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A kind of polycarboxylate water reducing agent and its preparation method and use method

A technology of polycarboxylic acid series and water reducing agent, which is applied in the field of polycarboxylic acid series water reducing agent, can solve the problems of high difficulty in powdering and poor powdering state, and achieves low difficulty in powdering and high powdering rate. , the effect of excellent performance

Active Publication Date: 2020-04-28
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of the existing polycarboxylate water reducer, which are difficult to powder and poor in powder state, and provide a polycarboxylate water reducer and its preparation method and the method of use, the polycarboxylate water reducer has low difficulty in powdering, high powder forming rate and excellent performance, and can be widely used in the field of dry powder mortar

Method used

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  • A kind of polycarboxylate water reducing agent and its preparation method and use method
  • A kind of polycarboxylate water reducing agent and its preparation method and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A kind of preparation method of polycarboxylate water reducer, it comprises the following steps:

[0052] (1) At room temperature and in a stirring state, add solution A and solution B dropwise to the polymerization reactor that has been put into the base material C to carry out the polymerization reaction. The time for the polymerization reaction is to continue the reaction for 45 minutes after adding solution A and solution B dropwise. prevail;

[0053] Wherein, the timing of adding solution B is earlier than that of solution A, the addition rate of solution A is based on the addition of 40 minutes, and the addition of solution B is based on the addition of 50 minutes; the composition of solution A is: acrylic acid, hydroxyethyl acrylate ester, polyethylene glycol diacrylate, L-ascorbic acid, sodium formaldehyde sulfoxylate, mercaptoacetic acid, mercaptopropionic acid and 41 parts of water; the composition in solution B is: ammonium persulfate, sodium persulfate and w...

Embodiment 2～5

[0058] According to the method and steps of Example 1, according to the formula and operating parameters in Table 1, a polycarboxylate water reducer was prepared.

[0059] Table 1

[0060]

[0061]

[0062] The performance testing results of the polycarboxylate water reducers prepared in Examples 2-5 are shown in Table 1. It can be seen from Table 1 that when the polycarboxylate water reducer of the present invention is added to the cement paste in an amount of 0.10% to 0.20% of the weight of the cement, it can make the initial fluidity of the cement paste with a water-cement ratio of 0.29 It is 260-290mm, and the fluidity increases to 290-320mm in 1 hour; when the amount added to the self-leveling mortar is 0.20%-0.40% of the cement weight, the initial fluidity of the self-leveling mortar is 130-140mm, and the fluidity in 15 minutes is 135- 145mm.

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Abstract

The invention discloses a polycarboxylic acid type water reducer as well as a preparation method and a use method thereof. The polycarboxylic acid type water reducer is prepared by a raw material, andthe raw material comprises the following components in parts by weight: 100 parts of polyether DD-524, 7-10 parts of crylic acid, 3-7 parts of polyethylene glycol diacrylate, 0.3-0.6 part of hydrogenperoxide, 0.5-1.0 part of an initiator, 0.15-0.35 part of L-ascorbic acid, 0.1-0.2 part of sodium formaldehyde sulfoxylate, 0.65-1.35 parts of a chain transfer agent, 4-7 parts of a pH regulator and150-170 parts of water; the powdering rate of the polycarboxylic acid type water reducer reaches up to 97 percent or above, and the percentage is mass percentage. The polycarboxylic acid type water reducer is low in powdering difficulty, high in powdering rate and excellent in performance and can be widely applied to the field of dry powder mortar.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer and its preparation method and use method. Background technique [0002] The research on polycarboxylic acid-based high-performance water reducers in my country began in the middle and late 1990s, and its industrial production and application began in the early 21st century, and it has developed rapidly. Polycarboxylate water reducer is a highly branched polymer dispersant obtained by graft polymerization of unsaturated fatty acid and polyoxyethylene ether. High, the concrete slump loss is small and does not cause obvious retardation, the cement adaptability is good, the content of harmful components is low, and it is suitable for the preparation of high-performance concrete. [0003] With the full development of my country's infrastructure construction, the amount of concrete used in railways, highways, bridges and other buildings has greatly increased. At the same time, the production of high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C04B24/26C04B103/30
CPCC04B24/2647C04B2103/302C08F283/065C08F220/281
Inventor 徐军罗琼李亚杰王万林杜辉董建国
Owner SHANGHAI DONGDA CHEM