EP3609944A1 - Produit organique réactif et son utilisation comme agent réticulant dans des revêtements auto-cicatrisants - Google Patents
Produit organique réactif et son utilisation comme agent réticulant dans des revêtements auto-cicatrisantsInfo
- Publication number
- EP3609944A1 EP3609944A1 EP18718900.6A EP18718900A EP3609944A1 EP 3609944 A1 EP3609944 A1 EP 3609944A1 EP 18718900 A EP18718900 A EP 18718900A EP 3609944 A1 EP3609944 A1 EP 3609944A1
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- European Patent Office
- Prior art keywords
- compound
- group
- carrying
- formula
- reactive
- Prior art date
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Classifications
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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
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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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
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
-
- 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
- C08G18/2805—Compounds having only one group containing active hydrogen
- C08G18/2815—Monohydroxy compounds
- C08G18/282—Alkanols, cycloalkanols or arylalkanols including terpenealcohols
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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
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/2805—Compounds having only one group containing active hydrogen
- C08G18/285—Nitrogen containing compounds
- C08G18/2875—Monohydroxy compounds containing tertiary amino groups
-
- 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
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3218—Polyhydroxy compounds containing cyclic groups having at least one oxygen atom in the ring
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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
- C08G18/28—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
- C08G18/3819—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen
- C08G18/3842—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring
- C08G18/3844—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring containing one nitrogen atom in the ring
- C08G18/3846—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring containing one nitrogen atom in the ring containing imide groups
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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
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/7875—Nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring
- C08G18/7881—Nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring having one nitrogen atom in the ring
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/12—Polyurethanes from compounds containing nitrogen and active hydrogen, the nitrogen atom not being part of an isocyanate group
Definitions
- the present invention relates to a reactive organic product comprising one or more multifunctional organic compounds of formula (I), and its use as a cleavable crosslinking agent in a two-component reactive composition.
- the invention also relates to crosslinkable compositions, and more particularly to coating compositions, comprising such a reactive organic product.
- the invention relates to the use of these coatings as self-healing coatings, as well as to a self-healing process.
- the self-healing materials are able to undergo, at the molecular level as well as at the macroscopic scale, a phenomenon of chemical or physical repair in response to an external stimulus, without it is necessary to involve an outside operator.
- the micro-encapsulation of healing agents which consists in enclosing in the material microcapsules or microfibers containing a healing agent, capable of breaking at the same time as the material.
- the healing agent present in the material is thus spread in the cracks of the material which it fills by polymerization, for example under the action of a catalyst dispersed in the matrix.
- the method of reversible covalent bonds consists in incorporating in the structure of macromolecules covalent bonds capable of breaking and reforming "on command", by simple displacement of the thermodynamic equilibrium. It is possible to control this balance by an external stimulus, such as temperature, pH, humidity, etc.
- This method has the advantage of allowing several self-scarring at the same point of the material, while being easily controllable.
- the reversible covalent bonds can easily integrate into a pre-existing material: it suffices for them to be incorporated in a crosslinking agent, which requires little variations in formulation and reconciles the self-healing properties sought with the usual mechanical properties of the materials in which they are integrated.
- the inventors have today developed a new self-healing reagent organic product comprising a reversible covalent bond capable, under the effect of external stimulation and without the addition of additional chemical species, of repairing cracks, and thus of increase the life of the coatings.
- This new self-healing product is a reversibly cleavable crosslinking agent capable of replacing conventional crosslinking agents.
- the crosslinking agent of the invention carries isocyanate functional groups, and may advantageously be used in coatings based on polyol resins. Once the crosslinking has been carried out, the branches formed by the crosslinking agent are capable of breaking and reforming in a reversible manner on command, without modifying the urethane functions obtained in place of the alcohol functions.
- the crosslinking agent of the invention is formed and cleaved in the final coating by reaction of Diels-Alder and retro-Diels-Alder.
- This reaction which won Otto Diels and Kurt Aider's Nobel Prize in Chemistry in 1950, is a cycloaddition reaction in which a conjugated diene reacts on a so-called "dienophile” alkene to form a six-atom unsaturated ring.
- the reaction of furan (cis-blocked diene) on maleic anhydride (dienophile bearing highly electron-withdrawing groups) is known to give a high yield, and to be easily reversible by heating:
- the synthesis strategy of the crosslinking agent of the invention may, for example, use a diisocyanate and a hydroxylated furan derivative, the resulting diene then reacting by reaction of Diels-Alder with a mono-maleimide carrying a hydroxyl group. having previously reacted with an isocyanate function to form a urethane bond.
- the resulting Diels-Alder adduct is likely to cleave by retro-Diels-Alder in response to an external stimulus.
- Scheme 2 Synthesis of a cleavable crosslinking agent according to the invention by separate synthesis of two semi-adducts, then Diels-Alder reaction between the two semi-adducts
- the synthesis strategy of the crosslinking agent of the invention may use a mono-maleimide carrying a hydroxy group and a furan derivative, and provides a Diels-Alder adduct bearing hydroxyl groups capable of cleaving in response to an external stimulus. This adduct is reacted with diisocyanates to obtain a crosslinking agent terminated on each side by an isocyanate function, cleavable by retro-Diels-Alder.
- the final self-healing coating comprising the crosslinking agent of the invention has the advantage of being activated and deactivated several times, without deteriorating over time. It also shows quite satisfactory mechanical properties.
- the subject of the invention is a reactive organic product comprising one or more multifunctional organic compounds corresponding to the following formula (I):
- RI is chosen from aliphatic groups at Q-Qo, preferably at C 1 -C 35 , aromatic groups at C 6 -C 2 o, preferably C 6 -C 13 , or the alkylaryl groups in which the aryl group (s) are C 6 -C 2 o and the alkyl chain (s) are in CrQo, RI possibly comprising an ester function, and RI being a carrier of a terminal hydroxy group reacted with an isocyanate function to form a urethane bond, and RI being advantageously a linear or branched C 1 -C 6 aliphatic group optionally comprising a saturated or unsaturated C 5 -C 6 cycloaliphatic group and preferably comprising an unsaturated C 6 cycl
- DA is a Diels-Alder adduct between a diene compound D carrying a chain R2 and a dienophile compound A carrying an RI group, the diene functions of the diene compound D being chemically blocked by reaction of Diels-Alder with the compound dienophile A,
- R2 is an alkyl chain Q-C4 alkyl, preferably Ci-C 2, bearing at least one hydroxyl group reacted with an isocyanate functional group to form a urethane bond
- ⁇ R 3 is selected from aliphatic C 5 -C 20 aromatic groups or C 6 -C 2
- R3 is a cycloaliphatic C 6 optionally substituted by one or more linear or branched alkyl chains QC 6 .
- Aliphatic group a linear or branched, saturated or unsaturated, linear or branched C 10 -C 20 acyclic or cyclic hydrocarbon group, with the exception of aromatic groups, preferably C 1 -C 35 .
- branched means that at least one lower alkyl group such as methyl or ethyl is carried by a linear aliphatic chain.
- Alkyl group a linear or branched, preferably C 1 -C 35 , saturated Q-Qo hydrocarbon aliphatic group.
- branched means that at least one lower alkyl group such as methyl or ethyl is carried by a linear alkyl chain.
- Alkene group an unsaturated hydrocarbon-based aliphatic group comprising a covalent double bond between two carbon atoms, linear or branched, C 2 -C 20 , preferably C 2 -C 12 , and even more preferably Q-Ce.
- branched means that at least one lower alkyl group such as methyl or ethyl is carried by a linear alkenyl chain.
- Cycloalkyl means any functional group or substituent derived from a non-aromatic ring having at least three carbon atoms, and preferably C 3 -C 2, optionally containing one or more heteroatoms selected from S, 0 and N.
- groups mention may be made especially of cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl; the optionally substituted cyclohexyl group being preferred.
- Aromatic group any functional group or substituent derived from at least one aromatic ring; an aromatic ring corresponds to any planar mono- or polycyclic group comprising a delocalized ⁇ system in which each atom of the cycle comprises an orbital p, said orbital p overlapping each other; among such aromatic groups, there may be mentioned phenyl, biphenyl, naphthalene and anthracene groups.
- the aromatic groups of the invention are C 6 -C 20 , and preferably C 6 -C 3 .
- Alkoxylated chain any chain, linear or branched, comprising at least one polyether chain.
- Said polyether chain may comprise from 1 to 40, preferably from 1 to 20, and even more preferably from 1 to 15 alkoxylated units (or oxyalkylenated), such as ethoxy, propoxy, butoxy units, and preferably a mixture of ethoxy and propoxy units.
- the diene compound D is a cyclic diene, preferably C 5 -C 6 , and even more preferably a C 5 -C 6 cyclic diene comprising a heteroatom, said diene compound D carrying an alkyl chain R 2, C 1 -C 4, preferably C 1 -C 2, -C 2 , bearing at least one hydroxyl group.
- the diene compound D preferably corresponds to the following formula:
- Ra, Rb, Rc and Rd are chosen from H or the alkyl chains at d-Ci 2 , at least one of the radicals Ra or Rd being an alkyl chain R2 in Ci-Q, preferably in CrC 2 , bearing at least one hydroxy group.
- the diene compound D carrying an alkyl chain R 2 C 1 -C 4, preferably Ci-C 2, bearing at least one hydroxyl group is furfuryl alcohol of the formula:
- the dienophile compound is dienophile compound
- A is an alkene, preferably an optionally substituted C 4 -C 8 cyclic alkene, bearing a RI group carrying a hydroxy terminal group capable of reacting with an isocyanate function to form a urethane bond, and comprising at least one imide group; .
- Said imide group may be an ⁇ , ⁇ -ethylenically unsaturated imide, preferably chosen from the maleimide, tetrahydrophthalimide and imide derivative groups of the anhydride or itaconic acid.
- the dienophile compound A is a mono-maleimide compound corresponding to the following formula:
- R 1 is a linear or branched C 1 -C 6 aliphatic group, optionally comprising a saturated or unsaturated C 5 -C 6 cycloaliphatic group, and preferably comprising an unsaturated C 6 cycloaliphatic group, or R 1 is a C 20 aromatic group; or RI is an alkylaryl group in which the aryl group (s) are C 6 -C 2 O and the alkyl chain (s) are in CrQo, RI optionally carrying an ester function, and RI carrying a terminal hydroxy group,
- Re and Rf are chosen from H, the linear or branched alkyl chains Ci-Ci 2 , or Re and Rf are bonded together to form a C 6 aliphatic ring.
- the dienophile compound A is a mono-maleimide compound corresponding to the following formula:
- - RI is an alkoxylated chain Ci-Qo / preferably comprising 1 to 20 alkoxy units, and still LEMENT more preferably 1 to 15 alkoxy units, such as ethoxy units, propoxy, butoxy, or a mixture of ethoxy and propoxy units, or RI is an alkoxyaryl group in which the aryl group (s) are C 6 -C 20 and the or the alkoxylated chains are Ci-Qo, preferably comprising 1 to 20 alkoxylated units, and even more preferably 1 to 15 alkoxylated units, such as ethoxy, propoxy, butoxy units, or a mixture of ethoxy and propoxy units, - Re and Rf, which are identical or different, are chosen from H or CH 3 .
- the molecular weight of the mono-maleimide of the invention advantageously varies between 500 and 1000 g. mol "1 , still more preferably between 700 and 800 g mol -1 .
- IPDI isophorone diisocyanate
- the retro-Diels-Alder cleavage of the organic reactive product of the invention can be achieved by increasing the temperature, and is attainable from 60 ° C.
- the cleavage may optionally require temperatures up to 140 ° C. depending on the stereochemistry of the Diels-Alder adducts obtained: it is indeed easier to cleave the endo adduct than the exo adduct.
- the conditions for preparing the reactive organic product of the invention are preferably adjusted to promote the production of the endo stereochemical form.
- the reactive organic product comprising one or more multifunctional organic compounds of formula (I) according to the invention may be characterized by its index I NC0 , which is advantageously between 75 and 95 mgKOH.g -1 .
- the index ⁇ ⁇ ⁇ can be determined by back-titration with n-dibutylamine in excess.
- Another object of the invention is a first process for preparing a reactive organic product comprising one or more multifunctional organic compounds of formula (I) according to the invention comprising the following steps:
- Steps (i), (ii) and (iii) are preferably carried out at a temperature between 20 and 40 ° C to promote the production of the endo stereochemical form. They are also preferably carried out under an inert atmosphere, for example under nitrogen, and optionally in the presence of a desiccant such as tosyl isocyanate, to avoid the presence of water and avoid side reactions involving the isocyanate functions.
- a desiccant such as tosyl isocyanate
- the steps (i), (ii) and (iii) may also be carried out in a polar solvent, in particular chosen from acetic acid esters such as ethyl acetate. and butyl acetate, or ketones such as acetone, butan-2-one, heptan-2-one, methyl isobutyl ketone and cyclohexanone.
- a polar solvent in particular chosen from acetic acid esters such as ethyl acetate. and butyl acetate, or ketones such as acetone, butan-2-one, heptan-2-one, methyl isobutyl ketone and cyclohexanone.
- the reactive organic product comprising one or more multifunctional organic compounds of formula (I) of the invention may also be prepared according to a second process comprising the following steps:
- DA-R 1 -OH greater than 1, preferably ranging from 2.10 to 2.40, and still more preferably from 2.10 to 2.20, to obtain a reactive organic product comprising one or more multifunctional organic compounds of formula ( I) according to the invention
- the steps (i ') and ( ⁇ ') are preferably carried out at a temperature between 20 and 40 ° C, to promote the production of the endo stereochemical form. They are also preferably carried out under an inert atmosphere, for example under nitrogen, and optionally in the presence of a desiccant such as tosyl isocyanate, to avoid the presence of water and to avoid side reactions involving the isocyanate functions.
- a desiccant such as tosyl isocyanate
- the steps and (W) can be carried out in a polar solvent, in particular chosen from acetic acid esters such as ethyl acetate and acetate. butyl, or ketones such as acetone, butan-2-one, heptan-2-one, methyl isobutyl ketone and cyclohexanone.
- a polar solvent in particular chosen from acetic acid esters such as ethyl acetate and acetate. butyl, or ketones such as acetone, butan-2-one, heptan-2-one, methyl isobutyl ketone and cyclohexanone.
- the diene compound D bearing a C 1 -C 4 , preferably C 1 -C 2 , alkyl chain R2, bearing at least one hydroxyl group used during steps (i) and (0) of the processes of the invention is advantageously furfuryl alcohol.
- the dienophile compound of formula A bearing a group RI, itself bearing a terminal hydroxy group, used during steps (ii) and (i ') of the processes of the invention is advantageously a mono compound.
- maleimide corresponding to the following formula:
- R1, Re and Rf are as defined above.
- the asymmetric aliphatic diisocyanate is isophorone diisocyanate (IPDI).
- Step ( ⁇ ') of the second process of the invention can be carried out in the presence of a catalyst which influences the reactivity of the diisocyanate, and makes it possible to increase the reactivity of the secondary isocyanate function, when said step is carried out at a temperature between 20 and 40 ° C.
- Said catalyst is preferably based on tin, bismuth, titanium, zinc, or zirconium.
- the catalyst is based on tin: it is an organotin compound, and more particularly dibutyltin dilaurate (DBSnDL).
- the catalyst may be added at a molar level ranging from 0.1 to 1 mol%, and preferably from 0.2 to 0.5 mol%, relative to the total mol% of diisocyanate.
- step ( ⁇ ') of the process of the invention may be carried out at a higher temperature, preferably between 60 and 80 ° C, in the absence of catalyst.
- the present invention also relates to the use of an organic reagent product according to the invention, or obtained by a process according to the invention, as a cleavable crosslinking agent in a two-component reactive composition, preferably in a two-component reactive composition.
- a cleavable crosslinking agent in a two-component reactive composition, preferably in a two-component reactive composition.
- crosslinkable and even more preferably an acrylic resin functionalized with hydroxy groups.
- the reactive organic product of the invention is a crosslinkable agent heat-cleavable reversibly in a two-component reactive composition.
- Another subject of the invention relates to a crosslinkable composition
- a crosslinkable composition comprising an organic reagent product according to the invention, or obtained by a process according to the invention, and a component comprising at least one reactive functional group capable of reacting with said reactive organic product such as an acrylic resin functionalized with hydroxy groups.
- the crosslinkable composition of the invention is preferably a coating composition selected from paints, varnishes, inks and adhesives, a molding composition, a composite composition, or a sealant composition.
- the invention also relates to the use of a crosslinkable composition according to the invention for the self-healing of the surface of coatings or articles based on such a composition, or for the recycling of thermoplastic or thermosetting polymers, in particular composite moldings.
- a last object of the invention is a self-healing process comprising a step of applying a crosslinkable composition according to the invention to a substrate, followed by a step of de-protection (cleavage) by retro -Diels-Alder dienes functions chemically blocked from the crosslinking agent contained in said composition, under the effect of an external energy, and especially by conduction, convection, or radiation.
- the step of deprotecting back-Diels-Alder is preferably a thermo-cleavage step performed by heating at a temperature ranging from 60 to 120 ° C, and preferably from 70 to 100 ° C. This heating step can be carried out for a period ranging from 5 minutes to 2 hours, and preferably between 15 minutes and 1 hour.
- the self-healing process of the invention may further comprise, after the step of deprotection by retro-Diels-Aider, a step of healing by cooling, preferably at a temperature ranging from 20 to 30 ° C. and even more preferably at room temperature (25 ° C).
- the invention also comprises other arrangements which will become apparent from the additional description which follows, which relates to examples of synthesis of reactive organic products comprising one or more multifunctional organic compounds of formula (I) according to US Pat. 'invention.
- the 3 rd step is the reaction between the two semi-adducts obtained at the end of the st stage and the 2 nd step.
- This step is carried out in a batch of a capacity of 2L, inerted with nitrogen and provided with a circulating agitation module (marine propeller) agitated at 100 revolutions. min -1 at room temperature (25 ° C.) The medium is allowed to react with stirring for 7 days.
- a circulating agitation module marine propeller
- the index I NC0 of the crosslinking agent 1 obtained at the end of this process is determined by back-titration with excess n-dibutylamine. According to this method, the crosslinking agent 1 has an index I NC o of 86.5 mgKOH.g -1 .
- DBSnDL dibutyltin dilaurate
- the index I NC o of the crosslinking agent 2 obtained at the end of this process is determined by back-titration with excess n-dibutylamine. According to this method, the crosslinking agent 2 has an index I NC o of 84 mgKOH.g -1
- Example 3 Formulation and evaluation of self-healing coatings comprising a crosslinking agent according to the invention
- crosslinking agent 1 synthesized in Example 1 The properties of the crosslinking agent 1 synthesized in Example 1 are evaluated in a polyol resin, e. Synocure® 854 BA 80 marketed by the company Arkema. It is a resin highly functionalized with hydroxyl groups, crosslinkable at room temperature by addition of a prepolymer carrying isocyanate groups.
- Synocure® 854 BA 80 marketed by the company Arkema. It is a resin highly functionalized with hydroxyl groups, crosslinkable at room temperature by addition of a prepolymer carrying isocyanate groups.
- the formulations are made in stoichiometric quantities, that is to say preferably by ensuring that there is the same number of hydroxyl functions from the resin as isocyanate functions from the crosslinking agent:
- the formulation of the invention is then applied to a steel plate type QD 36 (Q-panel).
- the application of the formulation is made by means of an apparatus for passing a metal bar at a height of 100 ⁇ m above the surface of the plate, which allows to spread there homogeneously a viscous liquid of 100 pm thick wet. Streaks are made on the surface of the metal plate with a comb whose blades are 1 mm apart.
- the self-healing properties are evaluated hot by placing the metal plate prepared and having the streaks, in an oven at 90 ° C for 20 minutes.
- the self-healing coating of the invention is compared to a conventional coating, a control formulation using the same resin (Synocure® 854 BA 80) and a non-cleavable crosslinkable agent, Le. Tolonate TM HDT-LV2 sold by Vencorex Chemicals.
- the thickness of the applied reference formulation is also 100 ⁇ m wet thickness to have the same dry thickness as before, ie 40 ⁇ m ⁇ 6 ⁇ m. Striations are made on the reference plate in the same manner as for the plates of the invention, by streaking the surface of the plate with a comb whose blades are spaced 1 mm apart.
- Photographs of the plates are made before and after heating, and are shown in Figure 1 (photograph from the top: before baking - photograph of the bottom lb: after steaming).
- the plates made with the crosslinking agent 1 of the invention are compared to the reference plate (T) comprising the Tolonate TM HDT-LV2.
- T the reference plate comprising the Tolonate TM HDT-LV2.
- a second self-healing test is performed on the same plates that have already undergone the first self-healing test: new striae are made, and the plates are submitted. a second oven pass of 20 minutes at a temperature of 90 ° C.
- Photographs of the plates are made before and after heating, and are shown in Figure 2 (top 2a photographs: before baking - bottom 2b photographs: after steaming).
- the coating of the invention still has self-healing properties and several successive hot scars seem possible, which is not the case of the reference coating.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Polyurethanes Or Polyureas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1753266A FR3065220B1 (fr) | 2017-04-13 | 2017-04-13 | Produit organique reactif et son utilisation comme agent reticulant dans des revetements auto-cicatrisants |
| PCT/FR2018/050861 WO2018189461A1 (fr) | 2017-04-13 | 2018-04-06 | Produit organique réactif et son utilisation comme agent réticulant dans des revêtements auto-cicatrisants |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3609944A1 true EP3609944A1 (fr) | 2020-02-19 |
Family
ID=59031196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18718900.6A Withdrawn EP3609944A1 (fr) | 2017-04-13 | 2018-04-06 | Produit organique réactif et son utilisation comme agent réticulant dans des revêtements auto-cicatrisants |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3609944A1 (fr) |
| FR (1) | FR3065220B1 (fr) |
| WO (1) | WO2018189461A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110066381B (zh) * | 2019-04-28 | 2021-03-26 | 上海应用技术大学 | 含有da键和动态锌离子交联的自愈合聚氨酯的制备方法 |
| CN110606931A (zh) * | 2019-09-09 | 2019-12-24 | 南昌航空大学 | 一种水性光固化自修复聚氨酯树脂的制备方法 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6403753B1 (en) * | 2000-01-18 | 2002-06-11 | Sandia Corporation | Method of making thermally removable polyurethanes |
| WO2015119688A2 (fr) * | 2013-11-18 | 2015-08-13 | University Of Florida Research Foundation, Inc. | Polymères auto-cicatrisants à mémoire de forme (smshp) |
-
2017
- 2017-04-13 FR FR1753266A patent/FR3065220B1/fr active Active
-
2018
- 2018-04-06 WO PCT/FR2018/050861 patent/WO2018189461A1/fr not_active Ceased
- 2018-04-06 EP EP18718900.6A patent/EP3609944A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018189461A1 (fr) | 2018-10-18 |
| FR3065220B1 (fr) | 2020-05-22 |
| FR3065220A1 (fr) | 2018-10-19 |
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