Room temperature synthetic polyester polyether polycarboxylic acid water-reducing agent and preparation method thereof

A technology for synthesizing polyester polyether and normal temperature, which is applied in the field of synthesizing polyester polyether polycarboxylate water reducer and its preparation at normal temperature, can solve the problems of cement's poor applicability, poor adaptability and complex synthesis, etc. Achieve the effects of good slump protection, small usage, and improvement of environmental pollution

Active Publication Date: 2018-02-02
四川铁科新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, polycarboxylate superplasticizers also have some disadvantages. The applicability of polyether-type water-reducers to cement is not wide, and the adaptability to fly ash, stone powder, and clay is too poor. Polyester-type water-reducers The effect of water reduction and slump preservation is more balanced, but the synthesis is complicated, the cost is high, and high temperature synthesis is required

Method used

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  • Room temperature synthetic polyester polyether polycarboxylic acid water-reducing agent and preparation method thereof
  • Room temperature synthetic polyester polyether polycarboxylic acid water-reducing agent and preparation method thereof
  • Room temperature synthetic polyester polyether polycarboxylic acid water-reducing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] Preparation of 1000kg polycarboxylate superplasticizer as an example

[0040] Prepare polycarboxylate water reducer, its proportioning is calculated according to weight percentage;

[0041] Put 350kg of tap water and 450kg of isobutylene alcohol polyoxyethylene ether into the reaction kettle, stir at room temperature for 2.0h until fully dissolved; configure solution A in the mixing kettle: put in 50kg of tap water, 40kg of methacrylic acid, 1.5kg of mercaptoethanol, and L-ascorbic acid Sodium 0.55g, stir for 30min until uniform.

[0042] Configure solution B in the mixing tank: put in 65kg of tap water, 40kg of polyethylene glycol monomethyl ether acrylate, and stir for 30 minutes until uniform.

[0043] Put 3 kg of ammonium persulfate into the reaction kettle, stir for 15 minutes, and at the same time, drop solutions A and B into the reaction kettle at a constant speed. Solution A dripping time 3h, solution B dropping time 2.5h. After the dropwise addition of the s...

Embodiment 2

[0045] Preparation of 1000kg polycarboxylate superplasticizer as an example

[0046] To prepare polycarboxylate water reducer, the proportion is calculated according to weight percentage, put 365kg of tap water and 426kg of allyl polyoxyethylene ether into the reactor, stir at room temperature for 2.0h until fully dissolved; configure solution A in the mixing tank: Put in 50kg of tap water, 48.3kg of methyl methacrylate, 1.7kg of mercaptopropionic acid, and 0.67g of sodium L-ascorbate, and stir for 30 minutes until uniform.

[0047] Configure solution B in the mixing tank: put in 63kg of tap water, 33g of polyethylene glycol monomethyl ether methacrylate, and 10kg of sodium allyl sulfonate, and stir for 30 minutes until uniform.

[0048] Put 2.5 kg of hydrogen peroxide into the reaction kettle, stir for 15 minutes, and at the same time, add solutions A and B dropwise to the reaction kettle at a uniform speed. The solution A was added dropwise for 3 hours, and the solution B w...

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Abstract

The invention discloses a normal temperature synthetic polyester polyether polycarboxylic acid water-reducing agent and a preparation method thereof, wherein the water reducing agent is prepared as follows: at normal temperature in a redox system, esters, ethers and unsaturated carboxylic acids and derivatives thereof are polymerized to form a polymer with the carboxylic acids and derivatives thereof as a backbone, and a chain transfer agent is used for control of the degree of polymerization. Concrete prepared by the water reducing agent has the advantages of good workability, good slump lossresistance, good workability and high strength, and the water-reducing agent is suitable for precast and cast-in-place concrete, reinforced concrete and prestressed concrete for high-speed railways,passenger dedicated lines, industrial and civil buildings, roads, bridges, ports, piers, airports and other engineering construction.

Description

technical field [0001] The invention specifically relates to a normal-temperature synthetic polyester polyether polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In recent years, after years of development, the production of polycarboxylate superplasticizers in my country has gradually taken the lead in the world from imitation at the beginning. In 2011, my country's polycarboxylate superplasticizers had reached 35% of the market share. With the further improvement of people's requirements for the environment and environmental protection, polycarboxylate superplasticizer will replace other traditional admixtures. But at the same time, my country still lags behind the international leading level in the research and development of polycarboxylate superplasticizers, and more energy needs to be invested. [0003] The main components of polycarboxylate superplasticizers are mostly ether or ester polymers. Polycarboxylate superplastici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F283/06C08F220/06C08F220/14C08F4/40C08F2/38C04B24/16C04B24/26C04B103/30
CPCC04B24/165C04B24/2694C04B2103/302C08F2/38C08F4/40C08F283/065C08F290/062C08F220/06C08F220/14
Inventor 苏琳邓斌郑锦浩谭孝奎仲一夫
Owner 四川铁科新型建材有限公司
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