Flame-retardant technology is a kind of technology that must be developed. So many fires are caused by the lack of reasonable use of flame-retardant technology. If fire-retardant technology can be well used, these fires can be avoided. What are the specific applications? What about the field? The following detailed introduction to everyone.
The purpose of the flame-retardant technology is to make non-flame-retardant materials have flame-retardant properties. They are not easy to burn under certain conditions or can self-extinguish. It is a material that provides safety protection. The future development trend of flame retardants is good flame retardant, safer and more environmentally friendly. For this reason, considerable manpower and resources have been devoted to the development of new flame-retardant technologies. Nowadays, several new flame-retardant technologies have also been developed. Xiao Bian next to introduce to you a few new environmentally friendly flame retardant flame retardant technology.
First, the surface modification
Inorganic flame retardants have strong polarity and hydrophilicity, and have poor compatibility with non-polar polymer materials, and the interface is difficult to form a good combination and adhesion. In order to improve its adhesion and interfacial affinity with polymers, surface treatment with coupling agents is one of the most effective methods. Common coupling agents are silanes and titanates. If silane-treated ATH has good flame-retardant effect, it can effectively improve the bending strength of polyester and the tensile strength of epoxy resin; A-TH treated with ethylene-silane can be used to increase the resistance of cross-linked ethylene-vinyl acetate copolymer. Flammability, heat resistance and moisture resistance. Titanate coupling agents and silane coupling agents can be used together to produce a synergistic effect. After the surface modification, the surface activity of ATH is improved, the affinity with the resin is enhanced, the physical and mechanical properties of the product are improved, the processing fluidity of the resin is increased, the moisture absorption rate of the A TH surface is decreased, and the moisture absorption rate is improved. All kinds of electrical properties of flame-retardant products, and increase the flame-retardant effect from V21 to V20.
Inorganic flame retardants have the advantages of high stability, low volatility, low smoke toxicity, and low cost, and are increasingly favored by people. However, its compatibility with synthetic materials is poor, and the amount of addition is large, so that the mechanical properties and heat resistance of the material are reduced. Therefore, it is one of the development trends of inorganic flame retardants to modify the inorganic flame retardant, enhance its compatibility with synthetic materials, and reduce its amount. At present, the ultra-thinning and nano-crystallization of aluminum hydroxide (3 Al(OH)) is the main research and development direction. (3) The large addition of Al(OH) will reduce the mechanical properties of the material, and by refilling the 3 Al(OH) refinement, it will have the effect of plasticizing and strengthening rigid particles, especially nano-sized materials. Since the flame retardant effect is dominated by the chemical reaction, the smaller the particle size of the equal amount of the flame retardant, the larger the specific surface area and the better the flame retardant effect. Ultrafineness is also considered from the aspect of affinity. It is because of the different polarity of aluminum hydroxide and polymer that the physical and mechanical properties of flame-retardant composites are reduced. The ultra-nanosized 3 Al(OH) enhances the interfacial interaction and can be uniformly dispersed in the matrix resin, which improves the mechanical properties of the blend more effectively.
Third, the coordination of coordination
In actual production applications, a single flame retardant always has one or more defects, and using a single flame retardant can hardly meet increasingly higher requirements. The compounding technology of the flame retardant is to compound the phosphorus system, halogen system, nitrogen system and inorganic flame retardant, or some kind of internal, in order to seek the best economic and social benefits. The flame retardant compounding technology can synthesize the advantages of two or more flame retardants to complement each other's performance, achieve the purpose of reducing the amount of flame retardants, and improving the flame retardant performance, processing performance and physical and mechanical properties of the materials.
Cross-linked polymers have much better flame-retardant properties than linear polymers. Adding a small amount of cross-linking agent during the processing of thermoplastics can make the plastic into a partial network structure, which can improve the dispersibility of the flame retardant, contribute to the char formation when the plastic burns, improve the flame retardant performance, and can increase the product's Mechanical, heat-resistant and other properties.
The application of microencapsulation to flame retardants is a new technology developed in recent years. The essence of microencapsulation is to disperse and disperse the flame retardant into particles, encapsulate them with organic or inorganic substances to form microcapsule flame retardants, or use inorganic substances as the carrier to adsorb flame retardants on these inorganic substances. In the void of the carrier, a honeycomb microcapsule flame retardant is formed. The microencapsulation of brominated environmental flame retardants has the following advantages: It can improve the stability of flame retardants; It can improve the compatibility of flame retardants and resins, and the phenomenon of the reduction of physical and mechanical properties of materials can be improved; It can greatly improve The various properties of flame retardants expand their application range.
Six, nano-flame retardant technology
Some nanomaterials have the function of preventing combustion, and they are used as flame retardants in combustible materials. Using their special size and structure effects, they can change the combustibility of combustible materials and make them fireproof. The use of nanotechnology can change the flame-retardant mechanism and improve the flame-retardant properties. Because of its small particle size and large specific surface area, nanoparticle features such as surface effects, volume effects, quantum size effects, and macroscopic quantum tunneling effects provide new possibilities for the design and preparation of high-performance, multi-functional new materials. Ideas and ways.
The above six technologies are the latest research achievements in flame retardant technology. In the near future, more advanced technologies will be applied to flame retardant products to provide a safer living environment for everyone.
First, building materials industry
Polycarbonate sheet has good light transmittance, impact resistance, UV radiation resistance and dimensional stability of the product and good molding processing performance, making it has obvious technical performance advantages over the inorganic glass traditionally used in the construction industry. China has more than 20 hollow board production lines for polycarbonate building materials, and it needs to use about 70,000 tons of polycarbonate annually, and it will reach 140,000 tons by 2005.
Second, automobile manufacturing
Polycarbonate has good impact resistance, thermal distortion resistance, and good weather resistance, high hardness, so it is suitable for the production of various parts for cars and light trucks, mainly in the lighting system, dashboard, heating plate, in addition to Froster and polycarbonate alloy bumper. According to the data from developed countries, polycarbonate is used in the proportion of 40% to 50% in the electronics, electrical and automobile manufacturing industries. The proportion of China's use in this area accounts for only about 10%. Electrical and electronic and automotive manufacturing are the pillars of China's rapid development. Industry, the future demand for polycarbonate in these areas will be enormous. It is estimated that in 2005, the total number of automobiles in China will reach more than 3 million, and the demand will reach 30,000 tons. Therefore, the application of polycarbonate in this field is extremely promising.
Third, medical equipment
Since polycarbonate products can withstand steam, cleaning agents, heating, and high-dose radiation sterilization without yellowing and physical degradation, they are widely used in artificial kidney hemodialysis equipment and others need to operate under transparent and intuitive conditions. Need repeated sterilization of medical equipment. Such as the production of high-pressure syringes, surgical masks, disposable dental appliances, blood separators and so on.
Fourth, aviation, aerospace
With the rapid development of aviation and aerospace technology, the requirements for various components in aircrafts and spacecrafts have been continuously improved, making the application of PCs in this field increasingly increasing. According to statistics, there are 2,500 polycarbonate parts used on only one Boeing aircraft, and about 2 tons of polycarbonate is used for a single aircraft. On the spacecraft, hundreds of different configurations of fiberglass-reinforced polycarbonate parts and astronauts’ protective equipment were used.
Fifth, the packaging field
New growth points in the packaging sector are various types of water bottles that can be re-sterilized and used. Due to its light weight, good impact resistance and transparency, and the advantages of using hot water and corrosive solutions for washing without deformation and maintaining transparency, PC bottles have completely replaced glass bottles in some fields. It is predicted that with the increasing emphasis on the quality of drinking water, the use of polycarbonate in this area will increase at a rate of more than 10%, and it is expected to reach 60,000 tons in 2005.
Sixth, electronic appliances
Due to its good and constant electrical insulation over a wide range of temperature and humidity, polycarbonate is an excellent insulating material. At the same time, its good flame retardance and dimensional stability make it a broad application field in the electronic and electrical industries. Polycarbonate resin is mainly used for the production of a variety of food processing machinery, power tool housing, body, bracket, refrigerator freezer drawer and vacuum cleaner parts. In addition, polycarbonate materials also show extremely high use value for important components such as computers, video recorders and color televisions with high parts accuracy requirements.
Seventh, optical lens
Polycarbonate occupies an extremely important position in this field because of its unique characteristics of high light transmittance, high refractive index, high impact resistance, dimensional stability and easy processing and molding. Optical lenses made of optical grade polycarbonate can be used not only for cameras, microscopes, telescopes, and optical test instruments, but also for film projector lenses, copier lenses, infrared auto-focus projector lenses, laser beam printer lenses, and each The prisms, multi-faceted mirrors and many other office equipment and home appliances have a very wide application market. Another important application area of polycarbonate in optical lenses is as a lens material for children's eyeglasses, sunglasses and safety glasses and adult eyeglasses. The average annual growth rate of polycarbonate consumption in the world's optical industry has been maintained at more than 20%, showing great market vitality.
With the rise of the information industry, optical discs made of optical grade polycarbonate are being used as a new generation of audio and video information storage media and are rapidly developing at an extremely fast pace. Due to its excellent performance characteristics, polycarbonate has become the main raw material for the world's optical disc manufacturing industry. The amount of polycarbonate consumed by the world's optical disc manufacturing industry has exceeded 20% of the total consumption of polycarbonate, and its average annual growth rate exceeds 10%. China's optical disc production has grown rapidly. According to figures released by the State Press and Publication Administration, there were 748 disc production lines nationwide in 2002, which consumed about 80,000 tons of optical grade polycarbonate and were all imported. Therefore, the application prospect of polycarbonate in the field of optical disc manufacturing is extremely broad.