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CN-122011284-A - Polypropylene composite material with high selectivity and infrared transmission and preparation method thereof

CN122011284ACN 122011284 ACN122011284 ACN 122011284ACN-122011284-A

Abstract

The invention relates to the technical field of high polymer materials, in particular to a polypropylene composite material with high selectivity and infrared transmission and a preparation method thereof, comprising the following steps of S1, premixing and dipping a polypropylene matrix, a fluorine-containing acrylic ester monomer, an epoxy-containing acrylic ester monomer, an initiator and an antioxidant to obtain a premix; S2, placing the premix into a double-screw extruder, extruding, cooling and granulating to obtain the product. According to the technical scheme provided by the invention, the polypropylene composite material with high infrared transmittance, high visible light shielding rate, high selectivity coefficient and good mechanical property and processability is prepared through the co-design and reaction extrusion process of the fluorine-containing acrylate monomer and the epoxy acrylate monomer.

Inventors

  • WANG XIANGLEI
  • LI TIANZE

Assignees

  • 天津市佰盟科技发展有限公司

Dates

Publication Date
20260512
Application Date
20260306

Claims (10)

  1. 1. A method for preparing a polypropylene composite material with high selective infrared transmission, which is characterized by comprising the following steps: s1, premixing and dipping a polypropylene matrix, a fluorine-containing acrylic ester monomer, an epoxy-containing acrylic ester monomer, an initiator and an antioxidant to obtain a premix; s2, placing the premix into a double-screw extruder, extruding, cooling and granulating to obtain a polypropylene composite material with high selectivity and infrared transmission; Wherein the fluorine-containing acrylate monomer is selected from trifluoroethyl methacrylate or hexafluorobutyl methacrylate, and the epoxy-containing acrylate monomer is selected from glycidyl methacrylate or glycidyl acrylate.
  2. 2. The method for producing a polypropylene composite material having high selectivity for infrared transmission according to claim 1, wherein the amount of the fluorinated acrylate monomer used in the step S1 is 8 to 18 parts by weight and the amount of the epoxy acrylate monomer used is 3 to 8 parts by weight based on 100 parts by weight of the mass of the polypropylene matrix.
  3. 3. The method for preparing a polypropylene composite material with high selectivity of infrared transmission according to claim 1, wherein the amount of the initiator in the step S1 is 0.3 to 0.8wt% of the mass of the polypropylene matrix, and the total amount of the antioxidants is 0.1 to 0.5wt% of the mass of the polypropylene matrix.
  4. 4. A method for preparing a polypropylene composite material with high selectivity of infrared transmission according to claim 1 or 3, wherein the initiator in the step S1 is selected from benzoyl peroxide, and the antioxidant is selected from at least one of antioxidant 1010, antioxidant 1076, antioxidant 168 and antioxidant DSTP.
  5. 5. The method for preparing a polypropylene composite material having high selectivity for infrared transmission according to claim 1, wherein the conditions of the pre-mixing and the impregnation treatment in the step S1 are that the temperature is 40-50 ℃, the stirring speed is 200-400rpm, and the impregnation time is 30-120min.
  6. 6. The method for producing a polypropylene composite material having high selectivity for infrared transmission according to claim 1, wherein the twin-screw extruder in step S2 has a screw aspect ratio L/D of 36 to 44, and the temperature of each stage from the feed port to the head is set to 160 to 190 ℃ and the screw rotation speed is set to 200 to 400rpm.
  7. 7. The method for producing a polypropylene composite material having high selectivity for infrared transmission according to claim 1, wherein the twin-screw extruder in step S2 is further provided with a vacuum vent at the rear of the reaction section, and a vacuum degree of (-0.06) - (-0.10) MPa is maintained at the vacuum vent during the extrusion.
  8. 8. The method for producing a polypropylene composite material having high selectivity of infrared transmission according to claim 1, wherein the melt extruded from the twin-screw extruder in step S2 is solidified by cooling in a cooling water tank, wherein the water temperature of the cooling water tank is controlled to 10-25 ℃, and the solidified strands after cooling are cut into pellets having a length of 2-5mm by a pelletizer.
  9. 9. A polypropylene composite material having high selectivity for infrared transmission produced by the production process according to any one of claims 1 to 8.
  10. 10. A selective infrared transmission device comprising the polypropylene composite having high selective infrared transmission according to claim 9.

Description

Polypropylene composite material with high selectivity and infrared transmission and preparation method thereof Technical Field The invention relates to the technical field of high polymer materials, in particular to a polypropylene composite material with high selectivity and infrared transmission and a preparation method thereof. Background The high-selectivity infrared transmission material is a high polymer material which can realize a specific thermal management function by intelligently screening incident light radiation, and is characterized in that the response of the material to infrared light with different wavelengths can be accurately regulated, for example, infrared wave bands beneficial to specific application (such as near infrared light in solar spectrum or middle-far infrared wave bands corresponding to thermal radiation of a room-temperature object) can be efficiently transmitted, and other irrelevant or harmful infrared radiation can be effectively blocked or reflected. The characteristic enables the glass to have important application potential in the fields of intelligent building energy-saving windows, agricultural spectrum selective covering films, industrial thermal process control, infrared stealth and the like. Polypropylene is a high-crystallinity thermoplastic resin, has the outstanding advantages of light weight, chemical corrosion resistance, easy processing and forming, low cost and the like, and is widely applied to the fields of packaging, automobiles, daily products and the like. However, unmodified pure polypropylene does not possess infrared spectral selectivity itself, and exhibits broad spectrum, passive transmission or absorption behavior for infrared light in different wavebands. The invention patent with the publication number of CN110240750A discloses a high-glossiness polypropylene material with near infrared permeability and a preparation method thereof, wherein the high-glossiness polypropylene material comprises, by mass, 100 parts of polypropylene, 0.5-2 parts of infrared transmission enhancer, 0.3-2 parts of nucleating agent, 0.2-0.5 part of crystallization inhibitor and 0.3-2 parts of dispersing agent. The infrared transmittance of the material reaches more than 90%, the glossiness can reach more than 85%, and the material can be applied to intelligent home shells, remote controller shells, infrared sensor shells and the like. In the prior art, many methods for obtaining spectrum selectivity by adding functional nano-filler can obviously sacrifice the transparency of a material in a visible light region or cause serious haze while improving the transmittance or the blocking rate of a specific wave band, so that the application of the material in the field of windows requiring high visual definition is greatly limited. Meanwhile, the introduction of a large amount of inorganic filler generally damages the inherent flexibility and impact resistance of the polypropylene matrix, so that the composite material becomes brittle and the mechanical property is reduced. In addition, in complex photo-thermal wet environments (such as long-term outdoor sun and rain), the organic-inorganic interface in the composite may be degraded by the mismatch in thermal expansion coefficients, resulting in performance degradation. Certain functional nanoparticles (particularly metal particles) may present photocatalytic or oxidative problems affecting the long-term optical stability of the material. Disclosure of Invention In order to solve the problems mentioned in the background art, the invention provides a polypropylene composite material with high selectivity and infrared transmission and a preparation method thereof. In order to achieve the above purpose, the present invention adopts the following technical scheme: the invention provides a preparation method of a polypropylene composite material with high selectivity of infrared transmission, which is characterized by comprising the following steps: s1, premixing and dipping a polypropylene matrix, a fluorine-containing acrylic ester monomer, an epoxy-containing acrylic ester monomer, an initiator and an antioxidant to obtain a premix; S2, placing the premix into a double-screw extruder, and performing melt extrusion, cooling and granulating to obtain a polypropylene composite material with high selectivity and infrared transmission; Wherein the fluorine-containing acrylate monomer is selected from trifluoroethyl methacrylate or hexafluorobutyl methacrylate, and the epoxy-containing acrylate monomer is selected from glycidyl methacrylate or glycidyl acrylate. The polypropylene matrix is homo-or co-polypropylene, preferably having a melt flow rate (230 ℃ C./2.16 kg) of 2-50g/10min. Specifically, in the step S1, the amount of the fluorine-containing acrylate monomer is 8-18 parts by weight, and the amount of the epoxy-containing acrylate monomer is 3-8 parts by weight, based on 100 parts by weight of the mass of the polypropylene