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 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.
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, in winter, the temperature is low, the foaming speed is slow, the bubble holes are easy to become thick, we suggest that the silicone oil should be added, 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, the silicone oil should also be appropriate to add more; low-density foam, the silicone oil should be added more, the high-density can be added less; large piece of the bubble, the silicone oil is added more, the small piece of the little bit less; the refrigerator material, the silicone oil amount of large appropriate a little bit of the insulation piping a little bit less; the cold room 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 up to 5% of the amount of polyether (plus polyester), 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 and polyester. Polyether, polyester, the last process to remove cyclopropyl, such as cyclopropyl off 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 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 stored for a long time, it is better to roll on the ground for a minute or two before use.
After opening the barrel, if it is not used up at one time, be sure to tighten the lid of the barrel after removing the material.
Silicone oil is a non-toxic, non-corrosive silicone surfactant, not a dangerous product. 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, it is best to bake and 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, alkali or organic tin, etc. on the silicone oil has a destructive effect, if the mixing of such substances with the apparatus, it is likely to make the whole barrel of silicone oil deterioration!
Silicone oil market current situation
Although there are no more than ten manufacturers producing silicone oil, the current market is quite chaotic. There is no uniform standard for quality. Polyether, blowing agent and other raw materials at least have some basic standards and testing methods, but silicone oil only each manufacturer’s own standards. There is no uniform standard, the quality is not uniform, the price changes are also very large. Cheap and polyether 4110 price may be about the same, expensive seventy or eighty dollars a kilogram there.
I can give you here, the price of hard foam silicone oil in 25 to 50 yuan / kg is more reasonable, because the cost is there, believe it or not it is there! How can real silicone oil as an additive be about the same price as 4110? The most basic silicone raw materials are more than 30 dollars, plus transportation, processing, silicone oil more or less have to make some money! Catalyst has 4110 price? Some people say that we use silicone oil is very cheap, very cheap silicone oil I advise you to think about why silicone oil can be so cheap, why?
We all do factories, when your customers say I use other combinations of materials than your company’s cheaper than 2,000 dollars, what will you think? You will certainly think that this combination of material inside are not all glycerin ah or castor oil ah or ……… Plus polyester can not be cheaper!!!!! Some people say I’ll use someone else’s cheap stuff and it’s fine anyway. But I still want you to use the cheap silicone oil when you add 0.5 parts silicone oil at 60 ℃ baked 5 days after foaming and more expensive silicone oil to compare the change of the bubble holes, and then determine whether there is a difference between these two silicone oil. Under normal circumstances, adding 2 silicone oil may not be a problem, but we must prevent accidents. Better silicone oil, the dosage can be reduced a little bit, for the combination of material factory benefit is the same. Some people say, I dare not add less, add less for fear of problems, then you add more cheap silicone oil you are sure to add more silicone oil, not necessarily!!!! Add less dare not, but you dare to add cheap silicone oil!!!!
Cheap vegetables, nine times out of ten is gutter oil fried; cheap rice is likely to be added plastic particles; cheap noodles may be added talcum powder. I don’t know whether you believe it or not, I do believe it!!!!
Synthesize the above:
1. Silicone oil in the combination of materials or foaming process is a key additives, with not much, the role is not small, no silicone oil is to collapse the bubble, silicone oil failure is also to collapse the bubble.
2. The quality and price of silicone oil is related, the price is worth every penny, you want to buy meat with the price of tofu, the possibility is very small, you are smart, others are not stupid.
3. The role of silicone oil: emulsification, nucleation, bubble stabilization, flow.
4. The choice of silicone oil, silicone oil in the procurement must indicate your purpose, silicone oil manufacturers can according to your requirements and the characteristics of their products to help you choose the right product.
5. Silicone oil test: silicone oil test is best used to reduce the amount of method of application experiments, which is more representative of the apparent physical properties of the index does not represent the actual role of silicone oil.
6. Silicone oil dosage: polyether + polyester 1.5-3.5%, our company’s silicone oil we generally recommend the dosage of 1.5 ~ 2.5%.
7. Combination of materials such as problems do not jump to conclusions, do not say it must be a silicone oil problem. To seriously analyze, I suggest that each engineer to develop good habits, each time the raw materials to come to the clean apparatus to seal the sample. So that even after the problem, you can take out the sealed samples to analyze one by one, otherwise find the problem but can not find the root cause, which is not anxious! Before you ship, your own products should also be done to observe the stability of the sample, customer complaints can also analyze the reasons.
