Sodium hypophosphite

About: Sodium hypophosphite is a research topic. Over the lifetime, 1695 publications have been published within this topic receiving 15932 citations.

Method for performing crease-resistant finishing on cotton fabrics

Abstract: The invention relates to a method for performing crease-resistant finishing on cotton fabrics. The method comprises the following steps: 1) putting bleached pure cotton cloth into a mixed solution of malic acid, sodium hypophosphite, stearic acid triethanolamine ester quaternary softening agent and penetrating agent JFC, steeping, rolling and steeping for two times, wherein the residual rate is controlled to be 90-100% and 2) drying, baking, soaping and then drying. The method has the advantages that malic acid is used as a crease-resistant finishing agent, and meanwhile, sodium hypophosphite with a catalytic effect, the nontoxic softening agent and the penetrating agent are added for performing the crease-resistant finishing on the cotton fabrics, so that the crease-resistant effect is guaranteed, the traditional problems of strong crease-resistant finishing capacity and larger abrasive resistance loss are solved and the fabrics are free from yellowing phenomenon; a crease-resistant finishing agent which is prepared at reasonable ratio of malic acid to catalyst to softening agent to penetrating agent is green and environment-friendly, cannot release toxic harmful materials, such as, formaldehyde, and is safe; the production cost is reduced; the method has certain popularization and application values in production.

Examining the effect of electrosynthesis conditions on the Ni-P alloy composition

Abstract: The Ni–P alloys are widely used as catalysts, magnetic and wear resistant materials. Properties of the nickel-phosphorous alloys are defined by the composition. A highly regulated technique to obtain the alloys with specified composition is the electrosynthesis. It is a relevant task to establish dependences of the alloy composition on the process conditions. In the present work we examined the influence of electrolysis parameters on the Ni–P alloy composition, obtained from the methanesulfonate and sulfate electrolytes. It is shown that an increase in the concentration of sodium hypophosphite, acidity and temperature of the electrolyte increases phosphorus content in the alloy. It was established that when carrying out the electrosynthesis under galvanostatic mode, a change in the alloy composition is predetermined by the rate of phosphorus formation. Atomic phosphorus is formed as a result of the course of two reactions. There occurs the electroreduction and disproportionation of hypophosphite-anion involving hydrogen ions. An increase in the concentration of hydrogen ions in the near-electrode layer contributes to an increase in the rate of phosphorus formation and growing phosphorus content in the alloy. That is why the alloys with a higher content of phosphorus are formed at lower pH indices of the electrolyte and at higher temperature. It was established that weak buffer properties of the methanesulfonate electrolyte are responsible for the lowered phosphorus content in the synthesized alloy. High pH index in the near-electrode layer reduces the rate of phosphorus formation. Established regularities might prove very useful when designing new technologies of the Ni–P alloy electrosynthesis of specified composition from the methanesulfonate electrolyte.

Novel environment-friendly alloy catalyzing liquid and preparing method thereof

Abstract: The invention discloses a novel environment-friendly alloy catalyzing liquid and a preparing method thereof. The catalyzing liquid is composed of raw materials including, by weight, 15-27 parts of nickel sulfate, 10-22 parts of sodium acetate, 10-22 parts of sodium citrate, 8-14 parts of sodium phosphate, 10-16 parts of sulfur powder, 4-10 parts of a wetting agent, 2-8 parts of a buffer agent, 6-12 parts of boric acid, 10-16 parts of hydrazine sulfate, 4-10 parts of lactic acid and 40-64 parts of an acid fujiki extract; the nickel sulfate, the sodium acetate, the sodium citrate, the sodium hypophosphite and the sulfur powder are placed into a stirrer to be evenly stirred to obtain mixed powder; the mixed powder is added into the acid fujiki extract to be dissolved to obtain a mixed solution; the boric acid, the hydrazine sulfate and the lactic acid are evenly stirred to obtain a mixture; and the mixture is added into the mixed solution, and then the wetting agent and the buffer agent are added to be evenly stirred to obtain a catalyzing liquid finished product. According to the catalyzing liquid, in the plating layer forming process, the stability is high, the heat treatment temperature is low, a plating layer is thick and more even, the plating layer is high in hardness, high in abrasive resistance and high in alkali resistance and corrosion resistance; and the novel environment-friendly alloy catalyzing liquid has the beneficial effects of being low in production cost, high in efficiency, environment-friendly and nontoxic.

Preparation method of silver powder by using sodium hypophosphite

Abstract: PURPOSE: A preparation method for silver powder is provided to reduce the reduction time and prepare silver powder at the room temperature by employing sodium hypophosphite as the reducing agent. CONSTITUTION: A preparation method for silver powder comprises steps of preparing silver powder precipitate through automatic reaction by adding NaOH and sodium hypophosphite in silver nitrate solution, and obtaining silver powder through filtering, washing, and drying of the silver powder precipitate. The silver nitrate solution comprises silver nitrate and distilled water at the weight ratio of 1:1~1:10. The weight ratio of silver nitrate and NaOH contained in the silver nitrate solution is 1:0.05~1:0.2. The weight ratio of silver nitrate and sodium hypophosphite contained in the silver nitrate solution is 1:0.3~1:3.

Method for preparing THPC-Urea using phosphine

Abstract: The invention discloses a method which prepares THPS-Urea with phosphine; the phosphine is collected from the waste gas generated in the production process of sodium hypophosphite and stored; formaldehyde and sulfuric acid are prepared into aqueous solution based on a molar ratio of 8.05-8.10:1; the aqueous solution is pumped into an absorption tower through a corrosion-resistant pump and then sprayed downward from the top of the tower, while the phosphine stored in a gas tank is pumped into the absorption tower through a gas delivery pump so as to react with the solution at a temperature of 40-50 DEG C for synthesis so as to prepare the THPS aqueous solution; based on a molar ratio of 1.05-1.00:1, the THPS aqueous solution and the urea are reacted and synthesized at a temperature of 60-70 DEG C so as to generate the THPS-Urea. The method of the invention has the advantages that the THPS-Urea can be used as permanent flame retardant for cotton fabrics and has no pollution to the environment. The formaldehyde and the sulfuric acid can thoroughly absorb the phosphine to achieve zero emission of toxic gases.