Silicone oil test (at least two bubbles for each sample), I said the practical method:
Silicone oil test mainly test two aspects of performance:
Basic foaming application
Check the practical method of silicone oil is foaming, other methods are not too representative: choose a single polyether (only 4110), silicone oil plus 0.5 ~ 1%, foaming density of about 20kg, the speed of foaming control in the starting speed of 15 ~ 20S or so, the catalyst should not be selected too complex, only A-33 can be used. Comparison of foam pore structure and the length of the flow, which can be seen in different silicone oil effect differences. Each species should do two samples to repeat the comparison, the experimental results can be repeated to be meaningful.
Stability
Check the storage stability of silicone oil and combination of materials: with a good combination of materials, sealed up with a clean bottle, put into the oven at 60 ~ 70 ℃ for 48 hours, 96 hours, 120 hours were foamed, and no high-temperature storage combination of materials issued by the foam to compare, such as bubble hole changes are not large, then your combination of materials placed at room temperature for 3 ~ 5 months will not be a problem. If the foam significantly larger, or even the collapse of the bubble, that means you with the combination of materials must have a problem.
Of course, if you are the same manufacturer of the same grade of silicone oil used more than five batches, then you can also be provided by the silicone oil manufacturers to test the physical properties of the indicators can be silicone oil manufacturers are not so intermediate casually dare to substitute good for bad, unless you ask for a substantial reduction in price that is also difficult to say.
However, I hereby declare that our Dongjun chemical certainly will not have such a situation, if you ask for a price reduction, we accounted for such as price reduction space, we can drop, if not that can not be done. If you do get the same quality and price of silicone oil, it only means that we Dongjun have to work harder to provide you with better quality and cheaper products.
Dosage of Silicone Oil
In general, we recommend that the dosage of silicone oil should be 1.5~3.0% of the total amount of polyether+polyester. According to different seasons, different uses to make appropriate adjustments. You use the real 100% silicone oil plus 0.5 part will not collapse bubble, but the combination of materials generally do not match immediately after use. Especially in summer high temperature weather, in the process of storage there will always be some side reactions occur so that the combination of material quality decline, the higher the temperature reaction speed will be faster. Therefore, it is generally recommended to add silicone oil to 2% of polyether + polyester. Silicone oil proportion of more than 5% of polyether + polyester, we believe that there is no sense (unless you use the effective content of silicone oil is only 30 ~ 50%) silicone oil amount is too large to improve the performance of the combination of materials has not been too much, although the bubble hole a little bit of a slight change, but it will affect the bonding force and other properties of the real good silicone oil do not have to add too much! Some people have done a combination of material in the amount of silicone oil on the bubble density of the experiment.
