阅读说明：本技术 一种建筑废弃物改性硅微粉及其制备方法 (Construction waste modified silicon micropowder and preparation method thereof ) 是由 郭强 王帅 王健 于 2021-01-20 设计创作，主要内容包括：本发明公开了一种建筑废弃物改性硅微粉及其制备方法,属于建筑材料领域。改性硅微粉由如下重量份的原料组成：亚磷酸3-5份、预处理建筑废弃物100-120份、正硅酸乙酯200-250份、1H,1H,2H,2H-全氟癸基三乙氧基硅烷2-6份、壳聚糖10-15份、十二烷基苯磺酸钠4-7份、氧化聚乙烯蜡5-8份。本发明首先将建筑废弃物采用碱液浸泡,不仅可以清除表面酸性残留,而且可以改善土粉间的孔隙率,之后与正硅酸乙酯形成的硅溶胶共混,以壳聚糖、聚乙烯蜡为包覆原料,再经过煅烧,可以有效的形成稳定的包覆硅微粉,该成品具有很好的吸附性能,且力学强度高,可以适用于环保涂料、塑料材料等,适用性好。(The invention discloses construction waste modified silicon micropowder and a preparation method thereof, belonging to the field of building materials. The modified silicon micropowder consists of the following raw materials in parts by weight: 3-5 parts of phosphorous acid, 120 parts of pretreated building waste, 250 parts of tetraethoxysilane 200, 2-6 parts of 1H,1H,2H, 2H-perfluorodecyl triethoxysilane, 10-15 parts of chitosan, 4-7 parts of sodium dodecyl benzene sulfonate and 5-8 parts of oxidized polyethylene wax. According to the invention, the building waste is soaked in alkali liquor, so that surface acid residues can be removed, the porosity among soil powders can be improved, then the building waste is mixed with silica sol formed by ethyl orthosilicate, chitosan and polyethylene wax are used as coating raw materials, and then the mixture is calcined, so that stable coated silica micropowder can be effectively formed.)

1. The construction waste modified silicon micropowder is characterized by comprising the following raw materials in parts by weight:

3-5 parts of phosphorous acid, 120 parts of pretreated building waste, 250 parts of tetraethoxysilane 200, 2-6 parts of 1H,1H,2H, 2H-perfluorodecyl triethoxysilane, 10-15 parts of chitosan, 4-7 parts of sodium dodecyl benzene sulfonate and 5-8 parts of oxidized polyethylene wax.

2. The construction waste modified silica micropowder of claim 1, wherein the construction waste comprises muck, waste mortar and broken waste bamboo wood, and the volume ratio of the muck to the broken waste mortar to the broken waste bamboo wood is 1: 2: 1.

3. the construction waste modified silica micropowder according to claim 1, wherein the preparation method of the pretreated construction waste comprises the following steps:

adding alkali liquor into the construction waste, stirring uniformly, stacking for 2-3 hours, feeding into a sintering furnace, calcining for 60-80 minutes at the temperature of 700 plus materials and 800 ℃, discharging, cooling and grinding into fine powder.

4. The construction waste modified silica micropowder of claim 3, wherein the alkali solution is an aqueous solution of sodium hydroxide or potassium hydroxide with a concentration of 1.6-2 mol/L.

5. The preparation method of the construction waste modified silica micropowder as claimed in claim 1, characterized by comprising the following steps:

1) adding oxidized polyethylene wax into thionyl chloride 7-11 times of the weight of the oxidized polyethylene wax, uniformly stirring, feeding the mixture into a constant-temperature water bath at the temperature of 60-65 ℃, adding phosphorous acid, keeping the temperature and stirring for 1-2 hours, discharging and cooling, and removing a solvent by rotary evaporation to obtain modified polyethylene wax;

2) adding 1H,1H,2H, 2H-perfluorodecyl triethoxysilane into 20-30 times of anhydrous ethanol, and stirring to obtain silane dispersion;

3) adding chitosan into deionized water 40-50 times of the weight of chitosan, and stirring uniformly to obtain water dispersion;

4) adding tetraethoxysilane into the aqueous dispersion obtained in the step 3), uniformly stirring, mixing with the silane dispersion obtained in the step 2), adding the modified polyethylene wax obtained in the step 1) and the pretreated construction waste, stirring for 4-6 hours, carrying out suction filtration, washing a filter cake with water, mixing with sodium dodecyl benzene sulfonate, sintering, grinding, and sieving to obtain the construction waste modified silicon micropowder.

6. The method for preparing the construction waste modified silica micropowder as claimed in claim 5, wherein the sintering temperature in step 4) is 700-800 ℃ for 1-2 hours.

Technical Field

The invention belongs to the field of building materials, and particularly relates to building waste modified silicon micropowder and a preparation method thereof.

Background

The construction waste refers to the general name of dregs, waste concrete, waste bricks and other wastes generated in the production activities of the construction industry such as demolition, construction, decoration, repair and the like, and is classified according to the production source, and the construction waste can be divided into engineering dregs, decoration waste, demolition waste, engineering mud and the like; the construction waste can be classified into slag, concrete blocks, broken stone blocks, broken bricks and tiles, waste mortar, slurry, asphalt blocks, waste plastics, waste metals, waste bamboo and wood and the like according to the composition. These materials are not helpful to the construction itself, but are substances generated in the construction process, and need to be treated correspondingly, so that the ideal engineering project construction can be achieved, and because the materials are an integral process, the link consideration is more important.

With the acceleration of industrialization and urbanization, the construction industry is rapidly developing, and along with the increase of the generated construction waste, the quantity of Chinese construction waste accounts for more than 1/3 of the total quantity of municipal waste. As 2011, the stock of solid domestic garbage in China reaches 70 hundred million tons, the total quantity of construction garbage can be calculated to be 21 hundred million to 28 hundred million tons, and more than 3 hundred million tons of construction garbage are newly generated every year. If a simple stacking mode is adopted for treatment, the newly added construction waste occupies 1.5 to 2 hundred million square meters of land each year. China is in the period of high-speed development of economic construction, and hundreds of millions of tons of construction wastes are inevitably generated every year. If the treatment and the utilization are not carried out in time, adverse effects are inevitably brought to the society, the environment and resources.

The site selection of most urban building garbage stacking places is random to a great extent, and a great number of potential safety hazards are left. Near the construction site become the temporary place of stacking of building rubbish more, because only drawing construction convenience and lack due safeguard measure, under the influence of external factor, building rubbish piles up and collapses building rubbish at will- -the military use collapses, hinders the road and even takes place when towards the phenomenon of other buildings. In suburbs, pits, ponds and ditches are the first-choice stacking places for building garbage, so that the storage capacity of water bodies is reduced, and the ground drainage and flood discharge capacity is reduced.

With the continuous development of cities, a large amount of construction waste is randomly stacked, which not only occupies land, but also pollutes environment and directly or indirectly affects air quality.

At present, most of the construction wastes in China are treated in a landfill mode, however, in the stacking process of the construction wastes, under the action of temperature, moisture and the like, some organic substances are decomposed to generate harmful gases, for example, the waste gypsum of the construction wastes contains a large amount of sulfate ions, the sulfate ions can be converted into hydrogen sulfide with smelly eggs flavor under the anaerobic condition, lignin and tannic acid can be dissolved out of waste paper boards and waste wood materials under the anaerobic condition and are decomposed to generate volatile organic acid, and the harmful gases can pollute the atmosphere when being discharged into the air; bacteria and dust in the garbage drift with wind to cause air pollution; a small amount of combustible building waste can generate toxic carcinogenic substances in the burning process, so that secondary pollution to air is caused.

The regeneration and utilization of the construction waste in China have a certain technical foundation, and both the research of laboratories and the market application have certain achievements. After being sorted, removed or crushed, most of wastes in the construction wastes can be reused as renewable resources, such as metals of waste steel bars, waste iron wires, waste electric wires, various waste steel fittings and the like, can be used for replacing sand, can be used for building mortar, plastering mortar, making concrete cushions and the like, and can also be used for manufacturing building material products such as building blocks, paving bricks, lattice bricks and the like.

At present, most of construction wastes are used for building materials, the application range is small, and the applicability is not high.

Disclosure of Invention

The invention aims to provide a construction waste modified silicon micropowder and a preparation method thereof, which aim to improve the utilization rate of construction waste and solve the problems that the existing construction waste is mostly used as a building material, and has small application range and low applicability.

The technical scheme adopted by the invention for solving the technical problems is as follows:

1. the invention provides a construction waste modified silicon micropowder which is prepared from the following raw materials in parts by weight:

3-5 parts of phosphorous acid, 120 parts of pretreated building waste, 250 parts of tetraethoxysilane 200, 2-6 parts of 1H,1H,2H, 2H-perfluorodecyl triethoxysilane, 10-15 parts of chitosan, 4-7 parts of sodium dodecyl benzene sulfonate and 5-8 parts of oxidized polyethylene wax.

Further, the construction waste comprises slag, waste mortar and broken waste bamboo wood, and the volume ratio of the slag, the waste mortar and the broken waste bamboo wood is 1: 2: 1.

further, the preparation method of the pretreated construction waste comprises the following steps:

adding alkali liquor into the construction waste, stirring uniformly, stacking for 2-3 hours, feeding into a sintering furnace, calcining for 60-80 minutes at the temperature of 700 plus materials and 800 ℃, discharging, cooling and grinding into fine powder.

Further, the alkali liquor is sodium hydroxide aqueous solution or potassium hydroxide aqueous solution with the concentration of 1.6-2 mol/L.

2. The invention also provides a preparation method of the construction waste modified silicon micropowder, which comprises the following steps:

1) adding oxidized polyethylene wax into thionyl chloride 7-11 times of the weight of the oxidized polyethylene wax, uniformly stirring, feeding the mixture into a constant-temperature water bath at the temperature of 60-65 ℃, adding phosphorous acid, keeping the temperature and stirring for 1-2 hours, discharging and cooling, and removing a solvent by rotary evaporation to obtain modified polyethylene wax;

2) adding 1H,1H,2H, 2H-perfluorodecyl triethoxysilane into 20-30 times of anhydrous ethanol, and stirring to obtain silane dispersion;

3) adding chitosan into deionized water 40-50 times of the weight of chitosan, and stirring uniformly to obtain water dispersion;

4) adding tetraethoxysilane into the aqueous dispersion obtained in the step 3), uniformly stirring, mixing with the silane dispersion obtained in the step 2), adding the modified polyethylene wax obtained in the step 1) and the pretreated construction waste, stirring for 4-6 hours, carrying out suction filtration, washing a filter cake with water, mixing with sodium dodecyl benzene sulfonate, sintering, grinding, and sieving to obtain the construction waste modified silicon micropowder.

Further, the sintering temperature in the step 4) is 700-800 ℃, and the time is 1-2 hours.

Compared with the prior art, the construction waste modified silicon micropowder and the preparation method thereof have the following beneficial effects:

according to the invention, the building waste is soaked in alkali liquor, so that surface acid residues can be removed, the porosity among soil powders can be improved, then the building waste is mixed with silica sol formed by ethyl orthosilicate, chitosan and polyethylene wax are used as coating raw materials, and then the mixture is calcined, so that stable coated silica micropowder can be effectively formed.

Detailed Description

Example 1

The invention relates to a construction waste modified silicon micropowder which is prepared from the following raw materials in parts by weight:

3 parts of phosphorous acid, 100 parts of pretreated construction waste, 200 parts of tetraethoxysilane, 2 parts of 1H,1H,2H, 2H-perfluorodecyl triethoxysilane, 10 parts of chitosan, 4 parts of sodium dodecyl benzene sulfonate and 5 parts of oxidized polyethylene wax.

Wherein the construction waste comprises slag, waste mortar and broken waste bamboo wood, and the volume ratio of the slag, the waste mortar and the broken waste bamboo wood is 1: 2: 1.

the preparation method of the pretreated construction waste comprises the following steps:

adding alkali liquor into the construction waste, stirring uniformly, stacking for 2 hours, feeding into a sintering furnace, calcining for 60 minutes at 700 ℃, discharging, cooling, and grinding into fine powder.

The alkali liquor is sodium hydroxide aqueous solution with the concentration of 1.6 mol/L.

A preparation method of construction waste modified silica micropowder comprises the following steps:

(1) adding 5 parts of oxidized polyethylene wax into thionyl chloride with the weight 7 times that of the oxidized polyethylene wax, uniformly stirring, feeding the mixture into a constant-temperature water bath at the temperature of 60 ℃, adding 3 parts of phosphorous acid, keeping the temperature and stirring for 1 hour, discharging and cooling, and removing a solvent by rotary evaporation to obtain modified polyethylene wax;

(2) adding 2 parts of 1H,1H,2H, 2H-perfluorodecyl triethoxysilane into 20 times of anhydrous ethanol, and uniformly stirring to obtain a silane dispersion liquid;

(3) adding 10 parts of chitosan into deionized water with the weight 40 times of that of the chitosan, and uniformly stirring to obtain water dispersion;

(4) adding 200 parts of tetraethoxysilane into the aqueous dispersion, uniformly stirring, mixing with the silane dispersion, adding the modified polyethylene wax and 100 parts of pretreated construction waste, stirring for 4 hours, performing suction filtration, washing a filter cake, mixing with 4 parts of sodium dodecyl benzene sulfonate, sintering, grinding and sieving to obtain the construction waste modified silicon micropowder.

The sintering temperature in the step (4) is 700 ℃, and the time is 1 hour.

Example 2

The invention relates to a construction waste modified silicon micropowder which is prepared from the following raw materials in parts by weight:

5 parts of phosphorous acid, 120 parts of pretreated construction waste, 250 parts of tetraethoxysilane, 6 parts of 1H,1H,2H, 2H-perfluorodecyl triethoxysilane, 15 parts of chitosan, 7 parts of sodium dodecyl benzene sulfonate and 8 parts of oxidized polyethylene wax.

Wherein the construction waste comprises slag, waste mortar and broken waste bamboo wood, and the volume ratio of the slag, the waste mortar and the broken waste bamboo wood is 1: 2: 1.

the preparation method of the pretreated construction waste comprises the following steps:

adding alkali liquor into the construction waste, stirring uniformly, stacking for 3 hours, feeding into a sintering furnace, calcining for 80 minutes at 800 ℃, discharging, cooling, and grinding into fine powder.

The alkali liquor is a potassium hydroxide aqueous solution with the concentration of 2 mol/L.

A preparation method of construction waste modified silica micropowder comprises the following steps:

(1) adding 8 parts of oxidized polyethylene wax into 11 times of thionyl chloride, uniformly stirring, feeding into a constant-temperature water bath at 65 ℃, adding 5 parts of phosphorous acid, keeping the temperature and stirring for 2 hours, discharging, cooling, and removing the solvent by rotary evaporation to obtain modified polyethylene wax;

(2) adding 6 parts of 1H,1H,2H, 2H-perfluorodecyl triethoxysilane into 30 times of anhydrous ethanol, and uniformly stirring to obtain a silane dispersion liquid;

(3) adding 15 parts of chitosan into deionized water with the weight 50 times of that of the chitosan, and uniformly stirring to obtain a water dispersion;

(4) adding 250 parts of tetraethoxysilane into the aqueous dispersion, uniformly stirring, mixing with the silane dispersion, adding the modified polyethylene wax and 120 parts of pretreated construction waste, stirring for 6 hours, performing suction filtration, washing a filter cake, mixing with 7 parts of sodium dodecyl benzene sulfonate, sintering, grinding and sieving to obtain the construction waste modified silicon micropowder.

The sintering temperature in the step (4) is 800 ℃, and the time is 2 hours.

Example 3

The invention relates to a construction waste modified silicon micropowder which is prepared from the following raw materials in parts by weight:

4 parts of phosphorous acid, 110 parts of pretreated construction waste, 220 parts of tetraethoxysilane, 4 parts of 1H,1H,2H, 2H-perfluorodecyl triethoxysilane, 12 parts of chitosan, 6 parts of sodium dodecyl benzene sulfonate and 6 parts of oxidized polyethylene wax.

Wherein the construction waste comprises slag, waste mortar and broken waste bamboo wood, and the volume ratio of the slag, the waste mortar and the broken waste bamboo wood is 1: 2: 1.

the preparation method of the pretreated construction waste comprises the following steps:

adding alkali liquor into the construction waste, stirring uniformly, stacking for 2 hours, feeding into a sintering furnace, calcining for 65 minutes at 760 ℃, discharging, cooling, and grinding into fine powder.

The alkali liquor is sodium hydroxide aqueous solution with the concentration of 1.8 mol/L.

A preparation method of construction waste modified silica micropowder comprises the following steps:

(1) adding 6 parts of oxidized polyethylene wax into thionyl chloride which is 10 times of the weight of the oxidized polyethylene wax, uniformly stirring, feeding the mixture into a constant-temperature water bath at the temperature of 62 ℃, adding 4 parts of phosphorous acid, keeping the temperature and stirring for 1 hour, discharging and cooling, and removing a solvent by rotary evaporation to obtain modified polyethylene wax;

(2) adding 4 parts of 1H,1H,2H, 2H-perfluorodecyl triethoxysilane into 23 times of anhydrous ethanol, and uniformly stirring to obtain a silane dispersion liquid;

(3) adding 12 parts of chitosan into deionized water 43 times of the chitosan, and uniformly stirring to obtain a water dispersion;

(4) adding 220 parts of tetraethoxysilane into the aqueous dispersion, uniformly stirring, mixing with the silane dispersion, adding the modified polyethylene wax and 110 parts of pretreated construction waste, stirring for 5 hours, performing suction filtration, washing a filter cake, mixing with 6 parts of sodium dodecyl benzene sulfonate, sintering, grinding into powder, and sieving to obtain the construction waste modified silicon micropowder.

And (4) sintering at 750 deg.c for 1.7 hr.

Examples testing:

	example 1	Example 2	Example 3
				Hardness (Mohs hardness)	7	8	7
Average particle diameter (μm)	12.57	30.5	48.4

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

In addition to the technical features described in the specification, the technology is known to those skilled in the art.