A kind of modified polycarboxylate water reducing agent and preparation method thereof
A technology of water reducer and polycarboxylate, which is applied in the field of modified polycarboxylate water reducer and its preparation, which can solve the problems of reducing mortar fluidity, accelerating concrete slump loss, and dispersibility without water-locking properties. , to achieve long-lasting anti-mud performance, make up for mud sensitivity, and long-lasting water-locking effects
Active Publication Date: 2022-05-03
天津冶建特种材料有限公司 +1
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Problems solved by technology
However, it still has many shortcomings, such as only having strong dispersion and not having water-locking properties, which makes concrete prone to segregation and bleeding; it is more sensitive to mud in the aggregate, and clay will weaken the cement dispersion of polycarboxylate superplasticizers Reduce the fluidity of mortar and accelerate the slump loss of concrete
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Embodiment 1
[0042] A preparation method of a modified polycarboxylate water reducer, comprising the steps of:
[0043] (1) Polyether modification: react 3g of 2-naphthol-3,6-disulfonic acid with 27g of polyether at 120°C for 2 hours to obtain a modified polyether;
[0044] (2) Synthesis of water reducer: Add 61g of modified polyether to 60g of water to dissolve evenly, add 1.5g of hydrogen peroxide to it and stir evenly, then add 0.2g of sodium hypophosphite to it, mix evenly to obtain liquid A, mix 8g After mixing acrylic acid and 0.15g Vc evenly, add 20g water to it and mix evenly to obtain liquid B, add liquid B dropwise to liquid A for 3 hours, and keep warm for 2 hours after the dropwise addition.
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Abstract
The invention provides a modified polycarboxylate water reducer and a preparation method thereof, comprising the following steps: reacting 2-naphthol-3,6-disulfonic acid with a polyether to obtain a modified polyether; The modified polyether is added into water to dissolve evenly, add oxidant to it and stir evenly, then add sodium hypophosphite to it, mix evenly to obtain A liquid, mix unsaturated carboxylic acid and reducing agent evenly, add water to it After mixing evenly to obtain liquid B, add liquid B dropwise to liquid A, keep warm after the dropwise addition is complete. A modified polycarboxylate water-reducer described in the present invention has strong adjustability, and the basic comb-shaped structure of the polycarboxylate water-reducer is modified to synthesize a TC-type polycarboxylate water-reducer , it has long-lasting water-locking and mud-resistance performance, and does not reduce the dispersion performance, effectively making up for the defect that traditional polycarboxylate superplasticizers are sensitive to mud.
Description
technical field [0001] The invention belongs to the field of water reducers, in particular to a modified polycarboxylate water reducer and a preparation method thereof. Background technique [0002] As a concrete admixture with excellent performance, polycarboxylate superplasticizer has been widely used in our country. It has the advantages of high water reducing rate, good slump retention, low shrinkage, and environmental protection. Therefore, it has widely replaced high-efficiency water reducers represented by naphthalene series in various concrete projects. However, it still has many shortcomings, such as only having strong dispersion and not having water-locking properties, which makes concrete prone to segregation and bleeding; it is more sensitive to mud in the aggregate, and clay will weaken the cement dispersion of polycarboxylate superplasticizers It can reduce the fluidity of mortar and accelerate the slump loss of concrete. Contents of the invention [0003] ...
Claims
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IPC IPC(8): C08F283/06C08F220/06C04B24/16C04B103/30
CPCC08F283/065C04B24/165C04B2103/302C08F220/06
Inventor 王雪敏刘伟吴志刚郭诚樊伟杨雪超
Owner 天津冶建特种材料有限公司