long glass fiber polybutylene terephthalate pbt plastic material lgf40

plastic industry product pbt lgf40 granules pbt material polymer

PBT-LGF Polybutanediol terephthalate (PBT) has excellent comprehensive properties, such as high crystallinity, rapid prototyping, weather resistance, low friction coefficient, high thermal deformation temperature, good electrical properties, excellent mechanical properties, fatigue resistance, can be ultrasonic welding. However, its notched impact strength is low, forming shrinkage rate is large, hydrolysis resistance is poor, easy to be eroded by halogenated hydrocarbons, after glass fiber reinforcement, because of the product longitudinal and horizontal shrinkage is inconsistent easy to warping products. With its excellent comprehensive performance, PBT is widely used in electronic and electrical appliances, automobile industry, machinery, instruments and household appliances and other fields. Common problem & Solvement Glass fiber reinforced PBT material warps easily Reasons: Warping is the result of uneven shrinkage of the material. The warping of the product can be caused by the orientation and crystallization of the components in the material, the improper technological conditions used in the injection molding, the wrong shape and position of the gate in the mold design, and the uneven thickness of the wall in the product design. The warping of PBT/GF composites is mainly due to the fact that the orientation of the glass fiber in the flow direction restricts the shrinkage of the resin, and the induced crystallization of PBT around the glass fiber strengthens this effect, making the longitudinal (flow direction) shrinkage of the product less than the transverse (perpendicular to the flow direction). This uneven shrinkage leads to the warping of PBT/GF composites. Solution: 1. Add minerals and use the shape symmetry of mineral fillers to reduce the anisotropy caused by the glass fiber orientation; 2. Add amorphous materials to reduce the crystallinity of PBT and reduce the uneven shrinkage caused by crystallization, such AS ASA or AS, but they have poor compatibility with PBT, so appropriate compatibilizers need to be added; 3. Adjust injection molding process, such as increasing mold temperature and increasing injection cycle appropriately. Glass fiber reinforced PBT surface floating fiber problem Reasons: The causes of floating fiber are more complex, in short, there are mainly the following aspects 1. The compatibility of PBT and glass fiber is very poor, resulting in the two can not effectively bond together; 2. The viscosity of PBT and glass fiber is very different, resulting in a tendency of separation between the two in the flow process. When the separation effect is greater than the adhesive force, the separation will occur, and the glass fiber will float to the outer layer and leak out; 3. The existence of shear force will not only lead to local viscosity differences, but also destroy the interface layer melt viscosity on the glass fiber surface, the smaller the interface layer is damaged, the smaller the bonding force on the glass fiber. When the viscosity is low to a certain degree, the glass fiber will get rid of the PBT resin matrix and gradually accumulate to the surface and expose. 4. Influence of mold temperature. Due to the low temperature of the mold surface, the glass fiber with light weight and fast condensation is frozen instantaneously. If it is not fully surrounded by melt in time, it will be exposed and form "floating fiber". Solution: 1) Add compatibilizers, dispersants and lubricants to improve the floating fiber problem. For example, the use of special surface treatment of glass fiber, or adding compatibilizers (such as: SOG, a well-flowing PBT modified compatibilizer) through the "bridge" effect, increase the adhesion of PBT and glass fiber. 2) Optimize the molding process to improve the floating fiber problem. Higher injection molding temperature and mold temperature, larger injection molding pressure and back pressure, faster injection molding speed, lower screw speed, can improve the floating fiber problem to a certain extent. The glass fiber reinforced PBT injection molding process is easy to produce more mold scale Reasons: The formation of mold scale is caused by the high content of small molecules or the poor thermal stability of materials. Compared with other materials, PBT is easy to generate mold scale due to its oligomer and small molecule residue rate usually in the range of 1%-3%. And after the introduction of glass fiber, more obvious. This will lead to the continuous processing process, the need to clean the mold regularly, resulting in low production efficiency. Solution: 1) Reduce the amount of small molecule additives (such as lubricant, coupling agent, etc.), try to choose polymer additives; 2) Improve the thermal stability of PBT and reduce the small molecular products produced by thermal degradation during processing; PBT Application Widely used in machinery, electronic and electrical, automotive industry and household appliances and other fields. Rel...

What is PBT? Polybutylene terephthalate (PBT) is a thermoplastic polyester and one of the five engineering plastics. PBT has excellent comprehensive performance, is one of the toughest engineering plastics, and has high dimensional stability, good chemical corrosion resistance, excellent electrical insulation, good mechanical properties and elasticity, low water absorption and so on. What is PBT-LGF? As one of the engineering plastics, most of the PBT needs to be modified to meet the corresponding requirements in the practical application field. PBT modification is mainly divided into: flame retardant PBT, glass fiber reinforced flame retardant PBT, glass fiber reinforced PBT. The modified PBT material is mainly used in the field of lighting (such as LED lamp shell), electronic and electrical fields (such as relay shell and spinner, socket, optical fiber connector, etc.) and automotive manufacturing (such as junction box, ignition system parts, external door handles, etc.). The difference between Long glass fiber & Short glass fiber Long glass fibers range in length from 6 to 25mm, while staple fibers are usually less than 6mm, or even between 0.2 and 0.6mm. Long glass fiber has more excellent performance in machanical properties. It is more suitable for large products and structural parts. It has 1-3 times higher (toughness) than short fiber, and the tensile strength (strength and rigidity) is increased by 0.5-1 times. What is the application of PBT-LGF? In the lighting industry, most of the lamp shell is used for enhanced flame retardant PBT material, whose performance requirements are easy to process and form, good mechanical properties, high and low temperature cycle resistance, flame retardant level UL94 3.0mm or 1.5mm V0, high temperature resistance, yellowing resistance effect is good. Its appearance requires transparent color or porcelain white shading, smooth surface, no floating fiber. In the field of automobile manufacturing, the modified PBT is mainly used in such as automobile wiper bracket, automobile headlight lighting ring, automobile transmission gear box, windshield pillar, motor shell and so on. TDS for reference only Injection molding About us Xiamen LFT composite plastic Co., Ltd. is a brand-name company that focuses on LFT&LFRT. Long Glass Fiber Series (LGF) & Long Carbon fiber Series (LCF). The company's thermoplastic LFT can be used for LFT-G injection molding and extrusion, and can also be used for LFT-D molding. It can be produced according to customer requirements: 5~25mm in length. The conpany's long-fiber continuous infiltration reinforced thermoplastics have passed ISO9001&16949 system certification, and the products have obtained lots of national trademarks and patents. Come and contact us

What is PBT? Polybutylene terephthalate (PBT) is a thermoplastic polyester and one of the five engineering plastics. PBT has excellent comprehensive performance, is one of the toughest engineering plastics, and has high dimensional stability, good chemical corrosion resistance, excellent electrical insulation, good mechanical properties and elasticity, low water absorption and so on. What is PBT-LGF? As one of the engineering plastics, most of the PBT needs to be modified to meet the corresponding requirements in the practical application field. PBT modification is mainly divided into: flame retardant PBT, glass fiber reinforced flame retardant PBT, glass fiber reinforced PBT. The modified PBT material is mainly used in the field of lighting (such as LED lamp shell), electronic and electrical fields (such as relay shell and spinner, socket, optical fiber connector, etc.) and automotive manufacturing (such as junction box, ignition system parts, external door handles, etc.). The difference between Long glass fiber & Short glass fiber Long glass fibers range in length from 6 to 25mm, while staple fibers are usually less than 6mm, or even between 0.2 and 0.6mm. Long glass fiber has more excellent performance in machanical properties. It is more suitable for large products and structural parts. It has 1-3 times higher (toughness) than short fiber, and the tensile strength (strength and rigidity) is increased by 0.5-1 times. What is the application of PBT-LGF? In the lighting industry, most of the lamp shell is used for enhanced flame retardant PBT material, whose performance requirements are easy to process and form, good mechanical properties, high and low temperature cycle resistance, flame retardant level UL94 3.0mm or 1.5mm V0, high temperature resistance, yellowing resistance effect is good. Its appearance requires transparent color or porcelain white shading, smooth surface, no floating fiber. In the field of automobile manufacturing, the modified PBT is mainly used in such as automobile wiper bracket, automobile headlight lighting ring, automobile transmission gear box, windshield pillar, motor shell and so on. TDS for reference only Injection molding About us Xiamen LFT composite plastic Co., Ltd. is a brand-name company that focuses on LFT&LFRT. Long Glass Fiber Series (LGF) & Long Carbon fiber Series (LCF). The company's thermoplastic LFT can be used for LFT-G injection molding and extrusion, and can also be used for LFT-D molding. It can be produced according to customer requirements: 5~25mm in length. The conpany's long-fiber continuous infiltration reinforced thermoplastics have passed ISO9001&16949 system certification, and the products have obtained lots of national trademarks and patents. Contact us

What is PBT? Polydibutyl terephthalate is a crystalline thermoplastic engineering plastic polymerized by dimethyl terephthalate (DMT) and 1,4-butanediol. PBT can also be called thermoplastic polyester plastic, in order to be used by different processing operators, generally how many additives will be added, or mixed with other plastics, with the proportion of additives is different, can manufacture different specifications of products. Due to its special properties, PBT is an ideal material for special applications in electrical engineering and electronics. 1. mechanical properties: high strength, fatigue resistance, dimensional stability, creep is also small (there is little change under high temperature conditions) 2. heat resistance aging: enhanced UL temperature index of 120~140℃(outdoor long-term aging is also very good) 3. solvent resistance: no stress cracking 4. water stability: PBT is not easy to decompose in water 5. insulation performance: excellent (wet, high temperature can also maintain stable electrical performance) What is fiberglass? Glass fiber (formerly known as glassfiber) is an inorganic nonmetallic material with excellent properties. It is made of pyrophylla, quartz sand, limestone, dolomite, borocalcium, boromite and seven ores as raw materials by high-temperature melting, wire drawing, winding, weaving and other processes. The diameter of its monofilament ranges from several microns to more than twenty microns, equivalent to 1/20-1/5 of a hair, and each fiber filament is composed of hundreds or even thousands of monofilament. Fiberglass products are relatively environmentally friendly within the controllable range. PBT has very weak hygroscopic properties. The tensile strength of the non-enhanced PBT is 50MPa, and the tensile strength of the glass fiber reinforced PBT is 170MPa. PBT crystallizes very quickly, so it is easy to bend and deform parts during injection molding due to uneven cooling. The shrinkage rate of general PBT materials is between 1.5% and 2.8%. PBT materials with 30% glass fiber reinforcement shrink between 0.3% and 1.6%. 1. high temperature resistance After testing, when the temperature reaches 300℃, there is no effect on the strength of glass fiber. 2. high tensile strength The tensile strength of glass fiber is 6.3~6.9g/d in the standard state, and 5.4~5.8g/d in the wet state. 3. good electrical insulation Glass fiber has excellent electrical insulation, is a high-level electrical insulation material, and is also used in insulation materials and fire shielding materials. 4. Burn Glass fiber can be melted into glass beads at high temperature, which meets the requirements of fire prevention and control in the construction industry. 5. good sound insulation The combination of glass fiber and gypsum can achieve a good sound insulation effect Why filled PBT with glass fiber? Adding glass fiber to PBT is a common method of PBT enhancement modification. Glass fiber and PBT resin bonding force is good, after adding a certain amount of glass fiber to PBT resin, not only can maintain the original advantages of PBT resin chemical resistance, processability and so on, but also can greatly improve its mechanical properties, and overcome PBT resin notch sensitivity. Impacts of Long Glass Fiber Reinforced PBT Compounds 01Wear resistance PBT has excellent wear resistance and is advantageous where resistance to friction and wear is required. In applications such as mechanical transmission components and bearings, the wear resistance of PBT has been effectively utilized. 02Mechanical properties PBT has excellent mechanical properties after modification. It has high strength and fatigue resistance, good dimensional stability and low creep. Therefore, PBT is often used for parts that need to withstand larger loads and be used for a long time. 03Thermal stability PBT has excellent thermal stability, can maintain its performance under high temperature conditions, and is not prone to thermal decomposition or deformation. This makes PBT an ideal choice for withstanding high-temperature working environments, such as wire connectors and insulating parts in electronic and electrical equipment. 04Flame retardancy PBT has good flame retardant properties after modification and can meet the flame retardant requirements of some special fields. UL94 is a standard for testing the flame retardant properties of materials. The flame retardant grade of PBT engineering plastics can reach UL94 V-0 level, which means that in the flame test, the burning time of the PBT sample is shorter than 10 seconds, and there is no flame retardant during the burning process. dripping phenomenon. This makes PBT molding materials widely used in fields with high requirements for flame retardancy, such as the electronic and electrical industry, providing reliable guarantee for safety performance.