In the past two years, the price of fluorescent brightener has been rising, but why every time the price of fluorescent brightener OB fluctuates has become a hot news in the industry. 

The appearance of the fluorescent brightener OB is a light yellow crystalline powder, the melting point is 201-203 degrees Celsius, the absorption spectrum wavelength is 375nm, and the fluorescence emission wavelength is 435nm. Fluorescent brightener OB is widely used in the plastics industry, and it can be said to be the essential oil in plastic fluorescent brightener. In the plastics industry, the method and amount of fluorescent brightener OB used in different production processes are not the same, such as the production and injection molding, granulation, and film blowing of masterbatch.

Today we will talk about some basic usage and dosage of optical brightener OB.

Adding method of fluorescent brightener OB:

In the production of masterbatch, many manufacturers will also add fluorescent brightener OB to improve the quality of the product. Compared with others, the amount of masterbatch production plus fluorescent brightener OB is much larger, a few kilograms or even ten kilograms per meal, this is also based on the concentration. Color masterbatch plus fluorescent brightener is normal to add the corresponding amount of fluorescent brightener OB directly into the masterbatch, and then stir. This mixing must be uniform, otherwise the masterbatch produced will have some conditions when the next step is to make the product, such as some places are white, some places are dark and yellow. Therefore, the normal stirring is performed with a mixer, and the time can also be slightly longer to achieve sufficient stirring. But not all manufacturers have a mixer, so how do they add fluorescent brightener? Without a mixer, we can dissolve the fluorescent brightener OB. Of course, this dissolution is not with water, but Some organic solvents are used. Such as plasticizers, lubricants, etc., which can dissolve the fluorescent brightener OB.

Fluorescent brightener OB adding ratio:

So what is the ratio? How to add it? Take granulation as an example. We usually dissolve fluorescent brightener OB by dissolving 2 kg of plasticizer to dissolve 200 grams of fluorescent brightener and instill it at the feeding port. I believe that everyone has used drips, drip infusion is like this, adjust the flow according to the production volume, and ensure that it is added evenly. For example, 500 kilograms of granulation in one hour and 1,000 kilograms in two hours. Then, at the end of these two hours, the solution of fluorescent brightener OB that we dissolved has just finished dripping, then the fluorescent brightener OB is added to the granulation of 1000 kilograms. It's very even.

Dosage of fluorescent brightener OB：

Fluorescent brightener OB is a high-end auxiliary, and its addition amount is very small. Normally, the amount of fluorescent brightener OB added per 100kg of polymer:

PVC:200-300g per 1000kg ;

Transparent material :10g per 1000kg can improve the brightness of PVC;

PS: White 10g per 1000kg; 

ABS: 1/10000 of the original color (10g-50g) (can effectively eliminate the inherent yellow in ABS) 1/10000 of the white color (10g-50g);

PE, PP: colorless 0.05/10000;0.1(0.5g-1g) white 0.5/10000;5(5g-50g);

Other plastics: The dosage can refer to the above examples.

Although the addition amount of the fluorescent brightener OB is small, it has a great whitening effect.

Fluorescent brightener OB production introduction:

Product Name：Fluorescent Brightener OB FB 184

Chemical Name：2,5'-Bis[2-(5-tert-buty l-2 benzoxazoly)thiophene

CAS No.：7128-64-5

C.I. No.：184

Molecular Formula：C26H26N2O2N2

Molecular Weight：430 

Appearance:slight greenish yellow powder 

Melting Point:200-202°C 

Purity:≥99% 

Uses：Mainly be used in whitening of thermoplastic, polyvinyl chloride(PVC), polypropylene(PP), polyester fiber, coating, paint & ink etc.

Packing ：25 kg per fiber drum