A kind of preparation method of anti-mud type polycarboxylate water reducer

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixture, and can solve the problems of affecting the effect of water reducing and dispersing, poor effect of sulfonic acid groups, complicated preparation process, etc.

Active Publication Date: 2020-10-27
南京建高新材料科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The third method of using a sacrificial agent is relatively simple and effective. The sacrificial agent is preferentially adsorbed by the mud to reduce the loss of the polycarboxylate superplasticizer being adsorbed by the mud. Polyoxyethylene ethers with similar structures are used as raw materials, and the price of raw materials and application costs are relatively high, which limits the application and promotion of this method
[0007] At present, the main problems of the molecular modification method of polycarboxylate superplasticizer are as follows: 1. The preparation process of quaternary ammonium salt is relatively complicated, which will weaken the adsorption and positioning effect of polycarboxylate superplasticizer on the positively charged cement particle surface, 2. The introduction of phosphonic acid or sulfonic acid derivatives into the main chain of polycarboxylic acid molecules requires double bonds to participate in the initiation of copolymerization, while vinyl phosphonate, vinyl sulfonate, and allyl phosphine Allyl sulfonate and allyl sulfonate are expensive fine chemicals, and the application cost is high. The sulfonic acid group is not effective when used alone, and the more expensive alkenyl phosphonate plays a major role; 3. Allyl hydroxyethyl ester and allyl hydroxypropyl ester can play a slow-release effect, so as to obtain the effect similar to the "pre-mixing method" of water reducing agent, saving the amount of water reducing agent, but it does not change the clay's effect on clay in essence. Competitive adsorption of polycarboxylic acid molecules, and the unit price is relatively expensive

Method used

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  • A kind of preparation method of anti-mud type polycarboxylate water reducer
  • A kind of preparation method of anti-mud type polycarboxylate water reducer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: a kind of preparation method of anti-mud type polycarboxylate superplasticizer comprises the following steps:

[0025] (1) After grinding 3.1g maleic anhydride, add it to 5.5g dry powdered glucose, form a solution with 1g concentrated sulfuric acid, 0.1g inhibitor and 1.2g deionized water, and add the solution to the After aging for 15 minutes in the mixture of maleic anhydride and glucose, put it into an oven and react at 120 degrees Celsius for 2 hours to fully evaporate and dry the water to obtain the mixture I. Grind the mixture I, then add 2.57g of 50% phosphoric acid aqueous solution, stir and mix evenly, after aging for 15 minutes, put it in an oven, heat and react at 120 degrees Celsius for 1.5 hours to obtain the mixture II.

[0026] (2) Mix 6.5g maleic anhydride, 4.5g triethanolamine, 0.2g polymerization inhibitor and 9g polyethylene glycol monomethyl ether evenly, under the catalysis of 0.2g p-toluenesulfonic acid, under the condition of heating...

Embodiment 2

[0029] Embodiment 2: a kind of preparation method of anti-mud type polycarboxylate superplasticizer comprises the following steps:

[0030] (1) Grind 5.8g maleic anhydride and add it to 1( ).2g dry powdered glucose, form a solution with 1.7g concentrated sulfuric acid, 0.2g polymerization inhibitor and deionized water, and make the solution under stirring condition Add it into the mixture of maleic anhydride and glucose, age for 15 minutes, put it in an oven, react at 120 degrees Celsius for 2 hours, make the water fully evaporate and dry, and obtain the mixture I. Grind the mixture I, then add 4.8g of 50% phosphoric acid aqueous solution, stir and mix evenly, after aging for 15 minutes, put it in an oven, heat and react at 120 degrees Celsius for 1.5 hours to obtain the mixture II.

[0031] (2) Mix 6.7g maleic anhydride, 4.8g triethanolamine, 0.2g polymerization inhibitor and 10.2g polyethylene glycol monomethyl ether, under the catalysis of 0.2g p-toluenesulfonic acid, heat ...

Embodiment 3

[0034] Embodiment 3: a kind of preparation method of anti-mud type polycarboxylate superplasticizer comprises the following steps:

[0035] (1) After grinding 7.6g maleic anhydride, add it to 13.4g dry powdered glucose, form a solution with 4.5g phosphoric acid, 1.9g concentrated sulfuric acid, 0.2g inhibitor and deionized water, and stir the The solution was added to a mixture of maleic anhydride and glucose, aged for 15 minutes, put into an oven, and reacted at 120 degrees Celsius for 2 hours to fully evaporate and dry the water to obtain mixture I. Grind the mixture I, then add 6.3g of 50% phosphoric acid aqueous solution, fully stir and mix evenly, after aging for 20 minutes, put it in an oven, heat and react at 120 degrees Celsius for 1.5 hours to obtain the mixture II.

[0036] (2) Mix 7.2g maleic anhydride, 5g triethanolamine, 0.25g polymerization inhibitor and 12.3g polyethylene glycol monomethyl ether, under the catalysis of 0.5g p-toluenesulfonic acid, under the cond...

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Abstract

The invention discloses a muddy-resistant polycarboxylate water-reducer and a preparation method thereof. The muddy-resistant polycarboxylate water-reducer comprises the following raw materials: a maleic acid, triethanolamine, polyoxyethylene monomethyl ether, acrylamide, a crylic acid, isoamyl polyoxyethylene ether, a maleic acid grafted glucose phosphate derivative and water. The preparation method for the muddy-resistant polycarboxylate water-reducer is green and environmental, the water reducing dispersibility is good, the muddy-resistant effect is remarkable, the adaptability to mud-containing aggregate is strong, and the cost performance is high. The production process is green and environmental without the three waste emission, and accords with a concept of green and environmental protection and sustainable development.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a preparation method of a high-performance polycarboxylate concrete water reducer with anti-mud function. Background technique [0002] With the development of construction technology, the trend of high-performance concrete is becoming more and more obvious. Due to the great advantages of water reducing agent in improving concrete workability, strength and durability, it has become an indispensable fifth component in concrete. At present, the coagulation superplasticizer has developed from the early generation of lignosulfonate, sugar calcium and the second generation of naphthalene series and aliphatic high-efficiency superplasticizers to the third generation of high-performance polycarboxylate superplasticizers, and the annual usage continues to increase. It has become an important market in the field of building materials. The third-generation polycarboxylate superplasticiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C04B24/32C04B103/30
CPCC04B40/0039C04B2103/302C04B24/2652C04B24/122C04B24/32C04B24/16
Inventor 何辉蒋亚清高雪原徐中华邱阿莲
Owner 南京建高新材料科技有限公司
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