CN104672412A - Exploration on synthesis process of melamine water reducing agent - Google Patents
Exploration on synthesis process of melamine water reducing agent Download PDFInfo
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- CN104672412A CN104672412A CN201310634637.1A CN201310634637A CN104672412A CN 104672412 A CN104672412 A CN 104672412A CN 201310634637 A CN201310634637 A CN 201310634637A CN 104672412 A CN104672412 A CN 104672412A
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- reducing agent
- water reducing
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- urea
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Abstract
The invention relates to exploration on a synthesis process of a melamine-series water reducing agent. The melamine water reducing agent is prepared from melamine, urine, formaldehyde, sodium hydrogen sulfite and sodium hydroxide through four steps, namely a hydroxymethylation reaction stage, a sulfonation reaction stage, a condensation reaction stage, a reforming stage and the like. The melamine water reducing agent disclosed by the invention, as a dispersant, can be applied to Portland cement and can be used for preparing a finished gypsum product as well; and the melamine water reducing agent has good application prospect in concrete engineering.
Description
Technical field
The synthesis technique that the present invention relates to a kind of melamine class water reducer is probed into, and belongs to chemical technology field.
Background of invention
High efficiency water reducing agent is the requisite component of preparation high performance concrete, has become the focus of research and development.Current domestic water reducer used is mainly main with naphthalene, but naphthalene water reducer is by the restriction of structure, cannot fundamentally improve concrete slump retaining performance.In addition, because raw naphthalene material is comparatively in short supply, thus with naphthalene be the water reducer price of raw material in sustainable growth, therefore, development of new high efficiency water reducing agent has great significance.The present invention relates to probing into of a kind of melamine system water reducer synthesis technique.Melamine water reducing agent is a kind of water miscible polymer resin, and it obviously can improve concrete multiple performance, compared with general cement water reducing agent, has that additional water reducer compatibility with other is bad, not slow setting, the early feature such as remarkably productive by force.The melamine water reducing agent that the present invention relates to has following characteristics: colourless, can be used for silicate cement, also can be used for plastering as dispersion agent, has good application prospect in concrete works.
The present invention relates to a kind of exploration of synthesis technique of melamine system water reducer, the melamine water reducing agent of preparation is colourless, can be used for silicate cement, also can be used for plastering as dispersion agent, has good application prospect in concrete works.
Summary of the invention
The synthesis technique that the present invention relates to a kind of melamine water reducing agent is explored, and the melamine water reducing agent of preparation not only can be used for silicate cement, also can be used for plastering, has good application prospect in concrete works.
In order to achieve the above object, this invention takes following technical scheme:
Relate to an exploration for the synthesis technique of polycarboxylate water-reducer, be made up of following raw material:
Raw material is preferably from trimeric cyanamide, urea, formaldehyde, sodium bisulfite, sodium hydroxide.
Its preferred synthesis technique is as follows:
Quantitative formaldehyde, trimeric cyanamide and urea are dropped in three-necked bottle, add a certain amount of deionized water, regulation system pH value is between 9 ~ 12, specified temp is increased under stirring state, just melamine methylol and hydroxymethyl urea can be generated, after generating above-mentioned product, add sodium bisulfite in proportion, continue regulation system pH value between 9 ~ 12, a certain amount of acid solution is added after there is sulfonation reaction, under the katalysis of acid, sulfonation melamine methylol monomer and sulfonation hydroxymethyl urea by intermolecular dehydration, linear synthesized high molecular polymer.After condensation product is cooled to normal temperature, continue to regulate pH between 9 ~ 12, heating and heat preservation, just can obtain water white melamine system water reducer solution.
In above-mentioned preferred system, the mol ratio of urea and trimeric cyanamide is 0.2 ~ 2.0, both formaldehyde consumption and urea and trimeric cyanamide total amount mol ratio is 2.0 ~ 3.5, both sulfonated reagent sodium bisulfite and urea and trimeric cyanamide total amount mol ratio is 0.8 ~ 1.5, in system preparation process, temperature controls at 50 ~ 80 DEG C, and system pH controls between 9 ~ 12.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described, but be not limited only to this.
Embodiment 1:
One relates to melamine system water reducer and explores, and its preparation method is as follows:
30 parts, urea, trimeric cyanamide 30 parts, 120 parts, formaldehyde, sodium bisulfite 50 parts, in system preparation process, temperature controls at 65 DEG C.Concrete preparation method is as follows:
Above-mentioned quantitative formaldehyde, trimeric cyanamide and urea are dropped in three-necked bottle, add a certain amount of deionized water, regulation system pH value is 11, under stirring state, control temperature is at 65 DEG C, just melamine methylol and hydroxymethyl urea can be generated, after generating above-mentioned product, add sodium bisulfite in proportion, continuing regulation system pH value is 10, a certain amount of acid solution is added after there is sulfonation reaction, under the katalysis of acid, sulfonation melamine methylol monomer and sulfonation hydroxymethyl urea by intermolecular dehydration, linear synthesized high molecular polymer.After condensation product is cooled to normal temperature, regulate pH to be 12, heating and heat preservation, just can obtain water white melamine system water reducer solution.
Embodiment 2:
One relates to melamine system water reducer and explores, and its preparation method is as follows:
45 parts, urea, trimeric cyanamide 45 parts, 100 parts, formaldehyde, sodium bisulfite 60 parts, in system preparation process, temperature controls at 65 DEG C.Concrete preparation method is as embodiment 1.
Embodiment 3:
One relates to melamine system water reducer and explores, and its preparation method is as follows:
55 parts, urea, trimeric cyanamide 30 parts, 120 parts, formaldehyde, sodium bisulfite 30 parts, in system preparation process, temperature controls at 75 DEG C.Concrete preparation method is as embodiment 1.
Embodiment 4:
One relates to melamine system water reducer and explores, and its preparation method is as follows:
60 parts, urea, trimeric cyanamide 60 parts, 100 parts, formaldehyde, sodium bisulfite 30 parts, in system preparation process, temperature controls at 75 DEG C.Concrete preparation method is as embodiment 1.
Above-described embodiment is only and clearly the invention example is described, and the restriction not to the invention embodiment.For those of ordinary skill in the field, other multi-form change and variations can also be made on the basis of the above description.Here exhaustive without the need to also giving all embodiments.
Claims (4)
1. relate to an exploration for the synthesis technique of melamine water reducing agent, it is characterized in that:
Relate to an exploration for the synthesis technique of polycarboxylate water-reducer, be made up of following raw material:
Raw material is preferably from trimeric cyanamide, urea, formaldehyde, sodium bisulfite, sodium hydroxide.
2. in melamine water reducing agent system building-up process according to claim 1, the mol ratio of urea and trimeric cyanamide is 0.2 ~ 2.0, both formaldehyde consumption and urea and trimeric cyanamide total amount mol ratio is 2.0 ~ 3.5, and both sulfonated reagent S-WAT and urea and trimeric cyanamide total amount mol ratio is 0.8 ~ 1.5.
3. in melamine water reducing agent preparation process according to claim 1, temperature controls at 50 ~ 80 DEG C.
4. in melamine water reducing agent preparation process according to claim 1, system pH controls between 9 ~ 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310634637.1A CN104672412A (en) | 2013-12-02 | 2013-12-02 | Exploration on synthesis process of melamine water reducing agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310634637.1A CN104672412A (en) | 2013-12-02 | 2013-12-02 | Exploration on synthesis process of melamine water reducing agent |
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| Publication Number | Publication Date |
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| CN104672412A true CN104672412A (en) | 2015-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310634637.1A Pending CN104672412A (en) | 2013-12-02 | 2013-12-02 | Exploration on synthesis process of melamine water reducing agent |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105820300A (en) * | 2016-03-15 | 2016-08-03 | 苏州市兴邦化学建材有限公司 | Synthesis method of melamine water reducer for desulfurized gypsum |
-
2013
- 2013-12-02 CN CN201310634637.1A patent/CN104672412A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105820300A (en) * | 2016-03-15 | 2016-08-03 | 苏州市兴邦化学建材有限公司 | Synthesis method of melamine water reducer for desulfurized gypsum |
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Application publication date: 20150603 |