Method for preparing starch-based high-performance water reducing agent and product thereof

A starch-based, high-performance technology, which is applied in the field of concrete admixtures, to achieve the effects of improving concrete workability, good steric hindrance effect, and reducing segregation and bleeding

Active Publication Date: 2021-04-06
建研建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has excellent adaptability to different cements, admixtures, machine-made sand, tailings sand, ambient temperature and concrete mix ratio fluctuations, and is more conducive to solving concrete problems caused by the use of machine-made sand, tailings sand, recycled aggregates and poor grading. Workability problems such as segregation and bleeding

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  • Method for preparing starch-based high-performance water reducing agent and product thereof

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preparation example Construction

[0039] The preparation of the starch-based high-performance water reducer comprises the following steps:

[0040] Preparation of controllable acid-degradable starch raw material: using water as the reaction medium, making starch into a starch mixture with a mass percentage of 20% to 90%, adding an acidolysis catalyst and an oxidant to react to obtain a controllable acid-degradable starch raw material; preferably, The starch is one or more of corn starch, tapioca starch, sweet potato starch, potato starch, wheat starch, bean starch or modified starch; in addition, the acidolysis catalyst is sulfuric acid, nitric acid, sodium bisulfate, One or more of sulfamic acid or p-toluenesulfonic acid in an amount of 1% to 15% of the starch quality; and the oxidizing agent is potassium permanganate, hydrogen peroxide, ammonium persulfate, potassium persulfate or high One or more kinds of iodic acids are used in an amount of 1% to 10% of the starch mass.

[0041] Preparation of starch-base...

Embodiment 1

[0050] The embodiment of the present invention provides a starch-based functional macromonomer and a method for preparing a starch-based high-performance water reducer. The specific steps are as follows:

[0051] (1) Weigh 40g of cornstarch and 60g of water to make a 40% starch mixture, slowly add 1.2g of sulfuric acid and stir evenly, heat up to 60°C for 6 hours, then add 3.4g of hydrogen peroxide and mix well, vacuum at 55°C Drying for 2 hours and reacting at 110°C for 2 hours to obtain controllable acid-degraded starch (weight average molecular weight Mw is 2500-17800).

[0052] (2) Add 40g of controllable acid-degraded starch and 3.6g of methacrylic acid into the reactor, add 0.6g of p-toluenesulfonic acid and 0.05g of methylaniline, stir and heat to 120°C for esterification reaction, react for 3 hours, and prepare Obtain starch-based functional macromonomers (weight-average molecular weight Mw is 2800-19200, wherein the proportion of starch-based functional macromonomers ...

Embodiment 2

[0055] The embodiment of the present invention provides a starch-based functional macromonomer and a method for preparing a starch-based high-performance water reducer. The specific steps are as follows:

[0056](1) Weigh 35g of cornstarch, 15g of potato starch and 50g of water to make a 50% starch mixture, slowly add 1.2g of sulfuric acid and stir evenly, heat up to 60°C for 8 hours, then add 5.6g of hydrogen peroxide and mix well, Vacuum drying at 55°C for 2 hours, and reaction at 115°C for 2 hours to obtain controllable acid-degraded starch (weight-average molecular weight Mw: 2680-17400).

[0057] (2) Add 50g of controllable acid-degraded starch and 3g of maleic anhydride into the reactor, add 0.7g of p-toluenesulfonic acid and 0.03g of tert-butylcatechol, stir and heat to 115°C for esterification reaction, and react for 4h. The obtained starch-based functional macromonomer (the weight-average molecular weight Mw is 3150-18820, wherein the proportion of the starch-based fu...

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Abstract

The invention discloses a method for preparing a starch-based high-performance water reducing agent and a product thereof, and the method comprises the steps of: taking a starch-based functional macromonomer as a main chain skeleton, and grafting the starch-based functional macromonomer to the starch-based main chain skeleton through unsaturated polyether and unsaturated carboxylic acid to form a molecular form of a rotary comb-shaped structure. The invention also discloses a preparation method of the starch-based high-performance water reducing agent. The preparation method mainly comprises the following steps: preparing a controllable acid-degraded starch raw material, preparing a starch-based functional macromonomer, and carrying out free radical copolymerization reaction. The process is simple, waste liquid, waste gas and waste residues are not generated in the preparation process, and the process is a green low-carbon synthesis process. The starch-based high-performance water reducing agent provided by the invention can effectively solve the problems of sensitivity and adaptability of a polycarboxylate water reducing agent in the mixing amount, can improve the workability, cohesiveness and other working states of concrete, and can reduce shrinkage cracking of the concrete. The method has excellent adaptability to different cement, admixtures, machine-made sand, tailing sand, environment temperature and concrete mix proportion fluctuation.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a method for preparing a starch-based high-performance water reducer and a product thereof. Background technique [0002] Concrete admixture is the core material for preparing and affecting the performance of modern concrete. The development of high-performance green admixture preparation and application technology will help to ensure the quality of concrete and promote the development of green and durable buildings. With the strengthening of environmental protection in my country, the exploitation of natural resources for concrete is limited, and materials such as machine-made sand, tailings sand, recycled aggregates, and artificial composite admixtures are used in large quantities. Due to fluctuations and other factors, the encapsulation and workability of freshly mixed concrete paste are quite different, and problems such as segregation, bleeding, bottom grabbing, and pump b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C08F251/00C08F220/06C08F228/02C08F222/02C08F212/14C04B103/30
CPCC04B24/38C04B2103/302C08F251/00C08F220/06C08F228/02C08F222/02C08F212/14
Inventor 王万金赖振峰黄靖冷发光丁印王浩
Owner 建研建材有限公司
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