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CN-121974633-A - Basalt fiber-based strong-permeability tile adhesive and preparation method thereof

CN121974633ACN 121974633 ACN121974633 ACN 121974633ACN-121974633-A

Abstract

The application discloses a basalt fiber-based strong-permeability tile adhesive and a preparation method thereof. The tile adhesive comprises 40-60 parts of silicate cement, 50-80 parts of quartz sand, 0.5-1.5 parts of basalt fiber, 5-15 parts of redispersible emulsion powder and 2-5 parts of water-retaining agent, wherein the surface of the basalt fiber is subjected to phosphorylation treatment, the redispersible emulsion powder comprises a siloxane modified vinyl acetate-ethylene copolymer and long-chain alkyl grafted polyvinyl alcohol, the mass ratio of the siloxane modified vinyl acetate-ethylene copolymer to the basalt fiber is 3-4:1, and the siloxane modified vinyl acetate-ethylene copolymer is prepared by carrying out free radical copolymerization on a vinyl acetate-ethylene copolymer and an alkenyl siloxane compound, wherein the mass ratio of the vinyl acetate-ethylene copolymer to the alkenyl siloxane compound is 100:3-6. The application aims to solve the problems that the existing tile adhesive has low bonding strength and is easy to fall off due to hollowing in a high-humidity environment.

Inventors

  • WANG KUNHUA
  • LIANG XUAN
  • ZENG XIAOMIN

Assignees

  • 武汉德邦仕建材有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (10)

  1. 1. The basalt fiber-based strong-permeability tile adhesive is characterized by comprising the following components in parts by mass: 40-60 parts of Portland cement, 50-80 parts of quartz sand, 0.5-1.5 parts of basalt fiber, 5-15 parts of redispersible emulsion powder and 2-5 parts of water-retaining agent, wherein the surface of the basalt fiber is subjected to phosphorylation treatment, the redispersible emulsion powder comprises siloxane modified vinyl acetate-ethylene copolymer and long-chain alkyl grafted polyvinyl alcohol with the mass ratio of 3-4:1, and the siloxane modified vinyl acetate-ethylene copolymer is prepared by carrying out free radical copolymerization on vinyl acetate-ethylene copolymer and alkenyl siloxane compound with the mass ratio of 100:3-6.
  2. 2. The tile glue according to claim 1, wherein the water-retaining agent comprises cellulose ether, aluminum magnesium silicate and glycerin in a mass ratio of 1:1-2:0.5-1.
  3. 3. Tile glue according to claim 1, wherein the alkenylsiloxane compound is a (meth) acryloxysilane coupling agent and/or a vinylsilane coupling agent.
  4. 4. The tile glue of claim 1, wherein the vinyl acetate-ethylene copolymer has a glass transition temperature of-15 ℃ to 0 ℃.
  5. 5. The tile glue according to claim 1, wherein the siloxane modified vinyl acetate-ethylene copolymer is prepared by the following steps: Adding vinyl acetate-ethylene copolymer emulsion into a reaction kettle, heating to 70-85 ℃, mixing alkenyl siloxane compound and emulsifier under the protection of nitrogen, dripping into a reaction system, simultaneously adding a free radical initiator solution, controlling the dripping time to be 1-3 hours, carrying out heat preservation reaction for 1-2 hours after dripping, cooling to below 40 ℃, adjusting pH to 6.5-8.0, and carrying out spray drying to obtain the siloxane modified vinyl acetate-ethylene copolymer emulsion powder.
  6. 6. The tile glue according to claim 1, wherein the long-chain alkyl grafted polyvinyl alcohol is prepared by ring-opening etherification of polyvinyl alcohol and long-chain alkyl glycidyl ether with a mass ratio of 3-6:1 under the catalysis of alkali.
  7. 7. The tile glue of claim 6, wherein the long chain alkyl group has 8 to 14 carbon atoms.
  8. 8. The tile adhesive of claim 6, wherein the polyvinyl alcohol has a polymerization degree of 1000-2000 and an alcoholysis degree of 87-89%.
  9. 9. The tile glue according to claim 1, wherein the phosphorylation treatment is carried out by activating basalt fiber in alkaline solution, soaking in phosphoric acid solution with pH of 2-4 for 1-2 hours at 70-90 ℃, washing with water, and drying.
  10. 10. A preparation method of the basalt fiber-based strong-permeability tile adhesive is characterized by comprising the step of uniformly mixing silicate cement, quartz sand, basalt fibers, redispersible emulsion powder and a water-retaining agent according to the proportion of the tile adhesive in any one of claims 1-9.

Description

Basalt fiber-based strong-permeability tile adhesive and preparation method thereof Technical Field The application relates to the field of building materials, in particular to a basalt fiber-based strong-permeability tile adhesive and a preparation method thereof. Background The ceramic tile glue is used as a key bonding material for bonding ceramic tiles, vitrified tiles, rock plates and other facing materials in modern building decoration engineering, and has the core functions of forming a firm and durable bonding layer with certain deformation adaptability between a base material and the ceramic tiles so as to resist shearing and tensile stress caused by temperature change, base layer shrinkage, vibration or external force action, thereby avoiding the construction quality problems such as hollowness, cracking, falling and the like. The cement-based tile adhesives in wide use today are generally composed of portland cement, graded quartz sand, redispersible latex powder (RDP), cellulose ether and auxiliary additives. The cement provides a basic inorganic gel skeleton, quartz sand is used as aggregate to regulate the volume stability and the workability, and the redispersible emulsion powder and cellulose ether are used for constructing an organic-inorganic composite system together with the cement, wherein the cellulose ether ensures the cement to be fully hydrated through the water retention effect and simultaneously provides initial viscosity and anti-slip property, the redispersible emulsion powder forms a film again after water evaporation to form a continuous polymer network, penetrates through cement hydration products, and the flexibility, cohesive strength and the adhesion capability of the adhesive layer to the ceramic tile with low water absorption rate are obviously improved. The system effectively relieves the defects of high brittleness and easy cracking of the traditional pure cement mortar by introducing an organic polymer film, so that the ceramic tile adhesive has certain transverse deformability and meets the basic requirements in JC/T547 standard. The current mainstream redispersible emulsion powder is mainly based on vinyl acetate-ethylene copolymer (VAE), and has good film forming property and flexibility, but the polarity of vinyl acetate units in a molecular chain is limited, the chemical affinity with the interface of compact ceramic tiles and concrete substrates is weak, the hydrophilicity is strong, and the polymer film structure is deteriorated. This makes it difficult for the initial tensile bond strength and bond strength after submersion of tile adhesives to meet the high durability requirements of harsh environments, especially in high humidity, submersed scenes such as bathrooms, swimming pools, building facades, and the like. Disclosure of Invention The application provides a basalt fiber-based strong-permeability tile adhesive and a preparation method thereof, and aims to solve the technical problems that the existing tile adhesive is low in adhesive strength and easy to fall off in a hollowing manner in a high-humidity environment. In a first aspect, the application provides a basalt fiber-based strong-permeability tile adhesive, which comprises the following components in parts by mass: 40-60 parts of Portland cement, 50-80 parts of quartz sand, 0.5-1.5 parts of basalt fiber, 5-15 parts of redispersible emulsion powder and 2-5 parts of water-retaining agent, wherein the surface of the basalt fiber is subjected to phosphorylation treatment, the redispersible emulsion powder comprises siloxane modified vinyl acetate-ethylene copolymer and long-chain alkyl grafted polyvinyl alcohol with the mass ratio of 3-4:1, and the siloxane modified vinyl acetate-ethylene copolymer is prepared by carrying out free radical copolymerization on vinyl acetate-ethylene copolymer and alkenyl siloxane compound with the mass ratio of 100:3-6. The redispersible emulsion powder is formed by compounding the siloxane modified vinyl acetate-ethylene copolymer and the long-chain alkyl grafted polyvinyl alcohol, so that the initial tensile bonding strength and the tensile bonding strength after soaking are obviously improved while the construction performance of the tile adhesive is ensured. The siloxane units in the siloxane modified VAE can perform self-condensation reaction in the film forming process, and a Si-O-Si network is introduced into the polymer film, so that the network not only effectively prevents water from penetrating into the adhesive layer, but also greatly improves the bonding retention rate of the adhesive layer in severe environments such as long-term water immersion and the like, and relieves the problem of empty brick falling in wet areas such as bathrooms, outer walls and the like. Meanwhile, the siloxane group can be chemically bonded with Ca (OH) 2 or a concrete base in a cement hydration product, so that the interfacial adhesion between the polymer film and an inorganic