Modified epoxy resin adhesive and its preparation process

A technology of epoxy resin and adhesive, which is applied in the direction of epoxy resin glue, adhesive, adhesive type, etc., can solve the problems of brittleness and poor temperature resistance, and achieve excellent oil resistance, good alkali resistance and good bonding performance Effect

Inactive Publication Date: 2005-09-21
李洁华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcoming of brittleness and poor temperature resistance of general epoxy resin adhesive, the present invention combines the advantages of polysiloxane resin and polyurethane to modify epoxy resin adhesive to improve its flexibility properties, adhesive properties, impact strength and heat resistance, etc.

Method used

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  • Modified epoxy resin adhesive and its preparation process
  • Modified epoxy resin adhesive and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of Polysiloxane Polyurethane Prepolymer

[0025] Add 100 g of hydroxyl-terminated polysiloxane resin (Mn=1000) into a three-necked flask with a stirrer and a thermometer, heat to 70-100°C, and vacuum dehydrate for 2 hours, then add 20 g of toluene diisocyanate (TDI), and The polysiloxane polyurethane prepolymer is obtained by reacting at 70-100° C. for 1-3 hours, and the NCO content is 6%.

[0026] Preparation of Modified Epoxy Resin (Component A)

[0027] Put 80g of bisphenol A epoxy resin (R-140) and 20g of polysiloxane polyurethane prepolymer (NCO content is 6%) into the reactor, heat up and stir, and start vacuuming when the temperature rises to 90°C (remaining pressure 10 ~ 30mmHg) and constant temperature reaction for 2 hours.

[0028] Preparation of Curing Agent Components (Part B)

[0029] Add 20g of hexamethylenediamine into the reactor, heat to 100°C, stir and add 8g of 2-methylimidazole, keep 100°C under vacuum for 2 hours, then add 4g of γ-ami...

Embodiment 2

[0032] Preparation of Polysiloxane Polyurethane Prepolymer

[0033]Add 100 g of hydroxyl-terminated polysiloxane resin (Mn=1000) into a three-neck flask with a stirrer and a thermometer, heat to 70-100°C, and vacuum dehydrate for 2 hours, then add 20.3 g of toluene diisocyanate (TDI), The polysiloxane polyurethane prepolymer is obtained by reacting at 70-100 DEG C for 1-3 hours, and the NCO content is 8%.

[0034] Preparation of Modified Epoxy Resin (Component A)

[0035] Add 90g of bisphenol A epoxy resin (R-140) and 10g of polysiloxane polyurethane prepolymer (8% NCO content) into the reactor, heat and stir, and start vacuuming when the temperature rises to 90°C (remaining pressure 10 ~ 30mmHg) and constant temperature reaction for 2 hours.

[0036] Preparation of Curing Agent Components (Part B)

[0037] Add 15g of N,N-diamino-diphenylmethane into the reactor, heat up to 100°C, add 10g of imidazole with stirring, keep 100°C under vacuum for 2 hours, then add γ-aminopropy...

Embodiment 3

[0040] Preparation of Polysiloxane Polyurethane Prepolymer

[0041] Add 100 g of hydroxyl-terminated polysiloxane resin (Mn=1000) into a three-necked flask with a stirrer and a thermometer, heat to 70-100°C, and vacuum dehydrate for 2 hours, then add 19.5 g of toluene diisocyanate (TDI), The polysiloxane polyurethane prepolymer is obtained by reacting at 70-100 DEG C for 1-3 hours, and the NCO content is 4%.

[0042] Preparation of Modified Epoxy Resin (Component A)

[0043] Add 70g of bisphenol A epoxy resin (R-140) and 30g of polysiloxane polyurethane prepolymer (NCO content is 4%) into the reactor, heat up and stir, and start vacuuming when the temperature rises to 90°C (remaining pressure 10 ~ 30mmHg) and constant temperature reaction for 2 hours.

[0044] Preparation of Curing Agent Components (Part B)

[0045] Add 25g of hexamethylenediamine into the reactor, heat up to 100°C, stir and add 4g of 2-methylimidazole, keep it under vacuum at 100°C for 2 hours, then add 6g...

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Abstract

The invention relates to a modified epoxide resin adhesive agent and its preparation process to overcome the disadvantage such as brittleness and bad temperature resistance of common epoxide resin adhesive agents, which comprises: mixing the epoxide resin (component A) modified by polyurethane prepolymer and curing agent (component B) produced by author in the proportion of between 10:1 to 1:1 to prepare the curing system of fire resistant, good toughness and large reaction, wherein the polyurethane prepolymer is polysiloxane polyurethane prepolymer capped by isocyanate groups which are produced by the reaction of hydroxy-terminated polysiloxane and diisocyanate in a definite proportion, then using the said polyurethane prepolymer to modified treat epoxide resin. The said curing agent produced by author is made of diamine, imidazolinium compounds, silane coupling agents, mineral filler and catalyst. The said modified epoxide resin adhesive agent can be cured in room temperature and has the good characteristics of oil resistant, water resistant, acid and alkali resistant and resistance to organic solvent, also can adhere to the damp face, oil face, metal, plastic, ceramic, hard rubber and wood and so on.

Description

technical field [0001] The invention relates to a modified epoxy resin adhesive and a preparation method thereof. Background technique [0002] Epoxy resin is a very good adhesive substrate, but its cured product has disadvantages such as poor deformability, high brittleness, low peel strength, poor heat resistance, and easy degradation at high temperature. Therefore, toughening epoxy resin is an active research field. Adopt acrylonitrile-butadiene rubber, acrylic ester rubber, polyurethane, polysiloxane and other elastomers to modify epoxy resin as a large number of studies, such as CN 1015989B adopts carboxyl-terminated nitrile rubber to carry out toughening epoxy resin, and has obtained Good toughening effect. There is also research using liquid carboxyl-terminated polyacrylate modified epoxy resin [J. APPLIED POLYMER SCIENCE, 1997 (65): 1751-1757] to pre-react epoxy groups and carboxyl groups under the action of a catalyst, and the curing of the system The time will b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J163/00
Inventor 李洁华
Owner 李洁华
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