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High-temperature-resistant and high-humidity-resistant retard-bonded prestressed twisted steel and preparation method thereof

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

Active Publication Date: 2020-07-31
BEIJING ACAD OF BUILDING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • High-temperature-resistant and high-humidity-resistant retard-bonded prestressed twisted steel and preparation method thereof

Examples

Experimental program
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

The invention discloses high-temperature-resistant and high-humidity-resistant retard-bonded prestressed twisted steel and a preparation method thereof. The retard-bonded prestressed twisted steel comprises a retarding binder, a prestressed twisted steel body and a sheath, wherein the retarding binder comprises matrix resin, a curing agent, a diluent and filler; the curing agent is a compound of fluorine-containing polyamide and low-molecular-weight polyamide, and the fluorine-containing polyamide is obtained through reaction of raw materials including fluorine-containing diacid and polybasicprimary amine. According to the invention, the low-molecular-weight fluorine-containing polyamide is prepared through amidation reaction of the fluorine-containing diacid and the polybasic primary amine; the fluorine-containing polyamide and the common low-molecular-weight polyamide are used for curing the matrix resin in the retarding binder together to obtain the retard-bonded prestressed twisted steel with favorable high-temperature resistance, favorable high-humidity resistance and favorable high / low-temperature alternating resistance after curing. The retard-bonded prestressed twisted steel is simple in preparation process, green, free of pollution, suitable for any retard-bonded prestressed concrete construction site and suitable for expanded 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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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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