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Polyester monomer and preparation method thereof as well as polycarboxylate water reducing agent

A monomer and polyester technology, applied in the field of water reducing agent, can solve the problems of short retention time of concrete slump, bleeding, poor slump retention of concrete, etc.

Inactive Publication Date: 2017-08-18
吉林众鑫化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyether monomer is a necessary monomer for the production of polyether-type polycarboxylate superplasticizer. When the polycarboxylate superplasticizer synthesized with it encounters concrete with a lot of soil, the common problem is that the concrete has poor slump retention and the pump Delivery is difficult
However, in concrete with a lot of soil content, the soil first adsorbs the polycarboxylate superplasticizer, so that the amount of superplasticizer adsorbed on the cement particles is insufficient, the water reducing effect becomes worse, and the fluidity of the concrete becomes poor, reflecting that the concrete Short slump retention times make concrete difficult to pump
[0005] At present, the method to solve more soil in concrete is to add substances with amino groups to the synthetic polycarboxylate water reducer to improve the anti-soil effect, but the effect in practical application is not very ideal
Or solve the problem of more soil in concrete by adding too much polycarboxylate slump retaining agent, but at the same time there will be problems such as bleeding, and at the same time increase the cost of the concrete mixing plant

Method used

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  • Polyester monomer and preparation method thereof as well as polycarboxylate water reducing agent
  • Polyester monomer and preparation method thereof as well as polycarboxylate water reducing agent
  • Polyester monomer and preparation method thereof as well as polycarboxylate water reducing agent

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preparation example Construction

[0026] A preparation method of polyester monomer, comprising:

[0027] At least two isocyanate groups in the isocyanate compound are reacted with the enol compound and the polyglycol monoether, respectively.

[0028] Among them, the molecular structure of the isocyanate compound used in the embodiment of the present invention contains a linking group, and the linking group includes at least one ring structure, and the ring structure includes C3~C8 cycloalkyl, C3~C8 cycloalkenyl and at least one of the aryl groups. Preferably, the ring structure includes at least one of C3-C6 cycloalkyl, C3-C6 cycloalkenyl and phenyl. The size of the ring structure is larger than the size of the multi-network layered structure of the soil. Therefore, when encountering concrete containing soil, the ring structure will reduce or prevent polycarboxylate superplasticizer molecules from being absorbed into the soil, thereby achieving the effects of soil resistance and water reduction. Through the...

Embodiment 1

[0044] The present invention provides a kind of polyester monomer Ia, with reference to figure 1 Shown, its preparation method is as follows:

[0045] S1. In a 1000ml four-neck flask equipped with a reflux cooling tube, a stirrer, a thermometer and a dropping device, add 0.55mol of prenyl alcohol and 400ml of ethyl acetate, stir and heat up to 50°C, add 1mol% of Dibutyltin diacetate, under the protection of nitrogen, began to dropwise add the solution of isocyanate compound IIa (0.5mol isocyanate compound IIa dissolved in 200ml ethyl acetate), the dropwise addition was completed after 0.5h, and the reaction was continued for 3h while maintaining the temperature. After the reaction, the polyester intermediate (0.47mol, yield 94%) was obtained through purification.

[0046] S2, add 0.47mol polyester intermediate and 0.47mol polyethylene glycol monomethyl ether in the 1000ml four-necked bottle that is equipped with reflux cooling tube, stirrer, thermometer and dropping device, a...

Embodiment 2

[0048] This embodiment provides a polycarboxylate water reducer, which is obtained by copolymerizing the mixture of polyester monomer Ia and polyether monomer (prenol polyoxyethylene ether) in embodiment 1 with acrylic acid. Wherein, the material ratio of the polyester monomer Ia and the polyether monomer is 1:9. Concrete preparation method is as follows:

[0049] In a 1000ml four-necked bottle equipped with a stirrer, a thermometer, and a dropping device, dissolve 0.02mol polyester monomer Ia and 0.18mol polyether monomer in water, stir and heat up to 40°C, add 0.5mol% trigger After stirring for 5 minutes, a mixed solution of 0.2 mol% reducing agent and 0.5 mol% chain transfer agent, and an aqueous solution of 0.34 mol acrylic acid were added dropwise. The mixed solution of reducing agent and chain transfer agent was dropped within 3 hours, and the aqueous solution of acrylic acid was dropped within 2.5 hours. After the dropwise addition was completed, the temperature was m...

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Abstract

The invention discloses a polyester monomer and a preparation method thereof as well as a polycarboxylate water reducing agent and relates to the field of water reducing agents. According to the preparation method, an isocyanate compound with a linking group and multiple isocyanate groups is adopted as a reaction substrate, wherein the linking group comprises at least one cyclic structure. The polyester monomer adopting the cyclic structure is formed through reaction of at least two isocyanate groups of the isocyanate compound with an enol compound and polyglycol monoether respectively. As soil adopts a composite net layered structure, the size of the new cyclic structure of the polyester monomer is larger than that of the composite net layered structure of the soil. When the polycarboxylate water reducing agent synthesized from the polyester monomer adopting the cyclic structure encounters concrete containing soil, the cyclic structure of polyester monomer molecules can reduce or stop polycarboxylate water reducing agent molecules from being sucked into the soil, so that soil-resistant and water reducing effects are realized.

Description

technical field [0001] The invention relates to the field of water reducers, in particular to a polyester monomer, a preparation method thereof and a polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizer is currently the most commonly used type of high-efficiency water reducer. Compared with traditional naphthalene sulfonate formaldehyde condensation products and melamine formaldehyde condensation products, polycarboxylate superplasticizers have a higher permeability Low, good slump performance, low concrete shrinkage, strong adjustability in molecular structure and other advantages. [0003] In the prior art, polycarboxylate water reducers are usually obtained by polymerization of polyether monomers and unsaturated acid monomers as main components. Polyether monomer is a necessary monomer for the production of polyether-type polycarboxylate superplasticizer. When the polycarboxylate superplasticizer synthesized with it encounters con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/333C08F283/06C08F220/06C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F283/065C08G65/33355C08G65/33358C08F220/06
Inventor 贾洪文孙东日柳旭峰周华龙汪颖丁慧文
Owner 吉林众鑫化工集团有限公司
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