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Preparation method for polysulfide polyurethane (urea) with self-repairing function

A self-repairing technology of polythiourethane, which is applied in the preparation of polythiourethane and in the field of polyurethane materials, can solve problems such as low tensile strength and limited application range, and achieve improved reactivity, reduced interference, and controllable and moderate reaction speed Effect

Active Publication Date: 2018-10-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Summary of existing literature and published patent analysis and research: the tensile strength of polysulfide polymers with self-healing function is low, the maximum is only about 1MPa, which limits the scope of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of polysulfide polyurethane (urea): (1) prepolymer synthesis: 100 parts by weight, liquid polysulfide rubber with a molecular weight of 4000, 12.5 parts by weight 2,2'-diaminodiphenyl disulfide and 0.1 parts by weight of 2 , 4,6-tris(dimethylaminomethyl)phenol, stirred and reacted at 120° C. for 6 hours under nitrogen protection, and cooled to obtain aniline-modified liquid polysulfide. (2) Curing: 15.5 g parts by weight of toluene-2,4-diisocyanate and 60 parts by weight of xylene were added to 100 parts by weight of aniline-modified liquid polysulfide, mixed evenly, degassed, and cured at room temperature for 7 days.

[0023] Main properties of the prepared polythiourethane (urea): tensile strength 8.4 MPa; elongation at break 380%. The cut samples were contacted with each other at 120° C. for 4-8 hours, and the tensile strength recovered to 5.9-7.3 MPa, and the recovery rate was 70-87%.

Embodiment 2

[0025] Preparation of polysulfide polyurethane (urea): (1) prepolymer synthesis: 100 parts by weight molecular weight is 4000 liquid polysulfide rubber, 18.75 parts by weight 2,2'-diaminodiphenyl disulfide and 0.1 part by weight triethylamine , under the protection of nitrogen, stirred and reacted at 100°C for 10 hours, and cooled to obtain aniline-modified liquid polysulfide. (2) Curing: Add 18 parts by weight toluene-2,4-diisocyanate and 4 parts by weight isophorone diisocyanate, 20 parts by weight xylene and 30 parts by weight N to 100 parts by weight of aniline-modified liquid polysulfide , N-dimethylformamide, degas after mixing evenly, cure at room temperature for 1 day + 50°C for 3 days.

[0026] Main properties of the prepared polythiourethane (urea): tensile strength 11.4MPa; elongation at break 340%. The cut samples were contacted with each other at 120°C for 4-8 hours, the tensile strength recovered to 6.7-7.2 MPa, and the recovery rate was 59-63%.

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Abstract

The invention discloses a preparation method for polysulfide polyurethane (urea) with a self-repairing function. The preparation method comprises the steps that prepolymer synthesis is carried out, specifically, mercapta-terminated liquid polysulfide rubber and 2,2'-aminophenyl disulfide are mixed and are heated for reaction under an alkaline condition so as to obtain anilino-modified liquid polysulfide; and curing is carried out, specifically, curing reaction is carried out on the anilino-modified liquid polysulfide and isocyanate so as to prepare polysulfide polyurethane (urea) with the self-repairing function. The preparation method has the advantages that the reaction activity of the liquid polysulfide rubber and isocyanate is effectively improved, and water vapor interference in the preparation process is reduced; 2,2'-aminophenyl disulfide contains benzene rings, and the hard segment and the mechanical strength of a material of polyurethane (urea) are effectively regulated and controlled by adding different amounts; and the tensile strength of the prepared polysulfide polyurethane (urea) is greater than or equal to 8 MPa, the elongation at break is 300-500%, cut samples makecontact with each other for 4-8 hours at 100-130 DEG C, and the repair rate is 55-90%.

Description

technical field [0001] The invention relates to a preparation method of polysulfide polyurethane (urea) with self-repairing function, belonging to the field of polyurethane materials and technologies. Background technique [0002] As we all know, polysulfide has excellent properties such as low temperature resistance, oxidation resistance, ultraviolet radiation resistance and chemical corrosion resistance, and is an ideal material for bonding and sealing; at the same time, the main chain of polysulfide contains rich disulfide covalent bonds, inter-segment sulfur sulfur Interchange interactions can endow polysulfide polymers with self-healing properties. Since self-healing materials can independently repair the physical damage of materials caused by environmental fatigue and mechanical fatigue, thereby prolonging the service life of materials, the preparation of polysulfide polymers with self-healing functions has attracted the interest of researchers. [0003] Involving pol...

Claims

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Application Information

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IPC IPC(8): C08G18/64
CPCC08G18/6453
Inventor 全一武高文通
Owner NANJING UNIV
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