High-performance low-fiber-exposure flame-retardant reinforced PBT composite and preparation method thereof
A composition and low-floating fiber technology, applied in the field of high-performance low-floating fiber flame-retardant reinforced PBT composition and its preparation, can solve the problems of increasing the risk of precipitation of small molecular substances, poor toughness, application range, glass fiber leakage, etc. , to achieve the effect of simple and efficient preparation method, excellent mechanical properties, and reducing floating fibers on the surface
Inactive Publication Date: 2015-12-30
TIANJIN KINGFA NEW MATERIAL
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Problems solved by technology
However, PBT still has deficiencies in some aspects, such as the appearance of floating fibers in the appearance of flame-retardant reinforced products, and the shortcomings of poor toughness limit its application range to a certain extent.
[0003] For a long time, on the premise of not affecting the mechanical and processing properties of PBT materials, it has been a difficult problem in the industry to improve the defect of glass fiber leakage of flame-retardant reinforced PBT materials. Most researchers use fatty acid esters and ethylene bis-stearin Amide lubricants are used to improve the floating fiber of the product, but the addition of these additives also increases the risk of precipitation of small molecular substances
Method used
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Embodiment 1-5 and comparative example 1-5
[0039] Weigh each component according to the weight percentage in Table 1-2, first dry PBT and PET at 100-140°C for 3-6 hours, and dry the dried PBT resin, PET resin, flame retardant and other additives in Mix in a high-speed mixer for 1-2 minutes to obtain a premixed material. The premixed material is fed into a twin-screw extruder (screw diameter: 35mm, length-to-diameter ratio L / D=40) for melt extrusion, and the glass fiber is side-fed. Among them, the temperature of each screw barrel of the twin-screw extruder (from the feeding port to the machine head) is: 160°C, 260°C, 250°C, 240°C, 200°C, 180°C, 180°C, 180°C, 200°C, 220°C , the screw speed is 300 rpm, and the feed rate is 50kg / h. The product obtained above was dried in an oven at 120°C for 3-4 hours and then injected into a standard sample strip at a temperature of 250°C. The injection-molded standard samples were placed at 25°C and 50% relative humidity for 4 hours before testing performance.
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Abstract
The invention provides a high-performance low-fiber-exposure flame-retardant reinforced PBT composite and a preparation method thereof. The composite is prepared from, by weight, 30-75% of PBT, 1-10% of flexibilizer, 5-30% of short-cut glass fibers, 10-25% of fire retardant, 5-20% of glass fiber exposure improving agents, 1-5% of chain extender and 1-30% of other auxiliary agents, wherein the glass fiber exposure improving agents are PET. Compared with the prior art, the high-performance low-fiber-exposure flame-retardant reinforced polybutylene terephthalate (PBT) composite has the advantages of being low in fiber exposure, good in flame resistance, excellent in mechanical property and applicable to fabrication of products which have high requirements for part appearance such as coil formers, fans and electronic products.
Description
technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-performance low-floating fiber flame-retardant reinforced PBT composition and a preparation method thereof. Background technique [0002] Polybutylene terephthalate (PBT) is a semi-crystalline engineering plastic. After modification, it has good mechanical properties, electrical properties, heat resistance and chemical resistance, etc. It is widely used in automobiles, Electronics, electrical appliances and other industries. However, PBT still has deficiencies in some aspects. For example, the appearance of floating fibers in the finished product of flame-retardant reinforced products is obvious, and the disadvantages of poor toughness limit its application range to a certain extent. [0003] For a long time, on the premise of not affecting the mechanical and processing properties of PBT materials, it has been a difficult problem in the industry to improve the d...
Claims
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IPC IPC(8): C08L67/02C08L23/08C08L25/12C08K7/14C08K3/22
Inventor 陈勇文张现军朱文孙东海陶四平
Owner TIANJIN KINGFA NEW MATERIAL