Polymer cement waterproof mortar with fireproof function and preparation method thereof

Abstract

The invention discloses a polymer cement waterproof mortar with a fireproof function and a preparation method thereof, and belongs to the technical field of cement mortars.The polymer cement waterproof mortar with the fireproof function is prepared from cement, quartz sand, quartz powder, waterproof rubber powder, cellulose, wood fiber, a water repellent agent, a water reducing agent and a defoaming agent. The hydrophobic agent, the water reducing agent and the defoaming agent are adopted to prepare the powder, the hydrophobic agent can improve the waterproof effect, the water reducing agent can improve the compactness of mortar, improve the compressive strength and breaking strength of the mortar, improve the impermeability of the mortar, reduce the water absorption rate of the mortar and improve the compression-bending ratio, and the defoaming agent has a good foam inhibition effect and is beneficial to improving the compactness of the mortar; and cellulose is adopted, so that the water-retaining property of the cement mortar can be improved, the hydration time can be prolonged, and the mixing viscosity of the mortar can be increased.

Description

Technical Field

[0001] This invention relates to the field of cement mortar technology, specifically to a fire-resistant polymer cement waterproof mortar and its preparation method. Background Technology

[0002] Polymer cement waterproof mortar is made primarily of cement and fine aggregate. It boasts advantages such as high bonding strength, convenient construction, corrosion resistance, high temperature resistance, and aging resistance. It is mainly used for repairing or preventing seepage in building roofs and interior / exterior walls, as well as for waterproofing and seepage prevention in various water tanks and swimming pools. With the rapid development of my country's construction industry, the usage of polymer cement waterproof mortar has also increased significantly.

[0003] However, the fire resistance, impermeability, water absorption rate, and flexural strength of related products currently on the market still cannot meet the higher requirements of building construction technology, thus limiting the development of building construction. Therefore, we propose a fire-resistant polymer cement waterproof mortar and its preparation method to solve the problems mentioned above. Summary of the Invention

[0004] The purpose of this invention is to provide a fire-resistant polymer cement waterproof mortar and its preparation method, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides a fire-resistant polymer cement waterproof mortar, comprising the following components: cement, quartz sand, quartz powder, waterproof adhesive powder, cellulose, wood fiber, hydrophobic agent, water-reducing agent, and defoamer.

[0006] Preferably, the weight parts of each component are 400 parts cement, 350 parts quartz sand, 160 parts quartz powder, 35 parts waterproof adhesive powder, 1.8 parts cellulose, 3 parts wood fiber, 2 parts hydrophobic agent, 1.5 parts water-reducing agent, and 1.3 parts defoamer.

[0007] A method for preparing a fire-resistant polymer cement waterproof mortar includes the following steps:

[0008] S1 adds hydrophobic agent, water-reducing agent, defoamer, and waterproof adhesive powder to the reactor and stirs them to obtain powder;

[0009] S2 After crushing the quartz sand with a roller, it is sieved. An appropriate amount of quartz sand is then added to a mixing tank along with cement and quartz powder for mixing.

[0010] S2 is added to the powder, cellulose and wood fiber of S1 during the mixing process, and then thoroughly mixed to obtain a polymer cement waterproof mortar with fireproof function.

[0011] Preferably, in step S1, the reactor rotation speed is controlled at 300–500 r / min, and the stirring time is 20–30 min.

[0012] Preferably, the average particle size of the quartz sand is 80-120 mesh.

[0013] Preferably, the cellulose is a cellulose ether.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) The present invention is prepared by mixing quartz sand, quartz powder and cement. Quartz sand has properties such as high temperature resistance, small coefficient of thermal expansion, high insulation and corrosion resistance. Quartz powder has excellent thermal shock resistance and extremely low coefficient of thermal shrinkage, good anti-deposition and good corrosion resistance. The two are mixed together to achieve excellent fire resistance, thereby greatly improving the fire resistance performance of the present invention.

[0016] (2) The present invention uses hydrophobic agent, water-reducing agent and defoamer to prepare powder. Hydrophobic agent can improve waterproof effect, water-reducing agent can improve mortar density, increase mortar compressive strength and flexural strength, improve mortar impermeability, reduce mortar water absorption rate and increase compressive-flexural ratio, defoamer has good foam suppression effect, which is conducive to improving mortar density, increasing mortar strength and decreasing water absorption rate. The use of cellulose can improve the water retention of cement mortar, prolong hydration time and increase mortar mixing viscosity. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] A fire-resistant polymer cement waterproof mortar comprises the following components: cement, quartz sand, quartz powder, waterproof adhesive powder, cellulose, wood fiber, hydrophobic agent, water-reducing agent, and defoamer. The weight parts of each component are as follows: cement 400 parts, quartz sand 350 parts, quartz powder 160 parts, waterproof adhesive powder 35 parts, cellulose 1.8 parts, wood fiber 3 parts, hydrophobic agent 2 parts, water-reducing agent 1.5 parts, and defoamer 1.3 parts.

[0019] A method for preparing a fire-resistant polymer cement waterproof mortar includes the following steps:

[0020] S1 adds hydrophobic agent, water-reducing agent, defoamer, and waterproof adhesive powder into the reactor and stirs them. The reactor speed is controlled at 300-500 r / min, and the stirring is carried out for 20-30 minutes to obtain powder.

[0021] S2 After crushing the quartz sand with a roller, it is sieved. The average particle size of the quartz sand is 80-120 mesh. Take an appropriate amount of quartz sand and put it into a mixing tank with cement and quartz powder for mixing.

[0022] S2 is mixed with powder, cellulose and wood fiber from S1 during the mixing process. The cellulose is cellulose ether. After thorough mixing, a polymer cement waterproof mortar with fire-retardant function is obtained.

[0023] Water-reducing agents can improve the density of mortar, increase its compressive strength and flexural strength, improve its impermeability, reduce its water absorption rate, and increase its compressive-flexural ratio. As shown in Table 1, with the increase of water-reducing agent dosage, the compressive and flexural strengths of the mortar both increase significantly. Compared with products without water-reducing agent, when the water-reducing agent dosage is 0.15% and 0.25%, the 28-day compressive strength increases by 13% and 38% respectively, the 28-day flexural strength increases by 9% and 9% respectively, and the water absorption rate decreases by 38% and 80% respectively. Considering that adding too much water-reducing agent will increase the mortar's compressive-flexural ratio and reduce its flexibility, the dosage of water-reducing agent should not be too high. 0.15% (i.e., the weight percentage of this invention) is selected as the optimal dosage.

[0024] Table 1. Effects of water-reducing agent dosage on the strength, flexural ratio, and water absorption of polymer cement waterproof mortar.

[0025]

[0026]

[0027] Cellulose can improve the water retention of cement mortar, prolong the hydration time, and increase the viscosity of the mortar mix. The optimal cellulose dosage is 0.18%. Excessive cellulose will affect the workability of the mortar, while insufficient cellulose will result in insufficient bond strength. The addition of cellulose will reduce the mechanical strength of the mortar. This is because cellulose has an air-entraining effect, increasing the porosity of the mortar and affecting its density. The air-entraining effect also causes an increase in the water absorption rate of the mortar (as shown in Table 2). The water absorption rate of mortar with a cellulose content of 0.32% is 30% and 38% higher than that of 0.26% and 0.18%, respectively. Increasing the cellulose content also significantly increases the 28-day bond strength of the product. Since the addition of cellulose reduces the mechanical strength of the mortar and increases its water absorption rate, cellulose should be used as little as possible while still meeting the required bond strength. 0.18% (i.e., the weight percentage of this invention) is the optimal dosage.

[0028] Table 2. Effects of cellulose content on the strength, flexural ratio, and water absorption of polymer cement waterproof mortar.

[0029]

[0030] A large number of air bubbles are generated during mortar mixing. Since water-reducing agents, cellulose, and waterproofing powder all have air-entraining effects, a certain amount of defoamer should be added to polymer cement waterproof mortar. Defoamers have a good foam-suppressing effect, which helps improve mortar density, increase mortar strength, and reduce water absorption. Quartz sand has a melting point of 1750℃ and possesses properties such as high temperature resistance, low coefficient of thermal expansion, high insulation, and corrosion resistance. Quartz powder has excellent thermal shock resistance and an extremely low coefficient of thermal shrinkage, good anti-deposition properties, and good corrosion resistance.

[0031] Table 3 Physical properties of the present invention

[0032] 28-day compressive strength 28d flexural strength 28-day bond strength Drying crack resistance Fire resistance rating 28.3 10.25 1.01 No cracks A1

[0033] The physical properties of the fire-resistant polymer cement waterproof mortar of the present invention, as shown in Table 3, were tested. The 28-day compressive strength reached 28.3 MPa, the 28-day flexural strength reached 10.25 MPa, the 28-day bond strength reached 1.01 MPa, there was no cracking, it met the GB / T5464 standard, the furnace temperature rise ΔT ≤ 30℃, the mass loss rate Δm ≤ 50%, the continuous burning time t=0, and the fire resistance rating reached A1.

[0034] Any content not described in detail in this specification is prior art known to those skilled in the art.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A polymer cement waterproof mortar with fire-retardant function, characterized in that, It includes the following components: cement, quartz sand, quartz powder, waterproof adhesive powder, cellulose, wood fiber, hydrophobic agent, water-reducing agent and defoamer.

2. The fire-resistant polymer cement waterproof mortar according to claim 1, characterized in that: The weight percentages of each component are as follows: 400 parts cement, 350 parts quartz sand, 160 parts quartz powder, 35 parts waterproof adhesive powder, 1.8 parts cellulose, 3 parts wood fiber, 2 parts hydrophobic agent, 1.5 parts water-reducing agent, and 1.3 parts defoamer.

3. The method for preparing fire-resistant polymer cement waterproof mortar as described in any one of claims 1-2, characterized in that, Includes the following steps: S1 adds hydrophobic agent, water-reducing agent, defoamer, and waterproof adhesive powder into the reactor and stirs them to obtain powder; S2 After crushing the quartz sand with a roller, it is sieved. An appropriate amount of quartz sand is then added to a mixing tank along with cement and quartz powder for mixing. S2 is mixed with powder, cellulose and wood fiber from S1 during the mixing process, and then thoroughly mixed to obtain a fire-resistant polymer cement waterproof mortar.

4. The method for preparing a fire-resistant polymer cement waterproof mortar according to claim 3, characterized in that: In S1, the reactor rotation speed is controlled at 300-500 r / min, and the stirring time is 20-30 min.

5. The method for preparing a fire-resistant polymer cement waterproof mortar according to claim 3, characterized in that: The average particle size of the quartz sand is 80-120 mesh.

6. The method for preparing a fire-resistant polymer cement waterproof mortar according to claim 3, characterized in that: The cellulose used is cellulose ether.

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