CN103086734B - Inorganic foamed concrete insulation board and preparation method thereof - Google Patents

Inorganic foamed concrete insulation board and preparation method thereof Download PDF

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CN103086734B
CN103086734B CN201110341905.1A CN201110341905A CN103086734B CN 103086734 B CN103086734 B CN 103086734B CN 201110341905 A CN201110341905 A CN 201110341905A CN 103086734 B CN103086734 B CN 103086734B
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cement
concrete
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weight ratio
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CN103086734A (en
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杨奎利
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杨奎利
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Abstract

The invention provides an inorganic foamed concrete insulation board and a preparation method thereof. The insulation board comprises foamed concrete, and has density of 160-250kg / m<3>, compressive strength of 0.3-0.5 MPa, and coefficient of thermal conductivity of 0.05-0.062 W / m.K. The prepared insulation board has the characteristics of low unit weight and good heat insulation effect, and can be widely used as an insulation material in the field of construction.

Description

Inorganic foaming concrete heat-insulating board and preparation method thereof
Technical field
The present invention relates to a kind of lagging material and preparation method thereof, especially a kind of inorganic foaming concrete heat-insulating board and preparation method thereof.
Background technology
Foamed concrete, claims again foamed concrete, is by the mode of chemistry or physics, according to application needs, nitrogen, carbonic acid gas, oxygen or air are introduced in concrete mortar, through overmolding, reasonable maintenance, made to form the concrete product that contains a large amount of holes and there is some strength.Foamed concrete, by composition consolidating material, can be divided into cement foam concrete, pore magnesite foam concrete, gypsum foamed concrete, volcano grey matter consolidating material foamed concrete; By the kind of main filler used, can be divided into fly ash foam concrete, slag foamed concrete, straw foam concrete; By density, generally can be divided into six grades, i.e. 300kg%m 3, 400kg%m 3, 500kg%m 3, 600kg%m 3, 700kg%m 3, 800kg%m 3; By using function, can be divided into thermal-insulating type, insulation construction type, structure-type; Room be can be divided into by Application Areas and foamed concrete, gardens foamed concrete, engineering foamed concrete, industrial foamed concrete built; Press maintenance method, can be divided into natural curing foamed concrete, vapor cure foamed concrete, steam press maintenance foamed concrete.
The introducing of bubble makes foamed concrete possess light weight, the advantage of levelling automatically, and its heat insulation performance also significantly improves, and construction carries more conveniently, has not only reduced goods cost, and has expanded greatly the Application Areas of cement products.
The raw material of foamed concrete mainly contains cement, aggregate (auxiliary agent) and whipping agent.Cement is one of main raw material of foamed concrete, plays cohesive action.The cement setting intensity of different labels is different with time of coagulation, even the cement of same numeral, due to the difference of manufacturer, its composition also there are differences.Therefore, in principle, to same whipping agent, must, on the basis of lab scale, could construct on a large scale.
Aggregate, needing according to purposes can be sand, haydite, float stone, pearlstone, flyash and ironmaking slag etc., and wherein flyash and ironmaking slag belong to utilization of waste material, and tool application and development is worth.
Whipping agent is pore forming material, suds-stabilizing agent, tie up the general name of the auxiliary agents such as aqua.Pore forming material is can
There is chemical reaction and produce the material of gas.Suds-stabilizing agent refers to the tensio-active agent with steady bubble effect, as dodecyl phenenyl sulfate, protein hydrolysate etc.Tie up the auxiliary agents such as aqua and refer to that those can pass through interaction of hydrogen bond with tensio-active agent water-wet side, and the material of strong adsorption water molecules and bubble surface, as polyacrylamide, gum arabic etc.Generally speaking, the whipping agent of simple a kind of material composition, is difficult to make high-performance, low-density foamed concrete.Just introduce the mode of gas, foaming mode can be divided into two classes: physical blowing (also claiming inorganic foamed) and chemical foaming.Physical blowing is by mechanical method, air, nitrogen, hydrogen, carbon dioxide gas or oxygen to be incorporated in the slurry being formed by cement, aggregate, suds-stabilizing agent and water, makes it to form a metastable system.Should be greater than the presetting period of cement the steady time of this metastable system.Chemical foaming agent is the material (pore forming material) that chemical reaction can occur and produce object gas with cement, aggregate, suds-stabilizing agent, ties up aqua and water is mixed together evenly, then casting, controlling temperature makes pore forming material reaction produce bubble, its best response behaviour is reaction hardly during mixing moulding, and after moulding and progressively reflected complete before cement initial set.From above analysis, physical blowing requires high to the requirement of suds-stabilizing agent (being also often generally called whipping agent in production) than chemical foaming.That is to say with same suds-stabilizing agent, the concrete quality that adopts chemical foaming to make than physical blowing is quite a lot of.But chemical foaming is harsher to the requirement of temperature, time.The cement blowing agent of early application is more single, as rosined soap, dodecyl phenenyl sulfate (the real suds-stabilizing agent that belongs to).In the situation that introducing gas with machinery, although their foam expansion is high, foam stability is poor, is difficult to make 1g/cm 3following foamed concrete.Later stage is used protein type whipping agent (being obtained by animal hoof and foot, blood, hair-hydrolyzation), although foam expansion is not as the former, but because it has steady bubble concurrently, ties up water function, thereby make foam longer the steady time in grout, the foamed concrete making is also better.The cement blowing agent that current people use, mostly through the composite product forming, as CON~A type foaming agent, CCW~95 type solid blowing agent, U-shaped whipping agent, HJ~3 type vitriol series micro-bubble agent, Japan produce protein type whipping agent Escort K and Qinghai 3% type whipping agent etc. according to physical and chemical principle.
The preparation technology of foamed concrete mainly contains chemical foaming technology (Fig. 1) and physical blowing technique (Fig. 2).As shown in Figure 1, chemical foaming technology machinery used is fairly simple, is exactly stirrer and transferpump substantially, still, because grout is after cast, before initial set, pore forming material continues to produce bubble, thereby has expansion, therefore chemical foaming technology is used for the occasions such as filling, leak stopping, reinforcing, when making warming plate, due to harsher to the requirement of temperature, time, therefore yield rate is low, and is unsuitable for scale operation.Physical blowing technique, due to the interaction without considering whipping agent and suds-stabilizing agent, therefore, selects degree of freedom large, and preparation speed is fast, is used for the fields such as floor heating, Horizon, roof side slope, precoated plate.Physical blowing technique than chemical foaming technology many air compressor and frothing machine, the at present concrete foaming machine of existing various employing physical blowing technique on the market, its principle and structure are basic identical, all comprise transferpump, frothing machine and air compressor machine.The key distinction of various concrete foaming machines is wherein frothing machine difference, but existing various concrete foaming machine, in the time using physical blowing technique at processing warming plate, all exists the shortcomings such as warming plate unit weight is high, thermal conductivity is poor, time of coagulation is long, easily subside.
Summary of the invention
The present invention be directed to the technical problems such as the warming plate unit weight existing in the conventional physical foamed concrete warming plate course of processing is high, thermal conductivity is poor, time of coagulation is long, easily subside, a kind of novel inorganic foamed concrete warming plate and preparation method thereof is provided.
A kind of inorganic foaming concrete heat-insulating board provided by the invention, contains concrete, and the density of warming plate is 160~250kg/m 3, ultimate compression strength is 0.3~0.5MPa, thermal conductivity is 0.05~0.062W/m.K.
The preferred technical scheme of the present invention is that the density of warming plate is 180~230kg/m 3.
The preparation method of a kind of inorganic foaming concrete heat-insulating board provided by the invention, the density of warming plate is 160~250kg/m 3, ultimate compression strength is 0.3~0.5MPa, thermal conductivity is 0.05~0.062W/m.K, comprise the steps: A: by cement, water and auxiliary agent are once stirred to after mixing evenly, once stirred thing, described auxiliary agent comprises toughener, hardening accelerator, calcium formiate, water reducer, water-resisting agent and calcium stearate, the weight ratio of described cement and water is: 1:0.6~0.7, the weight ratio of described toughener and cement is 0.1~0.5:1, described hardening accelerator, described calcium formiate, described water reducer, the weight ratio of described water-resisting agent and described calcium stearate and described cement is: 0.2%~0.5%:1, toughener is latex powder or industrial emulsion, B: the above-mentioned thing that once stirs is pulverized, obtained crushed material, C: add fiber and carry out secondary stirring to evenly in above-mentioned crushed material, obtain secondary stirring thing, the weight ratio of described fiber and described cement is: 0.1%~0.3%:1, the length of fiber is 4~7mm, D: above-mentioned secondary stirring thing is poured into a mould after by physical blowing, obtained goods.
Preferably, the density of warming plate is 180~230kg/m 3.
In preparation technology of the present invention, the function of toughener is to improve the intensity of warming plate, and the effect of fiber is to strengthen the resistance to fracture of warming plate.
The present invention, owing to adopting above-mentioned technique, after concrete-agitating, before foaming, pulverizes, and makes concrete particle minimum, thereby fully and is equably suspended in water, and make concrete uniform in foaming subsequently, without sedimentation phenomenon.Make like this warming plate keeping the low-density while, improved pressure resistance, insulation and soundproof effect, and the technical problem that has effectively solved sedimentation in production process and subsided.
Inorganic foaming concrete heat-insulating board density of the present invention is little, and thermal conductivity is little, therefore little the and high insulating effect of unit weight.
Brief description of the drawings
Fig. 1 is the schema of traditional chemical foaming technology.
Fig. 2 is the schema of traditional physics (inorganic) foam process.
Fig. 3 is the schema of physical blowing technique of the present invention.
Embodiment
Now, the embodiment that present invention will be described in detail with reference to the accompanying.
Fig. 3 is the schema of physical blowing technique of the present invention.
As shown in the figure, first, cement is mixed with water, auxiliary agent (toughener, hardening accelerator, calcium formiate, water reducer, water-resisting agent and calcium stearate), and stir (one-time mechanical stirring); Then the mixture of described cement, water and auxiliary agent after stirring is pulverized; Then in the mixture after pulverizing, add fiber and stir (secondary mechanical stirring); The mixture of cement, water, auxiliary agent and fiber after stirring is injected to mould (cast) afterwards by mechanical foaming (foaming by concrete foaming machine).
Embodiment 1:
No. 32.5 cement, water, latex powder, hardening accelerator, calcium formiate, water reducer, water-resisting agent and calcium stearates are mixed according to the weight ratio of 1:0.6:0.1:0.2%:0.2%:0.2%:0.2%:0.2%, and be once stirred to evenly; Then, will stir thing pulverizes; Then, will after crushed material and blending in of fibers, carry out secondary stirring to even, the weight ratio of described fiber and described cement is 0.1%:1, afterwards secondary stirring thing is foamed by concrete foaming machine, pours into a mould afterwards.
Embodiment 2:
No. 32.5 cement, water, latex powder, hardening accelerator, calcium formiate, water reducer, water-resisting agent and calcium stearates are mixed according to the weight ratio of 1:0.7:0.5:0.5%:0.5%:0.5%:0.5%:0.5%, and be once stirred to evenly; Then, will stir thing pulverizes; Then will after crushed material and blending in of fibers, carry out secondary stirring to even, the weight ratio of described fiber and described cement is 0.3%:1, afterwards secondary stirring thing is foamed by concrete foaming machine, then pours into a mould.
Embodiment 3:
No. 32.5 cement, water, industrial emulsion, hardening accelerator, calcium formiate, water reducer, water-resisting agent and calcium stearates are mixed according to the weight ratio of 1:0.65:0.3:0.4%:0.4%:0.4%:0.4%:0.4%, and be once stirred to evenly; Then, will stir thing pulverizes; Then will after crushed material and blending in of fibers, carry out secondary stirring to even, the weight ratio of described fiber and described cement is 0.2%:1, afterwards secondary stirring thing is foamed by concrete foaming machine, then pours into a mould.
Embodiment 4: adopt physical blowing technique preparation of the present invention
No. 32.5 cement are mixed according to foregoing ratio with water and auxiliary agent (latex powder, hardening accelerator, calcium formiate, water reducer, water-resisting agent and calcium stearate), once be stirred to evenly, then pulverize, in crushed material, proportionally add blending in of fibers, carry out secondary stirring to even.Then after concrete foaming machine foaming, inject mould, make finished product, after four hours, can obtain a result.
The warming plate of making through above method did not subside after four hours, and grout merges evenly with bubble, initial set.After the demoulding in second day, product solidifies well with hand up by there being intensity, and product can erect.
Density 160~250kg/m 3
Ultimate compression strength 0.3~0.5MPa
Water-absorbent 10%~20%
Thermal conductivity 0.05~0.062W/m.K
Comparative example 1: adopt chemical foaming technology to prepare warming plate
First water is heated to 50-60 degree, then add stirrer to stir in warm water, then add stirrer to stir 0.5-1 minute in cement, flyash (1:0.7~0.8), then add again other raw materials according to the weight percent of cement, (calcium stearate 0.8~2%, anti-crack fiber 0.2%, hydrogen peroxide 27%, polymer emulsion 2~4%, SILICA FUME 3~6%, latex powder are appropriate, high efficiency water reducing agent 1%, water-resisting agent 5%) stirs 0.5-1 minute, finally whipping agent is added stirrer to stir after 0.5-1 minute and emits.
The warming plate internal stress made through above method is easy to crack, ultimate compression strength is low, and to the temperature requirement of water is higher must be between 50-60 degree.All requirements of process manual operations in process of production, product do not reach require and efficiency also low.
The result that the product test of being done by above method goes out:
Density 250~600kg/m 3
Ultimate compression strength 0.2~0.4MPa
Water-absorbent 15%~25%
Thermal conductivity 0.05~0.10W/m.K
Comparative example 2: adopt the preparation of conventional physical foam process
First water is joined to agitation vat, then cement (No. 32.5 cement) is added to agitation vat, add 3% rubber powder, 0.5% fiber stirs, and after concrete foaming machine foaming, injects mould, makes finished product.After four hours, can obtain a result.The warming plate of making through above method has two kinds of phenomenons; 1. the current in mould lose, and grout subsides at least to 1/2 of mould, experimental result failure.2. the grout initial set in four hours rear molds, the demoulding in second day is through natural curing in a few days, and after cutting, warming plate does not obviously have intensity surface one deck powder.
The product test result of being made by above method:
Density 350~600kg/m 3
Ultimate compression strength 0.8~1.2MPa
Water-absorbent 30%~50%
Thermal conductivity 0.07~0.10W/m.K
In above-described embodiment and comparative example, cement adopts No. 32.5, and testing method is the mensuration heat flowmeter method of GB/T10295-2008 Technology of Steady State Thermal Resistance of Thermal Insulating Material and related characteristics.
But the invention is not restricted to this, for example, can use 42.5,62.5 etc.In addition, the latex powder using in embodiment is the production of Shanxi San Wei Group Plc, and model is: SWF-05; Water-resisting agent is that Cape of Good Hope, Taiyuan building materials company limited produces, and model is YF; Hardening accelerator is that Shanghai Feibu Building Materials Co., Ltd. produces, and model is FB-2; Calcium formiate is that Wujiang south wind Fine Chemical Co., Ltd produces, and model is 98%; Calcium stearate is that the far-reaching additive of Xiaogan company limited generates, and model specification is 25kg/ bucket; Water reducer is that Nanchang Hao Ge Science and Technology Ltd. generates, and model is F10; Fiber is that Shenzhen perseverance reaches the sale of building materials sale company limited, and model is K1W-001.
In addition, consider the combination of production cost and result of use, preferably 180~230kg/m of the density of warming plate of the present invention 3.By experimental results show that above warming plate of the present invention has that unit weight is low, uniform in foaming, the feature of thermal conductivity little (being high insulating effect), warming plate preparation technology of the present invention is compared with traditional chemical foaming, physical blowing technique, yield rate is high, and production efficiency also significantly improves.
Only as described above; be only specific embodiments of the invention, when not limiting scope of the invention process with this, therefore the displacement of its equivalent assemblies; or equivalent variations and the amendment done according to scope of patent protection of the present invention, all should still belong to the category that the claims in the present invention book is contained.

Claims (2)

1. a preparation method for inorganic foaming concrete heat-insulating board, is characterized in that, the density of described warming plate is 160~250kg/m 3, ultimate compression strength is 0.3~0.5MPa, and thermal conductivity is 0.05~0.062W/m.K, and described method comprises the steps:
A: be once stirred to evenly after cement, water and auxiliary agent are mixed, once stirred thing, described auxiliary agent comprises toughener, hardening accelerator, calcium formiate, water reducer, water-resisting agent and calcium stearate, the weight ratio of described cement and water is: 1:0.6~0.7, the weight ratio of described toughener and cement is 0.1~0.5:1, and the weight ratio of described hardening accelerator, calcium formiate, water reducer, water-resisting agent and calcium stearate and cement is: 0.2%~0.5%:1; Described toughener is latex powder or industrial emulsion;
B: the above-mentioned thing that once stirs is pulverized, obtained crushed material;
C: add fiber and carry out secondary stirring to evenly in above-mentioned crushed material, obtain secondary stirring thing, the weight ratio of described fiber and cement is: 0.1%~0.3%:1, the length of described fiber is 4~7mm;
D: above-mentioned secondary stirring thing is poured into a mould after by physical blowing, obtained goods.
2. inorganic foaming concrete heat-insulating board according to claim 1, is characterized in that: the density of described warming plate is 180~230kg/m 3.
CN201110341905.1A 2011-11-02 2011-11-02 Inorganic foamed concrete insulation board and preparation method thereof Expired - Fee Related CN103086734B (en)

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CN103304260B (en) * 2013-06-18 2016-01-20 上海宝冶工程技术有限公司 A kind of foamed concrete warming plate and preparation method thereof
CN104446633A (en) * 2014-12-23 2015-03-25 苏州万盛混凝土有限公司 Preparation method of foamed concrete
CN105217991B (en) * 2015-11-05 2017-09-29 青岛环秀涂料有限公司 A kind of cement foaming insulation board foam stabilizing sizing reinforcing agent and its application method
CN110968126A (en) * 2018-09-30 2020-04-07 北新集团建材股份有限公司 Gypsum board raw material constant temperature control system and control method
CN109734406B (en) * 2019-03-27 2019-07-16 山东淄建集团有限公司 Ceramic tile polishing mud and the heat insulating porous material of diatom soil matrix and preparation method thereof

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