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Epoxy adhesive toughened by tertiary-amide modified liquid nitrile butadiene rubber

A technology of liquid nitrile rubber and epoxy adhesive, which is applied in the direction of adhesives, adhesive types, epoxy resin glue, etc., and can solve the problem of reducing the crosslinking density of epoxy resin curing, affecting the high-temperature performance of the adhesive, Epoxy adhesives are brittle and other problems, to achieve the effect of increasing the curing crosslinking density, ensuring the toughening effect, good mechanical properties and toughness

Active Publication Date: 2016-11-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The untoughened epoxy adhesive is brittle and has poor impact resistance; after toughening, the elongation at break and impact resistance of the epoxy adhesive have been rapidly improved, but it may also bring some unfavorable factors. For example, toughening leads to a decrease in the cross-linking density of epoxy resin curing, which affects the high-temperature performance of the adhesive, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] The composition of the epoxy adhesive toughened by tertiary amine modified liquid nitrile rubber: 100g bisphenol A epoxy resin, 50g polyamide 651 curing agent, 40g tertiary amine modified liquid nitrile rubber, mix well and then cure, room temperature Cured for 7 days. Main properties of epoxy adhesive: tensile strength 31.3MPa, elongation at break 16.9%, impact strength 62.1kJ / m 2 , high temperature glass transition temperature 93.7 ℃.

[0010] Blank comparison: the untoughened epoxy adhesive prepared by 100g bisphenol A epoxy resin and 50g polyamide 651 has a tensile strength of 53.7MPa, an elongation at break of 3.3%, and an impact strength of 12.2kJ / m 2 , high temperature glass transition temperature 87.7 ℃.

Embodiment 2

[0012] Preparation of tertiary amine modified liquid nitrile rubber toughened epoxy adhesive: 100g bisphenol F epoxy resin, 47.4g polyamide 651 curing agent, 60g tertiary amine modified liquid nitrile rubber, after mixing evenly, React at 23°C for 5 days. Main properties of epoxy adhesive: tensile strength 20.7MPa, elongation at break 19.2%, impact strength 84.3kJ / m 2 , high temperature glass transition temperature 96.3 ℃.

[0013] Blank comparison: the untoughened adhesive prepared by 100g bisphenol F epoxy resin and 47.4g polyamide 651 has a tensile strength of 54.7MPa, an elongation at break of 3.0%, and an impact strength of 11.5kJ / m 2 , high temperature glass transition temperature 86.2 ℃.

Embodiment 3

[0015] Preparation of the epoxy adhesive toughened by tertiary amine modified liquid nitrile rubber: 100g bisphenol A type epoxy resin, 10g triethylenetetramine, 25g tertiary amine modified liquid nitrile rubber, after mixing evenly, cure, 50 Cure for 1 day. Main properties of epoxy adhesive: tensile strength 33.8MPa, elongation at break 5.6%, impact strength 26.7kJ / m 2 , high temperature glass transition temperature 112.1 ℃.

[0016] Blank comparison: 100g bisphenol A epoxy resin and 10g triethylenetetramine prepared untoughened adhesive, the tensile strength is 65.3MPa, the elongation at break is 2.1%, and the impact strength is 7.3kJ / m 2 , high temperature glass transition temperature 90.6 ℃.

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PUM

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Abstract

The invention discloses an epoxy adhesive toughened by tertiary-amide modified liquid nitrile butadiene rubber. The adhesive is prepared from the following components in parts by weight: 100 parts of bisphenol-A or bisphenol-F epoxy resin, 8 to 60 parts of amine curing agent and 10 to 70 parts of tertiary-amide modified liquid nitrile butadiene rubber. The curing condition is that all components are uniformly mixed and are cured at a room temperature for 4 to 7 days or are cured at a temperature of 50 DEG C for 1 day. The adhesive has main properties that the tensile strength is 20 to 40 MPa, the elongation at break is 5 percent to 30 percent, the impact strength is 20 to 150 kJ / m2 and high-temperature glass transition temperature is 90 to 120 DEG C. The toughened epoxy adhesive disclosed by the invention has the advantages that excellent mechanical property and excellent toughness are obtained; the curing cross-linking density of the epoxy resin is improved, the high-temperature glass transition temperature of the epoxy adhesive is not reduced, and the high-temperature usage temperature of the adhesive is not reduced while the adhesive is toughened by utilization of the characteristics of catalyzing and curing epoxy functional groups by a tertiary amine group.

Description

technical field [0001] The invention relates to a tertiary amine-modified liquid nitrile rubber toughened epoxy adhesive, which belongs to the technical field of adhesives. Background technique [0002] Epoxy adhesives have the characteristics of excellent mechanical strength, heat resistance, medium resistance, electrical performance, adhesive performance and molding processing performance, and are widely used in aerospace, shipbuilding, electronics, machinery and other fields. The untoughened epoxy adhesive is brittle and has poor impact resistance; after toughening, the elongation at break and impact resistance of the epoxy adhesive have been rapidly improved, but it may also bring some unfavorable factors. For example, toughening leads to a decrease in the cross-linking density of epoxy resin curing, which affects the high-temperature performance of the adhesive. Liquid nitrile rubber is a common toughener for epoxy adhesives, including liquid-terminated carboxylated ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J163/00C09J115/00C08C19/22
CPCC09J163/00C08C19/22C08L15/00
Inventor 全一武高文通陈庆民
Owner NANJING UNIV
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