Waterproof high-sticking jointing mortar and its preparation method

Abstract

The application relates to the field of building materials and particularly discloses waterproof high-bonding mortar and a preparation method thereof. The waterproof high-bonding mortar is prepared from the following raw materials in parts by weight: cement 350-450 parts, quartz sand 450-550 parts, active filler 60-80 parts, bonding agent 8-16 parts, early strength agent 4-8 parts, fibrous material 3-6 parts and water-repellent agent 1-3 parts; the active filler is composed of modified metakaolin and redispersible glue powder; the preparation method comprises the following steps: S1, uniformly mixing cement, quartz sand, fibrous material and active filler; and S2, uniformly mixing the bonding agent, the early strength agent and the water-repellent agent; the preparation process is simple, the prepared mortar has good waterproofness and bonding strength, is suitable for use in a humid environment, is not prone to water seepage and falling-off, and has good stability in adhesion to a brick material and a stone veneer.

Description

Technical Field

[0001] This application relates to the field of building materials, and more specifically, to a waterproof, highly adhesive mortar and its preparation method. Background Technology

[0002] Yijiao mortar is a single-component, dry powder material that integrates waterproofing, bonding, and leak-stopping functions. It is a non-toxic and odorless new type of rigid waterproof adhesive material, typically used as an bonding layer between the concrete structural layer of walls or floors and the brick or stone veneer layer.

[0003] Currently, commonly used adhesive mortar is made from cement, sand, and compounded cellulose and starch ether. Cellulose and starch ether absorb water, which increases the consistency and viscosity of the adhesive mortar. This type of adhesive mortar can be used as a bonding material for everyday walls or floors.

[0004] However, in some poorly ventilated and damp environments, such as the walls and floors of toilets, mortar is prone to absorbing water, which can lead to water seepage and unstable adhesion, causing the brick or stone veneer to fall off and reducing the stability of mortar in use. Summary of the Invention

[0005] To address the issue that adhesive mortar is prone to water absorption and unstable adhesion when used in humid and poorly ventilated environments, thus reducing its stability, this application provides a waterproof and highly adhesive adhesive mortar and its preparation method.

[0006] In the first aspect, this application provides a waterproof and highly adhesive adhesive mortar, which adopts the following technical solution:

[0007] A waterproof and highly adhesive adhesive mortar is made from the following raw materials in parts by weight:

[0008]

[0009] The active filler is composed of modified metakaolin and redispersible polymer powder.

[0010] By adopting the above technical solution, cement and quartz sand are used as the main materials of the cement mortar. Active fillers and binders are dispersed in the cement and quartz sand, playing a role in dispersion and bonding. Among them, the active fillers are composed of modified metakaolin and redispersible polymer powder. Modified metakaolin has good dispersibility and bonding properties, and it has good dispersibility in cement and quartz sand. The cement mortar prepared in this way can quickly absorb water during the curing process, and it plays a good synergistic role with the redispersible polymer powder and binder. It can stably disperse and bond the cement and quartz sand to form a dense bond structure. The dense bond structure makes the cured cement mortar have good strength, waterproofness and aging resistance, and it is not easy for water to seep in. Fiber materials can improve the toughness of the cement mortar, making it less prone to cracking after curing. Early strength agents can improve the early curing strength of the cement mortar, and water-repellent agents can further improve the waterproof performance of the cement mortar.

[0011] The adhesive mortar prepared in this application has good bonding strength, water resistance and aging resistance, and good bonding stability to bricks and stones. When applied in airtight and humid environments, it is not prone to water seepage and peeling problems.

[0012] Preferably, the modified metakaolin is prepared from the following raw materials in parts by weight:

[0013] 50-80 parts of metakaolin

[0014] 100-150 parts of 40-60 wt% ethanol aqueous solution

[0015] 2-4 parts of silane coupling agent

[0016] 3-8 parts of polyvinyl alcohol

[0017] 3-6 parts of rosin polyester polyol

[0018] 2-4 parts of pentaerythritol triallyl ether.

[0019] By adopting the above technical solution, a 40-60wt% ethanol aqueous solution uniformly disperses metakaolin, while a silane coupling agent modifies the metakaolin, enabling it to mix uniformly with the redispersible polymer powder and then uniformly disperse in cement and quartz sand. Polyvinyl alcohol, rosin polyester polyol, and pentaerythritol triallyl ether produce a good synergistic effect, enhancing the dispersion and synergistic effect of metakaolin with the redispersible polymer powder and binder, thus forming a relatively stable and dense adhesive structure. After absorbing water, it can uniformly disperse and adsorb cement and quartz sand. After curing, a waterproof and high-strength waterproof structure is formed, with good waterproofness and aging resistance, and it is not easy for water to seep in.

[0020] Preferably, the modified metakaolin is prepared by the following steps:

[0021] A1. Add metakaolin to a 40-60wt% ethanol aqueous solution, then add silane coupling agent, heat to 50-65℃, stir for 30-60min, then filter and dry to obtain pretreated metakaolin.

[0022] A2. Add polyvinyl alcohol, rosin polyester polyol and pentaerythritol triallyl ether to pretreated metakaolin, knead and stir for 1-2 hours to obtain modified metakaolin.

[0023] By adopting the above technical solution, firstly, silane coupling agent is used to modify metakaolin to obtain pretreated metakaolin, which improves the dispersibility of the pretreated metakaolin. Then, the pretreated metakaolin is mixed with polyvinyl alcohol, rosin polyester polyol and pentaerythritol triallyl ether. The modified metakaolin obtained in this way can be uniformly dispersed with fillers such as cement and quartz sand, and can also be dispersed with redispersible adhesive powder and binder, thereby improving the waterproof and aging resistance of the prepared mortar.

[0024] Preferably, the weight ratio of the modified metakaolin to the redispersible polymer powder is 1:(0.5-0.8).

[0025] By adopting the above technical solution, modified metakaolin redispersible powder with a better ratio has better dispersibility and adhesion, which can improve the bonding strength and waterproofness of the mortar. When the amount of redispersible powder increases, the mortar has good bonding strength, but it lacks the adsorption and waterproofing properties of modified metakaolin, and the waterproofness and aging resistance of the mortar will decrease.

[0026] Preferably, the binder is cellulose and / or starch ether.

[0027] By adopting the above technical solution, using cellulose and / or starch ether as binders, moisture can be absorbed to form a bonding system, increasing the consistency and viscosity of the mortar. The resulting mortar has good bonding strength and water retention.

[0028] Preferably, the fiber material is composed of wood fibers and polypropylene fibers in a weight ratio of (0.2-0.8):(1-2).

[0029] By adopting the above technical solution, wood fiber has good water absorption, strength and toughness, while polypropylene fiber has good strength and elasticity. Using wood fiber and polypropylene fiber in a better ratio as fiber materials can improve the strength and density of the adhesive mortar, and further improve the bonding strength of the adhesive mortar.

[0030] Preferably, the early strength agent is any one or a combination of calcium chloride, sodium chloride, calcium formate, sodium sulfate, calcium sulfate, and triethanolamine.

[0031] By adopting the above technical solution, the above early strength agent can effectively accelerate the hydration rate of the prepared cement and improve the early strength of the cement.

[0032] Preferably, the hydrophobic agent is potassium methylsilicate and / or sodium methylsilicate.

[0033] By adopting the above technical solutions, the water-repellent agent can further improve the waterproofness of the cement mortar.

[0034] Secondly, this application provides a method for preparing waterproof and highly adhesive mortar, employing the following technical solution:

[0035] A method for preparing a waterproof and highly adhesive adhesive mortar includes the following preparation steps:

[0036] S1. Add cement, quartz sand, fiber materials and active fillers to a mixing device and mix evenly to obtain mixture I;

[0037] S2. Add binder, accelerator and water repellent to mixture I, mix evenly to obtain the adhesive mortar.

[0038] By adopting the above technical solution, the active filler is first mixed with cement, quartz sand and fiber materials to make the active filler evenly dispersed. Then the remaining components are added and stirred evenly. The resulting adhesive mortar has good compactness and dispersion uniformity.

[0039] Preferably, the mixing rate in step S1 is 1000-2000 r / min, and the mixing time is 1-5 h.

[0040] By adopting the above technical solution, the better mixing conditions can make cement, quartz sand and active filler mix evenly, reduce the water absorption of cement and improve the compactness of the prepared cement mortar.

[0041] In summary, this application has the following beneficial effects:

[0042] 1. The waterproof and highly adhesive mortar of this application uses modified metakaolin and redispersible latex powder as active fillers, and is compounded with cement, quartz sand, binder, early strength agent, fiber material and water repellent agent. The resulting mortar has good bonding strength, as well as good waterproof and aging resistance.

[0043] 2. By using silane coupling agent, polyvinyl alcohol, rosin polyester polyol and pentaerythritol triallyl ether in synergy, metakaolin is modified. The modified metakaolin can further enhance the effect of redispersible polymer powder and binder, improve the bonding strength of the prepared mortar, and improve the waterproofness and aging resistance of the mortar.

[0044] 3. The preparation method of this application produces a mortar with good compactness and uniform dispersion. Detailed Implementation

[0045] The present application will be further described in detail below with reference to the embodiments.

[0046] The following are some of the sources and specifications of the raw materials used in this application. The raw materials used in the preparation examples and embodiments of this application can all be obtained commercially, including but not limited to the following models and manufacturers of raw materials. Raw materials with equivalent performance can also be used:

[0047] 1. Cement: PO 42.5 ordinary Portland cement;

[0048] 2. Quartz sand: 40-120 mesh;

[0049] 3. Metakaolin: 50-60% silica, 20-25% calcium, 4000 mesh;

[0050] 4. Polyvinyl alcohol: Model PVA2488;

[0051] 5. Rosin polyester polyol: Lauter A220E;

[0052] 6. Pentaerythritol triallyl ether: CAS No. 1471-17-6, content 75%;

[0053] 7. Wood fiber: fiber diameter 32-80um, fiber length 0.5-3mm;

[0054] 8. Polypropylene fiber: fiber diameter 18-48um, fiber length 6-12mm.

[0055] Preparation example of modified metakaolin

[0056] Preparation Example 1

[0057] Preparation Example 1 discloses a modified metakaolin, which is prepared by the following steps:

[0058] A1. Add 5 kg of metakaolin to 10 kg of 40 wt% ethanol aqueous solution, then add 0.2 kg of A171 as a silane coupling agent, heat to 50 °C, stir for 30 min, then filter and dry to obtain pretreated metakaolin.

[0059] A2. Add 0.3 kg of polyvinyl alcohol, 0.6 kg of rosin polyester polyol and 0.2 kg of pentaerythritol triallyl ether to the pretreated metakaolin, knead and stir for 1 hour to obtain modified metakaolin.

[0060] Preparation Examples 2-3

[0061] The difference between Preparation Example 2-3 and Preparation Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.

[0062] Table 1. Raw material amounts and preparation conditions for preparation examples 1-3

[0063]

[0064] Preparation of Comparative Example 1

[0065] The difference between Comparative Example 1 and Preparation Example 1 is that the rosin polyester polyol was replaced with polycaprolactone diol with a molecular weight of 3000, while the rest was the same as Preparation Example 1.

[0066] Preparation of Comparative Example 2

[0067] The difference between Comparative Example 2 and Preparation Example 1 is that pentaerythritol triallyl ether was replaced with an equal amount of polyvinyl alcohol, while the rest was the same as Preparation Example 1.

[0068] Preparation of Comparative Example 3

[0069] The difference between Comparative Example 3 and Preparation Example 1 is that rosin polyester polyol and pentaerythritol triallyl ether are replaced with polyvinyl alcohol in equal amounts, while the rest is the same as Preparation Example 1.

[0070] Example

[0071] Example 1

[0072] Example 1 discloses a waterproof and highly adhesive adhesive mortar, which is prepared by the following steps:

[0073] S1. 35 kg of cement, 45 kg of quartz sand, fiber material composed of 0.05 kg of wood fiber and 0.25 kg of polypropylene fiber, and active filler composed of 3 kg of modified metakaolin prepared in Example 1 and 3 kg of redispersible adhesive powder Wacker 5010N are added to a mixer and mixed for 1 h at a mixing rate of 1000 r / min to obtain mixture I.

[0074] S2. Add a binder consisting of 0.6 kg hydroxypropyl ethyl cellulose and 0.2 kg hydroxypropyl starch ether, 0.4 kg calcium formate as an early strength agent, and 0.1 kg sodium methyl silicate as a water repellent to mixture I, mix evenly, and obtain the adhesive mortar.

[0075] Example 2-3

[0076] The difference between Examples 2-3 and Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 2 below.

[0077] Table 2. Raw material usage and preparation conditions for Examples 1-3

[0078]

[0079]

[0080] Examples 4-6

[0081] The difference between Examples 4-6 and Example 1 is that the source of the modified metakaolin is different, as detailed in Table 3 below.

[0082] Table 3. Source of modified metakaolin in Examples 4-6

[0083] Example Sources of modified metakaolin Example 4 Preparation of Comparative Example 1 Example 5 Preparation of Comparative Example 2 Example 6 Preparation of Comparative Example 3

[0084] Example 7

[0085] The difference between Example 7 and Example 1 is that the ratio of modified metakaolin to redispersible polymer powder is different. The amount of modified metakaolin is 4 kg and the amount of redispersible polymer powder is 2 kg. Everything else is the same as in Example 1.

[0086] Example 8

[0087] The difference between Example 8 and Example 7 is that the amount of modified metakaolin is 3.33 kg and the amount of redispersible polymer powder is 2.67 kg, while the rest is the same as in Example 7.

[0088] Comparative Example

[0089] Comparative Example 1

[0090] The difference between Comparative Example 1 and Example 1 is that the modified metakaolin was replaced with an equal amount of commercially available metakaolin, while the rest is the same as Example 1.

[0091] Comparative Example 2

[0092] The difference between Comparative Example 2 and Example 1 is that the modified metakaolin was replaced with an equal amount of binder, while the rest is the same as Example 1.

[0093] Comparative Example 3

[0094] The difference between Comparative Example 3 and Example 1 is that the modified metakaolin was replaced with an equal amount of redispersible latex powder, while the rest was the same as Example 1.

[0095] Performance testing

[0096] The following tests were conducted on the performance of the waterproof and highly adhesive mortars prepared in Examples 1-8 and Comparative Examples 1-3:

[0097] According to the test methods in T / SZWA001-2017 "Polymer Adhesive Cement", the following properties of the adhesive cement were tested respectively:

[0098] Tensile bond strength (unit: MPa, 28d), ≥1 is considered acceptable;

[0099] Tensile bond strength after immersion in water (unit: MPa, 28d), ≥1 is considered acceptable;

[0100] Tensile bond strength after aging (unit: MPa, 28d), ≥1 is considered acceptable;

[0101] Test and record the test data, see Table 4 for details.

[0102] Table 4 Performance test data of Examples 1-8 and Comparative Examples 1-3

[0103]

[0104] Based on Examples 1-3 and 4-6, Comparative Example 1, and Table 4, it can be seen that using the modified metakaolin of this application can further improve the waterproofness and adhesion of the prepared mortar. The tensile bond strength after immersion and aging tests is relatively high. In Examples 4-6, the rosin polyester polyol, pentaerythritol triallyl ether, and polyvinyl alcohol of this application were not used for compounding, and the modified metakaolin was modified. The waterproofness and aging performance of the prepared mortar were reduced, possibly because the dispersion effect of metakaolin in the mortar system was reduced, resulting in a decrease in the structural density of the mortar system, which in turn makes it more prone to water absorption and poor aging resistance. In Comparative Example 1, commercially available metakaolin was used, and the waterproofness and aging resistance of the prepared mortar were reduced.

[0105] Based on Examples 7-8 and Comparative Examples 2-3, and in conjunction with Table 4, it can be seen that using a more optimal ratio of modified metakaolin, redispersible polymer powder, and binder to formulate a compound produces a mortar with good tensile bond strength, as well as good waterproofing and aging resistance. In Comparative Example 2, the modified metakaolin was replaced with a binder, and in Comparative Example 3, the modified metakaolin was replaced with redispersible polymer powder. Although the resulting mortar had good tensile bond strength, its tensile bond strength and aging resistance decreased significantly after immersion in water. This may be because the mortar lacked the waterproofing effect of modified metakaolin, making it prone to water seepage.

[0106] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A waterproof and highly adhesive adhesive mortar, characterized in that, It consists of the following raw materials in parts by weight: 350-450 parts cement 450-550 parts of quartz sand 60-80 parts of active filler 8-16 parts adhesive 4-8 parts of early-strength agent 3-6 parts of fiber material 1-3 parts of water-repellent agent; The binder is cellulose and / or starch ether; The active filler is composed of modified metakaolin and redispersible polymer powder, and the weight ratio of the modified metakaolin to the redispersible polymer powder is 1:(0.5-0.8). The modified metakaolin is composed of the following raw materials in parts by weight: 50-80 parts of metakaolin 100-150 parts of 40-60wt% ethanol aqueous solution 2-4 parts of silane coupling agent 3-8 parts of polyvinyl alcohol 3-6 parts of rosin polyester polyol 2-4 parts of pentaerythritol triallyl ether; The modified metakaolin is prepared by the following steps: A1. Add metakaolin to a 40-60wt% ethanol aqueous solution, then add a silane coupling agent, heat to 50-65℃, stir for 30-60min, then filter and dry to obtain pretreated metakaolin. A2. Add polyvinyl alcohol, rosin polyester polyol and pentaerythritol triallyl ether to pretreated metakaolin, knead and stir for 1-2 hours to obtain modified metakaolin.

2. The waterproof and highly adhesive adhesive mortar according to claim 1, characterized in that: The fiber material is composed of wood fibers and polypropylene fibers in a weight ratio of (0.2-0.8):(1-2).

3. The waterproof and highly adhesive adhesive mortar according to claim 1, characterized in that: The early strength agent is any one or a combination of calcium chloride, sodium chloride, calcium formate, sodium sulfate, calcium sulfate, and triethanolamine.

4. The waterproof and highly adhesive adhesive mortar according to claim 1, characterized in that: The hydrophobic agent is potassium methylsilicate and / or sodium methylsilicate.

5. A method for preparing a waterproof and highly adhesive adhesive mortar as described in any one of claims 1-4, characterized in that: The preparation steps include the following: S1. Add cement, quartz sand, fiber materials and active fillers to a mixing device and mix evenly to obtain mixture I; S2. Add binder, accelerator and water repellent to mixture I, mix evenly to obtain the adhesive mortar.

6. The method for preparing a waterproof and highly adhesive adhesive mortar according to claim 5, characterized in that: In step S1, the mixing rate is 1000-2000 r / min and the mixing time is 1-5 h.

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