Commitment to knowledge and research is in Concentrol’s DNA. From our four divisions, Performance Materials, Food Processing Aids, Additives and Adhesives, we present the best solutions after a rigorous process of development and verification of the effectiveness and quality of each of the products.

This study compares the antifoaming capacity and the deaeration capacity of some antifoaming products on the market with our solutions EMULTROL DFM AFO-5, EMULTROL DFM OLV-24, EMULTROL DFM AFO-24 and EMULTROL DFM AFO-1.

To evaluate and compare the short and long-term performance of the different antifoaming agents, a stirring method has been carried out, directly after the addition of the antifoaming agent and also after an aging process.

The different antifoaming agents, their composition and their solid content are shown in Table 1. This information has been used to adjust the dosage of the antifoaming agent in the tests in order to always compare the antifoaming agents with the same solid content.

 

Table 1. The commercial name, chemical grade or class and the solid content of the different antifoaming agents used in this study are shown.

Antifoaming agentTypeSolid content (%)
Product 1Mineral oil emulsion28
Product 2Vegetable oil emulsion30
Product 3Vegetable oil100
EMULTROL DFM AFO-1Mineral oil emulsion50
EMULTROL DFM AFO-5Vegetable oil emulsion22
EMULTROL DFM OLV-24Esterified vegetable oil100
EMULTROL DFM AFO-24Esterified vegetable oil emulsion50

 

Methodology

The entire test was carried out on a styrene-acrylic copolymer dispersion. To perform the antifoaming tests, 200 mL of the acrylic styrene dispersion were measured with a dose of 0.2-0.45% of the antifoaming agent, depending on the solid content of the antifoam, except vacuum.

The mixtures have been stirred at 1300 rpm for 5 minutes. Finally, the density of the sample has been measured to determine the percentage of occluded air. Subsequently, the same antifoaming test was repeated with a sample aged by preserving at 45 °C for 7 days.

 

Results

Table 2. The different doses, the results of both fresh and aged antifoaming tests incorporated into the air are shown. As can be seen, the doses of the different antifoaming agents have been adjusted to have 0.1% of total solid content, except for the last two which both have 0.2% solid content.

Antifoaming agentDose (%)% Trapped air (Fresh)% Trapped air (Aged)
Control03944
Product 10,373953
EMULTROL DFM AFO-10,22635
Product 20,333544
EMULTROL DFM AFO-50,453545
EMULTROL DFM AFO-240,21724
Product 30,21122
EMULTROL DFM OLV-240,21117

Comparative study between antifoaming agents on the market and Concentrol antifoaming agents based on vegetable and mineral oils in styrene-acrylic dispersion

Graph 1. The graph shows the entrapped air of the different antifoaming agents, which corresponds to the entrapped air present immediately after stirring, and the aged air, which corresponds to the entrapped air present after the aging of the dispersion.

 

Conclusions

First, comparing mineral oil emulsions, EMULTROL DFM AFO-1 showed better performance in both short and long-term effect compared to the market benchmark (sample 1), which did not show any effect or even had more trapped air than the control test.

Regarding vegetable oil emulsions, EMULTROL DFM AFO-24 has a better deaeration effect than the market reference and EMULTROL DFM AFO-5.

Finally, if we compare the effectiveness of vegetable oil based products, EMULTROL DFM OLV-24 shows better long-term deaeration performance compared to the competitor’s product.

For over 75 years, at Concentrol we have worked with a team of expert technicians who help us design and produce the best value for money solutions. Thanks to this important work in our laboratories, we can produce products that meet the needs of our customers and reach more than 82 countries and 5 continents.

 

Author: Lorenzo Rico, Technical Manager of Concentrol.