Concrete admixture and preparing method thereof
An admixture and concrete-like technology, which is applied in the field of concrete admixtures, can solve the problems of raising costs, increasing the risk of quality problems, increasing the uncertainty of concrete engineering, etc., achieving significant progress, good initial performance and performance over time, The effect of good retarding and slump performance
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[0022] In the first aspect, the present invention provides a polycarboxylate concrete admixture and a preparation method thereof, comprising the following steps:
[0023] (1) Unsaturated alcohol polyethers, such as isopentenyl polyoxyethylene ether, isobutenyl polyoxyethylene ether, acryl polyoxyethylene ether, etc., the above-mentioned unsaturated polyoxyethylene ethers have different molecular weights, which are different from unsaturated carboxyl polyoxyethylene ethers. Mix acid compounds, such as acrylic acid, methacrylic acid, and itaconic acid, heat up to 50°C~70°C under mechanical stirring, add initiator, and drop chain transfer agent for 30min~120min.
[0024] (2) Mix the polyethers with different molecular weights and unsaturated alcohol polyethers prepared in step (1). The above polyethers with different molecular weights and unsaturated alcohol polyethers should involve two or three oligomers with different molecular weights. Under stirring conditions, add initiator...
Embodiment 1
[0027] Put 1200g of isopentenyl polyoxyethylene ether with a molecular weight of 1200 and 100g of acrylic acid into the reaction device, raise the temperature to 55°C under mechanical stirring, add 15g of ammonium persulfate as an initiator, and drop 5.0g of mercaptoacetic acid as a chain transfer agent, the dropping time is 60min, and the prepared product is oligomer A; 1800g of isopentenyl polyoxyethylene ether with a molecular weight of 3600 and 50g of acrylic acid are put into the reaction device, the temperature is raised to 55°C under mechanical stirring, and the 20g of ammonium persulfate was used as an initiator, thioglycolic acid was added dropwise as a chain transfer agent, and the dropping time was 60min, and the prepared product was oligomer B.
[0028] Mix 250g of oligomer A prepared above and 750g of oligomer B above, under mechanical stirring, add 12g of ammonium persulfate as an initiator, add 60g of acrylic acid dropwise at a constant speed, and the reaction te...
Embodiment 2
[0030] Put 1200g of isobutylene polyoxyethylene ether with a molecular weight of 1200 and 100g of acrylic acid into the reaction device, heat up to 60°C under mechanical stirring, add 20g of sodium persulfate as an initiator, and dropwise add 5.0g of mercaptoacetic acid as a chain transfer agent. The dropping time is 75min, and the prepared product is oligomer A; put 1800g of propylene polyoxyethylene ether with a molecular weight of 3600 and 50g of acrylic acid into the reaction device, raise the temperature to 70°C under mechanical stirring, and add 25g of sodium persulfate As an initiator, mercaptoacetic acid was added dropwise as a chain transfer agent for 90 minutes, and the prepared product was oligomer B.
[0031] Mix 500 g of oligomer A prepared above and 500 g of oligomer B above, and add 20 g of ammonium persulfate as an initiator under mechanical stirring, and add 65 g of methacrylic acid dropwise at a constant speed, and the reaction temperature is 60°C. After the ...
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