CN108863265A - A kind of light cellular partition board gypsum based composite - Google Patents

Abstract

The invention discloses a gypsum-based composite material for lightweight partition boards. The material is composed of solid waste cement materials, active cement materials, aggregates, basalt fibers, composite admixtures and water. Among them, solid waste cementing materials include construction gypsum powder, fly ash and slag, active cementing materials include cement and quicklime, aggregates include anhydrite powder and vitrified microspheres, and composite admixtures include water-reducing components, waterproofing components, Water retention components and antibacterial components. The gypsum-based composite material for lightweight partition boards of the present invention has the advantages of light weight and high strength, thermal insulation and sound insulation, water resistance and mildew resistance, and is not easy to efflorescence.

Description

A kind of gypsum-based composite material for lightweight partition board

Technical field:

The invention relates to a gypsum-based composite material for a lightweight partition board, belonging to the field of building materials.

Background technique:

With the increasing global energy crisis and environmental degradation, the green energy-saving policy of the construction industry has been strongly encouraged and supported by government departments. The production of lightweight wall materials from solid waste materials is one of the important ways of building industrialization and building energy conservation. It can not only solve the pollution of the surrounding ecological environment when solid waste materials are piled up, but also turn waste into treasure, which has huge market promotion and Application prospect.

Gypsum is one of the three major cementitious materials in building materials, and building gypsum products have decades of production and application history in our country. At present, the bulk density of domestic gypsum-based wall materials is generally high, and the internal pore structure of the product is loose, thereby reducing its strength and water resistance. In practical engineering applications, especially when using industrial by-product gypsum, there are phenomena of efflorescence, yellowing and mildew, which greatly limit the popularization and application of gypsum-based wall materials in the construction field.

Invention content:

The present invention provides a gypsum-based composite material for lightweight partition boards in order to solve the problems existing in the above-mentioned prior art, which can reduce bulk density while ensuring considerable strength, improve water resistance, and avoid phenomena such as efflorescence cracking and mold. The scope of application is wider.

The technical scheme adopted in the present invention includes: a gypsum-based composite material for lightweight partition boards, consisting of: 65-75 parts of solid waste cementing material; 20-30 parts of active cementing material; 15-25 parts of aggregate; basalt 0.1-0.6 parts of fiber; 4-8 parts of compound admixture; 55-70 parts of water.

Further, the solid waste cementing material is composed of: 40-55 parts of construction gypsum powder; 18-25 parts of fly ash; and 3-8 parts of slag.

Further, the building gypsum powder is one or more of natural gypsum, desulfurized gypsum and phosphogypsum, with a fineness of 150-250 mesh, an initial setting time of 4-6 minutes, a final setting time of 10-15 minutes, and a 2-hour compressive strength ≥ 3.5MPa, 2h flexural strength ≥ 1.8MPa; the fly ash is grade II low-calcium fly ash; the slag fineness is 200-300 mesh, 7d activity index ≥ 75%, vitreous content ≥ 85%.

Further, the active cementing material is composed of: 10-25 parts of cement; 1-3 parts of quicklime; the cement is PO42.5 grade ordinary Portland cement; the calcium oxide content in the quicklime is ≥80%, and the magnesium oxide The content is ≤5%, and the fineness is 250-300 mesh.

Further, the aggregate is composed of: 10-18 parts of anhydrite powder; 3-8 parts of vitrified microbeads; the anhydrite powder is one or more of titanium gypsum, citrate gypsum and fluorogypsum. The density is 250-300 mesh; the bulk density of the vitrified microbeads is 80-120kg/m ³ , and it is hydrophobic;

Further, the length of the basalt fiber is 6mm or 12mm.

Further, the composite admixture is composed of: 0.5-1.5 parts of water-reducing component, 2-5 parts of waterproof component, 0.05-0.10 part of water-retaining component and 0.1-1.0 part of antibacterial component.

Further, the water-reducing component is one or more compositions of polycarboxylate water-reducer, melamine water-reducer and sulfamate water-reducer; the waterproof component is methylphenyl silicone oil, inorganic Aluminum salt, vinyl acetate, ethylene and higher fatty acid vinyl ester ternary copolymer rubber powder, paraffin and lithium carbonate; the water-retaining components are hydroxypropyl methylcellulose ether, starch ether and poly One or more compositions of vinyl alcohol; the antibacterial component is cetyl pyridinium chloride.

The present invention has following beneficial effect:

(1) Under the premise of meeting the technical indicators of wallboard application, desulfurization gypsum, phosphogypsum, titanium gypsum, citrate gypsum and fluorogypsum are mixed together, and desulfurization gypsum and phosphogypsum with good quality are selected to be calcined into building gypsum powder. Titanium gypsum with different phases is calcined into anhydrite powder, which improves the utilization rate of industrial by-product gypsum and reduces economic costs.

(2) The proportion of solid waste cementing material and active cementing material is appropriate, which can generate more ettringite and calcium silicate hydrate gel, etc., and has a dense overall structure, which can solidify and adsorb alkali metal ions and prevent them from migrating to the wall The surface of the material can effectively inhibit efflorescence.

(3) The composite admixture of the present invention has good adaptability to gypsum-based materials, can effectively reduce its water absorption rate, and improve the softening coefficient, and the bacteriostatic component cetylpyridium chloride can effectively kill heterotrophic bacteria , iron bacteria and sulfate-reducing bacteria, etc., are highly targeted and prevent mold.

Detailed ways:

The composition of the gypsum-based composite material for the lightweight partition board of the present invention is: 65-75 parts of solid waste cementing material; 20-30 parts of active cementing material; 15-25 parts of aggregate; 0.1-0.6 part of basalt fiber; composite admixture 4 to 8 parts; 55 to 70 parts of water.

The solid waste cementing material is composed of: 40-55 parts of construction gypsum powder; 18-25 parts of fly ash; 3-8 parts of slag.

The building gypsum powder is one or more of natural gypsum, desulfurized gypsum and phosphogypsum, fineness 150-250 mesh, initial setting time 4-6min, final setting time 10-15min, 2h compressive strength ≥ 3.5MPa, 2h Flexural strength ≥ 1.8MPa; fly ash is Class II low-calcium fly ash; slag fineness is 200-300 mesh, 7d activity index ≥ 75%, vitreous content ≥ 85%.

Among them, the active cementing material is composed of: 10-25 parts of cement; 1-3 parts of quicklime; the cement is P O42.5 grade ordinary Portland cement; the content of calcium oxide in quicklime is ≥80%, the content of magnesium oxide is ≤5%, and the fineness It is 250-300 mesh.

The aggregate composition is: 10-18 parts of anhydrite powder; 3-8 parts of vitrified microbeads; the anhydrite powder is one or more of titanium gypsum, citric acid gypsum and fluorogypsum, and the fineness is 250-300 mesh ;The packing density of vitrified microbeads is 80～120kg/m ³ , hydrophobic type;

Among them, 0.1-0.6 parts of basalt fiber; the length of basalt fiber is 6 mm or 12 mm.

The composite admixture is composed of: 0.5-1.5 parts of water-reducing component, 2-5 parts of waterproof component, 0.05-0.10 part of water-retaining component and 0.1-1.0 part of antibacterial component.

The water-reducing component is one or more compositions of polycarboxylate water-reducer, melamine water-reducer and sulfamate water-reducer; the waterproof component is methylphenyl silicone oil, inorganic aluminum salt, vinyl acetate Composition of one or more of ethylene and higher fatty acid vinyl ester ternary copolymer rubber powder, paraffin and lithium carbonate; water retention component is one or more of hydroxypropyl methylcellulose ether, starch ether and polyvinyl alcohol Composition; antibacterial component is hexadecyl pyridinium chloride.

The gypsum-based composite material for lightweight partition wall panels of the present invention will be specifically described below through four examples.

Example 1

Weigh 50 parts of construction gypsum powder, 18 parts of fly ash, 5 parts of slag, 21 parts of cement, 3 parts of quicklime, 10 parts of anhydrite powder, 3 parts of vitrified microbeads, 0.4 parts of basalt fiber, and composite admixture 6 parts and 65 parts water.

The construction gypsum powder used is desulfurized gypsum.

The anhydrite powder used is: in parts by weight, composed of 5 parts of titanium gypsum and 5 parts of citric acid gypsum.

The composite admixture used is: in parts by weight, it consists of 0.6 parts of polycarboxylate water reducer, 0.5 parts of methylphenyl silicone oil, 0.5 parts of inorganic aluminum salt, vinyl acetate, ethylene and higher fatty acid vinyl ester ternary 3 parts of copolymerized rubber powder, 0.03 part of hydroxypropyl methylcellulose ether, 0.03 part of starch ether, and 1 part of cetyl pyridinium chloride.

Its preparation method is:

(1) Stir the dry materials except building gypsum powder for 2 to 3 minutes to obtain the mixed material;

(2) After mixing the composite admixture with water, add it to the mixture and continue stirring for 1-2 minutes, then add construction gypsum powder and stir for 40-50 seconds to obtain a gypsum mixture;

(3) Pour the gypsum mixture into the mold, let it stand for 10 to 15 minutes, then demould, and let it be cured naturally.

Example 2

Weigh 45 parts of building gypsum powder, 20 parts of fly ash, 5 parts of slag, 20 parts of cement, 3 parts of quicklime, 15 parts of anhydrite powder, 4 parts of vitrified microbeads, 0.3 parts of basalt fiber, and composite admixture 6 parts and 60 parts water.

The adopted building gypsum powder is: in parts by weight, it consists of 10 parts of natural gypsum, 20 parts of desulfurized gypsum and 15 parts of phosphogypsum.

The anhydrite powder used is: in parts by weight, composed of 10 parts of titanium gypsum and 5 parts of fluorine gypsum.

The composite admixture used is: in parts by weight, 0.5 parts of melamine water reducer; 0.5 parts of methyl phenyl silicone oil, 2.5 parts of vinyl acetate, ethylene and higher fatty acid vinyl ester ternary copolymer rubber powder, 1 part of paraffin wax 0.02 part of hydroxypropyl methylcellulose ether, 0.03 part of starch ether, and 1 part of cetyl pyridinium chloride.

Its preparation method is:

(1) Stir the dry materials except building gypsum powder for 2 to 3 minutes to obtain the mixed material;

(2) After mixing the composite admixture with water, add it to the mixture and continue stirring for 1-2 minutes, then add construction gypsum powder and stir for 40-50 seconds to obtain a gypsum mixture;

(3) Pour the gypsum mixture into the mold, let it stand for 10 to 15 minutes, then demould, and then it can be cured naturally.

Example 3

Weigh 40 parts of construction gypsum powder, 20 parts of fly ash, 3 parts of slag, 22 parts of cement, 1.5 parts of quicklime, 15 parts of anhydrite powder, 4 parts of vitrified microbeads, 0.4 parts of basalt fiber, and 5 parts of composite admixture parts and 60 parts of water.

The adopted construction gypsum powder is: calculated in parts by weight, consisting of 20 parts of desulfurized gypsum and 20 parts of phosphogypsum.

The anhydrite powder used is: in parts by weight, it consists of 10 parts of titanium gypsum powder and 5 parts of citric acid gypsum.

The composite additives used are: in parts by weight, 0.5 parts of polycarboxylate superplasticizer, 0.5 parts of methylphenyl silicone oil, 1.5 parts of paraffin, 0.5 parts of lithium carbonate, and 0.04 parts of hydroxypropyl methylcellulose ether , 0.05 parts of polyvinyl alcohol, 0.5 parts of cetyl pyridinium chloride.

Its preparation method is:

(1) Stir the dry materials except building gypsum powder for 2 to 3 minutes to obtain the mixed material;

(2) After mixing the composite admixture with water, add it to the mixture and continue stirring for 1-2 minutes, then add construction gypsum powder and stir for 40-50 seconds to obtain a gypsum mixture;

(3) Pour the gypsum mixture into the mold, let it stand for 10 to 15 minutes, then demould, and let it be cured naturally.

Comparative example 4

Weigh 55 parts of building desulfurization gypsum powder, 25 parts of fly ash, 20 parts of cement and 65 parts of water by weight.

Its preparation method is:

(1) Stir the dry materials except building gypsum powder for 2 to 3 minutes to obtain the mixed material;

(2) After mixing the composite admixture with water, add it to the mixture and continue stirring for 1-2 minutes, then add construction gypsum powder and stir for 40-50 seconds to obtain a gypsum mixture;

(3) Pour the gypsum mixture into the mold, let it stand for 10 to 15 minutes, then demould, and let it be cured naturally.

Table 1 The performance index of the gypsum-based composite material for the light-weight partition board of the embodiment of the present invention and the comparative example

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, some improvements can also be made without departing from the principle of the present invention, and these improvements should also be regarded as the invention. protected range.

Claims (8)

1. A gypsum-based composite material for lightweight partition boards, characterized in that it consists of: 65-75 parts of solid waste cementing material; 20-30 parts of active cementing material; 15-25 parts of aggregate; 0.1-75 parts of basalt fiber 0.6 parts; 4-8 parts of compound admixture; 55-70 parts of water. 2. The gypsum-based composite material for lightweight partition boards as claimed in claim 1, characterized in that: the solid waste cementing material consists of: 40-55 parts of building gypsum powder; 18-25 parts of fly ash; slag 3 to 8 servings. 3. The gypsum-based composite material for lightweight partition boards as claimed in claim 2, characterized in that: the building gypsum powder is one or more of natural gypsum, desulfurized gypsum and phosphogypsum, with a fineness of 150-250 The initial setting time is 4-6min, the final setting time is 10-15min, the 2h compressive strength is ≥3.5MPa, and the 2h flexural strength is ≥1.8MPa; the fly ash is grade II low-calcium fly ash; the slag is fine The degree is 200-300 mesh, the 7d activity index is ≥75%, and the vitreous content is ≥85%. 4. The gypsum-based composite material for lightweight partition boards as claimed in claim 1, wherein the active cementitious material consists of: 10-25 parts of cement; 1-3 parts of quicklime; and the cement is P O42 .5 grade ordinary portland cement; the content of calcium oxide in the quicklime is ≥80%, the content of magnesium oxide is ≤5%, and the fineness is 250-300 mesh. 5. The gypsum-based composite material for lightweight partition boards according to claim 1, characterized in that: the aggregate consists of: 10-18 parts of anhydrite powder; 3-8 parts of vitrified microbeads; The anhydrite powder is one or more of titanium gypsum, citrate gypsum and fluorogypsum, with a fineness of 250-300 mesh; the bulk density of the vitrified microbeads is 80-120 kg/m ³ , and is hydrophobic. 6. The gypsum-based composite material for lightweight partition boards according to claim 1, characterized in that: the length of the basalt fiber is 6mm or 12mm. 7. The gypsum-based composite material for lightweight partition boards according to claim 1, characterized in that: the composite admixture consists of: 0.5-1.5 parts of water-reducing components, 2-5 parts of waterproof components, water-retaining components 0.05-0.10 parts of components and 0.1-1.0 parts of antibacterial components. 8. The gypsum-based composite material for lightweight partition boards as claimed in claim 6, wherein the water-reducing components are polycarboxylate water-reducers, melamine water-reducers and sulfamate water-reducers One or more components; the waterproof component is one or more of methyl phenyl silicone oil, inorganic aluminum salt, vinyl acetate, ethylene and higher fatty acid vinyl ester ternary copolymer rubber powder, paraffin and lithium carbonate Composition; the water-retaining component is composed of one or more of hydroxypropyl methylcellulose ether, starch ether and polyvinyl alcohol; the antibacterial component is cetyl pyridinium chloride.