PPFBS flame retardants

PPFBS flame retardants

PPFBS flame retardant is used for polycarbonate and is added 0.06% in polycarbonate - 0.1% PPFBS flame retardants can be used to reduce the flame retardant performance to the UL-94V-0 level (3). 2 mm thick). It should be noted that if the dosage is more than 0.1%, the flame retardant properties of the material will not improve the transparency of polycarbonate.

In order to meet the higher flame retardant requirements, a small amount of siloxane can be added, and the amount of siloxane is 0.02% of the total formula, and the 1.6-mm thick spline flame retardancy can be reached to the ul-94v-0 level by 0.3%. The most commonly used is polymethyl phenylsiloxane, but some siloxane affects the transparency of polycarbonate in PPFBS. Studies have shown that viscosity between 1 x 10 to the negative power 6 minus 4 to 3 x 10 square m2 / s (20 ℃) of poly (methyl phenyl siloxane for PPFBS has good synergistic effect, and viscosity as 4 x 10 negative power 6 to 5 minus 2 x 10 square m2 / s (20 ℃), there are two or more of the silicon atoms in polymer molecular chain is preferred.

PPFBS is of high price, and it is often used to replace PPFBS with partial KSS to reduce costs. For example, in polycarbonate, 0.02% of PPFBS and 0.3% of KSS can be used to achieve UL-94 V - 0 (1.6mm thick).

The use of KSS is widely used in polycarbonate PPFBS flame retardant. It contains no halogen and environmental protection economy. Added 0.05% - 0.1% can increase the concentration of polycarbonate's oxygen index from 27% to around 37%, without affecting the transparency of polycarbonate. The deficiency is that the use alone cannot meet the higher flame retardant requirements, such as the failure to make thin wall components (the thickness is less than or equal to 2).

The flame retardancy of 5mm reaches the UL- 94v-0 level. Practical application, often used with polysiloxane, moreover if at the same time add a small amount of fluoropolymer can make better flame retardant materials, including PAPSQ polyamine propyl/half as many phenyl siloxane, PVDF for poly (vinylidene fluoride. From the a curve in figure 2, it can be seen that a small amount of KSS can make the polycarbonate oxygen index significantly increase, and when the addition amount is 0.1%, it reaches a maximum value of 38.3%, and then declines;

The d-line shows that KSS and PAPSQ, PVDF complex and flame retardant polycarbonate oxygen index have a great improvement, with the addition of 0.5%-38.9%. Another UL - 94 test results showed that 0.05% 0.2% of KSS can make 3.2 mm thick spline of UL - 94 - V - a level 0, but no matter how much to add quantity cannot l. 6 mm thick spline of UL - 94 - V - a level 0, and KSS is flame retardant polycarbonate with PAPSQ, PVDF to 1.6 mm thick spline of UL - 94 - V - a level 0. From figure 2, it can be seen that sulfonate and fluorinated polymers and siloxane and polycarbonate have good synergistic effect.



Triethyl phosphate (TEP)

Triethyl phosphate(Flame retardants TEP) is mainly used as the high boiling point solvents,catalysts, plasticizers, flame retardants, ethylating agent, and organic peroxide stabilizer. And Triethyl phosphate(TEP) is widely used in medicine, pesticides, vinyl ketone, resins, hydraulic oil and other production areas. In Japan, 70% of this product is used in catalyst.

Packing: NW 200KG / galvanized iron (a small cabinet loaded 16 tons a child care), 1000KG/IB barrels (a small cabinet loaded 18 tons), or 23 tons ISOTANK.


According to the existing research, can think aromatic sulfonic acid salt have to speed up the polycarbonate into carbon and promote the role of polycarbonate crosslinking, siloxane has improve the thermal stability of polycarbonate and the promotion of the role of carbon formation. However, the synergetic mechanism of fluoropolymer has a good effect on the formation of polycarbonate droplets.

In numerous polycarbonate with PPFBS flame retardants, sulfonate system has the advantage that the adding quantity is little, high efficiency, but it also has some defects, such as when used alone cannot satisfy some special products such as flame retardant requirements of thin-walled parts. From the published literature, it can be seen that adding some coactive agents such as siloxane and fluoropolymer can further enhance the flame retardant effect in polycarbonate. Therefore, the study of the recombination technology of sulfonate flame retardant will be the future development direction.

In the flame retardant field, chlorinated paraffin and brominated paraffin wax are widely used. Chlorine mass fraction of less than 40% of chlorinated paraffin is mainly used as plasticizer, chlorine mass fraction of 50% ~ 70% chlorinated paraffins, especially chlorinated paraffin - 70, is a kind of widely used to add flame retardant agent. Take the formula reported in literature : add DOP30 to 100 PVC, chlorinated paraffin to 5020, Sb2O33 and appropriate other auxiliary agents, and the oxygen index of the sample can reach 30.

But as for the flame retardant efficiency, chlorine is flame retardant is far worse than bromine flame retardants (such as with flame retardant element quality meter, chlorine flame retarding agent only 50% of the bromide flame retarding agent), so in the past 20 years, part of the chlorine system is flame retardant replaced by bromine flame retardants, such as in recent years, the new development of flame retardant plasticizer --, bromine - chlorinated paraffin. The total halogen content of bromo-chlorinated paraffin is high (50% ~ 70%), with excellent flame retardancy, plasticity and proper viscosity, which is compatible with many high polymers and has low price and has a good prospect of development.

PVC (PVC) products can be divided into two categories: hard and soft. The chlorine content of PVC is 56%, and its oxygen index is greater than 45, so the rigid PVC needs to be further flame retardant only if it is very rare. However, in soft PVC, 65 (100 PVC, lower) flammable ester plasticizers, such as dioctyl phthalate, can be reduced to 36% and the oxygen index can be as low as 22. At the same time, due to the hardness of small, soft PVC can replace rubber in certain circumstances, so widely used in building, automobile, cable with flame retardant requirements such as industry, so the soft PVC flame retardant is necessary. Currently, there are many flame retardants for soft PVC, including phosphate, chlorinated paraffin, antimony trioxide, magnesium hydroxide (MDH), zinc borate, etc.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

http://www.yaruichem.com