阅读说明：本技术 一种氯氧镁水泥及其制备方法 (Magnesium oxychloride cement and preparation method thereof ) 是由 陈炬龙 刘侠 陈淑兴 于 2020-05-15 设计创作，主要内容包括：本发明提供了一种氯氧镁水泥,包括以下组分：轻烧氧化镁、氯化镁溶液、促凝剂、缓凝剂、表面活性剂、含SiO2的工业废渣、固化剂、金属或金属氧化物,高铝水泥,其余为水；所述轻烧氧化镁中能参与水化反应的活性MgO的质量浓度为a,所述氯化镁溶液的质量浓度为C,所述轻烧氧化镁与所述氯化镁溶液的质量比＝(2.24-5.62C)/a；所述促凝剂的含量为0.2％～15％的活性MgO的质量；所述含SiO2的工业废渣的含量为10％～20％的活性MgO的质量；所述缓凝剂、所述表面活性剂、所述固化剂所述金属或金属氧化物、所述高铝水泥的含量均为0.3％～3.0％的活性MgO的质量。该氯氧镁水泥具有良好的防水性能及抗返卤性能。(The invention provides magnesium oxychloride cement, which comprises the following components: light-burned magnesium oxide, magnesium chloride solution, coagulant, retarder, surfactant, industrial waste residue containing SiO2, curing agent, metal or metal oxide, high-alumina cement and the balance of water; the mass concentration of active MgO capable of participating in hydration reaction in the light calcined magnesia is a, the mass concentration of the magnesium chloride solution is C, and the mass ratio of the light calcined magnesia to the magnesium chloride solution is (2.24-5.62C)/a; the content of the coagulant is 0.2 to 15 percent of the mass of active MgO; the content of the industrial waste residue containing SiO2 is 10-20% of the mass of active MgO; the contents of the retarder, the surfactant, the curing agent, the metal or metal oxide and the high-alumina cement are all 0.3-3.0% of the mass of active MgO. The magnesium oxychloride cement has good waterproof performance and anti-halogen-returning performance.)

1. The magnesium oxychloride cement is characterized by comprising the following components: light-burned magnesium oxide, magnesium chloride solution, coagulant, retarder, surfactant, industrial waste residue containing SiO2, curing agent, metal or metal oxide, high-alumina cement and the balance of water; the mass concentration of active MgO capable of participating in hydration reaction in the light calcined magnesia is a, the mass concentration of the magnesium chloride solution is C, and the mass ratio of the light calcined magnesia to the magnesium chloride solution is (2.24-5.62C)/a; the content of the coagulant is 0.2 to 15 percent of the mass of active MgO; the content of the industrial waste residue containing SiO2 is 10-20% of the mass of active MgO; the contents of the retarder, the surfactant, the curing agent, the metal or metal oxide and the high-alumina cement are all 0.3-3.0% of the mass of active MgO.

2. The magnesium oxychloride cement of claim 1, wherein the accelerator comprises an inorganic accelerator and an organic accelerator; the inorganic coagulant is selected from one or more of calcium chloride, sodium sulfate, aluminum sulfate, calcium nitrate, calcium nitrite, sodium nitrite, ammonium nitrate and calcium oxide; the organic coagulant is selected from one or more of triethanolamine and calcium formate.

3. The magnesium oxychloride cement of claim 2, wherein the accelerator is 0.4 to 3 wt% triethanolamine and 3 to 5 wt% calcium chloride.

4. The magnesium oxychloride cement of claim 1, wherein the set retarder comprises an organic set retarder and an inorganic set retarder; the organic retarder is selected from one or more of citric acid, oxalic acid, tartaric acid and gluconic acid; the inorganic retarder is one or more selected from trisodium phosphate, sodium pyrophosphate, zinc chloride, copper sulfate, zinc sulfate, sulfuric acid, phosphoric acid, sulfuric acid, silicic acid and tetraboric acid.

5. The magnesium oxychloride cement of claim 1, wherein the surfactant is one or more selected from the group consisting of lignosulphonates, naphthalates, ethyl silicate, polyoxyethylene octylphenol ether-10.

6. The magnesium oxychloride cement of claim 1, wherein the curing agent is selected from one or more of methyl methacrylate emulsion, styrene-acrylic emulsion, chlorine partial emulsion, neoprene emulsion, EVA emulsion, PF resin, UF resin, and MF resin.

7. The magnesium oxychloride cement of claim 1, wherein the industrial waste residue containing SiO2 is selected from one or more of fly ash, silica fume, slag, smelting slag and carbide slag.

8. The magnesium oxychloride cement of claim 1, wherein the metal or metal oxide is selected from one or more of copper powder, zinc oxide, boron oxide, and antimony trioxide.

9. The magnesium oxychloride cement of claim 1, further comprising mineral powder, sodium methyl silicate, rosin acid soap, and hydrogen peroxide.

10. The preparation method of the magnesium oxychloride cement as claimed in claims 1 to 9, characterized in that the magnesium oxychloride cement is obtained by calcining light-burned magnesium oxide at 700-800 ℃ for 1-hour and then mixing all the components.

Technical Field

The invention relates to magnesium oxychloride cement and a preparation method thereof, belonging to the technical field of magnesium cementing materials.

Background

Magnesium oxychloride water as magnesian cementing materialThe mud is prepared by using light calcined powder obtained by calcining magnesite or ash powder (main component is MgO) obtained by calcining dolomite at low temperature as cementing agent, and magnesium chloride hexahydrate (MgCl)₂·6H₂O) or the like as a blending agent, and water is added thereto to form a hardened cement.

The main component of hardened body formed by magnesium oxychloride cement is 5Mg (OH)₂·MgCl₂·8H₂O and 3Mg (OH)₂·MgCl₂·8H₂A magnesium oxide-magnesium chloride-water ternary compound crystal phase double salt consisting of O crystal phase, and a part of Mg (OH)₂A gelled body.

In the preparation process of the magnesium oxychloride cement, the magnesium oxide and the magnesium chloride solution are mixed and cured and then are hardened quickly without wet maintenance, the fracture resistance and the compressive strength are high, the hardness is high, the wear resistance is good, the artificial stone with larger brittleness and higher hardness is formed, and the hardened gelling property of the artificial stone can be utilized to process the artificial stone into various building materials and decorative materials, so that the magnesium oxychloride cement has wide application prospect.

However, magnesium oxychloride cement products generally have poor water resistance, and the surfaces of the products are wet in rainy and humid days, so that water drops are fully hung, even the water drops are connected into a piece, the products are easy to deform, and further the phenomena of bittern return and frost return are caused.

Disclosure of Invention

The present invention provides a solution to the above problems.

The invention is realized by the following steps:

the magnesium oxychloride cement comprises the following components: light-burned magnesium oxide, magnesium chloride solution, coagulant, retarder, surfactant, SiO-containing₂The industrial waste residue, the curing agent, the metal or the metal oxide and the balance of water; the mass concentration of active MgO capable of participating in hydration reaction in the light calcined magnesia is a, the mass concentration of the magnesium chloride solution is C, and the mass ratio of the light calcined magnesia to the magnesium chloride solution is (2.24-5.62C)/a; the content of the coagulant is 0.2 to 15 percent of the mass of active MgO; the SiO-containing layer₂The content of the industrial waste residue is 10 to 20 percent of the mass of the active MgO; the retarderThe contents of the surfactant, the curing agent, the high-alumina cement and the metal or metal oxide are all 0.3 to 3.0 percent of the mass of active MgO.

As a further improvement, the setting accelerator includes an inorganic setting accelerator and an organic setting accelerator; the inorganic coagulant is selected from one or more of calcium chloride, sodium sulfate, aluminum sulfate, calcium nitrate, calcium nitrite, sodium nitrite, ammonium nitrate and calcium oxide; the organic coagulant is selected from one or more of triethanolamine and calcium formate.

As a further improvement, the coagulant is 0.4-3 wt% of triethanolamine and 3-5 wt% of calcium chloride. At this concentration, the accelerating effect is best.

As a further improvement, the set retarder comprises an organic set retarder and an inorganic set retarder; the organic retarder is selected from one or more of citric acid, oxalic acid, tartaric acid and gluconic acid; the inorganic retarder is one or more selected from trisodium phosphate, sodium pyrophosphate, zinc chloride, copper sulfate, zinc sulfate, sulfuric acid, phosphoric acid, sulfuric acid, silicic acid and tetraboric acid.

As a further improvement, the surfactant is selected from one or more of lignosulfonate, naphthoate, ethyl silicate and polyoxyethylene octyl phenol ether-10.

As a further improvement, the curing agent is selected from one or more of methyl methacrylate emulsion, styrene-acrylic emulsion, chlorine partial emulsion, neoprene emulsion, EVA emulsion, PF resin, UF resin and MF resin.

As a further improvement, the SiO-containing₂The industrial waste residue is selected from one or more of fly ash, silica fume, slag, furnace slag, smelting slag and carbide mud.

As a further improvement, the metal or metal oxide is selected from one or more of copper powder, zinc oxide, boron oxide and antimony trioxide.

The further improvement comprises mineral powder, sodium methyl silicate, rosin acid soap and hydrogen peroxide.

The invention also provides a preparation method of the magnesium oxychloride cement, which comprises the steps of calcining the light-burned magnesium oxide at 700-800 ℃ for 1-hour, and uniformly mixing all the components to obtain the magnesium oxychloride cement.

The invention has the beneficial effects that:

the mass ratio of the light-burned magnesium oxide and the magnesium chloride solution of the magnesium oxychloride cement is (2.24-5.62C)/a, and under the mass ratio, the magnesium oxide, the magnesium chloride and the water are completely reacted to generate Mg (OH)₂And phase 518 (i.e. 5Mg (OH)₂·MgCl₂·8H₂O), additionally setting accelerators, retarders, surfactants, SiO-containing compounds₂The 518 phase has stable phase structure and cannot be converted into the 318 phase with poor mechanical properties (namely 3Mg (OH)) under the synergistic action of the industrial waste residue, the curing agent, the metal or metal oxide and other additives₂·MgCl₂·8H₂O) and Mg (OH)₂The product can prevent hydrolysis and performance deterioration.

The curing agent does not generate gelation precipitation and demulsification in the magnesium oxychloride material, has no destructive effect on hydration and hardening, can be polymerized by self-crosslinking, and can coat Mg (OH) in the process of participating in the hardening of the magnesium oxychloride₂Crystals, forming a good waterproof protective layer; meanwhile, crosslinking is carried out in the gap channels among the crystals to block the capillary channels, so that the waterproof performance and the anti-halogen return performance of the magnesium oxychloride material are improved.

During the preparation of magnesium oxychloride cement, MgO takes part in reaction in a granular state, and the growth core of partial MgO as product crystal is inevitably not completely reacted, thus causing excess Mg²⁺As a result, the stability, especially the expansion cracking, of the magnesium article is affected, and the frost return is also caused. The invention adds active SiO-containing₂Industrial waste residues such as fly ash, silica fume, granulated slag, etc., which are capable of forming a stable, sparingly soluble salt MgSiO₃Adding coagulant phosphoric acid can generate insoluble stable MgHPO₄·3H₂O salt, thereby overcoming Mg²⁺The negative effect of (1).

The invention uses the organic retarder and the inorganic retarder at the same time, wherein the inorganic acid not only has the retarding function, but also can reduce the number of open holes, increase the number of closed holes, improve the impermeability of the product, the organic retarder plays the retarding function, the organic retarder and the inorganic retarder play a synergistic effect, simultaneously, the use amount of the organic retarder and the inorganic retarder follows the difference of the active content, the ignition loss and the active calcium oxide content of the light-burned magnesium oxide in the raw materials, the selective blending use ensures the strength of the magnesium oxychloride cement. Otherwise, it may cause side effects of reducing the intensity.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a diagram of a qualified product provided in example 1 of the present invention.

FIG. 2 is a view of a cracked product.

Fig. 3 is a product diagram of frost return.

FIG. 4 is a diagram of the product of dehalogenation.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.