Preparation method of polyurethane modified epoxy resin and grouting material based on the resin

A technology of epoxy resin grouting and polyurethane modification, which is applied in the field of building materials, can solve the problems of low wet bonding strength, poor toughness, and slow curing, and achieve the effects of high resin viscosity, reduced force, and low low-temperature curing strength

Active Publication Date: 2018-01-09
BEIJING TIEKE SHOUGANG RAIL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the polyurethane graft modified epoxy resin interpenetrating network polymer grouting material prepared by the prior art scheme has the problems of poor toughness, slow curing, and low wet bonding strength, thus proposing a low-strength Preparation method of polyurethane modified epoxy resin with good viscosity, good toughness, fast curing and high wet bonding strength and grouting material based on the resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of polyurethane modified epoxy resin is provided in the present embodiment, and the raw material composition of described polyurethane modified epoxy resin is as follows:

[0028] Epoxy resin E51, 60 parts by weight of epoxy value 0.6mol / 100g; Toluene diisocyanate, 18 parts by weight; Catalyst dibutyltin dilaurate, 0.05 parts by weight; Diluent benzyl glycidyl ether, 50 parts by weight; plasticizer dioctyl phthalate, 10 parts by weight; inorganic toughening agent talcum powder, 20 parts by weight.

[0029] The preparation method of described polyurethane modified epoxy resin is:

[0030] (a) under vacuum conditions, 50wt% of the epoxy resin, that is, 30 parts by weight of the epoxy resin, is first heated to 100°C, stirred for 2h, and then cooled to 50°C;

[0031] (b) adding the above-mentioned isocyanate and catalyst in the epoxy resin described in step (a), and reacting for 3 hours in an inert gas at a temperature of 80° C. to obtain a polyurethane grafted epox...

Embodiment 2

[0038] A kind of polyurethane modified epoxy resin is provided in the present embodiment, and the raw material composition of described polyurethane modified epoxy resin is as follows:

[0039] Epoxy resin E44 with an epoxy value of 0.4mol / 100g, 80 parts by weight; Hexamethylene diisocyanate, 10 parts by weight; Catalyst triethylamine, 0.5 parts by weight; Diluent ethylene glycol glycidyl ether, 10 parts by weight ; Plasticizer diethyl phthalate, 20 parts by weight; Inorganic toughening agent fumed silica, 5 parts by weight.

[0040] The preparation method of described polyurethane modified epoxy resin is:

[0041] (a) under vacuum conditions, 40wt% of the epoxy resin, that is, 32 parts by weight of the epoxy resin, is first heated to 110°C, stirred for 1h, and then cooled to 60°C;

[0042] (b) adding isocyanate and a catalyst to the epoxy resin described in step (a), and reacting for 1 h in an inert gas at a temperature of 90° C. to obtain a polyurethane grafted epoxy resin;...

Embodiment 3

[0049] A kind of polyurethane modified epoxy resin is provided in the present embodiment, and the raw material composition of described polyurethane modified epoxy resin is as follows:

[0050] Epoxy resin E44 with an epoxy value of 0.45mol / 100g, 70 parts by weight; Dicyclohexylmethane diisocyanate, 25 parts by weight; Catalyst stannous octoate, 0.2 parts by weight; Thinner o-cresol glycidyl ether, 30 parts by weight ; Plasticizer epoxy dioctyl tetrahydrophthalate, 15 parts by weight; Inorganic toughening agent fumed silica, 5 parts by weight.

[0051] The preparation method of described polyurethane modified epoxy resin is:

[0052] (a) under vacuum conditions, 60wt% of the epoxy resin, that is, 42 parts by weight of the epoxy resin, is first heated to 110°C, stirred for 1h, and then cooled to 60°C;

[0053] (b) adding isocyanate and a catalyst to the epoxy resin described in step (a), and reacting for 1 h in an inert gas at a temperature of 90° C. to obtain a polyurethane g...

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Abstract

The invention provides a preparation method of polyurethane modified epoxy resin. Firstly, isocyanate is used to react with hydroxyl groups on epoxy resin under certain conditions to obtain polyurethane grafted epoxy resin, and then the polyurethane is grafted with monohydric alcohol. The isocyanate on the grafted epoxy resin is blocked, so that the unit of isocyanate is used to block the epoxy resin, and the polyurethane short chain is grafted on the epoxy resin, so that the distance between the epoxy resin molecules is increased, the intermolecular force is reduced, and the chain is improved. The movement ability of the segment, and at the same time reduce the viscosity of the slurry and toughen the effect; thus the grouting material based on the polyurethane modified epoxy resin of the present invention can effectively reduce the physical crosslinking between molecules, and has strong permeability and good toughness , The data shows that its compressive strength exceeds 70MPa, tensile strength exceeds 20MPa, dry bond strength exceeds 5Mpa, and wet bond strength exceeds 3MPa.

Description

technical field [0001] The invention relates to a preparation method of polyurethane modified epoxy resin and a grouting material based on the resin, belonging to the technical field of building materials. Background technique [0002] Epoxy resin has the characteristics of high bonding strength, can be cured at room temperature, small shrinkage rate of cured products, excellent mechanical properties and good corrosion resistance, etc. It is widely used as adhesives, coatings, grouting materials, etc. in electronics, machinery, and civil engineering and many other fields. Epoxy resin grouting is to use epoxy resin as the main agent, add a certain diluent and curing agent to prepare epoxy resin grouting slurry, and then use grouting equipment to pour it into the formation cracks and concrete cracks under certain process conditions In order to achieve anti-seepage plugging and reinforcement of the poured body, so that the building can operate safely. Epoxy resin grouting mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08L63/00C08G18/65C08G18/58C08G59/62
Inventor 杨富民刘志马荣田张远庆陈玉琪张雯
Owner BEIJING TIEKE SHOUGANG RAIL TECH CO LTD
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