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A kind of epoxy mortar reinforced by surface modified fiber

A technology of surface modification and epoxy mortar, which is applied in the field of improving the toughness of epoxy mortar and epoxy mortar with surface modification fiber toughening, which can solve the problems of insufficient toughness and achieve the effect of improving bonding ability and toughness

Active Publication Date: 2019-03-08
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to: aim at the problem of insufficient toughness of existing epoxy mortar materials, modify epoxy mortar by surface modified fibers, and provide a kind of epoxy mortar with better toughness and higher flexural strength / compression resistance Epoxy Mortar Repair and Reinforcement Material with Strength Ratio

Method used

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  • A kind of epoxy mortar reinforced by surface modified fiber
  • A kind of epoxy mortar reinforced by surface modified fiber
  • A kind of epoxy mortar reinforced by surface modified fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the epoxy mortar reinforced by surface modification fiber comprises the following steps:

[0029] (1) Add 20 g of polyacrylonitrile fiber to 1980 g of 4-(2-aminoethyl)-1,2-benzenediol solution with a concentration of 3 mg / mL, which is buffered with 10 mM Tris-HCl at pH=8.2 The solution is configured as a solvent. Then mechanically stirred for 20 minutes to disperse the fibers uniformly in the solution, and reacted at room temperature for 24 hours. Filter and rinse the fibers with distilled water, and then place them in a vacuum oven at 50°C for 48 hours to obtain surface-modified polyacrylonitrile fibers. The polyacrylonitrile fiber has a length of 8-10 mm and a diameter of 12-14 μm.

[0030] (2) Stir and mix 150 parts by weight of 42.5 cement, 300 parts by weight of quartz sand and 1 part by weight of the above-mentioned surface-modified polyacrylonitrile fiber at room temperature, then add 80 parts by weight of bisphenol A epoxy resin E51, ...

Embodiment 2

[0035] The preparation method of the epoxy mortar reinforced by surface modification fiber comprises the following steps:

[0036] (1) Add 40 g of carbon fiber to 1960 g of 4-(2-aminoethyl)-1,2-benzenediol solution with a concentration of 2 mg / mL, which uses 10 mM Tris-HCl buffer solution with pH=8.2 as a solvent to configure. Then mechanically stirred for 15 minutes to disperse the fibers uniformly in the solution, and reacted at room temperature for 36 hours. Filter and rinse the fibers with distilled water, and then place them in a vacuum oven at 60°C for 60 hours to obtain surface-modified carbon fibers. The carbon fiber has a length of 10-15 mm and a diameter of 5-8 μm.

[0037] (2) 200 parts by weight of 42.5 cement, 400 parts by weight of quartz sand and 0.5 parts by weight of the surface-modified carbon fiber in the above steps are stirred and mixed at room temperature, and then 120 parts by weight of bisphenol A type epoxy resin E51, 20 parts by weight are added 3 ...

Embodiment 3

[0042] The preparation method of the epoxy mortar reinforced by surface modification fiber comprises the following steps:

[0043] (1) Add 60 g of glass fiber to 1940 g of 4-(2-aminoethyl)-1,2-benzenediol solution with a concentration of 2 mg / mL, which uses 10 mM Tris-HCl buffer solution with pH=8.2 as Solvents are configured. Then mechanically stirred for 20 minutes to disperse the fibers uniformly in the solution, and reacted at room temperature for 40 hours. Filter and rinse the fibers with distilled water, and then place them in a vacuum oven at 80°C for 48 hours to obtain surface-modified glass fibers. The glass fiber has a length of 10-12 mm and a diameter of 20-30 μm.

[0044] (2) 100 parts by weight of 52.5 cement, 500 parts by weight of quartz sand and 3 parts by weight of the surface-modified glass fiber in the above steps are stirred and mixed at room temperature, and then 90 parts by weight of bisphenol A type epoxy resin E44, 30 parts by weight are added Part d...

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Abstract

The invention discloses epoxy mortar adopting surface modified fibers for toughness enhancement and a preparation method of the epoxy mortar. The epoxy mortar adopting the surface modified fibers for toughness enhancement is prepared from components in parts by weight as follows: 80-120 parts of epoxy resin, 10-30 parts of a diluent, 10-40 parts of a curing agent, 1-3 parts of a defoaming agent, 1-3 parts of a coupling agent, 1-10 parts of an accelerant, 100-200 parts of cement, 300-500 parts of quartz sand and 0.5-3 parts of the surface modified fibers. The epoxy mortar is modified with the fibers which are modified with polydopamine coatings on the surfaces, the polydopamine coatings can remarkably improve bonding capacity between the fibers and an epoxy mortar matrix, so that the surface modified fibers after doping can more effectively inhibit microcracks in the mortar from developing into larger cracks through a crack-bridging effect, toughness of the mortar is remarkably improved, and the epoxy mortar has higher ratio of breaking strength to compressive strength.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an epoxy mortar toughened by surface-modified fibers, which is suitable for improving the toughness of the epoxy mortar. Background technique [0002] For buildings and infrastructure, repairing and reinforcing old or damaged parts with high-quality repair materials is a very economical and effective way to extend their service life. Therefore, users have higher and higher requirements for the performance of repairing and reinforcing materials, such as strong cohesion, high flexural / compressive strength ratio, high fracture toughness, etc., and also require good adhesion with the concrete matrix. Compatibility. At present, there are many kinds of repairing and strengthening materials on the market, including traditional cement-based materials, epoxy resin-based materials, unsaturated polyester resins and polymer emulsions, and there are also some new materials such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B20/02
CPCC04B20/023C04B28/04C04B2201/50C04B24/281C04B16/0658C04B14/06C04B24/023C04B24/42C04B24/121C04B14/386C04B14/42
Inventor 周进俊冉千平孙德文尹浩李波刘玉亭万赟刘娜
Owner JIANGSU SOBUTE NEW MATERIALS