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Preparation method for polycarboxylate superplasticizer

A technology of water reducing agent and polycarboxylic acid, applied in the field of preparation of polycarboxylic acid water reducing agent, can solve the problems of high pollution, increased production cost, high energy consumption, etc., and achieves less equipment investment, stable product performance, and operation easy effect

Inactive Publication Date: 2015-06-10
佛山柯杰科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a preparation method of polycarboxylate water reducer, which can overcome the high energy consumption and high pollution of synthetic polycarboxylate water reducer, resulting in the increase of production cost products

Method used

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  • Preparation method for polycarboxylate superplasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a Prepare the configuration of the initiator

[0023] Add 100g of vitamin C to the container, add water to dissolve, then add 1g of trisodium phosphate and 80g of sodium allyl sulfonate, continue to add water to dissolve, and configure it into a Y solution with a mass concentration of 5%. Store them for 7 days, 15 days, 30 days, and 50 days respectively, and mark them as Y1-1, Y1-2, Y1-3, and Y1-4.

[0024] b Initiator initiates synthesis of polycarboxylate superplasticizer

[0025] Add 500g of allyl polyoxyethylene ether to the reaction vessel, add 2500g of water at the same time, stir at room temperature until completely dissolved, then add 1g of hydrogen peroxide, 50g of acrylic acid, and 5g of Y solution, and then continue to stir and react for 1.0 hours, using a mass concentration of 30% The sodium hydroxide solution is adjusted to make it PH=7, and the gained transparent liquid is the target product polycarboxylic acid.

[0026] Replace Y with Y1-1, Y1-2, Y1-3, ...

Embodiment 2

[0028] a Prepare the configuration of the initiator

[0029] Add 100g of sodium bisulfite to the container, add water to dissolve, then add 5g of mercaptopropionic acid and 40g of sodium methallylsulfonate, continue to add water to dissolve, and configure it into a Y solution with a mass concentration of 7%. Store them for 7 days, 15 days, 30 days, and 50 days respectively, and mark them as Y2-1, Y2-2, Y2-3, and Y2-4.

[0030] b Initiator initiates synthesis of polycarboxylate superplasticizer

[0031] Add 500g of sodium methallyl sulfonate to the reaction vessel, add 1000g of water at the same time, stir at room temperature until completely dissolved, then add 2g of potassium oxalate, 25g of lactic acid, and 8g of Y solution, and then continue to stir and react for 1.5 hours.

[0032] Use a sodium hydroxide solution with a mass concentration of 40% to adjust the pH to 6, and the resulting transparent liquid is the target product polycarboxylic acid.

[0033] Replace Y with ...

Embodiment 3

[0035] a Prepare the configuration of the initiator

[0036] Add 100g of hanging white cubes to the container, add water to dissolve, then add 1.5g of thioglycolic acid, 60g of 2-acrylamido-2 methylpropanesulfonic acid, continue to add water to dissolve, and configure it to a mass concentration of 10%. solution. Store them for 7 days, 15 days, 30 days, and 50 days respectively, and mark them as Y3-1, Y3-2, Y3-3, and Y3-4.

[0037] b Initiator initiates synthesis of polycarboxylate superplasticizer

[0038] Add 500g of allyl polyoxyethylene ether to the reaction vessel, add 1500g at the same time, stir at room temperature until completely dissolved, then add 2g of hydrogen peroxide, 40g of maleic anhydride, and 6g of Y solution, and then continue to stir for 1.5 hours. % sodium hydroxide solution is adjusted to make it PH=6, and the gained transparent liquid is the target product polycarboxylic acid.

[0039] According to the above, replace Y with Y3-1, Y3-2, Y3-3, Y3-4 resp...

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Abstract

Disclosed is a preparation method for a polycarboxylate superplasticizer. The method comprises the following steps that unsaturated polyether is added with water with the weight being 2-5 times the weight of the unsaturated polyether for stirring and dissolution, an oxidizing agent, a catalyst and an initiator are added into the solution, then continuous stirring reaction is performed for 1.0-1.5 h, the PH value is adjusted to range from 6 to 7, and the obtained transparent liquid is the target product; the mass ratio of the unsaturated polyether to the catalyst is 10:(0.5-1), and the mass ratio of the unsaturated polyether to the oxidizing agent is 500:(1-2); the mass ratio of the unsaturated polyether to the initiator is 500:(5-8); the oxidizing agent is hydrogen peroxide and potassium permanganate or potassium oxalate or potassium chromate or ammonium persulfate or the mixture of at least two of potassium permanganate, potassium oxalate, potassium chromate and ammonium persulfate; the catalyst is crylic acid or methacrylic acid or maleic anhydride or lactic acid or unsaturated ester or the mixture of at least two of crylic acid, methacrylic acid, maleic anhydride, lactic acid and unsaturated ester. The preparation method has the simple and convenient technological process operation, the number of input devices is small, and the obtained product is stable in performance.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a preparation method of a polycarboxylate water reducer. Background technique [0002] With the acceleration of social modernization, the demand for concrete is increasing year by year, and higher requirements are placed on the performance of concrete: high fluidity, high compression resistance, high durability and other properties are gradually improving, and the water reducing agent industry is also Invisibility is a new opportunity for development. [0003] Traditional naphthalene-based water reducers, sulfamic acid-based water reducers and aliphatic water reducers are about to withdraw from water reducers due to their performance as water reducers and the factors of high energy consumption and high pollution in the production process. The market is gradually replaced by polycarboxylate superplasticizers. [0004] The synthetic raw materials of polycarboxylate superplastic...

Claims

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Application Information

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IPC IPC(8): C08F283/06C04B24/26C04B103/30
Inventor 许永东
Owner 佛山柯杰科技实业有限公司
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