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A high-temperature-resistant, high-humidity slow-bonding prestressed threaded steel bar and its preparation method

A technology of slow bonding prestressed and threaded steel bars, applied in the direction of adhesives, adhesive types, epoxy resin glue, etc., can solve the problems of high temperature and high humidity resistance, high and low temperature alternating performance, etc., to achieve excellent high temperature resistance Low temperature alternating performance, simple preparation process, good high temperature resistance effect

Active Publication Date: 2022-03-22
BEIJING ACAD OF BUILDING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The slow bonding agent in the slow bonding prestressing technology disclosed in the above patent has a suitable pot life, good fluidity and adhesion in the early stage, can be cured at room temperature, and has good heat resistance, insulation and Strength, but there are also the above shortcomings, high temperature and high humidity performance, high and low temperature alternating performance is poor

Method used

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  • A high-temperature-resistant, high-humidity slow-bonding prestressed threaded steel bar and its preparation method

Examples

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Comparison scheme
Effect test

preparation example 1

[0044] 1. Add 2,2-difluoromalonic acid and triethylenetetramine with a molar ratio of carboxyl group to primary amino group of 1:1.3 into the reactor under nitrogen atmosphere, pressurize to 0.3MPa, and wait for 1.5h Heat up to 160°C while stirring inside, at this time the pressure rises to 1.8MPa, keep the pressure constant by intermittently removing the generated water vapor and keep the temperature in the kettle at 160°C for 2 hours;

[0045] 2. Release the pressure of the reactor to normal pressure, and react at a constant temperature of 160°C; then evacuate to -0.08MPa, and react at a constant temperature of 160°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 ;

[0046] 3. Cool the reactor to 23°C, stop stirring, and discharge the material to obtain the fluorine-containing polyamide.

preparation example 2

[0048] The rest is the same as Preparation Example 1, except that in step 1, the temperature is raised to 130°C while stirring within 2h, and finally the generated water vapor is kept constant by intermittently removing the pressure and the temperature in the kettle is kept at 130°C for 3h;

preparation example 3

[0050] The rest are the same as in Preparation Example 1, except that 2,2-difluoromalonic acid and triethylenetetramine with a molar ratio of carboxyl and primary amino groups of 1:1.1 are added to a reactor under a nitrogen atmosphere for reaction.

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Abstract

A high-temperature and high-humidity resistant slow-bonding prestressed threaded steel bar and a preparation method thereof, the slow-bonded prestressed threaded steel bar includes a retarding binder, a prestressed threaded steel bar, and a sheath, and the slowing-setting binder It includes main resin, curing agent, diluent and filler. The curing agent is a compound of fluorine-containing polyamide and low molecular weight polyamide. . The present invention prepares low-molecular-weight fluorine-containing polyamides through the amidation reaction of fluorine-containing diacids and polybasic primary amines, uses fluorine-containing polyamides and common low-molecular-weight polyamides to cure the main resin in the slow-setting adhesive together, and obtains a cured Finally, it has good high temperature resistance, high humidity performance and high and low temperature alternating performance slow bonded prestressed rebar. The slow-bonding prestressed threaded steel bar of the invention has a simple preparation process, is green and pollution-free, is suitable for any slow-bonding prestressed concrete construction sites, and is suitable for expanding chemical industrial production.

Description

technical field [0001] The invention belongs to the technical field of building components, and in particular relates to a high-temperature and high-humidity slow-bonding prestressed threaded steel bar and a preparation method thereof. Background technique [0002] Prestressing technology is quite common, especially suitable for projects such as large-span and circular pools. Generally, unbonded prestressing technology is commonly used, but the free sliding of unbonded prestressed tendons makes prestressed tendons and end anchors extremely prone to fatigue. Concrete components are easy to crack; bonded prestressing technology is that the prestressed tendons are connected with the concrete. After curing, the prestressed tendons can no longer expand and contract freely. Fatigue and cracking problems of technology, but there is a large weakening of the structural section due to reserved channels, and cumbersome and complicated construction procedures such as reserved channels a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J163/02C08G69/42C08G59/44
CPCC09J163/00C08G69/42C08G59/44C08L2201/08C08L77/06
Inventor 吕李青张鹏张喆杜彦凯陈彬毅支超刘鲁张慧颖
Owner BEIJING ACAD OF BUILDING ENG
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