WO2019132415A1 - Fluoropolymer, fluoropolymer composition containing same, and fluoropolymer film using same - Google Patents

Abstract

In one aspect of the present invention, a fluoropolymer represented by chemical formula 1 is provided. The fluoropolymer provided in one aspect of the present invention can obtain low surface energy and high light transmittance, and thus can be applied to various applications requiring such properties. In particular, when coated on glass, the surface energy can be lowered to 19 mN/m or less and the light transmittance can be increased by at least 2%. At the same time, the fluoropolymer has an effect of exhibiting excellent pencil hardness. In addition, the fluoropolymer provided in one aspect of the present invention can be used as a surface coating material and a membrane material for various products due to high solubility in common organic solvents, despite having a very low surface energy during coating. Furthermore, the fluoropolymer has excellent adhesion to the surface of a base material and can be subjected to a curing process, and thus, the fluoropolymer is applicable to various applications such as automobile glass, building exterior material, condensers in power plants, fresh water, and solar batteries, etc.

Description

Fluorine-based polymer, fluorine-based polymer composition containing the same, and fluorine-based polymer membrane using the same

A fluorine-based polymer composition containing the fluorine-based polymer, and a fluorine-based polymer membrane using the same.

Fluorine forms a strong carbon-fluorine bond because it has a high electron density, a small atomic radius next to hydrogen atoms, and strong electronegativity. Due to such fluorine properties, monomers containing a perfluoroalkyl group have a critical surface tension of as low as 6-8 dynes / cm, and surface energy is also very low, repelling both water and oil. As a result, the fluorine-based compound is superior in terms of chemical stability, heat resistance, weatherability, non-stickiness, low surface energy, water repellency and low refractive index.

At present, fluorinated functional materials are widely used as core materials of next generation technologies in optical communication, optoelectronics, semiconductors, automobiles, and computers in high-tech industries because they exhibit excellent performance that can not be realized by other materials due to contamination resistance, weather resistance, heat resistance, . Especially, in the field of consumer electronics, construction, shipbuilding, and civil engineering, which requires a conventional contamination surface property including an antifouling coating such as an outermost layer of a liquid crystal display or a frame of an elegant display, There has been a growing interest in fluorine-based functional materials because of the growing interest in anti-fouling coatings.

Fluoropolymers have properties such as low surface energy, water repellency, lubricity, and low refractive index, along with excellent heat resistance, chemical resistance and weather resistance, and have been widely used in industry, starting from household articles.

However, in the case of conventional fluoropolymers, despite the superiority of the performance (water repellency, contamination prevention, etc.), the material cost is high and the use of general organic solvent is hardly used.

In addition, depending on the type of the base material, problems such as deterioration of the adhesiveness upon coating the base material have occurred. That is, if the fluorine polymer is excellent in adhesiveness to a substrate to be used as a coating material while being well soluble in a common organic solvent while maintaining the performance of the fluorine polymer, its industrial value seems to be very large.

<Prior Art Literature>

<Patent Literature>

Japanese Laid-Open Patent JP-A-1-177111 A

<Non-patent Document>

Colloids and Surfaces A: Physicochem. Eng. Aspects 502 (2016) 159-167

In order to solve the above-mentioned problems, the present inventors have found that the present inventors have found that a fluoropolymer having excellent surface energy and light transmittance similar to that of a conventional fluoropolymer, exhibiting excellent pencil strength, exhibiting excellent adhesion to a substrate and coating stability, And has completed the present invention by confirming that it has the above functions.

An object of one aspect of the present invention is to provide a fluorine-based polymer having high pencil strength and low surface energy while exhibiting excellent solubility in a common organic solvent and adhesion to a substrate surface, and a fluorine-based polymer membrane using the same.

Another object of the present invention is to provide a fluoropolymer composition comprising the fluoropolymer.

In order to achieve the above object, in one aspect of the present invention,

There is provided a fluorine-based polymer represented by the following formula (1).

[Chemical Formula 1]

(In the formula 1,

R _f is C _1-20 fluorinated straight chain alkyl or C _3-20 fluorinated branched chain alkyl;

R _1-4 are each independently hydrogen (H), methyl (CH ₃ ) or a halogen group;

R ₅ is C _1-20 straight chain alkyl or C _3-20 branched chain alkyl;

x is in the range of 45 to 55, y is in the range of 30 to 40, p is in the range of 1-10, and q is in the range of 10-20;

z is 1-5)

In another aspect of the present invention,

There is provided a fluorinated polymer composition comprising the fluorinated polymer represented by the above formula (1) and an organic solvent.

Further, in another aspect of the present invention

There is provided a fluorinated polymer membrane comprising the fluorinated polymer represented by the above formula (1).

Further, in another aspect of the present invention

Preparing a polymer solution by dissolving the fluorine-based polymer in an organic solvent (step 1); And

A step of coating the polymer solution of step 1 on a substrate and drying to form a polymer membrane (step 2).

Further, in another aspect of the present invention

There is provided an optical film comprising the above fluorinated polymer membrane.

The fluorine-based polymer provided in one aspect of the present invention has low surface energy and high light transmittance, and can be applied to various applications requiring such properties. In particular, when coated on glass, the surface energy can be lowered to 19 mN / m or less and the light transmittance can be increased by more than 2%. At the same time, it has an effect of exhibiting excellent pencil strength.

In addition, the fluorine-based polymer provided in one aspect of the present invention can be applied as a surface coating and a membrane material for various products due to its high solubility in common organic solvents even though it has a very low surface energy.

Furthermore, it has excellent adhesion to the surface of the base material and is applicable to various fields such as automobile glass, building exterior material, fresh water, condenser in a power plant, and solar battery.

FIG. 1 is a graph of light transmittance of a fluorinated polymer membrane and a glass substrate (bare glass) prepared by using Examples 1 to 5; FIG.

FIG. 2 is a graph showing the pencil intensity of a polymer membrane prepared by using Examples 1 to 5 and Comparative Example 2. FIG.

In one aspect of the invention,

There is provided a fluorine-based polymer represented by the following formula (1).

[Chemical Formula 1]

(In the formula 1,

R _f is C _1-20 fluorinated straight chain alkyl or C _3-20 fluorinated branched chain alkyl;

R _1-4 are each independently hydrogen (H), methyl (CH ₃ ) or a halogen group;

R ₅ is C _1-20 straight chain alkyl or C _3-20 branched chain alkyl;

x is in the range of 45 to 55, y is in the range of 30 to 40, p is in the range of 1-10, and q is in the range of 10-20;

z is 1-5.)

Hereinafter, the fluorinated polymer according to the present invention will be described in detail.

The fluorinated polymer according to the present invention can be represented by the above formula (1).

For example, in the fluorine-based polymer represented by Formula 1, R _f may be represented by - (CH ₂ ) _a (CF ₂ ) _b -F.

In this case, a may be an integer in the range of 1 to 10, an integer in the range of 1 to 7, and an integer in the range of 1 to 3. B may be an integer ranging from 1 to 15, an integer ranging from 1 to 10, an integer ranging from 1 to 5, and most preferably an integer ranging from 1 to 3.

In addition, for example, R ₁ , R ₂ , R ₃ and R ₄ in the fluorine-containing polymer represented by Formula 1 may each independently be hydrogen (H), methyl (CH ₃ ), and a halogen group. The halogen group may be fluorine (F), chlorine (Cl). Further, it is preferable that R ₁ , R ₂ , R _3, and R ₄ in the fluorine-containing polymer represented by Formula 1 are methyl.

Further, for example, R ₅ in the fluorine-containing polymer represented by Formula 1 may be represented by - (CH ₂ ) _c -CH ₃ .

Here, c may be an integer ranging from 0 to 15, an integer ranging from 1 to 10, and an integer ranging from 1 to 5, but the range of the value c is not limited thereto.

For example, x, y, p and q in the fluorine-based polymer represented by Formula 1 are based on a weight ratio of x + y + p + q = 100, wherein x is 45-55, y is 30-40, p is 1-10, and q is 10-20.

The above x is preferably 45-55, more preferably 46-54, most preferably 47-50. The above-mentioned y is preferably 30-40, more preferably 32-38, most preferably 34-36. Further, p + q may be 30 or less, and may be 25 or less. By weight of the composition can exhibit significantly higher pencil strength with lower surface energy and higher light transmittance.

Also, for example, p is preferably 1-10, may be 1-8, may be 1-5, may be 1-3, and may be 2-3. Or more, it is possible to exhibit excellent tackiness upon coating the substrate.

Further, for example, q is preferably 10-20, may be 12-18, and may be 14-16. The fluorine-containing polymer according to the present invention can be used to form a stable polymer membrane through a curing process.

For example, the number average molecular weight of the fluorinated polymer represented by Formula 1 is preferably 5,000 to 500,000, and more preferably 10,000 to 400,000. If the number average molecular weight of the fluorinated polymer is less than 5,000, the thermal and mechanical strength of the polymer may be decreased. If the number average molecular weight is more than 500,000, the solubility of the fluorinated polymer in the organic solvent may rapidly decrease.

The polymer represented by the general formula (1) provided in one aspect of the present invention can dissolve in a generally known organic solvent unlike the conventional fluorine-based polymer, and thus has a very advantageous effect in the manufacturing process. Examples of the organic solvent include organic solvents such as chloroform, dichloromethane, acetone, pyridine, tetrahydrofuran, chlorobenzene, and dichlorobenzene.

Further, the fluorine-based polymer provided in one aspect of the present invention may be represented by the following general formula (2).

(2)

(In the formula (2)

R _f is C _1-20 fluorinated straight chain alkyl or C _3-20 fluorinated branched chain alkyl;

R ₁ , R ₂ ', R ₂ ", R ₃ and R ₄ are each independently hydrogen (H), methyl (CH ₃ ) or a halogen group;

R ₅ 'is C _2-20 straight chain alkyl or C _3-20 branched chain alkyl;

x is 45 to 55, y 'is 22 to 28, y &quot; is 8 to 12, p is 1 to 10, and q is 10-20;

z is 1-5).

As a specific example, in the fluorine-based polymer represented by Formula 2, R _f may be represented by - (CH ₂ ) _a (CF ₂ ) _b -F.

In this case, a may be an integer in the range of 1 to 10, an integer in the range of 1 to 7, and an integer in the range of 1 to 3. B may be an integer ranging from 1 to 15, an integer ranging from 1 to 10, an integer ranging from 1 to 5, and most preferably an integer ranging from 1 to 3.

In addition, for example, R ₁ , R ₂ ', R ₂ ", R ₃ and R ₄ in the fluorine-containing polymer represented by Formula 2 may each independently be hydrogen (H), methyl (CH ₃ ) The halogen group may be fluorine (F), chlorine (Cl). Furthermore, it is preferable that R ₁ , R ₂ ', R ₂ ", R ₃ and R ₄ in the fluorine-containing polymer represented by Formula 1 are methyl.

For example, in the fluorine-based polymer represented by Formula 2, R ₅ 'may be represented by - (CH ₂ ) _d -CH ₃ .

Here, d may be an integer ranging from 1 to 15, an integer ranging from 1 to 10, and an integer ranging from 1 to 5, but the range of the d value is not limited thereto.

For example, x, y ', y ", p and q in the fluorine-based polymer represented by Formula 2 are based on a weight ratio of x + y' + y" + p + q = y &quot; is 22-28, y &quot; is 8-12, p is 1-10, and q is 10-20.

The above x is preferably 45-55, more preferably 6-54, most preferably 47-50. Further, y '+ y' 'is preferably 30-40, more preferably 32-38, most preferably 34-36. Further, p + q may be 30 or less, and may be 25 or less. By weight of the composition can exhibit significantly higher pencil strength with lower surface energy and higher light transmittance.

Also, for example, p is preferably 1-10, may be 1-8, may be 1-5, may be 1-3, and may be 2-3. Or more, it is possible to exhibit excellent tackiness upon coating the substrate.

Further, for example, q is preferably 10-20, may be 12-18, and may be 14-16. The fluorine-containing polymer according to the present invention can be used to form a stable polymer membrane through a curing process.

In another aspect of the present invention,

There is provided a fluorinated polymer composition comprising the fluorinated polymer represented by Formula 1 or the fluorinated polymer represented by Formula 2 and an organic solvent.

Hereinafter, the fluoropolymer composition according to the present invention will be described in detail.

The fluorine-based polymer is as described above, and the fluorine-based polymer according to the present invention has low surface energy and high light transmittance, and can be applied to various applications requiring such properties. As a composition for such application, it is characterized by having high solubility in an organic solvent.

The organic solvent may be chloroform, dichloromethane, acetone, pyridine, tetrahydrofuran, chlorobenzene, dichlorobenzene or the like, but the organic solvent is not limited thereto.

Further, in another aspect of the present invention

There is provided a fluorinated polymer membrane comprising the fluorinated polymer represented by the formula (1) or the fluorinated polymer represented by the formula (2).

The fluorinated polymer membrane provided in one aspect of the present invention can exhibit very low surface energy and excellent light transmittance. In addition, it has excellent adhesion to the surface of the substrate and can be cured, and thus it can be applied to various fields such as glass for automobiles, building exterior materials, condensers in fresh water or power plants, and solar cells.

Further, in another aspect of the present invention

Preparing a polymer solution by dissolving the fluoropolymer in an organic solvent (step 1); And

A step of coating the polymer solution of step 1 on a substrate and drying to form a polymer membrane (step 2).

Hereinafter, the method for producing the fluorinated polymer membrane according to the present invention will be described in detail for each step.

First, in the method for producing a fluorinated polymer membrane according to the present invention, step 1 is a step of preparing a polymer solution by dissolving the fluorinated polymer as described in the present invention in an organic solvent.

The fluorine-based polymer according to the present invention has excellent solubility with an organic solvent and can be easily dissolved in an organic solvent to prepare a polymer solution.

For example, the organic solvent used in step 1 may be chloroform, dichloromethane, acetone, pyridine, tetrahydrofuran, chlorobenzene, dichlorobenzene or the like, but the organic solvent is not limited thereto.

Next, in the method for producing a fluorinated polymer membrane according to the present invention, step 2 is a step of coating the polymer solution of step 1 on the substrate and drying to form a polymer membrane.

As a specific example, the application of the step 2 may be performed by a method such as spin coating, dip coating, roll coating and spray coating.

Further, in another aspect of the present invention

An optical film comprising the above fluorinated polymer membrane is provided.

In one aspect of the present invention, the optical film may have a structure in which fluorine-based polymer membranes having different transmittances by region (wavelength region) of light are laminated alone or in combination.

In another aspect of the present invention, the optical film may further include a non-fluorinated polymer membrane.

Further, in another aspect of the present invention

The fluorine-containing polymer represented by Formula 1; Organic solvent; And at least one selected from the group consisting of pigments, pigments, dyes, and additives.

Further, in another aspect of the present invention,

And mixing the fluoropolymer with at least one member selected from the group consisting of pigments, dyes and additives, and dissolving the fluoropolymer in an organic solvent.

Hereinafter, the present invention will be described in detail with reference to the following examples and experimental examples.

It should be noted, however, that the following examples and experimental examples are illustrative of the present invention, but the scope of the invention is not limited by the examples and the experimental examples.

&Lt; Example 1 > Preparation of fluorinated polymer 1

(Meth) acrylate, 2,2,3,3,3-pentafluoropropyl methacrylate, stearyl methacrylate, methyl methacrylate, methacrylic acid, 2-hydroxyethyl methacrylate monomer and tetrahydrofuran The reactor was degassed according to the ratios shown in Table 1, followed by repeatedly performing vacuum and nitrogen charging to create a nitrogen atmosphere.

Thereafter, the temperature of the reactor was raised to a temperature of 60 ° C, and the mixture was stirred for about 10 minutes. Next, azobisisobutyronitrile (AIBN) was introduced into the reactor while keeping the nitrogen atmosphere according to the ratio shown in Table 1 below to initiate the polymerization reaction. After the reaction was started for about 15 hours, the reaction mixture was precipitated in a water / methanol mixed solvent to obtain a product. The number average molecular weight and the degree of dispersion of the polymer prepared for preparing the polymer of Example 1 are shown in Table 1 below.

Example 1
2,2,3,3,3-pentafluoropropyl methacrylate [g]	4
Stearyl methacrylate [g]	4
Methyl methacrylate [g]	8
Methacrylic acid [g]	One
2-hydroxyethyl methacrylate [g]	3
Azobisisobutylonitrile (AIBN) [g] < RTI ID = 0.0 >	0.408
Tetrahydrofuran (THF) [g]	40
Molecular weight [Mn]	73,000
Molecular Weight Distribution [PDI]	1.9

&Lt; Example 2 > Preparation of fluorinated polymer 2

Polymerization was carried out under the same reaction conditions as in Example 1, and the content, number average molecular weight and dispersity of the reactants used for preparing the fluoropolymer of Example 2 are shown in Table 2 below.

Example 2
2,2,3,3,3-pentafluoropropyl methacrylate [g]	6
Stearyl methacrylate [g]	4
Methyl methacrylate [g]	6
Methacrylic acid [g]	One
2-hydroxyethyl methacrylate [g]	3
Azobisisobutylonitrile (AIBN) [g] < RTI ID = 0.0 >	0.408
Tetrahydrofuran (THF) [g]	40
Molecular weight [Mn]	78,000
Molecular Weight Distribution [PDI]	1.9

&Lt; Example 3 > Preparation of fluorinated polymer 3

Polymerization was carried out under the same reaction conditions as in Example 1, and the content, number average molecular weight and dispersity of the reactants used for preparing the fluoropolymer of Example 3 are shown in Table 3 below.

Example 3
2,2,3,3,3-pentafluoropropyl methacrylate [g]	8
Stearyl methacrylate [g]	4
Methyl methacrylate [g]	4
Methacrylic acid [g]	One
2-hydroxyethyl methacrylate [g]	3
Azobisisobutylonitrile (AIBN) [g] < RTI ID = 0.0 >	0.408
Tetrahydrofuran (THF) [g]	40
Molecular weight [Mn]	74,000
Molecular Weight Distribution [PDI]	2.1

Example 4 Production of fluorinated polymer 4

Polymerization was carried out under the same reaction conditions as in Example 1, and the content, number average molecular weight and dispersity of the reactants used for preparing the fluoropolymer of Example 4 are shown in Table 4 below.

Example 4
2,2,3,3,3-pentafluoropropyl methacrylate [g]	10
Stearyl methacrylate [g]	4
Methyl methacrylate [g]	2
Methacrylic acid [g]	One
2-hydroxyethyl methacrylate [g]	3
Azobisisobutylonitrile (AIBN) [g] < RTI ID = 0.0 >	0.408
Tetrahydrofuran (THF) [g]	40
Molecular weight [Mn]	71,000
Molecular Weight Distribution [PDI]	2.1

&Lt; Example 5 > Preparation of fluorinated polymer 5

Polymerization was carried out under the same reaction conditions as in Example 1, and the content, number average molecular weight and dispersity of the reactants used for preparing the fluoropolymer of Example 5 are shown in Table 5 below.

Example 5
2,2,3,3,3-pentafluoropropyl methacrylate [g]	12
Stearyl methacrylate [g]	4
Methacrylic acid [g]	One
2-hydroxyethyl methacrylate [g]	3
Azobisisobutylonitrile (AIBN) [g] < RTI ID = 0.0 >	0.408
Tetrahydrofuran (THF) [g]	40
Molecular weight [Mn]	98,000
Molecular Weight Distribution [PDI]	2.9

&Lt; Comparative Example 1 &

Polymerization was carried out under the same reaction conditions as in Example 1, and the content, number average molecular weight and dispersity of the reactants used for preparing the fluorinated polymer of Comparative Example 1 are shown in Table 6 below.

Comparative Example 1
2,2,3,3,3-pentafluoropropyl methacrylate [g]	20
Azobisisobutylonitrile (AIBN) [g] < RTI ID = 0.0 >	0.408
Tetrahydrofuran (THF) [g]	40
Molecular weight [Mn]	95,000
Molecular Weight Distribution [PDI]	2.7

&Lt; Comparative Example 2 &

Polymethyl methacrylate (PMMA) polymer was prepared.

<Experimental Example 1> Analysis of fluorine-based polymer composition

In order to confirm the compositions of the fluoropolymers prepared in Examples 1 to 5 according to the present invention, the fluoropolymers prepared in Examples 1 to 5 were dissolved in chloroform (CDCl ₃ ), and then nuclear magnetic resonance spectroscopy (NMR, Bruker AC 500P &lt; 1 &gt; H NMR spectrometer). The results are shown in Table 7 below. The composition of the polymer was calculated from the peak area ratio of the graph analyzed by nuclear magnetic resonance spectroscopy. The results are shown in Table 7.

	Input ratio (Weight%)	Composition ratio (Weight%)
	A: B: C: D: E
Example 1	20: 20: 40: 5: 15	21: 23: 37: 2: 16
Example 2	30: 20: 30: 5: 15	29: 21: 29: 6: 15
Example 3	40: 20: 20: 5: 15	42: 19: 19: 3: 17
Example 4	50: 20: 10: 5: 15	48: 24: 11: 2: 15
Example 5	60: 20: 0: 5: 15	61: 21: 0: 2: 16

A: 2,2,3,3,3-pentafluoropropyl methacrylate B: stearyl methacrylate

C: methyl methacrylate

D: methacrylic acid

E: 2-hydroxyethyl methacrylate

As shown in Table 7, it was confirmed that the compositions of the fluoropolymers prepared in Examples 1 to 5 were almost the same as those of the monomers.

<Experimental Example 2> Evaluation of surface roughness, contact angle and surface energy

Preparation of fluorine-based polymer membrane

The polymers prepared in Examples 1 to 5 and Comparative Example 1 were dissolved in chloroform at a concentration of 2% by weight, dropped on a cleaned glass slide having a diameter of 1.5 cm, and dried at a rate of 3,000 rpm for 40 seconds Polymer membranes were prepared for surface roughness, contact angle and surface energy evaluation by spin coating at the application time and drying at room temperature for 12 hours in a vacuum oven.

(1) Measurement of surface roughness

The surface roughness of the polymer membranes prepared above was measured using an atomic force microscope (Model: SPA 400, manufactured by Seiko Instruments Industry, Co., Ltd., Japan), and the results are shown in Table 8 below.

(2) Evaluation of contact angle

The contact angles of the prepared polymer membranes were measured using a contact angle meter (Kruss DSA10, Germany), and the contact angles measured by dropping water and diiodomathane (DMI) on the polymer membranes were shown in Table 7 Respectively.

For reference, when the contact angle is smaller than 90 degrees, spherical droplets lose their shape on the solid surface and exhibit hydrophilic properties that wet the surface. In addition, when the contact angle is larger than 90 degrees, spherical droplets exhibit hydrophobicity that flows easily along the external force without wetting the surface while maintaining the shape of the spheres on the solid surface.

(3) Evaluation of surface energy

The surface energy of the polymer membranes prepared above was calculated. Specifically, the surface energy was calculated using the Owens-Wendt-Rabel-Kaelble method after measuring the contact angle using water and a diiodomathane (DMI) solvent.

	Contact angle (degree)		Surface energy (mN / m)	Surface roughness (mN / m)
	H 2 O	diiodomathane (DMI)
Comparative Example 1	75.6	35.1	44.3	<2 nm
Example 1	97.0	63.9	26.7	<2 nm
Example 2	101.1	69.7	23.3	<2 nm
Example 3	102.5	70.8	22.6	<2 nm
Example 4	103.3	78.4	18.8	<2 nm
Example 5	104.5	81.2	17.4	<2 nm

As shown in Table 8, the contact angle of the polymer membrane prepared in Comparative Example 1 to water was 75.6 °, while the contact angle of the fluorinated polymer membrane of the present invention was 97 ° to 104.5 °. In addition, in the case of the contact angle with respect to DMI, it was confirmed that the polymer membrane prepared in Comparative Example 1 was 35.1 °, while the contact angle of the fluorinated polymer membrane in Examples 1 to 5 was remarkably excellent from 63.9 ° to 81.2 °.

Further, as shown in Table 8, the surface energy of the polymer membrane prepared in Comparative Example 1 was 44.3 mN / m, while the surface energies of the fluorine-based polymer membranes of Examples 1 to 4 were 17.4 mN / m to 26.7 mN / m, which is very low. In particular, it can be seen that the surface energy of the fluorinated polymer membrane of Example 5 is PTFE (surface energy ~ 18 mN / m), which is known to have a very low surface energy, and a much lower number of cations.

<Experimental Example 3> Light transmittance analysis

In order to confirm the light transmittance of the fluorinated polymer membrane according to the present invention, the light transmittance of the fluorinated polymer membrane prepared using the fluorinated polymers of Examples 1 to 5 and the glass substrate (bare glass) was measured using a Varian Cary 5000 spectrometer ) In a wavelength range of 200 nm to 800 nm, and the results are shown in FIG.

As shown in Fig. 1, it was confirmed that the transmittance of the fluorinated polymer membrane obtained in Example 4 was far superior to that of the glass substrate and other fluorinated polymer membranes. In particular, it was confirmed that the transmittance was excellent in the wavelength range of 350 nm to 700 nm, and the transmittance was much better in the wavelength range of 450 nm to 600 nm.

<Experimental Example 4> Pencil hardness analysis

In order to confirm the pencil hardness of the fluorinated polymer membrane according to the present invention, the pencil hardness of the polymer membrane prepared using the fluorinated polymer of Examples 1 to 5 and the PMMA polymer of Comparative Example 2 was measured using a hardness analyzer (BGD 506, Biuged Instruments Co., Ltd., Guangzhou), and the results are shown in Fig.

As shown in FIG. 2, it was confirmed that the pencil strength of the fluorinated polymer membrane obtained from Example 4 was much higher than that of the polymer membrane using the PMMA polymer of Comparative Example 2 as F (5).

In addition, it was confirmed that the composition range of the fluorine-based polymer was far superior to that of the fluorine-based polymer membranes obtained in Examples 1, 2, 3 and 5 in which the x value was outside the range of 45-55.

As described above, the fluorine-based polymer according to the present invention has low surface energy and high light transmittance, and can be applied to various applications requiring such properties. In particular, it was confirmed that the surface energy can be lowered to 19 mN / m or less when the glass is coated, and the light transmittance can be increased by 2% or more. In addition, the pencil strength showed a value of F (5), and it was confirmed that the pencil strength was much superior to that of the PMMA polymer and other fluorinated polymers. Furthermore, it is excellent in light transmittance and pencil strength and can be widely applied as an optically applied material (optical film).

In addition, although the fluorine-based polymer according to the present invention has a very low surface energy upon coating, it can be applied to surface coatings and membrane materials of various products due to high solubility in common organic solvents. Further, it is excellent in adhesion to the surface of the substrate and can be cured, which is applicable to various fields such as automobile glass, building exterior material, condenser in a fresh water or a power plant, a solar cell, and a light collector.

Claims (11)

1. The fluorine-containing polymer represented by the following formula (1)

   [Chemical Formula 1]

   

   (In the formula 1,

   R _f is C _1-20 fluorinated straight chain alkyl or C _3-20 fluorinated branched chain alkyl;

   R _1-4 are each independently hydrogen (H), methyl (CH ₃ ) or a halogen group;

   R ₅ is C _1-20 straight chain alkyl or C _3-20 branched chain alkyl;

   x is in the range of 45 to 55, y is in the range of 30 to 40, p is in the range of 1-10, and q is in the range of 10-20;

   z is 1-5).
2. The method according to claim 1,

   Wherein the fluorine-based polymer has a number average molecular weight of 5,000 to 500,000.
3. The method according to claim 1,

   Wherein the fluorine-based polymer is dissolved in an organic solvent.
4. A fluorine-based polymer composition comprising a fluorine-based polymer represented by the following formula (1) and an organic solvent:

   [Chemical Formula 1]

   

   (In the formula 1,

   R _f is C _1-20 fluorinated straight chain alkyl or C _3-20 fluorinated branched chain alkyl;

   R _1-4 are each independently hydrogen (H), methyl (CH ₃ ) or a halogen group;

   R ₅ is C _1-20 straight chain alkyl or C _3-20 branched chain alkyl;

   x is in the range of 45 to 55, y is in the range of 30 to 40, p is in the range of 1-10, and q is in the range of 10-20;

   z is 1-5).
5. 5. The method of claim 4,

   Wherein the organic solvent is at least one selected from the group consisting of chloroform, dichloromethane, acetone, pyridine, tetrahydrofuran, chlorobenzene, and dichlorobenzene.
6. 1. A fluorinated polymer membrane comprising a fluorinated polymer represented by the following formula (1): &lt; EMI ID =

   [Chemical Formula 1]

   

   (In the formula 1,

   R _f is C _1-20 fluorinated straight chain alkyl or C _3-20 fluorinated branched chain alkyl;

   R _1-4 are each independently hydrogen (H), methyl (CH ₃ ) or a halogen group;

   R ₅ is C _1-20 straight chain alkyl or C _3-20 branched chain alkyl;

   x is in the range of 45 to 55, y is in the range of 30 to 40, p is in the range of 1-10, and q is in the range of 10-20;

   z is 1-5).
7. Preparing a polymer solution by dissolving the fluoropolymer of claim 1 in an organic solvent (step 1); And

   (2) coating the polymer solution of the step (1) on a substrate and drying the polymer solution to form a polymer membrane (step 2).
8. An optical film comprising the fluoropolymer film of claim 6.
9. 9. The method of claim 8,

   Wherein the optical film further comprises a non-fluorinated polymer membrane.
10. A fluorine-based polymer represented by the following formula (1); Organic solvent; And at least one selected from the group consisting of pigments, pigments, dyes and additives.

    [Chemical Formula 1]

    

    (In the formula 1,

    R _f is C _1-20 fluorinated straight chain alkyl or C _3-20 fluorinated branched chain alkyl;

    R _1-4 are each independently hydrogen (H), methyl (CH ₃ ) or a halogen group;

    R ₅ is C _1-20 straight chain alkyl or C _3-20 branched chain alkyl;

    x is in the range of 45 to 55, y is in the range of 30 to 40, p is in the range of 1-10, and q is in the range of 10-20;

    z is 1-5).
11. A process for producing a coating composition, which comprises mixing the fluoropolymer of claim 1 with at least one selected from the group consisting of pigments, dyes and additives, and dissolving the fluoropolymer in an organic solvent.

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