Research progress of polyurethane prepolymer
Since the release of the new national standard GB36246-2018, after two years of practice, more and more companies have realized that TVOC (total volatile organic compounds) is an important roadblock to testing through the new national standard. But many companies do not understand why TVOC does not meet the standard, because the test only shows the results of compliance or non-compliance, there is no data to tell enterprises exactly what causes the non-compliance, many companies are very confused, and even think that such a harsh standard most manufacturers should be the same as their own may not meet the standard, the mind is lucky.
R&D history
Since the beginning of the new national standard of plastic runway, URS has already researched and judged that TVOC must be the death of the current catalyst, and quickly started the research and development work, the product has been improved by CUCAT-V01, V02 …… many times until today’s CUCAT-V17, V18 (hereinafter referred to as V17, V18), now V17 and V18 have been more and more pursuing high quality. V17 and V18 have been used by more and more manufacturers pursuing high quality plastic runway materials, and the practice of using V17/V18 environmental protection plastic runway all over the country fully verifies the fact that the TVOC national standard of less than 5mg/m2-h can be achieved!
01
Common Questions
Why can the plastic runway with V17 and V18 meet the TVOC requirements of the new national standard?
Why not use V17, V18 and ordinary bismuth zinc catalyst can not pass TVOC?
What are the substances that cause the TVOC test to exceed the standard?
The following is the answer to the above questions by URS.
Most of the plastic runway material manufacturers believe that TVOC is mainly caused by solvents, the catalyst will not have an impact on such a small amount. —— fact is just the opposite! The qualitative and quantitative data show that most of the causes of TVOC exceed the standard are not solvents, because many enterprises basically do not add solvents, even if they use solvents, a small amount of solvent boiling point is very low, easy to volatilize, almost no residue —— qualitative and quantitative results show that the largest amount of substances contributing to TVOC are new decanoic acid/isooctanoic acid and Alkanes below C15, these two types of substances are the result of the drying agent bismuth zinc neodecanoate, bismuth zinc isooctanoate and plasticizers. Even if the addition amount of bismuth zinc iso-octanoate/neodecanoic acid is only 0.1%, the TVOC value contributed by iso-octanoic acid and neodecanoic acid is more than 5mg/m2-h or even higher!
02
Experimental data
In order to more intuitively illustrate the contribution of catalysts to TVOC, we put V17, V18 and isooctanoic acid / bismuth zinc neodecanoate catalysts in accordance with the new national standard directly do a small environmental warehouse TVOC test, is able to meet the national standard requirements! The data are as follows.
See the above table data, you are not a little surprised, how now with the bismuth zinc TVOC so high?
Yes, You Run tells you that the above data is still the isooctanoic acid/neodecanoic acid bismuth zinc after removing the free isooctanoic acid/neodecanoic acid! Before no test data appeared, many engineers do not believe ——- is very simple, the bismuth zinc you now use to do a small environmental bin test, look at the data will know, anyway, now the cost of separate testing TVOC is not high.
CUCAT-V17/V18 why almost no TVOC?
Because CUCAT-V17/V18 does not contain isooctanoic acid, neodecanoic acid, its reactive and high boiling point two major characteristics fully guarantee that the product meets the requirements of the stringent TVOC standards: ◆ Boiling point of 350 ℃ or more.
◆ The boiling point is above 350℃, much higher than the 250℃ defined by VOC, which is not a VOC substance; it exceeds the upper limit of the TVOC regulation of the standard TVOC of sports ground synthetic material, and almost does not increase the TVOC of synthetic material, which solves the problem that the current common organic bismuth zinc catalyst generally contains isooctanoic acid/neodecanoic acid that causes the TVOC to exceed the standard.
V17 and V18 are reactive catalysts, which can be polymerized or grafted in the polymer chain and become part of the polyurethane polymer runway without free state, so it will not increase the VOC or TVOC of plastic runway.
Many engineers think that if the free isooctanoic acid and neo-decanoic acid contained in bismuth zinc is removed, can it pass the test of TVOC? The answer is no, because isooctanoic acid/neodecanoic acid bismuth zinc itself is unstable and very easy to hydrolyze to produce new isooctanoic acid and neodecanoic acid, it is impossible to remove cleanly.
Can you really pass the TVOC test, don’t look at the publicity and promotion, and don’t believe in the contract terms of the breast guarantee, why? Because the real TVOC problem, the chest beaten useless! Then believe what? The test data of the catalyst!
More clever business tactics eventually have to give way to scientific innovation, we always believe that the innovation of science and technology is the driving force for change in the world.
Indeed, the excellent contribution of CUCAT-V17/V18 to TVOC reduction has been affirmed and recognized by the industry!
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