevent pigment impact when GCC is added. The clay is then added to the GCC. After 5 minutes of dispersion, the thickened pigment slurry was then transferred to a mixer to which the SB emulsion was added.
[0256] As shown in Table 15, Formulation #1 was prepared without the aluminum phosphate pigment. In the next two recipes, 5...
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