Polyvinyl chloride (PVC) is a kind of plastic products synthesized by 43% oil and 57% salt, after adding the right amount of plasticizer, can be made into a variety of hard, soft and transparent products, its mechanical properties, excellent electrical properties, acid and alkali resistance, chemical stability is also better, So why should PVC materials with better performance be added to the yellow transparent agent RQT-TS?

We all know that the processing stability of PVC is poor, the melting process is as high as 160℃, and PVC when the temperature reaches 120℃-140℃ decomposition, so PVC resin through modification to achieve melt plasticizing method to process production. On the other hand, HCL (hydrogen chloride) gas is easy to be released when the temperature reaches the decomposition temperature in the process of processing and polymerization. If its generation is not inhibited, the decomposition will be further intensified, and The Ali resonance will be generated, forming conjugated double bonds. When the number reaches more than 7 conjugated double bonds, yellow light will appear, resulting in the phenomenon of yellowing. The product produced in this situation will greatly affect the appearance of the product, and endanger the sales of the product and some influential losses, or even worse, the survival of the factory.
 
Many manufacturers and engineers try to avoid this by adding stabilizers, such as: Base class heat stabilizer (toxic), fatty acid organic tin heat stabilizer, heat stabilizer, etc., but it is not enough to add these, because different stabilizers is has its own advantages and disadvantages, so RQTchem company has developed for this problem to the company,  RQT - TS, can suppress the dehydrochlorination on the basis of stabilizing agent, And to increase the transparency of the yellow effect and the late anti-yellow effect is very good. There are also manufacturers of stabilizers in the production of stabilizers when adding RQT-TS, to achieve further yellow increase transparency effect.
I have also encountered a lot of optical brightener to achieve yellow whitening manufacturers will ask, and they are currently using optical brightener what is the difference, here to distinguish according to the source of plastic yellow answer.    

1.brand new material
PVC new material in the process of processing due to the processing temperature problem, thermal oxidation, accelerate the plastic oxidation yellow.

2.recycled material
Due to the use of PVC products in the process of ultraviolet radiation from the sun and air oxidation yellowing.

Combined with the above mentioned situation, the new material added to the RQT-TS, is to inhibit the emergence of yellow, and the addition of optical brightener is after the emergence of yellow, using the optical principle of optical brightener to remove yellow. To RQT-TS is added in the recycled material, suppress yellow further deepened, the addition of optical brightener is to use the same principle to whitening, so recommend to RQT-TS is added in the new material (Color matching and toning with optical brightener), Recycled PVC plastic add RQT-TS and optical brightener used together, inhibit the occurrence of yellow, first add whiteness, The effect is immediate.

The water-based sealant is mainly made of polymer water emulsion, rubber emulsion, water-soluble resin and water-based polymer materials as the main body, adding dispersant, stabilizer, defoamer, curing agent, titanium dioxide inorganic filler, etc., and is made by grinding. It is needed in construction and industrial fields. Sealant is an adhesive with a wide range of applications, which has the functions of anti-leakage, anti-vibration, anti-sound and heat insulation.

A part of the titanium dioxide should be added to the water-based sealant to cover and increase the whiteness of the product, but why add the water-based sealant optical brightener RQT-C-2? Because in the titanium dioxide process, especially the sulfuric acid titanium dioxide process, most of the operations are to remove impurities in the titanium dioxide, because the impurities seriously affect the application performance of the titanium dioxide, especially the whiteness. However, after various operations, there will still be many substances that affect the whiteness of titanium dioxide, so many manufacturers of water-based sealants still feel that the whiteness value of titanium dioxide is relatively low and the color is yellowish. In addition, the whitening principle of titanium dioxide is a physical covering type. When the whiteness reaches a fixed value, the whiteness will not increase. At this time, we need to use the water-based sealant optical brightener RQT-C-2 to complement the color optically. So that the effect can be achieved very well.

The water-based sealant fluorescent whitening agent RQT-C-2 emits visible blue fluorescence by absorbing invisible light. The sealant produced in this way has a very high grade, regardless of the whiteness, hue, and brightness. Therefore, many manufacturers will choose to add part of the water-based sealant whitener during production, and the amount of addition is basically maintained at 100-200 grams per ton of material. The specific amount of addition can be adjusted according to the requirements of the product.

If your water-based sealant also has yellowing, insufficient whiteness, and lack of brightness, you can add a part of the water-based sealant optical brightener RQT-C-2 to improve product quality.

Thermoplastic road marking paint is widely used in road marking in the world at present. It has the characteristics of short construction time, high wear resistance and low price.Now many construction teams encounter a problem, that is, the color of the marking paint will slowly fade after a period of exposure to the sun, resulting in yellowing, and it is difficult to see after the vehicle, especially at night, and it is easy to have traffic accidents.

Today we provide you with a lead - free environmental protection optical brightener RQT-K-1 can solve the yellow hot melt line problem,exudes white from the inside out, rather than the surface of a layer of beads wear away after becoming dim matte reflective rate is greatly reduced. Added optical brightener RQT-K-1 on the road is very obvious, will not appear yellow, dark phenomenon, mainly can increase whiteness, brightness, at night can improve the reflective rate of the line, so that drivers can clearly see the position and direction of the line, to avoid the occurrence of traffic accidents. Optical brightener RQT-K-1 only needs to add 200 grams per ton of thermoplastic road making paint, saving a lot of cost, and has multiple effects of cold resistance, heat resistance, anti-aging, anti-ultraviolet. Four times longer than the existing general marking paint service life.

Road making paint raw materials do not contain volatile components, film forming mechanism is physical cold solidification, the construction by heating the powder coating melting, the use of special equipment coated on the road, the formation of road marking paint after condensation. Hot melt coating has the advantages of fast drying, anti-wear, especially outstanding reflective performance at night, and is commonly used for road marking paint.

Hot melt road making paint have excellent performance and different prices. Hot melt road making paint by resin, glass beads, coloring pigments, titanium dioxide, optical brightener and so on, in which the addition of titanium dioxide is relatively large, which is the main reason for the high price of hot melt coating. So is there a way to ensure the quality of hot melt coating at the same time, reduce production costs?

In fact, as long as the addition of a small amount of hot melt road making paint optical brightener, you can reduce the cost, and can also improve the quality of hot melt road making paint. Hot-melt road making paint optical brightener and titanium dioxide, can play a role in increasing the whiteness of the coating. The difference is that hot melt road making paint whitening agent is optical whitening, it can break through the whiteness of titanium dioxide peak, and whitening agent can also absorb ultraviolet reflection blue violet light, in other words, can protect the road making paint from ultraviolet damage, increase the brightness of the coating.

Hot melt road making paint needs to be dissolved at high temperature, so the optical brightener needs to have the characteristics of high temperature resistance and strong dispersion, and then the road surface for a long time, so the optical brightener weather resistance, that is, the anti-yellowing performance should be strong. Optical brightener K-1 upgraded version of whether from high temperature resistance, whiteness value, dispersion solubility, and weather resistance are very good, RQT chemistryoptical brightener is specifically developed for hot melt road making paint.

The effect of adding hot melt road making paint optical brightener K-1:

1. Economy. The amount of hot melt road making paint optical brightener is small, the whitening intensity is high, the amount of very small can produce very good whitening effect. Every 100 kilograms of hot melt road making paint to add whitening agent 10 grams 20 grams, whitening effect will be significantly improved, so as to reduce the amount of titanium dioxide. Adding brightener K-1 upgraded version, can greatly reduce the amount of titanium dioxide, thus saving costs.

2. adding optical brightener K-1 upgraded version, the service life of road marking can be extended, and can ensure that in a longer time, the marking remains complete and clear, white still reduce the waste of manpower and material resources brought by repeated construction, and reduce the obstruction and impact on normal traffic.

3. The night reflection performance is improved. After adding optical brightener K-1 to the upgraded version, the night reflection coefficient of road marking can be greatly improved, thus improving the driving efficiency at night.

Titanium dioxide continues to rise in price, the cost of hot melt (thermoplastic)road making paint is getting higher and higher, if you want to reduce production costs do not reduce product quality, RQT optical brightener K-1 is the best choice.

Optical brightener KCB, also known as fluorescent whitening agent 367, is mainly used to whiten EVA foamed shoe material, synthetic fiber and plastic, and can be used to whiten plastic film, pressure molding material and injection molding material.

 For the application of EVA foam material, EVA masterbatch believe everyone will not feel strange, in the present circumstances, can be used in EVA foam material, EVA masterbatch on the optical brightener KCB only, there may be a doubt for many users, so why can only use optical brightener KCB, whitening agent model, color appearance is about the same, but can only KCB on EVA foam material, EVA masterbatch. Besides, the price of fluorescent whitening agent KCB is on the high side. Why not use cheap fluorescent whitening agent? This needs to understand the advantages and disadvantages of KCB to better understand!

The plastic industry is a very big industry, according to various plastics different characteristics of use, can be divided into general plastic, engineering plastic and special plastic three types, and these three types are divided into :PE, PP, PPS, PPO, PA, PC, POM and other hundreds of types; Some of these plastic molding manufacturing process temperature is very high, even up to 300 degrees or so, generally speaking, we can judge a plastics for what kind of fluorescent whitening agent, first of all, judging from plastic molding temperature, the EVA material formed in 210 to about 230 ℃ temperature, that rules out a lot of heat-resistant plastic fluorescent whitening agent is below 210 ℃;

The following table is above 210 ℃ of heat-resistant plastic on the market at present fluorescent whitening agent:

type T

OB-1 350℃

KCB 215℃

KSN 275℃

127 220℃

The light emitted by some optical brighteners is bluish, red or yellow. From the above table, KCB even has some disadvantages in terms of temperature resistance. From the perspective of temperature resistance, the optical brighteners ob-1, KSN and 127 should be used first.

Asian people like slant blue, white, European and American people like to slant red white, so the domestic production of EVA foam material, EVA masterbatch would need to use hair blue light bleaching agent, and the original white substrate slant blue product formation, and the optical brightener KSN red light and fluorescent whitening agent 127 rounds, so can't use KSN and 127, and 127 weatherability and fluorescent whitening agent is poorer, whitening effect, although very strong, but the effect is not permanent, shoe shoe can even reach the whole process 1 year cycle, so fluorescent whitening agent 127 although good temperature resistance, but cannot be used in EVA foaming material

The following table is the current market plastic optical brightener color light:

type color

OB-1 Blue

KCB Blue

KSN Red

127 Red

Green the rest of the optical brightener OB - 1 and a optical brightener OB - 1 yellow, light yellow), the light is slant blue, and OB - 1 cheaper price, but the biggest problem is OB - 1 stability is bad, easy to precipitate migration, migration precipitation lead to local yellow green products, if the shoes appear this problem, that is not the problem of white is not white, is a problem that can be sold, with OB - 1 at the end of the day was not worth the cost;

The following table shows the stability of plastic optical brightener on the market at present:

Type stability

OB-1 Poor

KCB good

KSN good

127 Poor

And EVA foam have certain request for the number of bubble size, bubble too big not wear-resisting, bubble too small elasticity, and besides KCB of other three kinds of models will affect the production process, foaming link will produce more bubbles, too small, lead to bubbles shoes material without flexibility, can't use, to sum up, the heat resistance, light, stability, comprehensive consider manufacturability aspects, optical brightener KCB is EVA foam shoes material of choice of whitening, now there is no other fluorescent whitening agent can replace or better, in order to be able to make their shoes material quality stand out, have to curry favor with the end customer, After all, no one likes to wear their own shoes ugly appearance, looks yellow and poor quality, so EVA foamed shoe material fluorescent whitening agent KCB must be added, EVA foamed shoe material what type of fluorescent whitening agent model it has nothing to do with the price.

Blue liquid Yellowish remover &Transparent agent TS for acrylic

Acrylic acid main monomer yellow how to do? High quality acrylic acid for colorless transparent liquid, acrylic acid or production and processing due to raw material problems will cause acrylic yellow, showing light yellow. The acrylic acid can be colorless and transparent by adding 10-20 grams per ton of Yellowish remover &Transparent agent TS for acrylic