CN112680116A - Inorganic heat-insulating adhesive and preparation method thereof - Google Patents
Inorganic heat-insulating adhesive and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an inorganic heat-insulating adhesive and a preparation method thereof, belonging to the field of inorganic heat-insulating adhesives. The composite material consists of the following raw materials in percentage by weight: 10-30% w of fiber filler, 5-30% w of porous filler, 1-20% w of hard filler, 2.7-10% w of rheological filler, 0.3-1% w of rheological additive, 0.7-1.2% w of mildew-proof bactericide, 0.3% w of antifreezing agent, 1-5% w of film-forming additive and 30-40% w of water. The advantages are that it is an all inorganic product, the cured product is light and fluffy, it can be used for bonding heat insulating material and metal material, the fiber structure has good anti-cracking effect, long-acting mildew-proof performance, large specific surface area, and is beneficial to the attachment of mildew-proof bactericide.
Description
Technical Field
The invention belongs to the field of inorganic heat-insulating adhesives, and particularly relates to an inorganic heat-insulating adhesive taking mineral fibers and microbeads as main raw materials and a preparation method thereof.
Background
The traditional inorganic heat-insulating material is mostly applied to the traditional building industry, is used as mortar, a heat-insulating plate or a filling material, and is slowly developed.
The reaction type inorganic heat-insulating material mainly has two main types: one is a semi-inorganic material prepared by adding organic emulsion and rubber powder, and the other is a pure inorganic heat-insulating material added with hydraulic materials such as cement or silicate.
The semi-inorganic heat-insulating material is poor in environmental protection and fire resistance, the addition amount of the emulsion and the rubber powder has direct influence on the strength, when the addition amount is small, the product strength is very low, and when the addition amount is large, the fire resistance and the environmental protection performance of the product are poor. The filler used by the heat insulation material generally has strong water and oil absorption, and a large amount of rubber powder and emulsion needs to be added to ensure that the product cannot be loosened.
The pure inorganic heat-insulating material is difficult to be stored for a long time in a wet state because the components contain hydraulic materials and are easy to react and solidify with water; and the pure inorganic heat-insulating material is strong in alkalinity, and is easy to generate electrochemical corrosion on a metal structure.
Disclosure of Invention
The invention provides an inorganic heat-insulating adhesive and a preparation method thereof, and aims to solve the problems that the traditional reaction type heat-insulating material is poor in environmental protection and fire resistance, cannot be stored for a long time in a wet state, and generates electrochemical corrosion on a metal structure.
The technical scheme adopted by the invention is as follows: the composite material consists of the following raw materials in percentage by weight: 10-30% w of fiber filler, 5-30% w of porous filler, 1-20% w of hard filler, 2.7-10% w of rheological filler, 0.3-1% w of rheological additive, 0.7-1.2% w of mildew-proof bactericide, 0.3% w of antifreezing agent, 1-5% w of film-forming additive and 30-40% w of water.
The fibrous filler is at least one of inorganic fibers, fiber fluff and a fibrous material prepared by binding inorganic mineral powder with an organic material.
The porous filler is at least one of perlite, diatomite and glass beads.
The hard filler is at least one of wollastonite, fly ash, kaolin, heavy calcium and light calcium.
The rheological filler is powder with rheological property or a mixture of several kinds of powder with influence on the rheological property of a system, and comprises at least one of bentonite, attapulgite and montmorillonite.
The rheological additive is a leveling agent and a thickening agent or a mixture of the leveling agent and the thickening agent.
The mildew-proof bactericide is an in-tank antiseptic and dry film mildew-proof auxiliary agent, and comprises a mildew-proof bactericide containing BIT and MIT.
The antifreeze is an alcohol ester adjuvant capable of lowering the freezing point of the solution, including but not limited to propylene glycol.
The film-forming auxiliary agent refers to a volatile alcohol ester film-forming auxiliary agent.
A preparation method of an inorganic heat-preservation adhesive comprises the following steps:
(1) mixing the porous filler, the hard filler and the rheological filler in powder according to the proportion of the raw materials, wherein the mixing equipment adopts fiber dry powder stirring equipment, and the mixing is carried out for 5-20 minutes;
(2) uniformly mixing a rheological additive, a mildew-proof bactericide, a film-forming additive, an antifreezing agent and water;
(3) and (3) further mixing the fibrous filler and the mixture obtained in the step (a) according to a proportion, mixing and stirring for 10-15 minutes, and scattering and uniformly distributing the fibers.
Positive effects of the invention
1. The inorganic heat-insulating adhesive provided by the invention belongs to an all-inorganic product, does not react with water, does not contain materials such as cement and the like, is harmless to the environment, and the selected fibrous filler, porous filler and hard filler are inorganic components, wherein the fibrous filler and the porous material have good heat-insulating effect, and the adhesive has excellent overall fireproof, high-temperature resistant and environmental-friendly properties. It can be used as heat insulating material directly, and also can be used for bonding heat insulating material with cold-proof material between metal car body and wall body. The adhesive can be stored for a long time in a wet state, powder and liquid do not need to be mixed before construction, construction can be directly carried out, construction is convenient and fast, and the adhesive is light and fluffy after curing and can be used for bonding heat-insulating materials and metal materials. It is suitable for the adhesion of heat-insulating and cold-proof materials of car bodies, building external walls and mechanical equipment.
2. The inorganic heat-insulating adhesive provided by the invention is composed of a main body made of fiber materials and porous materials, is light and porous after being completely dried, has a good anti-cracking effect due to a fiber structure, is excellent in heat-insulating property and is very suitable for the rail transit industry.
Name (R) | Cork (for construction) | Inorganic adhesive | Neoprene (PCP) | Certain silica gel | Glue with certain structure |
Thermal conductivity (25 ℃ C.) | 0.13 | 0.11 | 0.23 | 0.35 | 0.25 |
Bulk density (kg/m)3) | 500 | 400 | 1240 | 1200 | 1150 |
The inorganic adhesive is the inorganic heat-preservation adhesive provided by the invention, the cork is a heat-insulation material for certain brand of buildings, and the neoprene adhesive, the silica gel and the structural adhesive are common adhesives.
3. The inorganic heat-insulating adhesive provided by the invention has long-acting mildew-proof performance, does not contain organic matters which are easy to mildew, is enhanced in mildew-proof performance when being matched with a mildew-proof bactericide for use, does not mildew, and can protect a bonded cold-proof material. The particle size coverage of the fiber filler, the porous filler and the hard filler is wide, a special loose porous multi-face structure is formed after full mixing, the specific surface area is large, and the attachment of the mildew-proof bactericide is facilitated. The general wall mildew-proof system is usually caused by the loss of the mildew-proof bactericide due to long-term friction and washing, and finally fails, and the porous multi-surface structure of the adhesive slows down the loss speed of the mildew-proof bactericide, thereby achieving the effect of long-acting mildew prevention.
Detailed Description
Example 1
Weighing 30% of hollow glass micro-beads of 40-100 meshes, 10% of wollastonite of 400 meshes, 5% of fly ash of 100 meshes and 2.7% of attapulgite powder of 40-100 meshes, putting the materials into a powder dispersion machine, and stirring for 10 min;
mixing 10% sepiolite fiber with the above mixture for 10 min;
weighing water 40%, starting a liquid dispersion machine, starting stirring at the speed of 200r/min, weighing hydroxyethyl cellulose with the viscosity of 10 ten thousand 0.3%, slowly adding the hydroxyethyl cellulose into the water, and stirring for 5-10 minutes until no powder particles exist in the liquid, and the liquid is colorless and transparent; weighing 0.3% of propylene glycol and twelve 1% of alcohol ester, slowly adding the propylene glycol and the twelve 1% of alcohol ester into the liquid, uniformly dispersing, and standing the mixed liquid at room temperature for 1 hour until transparent micelles in the liquid are completely dissolved;
weighing 0.3% of Mergal 758 preservative and 0.4% of Troysan 107 mildew inhibitor, adding into the mixed solution, and stirring for 5 min;
starting a liquid dispersion machine, stirring at 400r/min, slowly adding the mixed powder, and fully dispersing the powder under the action of water flow;
the viscosity of the colloid gradually rises along with the addition of the mixed powder, the rotating speed can be gradually increased according to the actual situation, the highest rotating speed is 1500r/min, and the preparation of the inorganic heat-insulating adhesive is finished after the powder and the liquid are completely mixed.
The inorganic heat-preservation adhesive is coated on the rock wool board by a scraper, then the rock wool board is pressed on an aluminum plate, and after 24 hours of curing, the rock wool board cannot fall off, so that the inorganic heat-preservation adhesive is applied to the rock wool boardWhen the rock wool board is removed, the rock wool is found to be broken, the adhesive is used for preparing a sample according to the size specified by ISO845, the volume density of the inorganic heat-preservation adhesive after being cured is tested, and the volume density is tested to be 395kg/m3The thermal conductivity according to GB/T10295 (70 ℃) is 0.11.
Example 2
Weighing 5% of 40 mesh perlite powder, 5% of 400 mesh silica fume, 15% of 100 mesh light calcium and 7.5% of 40-100 mesh bentonite, putting into a powder dispersion machine, and stirring for 10 min;
weighing 30% sepiolite fiber, and mixing with the above mixture for 10 min. (ii) a
Weighing water 30%, starting a liquid dispersion machine, starting stirring at the speed of 200R/min, weighing Ashland 10 million hydroxyethyl cellulose 1%, slowly adding the Ashland 10 million hydroxyethyl cellulose into the water, stirring for 5-10 minutes until no powder particles exist in the liquid, and the liquid is colorless and transparent, weighing glycerol 0.3% and Istman TEXANOL R5% and slowly adding the glycerol and the Istman TEXANOL R5% into the liquid, uniformly dispersing, standing the mixed liquid at room temperature for 1 hour until transparent micelles in the liquid are completely dissolved;
weighing 0.5% of Mergal 758 preservative and 0.7% of Troysan 107 mildew inhibitor, adding into the mixed solution, and stirring for 5 min;
starting a liquid dispersion machine, stirring at 600r/min, slowly adding the mixed powder, and fully dispersing the powder under the action of water flow;
with the addition of the mixed powder, the viscosity of the colloid gradually rises, and the rotating speed can be gradually increased according to the actual situation, wherein the maximum rotating speed is 2000 r/min. After the powder and the liquid are completely mixed, the preparation of the inorganic heat-preservation adhesive is finished;
the inorganic heat-preservation adhesive is coated on the rock wool board by a scraper blade, and then the rock wool board is pressed on an aluminum plate. After 24 hours of curing, the rock wool board can not fall off. At this time, the rock wool board is removed, and the rock wool is found to be broken. Preparing a sample by using the adhesive according to the size specified by ISO845, testing the volume density of the inorganic heat-preservation adhesive after being cured, and measuring the volume density to be 410kg/m3The thermal conductivity was 0.115 according to GB/T10295 (70 ℃ C.).
Example 3
Weighing 20% of 40-mesh hollow glass beads, 1% of 400-mesh silica fume and 7% of 40-100-mesh bentonite, putting into a powder dispersion machine, and stirring for 10 min;
weighing 20% of sepiolite fibers and 5% of alumina fibers, and mixing with the mixture for 10 min;
weighing water 40%, starting a liquid dispersion machine, starting stirring at the speed of 200r/min, weighing Ashland 10 ten thousand hydroxyethyl cellulose 0.5%, slowly adding the water, and stirring for 5-10 minutes until no powder particles exist in the liquid, and the liquid is colorless and transparent; weighing 0.3% of glycerol and 5% of Istmann TEXANOL R, slowly adding into the liquid, dispersing uniformly, and standing the mixed liquid at room temperature for 1 hour until the transparent micelle in the liquid is completely dissolved;
weighing 0.5% of Mergal 758 preservative and 0.7% of Troysan 107 mildew inhibitor, adding into the mixed solution, and stirring for 5 min;
starting a liquid dispersion machine, stirring at 400r/min, slowly adding the mixed powder, and fully dispersing the powder under the action of water flow;
the viscosity of the colloid gradually rises along with the addition of the mixed powder, the rotating speed can be gradually increased according to the actual situation, the highest rotating speed is 1500r/min, and the preparation of the inorganic heat-insulating adhesive is finished after the powder and the liquid are completely mixed.
The inorganic heat-preservation adhesive is coated on the rock wool board by a scraper blade, and then the rock wool board is pressed on an aluminum plate. After 24 hours of curing, the rock wool board can not fall off. At this time, the rock wool board is removed, and the rock wool is found to be broken. Preparing a sample by using the adhesive according to the size specified by ISO845, testing the volume density of the inorganic heat-preservation adhesive after being cured, and testing the volume density to 395kg/m3The thermal conductivity according to GB/T10295 (70 ℃) is 0.10.
Example 4
Weighing 20% of 40-mesh hollow glass beads, 10% of 40-mesh perlite, 5.5% of 400-mesh silica fume and 7% of 40-100-mesh bentonite, putting into a powder dispersion machine, and stirring for 10 min;
weighing 10% of sepiolite fiber, and mixing with the mixture for 10 min;
weighing water 40%, starting a liquid dispersion machine, starting stirring at the speed of 200r/min, weighing Ashland 10 ten thousand hydroxyethyl cellulose 1%, slowly adding the water, and stirring for 5-10 minutes until no powder particles exist in the liquid, and the liquid is colorless and transparent. 0.3% of glycerol and 5% of Texanol R are weighed and slowly added into the liquid to be uniformly dispersed. Standing the mixed liquid at room temperature for 1 hour until the transparent micelle is completely dissolved in the liquid;
weighing 0.5% of Mergal 758 preservative and 0.7% of Troysan 107 mildew inhibitor, adding into the mixed solution, and stirring for 5 min;
starting a liquid dispersion machine, stirring at 300r/min, slowly adding the mixed powder, and fully dispersing the powder under the action of water flow;
the viscosity of the colloid gradually rises along with the addition of the mixed powder, the rotating speed can be gradually increased according to the actual situation, the highest rotating speed is 1000r/min, and the preparation of the inorganic heat-insulating adhesive is finished after the powder and the liquid are completely mixed;
coating the inorganic heat-preservation adhesive on a rock wool board by using a scraper, then pressing the rock wool board on an aluminum board, curing for 24 hours to ensure that the rock wool board cannot fall off, at the moment, taking the rock wool board off to find rock wool broken materials, preparing a sample piece by using the adhesive according to the size specified by ISO845, testing the volume density of the inorganic heat-preservation adhesive after curing, and testing the volume density to be 360kg/m3The thermal conductivity according to GB/T10295 (70 ℃) is 0.09.
Example 5
Weighing 22% of 40-mesh hollow glass microspheres, 3% of 400-mesh silica fume and 10% of 40-100-mesh attapulgite, putting into a powder dispersion machine, and stirring for 10 min;
weighing 25% of sepiolite fibers, and mixing with the mixture for 10 min;
weighing 32.5% of water, starting a liquid dispersion machine, starting stirring at the speed of 200r/min, weighing 0.3% of Ashland 10 ten thousand hydroxyethyl cellulose, 0.15% of active amine solution and 0.55% of alkali swelling thickener, slowly adding the mixture into the water, and stirring for 5-10 minutes until no powder particles exist in the liquid, and the mixture is colorless and transparent; weighing 0.3% of glycerol and 5% of Istmann TEXANOL R, slowly adding into the liquid, and uniformly dispersing; standing the mixed liquid at room temperature for 1 hour until the transparent micelle is completely dissolved in the liquid;
weighing 0.5% of Mergal 758 preservative and 0.7% of Troysan 107 mildew inhibitor, adding into the mixed solution, and stirring for 5 min;
starting a liquid dispersion machine, stirring at the speed of 500r/min, and then slowly adding the mixed powder. Under the action of water flow, the powder is fully dispersed;
with the addition of the mixed powder, the viscosity of the colloid gradually rises, and the rotating speed can be gradually increased according to the actual situation, wherein the highest rotating speed is 1500 r/min. And after the powder and the liquid are completely mixed, the preparation of the inorganic heat-preservation adhesive is finished.
The inorganic heat-preservation adhesive is coated on the rock wool board by a scraper blade, and then the rock wool board is pressed on an aluminum plate. After 24 hours of curing, the rock wool board can not fall off. At this time, the rock wool board is removed, and the rock wool is found to be broken. Preparing a sample by using the adhesive according to the size specified by ISO845, testing the volume density of the inorganic heat-preservation adhesive after being cured, and measuring the volume density to be 390kg/m3The thermal conductivity according to GB/T10295 (70 ℃) is 0.098.
The effects of the present invention will be further described below by way of experimental examples.
And mixing the inorganic heat-preservation adhesive according to a designed formula, standing for 48 hours, and performing an anticorrosion and mildewproof test.
(1) Initial microbial state detection:
the samples were placed at 40 ℃ and taken out at 0 day, 7 days, and 28 days, respectively, to be streaked on TSA and MEA media, after which they were placed in incubators at 30 ℃ and 28 ℃ for 5 days, respectively.
Culture medium:
tryptic Soy Agar (TSA) bacterial culture medium
Malt Extract Agar (MEA) fungus culture medium
(2) Wet mildew resistance
Mildew-proof challenge test method: weighing 20g of prepared sample in a sterile sample, washing a mould slant which is cultured for one week by using physiological saline, filtering and centrifuging, adjusting the concentration of a mould spore solution to (1 +/-0.2) × 106spores/ml, spraying about 0.5ml of the mould spore solution on the surface of the sample, standing at room temperature for 21 days, taking out the sample, observing and streaking the sample on a culture medium plate, and evaluating the result after culturing for one week.
Testing strains: aspergillus niger; aspergillus flavus; chaetomium globosum; paecilomyces variotii Paecilomyces varriensis; penicillium citrinum; trichoderma viride; aureobasidium pullulans; method for testing mildew resistance of dry film of Alternaria alternata (GB/T1741):
inoculating test strain, culturing at 25 deg.C in incubator for one week, placing the prepared sample into wet film preparation mold, compacting wet film (size about 3cm × 3cm), and drying at room temperature for 1 week. The mold spores were eluted with physiological saline and centrifuged by filtration, and the spore suspension concentration was adjusted to (0.8-1.2). times.106 spores/ml. The test sample is subjected to ultraviolet sterilization for about 5min, placed on a plate culture medium (the formula of the culture medium is shown in GB/T1741 new edition), sprayed with about 0.5ml of spore suspension on the surface of the test sample, cultured in an incubator at 25 ℃, and checked for mildew after 28 days.
Testing strains: aspergillus niger; aureobasidium pullulans; aspergillus flavus; chaetomium globosum; paecilomyces variotii Paecilomyces varriensis; penicillium citrinum; trichoderma viride.
(3) Experimental data:
initial microbiological state detection results
Remarking: 1. the pH value of the inorganic heat-insulating adhesive is 8.50, and the pH value of certain brand heat-insulating cotton is 6.89;
2. growth grade assessment:
0: no growth was found;
1: a small number of colonies grow, 1-10;
2: 11-100 colonies grow with medium amount;
3: there were more than 1001 colonies, but the streaked portion was not completely covered therewith;
4: the streaked portion was completely covered by the grown colonies.
And (3) a wet mildew resistance detection result:
serial number | Sample name | 21 days of visual observation | Line drawing results for 21 days |
1 | Inorganic heat-insulating glue | NG | 1 |
2 | Certain brand heat insulation cotton | G | 3 |
Remarking: evaluating the growth grade;
NG, observing the surface without mould growth with naked eyes;
g, observing the growth of the mold on the surface by naked eyes;
0: no growth was found;
1: a small number of colonies grow, 1-10;
2: 11-100 colonies grow with medium amount;
3: there were more than 1001 colonies, but the streaked portion was not completely covered therewith;
4: the streaked portion is covered by the growing colonies.
GB/T1741 Dry film mildew resistance test (New edition inner wall)
Serial number | Sample name | GB/T 1741 |
1 | Inorganic heat-insulating glue | 0 |
2 | Certain brand heat insulation cotton | 3 |
Remarking: evaluating the growth grade;
grade 0: no significant growth under microscope at about 50 times
Grade 1, growth is invisible or difficult to see with the naked eye, but is evident under a magnifying glass (< 10%);
grade 2, the growth is obviously seen by naked eyes, and the coverage area on the surface of the sample is 10 to 30 percent;
grade 3, the growth is obviously seen by naked eyes, and the coverage area on the surface of the sample is 30-60 percent;
grade 4, the growth is obviously seen by naked eyes, and the coverage area on the surface of the sample is more than 60 percent; while the negative control sample should not be observed visually for growth.
Claims (10)
1. An inorganic heat-insulating adhesive is characterized by comprising the following raw materials in percentage by weight: 10-30% w of fiber filler, 5-30% w of porous filler, 1-20% w of hard filler, 2.7-10% w of rheological filler, 0.3-1% w of rheological additive, 0.7-1.2% w of mildew-proof bactericide, 0.3% w of antifreezing agent, 1-5% w of film-forming additive and 30-40% w of water.
2. The inorganic heat-insulating adhesive as claimed in claim 1, wherein: the fibrous filler is at least one of inorganic fibers, fiber fluff and a fibrous material prepared by binding inorganic mineral powder with an organic material.
3. The inorganic heat-insulating adhesive as claimed in claim 1, wherein: the porous filler is at least one of perlite, diatomite and glass beads.
4. The inorganic heat-insulating adhesive as claimed in claim 1, wherein: the hard filler is at least one of wollastonite, fly ash, kaolin, heavy calcium and light calcium.
5. The inorganic heat-insulating adhesive as claimed in claim 1, wherein: the rheological filler is powder with rheological property or a mixture of several kinds of powder with influence on the rheological property of a system, and comprises at least one of bentonite, attapulgite and montmorillonite.
6. The inorganic heat-insulating adhesive as claimed in claim 1, wherein: the rheological additive is a leveling agent and a thickening agent or a mixture of the leveling agent and the thickening agent.
7. The inorganic heat-insulating adhesive as claimed in claim 1, wherein: the mildew-proof bactericide is an in-tank antiseptic and dry film mildew-proof auxiliary agent, and comprises a mildew-proof bactericide containing BIT and MIT.
8. The inorganic heat-insulating adhesive as claimed in claim 1, wherein: the antifreeze is an alcohol ester adjuvant capable of lowering the freezing point of the solution, including but not limited to propylene glycol.
9. The inorganic heat-insulating adhesive as claimed in claim 1, wherein: the film-forming auxiliary agent refers to a volatile alcohol ester film-forming auxiliary agent.
10. A method for preparing the inorganic heat-insulating adhesive according to any one of claims 1 to 9, comprising the following steps:
(1) mixing the porous filler, the hard filler and the rheological filler in powder according to the proportion of the raw materials, wherein the mixing equipment adopts fiber dry powder stirring equipment, and the mixing is carried out for 5-20 minutes;
(2) uniformly mixing a rheological additive, a mildew-proof bactericide, a film-forming additive, an antifreezing agent and water;
(3) and (3) further mixing the fibrous filler and the mixture obtained in the step (a) according to a proportion, mixing and stirring for 10-15 minutes, and scattering and uniformly distributing the fibers.
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CN1115324A (en) * | 1994-07-19 | 1996-01-24 | 杜唯 | Light weight asbestos-free high temp. resistance and heat insulation paint |
CN101085892A (en) * | 2007-05-31 | 2007-12-12 | 广州秀珀化工有限公司 | Thin and thermal insulation inner wall paint, preparation method and construction method thereof |
CN101348630A (en) * | 2008-09-17 | 2009-01-21 | 中国建筑材料科学研究总院 | Mildewproof dew resisting coating and preparation thereof |
EP2871169A1 (en) * | 2013-11-08 | 2015-05-13 | Daw Se | Dispersion composition, plaster layer system and thermal insulation compound system |
CN111393881A (en) * | 2020-05-06 | 2020-07-10 | 国鼎(苏州)材料科技有限公司 | All-inorganic interior and exterior wall coating and preparation method thereof |
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2020
- 2020-12-23 CN CN202011543347.2A patent/CN112680116A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1115324A (en) * | 1994-07-19 | 1996-01-24 | 杜唯 | Light weight asbestos-free high temp. resistance and heat insulation paint |
CN101085892A (en) * | 2007-05-31 | 2007-12-12 | 广州秀珀化工有限公司 | Thin and thermal insulation inner wall paint, preparation method and construction method thereof |
CN101348630A (en) * | 2008-09-17 | 2009-01-21 | 中国建筑材料科学研究总院 | Mildewproof dew resisting coating and preparation thereof |
EP2871169A1 (en) * | 2013-11-08 | 2015-05-13 | Daw Se | Dispersion composition, plaster layer system and thermal insulation compound system |
CN111393881A (en) * | 2020-05-06 | 2020-07-10 | 国鼎(苏州)材料科技有限公司 | All-inorganic interior and exterior wall coating and preparation method thereof |
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Application publication date: 20210420 |