A gypsum plaster and a slurry

Abstract

Provided is a gypsum plaster, comprising a gypsum, a lightweight aggregate and an additive, wherein the lightweight aggregate comprises foam glass particles. Provided is also a gypsum plaster slurry, comprising the gypsum plaster as described above and water, wherein the weight ratio of the gypsum plaster to water is 1:0.3-0.6. According to the technical solutions of the present disclosure, the foam glass waste can be reused to reduce or even eliminate traditional lightweight aggregates, which is energy-saving and environmentally friendly.

Description

[0001] A gypsum plaster and a slurry

[0002] Technical field

[0003] The present disclosure relates to a gypsum building material, and particularly to a gypsum plaster.

[0004] Gypsum plaster, also known as plastering gypsum, is a type of plastering material for interior walls and ceiling surfaces of buildings, formulated with a gypsum binding material as the base material.

[0005] Lightweight aggregate is used in a gypsum plaster to prepare a lightweight gypsum plaster. Commonly used lightweight aggregates comprise granular materials such as an expanded perlite, an expanded vermiculite, a ceramsite or the like. However, such lightweight aggregates require the use of raw materials for calcination, which consumes a significant amount of energy.

[0006] Foam glass is a commonly used thermal insulation material, which is usually prepared as a foam glass pane. Waste materials, such as broken pieces, will be produced in the foam glass, especially in the cutting process.

[0007] An object of the present disclosure is to use a foam glass in a gypsum plaster instead of traditional lightweight aggregates.

[0008] Accordingly, in an aspect of the present disclosure, provided is a gypsum plaster, comprising the following components, on a weight basis, 55-95 parts of a gypsum; 6-40 parts of a lightweight aggregate; 0.5-6 parts of a filler; and 0.01-3 parts of an additive. In an embodiment, the lightweight aggregate comprises foam glass particles. In an embodiment, the foam glass particles have a particle size distribution ranging from 80 to 1000 pm.

[0009] In an embodiment, in the lightweight aggregate, the foam glass particles have a weight fraction of more than 0 and less than or equal to 100%. In an embodiment, the lightweight aggregate further comprises at least one of expanded perlite particles, expanded vermiculite particles or ceramsites. In an embodiment, the lightweight aggregate has a bulk density of less than or equal to 1000 kg / m3. Preferably the lightweight aggregate has a bulk density of less than or equal to 500kg / m3, more preferably the lightweight aggregate has a bulk density of 310 - 350kg / m3.

[0010] In an embodiment, the additive is at least one of a retarder, a water-retaining agent, an air- entraining agent, a plasticizer and a thixotropic agent.

[0011] In another aspect, provided is a gypsum plaster slurry, comprising the gypsum plaster as described above and water, wherein the weight ratio of the gypsum plaster to water is 1 :0.3-0.6.

[0012] According to the technical solutions of the present disclosure, the foam glass waste can be reused to reduce or even eliminate traditional lightweight aggregates, which is energy-saving and environmentally friendly.

[0013] Brief of Drawings

[0014] Fig. l shows finished coating of example 14 of the current application.

[0015] Examples

[0016] Examples of the present disclosure are illustrated as follows

[0017] The term “part by weight” as used herein refers to weight units with the same unit and quantity. For example, 1 part by weight may be a weight unit of 1 g, or 1 kg, or 10 g, or other numerical values. “Weight fraction” refers to the weight ratio of a specific component as compared to a benchmark, expressed as a percentage.

[0018] The gypsum plaster is typically a powdered mixture comprising a gypsum, a lightweight aggregate, a filler, and an additive.

[0019] The gypsum used in the gypsum plaster may be a calcined gypsum, for example a raw material complying with the national standard GB / T 28627-2023 “Gypsum Plaster”. The amount of the gypsum as used is usually 55-95 parts by weight.

[0020] The filler mainly functions as filling and supporting. Generally, the limestone powder may be used as a filler. The filler may usually be present in 0.5-6 parts of weight.

[0021] In the present disclosure, the additive may be those commonly used in gypsum plaster products. These additives may be commercially available. For example, the additive may be at least one of a retarder, a water-retaining agent, an air-entraining agent, a plasticizer and a thixotropic agent and the total part by weight is usually 0.01-3. Specifically, the retarder may be a chemical agent commonly used in the field, such as citric acid, tartaric acid or the like, and the part by weight is usually 0.01-0.5. The water-retaining agent may be cellulose ether, and the part by weight is usually 0.15-0.35. The thixotropic agent may be bentonite, and the part by weight is usually 0.3-1.5. The amount of the air-entraining agent as used is usually 0.01-0.5 parts by weight.

[0022] The lightweight aggregate may be a foam glass, or a combination of a foam glass and at least one of an expanded perlite, an expanded vermiculite and a ceramsite. The lightweight aggregate has a bulk density of less than or equal to 1000 kg / m3. For example, the lightweight aggregate has a bulk density of less than or equal to 500kg / m3, more preferably of 310- 350kg / m3.

[0023] The foam glass particles have a particle size distribution ranging from 80 to 1000 pm.

[0024] The gypsum plaster slurry may be prepared by mixing the gypsum plaster with water. The weight ratio of gypsum plaster to water is usually 1 :0.3-0.6.

[0025] In the examples provided in Table 1, mixtures of expanded perlite and foam glass particle in different ratios were used as lightweight aggregates in Examples 1-10, and expanded perlite was used as lightweight aggregate in the comparative Example. The particle diameter of the foam glass particles was 475 pm. The bulk density of the foam glass particles was 450 kg / m3.

[0026] The gypsum plaster examples in Table 1 were prepared according to the following parts by weight: a total of 65 parts of the stucco and the additive, including 1 part of filler, 0.1 part of retarder, 0.2 part of cellulose ether, 0.5 part of bentonite and 0.05 part of air-entraining agent;

[0027] 40 parts of the lightweight aggregate, wherein the lightweight aggregate was prepared according to the ratios given in each example in Table 1. The lightweight aggregate dosage in Table 1 is given by volume of expanded perlite replaced by foam glass particles.

[0028] The components were mixed to form the gypsum plaster, and then 50 parts of water was added and well mixed to make the slurry.

[0029] The strength of each example was tested according to the method of GB / T 28627-2023 “Gypsum Plaster”. The test results were shown in Table 1.

[0030] Table 1

[0031] From the results in Table 1, it can be seen that as compared to the Comparative Example, the strength of the samples prepared with lightweight aggregates in different proportions was close and satisfied the requirements of the standard. Therefore, the foam glass may be used instead of the traditional lightweight aggregate.

[0032] The examples shown in Table 2 were prepared according to below composition: stucco, foaming glass powder, limestone, retarder, accelerator, cellulose ether, air-entraining agent. The content of the additives are common dosage known in the art. Table 2 shows the composition of each examples in wt.%.

[0033] Table 2

[0034] The bulk density of foaming glass powder is different with that of the examples of Table 1. The bulk density of the foam glass particles for examples 11-15 is 310-350 kg / m3.

[0035] Similarly, the components were mixed to form the gypsum plaster, and then 50 parts of water was added and well mixed to make the slurry.

[0036] The strength of each example was tested according to the method of GB / T 28627-2023 “Gypsum Plaster”. The test results were shown in Table 3. The proportion of foam glass particles in Table 3 is weight proportion of foam glass particles based on total weight of plaster.

[0037] Table 3

[0038] From Table 3, it is clear that it is possible to use foam glass as lightweight aggregate and retain good plaster mechanical properties.

[0039] Fig. 1 shows the finished coating of example 14. The test is coating the slurry prepared according to example 14 onto a wall surface to check the aspect of the dried coating layer. Fig 1. shows that the aspect of example 14 is similar to the one obtained with a standard gypsum plaster containing expanded perlite.

[0040] In the above description, the details of the technical solutions of the present disclosure have been illustrated. However, those skilled in the art will appreciate that the present disclosure is not limited to the specific details listed in the above embodiments but can vary within the scope defined by the claims.

Claims

CLAIMS1. A gypsum plaster, comprising the following components, on a weight basis,55-95 parts of a gypsum;6-40 parts of a lightweight aggregate;0.5-6 parts of a filler; and0.01-3 parts of an additive, wherein the lightweight aggregate comprises foam glass particles.

2. The gypsum plaster according to claim 1, wherein, the foam glass particles have a particle size distribution ranging from 80 to 1000 pm.

3. The gypsum plaster according to claim 1, wherein, in the lightweight aggregate, the foam glass particles have a weight fraction of more than 0 and less than or equal to 100%.

4. The gypsum plaster according to claim 1, wherein, the lightweight aggregate further comprises at least one of expanded perlite particles, expanded vermiculite particles or ceramsites.

5. The gypsum plaster according to claim 1, wherein, the lightweight aggregate has a bulk density of less than or equal to 1000 kg / m3.

6. The gypsum plaster according claim 5, wherein, the light weight aggregate has a bulk density of less than or equal to 500 kg / m3.

7. The gypsum plaster according to claim 6, wherein, the light weight aggregate has a bulk density of 310-350 kg / m3.

8. The gypsum plaster according to claim 1, wherein, the additive is at least one of a retarder, a water-retaining agent, an air-entraining agent, a plasticizer and a thixotropic agent.

9. A gypsum plaster slurry, comprising the gypsum plaster according to any one of claims 1-8 and water, wherein the weight ratio of the gypsum plaster to water is 1 :0.3-0.6.

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