Detection of Phenyl-acrylic Waterborne Varnish Emulsion and Film-forming Properties

1 Appearance

Visually, milky white with light blue fluorescent translucent liquid.

2 solid content

Oven-drying method: Take about 2 g of emulsion and dry it in an oven at 120°C to a constant weight, weigh the mass of the emulsion polymer before and after drying, and calculate the solid content. Each sample was done in parallel in 2 groups, and the average value was taken.

s (solid content, %) = sample dry weight (g) / sample wet weight (g) x 100%

3 Viscosity

Adopt NDJ-1 Rotational Viscometer, constant temperature 25 ℃ , select the appropriate rotor to measure the emulsion viscosity.

4pH

The pH of the emulsion was measured with a PB-10 precision acidity meter.

5 Gloss

Spread it evenly on a red solid printing white board paper with a size of about 15 cmx5 cm , put it in a 120C constant temperature oven and bake for 3~5 minutes, remove the uneven part of the edge , take 3 points evenly on each paper and use a 60° mirror gloss meter Measure the glossiness of each point, and take the average value as the glossiness of the paper strip

Spend. For each sample, 4 groups were performed in parallel, and the average value was obtained.

6 Water resistance

Spread it evenly on a red solid-bottom printing whiteboard of about 15 cm x 5 cm , bake in a constant temperature oven at 120 °C for 3~5 minutes, remove the uneven parts on the edge, put it in a 50 °C constant temperature Water Bath, and record the panning of the film. White's first-time. For each sample, 4 groups were performed in parallel, and the average value was obtained.

7 wear resistance

Spread it evenly on a red solid-backed printing white board with a size of about 15 cmx5 cm , put it in a constant temperature oven at 120 ℃ for 3~5 minutes, remove the uneven part on the edge, rub it on a rubbing decolorizer, and record the first being damaged The number of times when the bottom of the paper is worn out. For each sample, 4 groups were performed in parallel, and the average value was obtained.