Room-temperature self-repairing polyurethane based on multiple self-repairing units and preparation method thereof

A self-healing and polyurethane technology, which is applied in the field of polyurethane and its preparation based on multiple self-healing units at room temperature self-healing, can solve the problems of poor self-healing ability under mild conditions, poor mechanical properties, low service life and functional reliability, and achieve Good mechanical properties, improved mechanical properties, excellent mechanical properties

Pending Publication Date: 2022-07-15
江苏富琪森新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a polyurethane based on multiple self-repairing units self-repairing at room temperature and its preparation method to solve the problem of low service life and functional reliability of current polyurethane materials, poor mechanical properties, and poor self-repairing ability under mild conditions The problem

Method used

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  • Room-temperature self-repairing polyurethane based on multiple self-repairing units and preparation method thereof
  • Room-temperature self-repairing polyurethane based on multiple self-repairing units and preparation method thereof
  • Room-temperature self-repairing polyurethane based on multiple self-repairing units and preparation method thereof

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preparation example Construction

[0037] The invention provides a preparation method of polyurethane self-repairing at room temperature based on multiple self-repairing units, comprising the following steps:

[0038] 1) mixing polytetrahydrofuran, 5-(2-hydroxyethyl)-6-methyl-2-aminouracil, and a solvent, and carrying out a dehumidification and impurity removal reaction to obtain a first mixture;

[0039] 2) mixing the first mixture, diisocyanate and a catalyst, and carrying out a catalytic reaction to obtain an isocyanate-terminated prepolymer;

[0040] 3) react after mixing the isocyanate-terminated prepolymer, 2,2-bis-methylolpropionic acid and diol to obtain a linear isocyanate-terminated polymer;

[0041] 4) mixing the linear isocyanate-terminated polymer with dihydroxy borate, and reacting to obtain a second mixture;

[0042] 5) The second mixture and the hydrophilic agent are mixed and reacted, and then end-capping, phase inversion, and curing reactions are performed in sequence to obtain a polyurethane f...

Embodiment 1

[0076] Preparation of 5-(2-hydroxyethyl)-6-methyl-2-aminouracil:

[0077] 1) 2-amino-4-hydroxy-6-methylpyrimidine (40mmol) and hexamethylene diisocyanate (240mmol) were reacted at 100°C for 20h, the reaction product was washed three times with solvent petroleum ether and then placed in an oven at 60°C Dry for 2h, and grind 3 times during this period;

[0078] 2) Dissolve the product (50 mmol) obtained in step 1) and 2-amino-1,3-propanediol (63.7 mmol) in solvent N,N-dimethylformamide, react at 100° C. for 2 h, add petroleum ether and ethyl acetate. 100 mL of mixed solution of ester (the molar ratio of petroleum ether and ethyl acetate is 1:1) precipitates the product, and then washes with acetone for 2 to 3 times after suction filtration. Take out the grind and keep it sealed.

Embodiment 2

[0080] Preparation of dihydroxyborate:

[0081] Terephthalic diboronic acid (25 mmol) and 1,2,6-hexanetriol (55 mmol) were dissolved in 100 mL of tetrahydrofuran, and anhydrous magnesium sulfate (10 g) was added to remove the water produced by the reaction. After reacting at room temperature for 24 h, filter, Finally, the filtrate was washed twice with n-hexane to obtain dihydroxyborate.

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Abstract

The invention belongs to the technical field of self-repairing polyurethane materials, and discloses room-temperature self-repairing polyurethane based on multiple self-repairing units and a preparation method of the room-temperature self-repairing polyurethane. According to the invention, multiple hydrogen bonds and boric acid ester bonds are introduced to synthesize polyurethane capable of self-repairing at room temperature under assistance of water. According to the polyurethane, the synergistic effect of various dynamic bonds is utilized, firstly, an inherent dynamic hydrogen bond system in a polyurethane system is contained, secondly, dynamic coordination bonds and multiple hydrogen bonds are formed through nitrogen and boron coordination, the obtained material has good mechanical performance, and meanwhile, the borate bonds endow the material with the room-temperature self-repairing performance under the action of water. The preparation technology is simple, the cost is low, and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of self-healing polyurethane materials, in particular to a room-temperature self-repairing polyurethane based on multiple self-repairing units and a preparation method thereof. Background technique [0002] Polyurethane appeared in the 1930s. After nearly 80 years of technological development, this material has been widely used in the field of home furnishing, construction, daily necessities, transportation, and home appliances. During the use of materials, damage and micro-cracks will inevitably occur, which will cause macro-cracks and macro-fractures to bury potential safety hazards. Realizing the self-healing of materials can effectively eliminate hidden dangers and prolong the service life of materials. Self-healing is to imitate the principle of biological damage healing. Through energy or material supply, small damages of materials can be self-healed. The preparation of polyurethane elastomers with hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/12C08G18/66C08G18/48C08G18/34C08G18/32C08L75/08C08J5/18
CPCC08G18/12C08G18/6692C08G18/4854C08G18/3848C08J5/18C08J2375/08C08G18/348C08G18/3897C08G18/3206
Inventor 邓煜东闫磊
Owner 江苏富琪森新材料有限公司
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