Search

CN-121450249-B - Surface protection film and application thereof

CN121450249BCN 121450249 BCN121450249 BCN 121450249BCN-121450249-B

Abstract

A surface protection film and a preparation method thereof belong to the technical field of protection films. The surface protection film comprises a surface layer, a core layer and a bonding layer which are sequentially arranged, wherein the surface layer comprises a first polypropylene matrix resin, an organic ultraviolet absorber and an inorganic ultraviolet shielding agent, the core layer comprises a second polypropylene matrix resin, polyaryletherketone nanofibers and platy mica powder with cerium oxide coated on the surface, and the bonding layer comprises a thermoplastic SEBS elastomer, a hydrogenated bonding resin, an organic zinc compound, an ultraviolet stabilizer and a plasticizer containing epoxy groups. The surface protection film has excellent ultraviolet aging resistance and high temperature resistance, the adhesive force can still be kept in a certain range under the ultraviolet irradiation and high temperature conditions, and the surface protection film can be easily unwound under the high temperature conditions without residual glue precipitation.

Inventors

  • DONG XUGANG
  • WU PENG

Assignees

  • 浙江洁美电子科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260105

Claims (8)

  1. 1. A surface protection film comprises a surface layer, a core layer and a bonding layer which are sequentially arranged; the method is characterized in that: the surface layer comprises a first polypropylene matrix resin, an organic ultraviolet absorbent and an inorganic ultraviolet shielding agent, wherein the organic ultraviolet absorbent consists of a first organic ultraviolet absorbent with the mass ratio of (4.5-6.75) in an absorption wave band of 290-350 nm and a second organic ultraviolet absorbent with the mass ratio of (2.5-3.75) in an absorption wave band of 300-400 nm, the organic ultraviolet absorbent accounts for 7-10.5% of the surface layer, and the mass ratio of the organic ultraviolet absorbent to the inorganic ultraviolet shielding agent is 1.55-3.5; The core layer comprises second polypropylene base resin, polyaryletherketone nanofibers and platy mica powder with cerium oxide coated on the surface, wherein the nanofibers account for 5-12% of the core layer in mass percent, and the platy mica powder accounts for 5-10% of the core layer in mass percent; The bonding layer comprises a thermoplastic SEBS elastomer, hydrogenated bonding resin, an organic zinc compound, an ultraviolet light stabilizer and a plasticizer containing epoxy groups, wherein the ultraviolet light stabilizer accounts for 5-10% of the bonding layer by mass; The inorganic ultraviolet shielding agent is silane coupling agent modified nano zinc oxide; The organic zinc compound is selected from one of a compound of zinc stearate and beta-diketone compound and a compound of hydrotalcite and zinc salt.
  2. 2. The surface protective film according to claim 1, wherein: the first polypropylene matrix resin is random block polypropylene, and the second polypropylene matrix resin is isotactic homopolypropylene.
  3. 3. The surface protective film according to claim 1 or 2, characterized in that: the surface layer also includes silica open master batches.
  4. 4. The surface protective film according to claim 1 or 2, characterized in that: the core layer also includes a maleic anhydride grafted polypropylene.
  5. 5. The surface protective film according to claim 1, wherein: The plasticizer is selected from one of epoxidized soybean oil, epoxidized linseed oil, epoxidized castor oil, epoxidized palm oil and 4, 5-epoxy tetrahydrophthalic acid di (2-ethylhexyl) ester.
  6. 6. The surface protective film according to claim 1, wherein: The ultraviolet light stabilizer is one of bis (2, 6-tetramethyl-4-piperidine) sebacate and bis (1-octyloxy-2, 6-tetramethyl-4-piperidine) sebacate.
  7. 7. The surface protective film according to claim 1, wherein: After QUV aging for 500h, the tensile strength retention rate is more than 80%, the yellowing index is less than 3, and the peeling force change rate is less than 12%; 120 ℃, a heat shrinkage of <1.0% for 30 min; Attaching the surface protection film to a glass plate, and stripping the adhesive residue-free after placing the glass plate in a 120 ℃ oven for 1 hour; After the surface protection film is placed in a constant temperature and humidity box with the temperature of 60 ℃ and the RH of 85 percent for 30 days, the appearance is unchanged, and the unreeling force is less than or equal to 1.0N/25mm.
  8. 8. The use of a surface protective film according to any one of claims 1 to 7, characterized in that it is used for the surface protection of materials having the requirements of resistance to ultraviolet light and high temperature.

Description

Surface protection film and application thereof Technical Field The invention belongs to the technical field of protective films, and particularly relates to a surface protection film which is resistant to ultraviolet rays and high temperature, can keep certain adhesive force, is high Wen Xiarong, is easy to unwind and is free from residual glue precipitation, and can be applied to surface protection of materials with ultraviolet rays and high temperature resistant requirements. Background With the rapid development of fields such as precision manufacturing, electronic display and high-end building materials, the surface temporary protection requirements in the processing, transportation and storage processes of the protective film are increasing, and the protective film is used as a key protection material and effectively prevents the surface of a product from being damaged by scratch, pollution, abrasion or chemical corrosion and the like through a physical isolation mechanism. The surface protection film generally comprises a surface layer, a core layer and a bonding layer, has moderate initial adhesive force, ensures bonding firmness and simultaneously gives attention to the convenience of unreeling, can still keep bonding stability after long-term use, and avoids the phenomena of edge warping, bubble formation and residual glue residue. For surface protection of materials with ultraviolet and high temperature resistant requirements, such as vehicle-mounted display, photovoltaic modules (such as solar panels), high-end household appliances, non-imaging optical elements (such as decoration pieces, light diffusion plates, indication boards and the like), the surface protection film also needs to have antistatic property and excellent weather resistance, such as ultraviolet aging resistance, high temperature resistance and the like. At present, the traditional surface protection film often has the problem of poor weather resistance, such as the occurrence of molecular chain fracture under the irradiation of outdoor ultraviolet rays for a long time, so that the film material becomes yellow, crisp and chalky, and loses the protection function, or the occurrence of the situation that the adhesive layer of the protection film is softened in summer insolation, hot processing (such as metal spray painting and baking) or high-temperature environment, cohesive failure occurs, so that residual adhesive or the adhesive layer is permanently adhered to the surface of a protected object, and the peeling cannot occur. In the prior art, as disclosed in China patent publication No. CN118813155A, the self-adhesive protective film comprises a temperature-resistant self-adhesive layer, a Gao Wenxin-resistant layer and a functional back layer which are sequentially stacked from bottom to top, wherein the Gao Wenxin-resistant layer is prepared from, by weight, 100 parts of polypropylene, 10-20 parts of polyolefin elastomer (POE) and 3-10 parts of modified silicon dioxide, the temperature-resistant self-adhesive layer is prepared from, by weight, 40-60 parts of low-density polyethylene, 20-30 parts of metallocene polyethylene, 5-40 parts of SEBS and 1-3 parts of an anti-aging agent, and the functional back layer is prepared from, by weight, 100 parts of polypropylene, 2-20 parts of polyethylene and 1-10 parts of a fluorine-containing release agent. Although the above proposal mentions improvement of high temperature resistance and ultraviolet aging resistance, the POE component of the core layer has poor heat resistance, and lacks protection against ultraviolet aging resistance in the functional back layer, and the whole high temperature resistance and ultraviolet aging resistance of the protective film may be affected by only the modified silica of the core layer. Disclosure of Invention The invention aims to provide a surface protective film and application thereof, and further improves the composition of the protective film and the formula of each layer so as to solve the technical problems. The specific technical scheme is as follows: A surface protection film comprises a surface layer, a core layer and a bonding layer which are sequentially arranged; the surface layer comprises a first polypropylene matrix resin, an organic ultraviolet absorbent and an inorganic ultraviolet shielding agent, wherein the organic ultraviolet absorbent consists of a first organic ultraviolet absorbent with the mass ratio of (4.5-6.75) in an absorption wave band of 290-350 nm and a second organic ultraviolet absorbent with the mass ratio of (2.5-3.75) in an absorption wave band of 300-400 nm, the organic ultraviolet absorbent accounts for 7-10.5% of the surface layer, and the mass ratio of the organic ultraviolet absorbent to the inorganic ultraviolet shielding agent is 1.55-3.5; The core layer comprises second polypropylene base resin, polyaryletherketone nanofibers and platy mica powder with cerium oxide coated on the surface, wherein the nan