Method for preparing modified lignin poly-carboxylic-acid cement dispersant

A technology of cement dispersant and plain polycarboxylate, which is applied in the field of preparation of modified lignin polycarboxylate cement dispersant, can solve the problem of rapid hardening of concrete slump loss, and the synthesis process of polycarboxylate water reducer Complicated, poor concrete predictability and other problems, to achieve the effect of good cement adaptability and compatibility, high cost performance, and small slump loss

Inactive Publication Date: 2009-01-21
武汉海德天物新材料有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Its disadvantages are: poor compatibility and poor predictability to concrete. For example, when polycarboxylate water reducer is used together with other admixtures, the concrete slump loss is too fast and it is prone to rapid hardening. Compatibility problems between cement and chemical admixtures; in concrete using high-performance water reducing agents, when the unit water volume decreases and the slump increases, the following problems often occur: the amount of water reducing agent is too large, the concrete viscosity is too large, Segregated bleeding phenomenon, difficult pumping
Moreover, the synthesis process of polycarboxylate water reducer is complicated, and the raw materials are relatively expensive.

Method used

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  • Method for preparing modified lignin poly-carboxylic-acid cement dispersant
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  • Method for preparing modified lignin poly-carboxylic-acid cement dispersant

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preparation example Construction

[0025] The preparation method of modified lignin polycarboxylate cement dispersant is characterized in that comprising following weight components and steps:

[0026] A. Take 30-60 parts of lignosulfonate aqueous solution with a solid content of 20-40%, put it into the reaction kettle, stir and heat up to 50-80°C, and then put in 5-9 parts of sodium dichromate and 10 parts of polyvinyl alcohol in turn. -20 parts, 5-18 parts of acrylic acid, 0.1-3 parts of initiator, and react at a temperature of 80-100°C for 3-5 hours to obtain a modified lignosulfonate aqueous solution.

[0027] B. Put 10-35 parts of maleic anhydride, 20-60 parts of hydroxyacrylate, 10-25 parts of styrene and 1-5 parts of peroxide into the reaction kettle, stir and heat up, and react at 80°C-160°C 2-6 hours, obtain polycarboxylate modifier;

[0028] C. Put 200-400 parts of water, 10-40 parts of ammonium persulfate, and 10-18 parts of sulfite into the reaction kettle in sequence, raise the temperature to 40-6...

Embodiment 1

[0031] Take 40 parts of lignosulfonate aqueous solution with a solid content of 20-40%, put it into the reaction kettle, stir and heat up to 60°C, then put in 6 parts of sodium dichromate, 15 parts of polyvinyl alcohol, 10 parts of acrylic acid, persulfate 0.1 part was reacted at a temperature of 90° C. for 4 hours to obtain a modified lignosulfonate aqueous solution.

Embodiment 2

[0033] Take 30 parts of lignosulfonate aqueous solution with a solid content of 20-40%, put it into the reaction kettle, stir and heat up to 60°C, then put in 5 parts of sodium dichromate, 10 parts of polyvinyl alcohol, 5 parts of acrylic acid, persulfate 1 part was reacted at a temperature of 90° C. for 5 hours to obtain a modified lignosulfonate aqueous solution.

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Abstract

This invention relates to preparation method of modified lignin poly carboxylic acid cement dispersant, belongs to concrete admixture. The process: whip amd heating-up lignin sulfonate to 50 to 80 deg, in turns add sodium dichromate 5 to 9 shares, polyvinyl alcohol 10 to 20 shares, acroleic acid 5 to 18 shares, initiator 0.1 to 3 shares, at temperature 80 to 100 deg, take reaction for 3 to 5 hours, gain modified lignin sulphonate water solution. The product brings the cement good consistency, not bleed air, without bleeding, good degree of fluidity and good flexibility.

Description

Technical field [0001] The invention relates to a preparation method of a cement dispersant, in particular to a preparation method for synthesizing a modified lignin polycarboxylate cement dispersant by using high molecular weight organic materials. Background technique [0002] Cement dispersant, also known as cement water reducer, can significantly reduce the amount of water added when mixing concrete after application, improve workability, and at the same time greatly improve the flowability and strength of concrete, thereby improving the quality of the project. Concrete is the most used building material in the world, and cement dispersant has become an essential additive in concrete production. At present, in developed countries and regions, the amount of cement dispersants in concrete accounts for more than 80%. [0003] Cement dispersants mainly include the following types: modified lignosulfonate water reducer; naphthalene sulfonate formaldehyde condensation product...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B24/26C04B24/04C04B103/40
CPCC04B2103/0083C04B2103/308C04B24/2641C04B2103/302C04B40/0046C04B2103/408C04B24/18C04B28/02C04B22/087C04B22/142C04B24/2623C04B24/2664C04B40/0028C04B40/0082
Inventor 李学平鲁爱国
Owner 武汉海德天物新材料有限公司
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