CN101362361A - Preparation method of wall heat insulating material - Google Patents

Abstract

The invention relates to a preparation method for a wall thermal insulation material, which belongs to the thermal insulation material preparation field. The invention provides a method which adopts light aggregate and cementing agent to prepare a bulk wall thermal insulation material and is realized by using a vertically combined type mixing device, and the method can effectively inhibit the aliquation phenomenon of the light aggregate. A gravity-free double-shaft mixer with a counter-rotating twin-shaft paddle shaped mixing blade is installed at the upper part, cement, fly ash and gelatine powder are added into the mixer by the mixer and mixed for 5 to 10 minutes, and then cementing agent is rapidly and evenly mixed; the light aggregate with 1-5 mm grain diameter is added to the mixed cementing agent, the volume ratio between the light aggregate and the cementing agent is 10-15:1, mixing is continued for 2 to 4 minutes, the light aggregate is discharged into a double helical ribbon mixer at the lower part by a discharging opening at the abdomen part of the gravity-free double-shaft mixer, the volume filling ratio reaches 60-80 percent, the mixing time is 1-3 minutes, the mixing uniformity is higher than 95 percent, and the formed wall thermal insulation material is used for energy conservation for buildings.

Description

Preparation method of wall heat insulating material

Technical field

The present invention relates to the building energy saving field preparation method of wall heat insulating material, particularly at the insulation material of material ratio heavy phase difference great disparity, adopt the mixer of combining structure up and down, can realize that aglite (as granular polystyrene, perlite, corncob, pottery sand) and cementing agent materials such as (cement, flyash, rubber powders) carry out well-mixed method, reach the requirement of building energy conservation site operation, effectively suppress aglite and produce at the segregation phenomena of insulation material in bulk.

Background technology

China is in Urban House construction and new countryside construction " two peak " period, is again the critical period of China's building energy conservation simultaneously, and new building insulation material and production technology thereof have the society and the market demand strongly and widely.Exterior-wall heat insulation will receive increasing concern with novel concrete base heat preserving and insulating material.And the light-weight building insulation material in bulk of China is mainly based on bi-component, and promptly aglite is a component, and cementing agent is a component, both are mixed respectively and packs.After being transported to the job site, again both are added to together in proportion, and add suitable water and carry out artificial or simple and mechanical mixing, the mixing apparatus of mixed method and use, can not guarantee that aglite evenly is blended in the cementing agent, the aglite segregation appears, in work progress, insulation material is applied on the metope very difficult, has a strong impact on efficiency of construction, the workmen spreads upon on the metope in order to make insulation material, will adopt the addition content that reduces aglite, improve the cementing agent consumption, solve to be coated with in the construction and spread the wall difficult problem, still can reduce the heat-insulating property of wall heat insulation material like this.Even some unit or individual mix by one pack system (aglite+cementing agent) system, owing to only be to adopt traditional simple mixer, traditional mixer mainly comprises trommel mixer, single shaft mixer, conical mixer, can not solve lightweight aggregate (granular polystyrene, perlite, corncob, pottery sand) too and when can or storage, produce the problem that powder/grain separates, especially to the material system of material ratio heavy phase difference great disparity, more can not satisfy the requirement that mixes.Building energy conservation wall heat insulation material in bulk, mainly with 70～95vol% aglite (granular polystyrene, perlite, corncob, pottery sand) and 5～30vol% cementing agent (cement, flyash, rubber powder) be main, their apparent density differs and reaches more than 100 times, in conventional hybrid equipment, will produce serious segregation, aglite is got together partially, at the construction field (site), after adding water still segregation phenomena can appear, the workmen still can't spread upon it on metope like this, even spread upon on the metope reluctantly, but its heat-insulating property and mechanical strength skewness, the thermal conductivity factor of general insulation material in bulk behind wall construction requires less than 0.068W/mK, and the thermal conductivity factor of segregation insulation material in bulk behind wall construction requires to have had a strong impact on the energy-conservation requirement of construction wall like this greater than 0.08W/mK, the intensity of heat-insulation layer, the construction instructions for use.Therefore, the one pack system wall heat insulation material in bulk of high mixture homogeneity becomes the key of building energy conservation development, must solve from the preparation method, can guarantee in work progress like this, no longer that works with the people's insulation material proportioning for a change of changing places as bicomponent system, both solve energy-saving effect, realized efficiency of construction again.

Summary of the invention

The object of the invention is, a kind of preparation method who is applicable to the one pack system insulation material in bulk of wall thermal insulating is provided, and can realize the differ greatly even mixing of material of material apparent density, satisfies the building energy conservation instructions for use.

The present invention has carried out a large amount of research work, found that: common mixed method and mixing apparatus are difficult to the differ greatly even mixing of material of material apparent density, conventional mixer is substantially based on a kind of mixing mechanism, and elementary mixing mechanism mainly contains diffusion mixing, convection current mixing, shear-mixed.The present invention mixes convection current with spreading to mix and organically combines, and utilizes the combination of mixing principle and device, solves the easy segregation phenomena of aglite in the insulation material in bulk, realizes a kind of one pack system preparation method of wall heat insulating material.

The present invention adopts the secondary hybrid mode, just can solve aglite (granular polystyrene, perlite, corncob, pottery sand) under twin shaft Agravicmixer Forced Mixing, increase the adhesive force (dust degree) of aglite particle surface, be that cementing agent is easily attached to the aglite surface, its combination realizes by mechanical bond and static combination, and then continue to enter in the double helical ribbon mixer and mix, under high fill-ratio and soft mixing condition, the diffusion that realizes the storeroom small spatial scale mixes, and effectively avoids the generation of segregation and classification.

The invention provides preparation method of wall heat insulating material is that aglite and cementing agent are mixed by specific mixing apparatus, and aglite mainly comprises one or both of granular polystyrene, perlite, corncob, pottery sand, its apparent density 10～200kg/m ³, granularity 1～5mm; Cementing agent mainly comprises cement, flyash, rubber powder, granularity 100～300 orders, its apparent density 900～2640kg/m ³Aglite and cementing agent volume ratio are 10～15:1, and the thermal conductivity factor of wall heat insulation material reaches 0.048～0.066W/mK.

Specific mixing apparatus of the present invention comprises what the agravic mixing apparatus of twin shaft and two ribbon mixing apparatus combined.

Preparation technology of the present invention: at first carry out in the twin shaft Agravicmixer, carrying out convection current and mix, ensure material rapid mixing significantly, shorten incorporation time, raise the efficiency, but its mixing uniformity still can not reach ideal state, mixture homogeneity can maintain 60～85% substantially, carry out in double helical ribbon mixer, spreading mixing subsequently, move by a small margin between the particle, both ensured between the material in flowability, can ensure that again the material that proportion, particle differ greatly does not produce the layering segregation phenomena, mixture homogeneity reaches more than 95%.

The equipment of the convection current mixing principle that the present invention adopts is the agravic mixing apparatus of twin shaft, the equipment of diffusion mixing principle be two ribbon mixing apparatus, its equipment compound mode be about compound mode, the agravic mixing apparatus of twin shaft is in the above, two ribbon mixing apparatus connect by scavenge port below.

Present invention be primarily characterized in that the agravic mixing apparatus of twin shaft drives by reducing motor, incorgruous rotation oar shape stirring vane is installed, and oar shape stirring vane is of a size of 120～240 * 150～300mm, rotating speed 35～58rpm, incorporation time is 5～10 minutes, and volume is 1～2m ³To meeting the mixer of the agravic mixing apparatus basic structure of twin shaft principle, carry out system test and find, its degree of mixing is main to have substantial connection with rotating speed and time, and its degree of mixing and rotating speed and incorporation time concern, see shown in Figure 1ly, select rational incorporation time and rotating speed with reference to Fig. 1.

Present invention be primarily characterized in that two ribbon mixing apparatus drive by reducing motor, a main shaft is installed, two ribbons are arranged, ribbon width 30～65mm, the ribbon gap is 30～50mm, 38 ° of spiral angles, rotating speed 40～65rpm, incorporation time is 2～4 minutes, volume is 1～2m ³To meeting the mixer of two ribbon mixing apparatus basic structure principles, carry out system test and find, its degree of mixing is main to have substantial connection with rotating speed and time, and its degree of mixing and rotating speed and incorporation time concern, see shown in Figure 2ly, select rational incorporation time and rotating speed with reference to Fig. 1.

Description of drawings

Fig. 1: the incorporation time and the rotating speed of twin shaft Agravicmixer influence degree of mixing

Among the figure: 1-35rpm; 2-40rpm; 3-45rpm; 4-50rpm; 5-58rpm

Fig. 2: the incorporation time and the rotating speed of double helical ribbon mixer influence degree of mixing

Among the figure: 1-40rpm; 2-46rpm; 3-54rpm; 4-60rpm; 5-65rpm

Fig. 3: combined type mixing apparatus schematic diagram

The 1-charge door; 2-twin shaft Agravicmixer; The 3-scavenge port; The 4-double helical ribbon mixer; The 5-discharging opening

The specific embodiment

Embodiment 1

Based on embodiment the present invention is described, table 1 is the parameter and the performance of embodiments of the invention and comparative example.

The chemical composition of [table 1] embodiment and comparative example and performance

Sequence number is implemented relatively

Example 1 example 2 examples 3 examples 4 examples 5 examples 6 examples 7 examples 1

Wall polyphenyl 12 000 10 89 12

The body grain

Protect

Temperature perlite 0 80 00 20 000

Material

Material

Group corncob 00 40 00 20 00

Become

Kg pottery sand 000 200 00 50 0

Cement 150 135 145 125 145 140 145 150

Flyash 22 20 21 18 21 20 21 22

Rubber powder 4.5 3.5 4.0 34 4.5 4 4.5

Volume m ³1.33 1.37 1.52 1.21 1.46 1.32 1.38 1.33

The agravic mixing of twin shaft establishes 35 38 41 45 50 54 58 35

Be equipped with rotating speed (rpm)

The agravic mixing apparatus 56 6.5 67 10 80 of twin shaft

Cementing agent is done time in advance and (is divided

Clock)

The agravic mixing of twin shaft establishes 23 2.5 4 3.5 3 3.5 6

After adding aglite fully,

Continue incorporation time

(minute)

The agravic mixing of twin shaft establishes 67 72 68 85 72 60 76 78

Be equipped with degree of mixing (%)

Two ribbon mixing apparatus change 40 45 50 55 60 62 65

Speed (rpm)

Two ribbon mixing apparatus 1.5 3 2.5 3 2.5 12

Incorporation time (minute)

Two ribbon mixing apparatus 95.4 98.3 96.2 95.2 96.6 96.2 95.7

Degree of mixing (%)

Wall heat insulation material heat conduction 0.048 0.056 0.061 0.066 0.053 0.050 0.059 0.054

Coefficient (W/mK)

At first, choose raw material, carry out weighing respectively, make its batching satisfy the composition of table 1,150 kilograms of cement, 22 kilograms in flyash, 4.5 kilograms of rubber powders, 12 kilograms of granular polystyrenes by table 1 embodiment 1 wall heat insulation material proportioning.At first with cement, flyash, rubber powder drops into twin shaft Agravicmixer 2 by charge door 1, and (manufacturer is the prosperous machinery plant in Zhengding County capital, model: szjx-1000), carry out premixed in 5 minutes, drop into granular polystyrene then, the mixer rotating speed is 35rpm, incorporation time is 2 minutes, degree of mixing reaches 67% after tested, by scavenge port 3 insulation material that has just mixed of the agravic mixing apparatus of twin shaft being entered into two ribbons then mixes and establishes machine 4 (manufacturer is the prosperous machinery plant in Zhengding County capital, model: sljx-1000), the mixer rotating speed is 40rpm, incorporation time is 2 minutes, mixture homogeneity reaches 95.4% after tested, then by discharging opening 5 dischargings, forms one pack system wall heat insulation material in bulk, adopt packaging bags, the supply building energy conservation uses, and through on-the-spot wall heat insulation material thermal conductivity factor test, its result is 0.048W/mK.

Comparative example 1 adopts embodiment 1 same raw material and composition, it only adopts the twin shaft Agravicmixer, and (manufacturer is the prosperous machinery plant in Zhengding County capital, model: mix szjx-1000), the mixer rotating speed is 35rpm, incorporation time 6 minutes, measuring its degree of mixing is 78%, after the supply building energy conservation uses, finds that construction effect is bad, only have embodiment 1 efficient 70%, have a strong impact on efficiency of construction, and through on-the-spot wall heat insulation material thermal conductivity factor test, its result is 0.054W/mK.Found that its mixture homogeneity and insulation material thermal conductivity factor all have big gap than embodiment 1.

The mixing uniformity measuring method is for adopting mixture homogeneity (abbreviation degree of mixing) statistic law of generally using in the world, i.e. mixture homogeneity=1-coefficient of variation.Mixture homogeneity is big more, and the coefficient of variation bright mixing quality of novel more is good more.

Mixture homogeneity (the degree of mixing)=1-coefficient of variation

The coefficient of variation $C_v=\frac{\mathrm{\σ}}{\stackrel{\‾}{x}}$

X in the formula---mean value in the component

$\stackrel{\‾}{x}=\frac{x_1+x_2+\·\·\·+x_n}{n}$

X in the formula ₁, x ₂, x ₃X _n---the content in this component sample

Standard deviation $\mathrm{\σ}={\left[\frac{1}{n-1}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{(x_i-\stackrel{\‾}{x})}^2\right]}^{\frac{1}{2}}$

The mixed process of material is a random process.Because the qualitative difference of different material, this mixing can only reach a kind of state that is called as incomplete mixing.This admixture is not unique, has uncertainty.These characteristics have determined the evaluation of degree that solid material is mixed only not judge with the uniformity of a sample, and will use the method for statistics, and the degree of mixing evaluation method that the present invention adopts is the crystal violet method, and it is national standard method GB/T5918-1997.

Wall heat insulation material thermal conductivity measurement method is 6 in the wall heat insulation material in situ preparation sample that will mix, block size 300 * 300mm, thickness 30～40mm, picked at random makes up in twos, measure at the plate heat conduction coefficient measuring instrument, three groups of data are average, be the wall heat insulation material thermal conductivity factor.

Embodiment 2-7

With embodiment 1 step, parameter is pressed table 1 and is carried out, and the results are shown in Table 1.

Claims (3)

1, a kind of preparation method of wall heat insulating material is characterized in that, may further comprise the steps:

1) cementing agent is put in the agravic mixing apparatus of twin shaft and carried out premixed, incorporation time 5～10 minutes;

2) aglite is dropped into the agravic mixing apparatus of above-mentioned twin shaft, aglite and cementing agent volume ratio are that 10～15:1 forms compound, and rotating speed is 35～58rpm, and incorporation time is 2～4 minutes;

3) open the scavenge port of the agravic mixing apparatus of twin shaft, compound enters into two ribbon mixing apparatus, and rotating speed is 40～65rpm, and incorporation time is 1～3 minute.

2, preparation method according to claim 1 is characterized in that:

Described cementing agent is cement, flyash and rubber powder.

3, preparation method according to claim 1 is characterized in that:

Described aglite be granular polystyrene, perlite, corncob, pottery sand one of or two kinds.

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