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A polysulfide sealant with room temperature self-healing properties and high elongation

A polysulfide sealant and self-healing technology, applied in the field of sealants, can solve the problems of unsuitable sealants and low elongation at break, and achieve the effects of easy availability of raw materials, high elongation at break and simple synthesis

Active Publication Date: 2020-04-03
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the elongation at break of the self-healing polysulfide polymer material prepared by the above method is less than 120%, which is lower than that of general-purpose polysulfide sealant, so it is not suitable for use as a sealant

Method used

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  • A polysulfide sealant with room temperature self-healing properties and high elongation
  • A polysulfide sealant with room temperature self-healing properties and high elongation
  • A polysulfide sealant with room temperature self-healing properties and high elongation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Preparation of polysulfide sealant: 100 parts by weight of mercapto-terminated liquid polysulfide rubber, number average molecular weight 4000, 8.5 parts by weight of bisphenol F epoxy resin, 5 parts by weight of benzyl epoxy glycidyl ether modified liquid polysulfide oligomerization Thing, 1 weight part DMP-30 accelerator composition. Curing conditions: 1 day at 75°C.

[0014] Synthesis of liquid polysulfide oligomer modified by benzyl epoxy glycidyl ether: 100 parts by weight of mercapto-terminated liquid polysulfide rubber with a number average molecular weight of 4000, adding 8.2 parts by weight of benzyl epoxy glycidyl ether, stirring evenly, and nitrogen protection React at 70°C for 36 hours, monitor the reactant 2250cm by infrared spectroscopy -1 The mercapto group content at the place drops below 0.5%, and the liquid polysulfide oligomer modified by benzyl epoxy glycidyl ether is obtained by cooling.

[0015] Sample mechanical properties: tensile strength 0.65...

Embodiment 2

[0017] Preparation of polysulfide sealant: 100 parts by weight of mercapto-terminated liquid polysulfide rubber, number average molecular weight 4000, 7.3 parts by weight of bisphenol A epoxy resin and 2 parts by weight of cyclohexane-1,2-dicarboxylic acid diglycidyl ester, 6 parts by weight of phenyl epoxy glycidyl ether modified liquid polysulfide oligomer, and 1.5 parts by weight of DMP-30 accelerator. Curing conditions: curing at 50°C for 2 days.

[0018] The synthesis of the liquid polysulfide oligomer modified by phenyl epoxy glycidyl ether: 100 parts by weight of mercapto-terminated liquid polysulfide rubber, number average molecular weight 1000, adding 16.4 parts by weight of phenyl epoxy glycidyl ether, stirring evenly, nitrogen protection After reacting at 80°C for 24 hours, the intensity of the sulfhydryl absorption peak of the reactant was monitored by infrared spectroscopy, and the liquid polysulfide oligomer modified by phenyl epoxy glycidyl ether was obtained by...

Embodiment 3

[0021] Preparation of polysulfide sealant: 50 parts by weight of mercapto-terminated liquid polysulfide rubber, number average molecular weight 2500, 50 parts by weight of mercapto-terminated liquid polysulfide rubber, number average molecular weight 4000, 5 parts by weight of bisphenol A type epoxy resin and 6 parts by weight It consists of two parts of bisphenol F epoxy resin, 3 parts by weight of o-cresyl epoxy glycidyl ether modified liquid polysulfide oligomer, and 2 parts by weight of DMP-30 accelerator. Curing conditions: 14 days at room temperature.

[0022] Synthesis of the liquid polysulfide oligomer modified by o-cresyl epoxy glycidyl ether: 100 parts by weight of mercapto-terminated liquid polysulfide rubber with a number average molecular weight of 4000, adding 7.5 parts by weight of o-cresyl epoxy glycidyl ether, stirring at room temperature , reacted at 60°C for 48 hours under the protection of nitrogen, and monitored the reactant 2250cm by infrared spectroscopy...

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Abstract

The invention relates to a polysulfide sealant with room-temperature self-repairability and high elongation percentage. The polysulfide sealant is prepared from the ingredients in parts by weight: 100 parts of mercapto-terminated liquid polysulfide rubber with the number-average molecular weight of 2,500 to 7,000, 5-15 parts of epoxy resin, 2-8 parts of aromatic epoxy glycidyl ether modified liquid polysulfide oligomer and 0.05-5 parts of 2,4,6-tri-(dimethylaminomethyl)phenol, wherein curing conditions are as follows: carrying out uniform mixing, and carrying out room-temperature curing for 14 days or curing for 2 days at the temperature of 50 DEG C or curing for 1 day at the temperature of 75 DEG C. The polysulfide sealant has the tensile strength of 0.5Mpa to 1MPa after being cured and has the elongation percentage at break of 350% to 800%; after broken sealants are in contact with each other at room temperature and are subjected to self-repairing for 12 to 72 hours, the tensile strength is 0.45MPa to 0.95MPa, and the elongation percentage at break is 320% to 720%, so that the sealant has room-temperature self repairability and room-temperature re-processing recovery performance.

Description

technical field [0001] The invention relates to a polysulfide sealant with self-repairability at room temperature and high elongation, and belongs to the technical field of sealants. Background technique [0002] The sealant prepared with polysulfide rubber as the main base material has good elasticity, water resistance, oxidation resistance, ultraviolet radiation resistance and chemical corrosion resistance, and is widely used in construction and fuel tank sealing. During the long-term use of polysulfide sealant materials, due to the influence of the external environment and mechanical fatigue, micro-cracks and local damage will inevitably occur on the inside and outside of the polysulfide sealant material. Such tiny defects are difficult to detect and repair, and easily form stress concentration points. This leads to a decrease in the overall mechanical properties and a shortened service life. Therefore, the development of polysulfide sealants with self-healing properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J181/04C09J11/08C08G75/14
CPCC08G75/14C08L2205/025C08L2205/03C08L2205/035C09J11/08C09J181/04C08L63/00C08L81/04
Inventor 全一武高文通
Owner NANJING UNIV