Modified lignin concrete air entraining agent and preparation method thereof
A concrete and lignin technology, applied in the field of concrete admixtures, can solve the problems of wasting resources and failing to realize high-value utilization of lignin, and achieve the effects of increasing air-entraining capacity, high cost performance, and good adaptability
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[0024] The present invention provides a method for preparing a modified lignin concrete air-entraining agent. The specific steps are as follows, and the following parts are all parts by mass:
[0025] Step 1. Oxidatively degrade lignin. Take 23~33 parts of lignin, 3~3.5 parts of sodium hydroxide, 45~56 parts of water, 1.6~2.3 parts of hydrogen peroxide solution, 1.1~1.6 parts of copper sulfate according to mass parts. In the reactor, mix evenly and react at 85-95°C for 2 to 3 hours to obtain oxidatively degraded lignin.
[0026] Step 2. Sulfite modified lignin and the above-mentioned degraded lignin solution are kept at 80~90℃, 11.3~15.6 parts of formaldehyde solution and 23.6~28.5 parts of sodium metabisulfite are sequentially added, and the reaction is stirred for 4.5~5.5 hours to obtain sulfitation Modified lignin.
[0027] Step three: Preparation of modified lignin air-entraining agent by grafting modified lignin with polyoxyethylene allyl alcohol, adding 21~32 parts of polyoxye...
Embodiment 1
[0040] Step 1. Oxidatively degrade lignin. Take 23 parts of lignin, 3 parts of sodium hydroxide, 45 parts of water, 1.6 parts of hydrogen peroxide solution, and 1.1 parts of copper sulfate in the reactor according to the mass parts, and mix them evenly. It is reacted for 2 hours at ℃ to obtain oxidatively degraded lignin.
[0041] Step 2: The sulfite-modified lignin and the degraded lignin solution are kept at 80° C., 11.3 parts of formaldehyde solution and 23.6 parts of sodium metabisulfite are sequentially added, and the reaction is stirred for 4.5 hours to obtain the sulfite-modified lignin.
[0042] Step 3. Allyl alcohol polyoxyethylene ether grafted modified lignin to prepare modified lignin air-entraining agent, 21 parts of allyl alcohol polyoxyethylene ether were added to the above sulfite modified lignin solution, stirred and heated At 40℃, add 5 parts of buffer solution to adjust the pH of the system to 6.5, while adding 9 parts of horseradish peroxidase solution with mass...
Embodiment 2
[0045] Step 1. Oxidatively degrade lignin. Take 33 parts of lignin, 3.5 parts of sodium hydroxide, 56 parts of water, 2.3 parts of hydrogen peroxide solution, and 1.6 parts of copper sulfate in the reactor according to the mass parts, and mix them evenly. It is reacted for 3 hours at ℃ to obtain oxidatively degraded lignin.
[0046] Step 2: The sulfite-modified lignin and the degraded lignin solution are kept at 90° C., and 15.6 parts of formaldehyde solution and 28.5 parts of sodium metabisulfite are sequentially added, and the reaction is stirred for 5.5 hours to obtain the sulfite-modified lignin.
[0047] Step 3. Allyl alcohol polyoxyethylene ether grafted modified lignin to prepare modified lignin air-entraining agent. Add 32 parts of allyl alcohol polyoxyethylene ether to the above sulfite modified lignin solution, stir and heat At 50°C, add 8 parts of buffer solution to adjust the pH of the system to 7.0, while adding 15 parts of horseradish peroxidase solution with mass fra...
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