Silicon-containing polycarboxylate superplasticizer as well as preparation method and use thereof

A technology of silicon polycarboxylate and water reducer, applied in the field of silicon-containing polycarboxylate water reducer, can solve the problems of reducing the molecular utilization rate and dispersibility of polycarboxylate water reducer.

Active Publication Date: 2015-04-29
SHANGHAI TAIJIE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, Professor J. Plank’s research on the adsorption process of polycarboxylate superplasticizers believes that there are a large number of intercalation and voids in the mud and the road, resulting in the comb-like structure of polycarboxylate superplasticizer molecules being consumed by intercalation and gap adsorption. , thereby reducing the utilization rate and dispersibility of polycarboxylate superplasticizer molecules

Method used

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  • Silicon-containing polycarboxylate superplasticizer as well as preparation method and use thereof
  • Silicon-containing polycarboxylate superplasticizer as well as preparation method and use thereof
  • Silicon-containing polycarboxylate superplasticizer as well as preparation method and use thereof

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preparation example Construction

[0047] Illustrate that the preparation method of the silicone anti-mud type polycarboxylate water reducer provided by the present invention comprises the following steps:

[0048] 1) Synthesis of large molecular size organosilicon monomer:

[0049] Organic silicon groups are introduced into the polymer structure. The molecular structure of organic silicon raw materials used is shown in Figure (I), and the molecular structure of organic silicon with active double bonds is shown in Figure (II). The unsaturated monomer structure is shown in Figure (Ⅲ);

[0050]

[0051] The prepared silicon-containing polycarboxylate water reducer is shown in structural formula (IV):

[0052]

[0053]This step is a chemical reaction between the silane coupling agent aminopropyltriethoxysilane (KH-550) and dry maleic anhydride under cooling conditions, and introduces a C=C double bond structure into the KH-550 molecule through an amide bond ; Then under the catalysis of the ethanol solutio...

Embodiment 1

[0064] Add 200g of dry maleic anhydride into the three-necked flask, slowly and uniformly add 250g of silane coupling agent KH-550 under ice-salt bath cooling condition, and stir rapidly, stirring for 1h. Under rapid stirring conditions, add 25ml of ethanol solution with a concentration of 0.2mol / L KOH, stir well, then add 70g of water, and add 1000g of KH-550 at a uniform speed for 5 hours. After reacting for 12 hours under low-speed stirring condition, the residual water and alcohol compounds were distilled off under reduced pressure to obtain silicon-containing monomers with relatively large molecular weights.

[0065] Add 100g of the silicon-containing monomer prepared above and 150g of modified polyether (TPEG) with a molecular weight of 2400 into the reaction vessel, add 200g of distilled water, stir and heat up to 65-80°C, add 3.0g of initiator sodium persulfate, and start the process after stirring evenly 55.0 g of acrylic acid and 40 g of a 5 wt % solution of chain tr...

Embodiment 2

[0067] Add 200g of dry maleic anhydride into the three-necked flask, slowly and uniformly add 250g of silane coupling agent KH-550 under ice-salt bath cooling condition, and stir rapidly, stirring for 1h. Under the condition of rapid stirring, add 20ml of ethanol solution with a concentration of 0.2mol / L KOH, stir well, then add 70g of water, and add 500g of KH-550 at a uniform speed for 3 hours. The reaction was carried out for 6 hours under low-speed stirring, and the residual water and alcohol compounds were removed by distillation under reduced pressure to obtain a silicon-containing monomer with a relatively small molecular weight.

[0068] Add 100g of the silicon-containing monomer prepared above and 200g of modified polyether (TPEG) with a molecular weight of 2400 into the reaction vessel, add 200g of distilled water, stir and heat up to 65-80°C, add 3.0g of initiator sodium persulfate, and start the process after stirring evenly 50.0 g of acrylic acid and 35 g of a 5 w...

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Abstract

The invention discloses a silicon-containing polycarboxylate superplasticizer. The silicon-containing polycarboxylate superplasticizer is characterized by having a molecular structural formula (IV) as shown in the specification, wherein a and b are both greater than 0. C is greater than or equal to 0, and d is greater than 0; M1 is an organic silicon monomer structure of which the molecular structure contains a plurality of organic silicon molecules cross-linked by use of Si-O-Si bonds; M2 is one or both of -H and -Na; M3 is one or both of -H and -Na; M4 is one or both of ester monomers or ether monomers. According to the silicon-containing polycarboxylate superplasticizer, the organic silicon structure is introduced into the structure of the common polycarboxylate superplasticizer. A double-bond organic silicon monomer of a large molecular size is prepared by virtue of the hydrolysis reaction, and then the prepared organic silicon monomer is used in a polycarboxylate superplasticizer synthesis system, and therefore, the molecular size of the polycarboxylate superplasticizer is increased and then the polycarboxylate superplasticizer cannot come into the intercalation structure of soil easily, and furthermore, the effects of resisting soil and retarding consumption are achieved.

Description

technical field [0001] The invention relates to a silicon-containing polycarboxylate water reducer, its preparation method and application. Background technique [0002] Polycarboxylate superplasticizer, also known as superplasticizer (Polycarboxylate Superplasticizer), is a common construction additive, especially in high-grade concrete, concrete prefabricated components, high-rise pumping construction projects, polycarboxylate superplasticizer It has become one of the essential concrete admixtures at present. Polycarboxylate superplasticizer was first invented and patented by Kao Corporation of Japan in the 1980s. After more than ten years of development, it has replaced traditional naphthalene-based water-reducers and lignin-based water-reducers in Japan, Europe and the United States. . The article on the properties of polycarboxylate superplasticizers published by Japanese scholars in 1985 is the earliest document on the synthesis method of polycarboxylate superplastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F230/08C08F220/06C08F228/02C08F2/38C04B24/16C04B24/26C04B103/30
Inventor 朱伟亮
Owner SHANGHAI TAIJIE CHEM
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