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US 2021/0198418 A1Published application
Multi-component epoxy resin compound with leakage indicator, and curing component for the epoxy resin compound
AssigneeHilti Aktiengesellschaft
InventorAlexander Bornschlegl
Life of this patent
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Abstract
A curing composition is useful for a multi-component epoxy resin compound and includes at least one first poly amine, at least one second polyamine, and at least one polyphenol from the group of bisphenols and novolac resins as an accelerator. Upon contact with atmospheric oxygen, the curing composition discolors within a few days and therefore leakages can be visually identified.
Claims15
1:
- A curing composition for a multi-component epoxy resin compound, comprising:
- at least one first polyamine,
- at least one second polyamine, and
- at least one polyphenol selected from the group consisting of bisphenols and novolac resins as an accelerator,
- wherein the at least one first polyamine corresponds to the following general formula (I):
- in which
- R1 and R2 denote, independently of one another, —H or —CH3, or together denote an optionally substituted C3 to C8 hydrocarbon chain which is connected to form a cycle, and
- R3 denotes —H, —CH3, —CH2—CH2—NH2 or —CH2—CH2—NH—CH2—CH2—NH2, and
- wherein the at least one second polyamine corresponds to the following general formula (II) or (III):
- in which
- R1 and R2 denote, independently of one another, H or —CH3, and
- X denotes NH, O or S.
9 more elements
2:
- The curing composition according to claim 1, wherein the at least one first polyamine is selected from the group consisting of 1,2-diaminocyclohexane, 1,2-diaminocyclohexene, diethylenetriamine, triethylenetetramine, and mixtures thereof.
3:
- The curing composition according to claim 1, wherein the at least one second polyamine is selected from the group consisting of 1,3-bis(aminomethyl)cyclohexane, aminoethylpiperazine, and mixtures thereof.
4:
- The curing composition according to claim 1, wherein the at least one first poly amine is present in a proportion of from 1 to 50 wt. %, based on the weight of organic parts of the curing composition.
5:
- The curing composition according to claim 1, wherein the at least one second polyamine is present in a proportion of from 1 to 50 wt. %, based on the weight of organic parts of the curing composition.
6:
- The curing composition according to claim 1, wherein the at least one polyphenol is present in a proportion of from 1 to 40 wt. %, based on the weight of organic parts of the curing composition.
7:
- The curing composition according to claim 1, wherein the at least one polyphenol comprises a novolac resin which corresponds to the following formula (IV):
- in which
- R1 and R2 each denotes, independently of one another, H or —CH3;
- R3, R4, R5 and R6 each denotes, independently of one another, H, —CH3 or an aliphatic functional group;
- and
- n is 0 to 20.
3 more elements
8:
- The curing composition according to claim 1, wherein the at least one polyphenol comprises a novolac resin which corresponds to the following formula (V):
- m which
- R1 denotes H,
- R2 denotes C1 to C10 alkyl,
- m is 0, 1 or 2, and
- n is 0 to 20.
3 more elements
9:
- The curing composition according to claim 1, wherein the at least one polyphenol comprises a bisphenol from the group consisting of bisphenol A, bisphenol F, and mixtures thereof.
10:
- The curing composition according to claim 1, wherein the curing composition further comprises;
- additional monoamines and/or polyamines, and/or
- a curing agent for epoxy resins selected from the group consisting of Mannich bases, polyamidoamines, phenalkamines, and mixtures thereof.
11:
- The curing composition according to claim 1, wherein the curing composition further comprises;
- an additive selected from the group consisting of diluents, sol vents, accelerants, silanes, thickeners, inorganic fillers, and mixtures thereof.
12:
- A multi-component epoxy resin compound comprising:
- an epoxy resin component (A) containing at least one curable epoxy resin and optionally a reactive diluent,
- at least one curing component (B) comprising the curing composition according to claim 1,
- wherein the epoxy resin component and the at least one curing component axe separate from one another.
1 more element
13:
- The multi-component epoxy resin compound according to claim 12, further comprising:
- an additive selected from the group consisting of co-accelerants, adhesion promoters, reactive diluents, thickeners, fillers, and mixtures thereof.
14:
- A method for detecting leaks, comprising:
- detecting discoloration of a mixture of a polyphenol and a first and a second poly amine in the curing composition according to claim 1,
- wherein the curing composition visibly discolors within 10 days upon contact with atmospheric oxygen.
15:
- The curing composition according to claim 4, wherein the at least one first polyamine is present in a proportion of from 5 to 20 wt. %, based on the weight of the organic parts of the curing composition.