Poly(vinyl alcohol) binder for calcium carbonate pigment
A technology of polyvinyl alcohol and calcium carbonate, which is applied in pigmented coatings, paper coatings, fiber raw material processing, etc., can solve the problems of increased final viscosity, achieve low-shear viscosity reduction, easy handling, and excellent inkjet printing performance Effect
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Embodiment 1
[0037] Viscosity improvement effect
[0038] The viscosity modifying effect of low molecular weight, partially hydrolyzed fine particle size polyvinyl alcohol on fine particle size calcium carbonate slurries was measured. Using a high shear Dispersator type laboratory mixer, agitate the Jet Coat TM 30 Aliquots of precipitated calcium carbonate (500 g in a slurry containing 25-30% solids). Various amounts of Airvol(R) 203S polyvinyl alcohol powder were added to the stirred mixture at a rate of 1% per 10 seconds, wherein 99% of the powder particles had an average particle size of less than 180 [mu]m. Stirring of the mixture was continued for 15 minutes after the addition of Airvol(R) 203S. In a comparative example, 0.3 g of tetrasodium pyrophosphate (TSPP) dispersant was added to the calcium carbonate slurry. Brookfield viscosity was measured at 10, 20, 50 and 100 rpm. The measurement results are shown in Table 1.
[0039] JetCoat30 *
...
Embodiment 2
[0043] Adhesive effect
[0044] The effect of Airvol 203S as binder on fine calcium carbonate particles on paper was measured. Using tape, secure the uncoated base paper piece to the glass plate. The coating formulation is poured to the top width of the paper. A wire wound rod is placed on top of the paint and the length of paper is consumed by applying an even coating of paint formulation over the length of paper. The wet coated sheet was then dried in a forced air oven at 250°F for 2 minutes. Adhesion effectiveness (IGT pick strength) was measured using Tappi method T514pm-82, "Surface Strength of Coated Paperboard". Table 2 presents the results of measurements of IGT pickup strength.
[0045] JetCoat30 (none 10 parts A 20 parts A 0.3 parts
A 203S) 203S / 100 203S / 100 TSPP (dispersant)
IGT Pickup Strength No Bond 9 14 No Bond
[0046] * From VVP = Viscosity Velocity Product (kpoise-cm / s)
[0047] These data...
Embodiment 3
[0049] Printing performance
[0050] Paper coated with a combination of Jet Coat 30 and Airvol 203S polyvinyl alcohol was measured using a wire wound rod by applying the coating formulation to an uncoated base sheet and drying the coating at 250°F for 2 minutes. Inkjet printing performance. Coating weight is 8-10g / m 2 . Airvol 203S alone and 0.3 part of a mixture of TSPP and Jet Coat 30 were used as comparative examples. Coated papers were printed on a Hewlett Packard HP560 inkjet printer using a test protocol developed by Hewlett Packard. Optical density was measured using a Tobias IQ200 densitometer. The results are shown in Table 3.
[0051] table 3
[0052] base film A203S 10 parts 20 parts 0.3 parts TSPP
[0053] Composite black 0.57 0.75 0.94 0.96
[0054] Magenta 0.77 N / A 1.14 1.1 dusty
[0055] Yellow 0.61 N / A 0.85 0.83
[0056] Cyano 1.03 1.11 1.48 1.4
[0057] Single black 0.86 0.94 1.32 1.24
[005...
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Abstract
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