Polysulfide sealant microcapsule as well as preparation method and application thereof

A polysulfide sealant and microcapsule technology, which is applied in the field of sealing and anti-corrosion technology, can solve the problems of difficulty in ensuring the quality of gluing and assembly, low assembly efficiency, affecting sealing and corrosion protection, etc. The effect of assembly quality, improving labor efficiency and reducing labor intensity

Inactive Publication Date: 2017-07-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, polysulfide sealants are two-component separate cans, and are coated by wet assembly. Before coating, multiple processes such as glue mixing, glue dipping, assembly, and glue removal are required, which not only consumes time and effort, but also improves assembly efficiency. Low, and the coating effective time and vulcanization time of the sealant must also be considered. If the coating is not completed within the effective coating time, the mixed sealant may be vulcanized, causing unnecessary waste, and even in manual coating. When there is a problem of missing coating or less coating, it is difficult to ensure the quality of sizing and assembly, which will seriously affect the effect of sealing and corrosion protection

Method used

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  • Polysulfide sealant microcapsule as well as preparation method and application thereof
  • Polysulfide sealant microcapsule as well as preparation method and application thereof
  • Polysulfide sealant microcapsule as well as preparation method and application thereof

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[0029] The preparation method of the polysulfide sealant microcapsules in the present invention is a solution in-situ polymerization method. First, the sealant is diluted with a diluent, and then the polysulfide sealant is emulsified and dispersed in the water phase under rapid stirring conditions to form an O / W Add a mixed solution of urea and formaldehyde to the emulsion, adjust the pH value to acidic with dilute acid, and then polymerize at 20-50°C for 6-24 hours under stirring. Capsule; in parts by weight, the reaction monomer comprises the following components:

[0030]

[0031]

Embodiment 1

[0034] First weigh 4g of polysulfide sealant and dilute it with 3ml of acetone, then mix the sealant with 80ml of 1% sodium dodecylbenzenesulfonate solution under stirring at 1000rpm, emulsify and disperse for 1h to form an O / W emulsion . Weigh 1.5g of urea and 3.5g of 37wt.% formaldehyde aqueous solution, add them to the emulsified sealant solution respectively, and continue to stir for 0.5h. After the urea is completely dissolved, adjust the pH value of the solution to about 4 with dilute hydrochloric acid. and 300 rpm under the condition of stirring for 8 hours, the reaction product was washed with distilled water successively, vacuum filtered, and the filter cake was dried at room temperature to obtain microcapsules coated with polysulfide rubber. The surface morphology of the prepared sealant microcapsules is as follows: figure 1 (a).

Embodiment 2

[0036] Weigh 5g of polysulfide sealant, stir and dilute it with 10ml of ethyl acetate, add the sealant dropwise to 80ml of 1% sodium dodecylbenzenesulfonate solution under stirring condition of 800rpm, emulsify and disperse for 1h to form O / W emulsion. Weigh 2.0g and 6.0g of urea in 37wt.,% formaldehyde solution, respectively add them to the emulsified polysulfide sealant solution, and then continue to stir for 0.5h. After the urea is completely dissolved, adjust the pH value of the solution with 0.2M citric acid to Around 4, the temperature of the water bath was raised to 40°C, and the polymerization reaction was carried out at 500 rpm for 12 hours. The product was washed with ethanol, vacuum filtered, and dried under vacuum at room temperature to obtain microcapsules coated with polysulfide rubber. The surface morphology of the prepared sealant microcapsules is as follows: figure 1 (b).

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Abstract

The invention discloses a polysulfide sealant microcapsule as well as a preparation method and application thereof, belonging to the technical field of sealing and corrosion prevention. The preparation method comprises the steps of reacting by virtue of urea and formaldehyde under a low-temperature continuous stirring condition for 6-24 hours by virtue of an in situ polymerization method, and sequentially carrying out distilled water washing, vacuum filtration and room temperature drying on a product, so as to obtain the polysulfide sealant microcapsule. The particle size of the prepared polysulfide sealant microcapsule is 80-150 microns, the microcapsule is of a relatively regular sphere shape, has a relatively rough surface and is good in monodispersity, the coating amount of a sealant is relatively high, and the sealant does not denature after being placed at the room temperature for a long time. The preparation method has the beneficial effects that preparation conditions are mild, the operation is simple, and equipment requirements are low; and the prepared polysulfide sealant microcapsule can be widely applied to pre-coating of sealed screws and rivets and other parts required to be sealed through extrusion and has wide application prospects in the industrial fields of automobiles, aerospace, ships, petrochemical industry, electric instruments and the like.

Description

[0001] Technical field: [0002] The invention relates to the technical field of sealing and anticorrosion, in particular to a polysulfide sealant microcapsule and its preparation method and application. The polysulfide sealant microcapsule is suitable for automobiles, aerospace, ships, machinery manufacturing, petrochemical industry and electrical instruments Sealing, anti-loosening, leak-proof, waterproof and anti-corrosion technologies in industrial fields such as through-hole lock studs, plugs, bolts, screw plugs, high-lock bolts, screws and rivets. [0003] Background technique: [0004] Polysulfide sealant is an elastic sealing material based on liquid polysulfide rubber. After curing, the elastomer has excellent bonding, airtightness and watertightness, oil resistance, solvent resistance, aging resistance and durability, and low temperature flexibility. , Widely used in industrial fields such as construction, automobile, aerospace, shipbuilding, machinery, petrochemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J181/04C09J11/08C09J11/04C09K3/10C08G12/12B01J13/14
CPCB01J13/14C08G12/12C08K2003/2262C08L2205/03C09J11/04C09J11/08C09J181/04C09K3/10C08L61/24C08K3/22
Inventor 杨怀玉王璇金涛王浩伟廖圣智
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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