Dosage of silicone oil
In general, we recommend that the amount of silicone oil should be 1.5-3.0% of the total amount of polyether + polyester. According to different seasons, different uses should be adjusted appropriately. You use the real 100% silicone oil plus 0.5 parts will not collapse foam, 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 to make the combination of material quality decline, the higher the temperature the faster the reaction speed. 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, the results are shown below:
Silicone oil dosage on the bubble structure
Silicone oil dosage according to the actual situation, different regions, different climates, different seasons, different uses have different empirical data. For example, winter temperatures are lower, the foaming speed is slow, the bubble holes are easily coarsened, we recommend that more silicone oil to add, the summer is hotter can be appropriate to add less; hair flame retardant foam, due to the flame retardant is easy to cause the broken bubble, silicone oil should also be appropriate to add more; low-density foam, silicone oil should be added more, high-density can be added less; a large piece of foam, silicone oil to add more, a small piece of the small piece of the small add a little more; refrigerator material, the amount of silicone oil is large appropriate a little bit of insulation piping to add a little bit less; cold storage Spraying silicone oil content to be higher, if the roof spraying a little less; with good quality polyether (such as high bridge), polyester silicone oil less added a little less problem, if the use of cheaper than the market price of 20% of the polyether, polyester, but also with the underground factory F-11, silicone oil, even if it is again, can not guarantee that no problem, not to mention less added. We generally believe that: silicone oil does not exceed the amount of polyether (plus polyester) 5%, not less than 1%. Different foaming engineers have a set of their own experience data, which need to be summarized and summarized in the work.
Silicone oil in the use of the problems that tend to occur
Turbidity: When the weather is particularly cold or hot, some silicone oil will become turbid, which is not necessarily a problem with the quality of silicone oil, you can ask the manufacturer what the reason is, generally in the specific temperature range of the silicone oil it will not become muddy. At room temperature, the silicone oil becomes clear and does not stratify after shaking well, indicating that there is no problem with the silicone oil, if it can not become transparent is likely that the silicone oil has been deteriorated.
Silicone oil failure: the structure of the silicone oil is relatively stable, in the shelf life of the general will not fail. Such as failure, not necessarily the silicone oil itself out of the situation, there may be problems in the external environment, thus destroying the silicone oil, so that the silicone oil failure, common problems are the following aspects:
① High cyclopropyl value in polyether, polyester. Polyether, polyester and then a process to remove cyclopropyl, such as cyclopropyl removal is not clean, cyclopropyl will make the silicone oil chain breakage, thus making the silicone oil failure.
② F11, 141b acidity is too strong. As F11, 141b acidic and the presence of small molecules, may destroy the silicone oil.
③ Motor oil. If your equipment leaks oil, so that the oil enters into the combination material system, it will also destroy the silicone oil, thus causing large holes or even collapsed bubbles.
④ Polyester, organotin. Polyester with organotin as a catalyst or organotin as a foaming catalyst can also disable silicone oil, thus causing large pores and even collapsed bubbles
Delamination and odor. Silicone oil stored for a long time in an inappropriate environment or other impurities contaminated silicone oil will decompose, stratification and become smelly, such silicone oil has a bubble-breaking effect, can not be used.
Storage and transportation of silicone oil, use
Silicone oil should be stored in a dry and cool environment.
If it is stored for a long time, roll it on the ground for a minute or two before use.
After opening the barrel, if you can’t use it all at once, make sure to tighten the lid of the barrel after taking the material.
Silicone oil is a non-toxic, non-corrosive silicone surfactant and is not a hazardous material. Most varieties of silicone oil soluble in water, some special varieties may not be easily soluble in water, will be soluble in alcohols; if sticky to the skin without too much tension, wash with water can be splashed in the eyes, rinse with water to see a doctor; silicone oil can not be food to fill up the hunger, accidental ingestion or to wash the stomach;
Winter is too cold, some varieties of silicone oil will be cloudy, and even lumps, baking heat to room temperature, rolling evenly after use.
Shelf life of silicone oil: reasonable preservation of not less than one year. Long-term storage of silicone oil, if the physical properties of normal indicators, qualified test can also be used, my company more than five years of silicone oil by the test does not affect the use.
Take a small amount of silicone oil must be clean with special equipment. Strong acid, strong alkali or organic tin, etc. have a destructive effect on the silicone oil.
