High-performance phosphorus II type anhydrite-based tile adhesive

Abstract

The invention belongs to the technical field of ardealite products, and particularly relates to a high-performance phosphorus II type anhydrite-based tile adhesive. The building material is prepared from the following raw materials in parts by weight: 45-60 parts of phosphorus II type anhydrite, 30-40 parts of quartz sand, 3-5 parts of cement, 3-5 parts of metakaolin, 2-5 parts of mineral powder, 2-5 parts of silica fume, 0.6-1.8 parts of latex powder, 0.05-0.12 part of a water reducing agent, 0.1-0.25 part of cellulose ether, a waterproof agent and 0.10-0.15 part of a retarder. The prepared high-performance phosphorus II type anhydrite-based ceramic tile adhesive is high in strength, good in water resistance, low in shrinkage rate, free of hollowing and cracking and high in cost performance, has a certain fire-resistant effect, and forms a complete industrial chain with a phosphogypsum product system mainly pushed in the market, so that the worry of customers at application ends on selecting phosphogypsum building material products is eliminated.

Description

Technical Field

[0001] The present application belongs to the technical field of phosphogypsum products, and in particular to a high-performance phosphogypsum II anhydrous gypsum-based tile adhesive. Background Art

[0002] Accelerating the technological innovation of comprehensive utilization of phosphogypsum and realizing the transformation of waste into treasure and harm into benefit has become an important technical and economic policy in my country's economic construction and an urgent problem that needs to be solved in order to achieve sustainable development.

[0003] Traditional tile adhesives are mainly cement-based and widely used in exterior wall tiling. With the ban on exterior wall veneer tiles, the industry structure of tile adhesives is facing adjustments, and the application scenarios have shifted from outdoor to indoor, creating favorable conditions for the launch and application of gypsum-based indoor tile adhesives, and the prospects are broad.

[0004] In addition, with the need for large-scale consumption of industrial by-product gypsum, it has become a general trend for indoor non-structural materials to replace cement with gypsum. At present, East China and Sichuan and Chongqing have fully promoted the residential building floating floor insulation and sound insulation system and elastic cushion floating floor insulation and sound insulation system. Both systems use a large amount of self-leveling gypsum to replace traditional fine stone concrete as leveling material; in addition, Guizhou Province vigorously promotes gypsum-based self-leveling mortar, which is mainly used to paste floor tiles for surface decoration, so the market demand for tile adhesive is huge.

[0005] In summary, making full use of phosphogypsum in the production of tile adhesive is the current key research direction. It can solve the technical bottleneck of existing gypsum-based surface tile tiling, create a complete gypsum building materials industry chain, promote the large-scale utilization of phosphogypsum-related products, and create significant environmental, economic and social benefits. Summary of the invention

[0006] In order to solve the above technical problems existing in the prior art, the present application provides a high-performance phosphorus II type anhydrous gypsum-based tile adhesive, which is specifically achieved through the following technical solutions:

[0007] A high-performance phosphorus II anhydrous gypsum-based tile adhesive is prepared from the following raw materials in parts by weight: 45-60 parts of phosphorus II anhydrous gypsum, 30-40 parts of quartz sand, 3-5 parts of cement, 3-5 parts of metakaolin, 2-5 parts of mineral powder, 2-5 parts of silica fume, 0.6-1.8 parts of latex powder, 0.05-0.12 parts of water reducing agent, 0.1-0.25 parts of cellulose ether, and 0.10-0.15 parts of waterproofing agent and retarder.

[0008] Furthermore, the phosphorus type II anhydrous gypsum is a powder material obtained by calcining phosphogypsum (CaSO4:2H2O) at a certain temperature to form type II anhydrous gypsum (II-CaSO4) as a main component, and then grinding and modifying it.

[0009] The phosphorus type II anhydrous gypsum is mainly an anhydrous gypsum prepared by medium-high temperature calcination (600°C-850°C). The harmless transformation of harmful impurities is achieved by medium-temperature calcination, the negative impact of harmful impurities on the performance of phosphogypsum is eliminated, and the performance and quality stability of downstream products are guaranteed. The cementitious material after active activation has the characteristics of fast coagulation and hardening, slight volume expansion, high bonding strength, etc., which is highly consistent with the index requirements of indoor tile adhesive technology and wall bonding materials, and the main hydration product of the cementitious material, calcium sulfate dihydrate, has good compatibility with the gypsum base material; the cement is P·O 42.5.

[0010] Furthermore, the quartz sand is quartz particles obtained by crushing quartz stone, wherein the mass content of 30-70 mesh sand is 60-65%, and the mass content of 70-120 mesh sand is 35-40%.

[0011] Furthermore, the cement has a P·O content of 42.5.

[0012] Furthermore, the water reducer is a polycarboxylic acid high performance water reducer.

[0013] Furthermore, the cellulose is hydroxypropyl methyl cellulose with a viscosity of 80,000 Pa·s to 120,000 Pa·s.

[0014] Furthermore, the mineral powder is slag powder obtained by grinding the slag from the steel plant with a small amount of gypsum, and its specific surface area reaches 450-500 m2 / kg and its activity index reaches above 95 (S95 grade).

[0015] Furthermore, the metakaolin is a product formed after kaolin is calcined at high temperature. The high temperature calcination is calcined at 500-900°C. The final main component is amorphous aluminum silicate. It is widely used in the construction industry. Because it has volcanic ash activity, it can react with calcium hydroxide to form gelling substances such as hydrated calcium silicate, which can improve the strength and durability of materials such as concrete.

[0016] Furthermore, the silica fume is obtained by collecting and treating the smoke and dust emitted with the exhaust gas during the high-temperature smelting of industrial silicon and ferrosilicon in industrial electric furnaces through special capture devices; the main component is silicon dioxide, and its content can generally reach 85%-97%. Its particles are extremely small, with an average particle size of about 0.1-0.3μm, which is one hundredth of the particle size of cement particles. It has many applications in the field of building materials. For example, adding silica fume to concrete can fill the gaps between cement particles and improve the strength and density of concrete; it can also improve the durability of concrete and enhance its anti-seepage and anti-chemical erosion properties. In the refractory industry, silica fume can also increase the strength and density of refractory materials.

[0017] Furthermore, the latex powder is VAE redispersible latex powder.

[0018] Furthermore, the waterproofing agent is a chemical agent that can play a waterproofing role. In terms of ingredients, there are waterproofing agents with fatty acids as the main component, and waterproofing agents with silicone as the main component. For example, fatty acid waterproofing agents can react with components in cement to form a hydrophobic film in the pores of materials such as concrete to prevent the entry of water. In the field of construction, adding waterproofing agents to cement mortar or concrete can improve the waterproof performance of these building materials and be used in construction in places such as basements and pools that are easily exposed to water. In the textile industry, waterproofing agents can be used to treat fabrics to make the fabrics waterproof, just like some outdoor clothing can withstand rain after being treated with waterproofing agents.

[0019] Furthermore, the retarder is a protein-based gypsum retarder.

[0020] Compared with the prior art, the technical effects created by this application are embodied in:

[0021] The high-performance phosphorus II anhydrous gypsum-based tile adhesive prepared by the present invention has high strength, good water resistance, low shrinkage, no hollowing or cracking, high cost performance, and certain fire resistance, and forms a complete industrial chain with the main phosphogypsum product system promoted on the market, thereby eliminating the concerns of application-end customers in choosing phosphogypsum building materials products.

[0022] The high-performance phosphorus II anhydrous gypsum-based tile adhesive prepared in this application also has the following advantages:

[0023] 1. Save space: Unlike cement, which requires a thick layer, tile adhesive only needs a thin layer. If the construction process is up to standard, the tiles will stick very firmly. It can also reduce waste, has no toxic additives, and simplifies the construction steps. It can be used by adding water and stirring on site. There is no need to soak the bricks or wet the wall before laying the tiles.

[0024] 2. Good performance stability: As a new type of material, it replaces the traditional cement and yellow sand. The adhesive strength is several times that of cement, and it is resistant to water, freeze-thaw and aging. It is an ideal bonding material. The viscosity of gypsum tile adhesive itself can eliminate hollowing and cracking, reducing the possibility of rework.

[0025] 3. High safety: If the wall tiles are not firmly attached, it is very scary that they will fall and hit people. Therefore, when attaching wall tiles, you should choose materials with strong adhesion, and tile adhesive can just meet this requirement. It has high adhesion and can firmly adhere to the tiles to prevent them from falling off. The higher adhesion strength is 2-3 times that of cement, and the tiles will not fall off when being attached. DETAILED DESCRIPTION

[0026] The technical solution of the present application is further limited below in conjunction with specific implementation methods, but the scope of protection required is not limited to the description.

[0027] Example 1

[0028] 1. A high-performance phosphorus II anhydrous gypsum-based tile adhesive is made of the following raw materials in parts by weight: 45 parts of phosphorus II anhydrous gypsum, 40 parts of quartz sand, 5 parts of cement, 5 parts of metakaolin, 3 parts of mineral powder, 2 parts of silica fume, 0.8 parts of latex powder, 0.05 parts of water reducer, 0.1 parts of cellulose ether, and 0.15 parts of retarder.

[0029] Example 2

[0030] 1. A high-performance phosphorus II type anhydrous gypsum-based tile adhesive is made of the following raw materials in parts by weight: 55 parts of type II anhydrous gypsum, 30 parts of quartz sand, 5 parts of cement, 5 parts of metakaolin, 3 parts of mineral powder, 2 parts of silica fume, 1.1 parts of latex powder, 0.07 parts of water reducing agent, 0.1 parts of water retaining agent, and 0.16 parts of retarder.

[0031] Example 3

[0032] 1. A high-performance phosphorus II type anhydrous gypsum-based tile adhesive is made of the following raw materials in parts by weight: 55 parts of type II anhydrous gypsum, 30 parts of quartz sand, 5 parts of cement, 5 parts of metakaolin, 3 parts of mineral powder, 2 parts of silica fume, 1.2 parts of latex powder, 0.09 parts of water reducing agent, 0.12 parts of water retaining agent, and 0.18 parts of retarder.

[0033] Example 4

[0034] 1. A high-performance phosphorus II type anhydrous gypsum-based tile adhesive is made of the following raw materials in parts by weight: 55 parts of type II anhydrous gypsum, 30 parts of quartz sand, 5 parts of cement, 5 parts of metakaolin, 3 parts of mineral powder, 2 parts of silica fume, 1.2 parts of latex powder, 0.12 parts of water reducing agent, 0.12 parts of water retaining agent, and 0.18 parts of retarder.

[0035] Comparative Example 1

[0036] Use commercially available tile adhesive.

[0037] After mixing each example, 20% of water was added and stirred evenly to form a paste.

[0038] In the comparative example, commercially available tile adhesive was prepared into slurry according to the package instructions.

[0039] In order to further illustrate that the present invention can achieve the technical effect, the tensile bonding strength / MPa, tensile bonding strength after immersion in water / MPa, tensile bonding strength after heat aging / MPa, tensile bonding strength after freeze-thaw cycle / MPa, and air-standing time ≥20min of the slurry prepared in Example 1 of the gypsum-based tile adhesive comparative example 1 in the application process are tested, and the specific experimental results are shown in Table 1.

[0040]

[0041]

[0042] Finally, it should be pointed out that the above embodiments are only representative examples of the present application. Obviously, the technical solution of the present application is not limited to the above embodiments, and there may be many variations. All variations that can be directly derived or associated with the contents disclosed in the present application by a person of ordinary skill in the art should be considered as the protection scope of the present application.

Claims

1. A high-performance phosphorus II anhydrous gypsum-based tile adhesive, characterized in that: The invention is prepared from the following raw materials in parts by weight: 45-60 parts of phosphorus type II anhydrous gypsum, 30-40 parts of quartz sand, 3-5 parts of cement, 3-5 parts of metakaolin, 2-5 parts of mineral powder, 2-5 parts of silica fume, 0.6-1.8 parts of latex powder, 0.05-0.12 parts of water reducing agent, 0.1-0.25 parts of cellulose ether, and 0.10-0.15 parts of waterproofing agent and retarder.

2. The high performance phosphorus II type anhydrous gypsum-based tile adhesive according to claim 1, characterized in that: The phosphorus type II anhydrous gypsum is a powder material obtained by calcining phosphogypsum at a certain temperature and taking type II anhydrous gypsum as the main component, and then grinding and modifying it.

3. The high performance phosphorus II type anhydrous gypsum-based tile adhesive according to claim 1, characterized in that: The quartz sand is quartz particles obtained by crushing quartz stone, wherein the mass content of 30-70 mesh sand is 60-65%, and the mass content of 70-120 mesh sand is 35-40%.

4. The high performance phosphorus II type anhydrous gypsum-based tile adhesive according to claim 1, characterized in that: The cement has a P·O content of 42.

5.

5. The high performance phosphorus II type anhydrous gypsum-based tile adhesive according to claim 1, characterized in that: The water reducing agent is a polycarboxylic acid high performance water reducing agent.

6. The high performance phosphorus II type anhydrous gypsum-based tile adhesive according to claim 1, characterized in that: The cellulose is hydroxypropyl methyl cellulose, and has a viscosity of 80,000 Pa·s to 120,000 Pa·s.

7. The high performance phosphorus II type anhydrous gypsum-based tile adhesive according to claim 1, characterized in that: The mineral powder is slag powder obtained by grinding the water slag from the steel plant with a small amount of gypsum, and the specific surface area reaches 450-500 m2 / kg and the activity index reaches more than 95.

8. The high performance phosphorus II type anhydrous gypsum-based tile adhesive according to claim 1, characterized in that: The metakaolin is a product formed after kaolin is calcined at high temperature.

9. The high performance phosphorus II type anhydrous gypsum-based tile adhesive according to claim 1, characterized in that: The silica ash is obtained by collecting and treating the smoke and dust emitted with the exhaust gas during the high-temperature smelting of industrial silicon and ferrosilicon in industrial electric furnaces through a special capture device; the main component is silicon dioxide.

10. The high performance phosphorus II type anhydrous gypsum-based tile adhesive according to claim 1, characterized in that: The latex powder is VAE redispersible latex powder.

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