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One-component polythioether sealant and preparation method thereof

A polythioether and sealant technology, used in adhesives, adhesive additives, polymer adhesive additives, etc., can solve the problems of complex process, non-vulcanization, local vulcanization too fast, etc. The effect of fast drying time and high temperature resistance rating

Active Publication Date: 2022-03-15
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the sealants used in the aviation field are two-component sealants and multi-component sealant products. When using, several components of the sealant need to be fully mixed and then painted. During the mixing process, due to construction On-site conditions are limited, it is difficult to ensure the uniformity of mixing, and even local vulcanization is too fast or local non-vulcanization occurs.
Moreover, for some sealant products with high viscosity, an appropriate amount of solvent must be added to dilute them before painting. The process is extremely complicated and the operation process is not easy to control.

Method used

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  • One-component polythioether sealant and preparation method thereof
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  • One-component polythioether sealant and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0031] A preparation method of a single-component polythioether sealant, the method takes the following steps: put solid polythioether rubber, reinforcing filler, and curing agent on a two-roller open mill in parts by mass in the following table Mix evenly to obtain the rubber material, calender the rubber material into a thin film, chop it and then put it into a ball mill jar, and then add the mass parts of the silane coupling agent, tackifying resin, and mixed solvent shown in the table below to the A silane coupling agent, a tackifying resin and a mixed solvent are added into a ball milling tank to obtain a mixture, and grinding balls are placed in the ball milling tank to perform ball milling on the mixture, and the ball milling time is more than 18 hours.

[0032] Composition parts by mass Solid polythioether rubber 100 copies Reinforcing filler 15~50 copies A silane coupling agent 0.1~5 copies mixed solvent 200~600 copies Harden...

Embodiment 1

[0034] Dissolve 30g of phenolic resin in 70g of dehydrated ethanol to make a 30% ethanol solution by mass, place 100g of zinc oxide in a beaker at 60°C and stir slowly, then spray the phenolic resin solution in 20 times On the zinc oxide surface, keep stirring the zinc oxide powder. The mass of the phenolic resin ethanol solution is 5g each time. After each spraying, it is visually inspected that there is no wet powder, and then the next spraying is carried out. Wherein the structural formula of the phenolic resin is as follows, and the viscosity of the 50% ethanol solution at 20° C. is 0.13 Pa·s.

[0035]

[0036] Then take the raw materials according to the following proportions by mass:

[0037] Solid polythioether rubber 100 parts

[0038] Fumed silica 15 parts

[0039] Curing agent 13 parts

[0040] Mix the above-mentioned raw materials evenly on a two-roll mill to obtain a rubber material, then calender the rubber material into a thin film, chop it, put it into a b...

Embodiment 2

[0045] Dissolve 30g of phenolic resin in 70g of dehydrated ethanol to make a 30% ethanol solution by mass, place 100g of zinc oxide in a beaker at 60°C and stir slowly, then spray the phenolic resin solution in 20 times On the zinc oxide surface, keep stirring the zinc oxide powder. The mass of the phenolic resin ethanol solution is 5g each time. After each spraying, it is visually inspected that there is no wet powder, and then the next spraying is carried out. Wherein the structural formula of the phenolic resin is as follows, and the viscosity of the 50% ethanol solution at 20° C. is 0.13 Pa·s.

[0046]

[0047] Then take the raw materials according to the following proportions by mass:

[0048]

[0049] Mix the above-mentioned raw materials evenly on a two-roll mill to obtain a rubber material, then calender the rubber material into a thin film, chop it, put it into a ball mill jar, and weigh the raw materials according to the following parts by mass and add them to ...

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Abstract

The invention discloses a one-component polythioether sealant and a preparation method thereof, belonging to the technical field of aviation seal materials. The invention is a one-component sealant product, and the polythioether sealant involved has excellent heat resistance and short surface-drying time, and the prepared sealant is a one-component product without additional processing . Compared with the current brushing type sealant, the invention reduces the difficulty of operation and has higher controllability in the construction process.

Description

technical field [0001] The invention belongs to the technical field of aviation sealing materials, and relates to a single-component polythioether sealing agent and a preparation method thereof. [0002] technical background [0003] Polysulfide sealants are widely used in the field of aviation manufacturing due to their good oil resistance, air tightness, weather resistance and chemical medium resistance, and are one of the most important non-metallic materials used in aircraft manufacturing. However, the polysulfide rubber molecular chain contains a large number of disulfide bonds, which are easily broken under high temperature conditions, which limits the heat resistance of the sealant. [0004] Various sealing forms are involved in the aircraft manufacturing process, including fillet seals, mating surface seals, surface seals, etc. Among them, the surface sealing is to apply the sealant to the sealing surface, which has a decisive effect on the appearance and sealing qua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J181/02C09J11/04C09J11/08
CPCC09J181/02C09J11/04C09J11/08C08K2003/2296C08L2201/08C08L63/00C08K13/06C08K9/08C08K3/22C08K7/26C08K3/04
Inventor 孙超吴松华鲍传磊章谏正
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS