CN1579985A - Hydrophobic expanded pearlite for low temperature and its preparing method - Google Patents
Hydrophobic expanded pearlite for low temperature and its preparing method Download PDFInfo
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- CN1579985A CN1579985A CN 200410018499 CN200410018499A CN1579985A CN 1579985 A CN1579985 A CN 1579985A CN 200410018499 CN200410018499 CN 200410018499 CN 200410018499 A CN200410018499 A CN 200410018499A CN 1579985 A CN1579985 A CN 1579985A
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- hydrophobic
- hydrophober
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Abstract
The invention relates to an approach to produce hydrophobic expanded perlite that can be obtained by spreading water-repellent on surface of expanded perlite to form hydrophobic protective membrane. It will get a better effect that using organic fats matters or oil matters, esp., silicone oil as water-repellent. The invention remarkably reduces dosage of water-repellent with adding water to dilute water-repellent and then blending and stirring with expanded perlite. It can reduce technics flow, low production cost and ensure production quality that adopting continuous product and completing spray and dry in one time. The invention can be widely used as thermal insulation in oxygen-making industry, low temperature, insulation equipment and other fields.
Description
Technical field
The invention belongs to Cryo Heat Insulation material technology field, be specifically related to hydrophobic expansion pearlite that a kind of low temperature uses and preparation method thereof.
Background technology
The red-hot melts of spraying and spoiling over from the volcano, all can be called lava through cooling agglomerative product, but also because the cooling of magma ejection ground surface is very fast, so that wherein atom or ion have little time to be combined to form well-regulated crystalline material, solidify and form natural glass substance, the glassy rock of this natural formation, the SiO in its Chemical Composition
2Content＞65% is called acid glassy lava.As perlite, spongiosa rock, obsidian, the general designation perlite.
Perlite through fragmentation, classification, preheating, high temperature moment fuse volumetric expansion 10-25 doubly after, the title pearlstone.Pearlstone is cavernous weave construction, density is little, thermal conductivity is low, fire-resistant and sound absorption qualities good, and nonpoisonous and tasteless, can be widely used in building, metallurgy, electric power, chemical industry, empty branch, liquefied gas, cryogenic insulating and agricultural, landscape flower is made soilless culture, soil improvement agent, farm chemical carrier, foodstuffs industry flocculating aids, animal feedstuff additive etc.But because pearlstone is the opening cell texture, its water-intake rate is according to the water of 4 ~ 9 times of the adsorbable own wts of density size, because the thermal conductivity ratio air of water is big 24 times, be equivalent to increase numerous heat bridges, its thermal conductivity is improved greatly, and its performance of the pearlstone of this new water sees Table 1:
Table 1
| Project | Unit | Performance | Explanation |
| Particle diameter | ????Mm | ????0.15~2 | |
| Density | ????Kg/m 3 | ????70~150 | |
| Thermal conductivity | ????W/m·K | ????0.047~0.058 | |
| Water ratio | ????％ | ????＜2 | |
| Water-intake rate | Doubly | 4 ~ 9 of quality | Saturated water absorption |
| Rate of moisture absorption | ????％ | ????1.8 |
The hydrophilicity major cause of pearlstone is:
1, the specific surface area of pearlstone is very big, is generally 10m
2/ g, according to the Lang Shi adsorption equation:
＝k·s?????????????????????????………………………(1)
In the formula:, adsorptive capacity; K, the constant of certain material; S, surface-area can be found out by (1) formula, and under fixed substance kind condition, the surface-area adsorptive capacity is relevant with its surface-area, and surface-area is big more, and adsorptive capacity is also just big more.Therefore, pearlstone is easy to suction.
2, because pearlstone is micropore hole structure, exist a large amount of micropore holes, the variation that surface tension produces is a capillary phenomenon, make water molecules can be automatically along hole to internal migration, till surface tension generation pressure difference Δ P reached balance, pressure difference can be represented by the formula:
ΔP＝2·f/r??????????????????????….……………………(2)
In the formula: f: surface tension; R: pore radius.
By formula (2) as seen: pore is thin more, and pressure difference is big more, and the ability of the moisture content of suction is also big more.
3, heat of emersion: heat of emersion is the pearlstone surface by infiltration to the wetting heat that discharges, and its numerical value can reflect the variation of solid surface total energy.Heat of emersion is big more, illustrates that the avidity of pearlstone and water is also big more.Because the structural performance of perlite vitreum and water as can be known, after their contacts, can produce the very fast infiltration of big area and speed.
By the water mechanism of above pearlstone as can be known, keep the good insulation effect of pearlstone, key is to prevent the immersion of sealing, solves the hydrophobic problem of pearlstone.
Along with the fast development of China's Iron And Steel Industry, to calendar year 2001 end, China's air separation plant industry is produced cover surplus the large, medium and small type air separation plant 8000,1000m altogether
3Air separation plant 604 covers that/h is above are to China's introduction at the year ends 2004 1000m
3The above air separation plant of/h reaches 134 covers.Baosteel's First-stage Construction is once just used pearlstone 12,000m
3Up to the present, the used pearlstone of oxygenerator all is not hydrophobic, airborne steam can be from relevant slits such as gates, intrusion is in the expansion pearlite thermal insulation layer of-196 ℃ of liquid oxygen apparatuses, because the wetting ability of pearlstone, this can assemble water in air part in a large number, reduces the heat-insulating property of pearlstone, reduce the gas production rate of oxygenerator, increase power consumption.Must periodic stopping production heating, drying time certain or change the exsiccant pearlstone, so both influenced production, also increase factory cost.
Secondly along with the development of China's natural gas liquids (LNG), the temperature of natural gas liquids is-162 ℃, and LNG factory, LNG station, LNG groove ship, LNG gasification station all need a large amount of pearlstones.China introduces 3,000,000 tons of/year natural gas liquids with every year from Australia, 25 years by a definite date, introduces 2,500,000 tons of/year natural gas liquids from Indonesia.
Summary of the invention
The objective of the invention is to propose a kind of pearlstone and preparation method thereof with hydrophobicity performance, with the heat-insulating property of raising pearlstone, thereby adapt to the widespread demand to pearlstone such as growing air separation plant and lng production equipment.
The hydrophobic nature pearlstone that the present invention proposes is by coating hydrophober and the hydrophobic protective membrane that forms is formed in pearlstone and its surface.
Among the present invention, described hydrophobic protective membrane can be an organic fatty class material, can be common oily substance, and the present invention stresses in particular is to adopt organosilicon, i.e. silicone oil and the silicone film that forms.
Silicone oil be a class have multiple viscosity, nontoxic, do not have smell, corrosion-resistant, nonflammable liquid, low viscosity silicone has the hydrophobicity (hydrophobic) of height, can be formed with organic siloxane molecule rete by the silicone oil surface treated, be evenly distributed on the pearlstone micropore wall and can closed channel.Thereby can reduce water-permeable and water-absorbent greatly, and not destroy ventilation property.This specific character makes the aqueous vapor only export but no import, has both helped dehydrating of material, does not influence the heat-insulating property of material again.Its mechanism is that the hydroxyl (0H) on pearlstone surface is active big, can form the hydrogen chain or generate firm hydrophobic film with the reactive bond react with of organic compound end with organo-siloxane, thereby reach the hydrophobic effect.The chemical bond of its rete and the diagram of hydrogen bonded are seen illustrated in figures 1 and 2 respectively.
The preparation technology of the above-mentioned hydrophobic expansion pearlite that the present invention proposes is as follows:
Grope through test of many times, according to emulsification hydrophober water soluble and can very fast dispersion in water, the dissolved characteristic, take the hydrophober thin up, add pearlstone again and mix the operational path that stirs, hydrophober: the weight ratio of water is 1: 5 ~ 15, hydrophober solution: the weight ratio of pearlstone is 0.8-1.4: 1, mix stirring then, drying and dewatering promptly gets required hydrophobic nature pearlstone.With the direct blended technology of hydrophober and pearlstone is compared, the consumption of hydrophober reduces greatly here, hydrophobicity performance is qualified, it is also little that product density changes.
On concrete production line, the present invention adopts continuous processing to prepare the hydrophobic expansion pearlite product.Perlite at the formed product position, directly evenly sprays hydrophober solution to the pearlstone surface by weight proportion in kiln high-temperature melting process, then, drying and dewatering is once finished, and makes hydrophobic expansion pearlite.By hydrophobic expansion pearlite and not hydrophobic pearlstone that the present invention prepares, its performance comparison sees Table 2:
Table 2
| Project | Unit | Performance | Explanation | |
| Hydrophobic not | Hydrophobic type | |||
| Particle diameter | ????mm | ????2~0.15 | ????0.8~0.063 | |
| Density | ????Kg/m 3 | ????70~150 | Less than 65 | |
| Thermal conductivity | ????W/m·K | Normal temperature 0.047 ~ 0.058 | Temperature: 284.6 ~ 77.4K normal pressure: 778mmHg 0.021 | |
| Water ratio | ????％ | ????＜2 | ||
| Rate of moisture absorption | ????％ | ????1.8 | ||
| The hydrophobic rate | ????％ | Hydrophobic not | More than 90% | 500 milliliters of pearlstones, filter the water of collecting＞230 milliliter with 250 ml waters |
The hydrophobic expansion pearlite of the present invention's preparation can be widely used as field high-performance thermal insulation materials such as oxygenerator industry, low temperature heat-preserving equipment.
Oxygenerator industry air separation plant, cryogenic liquid vessel, liquefied oxygen tank vehicle, ethene ice chest etc., all want a large amount of good fluidity (angle of repose 33 ~ 37 degree of pearlstone) other lagging materials the pearlstone that can not replace, as filling heat insulator, to reduce the cold air loss, save energy, pearlstone must periodically be changed pearlstone because of the wet air that bleeds makes moist in refrigeration plant, look back the used thermal insulation material of the developing history in 50 years of empty branch trade, first-generation slag wool, the s-generation is a magnesiumcarbonate, the third generation is the common not hydrophobic pearlstone that uses at present.Though but above these materials all have voidage height, density is little, thermal conductivity is low characteristic, the water-intake rate height, heat-insulating property reduces after suction greatly.
Cyrogenic equipment heat preservation technology another field-162 ℃ natural gas liquids (LNG), it is the Sweet natural gas that exploitation is come out, through dehydration, depickling gas and heavy hydrocarbon, compressed then, expansion forms cryogenic liquid, the LNG Sweet natural gas is a kind of storage and mode of transport of uniqueness, and it has utilization to select the recovery of Sweet natural gas and the storage cost of reduction Sweet natural gas partially.The LNG Sweet natural gas is a very huge industrial chain; Mainly comprise LNG liquefaction plant, LNG receiving terminal, LNG tank car, LNG groove ship, LNG gasification station.Density is little, thermal conductivity is low and the demanding thermal insulation material of hydrophobic all to need a large amount of good fluidities, (be convenient to fill).General common pearlstone can not adopt at all.
Description of drawings
Fig. 1 is that the chemical bond of pearlstone hydrophobic membranous layer is in conjunction with diagram.
Fig. 2 is the hydrogen bonded diagram of pearlstone hydrophobic membranous layer.
Embodiment
The invention is further illustrated by the following examples.
Embodiment 1, hydrophober: water=1: 5 (weight ratio) shape hydrophober solution, hydrophober solution: pearlstone=1: 1 (weight ratio), mixing and stirring, drying and dehydrating is to weight, get pearlstone, its hydrophobic requires to satisfy the used hydrophobic expansion pearlite of groove ship France GTT company technical indicator.Here hydrophober adopts silicone oil.
Embodiment 2, hydrophober: water=1: 7 (weight ratio) forms hydrophober solution, hydrophober solution: pearlstone=1.2: 1 (weight ratio), mixing and stirring, drying and dehydrating reaches weight, hydrophobic expansion pearlite, its hydrophobic index can surpass the hydrophobic technical indicator that French GTT company is proposed.Here hydrophober adopts silicone oil, perhaps is organic fatty class material.
Embodiment 3, hydrophober: water=1: 15 (weight ratio), form hydrophober solution, hydrophober solution: pearlstone=1.4: 1 (weight ratio), mixing and stirring, drying and dehydrating reaches weight, gets hydrophobic expansion pearlite, its hydrophobicity performance is good, can be fit to needs such as air separation plant in the oxygenerator industry.Here hydrophober adopts silicone oil or is organic fatty class material.
Embodiment 4, hydrophober: water=1: 10 (weight ratio), form hydrophober solution, hydrophober solution: pearlstone=0.8: 1 (weight ratio), mixing and stirring, drying and dehydrating reaches weight, gets hydrophobic expansion pearlite, its hydrophobicity performance is good, can be fit to needs such as air separation plant in the oxygenerator industry.Here hydrophober adopts silicone oil, perhaps is organic fatty class material.
Hydrophobic expansion pearlite that above ratio is produced, the hydrophobic rate can reach 90 ~ 95%, and other index and table 2 data are basic identical.
Claims (6)
1, a kind of hydrophobic expansion pearlite is characterized in that coating hydrophober and the hydrophobic protective membrane that forms is formed by pearlstone and its surface, and this hydrophobic protective membrane material is an organic fatty class material, or oily substance.
2, hydrophobic expansion pearlite according to claim 1 is characterized in that the silicone film of hydrophobic protective membrane for adopting silicone oil to form as hydrophober.
3, a kind of preparation method of hydrophobic expansion pearlite as claimed in claim 1, it is characterized in that adopting with the hydrophober thin up, add pearlstone again and mix the operational path that stirs, hydrophober: the weight ratio of water is 1: 5 ~ 15, hydrophober solution: the weight ratio of pearlstone is 0.8-1.4: 1, mix stirring then, drying and dehydrating.
4, the preparation method of hydrophobic expansion pearlite according to claim 3 is characterized in that hydrophober adopts organic fatty class material or is oily substance.
5, the preparation method of hydrophobic expansion pearlite according to claim 3 is characterized in that hydrophober adopts silicone oil.
6, the preparation method of hydrophobic expansion pearlite according to claim 1, it is characterized in that perlite is in kiln high-temperature melting process, at the formed product position, directly evenly spray hydrophober solution by weight proportion to the pearlstone surface, drying and dewatering makes hydrophobic expansion pearlite then.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226498A (en) * | 2011-05-31 | 2011-10-26 | 上海交通大学 | Expanded perlite hydrophobic system for liquefied natural gas (LNG) carrier |
| CN101139180B (en) * | 2007-07-25 | 2012-05-30 | 宁波荣山新型材料有限公司 | Method for making polymer modified expanded perlite |
| CN102659332A (en) * | 2012-03-30 | 2012-09-12 | 陈贤进 | Preparation method of chemical vitrified perlite |
| CN104926168A (en) * | 2014-03-18 | 2015-09-23 | 连云港松彬建筑材料有限公司 | Hydrophobic expanded perlite and preparation method thereof |
| CN105948636A (en) * | 2016-04-28 | 2016-09-21 | 中晶工程材料（信阳）有限公司 | Polyacrylate enhanced modified expanded perlite thermal insulation board and production method thereof |
| CN107281782A (en) * | 2017-07-16 | 2017-10-24 | 兰州理工大学 | A kind of method of expanded perlite hydrophobically modified |
| CN108455896A (en) * | 2018-03-29 | 2018-08-28 | 广东盛达穗南环保科技有限公司 | Heat-insulation and heat-preservation filler production technology for cryogenic liquefying gas separation and Extraction system |
| CN113292297A (en) * | 2021-06-02 | 2021-08-24 | 厦门鼎固建材有限公司 | Preparation method of thermal insulation mortar for masonry |
-
2004
- 2004-05-20 CN CN 200410018499 patent/CN1579985A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139180B (en) * | 2007-07-25 | 2012-05-30 | 宁波荣山新型材料有限公司 | Method for making polymer modified expanded perlite |
| CN102226498A (en) * | 2011-05-31 | 2011-10-26 | 上海交通大学 | Expanded perlite hydrophobic system for liquefied natural gas (LNG) carrier |
| CN102226498B (en) * | 2011-05-31 | 2012-07-25 | 上海交通大学 | Expanded perlite hydrophobic system for liquefied natural gas (LNG) carrier |
| CN102659332A (en) * | 2012-03-30 | 2012-09-12 | 陈贤进 | Preparation method of chemical vitrified perlite |
| CN102659332B (en) * | 2012-03-30 | 2013-10-02 | 陈贤进 | Preparation method of chemical vitrified perlite |
| CN104926168A (en) * | 2014-03-18 | 2015-09-23 | 连云港松彬建筑材料有限公司 | Hydrophobic expanded perlite and preparation method thereof |
| CN104926168B (en) * | 2014-03-18 | 2017-08-08 | 连云港松彬建筑材料有限公司 | A kind of hydrophobic expansion pearlite and preparation method thereof |
| CN105948636A (en) * | 2016-04-28 | 2016-09-21 | 中晶工程材料（信阳）有限公司 | Polyacrylate enhanced modified expanded perlite thermal insulation board and production method thereof |
| CN107281782A (en) * | 2017-07-16 | 2017-10-24 | 兰州理工大学 | A kind of method of expanded perlite hydrophobically modified |
| CN108455896A (en) * | 2018-03-29 | 2018-08-28 | 广东盛达穗南环保科技有限公司 | Heat-insulation and heat-preservation filler production technology for cryogenic liquefying gas separation and Extraction system |
| CN113292297A (en) * | 2021-06-02 | 2021-08-24 | 厦门鼎固建材有限公司 | Preparation method of thermal insulation mortar for masonry |
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