Research progress of polyurethane prepolymers

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 obstacle to passing the new national standard. However, many companies do not understand why TVOC does not meet the standard, because the test only shows the results of meeting the standard or not meeting the standard. There is no data to tell companies what reasons caused the failure to meet the standard. Many companies are at a loss, and even think that most manufacturers should follow such harsh standards. It’s possible that you won’t meet the standards and just take a chance.

R&D process

Since the launch of the new national standard for plastic runways, Yourun has judged that TVOC must be the bane of today’s drier, and quickly started research and development work. The product has gone through CUCAT-V01, V02… and has been improved many times until today’s CUCAT- V17, V18 (hereinafter referred to as V17, V18), now V17 and V18 have been used by more and more manufacturers of plastic track materials that pursue high quality. The practice of using V17/V18 environmentally friendly plastic track in various provinces across the country has fully verified this fact. : The TVOC national standard of less than 5mg/m2·h is achievable!

01

Common questions

Why can V17 and V18 plastic runways meet the TVOC requirements of the new national standard?

Why can’t it pass TVOC if ordinary bismuth zinc driers are used instead of V17 and V18?

What substances cause TVOC testing to exceed the standard?

Now Yourun will answer the above questions for you:

Most manufacturers of plastic track materials believe that TVOC is mainly caused by solvents, and such a small amount of driers will not have an impact. ——The truth is exactly the opposite! The Yourun R&D team has invested a lot of R&D funds to trace the root cause of this problem. Qualitative and quantitative data show that most of the reasons for TVOC exceeding the standard are not solvents, because many companies basically do not add solvents in construction. Even if solvents are used, a small amount of solvents have extremely low boiling points and are easy to Volatile, almost no residue – Qualitative and quantitative results show that the largest contributors to TVOC are neodecanoic acid/isooctanoic acid and alkanes below C15. These two types of substances are the drier bismuth zinc neodecanoate, bismuth zinc isooctanoate and plasticizers. caused. Even if the addition amount of bismuth zinc isooctanoic acid/neodecanoate is only 0.1%, the TVOC value contributed by isooctanoic acid and neodecanoic acid exceeds 5mg/m2·h, or even higher!

02

Experimental data

In order to more intuitively explain the contribution of driers to TVOC, we directly conducted a small environmental chamber TVOC test on V17, V18 and isooctanoic acid/bismuth zinc neodecanoate driers in accordance with the new national standard, and they can reach the national standard. required! The data is as follows:

Seeing the data in the above table, are you a little surprised? Why is the TVOC of the bismuth zinc used now so high?

Yes, Yourun tells you that the above data is still isooctanoic acid/bismuth zinc neodecanoate after removing free isooctanoic acid/neodecanoic acid! ! Before the detection data appeared, many engineers did not believe it – it is very simple, just test the bismuth zinc you are using in a small environmental chamber and look at the data. Anyway, the cost of testing TVOC alone is not high now.

Why does CUCAT-V17/V18 contain almost no TVOC?

Because CUCAT-V17/V18 does not contain isooctanoic acid or neodecanoic acid, its reactive nature and high boiling point fully ensure that the product meets the strict TVOC standard requirements:

◆ The boiling point is above 350°C, which is much higher than the 250°C defined by VOC. It is not a VOC substance; it exceeds the upper limit specified by TVOC standard for synthetic materials in sports venues and will hardly increase the TVOC of synthetic materials, solving the problem of current ordinary organic bismuth and zinc drying. Drugs generally contain isooctanoic acid/neodecanoic acid, causing the problem of TVOC exceeding the standard.

◆ Both V17 and V18 are reactive driers. The driers can eventually be polymerized or grafted into the polymer chain segment and become part of the polyurethane polymer track. There is no free state, so it will not increase the VOC of the plastic track. Or TVOC.

Many engineers believe that if the free isooctanoic acid and neodecanoic acid contained in bismuth zinc neodecanoate are removed, can they pass the TVOC test? ? The answer is no, because bismuth zinc isooctanoic acid/neodecanoate itself is unstable and is easily hydrolyzed to produce new isooctanoic acid and neodecanoic acid, which cannot be removed cleanly.

Whether it can really pass the TVOC test, don’t look at publicity and promotion, let alone believe in the contract terms guaranteed by patting your chest. Why? Because there really is something wrong with TVOC, even if your breasts are smashed, it’s useless! So what do you believe? ? Test data of driers! !

No matter how sophisticated business methods are, they will eventually give way to scientific research and innovation. We always firmly believe that scientific and technological innovation is the driving force for world change.

Indeed, CUCAT-V17/V18’s outstanding contribution to reducing TVOC has been affirmed and recognized by the industry