Halogen-free flame-retardant long glass fiber reinforced nylon 12 material with high RTI value as well as preparation method and application of halogen-free flame-retardant long glass fiber reinforced nylon 12 material

Abstract

The invention discloses a halogen-free flame-retardant long glass fiber reinforced nylon 12 material with a high RTI value as well as a preparation method and application of the halogen-free flame-retardant long glass fiber reinforced nylon 12 material. The halogen-free flame-retardant long glass fiber reinforced nylon 12 material is prepared from the following components in percentage by weight: 15 to 75 percent of nylon 12, 15 to 55 percent of long glass fibers, 5 to 35 percent of a compatibilization type halogen-free flame retardant master batch, 0 to 10 percent of a flame retardant synergist, 0 to 5 percent of a compatible flexibilizer, 0 to 8 percent of a high-temperature-resistant modifier, 0 to 2 percent of an antioxidant, 0 to 8 percent of a coloring agent, 0 to 0.8 percent of a nucleating agent and the like. The halogen-free flame-retardant nylon 12 material with high tensile strength, high impact strength, high flame-retardant grade and high RTI value is obtained by adding the specially-made compatibilization type halogen-free flame retardant master batch and cooperation among the master batch, the nylon 12 resin, the long glass fibers, the flame-retardant synergist, the compatible flexibilizer, the high-temperature-resistant modifier, the antioxidant, the nucleating agent and the like; and the material has high performance advantages in the application fields of photovoltaic connectors, junction box shells, charging pile plugs and the like.

Description

technical field [0001] The invention belongs to the technical field of modified plastics and composite materials, in particular to a halogen-free flame-retardant long glass fiber reinforced nylon 12 material with a high RTI value and a preparation method thereof. Background technique [0002] Nylon 12 (referred to as PA12) is the common name of polyamide 12. It is a long carbon chain nylon polymer and a special high-performance polymer. It has high impact strength, low water absorption, good dimensional stability, toughness and Good softness, and excellent dielectric properties, friction and wear resistance, heat resistance, chemical resistance, lubricity and dyeing properties, mainly used in plastic alloys, automobile manufacturing, aircraft manufacturing, additive manufacturing (3D Printing), electronic and electrical products, mechanical appliances, medical technology, oil and gas industry and other fields, it is highly irreplaceable. Nylon 12 has a very high added value...

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Problems solved by technology

[0004] CN104497570A discloses a high-temperature-resistant halogen-free flame-retardant nylon composite material and a preparation method thereof, the method is by mixing various components such as nylon copolymer, flame retardant, glass fiber, coupling agent, antioxidant, processing aid, etc. After uniformity, it is put into a twin-screw extruder to melt and extrude to obtain a high-temperature-resistant halogen-free flame-retardant nylon composite material. With the improvement of thermal properties, the process has a long technical route, large equipment investment, and high energy consumption. It involves complex equipment and processes such as high-temperature polymerization and solid-phase viscosification. It is difficult to achieve technical promotion, and the flame retardant used has a great impact on product performance. , notched impact strength and low flame retardant rating

[0005] CN104497570A discloses a low-smoke flame-retardant PA12 composite material and a preparation method thereof. The method obtains a low-smoke flame-retardant PA12 composite material by blending PA12, polybrominated styrene, antimony trioxide, silicon powder, dispersant, and other additives. Smoke flame-retardant PA12 composite material, but the flame retardant used in this method is a halogen-containing flame retardant, which does not meet the requirements of REACH regulations and WEEE directives, and the addition of flame retardants is high, and the mechanical properties and electrical insulation properties are poor, such as tensile properties. The strength is less than 33MPa, and the CTI and RTI values ​​are all low

[0006] CN101503568B discloses a red phosphorus flame-retardant reinforced thermoplastic polyamide composition, which is obtained by blending polyamide resin, microencapsulated red phosphorus, fiber reinforcing materials, additives, etc. A flame-reinforced thermoplastic polyamide composition, but the polyamide used in this method does not include PA12 with excellent comprehensive properties, and the flame retardant is red phosphorus that is simply microencapsulated and embedded, and the flame-retardant efficiency is poor, and the CTI value is low. Low notched impact strength

[0007] The existing technology lacks technical means and application cases for increasing the RTI value of nylon 12, and the halogen-free flame-retardant nylon 12 material prepared by the existing technology has low flame retardancy grade, high flame retardant addition, low tensile strength, Prominent issues such as low gap impact and low CTI value

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