Polycarboxylate-type water reducing agent mother liquid, preparation method and application thereof
The technology of polycarboxylic acid series and water reducing agent is applied in the field of admixtures for concrete, which can solve the problems of high sensitivity, easy bleeding and segregation of concrete, complicated production process, etc., and achieves low dosage and improved slump retention effect. , the effect of simple process
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Embodiment 1
[0037] Prepare high water retention and high slump retention type polycarboxylate water reducer according to the following raw material quantity and process, specifically:
[0038] (1) Preparation of high water retention and high slump retention type polycarboxylate superplasticizer mother liquor D-1
[0039] ①Material preparation: add 3.20g of ammonium persulfate to 13g of deionized water, mix well, and use tank A for spare, which is material a; 32.0g of acrylic acid, 1.5g of vinyl acetate, 0.7g of mercaptopropionic acid, add 30g of deionized water, mix Evenly, the B tank is spare, it is the b material;
[0040]②Polymerization: Add 543.5g of deionized water and 355g of prenol polyoxyethylene ether (MW=2400) into a glass reactor equipped with a thermometer and an electric stirrer, stir evenly, raise the temperature to 60±1°C, and add dropwise Material a and material b, material a is added dropwise for 3 hours, material b is added dropwise for 2.5 hours, after the addition of ...
Embodiment 2
[0045] Prepare high water retention and high slump retention type polycarboxylate water reducer according to the following raw material quantity and process, specifically:
[0046] (1) Preparation of high water retention and high slump retention type polycarboxylate superplasticizer mother liquor D-2
[0047] ①Material preparation: Add 3.0g of ammonium persulfate to 13g of deionized water, mix evenly, reserve in tank A, which is material a; add 50.0g of acrylic acid, 0.5g of mercaptopropionic acid, add 30g of deionized water, mix well, reserve in tank B, It is for b material;
[0048] ②Polymerization: Add 543.5g of deionized water and 340g of methallyl alcohol polyoxyethylene ether (MW=2200) into a glass reactor equipped with a thermometer and an electric stirrer, stir evenly, raise the temperature to 60±1°C, and drop Add material a and material b, add material a dropwise for 3 hours, add material b dropwise for 2.5 hours, continue the reaction for 3 hours after adding materi...
Embodiment 3
[0052] Prepare high water retention and high slump retention type polycarboxylate water reducer according to the following raw material quantity and process, specifically:
[0053] (1) Preparation of high water retention and high slump retention type polycarboxylate superplasticizer mother liquor D-3
[0054] ①Material preparation: Add 2.80g of ammonium persulfate to 13g of deionized water, mix evenly, reserve in tank A, which is material a; add 37.0g of acrylic acid, 0.45g of mercaptopropionic acid, add 30g of deionized water, mix well, reserve in tank B, It is for b material;
[0055] ②Polymerization: Add 543.5g of deionized water and 350g of prenol polyoxyethylene ether (MW=2400) into a glass reactor equipped with a thermometer and an electric stirrer, stir evenly, raise the temperature to 60±1°C, and add dropwise Material a and material b, material a is added dropwise for 3 hours, material b is added dropwise for 2.5 hours, after the addition of material a is completed, t...
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