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A kind of preparation method of dinitrosodiammine platinum

A technology of nitrosodiammine platinum and dichlorotetraammine platinum, which is applied in the direction of nitrous acid, chemical instruments and methods, ammonium nitrate, etc., can solve the problem of large potassium ion content, unsatisfactory electroplating effect, and the influence of coating stress Major and other issues

Inactive Publication Date: 2011-12-21
陕西瑞科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The P salt prepared by this method has a large potassium ion content and cannot be removed by washing and hot water recrystallization. In the case of high electroplating coating requirements, it has the greatest impact on the stress of the coating, and the electroplating effect is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] a) Preparation of chloroplatinic acid: Weigh a certain amount of metal platinum, put it into a beaker after washing, add an appropriate amount of aqua regia, and heat appropriately to start the reaction. The reaction should be uniformly bubbling in the solution. Stop the reaction and add hydrochloric acid to catch the nitrate until no more brown gas emerges, transfer to a rotary evaporator, concentrate until anhydrous and evaporate, transfer to a beaker and add appropriate amount of water to prepare a chloroplatinic acid solution with a concentration of 200-300g / L.

[0015] b) Synthesis of chloroplatinous acid: hydrazine hydrochloride is used as a reducing agent to reduce chloroplatinic acid to prepare chloroplatinous acid. Add the molar ratio of chloroplatinic acid to hydrazine hydrochloride in a ratio of 1.5-2.5, filter the insoluble matter, and obtain a scarlet chloroplatinous acid solution.

[0016] c) Preparation of platinum dichlorotetraammine: heating the chlorop...

Embodiment 1

[0021] Embodiment 1: Weigh 195g of platinum metal, put it into a beaker after washing, add an appropriate amount of aqua regia, and heat appropriately to start the reaction. It is advisable for the reaction to be uniformly bubbling in the solution. Stop the reaction and add hydrochloric acid to catch the nitrate until brown gas no longer emerges, transfer to a rotary evaporator, concentrate until anhydrous and evaporate, transfer to a beaker and add appropriate amount of water to prepare a 200g / L chloroplatinic acid solution.

[0022] Weigh 52.5g of hydrazine hydrochloride, prepare it as a 35% deionized aqueous solution, and add it dropwise to the above chloroplatinic acid solution to obtain a scarlet chloroplatinous acid solution.

[0023] After heating the chloroplatinous acid solution to boiling, add boiling 10 times the molar amount of ammonia water, heat until the final solution is colorless, evaporate and concentrate, and 345.2 g of white dichlorotetraammine platinum is p...

Embodiment 2

[0025] Embodiment 2: Weigh 390g of platinum metal, put it into a beaker after washing, add an appropriate amount of aqua regia, and heat appropriately to start the reaction. It is advisable for the reaction to be uniformly bubbling in the solution. Stop the reaction and add hydrochloric acid to catch the nitrate until brown gas no longer emerges, transfer to a rotary evaporator, concentrate until anhydrous and evaporate, transfer to a beaker and add appropriate amount of water to prepare a 200g / L chloroplatinic acid solution.

[0026] Weigh 105 g of hydrazine hydrochloride, prepare it as a 35% deionized aqueous solution, and add it dropwise to the above chloroplatinic acid solution to obtain a scarlet chloroplatinous acid solution.

[0027] Heat the chloroplatinous acid solution to boiling and add 10 times the molar amount of boiling ammonia water, heat until the final solution is colorless, evaporate and concentrate, and precipitate 685.3g of white dichlorotetraammine platinum...

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Abstract

The invention discloses a preparation method of noble metal compound dinitrosodiammine platinum [Pt(NH3)2(NO2)2] used in the process of cyanide-free electroplating and platinum plating. Chloroplatinic acid and hydrazine hydrochloride are used as a reducing agent to reduce chloroplatinic acid to chloroplatinous acid, prepare dichlorotetraammonium platinum by a one-pot method, and then react with excess sodium nitrite to obtain dinitrosodiammine platinum. The invention accurately reduces chloroplatinic acid to chloroplatinous acid, and then prepares dichlorotetraammonium platinum by one-pot cooking method, and further reacts with sodium nitrite to prepare P salt, which effectively solves the excessive potassium ion content of P salt in the traditional preparation method The problem. The elemental analysis of the P salt prepared by the invention is basically consistent with the theoretical value, does not contain potassium ions, and the contents of sodium ions and chloride ions are both lower than 50PPM.

Description

Technical field: [0001] The invention relates to a preparation method of noble metal compound dinitrosodiammine platinum [Pt(NH3)2(NO2)2] used in the process of cyanide-free electroplating and platinum plating. Background technique: [0002] Dinitrosodiammine platinum [Pt(NH3)2(NO2)2], commonly known as P salt, is mainly used for platinum plating in cyanide-free electroplating. The resulting coating has high hardness and low resistance and can be welded; the surface of electronic components is plated with platinum . The usual preparation method is: metal platinum aqua regia is dissolved to prepare chloroplatinic acid, chloroplatinic acid and potassium chloride are respectively made into a 10% solution, then the chloroplatinic acid solution is heated, and potassium chloride solution is added under stirring, at this time Potassium chloroplatinate precipitation is generated, and potassium chloroplatinate is made into a paste with water, heated on a sand bath, and 40% sodium ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00C01C1/18C01B21/50
Inventor 蔡万煜
Owner 陕西瑞科新材料股份有限公司
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