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What are the main ingredients in Halogen Free Flame Retardant for Rigid PU Foam?
Halogen Free Flame Retardant is dedicated to Rigid PU Foam, and its main components are phosphorus-based compounds and nitrogen-based compounds. Among the phosphorus series, organic phosphates are the most commonly used, such as tripolyphosphate, ammonium polyphosphate and diethanolamine phosphate, etc., or undecyl phosphonates are used. These compounds are free of halogen and form polyphosphoric acids during combustion, which can isolate oxygen and inhibit the spread of combustion. Inorganic fillers such as aluminum hydroxide and magnesium hydroxide are often added, which decompose thermally during combustion and release water, which not only reduces the temperature, but also dilutes the flammable gas, and does not release volatile harmful substances. Among the nitrogen series, melamine and its derivatives, cyanurates, etc., are more common. They decompose and release nitrogen when heated, which helps to expand the foam structure, form a carbon layer, and enhance flame retardancy. It can also be compounded with phosphorus series for synergistic effect, making the foam carbonized and solid, suppressing smoke and fire protection.
In addition to the above, polymeric flame retardants are still used. The monomer contains phosphorus and nitrogen elements, making the polyurethane body flame retardant without additives. This method can avoid migration and precipitation and enhance the durability of the material. Some preparations are also supplemented with silicones to improve the stability of the foam structure and the synergistic fire efficiency of the flame retardant interface.
Overall, the ingredients used in Halogen Free Flame Retardant are environmentally friendly and halogen-free, low-toxicity and high-efficiency. Phosphorus, nitrogen and inorganic hydroxides, either alone or in combination, are properly matched, so that the polyurethane rigid foam is both flame retardant and carbonized, and the performance is not damaged. Ancient and modern materials and technologies have been progressively innovated, and the world's bitter halogens have been poisonous for a long time. Therefore, it is a way to reconcile the environment and technology.
What are the advantages of Halogen Free Flame Retardant for Rigid PU Foam over Halogen Containing Flame Retardants?
Today's rubber products, polyurethane rigid foam, are widely used in construction, home furnishing, and refrigeration industries. In order to prevent fires, flame retardants are applied in the production process. In the past, halogen-containing materials were used more, but they were awesome. Today's new halogen-free flame retardants have many advantages over halogen-containing ones.
Halogen-containing flame retardants release halogen gas in case of fire, which can prevent the spread of flames. However, when burned, chlorine, bromine and other toxic fumes are often released, which can easily cause poisoning and suffocation, damage people's health, and pollute the air environment. After incineration, the residue is also toxic, and if it accumulates for a long time, it is harmful to water and soil. Therefore, environmental protection regulations have become increasingly strict, so people have been urged to explore halogen-free methods.
Halogen-free flame retardants, mostly phosphorus, nitrogen and other elements, mainly generate harmless gas and carbon layer when burning, isolating oxygen and slowing down combustion. Its advantages are four: First, there is little smoke and harmful gases during hot cracking or combustion, ensuring the safety of humans and animals. Second, its carbonization performance is good, forming a solid carbon layer, enhancing the material's self-extinguishing ability and reducing the spread of fire. Third, during production and use, the environmental harm is much lower than that of halogen-containing flame retardants, which is beneficial to ecological sustainability. Fourth, it adapts to domestic and foreign green standards and can expand the market.
As for the process, halogen-free flame retardants and polyurethane have good compatibility and stable material properties. The foam has a uniform structure, no bad odor, and strong aging resistance. Although the cost is slightly higher, its economy is becoming increasingly apparent with the advancement of industrial technology.
To sum up, the application of halogen-free flame retardants in polyurethane rigid foams has many advantages such as environmental protection, safety, excellent performance, and compliance with future regulations. It is actually the trend of the times and has much to do.
How much Halogen Free Flame Retardant for Rigid PU Foam is added to rigid polyurethane foam?
In rigid polyurethane foam, the amount of halogen-free flame retardants should be determined according to the foam formula, the characteristics of the raw materials used, and the target flame retardant grade. Common halogen-free flame retardants, including phosphorus, nitrogen, and inorganic, are used to improve the fire resistance of materials and reduce the release of soot and harmful gases. Today, halogen-free flame retardants are used, and ammonium tripolyphosphate, red phosphorus, ammonium polyphosphate, expandable graphite, etc. are mostly selected, and the dosages vary.
In the formulation method, the design goals must be weighed first, and the products must meet UL 94 V-0, B1 and other standards. Usually the dosage is 5 to 25% of the total formula quality, but it is by no means a generalization. For example, the addition of ammonium tripolyphosphate is usually 10% to 20%, and is slightly adjusted with foam density, blowing agent, and the ratio of isocyanate to polyol. If ammonium polyphosphate is used, the common addition amount is also around 10%, and for those with high flame retardant requirements, about 15% is desirable. If it is used to improve the performance of carbon formation in case of fire, it can be appropriately increased or decreased to make it compatible with polyols and catalysts. If amines or nitrogen-based flame retardants are used, the addition amount is slightly lower, about 5% to 10%, which can achieve good results and is not easy to affect the mechanical properties of the foam. As for inorganic agents such as talc powder and expandable graphite, it is often supplemented by a ratio of 10% to 25%, supplemented by other flame retardants, which can be synergistic. It must be noted that if the flame retardant effect is enhanced too much, the foam strength and foam fineness will be damaged, the foam body will be brittle, and the process will also be variable. Therefore, when adjusting the ratio, it is advisable to repeatedly test and increase incrementally, fine-tune the foam fluidity, foaming height and curing time limit to make it stable.
However, there may be discrepancies between the laboratory and the actual production. It is recommended to test it before use and gradually adjust the formula to meet the dual needs of flame retardant and environmental protection in construction, automotive and other fields. Overall, the amount of halogen-free flame retardants added to rigid polyurethane foam varies from 5% to 25% depending on the type of flame retardant, target grade, and foam formula. It is only advisable to review in detail with the actual process, step by step, and not excessive.
Does Halogen Free Flame Retardant for Rigid PU Foam Affect the Physical Properties of Foam?
Halogen free flame retardants are used in rigid polyurethane foam, which can curb the spread of flame and is beneficial to safety. However, it may be considered that it will affect the physical properties of the foam. Without generalization, describe it one by one to explain its disadvantages and advantages. The integration of flame retardants lies in its compatibility and dispersion. If it is compatible with the parent, the physical properties will change slightly. Otherwise, the foam structure will inevitably differ.
Flame retardants or change the foaming reaction speed, which affects the size and uniformity of the foam pores. If the pores are loose and uneven, their mechanical strength and thermal insulation properties will be affected. In addition, some halogen-free flame retardants are inorganic. If their particle size is large and the distribution is uneven, the foam will be unevenly stressed and prone to brittle cracking. However, if the product with fine particle size and easy dispersion is selected, this disadvantage can be alleviated, but the process needs to be increased in precision to adapt to it.
The chemical properties of flame retardants may react with the polyurethane main chain to modify the chain structure, or enhance or suppress the elasticity and aging resistance of the material. There are also halogen-free environmentally friendly to dissolve in the reaction components, which is conducive to uniform structure. However, when the dosage is high, the foam foam may be limited, the bulk density will increase, and the apparent hardness will become thicker. Innovative phosphorus and nitrogen flame retardants have both smoke suppression and fire resistance, and the side effects are small, but they also need to be matched with the substrate as appropriate.
Usually, an appropriate amount of high-quality halogen free flame retardant is applied, which has a slight impact on the overall performance of the foam, but the appropriate construction process is required. If the amount is large or the type is not selected properly, it is easy to reduce the strength and reduce the heat insulation. In order to completely suppress the adverse effects, when reconciling the proportion of components, optimizing the foaming process, and selecting the flame retardant category, it is especially necessary to determine the actual application performance requirements. In summary, halogen-free flame retardants applied to rigid polyurethane foam can slightly damage or slightly benefit its physical properties. However, the appropriate choice can be considered both safety and practicality.
Is Halogen Free Flame Retardant for Rigid PU Foam compliant with the latest environmental regulations?
In recent years, the global law of environmental protection has become more and more severe. All industries involved in chemicals, building materials, electronics and thermal insulation must comply with environmental protection standards. Cover the fear of traditional halogenated flame retardants such as bromine and chlorine, which are prone to release toxic flue gas and corrosive gases in fires, harming humans and animals and polluting the environment. The European Union, the United States and East Asian countries have promulgated regulations that stipulate that flame retardant materials must be halogen-free, low-toxic and degradable. Such as the European Union RoHS Directive and REACH regulations, harmful substances such as PBDE and PBB are strictly prohibited or restricted. Emerging green building materials standards are also becoming more stringent in order to reduce the environmental burden.
Halogen Free Flame Retardant (Halogen Free Flame Retardant) was developed in response to the new regulations and is suitable for Rigid PU Foam (rigid polyurethane foam). Its main ingredients are phosphorus, nitrogen or inorganic materials, and it does not release halogens during combustion, resulting in a significant reduction in flue gas toxicity. After some products have been certified, such as UL 94 V-0, RoHS compliance, and REACH registration, they can all be identified. These types of flame retardants not only avoid the environmental risks of halogen, but also meet the requirements of SVHC substances of high concern. In recent years, Green Building international certifications such as LEED and BREEAM also require low toxicity and low emissions, so the application of halogen-free flame retardants is more and more extensive.
However, the specifications are changing with each passing day, and the specific formula and dosage must be carefully examined, taking into account new restriction items such as PFAS, so that it can be said to be complete. Some regions have begun to prudently evaluate certain organophosphorus and phosphine substances, and require enterprises to declare in a timely manner. If the finished product is certified by CB, CE, UL or domestic green products, it can be confirmed that its environmental compliance can be confirmed. If the Halogen Free Flame Retardant used passes the third-party test, has low VOC, no heavy metals, and no SVHC report, it can be recognized that it has basically complied with the current mainstream environmental protection requirements.
To sum up, Halogen Free Flame Retardant is less environmentally harmful than halogen-containing substances, and complies with international environmental protection regulations such as RoHS and REACH. However, we should always pay attention to changes in regulations and strictly review product test reports to ensure their continued legal compliance and not to act outside the rules, in order to be on the right path and benefit the present and future generations.