Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• • 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
  • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
  • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
  • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
  • C08G59/66—Mercaptans
• • 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
  • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
  • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
  • C08G59/68—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the catalysts used
  • C08G59/681—Metal alcoholates, phenolates or carboxylates
  • C08G59/685—Carboxylates
• • 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
  • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins

Definitions

• the invention relates to epoxy resin hardener compositions containing at least one mercaptan hardener and at least one metal salt of carboxylic acids with 8-24 carbon atoms.
• the film formers are among the most important raw materials for lacquers, often also known as binders. These are mostly polymers or prepolymers of an organic chemical nature, the prepolymers (oligomers) being polymerized by so-called lacquer curing. Film formers have the function of forming a coherent paint or color film that adheres to the respective surface and - if present - hold together or embed the other non-volatile paint components, in particular pigments and fillers. Film formers therefore represent the basis of a coating material. According to their origin, the film formers are divided into natural substances, modified natural substances and synthetic substances. The latter include in particular polyesters, alkyd resins, acrylic resins, plastic dispersions (emulsion polymers), formaldehyde condensates, polyurethanes and epoxy systems.
• the oxidative drying oils are of particular importance. These are fatty oils, ie triglycerides of fatty acids, the number of Double bonds in these oils are the most important feature.
• the so-called "drying" of these oils is of outstanding importance, which means the oxidative polymerization by crosslinking. Since the drying process is very slow, it is accelerated by the addition of so-called siccatives (drying agents), which are soaps, ie cobalt, manganese, zirconium and cerium salts of carboxylic acids.
• siccatives drying agents
• the cross-linking of drying oils by means of siccatives to a so-called varnish is, however, something completely different from the cross-linking of epoxy resins described below.
• Epoxy resins are organic chemical substances or mixtures of substances which generally have two or more - mostly isolated, generally terminal - epoxy groups per molecule and which can be crosslinked to form thermosetting molded materials by reaction of these epoxy groups.
• epoxy resins or epoxy resins are organic chemical substances or mixtures of substances which generally have two or more - mostly isolated, generally terminal - epoxy groups per molecule and which can be crosslinked to form thermosetting molded materials by reaction of these epoxy groups.
• epoxy resins are organic chemical substances or mixtures of substances which generally have two or more - mostly isolated, generally terminal - epoxy groups per molecule and which can be crosslinked to form thermosetting molded materials by reaction of these epoxy groups.
• epoxy resins or epoxy resins are organic chemical substances or mixtures of substances which generally have two or more - mostly isolated, generally terminal - epoxy groups per molecule and which can be crosslinked to form thermosetting molded materials by reaction of these epoxy groups.
• reaction resins which are liquid or meltable resins which, with themselves or with reaction partners (hardeners), undergo a crosslinked state through polyaddition or polymerization. Accordingly, epoxy resins are reactive resins with a sufficient number of epoxy groups for curing.
• Reaction resin compounds are processable mixtures of a reaction resin with the necessary additives, such as hardeners, catalysts, fillers.
• Reactive resin molding materials are substances (materials) made from hardened reactive resin compounds that are available as molded parts or semi-finished products. The following scheme therefore applies:
• a particularly important class of reactive resin molding materials are coatings and adhesives based on epoxy resins.
• Epoxy resins have a very low molecular weight compared to other high molecular weight polymers and are in some cases even defined low molecular weight compounds. Their most important chemical reaction for use as plastic materials is therefore crosslinking, which is generally triggered by the addition of a second component, the so-called hardener. In principle, the oxirane ring is opened and the free valences are often linked to other functional groups present in the epoxy resin by incorporating the hardener. The crosslinking takes place as a polyaddition or polymerization without the elimination of solid, liquid or gaseous substances, so that any bubbles are avoided even without applying pressure and only very slight shrinkage occurs. A large number of substances are known as hardeners from the prior art. The most important include organic di- and polycarboxylic acid anhydrides, reactive di- and polyamines and amides as well as mercaptans.
• the object of the invention was to provide hardener compositions for epoxy resins.
• epoxy resin hardener compositions for epoxy resins.
• epoxy resin hardener compositions containing at least one mercaptan hardener and at least one metal salt of carboxylic acids with 8-24 C atoms lead to molding compositions in the crosslinking reaction with epoxy resins, in particular coatings - which are distinguished by excellent performance properties and in particular one have excellent gloss.
• the invention initially relates to epoxy resin hardener compositions comprising at least one mercaptan hardener and at least one metal salt of carboxylic acids having 8-24 carbon atoms.
• Hardeners for epoxy resins also known as "epoxy curing agents" - are known to the person skilled in the art.
• the following monograph is an example: Handbook of Coating Additives, Vol. 2; Leonard J. Calbo (editor), New York 1992; Pages 277-299.
• page 298 refers to polymercaptans which are counted among the "mercaptan hardeners" in the context of the present invention.
• the term “mercaptan hardener” encompasses all organic compounds with one or more mercapto groups which are suitable for curing epoxy resins.
• the composition additionally contains at least one amide resin hardener and / or at least one amine resin hardener.
• Amide resin hardeners and amine resin hardeners are known to the person skilled in the art. The following literature is only an example of this special hardener:
• compositions according to the invention contain, in addition to the mercaptan hardener, at least one metal salt of carboxylic acids having 8-24 carbon atoms.
• these are Ba, Cd, Ca, Ce, Cu, Fe, La, Pb, Mn, Zn and Zr salts of carboxylic acids with 8-24 carbon atoms.
• carboxylic acids examples include caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, stearic acid, nonadecanoic acid, arachic acid, heneicosanoic acid, behenic acid, 10-undecenoic acid, lauroleic acid,
• the carboxylic acids can be present individually or as mixtures.
• the zinc ricinoleate can be used in pure form or in technical quality. If it is of technical quality, in addition to the zinc salt of 9-cis-octadecen-12-oleic acid, it can also contain zinc salts of other hydroxy fatty acids and other saturated and / or unsaturated fatty acids, furthermore zinc salts of abietic acid or similar resin acids and derivatives of tocopherols or Ascorbic acid.
• the mixtures according to the invention contain the metal salts of carboxylic acids with 8-24 C atoms, in particular in an amount which corresponds to 0.01 to 5.0% by weight, based on the mercaptan hardener. A range from 0.5 to 3% by weight is particularly preferred.
• the epoxy resin hardener compositions according to the invention are used
• epoxy resins are polyepoxides with an average of at least two epoxy groups per molecule.
• These epoxy compounds can be both saturated and unsaturated and aliphatic, cycloaliphatic, aromatic or heterocyclic and can also have hydroxyl groups. You can also contain those substituents that are among the mixture and
• Reaction conditions do not cause any troublesome side reactions, for example alkyl or aryl substituents, ether groups and the like.
• epoxy compounds are preferably
• Novolaks reaction products of single or multi-weight phenols with
• Aldehydes especially formaldehyde in the presence of acidic catalysts.
• Epoxy equivalent weights of these epoxy compounds are preferably between 160 and 3000, in particular between 170 and 1000.
• Epoxy equivalent weight of a substance is the amount of
• Substance in grams defined that contains 1 mol of oxirane rings.
• the following compounds are preferably suitable as polyhydric phenols: resorcinol, hydroquinone, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), mixtures of isomers of dihydroxydiphenylmethane (bisphenol F), tetrabromobisphenol A, 4,4'-dihydroxy-diphenylcyclohexane , 4,4'-dihydroxy-3,3-dimethyldiphenylpropane, 4,4'-dihydroxydiphenyl, 4,4'-dihydroxy-benzophenol, bis- (4-hydroxyphenyl) -1,1-ethane, bis- (4-hydroxyphenyl ) - 1, 1-isobutane, bis (4-hydroxyphenyl) methane, bis (4-hydroxyphenyl) ether, bis (4-hydroxyphenyl) sulfone and others, as well as the chlorination and bromination products of the aforementioned compounds ; Bisphenol A is particularly preferred. CH 3
• Polyglycidyl ethers of polyhydric alcohols are also suitable as epoxy resins.
• Polyglycidyl ethers of polycarboxylic acids can also be used as epoxy resins, which are obtained by reacting epichlorohydrin or similar epoxy compounds with an aliphatic, cycloaliphatic or aromatic polycarboxylic acid, such as oxalic acid, succinic acid, adipic acid, glutaric acid, phthalic acid, terephthalic acid, hexahydrophthalic acid, and dimerized linolenic acid.
• an aliphatic, cycloaliphatic or aromatic polycarboxylic acid such as oxalic acid, succinic acid, adipic acid, glutaric acid, phthalic acid, terephthalic acid, hexahydrophthalic acid, and dimerized linolenic acid.
• Examples are diglycidyl adipate, diglycidyl phthalate and
• the invention further relates to a process for producing high-gloss epoxy resin coatings, in which case component A, which contains at least one epoxy resin, is brought into contact with at least one mercaptan hardener and at least one metal salt of carboxylic acids having 8-24 carbon atoms, if desired with other additives, the mixture is homogenized to a reaction resin mass and allowed to cross-link harden.
• the epoxy resins of component A come into contact with mercaptan hardener and carboxylic acids with 8-24 carbon atoms.
• This can be done in a simple manner by first producing a component B which contains a mixture of mercaptan hardener and metal salts of carboxylic acids and then bringing this component B into contact with component A.
• the epoxy resins are additionally cured in the presence of amine and / or amide hardness.
• these special hardeners reference is made to the above explanations regarding the amide resin hardener and amine resin hardener.
• the temperature in the process according to the invention is not critical per se, but the curing is preferably carried out in the temperature range from -10 to 200 ° C. and in particular from 5 to 50 ° C.
• the mercaptan hardeners and the carboxylic acid salts are used in relatively small amounts with regard to the epoxy resins of component A.
• the mixing ratios in the reaction resin composition are preferably adjusted so that the sum of the mercaptan hardness and metal salts of carboxylic acids also 8 - 24 carbon atoms is 0.5 to 200 wt .-% - based on the sum of the epoxy resins. A range from 1 to 25% by weight is particularly preferred.
• additives all additives known to those skilled in the art can be used. It is not critical whether the additives are made up with the epoxy resins and / or the mercaptan hardener and / or the carboxylic acid salts.
• Typical additives are solvents, pigments, fillers and also so-called additives such as defoamers, deaerators, wetting agents, dispersants, surface additives, matting agents, rheology additives, corrosion inhibitors, light stabilizers, drying agents, catalysts, biocides.
• Another object of the invention is the use of compositions containing at least one mercaptan hardener and at least one metal salt of carboxylic acids with 8-24 carbon atoms as hardeners for epoxy resins.
• compositions containing at least one mercaptan hardener and at least one metal salt of carboxylic acids with 8-24 carbon atoms as hardeners for epoxy resins.
• HK-1 Chemres E 50 X 75: commercially available epoxy resin (Henkel SpA / Italy)
• HK-2 Rilanit Special micro: hardened castor oil (Henkel KGaA /
• HK-3 Perenol F 40: leveling agent based on polyacrylate (Henkel KGaA /
• HK-4 Texaphor 963: pigment dispersant (Henkel KGaA / Germany)
• CK-1 Versamide 115 X 70: commercially available polyamide hardener (Henkel KGaA /
• CK-2 Capcure WR - 6: commercially available mercaptan hardener (Henkel Corporation /
• CK-3 Capcure 1.5 HV: commercial mercaptan hardener (Henkel Corporation /
• MIBK methyl isobutyl ketone
• Titanium dioxide commercial Ti0 2 of the rutile type (pigment) 2. Examples and comparative examples
• Air pressure syringes were applied in a layer thickness of 60 micrometers and allowed to cure at a temperature of 23 ° C. for a period of 7 days.
• Measuring angle of 60 ° determined as a dimensionless number.
• Table 1 clearly shows that the coating compositions according to the examples according to the invention were distinguished by significantly higher gloss levels than the coating compositions according to the comparative examples.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Epoxy Resins (AREA)
• Paints Or Removers (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

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• 1999
  • 1999-06-11 DE DE19926629A patent/DE19926629A1/de not_active Withdrawn
• 2000
  • 2000-06-02 CA CA2376457A patent/CA2376457C/en not_active Expired - Fee Related
  • 2000-06-02 ES ES00938730T patent/ES2246862T3/es not_active Expired - Lifetime
  • 2000-06-02 EP EP00938730A patent/EP1189966B1/de not_active Expired - Lifetime
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• 2003
  • 2003-01-08 US US10/338,443 patent/US6881813B2/en not_active Expired - Fee Related

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