阅读说明：本技术 脱硫石膏组合物及制备方法、石膏基内墙腻子及应用 (Desulfurized gypsum composition, preparation method thereof, gypsum-based interior wall putty and application ) 是由 卢玉杰 张瑜瑜 李金钟 于 2021-08-25 设计创作，主要内容包括：本发明提供了一种脱硫石膏组合物及制备方法、石膏基内墙腻子及应用,涉及建筑涂料技术领域,所述脱硫石膏组合物包括按质量分数计的如下组分：半水相脱硫石膏90％-95％,无水相脱硫石膏0.5％-3％,二水相脱硫石膏0.5％-2％,余量为杂质。本发明提供的脱硫石膏组合物通过特定质量配比的半水相脱硫石膏、无水相脱硫石膏和二水相脱硫石膏相互协同,有效改善了传统石膏材料吸水性强,易受潮变形,导致石膏基内墙腻子无法在湿度高环境下使用的技术问题,其在遇水时,也能够有效抑制吸水性,降低溶解度,提高耐水抗潮性,从而有效扩大石膏材料的应用范围。(The invention provides a desulfurized gypsum composition, a preparation method thereof, gypsum-based interior wall putty and application thereof, and relates to the technical field of building coatings, wherein the desulfurized gypsum composition comprises the following components in parts by mass: 90 to 95 percent of semi-water phase desulfurized gypsum, 0.5 to 3 percent of anhydrous phase desulfurized gypsum, 0.5 to 2 percent of two-water phase desulfurized gypsum and the balance of impurities. According to the desulfurization gypsum composition provided by the invention, the semi-aqueous phase desulfurization gypsum, the anhydrous phase desulfurization gypsum and the two-aqueous phase desulfurization gypsum in specific mass ratio are cooperated with each other, so that the technical problem that the gypsum-based interior wall putty cannot be used in a high-humidity environment due to the fact that the traditional gypsum material is strong in water absorption and is easy to damp and deform is effectively solved, and when the traditional gypsum material meets water, the water absorption can be effectively inhibited, the solubility is reduced, the water resistance and the moisture resistance are improved, so that the application range of the gypsum material is effectively expanded.)

1. The desulfurization gypsum composition is characterized by comprising the following components in parts by mass: 90 to 95 percent of semi-water phase desulfurized gypsum, 0.5 to 3 percent of anhydrous phase desulfurized gypsum, 0.5 to 2 percent of two-water phase desulfurized gypsum and the balance of impurities.

2. The method of preparing a desulfurized gypsum composition according to claim 1 comprising the steps of:

calcining the desulfurized gypsum powder at 160-180 ℃ for 90-120min, and then aging the desulfurized gypsum powder in a closed space with the humidity of 20-50% for 13-15 days to obtain the desulfurized gypsum composition.

3. The method for preparing the desulfurization gypsum composition according to claim 2, wherein the calcination time of the desulfurization gypsum powder at 160-180 ℃ is 90-110min, preferably 100 min;

preferably, the aging time is 13.5 to 14.5 days, preferably 14 days.

4. The gypsum-based interior wall putty is characterized by comprising the following components in parts by mass: the desulfurization gypsum composition of claim 1, wherein the desulfurization gypsum composition comprises 40-60 parts of cement, 20-30 parts of cement, 5-10 parts of quartz sand, 1.5-3 parts of composite rubber powder and 2-8 parts of expanded and vitrified micro-beads.

5. The gypsum-based interior wall putty according to claim 4, further comprising fillers and auxiliaries;

preferably, the filler comprises heavy calcium carbonate;

preferably, the filler is used in an amount of 5 to 20 parts by mass.

6. The gypsum-based interior wall putty as set forth in claim 5 wherein said auxiliary comprises at least one of a water retention agent, a water reducing agent, a smoothing agent, a retarder or a water repellent;

preferably, the water-retaining agent is 0.2-0.4 part, the water reducing agent is 0.2-0.5 part, the smoothing agent is 0.1-0.3 part, the retarder is 0.01-0.03 part, and the water repellent is 0.1-0.3 part by mass.

7. The gypsum-based interior wall putty according to claim 6 wherein the set retarder includes citric acid, borax, and tartaric acid;

preferably, the mass ratio of the citric acid to the borax to the tartaric acid is (0.08-0.1): 1: (0.008-0.012), preferably 0.09:1: 0.01.

8. The gypsum-based interior wall putty according to any one of claims 4-7, characterized in that the composite glue powder comprises styrene-acrylic glue powder and EVA glue powder;

preferably, the mass ratio of the styrene-acrylic rubber powder to the EVA rubber powder is 1: (1-3), preferably 1:2.

9. the gypsum-based interior wall putty as set forth in any one of claims 4-7, characterized in that the volume of said expanded and vitrified small balls is 100-120kg/m³；

Preferably, the particle size of the quartz sand is 120-220 meshes;

preferably, the cement is portland cement, preferably 42.5 portland cement.

10. Use of the desulfurized gypsum composition of claim 1 or the gypsum-based interior wall putty according to any one of claims 4 to 9 in buildings.

Technical Field

The invention relates to the technical field of building coatings, in particular to a desulfurized gypsum composition, a preparation method thereof, gypsum-based interior wall putty and application thereof.

Background

The putty for the inner wall in the current market is mainly divided into two categories of gypsum base and non-gypsum base. Due to the characteristics of gypsum, the hardened body of the semi-hydrated gypsum is of a porous structure, and a porous network consisting of more pores exists inside the hardened body, so that the internal surface area is larger due to the micro-expansion of the gypsum, when the gypsum meets water, water can flow into the gypsum through capillary pores, and a large number of hydrophilic groups exist on the surface of the gypsum, so that the solubility of the gypsum is larger, and further the product is dissolved to cause the loss or reduction of the strength of the product.

The non-gypsum-based putty is usually prepared by selecting Portland cement or ash calcium powder as a base material, but due to the micro-shrinkage characteristic of the base material, the risk of shrinkage cracking is easy to occur, and meanwhile, due to the high alkalinity of the ash calcium powder, the risk of wall surface efflorescence and hollowing and shedding is easy to occur.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a desulfurized gypsum composition to solve the technical problem that the gypsum-based interior wall putty cannot be used in a high-humidity environment due to the fact that the traditional gypsum material is high in water absorption and easy to damp and deform.

The invention provides a desulfurized gypsum composition, which comprises the following components in parts by mass: 90-95% of semi-aqueous phase desulfurized gypsum, 0.5-3% of anhydrous phase desulfurized gypsum, 0.5-2% of two-aqueous phase desulfurized gypsum and the balance of impurities.

The invention also aims to provide a preparation method of the desulfurized gypsum composition, which comprises the following steps:

calcining the desulfurized gypsum powder at 160-180 ℃ for 90-120min, and then aging the desulfurized gypsum powder in a closed space with the humidity of 20-50% for 13-15 days to obtain the desulfurized gypsum composition.

Further, the calcination time of the desulfurized gypsum powder at 160-180 ℃ is 90-110min, preferably 100 min;

preferably, the aging time is 13.5 to 14.5 days, preferably 14 days.

The invention also aims to provide gypsum-based interior wall putty which comprises the following components in parts by weight: 40-60 parts of desulfurized gypsum composition, 20-30 parts of cement, 5-10 parts of quartz sand, 1.5-3 parts of composite rubber powder and 2-8 parts of expanded and vitrified micro-beads.

Furthermore, the gypsum-based interior wall putty also comprises a filler and an auxiliary agent;

preferably, the filler comprises heavy calcium carbonate;

preferably, the filler is used in an amount of 5 to 20 parts by mass.

Further, the auxiliary agent comprises at least one of a water-retaining agent, a water reducing agent, a smoothing agent, a retarder or a water repellent;

preferably, the water-retaining agent is 0.2-0.4 part, the water reducing agent is 0.2-0.5 part, the smoothing agent is 0.1-0.3 part, the retarder is 0.01-0.03 part, and the water repellent is 0.1-0.3 part by mass.

Preferably, the set retarder comprises citric acid, borax and tartaric acid;

preferably, the mass ratio of the citric acid to the borax to the tartaric acid is (0.08-0.1): 1: (0.008-0.012), preferably 0.09:1: 0.01.

Further, the compound rubber powder comprises styrene-acrylic rubber powder and EVA rubber powder;

preferably, the mass ratio of the styrene-acrylic rubber powder to the EVA rubber powder is 1: (1-3), preferably 1:2.

further, the capacity of the expanded and vitrified micro-bead is 100-120kg/m³；

Preferably, the particle size of the quartz sand is 120-220 meshes;

preferably, the cement is portland cement, preferably 42.5 portland cement.

The invention also aims to provide the application of the desulfurized gypsum composition or the gypsum-based interior wall putty in buildings.

The invention has at least the following beneficial effects:

according to the desulfurization gypsum composition provided by the invention, the semi-aqueous phase desulfurization gypsum, the anhydrous phase desulfurization gypsum and the two-aqueous phase desulfurization gypsum in a specific mass ratio are cooperated with each other, so that the water absorption can be effectively inhibited, the water resistance and the moisture resistance are improved, and the application range of the gypsum material is effectively expanded.

The preparation method of the desulfurization gypsum composition provided by the invention is simple in process and convenient to operate, and can be suitable for large-scale production and improve the production efficiency.

The desulfurized gypsum composition is adopted to replace the traditional gypsum as a raw material and is cooperated with the cement, the quartz sand, the composite rubber powder and the expanded and vitrified micro balls, so that the gypsum-based interior wall putty has good water resistance and moisture resistance, can be used in a high-humidity environment, has stable retarding time, can prevent cracking, and also has excellent workability and fluidity and stable thermal and mechanical properties.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The commercially available gypsum material has the advantages of strong air permeability, fire resistance, easily available raw materials, strong plasticity, low manufacturing cost and the like, and simultaneously has the defects of strong water absorption and easy moisture denaturation, so that the gypsum-based putty prepared from the traditional gypsum material is not water-resistant and cannot be used in the environment with high humidity, and the application field of the gypsum-based putty is greatly limited.

In view of the above, according to a first aspect of the present invention, there is provided a desulfurized gypsum composition comprising the following components in parts by mass: 90-95% of semi-aqueous phase desulfurized gypsum, 0.5-3% of anhydrous phase desulfurized gypsum, 0.5-2% of two-aqueous phase desulfurized gypsum and the balance of impurities.

Typically, but not by way of limitation, in the desulfurized gypsum composition provided by the invention, the amount of semi-aqueous desulfurized gypsum is, for example, 90%, 91%, 92%, 93%, 94%, or 95% by mass; the mass of the anhydrous phase desulfurized gypsum is, for example, 0.5%, 0.8%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, or 3%; the mass ratio of the two-water phase desulfurized gypsum is 0.5%, 0.8%, 1%, 1.2%, 1.5%, 1.8% or 2%.

According to the desulfurization gypsum composition provided by the invention, semi-aqueous phase desulfurization gypsum, anhydrous phase desulfurization gypsum and two-aqueous phase desulfurization gypsum in a specific mass ratio are cooperated with each other, so that even when the composition meets water, the water absorption can be effectively inhibited, the solubility is reduced, the water resistance and the moisture resistance are improved, and the application range of gypsum materials is effectively expanded.

According to a second aspect of the present invention, there is provided a process for the preparation of a desulfurized gypsum composition, comprising the steps of:

calcining the desulfurized gypsum powder at 160-180 ℃ for 90-120min, and then aging the desulfurized gypsum powder in a closed space with the humidity of 20-50% for 13-15 days to obtain the desulfurized gypsum composition.

In the present invention, the desulfurized gypsum powder refers to conventional desulfurized gypsum powder, and is not particularly limited and commercially available.

Typically, but not by way of limitation, the calcination temperature is, e.g., 160, 165, 170, 175, or 180 ℃ and the calcination time is, e.g., 90, 95, 100, 105, 110, 115, or 120 min; the humidity of aging is, for example, 20%, 25%, 30%, 35%, 40%, 45% or 50%; the aging period is, for example, 13, 13.5, 14, 14.5 or 15 days.

According to the preparation method of the desulfurization gypsum composition, firstly, the moisture in the desulfurization gypsum powder is completely removed through calcination, and then the desulfurization gypsum powder is aged in a closed space with the humidity of 20-50%, so that the desulfurization gypsum powder and the moisture in the air are combined to form the desulfurization gypsum with different phases which exist stably, the stability of the desulfurization gypsum composition is improved, the hydrophilicity and the absorptivity of the desulfurization gypsum composition are inhibited, the water resistance and the moisture resistance are improved, and the application range of the desulfurization gypsum composition in a high-humidity environment is favorably expanded.

In addition, the preparation method of the desulfurization gypsum composition provided by the invention is simple in process and convenient to operate, and can be suitable for large-scale production and improve the production efficiency.

In a preferred embodiment of the invention, when the desulfurized gypsum composition is prepared, the desulfurized gypsum composition prepared has better stability and excellent water and moisture resistance when the desulfurized gypsum powder is calcined at 160-180 ℃ for 90-110min, and especially when the calcination time is 100min, the prepared desulfurized gypsum composition can inhibit the water absorption and has more excellent water and moisture resistance.

Preferably, when the desulfurization gypsum composition is prepared, after the desulfurization gypsum powder is calcined, a plurality of batches of calcined desulfurization gypsum powder are uniformly mixed through air separation and aging, so that batch difference is avoided, the stability of the desulfurization gypsum powder is improved, and then the desulfurization gypsum powder is aged in a closed space with the humidity of 20-50%.

Preferably, the winnowing ageing is carried out by means of a high-speed fan at a speed of 8-12m/s, more preferably at a speed of 10 m/s.

According to a third aspect of the invention, the invention provides gypsum-based interior wall putty, which comprises the following components in parts by weight: 40-60 parts of desulfurized gypsum composition, 20-30 parts of cement, 5-10 parts of quartz sand, 1.5-3 parts of composite rubber powder and 2-8 parts of expanded and vitrified micro-beads.

Typically, but not by way of limitation, in the gypsum-based interior wall putty provided by the present invention, the desulfurized gypsum composition is present in an amount of, for example, 40, 42, 45, 48, 50, 52, 55, 58, or 60 parts by weight; the mass portion of the cement is 20, 22, 25, 28 or 30; the mass fraction of the quartz sand is 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10 parts; the mass portion of the expanded and vitrified micro bubbles is 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5 or 8.

The desulfurized gypsum composition is adopted to replace the traditional gypsum as a raw material, and is mutually cooperated with the cement, the quartz sand and the composite rubber powder, so that the gypsum-based interior wall putty has good water resistance and moisture resistance, can be used in a high-humidity environment, has stable retarding time, can prevent cracking, and also has excellent workability and fluidity and stable thermal and mechanical properties.

In addition, the gypsum-based interior wall putty provided by the invention has a good one-time filling and leveling effect, can reduce the risk of wall surface efflorescence and hollowing, and has a wide application prospect.

[ expanded and vitrified small beads ]

The invention adopts the expanded and vitrified micro-beads to replace the traditional common expanded perlite and polyphenyl granules as the aggregate of the dry mixed material, overcomes the defects of large water absorption, easy pulverization, large volume shrinkage rate in slurry stirring, low later strength, hollowing and cracking and the like of the product, simultaneously makes up the defects of poor fire resistance, harmful gas generation at high temperature, low aging resistance and weather resistance, large rebound elasticity in construction and the like of the organic material of the polyphenyl granules, and can effectively improve the construction performance, the fire resistance, the cracking resistance and the weather resistance of the gypsum-based interior wall putty.

Preferably, the bulk density is 100-³The expanded and vitrified micro-beads replace a plurality of traditional lightweight aggregates such as fly ash floating beads, glass micro-beads, expanded perlite, polyphenyl particles and the like as aggregates, and not only improves the workability and the fluidity of the product, but also reduces the breakage rate of the aggregates in the process of preparing the gypsum-based interior wall putty, so that the thermal and mechanical properties of the gypsum-based interior wall putty are more stable.

Typically, but not by way of limitation, the volume weight of the expanded and vitrified beads is, for example, 100, 102, 105, 108, 110, 112, 115, 118 or 120kg/m³。

Further preferably, the expanded and vitrified micro bubbles are pitchstone expanded and vitrified micro bubbles.

[ Cement ]

The strength and hardness of the gypsum-based interior wall putty can be improved by adding the cement into the gypsum-based interior wall putty.

Preferably, when the adopted cement is portland cement, the strength and hardness and the water resistance of the product are improved.

Typically, but not by way of limitation, the cement employed in the present invention is 42.5 portland cement.

[ Quartz sand ]

The quartz sand is quartz particles formed by crushing quartz stone, and has excellent heat resistance, fire resistance and corrosion resistance.

The addition of the quartz sand into the gypsum-based interior wall putty provided by the invention is beneficial to improving the fireproof performance, the heat resistance and the corrosion resistance of the gypsum-based interior wall putty.

Preferably, when the particle size of the quartz sand is 120-220 meshes, a fine and smooth putty layer can be obtained during construction.

Typically, but not by way of limitation, the silica sand has a particle size of, for example, 120, 150, 180, 200, or 220 mesh.

[ Compound rubber powder ]

In a preferred scheme of the invention, the compound rubber powder compounded by the styrene-acrylic rubber powder and the EVA rubber powder is used as a raw material, so that the cohesion of the gypsum-based interior wall putty is favorably improved, and the water resistance of the gypsum-based interior wall putty is improved by utilizing the characteristic that acrylic acid is not easy to dissolve in water after film formation.

In the present invention, the EVA rubber powder refers to ethylene-vinyl acetate copolymer rubber powder.

Preferably, when the mass ratio of the styrene-acrylic rubber powder to the EVA rubber powder is 1: (1-3), the prepared gypsum-based interior wall putty has more excellent mechanical property and water resistance, and particularly, when the mass ratio of the styrene-acrylic adhesive powder to the EVA adhesive powder is 1:2, the prepared gypsum-based interior wall putty has better mechanical property and water resistance.

Typically, but not limitatively, in the composite rubber powder, the mass ratio of the styrene-acrylic rubber powder to the EVA rubber powder is 1:1, 1:1.5, 1:2, 1:2.5 or 1: 3.

In a preferred scheme of the invention, the raw materials of the gypsum-based interior wall putty also comprise a filler and an auxiliary agent, so that the cost is reduced and the comprehensive performance of the gypsum-based interior wall putty is improved.

[ Filler ]

In a preferred embodiment of the present invention, the filler is heavy calcium carbonate (ground calcium carbonate) to facilitate the reduction of the cost of the gypsum-based interior wall putty and to improve the weather resistance of the gypsum-based interior wall putty.

In a preferred scheme of the invention, when the amount of the filler in the gypsum-based interior wall putty is 5-20 parts by mass, the mechanical property of the gypsum-based interior wall putty is ensured and the cost is reduced.

Typically, but not by way of limitation, in the gypsum-based interior wall putty provided herein, the filler is used in an amount of, for example, 5, 8, 10, 12, 15, 18, or 20 parts by mass.

[ auxiliary Agents ]

In a preferred scheme of the invention, the auxiliary agent comprises one or more of a water-retaining agent, a water reducing agent, a smoothing agent, a retarder or a water repellent, so that the mechanical property, the heat insulation property, the water resistance, the weather resistance and the like of the gypsum-based interior wall putty are improved.

Preferably, the gypsum-based interior wall putty provided by the invention comprises, by mass, 0.2-0.4 part of a water-retaining agent, 0.2-0.5 part of a water reducing agent, 0.1-0.3 part of a smoothing agent, 0.01-0.03 part of a retarder and 0.1-0.3 part of a water repellent.

Typically, but not by way of limitation, in the gypsum-based interior wall putty provided by the present invention, the amount of water retaining agent is, for example, 0.2, 0.25, 0.3, 0.35, or 0.4 parts; the amount of the water reducing agent is 0.2, 0.3, 0.4 or 0.5 part; the amount of retarder is 0.01, 0.015, 0.02, 0.025 or 0.3 part; the amount of the water repellent is 0.1, 0.15, 0.2, 0.25 or 0.3 part.

Preferably, the retarder is a novel retarder mainly compounded by citric acid, borax and tartaric acid, so that the retarding time of the gypsum-based interior wall putty is favorably prolonged, and the loss of the common retarder to the strength of the gypsum-based putty is reduced.

Further preferably, in the retarder, the mass ratio of citric acid to borax to tartaric acid is (0.08-0.1): 1: (0.008-0.012), which is more beneficial to prolonging the retarding time of the gypsum-based putty and reducing the strength loss, and particularly, when the mass ratio of citric acid, borax and tartaric acid in the retarder is 0.09:1:0.01, the prepared novel retarder has more remarkable performance in the aspects of prolonging the time of gypsum-based putty around the river and reducing the strength loss.

Typically, but not by way of limitation, the mass of citric acid, borax and tartaric acid in the retarder is, for example, 0.08:1:0.008, 0.08:1:0.01, 0.08:1:0.012, 0.09:1:0.008, 0.09:1:0.01, 0.09:1:0.012, 0.1:1:0.08, 0.1:1:0.01 or 0.1:1: 0.012.

In a typical embodiment of the invention, the water retaining agent is HPMC (hydroxypropylcellulose) 40000 mpa.s.

In one embodiment of the invention, the slip agent is a thixotropic slip agent, preferably magnesium aluminum silicate having a pH of 8 to 9.

In one embodiment of the invention, the water reducing agent is a polycarboxylic acid water reducing agent, preferably ZJ-8020 which is a Jiangsu Mega building material.

In one scheme of the invention, the water repellent is an organic silicon water repellent, preferably ZJ-S80 of Jiangsu Mega building materials.

In a preferred embodiment of the present invention, the preparation method of the gypsum-based interior wall putty comprises the following steps: uniformly mixing the desulfurized gypsum composition, cement, quartz sand, composite rubber powder, expanded and vitrified micro balls, optional fillers and optional auxiliaries to obtain the gypsum-based interior wall putty.

Preferably, the cement, the quartz sand and the optional filler are mixed uniformly, and then the expanded and vitrified micro bubbles are added and mixed uniformly.

In a preferred scheme of the invention, the construction method of the gypsum-based interior wall putty comprises the following steps:

after the gypsum-based interior wall putty is uniformly dispersed in water, the construction of the gypsum-based interior wall putty is carried out.

Preferably, the amount of water added is from 40% to 50% (by mass), more preferably 45%, of the gypsum-based interior wall putty.

Preferably, a batch cutter is adopted to be matched with a large scraper for single-pass construction.

Preferably, the construction thickness is 5-20 mm.

Preferably, the construction temperature is 5-35 ℃.

The gypsum-based interior wall putty provided by the invention can be directly stirred for construction, so that the construction procedures are effectively reduced, the working hours are shortened, and the construction efficiency is improved.

According to a fourth aspect of the present invention, there is provided the use of a desulfurized gypsum composition or gypsum-based interior wall putty in a building.

In order to facilitate understanding of those skilled in the art, the technical solutions provided by the present invention will be further described below with reference to examples and comparative examples.

The percentages and parts in the following examples and comparative examples are in parts by mass, the manufacturers and the types of the raw materials used are shown in table 1, and the raw materials not shown in table 1 are commercially available.

TABLE 1

Name (R)	Performance parameter	Manufacturer model
			Cement	42.5 Portland cement	Is commercially available
Quartz sand	120-220 mesh	Is commercially available
			Desulfurized gypsum powder	60-mesh full-through	Shandong Longyuan plaster
Water-retaining agent	HPMC of 40000mPa.s	Is commercially available
			Polycarboxylic acid water reducing agent	——	Jiangsu megabuilding material ZJ-8020
Thixotropic smoothing agent	Magnesium aluminum silicate with pH value of 8-9	Is commercially available
			Organic silicon water repellent	——	Jiangsu Megazepine ZJ-S80
Rosin salt expanded vitrified micro-bead	(capacity 100-3)	Is commercially available
			Styrene-acrylic rubber powder	——	Seranies FX7000
EVA rubber powder	——	Seranibs 80W

Example 1

The embodiment provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the compound retarder is formed by ternary compounding of citric acid, borax and tartaric acid according to the mass ratio of 0.09:1: 0.01; the compound rubber powder is prepared by compounding styrene-acrylic rubber powder and EVA rubber powder according to the mass ratio of 1: 2; the desulfurized gypsum composition is prepared according to the following steps: calcining the desulfurized gypsum powder at 175 ℃ for 90min, performing air separation and aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 35% for 14 days.

Example 2

The embodiment provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 180 ℃ for 110min, performing winnowing aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 50% for 14 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Example 3

The embodiment provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 160 ℃ for 100min, performing air separation and aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 40% for 14 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Example 4

The embodiment provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 165 ℃ for 100min, performing air separation and aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 40% for 14 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Example 5

The embodiment provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 160 ℃ for 100min, performing winnowing aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 50% for 13 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Example 6

The embodiment provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 180 ℃ for 100min, performing winnowing aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 30% for 15 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Example 7

The embodiment provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 180 ℃ for 90min, performing air separation and aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 30% for 14 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Example 8

The embodiment provides gypsum-based interior wall putty, which is different from embodiment 3 in that a composite retarder is formed by ternary compounding of citric acid, borax and tartaric acid according to the mass ratio of 0.08:1:0.012, and the rest raw materials and the composition are the same as those in embodiment 3 and are not repeated herein.

Example 9

The embodiment provides gypsum-based interior wall putty, which is different from embodiment 3 in that a composite retarder is formed by ternary compounding of citric acid, borax and tartaric acid according to the mass ratio of 0.1:1:0.008, and the rest raw materials and the composition are the same as those in embodiment 3 and are not repeated herein.

Comparative example 1

The comparative example provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 230 ℃ for 110min, performing air separation and aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 20% for 14 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Comparative example 2

The comparative example provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 220 ℃ for 110min, performing air separation and aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 35% for 14 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Comparative example 3

The comparative example provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 210 ℃ for 110min, performing air separation and aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 35% for 14 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Comparative example 4

The comparative example provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 240 ℃ for 70min, performing air separation and aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 40% for 14 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Comparative example 5

The comparative example provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein the sulfur gypsum composition is prepared by the following steps: calcining the desulfurized gypsum powder at 190 ℃ for 75min, performing winnowing aging at the speed of 10m/s by a high-speed fan, and aging in a closed room with the humidity of 40% for 14 days; the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Comparative example 6

The comparative example provides gypsum-based interior wall putty, which is different from the putty in the example 3 in that styrene-acrylic rubber powder is adopted to replace composite rubber powder.

Comparative example 7

The comparative example provides gypsum-based interior wall putty, which is different from the putty prepared in the example 3 in that EVA rubber powder is adopted to replace composite rubber powder.

Comparative example 8

The comparative example provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

wherein, each raw material is the same as the raw material adopted in example 3 in batch, and the description is omitted here.

Comparative example 9

The comparative example provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

comparative example 10

The comparative example provides gypsum-based interior wall putty, which comprises the following raw materials in parts by weight:

the sulfur gypsum composition, the composite retarder and the composite rubber powder are in the same batch as the composite retarder and the composite rubber powder adopted in the embodiment 1, and are not described again.

Test examples

The putty for interior walls provided in examples and comparative examples were uniformly mixed by adding water in an amount of 45% by mass, respectively, and then the initial dry cracking resistance, drying time, standard state adhesive strength, post-immersion adhesive strength, water resistance, workability, and initial setting time were measured, and the results are shown in table 2 below.

The test method is as follows:

(1) the detection methods of initial dry cracking resistance, drying time, workability, and water resistance refer to the test methods in JG/T298-2010, wherein 5 pieces of initial dry cracking-resistant test specimens are prepared.

(2) Method for detecting standard state bonding strength and bonding strength after soaking in water on the basis of referring to the test method in JG/T298-2010, a 3mm thick mold frame sample is adopted.

(3) The initial setting time refers to the determination of initial setting time in 7.4.2 in GB/T28627-2012.

TABLE 2

It can be seen from the comparison between examples 1-9 and comparative examples 1-10 in table 2 that the gypsum-based interior wall putty provided by examples 1-9 of the present invention uses desulfurized gypsum composition instead of conventional gypsum as raw material and cooperates with cement, quartz sand, compound rubber powder and expanded vitrified micro beads in specific mass ratio, so that the gypsum-based interior wall putty has not only good water resistance and moisture resistance, can be used in high humidity environment, but also has stable retardation time, can prevent cracking, and also has excellent workability and fluidity, and stable thermal and mechanical properties.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.