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Room temperature vulcanized dual-component polythioether sealant, preparation method and application method thereof

A room temperature vulcanization, two-component technology, applied in the field of materials, can solve the problems of loss of mechanical properties and aging resistance of sealant materials, easy fracture, poor heat resistance of sealants, etc., to improve mechanical properties and mechanical properties. Improve and meet the effect of long life requirements

Active Publication Date: 2016-03-09
BAIMTEC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of existing lightweight sealant materials is usually achieved by adding a high fraction of low-density fillers to liquid polysulfide rubber, but when the amount of low-density fillers added is high, the mechanical properties of the vulcanized sealant materials Significant loss of performance and aging resistance, unable to meet the long-life requirements of aircraft seals, it is necessary to add reinforcing fillers with excellent reinforcing effects
At the same time, because the polysulfide rubber molecular chain contains a large number of disulfide bonds, it is easy to break under high temperature conditions, resulting in poor heat resistance of the sealant

Method used

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  • Room temperature vulcanized dual-component polythioether sealant, preparation method and application method thereof
  • Room temperature vulcanized dual-component polythioether sealant, preparation method and application method thereof
  • Room temperature vulcanized dual-component polythioether sealant, preparation method and application method thereof

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preparation example Construction

[0023] The preparation method of the room temperature vulcanization two-component polysulfide sealant as described above is characterized in that the steps of preparation are as follows:

[0024] 1. Dealing with low-density packing:

[0025] 1.1. Pickling: Soak the low-density filler in 8% to 12% sulfuric acid aqueous solution and stir for at least 4 hours, then wash with deionized water until the pH value is neutral, and dry in an oven;

[0026] 1.2. Surface treatment: Dissolve the silane coupling agent in absolute ethanol to obtain a silane coupling agent solution with a concentration of 1% to 10%, add low-density fillers into the silane coupling agent solution, and stir for at least 1 hour , the low-density filler is separated from the silane coupling agent solution by filtration, and the low-density filler is dried in an oven;

[0027] 2. Prepare component A:

[0028] 2.1. Weigh various raw materials in proportion;

[0029] 2.2. Ultrasonic dispersion: Put the mercapto-t...

Embodiment 1

[0035] 1. Formula composition

[0036]

[0037]

[0038] 2. Preparation:

[0039] 2.1. Dealing with low-density packing:

[0040] 2.1.1 Pickling: Soak the low-density filler in 8% sulfuric acid aqueous solution and stir for 5 hours, then wash with deionized water until the pH value is neutral, and dry in an oven;

[0041] 2.1.2. Surface treatment: Dissolve the silane coupling agent in absolute ethanol to obtain a silane coupling agent solution with a concentration of 5%, add low-density fillers into the silane coupling agent solution, and stir for 1.5 hours. Separate the low-density filler from the silane coupling agent solution by filtering, and put the low-density filler into an oven to dry;

[0042] 2.2. Prepare component A:

[0043] 2.2.1. Weigh various raw materials in proportion;

[0044] 2.2.2. Ultrasonic dispersion: Put the mercapto-terminated liquid polysulfide rubber into the ultrasonic dispersion equipment, add lamellar filler, and perform ultrasonic dispe...

Embodiment 2

[0053] 1. Formula composition:

[0054]

[0055] 2. Preparation:

[0056] 2.1. Dealing with low-density packing:

[0057] 2.1.1 Pickling: Soak the low-density filler in 10% sulfuric acid aqueous solution and stir for 4.5 hours, then wash with deionized water until the pH value is neutral, and dry in an oven;

[0058] 2.1.2. Surface treatment: Dissolve the silane coupling agent in absolute ethanol to obtain a silane coupling agent solution with a concentration of 5%, add low-density fillers into the silane coupling agent solution, stir for 1 hour, pass Filter to separate the low-density filler from the silane coupling agent solution, and dry the low-density filler in an oven;

[0059] 2.2. Prepare component A:

[0060] 2.2.1. Weigh various raw materials in proportion;

[0061] 2.2.2. Ultrasonic dispersion: Put the mercapto-terminated liquid polysulfide rubber into the ultrasonic dispersion equipment, add lamellar filler, and perform ultrasonic dispersion for 8 hours to o...

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Abstract

The invention belongs to the technical field of materials, and relates to a room temperature vulcanized dual-component polythioether sealant, a preparation method and application method thereof. The sealant is characterized by being composed of a component (A) and a component (B) according to a weight ratio of 8:1-10:1. The preparation method comprises the following steps: processing a low-density filling material, preparing the component (A), and preparing the component (B). The invention provides a room temperature vulcanized dual-component polythioether sealant, a preparation method and application method thereof. The density of the sealant is lower than 1.30 g / cm3. At the same time, the mechanical properties, anti-aging performance, and heatproof performance of the sealant are all improved. The requirement on the service life of sealant in airplane sealing is met.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a two-component polysulfide sealant vulcanized at room temperature and its preparation and use methods. Background technique [0002] With the development of the aviation industry, aircraft weight reduction is an eternal theme in the design and manufacture of aircraft. As one of the largest non-metallic functional materials used in aircraft, aerospace sealant materials have great potential for weight reduction. Aviation sealants are widely used in the sealing of integral fuel tanks, fuselages, cockpits, and flaps. The amount used for each aircraft ranges from several hundred kilograms to one thousand kilograms, and its weight reduction is of great significance. At present, most of the reports on lightweight aviation sealants are based on liquid polysulfide rubber, which has good oil resistance, low air permeability, weather resistance and chemical medium resistance, impact resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J181/02C09J11/04C09J11/06C09J11/08C09K3/10
Inventor 全燕南吴松华章谏正
Owner BAIMTEC MATERIAL CO LTD