Oil-resistant sealant and its preparation method

A sealant and oil-resistant technology, applied in the field of oil-resistant sealants and their preparation, can solve the problems of poor air tightness and water tightness, poor oil resistance, low bonding strength, etc., and achieve low air permeability and stable product dimensions. Good performance and excellent water tightness

Active Publication Date: 2014-05-14
四川泛华航空仪表电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When ordinary rubber seals products, although it has waterproof, dustproof protection, high elasticity and toughness, its bonding strength is low, its oil resistance is not strong, and there are many bubbles after curing, and its airtightness and watertightness are not strong. It is used for devices soaked in oil for a long time, which is easy to age and crack

Method used

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  • Oil-resistant sealant and its preparation method
  • Oil-resistant sealant and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In an environment with a temperature of 20±5°C and a humidity of 70% to 80%, weigh the weight of isocyanate and epoxy resin carrier, dibutyltin dilaurate or triethylenediamine as the catalyst according to any specific value in the above weight percentage The percentage content is used to prepare the sealant. The specific method can be, weigh 10wt% of E-51 epoxy resin, 67wt% of liquid JLY-121 polysulfide rubber, and 20wt% of polymethyl polyphenyl diisocyanate; then put the above-mentioned weighed raw materials in a glass container In a medium, such as a beaker, stir well with a glass rod, drop 3wt% of dibutyltin dilaurate or triethylenediamine, stir well again, and place it in the same room temperature environment for 5min.

Embodiment 2

[0025] In an environment with a temperature of 20±5°C and a humidity of 70% to 80%, put the epoxy resin, liquid polysulfide rubber, and isocyanate into a glass container according to the components specified in Table 1, and stir well with a glass rod. Then add the catalyst dropwise, stir well again, and place it under the same normal temperature environment for 5 minutes to make a sealant composition.

Embodiment 3

[0027] The method of Experimental Example 2 was repeated at the contents of each combination specified in Table 1, but dibutyltin dilaurate was replaced with triethylenediamine.

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Abstract

The invention brings forward an oil-resistant sealant, which at least contains a liquid polysulfide rubber, isocyanate and an epoxy resin carrier and is prepared by using dibutyltin dilaurate or triethylenediamine as a catalyst. A preparation method of the oil-resistant sealant comprises the following steps of: a) weighing ingredients: respectively weighing the epoxy resin, the liquid polysulfide rubber and isocyanate by a balance and placing the ingredients into a crucible; b) stirring: fully and uniformly stirring by using a glass rod; c) adding a catalyst: dropping dibutyltin dilaurate, and fully and uniformly stirring; d) standing: standing at normal temperature for 5 min. The technological method provided by the invention is simple and can be used to remarkably improve the product's oil resistance, insulating properties, air tightness and water tightness. By the adoption of the preparation method, defects of rubber sealants in the prior art such as low adhesive strength, poor oil resistance and many bubbles after solidification is avoided, and the problem that a sealant which is immersed in oil for a long time is easy to age and crack is solved.

Description

technical field [0001] The invention relates to an oil-resistant sealant and a preparation method thereof, in particular to a sealant used for sealing products soaked in oil for a long time. Background technique [0002] In the prior art, devices immersed in oil for a long time, especially device packaging and fixing devices immersed in oil, are usually potted with a sealant with high oil resistance. The sealants currently used to seal such products are generally rubber adhesives. The adhesive is mainly a bonding liquid prepared by dissolving rubber mix and an appropriate amount of synthetic resin in an organic solvent. Its bonding liquid is a non-structural adhesive composed of one-component and two-component. When ordinary rubber seals products, although it has waterproof, dustproof protection, high elasticity and toughness, its bonding strength is low, its oil resistance is not strong, and there are many bubbles after curing, and its airtightness and watertightness are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/10C09J181/04C09J163/00C09J11/06
Inventor 陈小东郝琼
Owner 四川泛华航空仪表电器有限公司
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