CN1032220A - Water-flowing parts for hydraulic machine - Google Patents
Water-flowing parts for hydraulic machine Download PDFInfo
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- CN1032220A CN1032220A CN88106740A CN88106740A CN1032220A CN 1032220 A CN1032220 A CN 1032220A CN 88106740 A CN88106740 A CN 88106740A CN 88106740 A CN88106740 A CN 88106740A CN 1032220 A CN1032220 A CN 1032220A
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- epoxy resin
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- liquid rubber
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Hydraulic Turbines (AREA)
- Drying Of Semiconductors (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides hydraulic machinery, as the water power plant water turbine, the water flowing part that uses in the water pump etc., these part surfaces be coated be mixed with molecular chain-end have can with the liquid rubber of the base of epoxy resin reaction and the epoxy resin of inorganic powder.Part of the present invention has showed good anti-sand wear and gasproof erosion ability.
Description
The present invention relates to water-flowing parts for hydraulic machine, specifically, relate to hydraulic machinery, as the water power plant water turbine, the water flowing part that water pump etc. use, water flowing part of the present invention have improved anti-sand erosion and gasproof erosion ability.
The water flowing part that uses in hydraulic machinery can arrive cavitation erosion and damage, and cavitation erosion is that this depends on the geometrical shape and the water velocity of part because the surge pressure that the air pocket collapse in the current produces causes.Therefore, worked out stainless steel-based welding alloy with good gasproof erosion performance suitable material as hydraulic machinery water flowing part.The composition of this alloy is disclosed in Japanese patent application 57-152447 and 57-15689 number (open).These alloys are used for the liner and the built-up welding of described part.Also once the someone attempts to use rubber type of material, and as nylon, neoprene, polyurethane or natural rubber apply the water flowing part to prevent cavitation erosion (R.S.Sanderson:In.Tech., 30,55(1983)).
Cavitation erosion be with liquid stream in because local velocity raises thereby the decline of liquid stream static pressure forms the air pocket related phenomena.The air pocket of Xing Chenging is transported to the zone of high pressure in a short period of time and at instant failure, produces very big surge pressure with liquid stream like this, causes the damage to material.The detrimental effect of this air pocket just is called cavitation erosion.
When flow velocity was the 35-120 meter per second, air pocket collapsed the surge pressure of generation up to 514-1,745 barometric pressure.
In order to prevent this cavitation erosion, suggestion employing intensity is enough to tolerate the material of this surge pressure, perhaps can absorb the material of this surge pressure.Stainless steel-based welding alloy is above-mentioned high strength class material, and the rubber-like coating material is above-mentionedly can absorb surge pressure class material.And described resurfacing welding material is adjusted on composition to some extent so that utilize surge pressure to make the surface of water flowing part can be by flow harden.
On the other hand, when sediment charge was high in the current, described part will bear sand erosion.That is to say that described part will be subjected to hard silt composition, as Al
2O
3And SiO
2Wearing and tearing.This phenomenon is called the sand wear that the abrasive action because of solid particle in the liquid causes.In general, be higher than silt composition contained in the liquid, just can prevent this sand wear as long as make the hardness of the material of described part.If the silt content height cavitates again in the liquid stream, so above-mentioned sand wear will aggravate.
At large-scale hydraulic machinery, in water turbine,, can not provide the ability of gratifying anti-sand wear though traditional cladding material has good gasproof erosion ability.And for long-term use, these large-scale hydraulic machinerys need be done regular high temperature and repair welding, and are created in the problem of shutdown maintenance when needing length in the work on the spot.
The objective of the invention is to get rid of above-mentioned problems of the prior art, for hydraulic machinery provides the water flowing part, this water flowing part can help work on the spot aspect anti-sand wear and the gasproof erosion improvement being arranged all, reduces maintaining work.
In order to achieve the above object, the inventor has at first studied the high hardness weld metal material of covering usefulness so that improve the ability of anti-sand wear, but obtains satisfied result.The inventor finds that exceedingly increasing hardness can make material embrittlement, even therefore this method existence limitation is broken in generation.
Then, the inventor turns to research work with hardness and is higher than metal and well-known stupalith, the result that the anti-sand wear of silicon and Al-base ceramic moulded parts is tested shows, they can suffer damage hardly, the hardness of the silt particle of the impact ceramic die product that its reason is considered to carry in the water is equal to or less than pottery, thereby can not be subjected to the abrasive action of silt particle.But, all be difficult to this ceramic applications in water flowing part and use for a long time, so also there is limitation in stupalith aspect the application's the water flowing part with curvature.
In a large amount of research work to other effective ways, the inventor finds, covering the water flowing part with a kind of coating is the effective ways of realizing the object of the invention, and this coating is to mix epoxy resin composition as inorganic powders such as silica or alumina powders with high concentration.
The inventor finds, be cured being coated with on the water flowing part with above-mentioned epoxy resin composition and under specific condition, the hardness of resulting coating approaches pottery, the abrasive action that can avoid silt particle, this perhaps is because due to the inorganic powder continuous distributed in its surface, therefore, the ability of the anti-sand wear of this coating has surpassed metal.
But, the investigation of above-mentioned coating gasproof erosion ability is shown opposite with expectation, above-mentioned coating gasproof erosion ability is lower than metal widely.This is because between inorganic powder and epoxy resin a little less than the cohesive force, and the surge pressure that the air pocket collapse produces peels off inorganic powder and the result that causes.
Above-mentioned result of study enlightenment, must increase the adhesion strength between inorganic powder and the epoxy resin, make said mixture have viscoelasticity, therefore, the inventor once attempted in said mixture, being incorporated in molecular chain-end have can with the liquid rubber of the base of epoxy resin reaction, as the third composition of mixture.Mix this liquid rubber and help to reduce cavitation erosion.The present invention has promptly been made in further research based on this new discovery.
The water flowing part of using according to hydraulic machinery of the present invention is characterised in that: the surface of this part scribble mix inorganic powder and molecular chain-end have can with the epoxy resin of the liquid rubber of the base of epoxy resin reaction.
The water flowing part that above-mentioned hydraulic machinery is used comprises guide vane and the fixed guide vane in the water turbine of water power plant, the impeller that water pump is used etc.
It is believed that above-mentioned epoxy resin and have at molecular chain-end and can illustrate with following formula with the reaction mechanism of the liquid rubber (using liquid rubber to do explanation here) of the base of epoxy resin reaction with carbonyl:
Under the effect of curing agent (using pyridine here), when inducing reaction between the epoxy resin molecule, the carbonyl of CTBN carries out esterification, produces the gelatinous product with network structure.In above-mentioned course of reaction, the environment solubility in containing the system of CTBN reduces, and is precipitated out with particulate material.
This reaction product is carried out microexamination can see so-called island structure, in this structure, rubber grain exists as the island in the seawater of epoxy resin.
Therefore, not as in mixture, solid rubber is just by mechanically combination, and being connected between epoxy resin and the rubber grain has chemical soundness here.
When the particle of only being made up of epoxy resin bears pull test, shear deformation can take place in particle cause fragmentation, but when in epoxy resin, having rubber grain with the form on island, form space and many three-dimensional rimalas around rubber grain, this space and crack can absorb energy to form great failure energy (L.T.Manzione：J.Appl。Polym.Sci.，26，907（1981））。
Show in the table 1 that molecular chain has the addition and the tensile strength of the liquid rubber of carbonyl, breaks the relation between energy and the heat distortion temperature.
Table 1
Mix and curing:
Epoxy resin ON828(100 part) and
Pyridine (5 parts) mixes with liquid rubber, and mixture was solidified 16 hours under 120 ℃ temperature.
*Intensity and crack width when the table intermediate value is vertically torn according to the test specimen of central slot calculate.
As seen from Table 1, the increase of liquid rubber incorporation correspondingly makes tensile strength reduce, and elongation percentage is increased, but the most tangible failure energy that still makes excessively increases.From table 1, also it may be noted that when the liquid rubber incorporation is 15 parts (weight ratio), maximum failure energy is provided.In fact, in the ordinary course of things, the liquid rubber incorporation is about 15 parts, if but allegedly ignore hardness and heat distortion temperature, the liquid rubber incorporation can reach 200 parts.
In the present invention, further sneak into inorganic powder in mixture, as silica or alumina powder, the liquid rubber role is just complicated more like this.Though be a kind of deduction, it is believed that liquid rubber is absorbed on the interface between epoxy resin and the inorganic powder, liquid rubber strengthens the cohesive force between epoxy resin and the inorganic powder in this absorption on the interface.
The composite material of rubber or polyurethane (PU) (polyurethane) and pottery is disclosed in Japanese Unexamined Patent Publication No 62-72922 and 62-72923, this anti-wear material can replace the rich chromium cast iron or the nickel-chrome cast iron that use in the dredge pump, this dredge pump to be used for the hard sand of extracting seawater or fresh water or gravel etc.Disclosure in these two patents to the invention belongs to similar design, but wherein disclosed composite material is the mixture of solid rubber and ceramic powder, it is characterized in that wherein existing hyperbaric metal carbide, as W, C and NbC, perhaps used low-density porous ceramics, therefore, these disclosures and the present invention have basically different.
Disclose the coating of propeller pump with aluminum alloy rotary oar surface among the Japanese Unexamined Patent Publication No 62-37293, strengthened anti-cavitation erosion ability with polyamide resin, still, this coating neither contains inorganic powder, does not also contain liquid rubber.
Table 2 is depicted as the commercially available coating that prevents sand wear and cavitation erosion.The performance of these coating below will be described, and these coating are different with coating of the present invention on composition, and effect all can not be satisfactory aspect anti-sand wear and anti-cavitation erosion.
Table 2
| Sequence number | Type | Composition | Purposes |
| 1 | Polyurethane (PU) coating | Aluminium powder mixes with poly-aethylis carbamas | Ocean structure coating |
| 2 | Epoxy coating | Polyamide curing epoxy resin | Ocean structure coating |
| 3 | Be mixed with the epoxy coating of aluminium oxide | Phenolic varnish are mixed with the epoxy resin of 60% alumina powder | Anticorrosive coating |
| 4 | Be mixed with the epoxy coating of silica | Bisphenols is mixed with the epoxy resin of silica and sheet metal | Be mainly used in the corrosion protection of pump, anti-wear and anti-cavitation erosion coating |
| 5 | Di Tuo (Ditto) | Be mixed with the flexible epoxy resin of about 10% SiO 2 powder | Anti-oxygen candle coating |
The epoxy resin that uses among the present invention is preferably selected bisphenols or phenolic varnish based epoxy resin for use, and they all can have been bought on market, for example the DEN483 of the Epicoat828 of Shell chemical company production and the production of Dow chemical company.The inorganic powder that uses among the present invention preferably particle shape is crystalloid or spherical silica or alumina powder.For example can use MC-Y40(Tatsumori ﹠amp; The medium grain size that Co Co., Ltd produces is the fused silica of 8 μ m) and the medium grain size of T-61(Alcoa company production be the alumina powder of 10 μ m).The liquid rubber that uses among the present invention is that molecular chain has carboxyl or amino modified polybutadiene rubber or has the modified silicon rubber of epoxy group, and the commodity of these liquid rubbers have the Hycar CTBN 1300X13 that Ube K.K company produces and the X-22-166C of ATBN 1300X16 and Shin-etsu Kagaku company.CTBN is the abbreviation that molecular chain-end has the Polybutadiene-acrylonitrile liquid rubber of carboxyl, and ATBN is the abbreviation that molecular chain-end has amino Polybutadiene-acrylonitrile liquid rubber.
In the present invention, the ratio when mixing liquid rubber preferably liquid rubber weight accounts for 200 to 400 parts, and weight epoxy accounts for 100 parts.When the liquid rubber incorporation is lower than 20 parts of weight, just can not obtain the ability of satisfied gasproof erosion, and when surpassing 400 parts of weight, coating will be soft excessively, as shown in Figure 1, will reduce the tension bond strength when base material bears when shearing.
The proportions of ingredients of inorganic powder is a basic calculation with the mixture of epoxy resin and liquid rubber, had better not be more than the 60%(weight ratio).When the incorporation of inorganic powder surpasses the 60%(weight ratio) time, mixture just becomes sticky, and is difficult to be coated on the water flowing part.
In the present invention, key is to mix curing agent and the curing accelerator that makes mixture solidified.And the drip of mixture further improves the practicability of coating so that thixotropic nature to be provided in order to prevent to apply, and can mix a kind of coupling agent and/or fine silica particle.
The stunned declining Engel curve young pilose antler of the virtuous bank of water flowing part is scolded looks bosom mm.In order to obtain the adhesive quality good to the water flowing part, as a kind of pretreatment, part surface can carry out sand blast, to obtain the effect of set coating.
Hydraulic machinery water flowing part surface of the present invention scribble mix molecular chain-end have can with the liquid rubber of the base of epoxy resin reaction and the epoxy resin of sneaking into inorganic powder, therefore this water flowing part has very high anti-sand wear ability, this is owing to the reason of sneaking into above-mentioned inorganic powder in the mixture, also improved simultaneously anti-cavitation erosion ability, this is because the reason of having mixed above-mentioned liquid rubber, therefore, can realize purpose of the present invention well.
Below in conjunction with case description the present invention.
Table 3 is mixing formulas of example 1 to 16 and reference examples 1 to 4.Epoxy resin (Epicoat 828 and EDN438) is used as base, mix the liquid rubber (CTBN1300X13 of prearranging quatity in every kind of base, ATBN1300X16 or X22-166C), inorganic powder (EMC-Y46 or T-61), the reagent that curing agent dicyandiamide dicyandiamide(Wako Junyaku K.K. Corp. produces), a kind of derivative of curing accelerator imidazoles (2P4MHZ that Shikoku chemical industry Co., Ltd produces) and a kind of coupling agent (A-187 that Nippon Unico Co., Ltd produces).Every kind of admixture all mixes 2 hours with preparation coating with vacuum mixer.
Every kind of coating for preparing like this is coated in the surface of 20 * 30 * 3mmSUS304 test specimen, perhaps is coated in diameter 30mm, the surface of the circular SUS304 test specimen of thick 6mm, and the about 2mm of coating thickness solidified 2 hours under 120 ℃ of temperature then.After the hardness of the coating that mensuration has been solidified, carry out sand wear test and cavitation test again.Sand blast is all passed through on the test specimen surface of using in advance, and making the rugosity on surface is about 10 μ m.
The load-deflection curve that elasticity coefficient obtains during according to the compression of the moulded parts of 20 * 20 * 20mm is measured.
The sand wear test is used a kind of cement bonded sand nozzle system that contains and is carried out.Using medium grain size is the Al of 8 μ m
2O
3Powder is as the simulation silt particle.Above-mentioned Al
2O
3Powder mixes with water by the ratio of every premium on currency 30 grams, from the nozzle of 1mm diameter, under the flow velocity of 20m/s, sprays to test specimen with 45 ° of inclination angles, measures the wear extent after a hour then.
Cavitation test is used a kind of magnetostrictive oscillation formula testing machine and is carried out.One circular test specimen is fixed on the end of oscillating arms, is 6.5KHz at resonant frequency, and the test piece end peak swing is to test under the condition of 50 μ m.Erosion amount is measured after one hour in test.The hardness, sand wear amount and the cavitation erosion amount that have also shown each coating of measuring with said method in the table 3.
Comprise epoxy resin in the prescription of reference examples, or the mixture of epoxy resin and inorganic powder.As can be seen, hardness and anti-sand wear ability increase along with the increase of inorganic powder incorporation.The coating of reference examples 4 has showed the SUS304 better wear-resistant ability more commonly used than water flowing part, and in this reference examples, the sand wear amount of measuring under the same conditions is approximately 4 * 10
-3Cm
3, still, in epoxy resin, mix inorganic powder, but producing little effect aspect the anti-cavitation erosion.
On the other hand, use of the present invention containing to have the coating that can form with the mixture of the liquid rubber of the base of epoxy resin reaction at molecular chain-end, owing to viscoelasticity has cushioned the surge pressure that air pocket produces in the surge pressure that contains the silt particle current and the current, sand wear and cavitation erosion have therefore been reduced effectively.
Table 4 demonstrates sand wear amount and the cavitation erosion amount of measuring in the test that commercially available improved abrasion resistant coating (this specification is as reference examples) is carried out.Some commercially available coating wherein particularly mixes the coating of alumina powder in a large number, show the ability of goodish anti-sand wear, but the cavitation erosion amount of these coating is higher than coating of the present invention bar none.
The plotted curve of Fig. 1 shows when use contains the coating of 100 parts of epoxy resin and 60 parts of inorganic powders, is bearing under the shearing condition relation between liquid rubber incorporation and the tension bond strength.
The plotted curve of Fig. 2 shows when using the coating that contains the third composition of liquid rubber conduct except that epoxy resin and inorganic powder, the relation between liquid rubber incorporation and the sand wear amount.
Fig. 3 shows when using above-mentioned when containing liquid rubber coating, the relation between liquid rubber incorporation and the cavitation erosion amount.
Fig. 4 shows the relation between hardness/Young's modulus and the cavitation erosion amount.
Fig. 5 has used the sectional view of water power plant of the present invention with water turbine.
Result with example 1-5 and 7-11 is a fundamental measurement, and the relation between relation between liquid rubber incorporation and the sand wear amount and liquid rubber incorporation and the cavitation erosion amount is shown in Fig. 2 and Fig. 3 respectively.In plotted curve, 1 result who measures when representing inorganic powder content to be zero; 2 to represent inorganic powder content be the 20%(weight ratio) time result that measures; 3 to represent inorganic powder content be the 40%(weight ratio) time result that measures; 4 to represent inorganic powder content be the 60%(weight ratio) time result that measures.These results confirm to mix liquid rubber to alleviating sand wear and cavitation erosion, especially to alleviating cavitation erosion very high validity are arranged.
Though these physical propertys with coating of good gasproof erosion ability are difficult to clearly represent, when with reference to concerning between example 1-11 and reference examples 1-4 investigation hardness/Young's modulus and the cavitation erosion amount, can notice, therebetween existence relation as shown in Figure 4.In the plotted curve of Fig. 4, circle (zero) representative instance, triangle (△) is represented reference examples, digitized representation instance number wherein or reference examples number.Table 3 explanation for the consistency and elasticity modulus, is preferably used hard and resilient coating in order to prevent to cavitate; Table 4 explanation, the ratio of hardness/Young's modulus is high more just to be helped preventing cavitating more.
Fig. 5 uses the sectional view of water power plant of the present invention with water turbine, and the water flowing part of forming water turbine has wheel week 5, wheel cap 6, and rotor blade 7, rotating cone 8, guide vane 9, static blade 10 rotates lining 11 and liner 12.The current that flow through static blade 10 flow to rotor blade 7 along guide vane 9, make its rotation, and then flow further downstream.
These water flowing parts are made by the common metal foundry goods, require the surperficial enterprising windrow weldering of gasproof erosion ability at these water flowing parts.
Apply and make it to solidify at all available in its surface coating of the present invention of each water flowing part shown in Figure 5, to obtain the ability of good anti-sand wear and gasproof erosion.
In experiment, the parts depreciation of application example 8 coating is minimum, and example 1 coating only is subjected to mild wear, and the blade surface that applies without the coating of Formulaion of epoxy resin of the present invention then is subjected to excessive wear.
Be coated with on the surface of the water flowing part of hydraulic machinery to be mixed with to have and make the water flowing part have the ability of good anti-sand wear and gasproof erosion with the epoxy resin composition of the base of epoxy resin reaction and with the coating sclerosis and improve its work on the spot performance at molecular chain-end.Because this protective coating, can make the decline of the water flowing part time job efficient of hydraulic machinery reduce to minimum and improve its working life.
Claims (4)
1, a kind of water-flowing parts for hydraulic machine is characterized in that: the surface of this part be coated be mixed with molecular chain-end have can with the liquid rubber of the base of epoxy resin reaction and a kind of epoxy resin of inorganic powder.
2, according to the described water-flowing parts for hydraulic machine of claim 1, it is characterized in that: described liquid rubber is that molecular chain-end has the polybutadiene rubber of carboxyl or amino or the silicone rubber that molecular chain-end has epoxy group, and calculate by weight, above-mentioned liquid rubber accounts for 20 to 400 parts, and epoxy resin accounts for 100 parts.
3, according to the described water-flowing parts for hydraulic machine of claim 1, it is characterized in that: described inorganic powder is crystalline state or preparing spherical SiO 2 or aluminium oxide, and calculate by weight, above-mentioned inorganic powder account for epoxy resin and molecular chain-end have can with below 60% or 60% of mixture of the liquid rubber of the base of epoxy resin reaction.
4, according to the described water-flowing parts for hydraulic machine of claim 1, it is characterized in that: this part is the water flowing part of water power plant with water turbine.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP232050/87 | 1987-09-18 | ||
| JP62232052A JPS6476723A (en) | 1987-09-18 | 1987-09-18 | Manufacture of semiconductor device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1032220A true CN1032220A (en) | 1989-04-05 |
| CN1013607B CN1013607B (en) | 1991-08-21 |
Family
ID=16933215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN88106740A Expired CN1013607B (en) | 1987-09-18 | 1988-09-17 | Water-flowing parts for hydraulic machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS6476723A (en) |
| CN (1) | CN1013607B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801826A (en) * | 2017-04-27 | 2018-11-13 | 株式会社日立制作所 | Cavitation prediction method, cavitation prediction equipment and cavitation erosion prognostic experiment device |
| CN111117423A (en) * | 2019-12-26 | 2020-05-08 | 北京纽维逊建筑工程技术有限公司 | Elastic epoxy resin coating and preparation method thereof |
| WO2020173191A1 (en) | 2019-02-25 | 2020-09-03 | 佛山金万达科技股份有限公司 | Bio-based elastomer composition, and film and laminate prepared therefrom |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001110780A (en) * | 1999-10-07 | 2001-04-20 | Nec Corp | Method for manufacturing semiconductor device |
| JP2007059926A (en) * | 2006-09-27 | 2007-03-08 | Nec Kagoshima Ltd | Pattern-forming method and thin-film transistor manufacturing method |
-
1987
- 1987-09-18 JP JP62232052A patent/JPS6476723A/en active Pending
-
1988
- 1988-09-17 CN CN88106740A patent/CN1013607B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801826A (en) * | 2017-04-27 | 2018-11-13 | 株式会社日立制作所 | Cavitation prediction method, cavitation prediction equipment and cavitation erosion prognostic experiment device |
| WO2020173191A1 (en) | 2019-02-25 | 2020-09-03 | 佛山金万达科技股份有限公司 | Bio-based elastomer composition, and film and laminate prepared therefrom |
| CN111117423A (en) * | 2019-12-26 | 2020-05-08 | 北京纽维逊建筑工程技术有限公司 | Elastic epoxy resin coating and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6476723A (en) | 1989-03-22 |
| CN1013607B (en) | 1991-08-21 |
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