Performance evaluation of paper coating deblisters.

Paper coating debugging agent performance evaluation
Liu Deming (Anhui Wei Chemical Technology Development Co., Ltd., Maanshan City Desiccant Engineering and Technology Research Center, Anhui Maanshan 243000)Paper coating is an important part of coating processing paper, paper coating on paper and cardboard can improve its appearance and printing performance. In the production of paper coatings, a large amount of foam is produced due to the addition of pigments, chemical additives and other additives. We have been committed to controlling the production of these foams affecting production, in addition to the preparation process to add the appropriate amount of defrosting agents, we also advocate early control of foam production, that is, in the production of paper coatings or filling processes to add defrosting agents, in order to control the foam of paper coatings.1 Laboratory evaluation of defoaming agents
1.1 foaming medium preparation
instruments: plug drum (200ml), stopwatch;
reagents: pyrethropolic polyoxyethylene (10) ether: industrial grade; sodium diane sulphate: industrial grade, 30% effective content.
in accordance with the steps of the reference to the preparation of experimental foaming medium (or foaming liquid): said to take about 5 g (accurate to 0.0 01g) pyrethroids polyoxyethylene (10) ether (industrial grade) and about 5 g (precise to 0.0 01g) sodium duobenzene (industrial grade, effective content 30%) dissolved in 990m l water, mixed to a uniform transparent liquid.
1.2 deboist deboulation performance test
desmoulation performance test in accordance with the steps of the reference, equipment plug volume (50 x 0.5) m l experimental foaming medium, constant temperature to 2 5 degrees C, add about 0.2 g (accurate to 0 .0 01g) defrosting agent, cap the plug, with the frequency of 2 times / s, (30 to 35) c m swing up and down the momentum cylinder 10 times, 10 0 times, sit still and use a stopwatch to start the timing, record the foam to the liquid surface of the time used, in s. The shorter the time it takes, the better. Detailed results of deblistering performance (de-foaming time) can be found in Table 1.
Table 1 desmoulant X P -5 0 2C (mineral oil and polyether) and X P-014B (mineral oil and a small amount of silicone) are our company's products;
can be found from the experimental data in Table 1, combined with the experimental data of 10 and 10 0 times, the debobble chronological order of the four debobble agents is: X P-502C X P-014B. The result of deboulation performance of the deboulant is: X P-502C is better than X P-014B, X P-014B is better than external sample A, and external sample A is better than external sample B.
1.3 anti-foaming performance test
anti-foaming performance test of anti-foaming agent in accordance with the steps of the reference, the amount of 100m l experimental foaming medium, open lubricant (defrosting agent) foam characteristics The flow pump of the meter (which should meet the requirements of C B/T 12579) begins testing to record the foam volume (m l) of 30m i n of the air drum, with the foam volume of the air drum 30m i n to indicate the result of the foam suppression performance. The smaller the foam, the better. The results of anti-foaming performance can be found in Table 2.
defystant in table 2 is the same as table 1. The experimental data from Table 2 show that the foam volume produced by the four defrosting agents is ordered as: X P-502C X P-014B X-014B external sample A external sample B, so the result of the anti-foaming agent is: X P-502C is better than X P-014B, X P-014B is better than external sample A, external sample A is better than external sample B.2 Simulated field testing
In order to better evaluate the performance of desiccants, the relevant performance tests of desiccants are carried out closer to actual production by laboratory simulation preparation of paper coatings in a paint factory.
2.1 Preparation of coatings for test
paper coatings required for testing in accordance with the reference formula in Table 3.
2.2 desiccant compatible test
in 10 0g test coatings, 0.2g X P-502C, X P-014B, exterior A, external Sample B, with a 75 m wet film preparer on the glass coating, to evaluate the compatible of the deblister, coating film gloss, etc. , if the coating film is more flat and the number of pinholes is less, to prove that the better the compatible of the desiccant. On the other hand, it is proved that the less compatible the deboulant is. See Table 4 for detailed results.
in table 4 is the same as table 1. As can be found from the experimental data in Table 4, the compatible results of desmoulation agent are: X P-5 0 2C is better than X P-014B, XP-014B is better than external sample A, outer sample A is better than external sample B.2.3 de-foaming performance and storage stability test of de-foaming agent
production of paper paint will have foam production, after adding de-foaming agent foam will be reduced, so the density of the coating will become larger, if the density becomes larger, the better the de-foaming performance of de-foaming agent, on the other, the worse the de-foaming performance of de-foaming agent.
after a period of time of static storage of the foaming medium added to the defrosting agent, the performance effect of the defrosting agent will have a certain degree of attenuation, so the foam inside the foaming medium will increase, resulting in a smaller density, while the liquid surface will appear. If the density becomes smaller and the more precreates, the storage stability of the desmoulizer is worse, and on the other possible, the better the storage stability of the desiccant.
the 20 0 g test coating and temperature to 2 5 degrees C, the density is tested with a density meter as the base density, and in the 200g test coating, 0.3g X P-502C, X P-014B, Sample A, external sample B, and its constant temperature to 25 degrees C, at this time, the density meter is used to test its density, the density as the initial density, and then its constant temperature (25 degrees C) static storage for 30 days, respectively, to test its density is post-storage density, and observe the paper coating liquid surface of the number of prediste. See Table 5 for detailed results.desostage agent in Table 5 is the same as Table 1. As can be found from the experimental data in Table 5, the data order of the initial density is X P-502C, X P-014B, X-014B, and therefore the result of the de-foaming performance of the desmoulation agent is: X P-502C is better than X P-014B, X P-014B is better than the external Sample A, the outer sample A is better than the external sample B, the data order of the post-storage density is X P-50 2C-X P-014B, the order of the pre-estrucion is: X P-502C- X P-014B external sample A. Therefore, the results of deboulant storage stability are: X P-502C is better than X P-014B, X P-014B is better than external sample A, external sample A is better than external sample B.3 Conclusion
Through the relevant experiments mentioned above, the properties of desiccant can be evaluated and judged from different aspects, and the experimental results obtained are consistent with the effect of the actual application of the product. Therefore, the above test methods for the paper coating industry desiccant selection and selection to provide reliable data and guidance, has been widely praised by users..