Abstract:
Provided are two-part shimming adhesives comprising a base part and a hardener part that are curable upon mixing. The base part includes a multifunctional epoxy resin having an epoxide functionality of at least three, a difunctional epoxy resin miscibly blended with the multifunctional epoxy resin. The hardener part includes a polyetheramine. Either the base part or hardener part further comprises an inorganic filler present in an amount from 10 percent to 60 percent, relative to the overall weight of the two-part curable shimming adhesive, and a phosphoric acid ester. The shimming adhesive enables joints to be assembled in one step, providing a significant advantage to the user.
Abstract:
The present disclosure provides a thermosettable structural adhesive composition comprising an epoxy compound; a thermoplastic compound; an epoxy curing agent; non-spherical particles. This composition can be useful for applications, for example, in the form of an adhesive film. Such applications can include bonding of parts (e.g., metal parts), especially those where bonding on an industrial scale is required. The structural adhesive composition may exhibit any one or more of advantageous adhesive strength, a certain resistance to corrosion, as well as a favourable cohesive failure mode.
Abstract:
The invention relates to the use of a structural adhesive film for bonding and sealing a hem flange connection between panels. The structural adhesive film comprises at least one adhesive layer and at least one layer with a porous structure. The adhesive layer comprise an epoxy compound as well as an epoxy curing agent.
Abstract:
The present disclosure is directed to a precursor composition for a curable adhesive, the precursor comprising: a) a part (A) comprising: i. a first epoxy curing agent comprising at least one polyether amine and having an amine equivalent weight of at least 45 grams per mole of amine equivalents; ii. a second epoxy curing agent distinct from the first epoxy curing agent or a secondary curative; iii. a metal nitrate catalyst; iv. optionally, a metal triflate catalyst; and b) a part (B) comprising: i. a multifunctional first epoxy resin having at least three functional groups; ii. a second epoxy resin distinct from the first epoxy resin; iii. a core-shell polymer toughening agent iv. a filler material; and v. optionally, an epoxy-based reactive diluent. The compositions of the present disclosure are particularly suitable for use in structural bonding applications, in particular for adhesively bonding parts in manufacturing operations in aeronautic and aerospace industries. The present disclosure also relates to method of using such epoxy resin based curable compositions.
Abstract:
In one embodiment, a method of bonding a substrate is described. The method comprises providing an epoxy resin composition comprising a first liquid part comprising an epoxy resin; and a second liquid part comprising a combination of curing agents. The second liquid part comprises a first (e.g. ambient temperature) curing agent having an activation temperature at or below 20-25°C and a second latent curing agent having an activation temperature greater than 25°C. The method further comprises applying a mixture of the first and second part such that it contacts at least one substrate and curing the mixture below the activation temperature of the latent curing agent. The method does not include heating the mixture to the activation temperature of the latent curing agent. Rather, the latent curing agent can become activated during use of a substrate or article. In another embodiment, an article is described comprising at least one first substrate bonded with a cured epoxy resin composition wherein the cured epoxy resin composition comprises an uncured latent curing agent having an activation temperature greater than 25°C. Also described is a two-part epoxy resin composition comprising a first liquid part comprising an epoxy resin; and a second liquid part comprising a first curing agent having an activation temperature at or below 20-25°C and a second latent curing agent having an activation temperature greater than 25°C.
Abstract:
In accordance with the present invention there is provided a method of making a metal part assembly, the method comprising: - providing a first metal part and a second metal part wherein at least one of the first and second metal part comprises a metal panel; - providing an adhesive sheet having a first portion near a first end of the adhesive sheet and a second portion near a second end opposite to the first end of the adhesive sheet, the adhesive sheet comprising a thermosettable composition that comprises a mixture of a first and second epoxy compound and an epoxy curing agent, wherein the first epoxy compound has a weight average molecular weight of at least 1000 g/mol and has an amount of epoxy groups of between 5 and 10 mole% and the second epoxy compound has a weight average molecular weight of not more than 400 g/mol and wherein the weight ratio of first to second epoxy compound is between 0.8 and 4; - adhering said first and second metal part together such that the adhesive sheet is provided between said first and second metal part thereby forming a metal joint; and heating the metal joint so as to cause thermosetting of the thermosettable composition of the adhesive sheet.
Abstract:
The present invention relates to a curable precursor of a fire-retardant, low-density and essentially halogen-free epoxy composition comprising (i) 10 to 70 weight percent of at least one organic epoxide compound with an epoxide functionality of at least one, (ii) 1 to 55 weight percent of at least one epoxide hardener, (iii) 5 to 50 weight percent of an essentially halogen-free fire-retardant system that includes a mixture of: (1) at least one compound selected from the group comprising alkaline earth metal hydroxides and aluminium group hydroxides, and (2) at least one phosphorous-containing material, (iv) 10 to 60 weight percent of a filler system capable of reducing the density of the precursor that includes a mixture of (1) at least one low-density inorganic filler having a density of between 0.1 to 0.5 g cm¿-3?, (2)at least one low-density organic filler having a density of between 0.01 to 0.30 g/cm¿-3? and being compressible.
Abstract translation:本发明涉及阻燃,低密度和基本上无卤素的环氧组合物的可固化前体,其包含(i)10至70重量%的至少一种环氧官能度为至少一个的有机环氧化合物,( ii)1至55重量%的至少一种环氧化物硬化剂,(iii)5至50重量%的基本上不含卤素的阻燃体系,其包括以下混合物:(1)至少一种选自以下的化合物: 碱土金属氢氧化物和铝基氢氧化物,和(2)至少一种含磷材料,(iv)10至60重量%的能够降低前体密度的填料体系,其包括(1)在 至少一种密度为0.1至0.5g / cm 3 -3的低密度无机填料,(2)至少一种密度为0.01至0.30g / cm 3 -3的低密度有机填料, 并且是可压缩的。
Abstract:
In one aspect of the present disclosure, there is provided a low-density curable composition precursor, comprising (a) a first part (A) comprising: (i) at least one polymeric diamine; (b) a second part (B) comprising: (i) at least one epoxy resin; (ii) at least one reactive diluent; (iii) at least one amide selected from polyamide waxes; wherein part (A) and/or part (B) comprise a low density filler material having a density of less than 0.3 g/cc; and wherein the curable composition obtained by combining part (A) and part (B) has a cured density according to DIN 53479A of less than 0.5 g/cc.
Abstract:
A curable adhesive composition precursor comprising a first part (A) comprising: at least one diamine in an amount of from 10 to 50 wt.-% based on the total weight of part (A), at least one amine epoxy curing agent based on a phenolic lipid in an amount of from 10 to 50 wt.-% based on the total weight of part (A), and at least one inorganic filler material in an amount of from 10 to 60 wt.-% based on the total amount of part (A); and a second part (B) comprising: at least one first epoxy resin in an amount of from 15 to 60 wt.-% based on the total amount of part (B)), at least one viscosity modifier in an amount of from 1 to 25 wt.-%, based on the total weight of part (B), and at least one epoxy-reactive flexibilizer in an amount of from 0.1 to 10 wt.-% based on the total amount of part (B).
Abstract:
The present disclosure provides a curable void filler composition comprising: (a) at least one epoxy resin; (b) at least one epoxy curing agent comprising a carboxylic acid anhydride compound; (c) at least one alkaline oxide and/or at least one alkaline earth oxide.