Water reducing agent for ceramic rock plate and preparation method of water reducing agent

Abstract

The invention discloses a water reducing agent for a ceramic rock plate. The water reducing agent is prepared from the following components in parts by weight: 10 to 40 parts of acrylic acid basic monomer, 5 to 15 parts of acrylic acid soft monomer, 0.5 to 5 parts of allyl functional monomer, 0.1 to 2 parts of chain transfer agent, 30 to 60 parts of deionized water, 0.1 to 5 parts of initiator and 5 to 20 parts of sodium hydroxide. The water reducer for the ceramic rock plate provided by the invention can improve the fluidity of a ceramic rock plate slurry system, and also can improve the strength of a ceramic rock plate blank.

Description

Technical Field

[0001] The present invention relates to the technical field of methods for preparing a water reducing agent for ceramic rock slabs, and in particular to a water reducing agent for ceramic rock slabs and a method for preparing the same. Background Art

[0002] Ceramic rock slabs have become a popular decorative material in recent years due to their large size, high strength, thin thickness and easy maintenance. In order to improve the strength of the green body, it is necessary to add reinforcing agents and use a large amount of bentonite. Due to its own properties, bentonite forms a flocculated structure in water, locking some water molecules, making it difficult to flow at a low water content, which is not conducive to production. Increasing the amount of water to increase the fluidity of the slurry will increase the energy consumption of the spray drying process, increase production costs and resource consumption. Therefore, it is urgent to develop a high-efficiency water reducer in the production process of ceramic rock slabs. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a water reducing agent for ceramic rock slabs, which can improve the fluidity of the ceramic rock slab slurry system and increase the strength of the ceramic rock slab blank.

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a water reducing agent for ceramic rock slabs, which has mature technology, simple production and stable quality.

[0005] In order to solve the above technical problems, the present invention provides a water reducing agent for ceramic rock slabs, which includes the following components in parts by weight: 10 to 40 parts of acrylic base monomer, 5 to 15 parts of acrylic soft monomer, 0.5 to 5 parts of acrylic functional monomer, 0.1 to 2 parts of chain transfer agent, 30 to 60 parts of deionized water, 0.1 to 5 parts of initiator, and 5 to 20 parts of sodium hydroxide.

[0006] In some embodiments, the acrylic acid base monomer is one or more of acrylic acid, methacrylic acid, and methylene succinic acid.

[0007] In some embodiments, the acrylic soft monomer is one or more of ethyl acrylate, isooctyl acrylate, and n-butyl acrylate.

[0008] In some embodiments, the acryl functional monomer is methyl acryl glycidyl ether and 2-acrylamido-2-methylbenzenesulfonic acid; The ratio of the added amounts of the methyl acryloyl glycidyl ether and 2-acrylamide-2-methylbenzenesulfonic acid is (1-2): (1-3).

[0009] In some embodiments, the chain transfer agent is one or more of sodium hypophosphite, 2,4-diphenyl-4-methyl-1-pentene, and sodium bisulfite.

[0010] In some embodiments, the initiator is one or more of ammonium persulfate, sodium persulfate, and potassium persulfate. In order to solve the above problems, the present invention also provides a method for preparing a water reducing agent for ceramic rock slabs, comprising the following steps: Mix some deionized water and initiator into a container, raise the temperature to 79℃~85℃ under nitrogen protection and keep blowing oxygen; Mixing acrylic acid base monomer, acrylic acid soft monomer, acrylic functional monomer and chain transfer agent in proportion to obtain a monomer mixture; mixing the remaining initiator and deionized water to obtain an initiator aqueous solution; Add the monomer mixture and the initiator aqueous solution dropwise into the container at 79° C. to 85° C., and continue to maintain the temperature at 79° C. to 85° C. after the addition is completed; The temperature was lowered to 40°C-50°C, and an aqueous sodium hydroxide solution was added dropwise into the container.

[0011] In some embodiments, the temperature is raised to 79° C. to 85° C. under nitrogen protection and maintained with oxygen blowing for 30 min to 40 min.

[0012] In some embodiments, the monomer mixture and the initiator aqueous solution are added dropwise to the container at 79°C-85°C for 120min-180min. After the addition is completed, the temperature is maintained at 79°C-85°C for 150min-180min.

[0013] In some embodiments, the temperature is lowered to 40° C. to 50° C., and an aqueous sodium hydroxide solution is added dropwise to the container for 120 min to 180 min.

[0014] The implementation of the present invention has the following beneficial effects: The water reducer for ceramic rock slabs provided by the present invention comprises acrylic base monomers, acrylic soft monomers and acrylic functional monomers which, under the action of an initiator, are polymerized together through the steps of free radical initiation, growth and termination to form a water reducer having a specific molecular structure and performance. The obtained water reducer is suitable for the field of ceramic rock slabs and can significantly improve the fluidity of the ceramic rock slab slurry system and increase the strength of the ceramic rock slab blank under the condition of a relatively small addition amount. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0017] In the present invention, “preferred” is only used to describe an implementation method or example with better effects, and it should be understood that it does not constitute a limitation on the protection scope of the present invention.

[0018] In the present invention, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0019] To solve the above problems, the present invention provides a water reducing agent for ceramic rock slabs, which includes the following components in parts by weight: 10 to 40 parts of acrylic base monomer, 5 to 15 parts of acrylic soft monomer, 0.5 to 5 parts of acrylic functional monomer, 0.1 to 2 parts of chain transfer agent, 30 to 60 parts of deionized water, 0.1 to 5 parts of initiator, and 5 to 20 parts of sodium hydroxide.

[0020] The water reducer for ceramic rock slabs provided by the present invention is polymerized with carboxylic acid monomers by introducing different types of monomers, thereby changing the molecular structure and performance of the water reducer. Specifically, the present invention is based on the principle of free radical polymerization. During the reaction, acrylic acid base monomers, acrylic acid soft monomers, and acrylic functional monomers are polymerized together into a water reducer with a specific molecular structure and performance through the steps of free radical initiation, growth, and termination under the action of an initiator. The obtained water reducer is suitable for the field of ceramic rock slabs. Under the condition of a small amount of addition, it can significantly improve the fluidity of the ceramic rock slab slurry system and increase the strength of the ceramic rock slab blank.

[0021] Specifically, in some embodiments, the acrylic acid base monomer is one or more of acrylic acid, methacrylic acid, and methylene succinic acid. Exemplary weight parts of the acrylic acid base monomer are 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, and 40 parts, but are not limited thereto.

[0022] In some embodiments, the acrylic soft monomer is one or more of ethyl acrylate, isooctyl acrylate, and n-butyl acrylate. Exemplary weight parts of the acrylic base monomer are 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, and 15 parts, but are not limited thereto.

[0023] It should be noted that for ceramic rock slabs, a large amount of bentonite is needed to improve the strength of the green body. 4+ Easy to be Al 3+ , P 5+ Substitution, Al in the octahedral layer 3+ Easily Fe 3+ 、Zn 2+ Mg 2+ At the same time, bentonite has strong water absorption, so it is easy to form large micelles with negative charges in the mud of ceramic rock slabs. The above-mentioned acrylic acid base monomers, acrylic acid soft monomers, and acrylic functional monomers provided by the present invention are polymerized together to form a water reducer with a specific molecular structure, which can exchange or adsorb with the cations on the surface of bentonite particles, thereby forming a stable adsorption layer on the surface of bentonite particles, and electrostatic repulsion is generated between the adsorption layers, so that the bentonite particles repel each other, thereby maintaining the dispersion and fluidity of the ceramic rock slab slurry. Among them, the addition of acrylic acid soft monomers increases the long-chain polymer structure, which can form a steric hindrance layer around the bentonite particles, hindering direct contact and agglomeration between particles.

[0024] In some embodiments, the acryl functional monomer is methyl methacrylate glycidyl ether and 2-acrylamide-2-methylbenzenesulfonic acid. Exemplary weight portions of the acryl functional monomer are 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, and 5 parts, but are not limited thereto. The introduction of the acryl functional monomer can enhance the slump retention performance of the water reducer and adjust the spatial structure of the water reducer molecule, increase the zeta potential of the particles in the system, and keep the ceramic rock slab slurry in a good fluidity and stability for a long time. Further, the epoxy group in the methyl methacrylate glycidyl ether molecule makes it have a high reactivity, and can react with the rock slab blank material, thereby improving the bonding force between the particles of the rock slab blank material, making the dried rock slab more dense and firm, and significantly improving the blank strength. The sulfonic acid group in the molecular structure of 2-acrylamide-2-methylbenzenesulfonic acid provides an important functional group for the water reducer. The sulfonic acid group has a strong polarity and can be highly ionized in water to form negatively charged ions. These ions can be adsorbed on the surface of the blank slurry to form a hydration film with the same charge. Due to the repulsion between the same charges, the agglomeration phenomenon between the slurry particles is weakened, thereby improving the dispersibility of the slurry particles. Preferably, the ratio of the amount of methacrylic glycidyl ether and 2-acrylamide-2-methylbenzenesulfonic acid added is (1~2): (1~3). More preferably, the ratio of the amount of methacrylic glycidyl ether and 2-acrylamide-2-methylbenzenesulfonic acid added is 1: (2~3). This can increase the strength of the ceramic rock slab blank while ensuring fluidity.

[0025] In some embodiments, the chain transfer agent is one or more of sodium hypophosphite, 2,4-diphenyl-4-methyl-1-pentene, and sodium bisulfite. Exemplary weight parts of the chain transfer agent are 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 parts, 1.2 parts, 1.4 parts, 1.6 parts, and 1.8 parts, but are not limited thereto.

[0026] In some embodiments, the initiator is one or more of ammonium persulfate, sodium persulfate, and potassium persulfate. The exemplary weight parts of the initiator are 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, and 4.5 parts, but are not limited thereto. The exemplary weight parts of the deionized water are 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, and 60 parts, but are not limited thereto. The exemplary weight parts of the sodium hydroxide are 10 parts, 15 parts, and 20 parts, but are not limited thereto.

[0027] Accordingly, the present invention also provides a method for preparing a water reducing agent for a ceramic rock plate, comprising the following steps: S1. Mix some deionized water and initiator into a container, raise the temperature to 79°C~85°C under nitrogen protection and keep blowing oxygen; In some embodiments, the temperature is raised to 79° C. to 85° C. under nitrogen protection and maintained with oxygen blowing for 30 min to 40 min.

[0028] S2, mixing acrylic acid base monomer, acrylic acid soft monomer, acrylic functional monomer and chain transfer agent in proportion to obtain a monomer mixture; S3, mixing the remaining initiator and deionized water to obtain an initiator aqueous solution; S4, adding the monomer mixture and the initiator aqueous solution dropwise into the container at 79° C. to 85° C., and continuing to maintain the temperature at 79° C. to 85° C. after the addition is completed; In some embodiments, the monomer mixture and the initiator aqueous solution are added dropwise to the container at 79°C-85°C for 120min-180min. After the addition is completed, the temperature is maintained at 79°C-85°C for 150min-180min.

[0029] S5. Cool the container to 40°C-50°C and add sodium hydroxide aqueous solution dropwise into the container.

[0030] In some embodiments, the temperature is lowered to 40° C. to 50° C., and an aqueous sodium hydroxide solution is added dropwise to the container for 120 min to 180 min.

[0031] The preparation method of the water reducer for ceramic rock slabs provided by the present invention has mature technology, simple production and stable quality. The prepared water reducer for ceramic rock slabs can significantly improve the fluidity of the ceramic rock slab slurry system and increase the strength of the ceramic rock slab blank under the condition of a small addition amount.

[0032] The present invention is further described below with specific embodiments: Example 1 This embodiment provides a water reducing agent for ceramic rock plate and a preparation method thereof, comprising the following steps: 21.92 g of deionized water and 0.49 g of initiator (ammonium persulfate) were placed in a four-necked flask, and the temperature was raised to 82° C. under nitrogen protection and oxygen blowing was maintained for 30 min.

[0033] A monomer mixture comprising 24.63 g of acrylic acid base monomer (20 g of acrylic acid, 4.63 g of methacrylic acid), 8.93 g of acrylic acid soft monomer (5.93 g of isooctyl acrylate, 3 g of n-butyl acrylate), 1.79 g of acryl functional monomer (the methyl acryl glycidyl ether and 2-acrylamido-2-methylbenzenesulfonic acid, the ratio of the added amounts of the two being 1:3), and 0.37 g of a chain transfer agent (sodium hypophosphite) is uniformly mixed in proportion.

[0034] 0.49 g of initiator (ammonium persulfate) and 4.43 g of deionized water were mixed to obtain an initiator aqueous solution.

[0035] The monomer mixture and the initiator aqueous solution were added dropwise at 82°C for 150 min. After the addition, the temperature was kept at 82°C for 180 min.

[0036] The temperature was lowered to 50°C, and a sodium hydroxide aqueous solution of 12.32 g of sodium hydroxide and 24.63 g of water was added dropwise for 120 minutes to obtain a water reducing agent for ceramic rock slabs.

[0037] Example 2 This embodiment provides a water reducing agent for ceramic rock plate and a preparation method thereof, comprising the following steps: 21.92 g of deionized water and 0.3 g of initiator (ammonium persulfate) were placed in a four-necked flask, and the temperature was raised to 82° C. under nitrogen protection and oxygen blowing was maintained for 30 min.

[0038] A monomer mixture is prepared by mixing 24.63 g of acrylic acid base monomer (18 g of acrylic acid, 6.63 g of methacrylic acid), 8.93 g of acrylic acid soft monomer (2.93 g of isooctyl acrylate and 6 g of n-butyl acrylate), 1.79 g of acryl functional monomer (the aforementioned methyl acryl glycidyl ether and 2-acrylamido-2-methylbenzenesulfonic acid, the ratio of the added amounts of the two being 1:3), and 0.25 g of a chain transfer agent (sodium hypophosphite) in a uniform proportion.

[0039] 0.3 g of initiator (ammonium persulfate) and 4.43 g of deionized water were mixed to obtain an initiator aqueous solution.

[0040] The monomer mixture and the initiator aqueous solution were added dropwise at 82°C for 150 min. After the addition, the temperature was kept at 82°C for 180 min.

[0041] The temperature was lowered to 50°C, and a sodium hydroxide aqueous solution of 12.32 g of sodium hydroxide and 24.63 g of water was added dropwise for 120 minutes to obtain a water reducing agent for ceramic rock slabs.

[0042] Embodiment 3: This embodiment provides a water reducing agent for ceramic rock plate and a preparation method thereof, comprising the following steps: 21.92 g of deionized water and 0.4 g of initiator (sodium persulfate) were placed in a four-necked flask, and the temperature was raised to 83° C. under nitrogen protection and oxygen blowing was maintained for 30 min.

[0043] A monomer mixture is prepared by mixing 24.63 g of acrylic acid base monomer (15 g of acrylic acid, 9.63 g of methylene succinic acid), 8.93 g of acrylic acid soft monomer (3.93 g of isooctyl acrylate and 5 g of n-butyl acrylate), 1.79 g of acryl functional monomer (the aforementioned methyl acryl glycidyl ether and 2-acrylamido-2-methylbenzenesulfonic acid, the ratio of the added amounts of the two being 1:3), and 0.4 g of a chain transfer agent (2,4-diphenyl-4-methyl-1-pentene) in a uniform proportion.

[0044] 0.4 g of initiator (sodium persulfate) and 4.43 g of deionized water were mixed to obtain an initiator aqueous solution.

[0045] The monomer mixture and the initiator aqueous solution were added dropwise at 83°C for 150 min. After the addition, the temperature was kept at 83°C for 180 min.

[0046] The temperature was lowered to 50°C, and a sodium hydroxide aqueous solution of 12.32 g of sodium hydroxide and 24.63 g of water was added dropwise for 120 minutes to obtain a water reducing agent for ceramic rock slabs.

[0047] Comparative Example 1 Commercially available water glass water reducer.

[0048] Comparison Examples 1 to 3 and the obtained ceramic rock plate water reducer and the commonly used water glass water reducer were compared. First, the dispersion effect of the water reducer was evaluated. The specific method is as follows: Prepare materials: ball mill, 500g ball mill jar, 500g zirconium beads, Tu-4 viscosity cup, stopwatch, ceramic rock powder, 80 mesh sieve, etc.

[0049] Preparation of slurry: 100g of ceramic rock powder, 60g of deionized water, 0.6g of water reducer, and 500g of zirconium beads were put into a 500g ball mill jar in sequence, and ball milled for 7 minutes.

[0050] Test slurry: The slurry after ball milling was immediately filtered through an 80-mesh screen and its viscosity was tested using a Tu-4 cup. The specific results are shown in Table 1.

[0051] Then, the ceramic rock slab water reducer prepared in Examples 1 to 3 and the commonly used water glass water reducer were applied to the actual production of ceramic rock slabs to test the strength of the ceramic rock slab blanks.

[0052] Table 1 Performance of water reducing agent for ceramic rock plate prepared in Examples 1 to 3

[0053] It can be seen from the above results that the water reducer for ceramic rock slabs provided by the present invention is polymerized with carboxylic acid monomers by introducing different types of monomers, thereby changing the molecular structure and performance of the water reducer. Specifically, the present invention is based on the principle of free radical polymerization. During the reaction, acrylic acid base monomers, acrylic acid soft monomers, and acrylic functional monomers are polymerized together into a water reducer with a specific molecular structure and performance through the steps of free radical initiation, growth, and termination under the action of an initiator. The obtained water reducer is suitable for the field of ceramic rock slabs. Under the condition of a small amount of addition, it can significantly improve the fluidity of the ceramic rock slab slurry system and increase the strength of the ceramic rock slab blank.

[0054] The above is a preferred embodiment of the invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the invention. These improvements and modifications are also considered to be within the scope of protection of the invention.

Claims

1. A water reducing agent for ceramic rock slabs, characterized in that: The composition includes the following components in parts by weight: 10 to 40 parts of acrylic acid base monomer, 5 to 15 parts of acrylic acid soft monomer, 0.5 to 5 parts of acrylic functional monomer, 0.1 to 2 parts of chain transfer agent, 30 to 60 parts of deionized water, 0.1 to 5 parts of initiator and 5 to 20 parts of sodium hydroxide.

2. The water reducing agent for ceramic rock plate according to claim 1, characterized in that: The acrylic acid base monomer is one or more of acrylic acid, methacrylic acid, and methylene succinic acid.

3. The water reducing agent for ceramic rock plate according to claim 1, characterized in that: The acrylic soft monomer is one or more of ethyl acrylate, isooctyl acrylate, and n-butyl acrylate.

4. The water reducing agent for ceramic rock plate according to claim 1, characterized in that: The acrylic functional monomers are methyl acrylic glycidyl ether and 2-acrylamide-2-methylbenzenesulfonic acid; The ratio of the added amounts of the methyl acryloyl glycidyl ether and 2-acrylamide-2-methylbenzenesulfonic acid is (1-2):(1-3).

5. The water reducing agent for ceramic rock plate according to claim 1, characterized in that: The chain transfer agent is one or more of sodium hypophosphite, 2,4-diphenyl-4-methyl-1-pentene, and sodium bisulfite.

6. The water reducing agent for ceramic rock plate according to claim 1, characterized in that: The initiator is one or more of ammonium persulfate, sodium persulfate, and potassium persulfate.

7. A method for preparing a water reducing agent for ceramic rock slabs according to any one of claims 1 to 6, characterized in that: The following steps are involved: Mix some deionized water and initiator into a container, raise the temperature to 79℃~85℃ under nitrogen protection and keep blowing oxygen; Mixing acrylic acid base monomer, acrylic acid soft monomer, acrylic functional monomer and chain transfer agent in proportion to obtain a monomer mixture; mixing the remaining initiator and deionized water to obtain an initiator aqueous solution; Add the monomer mixture and the initiator aqueous solution dropwise into the container at 79° C. to 85° C., and continue to maintain the temperature at 79° C. to 85° C. after the addition is completed; The temperature was lowered to 40°C to 50°C, and an aqueous sodium hydroxide solution was added dropwise into the container.

8. The method for preparing a water reducing agent for ceramic rock plate according to claim 7, characterized in that: Under nitrogen protection, the temperature was raised to 79°C to 85°C and oxygen blowing was maintained for 30min to 40min.

9. The method for preparing a water reducing agent for ceramic rock plate according to claim 7, characterized in that: The monomer mixture and the initiator aqueous solution are added dropwise into the container at 79° C. to 85° C. for 120 min to 180 min. After the addition is completed, the temperature is maintained at 79° C. to 85° C. for 150 min to 180 min.

10. The method for preparing a water reducing agent for ceramic rock plate according to claim 7, characterized in that: The temperature was lowered to 40° C. to 50° C., and an aqueous sodium hydroxide solution was added dropwise to the container for 120 min to 180 min.

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