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

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

Inactive Publication Date: 2007-11-14
武汉海德天物新材料有限公司
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  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes how an alkaline chemical called Ligno Sulfone acid (LSA) was added during polymer preparation when making plaster reinforced concretes. These modifications resulted in better properties such as reducing shrink rates, increasing water absorption capacity, controllable emulsions, less gas entraining, reduced settling, prevention of excess flowback, long-lasting stability under environmental conditions like temperature changes, resistance against corrosion, and ability to mix well together other ingredients easily. Overall these improvements led to higher efficiency and quality concrete compositions containing this type of material.

Problems solved by technology

Waterproof reinforced plaster (SHP) flooring material made up mainly of alkali metal salts like calcium sulfoacuminate and ammoniacalciplex(NH2)2SO4), while solving these issues relating to improving durable properties including moisture retention, crack reduction during construction work, improved early strength development, delayed setting times, increased thickness upon curing without excessive shrinkages, less separation during usage, environmental concerns associated with volatile organics substances, and difficulty in mixing ingredients efficiently.

Method used

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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

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Claims

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Application Information

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Owner 武汉海德天物新材料有限公司
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