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Synthesis and Application of Amide Polyether Sulfonate Sodium Macromolecule for Mold Gypsum Reinforcement

A technology of sodium polyether sulfonate and macromolecules, applied in the field of materials, can solve the problems of unfavorable mechanical strength of gypsum, reduce the water absorption of molds, reduce the strength of gypsum, etc., and achieve the effects of improving the strength of gypsum, reducing the production cost, and reducing the cost of raw materials

Active Publication Date: 2018-10-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the strength and water absorption of gypsum molds are actually a pair of contradictions, and the water-to-plaster ratio used in β-hemihydrate gypsum is very high, the effect of traditional additives for water reduction and enhancement in gypsum is not good, and may even reduce the strength of gypsum , especially under the premise of maintaining the strength, the water absorption of the mold will be greatly reduced; and most of the polycarboxylic acid macromolecules contain carboxylic acid groups in their molecular structures, resulting in serious retarding effects. In the case of high water paste ratio The mechanical strength of gypsum is often adversely affected under the

Method used

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  • Synthesis and Application of Amide Polyether Sulfonate Sodium Macromolecule for Mold Gypsum Reinforcement
  • Synthesis and Application of Amide Polyether Sulfonate Sodium Macromolecule for Mold Gypsum Reinforcement
  • Synthesis and Application of Amide Polyether Sulfonate Sodium Macromolecule for Mold Gypsum Reinforcement

Examples

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Embodiment 1

[0020] Using ammonium persulfate as the initiator, three monomers, sodium methacryl sulfonate, methylalkenyl polyoxyethylene polyoxypropylene ether, and N-methylol acrylamide in a molar ratio of 2:6:10, were prepared in At 80°C, the water-phase free radical reaction was carried out for 7h to end. After the product is cooled, it is neutralized with NaOH with a mass fraction of 30% until the pH is 7, and the amide polyether sodium sulfonate macromolecule of the present invention can be obtained. Wherein, the initiator consumption is 0.7%.

[0021] The amide type polyether sodium sulfonate macromolecule synthesized above is added to the required water demand calculated according to the water-to-paste ratio of 0.7 with 0.15% of the gypsum mass to prepare a solution, and the β-hemihydrate gypsum is mixed within 2 minutes. Slowly and evenly add to this solution, and then stand for 1min before making a gypsum mold test piece, remove the mold after final setting, store at room temper...

Embodiment 2

[0026] Using ammonium persulfate as the initiator, three monomers, sodium methacryl sulfonate, methylalkenyl polyoxyethylene polyoxypropylene ether, and N-methylol acrylamide, in a molar ratio of 2:8:15 were prepared in At 80°C, the free radical reaction in water phase was carried out for 8h to end. After the product is cooled, it is neutralized with NaOH with a mass fraction of 30% until the pH is 7, and the amide polyether sodium sulfonate macromolecule of the present invention can be obtained. Wherein, the initiator consumption is 0.6%.

[0027]The amide type polyether sodium sulfonate macromolecule synthesized above is added to the required water demand calculated according to the water-to-paste ratio of 0.7 with 0.15% of the gypsum mass to prepare a solution, and the β-hemihydrate gypsum is mixed within 2 minutes. Slowly and evenly add to this solution, and then stand for 1min before making a gypsum mold test piece, remove the mold after final setting, store at room temp...

Embodiment 3

[0033] Using ammonium persulfate as an initiator, three monomers, sodium methacryl sulfonate, methylalkenyl polyoxyethylene polyoxypropylene ether, and N-methylol acrylamide, in a molar ratio of 2:10:20 were used in The free radical reaction in water phase was carried out at 90°C for 8h to end. After the product is cooled, it is neutralized with NaOH with a mass fraction of 30% until the pH is 7, and the amide polyether sodium sulfonate macromolecule of the present invention can be obtained. Wherein, the initiator consumption is 0.4%.

[0034] The amide type polyether sodium sulfonate macromolecule synthesized above is added to the required water demand calculated according to the water-to-paste ratio of 0.7 with 0.15% of the gypsum mass to prepare a solution, and the β-hemihydrate gypsum is mixed within 2 minutes. Slowly and evenly add to this solution, and then stand for 1min before making a gypsum mold test piece, remove the mold after final setting, store at room temperat...

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Abstract

The present invention discloses a formula, synthesis and application of amide-type polyether sodium sulfonate macromolecules. A small amount of the product is added into beta gypsum to replace the conventionally used mixed alpha and beta gypsum to produce a gypsum mould . Even at a high water-gypsum ratio, the strength of the mould gypsum can be improved while the demand on water absorption of the gypsum mould is ensured, so that the cost of gypsum raw materials is lowered, and the number of use of the gypsum mould is improved.

Description

【Technical field】 [0001] The invention relates to the synthesis and application of an amide polyether sodium sulfonate macromolecule used for mold gypsum reinforcement, and belongs to the field of material technology. 【Background technique】 [0002] Gypsum is widely used in ceramics and other industries due to its advantages such as abundant raw materials, low production cost, environmental protection, and good plasticity. However, when preparing gypsum molds, the actual water consumption is far greater than the theoretical hydration water demand, resulting in the fatal weakness of low strength, easy damage, poor quality, and short service life of gypsum molds. With the gradual development of the ceramic industry in the direction of mechanized and automated production, the domestic demand for plaster molds is increasing, and the quality requirements are also higher. Compared with the method of mixing high-priced and high-quality α-hemihydrate gypsum and cheap and inferior β...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/38C08F220/58C04B24/16
Inventor 夏咏梅吴华春方云
Owner JIANGNAN UNIV
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