KR102534750B1 - Multifunctional coating composition for leather and Manufacturing method thereof - Google Patents

Abstract

The present invention relates to a multifunctional leather coating composition and to a manufacturing method thereof, and more specifically, to a multifunctional leather coating composition which can shorten curing time, has excellent scratch resistance, heat resistance, stain resistance, chemical resistance, and color restoration, and is sustainable for a long time, and to a manufacturing method thereof. The multifunctional leather coating composition according to the present invention includes 25 to 175 parts by weight of additives and 25 to 80 parts by weight of a solvent based on 100 parts by weight of a silicone base resin.

Description

Multifunctional coating composition for leather and manufacturing method thereof

The present invention relates to a multifunctional leather coating composition and a method for producing the same, and more specifically, to reduce the curing time, to have excellent scratch resistance, heat resistance, stain resistance, chemical resistance and color restoration, and to be sustainable for a long period of time. It relates to a coating composition and a method for preparing the same.

Leather is processed by peeling off animal skin and is used in various products such as car seats, sofas, and chairs for its unique luxurious texture. Leather is largely classified into natural leather processed from natural animal leather and synthetic leather (artificial leather) that imitates natural leather with a polymer material.

In the case of natural leather, it has excellent ventilation, moisture permeability, elasticity and heat resistance, and is treated as a high-quality material because it has a unique luxurious atmosphere and fragrance. Synthetic leather is an economical alternative to expensive natural leather and does not require chemical treatment. It has the advantage of being easy to process through, but has poor ventilation, moisture permeability, elasticity and heat resistance compared to natural leather, and has a unique chemical odor.

In the case of leather products, they can be used for a long time if they are well managed, and the luxurious feeling unique to leather can be maintained for a long time. Chances are higher.

Accordingly, in order to use leather for a long time, leather care products such as leather lotion and leather cleaner are on the market.

Leather care products can prevent color migration and damage to natural leather, restore and maintain color, and have a water repellent effect. When applied to synthetic leather, they provide flexibility to the surface to prevent cracking and tearing. There are effects that can be done.

However, the leather lotion has a short maintenance period and requires a certain amount of time to absorb, and since the leather cleaner only wipes the surface of the leather, the surface may look clean, but it may cause dryness by evaporating internal moisture.

In addition, when using a leather cleaning product to remove dye, the leather is rather damaged due to exposure to chemicals and excessive friction, so recovery and long-term use are difficult.

The present inventors developed a multi-functional leather coating composition that can shorten the curing time, is applicable to both natural and artificial leather, and has excellent scratch resistance, heat resistance, stain resistance, chemical resistance, color restoration, etc. it has reached

Domestic Patent No. 10-1780642 (Eco-friendly coating composition for natural leather) Korean Patent Registration No. 10-1590141 (liquid composition for surface coating of fabric) Korean Patent Registration No. 10-2469378 (Composition for surface coating of fabric and method of coating fabric using the same)

An object of the present invention to solve the above problems is to provide a multifunctional leather coating composition capable of shortening the curing time, excellent in scratch resistance, heat resistance, antifouling property, chemical resistance and color restoration, and sustainable for a long time, and a method for manufacturing the same. is to provide

The multifunctional leather coating composition of the present invention for solving the above problems includes 25 to 175 parts by weight of an additive and 25 to 80 parts by weight of a solvent based on 100 parts by weight of a silicone-based base resin.

The silicone-based base resin is characterized in that 40 to 60 wt% of the SiO ₂ -based resin and 40 to 60 wt% of the modified silicone resin are mixed.

The additive may include any one of a glycerin fatty acid ester, a photoinitiator, carnauba wax, an emulsifier, a mineral oil, a reaction catalyst, a curing agent, an antibacterial agent, a surfactant, and combinations thereof.

The method for producing a multifunctional leather coating composition of the present invention for solving the above problems is prepared by mixing a mixture of an additive and a solvent and a silicone-based base resin, based on 100 parts by weight of the silicone-based base resin, 25 to 175 parts by weight of the additive , characterized in that it comprises 25 to 80 parts by weight of the solvent.

The silicone-based base resin is characterized in that 40 to 60 wt% of the SiO ₂ -based resin and 40 to 60 wt% of the modified silicone resin are mixed.

The additive may include any one of a glycerin fatty acid ester, a photoinitiator, carnauba wax, an emulsifier, a mineral oil, a reaction catalyst, a curing agent, an antibacterial agent, a surfactant, and combinations thereof.

As described above, according to the multifunctional leather coating composition and its manufacturing method according to the present invention, the curing time can be shortened, scratch resistance, heat resistance, stain resistance, chemical resistance and color restoration are excellent, and long-term sustainable effects are obtained. there is.

1 is an appearance of a leather sample coated with a multifunctional leather coating composition according to the present invention.

Specific features and advantages of the present invention will be described in detail below with reference to the accompanying drawings. Prior to this, if it is determined that the detailed description of functions and configurations related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

The present invention relates to a multifunctional leather coating composition and a method for producing the same, and more specifically, to reduce the curing time, to have excellent scratch resistance, heat resistance, stain resistance, chemical resistance and color restoration, and to be sustainable for a long period of time. It relates to a coating composition and a method for preparing the same.

The multifunctional leather coating composition according to the present invention is prepared by including 25 to 175 parts by weight of an additive and 25 to 80 parts by weight of a solvent based on 100 parts by weight of a silicone-based base resin, and the components will be described in detail below.

silicone base resin

The silicone-based base resin is a mixture of 40 to 60 wt% of the SiO ₂ -based resin and 40 to 60 wt% of the modified silicone resin.

SiO ₂ -based resin is added for the purpose of increasing efficiency such as hardness, adhesion, acid resistance, and scratch resistance.

The SiO ₂ -based resin is hexamethyldisiloxane (C ₆ H ₁₈ OSi ₂ ), decamethylcyclopentasiloxane (C ₁₀ H ₃₀ O ₅ Si ₅ ), and octamethylcyclotetrasiloxane (C ₈ H ₂₄ O ₄ Si ₄ ). dimethyldisilane (C ₂ H ₆ Si 2 ), trimethylchlorosilane ((CH _{3 ) 3} to a SiO ₂ -based base resin including at least one of polydimethylsiloxane (C ₂ H ₆ OSi)n and combinations thereof. SiCl), dimethylchlorosilane ((CH ₃ ) ₂ SiCl ₂ ), phenyldimethylethoxysilane (C ₁₀ H ₁₆ OSi), octadecylsilane (C ₁₈ H ₃₇ Si), octadecyltrichlorosilane (CH ₃ (CH ₂ ) ₁₇ SiCl ₃ ), octadecyltrimethoxysilane (CH ₃ (CH ₂ ) ₁₇ Si(OCH ₃ ) ₃ ), aluminum silicate, magnesium silicate, calcium silicate, and a silicon-based additive including at least one of combinations thereof is a mixture of

In this case, the SiO ₂ -based resin may be used by mixing 20 to 40 wt% of the silicon-based additive with 60 to 80 wt% of the SiO ₂ -based base resin.

The SiO ₂ -based resin may have a weight average molecular weight (Mw) of 1,500 to 29,000, a molecular weight distribution (MWD) of 3.5 or less, an acid value of 100 to 500 mgKOH/g, and a solid content of 50% or more.

The SiO ₂ -based resin can maintain an appropriate viscosity for forming a coating film while having non-tackiness within the weight average molecular weight (Mw) range, and when the molecular weight is out of the above range, it is difficult to use due to excessively high viscosity. Preferably, the SiO ₂ -based resin may have a weight average molecular weight (Mw) of 3,500 to 18,000.

In addition, since the reactivity is excellent within the acid value and solid content ranges, it is preferable to use those within the acid value and solid content ranges.

The SiO ₂ -based resin is added in an amount of 40 to 60 wt% of the total silicon-based base resin. When the SiO ₂ -based resin is added in an amount of less than 40 wt%, heat resistance, chemical resistance, and scratch resistance are insufficient, and the SiO ₂ -based resin is 60 wt%. Since curing is delayed when added in excess of %, it is preferable not to deviate from the above weight range.

Modified silicone resin is added to improve water resistance, weather resistance, heat resistance, durability and scratch resistance, and also has antifouling properties, non-adhesive properties, and enhancement of cleaning ease. The modified silicone resin serves as a chemical intermediate that also enhances the non-adhesiveness of the SiO ₂ -based resin.

The modified silicone resin is dimethyl polysiloxane (di-methyl polysiloxane), methylphenyl polysiloxane (Methyl phenyl polysiloxane), octamethylcyclotetrasiloxane (D4), Siloxanes and Silicones, 3-[(2-aminoethyl)amino]propyl Me , di-Me (CAS No.71750-79-3), silicone oil, organic modifide polysiloxane, and at least one selected from the group consisting of a solution of a Silicone-modified polymer. It can be used that contains.

The modified silicone resin can be prepared by a known method, and is diluted in an organic solvent such as toluene or xylene because of its solid state when the resin content is high, or because it is easy to gel when the condensation reactivity is high. that can be used

The modified silicone resin is added in an amount of 40 to 60 wt% of the total silicone-based base resin. When the modified silicone resin is added in an amount of less than 40 wt%, water resistance, weather resistance, heat resistance, durability and scratch resistance are insufficient, and the SiO ₂ -based resin is When added in excess of 60wt%, the viscosity is too low, making it difficult to form a uniform film, and it is preferable not to deviate from the above weight range because there are limitations in curing delay and buffing.

additive

The additive includes at least one of a glycerin fatty acid ester, a photoinitiator, carnauba wax, an emulsifier, a mineral oil, a reaction catalyst, a curing agent, an antibacterial agent, a surfactant, and combinations thereof.

The additive may be added in an amount of 25 to 175 parts by weight based on 100 parts by weight of the silicone-based base resin.

Preferably, the additives are based on 100 parts by weight of the silicone-based base resin, 1 to 15 parts by weight of glycerin fatty acid ester, 5 to 40 parts by weight of photoinitiator, 0.75 to 5 parts by weight of carnauba wax, 1 to 15 parts by weight of emulsifier, mineral oil 1 to 15 parts by weight, 0.25 to 15 parts by weight of a reaction catalyst, 1 to 20 parts by weight of a curing agent, 5 to 25 parts by weight of an antibacterial agent, and 10 to 25 parts by weight of a surfactant may be added.

Glycerin fatty acid ester is added to control the thickness of the coating film by controlling the viscosity, and to improve coating workability such as spreadability, usability, and spreadability. In addition, there is an effect of preventing heat generation and damage due to friction by lowering the friction coefficient.

Glycerin fatty acid ester may be added in an amount of 1 to 15 parts by weight, preferably 2 to 10 parts by weight, based on 100 parts by weight of the silicone-based base resin.

When the glycerin fatty acid ester is added in less than 1 part by weight based on 100 parts by weight of the silicone base resin, it is difficult to control the viscosity, the effect of preventing heat generation and damage of the coating is insignificant, and when it exceeds 15 parts by weight, the buffing operation and time It is difficult to control and it is preferable not to deviate from the above weight range because process efficiency is reduced, such as a long curing time.

A photoinitiator is added to initiate a double bond of an oligomer by absorbing ultraviolet rays. It may be selected from at least one of paddy-based, hydroxyalkylphenone-based, dialkoxy acetophenone-based, benzyl ketone-based, and combinations thereof.

Preferably, at least one of methyl n-amyl ketone and methyl isobutyl ketone may be included.

The photoinitiator may be added in an amount of 5 to 40 parts by weight, preferably 5 to 25 parts by weight, based on 100 parts by weight of the silicon-based base resin.

When the photoinitiator is added in an amount less than 5 parts by weight based on 100 parts by weight of the silicone-based base resin, drying is slowed down due to a decrease in reactivity by ultraviolet rays, and when it exceeds 40 parts by weight, there is a concern that the appearance of the dry coating film may be defective. It is desirable not to deviate.

Carnauba Wax (Carnauba Wax) has the effect of increasing gloss, coating film durability and protecting leather.

The carnauba wax may use at least one of T1, T3, T4 grades and combinations thereof, preferably, a high purity T1 grade may be used, and when a mixture of T1 grade and other grades is used, T1 It can be mixed so that the grade contains 50 wt% or more.

The higher the content of the carnauba wax, the higher the gloss, the longer the durability, and is used as a protective function of the leather coating. However, the higher the content of the carnauba wax, the more difficult it is to dissolve in the solvent. The wax may be added in an amount of 0.75 to 5 parts by weight, preferably 1 to 3 parts by weight, based on 100 parts by weight of the silicone-based base resin.

Triethanolamine can be used as an emulsifier, and the triethanolamine is a viscous organic compound containing a tertiary amine and a triol and serves as an emulsifier, brightener, detergent, surfactant, moisturizer, softener and pH adjusting agent do

The triethanolamine may be added in an amount of 1 to 15 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the silicone-based base resin.

Mineral oil is a liquid hydrocarbon mixture obtained from petroleum, and its main components are alkane and paraffin.

The mineral oil forms a protective film on the surface to prevent moisture evaporation to increase leather flexibility, protect the leather surface even under poor temperature and humidity conditions such as extremely high temperature, extremely low temperature and extreme dryness, and prevent contamination by microorganisms. , it plays a role in preventing oxidation and denaturation.

It is preferable to use white mineral oil having a purity of 97% or more as the mineral oil.

The mineral oil may be added in an amount of 1 to 15 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the silicone-based base resin.

The reaction catalyst can increase the reaction rate and shorten the curing time after application of the coating composition.

The reaction catalyst is dibutyltin dilaurate (reaction formula: C ₃₂ H ₆₄ O ₄ Sn, CAS Number: 77-58-), dimethyl formal (CAS Number: 109-87-5) and APST (3-Aminopropylsilanetriol, CAS Number: 58160 -99-9) may be used, or two or more may be used in combination.

The reaction catalyst may be added in an amount of 0.25 to 15 parts by weight, preferably 0.25 to 10 parts by weight, based on 100 parts by weight of the silicone-based base resin.

As the curing agent, either trimethylolpropane ethoxylate triacrylate or trimethylolpropane ethoxytriacrylate may be used, or a mixture of two or more may be used.

The curing agent may be added in an amount of 1 to 20 parts by weight, preferably 2 to 15 parts by weight, based on 100 parts by weight of the silicone-based base resin.

An antibacterial agent is added to prevent contamination of the leather coating composition by microorganisms, and any material having antibacterial properties may be used without limitation, but preferably, a silver nano-colloidal solution containing silver nanoparticles having an average particle size of 1 to 50 nm can be used. there is.

Solvents for the silver nano colloid solution include butyl acrylate (n-Butyl Acrylate), methyl ethyl ketone (MEK), kerosene, cyclohexane (C ₆ H ₁₂ ), mineral spirits, isopropyl alcohol ((CH ₃ ) ₂ CHOH), Diisopropyl ether ethanol, xylene (C ₈ H ₁₀ ), acetone, methanol (CH ₃ OH), ethanol (C ₂ H ₅ OH), ethylbenzene, n-butyl Acetate, ethylene glycol diethyl ether (1,2-Diethoxyethane), ethylene glycol monoethyl ether (2-Ethoxyethanol), ethylene glycol ethyl ether (C ₂ H ₅ OCH ₂ CH ₂ OH), carbomer, propanol ( C ₃ H ₈ O), butanol (C ₄ H ₉ OH), dimethicone, glycerol (C ₈ H ₈ O ₃ ), ethylene glycol monoethyl ether acetate (2-Ethoxyethyl acetate), tetrahydrofuran and distilled water Any one or a mixture of two or more selected from the group consisting of may be used.

Preferably, the silver nano-colloidal solution is prepared by mixing silver nano-particles having an average particle size of 1 to 50 nm, silica, alcohol, isopropyl alcohol, and methyl ethyl ketone, stirring and aging for 2 to 5 hours by adjusting the stirring speed to 500 to 1000 rpm per minute do.

The antibacterial agent may be used that has a heat resistance temperature of less than 1,000°C.

The antibacterial agent includes 5 to 25 parts by weight based on 100 parts by weight of the silicone-based base resin. When the antibacterial agent is added at less than 5 parts by weight, the antibacterial effect is insufficient, and when the amount exceeds 25 parts by weight, the increase in antimicrobial activity compared to the amount added is insignificant, which is economical. Can not do it.

As the surfactant, at least one of cationic surfactants, anionic surfactants, nonionic surfactants, and amphoteric surfactants may be selected and used. Preferably, cationic surfactants with low skin irritation may be used, and cationic surfactants may be used. It is also possible to mix and use at least one of nonionic, anionic, and amphoteric surfactants together with an active agent.

The cationic surfactant may include at least one of polyquaternium, dialkyl dimethyl ammonium chloride, dialkyldimethyl, and ammonium chloride, and the nonionic surfactant may include at least one of glyceryl stearate, alkyl polyglucoside APG, and decyl glucoside. may contain one.

Anionic surfactants include sodium laureth sulfate (sodium lauryl ether sulfate (SLES)), sodium cocoyl glutamate, alkyl sulfonates, sodium launyl sulfate (SLS), linear alkyl benzene sulfonates, sodium cocoyl glutamate and sodium cocoyl sulfate. It may contain at least one of apple amino acids, and the amphoteric surfactant is aruryl betaine, cocamidopropyl betaine, disodium cocoamphodiacetate, betaine (N+,O-), cocamidopropyl betaine At least one of lauryl betaine, 2-(8-Heptadecenyl)-4,5-dihydro-1H-imidazole-1-ethanol and 2-(2-Heptadec-8-enyl-2-imidazolin-1-yl)ethanol may include either.

The surfactant may be added in an amount of 10 to 25 parts by weight, preferably 10 to 15 parts by weight, based on 100 parts by weight of the silicone-based base resin.

menstruum

The solvent facilitates viscosity control and application, and the volatilization rate of the solvent is controlled to secure the smoothness and appearance of the coating film.

The solvent may include at least one selected from the group consisting of water, alcohols, ketones, amines, esters, amides, halogenated hydrocarbons, ethers, furans, and combinations thereof.

Specifically, the solvent is 2-butoxyethanol (Butyl cellosolve), butyl acrylate (n-Butyl Acrylate), methyl ethyl ketone (MEK), kerosene, cyclohexane (C ₆ H ₁₂ ), mineral spirit (Mineral spirit ), isopropyl alcohol ((CH ₃ ) ₂ CHOH), diisopropyl ether ethanol (Diisopropyl ether ethanol), xylene (C ₈ H ₁₀ ), acetone, methanol (CH ₃ OH), ethanol (C ₂ H ₅ OH ) (Ethyl alcohol), ethylbenzene, propanol (C ₃ H ₈ O), butanol (C ₄ H ₉ OH), dimethicone, glycerol (C ₈ H ₈ O ₃ ), n-butyl acetate, carbomer (Carbomer), propylene glycol, butyl glycol (2-(2-butoxyethoxy)ethanol), ethylene glycol monoethyl ether acetate (2-Ethoxyethyl acetate), ethylene glycol monoethyl ether (2-Ethoxyethanol), ethylene glycol Ethyl ether (C ₂ H ₅ OCH ₂ CH ₂ OH), ethylene glycol diethyl ether (1,2-Diethoxyethane), 1-Butoxy-2-propanol, 3-methoxy-3-methyl-1-butanol (3- methoxy-3-methyl-1-butanol) and distilled water.

Preferably, the solvent is butyl acrylate (n-Butyl Acrylate) (molecular formula: C ₇ H ₁₂ O ₂ , CAS Number: 141-32-2), methyl ethyl ketone (molecular formula: C ₄ H ₈ O, CAS Number: 78-93-3), cyclohexane (molecular formula: C ₆ H ₁₂ , CAS Number: 110-82-7), and combinations thereof.

The solvent may include 25 to 80 parts by weight based on 100 parts by weight of the silicone-based base resin.

Hereinafter, a method for producing a multifunctional leather coating composition according to the present invention will be described.

The method for producing a multifunctional leather coating composition according to the present invention relates to a method for producing the above-described multifunctional leather coating composition, and the characteristics regarding the role, type, and content of each component are the same as those described above. should be omitted.

The method for producing a multifunctional leather coating composition according to the present invention includes a silicone-based base resin preparation step for preparing a silicone-based base resin, a mixture preparation step for preparing a mixture of additives and a solvent, and a mixing step for mixing the prepared silicone-based base resin and the mixture. includes

The silicone-based base resin preparation step prepares a first molten mixture by preparing 40 to 60 wt% of SiO ₂ -based resin and 40 to 60 wt% of a modified silicone resin and melting them at 25 to 75 ° C. for 90 to 150 minutes, and preparing the first molten mixture. and stirring the mixture at 500 to 1,500 rpm for 30 to 90 minutes and then heating at 25 to 75° C. for 90 to 150 minutes.

In the mixture preparation step, a mixture is prepared by stirring the additive and the solvent at 500 to 1,500 rpm for 90 to 150 minutes. The additive is added after being designed and measured so that 25 to 175 parts by weight and the solvent are 25 to 80 parts by weight based on 100 parts by weight of the silicone-based resin base resin.

At this time, the additives include any one of glycerin fatty acid ester, photoinitiator, carnauba wax, emulsifier, mineral oil, reaction catalyst, curing agent, antibacterial agent, surfactant, and combinations thereof, regarding the role, type and content of each additive Since the characteristics are the same as those described above, a description thereof will be omitted.

In the mixing step, the prepared silicone-based base resin and the mixture are mixed.

In the mixing step, a silicone-based base resin is added to the prepared mixture, heated at 25 to 75 ° C. for 90 to 150 minutes, and then stirred at 500 to 1,500 rpm to prepare a multifunctional leather coating composition.

The multifunctional leather coating composition prepared according to the manufacturing method of the multifunctional leather coating composition of the present invention penetrates into the inside of the leather surface tissue and provides water resistance, adhesion, heat resistance, gloss restoration, flexibility, firmness, durability, and chemical resistance to the leather surface. , scratch resistance and the like can be imparted.

The multifunctional leather coating composition according to the present invention can be applied to both natural leather and synthetic leather, and can be applied to various surfaces such as automobile leather seats, leather bags, leather clothing, leather shoes, leather wallets, leather belts, leather gloves, and leather furniture. It can be used for protection from contamination sources, external forces, external scratches, etc.

In addition, since the curing time after application can be shortened, there is no inconvenience of not using leather products for several hours to several days until the curing performance is expressed compared to conventional products, and the functionality is also maintained for a long time, so the frequency of leather management can be reduced. there is

In addition, the multifunctional leather coating composition of the present invention can be applied to various fabrics such as cotton material, synthetic material, and blended material as well as leather to impart the above functionality.

Hereinafter, the present invention will be described in detail in the following with reference to a preferred embodiment. However, the following examples are intended to specifically illustrate the present invention, and are not limited thereto.

1. Preparation and application of leather coating composition

A SiO ₂ -based resin was prepared by mixing hexamethyldisiloxane (C ₆ H ₁₈ OSi ₂ ) and octadecylsilane (C ₁₈ H ₃₇ Si) at a weight ratio of 7:3. The SiO ₂ -based resin had a weight average molecular weight (Mw) of 5,500, a molecular weight distribution (MWD) of 3, and an acid value of 200 mgKOH/g.

Modified silicone resins include dimethyl polysiloxane, Siloxanes and Silicones, 3-[(2-aminoethyl)amino]propyl Me, and di-Me (CAS No.71750-79-3) in a weight ratio of 8:2. prepared by mixing.

As additives, glycerin fatty acid ester (hereinafter, Additive 1), benzophenone-based photoinitiator (hereinafter, Additive 2), T1 grade carnauba wax (hereinafter, Additive 3), triethanolamine as an emulsifier (hereinafter, Additive 4), white Mineral oil (hereinafter, Additive 5), Dibutyltin dilaurate (reaction formula: C ₃₂ H ₆₄ O ₄ Sn, CAS Number: 77-58-) (hereinafter, Additive 6) as a reaction catalyst, triacrylate (hereinafter, Additive 7) as a curing agent ), silver nano colloidal solution (hereinafter, Additive 8) as an antibacterial agent, and polyquaternium (hereinafter, Additive 9) as a cationic surfactant were prepared.

Solvents include butyl acrylate (n-Butyl Acrylate) (molecular formula: C ₇ H ₁₂ O ₂ , CAS Number: 141-32-2) and cyclohexane (molecular formula: C ₆ H ₁₂ , CAS Number: 110-82-7 ) was used by mixing at a volume ratio of 6:4.

Functional tests were conducted by preparing the prepared raw materials in the composition ratios of Table 1 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 silicon based
base resin SiO2 coefficient paper 25 30 20 20 20 - 10 - modified silicone resin 25 20 30 20 - 5 20 - additive Additive 1 2 2 2 3 - - - - Additive 2 7 7 7 8 - - - - Additive 3 One One One One - - One - Additive 4 2 2 2 3 5 - - - Additive 5 2 2 2 3 - 30 - 35 Additive 6 2 2 2 3 5 5 - - Additive 7 3 3 3 3 7 7 5 7 Additive 8 5 6 6 6 - - - 10 Additive 9 7 8 8 8 10 8 10 8 menstruum 19 17 17 22 25 35 50 35 etc - - - - 28 10 4 5 Total amount (weight) 100 100 100 100 100 100 100 100

Prepare a molten mixture by heating SiO ₂ count paper and modified silicone resin at 65 to 70 ° C for 120 minutes, stir at 800 rpm for 60 minutes, and heat the stirred molten mixture at 65 to 70 ° C for 120 minutes to prepare a silicone-based base resin. did

Separately from the silicone-based base resin, additives and solvents were weighed and mixed as shown in Table 1 above, and stirred at 800 rpm for 120 minutes to prepare a mixture. After heating for 120 minutes, the coating composition was prepared by stirring at 700 rpm.

Examples 1 to 4 and Comparative Examples 1 to 4 were prepared under the same conditions and methods except for changing the composition ratio.

2. Test method

2-1. water resistance

Measurement method: After immersing the fully cured specimen in a constant temperature water bath at 40 ° C for 240 hours and leaving it at room temperature for 1 hour, a peel test is performed to evaluate the adhesiveness of the grid, and the presence or absence of abnormalities in the appearance is visually observed.

Judgment method: After the test, the appearance should be free of softening, whitening, peeling, swelling, discoloration, etc., and there should be no difference in appearance between the deposited and undeposited parts, and the total peeling area should be less than 5% by conducting the adhesion evaluation. As a result, M-1, M-2, M-3, M-4, and M-5 are evaluated in order from excellent to poor in water resistance.

2-2. adhesion test

Measurement method: Test with Nichiban's CT-24 product, use 1 to 20 times to mark the adhesion test.

2-3. stickiness of the coating

Measurement method: It is classified into stages 1 to 5 by touch (1: not sticky to 5: sticky).

2-4. Thickness (㎛)

Measurement method: Measure and mark the film thickness using DeFelsko's PosiTest DFT Ferrous.

2-5. adhesiveness

Measurement method: After treating the finished painted specimen with a heat treatment cycle until it is fully cured, measure the adhesive strength by the checkerboard method at 0.5mm intervals after leaving it at room temperature for 24 hours.

Heat treatment cycle: 150 ° C × 20 minutes, the process of leaving room temperature for 20 minutes was repeated three times, and as a result, M-1, M-2, M-3, M-4, M- marked as 5.

2-6. Heat resistance (℃)

Measurement method: BOSCH's GHG-20-63 product, heat is applied to the temperature, and each coating film is measured.

2-7. Pencil Hardness (H)

Measurement method: Measured by pencil hardness method (H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H hardness measurement that does not damage the coating film with each pencil). H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H are written in order of pencil hardness from thirteen to excellent.

2-8. Gloss restoration rate (%)

Measurement method: After leaving the scratch resistance test specimen at 40 ° C. for 1 hour, the gloss is measured again, and the scratch resistance evaluation gloss increase is divided by the gloss before measurement and expressed as a gloss restoration rate.

2-9. Acid resistance (℃)

Measurement method: After dropping 0.2 ml of 0.1 N sulfuric acid on the test piece, set the temperature of the gradient oven to 35-40 ° C and heat for 150 minutes.

Judgment method: The highest temperature at which no damage occurs is judged as the acid resistance temperature by checking with the naked eye whether etching, staining, or swelling occurs at the site of the test piece where the sulfuric acid solution is dropped.

2-10. chemical resistance

Measurement method: Spray IPA and thinner on the specimen, wait for 20 minutes, and then check for melting or swelling when wiping with a microfiber towel.

2-11. Scratch resistance (%)

Measurement method: 10 round trips were performed using mtec Kistler equipment.

Judgment method: The initial 20-degree gloss of the specimen was measured, and the 20-degree gloss was measured after 10 reciprocations. The gloss retention was calculated by dividing the gloss before the measurement by the gloss after the measurement.

2-12. Solvent resistance (minutes)

Measurement method: After placing a cotton cloth soaked in the test solvent (XYLENE) on the specimen, scratch it with a fingernail 4 times every 1 minute and record the time when the lower coating surface appears.

2-13. Room temperature curing time (minutes)

Measurement method: The first room temperature curing time at 23 ° C without heat treatment was measured every 30 minutes with the naked eye. If it comes out when wiping the painted surface with filter paper, etc., make sure that it does not harden (however, 24 hours are the standard for complete hardening).

2-14. antibacterial

Measurement method: The test was conducted with kikkoman's Lumitester, and a cotton swab was soaked in clean water, swabbed on the test surface (leather), and then inserted into the reagent body. Afterwards, shake it from side to side to react well with the reagent, insert it into the main body of the device, and confirm the resultant numerical value. A case in which 80% or more of the existing bacteria was reduced was considered as a passing criterion.

2-15. color comparison

It is a test that compares the existing surface (leather) and the inspection surface (leather) with the naked eye, and if there is no difference when compared with the existing surface, it was set as a failure criterion.

3. Results

The leather coating composition of Example 1 was applied to natural leather using a brush, and then wiped off with a cloth after application. 1 shows a photograph of a sample applied with a leather coating composition.

No stains were left after construction, and it was confirmed that the coating was uniformly applied as a thin film. In addition, it was confirmed that the color of the surface of the leather where whitening was observed on the surface before application became more vivid.

Table 2 below shows the final goal and test results.

item Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 water resistance M-2 M-2 M-2 M-1 M-3 M-4 M-3 M-5 adhesion test 13 15 13 13 10 5 8 One stickiness of the coating One One One One One 3 One 4 Thickness (um) 25 30 23 22 17 10 16 7 adhesiveness M-1 M-1 M-1 M-1 M-2 M-4 M-2 M-5 Heat resistance (℃) 230 250 200 200 200 80 150 60 Pencil Hardness (H) 8 9 8 8 6 3 5 One Gloss restoration rate (%) 90 95 90 90 50 30 75 20 Acid resistance (℃) 38 43 35 38 35 15 25 5 chemical resistance Good Good Good Good Good X X X Scratch resistance (%) 10 12 10 11 5 2 8 One Solvent resistance (minutes) 9 10 8 9 4 3 5 2 Room temperature curing time (minutes) 90 85 95 60 120 150 100 over 180 antibacterial Good Good Good Good X X X Good color comparison Good Good Good Good Good Good Good Good

Examples 1 to 4 showed excellent results for all test items.

In the case of Comparative Examples 1 to 3, although a silicone-based resin was contained, the SiO ₂ -based resin or modified silicone resin was insufficient, and the performance test results showed values below average due to an insufficient amount of additives.

Comparative Example 4 had excellent antibacterial properties and color restoration due to the excessive addition of antibacterial agent and mineral oil, but the curing time was the longest despite the addition of an excessive amount of curing agent compared to Examples 1 to 4, and significantly lower values for other test items showed

In order to confirm the antifouling properties of the leather coating compositions of Examples 1 to 4 other than the above test items against living pollutants, the leather coating compositions of Examples 1 to 4 were applied and cured on leather fabric, and then board markers, inks, crayons, etc. Contaminated with life contaminants, it was confirmed whether the life contaminants were removed with a dry cloth or wet tissue. As a control, a leather fabric not coated with the leather coating composition was prepared and contaminated in the same way.

As a result, in the case of leather fabrics coated with the leather coating compositions of Examples 1 to 4, it was confirmed that most of the life contaminants to be tested could be easily removed with only a dry cloth and wet tissue without using a leather-only cleaner, and some remaining test subjects life In the case of contaminants, it was confirmed that the contamination source could be easily removed only by using a very small amount of leather-only detergent.

Through this, it was confirmed that the multifunctional leather coating composition according to the present invention can prevent migration and staining by forming a protective film on the leather fabric.

In addition, in order to confirm the functional continuity of the commercially available emulsion-based leather protecting agent and the leather coating composition of Examples 1 to 4, the commercially available emulsion-based leather protecting agent and the leather coating composition of Examples 1 to 4 were applied to leather fabric at intervals of 5 days. Functional tests were performed on the functional test items described in Table 2 above.

As a result, in the case of commercially available emulsion-based leather protectants, the functionality decreased to about 70% on the 10th day of application and to about 45% on the 15th day, whereas when the leather coating compositions of Examples 1 to 4 were applied, the 30th day of application It was confirmed that about 90% of the functionality was maintained until the 60th day, and about 80% was maintained on the 60th day.

Through this, it was determined that the multifunctional leather coating composition of the present invention lasts for a long time and can reduce the hassle of frequent management compared to commercially available emulsion-based leather protectants.

As described above, the present invention has been described with reference to the accompanying drawings, but within the scope that those skilled in the art in the technical field to which the present invention belongs does not deviate from the technical spirit and scope described in the claims of the present invention. In the present invention can be carried out by various modifications or variations. Accordingly, the scope of the present invention should be construed by the claims which are written to include examples of these many variations.

Claims (6)

Based on 100 parts by weight of silicone base resin, 1 to 15 parts by weight of glycerin fatty acid ester, 5 to 40 parts by weight of photoinitiator, 0.75 to 5 parts by weight of carnauba wax, 1 to 15 parts by weight of emulsifier, 1 to 15 parts by weight of mineral oil, reaction 0.25 to 15 parts by weight of a catalyst, 1 to 20 parts by weight of a curing agent, 5 to 25 parts by weight of an antibacterial agent, 10 to 25 parts by weight of a surfactant, and 25 to 80 parts by weight of a solvent,
The silicone-based base resin includes a SiO ₂ -based resin having a weight average molecular weight (Mw) of 1,500 to 29,000,
Characterized in that the antibacterial agent is a silver nano-colloidal solution containing silver nano-particles having an average particle size of 1 to 50 nm
A multifunctional leather coating composition.
According to claim 1,
The silicone-based base resin is
Characterized in that a mixture of 40 to 60 wt% of SiO ₂ -based resin and 40 to 60 wt% of modified silicone resin
A multifunctional leather coating composition.
delete It is prepared by mixing a mixture of an additive and a solvent with a silicone-based base resin, based on 100 parts by weight of the silicone-based base resin, 1 to 15 parts by weight of a glycerin fatty acid ester, 5 to 40 parts by weight of a photoinitiator, 0.75 to 5 parts by weight of carnauba wax , 1 to 15 parts by weight of emulsifier, 1 to 15 parts by weight of mineral oil, 0.25 to 15 parts by weight of reaction catalyst, 1 to 20 parts by weight of curing agent, 5 to 25 parts by weight of antibacterial agent, 10 to 25 parts by weight of surfactant, 25 to 80 parts by weight of solvent Including parts by weight,
The silicone-based base resin includes a SiO ₂ -based resin having a weight average molecular weight (Mw) of 1,500 to 29,000,
Characterized in that the antibacterial agent is a silver nano-colloidal solution containing silver nano-particles having an average particle size of 1 to 50 nm
A method for producing a multifunctional leather coating composition.
According to claim 4,
The silicone-based base resin is
Characterized in that a mixture of 40 to 60 wt% of SiO ₂ -based resin and 40 to 60 wt% of modified silicone resin
A method for producing a multifunctional leather coating composition.
delete

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