Low water demand gypsum building block and preparation method thereof

Abstract

The present application provides a low-water-demand gypsum block, characterized in that the gypsum block comprises, by weight, 100 parts of gypsum clinker and 30 to 50 parts of water, dihydrate gypsum, 0.1 to 1.5 parts of glass fiber, 0.01 to 0.05 parts of an air-entraining agent, and 0.05 to 0.15 parts of a retarder. The gypsum block provided by the application has excellent strength and water resistance, consumes little water during preparation, and does not require drying after forming; it can be dried naturally in air, thus saving energy and reducing consumption.

Description

Technical Field

[0001] The present invention relates to, but is not limited to, the field of building materials technology, and in particular to, but is not limited to, a gypsum block that requires little mixing water during production. Background Art

[0002] Gypsum blocks are a new lightweight wall material that has been gradually developed in my country. They offer simple construction, lightweight construction, and excellent thermal and sound insulation. They offer irreplaceable advantages in terms of ease of construction, short construction times, and excellent wall smoothness.

[0003] The main raw material of gypsum blocks is gypsum. The theoretical water requirement for gypsum is 18.6%. However, to ensure the slurry maintains a certain fluidity, water must be added during the mixing process, far exceeding the theoretical water requirement—typically 60% to 80%. After the gypsum slurry hardens, excess water escapes from the hardened gypsum, creating numerous voids and capillaries, which degrades the strength and water resistance of the hardened gypsum product. Summary of the Invention

[0004] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0005] The present application proposes a method for producing gypsum blocks with low water demand, which significantly reduces the water-to-cement ratio of gypsum blocks, ensures that the gypsum blocks are formed at a low water-to-cement ratio, and that the strength and water resistance of the gypsum blocks meet the requirements.

[0006] The present application provides a low-water-demand gypsum building block, which comprises, by weight:

[0007] Dihydrate gypsum formed by hydrating 100 parts of gypsum clinker and 30 to 50 parts of water, 0.1 to 1.5 parts of glass fiber, 0.01 to 0.05 parts of air entraining agent and 0.05 to 0.15 parts of retarder.

[0008] In one embodiment provided in the present application, the gypsum clinker is selected from any one or more of desulfurized gypsum clinker, natural gypsum clinker, phosphogypsum clinker and titanium gypsum clinker.

[0009] In one embodiment provided in the present application, the gypsum clinker is a mixture of gypsum powder and gypsum particles, and the gypsum powder accounts for 30 wt.% to 40 wt.% of the gypsum clinker;

[0010] The specific surface area of ​​the gypsum powder is 100m 2 / kg to 200m 2 / kg, the particle size of the gypsum powder is 20μm to 150μm; and the specific surface area is the Blaine specific surface area.

[0011] In one embodiment provided in the present application, the gypsum particles are flaky particles with a diameter of 2 mm to 5 mm and a thickness of 1 mm to 2 mm.

[0012] In one embodiment provided in the present application, the gypsum particles are formed by compressing gypsum powder using a tablet press.

[0013] In one embodiment provided in this application, the density of the gypsum particles is 1.4 g / cm 3 Up to 1.6g / cm 3 .

[0014] In one embodiment provided in the present application, the glass fiber has a diameter of 10 μm to 20 μm and a length of 6 mm to 10 mm.

[0015] In one embodiment provided in the present application, the air entraining agent is selected from any one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate and sodium fatty alcohol polyoxyethylene ether sulfate.

[0016] In one embodiment provided in the present application, the retarder is selected from any one or more of sodium citrate, tartaric acid, potassium tartrate, acrylic acid, sodium hexametaphosphate and sodium polyphosphate.

[0017] On the other hand, the present application provides a method for preparing the above-mentioned gypsum blocks, the preparation method comprising the following steps:

[0018] (1) mixing the gypsum powder, the glass fiber, the retarder and the water to obtain a first slurry;

[0019] (2) mixing the gypsum particles, the air entraining agent, and the first slurry and stirring them while performing ultrasonic treatment to obtain a second slurry;

[0020] (3) Pour the second slurry into the mold to form gypsum blocks.

[0021] In one embodiment provided in the present application, the duration of the ultrasound is 20s to 60s; the frequency of the ultrasound is 25kHz to 60kHz.

[0022] In one embodiment provided in the present application, the second slurry is poured into a mold, and after forming and demoulding, it is placed in a natural drying place to dry in the sun to obtain gypsum blocks.

[0023] The desulfurized gypsum, phosphogypsum and titanium gypsum clinker used in this application are economical and environmentally friendly as raw materials, reducing the pollution of solid waste to the environment.

[0024] The gypsum blocks provided by the present application can reduce the overall gypsum water-to-cement ratio, reduce gypsum porosity, and improve the strength and water resistance of the gypsum blocks. The gypsum blocks provided by the present application use little water and do not require drying after forming. They can be dried naturally in the air, thus saving energy and reducing consumption.

[0025] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. Other advantages of the present application can be invented and obtained through the solutions described in the description. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions and advantages of this application more clear, the embodiments of this application are described in detail below. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other in any way.

[0027] Example 1

[0028] This embodiment provides a low-water-demand gypsum block, which is composed of 100 parts by weight of desulfurized gypsum clinker and dihydrate gypsum formed by hydration of 35 parts by weight of water, 0.1 parts by weight of chopped glass fiber, 0.01 parts by weight of air entraining agent, and 0.05 parts by weight of retarder.

[0029] The low water demand gypsum blocks of this embodiment are prepared by the following method:

[0030] (1) 30 parts by weight of gypsum powder (the specific surface area of ​​gypsum powder is 155m 2 / kg, the particle size of the gypsum powder is 40 μm to 120 μm), chopped glass fibers (diameter is 13 μm, length is 6 mm), and a retarder (sodium citrate) are mixed and stirred uniformly with the water to obtain a first slurry;

[0031] (2) 70 parts by weight of gypsum particles (diameter 3 mm, thickness 1 mm, density 1.5 g / cm 3 ), the first slurry of air entraining agent (sodium lauryl sulfate) is introduced into the mixer, ultrasonicated for 30 seconds at an ultrasonic frequency of 45 kHz to obtain the second slurry;

[0032] (3) Pour the second slurry into a block forming machine, and place it in a natural drying place to dry in the sun after forming and demoulding to obtain gypsum blocks.

[0033] Example 2

[0034] This embodiment provides a low-water-demand gypsum block, which is composed of 100 parts by weight of phosphogypsum clinker and dihydrate gypsum formed by hydration of 45 parts by weight of water, 1 part by weight of chopped glass fiber (diameter 13 μm, length 6 mm), 0.03 parts by weight of an air-entraining agent (sodium dodecylbenzenesulfonate), and 0.1 parts by weight of a retarder (tartaric acid).

[0035] The preparation method of the low water demand gypsum blocks in this embodiment is the same as that in Example 1. However, the weight of the gypsum powder is 40 parts by weight (the specific surface area of ​​the gypsum powder is 155m 2 / kg, the particle size of the gypsum powder is 40μm to 120μm, the weight of the gypsum particles is 60 parts by weight (diameter 4mm, thickness 1.5mm, density 1.6g / cm 3 ).

[0036] Comparative Example 1

[0037] The only difference between this comparative example and Example 1 is that no gypsum particles are added to the gypsum blocks, the gypsum clinker is all gypsum powder, and the gypsum powder, other components and preparation method are the same as those in Example 1.

[0038] Comparative Example 2

[0039] The only difference between this comparative example and Example 1 is that no gypsum powder is added to the gypsum blocks, the gypsum clinker is all gypsum particles, and the gypsum particles, other components and preparation method are the same as those in Example 1.

[0040] Comparative Example 3

[0041] The only difference between this comparative example and Example 1 is that no retarder is added to the gypsum blocks, and the remaining components and preparation method are the same as those in Example 1.

[0042] Comparative Example 4

[0043] The only difference between this comparative example and Example 1 is that the gypsum blocks are not subjected to ultrasonic treatment, and the remaining components and preparation method are the same as those in Example 1.

[0044] Comparative Example 5

[0045] The only difference between this comparative example and Example 1 is that the gypsum particles in the gypsum blocks have a diameter of 8 mm, a thickness of 4 mm, and a particle density of 2.0 g / cm 3 The remaining components and preparation method are the same as those in Example 1.

[0046] Performance Testing

[0047] The mechanical properties of the gypsum blocks prepared in Examples 1 to 2 and Comparative Examples 1 to 5 were tested according to the JC / T698-2010 "Gypsum Block" standard. The test results are shown in Table 1 below.

[0048] Table 1 Implementation effect (solid)

[0049]

[0050] The test results show that the strength and softening coefficient performance indicators of the low water demand gypsum blocks provided in this application are significantly better than the technical requirements of the solid gypsum block breaking load ≥2000N and softening coefficient ≥0.6 in the JC / T698-2010 "Gypsum Block" standard.

Claims

1. A low water demand gypsum block, characterized in that: The gypsum building blocks include, by weight: dihydrate gypsum formed by hydrating 100 parts of gypsum clinker and 30 to 50 parts of water, 0.1 to 1.5 parts of glass fiber, 0.01 to 0.05 parts of air entraining agent and 0.05 to 0.15 parts of retarder; The gypsum clinker is a mixture of gypsum powder and gypsum particles; The gypsum particles are flaky particles with a diameter of 2 mm to 5 mm and a thickness of 1 mm to 2 mm; The density of the gypsum particles is 1.4 g / cm 3 Up to 1.6g / cm 3 ; The preparation method of the gypsum building block comprises the following steps: (1) mixing the gypsum powder, the glass fiber, the retarder and the water to obtain a first slurry; (2) mixing the gypsum particles, the air entraining agent, and the first slurry and performing ultrasonic treatment to obtain a second slurry; (3) Pour the second slurry into the mold to form gypsum blocks.

2. The gypsum block according to claim 1, characterized in that The gypsum clinker is selected from any one or more of desulfurized gypsum clinker, natural gypsum clinker, phosphogypsum clinker and titanium gypsum clinker.

3. The gypsum block according to claim 1, characterized in that The gypsum powder accounts for 30wt.% to 40wt.% of the gypsum clinker; the specific surface area of ​​the gypsum powder is 100m 2 / kg to 200m 2 / kg, the particle size of the gypsum powder is 20μm to 150μm; The specific surface area is the Blaine specific surface area.

4. The gypsum block according to any one of claims 1 to 3, characterized in that The glass fiber has a diameter of 10 μm to 20 μm and a length of 6 mm to 10 mm.

5. The gypsum block according to any one of claims 1 to 3, characterized in that The air entraining agent is selected from any one or more of sodium lauryl sulfate, sodium dodecylbenzene sulfonate and sodium fatty alcohol polyoxyethylene ether sulfate.

6. The gypsum block according to any one of claims 1 to 3, characterized in that The retarder is selected from any one or more of sodium citrate, tartaric acid, potassium tartrate, acrylic acid, sodium hexametaphosphate and sodium polyphosphate.

7. The method for preparing a gypsum block according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: (1) mixing the gypsum powder, the glass fiber, the retarder and the water to obtain a first slurry; (2) mixing the gypsum particles, the air entraining agent, and the first slurry and performing ultrasonic treatment to obtain a second slurry; (3) Pour the second slurry into the mold to form gypsum blocks.

8. The preparation method according to claim 7, characterized in that The duration of the ultrasound is 20s to 60s; the frequency of the ultrasound is 25kHz to 60kHz.

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