WO2023113258A1 - 블록 폴리이소시아네이트 및 이를 포함하는 수용성 클리어 코트 조성물 - Google Patents
블록 폴리이소시아네이트 및 이를 포함하는 수용성 클리어 코트 조성물 Download PDFInfo
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- WO2023113258A1 WO2023113258A1 PCT/KR2022/018098 KR2022018098W WO2023113258A1 WO 2023113258 A1 WO2023113258 A1 WO 2023113258A1 KR 2022018098 W KR2022018098 W KR 2022018098W WO 2023113258 A1 WO2023113258 A1 WO 2023113258A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/80—Masked polyisocyanates
- C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
- C08G18/8083—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with compounds containing at least one heteroatom other than oxygen or nitrogen
- C08G18/809—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with compounds containing at least one heteroatom other than oxygen or nitrogen containing silicon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
- C08G18/3855—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/80—Masked polyisocyanates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08L61/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08L61/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
Definitions
- the present invention relates to a blocked polyisocyanate and a water-soluble clear coat composition containing the same, and more particularly, to a one-component water-soluble blocked polyisocyanate and a water-soluble clear coat composition containing the same.
- the exterior plate of a vehicle body must be free from deterioration and rust of a coating film and must have durability capable of maintaining the gloss or color of the coating film. Therefore, in the painting process of a vehicle, after electrodeposition coating of a vehicle body that has undergone a pretreatment process, intermediate (primer) painting is performed to improve adhesion and smoothness, and base painting is applied to the intermediate painted vehicle body for aesthetics of the vehicle body. . After that, it is common to paint a clear coat to protect the color of the base coat, improve the appearance, and protect the base coat from the outside.
- Korean Patent Registration No. 10-1310616 discloses a water-soluble top coating composition for automobiles applicable to multiple clear coats, but it relates to a water-soluble top coating composition for automobiles applicable as a base coat.
- Korean Patent Registration No. 10-1881216 discloses a water-based paint composition, but it relates to an aqueous paint composition for a base coat of an automobile body that does not include an intermediate coating and a clear coat.
- a coating film obtained by using a paint crosslinked with an isocyanate-based compound may exhibit excellent abrasion resistance, chemical resistance, and contamination resistance.
- a coating film using a non-yellowing polyisocyanate using aliphatic alicyclic diisocyanate as a raw material as an isocyanate component exhibits excellent weatherability, and demand for it is increasing.
- Blocked polyisocyanate has a structure in which an isocyanate group is blocked through a chemical reaction between a blocking agent and at least one isocyanate group.
- the blocking agent is dissociated by heating and the isocyanate group can be regenerated, and such a blocked polyisocyanate has an advantage of excellent processability.
- block polyisocyanates can be used in water-soluble paints by introducing a hydrophilic functional group, the chain is extended as the functional group is added and the molecular weight is greatly increased as the number of added functional groups is increased, impairing the physical properties of the paint. pointed out as a factor.
- Patent Document 1 Republic of Korea Patent Registration No. 10-1310616 (2013.09.13.)
- Patent Document 2 Republic of Korea Patent Registration No. 10-1881216 (2018.07.17.)
- the present invention is intended to provide a one-component water-soluble blocked polyisocyanate having improved water dispersibility that can be used in the production of a water-soluble clear coat.
- Another object of the present invention is to provide a one-component water-soluble clear coat composition containing blocked polyisocyanate.
- the present invention is a blocked polyisocyanate obtained from a polyisocyanate compound and a blocking agent, wherein a first block isocyanate group in which the isocyanate group is blocked by a silane-based blocking agent, and a second block isocyanate group in which the isocyanate group is blocked by a polyalkylene polyol blocking agent and a third blocked isocyanate group in which the isocyanate group is blocked by a pyrazole-based blocking agent.
- the blocked polyisocyanate according to one aspect of the present invention has improved water dispersibility and can be used to prepare a one-component water-soluble clear coat that can be diluted with water.
- the one-component water-soluble clear coat composition according to another aspect of the present invention can be used after being diluted with water and can form a coating film having excellent appearance properties, gloss and scratch resistance.
- the present invention provides blocked polyisocyanates.
- the blocked polyisocyanate of the present invention is obtained from a polyisocyanate compound and a blocking agent.
- the blocked polyisocyanate of the present invention has a first blocked isocyanate group in which the isocyanate group is blocked by a silane-based blocking agent, a second blocked isocyanate group in which the isocyanate group is blocked by a polyalkylene polyol blocking agent, and a pyrazole-based blocking agent. It may contain a third blocked isocyanate group in which the isocyanate group is blocked.
- a polyisocyanate compound is a general term for compounds containing one or more isocyanate groups.
- the polyisocyanate compound may be, for example, a polyisocyanate compound such as an aliphatic polyisocyanate compound, an alicyclic polyisocyanate compound, or an aromatic polyisocyanate compound, but is not limited thereto.
- a polyisocyanate trimer may be used.
- aliphatic polyisocyanate compound examples include trimethylene diisocyanate, 1,2-propylene diisocyanate, and butylene diisocyanate (tetramethylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate), 1,5-pentamethylene diisocyanate (PDI), 1,6-hexamethylene diisocyanate (HMDI), 2,4,4- or 2,2,4-trimethylhexamethylene diisocyanate, 2,6-diisocyanate methyl capate, and the like, but are not limited thereto.
- trimethylene diisocyanate 1,2-propylene diisocyanate
- butylene diisocyanate tetramethylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate
- PDI 1,6-hexamethylene diis
- Examples of the alicyclic polyisocyanate compound include 1,3-cyclopentane diisocyanate, 1,3-cyclopentene diisocyanate, and cyclohexane diisocyanate (1,3- or 1,4-cyclohexane diisocyanate).
- aromatic polyisocyanate compound for example, tolylene diisocyanate (2,4- or 2,6-tolylene diisocyanate or a mixture thereof) (TDI), phenylene diisocyanate (m-, p-phenylene diisocyanate or mixtures thereof), 4,4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate (NDI), diphenylmethane diisocyanate (4,4'-, 2,4'- or 2,2'-diisocyanate phenylmethane diisocyanate or mixtures thereof) (MDI), 4,4'-toluidine diisocyanate (TODI), 4,4'-diphenylether diisocyanate, xylylene diisocyanate (1,3- or 1,4 - xylylene diisocyanate or mixture thereof) (XDI), tetramethylxylylene diisocyanate (1,3- or 1,4-te
- polyisocyanate compound a single compound may be used or two or more types may be used in combination, but is not limited thereto.
- the polyisocyanate compound may be preferred because aliphatic polyisocyanate compounds and alicyclic polyisocyanate compounds are excellent in weather resistance.
- an aliphatic polyisocyanate compound derived from an aliphatic diisocyanate is preferred. More specifically, the aliphatic diisocyanate may be preferably 1,6-hexamethylene diisocyanate trimer in terms of weather resistance and industrial availability, but is not limited thereto.
- a blocked polyisocyanate having an isocyanate group blocked by a blocking agent by using a blocked polyisocyanate having an isocyanate group blocked by a blocking agent, a water-soluble clear coat composition exhibiting excellent physical properties such as appearance, water dispersibility, and scratch resistance can be provided.
- the polyisocyanate compound may be included in an amount of 30 to 60% by weight, or 38 to 50% by weight based on the total weight of the composition for preparing the block polyisocyanate.
- a clear coat composition containing a blocked polyisocyanate having a content of the polyisocyanate compound within the above range is used, a coating film having excellent physical properties such as abrasion resistance, chemical resistance, stain resistance, and scratch resistance can be formed.
- the blocking agent used in the present invention forms a new bond with isocyanate (NCO) in the polyisocyanate compound to block the isocyanate group from reacting with other compounds, for example, a resin part.
- the block isocyanate formed in this way contains a blocked isocyanate group in that the blocking agent can be dissociated through a reaction such as heating, thereby enabling the isocyanate group to participate in the curing reaction again.
- the blocked polyisocyanate may be obtained from 30 to 60 parts by weight of a polyisocyanate compound and 15 to 60 parts by weight of a blocking agent, or 38 to 50 parts by weight of a polyisocyanate compound and 18 to 55 parts by weight of a blocking agent, limited thereto It is not.
- Some isocyanate groups in the blocked polyisocyanate may be included unblocked. More specifically, based on the total isocyanate groups in the polyisocyanate compound, the content of unblocked isocyanate groups is 5 NCO% or less, such as 1 NCO% or less, 0.5 NCO% or less, 0 NCO% (i.e. not including) can be
- a desired water-soluble clear coat composition can be provided.
- the contents are less than the above ranges, the degree of improvement in water dispersibility is insignificant, and when the contents exceed the above ranges, the physical properties of the formed coating film are deteriorated. problems may appear.
- the blocking agent may include a silane-based blocking agent, a polyalkylene polyol blocking agent, and a pyrazole-based blocking agent.
- a blocked isocyanate group can be obtained by reacting with the isocyanate trimer using three types of blocking agents, respectively.
- the water dispersibility of the water-soluble clear coat composition containing blocked isocyanate can be improved, and the physical properties of the coating film formed using the same can be improved.
- the above three types of blocking agents will be described in detail.
- the silane-based blocking agent serves to increase the curing density of the blocked polyisocyanate and improve the scratch resistance of a coating film formed from a clear coat composition containing the same.
- a silane-based blocking agent is a compound having a -Si(OR) n group capable of reacting with isocyanate.
- the silane-based blocking agent may combine with one of the isocyanate trimers to form a first blocked isocyanate group.
- the -Si(OR) n group bonded to isocyanate undergoes a hydrolysis reaction and a self-condensation reaction to form a -Si-O-Si- structure or an organic chemical bond of a -Si-O- structure by heat.
- a silane-based blocking agent may be one having an epoxy group, an amino group, or a combination thereof, but is not limited thereto.
- Silane-based blocking agents are gamma-aminopropyltrimethoxysilane (Silquest A-1100), bis (trimethoxysilylpropyl)amine (Silquest A-1170), bis (triethene) Bis(triethoxysilylpropyl)amine (Siquest Y-11699), Organoalkoxysilane, Silquest Y-96699, 3-Glycidoxypropyl trimethoxysilane, N- (2-aminoethyl) 3-aminopropyltrimethoxysilane (N- (2-aminoethyl) 3-aminopropyltrimethoxysilane), bis-gamma-trimethoxysilylpropylamine, bis-gamma-triethoxysilylpropylamine, and It may include at least one selected from the group consisting of aminopropyltriethoxysilane.
- the silane-based blocking agent may be included in an amount of 2 to 15% by weight, or 6 to 10% by weight based on the total weight of the composition for preparing the blocked polyisocyanate.
- an appropriate siloxane bond is formed to improve adhesion and durability of the coating film.
- the content of the silane-based blocking agent is less than the above range, the number of siloxane bonds is small and the crosslinking density is lowered, resulting in a decrease in adhesion, gloss and durability of the coating film. Due to the hydrolysis caused by the paint storage property is lowered, the appearance of the coating film and scratch resistance may be lowered accordingly.
- the polyalkylene polyol blocking agent serves to control the hydrophilicity of polyisocyanate.
- the polyalkylenepolyol blocking agent can be combined with one of the isocyanate trimers to form a second blocked isocyanate group.
- polyalkylene polyol blocking agent for example, a polyol containing a polyoxyethylene group, more specifically, polyethylene glycol (PEG), polytetramethylene oxide (PTMO), polypropylene oxide (PPO), monoalkoxy polyethylene glycol, polyethylene triol , polypropylene triol alone, or at least one selected from the group consisting of copolymers thereof.
- PEG polyethylene glycol
- PTMO polytetramethylene oxide
- PPO polypropylene oxide
- monoalkoxy polyethylene glycol polyethylene triol
- polypropylene triol alone, or at least one selected from the group consisting of copolymers thereof.
- polyethylene glycol as the polyalkylene polyol blocking agent in view of the hydrophilicity of the block isocyanate and the control of chain extension.
- methoxy polyethylene glycol in terms of blocking isocyanate from the side and increasing the number of hydrophilic groups per molecule.
- the polyalkylene polyol blocking agent may be used alone or in combination with two or more polyalkylene polyols, and the polyalkylene polyol copolymer may be a block copolymer, a graft copolymer, a star copolymer, or an alternating copolymer. .
- the polyalkylene polyol blocking agent may have a number average molecular weight of 200 to 800, for example, 300 to 700 or 400 to 600.
- the efficiency of polyisocyanate blocking may be improved.
- the number average molecular weight of the polyalkylene polyol blocking agent is less than the above range, hydrophilicity is lowered and compatibility of the resin composition is lowered. Appearance and scratch resistance are deteriorated.
- the polyalkylenepolyol blocking agent may be included in an amount of 5 to 17% by weight, or 8 to 13% by weight based on the total weight of the composition for preparing the blocked polyisocyanate.
- an appropriate number of hydrophilic groups is generated to improve storage stability and mechanical properties.
- the content of the polyalkylene polyol blocking agent is less than the above range, the number of hydrophilic groups is small, resulting in a decrease in compatibility of the resin composition. The coating appearance, gloss and scratch resistance may be deteriorated.
- the pyrazole-based blocking agent serves to improve the storage stability of blocked polyisocyanate and to improve the appearance of a coating film formed from a clear coat composition containing the same.
- the pyrazole-based blocking agent may be combined with one of the isocyanate trimers to form a third blocked isocyanate group.
- the pyrazole-based blocking agent may include, for example, at least one selected from the group consisting of pyrazole, 3-methylpyrazole, and 3,5-dimethylpyrazole.
- a blocked polyisocyanate was prepared using 3,5-dimethylpyrazole as a pyrazole-based blocking agent.
- the pyrazole-based blocking agent may be included in an amount of 11 to 23% by weight or 14 to 21% by weight based on the total weight of the composition for preparing the blocked polyisocyanate.
- the pyrazole-based blocking agent is included within the above content range, the storage stability is excellent, and the shrinkage of the coating film is reduced due to the addition reaction when reacting with the resin part, thereby improving the appearance of the coating film.
- the content of the pyrazole-based blocking agent is less than the above range, the isocyanate content after dissociation is small and the reactivity is lowered, and the crosslinking density is insufficient, so that the durability and weather resistance of the prepared coating film may be reduced, and when the content exceeds the above range, the relatively silane-based blocking agent And the content of the polyalkylene polyol blocking agent is reduced, compatibility with the resin composition is lowered, and the crosslinking density is insufficient, so that the impact resistance, chipping resistance, and scratch resistance of the coating film may be lowered accordingly.
- the weight ratio of the silane-based blocking agent, the polyalkylenepolyol blocking agent, and the pyrazole-based blocking agent may be 1:0.3 to 7:0.7 to 10 or 1:0.5 to 5:1 to 8.
- These three blocking agents are used in the above weight ratio to maintain a resin composition and appropriate crosslinking density due to increased reactivity to obtain a clear coat composition having excellent physical properties such as appearance, gloss, adhesion, impact resistance, and scratch resistance as well as water dispersibility.
- the blocked polyisocyanate of the present invention is, for example, first reacted by mixing a polyisocyanate compound and a pyrazole-based blocking agent in a solvent, followed by a second reaction by adding a silane-based blocking agent, and then adding a polyalkylene polyol blocking agent. It can be prepared by a tertiary reaction.
- the primary reaction between the polyisocyanate compound and the pyrazole-based blocking agent may be carried out at 40 to 85 °C, for example, 80 °C, and the secondary and tertiary reactions may be carried out at 60 to 85 °C, for example, 80 °C. there is.
- polyisocyanate in a desired amount may be blocked with each blocking agent.
- unblocked isocyanate may be included in excess, for example, 5 NCO% or more, based on all isocyanate groups, and when carried out above the above range, the dissociation reaction of the formed blocked isocyanate can be performed
- solvent commonly used solvents can be used without limitation, but methyl ethyl ketone, methyl propyl ketone, methyl butyl ketone, ethyl propyl ketone, methyl isobutyl ketone, and methyl aryl ketone that do not react with polyisocyanate and affect water-soluble paints.
- ketone solvents such as diisobutyl ketone, methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, butyl acetate, methyl cellosolve acetate, cellosolve acetate, butyl cellosolve acetate, carbitol acetate, propylene
- An acetate-based solvent such as glycol methyl ether acetate (PMA), an alcohol-based solvent such as butyl cellosolve, or a mixed solvent thereof may be used.
- the blocked polyisocyanate according to the present invention may contain an organic chemical bond of -Si-O-Si- structure or -Si-O- structure by a silane-based blocking agent, and contains a urethane group by a polyalkylene polyol blocking agent and may contain a urea group by a pyrazole-based blocking agent.
- the blocked polyisocyanate of the present invention has technical features in improving water dispersibility and physical properties of a coating film formed from the clear coat composition used by the above three kinds of blocking agents and their content ratio.
- the block polyisocyanate may have a weight average molecular weight (Mw) of 500 to 5,000, for example, 1,000 to 3,000.
- the weight average molecular weight of the block polyisocyanate is within the above range, an appropriate reaction rate is maintained to improve reactivity with the resin, thereby increasing the crosslinking density of the coating film, thereby improving mechanical properties, appearance and chemical resistance.
- the weight average molecular weight of the block polyisocyanate is less than the above-mentioned range, the reactivity is lowered and the compatibility and appearance of the resin composition is lowered. Appearance and scratch resistance are deteriorated.
- the blocked polyisocyanate in forming the blocked polyisocyanate, can be obtained in a mixed state with an unblocked polyisocyanate compound and/or three kinds of blocking agents used for isocyanate blocking and remaining. At this time, the obtained mixture may have a solid content of 70 to 90% by weight, or 75 to 85% by weight in the composition. In one example, a mixture with 80% solids was prepared.
- the blocked polyisocyanate may have an in situ Si(OR 1 ) 3 content of 1 to 11%, or 2 to 10%.
- R 1 is an alkyl group having 1 to 2 carbon atoms.
- Si(OR 1 ) 3 content can be obtained using the formula below.
- Si(OR 1 ) 3 % silane monomer equivalent ⁇ Si(OR 1 ) 3 molecular weight ⁇ F / total content ⁇ 100
- the Si(OR 1 ) 3 content of the blocked polyisocyanate is less than the above range, the number of siloxane bonds is small and the crosslinking density of the coating film is lowered, resulting in a decrease in weather resistance. Due to the hydrolysis caused by the reaction, the paint storage property is lowered, and thus the appearance, gloss and scratch resistance are lowered.
- the block polyisocyanate may have an alkoxide (R 2 O) content in the system of 5 to 15%, or 7 to 12%.
- R 2 is an alkyl group having 1 to 4 carbon atoms.
- alkoxide (R 2 O) content can be obtained using the formula below.
- Alkoxide (R 2 O) content polyalkylene polyol equivalent ⁇ R 2 O molecular weight ⁇ F / total content ⁇ 100
- the alkoxide ((R 2 O)) content of the block polyisocyanate is within the above range, an appropriate number of hydrophilic groups is generated, resulting in excellent storage stability and improved reactivity with resin, thereby increasing the crosslinking density of the coating film, thereby improving mechanical properties, appearance and weather resistance. It has an enhancing effect.
- the alkoxide ((R 2 O)) content of the blocked polyisocyanate is less than the above range, the number of hydrophilic groups is small and the reactivity is lowered, and the compatibility of the resin composition is lowered, and when it exceeds the above range, the hydrophilicity is increased. Water resistance is lowered due to water absorption, and consequently appearance, gloss and scratch resistance are lowered.
- the blocked polyisocyanate according to the present invention can be used as a curing agent in paint compositions, pressure-sensitive adhesive compositions, adhesive compositions, molding agent compositions and the like.
- the present invention can provide a water-soluble clear coat composition comprising the blocked polyisocyanate according to the present invention.
- the water-soluble clear coat composition according to the present invention may contain a water-soluble resin moiety together with the blocked polyisocyanate of the present invention.
- the water-soluble clear coat composition according to the present invention may include 5 to 15 parts by weight of the blocked polyisocyanate and 38 to 140 parts by weight of the water-soluble resin part.
- the water-soluble resin part may include an acrylic dispersion resin, a water-soluble polyester resin, a urethane dispersion resin, an acrylic emulsion resin, and a melamine resin.
- the water-soluble resin part includes 20 to 50 parts by weight of acrylic dispersion resin, 1 to 15 parts by weight of water-soluble polyester resin, 1 to 15 parts by weight of urethane dispersion resin, 1 to 15 parts by weight of acrylic emulsion resin, and 10 to 30 parts by weight of melamine resin. It may contain parts by weight.
- the acrylic dispersion resin serves to improve durability, appearance, and gloss of a coating film formed of a water-soluble clear coat composition.
- the acrylic dispersion resin has a solid content of 40 to 50% by weight based on the total weight of the resin, a weight average molecular weight of 2,500 to 3,500 g / mol, a hydroxyl value of 100 to 150 mgKOH / g, and an acid value of 10 to 20 mgKOH / g, and may have a glass transition temperature of 25 to 35 ° C.
- the water-soluble polyester resin serves to improve the crosslinking density of the water-soluble clear coat composition.
- the water-soluble polyester resin has a solid content of 70 to 80% by weight, a number average molecular weight of 900 to 1,100 g/mol, a hydroxyl value of 100 to 150 mgKOH/g, and an acid value of 15 to 30 mgKOH based on the total weight of the resin. /g, and the viscosity at 25° C. may be V to W Gardner viscosity.
- the urethane dispersion resin serves to impart elasticity to a coating film formed of a water-soluble clear coat composition and to improve gloss, smoothness, and scratch resistance.
- the urethane dispersion resin may have a solid content of 30 to 40% by weight based on the total weight of the resin, a weight average molecular weight of 20,000 to 30,000 g/mol, and a glass transition temperature of -20 to -10°C.
- the acrylic emulsion resin serves to adjust the rheology of the water-soluble clear coat composition.
- the acrylic emulsion resin has a solid content of 35 to 45% by weight based on the total weight of the resin, a weight average molecular weight of 10,000 to 30,000 g / mol, a hydroxyl value of 10 to 100 mgKOH / g, and an acid value of 5 to 30 mgKOH / g, a glass transition temperature of -10 to 45 °C, and a viscosity at 25 °C of 100 to 1,000 cps.
- the melamine resin serves to control the degree of curing and improve the hardness of the water-soluble clear coat composition.
- an alkylated melamine resin (Luwipal072, BASF) was used as the melamine resin.
- the block polyisocyanate may be included in an amount of, for example, 5 to 15% by weight or 6 to 13% by weight based on the total weight of the water-soluble clear coat composition.
- a water-soluble clear coat composition forming a coating film with excellent physical properties was prepared by mixing block polyisocyanate at 7% by weight based on the total weight of the water-soluble clear coat composition.
- the water-soluble clear coat composition according to the present invention has improved water dispersibility and can be used after being diluted with water.
- storage stability and weather resistance can be improved, and a coating film formed using the same can exhibit excellent physical properties such as appearance, gloss, adhesion, impact resistance, hardness, and scratch resistance.
- the water-soluble clear coat composition according to the present invention may further include conventional components included in the water-based paint composition within a range that does not impair the object of the present invention together with the blocked polyisocyanate according to the present invention.
- a rheology modifier e.g., RM12W, DOW
- the water-soluble clear coat composition according to the present invention may contain an organic solvent within a range that does not deteriorate the physical properties of the paint, such as butyl carbitol and dipropylene glycol n-butyl ether. ether), butyl cellosolve, and the like.
- an organic solvent within a range that does not deteriorate the physical properties of the paint, such as butyl carbitol and dipropylene glycol n-butyl ether. ether), butyl cellosolve, and the like.
- the water-soluble clear coat composition according to the present invention may include deionized water (DIW) as an aqueous solvent.
- DIW deionized water
- Block polyisocyanate was prepared by the following method with the compositions shown in Tables 1 and 2 below.
- the HMDI trimer was put into a four-necked flask equipped with a stirrer, thermometer, condenser, and nitrogen inlet pipe, and the temperature was raised to 40°C.
- Dimethylpyrazole (DMP) was added thereto and the temperature was slowly raised. While heating and maintaining the temperature to 80° C. while controlling exotherm, the temperature is maintained until the primary NCO% is 2.4 to 2.7%.
- a silane-based blocking agent (lquest A-1170) was added and maintained at 80°C.
- the secondary NCO% reached 0.9 to 1.2%, methoxy polyethylene glycol was added and maintained at 80°C.
- solvent propylene glycol methyl ether acetate (PMA) and butyl cellosolve were added to terminate the reaction and cooled.
- NCO% was measured in the following way.
- the isocyanate group content is calculated as follows.
- NCO content (%) ⁇ (B-V) ⁇ N ⁇ 0.4202 ⁇ / W(g) ⁇
- V the number of mL of hydrochloric acid consumed for sample titration
- a clear coat composition was prepared by mixing the block polyisocyanates of Examples 1 to 13 and Comparative Examples 1 to 3, a water-soluble resin part, an additive, and a solvent.
- a water-soluble resin part, an additive, and a solvent were added in the same manner, and the block polyisocyanates of Examples 1 to 13 and Comparative Examples 1 to 3 were added to prepare examples and comparative preparation examples of clear coat compositions in Table 5 below. present.
- a primer coating was applied to the electrodeposited steel sheet specimen and cured at 140° C. for 20 minutes to form a primer coating film having a thickness of 30 to 50 ⁇ m. Thereafter, a base coat was applied on the primer coating by bell spraying, and hot air was blown at 80° C. for 3 minutes to evaporate the water remaining in the paint to form a base coating having a thickness of 15 ⁇ m. Thereafter, the clear coat composition prepared in Preparation Example and Comparative Preparation Example was coated on the base coating film and cured at 140 ° C. for 20 minutes to form a clear coating film having a thickness of 40 ⁇ m to prepare a final coating film.
- CF was measured and calculated horizontally and vertically. Horizontal/vertical value of CF. If CF is 79/74 or more, excellent ( ⁇ ), 75/70 or more and less than 79/74 is good ( ⁇ ), 72/67 or more and less than 75/70 is average ( ⁇ ), 72/ If it was less than 67, it was evaluated as defective (x).
- the gloss retention rate (%) was calculated by measuring the 20-degree gloss of the surface of the coating film before and after the test, and then evaluated. . According to the measurement result, if the gloss retention rate (%) is 70% or more, it is excellent ( ⁇ ), if it is 60% or more and less than 70%, it is good ( ⁇ ), if it is 50% or more and less than 60%, it is normal ( ⁇ ), if it is less than 50%, it is bad ( ⁇ ).
- the 20 o gloss of the final coating film was measured by applying a gloss machine (BYK Gardner). According to the measurement results, if the gloss was 91% or more, it was evaluated as excellent ( ⁇ ), 89% or more and less than 91% as good ( ⁇ ), 87% or more and less than 89% as normal ( ⁇ ), and less than 87% as poor ( ⁇ ). .
- the hardness of the clear coating film was measured by the pencil hardness method. Specifically, the maximum hardness without damaging the clear coating film was measured using each of the pencils 2B, B, HB, F, H, and 2H.
- the impact resistance of the final coating film was evaluated according to ASTM D2794.
- a DuPont impact tester was used, and the appearance of the coating film was observed when a 500g weight was dropped on the specimen while changing the drop height of the weight from 30cm to 50cm.
- the final coating film was immersed in a constant temperature water bath at 40 ° C for 240 hours, left at room temperature for 1 hour, and then adhesion was evaluated by the checkerboard method, and discoloration was visually confirmed.
- the check mark method is a method of measuring adhesion by making 100 squares of 2 mm in width and 2 mm in length with a knife on the surface of the clear coating film and then using tape to remove the squares. % or more and less than 100% were evaluated as good ( ⁇ ), and less than 70% as poor ( ⁇ ).
- the measurement result was evaluated as excellent ( ⁇ ) if it was 10 minutes or more, good ( ⁇ ) if it was 7 minutes or more and less than 10 minutes, average ( ⁇ ) if it was 5 minutes or more and less than 7 minutes, and poor ( ⁇ ) if it was 5 minutes or less.
- the final coating film was tested for gloss retention (20 ⁇ gloss), adhesion, and color difference (X-Rite MA98) before and after 1,000 hours of exposure to WOM, an accelerated weather resistance tester.
- the check mark method of item (7) was used for adhesion. If the remaining squares are 100%, the gloss retention is 95% or more, and the color difference value ( ⁇ E) is 1.0 or less, it is excellent ( ⁇ ), and the remaining squares are 100% and glossy. If the retention rate is 90% or more and less than 95% and the color difference value ( ⁇ E) is 1.0 or less, it is good ( ⁇ ), if the remaining square is less than 90%, the gloss retention rate is less than 90%, and the color difference value ( ⁇ E) is more than 1.0, it is bad ( ⁇ ).
- the silane-based blocking agent is effective in improving the scratch resistance, impact resistance and weather resistance of the paint
- the polyalkylene polyol blocking agent is effective in improving the appearance and water resistance
- the pyrazole-based blocking agent was able to confirm that it was effective in improving the gloss of the paint.
- a blocked polyisocyanate containing a group and a third blocked isocyanate group in which the isocyanate group is blocked by a pyrazole-based blocking agent A blocked polyisocyanate containing a group and a third blocked isocyanate group in which the isocyanate group is blocked by a pyrazole-based blocking agent.
- the blocking agent is based on the total weight of the composition for preparing the blocked polyisocyanate, 2 to 15% by weight of a silane-based blocking agent, 5 to 17% by weight of a polyalkylene polyol blocking agent, and 11 to 23% by weight of a pyrazole-based blocking agent Block polyisocyanates, including weight percent.
- Silane-based blocking agent is gamma-aminopropyltrimethoxysilane, bis (trimethoxysilylpropyl) amine, organoalkoxysilane, 3-gram 3-Glycidoxypropyl trimethoxysilane, N-(2-aminoethyl)3-aminopropyltrimethoxysilane, bis-gamma-trimethoxysilane
- a block polyisocyanate comprising at least one selected from the group consisting of silylpropylamine, bis-gamma-triethoxysilylpropylamine, and aminopropyltriethoxysilane.
- the polyalkylene polyol blocking agent is polyethylene glycol (PEG), polytetramethylene oxide (PTMO), polypropylene oxide (PPO), monoalkoxy polyethylene glycol, polyethylene triol, polypropylene triol alone, or a copolymer thereof.
- a block polyisocyanate comprising at least one member selected from the group consisting of polymers.
- the solid content (NV) is 70 to 90% by weight
- the Si(OR 1 ) 3 content is 1 to 11% by weight
- the alkoxide ((R 2 O)) content is 5 to 15% by weight of a blocked polyisocyanate.
- a water-soluble clear coat composition comprising the blocked polyisocyanate according to any one of items (1) to (6) and a water-soluble resin part, wherein the water-soluble resin part is an acrylic dispersion resin, a water-soluble polyester resin, or a urethane dispersant.
- a water-soluble clear coat composition comprising a persion resin, an acrylic emulsion resin, and a melamine resin.
- a water-soluble clear coat composition comprising 5 to 15 parts by weight of a blocked polyisocyanate and 38 to 140 parts by weight of a water-soluble resin part.
- the water-soluble resin part is 20 to 50 parts by weight of acrylic dispersion resin, 1 to 15 parts by weight of water-soluble polyester resin, 1 to 15 parts by weight of urethane dispersion resin, 1 to 15 parts by weight of acrylic emulsion resin, 10 to 15 parts by weight of melamine resin
- a water-soluble clear coat composition comprising 30 parts by weight.
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Abstract
Description
Claims (9)
- 폴리이소시아네이트 화합물 및 블로킹제로부터 얻어지는 블록 폴리이소시아네이트로서,실란계 블로킹제에 의해 이소시아네이트기가 블록되어 있는 제1 블록 이소시아네이트기, 폴리알킬렌폴리올 블로킹제에 의해 이소시아네이트기가 블록되어 있는 제2 블록 이소시아네이트기, 및 피라졸계 블로킹제에 의해 이소시아네이트기가 블록되어 있는 제3 블록 이소시아네이트기를 함유하는 블록 폴리이소시아네이트.
- 청구항 1에 있어서,블로킹제는 블록 폴리이소시아네이트 제조를 위한 조성물의 총 중량을 기준으로, 실란계 블로킹제 2 내지 15 중량%, 폴리알킬렌폴리올 블로킹제 5 내지 17 중량%, 및 피라졸계 블로킹제 11 내지 23 중량%를 포함하는, 블록 폴리이소시아네이트.
- 청구항 1에 있어서,실란계 블로킹제는 감마-아미노프로필트리메톡시실란(Gamma-Aminopropyltrimethoxysilane), 비스(트리메톡시실릴프로필)아민(Bis(trimethoxysilylpropyl)amine), 오가노알콕시실란(Organoalkoxysilane), 3-글라이시독시프로필 트리메톡시실란(3-Glycidoxypropyl trimethoxysilane), N-(2-아미노에틸)3-아미노프로필트리메톡시실란(N-(2-aminoethyl)3-aminopropyltrimethoxysilane), 비스-감마-트리메톡시실릴프로필아민, 비스-감마-트리에톡시실릴프로필아민, 및 아미노프로필트리에톡시실란으로 이루어진 군에서 선택된 1종 이상을 포함하는, 블록 폴리이소시아네이트.
- 청구항 1에 있어서,폴리알킬렌폴리올 블로킹제는 폴리에틸렌글리콜(PEG), 폴리테트라메틸렌옥사이드(PTMO), 폴리프로필렌옥사이드(PPO), 모노알콕시폴리에틸렌글리콜, 폴리에틸렌트리올, 폴리프로필렌트리올 단독, 또는 이들의 공중합체로 이루어진 군에서 선택된 1종 이상을 포함하는, 블록 폴리이소시아네이트.
- 청구항 1에 있어서,피라졸계 블로킹제는 피라졸, 3-메틸피라졸 및 3,5-디메틸피라졸로 이루어진 군에서 선택된 1종 이상을 포함하는, 블록 폴리이소시아네이트.
- 청구항 1에 있어서,블록 폴리이소시아네이트 총 중량을 기준으로, 고형분 함량(NV)이 70 내지 90 중량%이며, Si(OR1)3 함량이 1 내지 11 중량%이며, 알콕사이드((R2O)) 함량이 5 내지 15 중량%인, 블록 폴리이소시아네이트.
- 청구항 1부터 청구항 6 중 어느 한 항에 따르는 블록 폴리이소시아네이트 및 수용성 수지부를 포함하는 수용성 클리어 코트 조성물로서,수용성 수지부는 아크릴 디스퍼젼 수지, 수용성 폴리에스터 수지, 우레탄 디스퍼젼 수지, 아크릴 에멀젼 수지, 및 멜라민 수지를 포함하는,수용성 클리어 코트 조성물.
- 청구항 7에 있어서,블록 폴리이소시아네이트 5 내지 15 중량부 및 수용성 수지부 38 내지 140 중량부를 포함하는, 수용성 클리어 코트 조성물.
- 청구항 7에 있어서,수용성 수지부는 아크릴 디스퍼젼 수지 20 내지 50 중량부, 수용성 폴리에스터 수지 1 내지 15 중량부, 우레탄 디스퍼젼 수지 1 내지 15 중량부, 아크릴 에멀젼 수지 1 내지 15 중량부, 멜라민 수지 10 내지 30 중량부를 포함하는, 수용성 클리어 코트 조성물.
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| US20080220173A1 (en) * | 2004-10-19 | 2008-09-11 | Basf Coatings Aktiengesellschaft | Coating Agents Containing Adducts Having an Alkoxysilane Functionality |
| KR20120003690A (ko) * | 2010-07-05 | 2012-01-11 | 유한회사 피피지코리아 | 실란 변성 블록이소시아네이트를 적용한 내스크래치성 향상 자동차용 일액형 클리어코트 조성물 |
| KR20120103741A (ko) * | 2010-02-08 | 2012-09-19 | 아사히 가세이 케미칼즈 가부시키가이샤 | 블록 폴리이소시아네이트 조성물 및 이것을 포함하는 도료 조성물 |
| KR20200015250A (ko) * | 2018-08-03 | 2020-02-12 | 주식회사 케이씨씨 | 블록 폴리이소시아네이트 및 이를 포함하는 수성 도료 조성물 |
| KR20210013943A (ko) * | 2019-07-29 | 2021-02-08 | 주식회사 케이씨씨 | 수용성 도료 조성물 |
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| KR101310616B1 (ko) | 2011-12-28 | 2013-09-24 | 주식회사 케이씨씨 | 다종 클리어코트에 적용 가능한 자동차용 수용성 상도 도료 조성물 |
| KR101881216B1 (ko) | 2016-09-23 | 2018-07-23 | 주식회사 케이씨씨 | 수성 도료 조성물 |
-
2021
- 2021-12-13 KR KR1020210178140A patent/KR102768409B1/ko active Active
-
2022
- 2022-11-16 CN CN202280081565.XA patent/CN118382654A/zh active Pending
- 2022-11-16 WO PCT/KR2022/018098 patent/WO2023113258A1/ko not_active Ceased
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080220173A1 (en) * | 2004-10-19 | 2008-09-11 | Basf Coatings Aktiengesellschaft | Coating Agents Containing Adducts Having an Alkoxysilane Functionality |
| KR20120103741A (ko) * | 2010-02-08 | 2012-09-19 | 아사히 가세이 케미칼즈 가부시키가이샤 | 블록 폴리이소시아네이트 조성물 및 이것을 포함하는 도료 조성물 |
| KR20120003690A (ko) * | 2010-07-05 | 2012-01-11 | 유한회사 피피지코리아 | 실란 변성 블록이소시아네이트를 적용한 내스크래치성 향상 자동차용 일액형 클리어코트 조성물 |
| KR20200015250A (ko) * | 2018-08-03 | 2020-02-12 | 주식회사 케이씨씨 | 블록 폴리이소시아네이트 및 이를 포함하는 수성 도료 조성물 |
| KR20210013943A (ko) * | 2019-07-29 | 2021-02-08 | 주식회사 케이씨씨 | 수용성 도료 조성물 |
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| KR20230089479A (ko) | 2023-06-20 |
| KR102768409B1 (ko) | 2025-02-13 |
| CN118382654A (zh) | 2024-07-23 |
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