Halogen-free flame retardant PP: new power
Halogen-free flame retardant PP: new power
Jialixin PP-- a brand dedicated to the study of reinforced PP
一、What is halogen-free flame retardant material?-- resource conservation and environmental friendliness
1)Background
With the progress of society and the acceleration of industrialization, people are constantly putting forward new and higher requirements for materials.Especially for the polymer materials which are mainly sourced from petrochemical industry and coal chemical industry, it is not only required that the materials themselves meet the necessary performance standards, but also that the preparation and application of the materials conform to the characteristics of resource-saving and environment-friendly.In recent years, with the development of green chemistry and technology, halogen-free flame retardant technology has been increasingly mature。
2)Halogen-free flame retardant material:Flame retardant polypropylene
The flame retardant materials developed on the basis of green chemistry and technology are called halogen-free flame retardant materials, which can also be called clean flame retardant materials or ecological flame retardant materials.In a narrow sense, halogen-free flame retardant material refers to the use of halogen-free flame retardant materials.According to the understanding of foreign scholars deeply, halogen free flame retardant technology based on green chemistry and the technology of flame retardant, raw materials selection, flame retardant materials and finished product throughout the design, manufacturing process and waste disposal, etc. The whole ecological chain, and friendly to humans and the environment, as far as possible the use of renewable resources or materials can be recycled, in assuring that there is enough material under the premise of fire safety, with the lowest resource and environmental costs of manufacturing of flame retardant materials。
二、What is a halogen-free,?——Halogen free industry definition and standard
As is known to all, halogen-antimony flame retardant system has high efficiency and stable flame retardant effect, but its disadvantages in many aspects make it undergo a revolution gradually replaced in the world:
First of all, the burning process of plastic materials containing halogens, on the one hand, produces a large number of toxic gases, on the other hand, also produces a large number of dense smoke.According to the statistics of authoritative data, more than 80% of the deaths in the fire are caused by the smoke and poisonous gas from the burning of materials.Secondly, hydrogen halide gas is released when it is burned. Hydrogen halide is dissolved in water and combined with water vapor in the air, which will form acid rain and cause different degrees of damage to buildings, crops and human health.Finally, a small amount of hydrogen halide is released when the process is heated, causing corrosion to the machine or mold.
The industry generally does not limit fluorine (F), iodine (I) or astatine (At) in halogens, and the definition of halogen-free only sets limits for the respective and total amounts of chlorine (Cl) and bromine (Br) in materials or products.The standards organizations of the world also have consistent requirements on halogen-free, as shown in the following table:
At the same time, IT is also the halogen-free control standard for the electronic IT products of the internationally famous big companies such as apple, samsung, dell, asus and SONY.
三、Halogen-free flame retardant PP mission - electronic appliances and appliances industry seekers
Polypropylene (PP) has light density, good rigidity, high strength, chemical resistance and other advantages, and excellent processing performance, is widely used in electronic appliances, home appliances, automobiles and other industries.
In the meantime, because PP price is low, product model is much, modification method is complete, make it most hopeful to realize the engineering of general purpose plastics.PP material with excellent flame retardant performance is an important part of its engineering field, and halogen-free flame retardant PP emerges at the right moment under such a background and has become an explorer in the field of electronic appliances and home appliances!
There is no doubt that the halogen-free flame retardant PP of jialixin plasticizing has become the "leader" among similar products. Its series of products not only have diverse functions and complementary properties, but also have the general characteristics of halogen-free flame retardant PP:
Low smoke - the amount of smoke produced when burning is low and does not produce toxic or corrosive gases。
No halogen -- the content of Cl and Br respectively ≤500 PPM and the total content ≤1000 PPM。
Environmental protection - can pass the UL certification, and meet the requirements of RoHS, SVHC, PFOS&PFOA, 17P, PAHs and other regulations。
Low density - at least 20% lower than the same type of halogen flame retardant PP density, with higher cost performance。
And can meet different customers to different product use needs, truly tailored for customers, optional DIY service purpose!
Jialisin plasticizing has successfully developed high rigid halogen-free flame retardant PP, halogen-free flame retardant PP for weather resistance, glass fiber reinforced halogen-free flame retardant PP, and successfully applied to electrical control box, distribution board, electromagnetic inlet valve, coil skeleton;Microwave oven, wire harness junction box, electric heating table, etc.Heater, drainage pump (for washing machine);Battery shell and external components of lightning arrester;Water inlet valve, washing pump and a series of products.
四、Halogen-free flame retardant PP gains and losses - the storm will return
1. Halogen-free flame retardant PP flame retardant principle:
The halogen-free flame retardant PP is a kind of expanded halogen-free flame retardant, which mainly functions through condensed phase.At a lower temperature, the flame retardant can produce acid which can be used as dehydrating agent.At slightly higher temperatures, the acid promotes the dehydration of PP and the system melts in the process.The water vapor produced by dehydration and the incombustible gas produced by thermal decomposition of PP cause the system which is already in the molten state to expand and foam.At the same time, the ester group in PP was dehydrated and carbonized to form inorganic and carbon residues, and the system was further foamed.When the reaction is nearly complete, the system is gelatinized and solidified to form a porous foam carbon layer。
2. Halogen-free flame retardant PP applicable field:
Halogen-free flame retardant PP improves the flame resistance of materials, and greatly improves GWIT and GWFI to make it widely used in the electronics and electrical industry.However, ammonium polyphosphate, the flame retardant in halogen-free flame retardant PP products, has a certain moisture absorption, in addition, ammonium polyphosphate itself has a certain degree of polymerization, its relative PP chain still belongs to the category of oligomer。
On the one hand, it has no promoting effect on PP crystallization nucleation (including heterogeneous nucleation), on the contrary, it is similar to the function of plasticizer.On the other hand, the molecular weight distribution of PP is increased, thus reducing the regularity of PP molecular chain.When our products for gloss, scratch resistance, voltage resistance requirements are relatively strict, do not recommend the use of this product。
★ Halogen-free flame retardant products are only applicable to products with lower gloss requirements;
★PP itself is not scratch resistant, and halogen-free flame retardant series of products relative to the same kind of traditional bromo-antimony flame retardant and talcum powder, calcium carbonate filling system scratch resistance is relatively weak;
★Halogen-free flame retardant PP products are suitable for parts with lower breakdown voltage requirements, generally no more than 50KV。
3. Common problems and precautions of halogen-free flame retardant PP:
(1)The parts after injection are flame retardant weakdown or not flame retardant
★The parts after injection are flame retardant weakdown Effect of calcium carbonate: halogen-free flame retardant PP series products are sensitive to calcium carbonate, and cannot be mixed with calcium carbonate when injection molding;
★ The parts after injection are flame retardant weakdown Halogen-free flame retardant PP series products if mixed with halogen-not free flame retardant products injection molding, will cause a decrease in flame retardant efficiency, appearance color become dark, injection molding can not be mixed with halogen-free flame retardant products;
★ The parts after injection are flame retardant weakdown Influence of carbon black: halogen-free flame retardant PP series products are sensitive to carbon black. If you need to make gray and black parts, you are suggested to contact professional companies to make black materials or provide special black masterbatches.Small make up under investigation, poly petrochemical learn this aspect is very strong, might as well go to contact。
★ The parts after injection are flame retardant weakdown Effect of agentmold: because agentmold is mostly small molecular material of silicon series, which has a certain negative effect on the flame retardant efficiency of halogen-free flame retardant PP series products, the amount of release agent should be reduced or no agentmold should be used when injection molding;
★ The parts after injection are flame retardant weakdown Influence of recycled materials: over a certain proportion of recycled materials will reduce the flame retardant efficiency of halogen-free flame retardant PP series products, so appropriate control should be taken to reduce the proportion of recycled materials;
★ The parts after injection are flame retardant weakdown Influence of injection pressure or temperature: excessive injection pressure or temperature will lead to slight decomposition of flame retardant agents in halogen-free flame retardant PP series products, resulting in reduced flame retardant efficiency, injection pressure or injection temperature should be appropriately reduced。
(2)The parts after injection are flame retardant weakdown Injection molding parts appear white
★ The parts after injection are flame retardant weakdown Mould influence: the shrinkage rate of halogen-free flame retardant PP series products is relatively stable, the selection of mould must be basically consistent with the data of specific brand shrinkage rate;
★ The parts after injection are flame retardant weakdown Effect of agent mold: the agentmold can be appropriately added on the premise of not affecting the appearance and flame retardant of the product.
★ The parts after injection are flame retardant weakdown Influence of injection molding process: reduce injection molding pressure and holding pressure properly, shorten holding time and extend cooling time。
五、Halogen-free flame retardant outlook
In the future, human beings will pay more attention to the living environment. Halogen-free flame retardant technology will play an important role in improving the living environment of human beings.No halogenated flame retardant materials is increasingly recognized and attention, people will be on the basis of green industry is environmental friendly product requirements to revise the evaluation methods of flame retardant materials and give unity in the whole world, to a large number of long-term use of flame retardant materials to assess, for flame retardant material in the manufacture, use and recycling and waste treatment each link such as accord with the requirement of environmental protection, harmonious use of flame retardant materials, achieve mutual friendly flame retardant materials and human and society。
Future halogen-free flame retardant technology will be the existing flame retardant technology and nano flame retardant technology, catalytic flame retardant technology, carbon grafting flame retardant technology and other new technology organic combination, to achieve the flame retardant materials general, environmental protection, high-performance, multi-functional, replace some of the existing special engineering plastics.It not only reduces the cost of flame retardant materials, but also reduces the types of plastic materials, which brings great convenience for the recycling of plastic materials and the centralized disposal of wastes.Finally, let us look forward to halogen-free flame retardant PP in the field of future materials continue to play an important role