Low odor coating compositions and paints
A technology of composition and odor, applied in the direction of coatings, hydrolytic enzymes, etc., can solve problems such as coatings or paint properties, paint enzyme degradation, etc. that have not been discussed
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Embodiment 1
[0120] Embodiment 1 Determination of headspace VOC content based on ASTM D3960-05
[0121] Determination of IR in aqueous compositions based on ASTM 3960: Standard Practice for Determining Volatile Organic Compound (VOC) Content of Paints and Related Coatings Empty VOC content. This method uses static headspace sampling / GC-MS to determine the concentration of headspace compounds above waterborne emulsion polymers or waterborne paints at 33°C.
[0122] Preparation of standards: Calibration standards are prepared in a suitable solvent (eg THF) containing a minimum of three concentrations of each compound to be calibrated. Standard concentrations should be prepared by serial dilution and calculated in ppm on a weight / weight basis. The concentration of each compound in the lower and higher concentration standards should produce a detector response signal, and the response of the compound is used for sample analysis. 20 mg of each standard was weighed into 22 mL headspace vial...
Embodiment 2
[0124] Example 2. Determination of Enzyme Hydrolysis Activity
[0125] The procedure used to determine the enzyme activity of emulsion polymer latexes or latex paints is similar. For emulsion polymer latex, a 100 gram sample of emulsion polymer latex binder was treated with various enzyme concentrations ranging from 2.5 to 1000 ppm (weight of enzyme solids based on wet latex weight) of the different enzymes. After equilibrating for 1 day, samples were further treated with approximately 600 ppm ethyl acrylate (EA) and incubated in sealed jars at room temperature at pH = 8.5 for 48 hours. Five grams of samples were taken at intervals of 15 minutes, 75 minutes, 135 minutes, 1440 minutes, and 2880 minutes, diluted with 5 grams of deionized water, quenched with 100 ppm of 48% phosphoric acid to a pH of approximately 1.6, and mixed well. The catalytic activity of the free enzyme was then determined by calculating the change in headspace EA in the inhibited latex samples using GC / ...
Embodiment 3
[0126] Example 3: Synthesis of Emulsion Polymer Latex, Polymer A
[0127] A monomer emulsion was formed from the following components: 1397 grams of ethyl acrylate, 386 grams of methyl methacrylate (with < Deionized water and 51.8 grams of anionic surfactant (30% active), emulsified under agitation. Into a 4 liter multi-neck flask equipped with mechanical stirring was added 9 grams of anionic surfactant (30% active) and 547 grams of deionized water. The contents of the flask were heated to 75°C under nitrogen. 67 grams of monomer emulsion were added to the stirred flask contents, followed by 0.02 grams of ferrous sulfate heptahydrate dissolved in 23.5 grams of deionized water and 0.02 grams of EDTA tetrasodium salt and sodium carbonate (based on the total amount of monomers) less than 0.5% on a benchmark basis). Polymerization was initiated by adding 1.2 grams of sodium persulfate dissolved in 36 grams of deionized water, followed by 0.6 grams of sodium bisulfite dissolve...
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