General Evaluation Method of High Resilience Silicone Oil
High rebound sponge is ubiquitous in our lives, and silicone oil is an indispensable component of the sponge, it is used to regulate the pore structure, play the role of emulsification, nucleation, reduce surface tension, although the amount is small, but it is vital, how to professionally evaluate it, technical workers have their own methods, how to select a good product, I’ll share some of our evaluation of silicone oil experience.
I. Stability test of silicone oil
1.1 Storage stability test of silicone oil
Storage stability of silicone oil at low temperature
Inject the silicone oil into a 1L glass bottle and place it in the refrigerator for 24 hours to observe if there is any delamination of the silicone oil. If it is not obvious, take out the silicone oil and do a comparison test with the silicone oil at room temperature to see if the structure of the silicone oil’s closed holes and vesicles is normal, and if there is any abnormality, it means that this kind of silicone oil can not be stored at low temperature.
1.2 Storage Stability of Silicone Oil in Combination Materials
The new silicone oil and the original self-use of silicone oil with the same formula into a combination of polyether, under the same process conditions, foaming comparison of the expansion and vesicle situation, and then will be equipped with a combination of polyether were injected into a 1-liter glass bottle, placed in a 60-degree water bath, 6 hours after taking out the cooling, in the same kind of conditions, and then foaming, comparison of aging before and after the products of the expansion and vesicle situation, such as anomalies, it is shown that the If there is any abnormality, it means that the silicone oil is risky to be used as combination material.
Second, the activity of silicone oil evaluation
Process conditions: mold temperature of 60 degrees, material temperature of 25 degrees, the same demolding time. According to the approximate silicone oil activity given by the manufacturer, the silicone oil properties are determined by the degree of closure.
1. In the absence of equipment, the activity of silicone oil can be determined by the amount of pore opener.
2, can also be assisted by indentation hardness meter to determine the activity of silicone oil.
3, activity assessment period: the various factors affecting the degree of occlusion should be considered thoroughly to avoid interference.
Tolerance test of silicone oil
1, different systems, reduce the amount of silicone oil, test molding changes.
2, mold temperature adaptability test.
3, fluidity test.
4, the same degree of occlusion, compared with the product bubble structure, select the bubble more delicate silicone oil, in order to improve the processing tolerance of the actual molding production.
IV. Silicone oil VOC contribution test
1、Test method: VDA 278
2、When comparing with other silicone oils, use the same formula except silicone oil, make samples with the same process, and compare the test data with VDA 278.
V. Summary
The combination of material manufacturers to switch silicone oil is more cautious, but 3W silicone oil with excellent quality, more and more well-known combination of material manufacturers are familiar with the recognition, I think this and our strict testing methods are inseparable.
Translated with DeepL.com (free version)
