A kind of preparation method of crack self-healing fast response additive for concrete
A fast-response, additive technology, applied in the field of building materials, can solve the problems of secondary damage, slow healing, easy to be attacked by harmful ions, liquid erosion, etc., and achieve the effect of good durability
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Embodiment 1
[0025] The preparation method of the crack self-healing rapid response additive in the above, comprising the steps:
[0026] 1) Add 15.8 acrylic acid to the beaker, and add 106 parts of NaOH solution with a concentration of 2.5 wt% for neutralization, and the neutralization degree is 60%. Add 0.25 parts of cross-linking agent and 0.2 parts of initiator, stir with an electromagnetic stirrer at 500 r / min until the solution is clear, pass nitrogen into the beaker to discharge the air, and heat in a sealed water bath for 3 hours until the viscosity of the reaction system increases. The reactant is cooled and then cut, put into a blast drying oven at a temperature of 70-80° C. for drying, and then granulated to obtain 90 μm SAP powder.
[0027] 2) Dissolve the aldehyde-soluble phenolic resin and ethanol according to the ratio of 1:10, stir evenly, use the spray drying method, spray in hot nitrogen, and dry, so that the aldehyde solution evaporates rapidly, and the phenolic resin is...
Embodiment 2
[0029] The preparation method of the crack self-healing rapid response additive in the above, comprising the steps:
[0030] 1) Add 25 parts of acrylic acid to the beaker, and add 185 parts of NaOH solution with a concentration of 2.5wt% for neutralization, and the degree of neutralization is 70%. Add 0.58 parts of cross-linking agent and 0.61 parts of initiator, stir at 500 r / min with an electromagnetic stirrer until the solution is clear, pass nitrogen into the beaker to discharge the air, and heat in a sealed water bath for 2 hours until the viscosity of the reaction system increases. The reactant is cooled and then cut, put into a blast drying oven at a temperature of 70-80° C. for drying, and then granulated to obtain 90 μm SAP powder.
[0031] 2) Dissolve the aldehyde-soluble phenolic resin and ethanol according to the ratio of 1:15, stir evenly, use the spray drying method, spray in hot nitrogen, and dry, so that the aldehyde solution evaporates rapidly, and the phenoli...
Embodiment 3
[0033] The preparation method of the crack self-healing rapid response additive in the above, comprising the steps:
[0034] 1) Add 25 parts of acrylic acid to the beaker, and add 185 parts of NaOH solution with a concentration of 2.5wt% for neutralization, and the degree of neutralization is 70%. Add 0.58 parts of cross-linking agent and 0.61 parts of initiator, stir at 500 r / min with an electromagnetic stirrer until the solution is clear, pass nitrogen into the beaker to discharge the air, and heat in a sealed water bath for 2 hours until the viscosity of the reaction system increases. The reactant is cooled and then cut, put into a blast drying oven at a temperature of 70-80° C. for drying, and then granulated to obtain 90 μm SAP powder.
[0035] 2) Dissolve the aldehyde-soluble phenolic resin and ethanol according to the ratio of 1:20, stir evenly, use the spray drying method, spray in hot nitrogen, and dry, so that the aldehyde solution evaporates rapidly, and the phenoli...
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