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Post-treatment method of polyimide moulding powder

A technology of polyimide and molding powder, which is applied in the field of polymer material preparation, can solve the problems of consuming a lot of manpower, material resources, financial resources, waste of energy and processing costs, and difficult to achieve, so as to reduce the cost of post-processing procedures and improve thermal efficiency. Effects of stability and simplification of processing steps

Active Publication Date: 2018-02-09
潍坊弘润新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wastewater contains a large amount of ethanol or methanol or acetone, unreacted raw materials in the reaction system (such as diamine, dianhydride, entrainer, end-capping agent, etc.) The composition is more complicated
If the detergents such as ethanol, methanol or acetone in the wastewater are recovered, due to the complex composition of the wastewater, it is difficult to separate and obtain pure ethanol, methanol or propanol, and it is difficult to recycle them as detergents
Moreover, the components of wastewater are complex, and it is difficult to separate and recycle each component one by one. Therefore, it will not only consume a lot of manpower, material resources, and financial resources to treat these wastewater, but also inevitably waste energy.
Therefore, the traditional washing method has the problems of difficult wastewater treatment, waste of energy and high treatment cost.
[0004] In addition, the thermal stability of traditional polyimide molding powder is not good. For example, the 5% thermal weight loss temperature is generally below 550°C, and it is difficult to reach 560°C or above, which restricts the use of polyimide in certain high-temperature environments. Applications
[0005] To sum up, in the prior art, the thermal stability of polyimide molding powder is poor, and a large amount of waste water is generated during the post-processing process to increase the cost of post-processing, and there is still a lack of effective solutions.

Method used

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  • Post-treatment method of polyimide moulding powder

Examples

Experimental program
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Effect test

Embodiment 1

[0047] 20g of p-phenylenediamine was dissolved in 200ml of N,N-dimethylformamide solvent, nitrogen gas was continuously passed through, and stirred for 2 hours.

[0048]25 g of pyromellitic dianhydride monomers were added to the above solution in batches, with an interval of 1 hour between each addition, and reacted at room temperature for 3 hours after addition.

[0049] 5 g of phthalic dianhydride was added to the above solution, and stirred at room temperature for 2 hours.

[0050] 5 g of toluene was added to the above solution, and after stirring for 2 hours, the temperature was raised to 180° C., and the reaction was carried out for 3 hours.

[0051] The above solution was naturally cooled, filtered with suction, and washed with N,N-dimethylformamide for several times. The washed solvent and filtrate are distilled to recycle the solvent and toluene.

[0052] The above materials were dried at 80° C. for 6 hours, and vacuum-dried for 3 hours. Finally get the product. Fr...

Embodiment 2

[0054] 30 g of m-phenylenediamine was dissolved in 400 ml of N,N-dimethylformamide as a solvent, nitrogen gas was continuously passed through, and stirred for 2 hours.

[0055] 35g of biphenyltetracarboxylic dianhydride monomer was added to the above solution in batches, the interval between each addition was 1 hour, and the reaction was carried out at room temperature for 3 hours after addition.

[0056] Add 8 g of norbornene anhydride to the above solution, and stir at room temperature for 2 hours.

[0057] 3 g of xylene was added to the above solution, and after stirring for 2 hours, the temperature was raised to 180° C. and reacted for 3 hours.

[0058] The above solution was naturally cooled, filtered with suction, and washed with N,N-dimethylformamide for several times. The washed solvent and filtrate are distilled to recycle the solvent and xylene.

[0059] The above materials were dried at 80° C. for 6 hours, and vacuum-dried for 3 hours. Finally, the product was ob...

Embodiment 3

[0061] Dissolve 50g of 4,4′-diaminodiphenylether in 800ml of N,N-dimethylacetamide solvent, continuously feed nitrogen, and stir for 2 hours.

[0062] 60 g of diphenylmethanol tetra-acid dianhydride was added to the above solution in batches, the interval between each addition was 1 hour, and the reaction was carried out at room temperature for 3 hours after addition.

[0063] 7 g of maleic anhydride was added to the above solution and stirred at room temperature for 2 hours.

[0064] Add 8 g of triethylamine into the above solution, stir for 2 hours, then raise the temperature to 160° C., and react for 3 hours.

[0065] The above solution was naturally cooled, filtered with suction, and washed several times with N,N-dimethylacetamide. The solvent and filtrate after washing are distilled to recycle the solvent and triethylamine.

[0066] The above materials were dried at 80° C. for 6 hours, and vacuum-dried for 3 hours to finally obtain the product. The 5% thermal weight los...

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Abstract

The invention discloses a post-treatment method of polyimide moulding powder. The method comprises the following steps of filtering a reaction system of reacted polyimide moulding powder, washing through an organic solvent in the polyimide moulding powder reaction system during filtering, and drying to obtain the polyimide moulding powder. When the organic solvent used in a polyimide preparation system is used as washing liquid, washing waste water can be recycled for synthesizing polyimide if only an entrainer in the washing waste water is simply removed. A treatment process of the washing waste water is greatly simplified, the post-treatment process cost of the polyimide moulding powder is reduced, and meanwhile, the heat stability of the polyimide moulding powder can be also improved.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, and in particular relates to a post-treatment method of polyimide molding powder. Background technique [0002] Polyimide, abbreviated as PI, is a polymer whose main chain contains imido groups (─C─N─C─). It is widely used in the aerospace industry, nuclear power technology and other high temperature resistant fields. For example, it can be used as the preparation material for aircraft painting engine parts, gears for deceleration transmission, shaft sleeves for mechanical parts and sealing gaskets. At present, the number of polyimide products is increasing at an annual rate of 8%. [0003] At present, in the production process of polyimide molding powder, the prepared polyimide molding powder is generally washed with organic solvents such as methanol or acetone, or alternately washed with the above organic solvents and a large amount of water, A large amount of waste water is produc...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08G73/12
CPCC08G73/1007C08G73/1032C08G73/1042C08G73/1067C08G73/12C08G73/124
Inventor 曲延涛陈世伟张范赵汝臣朱文聪
Owner 潍坊弘润新材料有限公司
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