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CN-121086527-B - Impact-resistant high-heat-conductivity polyphenylene sulfide composite material and preparation method thereof

CN121086527BCN 121086527 BCN121086527 BCN 121086527BCN-121086527-B

Abstract

The invention discloses an impact-resistant high-heat-conductivity polyphenylene sulfide composite material and a preparation method thereof, and relates to the technical field of plastic processing. The preparation method comprises the following steps of S1, preparing a highly oriented PPS fiber insert, S2, preparing an impact-resistant high-heat-conductivity PPS composite material. The invention provides an impact-resistant high-heat-conductivity PPS composite material and a preparation method thereof, wherein the high-melt-viscosity high-temperature-resistant aromatic polyamide is adopted to improve the viscoelasticity of PPS resin, and the functionalized polysulfone-based resin is used as a compatibilizer to enhance the interfacial compatibility of PPS/aromatic polyamide, so that the stretchability and the stretching orientation degree of PPS are improved; and obtaining PPS composite fiber by using a melt spinning machine, and establishing a fiber solid-phase high-power stretching-annealing forming process to obtain the high-toughness and highly-oriented PPS composite fiber material.

Inventors

  • LIU HUI
  • Fang Guangyong

Assignees

  • 古道尔材料科技(滁州)有限公司

Dates

Publication Date
20260508
Application Date
20251009

Claims (5)

  1. 1. The preparation method of the impact-resistant high-heat-conductivity polyphenylene sulfide composite material is characterized by comprising the following steps of: S1, preparing a highly oriented PPS fiber insert, namely (1) reacting polysulfone-based resin, a first antioxidant, an initiator and an active monomer to obtain a functionalized polysulfone-based resin compatibilizer, (2) mixing PPS, aromatic polyamide, the functionalized polysulfone-based resin compatibilizer and a second antioxidant and then carrying out melt extrusion to obtain composite resin particles, (3) carrying out melt spinning on the composite resin particles to obtain a fiber sample, carrying out solid-phase superstretching orientation on the fiber sample, carrying out high-temperature annealing to obtain highly oriented PPS fibers, and (4) aligning the highly oriented PPS fibers in multiple directions, and bundling to obtain the highly oriented PPS fiber insert; S2, preparing an impact-resistant high-heat-conductivity PPS composite material, namely uniformly mixing PPS and a third antioxidant, and then carrying out injection molding on the mixture and a highly-oriented PPS fiber insert to obtain the impact-resistant high-heat-conductivity PPS composite material; In the step S1, the stretching multiplying power of the fiber sample for solid-phase super stretching orientation is 1500% -2500%; in the step S1, the highly oriented PPS fiber insert is obtained by aligning 1000-10000 highly oriented PPS fibers along multiple directions, bundling the highly oriented PPS fibers into a specific shape; the active monomer is selected from one of hydroxyethyl acrylate, hydroxypropyl methacrylate, hydroxyethyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, ethyl methacrylate, 2-ethylhexyl acrylate, methyl methacrylate, glycidyl methacrylate, ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, allyl methacrylate, dimethylaminoethyl methacrylate and silicone methacrylate; the initiator is selected from one of azodiisobutyronitrile, benzoyl peroxide, dicumyl peroxide, diisopropyl peroxydicarbonate, dicyclohexyl peroxydicarbonate, bis (4-tert-butylcyclohexyl) peroxydicarbonate, bis (2-ethylhexyl) peroxydicarbonate, dimethyl peroxydicarbonate, dibenzoyl peroxydicarbonate and azodiisoheptonitrile; In the step S1, 100 parts by weight of polysulfone-based resin, 0.5-3 parts by weight of first antioxidant, 0.5-5 parts by weight of initiator and 5-30 parts by weight of active monomer are added into an internal mixer to react for 10-30min at 300-380 ℃ to obtain composite resin particles, wherein 100 parts by weight of PPS, 10-50 parts by weight of aromatic polyamide, 5-30 parts by weight of functionalized polysulfone-based resin compatibilizer and 0.5-5 parts by weight of second antioxidant are mixed and then added into a double screw extruder to be subjected to melt extrusion to obtain the composite resin particles; in the step S2, 100 parts of PPS and 0.5-5 parts of a third antioxidant are uniformly mixed in parts by weight, and then added into a charging barrel of an injection machine, and the highly oriented PPS fiber insert is preheated for 20-40min at 160-220 ℃ and then is flatly laid in a die cavity of the injection machine for injection molding, wherein the injection temperature is 330-380 ℃, the nozzle temperature is 310-360 ℃, the die temperature is 160-220 ℃, and the injection time is 80-150 MPa.
  2. 2. The preparation method of the impact-resistant high-heat-conductivity polyphenylene sulfide composite material according to claim 1, wherein in the step S1, the polysulfone-based resin is one of polyethersulfone, polyphenylsulfone and polyarylethersulfone, and the first antioxidant, the second antioxidant and the third antioxidant are one of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid octadecyl ester, 2, 6-di-tert-butyl-p-cresol, tri (2, 4-di-tert-butylphenyl) phosphite, bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite, dilauryl thiodipropionate and N-isopropyl-N' -phenyl p-phenylenediamine.
  3. 3. The method for preparing an impact-resistant high-thermal-conductivity polyphenylene sulfide composite material according to claim 1, wherein in the step S1, the aromatic polyamide is selected from one of poly (hexamethylene terephthalamide), poly (hexamethylene isophthalamide)/hexamethylene terephthalamide copolymer, poly (hexamethylene terephthalamide), poly (butylene terephthalamide)/hexamethylene diamine copolymer, poly (hexamethylene phthalamide) and poly (hexamethylene terephthalamide).
  4. 4. The method for preparing the impact-resistant high-heat-conductivity polyphenylene sulfide composite material according to claim 1, wherein in the step S1, the fiber sample is obtained by melt spinning composite resin particles by a melt spinning machine under the conditions of an extrusion temperature of 320-380 ℃ and a screw rotating speed of 120-200rpm, the melt spinning temperature is 320-380 ℃ and a winding speed of 100-200m/min, the highly-oriented PPS fiber is obtained by fixing the fiber sample on a universal material testing machine, performing solid-phase hyperstretching orientation at 120-200 ℃, stopping stretching after a stretching multiplying power reaches 1500% -2500%, and performing high-temperature annealing in an oven at 230-250 ℃ for 1-3 h.
  5. 5. An impact-resistant high-heat-conductivity polyphenylene sulfide composite material, which is characterized by being prepared by the preparation method of the impact-resistant high-heat-conductivity polyphenylene sulfide composite material as claimed in any one of claims 1 to 4.

Description

Impact-resistant high-heat-conductivity polyphenylene sulfide composite material and preparation method thereof Technical Field The invention relates to the technical field of plastic processing, in particular to an impact-resistant high-heat-conductivity polyphenylene sulfide composite material and a preparation method thereof. Background Polyphenylene Sulfide (PPS) is used as one of the resins with highest thermal stability in thermoplastic plastics, has higher mechanical strength and modulus, excellent flame retardance, corrosion resistance, electrical insulation and the like, and is widely used in the fields of electronics, petrochemical industry, automobiles, precision machinery, aerospace, national defense and the like. However, PPS has defects of low thermal conductivity, poor toughness, and the like, which severely restricts the application in the fields of electronic appliances, power batteries, and the like. The prior researches generally adopt the addition of high heat conduction filler to improve the heat conductivity of the PPS resin, such as compounding magnesium oxide particles with the PPS resin, so that the heat conductivity of the composite material is improved from 0.3W/m.K of pure PPS resin to 1.93W/m.K, the prepared PPS composite material has good high heat conduction and heat dissipation performance by introducing chopped glass fibers, graphite and the like into a PPS resin composite system through Chinese patent CN202310488007.1, and the heat conductivity of the PPS composite material can be obviously improved by introducing high heat conduction filler by 15.35W/m.K by compounding the PPS resin with graphite/silicon carbide/graphene and/boron nitride and the like through Chinese patent CN 202011416113.1. In summary, most of fillers used for improving the heat conduction performance of PPS resins are inorganic fillers such as magnesium oxide, graphite, graphene, silicon carbide, etc., which have poor compatibility with PPS resins and are prone to interfacial debonding, which leads to degradation of the composite material performance and limits practical application. Disclosure of Invention The invention aims to provide an impact-resistant high-heat-conductivity polyphenylene sulfide composite material and a preparation method thereof, aiming at the defects of the prior art, and is characterized in that firstly, high melt viscosity and high temperature resistant aromatic polyamide is adopted to improve the viscoelasticity of PPS resin, and functionalized polysulfone-based resin is used as a compatibilizer to enhance the interfacial compatibility of PPS/aromatic polyamide, so that the stretchability and the stretching orientation degree of PPS are improved; and obtaining PPS composite fiber by using a melt spinning machine, and establishing a fiber solid-phase high-power stretching-annealing forming process to obtain the high-toughness and highly-oriented PPS composite fiber material. The molecular chains of the stretched PPS composite fiber are arranged in a highly oriented manner to form a continuous through phonon transmission path, so that phonon scattering is reduced, and rapid heat exchange and dissipation are realized. The oriented fiber is further clustered into an impact-resistant high-heat-conductivity insert, and the impact-resistant high-heat-conductivity PPS composite material is obtained through an injection molding process. The method specifically comprises the following technical scheme: in a first aspect, a method for preparing an impact-resistant high-thermal-conductivity polyphenylene sulfide composite material is provided, which comprises the following steps: S1, preparing a highly oriented PPS fiber insert, namely (1) reacting polysulfone-based resin, a first antioxidant, an initiator and an active monomer to obtain a functionalized polysulfone-based resin compatibilizer, (2) mixing PPS, aromatic polyamide, the functionalized polysulfone-based resin compatibilizer and a second antioxidant and then carrying out melt extrusion to obtain composite resin particles, (3) carrying out melt spinning on the composite resin particles to obtain a fiber sample, carrying out solid-phase superstretching orientation on the fiber sample, carrying out high-temperature annealing to obtain highly oriented PPS fibers, and (4) aligning the highly oriented PPS fibers in multiple directions, and bundling to obtain the highly oriented PPS fiber insert; S2, preparing the impact-resistant high-heat-conductivity PPS composite material, namely uniformly mixing PPS and a third antioxidant, and then carrying out injection molding on the mixture and the highly-oriented PPS fiber insert to obtain the impact-resistant high-heat-conductivity PPS composite material. In step S1, the fiber sample is subjected to solid-phase hyperstretching orientation at a stretching ratio of 1500% to 2500%. In step S1, the highly oriented PPS fiber insert is obtained by aligning 1000 to 10000 highly oriented PPS fibers