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CN-121975319-A - Flat glass fiber reinforced PA66 flame-retardant composite material and preparation method thereof

CN121975319ACN 121975319 ACN121975319 ACN 121975319ACN-121975319-A

Abstract

The invention relates to the technical field of engineering plastics, in particular to a flat glass fiber reinforced PA66 flame-retardant composite material and a preparation method thereof, wherein the raw material components of the flat glass fiber reinforced PA66 flame-retardant composite material comprise, by mass, 20% -70% of nylon 66, 15% -55% of flat glass fiber, 6% -18% of flame retardant and 0% -2% of antioxidant. The glass fiber reinforced PA66 composite material provided by the invention has a simple formula, the consumption of the flame retardant is reduced by 20% compared with that of the traditional round glass fiber, the flame retardant performance of the product reaches V0 level, and meanwhile, the mechanical property is excellent, the molding processing method is simple, and the glass fiber reinforced PA66 composite material can be used for preparing parts with high mechanical property and high flame retardant requirement.

Inventors

  • LIU LEI
  • MA WENDI
  • CHEN ZHIQIANG
  • ZENG QINGWEN
  • HE YONG
  • ZHOU JIANGANG
  • GONG KELI
  • YAN BIN
  • HAO MINGYANG
  • FAN ZHENHUA
  • LIANG SHAN

Assignees

  • 重庆国际复合材料股份有限公司

Dates

Publication Date
20260505
Application Date
20260402

Claims (10)

  1. 1. The flat glass fiber reinforced PA66 flame-retardant composite material is characterized by comprising the following raw materials in percentage by mass: Nylon 66 accounts for 20% -70%; 15% -55% of flat glass fibers; 6% -18% of flame retardant; 0-2% of an antioxidant.
  2. 2. The flat glass fiber reinforced PA66 flame retardant composite of claim 1, wherein said nylon 66 is a low viscosity nylon 66.
  3. 3. The flat glass fiber reinforced PA66 flame retardant composite material of claim 1, wherein the length of the flat glass fiber is 1-6 mm, and the ratio of the long diameter to the short diameter of the cross section is 2-8.
  4. 4. The flat glass fiber reinforced PA66 flame retardant composite material according to claim 3, wherein the length of the flat glass fiber is 2-4 mm, and the ratio of the long diameter to the short diameter of the cross section is 2-5.
  5. 5. The flat glass fiber reinforced PA66 flame retardant composite material according to claim 1, wherein the mass fraction of the flat glass fiber is 20% -50%.
  6. 6. The flat glass fiber reinforced PA66 flame retardant composite of claim 1, wherein the flame retardant is OP1314.
  7. 7. The flat glass fiber reinforced PA66 flame retardant composite material according to claim 1, wherein the mass fraction of the flame retardant is 12% -16%.
  8. 8. The flat glass fiber reinforced PA66 flame retardant composite material of claim 1, wherein the antioxidant is selected from any one or more of hindered phenolic antioxidants, amine antioxidants, phosphite antioxidants.
  9. 9. The preparation method of the flat glass fiber reinforced PA66 flame-retardant composite material as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps: Uniformly mixing PA66, a flame retardant and an antioxidant according to a proportion to obtain a premix; And 2, placing the premix into a main feeding port, placing the flat glass fibers into a side feeding port, shearing by a screw, mixing the premix with the sheared flat glass fibers, and extruding by a double screw to obtain the flat glass fiber reinforced PA66 flame-retardant composite material.
  10. 10. The preparation method according to claim 9, wherein the aspect ratio of the twin-screw extruder used for twin-screw extrusion is (30-55): 1; the processing temperature of each section of the double-screw extruder is 220-280 ℃ and the vacuum degree is 0.1MPa.

Description

Flat glass fiber reinforced PA66 flame-retardant composite material and preparation method thereof Technical Field The invention relates to the technical field of engineering plastics, in particular to a flat glass fiber reinforced PA66 flame-retardant composite material and a preparation method thereof. Background Flame-retardant nylon materials (PA 66) used in the fields of electric appliances, energy storage, communication, new energy automobiles and the like are required to have excellent strength to meet the use requirements of different scenes besides good flame retardant performance. A common method of reinforcing PA66 is to introduce glass fibers to improve the mechanical properties and heat resistance of the composite. However, as the glass fiber has a 'wick effect', the combustion of the PA66 material can be accelerated, and the flame retardant is required to be introduced into the glass fiber reinforced PA66 composite material to ensure that the flame retardant performance of the composite material reaches the V0 level. The mechanical property and the insulativity of the material can be reduced by using a large amount of flame retardant, and the use requirements of the parts such as energy storage and the like can not be met. Therefore, the comprehensive mechanical property of the PA66 composite material is improved by other means, the consumption of the flame retardant is reduced, and the glass fiber reinforced PA66 composite material with low consumption of the flame retardant and high mechanical property is realized. CN 119752172A discloses a halogen-free flame-retardant polyamide material for a low-voltage circuit breaker shell and a preparation method thereof, and the glass fiber reinforced nylon composite material is introduced with star polyamide and gluconic acid modified glass fiber, so that the interaction of the star polyamide and the gluconic acid modified glass fiber is improved, the comprehensive performance of the material is improved, the problem of poor compatibility of the glass fiber and resin is solved, and the flame retardant property and mechanical property of the material are improved. But the star polyamide and the modified glass fiber exert synergistic effect to ensure the comprehensive performance of the composite material, and the content of the flame retardant is 15-17 parts by weight, so that the cost performance is lower. How to efficiently prepare the glass fiber reinforced PA66 composite material with low flame retardant consumption and high mechanical property is still a urgent problem in the field. Disclosure of Invention In view of the above, the technical problem to be solved by the invention is to provide a flat glass fiber reinforced PA66 flame-retardant composite material and a preparation method thereof, and the flat glass fiber reinforced PA66 flame-retardant composite material has excellent mechanical properties and flame retardance. The invention provides a flat glass fiber reinforced PA66 flame-retardant composite material, which comprises the following raw materials in percentage by mass: Nylon 66 accounts for 20% -70%; 15% -55% of flat glass fibers; 6% -18% of flame retardant; 0-2% of an antioxidant. The nylon 66 is preferably a low viscosity nylon 66, and in some embodiments, the viscosity of the nylon 66 is preferably 100 to 200 cm 3/g, and may be, for example, 100, 150, 200 cm 3/g. The mass fraction of the nylon 66 is preferably 50% -60%. The length of the flat glass fiber adopted by the invention is preferably 1-6 mm, more preferably 2-4 mm, and can be 1,2, 3,4, 5 and 6mm by way of example. The flat glass fiber has a flat cross section, and the transverse diameter of the flat glass fiber is preferably 15-50 mu m, and the longitudinal diameter of the flat glass fiber is preferably 5-20 mu m. The ratio of the major axis to the minor axis of the cross section of the flat glass fiber is preferably 2 to 8, more preferably 2 to 5, and may be 2,3, 4, or 5, for example. In a specific embodiment of the present invention, the flat glass fiber is ECS301HP-3-M4 series product of Chongqing International composite material Co., ltd, and has a length of 3mm and a ratio of the long diameter to the short diameter of the cross section of 4. The mass fraction of the flat glass fiber is preferably 15% to 55%, more preferably 20% to 50%, still more preferably 25% to 35%, and may be exemplified by 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, or a range value having any of the above values as an upper limit or a lower limit. In the present invention, the flame retardant is preferably OP1314. In some embodiments of the invention, the flame retardant is OP1314 of clariant, switzerland. The mass fraction of the flame retardant is preferably 6% -18%, more preferably 12% -16%, and may be, for example, 6%, 8%, 10%, 12%, 14%, 16%, or a range having any of the above values as an upper limit or a lower limit. According to the invention, compared with the traditional round glass fiber