Modified polycarboxylate superplasticizer 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: 2022-03-25
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
Method used
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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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The invention provides a modified polycarboxylate superplasticizer and a preparation method thereof, and the preparation method comprises the following steps: reacting 2-naphthol-3, 6-disulfonic acid with polyether to obtain modified polyether; the preparation method comprises the following steps: adding modified polyether into water, uniformly dissolving, adding an oxidizing agent, uniformly stirring, adding sodium hypophosphite, uniformly mixing to obtain a solution A, uniformly mixing unsaturated carboxylic acid and a reducing agent, adding water, uniformly mixing to obtain a solution B, dropwise adding the solution B into the solution A, and preserving heat after dropwise adding. The modified polycarboxylic acid water reducing agent provided by the invention has relatively strong adjustability, a TC type polycarboxylic acid water reducing agent is synthesized by modifying the basic comb-shaped structure of the polycarboxylic acid water reducing agent, and the modified polycarboxylic acid water reducing agent has lasting water locking property and mud resistance, does not reduce the dispersing performance, and effectively makes up the defect that the traditional polycarboxylic acid water reducing agent is 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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Patent Timeline
Login to View More 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