CN100357365C - Process for preparing high infrared radiance energy saving paint - Google Patents

Abstract

The present invention relates to a preparation method for energy-saving paint with low cost and high infrared radiance, which belongs to the technical field of preparation techniques for inorganic metal oxide paint. The preparation method of the present invention comprises the following steps: 40 to 60 wt% of superfine SiO2 powder, 20 to 40 wt% of industrial pure Fe2O3, 5 to 15 wt% of industrial pure Cr2O3 and 5 to 15 wt% of industrial pure MnO2 are used as raw materials, wherein the SiO2 is a byproduct generated by ferro-silicon alloy, and all components are used as raw materials for the first time; the raw materials are mixed and ground in a ball mill, then are sintered at 1100 to 1200DEGC in a sintering furnace and are processed in a ball-milling mode to be prepared into base powder; a paint adhesive prepared in advance is added in the base powder, wherein the adhesive is prepared from Mg(OH)2, H3PO4, NaOH and water by water dissolving and heating; the weight compounding ratio of the base power to the adhesive is 1:1, the obtained mixture is uniformly stirred, and finally, the energy-saving paint with high infrared radiance is prepared. The energy-saving paint with high infrared radiance, which is prepared by the method of the present invention, has the whole wavelength integral radiance of 0.90 at the room temperature, and specific radiance at the normal direction in each wavelength range is at least 0.90.

Description

The preparation method of high infrared radiance energy saving paint

Technical field

The present invention relates to a kind of preparation method of high infrared radiation energy-saving coatings, belong to inorganic, metal oxide coating manufacture process technical field.

Background technology

The ir radiation energy-saving coatings is as a kind of energy-conservation novel material on the heat-processing equipments such as industrial furnace; not only can obtain the effect of energy-conservation reduction fuel cost; and can play a good protection to furnace lining material, prolong industrial furnace work-ing life, alleviate the kiln maintenance workload.In addition, strengthen radiative transfer in the stove, improve heating uniformity, improve furnace thermal efficiency and control of industrial furnace home.

In the world, developed country has carried out a large amount of research to ir radiation energy-saving coatings and the application on industrial furnace thereof.For example, in the refining of petroleum industry of Japan, existing many enterprises have used the ir radiation energy-saving coatings on the oil process furnace, make thermal efficiency of heating furnace improve 2～4%; The ir radiation energy-saving coatings that U.S. company produces uses on industrial furnace, can save energy 10～30%, and the ir radiation energy-saving coatings also has provide protection to furnace lining material simultaneously, can prolong 1～4 times of refractory materials work-ing life.For the research of ir radiation energy-saving coatings, the starting material of the ir radiation energy-saving coatings of at present external better performances adopt the multicomponent system of higher oxygenatedchemicals, nitride, carbide or boride of radiant ratio.By contrast, because the oxide compound price is relatively low, good stability in oxidizing atmosphere and gaining great popularity.For example, the ET-4 series ir radiation energy-saving coatings of Britain company production adopts SiO ₂, ZrO ₂, Al2O3, Japan certain company adopted CoO, Cr ₂O ₃, Fe ₂O ₃, Mo ₂O ₃, SiO ₂As main raw material.

Also there is bibliographical information on industrial furnace, to use the actual energy-saving effect of ir radiation energy-saving coatings in China.When the ir radiation energy-saving coatings is used, begin to only limit to resistance furnace on industrial furnace, be developed to afterwards and be applied on the hot industry process furnace less than 600 ℃.In late 1980s, the ir radiation energy-saving coatings is used in some petroleum chemical industries of China and steel industry, and obtains certain effect.

Find that in a large amount of research when development ir radiation energy-saving coatings, the infrared emittance that improves its each wavelength region is the key of development.It is compound at first can to adopt the little material of absorptive index and specific refraction to carry out, and these materials itself have bigger infrared emittance; Next is an infrared radiation coating granularity super-refinement, and super-refinement can further reduce the absorptive index and the specific refraction of material.Simultaneously, requiring has the reasonable component proportioning, makes the ir radiation energy-saving coatings in whole infrared emanation wavelength region may very high radiance be arranged all.

Summary of the invention

The preparation method who the purpose of this invention is to provide a kind of low-cost high infrared radiance energy saving paint.

The preparation method of a kind of high infrared radiance energy saving paint of the present invention is characterized in that having following technological process and step:

A. set the composition and the weight percent proportioning thereof of the oxide raw material of coating, its prescription is as follows:

SiO ₂Ultra-fine micropowder 40～60%,

Technical pure Fe ₂O ₃20～40%,

Technical pure Cr ₂O ₃5～15%,

Technical pure MnO ₂5～15%;

SiO wherein ₂Ultra-fine micropowder is from the byproduct that produces in the ferro-silicon factory production process, SiO ₂The chemical ingredients and the weight percentage thereof of ultra-fine micropowder are as follows:

SiO ₂ ＞ 85％：

Fe ₂O ₃ ＜ 3％：

MgO ＜ 3％；

Other oxide compounds and impurity surplus,＜9%; The micro mist size range is 100～450nm;

B. prepare the paint adhesion agent: the chemical ingredients of paint adhesion agent and weight percent proportioning thereof are as follows:

Mg(OH) ₂ 3～7％，

H ₃PO ₄ 7～12％，

NaOH 1～5％，

Water 70～90%; More than each component content sum be 100%;

Earlier with raw material Mg (OH) ₂Add suitable quantity of water, make its dispersion, add H subsequently ₃PO ₄, heating in water bath to 85～95 ℃ make its reaction, add NaOH again and disperse, and are cooled to room temperature then, and are standby;

C. the matrix powder for preparing coating: the prescription of the oxide raw material of coating is prepared burden among a set by step; Admixtion is positioned in the ball mill and mixes, grinds, powder is milled to below the 300 mesh screen residue 0.5wt%, send into sintering oven and carry out sintering, sintering temperature is 1100～1200 ℃, sintering time 1～2 hour is cooled to room temperature then in air, be positioned over to carry out ball milling in the ball mill again, powder is ground to below the 300 mesh screen residue 0.5wt%, makes standby matrix powder;

D. prepare energy-saving coatings: in above-mentioned matrix powder, add the good paint adhesion agent of prepared beforehand, the weight proportion of matrix powder and binding agent is 1: 1, putting into machine mixer subsequently stirs, churning time is 20～30 minutes, finally makes the energy-saving coatings with high infrared radiance.

The inventive method is byproduct---the SiO that has adopted in the ferro-silicon production process ₂Ultra-fine micropowder is as main component, and this is to SiO ₂The recycling of ultra-fine micropowder, and environment protection also played a role.Adopt commercially pure Fe in the inventive method ₂O ₃, Cr ₂O ₃, MnO ₂Be raw material, after high temperature sintering is handled, formed Si in the coating ⁴⁺, Fe ³⁺, Cr ⁴⁺Intermingle each other, increased impurity level, so can improve infrared emittance.

The ir radiation energy-saving coatings that the inventive method makes, the long integrated emissivity of its room temperature all-wave is 0.90, each wavelength region normal direction emissivity is all more than or equal to 0.90.

Embodiment

After now specific embodiments of the invention being described in.

Embodiment 1

The preparation process and the step of present embodiment are as follows:

(1) composition and the weight percent proportioning thereof of setting coating oxide raw material, its prescription is as follows:

SiO ₂Ultra-fine micropowder 50%,

Technical pure Fe ₂O ₃30%,

Technical pure Cr ₂O ₃10%,

Technical pure MnO ₂10%;

SiO wherein ₂The chemical ingredients of ultra-fine micropowder and weight percentage are:

SiO ₂ 87.6％，

Fe ₂O ₃ 1.32％，

MgO 2.11％，

Other oxide compounds and impurity surplus,＜9%;

The median size of micro mist is 233nm, and the distribution range of micro mist granularity is 130～415nm.

(2) preparation paint adhesion agent: the chemical ingredients of paint adhesion agent and weight percent proportioning thereof are as follows:

Mg(OH) ₂ 5.8％，

H ₃PO ₄ 9.7％，

NaOH 3％，

Water 81.5%;

Earlier with raw material Mg (OH) ₂Add quantitative water, make its dispersion, add H subsequently ₃PO ₄, heating in water bath to 90 ℃ makes its reaction, adds NaOH again and disperses, and is cooled to room temperature then, and is standby.

(3) matrix powder of preparation coating: the prescription by above-mentioned coating is prepared burden; Admixtion is positioned in the ball mill and mixes, grinds, powder is milled to below the 300 mesh screen residue 0.5wt%, send into sintering oven and carry out sintering, sintering temperature is 1150 ℃, sintering time 1.5 hours is cooled to room temperature then in air, be positioned over to carry out ball milling in the ball mill again, powder is ground to below the 300 mesh screen residue 0.5wt%, makes standby matrix powder.

(4) preparation energy-saving coatings: in above-mentioned matrix powder, add aforesaid paint adhesion agent, the weight proportion of matrix powder and binding agent is 1: 1, put into machine mixer subsequently and stir, churning time is 25 minutes, finally makes the energy-saving coatings with high infrared radiance.

The sample of present embodiment preparation is through performance test analysis, and the long integrated emissivity of its room temperature all-wave is 0.90, and each wavelength region normal direction emissivity is all more than or equal to 0.90.

The data that each its each wavelength region records are as follows:

F1-total length ripple integrated emissivity, 0.90

F2-(8～25) μ m integrated emissivity, 0.90

F3-8.45 μ m normal direction emissivity, 0.90

F4-9.50 μ m normal direction emissivity, 0.90

F5-10.60 μ m normal direction emissivity, 0.90

F6-12.00 μ m normal direction emissivity, 0.91

F7-13.50 μ m normal direction emissivity, 0.91

F8-(14～25) μ m integrated emissivity, 0.91

Claims (1)

1. the preparation method of a high infrared radiance energy saving paint is characterized in that having following technological process and step:

A. set the composition and the weight percent proportioning thereof of the oxide raw material of coating, its prescription is as follows:

SiO ₂Ultra-fine micropowder 40～60%,

Technical pure Fe ₂O ₃20～40%,

Technical pure Cr ₂O ₃5～15%,

Technical pure MnO ₂5～15%;

SiO wherein ₂Ultra-fine micropowder is from the byproduct that produces in the ferro-silicon factory production process, SiO ₂The chemical ingredients and the weight percentage thereof of ultra-fine micropowder are as follows:

SiO ₂ ＞85％，

Fe ₂O ₃ ＜3％，

MgO ＜3％，

Other oxide compounds and impurity surplus,＜9%,

The micro mist size range is 100～450nm;

B. prepare the paint adhesion agent: the chemical ingredients of paint adhesion agent and weight percent proportioning thereof are as follows:

Mg(OH) ₂ 3～7％，

H ₃PO ₄ 7～12％，

NaOH 1～5％，

Water 70～90%;

More than each component content sum be 100%;

Earlier with raw material Mg (OH) ₂Add suitable quantity of water, make its dispersion, add H subsequently ₃PO ₄, heating in water bath to 85～95 ℃ make its reaction, add NaOH again and disperse, and are cooled to room temperature then, and are standby;

C. the matrix powder for preparing coating: the prescription of the oxide raw material of coating is prepared burden among a set by step; Admixtion is positioned in the ball mill and mixes, grinds, powder is milled to below the 300 mesh screen residue 0.5wt%, send into sintering oven and carry out sintering, sintering temperature is 1100～1200 ℃, sintering time 1～2 hour is cooled to room temperature then in air, be positioned over to carry out ball milling in the ball mill again, powder is ground to below the 300 mesh screen residue 0.5wt%, makes standby matrix powder;

D. prepare energy-saving coatings: in above-mentioned matrix powder, add the good paint adhesion agent of prepared beforehand, the weight proportion of matrix powder and binding agent is 1: 1, putting into machine mixer subsequently stirs, churning time is 20～30 minutes, finally makes the energy-saving coatings with high infrared radiance.