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CN-122011463-A - Release film for ceramic capacitor and preparation method thereof

CN122011463ACN 122011463 ACN122011463 ACN 122011463ACN-122011463-A

Abstract

The invention relates to the technical field of brackets, in particular to a release film for a ceramic capacitor and a preparation method thereof. The release film comprises a substrate layer and a composite release agent coating, wherein the substrate layer comprises polytetrafluoroethylene glass varnished cloth, the polytetrafluoroethylene glass varnished cloth comprises 100-120 parts of glass fiber cloth and 10-12 parts of polytetrafluoroethylene dispersion liquid, the composite release agent coating comprises paraffin and an oily release agent, the mass ratio of the paraffin to the oily release agent is 1 (1.5-2.5), the mass part of the paraffin is 80-85, and the oily release agent is an organosilicon release agent. The release film prepared by the invention has uniform thickness, the occurrence rate of the mucous membrane is only 10% -15%, the release time is shortened to 5-8s, the damage to the coating layer of the outer electrode of the ceramic capacitor is avoided, the production efficiency and quality of the ceramic capacitor are effectively improved, and the production cost is reduced.

Inventors

  • LI TONGPING
  • LI BINGYANG
  • LI SONGTAO
  • LI HONGYING
  • Xi Houping

Assignees

  • 江苏平宇新材料有限公司

Dates

Publication Date
20260512
Application Date
20251219

Claims (10)

  1. 1. The release film for the ceramic capacitor is characterized by comprising a substrate layer and a composite release agent coating; the substrate layer consists of polytetrafluoroethylene glass varnished cloth, wherein the polytetrafluoroethylene glass varnished cloth comprises 100-120 parts of glass fiber cloth and 10-12 parts of polytetrafluoroethylene dispersion liquid; the composite release agent coating consists of paraffin wax and an oily release agent, wherein the mass ratio of the paraffin wax to the oily release agent is 1 (1.5-2.5), and the mass part of the paraffin wax is 80-85 parts; The oily release agent is an organosilicon release agent, and the organosilicon release agent comprises, by mass, 75-85 parts of polydimethylsiloxane, 15-25 parts of a silane coupling agent, 15-22 parts of dimethylbenzene, 0.25-0.45 part of dibutyltin dilaurate, 0.2-0.25 part of an antioxidant, 0.12-0.36 part of an ultraviolet absorber, 0.02-0.05 part of a thickener, 0.12-0.22 part of fatty acid salt and 0.02-0.04 part of borate.
  2. 2. The release film for ceramic capacitors according to claim 1, wherein the glass fiber cloth gram weight is 120-180g/m 2 ; The long-term use temperature of the polytetrafluoroethylene glass varnished cloth is 280-300 ℃, the surface energy is 30-40mN/m, and the shrinkage rate is 0.5% -0.8%.
  3. 3. The release film for ceramic capacitors according to claim 1, wherein the paraffin wax is refined paraffin wax with a melting point of 55-65 ℃, and the content of linear paraffin is more than 92%; The silicone release agent has a viscosity of 80-150mPa seed s at 25 ℃.
  4. 4. The release film for ceramic capacitors according to claim 1, wherein the thickness of the release film is 25 to 40 μm, wherein the thickness of the base material layer is 20 to 30 μm, and the thickness of the composite release agent coating is 6 to 8 μm.
  5. 5. The release film for ceramic capacitors according to claim 1, wherein the base material layer is composed of polytetrafluoroethylene glass paint cloth, the polytetrafluoroethylene glass paint cloth comprises 110 parts of glass fiber cloth and 11 parts of polytetrafluoroethylene dispersion; the composite release agent coating consists of paraffin wax and an oily release agent, wherein the mass ratio of the paraffin wax to the oily release agent is 1:1.55, and the mass part of the paraffin wax is 83 parts; The oily release agent is an organosilicon release agent, and the organosilicon release agent comprises the following raw materials, by mass, 80 parts of polydimethylsiloxane, 20 parts of a silane coupling agent, 18 parts of dimethylbenzene, 0.35 part of dibutyltin dilaurate, 0.22 part of an antioxidant, 0.24 part of an ultraviolet absorbent, 0.02 part of a thickener, 0.18 part of fatty acid salt and 0.03 part of borate.
  6. 6. The release film for ceramic capacitors according to claim 5, wherein the silane coupling agent is any one of gamma-aminopropyl triethoxysilane and gamma- (2, 3-glycidoxy) propyl trimethoxysilane; the antioxidant is a hindered phenol antioxidant; the ultraviolet absorbent is benzotriazole ultraviolet absorbent; the thickener is fumed silica; The fatty acid salt is any one of sodium oleate and sodium stearate; The borate is any one of borax and boric acid.
  7. 7. The method for producing a release film for ceramic capacitors according to any one of claims 1 to 6, comprising the steps of: Preparing a substrate layer, namely immersing glass fiber cloth in a polytetrafluoroethylene dispersion liquid in parts by mass, and drying and sintering to obtain the glass fiber cloth; Step two, preparing a composite release agent, namely weighing paraffin and an oily release agent according to the mass ratio, heating to 60-80 ℃ and uniformly stirring to form the composite release agent; Step three, a coating procedure, namely uniformly coating the composite release agent on the surface of the substrate layer at a coating speed of 15-25m/min, a coating weight of 8-12g/m 2 and a coating temperature of 35-45 ℃ in an environment with the cleanliness of more than 1000 level; And step four, drying and curing, namely drying the coated release film with hot air at the temperature of 90-110 ℃ for 4-6min under normal pressure, and curing with ultraviolet rays with the wavelength of 300-400nm and the intensity of 900-1100mJ/cm 2 in an anaerobic environment.
  8. 8. The method for preparing a release film for a ceramic capacitor according to claim 7, wherein the glass fiber cloth is pretreated before being immersed in polytetrafluoroethylene dispersion, is placed in sodium hydroxide solution with a concentration of 3-5%, is immersed for 20-30 minutes at 50-60 ℃, is then rinsed to be neutral with deionized water and is dried; The glass fiber cloth is soaked in the polytetrafluoroethylene dispersion for 15-30min.
  9. 9. The method of claim 7, wherein in the step one of drying and sintering, the drying temperature is 100-150 ℃, the drying time is 10-20min, the sintering temperature is 300-350 ℃, and the sintering time is 5-10min.
  10. 10. The method for preparing a release film for a ceramic capacitor according to claim 7, wherein the stirring speed of the composite release agent in the second step is 200-300r/min and the stirring time is 20-30min.

Description

Release film for ceramic capacitor and preparation method thereof Technical Field The invention relates to the technical field of release films, in particular to a release film for a ceramic capacitor and a preparation method thereof. Background Ceramic capacitors are widely applied to various fields such as smart phones, computers, automotive electronics, aerospace and the like by virtue of the outstanding advantages of high capacitance, low loss, small volume and the like. The release film is used as an indispensable key auxiliary material in the ceramic capacitor production process, and the quality of the performance directly influences the quality, production efficiency and manufacturing cost of the ceramic capacitor. However, the conventional release film for ceramic capacitors has a plurality of defects in terms of material composition and preparation process, and is difficult to meet the current increasingly severe production and use requirements. The release agent used by the traditional release film has single component, and is difficult to provide stable and reliable anti-adhesive performance for the release film under complex production conditions. Under the production process conditions of high temperature and high pressure, the adhesion between the release film and the ceramic capacitor composite material is obviously enhanced, and the mucous membrane phenomenon frequently occurs. The mucosa can cause that the release film is difficult to separate from the ceramic capacitor, and the forced stripping can damage an external electrode coating layer containing glass components in the composite layer of the ceramic capacitor, so that the electrical performance and the reliability of the ceramic capacitor are reduced. In the production process of multilayer ceramic capacitors (MLCCs), the product reject ratio due to the mucosa problem is as high as 15% -20%. In view of the above, the present application provides a release film for ceramic capacitors having stable and reliable anti-adhesion properties and release effect, and a method for preparing the same. Disclosure of Invention The invention aims at solving the problems in the background technology and provides a release film with stable and reliable anti-adhesion performance and release effect for a ceramic capacitor and a preparation method thereof. The technical scheme of the invention is that the release film for the ceramic capacitor consists of a substrate layer and a composite release agent coating; the substrate layer consists of polytetrafluoroethylene glass varnished cloth, wherein the polytetrafluoroethylene glass varnished cloth comprises 100-120 parts of glass fiber cloth and 10-12 parts of polytetrafluoroethylene dispersion liquid; the composite release agent coating consists of paraffin wax and an oily release agent, wherein the mass ratio of the paraffin wax to the oily release agent is 1 (1.5-2.5), and the mass part of the paraffin wax is 80-85 parts; The oily release agent is an organosilicon release agent, and the organosilicon release agent comprises, by mass, 75-85 parts of polydimethylsiloxane, 15-25 parts of a silane coupling agent, 15-22 parts of dimethylbenzene, 0.25-0.45 part of dibutyltin dilaurate, 0.2-0.25 part of an antioxidant, 0.12-0.36 part of an ultraviolet absorber, 0.02-0.05 part of a thickener, 0.12-0.22 part of fatty acid salt and 0.02-0.04 part of borate. Optionally, the gram weight of the glass fiber cloth is 120-180g/m 2; The long-term use temperature of the polytetrafluoroethylene glass varnished cloth is 280-300 ℃, the surface energy is 30-40mN/m, and the shrinkage rate is 0.5% -0.8%. Optionally, the paraffin is refined paraffin with a melting point of 55-65 ℃, and the content of linear paraffin is more than 92%; The silicone release agent has a viscosity of 80-150mPa seed s at 25 ℃. Optionally, the thickness of the release film is 25-40 μm, wherein the thickness of the substrate layer is 20-30 μm, and the thickness of the composite release agent coating is 6-8 μm. Optionally, the substrate layer is composed of polytetrafluoroethylene glass varnished cloth, wherein the polytetrafluoroethylene glass varnished cloth comprises 110 parts of glass fiber cloth and 11 parts of polytetrafluoroethylene dispersion liquid; the composite release agent coating consists of paraffin wax and an oily release agent, wherein the mass ratio of the paraffin wax to the oily release agent is 1:1.55, and the mass part of the paraffin wax is 83 parts; The oily release agent is an organosilicon release agent, and the organosilicon release agent comprises the following raw materials, by mass, 80 parts of polydimethylsiloxane, 20 parts of a silane coupling agent, 18 parts of dimethylbenzene, 0.35 part of dibutyltin dilaurate, 0.22 part of an antioxidant, 0.24 part of an ultraviolet absorbent, 0.02 part of a thickener, 0.18 part of fatty acid salt and 0.03 part of borate. Optionally, the silane coupling agent is any one of gamma-amino