plaster products

Abstract

To provide gypsum products with high compressive strength. [Solution] The gypsum product includes a gypsum body. The gypsum body is formed by a gypsum slurry. The gypsum slurry includes water, gypsum powder, and a reinforcing agent. The reinforcing agent includes a polymer component and a silicon compound component. The polymer component includes triacetylcellulose, polyester material, and iodized polyvinyl alcohol. The iodized polyvinyl alcohol is formed from polyvinyl alcohol and an iodine source. The gypsum product of the present invention, manufactured using the aforementioned reinforcing agent, has high compressive strength.

Description

Technical Field

[0001] The present invention relates to gypsum, and particularly to gypsum products containing a strengthening agent.

Background Art

[0002] Conventional gypsum products, such as gypsum bricks or gypsum boards, are widely used in the construction field because they have low raw material costs, excellent fire resistance, and are easy to construct. However, these products themselves have disadvantages such as low strength, brittleness, and susceptibility to moisture, which limit their applications.

[0003] In order to improve the above problems, various technical means have been developed in the industry. For example, by adding fiber materials such as glass fibers or wood fibers to gypsum slurry, the compressive strength and toughness of gypsum products are improved. However, such fiber materials have high water absorption or poor compatibility with gypsum slurry, so their performance deteriorates in a humid environment, and defects may occur in the appearance.

[0004] Therefore, developing a new type of strengthening agent that can significantly enhance the compressive strength and structural stability of gypsum products, without damaging the appearance, without adversely affecting the functions of other additives, and further imparting antibacterial properties, has become an urgent technical problem in this field.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, an object of the present invention is to provide a gypsum product having a high compressive strength.

Means for Solving the Problems

[0006] The gypsum product of the present invention includes a gypsum body. The gypsum body is formed by the hardening of a gypsum slurry. The gypsum slurry includes water, gypsum powder, and a reinforcing agent. The reinforcing agent includes a polymer component and a silicon compound component. The polymer component includes triacetylcellulose, polyester material, and iodized polyvinyl alcohol. The iodized polyvinyl alcohol is formed from polyvinyl alcohol and an iodine source. The silicon compound component includes at least one of an organosilicon compound and an inorganic silicon compound. [Effects of the Invention]

[0007] The effect of the present invention is that the gypsum product of the present invention has high compressive strength because it is formed from a gypsum slurry containing a reinforcing agent. [Modes for carrying out the invention]

[0008] The gypsum product of the present invention includes a gypsum body. The gypsum body is formed by a gypsum slurry. The gypsum slurry contains water, gypsum powder, and a reinforcing agent. The gypsum powder may be, for example, hemihydrate gypsum powder, and the water content of the hemihydrate gypsum powder is, for example, in the range of 3.5 to 12%, but is not limited thereto.

[0009] More preferably, if the waterproofing effect of the gypsum body is to be improved, a moisture-proofing agent can be added separately to the gypsum slurry. There are no particular limitations on the type of moisture-proofing agent, and any moisture-proofing agent known or commonly used in the field of gypsum products can be used. The specific form of the gypsum product is not limited to, for example, gypsum brick or gypsum board. Here, the addition ratio of the moisture-proofing agent to the reinforcing agent is 1:1 to 1:2.5.

[0010] The reinforcing agent comprises a polymer component and a silicon compound component.

[0011] The polymer component comprises triacetylcellulose, polyester material, and iodized polyvinyl alcohol.

[0012] The term "triacetylcellulose" as used herein refers to a substance that is in a solid state and is a triacetylcellulose material. The term "triacetylcellulose" as used herein includes alkalized triacetylcellulose and non-alkalized triacetylcellulose. Specific forms of the triacetylcellulose include, but are not limited to, fibers, particles, flakes, films, or ribbons.

[0013] The aforementioned polyester material refers to a substance that is in a solid state and consists of a polyester material. The aforementioned polyester material is, for example, a known or common polyester material such as polyethylene terephthalate, but is not limited thereto. In some forms, the polyester material is polyethylene terephthalate pellets.

[0014] The iodized polyvinyl alcohol refers to a substance that is in a solid state and is formed from polyvinyl alcohol and an iodine source. The specific form of the iodized polyvinyl alcohol is, for example, flakes, films, ribbons, fibers, or particles, but is not limited thereto. In some embodiments, the iodized polyvinyl alcohol is iodized polyvinyl alcohol particles. The iodized polyvinyl alcohol can impart antibacterial properties to the gypsum product, and since the iodine source is not directly added during the process of manufacturing the gypsum product in the form of the iodized polyvinyl alcohol, the color of the gypsum product manufactured with the iodized polyvinyl alcohol remains white, and the problem of discoloration due to iodine does not occur.

[0015] In some embodiments, the iodine source is at least one selected from the group consisting of iodine molecules, iodide ions, and iodide salts. The iodide salt is, for example, potassium iodide or sodium iodide. In some embodiments, the iodine source is potassium iodide. In some embodiments, the iodine content in the iodized polyvinyl alcohol is 2 to 15 wt%.

[0016] The method for producing the iodized polyvinyl alcohol is, for example, obtained by contacting polyvinyl alcohol with an aqueous solution containing the iodine source, but is not limited thereto. Here, the specific form of the polyvinyl alcohol is, for example, flakes, films, ribbons, fibers, or particles, but is not limited thereto. The operating conditions for the above steps are, for example, that the temperature range of the iodine aqueous solution is 25 to 70°C and the time during which the polyvinyl alcohol is in contact with the iodine source aqueous solution is 1 to 20 minutes, but is not limited thereto. In addition, if necessary, excess iodine aqueous solution on the iodized polyvinyl alcohol is washed off with water and the washed iodized polyvinyl alcohol is dried.

[0017] The silicon compound component comprises at least one organosilicon compound and an inorganic silicon compound.

[0018] The organosilicon compound is at least one selected from alkoxysilanes and polysiloxanes. The alkoxysilane is, for example, tetraethoxysilane, but is not limited thereto. The polysiloxane is, for example, polydimethylsiloxane, but is not limited thereto. In some embodiments, the organosilicon compound is tetraethoxysilane.

[0019] The inorganic silicon compound is at least one selected from crystalline silicon dioxide, amorphous silicon dioxide, and silicates. In some embodiments, the inorganic silicon compound is crystalline silicon dioxide.

[0020] In some embodiments, the silicon compound component comprises crystalline silicon dioxide and tetraethoxysilane.

[0021] In some embodiments, the size of the reinforcing agent is less than 3 centimeters, which makes it possible to avoid the reinforcing agent being noticeable from the appearance of the manufactured gypsum product.

[0022] Next, the functions of the polymer component and the silicon compound component will be further described. When manufacturing the gypsum product of the present invention using the gypsum slurry, the triacetyl cellulose, the polyester material, and the iodinated polyvinyl alcohol are likely to be uniformly dispersed in the gypsum slurry and provide buffering during the crystallization of the gypsum powder. The hydroxyl groups present on the surface of the polymer component adsorb the organosilicon compound, thereby ensuring that the organosilicon compound is also uniformly dispersed.

[0023] When manufacturing the gypsum product of the present invention using the gypsum slurry, the organosilicon compound gradually undergoes hydrolysis and condensation reactions to produce silicon dioxide. The produced silicon dioxide fills the gaps between the particles, thereby improving the density and compressive strength of the gypsum product. The inorganic silicon compound similarly fills the gaps between the particles, enhancing the density and compressibility of the product.

[0024] In some embodiments, when the total amount of the reinforcing agent is 100 wt%, the range of the usage amount of the triacetyl cellulose is 25 - 70 wt%, the range of the usage amount of the iodinated polyvinyl alcohol is 1 - 20 wt%, and the range of the usage amount of the polyester material is 5 - 50 wt%.

[0025] In some embodiments, the range of the usage amount of the silicon compound is 6 - 14 wt%.

[0026] The silicon compound includes inorganic and organic silicon compounds. The range of the usage amount of the inorganic silicon compound is 5 - 9 wt%, and the range of the usage amount of the organic silicon compound is 1 - 5 wt%.

[0027] The preparation method of the reinforcing agent is as follows. In some embodiments, for example, the triacetyl cellulose, the iodinated polyvinyl alcohol, the polyester material, and the silicon compound are mixed in the gypsum slurry, but it is not limited thereto. The range of the stirring speed is not particularly limited, for example, it is in the range of 10 - 5000 rpm.

[0028] In some embodiments, based on 100 parts by weight of the amount of the gypsum powder used, the amount of the reinforcing agent used is 0.05 to 2 parts by weight. In some embodiments, based on 100 parts by weight of the amount of the gypsum powder used, the amount of the reinforcing agent used is 0.5 parts by weight.

[0029] The method for manufacturing the gypsum product is as follows. For example, the gypsum powder, the water, the moisture-proof agent, and the reinforcing agent are uniformly mixed to form a gypsum slurry. After the gypsum slurry is cured, the moisture is removed to obtain the gypsum product. The conditions for the above-mentioned stirring, curing, and moisture removal are not particularly limited. For example, the rotation speed of the stirring is 3000 rpm, the range of the curing time is 5 to 7 minutes, and the moisture is removed by drying in a well-ventilated shaded area and / or drying in a dryer.

[0030] Hereinafter, the present invention will be described in more detail with reference to production examples and embodiments. However, the above production examples and examples are for illustrative purposes and are not intended to limit the implementation of the present invention.

[0031] [Production Example] Reinforcing Agent

[0032] 0.15 kg of iodine molecules (manufacturer: Union Chemical Reagent, model number: EP grade) and 0.85 kg of potassium iodide (manufacturer: Scharlau, model number: EP grade) are dissolved in 9 kg of water to obtain an iodine source aqueous solution with a total weight of 10 kg and an iodine source concentration of 10 wt%.

[0033] Polyvinyl alcohol particles with a size of 0.4 cm (manufacturer: Changchun Chemical Industry, model number: BP05) are used as polyvinyl alcohol.

[0034] 1 kg of the polyvinyl alcohol is immersed in 10 kg of the iodine aqueous solution at 50 °C for 10 minutes to form an iodinated polyvinyl alcohol carrier. Next, the excess iodine aqueous solution on the iodinated polyvinyl alcohol is washed with water. Finally, the washed iodinated polyvinyl alcohol is air-dried.

[0035] A triacetylcellulose membrane (manufacturer: Tachi Optoelectronics, model number: TAC Optical Membrane) is crushed using a crusher (manufacturer: Shunri Machinery, model number: SH-016) to produce multiple flake-shaped or ribbon-shaped small films. The small films are then sorted using a stainless steel sieve from the crusher, and small films with a length of 0.5 cm are selected and used as triacetylcellulose.

[0036] Polyethylene terephthalate pellets with dimensions of 0.5 cm (manufacturer: Nanya Plastics, model number: 380R) are used as polyethylene terephthalate.

[0037] 4 kg of the aforementioned triacetylcellulose, 4 kg of the aforementioned polyethylene terephthalate, 1 kg of the aforementioned iodized polyvinyl alcohol, 0.8 kg of the aforementioned crystalline silicon dioxide (manufacturer: Shijun Industrial, model number: 9#), and 0.2 kg of tetraethoxysilane (manufacturer: Evonik, model number: Dynasylan registered trademark 40) are mixed and stirred at 25°C and 2000 rpm for 5 minutes to obtain a reinforcing agent.

[0038] [Embodiment] Large plaster brick 2.1 kg of the reinforcing agent from Production Example 1, 357 kg of water, and 1 kg of moisture-proofing agent (Manufacturer: Taiwan Aifuk, Model: Gypsum Moisture-Proofing Agent) were stirred for 20 seconds at 25°C and a rotation speed of 3000 rpm to obtain a mixture. Next, 420 kg of hemihydrate gypsum powder (Manufacturer: Baofuta Industrial, Model: GS5) was added to the mixture and stirred for 20 seconds at 25°C and a rotation speed of 3000 rpm to obtain a gypsum slurry. The gypsum slurry was quickly poured into a hollow mold (the hollow mold was 60 cm long x 40 cm wide x 9 cm high), and after the gypsum slurry in the hollow mold hardened (hardening time was 5-7 minutes), it was removed from the mold to obtain a hardened gypsum body. Next, the hardened gypsum body was dried in a well-ventilated, shaded area for 10 hours to obtain a dried hardened gypsum body. Subsequently, the dried and hardened material was placed in an oven (manufacturer: Baofuta Industrial Co., Ltd.), first dried at 100°C for 2.5 hours, and then dried at 60°C for 48 hours to obtain a dried gypsum hardened material. The dried and hardened gypsum was left in a dry, well-ventilated place for 3 days to obtain large white gypsum bricks.

[0039] [Control group] Large plaster bricks The difference between the control group and the embodiment is that no reinforcing agent was added to the control group.

[0040] The large gypsum bricks from the embodiment and the control group were each cut into 10 cubes with sides of 5 cm. The gypsum brick cubes from each block of the embodiment and the control group were then subjected to the following compressive strength and water absorption tests:

[0041] Compressive strength: Using a compression testing machine (manufacturer: Kim Kyung-hwa Enterprise, model number: HCH-150T-N, piston rod diameter: 5 cm), pressure tests were performed on each cubic gypsum brick in the embodiment and the control group. The pressure value at the moment the cubic gypsum brick burst was defined as the compressive strength of the cubic gypsum brick. The test results are shown in Table 1.

[0042] Water absorption rate: The initial weight W0 of each block of cubic gypsum bricks in the embodiment and the control group was obtained by weighing them. The gypsum bricks in each block were immersed in water 5 cm below the surface for 2 hours, after which the cubic gypsum bricks in each block were removed from the water, and the surface moisture of each cubic gypsum brick was wiped off and dried. Next, the cubic gypsum bricks in each block were weighed to obtain the water-absorbing weight W1 of each cubic gypsum brick. The water absorption rate of each block of cubic gypsum brick was calculated using "(W1-W0) / W0×100%". The measurement results are shown in Table 1.

[0043] [Table 1]

[0044] Referring to the water absorption rates in Table 1, neither the embodiment nor the control group is affected by the moisture barrier. Furthermore, referring to the compressive strength in Table 1, the compressive strength of the embodiment is higher than that of the control group. From the above, it is proven that the gypsum product using the reinforcing agent in the manufacturing example has higher compressive strength.

[0045] The above-mentioned details represent only a part of the embodiments of the present invention and do not limit the scope of implementation. Simple equivalent modifications and alterations based on the claims and specification of the present invention are all included within the technical scope of the present invention.

Claims

1. A gypsum product comprising a gypsum body, the gypsum body being formed by the hardening of a gypsum slurry, the gypsum slurry comprising water, gypsum powder, and a reinforcing agent, the reinforcing agent comprising a polymer component and a silicon compound component, the polymer component comprising triacetylcellulose, polyester material, and iodized polyvinyl alcohol, and the iodized polyvinyl alcohol being formed from polyvinyl alcohol and an iodine source.

2. The gypsum product according to claim 1, wherein the iodine content in the iodized polyvinyl alcohol is 2 to 15 wt%.

3. The gypsum product according to claim 1, wherein the iodine source is at least one selected from the group consisting of iodine molecules, iodide ions, and iodine salts.

4. The gypsum product according to claim 2, wherein the silicon compound component comprises at least one organosilicon compound and an inorganic silicon compound, and the organosilicon compound is at least one selected from the group consisting of alkoxysilanes and polysiloxanes.

5. The gypsum product according to claim 4, wherein the inorganic silicon compound is at least one selected from the group consisting of crystalline silicon dioxide, amorphous silicon dioxide, and silicate.

6. The gypsum product according to claim 4, wherein the alkoxysilane is selected from tetraethoxysilane and the polysiloxane is selected from polydimethylsiloxane.

7. The gypsum product according to claim 1, wherein, when the total amount of the reinforcing agent is 100 wt%, the range of the amount of triacetylcellulose used is 25 to 70 wt%, the range of the amount of iodized polyvinyl alcohol used is 1 to 20 wt%, the range of the amount of polyester material used is 5 to 50 wt%, and the range of the amount of silicon compound component used is 6 to 14 wt%.

8. The gypsum product according to claim 4, wherein, when the total amount of the reinforcing agent is 100 wt%, the silicon compound component includes an inorganic silicon compound and an organosilicon compound, the amount of the inorganic silicon compound used is in the range of 5 to 9 wt%, and the amount of the organosilicon compound used is in the range of 1 to 5 wt%.

9. The gypsum product according to claim 4, wherein the gypsum slurry further contains a moisture-proofing agent, and the addition ratio of the moisture-proofing agent to the reinforcing agent is 1:1 to 1:2.

5.

10. The gypsum product according to claim 1, wherein when the amount of gypsum powder used is 100 parts by weight, the range of the amount of reinforcing agent used is 0.05 to 2 parts by weight.

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