Preparation of vinyl aromatic polyether grafting concrete superplasticiser

Abstract

The invention discloses a method for preparing vinyl aromatic line polyether graft concrete superplasticizer which is prepared by using the following steps: (1) esterification: catalytic esterification is carried out to chemtura alkyl diol monoalkyl ether and maleic anhydride for obtaining an esterification product; (2) copolymerization: under the action of initiator, the esterification product, vinyl aromatic monomer and vinyl acetate are copolymerized for obtaining a polymerization product; (3) sulfonation reaction: under the action of sulfonation reagent, two sections of sulfonation reaction (low-temperature and high-temperature sulfonation) are carried out to the polymerization product for obtaining a sulfonation product; and (4) neutral reaction: the pH value of the sulfonation product is adjusted to be 7-8, and then diluted by water for obtaining the concrete superplasticizer with certain concentration. The invention can adjust product performance by controlling the product structure, does not use solvent in the process of reaction, is non-toxic and non-polluting, is safe to the environment, and has stable product performance, better security and water reducing property.

Description

technical field

[0001] The invention relates to a concrete superplasticizer, in particular to a preparation method of a vinyl aromatic polyether grafted concrete superplasticizer. Background technique

[0002] When preparing concrete, the amount ratio of water and cement (water-cement ratio) is a contradiction. The total amount of cementitious materials in high performance concrete is large, so the water demand will increase. On the other hand, in order to improve compactness and strength, the water-cement ratio must be reduced. The consequences of increasing the amount of cement and reducing the water-cement ratio are to increase the viscosity of the concrete and deteriorate the rheology. At present, the most effective and realistic way to solve the above contradictions is to add a superplasticizer. Superplasticizer can increase the fluidity of cement slurry without significantly affecting the air content, and can improve the workability when the water-cement ratio remai...

Examples

Embodiment 1

[0031] Under nitrogen protection, add 60.00 g of polyethylene glycol monomethyl ether with a molecular weight of 600, 10.00 g of maleic anhydride, and 0.05 g of 2,6-di-tert-butyl-p-cresol into the reactor, stir and heat, and raise the temperature to 60 At ℃, 1.80 g of sulfuric acid was added. Continue to heat up to 80°C, and react at this temperature for 2 hours to obtain an esterified product. In the reactor containing the esterification product, add 10.00 g of styrene, 0.50 g of vinyl acetate, and 0.40 g of dibenzoyl peroxide as an initiator. After reacting at 80°C for 4 hours, a copolymerized product was obtained.

[0032] Add 0.20 g of dehydrating agent phosphorus pentoxide to the copolymerized product, and stir for 15 minutes to disperse the dehydrating agent evenly. At 80°C, 10.00 g of concentrated sulfuric acid was added dropwise. After two hours of reaction, the temperature was raised to 120° C., and 40.00 g of acetyl sulfate was added. After continuing to react fo...

Embodiment 2

[0034] Under nitrogen protection, 120.00 g of polypropylene glycol monoethyl ether with a molecular weight of 1200, 60.00 g of maleic anhydride, and 0.30 g of p-phenylenediamine were added to the reactor, stirred and heated, and when the temperature was raised to 60°C, 6.00 g of sulfuric acid was added. Continue to heat up to 90°C, and react at this temperature for 2 hours to obtain an esterified product. In the reactor containing the esterification product, add 60.00 g of 9-vinylanthracene, 2.0 g of vinyl acetate, and 5.40 g of dibenzoyl peroxide as an initiator. After reacting at 90° C. for 3 h, a copolymerized product was obtained.

[0035] Add 1.20 g of dehydrating agent phosphorus pentoxide to the copolymerized product, and stir for 15 minutes to disperse the dehydrating agent evenly. At 80°C, 60.0 g of chlorosulfonic acid was added dropwise. After reacting for two hours, the temperature was raised to 160° C., and 120.00 g of lauroyl sulfate was added. After continuing...

Embodiment 3

[0037]Under the protection of nitrogen, add 100.00 g of polyethylene glycol monoethyl ether with a molecular weight of 1000, 20.00 g of maleic anhydride, and 0.20 g of 2,6-di-tert-butyl-p-cresol. Into the reactor, stir and heat, and raise the temperature to 60 At ℃, 4.00 g of phosphoric acid was added. Continue to heat up to 80°C, and react at this temperature for 3 hours to obtain an esterified product. In the reactor containing the esterification product, add 40.00 g of α-methylstyrene, 4.00 g of vinyl acetate, and 2.40 g of initiator tert-butyl peroxybenzoate. After reacting at 80° C. for 2 h, a copolymerized product was obtained.

[0038] Add 0.80 g of boric anhydride as a dehydrating agent to the copolymerized product, and stir for 15 minutes to disperse the dehydrating agent evenly. At 80°C, 40.00 g of sulfur trioxide was added dropwise. After two hours of reaction, the temperature was raised to 130° C., and 80.00 g of hexanoyl sulfate was added. After continuing the...

technical field

[0001] The invention relates to a concrete superplasticizer, in particular to a preparation method of a vinyl aromatic polyether grafted concrete superplasticizer. Background technique

[0002] When preparing concrete, the amount ratio of water and cement (water-cement ratio) is a contradiction. The total amount of cementitious materials in high performance concrete is large, so the water demand will increase. On the other hand, in order to improve compactness and strength, the water-cement ratio must be reduced. The consequences of increasing the amount of cement and reducing the water-cement ratio are to increase the viscosity of the concrete and deteriorate the rheology. At present, the most effective and realistic way to solve the above contradictions is to add a superplasticizer. Superplasticizer can increase the fluidity of cement slurry without significantly affecting the air content, and can improve the workability when the water-cement ratio remai...

Examples

Embodiment 1

[0031] Under nitrogen protection, add 60.00 g of polyethylene glycol monomethyl ether with a molecular weight of 600, 10.00 g of maleic anhydride, and 0.05 g of 2,6-di-tert-butyl-p-cresol into the reactor, stir and heat, and raise the temperature to 60 At ℃, 1.80 g of sulfuric acid was added. Continue to heat up to 80°C, and react at this temperature for 2 hours to obtain an esterified product. In the reactor containing the esterification product, add 10.00 g of styrene, 0.50 g of vinyl acetate, and 0.40 g of dibenzoyl peroxide as an initiator. After reacting at 80°C for 4 hours, a copolymerized product was obtained.

[0032] Add 0.20 g of dehydrating agent phosphorus pentoxide to the copolymerized product, and stir for 15 minutes to disperse the dehydrating agent evenly. At 80°C, 10.00 g of concentrated sulfuric acid was added dropwise. After two hours of reaction, the temperature was raised to 120° C., and 40.00 g of acetyl sulfate was added. After continuing to react fo...

Embodiment 2

[0034] Under nitrogen protection, 120.00 g of polypropylene glycol monoethyl ether with a molecular weight of 1200, 60.00 g of maleic anhydride, and 0.30 g of p-phenylenediamine were added to the reactor, stirred and heated, and when the temperature was raised to 60°C, 6.00 g of sulfuric acid was added. Continue to heat up to 90°C, and react at this temperature for 2 hours to obtain an esterified product. In the reactor containing the esterification product, add 60.00 g of 9-vinylanthracene, 2.0 g of vinyl acetate, and 5.40 g of dibenzoyl peroxide as an initiator. After reacting at 90° C. for 3 h, a copolymerized product was obtained.

[0035] Add 1.20 g of dehydrating agent phosphorus pentoxide to the copolymerized product, and stir for 15 minutes to disperse the dehydrating agent evenly. At 80°C, 60.0 g of chlorosulfonic acid was added dropwise. After reacting for two hours, the temperature was raised to 160° C., and 120.00 g of lauroyl sulfate was added. After continuing...

Embodiment 3

[0037]Under the protection of nitrogen, add 100.00 g of polyethylene glycol monoethyl ether with a molecular weight of 1000, 20.00 g of maleic anhydride, and 0.20 g of 2,6-di-tert-butyl-p-cresol. Into the reactor, stir and heat, and raise the temperature to 60 At ℃, 4.00 g of phosphoric acid was added. Continue to heat up to 80°C, and react at this temperature for 3 hours to obtain an esterified product. In the reactor containing the esterification product, add 40.00 g of α-methylstyrene, 4.00 g of vinyl acetate, and 2.40 g of initiator tert-butyl peroxybenzoate. After reacting at 80° C. for 2 h, a copolymerized product was obtained.

[0038] Add 0.80 g of boric anhydride as a dehydrating agent to the copolymerized product, and stir for 15 minutes to disperse the dehydrating agent evenly. At 80°C, 40.00 g of sulfur trioxide was added dropwise. After two hours of reaction, the temperature was raised to 130° C., and 80.00 g of hexanoyl sulfate was added. After continuing the...