CN1106051A - Heat-insulation coating and its manufacturing method - Google Patents

Abstract

The new heat-insulating paint for thermodynamic apparatuses, whose medium temp. is less than 800 deg.C is prepared with pulpy material, light filler, adhesive, active substance, chemical assistant and water through selection of raw materials, proportioning and optimizing technological process, and features high heat-insulating nature, adhesion and binding strength, simple method, and low cost.

Description

Heat-insulation coating and its manufacturing method

The present invention relates to compound heat insulation coating of a kind of all kinds heat power equipment when being used for medium temperature and being lower than 800 ℃ and preparation method thereof, belong to field of heat insulating materials.

The lagging material that uses both at home and abroad has two big classes at present.One class is traditional lagging material: as asbestos plate, rope, diatomite brick, piece, pearlstone and expanded vermiculite product, the fine cotton felt of silicon, three cottons (rock wool, mineral wool, glass fibre cotton) felt heat insulating products, above-mentioned these heat insulating products (section bar) all exist a common weakness, when being applied to (especially strange, different, special type) on all kinds of heat power equipments, must carry out colligation, looping, construction trouble, and exist gaping of joints, thermosteresis bigger; Another kind of thermal insulation coatings for beginning to develop before and after the nineties.Because this coating can be coated on (especially strange, different, special type) on the heat power equipment flawlessly, in thermal insulation layer, do not exist gaping of joints, thermosteresis little, heat-insulating property has by a relatively large margin raising than first kind material.So this in recent years thermal insulation coatings development makes much progress.Yet remain in following problem according to seeing in the patent of announcing and applying for:

(1) consumption of asbestos is big, and routine CN87102864A has announced a kind of complex silicate heat-insulation and heat-preservation material, and wherein the asbestos consumption accounts for raw-material weight ratio above 50%, so the asbestos consumption is big, the cost height.

(2) in the production technique, need adopt hot-water soak or soak at room temperature technology, and slurry also must carry out froth breaking after making to becoming pulp material.Example CN1076921A has announced a kind of inorganic composite heat insulation material and manufacture craft, must be to becoming pulp material to soak 24 hours in normal temperature.Cause like this production cycle long, cost is high.

(3) do not add active substance in the composition, heat-insulating property is undesirable.Example CN1067667A has announced a kind of manufacture method of heat insulating coatings, though adopt not soaking technology in the method, owing to do not add any active substance, the heat-insulating property of this product is unsatisfactory.Among the embodiment 1 as this application, this coating is coated on the electrothermal water boiling kettle outside surface, the coating mean thickness is 4mm, and water-in-kettle is boiled, when temperature reach stable after, the coating surface temperature is 45 ℃.

Be 92105407.6 the serial composite heat-insulating coating of production method (the FBT(rare earth that promptly many at home families transfer the possession of) according to up-to-date report number of patent application by a kind of composite heat insulation coating of the open-minded power-saving technology in Xi'an development company exploitation) its performance index through hard insulating material product quality supervision inspection center of State Bureau of Building Materials Industry the detection on February 15th, 92: ρ _Wet=926Kg/m ₃, ρ _Do=203Kg/m ₃, cohesive force=1080N, thermal conductivity is 0.11W/mK in the time of 350 ℃, though added the active substance rare earth in this product, how many performances do not improve.

Therefore the purpose of this invention is to provide a kind of compound heat insulation coating and preparation method thereof, this compound heat insulation coating has better heat preservation and insulation, and making method is simple, need not soak at room temperature and froth breaking, and production cost is low, the cycle is short.

The object of the present invention is achieved like this.

The invention provides a kind of compound heat insulation coating and preparation method thereof.

Compound heat insulation coating of the present invention is made up of compositions such as becoming pulp material, light filler, binding agent, active substance, chemical assistant and water, and its each composition scope is:

Become pulp material: 8～14%(weight)

Light filler: 4～8%(weight)

Binding agent: 2～5%(weight)

Active substance: 0.1～0.4%(weight)

Chemical assistant: 0.8～1.5%(weight)

Water: 70～90%(weight)

Wherein active substance adopts active aluminum, and chemical assistant comprises bleeding material carboxymethyl cellulose, the fast T of permeate agent, pore forming material 831A, defoamer 831B.The composition scope of four kinds of chemical assistants is: bleeding material carboxymethyl cellulose: 0.15～0.25%

The fast T:0.40 of permeate agent～0.60%

Pore forming material 831A:0.15～0.45%

Defoamer 831B:0.15～0.45%

The making method of compound heat insulation coating involved in the present invention is:

1. one-tenth pulp material selected, grating is dropped into charging basket in batches mix and add the fast T of permeate agent with water, and carry out the high speed making beating with 1000～1350 rev/mins speed;

2. in said mixture, drop into into pulp material more successively, the active substance active aluminum, bleeding material carboxymethyl cellulose, the fast T of permeate agent, binding agent, pore forming material 831A continues to carry out the high speed making beating with 1000～1350 rev/mins speed;

3. selected light filler and above-mentioned slurry are added agitation vat, said mixture is carried out stirring at low speed with 30～60 rev/mins rotating speeds;

4. the rotating speed that adds defoamer 831B in said mixture and continue with 30～60 rev/mins carries out stirring at low speed to said mixture, makes compound heat insulation coating provided by the present invention;

5. 1. above-mentioned～2. in, high speed beating time scope is 5～20 minutes/time; 3. above-mentioned～4. in, the stirring at low speed time range is 5～10 minutes/time.

The effect of adding active aluminum in compound heat insulation coating of the present invention is the reflectivity that increases coating, reduce the radiation heat exchange amount, raising is to becoming the cracking and the dispersive ability of pulp material, in order to the heat-insulating property that improves coating, cohesive force with to the sticking power of insulation layer; The effect of adding bleeding material carboxymethyl cellulose is the bleeding that increases coating; Fast T can be accelerated into the cracking and the dispersive ability of pulp material as permeate agent; 831A forms the micro-bubble of high dispersing as pore forming material with it, reduces the ρ of coating _WetValue and ρ _DoValue; 831B is as defoamer, in order to the ρ that regulates coating _WetValue.Adopt making beating at a high speed in making method of the present invention, purpose is to improve into the cracking and the dispersive ability of pulp material with mechanical means, in order to adopting normal temperature not have soaking technology; Adopt stirring at low speed, in order to froth breaking control ρ _WetThe size of value.

Adopt the key technical indexes of the compound heat insulation coating that essentially consist provided by the present invention and method make as follows:

ρ _WetValue :≤830Kg/m ³

ρ _DoValue :≤180Kg/m ³

λ _{In the time of 20 ℃}:≤0.055W/mK,

λ _{In the time of 350 ℃}:≤0.1W/mK,

Do solid shrinking percentage: 5～10%

Cohesive force: 〉=1300N

σ _Draw: 0.09～0.12MPa

σ _Cut: 0.03～0.04MPa

Shock resistance: the electromagnetic vibration test platform does not have cracking, comes off under 80Hz, 2g, 1h.

Sound absorbing coefficient: acoustic absorptivity was 35～40% when thickness was 30～80mm, 250～400Hz.

Applicable temperature scope :-30～+ 800 ℃.

With above technical indicator and application number is that the technical indicator that 92105407.6 application for a patent for invention reaches is compared, compound heat insulation coating good heat insulating of the present invention, strong adhesion, on making method, need not soak at room temperature and de-foaming process, product with short production cycle, cost is low.

In addition since the present invention its composition and composition have been carried out selecting excellent, grating and have increased

Added active aluminum, chemical assistant, characteristics such as compound heat insulation coating of the present invention also has lightweight, antidetonation, sound insulation, anti-corrosion, anti-flaming, nontoxic, no burn into is pollution-free are a kind of multifunctional heat insulating coating that multiple characteristics are one that collects.

With an embodiment the present invention is further specified below

1, a kind of component of compound heat insulation coating is:

(1) water: 78%

(2) pottery is cotton: 4.2%

(3) asbestos: 2.9% (one-tenth pulp material)

(4) sepiolite: 4.5%

(5) pearlstone: the 5.7%(light filler)

(6) binding agent: 3.3%(concentration is 7.5% polyvinyl alcohol water solution)

(7) active substance: active aluminum 0.25%

(8) bleeding material: carboxymethyl cellulose 0.2%

(9) permeate agent: fast T 0.5%

(10) pore forming material: 831A 0.25% (chemical assistant)

(11) defoamer: 831B 0.2%

2, making method is divided into making beating and stirring at low speed operation at a high speed.

The high speed pulping process:

1. 78% water, 4.2% pottery cotton, 0.2% fast T are dropped into charging basket, carry out the high speed making beating then.Beating rate is 1150 rev/mins, and beating time is 16 minutes;

2. 2.9% asbestos are put in the above-mentioned charging basket, proceeded making beating at a high speed then, beating rate still is 1150 rev/mins, and beating rate still is 1150 rev/mins, and beating time is 12 minutes;

3. with 4.5% sepiolite, 0.25% active aluminum, 0.2% carboxymethyl cellulose and 0.3% fast T drop in the above-mentioned charging basket, proceed making beating at a high speed then.Beating rate still is 1150 rev/mins, and beating time still is 12 minutes;

4. 3.3% binding agent is dropped in the above-mentioned slurry, carry out the high speed making beating then.Beating rate still is 1150 rev/mins, and beating time is 5 minutes;

5. 0.25% 831A is dropped in the above-mentioned slurry, proceed making beating at a high speed then.Beating rate still is 1150 rev/mins, and beating time is 5 minutes;

The stirring at low speed operation

1. with in 5.7% the pearlstone and above-mentioned slurry input stirrer, carry out stirring at low speed then, stirring velocity is 40 rev/mins, and churning time is 10 minutes;

2. 0.2% 831B is put in the above-mentioned mixed slurry, proceed stirring at low speed again, stirring velocity still is 40 rev/mins, and churning time is 5 minutes;

The compound heat insulation coating made from present embodiment has carried out following two kinds of experiments and contrast

Experiment one: the compound heat insulation coating made from present embodiment spreads upon on the electric kettle outside surface, the coating mean thickness is 3.8mm, water-in-kettle is boiled, when temperature reach stable after, surface temperature on the pot lid of no coating is 87.5 ℃, and the kettle wall surface temperature that coating is arranged has only 37 ℃ (envrionment temperature is 21 ℃), surveys every mm coating cooling 13.29%.

Experiment two: as shown in the table

Table can draw to draw a conclusion thus:

1, the made compound heat insulation coating brushing every mm coating on heat power equipment of this example can be lowered the temperature 3.6～5.6 ℃, along with the raising heat insulation and preservation effect of medium temperature is remarkable more.

2, under equal conditions adopt the made compound heat insulation coating executive cost of present embodiment to descend 15～25%, and the loss of the surface heat of heat power equipment can also reduce by 15～30%.

3, improve labor condition (that is: reduced skin temperature), realized safety in production.

Claims (3)

1, a kind of compound heat insulation coating of being made up of compositions such as becoming pulp material, light filler, binding agent, active substance, chemical assistant and water is characterized in that containing active substance, chemical assistant and composition scope and is:

Become pulp material: 8～14% (weight)

Light filler: 4～8% (weight)

Binding agent: 2～5% (weight)

Active substance: 0.1～0.4% (weight)

Chemical assistant: 0.8～1.5% (weight)

Water: 70～90% (weight)

Wherein active substance adopts active aluminum, chemical assistant to comprise four kinds of bleeding material carboxymethyl celluloses, the fast T of permeate agent, pore forming material 831A, defoamer 831B.

2, compound heat insulation coating as claimed in claim 1 is characterized in that, wherein the composition scope of chemical assistant is:

Bleeding material carboxymethyl cellulose: 0.15～0.25%(weight)

The fast T:0.4 of permeate agent～0.6%(weight)

Pore forming material 831A:0.15～0.45%(weight)

Defoamer 831B:0.15～0.45%(weight)

3, the making method of compound heat insulation coating as claimed in claim 1 is characterized in that, adopts continuous high speed making beating and stirring at low speed technology in the making processes:

1. one-tenth pulp material selected, grating is dropped into charging basket in batches mix, add the fast T of permeate agent, and carry out the high speed making beating with 1000～1350 rev/mins speed with water;

2. in said mixture, drop into into pulp material more successively, active aluminum, bleeding material carboxymethyl cellulose, the fast T of permeate agent, binding agent, pore forming material 831A continues to carry out the high speed making beating with 1000～1350 rev/mins speed;

3. selected light filler and above-mentioned slurry are added agitation vat, said mixture is carried out stirring at low speed with 30～60 rev/mins rotating speeds;

4. adding defoamer 831B in said mixture, and the rotating speed that continues with 30～60 rev/mins carries out stirring at low speed to said mixture, makes compound heat insulation coating provided by the present invention;

5. 1. above-mentioned～2. in, high speed beating time scope is 5～20 minutes/time; 3. above-mentioned～4. in, the stirring at low speed time range is 5～10 minutes/time.