As a leading Flame Retardant for PBT supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.
What are the Main Types of Flame Retardants for PBT?
Polybutylene terephthalate, referred to as PBT, is a polymer synthesis material, light and strong, widely used in electronics, electrical appliances, automobiles and other fields. However, its nature is flammable, and it will burn and smoke in case of fire, so it must be applied with flame retardant agents to make up for its shortcomings and ensure its safety. Today, the types of flame retardants of PBT are slightly divided into the following:
The first is halogen flame retardants. This type of flame retardant is mainly bromine and chlorine, and is also equipped with antimony trioxide containing antimony as a synergist. It is decomposed to form halogenated hydrogen gas to prevent combustion chain reaction, and its effect is remarkable. However, when it burns, it is prone to soot, and harmful gases escape, which harms people's health and pollutes the environment. Due to the environmental concerns caused by it, Western countries have banned it in recent years, and its use has decreased day by day.
The second is inorganic flame retardants. Common ones such as aluminum hydroxide and magnesium hydroxide, the principle is to release water during heating decomposition, absorb heat and cool down, dilute flammable gases. It can also generate inorganic residues for heat insulation, blocking heat sources and air. Such as expanded graphite, phosphate, etc., are also among them. Such flame retardants are non-toxic and tasteless, environmentally friendly, but the amount is large, and the mechanical strength of vulnerable materials.
The three are organophosphorus flame retardants. This kind of organophosphorus is mainly used, such as diphenyl phosphate, polyphosphate, etc., which decomposes into phosphoric acid when exposed to fire, promotes the carbonization of the polymer surface and forms a film, isolates oxygen and is flame retardant. No harmful flue gas is generated, and the damage to the material is smaller than that of halogen agents, which is the trend of the times.
Tetrazine is a nitrogen-based flame retardant. Such as melamine and its derivatives, mostly in the form of nitrogen release, dilute flammable gas. Often used in combination with organophosphorus, the efficiency is doubled, making it an environmentally friendly new flame retardant material.
There are also coated composite flame retardants, which combine a variety of flame retardants through surface treatment, chemical or physical mixing, and combine their respective advantages, which not only enhances flame retardancy, but
If the technology is increasingly refined, there are more applications of nanomaterials and synergistic flame retardants, such as nano-silicon, montmorillonite, etc., to improve the flame retardant mechanism at the microscale, which is both green and efficient.
In summary, according to the nature and mechanism of PBT flame retardants, there are many types of halogens, inorganic, organic phosphorus, nitrogen series and composite new types, showing the wonderful use of chemical changes, suitable for time-varying and optimal application.
What is the amount of Flame Retardant for PBT?
In the case of polybutylene phthalate (PBT), if you need to increase its flame resistance, you need to add more flame retardants. There are many flame retardants, but they are commonly used in PBT, such as bromine-containing compounds, phosphorus-based flame retardants, and certain flame-retardant materials. The amount used should be carefully considered, not only to ensure material performance, but also to ensure flame retardant, etc.
As usual, the amount of flame retardant used in PBT is 5% to 20% of the weight of the fat. Bromine-based flame retardants, and the amount of bromine content, ranging from 8% to 15%. Phosphorus-based flame retardants, such as polyphosphate amines, are also added in an amount of about 10%. If you use high-grade fillers, such as oxidizing or oxidizing, you need to add a high amount, often ranging from 20% to 30%. These need to be physically controlled to suppress the flame, depending on the release of moisture or improve the effect of carbon retention.
However, the amount of flame retardant addition is not very high. If it exceeds the tolerance of fat, it will cause inconvenience to processing and mechanical properties. Therefore, the formula of the formula is often combined with the performance of flame retardant and other materials, and all can get it, so that it can be used for industrial purposes. For example, UL94, the material needs to be V-0, etc., and it needs to be adjusted according to the type of flame retardant. Bromine-based flame retardant is easy to increase efficiency (such as dioxide trioxide), and the flame retardant effect is increased with less addition. Phosphorus-based nitrogen-containing flame retardant can also be used with the same user, which can improve the flame retardant of the material and maintain good physical properties. As mentioned above, the addition of PBT flame retardant is appropriate. The usual dosage or depending on the type of product, the demand for flame retardant has increased. Seeking the best performance, in order to make a polymer material that is both flame resistant and suitable for use, it can be used in a wide range of applications such as appliances, automobiles, and other materials.
How does Flame Retardant for PBT affect material properties?
Flame retardants are used in the preparation of PBT (polybutylene terephthalate), which can significantly change its material properties. PBT is a thermoplastic engineering plastic with good edge properties, high strength and chemical corrosion resistance. It is self-flammable, flammable in case of fire, and drips when burning, generating harmful gases. Adding flame retardants can suppress its flammability and improve safety, making it suitable for electronics, electrical appliances, automobiles and other fields that require high flame retardant grades.
However, the introduction of flame retardants also changes its internal and external properties. First discuss mechanical properties. Flame retardants are mostly inorganic powders, such as aluminum hydroxide, magnesium hydroxide, or organic phosphorus, bromine, and nitrogen compounds. Such substances have limited compatibility with PBT resins. They are distributed in the matrix, blocking the movement of molecular chains, causing the tensile strength and impact toughness of the material to decrease slightly, and the elongation is also reduced. If the dosage is too high, the material will lose its toughness and be brittle. Therefore, it is necessary to choose an auxiliary agent with good compatibility or optimize the process to maintain the balance of its physical properties.
Re-thermal properties. After PBT is flame retardant, its thermal deformation temperature tends to decrease, and the melting fluidity becomes poor. The high melting point and uneven distribution of edge flame retardants affect the crystallinity and molecular arrangement of the material, resulting in the suppression of the thermal stability of the body. However, its oxygen index is significantly increased, and it is not easy to burn, and can reach UL94 V-0 grade.
Its electrical properties are also affected. PBT has excellent insulation properties, but some flame retardants contain polar components or generate conductive substances. For example, brominated flame retardants release free halogens when burned, which affects the insulation voltage. Therefore, flame retardant systems must be carefully selected in high-demand areas, taking into account environmental protection and performance.
In addition, the light resistance, heat resistance and dispersion of flame retardants also affect the appearance and weather resistance of products. If the flame retardant is not well dispersed, uneven color, rough surface, and the appearance is easily damaged.
In short, although PBT plus flame retardants can improve flame retardant properties, it has an impact on mechanical, electrical and thermal properties. The deployment must weigh the pros and cons, comprehensively consider the application needs, and optimize the formula and process to achieve the desired effect.
What environmental or safety standards does Flame Retardant for PBT meet?
The flame retardant of polybutylene terephthalate (PBT) is designed to improve the safety of materials, and its environmental protection and safety standards must comply with international and many regional norms. The main points it follows are as follows:
The European Union's "Regulations on Registration, Evaluation, Authorization and Restriction of Chemicals" (REACH) strictly restricts the use of harmful chemicals, and requires that the flame retardants used must pass the relevant registration and must not contain substances of high concern. There is also the Restriction of Hazardous Substances Directive (RoHS) in Europe, especially for materials used in electronic and electrical equipment. Its flame retardants must avoid lead, cadmium, mercury, hexavalent chromium and polybrominated biphenyls (PBB), polybrominated diphenyl ethers (PBDE) and other substances. Another example is halogen flame retardants, which are gradually restricted by environmental regulations in Europe and the United States, especially manufacturers that advertise green products, use halogen-free flame retardants to comply with regulations.
The United States of America has the Consumer Product Safety Improvement Act (CPSIA), which requires flame retardants used in children's related products to meet specific measurement standards and must not contain harmful plasticizers such as phthalates. California and several other states also have independent regulations restricting the application of certain toxic flame retardants. Asian countries such as the People's Republic of China implement the "Catalogue of Hazardous Chemicals" and "Measures for the Administration of Restrictions on the Use of Hazardous Substances in Electrical and Electronic Products", which also have relevant regulations on the environmental protection properties of flame retardants; Japan's "Chemical Substance Evaluation and Manufacturing Management Law" and "Home Appliance Recycling Law" also regulate.
International safety standards, there is also the UL94 flame retardant rating in the US UL standard to evaluate the self-extinguishing and safety level of materials. If it can reach the V-0 grade, it shows that under high temperature flames, the material can self-extinguish at a specified time, and is widely used in safety products.
In addition to complying with the above regulations, the green design concept also urges manufacturers to use recyclable, low-toxicity and degradable flame retardants. There are also environmental protection labels such as Blue Angel, TCO, etc., which require materials to be environmentally friendly and safe. If manufacturers can follow and obtain certification, their products will be more favored by the market.
To sum up, the environmental protection and safety standards of PBT flame retardants take into account international common regulations and special requirements of various places. Its core is to reduce environmental and human health threats, promote sustainable use of materials and ecological balance. From this point of view, the research and development and application of materials must comply with legal regulations in order to achieve perfection.
What are the typical application fields of Flame Retardant for PBT?
Polybutylene terephthalate, referred to as PBT, has a tough texture, excellent electrical insulation performance, heat resistance and moisture resistance, and is widely used in modern processes. However, its nature is flammable, and it melts in case of fire, which is prone to disasters. Therefore, chemists add flame retardants to it to suppress flames and enhance safety. On the application field of PBT flame retardant, it is described as follows.
The electrical industry is especially heavy on the flame retardant effect of PBT. All relays, switches, sockets, and junction boxes need this. Because of its insulation, flame retardancy, thermal stability, and long-term use, it is not easy to damage. Electronic devices such as connectors and wiring harness terminals are made of PBT, while flame retardant can prevent short circuits and overloads from causing fires, and comply with the safety regulations of modern informatization.
The automotive industry mostly uses PBT flame retardant materials as parts. Precision accessories in the car, such as wiring harness sheaths, fuse boxes, lamp holders, speaker casings, etc., are all used in harsh environments such as high temperature, oil pollution, vibration, etc., and must rely on flame retardant PBT to prevent fires. In case of short circuit in an accident, the flame retardant characteristics can reduce the spread of fire and ensure the safety of passengers.
Household appliances widely use flame retardant PBT. TV sets, washing machines, vacuum cleaners, microwave ovens and other casings and parts are all suitable for this material. Good flame retardancy, even if the utensils are running at high load, it is difficult to cause combustion, and improve the stability of household daily use. Office equipment such as printers, copiers, and lighting lamps are covered. Due to frequent power supply, the temperature rise is significant. In addition, PBT flame retardant materials are also used in the field of construction and rail transit to prevent fire.
In addition, PBT flame retardant materials are also found in the field of construction and rail transit. Building conductors, junction boxes, or electrical devices inside rail cars are mostly used as fire barriers. Communication equipment casings, industrial automation control components, etc., rely on their excellent flame retardant and mechanical properties in the face of complex working conditions and regulatory requirements.
In short, the application of PBT flame retardants is distributed in the fields of electrical and electronics, automotive industry, home appliances and construction and transportation. Because flame retardant PBT has many advantages such as mechanical toughness, heat and moisture resistance, electrical insulation and processing convenience, it can meet the safety standards required by modern industry and life. It plays an indispensable key role in scientific and technological progress and social security.