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A kind of preparation method of nano-silicon carbide modified curing agent water glass

A nano-silicon carbide and curing agent technology, applied in the direction of silicon carbide, carbide, etc., can solve the problems of insufficient strength, high viscosity coefficient of water glass, poor collapsibility, etc., and achieve simple preparation steps, high viscosity coefficient and low cost. Effect

Active Publication Date: 2018-03-30
WUXI HUHUANG PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to solve the problems that the strength of water glass sand is not high enough after hardening, and more water glass needs to be added, but the addition of water glass results in poor collapse of the sand mold after pouring, difficulty in casting cleaning and regeneration of old sand , provides a method for preparing a curing agent by using nano-silicon carbide modified water glass. The water glass prepared by the present invention has a high viscosity coefficient, so that the phenomenon of poor collapsibility between sand and gravel will not occur. At the same time, the addition of modified water glass, It will also improve the strength and other properties of water glass sand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First select 105g of polydimethylsilane and place it in a 500mL three-necked flask, then protect it with nitrogen gas and place it at 420°C for thermal decomposition and rearrangement reaction. After the reaction is completed, collect the rearrangement product polysilocarbosilane; Add 25g of Fe(AcAc) 3 Place in a three-necked flask, then slowly add 45g of the above-prepared polysilocarbosilane to Fe(AcAc) 3 Above, replace the air with high-purity nitrogen, under the protection of nitrogen, let it slowly heat up and mix the reactants evenly, heat up to 500°C at a speed of 5°C / min, and then heat for 6 hours; wait for the heat preservation to complete Finally, stop heating and cool to 30°C, then add 100mL of xylene to dissolve, after the stirring and dissolving is completed, filter it with suction and collect the filtrate, and distill under reduced pressure for 20min to prepare the precursor solution; :10, isooctyl polyoxyethylene ether is added in the precursor solution,...

example 2

[0021] First select 100g of polydimethylsilane and place it in a 500mL three-necked flask, then protect it with nitrogen gas and place it at 400°C for thermal decomposition and rearrangement reaction. After the reaction is completed, collect the rearrangement product polysilocarbosilane; Add 20g of Fe(AcAc) 3 Place in a three-necked flask, and slowly add 40 g of the above-prepared polysilocarbosilane to Fe(AcAc) 3 Above, replace the air with high-purity nitrogen, under the protection of nitrogen, let it slowly heat up and mix the reactants evenly, heat up to 480°C at a speed of 5°C / min, and then heat for 5 hours; wait for the heat preservation to complete Finally, stop heating and cool to 20°C, then add 100mL of xylene to dissolve, after the stirring and dissolving is completed, filter it with suction and collect the filtrate, and distill under reduced pressure for 10min to prepare the precursor solution; :10, isooctyl polyoxyethylene ether is added in the precursor solution,...

example 3

[0024]First select 102g of polydimethylsilane and put it in a 500mL three-necked flask, then protect it with nitrogen gas and place it at 410°C for thermal decomposition and rearrangement reaction. After the reaction is completed, collect the rearrangement product polysilocarbosilane; Add 22g of Fe(AcAc) 3 Place in a three-necked flask, then slowly add 42g of the above-prepared polysilocarbosilane to Fe(AcAc) 3 Above, replace the air with high-purity nitrogen, under the protection of nitrogen, let it slowly heat up and mix the reactants evenly, heat up to 490°C at a speed of 5°C / min, and then heat for 5 hours; wait for the heat preservation to complete Finally, stop heating and cool to 25°C, then add 100mL of xylene to dissolve, after the stirring and dissolving is completed, filter it with suction and collect the filtrate, and distill under reduced pressure for 15min to prepare the precursor solution; :10, isooctyl polyoxyethylene ether is added in the precursor solution, th...

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Abstract

The invention relates to a method for preparing water glass for a nano silicon carbide modified curing agent, and belongs to the field of curing agent preparation. The method comprises the steps that polydimethylsilane is firstly subjected to a thermal decomposition rearrangement reaction, and rearrangement product polysilacarbosilane is collected; then Fe(AcAc)3 is put into a three-neck flask, polysilacarbosilane is added to the upper portion of Fe(AcAc)3, air is replaced with high-purity nitrogen, heating is carried out for temperature rise, heat preservation and cooling are carried out, xylene is added, suction filtration is carried out, filter liquor is collected, reduced pressure distillation is carried out, then isooctyl polyoxyethylene ether is added to the flask, the flask is put into an electrostatic spinning device, precursor fiber collection is carried out on the electrostatic spinning device, high-temperature pyrolysis and cooling are carried out, and silicon carbide nano particles are collected; the silicon carbide nano particles are put into water glass to be stirred, power-on treatment is carried out, and cooling, stirring and ageing are carried out. The method has the advantages that the coefficient of viscosity of the water glass is high, and the collapsibility among gravel cannot be poor; meanwhile, due to the fact that the modified water glass is added, the strength and other properties of water glass sand are improved.

Description

technical field [0001] The invention relates to a method for preparing nano silicon carbide modified curing agent water glass, belonging to the field of curing agent preparation. Background technique [0002] Water glass, commonly known as sodium silicate, is a water-soluble silicate, and its aqueous solution, commonly known as water glass, is a mineral binder. Its chemical formula is R 2 O nSiO 2 , where R 2 O is an alkali metal oxide, and n is the ratio of silicon dioxide to the number of moles of alkali metal oxide, which is called the mole number of water glass. Sodium silicate (Na 2 O nSiO 2 ) in aqueous solution. [0003] Water glass sand blown into CO 2 When the gas is hardened, the surface layer of water glass absorbs CO 2 And its modulus increases and dehydration, under the double action of acidification and dehydration, it hardens rapidly to form the initial strength. The solidified surface water glass blocks the CO 2 Penetrating into the deep layer, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/97C04B22/08C04B22/00
CPCC04B40/0039C04B22/08C04B22/00
Inventor 周美君汤国平费明魏永牟志锋丁小芳
Owner WUXI HUHUANG PAINT
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