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Rust resistance type starch-base water reducer and preparation method thereof

A water-reducing agent and starch-based technology, which is applied in the field of starch-based water-reducing agent and its preparation, can solve the problem of the toxicity of the small-molecule steel rust inhibitor, the incompatibility of water-reducing and rust-inhibiting effects, and the mixing of concrete admixtures. Low volume and other problems, to achieve excellent anti-rust function, reduce application costs, and low production costs

Active Publication Date: 2018-04-20
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems in the prior art that the water-reducing and rust-inhibiting effects of the water-reducing agent cannot be achieved at the same time, the production process is complex, the preparation cost is high, and the small-molecule steel bar rust inhibitor is toxic, the present invention provides a simple preparation process, low raw material cost, and a A new type of environmentally friendly macromolecular water reducer with good water antirust effect and its preparation method. The functional concrete admixture prepared by this technical route has low dosage, high water reduction rate, good cement slurry fluidity, good cohesion, and excellent performance. anti-rust function

Method used

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  • Rust resistance type starch-base water reducer and preparation method thereof
  • Rust resistance type starch-base water reducer and preparation method thereof
  • Rust resistance type starch-base water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 50g of industrial-grade common cornstarch and 75g of water to make starch milk containing 40% starch, add 5g of 98% concentrated sulfuric acid, then heat in a water bath for hydrolysis reaction, stop heating after 2h, cool down to room temperature without neutralization, and keep the residual sulfuric acid. Use vacuum filtration, dry and store at low temperature. Add 5 g of thioglycolic acid dropwise to the obtained acid-thinned starch, and mix well. Maleic anhydride 2.5g, sulfamic acid (NH 3 SO 3 ) 1.5g mixed and ground, then added to the mixture of the above-mentioned acid-thinned starch and thioglycolic acid, then added 10g of water and mixed fully, stirred evenly, synthesized by a semi-dry method, put it in a 50°C oven for 2 hours, and heated up to After reacting at 100°C for 4 hours, the starch sample was taken out, dried and ground to obtain a starch-based water reducer with the function of inhibiting steel corrosion.

Embodiment 2

[0036] Add 50g of industrial-grade common corn starch and 75g of water to make starch milk containing 40% starch, add 2.5g of 98% concentrated sulfuric acid, then heat in a water bath for hydrolysis reaction, stop heating after 2h, cool down to room temperature without neutralization, and keep the residual sulfuric acid , vacuum filtered, dried and stored at low temperature. Add 5 g of thioglycolic acid dropwise to the obtained sulfonated starch, and mix well. Mix and grind 5g of maleic anhydride and 4.5g of sulfamic acid, then add to the above mixture of acid-thyzed starch and thioglycolic acid, and then add 10g of water to fully mix, stir evenly, synthesize by semi-dry method, and put in an oven at 50°C React in medium for 2 hours, raise the temperature to 100°C, react for 4 hours, take out the starch sample, dry and grind to obtain the starch-based water reducer with the function of inhibiting steel corrosion.

Embodiment 3

[0038] Add 50g of industrial-grade common cornstarch and 75g of water to make starch milk containing 40% starch, add 1g of 98% concentrated sulfuric acid, then heat in a water bath for hydrolysis reaction, stop heating after 2h, cool down to room temperature without neutralization, and keep the residual sulfuric acid. Use vacuum filtration, dry and store at low temperature. Add 7.5 g of thioglycolic acid dropwise to the obtained acid-thinned starch, and mix well. Mix and grind maleic anhydride 5g and sulfamic acid 10.5g, then use semi-dry method to synthesize, put it in a 60°C oven for 2 hours, heat up to 110°C, react for 4 hours, take out the starch sample, dry and grind to obtain Starch-based superplasticizer with steel bar corrosion function.

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Abstract

The invention belongs to the field of constructional engineering material concrete water reducers, in particular to a starch-base water reducer with a reinforcement corrosion inhibition function. Thewater reducer is based on a starch-base water reducer, and is formed by adding mercaptoacetic acid to the starch-base water reducer to perform grafting reaction, and the mixing amount of the water reducer can be 0.2 to 1 percent of the weight of cement. The water reducer prepared through a method is high in water reducing ratio, good in the fluidity of cement paste and good in cohesiveness, belongs to substance added and prepared in simulated concrete pore solution saline solution, and has an excellent rust resistance function.

Description

technical field [0001] The invention belongs to the field of concrete water reducer for construction engineering materials, and in particular relates to a starch-based water reducer capable of inhibiting steel bar corrosion and a preparation method thereof. Background technique [0002] Concrete water reducer can improve the workability of fresh concrete, increase the strength of concrete and other physical and mechanical properties. Water reducer has become the fifth component of concrete materials. In the construction industry, superplasticizers are widely used in bulk, roller compacted and pumped concrete to maintain workability for a long period of time. Formaldehyde, naphthalene, phenol and other petrochemical products were used in the production process of the early lignosulfonate ordinary water reducer and sulfonated aromatic polymer high-efficiency water reducer, which would cause certain environmental pollution. The most widely used polycarboxylate water-reducer wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/04C04B24/16C04B103/30C04B103/61
CPCC04B24/168C04B2103/302C04B2103/61C08B31/04
Inventor 何辉蒋亚清陈志健吕文轩高雪原
Owner HOHAI UNIV
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