Method for manufacturing flocculant of modified polyacrylamide for concrete keeping together underwater

A polyacrylamide and acrylamide technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of insufficient anti-dispersion performance of underwater concrete mixture, large loss of hardened concrete strength, and reduced slump loss, etc. To achieve the effect of excellent anti-dispersion, excellent filling and reducing water consumption

Inactive Publication Date: 2005-03-02
BC P INC CHINA NAT PETROLEUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing flocculants for underwater non-dispersible concrete use cellulose-based flocculants, polysaccharide polymer-based flocculants, or polyacrylamide flocculants. The disadvantage is the anti-dispersion performance of underwater concrete mixtures. Insufficient, poor fluidity, large slump loss, large strength loss of hardened concrete due to material dispersion
Existing polyacrylamide flocculants are produced by the polymerization of acrylamide monomers into linear or homopolymeric polyacrylamide flocculants, and the anti-dispersion and fluidity of underwater concrete mixtures need to be improved. Losses to be further reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Manufacturing method-1 of the modified polyacrylamide flocculant for underwater non-dispersible concrete of the present invention. Add 1 part by weight of acrylamide monomer to a polyethylene plastic bag, dissolve 0.15 parts by weight of solid polyvinyl alcohol with 1 part by weight of deionized water in advance, then add it, and then add 3 parts by weight of deionized water. The mixture was heated to 30°C, nitrogen gas was passed into the plastic bag for 15 minutes, and then 0.01 parts by weight of hydrogen peroxide and 0.01 parts by weight of ferrous sulfate, a ferrous ion compound, were added into the plastic bag to carry out polymerization reaction. After 6 hours of polymerization, the obtained propylene The amide-polyvinyl alcohol copolymer is granulated, dried and crushed to make acrylamide-polyvinyl alcohol copolymer powder, which is the modified polyacrylamide flocculant-1.

Embodiment 2

[0020] The manufacturing method-2 of the modified polyacrylamide flocculant for underwater non-dispersible concrete of the present invention. In the acrylamide-polyvinyl alcohol copolymer powder made by the same manufacturing method as in Example 1, 2 parts by weight of naphthalenesulfonic acid formaldehyde condensate powder are mixed by 1 part by weight to make a modified polyacrylamide flocculant- 2.

Embodiment 3

[0022] Manufacturing method-3 of the modified polyacrylamide flocculant for underwater non-dispersible concrete of the present invention. Add 1 part by weight of acrylamide monomer into a polyethylene plastic bag, then add 0.15 parts by weight of polyvinyl alcohol dissolved in 1 part by weight of deionized water in advance, then add 3 parts by weight of deionized water, and heat it to 30°C. After 15 minutes of nitrogen gas flow, 0.01 weight part of ceric amine nitrate dissolved in 0.1 weight part of nitric acid was added for polymerization reaction. After 6 hours of reaction, the obtained acrylamide-polyvinyl alcohol copolymer was granulated, dried and pulverized to produce Acrylamide-polyvinyl alcohol copolymer powder, that is, modified polyacrylamide flocculant-3.

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PUM

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Abstract

A modified polyacrylamide flocculant for the concrete which is not dispersed in water, that is, underwater poured concrete is prepared from acrylamide, polyvinyl alcohol, N2, hydrogen peroxide and ferrous sulfate through polymerizing to obtain acrylamide-polyvinyl alcohol copolymer, and selectively mixing it with formaldehyde naphthalenesulfonate.

Description

technical field [0001] The invention relates to a modified polyacrylamide flocculant for underwater non-dispersible concrete and a manufacturing method thereof, which are used for underwater pouring concrete engineering. Background technique [0002] The existing flocculants for underwater non-dispersible concrete use cellulose-based flocculants, polysaccharide polymer-based flocculants, or polyacrylamide flocculants. The disadvantage is the anti-dispersion performance of underwater concrete mixtures. Insufficient, poor fluidity, large slump loss, and large strength loss of hardened concrete due to material dispersion. Existing polyacrylamide flocculants are produced by the polymerization of acrylamide monomers into linear or homopolymeric polyacrylamide flocculants, and the anti-dispersion and fluidity of underwater concrete mixtures need to be improved. Losses need to be further reduced. Contents of the invention [0003] The object of the present invention is to avoid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C08F261/04
Inventor 林鲜许海彬冯士明张长民周伟丁新龙冯爱丽
Owner BC P INC CHINA NAT PETROLEUM CORP
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