Dust-free cement-based adhesive and preparation method thereof

Abstract

The invention discloses a dust-free cement-based adhesive and a preparation method thereof, and relates to the technical field of building materials, the dust-free cement-based adhesive comprises Portland cement, modified dust suppression quartz sand, redispersible latex powder, cellulose ether and calcium formate, the modified dust suppression quartz sand is prepared by performing high-boiling fraction on a reaction product generated by hydrogenation and aromatic hydrocarbon removal of raw oil under high-temperature partial pressure and then mixing with quartz sand. The method disclosed by the invention is simple to operate and low in preparation cost, and the prepared cement-based adhesive is excellent in dust suppression effect, good in adhesive property and good in mechanical property.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and particularly relates to a dust-free cement-based adhesive and a preparation method thereof. Background Art

[0002] Cement-based adhesives are prepared mainly from cement, adding fillers and other additives. Due to their excellent bonding performance, durability and construction convenience, they are widely used in fields such as building decoration, structural repair and engineering reinforcement.

[0003] At present, the raw materials for preparing cement-based adhesives contain extremely fine powder materials, and a large amount of dust is often emitted under mechanical vibration or other external forces, which not only pollutes the environment but also seriously damages the health of workers. At present, the prevention and control of dust mainly rely on using dust removal equipment and wearing labor protection supplies in the workplace. However, using dust removal equipment and wearing protection supplies cannot reduce the dust generated during the pouring and stirring of the adhesive. Moreover, due to the insufficient self-protection awareness of the staff, the situation of dust hazards is more severe. Therefore, it is of great significance to solve the problem at the root and provide a dust-free cement-based adhesive. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: aiming at the deficiencies existing in the prior art, to provide a dust-free cement-based adhesive and a preparation method thereof, the method is simple to operate, the preparation cost is low, and the prepared cement-based adhesive not only has excellent dust suppression effect, but also has good bonding performance and mechanical properties.

[0005] To solve the above technical problems, the technical solution of the present invention is:

[0006] A dust-free cement-based adhesive, comprising portland cement, modified dust-suppressing quartz sand, redispersible latex powder, cellulose ether, calcium formate, wherein the modified dust-suppressing quartz sand is obtained by mixing quartz sand with the reaction product of raw oil after high-temperature hydrogenation and de-aromatization under high pressure to remove high-boiling fractions.

[0007] Preferably, the amounts of each component in the dust-free cement-based adhesive, in parts by weight, are respectively: 350 - 450 parts of portland cement, 450 - 650 parts of modified dust-suppressing quartz sand, 15 - 30 parts of redispersible latex powder, 3 - 5 parts of cellulose ether, and 5 - 10 parts of calcium formate.

[0008] Preferably, the particle size range of the modified dust-suppressing quartz sand is 40 - 80 mesh and 80 - 120 mesh; the mass ratio of the 40 - 80 mesh modified dust-suppressing quartz sand to the 80 - 120 mesh modified dust-suppressing quartz sand is (1.5 - 2):1.

[0009] Preferably, the portland cement is one of ordinary portland cements with a grade of 42.5 or above.

[0010] Preferably, the cellulose ether is hydroxypropyl methyl cellulose ether.

[0011] Preferably, the redispersible latex powder is Wacker 5010N latex powder.

[0012] In order to better solve the above technical problems, the present invention also provides the following technical solutions:

[0013] A preparation method of a dust-free cement-based adhesive, comprising the following steps:

[0014] (1) Hydrogen is added to the raw material oil to form a gas-liquid mixed phase state, then a catalyst is added, the temperature is raised for reaction, after the reaction is completed, the reaction product is subjected to gas-liquid separation, the liquid phase is collected, and the liquid phase is subjected to distillation treatment to collect the target fraction;

[0015] (2) The obtained target fraction is cooled to room temperature, and then a certain amount of the target fraction is added to quartz sand and stirred at high speed to obtain modified dust-suppressing quartz sand;

[0016] (3) The above-mentioned modified dust-suppressing quartz sand is mixed and stirred evenly with portland cement, redispersible latex powder, cellulose ether, and calcium formate to obtain a dust-free cement-based adhesive.

[0017] As a preference of the above technical solution, in step (1), the raw material oil is selected from industrial white oil or crude oil.

[0018] As a preference of the above technical solution, in step (1), the catalyst is a noble metal catalyst supported on amorphous silica-alumina, and the noble metal is selected from one or more of platinum, rhodium, palladium, and ruthenium; wherein the content of the noble metal in the catalyst is 0.1 wt%-3.0 wt%, the specific surface area of the catalyst is 150-500 m 2 / g, and the pore volume is 0.3-0.6 ml / g.

[0019] Preferably, the temperature of the reaction is 250-280 °C, the hydrogen partial pressure is 10-20 MPa, and the reaction time is 0.5-3 h.

[0020] Preferably, the distillation treatment is carried out under normal pressure, and the high-boiling fraction with a boiling point range of 280-350 °C is collected.

[0021] Preferably, the mass ratio of the target fraction to the quartz sand is (1-2):200.

[0022] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] 1. The dust-free cement-based adhesive provided by the present invention includes portland cement, modified dust-suppressing quartz sand, redispersible latex powder, hydroxypropyl methyl cellulose ether, and calcium formate. The modified dust-suppressing quartz sand is prepared by mixing quartz sand with the reaction product obtained by hydrogenation and aromatics removal of the raw material oil under high-temperature partial pressure and then performing high-boiling fractionation. There are a large number of active functional groups on the surface of the modified dust-suppressing quartz sand. After being mixed and homogenized with cement and other fine powders, a firm chemical bond is generated on the surface layer of the dust particles, and then the fine dust particles are firmly agglomerated into clusters through the bond energy between the particles, preventing dust from being generated during the pouring and stirring of the cement-based adhesive, making the cement-based adhesive more environmentally friendly.

[0024] 2. The surface of the modified dust-suppressing quartz sand prepared by the present invention contains saturated hydrocarbon components, and saturated hydrocarbons are insoluble in water. After being fully mixed with cement and other powders, a hydrocarbon protective film is attached to the surface of the adhesive, preventing water molecules in the air from invading. Therefore, the dry mix of the dust-free cement-based adhesive has good moisture-proof performance during daily storage. Moreover, after adding water and stirring, the hydrocarbon protective film in the formed mortar can prevent capillary water loss and shrinkage on the surface layer of the cement mortar, thus greatly reducing the drying shrinkage of the mortar.

[0025] 3. By optimizing the dosage of each component, the dust-free cement-based adhesive prepared by the present invention can not only significantly reduce the dust generation during the use of the cement-based adhesive, but also improve the workability during the operation of the adhesive. The cellulose ether enhances the water retention and uniformity of the adhesive, and the addition of calcium formate improves the early strength of the adhesive and has good freeze-thaw resistance. Detailed Embodiments

[0026] In order to more clearly understand the above-mentioned objects, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0027] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all the embodiments.

[0028] To further understand the present invention, the preferred implementation schemes of the present invention will be described below in conjunction with embodiments. However, it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than a limitation on the claims of the present invention.

[0029] The carrier of the catalyst in the following examples and comparative examples is amorphous silica-alumina, which is a composite of alumina and silica, specifically amorphous silica-alumina Siral 40 produced by Sasol; the catalytic active component is Pt, the content in the catalyst is 0.2 wt%, the specific surface area of the catalyst is 330 mm 2 / g, and the pore volume is 0.41 ml / g.

[0030] In the following examples and comparative examples:

[0031] Industrial white oil: kinematic viscosity (40 °C, mm 2 / s): 4.7, flash point (open cup, °C): 130, pour point (°C): -39, color (Saybolt number): +25, appearance: colorless, odorless transparent liquid;

[0032] Hydroxypropyl methyl cellulose ether: HPMC10W, white or yellowish-white powder, which can increase the wet viscosity and water retention of mortar when incorporated into dry-mixed mortar.

[0033] Unless otherwise specified, the raw materials described in the following examples and comparative examples are all commercially available, and unless otherwise specified, the conditions are all conventional conditions in the art.

[0034] Example 1

[0035] A preparation method of a dust-free cement-based adhesive, comprising the following steps:

[0036] (1) Hydrogen is added to industrial white oil to form a gas-liquid mixed phase state, and then a catalyst is added. The temperature is raised to 260 °C, the hydrogen partial pressure is 15 MPa, and the reaction time is 1 h. After the reaction is completed, the reaction product is subjected to gas-liquid separation, the liquid phase is collected, and the liquid phase is subjected to atmospheric distillation treatment to collect the target fraction with a boiling range of 280-350 °C;

[0037] (2) The target fraction obtained above is cooled to room temperature, and then a certain amount of the target fraction is added to quartz sand (quartz sand with a particle size of 40-80 mesh and quartz sand with a particle size of 80-120 mesh are mixed at a mass ratio of 1.5:1), and the mass ratio of the target fraction to quartz sand is 1:200. High-speed stirring is carried out to obtain modified dust-suppressing quartz sand;

[0038] (3) By weight, 600 parts of the above-mentioned modified dust-suppressing quartz sand, 400 parts of portland cement (42.5 grade ordinary portland cement), 25 parts of redispersible latex powder (Wacker 5010N latex powder), 3 parts of hydroxypropyl methyl cellulose ether, and 7 parts of calcium formate are mixed and stirred evenly to obtain a dust-free cement-based adhesive.

[0039] Example 2

[0040] A preparation method of a dust-free cement-based adhesive, comprising the following steps:

[0041] (1) Hydrogen is added to industrial white oil to form a gas-liquid mixed phase state, and then a catalyst is added. The temperature is raised to 265 °C, the hydrogen partial pressure is 17 MPa, and the reaction time is 1 h. After the reaction ends, the reaction product is subjected to gas-liquid separation, and the liquid phase is collected. The collected liquid phase is subjected to distillation treatment, and the target fraction with a boiling range of 280 - 350 °C is collected;

[0042] (2) The target fraction obtained above is cooled to room temperature, and then a certain amount of the target fraction is added to quartz sand (quartz sand with a particle size of 40 - 80 mesh and quartz sand with a particle size of 80 - 120 mesh are mixed at a mass ratio of 1.6:1) and stirred at high speed. The mass ratio of the target fraction to the quartz sand is 1.5:200 to obtain modified dust-suppressing quartz sand;

[0043] (3) By weight, 650 parts of the above-mentioned modified dust-suppressing quartz sand, 350 parts of portland cement (42.5 grade ordinary portland cement), 25 parts of redispersible latex powder (Wacker 5010N latex powder), 3 parts of hydroxypropyl methyl cellulose ether, and 7 parts of calcium formate are mixed and stirred evenly to obtain a dust-free cement-based adhesive.

[0044] Example 3

[0045] A preparation method of a dust-free cement-based adhesive, comprising the following steps:

[0046] (1) Hydrogen is added to industrial white oil to form a gas-liquid mixed phase state, and then a catalyst is added. The temperature is raised to 270 °C, the hydrogen partial pressure is 17 MPa, and the reaction time is 1 h. After the reaction ends, the reaction product is subjected to gas-liquid separation, and the liquid phase is collected. The collected liquid phase is subjected to distillation treatment, and the target fraction with a boiling range of 280 - 350 °C is collected;

[0047] (2) The target fraction obtained above is cooled to room temperature, and then a certain amount of the target fraction is added to quartz sand (quartz sand with a particle size of 40 - 80 mesh and quartz sand with a particle size of 80 - 120 mesh are mixed at a mass ratio of 1.7:1) and stirred at high speed. The mass ratio of the target fraction to the quartz sand is 1.5:200 to obtain modified dust-suppressing quartz sand;

[0048] (3) By weight, 615 parts of the above-mentioned modified dust-suppressing quartz sand, 350 parts of portland cement (42.5 grade ordinary portland cement), 25 parts of redispersible latex powder (Wacker 5010N latex powder), 3 parts of hydroxypropyl methyl cellulose ether, and 7 parts of calcium formate are mixed and stirred evenly to obtain a dust-free cement-based adhesive.

[0049] Example 4

[0050] A preparation method of a dust-free cement-based adhesive, comprising the following steps:

[0051] (1) Hydrogen is added to industrial white oil to form a gas-liquid mixed phase state, and then a catalyst is added. The temperature is raised to 280 °C, the hydrogen partial pressure is 10 MPa, the reaction time is 1 h. After the reaction ends, the reaction product is subjected to gas-liquid separation, the liquid phase is collected, and the liquid phase is subjected to distillation treatment to collect the target fraction with a boiling point range of 280-350 °C;

[0052] (2) The target fraction obtained above is cooled to room temperature, and then a certain amount of the target fraction is added to quartz sand (quartz sand with a particle size of 40-80 mesh and quartz sand with a particle size of 80-120 mesh are mixed in a mass ratio of 2:1) for high-speed stirring. The mass ratio of the target fraction to quartz sand is 1:200 to obtain modified dust-suppressing quartz sand;

[0053] (3) By weight, 650 parts of the above-mentioned modified dust-suppressing quartz sand, 350 parts of Portland cement (42.5 grade ordinary Portland cement), 30 parts of redispersible latex powder (Wacker 5010N latex powder), 3 parts of hydroxypropyl methyl cellulose ether, and 7 parts of calcium formate are mixed and stirred evenly to obtain a dust-free cement-based adhesive.

[0054] In order to verify that the cement-based adhesive of the present invention has better effects, the following takes Example 1 as a reference and combines multiple comparative examples for detailed description.

[0055] Comparative Example 1

[0056] The difference between this comparative example and Example 1 is that the quartz sand is not modified, and other operations are the same as those in Example 1.

[0057] Comparative Example 2

[0058] The difference between this comparative example and Example 1 is that ordinary quartz sand is used instead of modified dust-suppressing quartz sand. During preparation, 650 parts of ordinary quartz sand, 350 parts of Portland cement, 25 parts of redispersible latex powder, 3 parts of hydroxypropyl methyl cellulose ether, and 7 parts of calcium formate are mixed in a metering ratio to obtain a cement-based adhesive, and other operations are the same as those in Example 1.

[0059] Comparative Example 3

[0060] The difference between this comparative example and Example 1 is that ordinary quartz sand is used instead of modified dust-suppressing quartz sand. During preparation, 615 parts of ordinary quartz sand, 350 parts of Portland cement, 25 parts of redispersible latex powder, 3 parts of hydroxypropyl methyl cellulose ether, and 7 parts of calcium formate are mixed in a metering ratio to obtain a cement-based adhesive, and other operations are the same as those in Example 1.

[0061] Comparative Example 4

[0062] This comparative example is different from Example 1 in that: ordinary quartz sand is used instead of modified dust-suppressing quartz sand. During preparation, 650 parts of ordinary quartz sand, 350 parts of portland cement, 30 parts of redispersible latex powder, 3 parts of hydroxypropyl methyl cellulose ether, and 7 parts of calcium formate are mixed according to the metering ratio to obtain a cement-based adhesive. Other operations are the same as those in Example 1.

[0063] Comparative Example 5

[0064] This comparative example is different from Example 1 in that: an equal amount of 40-80 mesh quartz sand is used to replace 80-120 mesh quartz sand. Other operations are the same as those in Example 1.

[0065] Comparative Example 6

[0066] This comparative example is different from Example 1 in that: an equal amount of 80-120 mesh quartz sand is used to replace 40-80 mesh quartz sand. Other operations are the same as those in Example 1.

[0067] The adhesives prepared in the above examples and comparative examples were subjected to performance tests below. The test methods and results are as follows.

[0068] 1. Mechanical property test:

[0069] The tensile bond strength of the mortar was tested according to JC / T547 2017 "Ceramic Tile Adhesive".

[0070] The shrinkage rate of the mortar was tested according to JC / T603 2004 "Test Method for Drying Shrinkage of Cement Mortar".

[0071] Adhesives of the same mass were placed in a 90% curing box, and their moisture-proof performance was tested by observing their caking phenomenon.

[0072] 2. Dust test:

[0073] The cement-based adhesives prepared in the comparative examples and examples were poured at the same height. A dust detector was used to continuously sample in the same space, at the same measurement point, the same height, the same direction, and the same path. The average value of no less than 10 readings was taken as the dust mass concentration when the adhesive was poured.

[0074] The test results are shown in Table 1.

[0075] Table 1

[0076]

[0077] It can be seen from the above test results that, compared with the comparative examples, in the present invention, 40-80 mesh and 80-120 mesh quartz sands are mixed in a certain proportion to optimize the particle size distribution, reduce the porosity, enhance the mechanical interlocking effect, and thus improve the mechanical properties of the material.

[0078] The present invention uses oil film to wrap sand grains to obtain modified dust-suppressing quartz sand, which can reduce the dust generated by the friction of sand grains; moreover, the oily substance can also adhere to fine particles to prevent the occurrence of dust-raising phenomena; and the target fraction forms a hydrophobic barrier on the surface of the quartz sand, hindering the penetration of moisture and improving the moisture-proof performance of the material.

[0079] The present invention not only uses modified dust-suppressing quartz sand, but also optimizes the dosage ratio of each component to obtain a cement-based mortar with good mechanical properties, excellent moisture-proof performance and good dust-suppressing effect.

[0080] In this article, specific examples are used to elaborate on the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention, including the best mode, and also enables any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The protection scope of the present invention patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to the literal description of the claims, or if they include equivalent structural elements that have no substantial difference from the literal description of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A dust-free cement-based adhesive, characterized in that: The invention comprises silicate cement, modified dust suppression quartz sand, redispersible latex powder, cellulose ether and calcium formate. The modified dust suppression quartz sand is prepared by mixing the high boiling fraction of the reaction product generated by hydrogenating the raw oil under high temperature and partial pressure and removing aromatics with the quartz sand.

2. A dust-free cement-based adhesive according to claim 1, characterized in that: The amounts of the components in the dust-free cement-based adhesive, in parts by weight, are: 350-450 parts of silicate cement, 450-650 parts of modified dust-suppressing quartz sand, 15-30 parts of redispersible latex powder, 3-5 parts of cellulose ether, and 5-10 parts of calcium formate.

3. A dust-free cement-based adhesive according to claim 1, characterized in that: The particle size range of the modified dust suppression quartz sand is 40-80 mesh and 80-120 mesh; the mass ratio of the modified dust suppression quartz sand of 40-80 mesh to the modified dust suppression quartz sand of 80-120 mesh is (1.5-2):

1.

4. A dust-free cement-based adhesive according to claim 1, characterized in that: The silicate cement is one of ordinary silicate cements of grade 42.5 or above; the cellulose ether is hydroxypropyl methyl cellulose ether; and the redispersible latex powder is Wacker 5010N latex powder.

5. The method for preparing a dust-free cement-based adhesive according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) adding hydrogen to the feedstock oil to form a gas-liquid mixed phase state, then adding a catalyst, heating the reaction, separating the gas and liquid of the reaction product after the reaction is completed, collecting the liquid phase, distilling the liquid phase, and collecting the target fraction; (2) cooling the target fraction obtained above to room temperature, and then adding a certain amount of the target fraction to quartz sand for high-speed stirring to obtain modified dust-suppressing quartz sand; (3) The modified dust-suppressing quartz sand is mixed with silicate cement, redispersible latex powder, cellulose ether and calcium formate to obtain a dust-free cement-based adhesive.

6. The method for preparing a dust-free cement-based adhesive according to claim 5, characterized in that: In step (1), the raw oil is selected from industrial white oil or crude oil.

7. The method for preparing a dust-free cement-based adhesive according to claim 5, characterized in that: In step (1), the catalyst is a noble metal catalyst with amorphous silicon aluminum as a carrier, and the noble metal is selected from one or more of platinum, rhodium, palladium and ruthenium; wherein the content of the noble metal in the catalyst is 0.1wt%-3.0wt%, and the specific surface area of ​​the catalyst is 150-500mm 2 / g, and the pore volume is 0.15-0.60ml / g.

8. The method for preparing a dust-free cement-based adhesive according to claim 5, characterized in that: In step (1), the reaction temperature is 250-280°C, the hydrogen partial pressure is 10-20 MPa, and the reaction time is 0.5-3 h.

9. The method for preparing a dust-free cement-based adhesive according to claim 5, characterized in that: In step (1), the distillation treatment is carried out under normal pressure, and a high boiling point fraction with a boiling point range of 280-350° C. is collected.

10. The method for preparing a dust-free cement-based adhesive according to claim 5, characterized in that: In step (2), the mass ratio of the target fraction to the quartz sand is (1-2):200.

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