阅读说明：本技术 一种瓷砖胶的柔性增强材料及其制备方法和应用 (Flexible reinforcing material of ceramic tile glue and preparation method and application thereof ) 是由 范敦城 熊卫锋 吴应林 刘晓斌 庞家琪 韩朝辉 王宏斌 张宁 于 2019-11-22 设计创作，主要内容包括：本发明公开了一种瓷砖胶的柔性增强材料及其制备方法和应用。以所述柔性增强材料的总重量计,该柔性增强材料包括：偏高岭土40-80wt％,超细矿粉5-20wt％,粉煤灰5-15wt％,纳米二氧化硅3-15wt％和木质纤维4-20wt％。本发明的柔性增强材料,在显著增强瓷砖胶的柔性的同时,还能够使瓷砖胶的粘结强度得到一定程度的提高。(The invention discloses a flexible reinforcing material of a ceramic tile adhesive, and a preparation method and application thereof. The flexible reinforcing material comprises, based on the total weight of the flexible reinforcing material: 40-80 wt% of metakaolin, 5-20 wt% of superfine mineral powder, 5-15 wt% of fly ash, 3-15 wt% of nano silicon dioxide and 4-20 wt% of wood fiber. The flexible reinforcing material provided by the invention can obviously enhance the flexibility of the tile glue and can improve the bonding strength of the tile glue to a certain extent.)

1. A flexible reinforcement for tile mastic, comprising, based on the total weight of the flexible reinforcement: 40-80 wt% of metakaolin, 5-20 wt% of superfine mineral powder, 5-15 wt% of fly ash, 3-15 wt% of nano silicon dioxide and 4-20 wt% of wood fiber.

2. The flexible reinforcing material according to claim 1, wherein the metakaolin has a fineness D90 of 15 μm or more and a mesh number of 1000 or more.

3. The flexible reinforced material of claim 1, wherein the fineness of the ultrafine ore powder is D90 ≥ 15 μm, the mesh number ≥ 1000 mesh, and the 1-day activity index ≥ 100%.

4. The flexible reinforced material of claim 1, wherein the strength activity index of the fly ash is not less than 70%, the loss on ignition is not more than 8.0 wt%, the content of free calcium oxide is not more than 4.0 wt%, and the balance of a 45 μm square-hole sieve is not more than 25%.

5. The flexible reinforced material of claim 1, wherein the nanosilica has an average particle size of 5-100 nm.

6. A flexible reinforcing material according to claim 1, wherein the wood fibres have a length of 0.5-10 mm.

7. A method for preparing a flexible reinforcing material according to any one of claims 1 to 6, characterized in that it comprises: and uniformly mixing metakaolin, superfine mineral powder, fly ash, nano silicon dioxide and wood fiber to obtain the flexible reinforced material.

8. Use of the flexibility enhancing material according to any one of claims 1 to 6 as a tile glue flexibility enhancer.

9. Use according to claim 8, wherein the tile glue flexibility enhancer is added in an amount of 2-10 wt%, based on the total weight of the tile glue.

Technical Field

The invention belongs to the technical field of ceramic tile adhesive additives, and particularly relates to a flexible reinforcing material of ceramic tile adhesive as well as a preparation method and application thereof.

Background

The tile adhesive is also called as a ceramic tile adhesive or a binder, viscose cement and the like, is a novel material for modern decoration, replaces the traditional cement yellow sand, has adhesive bonding force which is several times that of cement mortar, can effectively adhere large-scale tile and stone, and avoids the risk of tile falling. The adhesive is mainly used for adhering decorative materials such as ceramic tiles, face bricks, floor tiles and the like, and is widely applied to decorative surface decorative places of buildings such as inner and outer wall surfaces, floors, bathrooms, kitchens and the like. However, for paving large or oversized boards and areas with large deformation of the base layer and large temperature difference, the flexibility of the tile adhesive is still insufficient, and the tile adhesive needs to be toughened; for example, patent application with publication number CN104230271A discloses a flexible tile adhesive, which comprises, by mass, 5-15 parts of ordinary portland cement, 65-85 parts of filler, 0.15-0.3 part of cellulose ether, 8-15 parts of adhesive, 0.05-0.5 part of lignin fiber, 0.10-0.3 part of thixotropic agent, and 0.10-0.2 part of water reducing agent; the application of the patent improves the flexibility and tensile bonding strength of the flexible adhesive by adding more redispersible latex powder into the tile adhesive, and further overcomes the phenomena of hollowing, falling or slow curing speed of the tile and the like when the traditional tile adhesive is bonded on a base layer with larger deformation such as a gypsum board, wood and the like; the application of the patent uses more redispersible latex powder, so that the problem of obviously improving the material cost of the tile adhesive exists. In addition, a patent with publication number CN104446230B discloses a scheme for improving flexibility of a tile adhesive by utilizing basalt fibers, which specifically comprises the following components in parts by weight: 35-45 parts of cement; 0.1-1 part of basalt fiber; 45-65 parts of sand; according to the ceramic tile adhesive, a basalt fiber component is introduced into a traditional ceramic tile adhesive formula, so that the heat-resistant adhesive strength and flexibility of the ceramic tile adhesive are improved. However, the addition of basalt fibers can only promote the flexibility of the adhesive to a certain extent, and the flexibility problem of the tile adhesive is difficult to solve fundamentally; meanwhile, the basalt fiber is a continuous fiber which is formed by melting natural basalt stone at 1450-1500 ℃ and drawing the natural basalt stone at high speed through a platinum-rhodium alloy wire drawing bushing, so that a large amount of energy consumption is required, and the problems of high energy consumption, environmental pollution, energy conservation and high price exist.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a flexible reinforced material for a tile adhesive, which can solve the flexibility problem of the tile adhesive, is environment-friendly and has low cost.

In order to achieve the above object, a first aspect of the present invention provides a flexible reinforcing material for tile glue, comprising, based on the total weight of the flexible reinforcing material: 40-80 wt% of metakaolin, 5-20 wt% of superfine mineral powder, 5-15 wt% of fly ash, 3-15 wt% of nano silicon dioxide and 4-20 wt% of wood fiber.

A second aspect of the present invention provides a method for preparing the above flexibility enhancing material, the method comprising: and uniformly mixing metakaolin, superfine mineral powder, fly ash, nano silicon dioxide and wood fiber to obtain the flexible reinforced material.

The third aspect of the invention provides the application of the flexibility reinforced material as a flexibility reinforcing agent of the tile glue.

The technical scheme of the invention has the following advantages:

(1) the flexible reinforcing material provided by the invention can obviously enhance the flexibility of the tile glue and can improve the bonding strength of the tile glue to a certain extent.

(2) The flexible reinforcing material can reduce the using amount of rubber powder or cement in the tile glue in the application of the tile glue, thereby saving the cost.

(3) The flexible reinforced material has low raw material cost and simple preparation process, and is suitable for industrial production and application.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Detailed Description

Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The first aspect of the present invention provides a flexible reinforcing material for tile glue, comprising, based on the total weight of the flexible reinforcing material: 40-80 wt% of metakaolin, 5-20 wt% of superfine mineral powder, 5-15 wt% of fly ash, 3-15 wt% of nano silicon dioxide and 4-20 wt% of wood fiber.

In the invention, the metakaolin is preferably 50-70 wt%, the nano-silica is preferably 5-15 wt%, and the wood fiber is preferably 8-18 wt%.

The inventor researches and discovers that: the tile glue is composed of a plurality of materials with large property difference, and interfaces with large property difference are formed in the chemical reaction process, such as various simple or complex multiphase combined interfaces formed among inorganic gelled products, organic polymers, sand, inert fine particles and fibers. Therefore, after the tile adhesive material is subjected to bending damage, some interfaces are tightly combined, the fracture surface is rough, some interfaces are weaker in combination, and the fracture surface is smooth. The organic polymer and the inorganic polymer are easy to generate excessive interfaces due to large difference of chemical properties, and when the excessive interface phenomenon is obvious, the flexibility exertion of the material is influenced, and the bending strength is reduced. Therefore, the flexibility of the tile glue cannot be obviously improved by adding wood fiber into the tile glue; therefore, the invention utilizes the synergistic effect of different materials to obviously improve the bonding performance between fiber-inorganic polymer interfaces, reduce the difference between the rigidity and the flexibility of the interfaces and increase the toughness of a polymer structure network, thereby improving the bending strength of the ceramic tile glue material, reducing the probability of pulling out fibers from a matrix and enhancing the flexibility of the material.

In the invention, the added metakaolin and the nano-silica are both ultrafine particles, the surfaces of the particles have high activated surface energy, the particles are easy to adsorb on the surface of wood fiber, and the particles are hydroxylated to generate C-S-H condensateGlue and ettringite; because the nucleation points are more, the crystal grain size is small, and the interface bonding strength is higher, the bonding performance between the wood fiber and the cement hydration substrate is enhanced. The activity of the superfine mineral powder is slightly inferior to that of nano silicon dioxide and metakaolin, but the superfine mineral powder has good adaptability to a cement polymer system, can form a plurality of activated silicon-oxygen tetrahedral structures through dissociation reaction to generate C-S-H gel and ettringite, can buffer the pH value of a solution while improving the strength and compactness of a matrix material, and can prevent the surface of a fiber from generating Ca (OH) with large crystal size₂And ettringite, thereby improving the compactness of the reaction product on the surface layer of the wood fiber, effectively enhancing the bonding property and fully playing the tensile property of the fiber in the bending process. On the other hand, the active ultrafine particles are uniformly distributed in the slurry, and the volume effect and the quantum tunnel effect of the active ultrafine particles can penetrate into the organic polymer to form a space network structure, so that the toughness of the polymer film is greatly improved, and meanwhile, the interfacial adhesion between the inorganic polymer and the organic polymer can be enhanced, and the flexibility of the material is improved.

According to the invention, the fineness of the metakaolin is preferably D90 which is more than or equal to 15 μm, and the mesh number is more than or equal to 1000 meshes.

In the invention, D90 is more than or equal to 15 mu m, which means that the material passing through the pore diameter of 15 mu m accounts for more than 90 percent of the total amount of the material.

According to the invention, the fineness of the superfine mineral powder is preferably that D90 is more than or equal to 15 mu m, the mesh number is more than or equal to 1000 meshes, and the 1-day activity index is more than or equal to 100%.

In the invention, the superfine mineral powder is a superfine part obtained by drying, grinding and sorting water-quenched blast furnace slag.

In the invention, D90 is more than or equal to 15 mu m, which means that the material passing through the pore diameter of 15 mu m accounts for more than 90 percent of the total amount of the material.

According to the invention, preferably, the strength activity index of the fly ash is more than or equal to 70 percent, the ignition loss is less than or equal to 8.0 percent, the content of free calcium oxide is less than or equal to 4.0 percent, and the balance of a 45-micron square-hole sieve is less than or equal to 25 percent.

In the invention, the fly ash is preferably fine ash captured from flue gas generated after coal combustion in a coal-fired power plant.

According to the present invention, preferably, the nano silica has an average particle size of 5 to 100 nm; preferably 10-50 nm.

According to the present invention, preferably, the length of the wood fiber is 0.5 to 10 mm.

A second aspect of the present invention provides a method for preparing the above flexibility enhancing material, the method comprising: and uniformly mixing metakaolin, superfine mineral powder, fly ash, nano silicon dioxide and wood fiber to obtain the flexible reinforced material.

The third aspect of the invention provides the application of the flexibility reinforced material as a flexibility reinforcing agent of the tile glue.

According to the present invention, preferably, the flexibility enhancer of the tile glue is added in an amount of 2-10 wt% based on the total weight of the tile glue.

In the invention, the tile glue in the total weight of the tile glue does not comprise a tile glue flexibility reinforcing agent.

The invention is further illustrated by the following examples:

the fineness of the metakaolin used in the following examples is D90 more than or equal to 15 μm, and the mesh number is 1250 meshes; the fineness of the superfine mineral powder is D90 which is more than or equal to 15 mu m, the mesh number is 1200 meshes, and the activity index of 1 day is 110 percent; the strength activity index of the fly ash (the fly ash is fine ash collected from flue gas generated by coal burning in a coal-fired power plant) is 73 percent, the loss on ignition is 3 percent, the content of free calcium oxide is 2 percent, and the balance of a 45-micron square-hole sieve is 18 percent; the average grain diameter of the nano silicon dioxide is 20 nm; the length of the wood fiber is 0.5 mm.

The following comparative and application examples used tile glues: MGH12 cellulose ether was purchased from Shanghai Huikang Fine chemical Co., Ltd, 5010N rubber powder from Wake chemical (China) Co., Ltd, and 5044N rubber powder from Wake chemical (China) Co., Ltd.