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Solid polycarboxylic acid slump retaining agent and preparation method thereof

A technology of polycarboxylic acid and slump-retaining agent, applied in the field of concrete admixtures, can solve the problems of poor slump-retaining effect of solid slump-retaining agent, poor stability of raw materials, poor adaptability, etc., so as to improve rigidity and slump-retaining performance. , the effect of rich resources

Active Publication Date: 2022-04-19
LIAONING OXIRANCHEM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a solid polycarboxylic acid slump-retaining agent, which solves the problems of poor slump-retaining effect, high transportation cost, complicated packaging, poor stability of raw materials and poor adaptability of solid slump-retaining agents in the prior art.

Method used

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  • Solid polycarboxylic acid slump retaining agent and preparation method thereof
  • Solid polycarboxylic acid slump retaining agent and preparation method thereof

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preparation example Construction

[0027] The present invention at first provides a kind of small monomer, namely the preparation method of cardanol polyoxyethylene maleic anhydride ester, it is to obtain cardanol polyoxyethylene maleic anhydride ester by cardanol polyoxyethylene ether and maleic anhydride esterification, Specifically, the following steps may be included:

[0028] Add cardanol polyoxyethylene ether to the reactor first to raise the temperature to 80-90°C, and then add p-toluenesulfonic acid as a catalyst;

[0029] Add maleic anhydride three times, the time interval between each addition is 10-15 minutes, then react for 2-3 hours, and then heat-preserve and mature for about 1 hour to obtain cardanol polyoxyethylene maleic anhydride ester.

[0030] Cardanol polyoxyethylene ether is currently widely used in the fields of non-ionic surfactants, phenolic resin modified coatings or polyurethane flame retardants. Due to its structure containing double bonds and benzene rings, it can well reduce the vi...

Embodiment 1

[0061] (1) First, to prepare cardanol polyoxyethylene maleic anhydride ester, first add cardanol polyoxyethylene ether 800, by weight, 50 parts, the reaction temperature rises to 80-90 ° C, add catalyst p-toluenesulfonic acid 2 Parts, maleic anhydride was added in three times, 3.5 parts were added each time, the time interval was 10-15min, the reaction time was 2-3h, heat preservation and aging for 1h, and the reaction was completed for later use;

[0062] (2) Weigh 70 parts of isopentenol polyoxyethylene ether in proportion, add it to the reaction kettle, and raise the temperature to 50°C for later use;

[0063] (3) Weigh 4 parts of acrylic acid, 11 parts of hydroxyethyl acrylate, and 6 parts of cardanol polyoxyethylene maleic anhydride ester in proportion, add them to the reaction kettle, stir evenly, and continue to heat up to 72°C;

[0064] (4) Add 1.2 parts of ammonium persulfate dropwise to the reaction kettle, the dropwise addition time is 3h, after the dropwise additio...

Embodiment 2

[0069] (1) First, to prepare cardanol polyoxyethylene maleic anhydride ester, first add cardanol polyoxyethylene ether 800, by weight, 50 parts, the reaction temperature rises to 80-90 ° C, add catalyst p-toluenesulfonic acid 1.5 Parts, add maleic anhydride three times, add 2.5 parts each time, the time interval is 10-15min, the reaction time is 2-3h, heat preservation and aging for 1h, and the reaction is ready for later use;

[0070] (2) Weigh 73 parts of isopentenol polyoxyethylene ether in proportion, add it to the reaction kettle, and raise the temperature to 50°C for later use;

[0071] (3) Weigh 4.5 parts of acrylic acid, 12 parts of hydroxyethyl acrylate, and 7 parts of cardanol polyoxyethylene maleic anhydride ester in proportion, add them to the reaction kettle, stir evenly, and continue to heat up to 77°C;

[0072] (4) Add 1.3 parts of ammonium persulfate dropwise to the reaction kettle, and the dropwise addition time is 3h. After the dropwise addition is completed,...

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Abstract

The invention provides a cardanol polyoxyethylene maleic anhydride ester and a preparation method thereof, as well as a solid polycarboxylic acid slump retaining agent and a preparation method thereof. The preparation method of solid polycarboxylic acid slump-retaining agent comprises: the polyether macromonomer of 70-80 weight parts is added in reactor; Cardanol polyoxyethylene maleic anhydride ester of 5-8 weight parts, 3.5-6 weight parts Parts of acrylic acid and 10‑15 parts by weight of hydroxyethyl acrylate are mixed and added to the reactor, and stirred evenly; 1‑1.5 parts by weight of the catalyst is added dropwise to the reactor, and stirred evenly; Stir the chain transfer agent in parts by weight evenly; add 0.2-0.3 parts by weight of neutralizing material into the reactor, stir to obtain a semi-finished product; and cool the semi-finished product after drying to obtain a solid polycarboxylate slump retaining agent. The solid polycarboxylate slump-retaining agent of the invention has strong adaptability, not only improves the rigidity of the product, but also reduces the viscosity of concrete, and significantly improves the slump-retaining performance.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a cardanol polyoxyethylene maleic anhydride ester and a preparation method thereof, and a solid polycarboxylic acid slump-retaining agent and a preparation method thereof. Background technique [0002] With the development of society and the advancement of science and technology, the construction industry has higher and higher requirements for concrete, which means that concrete admixtures are widely used. Slump retaining agent is the most common concrete admixture, which is mainly used to slow down the hydration and condensation of cement, so as to maintain the slump. [0003] In the current concrete admixture market, polycarboxylate superplasticizers occupy most of the market due to their superior performance. However, the actual application of concrete is often more complicated. Due to the limitation of the construction site and the difference in quality of raw ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F290/06C08F220/06C08F220/20C08G65/332C04B24/26C04B103/30
CPCC04B24/2694C08F290/062C08F283/065C08G65/3322C04B2103/302C08F220/06C08F220/20
Inventor 董振鹏朱建民刘兆滨马维英
Owner LIAONING OXIRANCHEM INC
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