Subcritically formulated coatings
A particle and shape technology, applied in the field of architectural paint, can solve the problem of insufficient water vapor permeability of the paint film
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Embodiment 1
[0055] Embodiment 1: the preparation of seed latex
[0056] A monomer emulsion was prepared by weighing 450 g of methyl methacrylate, 5.38 g of Disponil SUS IC 875 (an emulsifier based on diisooctyl sulfosuccinate) and 193 g of deionized water in an Erlenmeyer flask . The mixture was stirred vigorously for 1 minute and after a 5 minute standing time for an additional 10 minutes until complete emulsion formation.
[0057] A 1-liter reactor was pre-charged with 4.22 g of Disponil SUS IC875 and 360 g of deionized water, and stirred at 150 rpm and N 2 This initial charge was heated to an internal temperature of 74°C while passing over. After reaching the reaction temperature, 51 grams of this emulsion was quickly pumped into the Quickfit flask. The initiators were then added—2.1 ml of a 10% strength aqueous solution of sodium peroxodisulfate and 2.0 ml of a 10% strength aqueous solution of sodium bisulfite.
[0058] This was followed immediately by an increase in temperature, ...
Embodiment 2
[0059] Embodiment 2: the preparation of hollow bead dispersion
[0060] For the first reaction stage, a monomer mixture consisting of 35.3 g of methyl methacrylate, 25.5 g of methacrylic acid and 3.2 g of n-butyl acrylate was prepared. For the second reaction stage, an emulsion was prepared from the following components: 161.15 grams of methyl methacrylate (MMA), 161.15 grams of ethylhexyl acrylate (EHA), 13.44 grams of divinylbenzene, 20.00 grams of Disponil at a strength of 15% by weight SDS (sodium dodecyl sulfate based emulsifier) in water, 128.2 grams of deionized water and 0.26 grams of sodium peroxodisulfate. The mixture was stirred vigorously for 1 minute, followed by a rest period of 5 minutes for an additional 10 minutes until an emulsion formed.
[0061] 25.7 g of the seed latex according to Example 1, 0.51 g of a 15% strength by weight solution of Disponil SDS in water and 456 g of deionized water were precharged in a 1 liter flask and heated to 84-85° C. with s...
Embodiment 3
[0063] A subcritical (meth)acrylate dispersion based on Mowilith 7714 (from Celanese company) was formulated. The mahlgut (initial stage 1) was prepared by pre-filling the container with water and adding all other ingredients (see Table 1) with stirring. The stirring assembly used was a dissolver with toothed discs.
[0064] Table 1: Millbase (Initial Stage 1) Recipe
[0065]
[0066] This is followed by a paint letdown.
[0067] Table 2:
[0068]
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Abstract
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