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High-toughness bridge reinforcing structural adhesive

A technology for strengthening structures and high toughness, which is applied in the direction of non-polymer adhesive additives, adhesives, epoxy resin glue, etc., and can solve the problems of affecting structural adhesiveness, affecting the life of structural adhesives, and adversely affecting the sealing performance of structural adhesives. , to achieve the effect of ensuring fluidity, simple composition, and suitable for promotion

Inactive Publication Date: 2020-03-24
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the structural adhesives used in bridge construction generally need to add rubber tougheners in order to improve the toughness. Such tougheners may affect the viscosity of the structural adhesives, thereby affecting the life of the structural adhesives and the sealing performance of the structural adhesives. In addition, since the structural adhesive is generally prepared by two-component mixing, in order to avoid foaming during the preparation process, it is necessary to add a defoamer to prevent the foam from being brought into the cured structural adhesive and affect the mechanical properties of the structural adhesive.

Method used

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  • High-toughness bridge reinforcing structural adhesive
  • High-toughness bridge reinforcing structural adhesive
  • High-toughness bridge reinforcing structural adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Table 1 is the composition content of A component and B component in the high-toughness bridge reinforcement structural adhesive of embodiment 1:

[0025] Table 1

[0026]

[0027]

[0028] In this example, the polyether modified siloxane in component A is RSi(CH 3 ) 2 (OSi(CH3) 2 ) m OSi(CH 3 ) 2 R, where m=10, R is -C 3 h 6 (C 2 h 4 O) a (C 3 h 6 O) b (C 3 h 5 O), wherein a=10, b=10;

[0029] In this example, the proportion of component A and component B is 1:1. Add component B to component A according to the proportion of ingredients, disperse until the colloid is uniform and fine, and then vacuum stir and defoam, according to the size in GB2567-2008 Pouring in the corresponding mold, removing the mold after curing at room temperature for 7 days, and testing the tensile strength and bending strength immediately.

Embodiment 2

[0031] Table 2 is the composition content of A component and B component in the high-toughness bridge reinforcement structural adhesive of embodiment 2:

[0032] Table 2

[0033]

[0034] In this example, the polyether modified siloxane in component A is RSi(CH 3 ) 2 (OSi(CH3) 2 ) m OSi(CH 3 ) 2 R, where m=50, R is -C 3 h 6 (C 2 h 4 O) a (C 3 h 6 O) b (C 3 h 5 O), wherein a=50, b=40;

[0035] In this example, the proportion of component A and component B is 3:1. Add component B to component A according to the proportion of ingredients, disperse until the colloid is uniform and fine, and then vacuum stir and defoam, according to the size in GB2567-2008 Pouring in the corresponding mold, removing the mold after curing at room temperature for 7 days, and testing the tensile strength and bending strength immediately.

Embodiment 3

[0037] Table 3 is the component content of A component and B component in the high-toughness bridge reinforcement structural adhesive of embodiment 3:

[0038] table 3

[0039]

[0040] In this example, the polyether modified siloxane in component A is RSi(CH 3 ) 2 (OSi(CH3) 2 ) m OSi(CH 3 ) 2 R, where m=20, R is -C 3 h 6 (C 2 h 4 O)a (C 3 h 6 O) b (C 3 h 5 O), wherein a=10, b=20;

[0041] In this example, the proportion of component A and component B is 2:1. Add component B to component A according to the proportion of ingredients, disperse until the colloid is even and fine, and then vacuum stir and defoam, according to the size in GB2567-2008 Pouring in the corresponding mold, removing the mold after curing at room temperature for 7 days, and testing the tensile strength and bending strength immediately.

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Abstract

The invention provides a high-toughness bridge reinforcing structural adhesive. The structural adhesive is prepared from a component A and a component B by blending, wherein the component A comprisesepoxy resin, polyether modified siloxane and a filling material; the polyether modified siloxane has a structure of RSi(CH3)2(OSi(CH3)2)mOSi(CH3)2R, can significantly improve the toughness of the structural adhesive and greatly improve bending strength and tensile strength of a connection position, and has a defoaming effect as a surfactant, wherein m is in a range of 10 to 50, and R is an epoxy-terminated allyl polyether group and has a structure of -C3H6(C2H4O)a(C3H6O)b(C3H5O), wherein a is in a range of 10 to 50, and b is in a range of 10 to 40; and the component B comprises a curing agent,a filling material and a curing promoter; and a small amount of toner is added into the component B, so the color does not change in the long-term use process, and the appearance of the bridge is prevented from being influenced. The structural adhesive is simple in composition, easily available in raw materials and convenient in blending, can be properly adjusted in components according to needsto meet different requirements, can be used for sealing box girder surfaces in a preset segment matching method, and is applicable to popularization.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a high-toughness bridge reinforcement structural glue. Background technique [0002] In recent years, with the rapid development of highway traffic in my country, the preset segment matching method has been widely used in bridge construction, which has the advantages of high construction quality, short construction period, and small impact on traffic. Because the box girder is prefabricated in the factory, the concrete shrinkage and creep of the box girder are small, and the line shape of the girder body after completion is small, which promotes the promotion of the preset segment matching method. [0003] When adjacent sections are matched for construction, it is necessary to apply epoxy structural glue on the surface of the box girder. The purpose of applying the structural glue is to ensure the sealing between the prefabricated box girders, prevent leakage, and preve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J163/00C09J183/12C09J11/04
CPCC08K2003/2275C08K2003/265C08K2003/3045C09J11/04C09J163/00C08L83/12C08K3/36C08K3/34C08K3/30C08K3/26C08K3/22C08K3/04
Inventor 牛杰蒋美蓉潘大荣吉亚安
Owner NANJING INST OF TECH
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