KR-102961202-B1 - Polyethylene Composition and Film Having Improved Light Transmittance and Combustion Suppression Properties

Abstract

The present invention relates to a polymer film, and more specifically, to a high-performance polyethylene film that maximizes mechanical strength using LLDPE as a sole base while simultaneously securing transparency and gas barrier properties by controlling the dispersibility of a high-concentration phosphorus-based flame retardant through a special biodegradable resin.

Inventors

• 김형석

Assignees

• (주)남일

Dates

Publication Date

20260512

Application Date

20260213

Claims (6)

1. 100 parts by weight of a base resin composed solely of Linear Low Density Polyethylene (LLDPE); 18 to 20 parts by weight of phosphorus-based flame retardant; 1.1 to 1.4 parts by weight of a biodegradable resin comprising a compostable polyester; and It comprises 1.1 to 1.4 parts by weight of a ternary antioxidant containing a phenolic antioxidant and a phosphorus-based antioxidant, and The above biodegradable resin is dispersed around the particles of the above phosphorus-based flame retardant to support compatibility within the base resin, thereby maintaining transparency, and The above-mentioned ternary antioxidant is characterized by being composed of IR-1076, IR-168, and PEP-8, which prevents thermal decomposition during processing. Polyethylene composition with improved light transmittance and combustion inhibition.
2. In paragraph 1, 0.5 to 0.8 parts by weight of slip agent (E-Amide); 0.3 to 0.5 parts by weight of neutralizing agent (Zn-St); 2.9 to 3.5 parts by weight of anti-blocking agent (AB agent), 0.4 to 0.6 parts by weight of processing aid and Characterized by further including 0.3 to 0.5 parts by weight of an antistatic agent, Polyethylene composition with improved light transmittance and combustion inhibition.
3. In paragraph 2, The above-mentioned phosphorus-based flame retardant comprises one or more of phosphate, phosphonate, and phosphinate, and The melt index (MI) of the above biodegradable resin is configured to be lower than the melt index of the above linear low-density polyethylene, characterized by encapsulating and dispersing a phosphorus-based flame retardant during processing. Polyethylene composition with improved light transmittance and combustion inhibition.
4. It is a multilayer film with a three-layer structure composed of layers stacked in the order of outer layer, inner layer, and outer layer, and The above inner layer is formed of the composition of claim 3, and The above outer layer is formed from a mixture of an oxygen barrier resin, ethylene vinyl alcohol (EVOH), and an adhesive resin (tie resin), and Characterized by maintaining the ratio of the thickness of the inner layer to the total thickness of the multilayer film at 60 to 80%, Polyethylene film with improved light transmittance and combustion inhibition.
5. In paragraph 4, The above composition further comprises 0.5 to 2.0 parts by weight of organically modified nanoclay (Organo-clay), and The above nano clay is exfoliated within the base resin to form a platelet barrier, thereby extending the penetration path of external oxygen and suppressing the leakage of internal flame-retardant gas. Polyethylene film with improved light transmittance and combustion inhibition.
6. In paragraph 5, The above biodegradable resin is, It includes modified starch obtained by reacting corn starch with a glycidyl ester of stearic acid, and The above modified starch is characterized by providing plasticity within the base resin without a separate starch plasticizer through ether-bonded long-chain alkyl groups, thereby preventing film breakage. Polyethylene film with improved light transmittance and combustion inhibition.

Description

Polyethylene Composition and Film Having Improved Light Transmittance and Combustion Suppression Properties The present invention relates to a polymer film, and more specifically, to a high-performance polyethylene film that maximizes mechanical strength using LLDPE as a sole base while simultaneously securing transparency and gas barrier properties by controlling the dispersibility of a high-concentration phosphorus-based flame retardant through a special biodegradable resin. In general, polyethylene (PE) resin is widely used in film form in various industrial fields, such as packaging, construction materials, and wire insulation, due to its excellent processability, flexibility, and chemical stability. However, polyethylene has a fatal disadvantage: as a flammable polymer composed solely of carbon and hydrogen in its molecular structure, it burns very rapidly in the event of a fire and causes flame spread through the drip phenomenon, where molten resin flows down. To suppress such flammability, halogen-based flame retardants containing halogen elements such as bromine (Br) or chlorine (Cl) have conventionally been added to polyethylene resins. Halogen-based flame retardants have long been the mainstream of the market due to their excellent vapor-phase flame retardant effect, which blocks chain reactions by capturing active radicals generated during combustion, and the economic advantage of being able to secure relatively excellent flame retardant performance with only a small amount of addition. However, from a technical perspective, halogen-based flame retardants have low compatibility with polyethylene resin, so when added in high amounts, the transparency of the film decreases rapidly and the mechanical strength weakens. In particular, as the film thickness decreases, a blooming phenomenon occurs where the added flame retardant particles seep out to the surface, causing appearance defects and making it difficult to guarantee long-term flame retardancy. A more serious problem is the harmful effects on the environment and the human body. Films containing halogenated flame retardants not only generate powerful carcinogens such as dioxins and furans upon combustion, but also release large amounts of highly corrosive hydrogen halide gases. These toxic gases are a direct cause of casualties in the event of a fire and cause serious environmental problems, such as causing secondary damage by corroding precision electronic devices or metal structures. As a result, regulations on the use of halogenated substances, such as RoHS (Restriction of Hazardous Substances) and REACH (Registration, Evaluation, Authorization and Restriction of Chemicals), have recently been tightening worldwide. Therefore, there is an urgent need to develop eco-friendly non-halogen flame retardant technology that maintains the excellent flame retardant efficiency of existing halogenated flame retardants while being harmless to the human body and the environment and not compromising the inherent physical properties of the film. Accordingly, the inventor of the present invention has completed the present invention after conducting long-term research and development through trial and error to solve the aforementioned problems. FIG. 1 is a drawing showing an example of the components of the polyethylene composition of the present invention. Figure 2 is an experimental result showing the change in transparency according to the biodegradable resin content of the present invention. In describing the present invention, detailed descriptions of related known functions are omitted if they are deemed obvious to a person skilled in the art and could unnecessarily obscure the essence of the invention. [Composition] FIG. 1 is a drawing showing an example of the components of the polyethylene composition of the present invention. The present invention relates to a polyethylene composition with improved light transmittance and combustion inhibition properties. The composition of the present invention may comprise a base resin composed solely of linear low-density polyethylene (LLDPE), a phosphorus-based flame retardant, an antioxidant, a slip agent, a neutralizing agent, an AB agent, a processing aid, an antistatic agent, and a biodegradable resin. In a preferred embodiment, the composition of the present invention may be mixed in the following weight parts. (1) 100 parts by weight of base resin composed solely of linear low-density polyethylene (LLDPE) (2) 18 to 20 parts by weight of phosphorus-based flame retardant (3) 1.1 to 1.4 parts by weight of a biodegradable resin containing compostable polyester (4) 1.1 to 1.4 parts by weight of a ternary antioxidant containing a phenolic antioxidant and a phosphorus-based antioxidant (5) 0.5 to 0.8 parts by weight of slip agent (E-Amide) (6) 0.3 to 0.5 parts by weight of neutralizing agent (Zn-St) (7) 2.9 to 3.5 parts by weight of anti-blocking agent (AB agent) (8) 0.4 to 0.6 parts by weight of processing aid (9