Compound additive for prolonging construction time of anti-crack plastering gypsum and application thereof

Abstract

The invention relates to the technical field of gypsum building materials, in particular to a compound additive for prolonging the construction time of anti-crack plastering gypsum and application thereof.The compound additive is composed of alkyl (C14-C16) sodium olefin sulfonate, 3-hydroxypropane-1-sodium sulfonate and an alkanol 189S surfactant, the mass ratio of the alkyl (C14-C16) sodium olefin sulfonate to the 3-hydroxypropane-1-sodium sulfonate to the alkanol 189S surfactant is (2-4): (3-4): (3-4), the three specific substances are compounded and then added into the anti-crack plastering gypsum, the problem that the construction time of the anti-crack plastering gypsum is seriously shortened due to the use of the alkaline anti-crack agent can be effectively solved, and the construction efficiency is greatly improved. And the mechanical property of the gypsum is not influenced too much.

Description

Technical Field

[0001] The present application relates to the technical field of gypsum building materials, and more specifically, to a compound additive for prolonging the construction time of anti-cracking plaster gypsum and its application. Background Art

[0002] Plastering gypsum is a new type of lightweight wall leveling mortar, mainly used for leveling plastering of indoor walls and ceilings of buildings. Due to its advantages such as convenient construction, small shrinkage after drying, no hollowing, and no cracking in the later stage, it has replaced the traditional cement plastering mortar and is suitable for various walls.

[0003] The main cementing material used in plastering gypsum is semi-hydrated gypsum powder. Over-burned semi-hydrated gypsum powder is not aged and is directly used in the production of plastering gypsum. The finished plastering gypsum made from it may have the risk of plastic cracking after construction. In order to solve the problem of plastic cracking of plastering gypsum, enterprises generally add some alkaline anti-cracking agents during the production process. Alkaline anti-cracking agents solve the problem of plastic cracking of plastering gypsum, but they also bring new problems. For example, after the materials are stirred, the viscosity of the slurry increases rapidly over time, resulting in a serious shortening of the construction time of the plastering gypsum. Summary of the invention

[0004] The present application provides a compound additive for extending the construction time of anti-cracking plaster and its application. After three specific substances are compounded, they are added to the anti-cracking plaster, which can effectively solve the problem of severely shortened construction time of anti-cracking plaster due to the use of alkaline anti-cracking agents, and will not affect the mechanical properties of the plaster too much.

[0005] In the first aspect, the present application provides a compound additive for extending the construction time of anti-cracking plaster, using the following technical solution:

[0006] A composite additive for extending the construction time of anti-cracking plaster. The composite additive consists of sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant. The mass ratio of the sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant is (2-4): (3-4): (3-4).

[0007] Furthermore, the mass ratio of the sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant is (2.5-3.5): (3.3-3.5): (3.3-3.5).

[0008] In a second aspect, the present application provides an application of a compound additive for extending the construction time of anti-cracking plaster, using the following technical solution:

[0009] The invention discloses an application of a compound additive for prolonging the construction time of crack-resistant plaster. The compound additive is used for the crack-resistant plaster.

[0010] Furthermore, the mass dosage ratio of the compound additive to the anti-cracking plaster is (0.05-0.5):1000.

[0011] In summary, this application has the following beneficial effects:

[0012] 1. Among the compound additives of the present application, the main function of sodium alkyl (C14-C16) olefin sulfonate is to improve the stability of bubbles inside the plaster slurry, and the main function of the sodium 3-hydroxypropane-1-sulfonate dosage is to serve as an emulsifier inside the slurry to reduce the surface tension of water, make the entire slurry system more moist and easy to scrape, and increase the usable time; the main function of the alkanol 189S surfactant is to make the emulsifier more stable, improve the dispersibility and thixotropy of the gypsum slurry particles; in addition, the three are compounded in a prescribed ratio, and their comprehensive effect prolongs the construction time of the anti-cracking plaster gypsum. At the same time, it will not affect the mechanical properties of the anti-cracking plaster gypsum, so that the anti-cracking plaster gypsum can be used normally.

[0013] 2. The present application adds compound additives to the anti-cracking plaster in a prescribed proportion. On the one hand, the compound additives can fully play the role of extending the construction time of the anti-cracking plaster. On the other hand, an appropriate amount of compound additives will not cause the plaster strength to be too low. DETAILED DESCRIPTION

[0014] The present application is further described in detail below with reference to the embodiments.

[0015] Example

[0016] In the embodiments of the present application, the anti-cracking plaster used is semi-hydrated gypsum powder, perlite, water retaining agent, retarder, alkaline anti-cracking agent, and the composition is as follows in parts by weight:

[0017]

[0018] The water retaining agent is hydroxypropyl methylcellulose ether with a viscosity of 40000 Pa.s.

[0019] The retarder is an amino acid gypsum retarder.

[0020] The alkaline anti-cracking agent is calcium hydroxide with a particle size of 400 meshes.

[0021] The following is an explanation through specific embodiments.

[0022] Example 1

[0023] This embodiment provides a compound additive for extending the construction time of anti-cracking plaster, which is a mixture of sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant in a mass ratio of 3:3.5:3.5.

[0024] Furthermore, an embodiment of the present application provides an anti-cracking plaster using the above-mentioned compound additive. Specifically, 0.2 kg / ton of the compound additive is added to the anti-cracking plaster and mixed evenly.

[0025] Example 2

[0026] This embodiment provides a composite additive for extending the construction time of anti-cracking plaster, which is a mixture of sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant in a mass ratio of 3:3:3.

[0027] Furthermore, an embodiment of the present application provides an anti-cracking plaster using the above-mentioned compound additive. Specifically, 0.2 kg / ton of the compound additive is added to the anti-cracking plaster and mixed evenly.

[0028] Example 3

[0029] This embodiment provides a composite additive for extending the construction time of anti-cracking plaster, which is a mixture of sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant in a mass ratio of 2.5:3.3:3.3.

[0030] Furthermore, an embodiment of the present application provides an anti-cracking plaster using the above-mentioned compound additive. Specifically, 0.2 kg / ton of the compound additive is added to the anti-cracking plaster and mixed evenly.

[0031] Example 4

[0032] This embodiment provides a composite additive for extending the construction time of anti-cracking plaster, which is a mixture of sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant in a mass ratio of 2:4:4.

[0033] Furthermore, an embodiment of the present application provides an anti-cracking plaster using the above-mentioned compound additive. Specifically, 0.2 kg / ton of the compound additive is added to the anti-cracking plaster and mixed evenly.

[0034] Example 5

[0035] This embodiment provides a composite additive for extending the construction time of anti-cracking plaster, which is a mixture of sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant in a mass ratio of 4:3.5:3.5.

[0036] Furthermore, an embodiment of the present application provides an anti-cracking plaster using the above-mentioned compound additive. Specifically, 0.2 kg / ton of the compound additive is added to the anti-cracking plaster and mixed evenly.

[0037] Example 6

[0038] The difference between Example 6 and Example 2 is that 0.05 kg / ton of the compound additive is added to the anti-cracking plaster and mixed evenly.

[0039] Example 7

[0040] The difference between Example 7 and Example 2 is that 0.5 kg / ton of the compound additive is added to the anti-cracking plaster and mixed evenly.

[0041] Comparative Example

[0042] The difference between Comparative Example 1 and Example 2 is that a compound additive for extending the construction time of anti-cracking plaster is prepared by mixing sodium alkyl (C14-C16) olefin sulfonate and sodium 3-hydroxypropane-1-sulfonate in a mass ratio of 3:3.

[0043] The difference between Comparative Example 2 and Example 6 is that a compound additive for extending the construction time of crack-resistant plaster is prepared by mixing sodium alkyl (C14-C16) olefin sulfonate and sodium 3-hydroxypropane-1-sulfonate in a mass ratio of 3:3.

[0044] The difference between Comparative Example 3 and Example 7 is that a compound additive for extending the construction time of anti-cracking plaster is prepared by mixing sodium alkyl (C14-C16) olefin sulfonate and sodium 3-hydroxypropane-1-sulfonate in a mass ratio of 3:3.

[0045] The difference between Comparative Example 4 and Example 2 is that a compound additive for extending the construction time of the anti-cracking plaster is an alkanol 189S surfactant.

[0046] The difference between Comparative Example 5 and Example 6 is that a compound additive for extending the construction time of the anti-cracking plaster is an alkanol 189S surfactant.

[0047] The difference between Comparative Example 6 and Example 7 is that a compound additive for extending the construction time of the anti-cracking plaster is an alkanol 189S surfactant.

[0048] The difference between Comparative Example 7 and Example 2 is that 0.55 kg / ton of the compound additive is added to the anti-cracking plaster and mixed evenly.

[0049] The difference between Comparative Example 8 and Example 2 is that a compound additive for extending the construction time of anti-cracking plaster is prepared by mixing sodium alkyl (C14-C16) olefin sulfonate and alkanol 189S surfactant in a mass ratio of 3:3.

[0050] The difference between Comparative Example 9 and Example 2 is that a compound additive for extending the construction time of anti-cracking plaster is prepared by mixing sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant in a mass ratio of 3:3.

[0051] Performance Testing

[0052] The anti-cracking plaster gypsum mortar in each embodiment and comparative example is mixed evenly with the compound additive respectively, and the standard water consumption for mixing is determined as powder: water = 1:0.7 (mass ratio) according to the standard diffusion degree in GB / T 28627-2023, and 30 kg of anti-cracking plaster gypsum mortar powder mixed evenly with the compound additive is weighed, and the corresponding required water is weighed according to the standard water consumption. The weighed water is first added to the stirrer, and then the weighed anti-cracking plaster gypsum mortar powder of the brand is poured into the stirrer, and stirred evenly with the stirrer (stirring time 1 to 1.5 minutes), specifically 1.5 minutes.

[0053] The stirred slurry is taken out from the mixer every 5 minutes and applied to the wall with a scraper. Stop when the first scrape shows fuzz, curling, or many pores and is not smooth. At this time, the slurry cannot be used. Record the time when the slurry was last scraped on the wall and became smooth and delicate, and subtract the time when the bucket of anti-cracking plaster gypsum mortar was just mixed, which is the usable time of the bucket of material.

[0054] The stirred slurry is loaded into a 40*40*160mm triple mold and cured to test its compressive strength according to the compressive strength test method in GB / T 28627-2023.

[0055] The test results of the embodiments and comparative examples are shown in Table 1. The control group is a plastering gypsum without adding compound additives.

[0056] Table 1 Performance test results of embodiments and comparative examples

[0057]

[0058]

[0059] By comparing the performance test results of Examples 1 to 7 and the control group, it can be seen that under the condition of similar final setting time, the anti-cracking plastering gypsum mixed with a composite additive provided by the present application for extending the construction time of the anti-cracking plastering gypsum can significantly extend the usable time of the product. In Example 1, the usable time of the anti-cracking plastering construction is extended by 40 minutes compared with the usable time of the control group, which significantly improves the construction performance of the anti-cracking plastering gypsum. Moreover, the compressive strength of the gypsum in the examples does not decrease too much.

[0060] By comparing the performance test results of Example 2, Example 6 and Example 7, it can be seen that the dosage of the compound additive provided by the present application for extending the construction time of anti-cracking plaster gypsum in the anti-cracking plaster gypsum has a significant effect on the usable time. When the compound additive is 0.05 kg / ton in Example 6, the usable time can be extended by 10 min compared with the control group. When the dosage of the compound additive is too low, the effect of extending the usable time is weak; when the compound additive is 0.5 kg / ton in Example 7, the usable time can be extended by 20 min compared with the control group, which is also lower than the effect of extending the usable time in Example 2. The main reason is that when the dosage of the compound additive is too high, the anti-cracking plaster gypsum slurry system is unstable. It can be seen from the experimental test process that in the later stage, as the water molecules are gradually consumed by the hydration of the gypsum phase, there is obvious bubble breaking inside the slurry, resulting in the effect of extending the usable time when the compound additive is added in a high dosage being weaker than that in Example 2.

[0061] By comparing the performance test results of Example 2 with Comparative Example 1, Comparative Example 4, Comparative Example 8, Comparative Example 9, and Example 6 with Comparative Example 2, Comparative Example 5, and Example 7 with Comparative Example 3, Comparative Example 6, it can be seen that the combination of sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant in the composite additive can significantly extend the usable time of the crack-resistant plaster than the combination of the two components or the use of a single component alone.

[0062] By comparing the performance test results of Example 2 with those of Comparative Example 7, it can be seen that when the dosage of the compound additive in the anti-cracking plaster is too high, not only the effect of extending the usable time becomes weaker, but also the strength of the anti-cracking plaster is lower than the minimum compressive strength requirement of 2.5 MPa in GB / T 28627-2023, resulting in unqualified strength performance of the anti-cracking plaster.

[0063] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A compound additive for extending the construction time of anti-cracking plaster, characterized in that: The compound additive consists of sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant, and the mass ratio of the sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant is (2-4): (3-4): (3-4).

2. A composite additive for prolonging the construction time of anti-cracking plaster according to claim 1, characterized in that: The mass ratio of the sodium alkyl (C14-C16) olefin sulfonate, sodium 3-hydroxypropane-1-sulfonate and alkanol 189S surfactant is (2.5-3.5): (3.3-3.5): (3.3-3.5).

3. An application of the compound additive for prolonging the construction time of anti-cracking plaster according to claims 1 to 2, characterized in that: The compound additive is used for anti-cracking plaster.

4. The use of the compound additive for prolonging the construction time of anti-cracking plaster according to claim 3, characterized in that: The mass usage ratio of the compound additive to the anti-cracking plaster is (0.05-0.5):1000.

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