CS220129B1 - Epoxy non-sagging putty - Google Patents

Abstract

Epoxy non-sag sealant curable with an amine hardener, containing epoxy resin 0' with a molecular weight of 350 to 800, inorganic pigments, thixotropic fillers and brighteners based on coumarin derivatives, preferably derivatives of 7-amino-4-methylcoumarin and 7-(triazol-2-yl)3-phenylcoumarin.

Description

The present invention relates to an amine hardenable epoxy binder which comprises epoxy resin, pigments, fillers, brighteners and optionally other additives from the group comprising plasticizers, wetting agents and flow agents. A suitable combination of these components provides a high degree of whiteness of the sealant. It is mainly used to repair certain enamel products, ceramic materials and for bonding and sealing porcelain products.

One of the outstanding applications of epoxy resins is cements. They are used to compensate for uneven surfaces of various products or to repair defects caused during! time of their use. The known and commonly used cements are based on epoxy resins, in particular palm palms having a molecular weight of 350 to 1000. They are modified with liquid glycidyl ethers such as phenylglycidylether, cresylglycidylether, butylglycidylether, poles of carboxylic aliphatic or aromatic acids such as dibutylmate. phosphoric acid esters such as triphenyl phosphate. These cements are particularly cured by aliphatic amines such as diethylenetriamine, triethylenetetramine, dipropylenetriamine and the like, and xylylenediamines, cycloaliphatic amines such as cyclohexylaminopropylamine. These amine systems cause a yellowish coloration, which is further increased by the long-term effect of light. Also, for many applications, the good flowability of the epoxy-hardener composition is a problem, thus preventing it from being applied to vertical surfaces due to the flow of the composition and the formation of curtains.

The foregoing disadvantages are overcome by the present invention. is an amine hardener curable epoxy sealant and comprising an epoxy resin, pigments, fillers, brighteners and optionally other additives from the group consisting of plasticizers, wetting agents and flow agents. The essence of the invention is that the sealant consists of 100 wt. parts of epoxy resin having a molecular weight of 350 to 800, 2 to 100 wt. parts of inorganic pigments, further from 1 to 15 wt. % of thixotropic fillers and from 0.01 to 5 wt. parts of a coumarin-based brightener, preferably 7-amino-4-methylquinarine derivatives or 7- (triazol-2-yl) -3-phenylcoumarin,

An advantage of the present invention is that the coumarin-based brightener, in particular 7-amino-4-methylcoumarin derivatives, in the presence of a nitrogenous hardener has a substantially higher brightening effect than when it acts alone. By a suitable combination with the filler, the material obtains thixotropic properties which allow it to be applied even to vertical surfaces without causing it to run down and create curtains. Also, its good castability remains unchanged and its application creates a smooth film with good gloss.

Used epoxy resins of molecular weight. 350 to 800 are of the Diana or Novolak type, or they can be mixtures thereof with epoxy compounds containing at least one epoxy group. These are, in particular, glycidyl ethers prepared by the reaction of epichlorohydrin, β-methylepichlorohydrin or glycerin-α, χ-chlorohydrin with phenols, such as resercine, hydroquinone and fluoroglucinems, or bisphenols, such as 2,2-bis- (4- * hydroxyphenyl J with propane, 2,2-bis- (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) sulfone and tris- or tetrakisphenols, ie the condensation products of phenols or its homologues with glyoxal; other dialdehydes. ^Do! this group also includes glycidyl ethers of phenolic novolak and further epoxy, hydantoin and its derivatives.

Reactive or non-reactive solvents may be used to reduce the viscosity of these products. Among the reactive solvents, those epoxy compounds which contain one epoxy group are used. These are, in particular, glycidyl ethers obtained by the reaction of epichlorohydrin or (3-methylepichloirhydrin with monofunctional phenols (e.g. phenol, cresol, xylenol), aliphatic alcohols or glycols (e.g. butylglycidylether, allylglycidylether, laurylglycidyl ether, butylene glycidyl ether). Further, nitrogenous substances such as diglycidylaniline and diglycidylcyclohexylamine may be used, and other reactive solvents may include unsaturated compounds such as styrene, methacrylate and the like. these are esters of aliphatic and aromatic polycarboxylic acids, such as adipates, phthalates, and inorganic acid tosters, such as phosphoric acid esters, and these non-reactive solvents are used as plasticizers for the compositions herein.

Silica is primarily used as a filler. By adding it, the composition obtains thixotropic properties which allow it to be applied directly to vertical surfaces without dripping and hinges, while maintaining good castability of the mass. After application, a smooth film with good gloss is produced.

Titanium and zinc white are used as pigments.

Among the amine hardeners, in particular diethylenetriamine, dipropylenetriamine, adducts of epoxy resin and aliphatic amines, aminoamides based on dimensioned fatty acids and aliphatic amines, diaminomethane, cyclohexylaminopropylamine, 3,3-dimethyl-4,4'-diaminocyclohexylmethane, Ν, Ν'Ν-amino , m-xylylenediamine, 4,4'-diaminodiphenylmethane, dicyandiamide,

20 5 triethylamine, benzyldimethylamine and others, or mixtures thereof.

The presence of an amine hardener greatly increases the brightener effect. Coumarin-based substances are used as brighteners, in particular 7-amino-4-methylcoumarin derivatives such as diethyl-7-amino-4-methylcoumarin and 7- (triazol-2-yl) -3-phenylcoumarin derivatives such as methyl -7- (triazol-2-yl) -3-phenylcoumarin.

The invention is further illustrated by the following non-limiting examples.

Example 1

100 wt. 30 parts by weight of an epoxy resin having a molecular weight of 380, prepared by the alkaline condensation of diane with epichlorohydrin, are mixed with 30% by weight of epoxy resin. parts of titanium white, with 10 wt. parts of colloidal silica and with 2 wt. parts of diethyl-7-amino-4-methylcoumarin. This mixture is cured with an aminoamide based on dimensioned fatty acids and diethylenetriamine and an amine number of 190 in a 1: 1 volume ratio. Creates a film of excellent whiteness, which has a very d-giant adhesion to metal substrates.

Example 2

100 wt. 10 parts by weight of epoxy resin having a molecular weight of 500, prepared by the alkaline condensation of diane with epichlorohydrin, are mixed with 10% by weight of epoxy resin. parts by weight of 2-ethylhexyl phthalate and 5 wt. parts of phenylglycidyl ether, further with 15 wt. parts of titanium white, 15 wt. parts of colloidal silica and 1 wt. portion of diethyl-7-aminomethylcoumarin. This mixture is cured with 8 wt. parts of diethylenetriamine. The composition is advantageous for repairing damaged surface of enamel baths.

Example 3

Epoxy non-sagging sealant according to the example

Claims (1)

An amine hardenable epoxy non-caking composition comprising an epoxy resin, pigments, fillers, brighteners, and optionally other additives from the group consisting of plasticizers, wetting agents and flow agents, characterized in that it consists of 100 wt. parts of epoxy resin of molecule29 1, except that it contains 30 wt. parts of zinc white. Example 4 100 wt. 10 parts by weight of epoxy resin having a molecular weight of 500, prepared by the alkaline condensation of diane with epichlorohydrin, are mixed with 10% by weight of epoxy resin. 2 parts by weight of 2-ethylhexyl acrylate; parts of zinc white and with 0.1 wt. % of 2-diethyl-7-amino-4-methylcoumarin. The mixture thus prepared is cured with 8 wt. parts of diethylenetriamine. Example 5 The epoxy non-slip sealant according to item 1, except that instead of the dian-type epoxy resin, it comprises a novolak epoxy resin having an epoxy content of 0.52 eq / g, further 15 wt. % of dibutyl phthalate and contains methyl-7- (triazol-2-yl) -3-phenylcoumarin as a brightener. The sealant is also advantageous for applications where the operating temperature is elevated, such as hot water tanks. Example 6 100 wt. parts of epoxy resin having a molecular weight of 800, prepared by the alkaline condensation of diane with epichlorohydrin, are heated to 120 ° C and mixed with 20 wt. parts of dibutyl maleate. Furthermore, the mixture contains 2 wt. parts of titanium white, 1 wt. 5 parts by weight of colloidal silica; parts of diethyl-7-amino-4-methylcoumarin. The reaction mixture thus prepared is cured with 9 wt. parts of dipropylene triamine. This sealant is particularly suitable for repairing baths with a slightly damaged surface. weight of 350 to 800, 2 to 100 wt. parts of inorganic pigments, 1 to 15 wt. % of thixotropic fillers and from 0.01 to 5 wt. parts of a brightener based on coumarin derivatives, preferably 7-amino-4-methylcoumarin or 7- (triazol-2-yl) -3-phenylcoumarin derivatives.