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CN-122011697-A - Halogen-free polyester film and preparation method thereof

CN122011697ACN 122011697 ACN122011697 ACN 122011697ACN-122011697-A

Abstract

The application relates to the technical field of plastic films, and particularly discloses a halogen-free polyester film and a preparation method thereof. The application provides a halogen-free polyester film which comprises, by weight, 60-75 parts of a base material, 25-40 parts of a composite flame retardant, 0.5-1 part of an interface modifier and 0.5-1 part of other auxiliary agents, wherein the composite flame retardant comprises (0.8-1.5) of aluminum diethylphosphinate, (1-2) of melamine cyanurate and vanillin-derived phosphorus-nitrogen flame retardant, and further comprises (1-1.3) of aluminum diethylphosphinate, melamine cyanurate and vanillin-derived phosphorus-nitrogen flame retardant, and the preparation method of the halogen-free polyester film is provided. The halogen-free polyester film provided by the application has the advantages of good environmental protection, good flame retardance and excellent mechanical property, and can meet the requirements of practical application on the comprehensive performance of materials.

Inventors

  • WU JUN
  • SUN WENXUN
  • HU HAILIN
  • Hu Shoudao
  • SUN ZEREN
  • LUO JIANFANG
  • FANG MINGGANG
  • YU JIANGANG
  • ZENG GANG

Assignees

  • 绍兴翔宇绿色包装有限公司

Dates

Publication Date
20260512
Application Date
20260304

Claims (9)

  1. 1. The halogen-free polyester film is characterized by comprising, by weight, 60-75 parts of a base material, 25-40 parts of a composite flame retardant, 0.5-1 part of an interface modifier and 0.5-1 part of other auxiliary agents; the composite flame retardant is an aluminum diethyl phosphinate, melamine cyanurate and vanillin derived phosphorus nitrogen flame retardant with the weight ratio of (0.8-1.5) to (1-2).
  2. 2. The halogen-free polyester film according to claim 1, wherein the weight ratio of the diethyl phosphinate aluminum, the melamine cyanurate and the vanillin derived phosphazene flame retardant is 3 (1-1.3): 1.5-2.
  3. 3. The halogen-free polyester film of claim 1 wherein the weight ratio of aluminum diethylphosphinate, melamine cyanurate, and vanillin derived phosphazene flame retardant is 3:1:1.5.
  4. 4. The halogen-free polyester film according to claim 1, wherein the matrix material is polyethylene terephthalate, and the other auxiliary agent is selected from the group consisting of antioxidants and lubricants.
  5. 5. The halogen-free polyester film of claim 1 wherein the interface modifier is selected from the group consisting of gamma-allopropyl triethoxysilane, 2- (3, 4-epoxycyclohexane) ethyl triethoxysilane, diethylphosphoryl ethyl triethoxysilane, and 2- (diphenylphosphino) ethyl triethoxysilane.
  6. 6. The halogen-free polyester film according to claim 1, wherein the interfacial modifier is 2- (3, 4-epoxycyclohexane) ethyltriethoxysilane and 2- (diphenylphosphino) ethyltriethoxysilane in a weight ratio of (1.5-3).
  7. 7. The halogen-free polyester film according to any one of claims 1 to 6, wherein the thickness of the halogen-free polyester film is 20 to 30 μm, the tensile strength is not less than 160MPa, the limiting oxygen index LOI is not less than 25%, and the flame retardant rating is VTM-0.
  8. 8. The method for preparing the halogen-free polyester film according to any one of claims 1 to 6, which is characterized by comprising the steps of adding a composite flame retardant, an interface modifier and other auxiliary agents into a matrix material, stirring and premixing, then forming a blank film through melt blending and extrusion, and finally obtaining the halogen-free polyester film through biaxial stretching film forming and heat setting; the longitudinal stretching temperature of the biaxially stretched film is 95+/-5 ℃, the transverse stretching temperature is 110+/-5 ℃, the longitudinal/transverse stretching ratio (3-4) is 1, and the heat setting temperature is 180-220 ℃.
  9. 9. The method for preparing the halogen-free polyester film according to claim 8, wherein the melt blending and the extrusion are performed by a twin screw extruder, and the temperatures of the areas are 255+/-5 ℃, 265+/-5 ℃, 270+/-5 ℃ and 275+/-5 ℃ respectively.

Description

Halogen-free polyester film and preparation method thereof Technical Field The application relates to the technical field of plastic films, in particular to a halogen-free polyester film and a preparation method thereof. Background Polyester films are widely used in various fields such as electronics, packaging, and construction due to their excellent mechanical properties, heat resistance, and electrical insulation. However, the conventional polyester film has inflammable characteristics, and it is necessary to modify it by adding a flame retardant in order to meet the safety requirements. At present, halogen-containing flame retardants (such as brominated compounds) are commonly adopted in the industry to carry out flame retardant modification on polyester films, and the flame retardants release toxic and harmful gases such as dioxin in the combustion process although the flame retardant efficiency is high, so that the human health and the ecological environment are seriously endangered, the requirements of environmental protection regulations such as European Union RoHS are not met, and the application range is strictly limited. In recent years, the halogen-free flame retardant technology becomes a research hot spot for flame retardant modification of the polyester film, but the existing halogen-free flame retardant system still has the problem of lower flame retardant efficiency, a large amount of flame retardant is needed to achieve an ideal flame retardant effect, however, the compatibility of the inorganic flame retardant and a polyester matrix is poor, the processing stability of the film is affected, the mechanical property of the film is obviously reduced, and the requirement of practical application on the comprehensive performance of the material is difficult to meet. Therefore, the development of the halogen-free polyester film with high flame retardant efficiency and excellent mechanical property has important significance. Disclosure of Invention The application provides a halogen-free polyester film and a preparation method thereof, aiming at solving the problems that the existing polyester film is poor in environmental protection, and incapable of combining flame retardance with mechanical properties. The application provides a halogen-free polyester film, which adopts the following technical scheme: The halogen-free polyester film comprises the following raw materials, by weight, 60-75 parts of a matrix material, 25-40 parts of a composite flame retardant, 0.5-1 part of an interface modifier and 0.5-1 part of other auxiliary agents; the composite flame retardant is an aluminum diethyl phosphinate, melamine cyanurate and vanillin derived phosphorus nitrogen flame retardant with the weight ratio of (0.8-1.5) to (1-2). The application provides a halogen-free polyester film, which realizes synchronous improvement of flame retardance and mechanical property of the polyester film by selecting the type and the proportion of a flame retardant, and effectively solves the problems that the flame retardance and the mechanical property of the traditional polyester film are difficult to be compatible and the halogen-containing flame retardant material burns to pollute the environment. The flame retardant system is a halogen-free formula, can radically avoid the problem that the traditional halogen-containing flame retardant burns to produce highly toxic and corrosive gases such as hydrogen halide, and the like, is matched with an environment-friendly molecular structure of the vanillin-derived flame retardant, greatly reduces the release amount of toxic and harmful components in combustion flue gas, and remarkably improves the environmental protection of the combustion gas. The interfacial compatibility of the composite flame retardant and the polyester matrix can be improved by adding the interfacial modifier, the problem that the high-filling flame retardant is easy to cause the deterioration of the mechanical properties of the film is solved, and the mechanical properties such as the tensile strength of the film are kept at an ideal level, so that good processing formability and durability in use are realized. In conclusion, the film provided by the application realizes the balance of flame retardance, mechanics and environmental protection performance, can be widely applied to the fields with high requirements on material safety and environmental protection, such as electronic appliances, rail transit and the like, and has good application prospects. Optionally, the weight ratio of the diethyl aluminum phosphinate, the melamine cyanurate and the vanillin derivative phosphorus nitrogen flame retardant is 3 (1-1.3) (1.5-2). Optionally, the weight ratio of the aluminum diethylphosphinate, melamine cyanurate and vanillin-derived phosphazene flame retardant is 3:1:1.5. Optionally, the matrix material is polyethylene terephthalate, and the other auxiliary agents are selected from antioxidants and lubrica