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Hyperbranched polyester-polycarboxylate water reducing agent and preparation method for same

A hyperbranched polyester and polycarboxylic acid-based technology, applied in the field of concrete admixtures, can solve the problems of high production cost, poor adaptability and poor adaptability of cement and polycarboxylic acid-based water-reducing agents, and achieves increased water-reducing, Improve dispersibility retention performance and increase the effect of steric hindrance

Inactive Publication Date: 2015-02-18
SHANDONG HONGYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual application of domestic polycarboxylate superplasticizers, due to the complexity of cement varieties, there is still the problem of poor adaptability between cement and polycarboxylate superplasticizers, and only a very small number of products have certain adaptability
At present, most of the polycarboxylic acid high-efficiency water-reducers reported in domestic literature and patents are polyester-type; while polyether-type water-reducers often use petroleum as raw material because the polyethylene glycol content accounts for 80-90%, and the production cost is relatively high. High and poor adaptability, which also limits its development and promotion

Method used

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  • Hyperbranched polyester-polycarboxylate water reducing agent and preparation method for same

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preparation example Construction

[0025] A kind of preparation method of hyperbranched polyester-polycarboxylate water reducer is realized through the following steps, as figure 1 Shown:

[0026] 1) Synthesis of hyperbranched polyester:

[0027] Add maleic anhydride and ammonium persulfate to ethyl acetate, the molar ratio of maleic anhydride to ethyl acetate is 2:1, and the ammonium persulfate is 0.25% of the molar number of maleic anhydride. Dissolve completely to obtain a maleic anhydride solution; then add ethylene glycol at a molar ratio of 0.2:1 to maleic anhydride, wherein, during the addition of ethylene glycol, the flow rate is 0.4ml / min, 30°C, The stirring speed is 40r / min, and then at 30°C and the stirring speed is 40r / min, react for 20h to obtain a hyperbranched polyester solution;

[0028] 2) Synthesis of hyperbranched polyester-polycarboxylate water reducer:

[0029] Toluenesulfonic acid, ammonium persulfate and oligosaccharides are added to the polycarboxylate water reducer with a mass fracti...

Embodiment 2

[0032] A kind of preparation method of hyperbranched polyester-polycarboxylate water reducer is realized by following steps, as figure 1 Shown:

[0033] 1) Synthesis of hyperbranched polyester:

[0034] Add maleic anhydride and ammonium persulfate to ethyl acetate, the molar ratio of maleic anhydride to ethyl acetate is 4:1, ammonium persulfate is 0.5% of the molar number of maleic anhydride, and wait Dissolve completely to obtain a maleic anhydride solution; then add ethylene glycol at a molar ratio of 1:1 to maleic anhydride, wherein, during the addition of ethylene glycol, the flow rate is 0.8ml / min, 35°C, The stirring speed is 60r / min, and then at 35°C and the stirring speed is 60r / min, react for 25h to obtain a hyperbranched polyester solution;

[0035] 2) Synthesis of hyperbranched polyester-polycarboxylate water reducer:

[0036]Add p-toluenesulfonic acid, ammonium persulfate and oligosaccharides to the polycarboxylate water reducer with a mass fraction of 40%, adjus...

Embodiment 3

[0039] A kind of preparation method of hyperbranched polyester-polycarboxylate water reducer is realized through the following steps, as figure 1 Shown:

[0040] 1) Synthesis of hyperbranched polyester:

[0041] Add maleic anhydride and ammonium persulfate to ethyl acetate, the molar ratio of maleic anhydride to ethyl acetate is 6:1, and the ammonium persulfate is 1% of the molar number of maleic anhydride. Dissolve completely to obtain a maleic anhydride solution; then add ethylene glycol at a molar ratio of 2.5:1 to maleic anhydride, wherein, during the addition of ethylene glycol, the flow rate is 1.0ml / min, 40°C, The stirring speed is 90r / min, and then at 40°C and the stirring speed is 90r / min, react for 30h to obtain a hyperbranched polyester solution;

[0042] 2) Synthesis of hyperbranched polyester-polycarboxylate water reducer:

[0043] Toluenesulfonic acid, ammonium persulfate and oligosaccharides are added to the polycarboxylate water reducer with a mass fraction ...

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Abstract

The invention discloses a hyperbranched polyester-polycarboxylate water reducing agent and a preparation method for the same. The method comprises the following steps: synthesizing hyperbranched polyester, adding oligosaccharide, ammonium persulfate, a polycarboxylate water reducing agent and a catalyst, performing end group modification on the hyperbranched polyester under the action of the catalyst, and synthesizing the hyperbranched polyester-polycarboxylate water reducing agent. According to the hyperbranched polyester-polycarboxylate water reducing agent and the preparation method for the same, a synthesis process is researched from the designability and controllability of branching degree and molecular weight during the synthesis of the hyperbranched polyester to further prepare a novel polycarboxylate water reducing agent product with high performance and adaptability, an experimental basis is provided for industrial application and popularization, and meanwhile, important theoretical value and economic benefits are created.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a hyperbranched polyester-polycarboxylate water reducer and a preparation method thereof. Background technique [0002] High-efficiency water reducer, also known as superplasticizer, is an important concrete admixture and one of the important products in the pillar industry of new building materials. With the development of concrete technology, the requirements of environmental protection, high strength, high durability and high working performance are put forward for concrete. The second generation of water reducing agent can not meet the requirements of concrete industry, which restricts the development of concrete. The third-generation high-performance superplasticizer represented by polycarboxylic acid series has become an environmentally friendly high-performance superplasticizer recognized at home and abroad because of its high water-reducing rate, high dispersibility and high slump ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B103/30
Inventor 赵洪义陈相田朱化雨赵建国朱孔赞
Owner SHANDONG HONGYI TECH
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