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CN-121975311-A - Polyamide-6-based reinforced halogen-free nylon composite material and preparation method thereof

CN121975311ACN 121975311 ACN121975311 ACN 121975311ACN-121975311-A

Abstract

The invention discloses a polyamide-6-based reinforced halogen-free nylon composite material and a preparation method thereof. The composite material takes synergistically modified polyamide-6 as a matrix, and is prepared by introducing maleic anhydride and 3-aminopropyl triethoxysilane under the conditions of melting or reaction to carry out synergistic modification on the polyamide-6, further adding 2, 5-dihydroxybenzoic acid as an organic micromolecular function regulator, and simultaneously matching with a halogen-free flame retardant, reinforcing filler, a compatilizer, an antioxidant and a processing aid to construct a multicomponent synergistic effect system. The composite material can obtain excellent halogen-free flame retardant property under the condition of low flame retardant dosage, has higher mechanical strength, toughness and processing stability, and is suitable for the fields of electronic appliances, automobile parts and engineering structural materials.

Inventors

  • CUI JIACHENG
  • CUI MENG
  • XU CHENG

Assignees

  • 江苏佳元共聚新材料有限公司

Dates

Publication Date
20260505
Application Date
20260302

Claims (10)

  1. 1. The reinforced halogen-free nylon composite material based on the polyamide-6 is characterized by comprising, by weight, 660-80 parts of synergistic modified polyamide, 1-5 parts of an organic micromolecule function regulator, 10-25 parts of a halogen-free flame retardant, 5-20 parts of a reinforcing filler, 1-5 parts of a compatilizer, 0.1-1.0 part of an antioxidant and 0.1-2.0 parts of a processing aid, wherein the synergistic modified polyamide-6 is obtained by modifying the polyamide-6 under the condition of melting or reaction through the synergistic effect of maleic anhydride and 3-aminopropyl triethoxysilane, the synergistic modified polyamide-6 simultaneously introduces an anhydride reactive structure and a siloxane polarity regulating structure on a molecular chain, and the organic micromolecule function regulator is 2, 5-dihydroxybenzoic acid.
  2. 2. The polyamide-6-based reinforced halogen-free nylon composite material disclosed in claim 1 is characterized in that the synergistic modified polyamide-6 comprises, by weight, polyamide-688-97 parts, maleic anhydride 0.5-3.0 parts, 3-aminopropyl triethoxysilane 0.5-2.0 parts, and di-tert-butyl peroxide 0.01-0.5 parts.
  3. 3. The polyamide-6 based reinforced halogen-free nylon composite according to claim 1 or 2, wherein the preparation method of the synergistically modified polyamide-6 comprises the following steps: (1) Drying polyamide-6; (2) Mixing the dried polyamide-6 with maleic anhydride, 3-aminopropyl triethoxysilane and di-tert-butyl peroxide; (3) Carrying out melting reaction on the mixed materials; (4) And cooling and granulating the reacted material to obtain the synergistic modified polyamide-6.
  4. 4. The polyamide-6 reinforced halogen-free nylon composite material according to claim 3, wherein the drying treatment in the step (1) is performed at 80-100 ℃ for 4-6 hours, and the components in the step (2) are premixed at normal temperature for 5-15 minutes.
  5. 5. The polyamide-6 reinforced halogen-free nylon composite material according to claim 3, wherein the melting reaction in the step (3) is performed in a twin screw extruder, the reaction temperature is 230-260 ℃, and the residence time is 1-5 minutes.
  6. 6. The polyamide-6 reinforced halogen-free nylon composite material according to claim 3, wherein the extrudate obtained in the step (4) is water-cooled and then pelletized, and the pellet size is 2-5 mm.
  7. 7. The polyamide-6 reinforced halogen-free nylon composite material is characterized in that the halogen-free flame retardant is formed by mixing aluminum hypophosphite and melamine polyphosphate according to a mass ratio of 7:3, the reinforced filler is formed by mixing glass fiber and nano silicon dioxide according to a mass ratio of 9:1, the compatilizer is formed by mixing ethylene-octene copolymer grafted maleic anhydride and ethylene-glycidyl methacrylate copolymer according to a mass ratio of 6:4, the antioxidant is formed by mixing antioxidant 1010 and antioxidant 168 according to a mass ratio of 1:1, and the processing aid is formed by mixing ethylene bis stearamide and calcium stearate according to a mass ratio of 7:3.
  8. 8. The preparation method of the polyamide-6-based reinforced halogen-free nylon composite material is characterized by comprising the following steps of: S1, drying the synergic modified polyamide-6 to obtain dried synergic modified polyamide-6; s2, mixing the dried synergistic modified polyamide-6 with an organic micromolecular function regulator, a halogen-free flame retardant, reinforcing filler, a compatilizer, an antioxidant and a processing aid according to a proportion to obtain a mixed material; And S3, carrying out melt blending extrusion, cooling and granulating on the mixed material to obtain the polyamide-6-based reinforced halogen-free nylon composite material.
  9. 9. The preparation method of the polyamide-6 reinforced halogen-free nylon composite material is characterized in that the drying condition of the step S1 is that the drying is carried out at 80-100 ℃, the drying time is 4-6 hours, and the premixing time of each component in the step S2 is 5-15 minutes under the normal temperature condition.
  10. 10. The preparation method of the polyamide-6 reinforced halogen-free nylon composite material is characterized in that the melt blending in the step S3 is carried out in a double-screw extruder, the blending temperature is 230-260 ℃, the residence time is 2-6 minutes, and the extrudate is pelletized after water cooling, and the grain size is 2-5 mm.

Description

Polyamide-6-based reinforced halogen-free nylon composite material and preparation method thereof Technical Field The invention belongs to the technical field of polymer composite materials, and particularly relates to a polyamide-6-based reinforced halogen-free nylon composite material and a preparation method thereof. Background Polyamide-6 (PA 6) is widely used in the fields of electronic appliances, automobile parts, engineering structural members, and the like because of its high mechanical strength, good wear resistance, chemical resistance, and excellent processability. However, PA6 belongs to a flammable polymer material, and has a certain fire safety hazard in the use process, and is generally required to be modified by flame retardance to meet the requirements of relevant safety standards. In the traditional PA6 flame-retardant system, halogen-containing flame retardant has been widely used because of higher flame-retardant efficiency, but the halogen-containing flame retardant is easy to release toxic and corrosive gases and generate a large amount of smoke in the combustion process, and has been gradually limited by environmental protection regulations and safety requirements. Therefore, the development of halogen-free flame retardant nylon materials has become an important direction of industry development. At present, a halogen-free flame-retardant PA6 system mainly adopts a phosphorus flame retardant or a nitrogen flame retardant or an inorganic flame retardant filler. However, the flame-retardant system generally needs higher addition amount to achieve the ideal flame-retardant effect, and the problems of material mechanical property reduction, melt fluidity deterioration, processing stability reduction and the like are easily caused, and particularly, the problem of insufficient interfacial compatibility is more prominent under the condition that reinforcing fillers exist. Meanwhile, the modification mode of PA6 in the prior art is concentrated on a single means, such as improving the reactivity through grafting modification or adjusting a multiphase interface through a compatilizer, but effective coordination is difficult to form between molecular structure regulation and control and the synergism of a multiphase system, so that the comprehensive improvement of the halogen-free nylon composite material in the aspects of flame retardance, mechanical property and processability is limited. The organic micromolecules are mostly used as stabilizers, lubricants or auxiliary additives in a nylon composite material system, and the roles of the organic micromolecules in the aspects of interface regulation, structure coordination and performance regulation in a halogen-free flame-retardant PA6 system are not systematically researched and fully applied. Therefore, the existing halogen-free PA6 composite material still faces a certain technical bottleneck in the aspect of realizing the synergy of high flame retardant level and high comprehensive performance. Disclosure of Invention In order to solve the problems that the flame retardant efficiency, the mechanical property and the processing property of the halogen-free flame retardant polyamide-6 material in the background art are difficult to consider, and the interface compatibility of a multiphase system is insufficient, the invention aims to provide a polyamide-6-based reinforced halogen-free nylon composite material and a preparation method thereof. The invention adopts the synergistic modification of maleic anhydride and 3-aminopropyl triethoxy silane to polyamide-6, introduces a specific organic micromolecular function regulator on the basis, and simultaneously cooperates with a halogen-free flame retardant, reinforcing filler, a compatilizer, an antioxidant and a processing aid to construct a multi-component synergistic halogen-free nylon composite material system. The invention can meet the halogen-free flame retardant requirement and simultaneously realize the comprehensive improvement of the flame retardant property, the mechanical property and the processing stability of the material. The aim of the invention can be achieved by the following technical scheme: The halogen-free nylon composite material comprises, by weight, 660-80 parts of a synergistic modified polyamide-6, 1-5 parts of an organic small molecule function regulator, 10-25 parts of a halogen-free flame retardant, 5-20 parts of a reinforcing filler, 1-5 parts of a compatilizer, 0.1-1.0 part of an antioxidant and 0.1-2.0 parts of a processing aid, wherein the synergistic modified polyamide-6 is obtained by modifying the synergistic effect of maleic anhydride and 3-aminopropyl triethoxysilane under the condition of melting or reaction, and the synergistic modified polyamide-6 simultaneously introduces an anhydride reactive structure and a siloxane polarity regulating structure on a molecular chain, so that the interface reaction capability and multiphase synergistic compatibili