KR100773735B1 - Dust proof film and its preparation method - Google Patents

Abstract

A film for preventing the fall of ash and dust, thereby protecting the coating of vehicles, and a method for preparing the film are provided to improve air ventilation and smoothness and to prevent the discoloration due to sunlight or the deterioration of strength. A film for preventing the fall of ash and dust comprises 100 parts by weight of a polyester resin which comprises 5-28 wt% of low density polyethylene resin, 70-93 wt% of linear low density polyethylene resin and 2-10 wt% of high density polyethylene resin; 50-200 parts by weight of an inorganic filler; and 1-10 parts by weight of at least one elastic resin selected from ethylene-vinyl acetate resin, ethylene-ethyl acrylate copolymer, thermoplastic elastomer, and ethylene-propylene-diene monomer rubber.

Description

Fallout prevention film and its manufacturing method {Dust Proof Film and Its Preparation Method}

The present invention is excellent in breathability and basis weight, and there is no discoloration or deterioration of strength due to sunlight, and relates to a polyethylene film for automobile film protection without static electricity.

Automobiles are covered with plastic film to protect the surface of the paint surface from scratch and dust. At present, most of them are made of fabrics such as “Wrap guard film” and “TYVEK”. I'm doing it.

Wrap guard film is a self-adhesive film made of PP and PE film, which is used to adhere completely to the surface of a vehicle when it is shipped. When the wrap guard film is attached to be wrinkled or bubbled when attached, water droplets are generated in the coating of the vehicle due to shrinkage or moisture in the film that is not completely adhered. Therefore, in order to completely attach the wrap guard film, a severe overload of the musculoskeletal of the operator occurs. In addition, the components exhibiting self-adhesion of the film have a problem in that, if they are attached to the vehicle for more than three months, oxidation proceeds and traces are generated on the vehicle coating.

Tyvek is a film made by stretching high-density polyethylene manufactured by DuPont, and woven diagonally. It is known to have a lot of pores, such as evaporation of moisture easily. For Tyvek, a spunbonded fibrous sheet made of multiple flexifilment strands of oriented polyethylene film fibrils is described in US Pat. No. 3,169,899, which combines the strength, tear resistance and permeability properties of the sheet well combined. Has proven to be useful in a variety of applications.

However, Tyvek, which is currently on the market, is expensive, has a lot of dust adsorbed through the body through the hole, the fabric itself is stiff and difficult to work when covering the vehicle, and there is also a disadvantage that the scratch is generated.

The present invention is excellent in breathability and basis weight, to provide a polyethylene film for protecting the automotive film without static discoloration or decrease in strength due to sunlight.

In another aspect, the present invention to provide a new fall prevention film having excellent mechanical strength and soft and excellent breathability having elastic properties.

In another aspect, the present invention is to provide a film for the purpose of preventing contaminants on the painted surface of the vehicle during the transportation of the new car or scratching the painted surface.

As a result of the efforts to solve the above disadvantages, the present applicant has (A) (a) 5-30% by weight of low density polyethylene resin (b) 70-93% by weight of linear low density polyethylene resin and (c) 2-10% by weight of high density polyethylene resin With respect to 100 parts by weight of the polyethylene resin consisting of, (B) was found that the breathable elastic fall prevention film produced by the polyethylene composition containing 50 to 200 parts by weight of the inorganic filler was completed the present invention.

In addition, the present invention (A) (a) 5-30% by weight of low-density polyethylene resin (b) 60 to 80% by weight of non-metallocene-based linear low-density polyethylene resin and 40 to 20% by weight of metallocene-based linear low-density polyethylene Breathable elastic fallout prepared by polyethylene composition comprising (B) 50 to 200 parts by weight of inorganic filler, based on 100 parts by weight of polyethylene resin consisting of 70 to 93% by weight of polyethylene and 2 to 10% by weight of high density polyethylene resin. It was found that the prevention film can be produced to complete the present invention.

In addition, the present invention is selected from EVA (ethylene-vinylacetate) resin, EEA (ethylene-ethyl acrylate copolymer), TPE (thermoplastic elastomer), EPDM (ethylene propylene diene monomer) rubber based on 100 parts by weight of the polyethylene resin By adding an additional 1 to 10 parts by weight of any one of the elastic resin by appropriately added elasticity and adhesiveness to wrap the vehicle body with a film to prevent peeling by lift and to produce a breathable film that gives a more soft feeling the present invention To complete.

In addition, the composition of the present invention may add at least one additive component selected from conventional stabilizers, antioxidants, ultraviolet absorbers and humectants, lubricants, and the amount of the amount used may be It should not exceed 7% by weight.

The low-density polyethylene is used as a component of the present invention 3 to 30% by weight based on the total polyethylene resin, if less than 3% by weight is not preferable because a lot of neck-in occurs during film processing, 30% or more by weight of the produced film The mechanical strength of is too low to be preferable. In addition, low density polyethylene has a melt flow rate of 2g / 10min. The use of from 7 g / 10 min is preferable in the smoothness of the film produced by stabilizing the mechanical properties or the processability of the film.

The linear low density polyethylene of the present invention is used in the range of 70 to 93% by weight based on the total polyethylene resin and the melt flow rate is 1.0g / 10min. If the density is from 0.916g / cc to 0.923g / cc, the film can be produced without mechanical or other deterioration of physical properties. The range of 70 to 93% by weight of the linear low density polyethylene resin is the most appropriate range that can balance the characteristics required by the fall prevention film such as the neck-in, the mechanical properties of the film, and the elasticity of the film. In the present invention, when the linear low density polyethylene is used alone or in a mixture of the linear low density polyethylene prepared by a metallocene catalyst, it is possible to provide an excellent film having excellent mechanical properties and rarely causing tearing. In the case of using the metallocene-based linear low density polyethylene, it is preferable to use 20-40% by weight of the metallocene-based resin based on the total linear low-density polyethylene in that it can exhibit the appropriate elasticity of the fall prevention film.

The high density polyethylene of the present invention is preferably used in an amount of 2 to 10% by weight based on the total polyethylene resin in terms of improving mechanical properties of the linear low density polyethylene. In addition, the high density polyethylene resin of the present invention has a melt flow of 4.0g / 10min. ~ 7.0g / 10min and the density of 0.940g / cc ~ 0.960g / cc is not limited when using a thing.

The inorganic filler of the present invention uses calcium carbonate, magnesium carbonate, magnesium sulfate, titanium dioxide, and the like. In the practice of the present invention, an average particle size of 1.5 to 4.0 m, more preferably 2.0 to 3.0 m is used. It obtains excellent physical properties without damaging the physical properties of the film. If the average particle diameter is less than 1.5 μm, good air permeability cannot be obtained. If the average particle diameter is larger than 4.0 μm, the stretchability becomes poor, and thus, the air permeability is not reached to the level aimed at the air permeability. Elongation is poor.

In addition, the present invention is preferably used by adding an antistatic agent as needed, if the person skilled in the art is commonly used is not limited, the antistatic agent and the solvent (isopropyl alcohol, etc.) 1: 100 ~ on one side of the produced film The antistatic agent solution mixed at a weight ratio of 300 may be used by coating by spray or printing roll method. However, the present invention is not limited thereto, and it is obvious that the present invention can be modified and used as necessary.

Hereinafter, the present invention will be described in detail a method for producing a porous film. All of the compositions of the present invention are mixed in a mixer such as Henschel mixer, melt kneaded in an extruder, pelletized, and melted and inflation using a blown film extruder or a T-die film extruder to form a film. After the film is prepared as described above, the film is stretched by a rotation ratio of a continuous roller, or stretched at a magnification of about 1.1 to 3 in at least one axis or biaxial direction according to a conventional method such as blown by expansion of air. After the stretching is completed, it can be annealed to stabilize the air permeable pores.

The breathability is determined by the particle size and particle size distribution of the inorganic filler and the amount or draw ratio of the inorganic filler.If the draw ratio is less than 1.1, the target porosity cannot be obtained, while the draw ratio is 3 or more. This is not good because it may appear to be destroyed.

Porous films made by the process of the present invention are characterized by high porosity, excellent flexibility and low strength reduction. Therefore, the fallout prevention film of the present invention shows very excellent characteristics as a fallout prevention use because a sufficient porosity, soft touch and deterioration of physical properties are minimized.

The film produced by the above manufacturing process of the present invention is preferably produced in a thickness of 50 ~ 150GSM (g / ㎡), preferably 80 ~ 100GSM thickness. The fallout prevention film of the present invention exhibits excellent physical properties of moisture permeability of 1500 g / m 2 .day or more.

The present invention is described in more detail by examples, but these examples are provided for purposes of illustration and are not to be considered as limiting the scope of the invention.

In the present invention, the strength and the elongation rate are tested using a universal material tester manufactured by Instron Co., Ltd., at 25 mm in width and 100 mm in length at a stretch rate of 20 mm / min. The strength and elongation at break are measured in the machine direction (MD) and in the transverse direction (CD). Moisture permeability was measured according to ASTM E 96-63. Flexibility was assessed by texture, indicating A = very flexible and smooth, B = flexible and smooth, C = hard and rough, and the scratch evaluation of the vehicle surface was visual. Occurrence was observed. Surface resistance was measured according to the method of ASTM D-275.

Example 1-2

The base resin and the additives were mixed according to the prescription shown in Table 1, followed by mixing with a super mixer. As the inorganic filler, calcium carbonate having an average particle diameter of 1.3 μm was used. After mixing in a super mixer, melt-kneading using a twin-extruder, pellets are prepared and melted at 230-250 ° C. in a T-die extruder to form a film, and the film is heated with a preheat roller heated to 60 ° C. The film was stretched between rollers to obtain a film having a basis weight of 90 GSM. The characteristics are shown in Table 2.

Comparative Example 1-2

It was carried out in the same manner as in Comparative Example 1 except that the formulation as shown in Table 1. The results are shown in Table 2.

Example 3-4

Except for coating an antistatic agent solution on one side of the film prepared in Example 1 using a printing roll was carried out in the same manner as in Example 1-2. The antistatic agent was mixed with SANEM CHEMICAL's CHEMSTAT-3500 and isopropyl alcohol in a weight ratio of 1: 200, coated on a film, and dried at 120 ° C. in a dryer.

Example 5

The experiment was performed by replacing EVA with metallocene LLDPE in Example 3-4.

 Table 1. Composition and Physical Properties of the Film (Unit: wt%)

LDPE: Hanwha Chemical (Product Name: LDPE 950, 7.5MI, 0.917 g / cm 3)

LLDPE: Hanwha Petrochemical (Product Name: LLDPE HS 1700, 3.2MI, 0.923 g / cm3)

Metallocene LLDPE: Daelim Chemical (brand name: XP8200, 3.0MI, 0.935 g / cm 3)

EVA: Hanwha Petrochemical (trade name: EVA 1315, 1.5MI, 0.939 g / cm 3, vinyl acetate content 15%)

HDPE: LG Petrochemical (brand name: HDPE ME 5000, 5.0MI, 0.960 g / cm 3)

CaCO ₃ # 1: OM-5, OMYA, 3.0㎛

CaCO ₃ # 2: OM-5, DOWA, 1.2㎛

UV stabilizer: SYASORB (brand name: UV3529)

additive; TiO ₂ / antioxidant (SYASORB 2777) / lubricant (Zn-st) / dehumidifier (EM-12) = 50/15/15/20 weight ratio mixed

Antistatic agent: SANYO CHEMICAL, CHEMSTAT-3500 (sodium polyoxyethylene alkyl ether phosphate)

Table 2. Physical property data of Examples and Comparative Examples

As shown in the above table, it can be seen that the surface resistance is reduced when the antistatic agent is treated, and in the case of Example 5 using EVA instead of the metallocene LLDPE, high moisture permeability and flexibility It turned out that this excellent effect is found.

In the comparative example using only LDPE and LLDPE, it was found that the tensile strength and the elongation were lower than those of the example, and were also inferior in the moisture permeability and flexibility.

The present invention is excellent in breathability and basis weight, and can provide a polyethylene film for protecting vehicle coating film without static discoloration or strength due to sunlight, and has excellent mechanical strength and elasticity, and has excellent softness and excellent breathability. It was found that the eggplant could provide a new car wrap film. In another aspect, the present invention can provide a fall prevention film that does not form a scratch on the painted surface of the vehicle.

Claims (5)

(A) 5 to 28% by weight of low density polyethylene resin (b) 70 to 93% by weight of linear low density polyethylene resin and (c) 100 parts by weight of polyethylene resin consisting of 2 to 10% by weight of high density polyethylene resin, (B 50-200 parts by weight of inorganic filler and any one of elasticity selected from EVA (ethylene-vinylacetate) resin, EEA (ethylene-ethyl acrylate copolymer), TPE (thermoplastic elastomer), EPDM (ethylene propylene diene monomer) rubber Breathable elastic fall prevention film produced by a polyethylene composition containing 1 to 10 parts by weight of resin. The method of claim 1, (B) The linear low density polyethylene resin is a breathable elastic fall prevention film, characterized in that the linear low density polyethylene consisting of 60 to 80% by weight of non-metallocene-based linear low density polyethylene resin and 40 to 20% by weight of metallocene-based linear low density polyethylene . The method of claim 1, The film is a breathable elastic fall prevention film, characterized in that the antistatic solution mixed with an antistatic agent and a solvent is coated by a spray method or a printing roll method. The method according to any one of claims 1 to 3, The elastic fall prevention film is a breathable elastic fall prevention film, characterized in that the basis weight has a thickness of 50 ~ 150GSM. The method of claim 4, wherein The elastic fall prevention film is breathable elastic fall prevention film, characterized in that the moisture permeability is more than 1500g / ㎡.day.