News Details
Polypropylene (PP) resin flame retardant
2017-11-29 11:05:42
Polypropylene (PP) resin flame retardant
The precipitation of flame retardants not only affects the normal production, but also often affects the normal production during the injection process, such as powder agglomeration, mold sticking and so on. In the finished products, flame retardants often precipitate and produce white mist substances, which affect the appearance of products and cause the decrease of flame retardancy.
Before solving the problem of flame retardants, we first discuss two important factors that affect the precipitation problem:
1. Compatibility of flame retardants with PP base resin
Polypropylene (PP) resin fire retardant in PP resin generally has two states: filling in resin like filler, and the other in melt state evenly dispersed in resin. As PP is a nonpolar material, polarity polypropylene (PP) resin flame retardant and PP will have interfacial compatibility problems. The worse the interfacial compatibility is, the easier it is to produce the precipitation problem.
Two, the influence of temperature on the precipitation of flame retardants
PP is a semi crystalline material, has a lower glass transition temperature, when the temperature is above the glass transition temperature, with the increase of temperature, the amorphous segments will accelerate the movement of heat, small molecule flame retardant poor compatibility with PP resin can overcome the resistance of the easy migration to the surface.
This is also the reason that sometimes the surface will sometimes precipitate after storing for a period of time, and the injection process is the most obvious process. The precipitation is often reflected on the mold. The higher the injection temperature, the more severe the precipitation. The relationship between the migration rate of flame retardants and temperature can be roughly expressed in Figure four. The precipitation rate in the decomposition range of flame retardants is accelerated obviously with the increase of temperature. At constant temperature, the precipitation is also associated with time.
Triphenyl Phosphate (TPP)
Retardants tpp quality standards:
Appearance: white flaky crystal
Content : ≥ 99%;
Acid value (mgKOH / g): ≤ 0.1;
Free phenol : ≤ 0.1%;
Freezing point : ≥ 47.0 ℃
Chromaticity (APHA): ≤ 60;
Moisture : ≤ 0.1%
Density (50 ℃, g/cm3) :1.185-1 .202
Retardants tpp Packing: NW 25KG / composite paper ( lined with black plastic bags ) , a small cabinet loaded 12.5 tons .
Flame retardant TPP has many advantages, such as excellent transparency, softness, bacterial resistance, and water proof, grease-proof, good electric insulation, as well as good compatibility. Flame retardant TPP is mainly used as the flame-retardant plasticizer for cellulose resin, vinyl resin, natural rubber and synthetic rubber. And it may also be used as the flame-retardant plasticizer for glyceryl triacetate thin ester and film, rigid polyurethane foam, phenolic aldehyde resin, and PPO, etc.
Flame retardant TPP is a kind of halogen-free environment-friendly flame retardant with phosphorus element. Most of the products in the market are self-colored flaky crystal, our product is self-colored crystalline powder, and is more soluble in organic solvents. TPP is not soluble in water, but soluble in benzene, chloroform, ether and acetone, and slightly soluble in Z alcohol. Flame retardant TPP is nonflammable with slight aromatic odor and slight deliquescence. The fusion point is about 50 ℃, and fast melts to hoop-shape when heated. The lubricate effect is excellent, and it is often used as the flame retardant plasticize lubricant. What is more, it is used as the flame retardant for many plastics and resins, such as phenolic aldehyde resin, epoxy resin and so on.
After understanding the cause of precipitation, the improvement of the problem of flame retardant precipitation can be twice the result of half the effort. There are two main methods:
1. with the introduction of strong polar groups (such as amino group, carboxyl group and epoxy group), the interfacial action of flame retardant and PP can be enhanced, which can effectively reduce the precipitation of flame retardants.
2., improve the migration resistance between flame retardants and resins, and reduce the migration rate of low molecular weight flame retardants. Decreasing temperature can reduce the movement between segments or enhance the degree of polymerization of flame retardants and reduce the molecular weight distribution width, which will be an effective measure to reduce the emission of flame retardants.
It is necessary to point out that the precipitated flame retardant PP is not completely precipitated, but it only reduces the mobility of the flame retardants to a great extent. The present precipitation - free flame retardant PP is often built on high technical cost, so the low - cost anti - precipitation is still a subject that the current flame retardant PP material needs to be perfected.
Flame retardant PP material is favored by more and more manufacturers because of its fine density, excellent weather resistance and low comprehensive price. It has successfully replaced flame retardant PS and flame retardant ABS in many applications. Behind the rise of flame-retardant PP materials, there may be a problem that is often encountered. That is the problem of flame retardant material precipitation, which is more obvious in halogen free flame retardants.
The flame retardant PA is generally required to achieve UL94 V-0 level, mainly by adding flame retardant agent, for example, deca brominated polystyrene (BPS), brominated epoxy resin (BER) etc.. When the flame retardant is selected, it is necessary to consider that the flame retardant is not easy to exudate from the PA, and does not lead to the light resistance of the system and the decrease of the impact strength of the material.
Add some disadvantages of flame retardant has improved, synthesis of some new phosphine oxide containing active functional group monomer, such as three aryl phosphine oxide (TPO), and nylon 66 salt and hexamethylendiamine copolymer can be prepared with the main chain of TPO nylon 66 copolymers. This kind of flame retardant PA can play the role of flame retardancy in condensed phase and gas phase. As flame retardants become a part of flame retardant PA, it has long lasting flame retardancy.
In addition MCA (melamine cyanurate) as flame retardants and red phosphorus compound in PA flame retardant treatment is also often used, also can obtain a good flame retardant effect.
Flame retardant polypropylene manufacturers are also scattered. From the perspective of main products, flame retardant polypropylene is mainly used in household appliances manufacturing, furniture manufacturing, automobile manufacturing, building materials and other fields. More centralized is used to make small electrical accessories, auto parts, and so on, although the amount is large, but the demand is more dispersed.
At present, there are many kinds of flame retardant polypropylene in the market, and the difference of product grade is large. This is mainly to meet the needs of different levels of downstream users. More than 20 kinds of homemade flame retardant polypropylene samples were analyzed. It was found that various kinds of flame retardants were used, and all kinds of polypropylene commonly used as flame retardants were applied.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The precipitation of flame retardants not only affects the normal production, but also often affects the normal production during the injection process, such as powder agglomeration, mold sticking and so on. In the finished products, flame retardants often precipitate and produce white mist substances, which affect the appearance of products and cause the decrease of flame retardancy.
Before solving the problem of flame retardants, we first discuss two important factors that affect the precipitation problem:
1. Compatibility of flame retardants with PP base resin
Polypropylene (PP) resin fire retardant in PP resin generally has two states: filling in resin like filler, and the other in melt state evenly dispersed in resin. As PP is a nonpolar material, polarity polypropylene (PP) resin flame retardant and PP will have interfacial compatibility problems. The worse the interfacial compatibility is, the easier it is to produce the precipitation problem.
Two, the influence of temperature on the precipitation of flame retardants
PP is a semi crystalline material, has a lower glass transition temperature, when the temperature is above the glass transition temperature, with the increase of temperature, the amorphous segments will accelerate the movement of heat, small molecule flame retardant poor compatibility with PP resin can overcome the resistance of the easy migration to the surface.
This is also the reason that sometimes the surface will sometimes precipitate after storing for a period of time, and the injection process is the most obvious process. The precipitation is often reflected on the mold. The higher the injection temperature, the more severe the precipitation. The relationship between the migration rate of flame retardants and temperature can be roughly expressed in Figure four. The precipitation rate in the decomposition range of flame retardants is accelerated obviously with the increase of temperature. At constant temperature, the precipitation is also associated with time.
Triphenyl Phosphate (TPP)
Retardants tpp quality standards:
Appearance: white flaky crystal
Content : ≥ 99%;
Acid value (mgKOH / g): ≤ 0.1;
Free phenol : ≤ 0.1%;
Freezing point : ≥ 47.0 ℃
Chromaticity (APHA): ≤ 60;
Moisture : ≤ 0.1%
Density (50 ℃, g/cm3) :1.185-1 .202
Retardants tpp Packing: NW 25KG / composite paper ( lined with black plastic bags ) , a small cabinet loaded 12.5 tons .
Flame retardant TPP has many advantages, such as excellent transparency, softness, bacterial resistance, and water proof, grease-proof, good electric insulation, as well as good compatibility. Flame retardant TPP is mainly used as the flame-retardant plasticizer for cellulose resin, vinyl resin, natural rubber and synthetic rubber. And it may also be used as the flame-retardant plasticizer for glyceryl triacetate thin ester and film, rigid polyurethane foam, phenolic aldehyde resin, and PPO, etc.
Flame retardant TPP is a kind of halogen-free environment-friendly flame retardant with phosphorus element. Most of the products in the market are self-colored flaky crystal, our product is self-colored crystalline powder, and is more soluble in organic solvents. TPP is not soluble in water, but soluble in benzene, chloroform, ether and acetone, and slightly soluble in Z alcohol. Flame retardant TPP is nonflammable with slight aromatic odor and slight deliquescence. The fusion point is about 50 ℃, and fast melts to hoop-shape when heated. The lubricate effect is excellent, and it is often used as the flame retardant plasticize lubricant. What is more, it is used as the flame retardant for many plastics and resins, such as phenolic aldehyde resin, epoxy resin and so on.
After understanding the cause of precipitation, the improvement of the problem of flame retardant precipitation can be twice the result of half the effort. There are two main methods:
1. with the introduction of strong polar groups (such as amino group, carboxyl group and epoxy group), the interfacial action of flame retardant and PP can be enhanced, which can effectively reduce the precipitation of flame retardants.
2., improve the migration resistance between flame retardants and resins, and reduce the migration rate of low molecular weight flame retardants. Decreasing temperature can reduce the movement between segments or enhance the degree of polymerization of flame retardants and reduce the molecular weight distribution width, which will be an effective measure to reduce the emission of flame retardants.
It is necessary to point out that the precipitated flame retardant PP is not completely precipitated, but it only reduces the mobility of the flame retardants to a great extent. The present precipitation - free flame retardant PP is often built on high technical cost, so the low - cost anti - precipitation is still a subject that the current flame retardant PP material needs to be perfected.
Flame retardant PP material is favored by more and more manufacturers because of its fine density, excellent weather resistance and low comprehensive price. It has successfully replaced flame retardant PS and flame retardant ABS in many applications. Behind the rise of flame-retardant PP materials, there may be a problem that is often encountered. That is the problem of flame retardant material precipitation, which is more obvious in halogen free flame retardants.
The flame retardant PA is generally required to achieve UL94 V-0 level, mainly by adding flame retardant agent, for example, deca brominated polystyrene (BPS), brominated epoxy resin (BER) etc.. When the flame retardant is selected, it is necessary to consider that the flame retardant is not easy to exudate from the PA, and does not lead to the light resistance of the system and the decrease of the impact strength of the material.
Add some disadvantages of flame retardant has improved, synthesis of some new phosphine oxide containing active functional group monomer, such as three aryl phosphine oxide (TPO), and nylon 66 salt and hexamethylendiamine copolymer can be prepared with the main chain of TPO nylon 66 copolymers. This kind of flame retardant PA can play the role of flame retardancy in condensed phase and gas phase. As flame retardants become a part of flame retardant PA, it has long lasting flame retardancy.
In addition MCA (melamine cyanurate) as flame retardants and red phosphorus compound in PA flame retardant treatment is also often used, also can obtain a good flame retardant effect.
Flame retardant polypropylene manufacturers are also scattered. From the perspective of main products, flame retardant polypropylene is mainly used in household appliances manufacturing, furniture manufacturing, automobile manufacturing, building materials and other fields. More centralized is used to make small electrical accessories, auto parts, and so on, although the amount is large, but the demand is more dispersed.
At present, there are many kinds of flame retardant polypropylene in the market, and the difference of product grade is large. This is mainly to meet the needs of different levels of downstream users. More than 20 kinds of homemade flame retardant polypropylene samples were analyzed. It was found that various kinds of flame retardants were used, and all kinds of polypropylene commonly used as flame retardants were applied.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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