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Fast-setting two-component epoxy adhesive and its preparing method

An epoxy adhesive and curing agent technology, applied in the direction of adhesives, epoxy resin adhesives, adhesive types, etc., can solve the problems of insufficient curing speed, difficult to control glue adjustment, and volatile curing agent, and achieve applicable performance. Good, low product cost and simple production process

Active Publication Date: 2005-07-20
HUNAN SHENLI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The curing agent used in the existing room temperature curing two-component epoxy adhesive is aliphatic polyamine, the composition is very simple, it can be cured in one to several hours, and the strength can be reached in 3 to 7 days. The disadvantage is that the curing agent is volatile and toxic. Large, the volume ratio of A and B components is generally 8~9:1, the glue adjustment is not easy to control, and the curing speed is not fast enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 30 g of diethylenetriamine, 40 g of bisphenol A, and 10.5 g of thiourea were added to a three-necked flask, and reacted at 90° C. for 2 hours to obtain a modified amine.

[0027] Add 5 g of ethylenediamine to another three-necked flask, dropwise add 9.8 g of mercaptopropionic acid, and react at 50° C. for 1.5 hours to obtain a composite accelerator. Adjust the temperature of the modified amine to 60°C, add the composite accelerator dropwise and react for 2 hours, lower the temperature to 40°C, add 1.4gr-(methacryloyloxy)propyltrimethoxysilane, and stir for 30 minutes to obtain B component curing agent.

[0028] Get this curing agent 5g, E-44 epoxy resin 5g, mix on the cardboard and prepare the sample immediately, measure the tensile shear strength according to GB7124-86 "Adhesive Tensile Shear Strength Determination Method (Metal to Metal)" . Unlike GB7124-86, the sample is parked at 30°C.

[0029] The test result shows that the gelation time is 5 minutes, and the te...

Embodiment 2

[0030] [Example 2] 25 g of tetraethylenepentamine, 45 g of bisphenol F, and 14 g of thiourea were added to a three-necked flask and reacted at 75° C. for 2.5 hours to obtain a modified amine.

[0031] In another three-necked flask, 5 g of triethylamine was added, 8 g of mercaptopropionic acid was added dropwise, and the mixture was reacted at 60° C. for 1.5 hours to obtain a composite accelerator.

[0032] Adjust the temperature of the modified amine to 60°C, add the composite accelerator dropwise and react for 2.5 hours, lower the temperature to 40°C, add 2.5g r-glycidoxypropyltrimethoxysilane, and stir for 30 minutes to obtain Group B sub-curing agent. Get this curing agent 5g, E-44 epoxy resin 5g, mix on the cardboard and prepare the sample immediately, measure the tensile shear strength according to GB7124-86 "Adhesive Tensile Shear Strength Determination Method (Metal to Metal)" . Unlike GB7124-86, the sample is parked at 30°C.

[0033] The test result shows that the g...

Embodiment 3

[0035] Add 35 g of trimethylhexamethylenediamine, 40 g of hydroxyl-terminated polyester, and 9 g of thiourea into a three-necked flask, and react at 75° C. for 2.5 hours to obtain a modified amine.

[0036] In another three-necked flask, 5 g of triethylamine was added, 6 g of mercaptopropionic acid was added dropwise, and reacted at 60° C. for 1.5 hours to obtain a composite accelerator.

[0037] Adjust the temperature of the modified amine to 60°C, add the composite accelerator dropwise and react for 2.5 hours, lower the temperature to 40°C, add 2.5g r-glycidoxypropyltrimethoxysilane, and stir for 30 minutes to obtain Group B sub-curing agent. Get this curing agent 5g, E-44 epoxy resin 5g, mix on the cardboard and prepare the sample immediately, measure the tensile shear strength according to GB7124-86 "Adhesive Tensile Shear Strength Determination Method (Metal to Metal)" . Unlike GB7124-86, the sample is parked at 30°C. The test result shows that the gelation time is 8 m...

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Abstract

The present invention discloses one kind of fast curing double-component epoxy adhesive and its preparation process. The adhesive comprises component A comprising epoxy resin or modified epoxy resin and plasticizer or roughener; and component B comprising modified amine curing agent, composite promoter and coupling agent. The adhesive features that of the component B, the modified amine curing agent is prepared with aliphatic polyamine 20-40 wt%, hydroxyl compound 40-50 wt% and thiourea compound 8-15 wt% and through reaction at 70-120 deg.c; and the composite promoter is prepared with mercapto compound 30-50 wt% and Lewis base 50-70 wt% and through reaction at 40-80 deg.c. After mixing, the adhesive may form gel in 3-8 min at room temperature and have strength reaching 6.7 MPa in 30 min.

Description

technical field [0001] The invention relates to a fast-curing two-component epoxy adhesive and a preparation method. Background technique [0002] Epoxy adhesives are generally composed of two components, A and B. Component A generally contains epoxy resin or modified epoxy resin, plasticizer or toughener; component B generally contains curing agent, accelerator, coupling agent etc. The curing agent used in the existing room temperature curing two-component epoxy adhesive is aliphatic polyamine, the composition is very simple, it can be cured in one to several hours, and the strength can be reached in 3 to 7 days. The disadvantage is that the curing agent is volatile and toxic. Large, the volume ratio of A and B components is generally 8~9:1, the glue adjustment is not easy to control, and the curing speed is not fast enough. CN87100265A discloses a modified amine curing agent made from diamine, bisphenol A, and acrylonitrile. An imidazole accel...

Claims

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Application Information

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IPC IPC(8): C09J163/00
Inventor 袁素珍李冬月王理尧袁宏伟
Owner HUNAN SHENLI IND
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