KR102381474B1 - Anti-fogging composition and fabric comprising the same - Google Patents

Abstract

The present invention provides an anti-fogging composition which comprises: a core-shell composite; alginate; a surfactant; and a solvent, wherein the core-shell composite includes a core including a first acrylic copolymer and a shell located on the core and including a second acrylic copolymer, wherein the first acrylic copolymer comprises a nitrogen-containing hydrophilic monomer, and a fabric comprising the composition.

Description

Anti-fogging composition and fabric comprising the same

The present invention relates to an antifogging composition and a fabric comprising the same.

Fogging is a phenomenon that occurs due to the difference between the surface tension of the substrate and the surface tension of the moisture in contact, the temperature difference and humidity difference between the inside and outside of the substrate, and moisture condensation due to vapor pressure or saturated vapor pressure. It is a phenomenon in which micro-sized water droplets are formed, and the light is scattered by these water droplets and the image is blurred.

As a solution to this, methods for lowering the surface tension of the substrate by using a surfactant have been introduced.

On the other hand, a method of coating the surface of a substrate using an inorganic material with a lower surface tension than water or a method of plasma surface treatment of the substrate has also been proposed, but the antifogging effect is temporary, and it is difficult to use in a place exposed to a fogging environment for a long time. there is a problem.

Accordingly, it is necessary to develop an anti-fog composition that can exhibit an excellent anti-fog effect for a long period of time and quickly exhibit an anti-fogging effect even in an extreme environment with a large temperature and humidity difference.

An object of the present invention is to provide an anti-fogging composition having both durability and quick-acting properties in extreme environments, which can be expected to exhibit an excellent anti-fogging effect for a long period of time, in particular, an improved anti-fogging effect in an environment with a large temperature or humidity difference. it is for

In addition, another object of the present invention is to provide a fabric treated using the antifogging composition.

One embodiment of the present invention is a core-shell composite; alginate; Surfactants; and a solvent, wherein the core-shell composite includes a core including a first acrylic copolymer and a shell disposed on the core, and a shell including a second acrylic copolymer, wherein the first acrylic copolymer contains nitrogen It provides an antifogging composition comprising a hydrophilic monomer containing.

The core-shell composite may include the first acrylic copolymer and the second acrylic copolymer in a weight ratio of 6:4 to 8:2, and satisfy Relational Equation 1 below.

[Relational Expression 1]

20 ≤ Tg ₂ -Tg ₁ ≤ 100

(In Relational Expression 1, Tg ₁ and Tg ₂ are the glass transition temperatures (°C) of the first and second acrylic copolymers, respectively.)

The core may further include a super absorbent polymer.

The antifogging composition, based on 100 parts by weight of the antifogging composition, 10 to 60 parts by weight of the core-shell composite; 1 to 20 parts by weight of the surfactant; 20 to 80 parts by weight of the solvent; and 0.01 to 5 parts by weight of the alginate.

Another embodiment provides a fabric comprising the antifogging composition.

The antifogging composition according to the present invention includes a core-shell composite based on an acrylic copolymer, and by including a nitrogen-containing monomer in the core, it is possible to simultaneously increase the antifogging quick-acting and durability in extreme environments with large temperature and humidity differences. , has the advantage of showing excellent water resistance, heat resistance and chemical resistance.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings commonly understood by those of ordinary skill in the art to which the present invention belongs. In the entire specification, when a part "includes" a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated. The singular also includes the plural, unless the phrase specifically states otherwise.

In the present specification, when a part such as a layer, a film, a region, a plate, a core part, a shell part, etc. is "on" or "on" another part, it is not only in the case of being "on" another part, but also another part in between. This includes cases where

Hereinafter, an antifogging composition according to an embodiment will be described. The composition comprises a core-shell composite; alginate; Surfactants; and a solvent, wherein the core-shell composite includes a core including a first acrylic copolymer and a shell positioned on the core and including a second acrylic copolymer. In addition, the first acrylic copolymer is characterized in that it includes a nitrogen-containing hydrophilic monomer.

In general, air containing a lot of water vapor due to its high temperature easily condenses on a low-temperature surface to form regular fine water droplets. The formation of such fine water droplets is called fogging. The water droplets formed in this way are a kind of adhesive wetting, and they are regularly arranged on the surface by the electrostatic repulsive force acting between the micro water droplets attached to the surface, causing diffuse reflection and blocking the view. In general, the antifogging composition provides a hydrophilicity to the surface of a substrate to lower the surface tension acting between the microdroplets and the surface to form a uniform water film (spreading wetting). The uniformly formed water film minimizes light scattering to prevent fogging. However, the anti-fogging effect by this mechanism is low in durability, and there is a problem in that the anti-fogging effect is significantly reduced, especially in extreme environments with a large temperature or humidity difference.

By including the acrylic copolymer-based core-shell composite according to an embodiment of the present invention, the core absorbs moisture in the air at a high absorption rate, and the shell lowers the surface tension between the microdroplets and the surface to achieve a uniform water film can form. Accordingly, it is possible to continuously exhibit an excellent anti-fogging effect even in an extreme environment.

The core-shell composite may include the first acrylic copolymer and the second acrylic copolymer in a weight ratio of 6:4 to 8:2, and satisfy Relational Equation 1 below.

[Relational Expression 1]

20 ≤ Tg ₂ -Tg ₁ ≤ 100

In Relation 1, Tg ₁ and Tg ₂ are the glass transition temperatures (°C) of the first and second acrylic copolymers, respectively.

In the core-shell composite, when the weight ratio range and the glass transition temperature difference range (Relational Expression 1) are satisfied, a material gradient in which the glass transition temperature increases from the core to the shell direction can be effectively formed. In addition, the core-shell composite may be expanded by moisture absorbed by the core, and the core-shell structure may be destroyed and aggregation between the composites may occur due to the expanded composite. In the present invention, the above-mentioned problems can be improved by adjusting the difference between the weight ratio and the glass transition temperature in the above range, and it is possible to improve water resistance, heat resistance and chemical resistance as well as improve adhesion to the surface of the substrate to achieve a stable antifogging effect for a long time. can indicate

Specifically, the core-shell composite may include the first acrylic copolymer and the second acrylic copolymer in a weight ratio of 6:4 to 8:2 or 6:4 to 7:3, and also the second acrylic copolymer The glass transition temperature difference (Tg ₂ -Tg ₁ ) of the copolymer and the first acrylic copolymer may be 20 to 90°C, or 30 to 80°C. Accordingly, the present invention can form a core-shell composite having a desired glass transition temperature gradient, and in an environment with a large temperature or humidity difference, moisture in the air can pass through the shell and be transferred to and absorbed into the core. When the weight ratio exceeds the above weight ratio range, destruction and agglomeration of the core-shell structure may occur due to water expansion of the composite core, whereas when the weight ratio is below the weight ratio range, moisture in the air is condensed in the shell portion before being absorbed by the core portion. It can form a water film. As a result, it may be difficult to express the performance of the above-described core-shell composite. At the same time, if the glass transition temperature difference range is satisfied, the anti-fogging effect can be rapidly expressed even in extreme conditions where the external air temperature is 0 ° C. or less or the humidity is 80% or more, and at the same time, stable performance can be realized.

The first acrylic copolymer of the core may have a weight average molecular weight of 10,000 to 500,000 g/mol or 20,000 to 400,000 g/mol, and a glass transition temperature (Tg ₁ ) of -50 to -20°C, -50 to -30 °C or -45 to -30 °C. The second acrylic copolymer of the shell may have a weight average molecular weight of 10,000 to 400,000 g/mol or 20,000 to 300,000 g/mol, and a glass transition temperature (Tg ₂ ) of 0 to 50° C., 0 to 40° C. or 5 to 30 °C.

On the other hand, the glass transition temperature (Tg) of the first and second acrylic copolymers can be controlled by the type and content of monomers constituting each copolymer, and can be specifically calculated through Equation 1 below, but the present invention The present invention is not limited thereto.

[Formula 1]

In Equation 1, Tg' is the Tg (absolute temperature) of the acrylic copolymer, W ₁ ', W ₂ ', ... W _n ' is the mass fraction of each monomer with respect to the total monomer component, T ₁ , T ₂ , ... T _n is the glass transition temperature (absolute temperature) of a homopolymer composed of each monomer component.

The first acrylic copolymer forming the core part includes a hydrophobic monomer and a hydrophilic monomer, and the weight ratio of the hydrophobic monomer to the hydrophilic monomer is 0.5:9.5 to 4:6, 1:9 to 4:6, or 1:9 to 3 : could be 7. While securing water resistance in the above range, it is possible to efficiently express the anti-fogging effect.

The hydrophobic monomer may include an acrylic or methacrylic monomer, preferably an alkyl acrylate or alkyl methacrylate having 1 to 20 carbon atoms; aryl acrylate or aryl methacrylate having 6 to 12 carbon atoms; And it may include at least one selected from the group consisting of amino alkyl acrylate or amino alkyl methacrylate. By way of non-limiting example, the hydrophobic monomer may be methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, ethylhexyl acrylate, tridecyl acrylate, stearyl acrylate, benzyl acrylate, phenyl acrylate, dimethyl amino Ethyl acrylate, diethyl aminoethyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, ethylhexyl methacrylate, tridecyl methacrylate, stearyl methacrylate, benzyl It may include at least one selected from the group consisting of methacrylate, phenyl methacrylate, dimethyl aminoethyl methacrylate, and diethyl aminoethyl methacrylate.

The core part may include 10 to 50 parts by weight, 15 to 50 parts by weight, or 20 to 45 parts by weight of the hydrophobic monomer based on 100 parts by weight of the total monomer mixture constituting the first acrylic copolymer.

The hydrophilic monomer is characterized in that it includes a nitrogen-containing hydrophilic monomer. The nitrogen-containing hydrophilic monomer is methylacrylamide, N-methylacrylamide, N,N-dimethylacrylamide, N-ethylmethylacrylamide, N,N-diethylacrylamide, methacrylamidoeryleneurea, N, It may be at least one selected from the group consisting of N-dimethylaminopropyl acrylamide and N,N-dimethylaminoethyl acrylate.

The core part, with respect to 100 parts by weight of the total monomer mixture constituting the first acrylic copolymer, more than 40 parts by weight of the nitrogen-containing hydrophilic monomer, preferably 45 to 90 parts by weight or 50 to 80 parts by weight by including temperature difference or humidity Even in an environment with a large difference, it can quickly absorb moisture in the air and give it a quick-acting effect.

As the first acrylic copolymer forming the core part includes the above-described nitrogen-containing hydrophilic monomer, it can efficiently absorb moisture transmitted through the shell part of the core-shell composite to effectively suppress the formation of a water film on the surface of the substrate. . On the other hand, the suppression of the water film formation may mean that the moisture in the air is condensed on the surface of the substrate to delay the formation of the water film as much as possible. That is, by first absorbing moisture in the air efficiently by the core part, and secondarily by expressing the antifogging effect according to the above-described water film formation, the durability can be significantly increased.

The hydrophilic monomer is dialkyl phosphate, ammonium phosphate ester, ammonium polyoxyethylene sulfate, ammonium polyoxyethylene alkylarylsulfate, polyoxyethylene arylether phosphate, alkyl phosphate, alkylether phosphate, sodium 2-methylpropylene sulfonate, sodium 1 -Allyloxy-2-hydroxy-3-sulfonate propane, 2-acrylamino-2-methyl-1-propane sulfonate acid, sodium vinyl sulfonate, sodium metaallyl sulfonate, sodium methyl sulfonate, sodium p- It may further include one or more selected from the group consisting of styrene sulfonate, sodium allyl sulfonate, sodium cumene sulfonate, sodium xylene sulfonate and sodium toluene sulfonate.

The first acrylic copolymer may further include a functional monomer having one or more crosslinkable functional groups, and preferably may include a hydrophilic monomer having a crosslinking functional group. Specifically, glycidyl (meth) acrylate, (meth) acrylamide, N-2-hydroxyethyl (meth) acrylamide, N, N- dihydroxymethyl (meth) acrylamide, N-butoxy ( Meth)acrylamide, N-methylol (meth)acrylamide, N-methoxymethylol (meth)acrylamide, N-hydroxymethylacrylamide, methylacrylic acid, ethoxyhydroxyethyl (meth)acrylate and methyl It may include one or more selected from the group consisting of glycidyl (meth) acrylate.

The core part may include 10 to 50 parts by weight or 10 to 40 parts by weight of the crosslinking functional monomer based on 100 parts by weight of the total monomer mixture constituting the first acrylic copolymer.

The core part may further include a super absorbent polymer (SAP). Specifically, the superabsorbent polymer is sodium polyacrylate, a cross-linked product of vinyl alcohol-acrylate copolymer, a cross-linked product of maleic anhydride graft polyvinyl alcohol, a cross-linked product of acrylate-methacrylate copolymer, and methyl acrylate-acetic acid. Cross-linked product of saponified product of vinyl copolymer, cross-linked product of starch-acrylate graft copolymer, cross-linked product of saponified product of starch-acrylonitrile graft copolymer, isobutylene-maleic anhydride copolymer It may include at least one selected from the group consisting of a crosslinked product of the copolymer, isobutylene maleic acid copolymer, polyacrylonitrile polymer, polyethylene oxide crosslinking agent, copolyacrylate salt, polyamide and vinylpyrrolidone copolymer. .

By further including a superabsorbent polymer in the core portion, it is possible to exhibit a synergistic effect with the above-described first acrylic copolymer, thereby maximizing antifogging performance in extreme environments. In particular, a stable anti-fogging effect can be expressed even in a low-temperature environment where the external temperature is below 0°C, such as in winter, or in a high-humidity environment with a humidity of 80% or more, such as during the rainy season.

In terms of stably maintaining the structure and particle size of the core-shell composite, the core part is 0.2 to 10 parts by weight, preferably 0.2 to 6 parts by weight, of the superabsorbent polymer, based on 100 parts by weight of the total weight of the core part. parts, more preferably 0.5 to 4 parts by weight.

The core part may have a form covered by the shell part, and it is preferable that the surface of the core part be completely covered by the shell part, but the present invention is not limited thereto.

The shell part may include a second acrylic copolymer, and the second acrylic copolymer may include a hydrophobic monomer and a hydrophilic monomer.

The hydrophobic monomer may include an acrylic or methacrylic monomer, preferably an alkyl acrylate or alkyl methacrylate having 1 to 20 carbon atoms; aryl acrylate or aryl methacrylate having 6 to 12 carbon atoms; And it may include at least one selected from the group consisting of amino alkyl acrylate or amino alkyl methacrylate.

The second acrylic copolymer of the shell part may include 50 to 95 parts by weight, 55 to 90 parts by weight, or 60 to 90 parts by weight of the hydrophobic monomer with respect to 100 parts by weight of the total monomer mixture constituting the second acrylic copolymer. there is. By forming the hydrophobic shell part in the above range, moisture in the air can be efficiently transferred to the core part, thereby expressing the anti-fogging effect according to the moisture absorption of the core part. The transfer of moisture to the core may refer to immersion wetting in which fine water droplets penetrate into fine holes on the surface of the core-shell composite.

The second acrylic copolymer of the shell part may include 5 to 25 parts by weight, 5 to 20 parts by weight, or 10 to 20 parts by weight of a hydrophilic monomer based on 100 parts by weight of the total monomer mixture constituting the second acrylic copolymer. . The hydrophilic monomer may be a sulfur or phosphorus-containing hydrophilic monomer, and specifically, dialkyl phosphate, ammonium phosphate ester, ammonium polyoxyethylene sulfate, ammonium polyoxyethylene alkylaryl sulfate, polyoxyethylene aryl ether phosphate, alkyl phosphate, alkyl Etherphosphate, sodium 2-methylpropylenesulfonate, sodium 1-allyloxy-2-hydroxy-3-sulfonate propane, 2-acrylamino-2-methyl-1-propane sulfonate acid, sodium vinyl sulfonate, sodium Metaallyl sulfonate, sodium methyl sulfonate, sodium p- styrene sulfonate, sodium allyl sulfonate, sodium cumene sulfonate, sodium xylene sulfonate and sodium toluene sulfonate may further include at least one selected from the group consisting of can

The core-shell composite according to the present embodiment can lower the surface tension by including the above-described shell part, and at the same time provide a permeation passage for transferring moisture in the air to the core part. On the other hand, when the surface tension is too high, the surfactant must be used excessively, and it may be difficult to express the performance as a core-shell composite, which is the object of the present invention.

The acrylic copolymer according to the present embodiment may be prepared by general polymerization methods such as free-radical polymerization, cationic ring-opening polymerization, anion-leaving polymerization, cation-living polymerization, etc., but preferably using an initiator It can be prepared by a free-radical polymerization method.

The initiator is azobisisobutyronitrile, 2,2-azobis-2,4-dimethylvaleronitrile, 2,2-azobismethylbutyronitrile and 1,1-azobiscyclohexanecarbonitrile azo initiators such as; peroxide-based initiators such as benzoyl peroxide, cumene hydroperoxide, t-butyl peroxide, t-butyl perbenzoate and methyl ethyl ketone peroxide; persulfate initiators such as ammonium persulfate, t-butyl hydrogen peroxide potassium persulfate, ammonium persulfate and potassium persulfate; persulfates; and peroxides such as hydrogen peroxide and peracetic acid, and these may be used alone or in combination of two or more.

In terms of enabling efficient polymerization and minimizing the content of unreacted monomers in the polymerization process, the initiator may be included in an amount of 1 to 15 parts by weight or 2 to 10 parts by weight based on 100 parts by weight of the total monomer mixture.

The solvent used for the polymerization reaction may include alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, methoxypropanol and diacetone alcohol; alcohol ethers such as methyl carbitol, ethyl carbitol and butyl carbitol; methyl ethyl ketone and methyl isomethyl ethyl ketone and ketones; esters such as methyl acetate, ethyl acetate and butyl acetate; aromatic hydrocarbons such as benzene, toluene and xylene; And amide solvents such as formamide and dimethylformamide can be used, and in view of long-term durability, it is preferable to use an alcohol-based solvent.

The core-shell composite may be particles having an average particle size of 10 to 1000 nm, 50 to 800 nm, or 50 to 500 nm. When the above range is satisfied, since it is effective in terms of dispersion stability of the composition, aggregation between the core-shell composite particles can be prevented.

Based on 100 parts by weight of the antifogging composition according to the present embodiment, 10 to 60 parts by weight of the core-shell composite, preferably 15 to 55 parts by weight, more preferably 20 to 50 parts by weight may be included, but the present invention The present invention is not limited thereto.

The alginate is generally used as a thickener of the composition, but the antifogging effect can be continuously maintained by inhibiting aggregation by suppressing the water expansion of the core-shell complex. The alginate may include alkali salts such as ammonium alginate, potassium salt, sodium salt and lithium salt, but the present invention is not limited thereto.

The alginate may have a polymerization degree of 30 to 100, 50 to 80, or 70 to 80, based on 100 parts by weight of the antifogging composition, 0.01 to 5 parts by weight, 0.01 to 2 parts by weight, 0.01 to 1 parts by weight Or 0.01 to 0.5 parts by weight may be included. When the polymerization degree or content of the alginate is too high, handling of the composition is not easy due to increased viscosity, and it is not preferable because it may precipitate as particles under low temperature conditions.

As long as the surfactant is commonly used in the industry, it may include one or more selected from the group consisting of nonionic and anionic surfactants. Specifically, the nonionic surfactant is at least one selected from the group consisting of sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene glycol, fatty acid akanolamide and polyethylene alkyl ether. The anionic surfactant may include at least one selected from the group consisting of alkyl benzene sulfonate, polyoxyethylene alkyl sulfonate, alkyl phosphate, sodium lauryl ether sulfonate and α-olefin sulfonate. there is.

Based on 100 parts by weight of the antifogging composition, 1 to 20 parts by weight, 5 to 20 parts by weight, or 6 to 15 parts by weight of the surfactant may be included.

The solvent may improve the dispersibility and coatability of the composition by adjusting the viscosity of the antifogging composition. Specifically, the solvent may include one or more selected from the group consisting of an alcohol solvent, an alcohol ether solvent, an ester solvent, an amide solvent, a cellosolve solvent, a ketone solvent, and an alkoxy alcohol solvent. Specific examples include methanol, ethanol, n-propanol, isopropanol, n-butanol and diacetone alcohol; Methylcarbitol, ethylcarbitol and butylcarbitol, methyl acetate, ethyl acetate, butyl acetate, formamide and dimethylformamide, cellosolve acetate, cyclohexanone, isophorone, 3-methoxy-3-methyl-1- butanol and methoxypropanol, but are not limited thereto.

In terms of securing adhesion and abrasion resistance of the antifogging composition, based on 100 parts by weight of the antifogging composition, 20 to 80 parts by weight of the solvent, preferably 30 to 60 parts by weight, may be included.

The antifogging composition according to the present embodiment may further include one or more selected from the group consisting of a curing agent, an acid catalyst, a light stabilizer, an organic acid, a metal oxide, a metal corrosion inhibitor, and a fragrance.

The curing agent may include at least one selected from the group consisting of amino resins, isocyanate group-containing resins, epoxy resins, compounds having polyfunctional hydroxyl groups, and compounds having polyfunctional carboxyl groups. Based on 100 parts by weight of the antifogging composition, 0.5 to 25 parts by weight or 0.5 to 20 parts by weight of the curing agent may be included.

The acid catalyst may include a sulfonic acid-based acid catalyst, and specific examples thereof include naphthalene sulfonic acid-formaldehyde condensate, alkylnaphthalene sulfonic acid, dinosylnaphthalene disulfonic acid, dodecylbenzene sulfonic acid, and para-toluene sulfonic acid. The present invention is not limited thereto. Based on 100 parts by weight of the antifogging composition, 0.5 to 5 parts by weight or 0.5 to 4.5 parts by weight of the acid catalyst may be included.

Based on 100 parts by weight of the antifogging composition, 1 to 20 parts by weight, 5 to 20 parts by weight, or 6 to 15 parts by weight of the surfactant may be included.

The light stabilizer is not particularly limited as long as it is commonly used in the industry. Based on 100 parts by weight of the antifogging composition, 0.5 to 2 parts by weight or 0.5 to 1.5 parts by weight of the light stabilizer may be included.

The organic acid may include at least one selected from the group consisting of succinic acid, tartaric acid, malic acid, and citric acid. In terms of improving the cleaning power of the antifogging composition, 0.1 to 10 parts by weight, 0.1 to 8 parts by weight, or 1 to 8 parts by weight of the organic acid may be included with respect to 100 parts by weight of the antifogging composition.

The metal oxide is intended to increase wear resistance, and may have an average particle size of 10 to 1000 nm, 50 to 800 nm, or 80 to 500 nm. Specifically, the metal oxide may include at least one selected from the group consisting of silica, titania, zirconia, alumina, niobium oxide and tantalum oxide. Based on 100 parts by weight of the antifogging composition, 1 to 20 parts by weight, 1 to 15 parts by weight, or 2 to 10 parts by weight of the metal oxide may be included.

The metal corrosion inhibitor may include at least one selected from the group consisting of sodium silicate, N-methyl morpholine, and N-ethyl morpholine. In terms of effectively preventing the antifogging composition from causing corrosion, with respect to 100 parts by weight of the antifogging composition, 0.01 to 5 parts by weight, 0.01 to 4 parts by weight, or 0.02 to 2 parts by weight of the metal corrosion inhibitor may be included. .

The fragrance is intended to increase satisfaction when used by imparting a fresh fragrance, and may be a commonly used natural or chemically synthesized fragrance. Based on 100 parts by weight of the antifogging composition, 0.01 to 10 parts by weight, 0.05 to 8 parts by weight, or 0.05 to 5 parts by weight of the fragrance may be included.

The antifogging composition according to the present invention can be stored and used in a state contained in a conventional container including a spray pump. For example, after spraying on the surface of the substrate, it can be dried naturally to express the antifogging effect described above. On the other hand, a cleaning effect can be additionally imparted by spraying the antifogging composition and then wiping with a dry cloth.

The substrate may be a resin film or glass, and specifically, a polyethylene terephthalate or polycarbonate resin film; Transparent glass plates of various colors; Functional glass plate such as UV blocking, IR blocking or electromagnetic blocking; glass plates for fire prevention such as wired glass, low-expansion glass, and non-expansion glass; mirrors produced by silver plating and vacuum deposition; And it may be a plate-shaped or curved glass plate, but is not limited thereto.

The present invention also provides a fabric comprising the antifogging composition according to an embodiment of the present invention. The type of the fabric is not particularly limited, but may preferably include a synthetic fiber or natural fiber such as a cellulose-based fabric, a polyester fabric, a polyamide fabric, a nylon fabric, an acrylic fabric, and polyurethane.

More specifically, the fabric may include one or more selected from the group consisting of nonwoven fabric, paper and cloth. The nonwoven fabric may refer to a fabric in which the fibers are entangled without a certain direction to each other to form a sheet-shaped web, and then bonded thereto by a mechanical or physical method. Meanwhile, the paper may be a nonwoven fabric manufactured using the cellulose-based fabric, and the cloth may be a fabric manufactured through a weaving process using the fiber.

The fabric may be manufactured through a natural drying or drying process after immersing the antifogging composition according to an embodiment of the present invention in a diluent diluted 5 to 20 times, but is not limited thereto.

When the base material is wiped with the fabric according to the present invention, as the above-mentioned core-shell composite is uniformly impregnated, the contact angle of the surface of the base material is more than 10° and less than 40°, preferably 15° to 30°, more preferably can be lowered to 20 to 28°. In this case, the surface tension of the substrate may be 25 to 50 mN/m, preferably 30 to 45 mN/m, and more preferably 35 to 38 mN/m. Accordingly, it is possible to suppress the spreading wetting phenomenon of moisture in the air, and to deliver the moisture to the core part of the core-shell composite to express the antifogging effect of the above-described core-shell composite. In this case, the contact angle means a contact angle with respect to water, and the description is the same as described above.

On the other hand, when the contact angle is 10° or less, it may be difficult to express the performance of the core-shell composite desired by the present invention by efficiently forming a water film through extended wetting of moisture on the surface of the substrate. On the other hand, when the contact angle is 40° or more, moisture transfer from the shell part to the core part of the core-shell composite may not be efficient, so that the fast-acting property may be reduced.

As the fabric according to the present invention includes the antifogging composition, it can immediately provide an antifogging effect even in an environment with a large temperature or humidity difference, and has excellent durability. In addition, when the base material is wiped with the fabric, there is no trace and excellent clarity, and even after storing the fabric for a long time, it exhibits excellent retention compared to the initial performance before storage.

The fabric can be applied to fields such as eyeglass cleaner, camera lens cleaner, car cleaner, wiper, frost or fog prevention of bathrooms or windows in homes or hotels, as well as manufacturing hard disks or floppy disks. Process, liquid crystal polarizer, CD and MD manufacturing process, video deck manufacturing process, contact lens manufacturing process, camera assembly, printed circuit board cleaning, pharmaceutical manufacturing process, motion picture film cleaning, semiconductor and integrated circuit manufacturing process It can be applied to various fields such as manufacturing process and cleaning before precision field.

Hereinafter, the present invention will be described in detail with reference to Examples, but these are for describing the present invention in more detail, and the scope of the present invention is not limited by the Examples below.

(Example 1)

Step a) Preparation of core-shell composite

800 g of propanol for polymerization was put into a four-neck flask equipped with a nitrogen inlet, thermometer, stirrer and dropping funnel, and the temperature of the reaction part was raised to 90°C. Next, a polymerization reaction was performed by adding the core composition shown in Table 1 dropwise over 3 hours to prepare a first acrylic copolymer, and then the temperature of the reaction unit was cooled to 50°C. Then, the shell part composition shown in Table 1 was added dropwise over 1 hour at 90° C. to carry out a polymerization reaction, and then cooled to room temperature to obtain a core-shell composite. At this time, the weight ratio of the core part composition and the shell part composition was 6:4, and all polymerization reactions were performed in a nitrogen atmosphere. The average particle size of the finally prepared core-shell composite was 250 nm.

Step b) Preparation of antifogging composition

An antifogging composition was prepared using 40% by weight of the core-shell composite prepared in step a), 0.5% by weight of sodium alginate, 50% by weight of methoxypropanol, and 9% by weight of the surfactant polyoxyethylene glycol.

At this time, sodium alginate (polymerization degree 75) was mixed with methoxypropanol in advance and dissolved by adding a small amount of water.

ingredient content (wt%) core N,N-diethylacrylamide 47 N,N-Dimethylaminoethylmethacrylate 8 methyl methacrylate 23.5 N-methylolacrylamide 15 2,2-Azobis 2-Methylbutyronitrile 6.5 Core part glass transition temperature (Tg ₁ , ℃) -30 shell part alkyl ether phosphate 9 Sodium Toluenesulfonate 9 Butyl methacrylate 75 2,2-Azobis 2-Methylbutyronitrile 7 Shell glass transition temperature (Tg ₂ , ℃) 25

(Examples 2-3)

In step a) of Example 1, the content of the hydrophilic monomer and the hydrophobic monomer in the core part composition was adjusted so that the glass transition temperature of the core part and the shell part became the conditions described in Table 2 below, respectively. An antifogging composition was prepared.

Example 1 Example 2 Example 3 core Glass transition temperature (Tg ₁ , ℃) -30 0 -10 shell part Glass transition temperature (Tg ₂ , ℃) 25 -5 5

(Examples 4-5)

An antifogging composition was prepared in the same manner as in step a) of Example 1, except that the core part composition and the shell part composition were used in a weight ratio of 5:5 and 4:6, respectively, instead of in a weight ratio of 6:4.

(Example 6)

An antifogging composition was prepared in the same manner as in Example 1, except that 2 parts by weight of sodium polyacrylate was further added with respect to 100 parts by weight of the core composition in step a).

(Example 7)

In step b) of Example 1, 40% by weight of the core-shell composite prepared in step a), 0.01% by weight of sodium alginate, 50% by weight of methoxypropanol and 9.99% by weight of the surfactant polyoxyethylene glycol were used. was performed in the same manner to prepare a composition for antifogging.

(Comparative Example 1)

800 g of propanol for polymerization was added to a four-neck flask equipped with a nitrogen inlet, thermometer, stirrer and dropping funnel, and the temperature of the reaction part was raised to 90°C. Next, the core composition shown in Table 1 was added dropwise over 3 hours in a nitrogen atmosphere to carry out a polymerization reaction to prepare an acrylic copolymer. An antifogging composition was prepared using the prepared acrylic copolymer 40% by weight, sodium alginate 0.5% by weight, methoxypropanol 50% by weight, and surfactant 9.5% by weight.

(Comparative Example 2)

800 g of propanol for polymerization was added to a four-neck flask equipped with a nitrogen inlet, thermometer, stirrer and dropping funnel, and the temperature of the reaction part was raised to 90°C. Next, the shell part composition shown in Table 1 was added dropwise over 3 hours in a nitrogen atmosphere to carry out a polymerization reaction to prepare an acrylic copolymer. An antifogging composition was prepared using the prepared acrylic copolymer 40% by weight, sodium alginate 0.5% by weight, methoxypropanol 50% by weight, and surfactant 9.5% by weight.

(Comparative Example 3)

In step a) of Example 1, a first acrylic copolymer was prepared using the shell part composition shown in Table 1, and then the core part composition was added dropwise, and the weight ratio of the shell part composition and the core part composition was 6:4. Thus, an antifogging composition was prepared in the same manner except that a core-shell composite was prepared.

Experimental Example 1: Evaluation of anti-fogging effect at low temperature

The antifogging compositions prepared according to Examples 1 to 7 and Comparative Examples 1 to 3 were air spray-coated to a thickness of 5 μm on a transparent polycarbonate film, respectively, and then dried at 60° C. for 1 minute to prepare a specimen. Next, the anti-fogging effect in low-temperature conditions was evaluated by the following method, and the results are shown in Table 3 below.

The anti-fog layer of the specimen was placed on the upper part of the water tank into which the water was placed to face the water tank side, and the specimen was installed so that the water level in the water tank was 30°. At this time, the distance between the water surface in the water tank and the bottom of the specimen was set to 30 cm. In the above state, while maintaining the temperature of the air (T ₁ ) and the temperature of water in the water tank (T ₂ ) under the conditions described in Table 3 below, the time (minutes) until the water droplets adhering to the surface of the specimen flow down into the water tank was measured.

T ₁ T ₂ Example comparative example One 2 3 4 5 6 7 One 2 3 20℃ 40℃ 10 33 12 20 28 7 9 41 46 43 0℃ 20℃ 32 48 35 40 45 27 34 50 58 52 -5℃ 20℃ 48 66 51 58 62 39 51 75 82 79

In Table 3, T ₁ (℃) is the temperature of the air, T ₂ (℃) is the temperature of the water in the water tank, and each numerical value is the time (minutes) it takes for the water droplet adhering to the surface of the specimen to flow down into the tank. it has been shown

As can be seen in Table 3, in the case of the specimen coated with the antifogging composition according to the present invention, it can be confirmed that the time until the water droplets generated on the surface of the specimen flow down into the water tank all showed lower values compared to the comparative example. It can be seen that the anti-fogging effect was shown. In particular, it can be seen that even in an extreme environment where the temperature of the outside air is low, such as 0°C or -5°C, a remarkably effective anti-fogging effect compared to the comparative example was exhibited.

Experimental Example 2: Persistence evaluation of anti-fogging effect

According to JIS S 4030 standard, the durability of the anti-fogging effect of the anti-fog compositions according to Examples 1 to 7 and Comparative Examples 1 to 3 was evaluated, and the results are shown in Table 4 below.

Experimental Example 3: Heat resistance evaluation

After the specimens according to Examples 1 to 7 and Comparative Examples 1 to 3 were left at 150° C. for 1 hour, it was visually observed whether yellowing, whitening, cracks, and rainbow phenomena occurred on the surface of the anti-fog layer, and the results are shown below. Table 4 shows.

Experimental Example 4: Acid resistance evaluation

Specimens according to Examples 1 to 7 and Comparative Examples 1 to 3 were immersed in 0.5 M sulfuric acid solution for 1 minute and then left in air for 24 hours. Next, the specimen was washed with water and left at room temperature for one hour, and then it was visually observed whether cracks, discoloration, wrinkles, peeling, and swelling occurred on the surface of the anti-fog layer, and the results are shown in Table 4 below.

Experimental Example 5: Alkali resistance evaluation

Specimens according to Examples 1 to 7 and Comparative Examples 1 to 3 were immersed in 0.5M sodium hydroxide solution for 1 minute and then left in air for 24 hours. Next, the specimen was washed with water and left at room temperature for one hour, and then it was visually observed whether cracks, discoloration, wrinkles, peeling, and swelling occurred on the surface of the anti-fog layer, and the results are shown in Table 4 below.

Experimental Example 6: Moisture resistance evaluation

After the specimens according to Examples 1 to 7 and Comparative Examples 1 to 3 were left in a constant temperature and humidity at 50° C. and a relative humidity of 98% for 15 days, yellowing, cracks, wrinkles, whitening, and rainbow phenomena occurred on the surface of the anti-fog layer. It was observed with the naked eye, and the results are shown in Table 4 below.

Experimental Example 7: Thermal shock evaluation

The specimens according to Examples 1 to 7 and Comparative Examples 1 to 3 were left at -40°C for 2 hours, and the process of leaving them at 80°C for 2 hours was repeated 10 times, and then yellowing and whitening on the surface of the anti-fog layer , cracks, wrinkles, and rainbow phenomena were observed with the naked eye, and the results are shown in Table 4.

Experimental Example 8: Water resistance evaluation

Specimens according to Examples 1 to 7 and Comparative Examples 1 to 3 were immersed in water at 40° C. for 15 days and dried for 1 hour. was observed, and the results are shown in Table 4.

Example comparative example One 2 3 4 5 6 7 One 2 3 persistence ○ ○ ○ ○ ○ ○ △ X X X heat resistance ○ ○ ○ ○ ○ ○ ○ △ X △ acid resistance ○ ○ ○ ○ ○ ○ ○ ○ △ △ alkali resistance ○ ○ ○ ○ ○ ○ △ ○ △ △ moisture resistance ○ ○ ○ ○ ○ ○ △ X △ △ heat resistance cycle ○ ○ ○ ○ ○ ○ ○ △ X △ water resistance ○ ○ ○ ○ ○ ○ △ X X X

In Table 4, ○ indicates that the physical properties are good and that no damage or fogging of the antifogging layer is observed at all, △ indicates that deterioration of the physical properties is observed, and X indicates that the physical properties are severely deteriorated and fogging is severe. do.

Experimental Example 9: Performance evaluation of anti-fog fabric

The microfiber cloth was impregnated for 3 minutes in a diluted solution obtained by diluting the antifogging composition prepared according to Examples 1 to 7 and Comparative Examples 1 to 3 10 times, and then dried at 60° C. for 5 minutes to prepare an antifogging fabric.

[ Measurement of contact angle and surface tension]

After rubbing the spectacle lens CR-39 with the fabric three times, the contact angle and surface tension of the spectacle lens surface were measured, and the results are shown in Table 5 below. In this case, the contact angle was measured by a half angle method using a contact angle meter (Tantec Inc.), and the surface tension was measured using a Du-Nouy tensiometer.

[ Measurement of clarity and traces]

After rubbing the spectacle lens CR-39 with the fabric three times, the residual feeling of the spectacle lens surface was measured through visual observation. was checked to measure the clarity. The results are shown in Table 5 below.

[ Measurement of anti-fog effect]

After rubbing the spectacle lens CR-39 with the fabric 3 times, the spectacle lens was exposed to the upper part of a water bath at 90° C. for 5 seconds. Next, the time (seconds) at which the fogging completely disappears was measured, and the results are shown in Table 5 below. At this time, the distance between the glasses range and the water surface in the water tank was set to 5 cm.

[ Measurement of anti-fogging effect durability]

After sealing the fabric in the packaging plastic, after 60 days and 90 days, respectively, the anti-fogging effect was measured in the same manner as the above-described evaluation method, and the retention rate of the anti-fog effect compared to the initial state before sealing was calculated and shown in Table 5 below. it was

Example comparative example One 2 3 4 5 6 7 One 2 3 Contact angle (°) 23 40 28 35 37 25 27 8 43 10 Surface tension (mN/m) 35 46 38 40 42 36 38 21 54 24 scar - - - - - - - * ** * explicit (font size) 3 6 4 4 5 3 3 16 20 18 Anti-fog effect (seconds) 18 32 21 23 29 16 19 38 58 49 Durability of anti-fog effect after 60 days 99% 97% 98% 98% 97% 99% 93% 92% 90% 88% after 90 days 97% 90% 96% 95% 92% 98% 88% 76% 69% 60%

In Table 5, traces were expressed as (-: none), (*: a little), (**: moderate), (***: a lot).

As can be seen in Table 5, in the case of the spectacle lens treated with the antifogging fabric according to the present invention, the contact angle of the spectacle lens surface can be lowered to be more than 10 ° and less than 40 °, and the surface tension is also 25 to 50 mN/m It can be lowered, and it can be seen that the antifogging effect is significantly better than that of the comparative example. In particular, it can be seen that even after long-term storage, high performance retention compared to the initial performance was exhibited, and the results showed no traces and excellent clarity.

Claims (5)

core-shell composites; alginate; Surfactants; and a solvent,
The core-shell composite includes a core including a first acrylic copolymer and a shell positioned on the core and including a second acrylic copolymer,
The first acrylic copolymer includes a nitrogen-containing hydrophilic monomer,
The core-shell composite includes the first acrylic copolymer and the second acrylic copolymer in a weight ratio of 6:4 to 8:2, and an antifogging composition satisfying the following relation 1:
[Relational Expression 1]
20 ≤ Tg ₂ -Tg ₁ ≤ 100
(In Relational Expression 1, Tg ₁ and Tg ₂ are the glass transition temperatures (°C) of the first and second acrylic copolymers, respectively.) delete According to claim 1,
The core further comprises a super absorbent polymer, antifogging composition. According to claim 1,
Based on 100 parts by weight of the antifogging composition, 10 to 60 parts by weight of the core-shell composite; 1 to 20 parts by weight of the surfactant; 20 to 80 parts by weight of the solvent; and 0.01 to 5 parts by weight of the alginate, an antifogging composition. A fabric comprising the antifogging composition of any one of claims 1, 3 and 4.