CN109385251B - Organic silicon tin compound hot-pressing sealing material for solar heat pipe vacuum heat collecting pipe and use method - Google Patents
Organic silicon tin compound hot-pressing sealing material for solar heat pipe vacuum heat collecting pipe and use method Download PDFInfo
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- CN109385251B CN109385251B CN201811084050.7A CN201811084050A CN109385251B CN 109385251 B CN109385251 B CN 109385251B CN 201811084050 A CN201811084050 A CN 201811084050A CN 109385251 B CN109385251 B CN 109385251B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
- C09J183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
- C03C27/04—Joining glass to metal by means of an interlayer
- C03C27/048—Joining glass to metal by means of an interlayer consisting of an adhesive specially adapted for that purpose
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
- C08L83/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
Abstract
The invention discloses an organic silicon tin compound hot-pressing sealing material for a solar heat pipe vacuum heat collecting pipe and a using method thereof, wherein the main chain of the organic silicon tin compound hot-pressing sealing material is a silicon-oxygen bond, the side chain is an organic tin compound, silicon and tin atoms are connected through a carbon atom chain, in the structure, R is alkyl with the carbon atom less than or equal to 6, and n is more than 1000. In the invention, the organic silicon tin compound is adopted for sealing for the first time, innovation is realized in principle, the sealing energy consumption is reduced, the yield is obviously improved, and the service life can reach more than 30 years according to the aging experiment result.
Description
Technical Field
The invention relates to the technical field of hot-press sealing of solar heat pipe vacuum heat collecting pipes, in particular to an organic silicon tin compound hot-press sealing material for a solar heat pipe vacuum heat collecting pipe and a using method thereof.
Background
Solar water heaters are currently one of the most typical technologies in the field of low temperature applications of solar energy. By the end of 2017 years, the preservation quantity of the solar water heaters in the world reaches 2.3 hundred million m2Wherein the Chinese preservation amount reaches 1.85 hundred million m2Accounting for 80% of the world, it is the country where solar heat energy is most utilized globally.
The all-glass vacuum tube water heater is the mainstream of solar water heaters in China and accounts for more than 90 percent of market share. With the development of the global solar building integration trend, the defects of easy damage, easy scaling, complex installation, difficult combination with buildings and the like of the all-glass vacuum tube water heater are exposed. At present, flat plate collectors are generally adopted in high-rise buildings, but the heat collection mode has the defect of low heat efficiency. The heat pipe type vacuum heat collecting pipe integrates the advantages of the two heat collecting modes, and has the following advantages: (1) the heat capacity is small, the starting and heat transfer are rapid, the starting can be rapidly carried out even under the low-sunlight condition of cloudy clearness, and the heat is effectively collected. Therefore, the solar cell can be effectively used even in areas with low sunshine conditions, and the application area is wide. (2) Because the heated working medium does not directly flow into the vacuum pipe, the system pipeline can bear higher working pressure (less than or equal to 6 kg/m)2) And the bearing capacity is very strong. (3) The heat pipe type heat collector has small heat loss because the selective absorption coating is coated on the outer surface of the heat pipe and the heat pipe is in vacuum heat insulation. (4) Heat transfer by heat pipesThe vacuum tube has no water, and the heat tube has the anti-freezing and anti-overheating performance, so that the high temperature problem of the heat collector under the no-load condition and the freezing and frost cracking problem of the heat collector in a severe cold area are prevented. (5) Simple installation, the operation is reliable: the heat absorber and the heat collector are in dry connection, so that the problem of hot water leakage is avoided, and the installation is convenient; even if one heat pipe has a problem, the normal use of the whole system cannot be influenced in the maintenance process. Therefore, the heat pipe type vacuum heat collecting pipe has good development prospect.
However, the heat pipe type vacuum heat collecting pipe has certain technical problems in the sealing process of the glass and the iron-nickel expansion alloy end cover. The traditional glass-metal material sealing method generally adopts a flame sealing method to seal the sealed glass and the iron-nickel expansion alloy end cover together by melting, the sealing method requires that the expansion coefficients of the sealed glass and the iron-nickel expansion alloy end cover are very matched, the mutual difference is less than 6 percent, otherwise, the air tightness is poor, the glass tube after being sealed by melting needs to be carefully annealed to eliminate the thermal stress in the glass caused by the sealing by melting, and the process has the advantages of complex process, high energy consumption and poor repeatability. Therefore, in recent years, the industry has adopted a hot-press sealing process to perform press sealing (related patent publications CN1076180A, CN1223978A, and CN 1262248A). The principle of sealing is to utilize the diffusion of atoms to make metal atoms in the solder diffuse into the sealed iron-nickel expansion alloy end cover and glass, thereby realizing atomic-scale sealing.
The currently used solders comprise Pb, Al and Cu, and in the prior patent (201310179593.8), Mg, Be, V, Co and Ni are used as sealing materials, so that good effects are achieved. However, these materials are limited to inorganic elemental metal materials.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an organic silicon tin compound hot-pressing sealing material for a solar heat pipe vacuum heat collecting pipe and a using method thereof.
According to the disclosed embodiment, the invention discloses an organic silicon tin compound hot-pressing sealing material for a solar heat pipe vacuum heat collecting pipe, which has the following molecular structure,
wherein, the main chain is a silicon-oxygen bond, the side chain is an organic tin group, silicon and tin atoms are linked through a carbon atom, in the structure, R is alkyl with the carbon atom less than or equal to 6, and n is more than 1000.
Further, R is methyl.
According to the disclosed embodiment, the second aspect of the invention discloses a use method of an organic silicon tin compound hot-pressing sealing material for a solar heat pipe vacuum heat collecting pipe, which comprises the following steps:
s1, dissolving the organic silicon tin compound hot-pressing sealing material in an organic solvent to obtain a solution;
s2, coating the solution on glass, and naturally drying;
s3, butting the metal kovar on the glass coated with the organic silicon stannide hot-pressing sealing material to obtain a sealing piece;
s4, heating the sealing piece to 150 ℃ and 200 ℃, and simultaneously applying 5-10kg/cm2The impact pressure of the sealing is used for sealing.
Further, the organic solvent is any one of ethanol, acetone, ethyl acetate or butyl acetate.
Compared with the prior art, the invention has the following advantages and effects:
compared with the hot-pressing sealing method using a common metal simple substance as a sealing material, the invention initiates an organic metal material compound to realize sealing, which is not reported in the prior literatures and patents. The organosilicon compound has a very low vapor pressure and therefore has very good sealing properties.
After the branch chain is linked with the organic tin group, the good wetting property of the organic tin group is utilized, so that the good wetting with metal can be realized, and the sealing is realized. Because the sealed metal kovar mainly comprises the stainless steel alloy containing nickel, and Fe atoms in the stainless steel alloy are electrons on the outer layerIs 4S2Orbital electrons, and the outermost layer of tin atoms is also 4S2Therefore, the wettability of the metal tin compound and the metal is good.
It is known that since glass contains silicate as a main component and a large amount of silicon, the wettability between a sealing material and glass can be improved by selecting organosilicon as a main chain.
The organic silicon tin compound has excellent weather resistance and can prolong the service life of the sealing part.
Another advantage of the present invention is that the temperature and pressure of the thermocompression seal can be reduced. The current sealing is carried out at a temperature of 300 ℃ and 700 ℃ and under a pressure of 70-500 kg/cm2(ZL 201310179593.8), and the sealing temperature only needs 150 ℃ and 200 ℃ by adopting the novel material of the patent, and the pressure can be reduced to 5-10kg/cm2The energy consumption is greatly reduced, and the finished product rate is obviously improved.
Drawings
FIG. 1 is a schematic view of a heat pipe evacuated collector tube sealed using the materials and methods of the present invention;
wherein, 1, kovar metal, 2, organic silicon stannide, 3 and glass.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The embodiment discloses a using method of an organic silicon tin compound hot-pressing sealing material for a solar heat pipe vacuum heat collecting pipe, which comprises the following steps:
dissolving the organic silicon tin compound hot-pressing sealing material in ethanol to obtain a solution; coating the solution on glass, and naturally drying; butt-jointing metal kovar on the surface of coated organic silicon tinHot-pressing the sealing material on glass to obtain a sealing piece; the seal was heated to 150 ℃ while applying 5kg/cm2The impact pressure of the sealing is used for sealing. In this example, R is methyl and n is about 1500. The obtained sealing surface has air leakage rate less than 1 × 10-12Torr. L/sec, meeting the sealing requirement. The test yield is 99 percent and is superior to the current yield of 95 percent.
Example two
The embodiment discloses a use method of an organic silicon tin compound hot-pressing sealing material for a solar heat pipe vacuum heat collecting pipe, which comprises the following steps:
dissolving the organic silicon tin compound hot-pressing sealing material in ethanol to obtain a solution; coating the solution on glass, and naturally drying; butt-jointing metal kovar on glass coated with the organic silicon stannide hot-pressing sealing material to obtain a sealing piece; the seal was heated to 200 ℃ while applying 10kg/cm2The impact pressure of the sealing is used for sealing. In this example, R is hexyl and n is about 15000. The obtained sealing surface has air leakage rate less than 1 × 10-12Torr. L/sec, meeting the sealing requirement. The test yield is 99 percent and is superior to the current yield of 95 percent.
In conclusion, based on the findings in the research, the organic silicon stannide can realize good sealing between metal and glass, the sealing conditions are milder, the sealing temperature and pressure are greatly reduced, and the method is favorable for realizing energy conservation and improving the yield. In the invention, the organic silicon tin compound is adopted for sealing for the first time, innovation is realized in principle, the sealing energy consumption is reduced, the yield is obviously improved, and the service life can reach more than 30 years according to the aging experiment result.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (3)
1. A use method of an organic silicon tin compound hot-pressing sealing material for a solar heat pipe vacuum heat collecting pipe is characterized by comprising the following steps:
s1, dissolving the organic silicon tin compound hot-pressing sealing material in an organic solvent to obtain a solution;
s2, coating the solution on glass, and naturally drying;
s3, butting the metal kovar on the glass coated with the organic silicon stannide hot-pressing sealing material to obtain a sealing piece;
s4, heating the sealing piece to 150 ℃ and 200 ℃, and simultaneously applying 5-10kg/cm2The sealing is finished by the impact pressure;
wherein the organic silicon tin compound hot-pressing sealing material has the following molecular structure,
wherein, the main chain is a silicon-oxygen bond, the side chain is an organic tin group, silicon and tin atoms are linked through a carbon atom, in the structure, R is alkyl with the carbon atom less than or equal to 6, and n is more than 1000.
2. The use method of the organic silicon tin compound hot-pressing sealing material for the solar heat pipe vacuum heat collecting pipe as claimed in claim 1, wherein R is methyl.
3. The use method of the organic silicon tin compound hot-pressing sealing material for the solar heat pipe vacuum heat collecting pipe as claimed in claim 1, wherein the organic solvent is one of ethanol, acetone, ethyl acetate or butyl acetate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811084050.7A CN109385251B (en) | 2018-09-18 | 2018-09-18 | Organic silicon tin compound hot-pressing sealing material for solar heat pipe vacuum heat collecting pipe and use method |
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| CN201811084050.7A CN109385251B (en) | 2018-09-18 | 2018-09-18 | Organic silicon tin compound hot-pressing sealing material for solar heat pipe vacuum heat collecting pipe and use method |
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| CN109385251B true CN109385251B (en) | 2021-03-19 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6330501A (en) * | 1986-07-23 | 1988-02-09 | Nichiden Kagaku Kk | Production of modified starch |
| CN1304344A (en) * | 1999-03-16 | 2001-07-18 | 日本板硝子株式会社 | Leadless solder |
| CN103265187A (en) * | 2013-05-15 | 2013-08-28 | 中国科学院广州能源研究所 | Glass-metal heat sealing material and method of heat-pipe evacuated solar collector tube |
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2018
- 2018-09-18 CN CN201811084050.7A patent/CN109385251B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6330501A (en) * | 1986-07-23 | 1988-02-09 | Nichiden Kagaku Kk | Production of modified starch |
| CN1304344A (en) * | 1999-03-16 | 2001-07-18 | 日本板硝子株式会社 | Leadless solder |
| CN103265187A (en) * | 2013-05-15 | 2013-08-28 | 中国科学院广州能源研究所 | Glass-metal heat sealing material and method of heat-pipe evacuated solar collector tube |
Non-Patent Citations (1)
| Title |
|---|
| Organopolysiloxanes Containing Group IV Organometallic Substituents in the Side Chains;DIETMAR SEYFERTH et al.;《JOURNAL OF POLYMER SCIENCE》;19551231;第543-558页 * |
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