Water-resistant low-ice-adhesion magnesium oxychloride cement and preparation method thereof

Abstract

The invention belongs to the technical field of inorganic cementing materials, and particularly relates to water-resistant low-ice-adhesion magnesium oxychloride cement and a preparation method thereof. The water-resistant low-ice-adhesion magnesium oxychloride cement is mainly prepared from the following raw materials in parts by weight: 80-120 parts of light calcined magnesia, 40-60 parts of magnesium chloride, 30-40 parts of water and 2-10 parts of organic silicon, and the organic silicon is polysiloxane with a reactive group on a side chain or / and polysiloxane with a reactive group on an end base. The magnesium oxychloride cement is subjected to surface modification and overall modification by adopting the organic silicon material with liquid-like property, so that the water resistance of the magnesium oxychloride cement is improved, and the magnesium oxychloride cement is endowed with low ice adhesion property.

Description

Technical Field

[0001] The invention belongs to the technical field of inorganic gelling materials, and particularly relates to a magnesium oxychloride cement with water resistance and low ice adhesion and a preparation method thereof. Background Art

[0002] MgO is one of the main raw materials for magnesium oxychloride cement, primarily derived from calcined magnesite and dolomite. China is the world's largest producer and reserver of magnesite, possessing abundant resources. According to statistics, China's magnesite reserves account for approximately 29% of the world's total, ranking first globally. MgCl2, another raw material for magnesium oxychloride cement, can be obtained from bischofite in salt lakes under natural sunlight conditions, requiring no complex processing. However, in western my country, significant amounts of MgCl2 are produced as a byproduct during the potassium extraction process from salt lakes, making it a key source of MgCl2 in my country.

[0003] Existing magnesium oxychloride cement has very obvious defects, especially poor water resistance. Under conditions of high humidity, it is easy to experience the phenomenon of brine frost, resulting in warping and deformation, which seriously limits the development and application of magnesium oxychloride cement. Improving the water resistance of magnesium oxychloride cement is conducive to expanding the scope of use of magnesium oxychloride cement. At present, the water resistance of magnesium oxychloride cement is mainly modified by adding admixtures such as phosphoric acid and phosphates to magnesium oxychloride cement. However, after adding admixtures such as phosphoric acid and phosphates, the frost resistance of magnesium oxychloride cement may be reduced. Under low temperature conditions, phosphates may react with magnesium ions in cement to form crystals, resulting in an increase in the porosity of the cement, thereby reducing the frost resistance.

[0004] Since magnesium oxychloride cement has not yet been widely used in engineering, research on its anti-icing and de-icing properties is relatively limited. However, magnesium oxychloride cement is also a concrete material with a similar structure, so reference can be made to research on commonly used Portland cement concrete materials, hereinafter collectively referred to as concrete materials. Concrete, due to its advantages such as high strength, low cost, durability, and excellent plasticity, has gradually become the most widely used building material in the world since its introduction. However, its inherent hydrophilicity and porous structure make cement-based materials susceptible to water intrusion. In cold regions, freezing and thawing of water in the pores of concrete can cause expansion and cracking. Ice on roads increases traffic risks, and ice and snow accumulation on building surfaces increases deadweight, endangering building safety. Currently, most countries still use traditional de-icing methods to remove ice from concrete surfaces. These methods include mechanical de-icing and chemical de-icing. While easy to operate, these methods suffer from low de-icing efficiency, high costs, and potential environmental pollution. Therefore, preventing water intrusion into concrete and reducing the adhesion strength of ice on the concrete surface to facilitate ice removal are of great economic significance.

[0005] In view of existing research, the purpose of the present invention is to solve the problem of poor water resistance of magnesium oxychloride cement, while giving magnesium oxychloride cement the property of low ice adhesion, expanding the application range of magnesium oxychloride cement, and simplifying the preparation process to facilitate its promotion and application. Summary of the Invention

[0006] In view of the problems and shortcomings in the prior art, the object of the present invention is to provide a water-resistant and low-ice adhesion magnesium oxychloride cement and a preparation method thereof.

[0007] Based on the above purpose, the present invention adopts the following technical solutions:

[0008] The first aspect of the present invention provides a water-resistant and low-ice-adhesion magnesium oxychloride cement, which is mainly composed of the following raw materials in parts by weight: 80-120 parts of light-burned magnesium oxide, 40-60 parts of magnesium chloride, 30-40 parts of water, and 2-10 parts of organic silicon;

[0009] The organosilicon is a polysiloxane with a reactive group on the side chain and / or a polysiloxane with a reactive group on the terminal group.

[0010] Preferably, the polysiloxane with reactive groups on the side chains is a polysiloxane composition with R1 reactive groups and R2 reactive groups, R1 and R2 appear in pairs and are selected from one of the following corresponding combinations: silicon hydrogen group and silicon vinyl group, methylamino group and carboxyl group, mercapto group and vinyl group, hydroxyl group and epoxy group, hydroxyl group and isocyanate group, amino group and isocyanate group, mercapto group and hydroxyl group, hydroxyl group and cyano group, amino group and carboxyl group.

[0011] Preferably, the polysiloxane with reactive groups in the side chains is a polysiloxane composition containing silicon hydrogen groups and silicon vinyl groups, which are trimethylsiloxy-terminated methyl hydrogen siloxane-dimethyl siloxane copolymer and trimethylsiloxy-terminated vinyl methyl siloxane-dimethyl siloxane copolymer, wherein the trimethylsiloxy-terminated methyl hydrogen siloxane-dimethyl siloxane copolymer can be represented by the structural formula:

[0012] wherein m is 600-800, n is 5-8, i.e. the molar percentage of methyl hydrogen siloxane in the copolymer is 0.5%-1.5%; the weight average molecular weight range is 45000-60000 g / mol;

[0013] The trimethylsiloxy-terminated vinylmethylsiloxane-dimethylsiloxane copolymer can be represented by the structural formula:

[0014] wherein m is 150-500, and n is 1-5, namely the molar percentage of vinylmethylsiloxane in the copolymer is 0.8%-1.2%; and the weight average molecular weight is 12000 g / mol.

[0015] Preferably, the polysiloxane with reactive end groups is a double-terminal vinyl polydimethylsiloxane, which can be represented by the structural formula:

[0016] Its weight average molecular weight is 22000 g / moL.

[0017] Preferably, the mass of the double-ended vinyl polydimethylsiloxane is 40% to 70% of the sum of the mass of the trimethylsiloxy-terminated methylhydrogensiloxane-dimethylsiloxane copolymer and the trimethylsiloxy-terminated vinylmethylsiloxane-dimethylsiloxane copolymer; the mass ratio of the trimethylsiloxy-terminated methylhydrogensiloxane-dimethylsiloxane copolymer to the trimethylsiloxy-terminated vinylmethylsiloxane-dimethylsiloxane copolymer is 7:3 to 9:1.

[0018] Preferably, the mass ratio of the trimethylsiloxy-terminated methylhydrogensiloxane-dimethylsiloxane copolymer, the trimethylsiloxy-terminated vinylmethylsiloxane-dimethylsiloxane copolymer, and the double-terminated vinyl polydimethylsiloxane is 9:1:6.67.

[0019] Preferably, the light-burned magnesium oxide is prepared by calcining magnesite at 850° C., has an activity index of 60% to 70%, and a magnesium oxide content of 80% to 95%.

[0020] Preferably, the magnesium chloride is magnesium chloride hexahydrate, with a MgCl2·6H2O content of ≥98% and a pH value of 5.0-6.5.

[0021] Preferably, the magnesium oxychloride cement comprises low ice adhesion.

[0022] The second aspect of the present invention provides a method for preparing the water-resistant and low-ice-adhesion magnesium oxychloride cement according to the first aspect, comprising the following steps:

[0023] (1) dissolving magnesium chloride in water and mixing uniformly to obtain a first solution;

[0024] (2) mixing the organosilicon uniformly to obtain a second solution;

[0025] (3) uniformly mixing the first solution and the second solution to obtain a third solution;

[0026] (4) adding light-burned magnesium oxide to the third solution and mixing them uniformly to obtain magnesium oxychloride cement mortar;

[0027] (5) injecting the slurry obtained in step (4) into a mold, vibrating it, and demoulding it after curing for a period of time;

[0028] (6) After demoulding, magnesium oxychloride cement with water resistance and low ice adhesion is obtained by curing for a period of time.

[0029] Preferably, in step (3), the first solution and the second solution are mixed uniformly under stirring at 300 r / min for 5 min to obtain the third solution.

[0030] Preferably, in step (5), the curing temperature is (20±2)° C., the humidity is (60±5)%, and the curing time is 24 h.

[0031] Preferably, in step (5), the curing temperature is (20±2)°C, the curing humidity is (60±5)%, and the curing time is 28 days.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention uses an organosilicon material with liquid-like properties to perform surface and overall modification on magnesium oxychloride cement. The organosilicon is polydimethylsiloxane with reactive groups on the side chains and polydimethylsiloxane with reactive groups on the terminal groups. This improves the water resistance of magnesium oxychloride cement and imparts low ice adhesion to the cement. This is because the cured and cross-linked polydimethylsiloxane backbone provides stability, while the polydimethylsiloxane side chains form liquid-like polymer brushes on the surface. These polymer brushes are highly flexible, giving the coating liquid-like properties and low adhesion to the surface, thereby promoting the shedding of various organic and aqueous liquids and solid attachments without being affected by surface tension.

[0034] 2. Traditional methods for improving the water resistance of magnesium oxychloride cement mostly rely on powdered inorganic additives, but excessive addition of powder can easily cause difficulty in mixing magnesium oxychloride cement mortar, cracking and deformation of samples, etc., and the introduction of powdered inorganic additives cannot improve the anti-icing performance of magnesium oxychloride cement. In contrast, many organic additives can give magnesium oxychloride cement excellent water-repellent and anti-icing properties while improving the water resistance of magnesium oxychloride cement. Currently, most organic additive modifications focus on the preparation of super-hydrophobic magnesium oxychloride cement, but the construction of super-hydrophobic structure requires the surface of magnesium oxychloride cement to be treated to give it a certain micro-nano structure, and the destruction of the rough structure may cause it to lose its super-hydrophobicity, which undoubtedly increases the cost of modification. Liquid-like surface materials do not need to construct micro-nano structures to achieve water-repellent and low-adhesion properties. Applying liquid-like surface materials to the water-resistant modification of magnesium oxychloride cement can not only make magnesium oxychloride cement water-repellent and improve its water-resistant shortcomings, but also provide magnesium oxychloride cement with low ice adhesion properties, expanding the application range of magnesium oxychloride cement. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The compressive strength of the modified magnesium oxychloride cement M10 of the present invention is (a) before immersion in water; (b) after immersion in water for 7 days;

[0036] Figure 2is the softening coefficient of the modified magnesium oxychloride cement M10 of the present invention;

[0037] Figure 3 SEM of the modified magnesium oxychloride cement of the present invention (a) M0; (b) M2; (c) M4; (d) M6; (e) M8; (f) M10;

[0038] Figure 4 is the ice adhesion strength of the modified magnesium oxychloride cement M10 of the present invention;

[0039] Figure 5 is the ice adhesion strength of unmodified magnesium oxychloride cement, i.e., original magnesium oxychloride cement;

[0040] Figure 6 The ice adhesion strength change of the modified magnesium oxychloride cement M10 after freeze-thaw cycles. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] (1) Sample preparation

[0043] Example 1

[0044] The invention discloses a magnesium oxychloride cement with water resistance and low ice adhesion, which is mainly composed of the following raw materials in parts by weight: 100 parts of light-burned magnesium oxide, 48 parts of magnesium chloride, 35 parts of water and 2 parts of organic silicon.

[0045] Silicone is a combination of the following three polysiloxanes:

[0046] The mass ratio of trimethylsiloxy-terminated methylhydrogensiloxane-dimethylsiloxane copolymer (material information see Table 1), trimethylsiloxy-terminated vinylmethylsiloxane-dimethylsiloxane copolymer (material information see Table 2), and double-terminated vinyl polydimethylsiloxane (weight average molecular weight of 22000 g / mol) is 9:1:6.67.

[0047] Table 1 Trimethylsilyloxy-terminated methylhydrogensiloxane-dimethylsiloxane copolymer CAS: [68037-59-2] TSCA

[0048] model Viscosity Molecular weight Methylhydrogensiloxane molar percentage Equivalent weight proportion Refractive index HMS-013 5000-8000 45,000-60,000 0.5-1.5 10,000 0.97 1.404

[0049] Table 2 Trimethylsilyloxy-terminated vinylmethylsiloxane-dimethylsiloxane copolymer CAS: [67762-94-1] TSCA

[0050] model Viscosity Molecular weight Vinyl methylsiloxane molar percentage Vinyl equivalent / kg proportion VDT-123 250-350 12,000 0.8-1.2 0.11-0.15 0.97

[0051] The method for preparing the above-mentioned water-resistant and low-ice-adhesion magnesium oxychloride cement comprises the following steps:

[0052] (1) dissolving magnesium chloride hexahydrate in water and mixing the mixture to obtain a first solution;

[0053] (2) mixing the organosilicon uniformly to obtain a second solution;

[0054] (3) stirring the first solution and the second solution at 300 rpm for 5 min to obtain a third solution;

[0055] (4) adding light-burned magnesium oxide to the third solution and mixing them uniformly to obtain magnesium oxychloride cement mortar;

[0056] (5) injecting the slurry obtained in step (4) into a mold and vibrating it, curing it at room temperature (20±2)°C and (60±5)% humidity for 24 hours, and then demolding it;

[0057] (6) The demoulded sample was placed at room temperature (20±2)°C and humidity (60±5)% and cured for 28 days to obtain magnesium oxychloride cement with water resistance and low ice adhesion.

[0058] Examples 2 to 5

[0059] A magnesium oxychloride cement with water resistance and low ice adhesion has a composition substantially the same as that of Example 1, except that the amounts of organic silicon used are 4 parts, 6 parts, 8 parts, and 10 parts, respectively.

[0060] The preparation method of the above-mentioned water-resistant and low-ice-adhesion magnesium oxychloride cement is the same as that of Example 1, and the prepared cements are named M4, M6, M8, and M10 in sequence.

[0061] Comparative Example 1

[0062] A magnesium oxychloride cement, whose composition is substantially the same as that of Example 1, except that no organosilicon is added.

[0063] The preparation method of the above-mentioned magnesium oxychloride cement comprises the following steps:

[0064] (1) dissolving magnesium chloride hexahydrate in water and mixing the mixture to obtain a first solution;

[0065] (2) adding light-burned magnesium oxide to the first solution and mixing them uniformly to obtain magnesium oxychloride cement mortar;

[0066] (3) injecting the slurry obtained in step (2) into a mold and vibrating it, curing it at room temperature (20±2)°C and (60±5)% humidity for 24 hours, and then demolding it;

[0067] (4) The demoulded sample is placed at room temperature (20±2)°C and humidity (60±5)% and cured for 28 days to obtain magnesium oxychloride cement.

[0068] (2) Results analysis

[0069] 2.1. Compressive strength analysis

[0070] like Figure 1 As shown, the compressive strength data of magnesium oxychloride cement after curing and the compressive strength after immersion in water for 7 days are shown. Among them, M0-M10 represents the number of silicone parts 0, 2, 4, 6, 8, and 10, and M0 is the comparative example. The compressive strength data of magnesium oxychloride cement after immersion in water for 7 days show that compared with the compressive strength of the unimmersed magnesium oxychloride cement, the compressive strength of the original magnesium oxychloride cement M0 without any modification operation decreases significantly, and only 18.32MPa remains after being eroded by water. This shows that the phase 5 that provides the mechanical strength of magnesium oxychloride cement is severely damaged. After the modified magnesium oxychloride cement is immersed in water, the decrease in compressive strength becomes smaller. Even if only 2wt.% of silicone material is added, the water resistance of magnesium oxychloride cement is significantly improved. When the addition amount reaches 6wt.% and above, the improvement of the water resistance of magnesium oxychloride cement by silicone material is more obvious, and the compressive strength can basically remain unchanged after 7 days of immersion in water.

[0071] 2.2. Water resistance analysis

[0072] like Figure 2 As shown, it is the softening coefficient of magnesium oxychloride cement of comparative example 1 and examples 1-5 which were naturally cured for 28 days and then immersed in water for 7 days.

[0073] The softening coefficient is calculated by the following formula: softening coefficient (7d) = compressive strength after 28 days of natural curing and then immersion in water for 7 days / compressive strength after 28 days of natural curing.

[0074] From the figure, we can clearly see that the softening coefficients of M6, M8, and M10 are basically above 95%, and even M2 is close to 50%. However, the softening coefficient of the comparative example M0 is below 25%, and its water resistance is very poor.

[0075] 2.3. Micromorphology analysis

[0076] like Figure 3 Figures 1 and 2 show SEM images of magnesium oxychloride cement after natural curing for 28 days and natural curing for 28 days followed by immersion in water for 7 days, respectively. a, b, c, d, e, and f are M0, M2, M4, M6, M8, and M10, respectively.

[0077] Observing Figure a, we can see that magnesium oxychloride cement without silicone has abundant needle-like structures. These needle-like structures are the 5·1·8 phase, or Phase 5, that provides high strength to magnesium oxychloride cement. Figure b shows magnesium oxychloride cement with 2 wt.% silicone. Compared with the original magnesium oxychloride cement, the needle-like crystals become thinner and shorter. This is because the silicone incorporation inhibits the growth of Phase 5 to a certain extent and forms a thin film on the needle-like structure, making it less obvious. When the silicone incorporation reaches 6 wt.%, that is, Figure d, the needle-like structures are almost completely encapsulated by the silicone film, with only a few needle-like structures visible in the figure. When the silicone incorporation reaches 10 wt.%, the needle-like structures are almost completely invisible in the figure, with only the tips of some needle-like structures exposed. This indicates that the silicone incorporation has completely encapsulated Phase 5. It is foreseeable that this silicone film will greatly reduce the surface water contact angle and surface energy of the magnesium oxychloride cement, thereby protecting the structure of the magnesium oxychloride cement from water damage.

[0078] 2.4. Ice adhesion strength analysis

[0079] like Figure 4 The following table shows the ice adhesion data for Example M10. When the silicone content reached 10 wt.%, the ice adhesion strength of the magnesium oxychloride cement surface was significantly improved. The average ice adhesion strength in the first test was 38.54 kPa. Subsequent ice adhesion tests revealed a slight increase in M10's ice adhesion strength, reaching approximately 55 kPa. Repeated ice adhesion tests revealed no significant change in M10's ice adhesion strength, indicating that the structure of M10 was intact and the amount of silicone added was sufficient to withstand multiple icing and deicing cycles. Figure 5 As shown, it is the ice adhesion strength of the overall modified magnesium oxychloride cement of the comparative example. The ice adhesion strength of the comparative example is extremely high, reaching 369.39 kPa, making deicing difficult.

[0080] To verify the long-term anti-icing and de-icing capabilities of the fully modified magnesium oxychloride cement, we subjected the fully modified magnesium oxychloride cement to freeze-thaw cycles, testing its ice adhesion strength after every five freeze-thaw cycles to verify its long-term anti-icing capabilities. During the freeze-thaw cycle, the freezing of water will generate significant stress, which will destroy the structure of the magnesium oxychloride cement. Especially after the magnesium oxychloride cement absorbs some water, the freezing of free water within the magnesium oxychloride cement will generate internal stress, which will damage the magnesium oxychloride cement from the inside. Figure 6The ice adhesion strength data for the overall modified magnesium oxychloride cement after freeze-thaw cycles are presented. This data was obtained from testing M10. During the freeze-thaw cycles of magnesium oxychloride cement, its ice adhesion strength showed a gradual increase. However, during the first 20 freeze-thaw cycles, the ice adhesion strength of magnesium oxychloride cement did not change significantly, remaining at around 60 kPa. This indicates that the structure of magnesium oxychloride cement did not undergo significant changes during these 20 freeze-thaw cycles. Even after 40 freeze-thaw cycles, the ice adhesion strength of the modified magnesium oxychloride cement was 213.41 kPa, two-thirds of the 300 kPa of unmodified magnesium oxychloride cement.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Those skilled in the art can modify or replace the technical solutions of the present invention according to the concept of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A water-resistant and low ice adhesion magnesium oxychloride cement, characterized in that: The method is mainly composed of the following raw materials in parts by weight: 80-120 parts of light-burned magnesium oxide, 40-60 parts of magnesium chloride, 30-40 parts of water, and 2-10 parts of organic silicon; The organosilicon is a polysiloxane with a reactive group on the side chain and / or a polysiloxane with a reactive group on the terminal group.

2. The water-resistant and low ice adhesion magnesium oxychloride cement according to claim 1, characterized in that: The polysiloxane with reactive groups on the side chain is a polysiloxane composition with R1 reactive groups and R2 reactive groups, wherein R1 and R2 appear in pairs and are selected from one of the following corresponding combinations: silicon hydrogen group and silicon vinyl group, methylamino group and carboxyl group, mercapto group and vinyl group, hydroxyl group and epoxy group, hydroxyl group and isocyanate group, amino group and isocyanate group, mercapto group and hydroxyl group, hydroxyl group and cyano group, and amino group and carboxyl group.

3. The water-resistant and low ice adhesion magnesium oxychloride cement according to claim 2, characterized in that: The polysiloxane with reactive groups in the side chain is a polysiloxane composition containing silicon hydrogen groups and silicon vinyl groups, which are respectively a trimethylsiloxy-terminated methyl hydrogen siloxane-dimethyl siloxane copolymer and a trimethylsiloxy-terminated vinyl methyl siloxane-dimethyl siloxane copolymer. The molar percentage of methyl hydrogen siloxane in the trimethylsiloxy-terminated methyl hydrogen siloxane-dimethyl siloxane copolymer is 0.5% to 1.5%, and the weight-average molecular weight ranges from 45,000 to 60,000 g / mol; the molar percentage of vinyl methyl siloxane in the trimethylsiloxy-terminated vinyl methyl siloxane-dimethyl siloxane copolymer is 0.8% to 1.2%, and the weight-average molecular weight is 12,000 g / mol.

4. The water-resistant and low ice adhesion magnesium oxychloride cement according to claim 1, characterized in that: The polysiloxane with reactive terminal groups is double-terminal vinyl polydimethylsiloxane with a weight average molecular weight of 22000 g / mol.

5. The water-resistant and low ice adhesion magnesium oxychloride cement according to claim 2, 3 or 4, characterized in that: The mass of the double-ended vinyl polydimethylsiloxane is 40% to 70% of the sum of the mass of the trimethylsiloxy-terminated methylhydrogensiloxane-dimethylsiloxane copolymer and the trimethylsiloxy-terminated vinylmethylsiloxane-dimethylsiloxane copolymer; the mass ratio of the trimethylsiloxy-terminated methylhydrogensiloxane-dimethylsiloxane copolymer to the trimethylsiloxy-terminated vinylmethylsiloxane-dimethylsiloxane copolymer is 7:3 to 9:

1.

6. The water-resistant and low ice adhesion magnesium oxychloride cement according to claim 5, characterized in that: The mass ratio of the trimethylsiloxy-terminated methylhydrogensiloxane-dimethylsiloxane copolymer, the trimethylsiloxy-terminated vinylmethylsiloxane-dimethylsiloxane copolymer, and the double-terminated vinyl polydimethylsiloxane is 9:1:6.

67.

7. The water-resistant and low ice adhesion magnesium oxychloride cement according to claim 1, characterized in that: The light-burned magnesia is prepared by calcining magnesite at 850° C., has an activity index of 60% to 70%, and a magnesia content of 80% to 95%.

8. The water-resistant and low ice adhesion magnesium oxychloride cement according to claim 1, characterized in that: The magnesium chloride is magnesium chloride hexahydrate, with a MgCl2·6H2O content of ≥98% and a pH value of 5.0-6.

5.

9. The water-resistant and low ice adhesion magnesium oxychloride cement according to claim 1, characterized in that: The magnesium oxychloride cement comprises low ice adhesion.

10. The method for preparing water-resistant and low ice adhesion magnesium oxychloride cement according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) dissolving magnesium chloride in water and mixing uniformly to obtain a first solution; (2) mixing the organosilicon uniformly to obtain a second solution; (3) uniformly mixing the first solution and the second solution to obtain a third solution; (4) adding light-burned magnesium oxide to the third solution and mixing them uniformly to obtain magnesium oxychloride cement mortar; (5) injecting the slurry obtained in step (4) into a mold, vibrating it, and demoulding it after curing for a period of time; (6) After demoulding, magnesium oxychloride cement with water resistance and low ice adhesion is obtained by curing for a period of time.

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