Improvement of foam fluidity, density distribution
We say that silicone oil is a surfactant that can reduce the surface tension of the system, as shown below
Reducing the surface tension is conducive to improving the wettability of the foam body to the substrate mold, thus improving the fluidity and density distribution and reducing the dark foam. Below is a comparison of the flow of two groups of surfactant-added and non-surfactant-added liquids.
Classification of silicone fluids
The classification of silicone oil is still based on its characteristics to be classified, generally divided into three categories: First, the nucleation ability of silicone oil; Second, emulsification ability of silicone oil; Third, good fluidity of silicone oil. There are many other applications of classification, such as according to the foaming agent to classify: F-11 system, 141B system, cyclopentane system, all-water system; according to the use of classification: home appliances, panels, spraying and so on. This classification is a lot, but the essence is also based on the structure of the silicone oil itself endowed with its characteristics, we usually say that different foaming agent selection of different silicone oils, different uses selection of different silicone oils, in the final analysis is still based on the requirements of the above three aspects and different.
Silicone oil basic performance classification
For example: 1, we say that cyclopentane system selection of silicone oil is different from the 141B system, why? A very important reason is that cyclopentane and conventional polyether system of poor compatibility. Then, to make the combination of material system stability you either choose a special polyether, or choose emulsification ability of silicone oil.
2, some people say that our combination of materials do not have a high rate of others out of the party, that is because of your combination of material mobility, starting speed is not good enough, you choose the silicone oil and mobility is very poor silicone oil, out of the party rate how can be high?
Selection of silicone oil
So we all in the actual application, how to choose the right silicone oil? Based on the above triangle diagram, see what you need, what is required, what kind of results you want:
1, if you require a particularly fine bubble holes, closed cell rate to be particularly high, then you choose to favor the role of nucleation ability of strong silicone oil, such as our company’s H-3625, H-350, H-3625A;.
2, if you use a particularly large amount of foaming agent, but also added a considerable amount of polyester, then you have to choose the emulsification ability of the silicone oil, such as our company’s H-3609, H-3618, H-3606, H-693, etc.;.
3, if you want to send out a high rate of square or large pieces of mold foam silicone oil, then you choose good fluidity silicone oil, such as our company’s H-3612, H-3625B.
4, if you want a better overall performance: do refrigerator material, with cyclopentane as a foaming agent, not only the requirement of the bubble hole also requires emulsification capacity, fluidity can not be too poor, then you choose the
Different silicone oils have different characteristics, and different silicone oils have different emphasis. You have to choose the suitable silicone oil for your system according to your raw materials and different applications. The main function of the silicone oil direction is determined, and then according to the actual application needs, select the appropriate performance of the product, each main direction of the silicone oil have a series of fine-tuned products for users to choose to meet different needs. I think the choice of silicone oil is the same as finding a partner, there is no best, only the most suitable. You can’t ask for a silicone oil that has the best emulsification, the best fluidity, and the finest pores. To be honest, it is still hard to find such a silicone oil. You have to be clear about your needs before you can find the right product.
