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CN-120118470-B - Low-precipitation high-glowing filament toughening POM composition and preparation method and application thereof

CN120118470BCN 120118470 BCN120118470 BCN 120118470BCN-120118470-B

Abstract

The invention discloses a low-precipitation high-glow-wire toughening POM composition, and a preparation method and application thereof. The POM composition comprises, by weight, 100 parts of POM resin, 20-30 parts of a thermoplastic polyurethane elastomer, and 10-20 parts of a synergistic master batch, wherein the synergistic master batch comprises, by weight, 50-70% of polyamide and 30-50% of melamine cyanurate. According to the invention, melamine cyanurate is coated with polyamide in advance to form the synergistic master batch, and then the synergistic master batch is mixed with the thermoplastic polyurethane elastomer, so that the degradation of POM in the extrusion process is reduced, the toughened POM composition with low precipitation and high glow wire is prepared, the glow wire flammability index can reach 650 ℃ per 2.0mm, and the molding scale is not easy to generate in the processing process.

Inventors

  • CHEN FENG
  • CHEN PINGXU
  • YE NANBIAO
  • DING CHAO
  • JIAO JIAN
  • PENG SHU

Assignees

  • 金发科技股份有限公司

Dates

Publication Date
20260512
Application Date
20231208

Claims (11)

  1. 1. The toughened POM composition with low precipitation and high glowing filament is characterized by comprising the following components in parts by weight: 100 parts of POM resin; 20-30 parts of thermoplastic polyurethane elastomer; 10-20 parts of synergistic master batch; the synergistic master batch comprises, by weight, 50% -70% of polyamide and 30% -50% of melamine cyanurate.
  2. 2. The low-profile, high glow wire toughening POM composition according to claim 1 wherein the synergistic masterbatch comprises the following components in weight percent of polyamide 60% and melamine cyanurate 40%.
  3. 3. The low-extraction, high glow wire toughening POM composition according to claim 1, wherein the polyamide is a polyamide resin having a melting point between 145-170 ℃.
  4. 4. The low-extraction, high glow wire toughening POM composition according to claim 1, wherein the POM resin has a melt index of 2.5-27g/10min at 190 ℃ under 2.16kg test conditions.
  5. 5. The low-extraction, high glow wire toughening POM composition according to claim 1, wherein the thermoplastic polyurethane elastomer has a shore hardness of 80-90A.
  6. 6. The low-precipitate, high-glow wire toughening POM composition according to claim 1, wherein the thermoplastic polyurethane elastomer has a shore hardness of 85A.
  7. 7. The low-precipitation, high-glow wire toughening POM composition according to claim 1, further comprising a primary antioxidant and a secondary antioxidant, wherein the primary antioxidant is a hindered phenolic antioxidant and the secondary antioxidant is a phosphate antioxidant.
  8. 8. The method for preparing a low-precipitation, high-glow wire toughened POM composition according to any of claims 1 to 6, comprising the steps of: s1, preparing synergistic master batches; s2, uniformly mixing POM resin, thermoplastic polyurethane elastomer and synergistic master batch in a high-speed mixer to obtain premix; And S3, carrying out melt extrusion, cooling and granulation on the premix at 150-200 ℃ by a double-screw extruder to obtain the POM composition.
  9. 9. The method of preparing a low-precipitation, high-glow wire toughened POM composition according to claim 7 comprising the steps of: s1, preparing synergistic master batches; S2, uniformly mixing POM resin, thermoplastic polyurethane elastomer, synergistic master batch, main antioxidant and auxiliary antioxidant in a high-speed mixer to obtain premix; And S3, carrying out melt extrusion, cooling and granulation on the premix at 150-200 ℃ by a double-screw extruder to obtain the POM composition.
  10. 10. The method for preparing the toughened POM composition with low precipitation and high glowing filament according to any one of claims 8 to 9, wherein in the step S1, the preparation method of the synergistic masterbatch comprises the steps of adding polyamide and melamine cyanurate into a high-speed mixer to be uniformly mixed to obtain a premix, and carrying out melt extrusion, cooling and granulation on the premix at 160-210 ℃ by a twin-screw extruder to obtain the synergistic masterbatch.
  11. 11. Use of the low-precipitation, high-glow wire toughening POM composition according to any of claims 1 to 7 in electrical components.

Description

Low-precipitation high-glowing filament toughening POM composition and preparation method and application thereof Technical Field The invention relates to the technical field of high polymer materials, in particular to a low-precipitation high-glowing filament toughening POM composition, a preparation method and application thereof. Background Polyoxymethylene (IUPAC name Polyoxymethylene, POM) is a highly crystalline engineering plastic with excellent mechanical properties, good wear resistance, creep resistance, and is widely used in the fields of electronics and electricity, industrial machinery, office equipment, home appliances, automobiles, etc. However, POM resins have low glowing filament flammability indexes, particularly for POM materials used in electrical components, which are required to have good glowing filament properties, generally require a glowing filament flammability index (GWFI) of 650 ℃ per 2.0mm, and the GWFI of current POM resins can only reach 550 ℃ but far from the requirements, and because POM resins are high crystalline polymers, have poor compatibility with other additives, which results in easy precipitation during the preparation process. Thus, there is a need to obtain a low-precipitation, high glow wire toughened POM composition. Disclosure of Invention In order to overcome the defects in the prior art, the invention aims to provide a low-precipitation high-glow-wire toughening POM composition, and a preparation method and application thereof. The POM composition provided by the invention has high glowing filament and low precipitation performance. The technical scheme adopted by the invention is as follows: the toughened POM composition with low precipitation and high glowing filament is characterized by comprising the following components in parts by weight: 100 parts of POM resin; 20-30 parts of thermoplastic polyurethane elastomer; 10-20 parts of synergistic master batch; the synergistic master batch comprises, by weight, 50% -70% of polyamide and 30% -50% of melamine cyanurate. The thermoplastic polyurethane elastomer may be 20 to 30 parts by weight, for example, 22 parts, 24 parts, 26 parts, 28 parts, and specific values between the above values, and the present invention is not intended to be exhaustive of the specific values included in the range for reasons of space and brevity. The weight parts of the synergistic master batch are 10-20 parts, for example, 12 parts, 14 parts, 16 parts and 18 parts, and specific point values among the above point values are limited in space and in the interest of brevity, and the specific point values included in the range are not exhaustive. Preferably, the synergistic master batch comprises the following components in percentage by weight of polyamide 60% and melamine cyanurate 40%. Preferably, the polyamide is a polyamide resin having a melting point between 145 and 170 ℃. Preferably, the POM resin has a melt index of 2.5-27g/10min at 190℃under 2.16kg test conditions. The POM resin may be selected from homo-and/or co-POM, the mass percentage of the POM resin in the composition being not less than 65%. Preferably, the thermoplastic polyurethane elastomer has a Shore hardness of 80-90A according to test Standard ISO 7619-1. Preferably, the thermoplastic polyurethane elastomer has a shore hardness of 85A. Preferably, the POM composition further comprises a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is a hindered phenol antioxidant, and the auxiliary antioxidant is a phosphate antioxidant. The POM composition of the invention can be added with other auxiliary agents such as lubricant, nucleating agent, weather-proof agent and the like. The invention also provides a preparation method of the toughened POM composition with low precipitation and high glowing filament, which comprises the following steps: s1, preparing synergistic master batches; S2, mixing POM resin, thermoplastic polyurethane elastomer, synergistic master batch, main antioxidant and auxiliary antioxidant in a high-speed mixer for 1-2min to obtain premix; And S3, carrying out melt extrusion, cooling and granulation on the premix at 150-200 ℃ by a double-screw extruder to obtain the POM composition. Preferably, in the step S1, the preparation method of the synergistic master batch comprises the steps of adding polyamide and melamine cyanurate into a high-speed mixer together, mixing for 2-5 minutes to obtain a premix, and carrying out melt extrusion, cooling and granulation on the premix by a double-screw extruder at 160-210 ℃ to obtain the synergistic master batch. The invention also provides an application of the low-precipitation high-glow-wire toughening POM composition in electric components, for example, the low-precipitation high-glow-wire toughening POM composition can be used for preparing electric products, electronic components, electrical appliance management peripheral components and the like. Compared with the prior art, the