Heat-curable eproxy resin composition

a technology of eproxy resin and composition, which is applied in the direction of epoxy resin adhesives, graft polymer adhesives, adhesive types, etc., can solve the problems of insufficient strength at high temperatures and in particular at low temperatures, and the brittleness of conventional epoxy adhesives

Inactive Publication Date: 2005-07-21
SIKA SCHWEIZ AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the bond is subjected to impact loading, however, conventional epoxy adhesives are usually too brittle; and so under crash conditions, when both high tensile and high peel stresses occur, they are far from able to meet the requirements of the automobile industry in particular.
They also have insufficient strengths at high temperatures and in particular at low temperatures.
This results in formation of highly elastic domains in the hard brittle epoxy matrix, which increase the impact strength.
A considerable drawback of the prior art is generally that by increasing the impact strength, the glass transition temperature and/or the strength...

Method used

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Examples

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examples

[0061] A few examples are given below which illustrate the invention further but do not limit the scope of the invention in any way. The raw materials used in the examples are as follows:

Raw materials usedSupplierDimerized C18 fatty acid (Pripol 1013)UniquemaAdipic acidBASF2,2-Bis(4-hydroxyphenyl)propaneFluka AGBis(4-hydroxyphenyl)sulfoneFluka AGBisphenol-A diglycidyl ether (= DGEBA)VanticoPolypropylene glycol diglycidyl ether (ED-506)Asahi-Denka KogyoDicyanodiamide (= Dicy)DegussaPolypropylene ether polyol (Mw = 2000 g / mol)BayerIsophorone diisocyanate (= IPDI)Degussa-HülsCaprolactamEMS ChemieN-ButylamineBASF4,4′-Diphenylmethylene diisocyanate (= MDI)BayerCore / shell polymer (F-351)ZeonTriphenylphosphineFlukaDibutyltin dilaurateWitco Europe

[0062] General preparation for preparing epoxy adduct B and its mixture with A (=A / B premix):

[0063] A / B Premix PM1

[0064] Under vacuum and with stirring at 110° C., 123.9 g of a dimeric fatty acid, 1.1 g triphenylphosphine, and 57.3 g adipic aci...

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PUM

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Abstract

The invention relates to compositions containing at least one epoxy resin A with on average more than one epoxy group per molecule; at least one epoxy adduct B with on average one epoxy group per molecule; at least one thixotropic agent C, based on a urea derivative in a non-diffusing support material; and at least one curing agent D for epoxy resins, which is activated by an increased temperature. According to preferred embodiments, the invention also relates to compositions containing at least one core-shell polymer E and/or filler F and/or reactive diluent G. The invention also relates to the use of said compositions as a single-component adhesive and to a method for producing the compositions. The invention further relates to the use of the thixotropic agent C, based on a urea derivative in a non-diffusing support material as an agent for increasing the impact resistance.

Description

TECHNICAL FIELD [0001] The invention relates to heat-cured compositions which are distinguished by both high impact strength and a high glass transition temperature at the same time, and which in particular can be used as one-component adhesives. PRIOR ART [0002] High-quality adhesives are increasingly used in manufacture of both vehicles and mounted parts or machinery and equipment, either instead of or in combination with conventional joining methods such as riveting and punching or welding. This results in advantages and new options for manufacturing, for example manufacture of composite and hybrid materials, or greater freedom in designing components. For use in vehicle manufacture, adhesives must have good adhesion to all substrates used, in particular electrogalvanized, hot-dip galvanized, and subsequently phosphatized sheet steel, lubricated sheet steel, as well as various types of aluminum. These good adhesion properties must also be maintained in particular after aging (alt...

Claims

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Application Information

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IPC IPC(8): C08G18/10C08G59/20C08G59/38C08L63/00C08L75/00C08L75/04C08L75/12C09J151/00C09J163/00C09J163/02C09J175/00C09J175/04C09J175/12C09K3/10
CPCC08G18/10C08G59/20C08G59/38C08L63/00C08L75/00C08L75/12C09J175/12C09K3/10C08G18/7664C08G18/285C08G18/58C08L2666/14C08L2666/24
Inventor KRAMER, ANDREAS
Owner SIKA SCHWEIZ AG
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