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A kind of preparation method of free formaldehyde and storage stable carving white powder

A technology of free formaldehyde and white powder, applied in the chemical industry, can solve the problems of poor stability and high content of white powder, and achieve the effect of lowering the reaction temperature, shortening the reaction time, and making the process simple and feasible

Active Publication Date: 2021-01-19
湖南中翔化学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method to solve the problems of high reaction temperature in the synthesis process of the current diaobai powder, high content of free formaldehyde in the commercial diaobai powder, and poor stability in the storage process. Adding ultrasound to reduce the reaction temperature, uniformly mixing polyphenolic compounds and silica gel in the Diaobai powder solution to achieve no free formaldehyde in the commercial Diaobai powder and stable storage

Method used

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  • A kind of preparation method of free formaldehyde and storage stable carving white powder
  • A kind of preparation method of free formaldehyde and storage stable carving white powder

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preparation example Construction

[0017] A kind of preparation method of free formaldehyde and storage stable carving white powder of the present invention is characterized in that the steps are as follows:

[0018] (1) One-step synthesis of sodium bisulfite formaldehyde: 80-120 g of sodium metabisulfite (Na 2 S 2 o 5 ) was dissolved in 200ml of ice water under ultrasonic conditions of 200 to 800W and stirred at a speed of 500 to 10000r / min, then 80 to 120g of zinc powder (Zn) was added to the above-mentioned sodium metabisulfite ice water bath and the temperature was raised to 20 to 30°C and kept for 5 to 20min, add 5~20g catalysts (the mixture of graphene oxide and cetyltrimethylammonium bromide mass ratio 1:1) to above-mentioned system again, finally add 45~75ml 50% formaldehyde in above-mentioned system ( CH 2 (0) solution, warming up to 60-80° C. for 0.5-1 h, washing and suction-filtering the reacted product, and the obtained washing solution is sodium bisulfite formaldehyde solution.

[0019] (2) Pre...

Embodiment 1

[0021] The preparation method of the free formaldehyde-free and storage-stable Diaobai powder of this embodiment, the steps are as follows:

[0022] (1) One-step synthesis of sodium sulfoxylate formaldehyde: 80g sodium metabisulfite (Na 2 S 2 o 5 ) dissolved in 200ml of ice water under 200W ultrasonic conditions and stirred at a speed of 500r / min, then added 100g of zinc powder (Zn) to the above-mentioned sodium metabisulfite ice-water bath and raised the temperature to 20°C for 10min, then added 5g of catalyst to the above system (graphene oxide and cetyltrimethylammonium bromide mass ratio 1:1 mixture), finally add 55ml 50% formaldehyde (CH 2 (0) solution, be warming up to 60~80 ℃ of insulation 0.5h, the product after reaction is washed, suction filtration, and the lotion obtained is sodium bisulfite formaldehyde solution;

[0023] (2) Preparation of free formaldehyde-free and storage-stable diabolite powder: add 1g polyphenolic compound epicatechin and 5g desiccant montm...

Embodiment 2

[0025] The preparation method of the free formaldehyde-free and storage-stable Diaobai powder of this embodiment, the steps are as follows:

[0026] (1) One-step synthesis of sodium sulfoxylate formaldehyde: 120g sodium metabisulfite (Na 2 S 2 o 5 ) dissolved in 200ml of ice water under 800W ultrasonic conditions and stirred at a speed of 10000r / min, then added 120g of zinc powder (Zn) to the above-mentioned sodium metabisulfite ice-water bath and raised the temperature to 30°C for 20min, then added 20g of catalyst to the above system (graphene oxide and cetyltrimethylammonium bromide mass ratio 1:1 mixture), finally add 75ml 50% formaldehyde (CH 2 (0) solution, be warming up to 70 ℃ of insulation 1h, the product after reaction is washed, suction filtration, and the lotion obtained is sodium bisulfite formaldehyde solution;

[0027] (2) Preparation of free formaldehyde-free and storage-stable carving white powder: add 2g polyphenols compound catechin and 8g desiccant nanopa...

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Abstract

The invention discloses a preparation method of rongalite having no free formaldehyde and capable of being stably stored. The preparation method comprises the following steps: under an ultrasonic stirring condition, adding sodium metabisulfite, zinc powder, a catalyst and formaldehyde into a reaction system in sequence, so as to obtain a sodium hydrosulfite formaldehyde solution; then adding a polyphenol compound and a drying agent into the solution to obtain a sodium hydrosulfite formaldehyde stable storage solution which is uniformly mixed; finally, concentrating and drying the solution to obtain the rongalite having no free formaldehyde and capable of being stably stored. According to the preparation method, sodium hydrosulfite formaldehyde is prepared by adopting a one-step ultrasonicmethod, and the rongalite powder having no free formaldehyde and capable of being stably stored is obtained through adding the polyphenol compound and silica gel. The rongalite powder having no free formaldehyde and capable of being stably stored is prepared through a one-step low-temperature method; reaction temperature and reaction time for preparing the sodium hydrosulfite formaldehyde are reduced, the energy consumption and time are saved, the production efficiency is improved and the production cost is reduced; the prepared rongalite has no free formaldehyde and the storage stability is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of free formaldehyde-free and storage-stable carving white powder. Background technique [0002] The chemical name of dibasic powder is sodium formaldehyde sulfoxylate dihydrate. It is used as a dye discharge agent in the printing and dyeing industry and as a reducing agent in the rubber industry. Two methods are currently used in industry: zinc powder-pyroxia-formaldehyde method (referred to as one-step method) and zinc powder-sulfur dioxide-formaldehyde method (referred to as three-step method). In recent years, the one-step production of carving white powder has been widely used, but in the one-step production process, it needs to continue to react at a temperature close to 100°C for several hours, which consumes a lot of energy; and the biggest problem with the current commercial carving white powder It contains more free formaldehy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C313/04
CPCC07C313/04
Inventor 宋伟明戴志坚颜建勋易辉
Owner 湖南中翔化学科技有限公司