News Details
High efficiency flame retardant of PVC
2017-11-7 19:12:30
High efficiency flame retardant of PVC is a common flame retardant in recent years.
Most of the brominated flame retardants at 200-300 DEG C decompose, PVC thermal decomposition, brominated flame retardants also began to decompose, and can capture the degradation reaction of free radicals, thereby delaying or terminate the chain reaction of combustion. At the same time, the released HBr is a nonflammable gas, which can cover the surface of the material, play a role in obstructing the surface flammable gas, and also inhibit the combustion of materials.
The main disadvantage of brominated flame retardants is to reduce the UV stability of flame retardant substrates, and produce more smoke, corrosive gas and toxic gas when burning, which limits the application of brominated flame retardants.
Intumescent flame retardant and intumescent flame retardant, containing this kind of flame retardant polymer is heated, the surface can generate a uniform layer of carbon foam layer, to heat and oxygen, and smoke suppression effect, and prevent the droplet phenomenon, so it has good flame retardant properties. Intumescent flame retardant system is generally composed of three parts: acid source (dehydrating agent), carbon source (carbon forming agent) and gas source (nitrogen source, foaming source). Intumescent flame retardant mainly acts as flame retardant by forming porous foam carbon layer in condensed phase. Phosphorous nitrogen flame retardant has the advantages of no halogen, low smoke and low toxicity.
The flame retardant of phosphorus series flame retardant is to accelerate the dehydration and carbonization of the polymer at the initial stage of decomposition. The dehydration and carbonization steps must depend on the oxygen-containing groups of the polymer itself, and the polymers with oxygen-containing groups for their own structures. Their flame retardant effect will be better. For polypropylene, due to the molecular structure itself without oxygen containing groups, single use flame retardant flame retardant is ineffective, but if and (0H) 3 and Mg (OH) 2 compound can produce synergistic effect, so as to obtain good flame retardant effect.
It has been widely used in many industries because of its outstanding advantages, such as small density, good mechanical properties, chemical resistance, easy processing, high heat resistance, high deformation temperature and low price. PVC flame retardant has become the most widely used flame retardant material with the highest flame retardant dose and the fastest growth.
Magnesium hydroxide Mg (OH) 2 as a halogen-free flame retardant, flame retardant and smoke in addition to the performance, and is suitable for dehydration of high temperature, high processing temperature of PP polymers such as flame retardant, in reducing the harm and material safety processing on the environment can meet the requirements of relevant laws and regulations, but also to flame retardant plastics recycling more easily. Especially Mg (OH) 2 rich source of raw materials, low prices, PVC as efficient flame retardant has high economic benefit by it, so all over the country in recent years, with the Mg (OH) 2 flame retardant PP attaches great importance to.
However, most enterprises use Mg (OH) 2 flame retardant PP, because Mg (OH) 2 dosage is insufficient, need to add other flame retardants, resulting in high cost formula. For this reason, the author talks about some matters needing attention when using Mg (OH) 2 as PP flame retardant. Mg (OH) 2 flame retardant PP, in order to make the material reach UL94V-0 flame retardant (sample 3.2mm), the dosage should be less than 60%, however, such as the use of Mg (OH) 2 smoke suppression, the dosage can be low, containing 40%Mg (OH) 2 PP smoke density is only about 1 without flame retardant PP 3 /.
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP)
CAS No.:13674-87-8
HS: 29199000
Tax Rate (%): 9%
Tris (1,3-Dichloro-2-Propyl) Phosphate (TDCPP) Raw Materials: Phosphorus Oxychloride, Epichlorohydrin
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP) Use:
The Product Has A High Efficiency Flame Retardant, Low Volatility, High Thermal Stability, Water Resistance, Alkali Stable And Soluble In Most Organic Substances, Processing Performance, With Plastic, Moisture, Anti-Static, Anti-Pull, Anti-Compression Performance. Widely Used In Unsaturated Polyester, Polyurethane Foam, Epoxy Resin, Phenolic Resin, Rubber, Soft Polyvinyl Chloride, Synthetic Fibers And Other Plastics And Coatings At High Temperature Pyrolysis, Can Be Used As Emulsifier And Explosion-Proof Agent.
When the content of Mg (OH) 2 in PP reaches 65%, the mechanical properties, especially the impact strength and elongation, are significantly deteriorated. In order to make the Mg (OH) 2 mechanical properties of flame retardant PP material not to drop a lot, should choose the fine particle size, narrow particle size distribution and uniform Mg (OH) 2 as raw materials, and double coupling surface
treatment, to improve the rheological properties of materials, promote the mixing process through the Mg (OH) 2 PP / heat conduction and to avoid the formation of local hot spots, and improve the compatibility of Mg (OH) 2 and PP, which can be uniformly dispersed in the polymer.
The treated Mg (OH) 2 flame retardant PP, the toughening of PP modified, even at high Mg (OH) 2 content of flame retardant PP can obtain processing properties and good mechanical properties. In order to make the Mg (OH) 2 in PP uniformly dispersed, by buss kneader (BussKenader), or German double screw extruder, reciprocating single screw or mixed mixing extruding machine, and the use of mixed feeding reasonable mixing methods.
For example, all PP and toughening agents and the required amount of Mg (OH) 2 should be first added to the mixing mixer for several minutes, then mixed for 60% minutes, and then the remaining Mg (OH) 2 will be added second times.
When feeding, attention should be paid to uniform feeding, accurate measurement. If the mixer is used for mixing, the Mg (OH) 2 should be accurately measured with the addition of two addition method, and the loading rate is better in the range of 87% ~ 93%.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Most of the brominated flame retardants at 200-300 DEG C decompose, PVC thermal decomposition, brominated flame retardants also began to decompose, and can capture the degradation reaction of free radicals, thereby delaying or terminate the chain reaction of combustion. At the same time, the released HBr is a nonflammable gas, which can cover the surface of the material, play a role in obstructing the surface flammable gas, and also inhibit the combustion of materials.
The main disadvantage of brominated flame retardants is to reduce the UV stability of flame retardant substrates, and produce more smoke, corrosive gas and toxic gas when burning, which limits the application of brominated flame retardants.
Intumescent flame retardant and intumescent flame retardant, containing this kind of flame retardant polymer is heated, the surface can generate a uniform layer of carbon foam layer, to heat and oxygen, and smoke suppression effect, and prevent the droplet phenomenon, so it has good flame retardant properties. Intumescent flame retardant system is generally composed of three parts: acid source (dehydrating agent), carbon source (carbon forming agent) and gas source (nitrogen source, foaming source). Intumescent flame retardant mainly acts as flame retardant by forming porous foam carbon layer in condensed phase. Phosphorous nitrogen flame retardant has the advantages of no halogen, low smoke and low toxicity.
The flame retardant of phosphorus series flame retardant is to accelerate the dehydration and carbonization of the polymer at the initial stage of decomposition. The dehydration and carbonization steps must depend on the oxygen-containing groups of the polymer itself, and the polymers with oxygen-containing groups for their own structures. Their flame retardant effect will be better. For polypropylene, due to the molecular structure itself without oxygen containing groups, single use flame retardant flame retardant is ineffective, but if and (0H) 3 and Mg (OH) 2 compound can produce synergistic effect, so as to obtain good flame retardant effect.
It has been widely used in many industries because of its outstanding advantages, such as small density, good mechanical properties, chemical resistance, easy processing, high heat resistance, high deformation temperature and low price. PVC flame retardant has become the most widely used flame retardant material with the highest flame retardant dose and the fastest growth.
Magnesium hydroxide Mg (OH) 2 as a halogen-free flame retardant, flame retardant and smoke in addition to the performance, and is suitable for dehydration of high temperature, high processing temperature of PP polymers such as flame retardant, in reducing the harm and material safety processing on the environment can meet the requirements of relevant laws and regulations, but also to flame retardant plastics recycling more easily. Especially Mg (OH) 2 rich source of raw materials, low prices, PVC as efficient flame retardant has high economic benefit by it, so all over the country in recent years, with the Mg (OH) 2 flame retardant PP attaches great importance to.
However, most enterprises use Mg (OH) 2 flame retardant PP, because Mg (OH) 2 dosage is insufficient, need to add other flame retardants, resulting in high cost formula. For this reason, the author talks about some matters needing attention when using Mg (OH) 2 as PP flame retardant. Mg (OH) 2 flame retardant PP, in order to make the material reach UL94V-0 flame retardant (sample 3.2mm), the dosage should be less than 60%, however, such as the use of Mg (OH) 2 smoke suppression, the dosage can be low, containing 40%Mg (OH) 2 PP smoke density is only about 1 without flame retardant PP 3 /.
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP)
CAS No.:13674-87-8
HS: 29199000
Tax Rate (%): 9%
Tris (1,3-Dichloro-2-Propyl) Phosphate (TDCPP) Raw Materials: Phosphorus Oxychloride, Epichlorohydrin
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP) Use:
The Product Has A High Efficiency Flame Retardant, Low Volatility, High Thermal Stability, Water Resistance, Alkali Stable And Soluble In Most Organic Substances, Processing Performance, With Plastic, Moisture, Anti-Static, Anti-Pull, Anti-Compression Performance. Widely Used In Unsaturated Polyester, Polyurethane Foam, Epoxy Resin, Phenolic Resin, Rubber, Soft Polyvinyl Chloride, Synthetic Fibers And Other Plastics And Coatings At High Temperature Pyrolysis, Can Be Used As Emulsifier And Explosion-Proof Agent.
When the content of Mg (OH) 2 in PP reaches 65%, the mechanical properties, especially the impact strength and elongation, are significantly deteriorated. In order to make the Mg (OH) 2 mechanical properties of flame retardant PP material not to drop a lot, should choose the fine particle size, narrow particle size distribution and uniform Mg (OH) 2 as raw materials, and double coupling surface
treatment, to improve the rheological properties of materials, promote the mixing process through the Mg (OH) 2 PP / heat conduction and to avoid the formation of local hot spots, and improve the compatibility of Mg (OH) 2 and PP, which can be uniformly dispersed in the polymer.
The treated Mg (OH) 2 flame retardant PP, the toughening of PP modified, even at high Mg (OH) 2 content of flame retardant PP can obtain processing properties and good mechanical properties. In order to make the Mg (OH) 2 in PP uniformly dispersed, by buss kneader (BussKenader), or German double screw extruder, reciprocating single screw or mixed mixing extruding machine, and the use of mixed feeding reasonable mixing methods.
For example, all PP and toughening agents and the required amount of Mg (OH) 2 should be first added to the mixing mixer for several minutes, then mixed for 60% minutes, and then the remaining Mg (OH) 2 will be added second times.
When feeding, attention should be paid to uniform feeding, accurate measurement. If the mixer is used for mixing, the Mg (OH) 2 should be accurately measured with the addition of two addition method, and the loading rate is better in the range of 87% ~ 93%.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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