Hysteresis heat generation accelerated vulcanization sealant

A technology for accelerated vulcanization and sealant, applied in the direction of adhesive additives, non-polymer adhesive additives, adhesives, etc. Precise temperature control, improve heating efficiency, and improve the effect of assembly efficiency

Pending Publication Date: 2021-12-17
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material used is generally carbon fiber or untreated general magnetic particles. Such particles only provide induction heating and the induction temperature cannot be adjusted. It is difficult to control the heating rate and heating temperature in practice.
At the same time, due to its large amount of addition, the hardness of the material system will increase significantly, and the mechanical properties will decrease, especially the decrease in elongation at break is more obvious, which is not conducive to the deformation requirements of the material and cannot meet the sealing requirements of the airborne sealant.

Method used

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  • Hysteresis heat generation accelerated vulcanization sealant

Examples

Experimental program
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preparation example Construction

[0027]Preparation of the base paste: Weigh 100 parts of mercapto-terminated liquid rubber, 0-20 parts of filler, and 10-100 parts of magnetic nanomaterials according to the ratio of parts by mass, put them into a mixer and stir them in a vacuum and mix them at a speed of 500-800 Stir for 30-60 minutes at rpm, then add plasticizer, vulcanization accelerator and adhesion promoter according to the ratio of parts by mass, wherein the adhesion promoter is epoxy silane coupling agent and amino titanate coupling agent Equivalent molar ratio of reactants at 40-60°C for 2-4 hours. Then vacuumize and stir at 500-800 rpm for 30-60 minutes to obtain the base paste component.

[0028] Preparation of vulcanizing agent: Weigh 100 parts of manganese dioxide or epoxy resin, 0 to 100 parts of plasticizer, 0 to 10 parts of vulcanization inhibitor, and 0 to 20 parts of filler, and grind on a three-roll mill 4-6 times or vacuumize and stir in a mixer at a speed of 500-800 rpm for 30-60 minutes to...

Embodiment 1

[0031] The hysteresis heat generation accelerated vulcanization sealant in this embodiment is formulated in the following parts by mass.

[0032] Base paste: 100 parts of thiol-terminated polythioether rubber (average molecular weight 10,000, mercapto group content 0.5%), 100 parts of nano-NdFeB magnetic powder treated with KH590 silane coupling agent, Curie temperature 80°C, DMP30 accelerator 5 2 parts, 2 parts of adhesion promoter, among which the adhesion promoter is 3-glycidyl ether oxypropylmethyl trimethoxysilane (brand name KH560) and new alkoxy tris (ethylenediamine N ethoxy) titanium Ester (trade name TCA-L97) reacted at 40°C for 4 hours in equimolar ratio;

[0033] Vulcanizing agent: 50 parts of E44 epoxy resin, 50 parts of F44 epoxy resin, 50 parts of dibutyl phthalate, 20 parts of nano calcium carbonate.

[0034] Preparation method of base paste:

[0035] Weigh 100 parts of mercapto-terminated polythioether with an average molecular weight of 10,000 and a mercapt...

Embodiment 2

[0040] The hysteresis heat generation accelerated vulcanization sealant in this embodiment is formulated in the following parts by mass.

[0041] Base paste: 20 parts of mercapto-terminated butyl rubber (average molecular weight 1000, mercapto content 7%), 80 parts of liquid polysulfide rubber (average molecular weight 5000, mercapto content 1.5%), 5 parts of fumed silica (filler white carbon black , can improve mechanical properties), 10 parts each of nano-NdFeB magnetic powder, ferric oxide nanowires, iron-cobalt alloy nanoparticles treated with Si69 silane coupling agent, 1 part of diphenylguanidine, 4 parts of adhesion promoter, Among them, the adhesion promoter is 3-glycidyl ether oxypropylmethyl dimethoxysilane (the brand is KBM402) and neoalkoxy tris (p-aminophenoxy) titanate (the brand is TCA-L44), etc. The molar ratio is the product reacted at 60°C for 2h;

[0042] Vulcanizing agent: 100 parts of manganese dioxide, 100 parts of dibutyl phthalate, 2 parts of stearic a...

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Abstract

The invention belongs to the technical field of sealing materials, and relates to a hysteresis heat generation accelerated vulcanization sealant. The sealant is formed by mixing two components, namely base paste and a vulcanizing agent, and the mass ratio of the base paste to the vulcanizing agent is 100:(8-12); and the base paste comprises the components in parts by weight: 100 parts of sulfydryl-terminated liquid rubber, 0-20 parts of filler, 10-100 parts of a magnetic nano material, 1-4 parts of an adhesion promoter, 0-5 parts of a vulcanization accelerator and 0-10 parts of a plasticizer, and the magnetic nano material is an alloy or an alloy oxide with the Curie temperature not exceeding 100 DEG C and a mixture of the alloy or the alloy oxide. According to the sealant, heat generated in an alternating magnetic field can be utilized to achieve local rapid heating so as to promote accelerated vulcanization of the sealant, the assembly efficiency is effectively improved, meanwhile, accurate temperature control can be achieved, the tensile strength performance of the material is high, and the onboard use requirement can be effectively met.

Description

technical field [0001] The invention belongs to the technical field of sealing materials and relates to a hysteresis heat generation accelerated vulcanization sealant. Background technique [0002] Polysulfide-based sealants are widely used in the sealing of transportation, bridge construction and other fields due to their good air-tightness and oil-tightness properties. In particular, they have excellent fuel resistance and are ideal sealing materials for aircraft fuel tanks. The vulcanization of this type of sealant mainly relies on the reaction of the terminal mercapto groups of liquid rubber with vulcanizing agents such as metal oxide epoxy resins to form elastomers. This reaction can be carried out normally at room temperature, but the reaction process is greatly affected by the ambient temperature and humidity, and the reaction proceeds slowly under the condition of low temperature and low humidity, resulting in a higher degree of product requirements for the construct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J181/02C09J181/04C09J163/02C09J115/00C09J175/04C09J11/06C09J11/04
CPCC09J181/02C09J181/04C09J175/04C09J11/06C09J11/04C08K2003/2272C08K2201/01C08K2201/011C08L63/00C08K9/06C08K3/08C08K3/02C08K5/544C08L15/00C08K7/08C08K9/10C08K9/04C08K7/18C08K3/22
Inventor 鲍传磊吴松华高元峰章谏正
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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