A slow bonding prestressed steel bar and its preparation method

A technology of slow-bonding prestressed and prestressed steel rods, which is applied in the direction of adhesives, structural elements, adhesive types, etc., and can solve the problems of poor compatibility of the main resin, slowing of adhesive peeling, falling off, and large amount of fillers, etc. problems, to achieve the effect of improving high and low temperature alternating performance, improving wettability and dispersibility, and improving high temperature and high humidity performance

Active Publication Date: 2022-05-20
BEIJING ACAD OF BUILDING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents all use fillers to toughen and strengthen the retarding adhesive, but compared with the main resin, the amount of filler is relatively large, the compatibility with the main resin is poor, and it is easy to mix unevenly, resulting in the peeling of the retarding adhesive over time. , falling off, the bending strength of the retarding adhesive has not actually been improved. If the amount is reduced, the strength and toughness of the retarding adhesive will not meet the needs after curing, and the stress retarding steel rod and the surrounding concrete will be stressed first. damaged

Method used

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  • A slow bonding prestressed steel bar and its preparation method

Examples

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Comparison scheme
Effect test

preparation example 1

[0048] The preparation of preparation example 1 fluorine-containing polyamide

[0049] 1. Add tetrafluorosuccinic acid and tetraethylenepentamine with a molar ratio of carboxyl group to primary amino group of 1:1.2 into the reactor under nitrogen atmosphere, pressurize to 0.3MPa, and stir within 1.5h While raising the temperature to 140°C, the pressure rises to 1.8MPa at this time, keep the pressure constant by intermittently removing the generated water vapor and keep the temperature in the kettle at 150°C for 2 hours;

[0050] 2. Release the pressure of the reactor to normal pressure, and react at a constant temperature of 140°C; then evacuate to -0.08MPa, and react at a constant temperature of 140°C, and finally pressurize the reactor to normal pressure and lower the temperature to 60°C, continue to stir and react at a constant temperature for 1h ;

[0051] 3. Cool the reactor to 23°C, stop stirring, and discharge the material to obtain the fluorine-containing polyamide. ...

preparation example 2

[0063] Preparation Example 2 Preparation of Modified Filler

[0064] S1. Add 100 parts of light calcium carbonate with an average particle size of 30 μm to a heating type high-speed mixer, raise the temperature to 100°C for preheating and drying, then cool down to 50°C, and keep the constant temperature at a speed of 500r / min. Under stirring conditions, add 0.5 parts of ammonia water with a concentration of 15%;

[0065] S2. Spray 3 parts of 3-(2,3-glycidoxypropyl)trimethoxysilane on the surface of the filler, increase the speed to 1300r / min and stir for 50min, then stop stirring and cool to room temperature to obtain the modified filler.

preparation example 3

[0067] The rest is the same as Preparation Example 2, except that the amount of 3-(2,3-glycidoxypropyl)trimethoxysilane is 1 part.

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Abstract

The invention provides a slow-bonding prestressed steel rod and a preparation method thereof. The slow-bonding prestressed steel rod includes a prestressed steel rod, a slow-bonding agent, and a sheath, and the slow-bonding agent includes a main body resin, a curing agent, diluent, modified filler, the modifier of the modified filler is an epoxy silane coupling agent, and the curing agent is a compound of fluorine-containing polyamide and low molecular weight polyamide. Adhesion retarding agent uses epoxy silane coupling agent to modify the filler to improve the wettability and dispersibility of the filler in the main resin, and at the same time, the reaction between the epoxy group on the modified filler and the amine group on the curing agent is further improved. The interaction force between the filler and the main resin improves the bending strength; the compound curing agent of fluorine-containing polyamide and low molecular weight polyamide can improve the high temperature and high humidity resistance and high and low temperature alternating performance of the retarding adhesive . It is also found that there is a synergistic effect between the modified filler and the compounded curing agent, and adjusting the amount of both can help to increase the heat distortion temperature of the retarding adhesive.

Description

technical field [0001] The invention belongs to the technical field of building components, and in particular relates to a slow bonded prestressed steel bar and a preparation method thereof. Background technique [0002] In the 1980s, from the perspective of convenient construction and reasonable force transmission mechanism, Japan developed a new type of prestressed concrete technology, namely slow bonding, on the basis of bonded prestressed and unbonded prestressed concrete structures. Prestressed concrete technology. Delayed bonding prestressing technology is a form of prestressing that realizes the gradual transition from no bonding to bonding between prestressed tendons and concrete through the curing of the slowing binder. The cured slowing binder is the force transmission mechanism. Its performance has a great influence on the performance of slow bonding prestressed concrete. [0003] The main resin of the slow adhesive is epoxy resin. Epoxy resin is a kind of resin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04C5/02E04C5/20C09J163/00C09J11/04C08G59/44
CPCE04C5/02E04C5/20C09J163/00C09J11/04C08G59/44C08K2003/265C08K9/06C08K3/26Y02W30/91
Inventor 吕李青张鹏杜彦凯张喆陈彬毅支超刘鲁艾力
Owner BEIJING ACAD OF BUILDING ENG
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