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CN-121991505-A - Glass fiber reinforced nylon 66 composite material for heat insulation strip and preparation method thereof

CN121991505ACN 121991505 ACN121991505 ACN 121991505ACN-121991505-A

Abstract

The invention discloses a glass fiber reinforced nylon 66 composite material for a heat insulation strip and a preparation method thereof, and relates to the technical field of nylon materials. The glass fiber reinforced nylon 66 composite material for the heat insulation strip at least comprises, by mass, 100 parts of nylon 66 resin, 25-35 parts of modified glass fiber coated with 1, 2-polybutadiene/maleic anhydride grafted polyolefin elastomer/P-N flame retardant, 1-2 parts of montmorillonite-graphene oxide aerogel composite powder, 0.1-0.5 part of antioxidant, 0.1-0.5 part of stabilizer and 0.1-0.3 part of lubricant. The glass fiber reinforced nylon 66 composite material for the heat insulation strip has excellent dimensional stability, high flame retardant efficiency and long-acting heat insulation, and can be used for preparing heat insulation strips in the fields of building doors and windows and automobiles.

Inventors

  • ZHANG XIAOLONG
  • LIU HAIWEN
  • LIU SHENGZHEN
  • JIANG JIANMING

Assignees

  • 长沙争明新材料有限公司
  • 重庆争明新材料有限公司

Dates

Publication Date
20260508
Application Date
20260410

Claims (9)

  1. 1. The glass fiber reinforced nylon 66 composite material for the heat insulation strip is characterized by at least comprising the following raw materials in parts by mass: 100 parts of nylon 66 resin, 25-35 parts of modified glass fiber coated with 1, 2-polybutadiene/maleic anhydride grafted polyolefin elastomer/P-N flame retardant, 1-2 parts of montmorillonite-graphene oxide aerogel composite powder, 0.1-0.5 part of antioxidant, 0.1-0.5 part of stabilizer and 0.1-0.3 part of lubricant.
  2. 2. The glass fiber reinforced nylon 66 composite for heat insulation strips according to claim 1, wherein the preparation method of the 1, 2-polybutadiene/maleic anhydride grafted polyolefin elastomer/P-N flame retardant coated modified glass fiber at least comprises the following steps: Adding the glass fiber into hydrochloric acid solution, stirring, centrifuging, washing and drying to obtain activated glass fiber; Dispersing the activated glass fiber in deionized water, adding ammonia water and gamma-methacryloxypropyl trimethoxy silane, stirring, centrifuging, washing and drying to obtain double bond modified glass fiber; adding maleic anhydride into dimethyl sulfoxide for dissolution, adding melamine for reaction, adding 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide for heating reaction, washing and drying after the reaction to obtain a P-N flame retardant; Adding the double bond modified glass fiber, the 1, 2-polybutadiene, the maleic anhydride grafted polyolefin elastomer, the P-N flame retardant and the initiator into a solvent, heating for reaction, centrifuging, washing and drying to obtain the 1, 2-polybutadiene/maleic anhydride grafted polyolefin elastomer/P-N flame retardant coated modified glass fiber.
  3. 3. The glass fiber reinforced nylon 66 composite for heat insulating strips according to claim 2, wherein the concentration of the hydrochloric acid is 10-12wt%, the concentration of the ammonia water is 25-28wt%, and the mass ratio of the activated glass fiber to the gamma-methacryloxypropyl trimethoxysilane is 100:2-3.
  4. 4. The glass fiber reinforced nylon 66 composite for a heat insulation tape according to claim 2, wherein the mass ratio of the maleic anhydride, the melamine and the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 13-16:5-8:30-35.
  5. 5. The glass fiber reinforced nylon 66 composite for a heat insulation tape according to claim 2, wherein the mass ratio of the double bond modified glass fiber, the 1, 2-polybutadiene, the maleic anhydride grafted polyolefin elastomer and the P-N flame retardant is 100:2-3:5-8:1-3, the grafting ratio of the maleic anhydride in the maleic anhydride grafted polyolefin elastomer is 1.0-1.5%, and the MFR is 0.5-2.5g/10min.
  6. 6. The glass fiber reinforced nylon 66 composite for heat insulation strips according to claim 1, wherein the preparation method of the montmorillonite-graphene oxide aerogel composite powder at least comprises the following preparation steps: dispersing montmorillonite in acetone solution, adding gamma-aminopropyl triethoxysilane, stirring, washing, centrifuging and drying to obtain modified montmorillonite; Dispersing graphene oxide aerogel in an acetone solution, adding gamma-aminopropyl triethoxysilane, stirring, washing, centrifuging and drying to obtain modified graphene oxide aerogel; and mixing and stirring the dispersion liquid of the modified montmorillonite and the dispersion liquid of the modified graphene oxide aerogel, washing, centrifuging and drying to obtain montmorillonite-graphene oxide aerogel composite powder.
  7. 7. The glass fiber reinforced nylon 66 composite for heat insulation strips according to claim 6, wherein the mass ratio of the montmorillonite to the gamma-aminopropyl triethoxysilane is 10:1-2.5, the mass ratio of the graphene oxide aerogel to the gamma-aminopropyl triethoxysilane is 10:0.3-1.5, and the mass ratio of the modified montmorillonite to the modified graphene oxide aerogel is 2-3:1.
  8. 8. The glass fiber reinforced nylon 66 composite for heat insulating strips according to claim 1, wherein the antioxidant is at least one of hindered phenol antioxidants or phosphite antioxidants, the stabilizer is at least one of metal salt stabilizers, phosphite stabilizers or aromatic amine stabilizers, and the lubricant is at least one of fatty acid lubricants, fatty acid amide lubricants or ester lubricants.
  9. 9. The method for preparing glass fiber reinforced nylon 66 composite material for heat insulation strips according to any one of claims 1 to 8, comprising at least the following steps: nylon 66 resin, 1, 2-polybutadiene/maleic anhydride grafted polyolefin elastomer/P-N flame retardant coated modified glass fiber, montmorillonite-graphene oxide aerogel composite powder, an antioxidant, a stabilizer and a lubricant are added into a high-speed mixer to be mixed, so as to obtain a premix; And adding the premix into a double-screw extruder, and carrying out melt blending, extrusion, cooling and granulating to obtain the glass fiber reinforced nylon 66 composite material for the heat insulation strip.

Description

Glass fiber reinforced nylon 66 composite material for heat insulation strip and preparation method thereof Technical Field The invention relates to the technical field of nylon materials, in particular to a glass fiber reinforced nylon 66 composite material for a heat insulation strip and a preparation method thereof. Background The heat insulating strip is a core heat insulating component of the structures such as a broken bridge aluminum door window, an automobile door window frame, a rail transit carriage and the like, and the performance of the heat insulating strip directly determines the energy saving efficiency and the service life of the whole equipment. At present, the mainstream heat insulation strip material in the market is glass fiber reinforced nylon 66 composite material which has high strength and certain heat insulation, can replace the traditional PVC heat insulation strip and metal heat insulation strip, and is widely applied to the fields of building energy conservation, automobile weight reduction and the like. Nylon 66 has higher melting point and mechanical property, but nylon 66 resin itself contains amide bond, and saturated water absorption rate is high, and easy swelling deformation takes place after the moisture absorption, leads to the heat insulating strip to be increased with door and window section bar assembly clearance, and sealing performance reduces, especially in the high humid environment of south, the long-term use easily appears oozing water, air leakage problem. And nylon 66 resin has poor dimensional stability and is easy to deform, and glass fiber is often added to strengthen the material in application. The interface binding force of glass fiber and nylon 66 is poor, and most is along the longitudinal distribution of heat insulating strip when blending extrusion, leads to horizontal tensile strength poor, can't satisfy the operation requirement, and in addition, the addition of glass fiber plays the effect of "candle stick" and makes the burning grade of heat insulating strip reduce. In the prior art, flame retardant performance of the nylon heat insulation strip is improved by adding the flame retardant, but blending of the flame retardant still cannot meet the flame retardant requirement, and the addition of excessive flame retardant reduces mechanical property and mechanical property of the material, and emission of dense smoke and harmful substances during flame retardance is unfavorable for environmental protection. The interfacial bonding performance of the glass fiber and nylon 66 can be improved to a certain extent by adding the compatilizer during blending, but the conditions of poor transverse tensile property, low impact strength and the like still occur, and the floating fiber easily occurs to cause the surface of the heat insulation strip to be rough, the mechanical property is influenced, so that the service life of the heat insulation strip is not long. Therefore, how to prepare a heat insulation strip with good flame retardant effect, low water absorption and excellent heat insulation effect is a problem to be solved urgently. Disclosure of Invention The invention aims to provide a glass fiber reinforced nylon 66 composite material for a heat insulation strip and a preparation method thereof, which solve the following technical problems: The existing glass fiber reinforced nylon 66 composite material is used for producing heat insulation strips, and has the problems of insufficient heat insulation effect, poor flame retardant effect and high water absorption rate. The aim of the invention can be achieved by the following technical scheme: the glass fiber reinforced nylon 66 composite material for the heat insulation strip at least comprises the following raw materials in parts by mass: 100 parts of nylon 66 resin, 25-35 parts of modified glass fiber coated with 1, 2-polybutadiene/maleic anhydride grafted polyolefin elastomer/P-N flame retardant, 1-2 parts of montmorillonite-graphene oxide aerogel composite powder, 0.1-0.5 part of antioxidant, 0.1-0.5 part of stabilizer and 0.1-0.3 part of lubricant. As a further scheme of the invention, the preparation method of the 1, 2-polybutadiene/maleic anhydride grafted polyolefin elastomer/P-N flame retardant coated modified glass fiber at least comprises the following steps: Adding the glass fiber into hydrochloric acid solution, stirring, centrifuging, washing and drying to obtain activated glass fiber; Dispersing the activated glass fiber in deionized water, adding ammonia water and gamma-methacryloxypropyl trimethoxy silane, stirring, centrifuging, washing and drying to obtain double bond modified glass fiber; adding maleic anhydride into dimethyl sulfoxide for dissolution, adding melamine for reaction, adding 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide for heating reaction, washing and drying after the reaction to obtain a P-N flame retardant; Adding the double bond modified glass fiber, the 1,