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CN-121975199-A - Composite heat-conducting rubber roller material and preparation method thereof

CN121975199ACN 121975199 ACN121975199 ACN 121975199ACN-121975199-A

Abstract

The invention provides a composite heat-conducting rubber roller material which is of an annular structure matched with a rubber roller metal core, and comprises, by weight, 20-30 parts of nitrile rubber, 10-15 parts of silicon rubber, 3-5 parts of 5-10 mu m-aluminum oxide, 2-4 parts of 10-20 mu m-flake graphite, 0.5-1 part of zinc stearate and 0.5-0.8 part of a vulcanizing agent, from outside to inside, 30-45 parts of silicon rubber and 5-8 parts of magnetic flake graphite, wherein the inner-layer interface-strengthening heat-conducting layer comprises liquid silicon rubber and an oriented heat-conducting fiber film, and the fiber in the oriented heat-conducting fiber film is radially coated on the outer side of the rubber roller metal in a high-orientation direction. The gelatin roller combines the heat conduction design of the three-layer structure, reduces the surface temperature fluctuation of the gelatin roller, and solves the product quality defect caused by uneven roller body temperature.

Inventors

  • QIAN LINGEN
  • SONG YONGCUN
  • QIAN ZHENHUA
  • ZHANG FUWEI
  • YU BANGYONG

Assignees

  • 苏州鼎立工业胶辊有限公司

Dates

Publication Date
20260505
Application Date
20251215

Claims (8)

  1. 1. The composite heat-conducting rubber roller material is characterized by being of an annular structure matched with a rubber roller metal core, and comprises, by weight, 20-30 parts of nitrile rubber, 10-15 parts of silicone rubber, 3-5 parts of 5-10 mu m micron aluminum oxide, 2-4 parts of 10-20 mu m flake graphite, 0.5-1 part of zinc stearate and 0.5-0.8 part of vulcanizing agent, wherein the outer compact heat-conducting layer, the middle heat-conducting layer and the inner interface strengthening heat-conducting layer are formed from outside to inside; The middle layer heat conduction layer comprises, by weight, 30-45 parts of silicon rubber and 5-8 parts of magnetic flake graphite; The inner layer interface reinforced heat conduction layer comprises liquid silicon rubber and an oriented heat conduction fiber membrane, and the fiber in the oriented heat conduction fiber membrane is radially coated on the outer side of the rubber roller metal in a high-orientation direction.
  2. 2. The method for preparing the composite heat-conducting rubber roller material according to claim 1, comprising the following steps: S1, adding nitrile rubber and silicon rubber into an internal mixer for banburying, sequentially adding micrometer alumina, flake graphite and zinc stearate, carrying out first mixing, finally adding a vulcanizing agent, carrying out second mixing and discharging, and adding the mixed material into a calender to prepare a rolled sheet with the thickness of 1mm, namely an outer compact heat conducting layer; s2, adding silicon rubber into an internal mixer for banburying, sequentially adding magnetic flake graphite, mixing and discharging, and then adding the mixed material into a calender to prepare a calendered sheet with the thickness of 0.5-1 mm; S3, placing the rolled sheet prepared in the step S2 in toluene steam to enable the sheet to be swelled, applying a magnetic field in the swelling process to enable the magnetic flake graphite in the sheet to be perpendicular to the surface layer of the sheet, taking out the sheet after swelling is finished, and solidifying after the solvent volatilizes to obtain a middle layer heat conducting layer; s4, dipping the oriented heat conduction fiber membrane into liquid silicon rubber, taking out and drying to obtain an inner layer interface reinforced heat conduction layer; And S5, carrying out hot-pressing compounding on the outer compact heat conducting layer prepared in the step S1, the middle heat conducting layer prepared in the step S3 and the inner interface reinforced heat conducting layer prepared in the step S4 to obtain the heat conducting rubber roller material.
  3. 3. The preparation method of the composite heat-conducting rubber roller material according to claim 2, wherein the banburying temperature in the step S1 is 80-90 ℃, the time is 3-6 min, the first mixing time is 8-12 min, and the second mixing time is 3-4 min.
  4. 4. The preparation method of the composite heat-conducting rubber roller material according to claim 2, wherein the banburying temperature in the step S2 is 80-90 ℃, the time is 3-6 min, and the mixing time is 8-12 min.
  5. 5. The preparation method of the composite heat-conducting rubber roller material is characterized in that the preparation method of the magnetic flake graphite is characterized in that ferrous sulfate solution is dripped into flake graphite dispersion liquid, uniformly stirred, subjected to hydrothermal reaction, heated to 180-200 ℃ at 4-5 ℃ per min, kept for 4 hours to obtain graphite loaded with ferric oxide, reduced by H 2 , heated to 400 ℃ at 8-10 ℃ per min and kept for 3 minutes to obtain the magnetic flake graphite.
  6. 6. The preparation method of the composite heat-conducting rubber roller material according to claim 2, wherein toluene vapor in the step S3 is obtained through rotary evaporation, the temperature of the vapor is 50-60 ℃, and the swelling time in the vapor is 3-5 h.
  7. 7. The method for preparing the composite heat-conducting rubber roller material according to claim 2, wherein the preparation method of the heat-conducting fiber film with orientation in the step S4 is as follows: Dissolving a single-arm carbon nano tube in DMF, uniformly dispersing by ultrasonic, refrigerating the dispersion liquid to 0 ℃, adding PMDA and ODA, wherein the molar ratio of the PMDA to the ODA is 1.02:1, continuously stirring for reaction to obtain the PAA solid content of 18-25wt%, and finally adding DMF for dilution until the PAA solid content in the spinning liquid is 12-15wt%; carrying out electrostatic spinning on the spinning solution, wherein the spinning voltage is 18kV, the spraying rate is 0.1mL/h, the distance between a receiving roller and a needle head is 15cm, and the rotating speed of the receiving roller is 2000-2500 r/min, so as to obtain an oriented electrostatic spinning film; And carrying out thermal imidization treatment on the electrostatic spinning film, wherein the heating program is that the temperature is kept at 70 ℃ for 1h, the temperature is kept at 150 ℃ for 1h, the temperature is kept at 250 ℃ for 1h, and the temperature is finally raised to 300 ℃ and kept for 15min, so that the oriented heat-conducting fiber film is obtained.
  8. 8. The preparation method of the composite heat-conducting rubber roller material according to claim 2, wherein the parameters of the hot-pressing compounding in the step S4 are that the temperature is 150-180 ℃, the pressure is 0.5-1 MPa, and the dwell time is 30-120S.

Description

Composite heat-conducting rubber roller material and preparation method thereof Technical Field The invention relates to the field of rubber materials, in particular to a composite heat-conducting rubber roller material and a preparation method thereof. Background The rubber roller is used as an indispensable key component in industrial production and is widely applied to various industries such as printing, papermaking, spinning, rubber, plastics and the like. The traditional rubber roller material mostly uses common rubber as a matrix, such as natural rubber, nitrile rubber and the like, the heat conductivity coefficient of the rubber is low, and is usually only between 0.1W/(m.K), and a large amount of heat generated in the high-speed running or long-time working process of the rubber roller is difficult to quickly emit. Taking the printing industry as an example, when the rubber roller continuously transmits ink, friction with printing plates, ink and other components can continuously generate heat, if heat cannot be dissipated in time, the surface temperature of the rubber roller can be rapidly increased, and the temperature can be increased to 50 ℃ or even higher from normal temperature. Too high a temperature can change the rheological property of the ink, reduce the viscosity of the ink, cause unstable ink transfer quantity, further cause quality problems such as different ink color shades of printed matters, dot gain and the like, and seriously influence the fineness and color reduction degree of the printed matters. In the plastic processing industry, rubber rollers are used for processes of calendaring, extrusion and the like of plastic products, and heat accumulation can also reduce the molding quality of the plastic products, so that the problems of surface flaws, size deviation and the like are caused. In the early stage, inorganic ceramic fillers such as aluminum oxide and magnesium oxide or carbon materials such as flake graphite and carbon fiber are often adopted, and are filled in matrixes such as silicon rubber, nitrile rubber and ethylene propylene diene monomer rubber. For example, when ethylene propylene diene monomer is filled with magnesia powder, a heat conducting net chain can be formed at high dosage, so that the heat conductivity is increased from 0.337W/(mK) to 0.776W/(mK), and a silicon rubber-based rubber roller is often filled with fillers such as alumina and aluminum nitride to balance the heat conductivity and the insulativity. In order to break through the performance bottleneck of single filler, multi-component filler composite technology has been developed in recent years. However, most of the traditional fillers are distributed in disorder, the heat conduction paths are disordered, directional heat conduction cannot be realized, and the interface thermal resistance among rubber layers and between rubber and a metal core is not effectively solved, so that the heat transfer efficiency is limited. Disclosure of Invention The invention aims to provide a composite heat-conducting rubber roller material and a preparation method thereof, which avoid local hot spots caused by traditional disordered fillers, reduce the temperature fluctuation of the surface layer of the rubber roller by combining the heat conduction design of a three-layer structure, and solve the product quality defect caused by uneven roller body temperature. The technical scheme is that the heat-conducting rubber roller material is of an annular structure matched with a rubber roller metal core, and comprises, by weight, 20-30 parts of nitrile rubber, 10-15 parts of silicon rubber, 3-5 parts of 5-10 mu m micron aluminum oxide, 2-4 parts of 10-20 mu m flake graphite, 0.5-1 part of zinc stearate and 0.5-0.8 part of vulcanizing agent sulfur, wherein the outer compact heat-conducting layer, the middle layer heat-conducting layer and the inner interface strengthening heat-conducting layer are arranged from outside to inside; The middle layer heat conduction layer comprises, by weight, 30-45 parts of silicon rubber and 5-8 parts of magnetic flake graphite; The inner layer interface reinforced heat conduction layer comprises liquid silicon rubber and an oriented heat conduction fiber membrane, and the fiber in the oriented heat conduction fiber membrane is radially coated on the outer side of the rubber roller metal in a high-orientation direction. The preparation method of the heat-conducting rubber roller material comprises the following steps: S1, adding nitrile rubber and silicon rubber into an internal mixer for banburying, sequentially adding micrometer alumina, flake graphite and zinc stearate, carrying out first mixing, finally adding a vulcanizing agent, carrying out second mixing and discharging, and adding the mixed material into a calender to prepare a rolled sheet with the thickness of 1mm, namely an outer compact heat conducting layer; s2, adding silicon rubber into an internal mixer for banburying, se