Preparing method of thermally-driven self-repairing elastomer based on hydrogen-bond interaction

A hydrogen bonding, thermally driven technology, applied in the field of preparation of thermally driven self-healing elastomers based on hydrogen bonding, can solve the problems of low elongation, only one-time repairing ability, low repairing efficiency, etc., and achieve high tensile strength and the effect of elongation at break, excellent self-healing properties

Active Publication Date: 2017-01-04
SOUTH CHINA UNIV OF TECH
View PDF5 Cites 50 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, more studies are made on the use of microcapsule self-healing materials coated with repairing agents. Although this repairing material has a certain self-repairing ability, it also has shortcomings, such as: each repairing agent corresponds to a limited matrix and is limited in the material. Each place has only one repair ability; the stability of the microcapsules in the base material is poor and cannot exist stably in the base material for a long time; when the material cracks, it is impossible to ensure that the microcapsules break and release the repair agent every time
At present, self-healing materials prepared by directly capping polyester diols, hydroxyl silicone oils, and polyether diols with Upy have shortcomings such as low strength, poor elasticity, and high repair temperature.
Although the supramolecular polymer prepared by using Upy to end-cap the relatively hard PCDL can obtain higher strength, but its elongation is low, the elasticity is poor, the repair efficiency is low and the repair temperature is high, as shown in the comparison sample in Table 1

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparing method of thermally-driven self-repairing elastomer based on hydrogen-bond interaction
  • Preparing method of thermally-driven self-repairing elastomer based on hydrogen-bond interaction
  • Preparing method of thermally-driven self-repairing elastomer based on hydrogen-bond interaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 40 g of vacuum-dried polycarbonate diol (PCDL) with a molecular weight of 2000 and 1 drop of catalyst (dibutyltin dilaurate) in a three-necked flask equipped with a reflux condenser, raise the temperature to 50 ° C under nitrogen protection, and slowly drop Add measured hexamethylene diisocyanate diluted with 10ml of anhydrous toluene, under mechanical stirring until the -NCO absorption peak in the infrared spectrum disappears, then add 150ml of anhydrous toluene and heat up to 100°C; add Upy-NCO (system residual 1.5 times the number of moles of hydroxyl groups), reacted for about 16 hours under mechanical stirring, and stopped the reaction when the hydroxyl proton peak disappeared under the detection of proton nuclear magnetic spectrum. After cooling to room temperature, the polymer solution was added dropwise to 200 ml of n-hexane to obtain a white precipitate, which was washed and dried several times to obtain a transparent elastic solid. Adjust the molar ratios...

Embodiment 2

[0041] Take 40 g of vacuum-dried polycarbonate diol (PCDL) with a molecular weight of 2000 and 1 drop of catalyst (dibutyltin dilaurate) in a three-necked flask equipped with a reflux condenser, raise the temperature to 60 ° C under nitrogen protection, and slowly drop Add NCO-Upy-NCO dissolved in 100ml of anhydrous toluene, and stop the reaction under mechanical stirring until the -NCO absorption peak in the infrared spectrum disappears. Volatilize in a polytetrafluoroethylene tank at room temperature to obtain a transparent elastic film. Adjust the molar ratio of PCDL and NCO-Upy-NCO to be 1.2 respectively to obtain polyurethane elastomer HPU 1.2 -Upy.

[0042] To characterize the elastomer prepared above, figure 2 for HPU 1.2 -Upy's NMR spectrum, the repair efficiency is shown in Table 1, the results show that HPU 1.2 -Upy has a repair efficiency of 71% at 80°C for 2 hours, a repair efficiency of 91% after repair for 4 hours, and even 95% repair efficiency for 6 hours....

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a preparing method of thermally-driven self-repairing elastomer based on hydrogen-bond interaction. The method comprises the steps that firstly, ureido pyrimidone type mono-isocyanate molecules are prepared, then diisocyanate is used for carrying out chain extension on low polymer glycol to prepare a hydroxyl-terminated polyurethane low polymer, and finally, Upy-terminated type thermally-driven self-repairing elastomer is prepared by terminating the hydroxyl-terminated polyurethane low polymer with UPY-NCO; secondly, ureido pyrimidone type diisocyanate is prepared, then ureido pyrimidone type diisocyanate and the low polymer glycol are subjected to addition polymerization, and the hydrogen bond network type thermally-driven self-repairing elastomer with Upy units in a main chain controllable is prepared. Compared with a traditional foreign-aid type self-preparing material (a micro capsule type, a micro vessel type and the like), the thermally-driven self-repairing material is a thermoplastic material and can be repeatedly processed and used, and theoretically multi-time repairing capability can be achieved at the same position.

Description

technical field [0001] The invention relates to a preparation method of a hydrogen bond intrinsic type polyurethane elastomer material with self-repair function, in particular to a preparation method of a heat-driven self-repair elastomer based on hydrogen bond action. [0002] technical background [0003] When the material is subjected to external mechanical action, it is easy to cause damage to the surface or inside of the material, causing cracks in the material, and seriously affecting the mechanical properties and service life of the material. In order to solve the problem that materials are prone to damage during use, people have introduced the concept of self-repair. As a new type of intelligent material, self-healing materials have important development prospects and application value in some important projects and special fields. [0004] At present, more studies are made on the use of microcapsule self-healing materials coated with repairing agents. Although this ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/71C08G18/78C08G18/44
CPCC08G18/44C08G18/714C08G18/7887
Inventor 刘维锦林峰
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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