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
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0043] 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 in a nitrogen atmosphere, pressurize it to 0.3MPa, and hold for 1.5h While stirring inside, the temperature is raised to 160°C, and the pressure rises to 1.8MPa at this time. The pressure is kept constant by intermittently removing the generated steam and the temperature in the kettle is kept at 160°C for 2h;
[0045] 2. Relieve the pressure of the reactor to normal pressure and react at a constant temperature of 160℃; then vacuum to -0.08MPa, react at a constant temperature of 160℃, and finally pressurize the reactor to normal pressure and lower the temperature to 60℃, continue to stir and react at a constant temperature for 1h ;
[0046] 3. Cool the reaction kettle to 23°C, stop stirring, discharge the material, and obtain a fluorine-containing polyamide.
Example Embodiment
[0047] 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 2 hours, and finally the pressure is kept constant by intermittently removing the generated water vapor and the temperature in the kettle is kept at 130°C for 3 hours;
Example Embodiment
[0049] Preparation Example 3
[0050] The rest is the same as Preparation Example 1, except that 2,2-difluoromalonic acid and triethylenetetramine with a molar ratio of carboxyl group to primary amine group of 1:1.1 are added to the reactor in a nitrogen atmosphere. reaction.
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap