Effective use of dispersants in wallboard containing foam
A technology of dispersant and foam, applied in the field of effective use of dispersant in foam-containing wallboard, can solve problems such as difficult mixing into slurry, and achieve the effect of high production flexibility
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example 1
[0078] The liquid polycarboxylate dispersant was partitioned between foam water and metered water. As indicated in Table 1, a total of 14 grams of liquid dispersant was added. The dispersant is 40% solids and 60% water. Dry CSA accelerator was added to the stucco at a rate of 0.20% based on the dry stucco. Foam was made with 1% PFM soap added to water and the amount of liquid dispersant shown in Table 1. Taking into account the water present in the dispersant, a total of 148 grams of water was used to make the foam.
[0079] According to Table 1, the liquid dispersant was added to a measure of water to obtain a total of 852 grams of water. Stucco is added to the liquid and blended to make a homogeneous slurry. Add foam to the slurry. The resulting slurries were tested and the results of the tests are shown in Table I.
[0080] Table 1
[0081] Dispersant split
100 / 0
85 / 15
74 / 26
65 / 35
in the mixer
PCE
14.0
11.9...
example 2
[0085] In industrial trials, two different dispersants were added to the mixer and / or foam water. The plant operates at 1795 lbs (7989 kg) per MSF plate. Both wet gypsum accelerator and HRA were added in the amounts shown in Tables IIA and IIB to maintain 50% set when the cutter cuts. Tables IIA and IIB also show the type and amount of dispersant added, as well as the slump and observations regarding air bubble distribution. The amounts of dispersant reported in Table II are based on the dry weight of the stucco. The solidification accelerator is measured in lbs / MSF (g / m 2 )Record.
[0086] Table IIA
[0087] sample
[0088] Table IIB
[0089] sample
[0090] In this industrial trial, two different dispersant types were used in a mixer and in foam water, and the manufactured boards were cut to examine the size of the air bubbles in the core. Samples L and M used only the polycarboxylate dispersant in the mixer. Such as figure 2 As shown, the formed...
example 3
[0092] The effect of dispersant split between mixer and foam water will be further investigated in plant trials. Liquid polycarboxylate dispersant MELFLUX 2500L ("2500L") was added to the mixer or foam water as described in Table III. The amount of dispersant is recorded on a solid basis and the amount of water included in the liquid dispersant is taken into account when calculating the total amount of water present in the slurry. Stucco was utilized at a rate of 1235 lbs / MSF. The amount and placement of the dispersant as well as the water added, the total amount of accelerator used and the product slump are shown in Table III.
[0093] Table III
[0094] Sample ID
[0095] Comparing these trials can determine the increase in flow when the same dispersant is split between the mixer and the foam water, even when the total amount of dispersant is substantially the same. Even when the basis water was reduced by 36 lbs / MSF, there was still an increase in cake size in ...
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