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CN-121975313-A - Nylon 66 composition and preparation method thereof

CN121975313ACN 121975313 ACN121975313 ACN 121975313ACN-121975313-A

Abstract

The invention belongs to the technical field of high polymer materials, and provides a nylon 66 composition and a preparation method thereof, wherein the nylon 66 composition comprises, by weight, 100 parts of nylon 66 resin, 3-5 parts of modified ammonium polyphosphate, 5-10 parts of modified carbon nanotubes, 0.10-0.28 part of lubricant and 0.1-0.5 part of antioxidant. The preparation method comprises the following steps of weighing raw materials according to parts by weight, adding nylon 66 resin, modified ammonium polyphosphate, modified carbon nano tube, lubricant and antioxidant into a mixer, mixing until uniformity to obtain a mixture, and adding the mixture obtained in the step 1 into a double-screw base machine, mixing, melting, extruding and granulating to obtain the nylon 66 composition. The nylon 66 composition provided by the invention has excellent mechanical properties and flame retardant properties.

Inventors

  • FAN DIANCAI
  • GUAN JINJUN
  • WANG FEIHU
  • LI FEIXIANG
  • Shi Haikuo

Assignees

  • 安徽昊源化工集团有限公司

Dates

Publication Date
20260505
Application Date
20251219

Claims (10)

  1. 1. The nylon 66 composition is characterized by comprising the following components in parts by weight: 100 parts of nylon 66 resin; 3-5 parts of modified ammonium polyphosphate; 5-10 parts of modified carbon nanotubes; 0.10-0.28 parts of lubricant; 0.1-0.5 part of antioxidant; the modified ammonium polyphosphate is prepared by the following steps: Adding a silane coupling agent KH-550 and deionized water into absolute ethyl alcohol, heating to 50-55 ℃, stirring and reacting for 0.5-1.0 h to obtain a silane coupling agent KH-550 hydrolysate, adding ammonium polyphosphate and the silane coupling agent KH-550 hydrolysate into the absolute ethyl alcohol, heating to 60-65 ℃, stirring for 1.0-1.5 h, filtering, and vacuum drying to obtain the modified ammonium polyphosphate.
  2. 2. The nylon 66 composition of claim 1, wherein the dosage ratio of the silane coupling agent KH-550, deionized water and absolute ethyl alcohol is 20g to 8g to 72g, and the dosage ratio of the ammonium polyphosphate, the hydrolysate of the silane coupling agent KH-550 and the absolute ethyl alcohol is 40-42 g to 2.0-2.6 g to 150mL.
  3. 3. The nylon 66 composition of claim 1, wherein the modified carbon nanotubes are prepared by: adding sodium phytate and carboxylated carbon nanotubes into deionized water, dispersing by ultrasonic until uniformity to obtain a solution A, adding cobalt nitrate hexahydrate and copper nitrate into deionized water solution, stirring until uniformity to obtain a solution B, slowly adding the solution B into the solution A, stirring for 0.5-1 h, then placing the solution B into a 195-200 ℃ reaction kettle for continuous reaction for 12-14 h, and filtering, centrifuging, washing and drying after the reaction is finished to obtain the modified carbon nanotubes.
  4. 4. The nylon 66 composition of claim 3, wherein the solution A comprises sodium phytate, carboxylated carbon nanotubes and deionized water in an amount of 4.1-4.2 g to 4.0-4.1 g to 50mL, and the solution B comprises cobalt nitrate hexahydrate, copper nitrate and deionized water in an amount of 3.84-3.86 g to 3.18-3.20 g to 100mL.
  5. 5. The nylon 66 composition of claim 1 wherein the lubricant is at least one of pentaerythritol, ethylene bis stearamide, polyethylene wax, and calcium stearate.
  6. 6. A nylon 66 composition as defined in claim 1 wherein the antioxidants comprise hindered phenolic antioxidants and phosphite antioxidants.
  7. 7. The nylon 66 composition of claim 6, wherein the mass ratio of the hindered phenol antioxidant to the phosphite antioxidant is 1-1.8:1.
  8. 8. The nylon 66 composition of claim 6 wherein the hindered phenolic antioxidant is antioxidant 1010 and the phosphite antioxidant is antioxidant 168.
  9. 9. A method of making a nylon 66 composition as defined in claim 1 comprising the steps of: Step 1, weighing raw materials according to parts by weight, adding nylon 66 resin, modified ammonium polyphosphate, modified carbon nano tubes, a lubricant and an antioxidant into a mixer, and mixing until the materials are uniform to obtain a mixture; And 2, putting the mixture obtained in the step 1 into a double-screw base machine, mixing, melting, extruding and granulating to obtain the nylon 66 composition.
  10. 10. The method for preparing a nylon 66 composition according to claim 9, wherein in the step 2, the temperature of the first zone is 190-200 ℃, the temperature of the second zone is 210-220 ℃, the temperature of the third zone is 220-240 ℃, the temperature of the fourth zone is 240-250 ℃, the temperature of the fifth zone is 260-280 ℃, the temperature of the sixth zone is 270-280 ℃ and the temperature of the machine head is 260-280 ℃ in the twin-screw extruder.

Description

Nylon 66 composition and preparation method thereof Technical Field The invention belongs to the technical field of high polymer materials, and particularly relates to a nylon 66 composition and a preparation method thereof. Background Nylon is a common name for polyamide resins, which is a generic name for a large class of polymers, wherein the yield of nylon 66 and nylon 6 is more than 90%. The nylon resin has the advantages of high mechanical strength, good toughness, fatigue resistance, self-lubricating property, small friction coefficient, wear resistance, heat resistance (long-term use within 100 ℃), easy modification and molding, and the like, and has good comprehensive performance and wide application. The unmodified nylon has poor flame retardant property, can only reach UL 94V-2 level in vertical combustion, has an oxygen index of about 24, can generate dripping in the combustion process, belongs to inflammable materials, and is extremely easy to cause fire in the use process. Particularly in the field of electronic products, since a large number of fires are caused by nylon, and the loss is large, flame retardant modification of nylon is a problem that is concerned with the current academic and industrial industries. At present, the main method applied to the nylon flame-retardant field is to add a halogen-containing flame retardant into a resin matrix, but the halogen-containing flame-retardant material can generate a large amount of smoke and toxic gas in the combustion process, thereby causing secondary injury and pollution to people and the environment. Thus, halogen-free flame retardant systems have attracted increasing attention and development. The halogen-free flame retardant system in the nylon field mainly comprises inorganic flame retardants such as red phosphorus flame retardant, diethyl aluminum hypophosphite flame retardant, nitrogen flame retardant, magnesium hydroxide flame retardant and the like, but the red phosphorus flame retardant has color, large use limitation, and higher addition proportion of other halogen-free flame retardants, so that the mechanical property of the material is damaged greatly, and the use of the material is limited. In order to advocate the concept of green environmental protection, the requirements of the automobile and electronic and electric industries on materials are continuously improved, so that development of a flame retardant with low toxicity and a halogen-free flame retardant product with excellent mechanical properties is very necessary. Therefore, the development of a green halogen-free flame retardant nylon composition with excellent mechanical properties has great significance. Disclosure of Invention The invention aims to provide a nylon 66 composition and a preparation method thereof, which are used for solving the technical problem that the nylon 66 material in the prior art is poor in flame retardant property. The aim of the invention can be achieved by the following technical scheme: The first aspect of the invention provides a nylon 66 composition, which comprises the following components in parts by weight: 100 parts of nylon 66 resin; 3-5 parts of modified ammonium polyphosphate; 5-10 parts of modified carbon nanotubes; 0.10-0.28 parts of lubricant; 0.1-0.5 part of antioxidant; the modified ammonium polyphosphate is prepared by the following steps: Adding a silane coupling agent KH-550 and deionized water into absolute ethyl alcohol, heating to 50-55 ℃, stirring and reacting for 0.5-1.0 h to obtain a silane coupling agent KH-550 hydrolysate, adding ammonium polyphosphate and the silane coupling agent KH-550 hydrolysate into the absolute ethyl alcohol, heating to 60-65 ℃, stirring for 1.0-1.5 h, carrying out suction filtration, and drying in a 60 ℃ vacuum drying oven for 3h to obtain the modified ammonium polyphosphate. As a further scheme of the invention, the dosage ratio of the silane coupling agent KH-550, deionized water and absolute ethyl alcohol is 20g to 8g to 72g, and the dosage ratio of the ammonium polyphosphate, the hydrolysis liquid of the silane coupling agent KH-550 and absolute ethyl alcohol is 40-42 g to 2.0-2.6 g to 150mL. The ammonium polyphosphate is a novel green, nontoxic and environment-friendly inorganic phosphorus flame retardant, has the advantages of high phosphorus content, high nitrogen content, good thermal stability, durable flame retardant property, no toxicity, smoke suppression and the like, but has higher moisture absorption, poorer compatibility with high polymer materials, precipitation after long service time, and wet surface of the materials due to the moisture absorption, so that the mechanical property of the materials is influenced, and the silane coupling agent KH-550 is adopted to modify the ammonium polyphosphate in order to improve the hydrophobicity, flame retardant and resin compatibility of the ammonium polyphosphate, the hydroxyl of the silane coupling agent and the hydroxyl on the