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
CN100453493CInactive Publication Date: 2009-01-21武汉海德天物新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
武汉海德天物新材料有限公司
Publication Date
2009-01-21
Estimated Expiration
Not applicable · inactive patent

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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.
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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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