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Preparation method for surface-modified polyacrylic acid microspheres

A polyacrylic acid microsphere and surface modification technology, which is applied in the field of polysulfide sealants, can solve the problems of affecting product performance, poor dispersion, easy agglomeration of acrylic microspheres, etc., and achieve stable product performance, reduce viscosity, and enhance mechanical properties. Effect

Inactive Publication Date: 2016-01-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that acrylic acid microspheres are easy to agglomerate and have poor dispersion during application, thus affecting product performance

Method used

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  • Preparation method for surface-modified polyacrylic acid microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 100 g of dry polyacrylic acid microspheres and put them into the reaction kettle, and heat the reaction kettle to 60° C., start the stirring device, and stir at a low speed for about 10 minutes. Another 35g modifier 2-ethyl-7-hydroxyl-5-thiepine was weighed and placed in a burette, the stirring speed was adjusted to medium speed and the modifier was added dropwise to the reaction kettle, and the dropping rate was controlled to be about 18 drops / minute. After the dropwise addition, continue to stir at constant temperature for 3 hours, then remove the heating device, cool to room temperature, and keep stirring during the cooling process.

[0038] Weigh 30g of dimercaptoethyl sulfide and 700g of xylene and mix them thoroughly, add them to the stirring tank and stir and mix for 10min, and weigh 10g of pentamethyldiethylenetriamine, 5g of bicyclic imidazole and 100g of xylene, mix them fully and place them in a burette During the process, control the rate of addition...

Embodiment 2

[0040] Weigh 100 g of dry polyacrylic acid microspheres and put them into the reaction kettle, and heat the reaction kettle to 60° C., start the stirring device, and stir at a low speed for about 10 minutes. Another 45g modifier 9-hydroxy-7-thianonene was weighed and placed in a burette, the stirring speed was adjusted to medium speed and the modifier was added dropwise into the reaction kettle, and the dropping rate was controlled to be about 20 drops / min. After the dropwise addition, continue to stir at constant temperature for 3 hours, then remove the heating device, cool to room temperature, and keep stirring during the cooling process.

[0041] Weigh 30g of dimercaptoethyl sulfide, 400g of ethanol, and 350g of ethyl acetate, mix them thoroughly, add them into the stirring tank and stir and mix for 10min, and weigh 8g of 2,4,6-tris(dimethylaminomethyl)phenol, 7g of bicyclic Mix imidazole and 100g xylene thoroughly and put it in a burette, control the dropping rate to about...

Embodiment 3

[0044] Weigh 100 g of dry polyacrylic acid microspheres and put them into the reaction kettle, and heat the reaction kettle to 60° C., start the stirring device, and stir at a low speed for about 10 minutes. Another 45g modifier 2-chloro-7-hydroxyl-5-thiepine was weighed and placed in a burette, the stirring speed was adjusted to medium speed and the modifier was added dropwise to the reaction kettle, and the dropping rate was controlled to be about 20 drops / minute. After the dropwise addition, continue to stir at constant temperature for 3 hours, then remove the heating device, cool to room temperature, and keep stirring during the cooling process.

[0045]Weigh 30g of dimercaptoethyl sulfide, 400g of ethanol, and 350g of ethyl acetate, mix them thoroughly, add them into a stirring tank and stir and mix for 10min, and weigh 8g of 2,4,6-tris(dimethylaminomethyl)phenol, 3g of dimethicone Ethylamine and 100g of xylene were thoroughly mixed and placed in a burette, the rate of ...

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Abstract

The invention relates to a surface modification method for powder, in particular to a surface modification method for polyacrylic acid microspheres and a polysulfide sealant containing surface-modified polyacrylic acid microspheres. According to the method, surface treatment is performed on the polyacrylic acid microspheres by adopting a two-step method with hydroxyl-terminated unsaturated monomers and thioether monomers, grafting modification is performed on the surfaces of the polyacrylic acid microspheres to enable the thioether structures to be evenly and stably distributed on the surfaces of the microspheres, therefore, the dispersity of the microspheres in liquid polysulfide rubber is effectively improved, and the viscosity of base adhesives is reduced; meanwhile, in the base adhesive sulfidation process, the thioether structures on the surfaces of the microspheres also have reactive active groups to participate in a sulfuration reaction, therefore, stable chemical bonds are formed between the microspheres and a matrix, connection between the microspheres and the matrix is enhanced, and then the mechanical properties of macroscopic materials are enhanced. In addition, according to the modification method, the needed technology conditions are easy to achieve, the product property is stable, and large-scale production of products is facilitated.

Description

technical field [0001] The invention relates to a method for surface modification of powder, in particular to a method for surface modification of polyacrylic acid microspheres and a polysulfide sealant containing the surface modified polyacrylic acid microspheres. Background technique [0002] Polysulfide sealants are widely used in aircraft fuel tanks, cockpits, windshields, and fuselage wings due to their excellent adhesive properties and good resistance to fuel, fuel vapor, non-polar liquid media, and atmospheric environments. structural sealing. Therefore, by reducing the density of the sealant, the weight of the aircraft can be effectively reduced. [0003] In the low-density sealant, the method of adding hollow microspheres is mainly used to reduce its density. The density decreases significantly with the increase of the hollowness, and the surface contains polar groups (-COOH), so this powder filler is used in sealing. The agent-based paste is easy to aggregate dur...

Claims

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Application Information

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IPC IPC(8): C08F265/02C08F228/04C08F8/34C09J181/04
Inventor 孙超章谏正宋英红秦蓬波吴松华
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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