CN104446647B - Spray process based method for improving water resistance of magnesium oxychloride cement products - Google Patents
Spray process based method for improving water resistance of magnesium oxychloride cement products Download PDFInfo
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- CN104446647B CN104446647B CN201410667333.XA CN201410667333A CN104446647B CN 104446647 B CN104446647 B CN 104446647B CN 201410667333 A CN201410667333 A CN 201410667333A CN 104446647 B CN104446647 B CN 104446647B
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- Prior art keywords
- oxychloride cement
- phosphate
- solution containing
- magnesium oxychloride
- containing phosphate
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Abstract
The invention discloses a spray process based method for improving the water resistance of magnesium oxychloride cement products. The method comprises the following steps: S101. preparing a phosphorus-containing solution comprising one or more phosphate ions in monohydrogen phosphate, dihydrogen phosphate and orthophosphate; S102. spraying the phosphorus-containing solution onto the surfaces of the molded and demolded magnesium oxychloride cement products. The method has the beneficial effects that decomposition of hydration products of magnesium oxychloride cement can be delayed, and the water resistance of the magnesium oxychloride cement products can be improved; meanwhile, the setting time of the magnesium oxychloride cement paste can not be lengthened, the cohesion among the hydration products of magnesium oxychloride cement can not be weakened, and the strength of the products can not be affected.
Description
Technical field
The present invention relates to a kind of improvement technique of magnesium oxychloride cement product, more particularly to a kind of improvement chlorine based on spraying process
The method of oxygen magnesium cement product water-resistance.
Background technology
Magnesia oxychloride cement is a kind of special kinds cement, because it was invented in 1867 by Frenchman's Sorel (Sorel)
, so also known as Sorel cement.Meanwhile,, with magnesium oxide as main component, people are traditionally also called magnesia cement for it.Permitted
Multiple enterprises, people according to it with two kinds of magnesium compounds of magnesium oxide and magnesium chloride as primary raw material the characteristics of, simply referred to as double magnesium again
Cement.Usually, people are also accustomed to referred to as magnesite binding material, magnesia cement, because his primary raw material light-burning magnesium powder is to use
Giobertite calcining.
Water-resistance is the principal element for affecting magnesia oxychloride cement application.The main hydration products of magnesia oxychloride cement are easy in water
The characteristic of corrosion is restricted its application.Additive reduces can the erosion rate of hydrated product, to a certain extent
Improve the water-resistance of magnesia oxychloride cement.The additive often used in actual production can be divided into chemical admixture (predominantly phosphate
With sulfate etc.) and mineral admixture (flyash, slag, silicon ash) etc..Wherein phosphoric acid or phosphate improve the effect of water-resistance
It is water resistant additive the most frequently used at present better than sulfate.Usually, the phosphoric acid for measuring or phosphate are added to into salt
In (magnesium chloride) solution, after fully dissolving, mix with light-magnesite powder and other raw materials, stirring pulping, obtain chlorine oxygen magnesium
Cement slurry.According to user's request, magnesia oxychloride cement slurry is placed in mould the magnesite system for being prepared into different shape and purposes
Product.When magnesite product is produced, phosphoric acid or phosphatic addition are generally 0.5%～1% (quality point of light-magnesite powder
Number).When singly mixing 1% phosphoric acid or phosphate, the coefficient of softing that magnesium oxychloride cement product soaks at normal temperatures 28 days Jing after maintenance
More than 0.8 can be brought up to.If multiple p-doped acid (or phosphate) and mineral admixture in magnesia oxychloride cement, water-resistance can be more excellent
It is different.
When prior art improves the water-resistance of magnesia oxychloride cement using phosphoric acid or phosphate, on the one hand can cause the solidifying of slurry
Knot time lengthening, reduces on the other hand the mechanical properties such as the comprcssive strength of product.Particularly in cold winter, temperature meeting
It is reduced to less than 10 DEG C, and consecutive low temperature.When temperature is less than 10 DEG C, the setting time that magnesia oxychloride cement is starched only can significantly prolong
It is long, and add phosphoric acid or phosphate with this understanding and will further extend the setting time of slurry.Thus, winter low temperature meeting
Cause striking time when producing magnesite product to extend, or even slurry is hardened and is unable to form removal.Thus at present using phosphorus
Acid or phosphate can reduce production efficiency as the Technology of water repellent agent in the production process in winter even affects normal raw
Produce.
The content of the invention
In view of this, the invention provides a kind of method for improving magnesium oxychloride cement product water-resistance based on spraying process,
The method can delay the decomposition of magnesia oxychloride cement hydrated product, improve the water-resistance of magnesium oxychloride cement product；Will not prolong simultaneously
The setting time of long magnesia oxychloride cement slurry, the cohesive force between magnesia oxychloride cement hydrated product will not be weakened, that is, not interfered with
The intensity of product.
In order to reach above-mentioned goal of the invention, following technical scheme is present invention employs：
A kind of method for improving magnesium oxychloride cement product water-resistance based on spraying process, including step：
S101, solution containing phosphate is prepared, comprising in the hydrogen radical of phosphoric acid one, dihydrogen phosphate and orthophosphoric acid root in the solution containing phosphate
One or more phosphate anion；
S102, the surface that the solution containing phosphate is sprayed at the magnesium oxychloride cement product after shaping and demoulding.
Preferably, in the solution containing phosphate, the concentration of phosphate anion is 2ug/ml～1000mg/ml.
Preferably, in the solution containing phosphate, the concentration of phosphate anion is 2ug/ml～50mg/ml.
Preferably, in the solution containing phosphate, the concentration of phosphate anion is 50mg/ml～1000mg/ml.
Preferably, in the solution containing phosphate, the concentration of phosphate anion is 250mg/ml～1000mg/ml.
Preferably, in the solution containing phosphate, the concentration of phosphate anion is 50mg/ml～250mg/ml.
Preferably, the phosphorus source for preparing solution containing phosphate is selected from phosphoric acid, dibasic alkaliine, dihydric phosphate, orthophosphate
One or more.
Preferably, the solution containing phosphate is sprayed on the table of the magnesium oxychloride cement product after shaping and demoulding by spraying equipment
Face.
Preferably, the solution containing phosphate is applied in the table of the magnesium oxychloride cement product after shaping and demoulding by manual work
Face.
Compared with prior art, the use spraying process for providing in the embodiment of the present invention will contain P solution (phosphoric acid or phosphate)
The surface of magnesium oxychloride cement product is sprayed to, makes phosphate radical on the top layer of hydrated product (including article outer surface and internal holes table
Face) formed adsorption layer, and then with the Mg on hydrated product surface2+Mg-P coordinate bonds are formed, hydrated product surface Mg is reduced or eliminated2 +With extraneous H2O contacts and is formed the active site position of Mg-O keys, delays hydrated product to decompose so as to reach, and improves magnesia oxychloride cement system
The purpose of product water-resistance.
In addition, in the method, solution containing phosphate be after magnesia oxychloride cement shaping and demoulding just with the surface phase of hydrated product
Interaction, thus the hydration process of magnesia oxychloride cement is not interfered with, the setting time of slurry will not be extended；Also, solution containing P does not have
In being dispersed in magnesia oxychloride cement slurry, thus will not also be mingled with or adsorb between hydrated product, hydrated product will not be weakened
Between cohesive force, that is, do not interfere with the intensity of product.
Description of the drawings
Fig. 1 is the work of the method for improving magnesium oxychloride cement product water-resistance based on spraying process provided in an embodiment of the present invention
Skill flow chart.
Specific embodiment
Below in conjunction with accompanying drawing, with embodiment, the present invention will be further described.
Magnesium oxychloride cement product water-resistance is improved based on spraying process refering to what is provided in Fig. 1, this specific embodiment
Method includes step：
S101, solution containing phosphate is prepared, comprising in the hydrogen radical of phosphoric acid one, dihydrogen phosphate and orthophosphoric acid root in the solution containing phosphate
One or more phosphate anion.
S102, the surface that the solution containing phosphate is sprayed at the magnesium oxychloride cement product after shaping and demoulding.
Wherein, one of the phosphorus source of solution containing phosphate in phosphoric acid, dibasic alkaliine, dihydric phosphate, orthophosphate is prepared
Plant or various.
Wherein it is possible to the solution containing phosphate to be sprayed on the magnesium oxychloride cement product after shaping and demoulding by spraying equipment
Surface；The solution containing phosphate can also be applied in the surface of the magnesium oxychloride cement product after shaping and demoulding by manual work.
After being improved to the water-resistance of magnesium oxychloride cement product according to above method, the softening system of magnesium oxychloride cement product
Number is increased substantially, it might even be possible to improve more than 100%.
Embodiment 1
(1) solution containing phosphate is prepared.The phosphorus source that solution containing phosphate is prepared in the present embodiment is phosphoric acid, prepares phosphate anion
Concentration is the solution containing phosphate of 2ug/ml.
(2) by magnesia oxychloride cement aquation and it is shaped to the product with concrete shape.The raw material of wherein magnesia oxychloride cement is matched somebody with somebody
Than for activity MgO:MgCl2:H2O=7:1:15.
(3) it is the solution containing phosphate of 2ug/ml by phosphorus acid ion concentration after magnesium oxychloride cement product shaping and demoulding, passes through
Spraying equipment is sprayed on the surface of magnesium oxychloride cement product, dries.
(4) when the product dried in step (3) being soaked into 24 in 65 DEG C of water-bath, coefficient of softing is measured for 0.46.Make
It is 0.32 without the coefficient of softing of the product of spraying solution containing phosphate under similarity condition for contrast.Thus, spray according to the present embodiment
The coefficient of softing for applying magnesium oxychloride cement product after solution containing phosphate improves 43.8%.
Embodiment 2
(1) solution containing phosphate is prepared.The phosphorus source that solution containing phosphate is prepared in the present embodiment is potassium dihydrogen phosphate, prepares phosphoric acid
Ion concentration is the solution containing phosphate of 50ug/ml.
(2) by magnesia oxychloride cement aquation and it is shaped to the product with concrete shape.The raw material of wherein magnesia oxychloride cement is matched somebody with somebody
Than for activity MgO:MgCl2:H2O=7:1:15.
(3) it is the solution containing phosphate of 50ug/ml by phosphorus acid ion concentration after magnesium oxychloride cement product shaping and demoulding, leads to
The surface that manual work is applied in magnesium oxychloride cement product is crossed, is dried.
(4) when the product dried in step (3) being soaked into 24 in 65 DEG C of water-bath, coefficient of softing is measured for 0.60.With
Compare without the product of spraying solution containing phosphate under similarity condition, according to magnesium oxychloride cement product after the present embodiment spraying solution containing phosphate
Coefficient of softing improve 87.5%.
Embodiment 3
(1) solution containing phosphate is prepared.The phosphorus source that solution containing phosphate is prepared in the present embodiment is dipotassium hydrogen phosphate, prepares phosphoric acid
Ion concentration is the solution containing phosphate of 50mg/ml.
(2) by magnesia oxychloride cement aquation and it is shaped to the product with concrete shape.The raw material of wherein magnesia oxychloride cement is matched somebody with somebody
Than for activity MgO:MgCl2:H2O=7:1:15.
(3) it is the solution containing phosphate of 50mg/ml by phosphorus acid ion concentration after magnesium oxychloride cement product shaping and demoulding, leads to
The surface that spraying equipment is sprayed on magnesium oxychloride cement product is crossed, is dried.
(4) when the product dried in step (3) being soaked into 24 in 65 DEG C of water-bath, coefficient of softing is measured for 0.66.With
Compare without the product of spraying solution containing phosphate under similarity condition, according to magnesium oxychloride cement product after the present embodiment spraying solution containing phosphate
Coefficient of softing improve 106.3%.
Embodiment 4
(1) solution containing phosphate is prepared.The phosphorus source that solution containing phosphate is prepared in the present embodiment is tripotassium phosphate, prepares phosphate radical
Ion concentration is the solution containing phosphate of 1000mg/ml.
(2) by magnesia oxychloride cement aquation and it is shaped to the product with concrete shape.The raw material of wherein magnesia oxychloride cement is matched somebody with somebody
Than for activity MgO:MgCl2:H2O=7:1:15.
(3) after magnesium oxychloride cement product shaping and demoulding, by the solution containing phosphate that phosphorus acid ion concentration is 1000mg/ml,
The surface of magnesium oxychloride cement product is sprayed on by spraying equipment, is dried.
(4) when the product dried in step (3) being soaked into 24 in 65 DEG C of water-bath, coefficient of softing is measured for 0.63.With
Compare without the product of spraying solution containing phosphate under similarity condition, according to magnesium oxychloride cement product after the present embodiment spraying solution containing phosphate
Coefficient of softing improve 96.9%.
Embodiment 5
(1) solution containing phosphate is prepared.The phosphorus source that solution containing phosphate is prepared in the present embodiment is potassium dihydrogen phosphate and dipotassium hydrogen phosphate
Mixture (can mix according to arbitrary proportion), prepare phosphorus acid ion concentration be 250mg/ml solution containing phosphate.
(2) by magnesia oxychloride cement aquation and it is shaped to the product with concrete shape.The raw material of wherein magnesia oxychloride cement is matched somebody with somebody
Than for activity MgO:MgCl2:H2O=7:1:15.
(3) it is the solution containing phosphate of 250mg/ml by phosphorus acid ion concentration after magnesium oxychloride cement product shaping and demoulding, leads to
The surface that spraying equipment is sprayed on magnesium oxychloride cement product is crossed, is dried.
(4) when the product dried in step (3) being soaked into 24 in 65 DEG C of water-bath, coefficient of softing is measured for 0.52.With
Compare without the product of spraying solution containing phosphate under similarity condition, according to magnesium oxychloride cement product after the present embodiment spraying solution containing phosphate
Coefficient of softing improve 62.5%.
It should be noted that in the embodiment more than, the proportioning raw materials of magnesia oxychloride cement are active MgO:MgCl2:
H2O=7:1:15, here is merely illustrative of, and should not be construed as limitation of the invention.The method that the present invention is provided also is used
In the magnesia oxychloride cement of other proportioning raw materials.
In sum, compared with prior art, the use spraying process for providing in the embodiment of the present invention will contain P solution (phosphoric acid
Or phosphate) spray to the surface of magnesium oxychloride cement product, make phosphate radical hydrated product top layer (including article outer surface and
Inner bore surface) formed adsorption layer, and then with the Mg on hydrated product surface2+Mg-P coordinate bonds are formed, aquation product is reduced or eliminated
Thing surface Mg2+Ion and external world H2O contacts and is formed the active site position of Mg-O keys, delays hydrated product to decompose so as to reach, and changes
The purpose of kind magnesium oxychloride cement product water-resistance.
In addition, in the method, solution containing phosphate be after magnesia oxychloride cement shaping and demoulding just with the surface phase of hydrated product
Interaction, thus the hydration process of magnesia oxychloride cement is not interfered with, the setting time of slurry will not be extended；Also, solution containing P does not have
In being dispersed in magnesia oxychloride cement slurry, thus will not also be mixed between hydrated product, will not weaken between hydrated product
Cohesive force, that is, do not interfere with the intensity of product.
The above is only the specific embodiment of the application, it is noted that for the ordinary skill people of the art
For member, on the premise of without departing from the application principle, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as the protection domain of the application.
Claims (8)
1. a kind of method for improving magnesium oxychloride cement product water-resistance based on spraying process, it is characterised in that including step：
S101, solution containing phosphate is prepared, comprising in the hydrogen radical of phosphoric acid one, dihydrogen phosphate and orthophosphoric acid root in the solution containing phosphate
Plant or various phosphate anions；Prepare one of the phosphorus source of solution containing phosphate in dibasic alkaliine, dihydric phosphate, orthophosphate
Plant or various；
S102, the surface that the solution containing phosphate is sprayed at the magnesium oxychloride cement product after shaping and demoulding.
2. the method for improving magnesium oxychloride cement product water-resistance based on spraying process according to claim 1, its feature exists
In in the solution containing phosphate, the concentration of phosphate anion is 2ug/ml～1000mg/ml.
3. the method for improving magnesium oxychloride cement product water-resistance based on spraying process according to claim 1, its feature exists
In in the solution containing phosphate, the concentration of phosphate anion is 2ug/ml～50mg/ml.
4. the method for improving magnesium oxychloride cement product water-resistance based on spraying process according to claim 1, its feature exists
In in the solution containing phosphate, the concentration of phosphate anion is 50mg/ml～1000mg/ml.
5. the method for improving magnesium oxychloride cement product water-resistance based on spraying process according to claim 1, its feature exists
In in the solution containing phosphate, the concentration of phosphate anion is 250mg/ml～1000mg/ml.
6. the method for improving magnesium oxychloride cement product water-resistance based on spraying process according to claim 1, its feature exists
In in the solution containing phosphate, the concentration of phosphate anion is 50mg/ml～250mg/ml.
7. the method for improving magnesium oxychloride cement product water-resistance based on spraying process according to claim 1, its feature exists
In the solution containing phosphate to be sprayed on the surface of the magnesium oxychloride cement product after shaping and demoulding by spraying equipment.
8. the method for improving magnesium oxychloride cement product water-resistance based on spraying process according to claim 1, its feature exists
In the solution containing phosphate to be applied in the surface of the magnesium oxychloride cement product after shaping and demoulding by manual work.
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| CN201410667333.XA CN104446647B (en) | 2014-11-20 | 2014-11-20 | Spray process based method for improving water resistance of magnesium oxychloride cement products |
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| CN201410667333.XA CN104446647B (en) | 2014-11-20 | 2014-11-20 | Spray process based method for improving water resistance of magnesium oxychloride cement products |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4352694A (en) * | 1980-07-18 | 1982-10-05 | Norcem A.S. | Process of producing sorel cement |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1010406B (en) * | 1988-02-10 | 1990-11-14 | 湖南大学 | Magnesium oxychoride cement and magnesite concrete of good water-proofness |
| CN1070627A (en) * | 1991-09-16 | 1993-04-07 | 山东省新材料研究所 | Modified magnesium oxychloride cement and goods thereof |
| CN1073058C (en) * | 1998-11-20 | 2001-10-17 | 中国科学院上海硅酸盐研究所 | Inorganic and flame-retardant type composite slab and method for mfg. same |
| PL1923374T3 (en) * | 2006-11-16 | 2010-03-31 | Lafarge Sa | Process for treating concrete |
| CN101007725B (en) * | 2007-01-29 | 2010-05-19 | 南京上博科技实业有限公司 | Water-resistant chlorine oxygen magnesium silicon series composite material and its preparing process |
| CN102757256A (en) * | 2012-07-18 | 2012-10-31 | 公安部四川消防研究所 | Incombustible organic/inorganic porous waterproof thermal-insulation composite material and preparation method thereof |
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2014
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4352694A (en) * | 1980-07-18 | 1982-10-05 | Norcem A.S. | Process of producing sorel cement |
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