Search

CN-116790228-B - Phase change microcapsule and PVC ornamental strip with temperature control, electromagnetic shielding and flame-retardant smoke suppression functions

CN116790228BCN 116790228 BCN116790228 BCN 116790228BCN-116790228-B

Abstract

The invention relates to the field of high polymer materials, and discloses a phase-change microcapsule and a PVC decorative strip with temperature control, electromagnetic shielding, flame retardance and smoke suppression functions. The invention takes ferroferric oxide as a shell material, and synthesizes the phase-change microcapsule after coating phase-change alkane with phase-change function. The ferroferric oxide not only has the electromagnetic shielding function of wave absorbing performance, but also has the flame-retardant smoke-suppressing function, and compared with the conventional high polymer shell material, the ferroferric oxide has better heat conductivity, so that the response speed of the phase-change microcapsule to the ambient temperature is faster. Therefore, the phase change microcapsule is used as a filler to be compounded with PVC, and the obtained PVC decorative strip has the functions of high-efficiency temperature control, electromagnetic shielding, flame retardance and smoke suppression.

Inventors

  • GONG PINZHONG
  • ZHANG HAITAO
  • XU BIN

Assignees

  • 华鸿画家居股份有限公司

Dates

Publication Date
20260512
Application Date
20230627

Claims (10)

  1. 1. The preparation method of the phase-change microcapsule with the functions of temperature control, electromagnetic shielding and flame retardance and smoke suppression is characterized by comprising the following steps of: (a) Heating and melting phase-change alkane; (b) Dripping sodium dodecyl benzene sulfonate-ethylene glycol solution consisting of 1.2-1.6g sodium dodecyl benzene sulfonate and 30-50mL ethylene glycol into melted 1.2-1.6g phase-change alkane, dripping polyethylene glycol-ethylene glycol solution consisting of 1.6-2.0g polyethylene glycol and 30-50mL ethylene glycol into the obtained mixed solution, and heating and stirring to prepare microemulsion; (c) Adding ferric trichloride hexahydrate into the microemulsion according to the dosage ratio of 0.54-0.81g to 80-100mL, heating and stirring uniformly; (d) Adding anhydrous sodium carbonate into the microemulsion obtained in the step (c), heating and stirring uniformly; (e) Carrying out hydrothermal reaction on the liquid obtained in the step (d); (f) And (3) centrifugally separating, washing and drying the reaction product obtained in the step (e) to obtain the phase-change microcapsule of the ferroferric oxide coated phase-change alkane, wherein the phase-change microcapsule comprises the phase-change alkane serving as a core material and the ferroferric oxide which is synthesized in situ and coated on the surface of the phase-change alkane.
  2. 2. The method of claim 1, wherein the phase-change alkane comprises one or more of octadecane, eicosane, docosyl, tetracosyl, hexacosyl and octacosyl.
  3. 3. The method of claim 1, wherein in step (b), the polyethylene glycol has a molecular weight of 6000 to 10000.
  4. 4. The method of claim 1, wherein in step (d), the ratio of anhydrous sodium carbonate to ferric trichloride hexahydrate is 0.48-2.04 g/0.54-0.81 g.
  5. 5. Use of the phase change microcapsules obtainable by the process according to any one of claims 1 to 4 for the preparation of PVC decorative strips.
  6. 6. A PVC decorative strip is characterized by comprising the following raw materials, by weight, 90-100 parts of PVC resin and 20-40 parts of phase-change microcapsules obtained by the preparation method according to one of claims 1-4.
  7. 7. The PVC decorative strip according to claim 6, further comprising 4-5 parts of calcium zinc stabilizer, 0.1-0.3 part of stearic acid, 0.1-0.3 part of paraffin wax, 0.1-0.3 part of monoglyceride, 1-3 parts of impact modifier and 8-12 parts of chlorinated polyethylene.
  8. 8. A method of making a PVC decorative strip as in claim 7 comprising the steps of: (1) Mixing all the raw materials uniformly; (2) Melting and extruding the uniformly mixed raw materials in a single screw extruder; (3) And (3) performing hot press molding on the extruded PVC lines, and cooling and shaping to obtain the PVC decorative strip with the functions of temperature control, electromagnetic shielding, flame retardance and smoke suppression.
  9. 9. The method of claim 8, wherein in the step (1), the materials are mixed by a high-speed mixer in the following order: (1.1) starting a high-speed mixer, and adding PVC resin at a rotating speed of 300-400 rpm; (1.2) adding a calcium zinc stabilizer, stearic acid and a monoglyceride at 55-65 ℃ and 1000-1200 rpm; (1.3) adding impact modifier, chlorinated polyethylene and phase change microcapsules at 80-90 ℃ and 1000-1200 rpm; (1.4) adding paraffin at 80-90 ℃ and 1000-1200 rpm; (1.5) discharging the raw material at a rotation speed of 100 to 200rpm at 90 to 100 ℃.
  10. 10. The process according to claim 8, wherein in step (2), the temperatures of the respective stages of the barrel of the single-screw extruder are set such that the feeding stage is 185 to 195 ℃, the compression stage is 180 to 190 ℃, the melting stage is 190 to 195 ℃, the metering stage is 170 to 180 ℃, and the extrusion stage is 190 to 210 ℃.

Description

Phase change microcapsule and PVC ornamental strip with temperature control, electromagnetic shielding and flame-retardant smoke suppression functions Technical Field The invention relates to the field of high polymer materials, in particular to a phase-change microcapsule and a PVC decorative strip with temperature control, electromagnetic shielding, flame retardance and smoke suppression functions. Background With the development of science and technology and the continuous improvement of living standard of people, the variety and the number of electric appliances used by people are increased, the electric load is increased sharply, the laying density of electric wires in a building is increased greatly, and the electromagnetic radiation is increased. Electromagnetic interference generated by electromagnetic radiation not only affects the performance of electronic products, but also causes serious harm to human beings and other organisms. PVC electric wire shielding ornamental strip has advantages such as handsome in appearance, installation are convenient, often use in indoor threading in the building, improve indoor wiring's aesthetic property. However, PVC has good penetrability to electromagnetic waves, and cannot shield generated electromagnetic waves and external electromagnetic interference. In addition, the high-load capacitor is easy to heat the wire, and potential safety hazards such as fire disaster and the like are generated. More importantly, the PVC material is easy to release toxic gases such as chlorine and the like when being burnt and pyrolyzed, and seriously endangers health. Researches show that the ferroferric oxide is not only a high-efficiency wave-absorbing material, but also has the functions of flame retardance and smoke suppression in the PVC combustion process. For example, yao et al [Yao K,Gong J,Tian N,et a1.Flammability properties and electromagnetic interference shielding of PVC/graphene composites containing Fe3O4nanoparticles[J].RSC Advances,2015,5(40)：31910-31919.], by compounding ferroferric oxide, graphene and PVC, obtain a high-efficiency flame-retardant electromagnetic shielding composite material, and the result shows that the electromagnetic shielding efficiency of the composite material in the X wave band is as high as 13dB, and meanwhile, when PVC is obviously inhibited from pyrolysis combustion, toxic smoke is generated, so that the UL-94 flame retardant grade of the PVC is increased from V-1 to V-0. However, the ferroferric oxide can generate heat due to hysteresis heat effect in the wave absorbing process, and the PVC electric wire shields the electric wire in the decorative strip and can release a large amount of heat during working, so that the temperature is increased, and potential safety hazards such as fire disaster are caused. In view of this, it is necessary to develop a method for preparing a PVC molding having temperature control, flame retarding and electromagnetic shielding functions. The phase change microcapsule keeps the temperature thereof within a certain range by absorbing or releasing latent heat, and has excellent temperature regulation capability. Some students often use the polymer as a filler to further compound with the polymer, so that the polymer is endowed with heat storage and temperature regulation performances. For example, amaral and [Amaral C,Gama N V,Mohseni F,et al.Development of structural layers PVC incorporating phase change materials for thermal energy storage[J].Applied Thermal Engineering,2020,179.] blend and mold phase-change microcapsules of commercial basf company with PVC to obtain a composite material having heat storage and temperature control capability. However, the phase-change microcapsule takes high polymer PMMA as a shell material, and has low heat conductivity coefficient, so that the response speed of the microcapsule-containing PVC composite material to the ambient temperature is low. The heat conductivity of the ferroferric oxide serving as the metal oxide is far higher than that of the high polymer, so that if the ferroferric oxide serving as a shell material is directly coated with the phase change material to synthesize the phase change microcapsule, and the phase change microcapsule serving as a filler is compounded with PVC, the high-efficiency temperature control capability of the PVC decorative strip can be provided, and meanwhile, the decorative strip has the electromagnetic shielding, flame-retardant and smoke-suppressing functions. Disclosure of Invention In order to solve the technical problems, the invention provides a phase-change microcapsule and a PVC decorative strip with temperature control, electromagnetic shielding, flame retarding and smoke suppressing functions. According to the invention, the phase-change alkane is directly coated by taking the ferroferric oxide as a shell material to synthesize the phase-change microcapsule, and the phase-change alkane is used as a filler to be comp